金井 理 (カナイ サトシ)

情報科学研究院 システム情報科学部門 システム創成学分野特任教授
Last Updated :2024/12/04

■研究者基本情報

学位

  • 工学博士, 北海道大学

Researchmap個人ページ

研究者番号

  • 90194878

研究キーワード

  • 大規模環境3次元レーザ計測
  • 形状モデリング
  • 設計システム
  • デジタルエンジニアリング
  • CAD
  • Geometric Modeling
  • Design System
  • Digital Engineering
  • CAD

研究分野

  • 社会基盤(土木・建築・防災), 安全工学
  • 社会基盤(土木・建築・防災), 社会システム工学
  • ライフサイエンス, 生体材料学
  • ライフサイエンス, 生体医工学
  • ものづくり技術(機械・電気電子・化学工学), 加工学、生産工学
  • ものづくり技術(機械・電気電子・化学工学), 機械要素、トライボロジー
  • ものづくり技術(機械・電気電子・化学工学), 設計工学

■経歴

経歴

  • 2023年04月 - 現在
    北海道大学 大学院情報科学研究院, システム情報科学部門, 特任教授
  • 2019年04月 - 2023年03月
    北海道大学 大学院情報科学研究院, システム情報科学部門, 教授, 日本国
  • 2007年04月 - 2019年03月
    北海道大学, 大学院情報科学研究科 システム情報科学専攻, 教授
  • 2003年04月 - 2007年03月
    北海道大学 大学院情報科学研究科, システム情報科学専攻, 助教授
  • 1997年 - 2003年
    北海道大学 大学院工学研究科 システム情報工学専攻 助教授, Graduate School of Engineering
  • 1995年 - 1997年
    北海道大学 工学部 精密工学科 助教授, School of Engineering
  • 1989年 - 1996年
    東京工業大学 工学部 機械科学科 助教授, School of Engineering, Dept. of Mechanical Engineering and Science
  • 1987年 - 1989年
    北海道大学工学部 精密工学科 助手, School of Engineering

学歴

  • 1987年, 北海道大学, 工学研究科, 精密工学専攻, 日本国
  • 1987年, 北海道大学, Graduate School, Division of Engineering, Division of Precision Engineering
  • 1984年, 北海道大学, 工学研究科, 精密工学専攻, 日本国
  • 1984年, 北海道大学, Graduate School, Division of Engineering, Division of Precision Engineering
  • 1982年, 北海道大学, 工学部, 精密工学科, 日本国
  • 1982年, 北海道大学, Faculty of Engineering, Department of Precision Engineering

委員歴

  • 2020年10月 - 現在
    18th annual International CAD Conference, Paper Co-Chair, その他
  • 2020年03月 - 現在
    (公社) 精密工学会, 理事, 学協会
  • 2019年02月 - 現在
    (公社) 精密工学会, 北海道支部 商議員, 学協会
  • 2018年05月 - 現在
    International Journal of Automation Technology (Fuji Technology Press), Editorial Board, その他
  • 2017年04月 - 現在
    (一社)北海道産学官研究フォーラム, 理事, その他
  • 2017年04月 - 現在
    (公社)日本設計工学会北海道支部, 商議員・支部幹事, 学協会
  • 2014年07月 - 現在
    (一社)北海道産学官研究フォーラム 産官学CIM・GIS研究会, 副座長, その他
  • 2013年10月 - 現在
    Journal of Computational Design and Engineering (Oxford Academic), Editorial Board, その他
  • 2013年02月 - 現在
    (公社)精密工学会 大規模環境の3次元計測と認識・モデル化技術専門委員会, 委員, 学協会
  • 2007年04月 - 現在
    International Journal on Interactive Design and Manufacturing (Springer), Executive Scientific Board, 学協会
  • 2019年11月 - 2020年06月
    17th annual International CAD Conference, Paper Co-Chair
  • 2017年01月 - 2018年12月
    (独)日本学術振興会 科学研究費委員会, 専門委員, 学協会
  • 2014年12月 - 2016年11月
    (独)日本学術振興会 科学研究費委員会, 専門委員, 学協会
  • 2013年06月 - 2014年05月
    精密工学会, 北海道支部 支部長, 学協会
  • 2013年05月 - 2013年12月
    International Journal of Automation Technology (Fuji Technology Press), Guest editor for a special issue “CAD/CAM/Digital Engineering”, 学協会
  • 2011年09月 - 2013年09月
    International Journal of CAD/CAM (Society of CAD/CAM Engineers), Editor-in-Chief, 学協会
  • 2013年03月 - 2013年08月
    2013 Asian Conference on Design and Digital Engineering, Workshop Co-Chair of Emergent applications of CAD, その他
  • 2012年06月 - 2013年05月
    精密工学会, 北海道支部 副支部長, 学協会
  • 2012年02月 - 2013年01月
    精密工学会 大規模環境の3次元計測と認識・モデル化技術専門委員会, 委員長, 学協会
  • 2012年03月 - 2012年12月
    2012 Asian Conference on Design and Digital Engineering, Workshop Co-Chair of Emergent applications of CAD, その他
  • 2009年04月 - 2011年03月
    精密工学会, サイバーフィールド構築技術研究分科会 主査, 学協会
  • 2009年10月 - 2010年10月
    IDMME - Virtual Concept 2010, Invited workshop Chair of Product Design for the Future, その他
  • 2008年04月 - 2009年03月
    International Journal on Interactive Design and Manufacturing (Springer), Guest editor for a special issue “Advanced prototyping for human-centered design for information appliances”, その他
  • 2008年 - 2009年
    精密工学会, 評議員, 学協会
  • 2008年
    日本機械学会, 設計工学・システム部門 企画活動活性化委員会 委員, 学協会
  • 2007年
    精密工学会, 2007秋季全国大会実行委員会プログラム委員会幹事, 学協会
  • 2004年 - 2006年
    精密工学会, 事業部会 デジタルスタイルデザイン研究分科会 幹事, 学協会
  • 2005年
    日本機械学会, 設計工学・システム部門運営委員, 学協会
  • 2002年 - 2004年
    日本機械学会, 生産システム部門運営委員, 学協会
  • 2004年
    精密工学会, 現物融合型エンジニアリング専門委員会 委員, 学協会
  • 1998年 - 2002年
    精密工学会, メガポリゴン産学協同研究分科会委員, 学協会
  • 1997年 - 1999年
    日本機械学会, FA部門部門委員<99>, 学協会

■研究活動情報

受賞

  • 2022年06月, 19th Annual International CAD Conference, CAD'22 Bset Paper Award               
    Preliminary Shape Similarity Analysis and Standardization for Pre-Bent Rod Design for Adult Spinal Deformity Correction
    A. Soutome;S. Kanai;H. Date;H. Sudo;T. Kokabu;Y. Abe;H. Moridaira;H. Taneichi
  • 2020年04月, 文部科学省, 令和2年度科学技術分野の文部科学大臣表彰 科学技術賞(研究部門)               
    脊柱変形疾患に対する革新的医療機器の開発と実用化研究
    須藤英毅(北海道大学) 金井理(北海道大学) 千葉晶彦(東北大学)
  • 2019年11月, ICCBEI 2019 Scientific Committee, Best Paper Award Honorable Mentioned               
    Automatic indoor environment modeling from laser-scanned point clouds using graph-based regular arrangement recognition
    Hayato Takahashi;Hiroaki Date;Satoshi Kanai
  • 2019年06月, 16th Annual International CAD Conference, Best Paper Award               
    Free-form Feature Classification for Finite Element Meshing based on Shape Descriptors and Machine Learning
    Ippei Takaishi;Satoshi Kanai;Hiroaki Date;Hideyoshi Takashima
  • 2018年11月, 精密工学会, Best Paper Award of 17th International Conference on Precision Engineering               
    3D Asymmetry Analysis of Human's Back Surface for Early Screening of Idiopathic Scoliosis
    Kanai Satoshi;Hideki Sudo;Terufumi Kokabu;Hiroshi Nagaeda;Takayuki Hayashi;Hajime Ohta
  • 2018年07月, 15th Annual International CAD Conference, Best Paper Award               
    Cylinder-based Efficient and Robust Registration and Model Fitting of Laser-scanned Point Clouds for As-built Modeling of Piping Systems
    Ryota Moritani;Satoshi Kanai;Hiroaki Date;Masahiro Watanabe;Takahiro Nanano;Yuta Yamauchi
  • 2015年04月, 2nd International Conference on Civil and Building Engineering Informatics, Best Paper Award               
    Optimal setup of a terrestrial laser scanner for capturing piping objects in plants
    Satoshi Kanai;Shinya Yamanishi;Hiroaki Date
  • 2014年07月, 精密工学会, Best Paper Award of 15th International Conference on Precision Engineering               
    MR-based 3D prototyping for information appliances using random dot markers and fingernail color detection
    Satoshi Kanai;Hiroaki Date;Jiabin Guan
  • 2014年04月, Digital Human Modeling Symposium 2014, Best Research Award               
    Efficient Large-Scale as-Built Environment Modeling Based on 3D Laser-Scanning for Human Walking Simulation
    Tsubasa Maruyama;Satoshi Kanai;Hiroaki Date
  • 2014年02月, Society of CAD/CAM Engineers, Gaheon Award               
    An Efficient Simulation of Skin Contact Deformation for Virtual Ergonomic Assessments of Handheld Products
    Yulai Xie;Satoshi Kanai;Hiroaki Date
  • 2013年03月, 精密工学会, 2012年度 精密工学会論文賞               
    「大規模環境レーザ計測点群からの配管系統の自動認識」
    川島千明;金井理;伊達宏昭
  • 2012年12月, Asian Conference on Design and Digital Engineering 2012, ベストペーパー賞               
    Robust and Exhaustive Symmetry Detection from Scanned Meshes
    溝口知広;金井理;伊達宏昭;田中大之
  • 2010年03月, 精密工学会, 2009年度 精密工学会論文賞               
    ICPとリージョングローイングを組み合わせた機械部品計測メッシュのユークリッド対称性認識手法
    溝口知広;金井 理, 日本国
  • 2008年, Symposium Co-Organizer 貢献賞               
    金井 理
  • 2008年, ASME, Symposium Co-Organizer Award               
  • 2007年05月, 日本設計工学会, The most interesting reading 賞               
    デジタルエンジニアリングによる工業デザインプロセスの支援とその課題
    金井 理, 日本国
  • 2006年, Honor Article賞               
  • 2002年, 第20回設計シンポジウム,設計シンポジウム賞               
    日本国
  • 2000年, Best Paper Award - Innovative Applications/Practice               

論文

  • Ceiling Equipment Extraction from TLS Point Clouds for Reflected Ceiling Plan Creation
    Riho Akiyama, Hiroaki Date, Satoshi Kanai, Kazushige Yasutake
    International Journal of Automation Technology, 2024年09月05日
    研究論文(学術雑誌)
  • 人工呼吸器装着中の気管内吸引トレーニングが可能なシミュレータSimmar+ESTE-SIMの開発
    コリー 紀代, 五十嵐 真里, 小水内 俊介, 井上 創造, 中村 美鈴, 金井 理, 近野 敦, 二宮 伸治
    小児保健研究, 83, 講演集, 152, 152, (公社)日本小児保健協会, 2024年05月
    日本語
  • Development of Notch-Free, Pre-Bent Rod Applicable for Posterior Corrective Surgery of Thoracolumbar/Lumbar Adolescent Idiopathic Scoliosis.
    Yoko Ishikawa, Satoshi Kanai, Katsuro Ura, Terufumi Kokabu, Katsuhisa Yamada, Yuichiro Abe, Hiroyuki Tachi, Hisataka Suzuki, Takashi Ohnishi, Tsutomu Endo, Daisuke Ukeba, Masahiko Takahata, Norimasa Iwasaki, Hideki Sudo
    Journal of clinical medicine, 12, 17, 2023年09月04日, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌), Adolescent idiopathic scoliosis (AIS), the most common pediatric musculoskeletal disorder, causes a three-dimensional spine deformity. Lenke type 5 AIS is defined as a structural thoracolumbar/lumbar curve with nonstructural thoracic curves. Although a rod curvature will affect clinical outcomes, intraoperative contouring of the straight rod depends on the surgeon's knowledge and experience. This study aimed to determine the optimum rod geometries to provide a pre-bent rod system for posterior spinal surgery in patients with Lenke type 5 AIS. These pre-bent rods will be beneficial for achieving proper postoperative outcomes without rod contouring based on surgeon experience. We investigated 20 rod geometries traced in posterior spinal reconstruction in patients with Lenke type 5 AIS. The differences between the center point clouds in each cluster were evaluated using the iterative closest point (ICP) method with modification. Before the evaluation using the ICP method, the point clouds were divided into four clusters based on the rod length using a hierarchical cluster analysis. Because the differences in the values derived from the ICP method were <5 mm for each length-based cluster, four representative rod shapes were generated from the length-based clusters. We identified four optimized rod shapes that will reduce operation time, leading to a decreased patient and surgeon burden.
  • Footprint Detection of Ceiling Equipment from TLS Point Clouds               
    Riho Akiyama, Hiroaki Date, Satoshi Kanai, Kazushige Yasutake
    Proceedings of the 5th International Conference on Civil and Building Engineering Informatics, 465, 470, 2023年07月20日, [査読有り]
    研究論文(国際会議プロシーディングス)
  • Graph Neural Network-Based Finite Element Feature Recognition from B-rep Model
    Ryosuke Moriya, Satoshi Kanai, Hiroaki Date, Hideyoshi Takashima, Tetsufumi Taichi
    Proceedings of CAD'23, 254, 259, CAD Solutions LLC, 2023年07月12日, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • Graph Neural Network-Based Finite Element Feature Recognition from B-rep Model               
    Ryosuke Moriya, Satoshi Kanai, Hiroaki Date, Hideyoshi Takashima, Tetsufumi Taichi
    Computer-Aided Design and Applications, 掲載決定, CAD Solutions LLC, 2023年06月20日, [査読有り]
    英語, 研究論文(学術雑誌)
  • Proficiency evaluation of simulation education on the entire tracheal suctioning process using a motion capture system and a catheter control sensing device
    Noriyo Colley, Shunsuke Komizunai, Satoshi Kanai, Atsushi Konno, Sozo Inoue, Misuzu Nakamura, Shinji Ninomiya
    Journal of International Nursing Research, 2, 1, e2021, 0016, Japan Society of Nursing Research, 2023年02月17日, [査読有り]
    英語, 研究論文(学術雑誌)
  • Preliminary Shape Similarity Analysis and Standardization for Pre-Bent Rod Design for Adult Spinal Deformity Correction
    Ayane Soutome, Satoshi Kanai, Hiroaki Date, Terufumi Kokabu, Yuichiro Abe, Hiroshi Moridaira, Hiroshi Taneichi, Hideki Sudo
    Computer-Aided Design and Applications, 20, 5, 797, 813, 2023年01月18日, [査読有り]
    英語, 研究論文(学術雑誌)
  • MMS取得点群からの道路面における領域・線状型損傷のベクトルデータ抽出
    本間 亮平, 伊達 宏昭, 金井 理
    精密工学会誌, 89, 8, 654, 660, 公益社団法人 精密工学会, 2023年08月05日, [査読有り]
    日本語, 研究論文(学術雑誌), It is important to accurately inspect road pavement conditions for maintaining the safety and comfort of drivers. In recent years, Mobile Mapping System (MMS) mounted with a laser scanner has been widely used and pavement defect extraction using MMS point clouds is expected. This paper presents an extraction method of region-type defects such as rutting and potholes and line-type defects such as cracks of pavement surfaces using point clouds acquired by a Mobile Mapping System. The features of the proposed method compared with related works are the ability to extract displacements of the region and line-type defects using a single framework and the ability to extract defects with different scales and complex geometries. The proposed method first estimates an ideal pavement surface based on smooth curve fitting to scanlines using an index that represents the impact level of defects at each point. Then, vector data of region and line-type defects are extracted using displacements from the ideal pavement surface at each point. In the experiments, the proposed method achieved an IoU (Intersection over Union) of 80.2% for extracted regions and ground truth of region-type defects, and a recall of 90.7%, a precision of 97.0%, and an RMS of 10.0mm by Heipke's proposed method in the extraction of line-type defects.
  • Error ellipsoidal model estimation for TLS point clouds and its application to point cloud registration               
    S. Yokomori, H. Date, S. Kanai, Y. Moribe
    Proceedings of the 19th international conference on precision engineering (ICPE2022), C240, 2022年11月30日, [査読有り]
    研究論文(国際会議プロシーディングス)
  • Efficient and Precise Approximated Object Model Generation for Optimal View Planning in Structure-from-motion and Multi-view-stereo
    Genki YOSHIDA, Satoshi KANAI, Hiroaki DATE
    Proceedings of 19th International Conference on Precision Engineering (ICPE 2022), C175, 2022年11月30日, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), 36070419
  • Personally Adapted Human Body Model Generation Based on 3D Body Scanning, Mesh Morphing, and Statistical Shape Model               
    A. Sotome, S. Kanai, H. Date, Y. Endo
    Proceedings of the 19th international conference on precision engineering (ICPE2022), P15, 2022年11月29日, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • Feature Recognition from B-rep Models for Finite Element Meshing using Graph Neural Network               
    Ryosuke MORIYA, Satoshi KANAI, Hiroaki DATE, Tetsufumi TAICHI, Hideyoshi TAKASHIMA
    Proceedings of 19th International Conference on Precision Engineering (ICPE2022), C282, 2022年11月29日, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • Deep-Learning-Based Three-Dimensional Detection of Individual Wave-Dissipating Blocks from As-Built Point Clouds Measured by UAV Photogrammetry and Multibeam Echo-Sounder
    Yajun Xu, Satoshi Kanai, Hiroaki Date, Tomoaki Sano
    REMOTE SENSING, 14, 21, 5575, MDPI, 2022年11月, [査読有り]
    英語, 研究論文(学術雑誌), Wave-dissipating blocks are the armor elements of breakwaters that protect beaches, ports, and harbors from erosion by waves. Monitoring the poses of individual wave-dissipating blocks benefits the accuracy of the block supplemental work plan, recording of the construction status, and monitoring of long-term pose change in blocks. This study proposes a deep-learning-based approach to detect individual blocks from large-scale three-dimensional point clouds measured with a pile of wave-dissipating blocks placed overseas and underseas using UAV photogrammetry and a multibeam echo-sounder. The approach comprises three main steps. First, the instance segmentation using our originally designed deep convolutional neural network partitions an original point cloud into small subsets of points, each corresponding to an individual block. Then, the block-wise 6D pose is estimated using a three-dimensional feature descriptor, point cloud registration, and CAD models of blocks. Finally, the type of each segmented block is identified using model registration results. The results of the instance segmentation on real-world and synthetic point cloud data achieved 70-90% precision and 50-76% recall with an intersection of union threshold of 0.5. The pose estimation results on synthetic data achieved 83-95% precision and 77-95% recall under strict pose criteria. The average block-wise displacement error was 30 mm, and the rotation error was less than 2 degrees. The pose estimation results on real-world data showed that the fitting error between the reconstructed scene and the scene point cloud ranged between 30 and 50 mm, which is below 2% of the detected block size. The accuracy in the block-type classification on real-world point clouds reached about 95%. These block detection performances demonstrate the effectiveness of our approach.
  • Shape Similarity Analysis and Standardization for Pre-bent Rod Design for Spinal Deformity Correction
    Ayane Soutme, Satoshi Kanai, Hiroaki Date, Terufumi Kokabu, Yuichiro Abe, Hiroshi Moridaira, Hiroshi Taneichi
    CAD'22 Proceedings, 209, 214, CAD Solutions LLC, 2022年06月08日, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • MIXED REALITY VISUALIZATION OF POINT CLOUDS FOR SUPPORTING TERRESTRIAL LASER SCANNING
    K. Ohno, H. Date, S. Kanai
    The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, XLIII-B2-2022, 251, 258, Copernicus GmbH, 2022年05月30日, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), Abstract. 3D point clouds from terrestrial laser scanners (TLS) are used in a variety of fields and applications. To acquire high-quality point clouds that have enough point density, small scanning errors, and no lack of points in important regions, appropriate scan planning, including determination of scanner positions and scan conditions, is required. Currently, planning is supported by knowledge and experience of skilled workers, and it is difficult to ensure the quality of acquired point clouds. In this study, we propose a system for visualization of point clouds to support the acquisition of high-quality point clouds using TLS. The system allows the user to see and check the quality of scanned TLS point clouds and unscanned regions intuitively by superimposing the point clouds onto the real world using a mixed reality (MR) device. In addition, the system supports finding the next best scanner position for additional laser scans based on predicted scan quality visualization to acquire higher-quality points or fill the unscanned regions.
  • プロジェクションマッピングシミュレータ教育におけるモーションキャプチャを用いた看護技術評価
    コリー 紀代, 小水内 俊介, 金井 理, 近野 敦, 井上 創造, 中村 美鈴, 二宮 伸治
    高等教育ジャーナル : 高等教育と生涯学習, 29, 61, 67, 北海道大学高等教育推進機構高等教育研究部, 2022年03月
    日本語
  • Recognition of Free-form Features for Finite Element Meshing using Deep Learning
    Hideyoshi Takashima, Satoshi Kanai
    Computer-Aided Design and Applications, 19, 4, 677, 693, CAD Solutions, LLC, 2022年07月, [査読有り], [最終著者]
    英語, 研究論文(学術雑誌), Finite element (FE) models used in large-scale vehicle simulations are usually composed of high-quality FE meshes that comply with in-house meshing specifications. The meshing patterns, location, and resolution are strictly defined for specific free-form features, such as ribs and bosses, in the specifications. However, finding such free-form features on the given computer-aided design (CAD) models requires a great deal of manual operation. This study proposes a deep-learning (DL) approach to recognize free-form features on CAD models for the automatic generation of FE models to address this issue. This approach allows training a deep neural network on point clouds with reasonable recognition accuracy using a dataset with a large variety of free-form feature shapes represented by the point cloud. The dataset is generated from parametric CAD modeling. It classifies the types of the free-form feature shapes on an input product model and label local feature areas on them. The proposed free-form feature recognition method was experimentally verified using two types of complicated product models. First, models where multiple free-form feature shapes are located independently. Second, where multiple feature shapes are smoothly connected and interacted. The labeling verification showed excellent automatic identification of the feature locations and local feature areas on free-form feature shapes. These results suggest that the proposed DL approach for free-form feature recognition effectively generates FE models.
  • Quantification of Cartilage Surface Degeneration by Curvature Analysis Using 3D Scanning in a Rabbit Model.
    Dawei Liang, Tomohiro Onodera, Masanari Hamasaki, Ryosuke Hishimura, Kentaro Homan, Liang Xu, Yuan Tian, Satoshi Kanai, Norimasa Iwasaki
    Cartilage, 13, 2_suppl, 19476035211059597, 19476035211059597, 2021年11月20日, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌), OBJECTIVE: Accurate analysis to quantify cartilage morphology is critical for evaluating degenerative conditions in osteoarthritis (OA). Three-dimensional (3D) optical scanning provides 3D data for the entire cartilage surface; however, there is no consensus on how to quantify it. Our purpose was to validate a 3D method for evaluating spatiotemporal alterations in degenerative cartilages in a rabbit OA model by analyzing their curvatures at various stages of progression. DESIGN: Twelve rabbits underwent anterior cruciate ligament transection (ACLT) unilaterally and were divided into 4 groups: 4 weeks control, 4 weeks OA, 8 weeks control, and 8 weeks OA. 3D scanning, India ink staining, and histological assessments were performed in all groups. In 3D curvature visualization, the surfaces of the condyles were divided into 8 areas. The standard deviations (SD) of mean curvatures from all vertices of condylar surfaces and subareas were calculated. RESULTS: Regarding the site of OA change, curvature analysis was consistent with India ink scoring. The SD of mean curvature correlated strongly with the India ink Osteoarthritis Research Society International (OARSI) score. In curvature histograms, the curvature distribution in OA was more scattered than in control. Of the 8 areas, significant OA progression in the posterolateral part of the lateral condyle (L-PL) was observed at 4 weeks. The histology result was consistent with the 3D evaluation in terms of representative section. CONCLUSIONS: This study demonstrated that 3D scanning with curvature analysis can quantify the severity of cartilage degeneration objectively. Furthermore, the L-PL was found to be the initial area where OA degeneration occurred in the rabbit ACLT model.
  • 仮想生体反応の呈示・実施者の属性による気管吸引中の視線計測結果と作業負担感への影響
    コリー 紀代, 小水内 俊介, 金井 理, 井上 創造, 近野 敦, 中村 美鈴, 二宮 伸治
    人工呼吸, 38, 2, 162, 168, (一社)日本呼吸療法医学会, 2021年11月
    日本語, 【目的】本研究では、(1)プロジェクションマッピング映像による仮想生体反応の呈示の有無や実施者の属性にかかわらず、視線計測結果が習熟度評価指標となりうるかを検証し、(2)生体反応を呈するシミュレータを用いた際の作業負担感を初学者と熟練者において比較することを目的とする。【方法】看護師群と学生群の気管吸引の所要時間、視線の停留時間・停留回数を測定した。タスク終了後に日本語版NASA-TLXを用い、両群の作業負担感を比較した。【結果】生体反応呈示の有無と属性による交互作用は認められず、所要時間と視線停留時間において看護師群-学生群間の主効果が認められた。作業負担感は26項目中5項目に有意差が認められた。【結論】看護師群の視線停留時間が統計学的有意に短く、習熟度評価に有用な指標と考えられた。作業負担感は生体反応の呈示により学生群・看護師群ともに高まり、先行研究よりも有意差のある項目数が減少した。(著者抄録)
  • Recognition of Free-form Features for Finite Element Meshing using Deep Learning               
    Hideyoshi Takashima, Satoshi Kanai
    Proceedings of CAD’21, 31, 35, 2021年07月, [査読有り], [最終著者]
    英語, 研究論文(国際会議プロシーディングス)
  • An algorithm for using deep learning convolutional neural networks with three dimensional depth sensor imaging in scoliosis detection.
    Terufumi Kokabu, Satoshi Kanai, Noriaki Kawakami, Koki Uno, Toshiaki Kotani, Teppei Suzuki, Hiroyuki Tachi, Yuichiro Abe, Norimasa Iwasaki, Hideki Sudo
    The spine journal : official journal of the North American Spine Society, 21, 6, 980, 987, 2021年06月, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌), BACKGROUND CONTEXT: Timely intervention in growing individuals, such as brace treatment, relies on early detection of adolescent idiopathic scoliosis (AIS). To this end, several screening methods have been implemented. However, these methods have limitations in predicting the Cobb angle. PURPOSE: This study aimed to evaluate the performance of a three-dimensional depth sensor imaging system with a deep learning algorithm, in predicting the Cobb angle in AIS. STUDY DESIGN: Retrospective analysis of prospectively collected, consecutive, nonrandomized series of patients at five scoliosis centers in Japan. PATIENT SAMPLE: One hundred and-sixty human subjects suspected to have AIS were included. OUTCOME MEASURES: Patient demographics, radiographic measurements, and predicted Cobb angle derived from the deep learning algorithm were the outcome measures for this study. METHODS: One hundred and sixty data files were shuffled into five datasets with 32 data files at random (dataset 1, 2, 3, 4, and 5) and five-fold cross validation was performed. The relationships between the actual and predicted Cobb angles were calculated using Pearson's correlation coefficient analyses. The prediction performances of the network models were evaluated using mean absolute error and root mean square error between the actual and predicted Cobb angles. The shuffling into five datasets and five-fold cross validation was conducted ten times. There were no study-specific biases related to conflicts of interest. RESULTS: The correlation between the actual and the mean predicted Cobb angles was 0.91. The mean absolute error and root mean square error were 4.0° and 5.4°, respectively. The accuracy of the mean predicted Cobb angle was 94% for identifying a Cobb angle of ≥10° and 89% for that of ≥20°. CONCLUSIONS: The three-dimensional depth sensor imaging system with its newly innovated convolutional neural network for regression is objective and has significant ability to predict the Cobb angle in children and adolescents. This system is expected to be used for screening scoliosis in clinics or physical examination at schools.
  • 視線移動量と視線移動速度頻度分析による気管内吸引技術の習熟度評価の検討               
    横尾 さくら, コリー 紀代, 小水内 俊介, 近野 敦, 金井 理, 二宮 伸治
    医工学治療, 33, Suppl., 169, 169, (NPO)日本医工学治療学会, 2021年05月
    日本語
  • スキャンラインの湾曲度評価に基づくMMS取得点群からの車道境界線抽出
    本間 亮平, 伊達 宏昭, 金井 理
    写真測量とリモートセンシング, 60, 2, 53, 64, 日本写真測量学会, 2021年05月, [査読有り], [最終著者]
    日本語, 研究論文(学術雑誌)
  • Multi-view stereo reconstruction technique for weakly-textured surfaces               
    Kei Akutsu, Satoshi Kanai, Hiroaki Date
    Proceedings of the 10th International Conference on Bridge Maintenance, Safety and Management (IABMAS 2020), 2021年04月, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • 気管内吸引手技の2D/3D動画視聴による学習効果評価指標の開発
    萬谷 麗奈, コリー 紀代, 小水内 俊介, 近野 敦, 金井 理, 浅賀 忠義, 中村 美鈴, 井上 創造, 萬井 太規, 二宮 伸治
    医工学治療, 33, 1, 21, 29, (NPO)日本医工学治療学会, 2021年03月, [査読有り]
    日本語, 研究論文(学術雑誌), 気管内吸引は侵襲を伴うため、医学生・看護学生を含め、免許取得前の医療系学生が実施する機会は限られている。そのため、患者や療養者のケアを行う家族ケア提供者も含め、より多くの人間が気管内吸引手技を獲得する一助となるよう、Two Dimensional(2D)動画とThree Dimensional Computer Graphics(3DCG)動画を開発した。本研究の目的は、一般的な気管内吸引の2D動画と、2D動画をもとに製作した3DCGアニメーション動画を看護師と看護学生に視覚呈示し、視線の停留点移動速度と観察結果を問うアンケートを実施により、停留点移動速度の学習効果評価項目指標としての適用可能性を検討することを目的とした。動画視聴中の看護師と学生の視線を両眼構成の視線計測システムにて記録・分析した結果、看護師群と学生群ともに2D/3Dいずれの動画視聴においても停留点移動速度頻度分析における両群間の統計学的有意差は認められなかったものの、共通して二峰性のグラフを示した。アンケート結果からは両群ともに動画視聴による学習効果について肯定的な意見が大部分を占めた。今後は、操作方法や3D動画中の説明の追加などの意見を踏まえて動画を改良した上で、停留点移動速度頻度分析による学習効果への影響を測定することが課題である。(著者抄録)
  • Direct Generation of Cartesian Grid for As-built CFD Analysis from Laser-scanned Point Clouds
    Tetsuro Ishikawa, Satoshi Kanai, Hiroaki Date
    Computer-Aided Design and Applications, 18, 6, 1341, 1358, CAD Solutions, LLC, 2021年02月26日, [査読有り], [責任著者]
    英語, 研究論文(学術雑誌)
  • Shape Descriptor-Based Similar Feature Extraction for Finite Element Meshing
    Hideyoshi Takashima, Satoshi Kanai
    Computer-Aided Design and Applications, 18, 5, 1080, 1095, CAD Solutions, LLC, 2021年01月07日, [査読有り], [最終著者]
    英語, 研究論文(学術雑誌)
  • 気管内吸引,体位変換および経管栄養の訓練が可能な生体反応を呈する看護教育シミュレータ
    小水内 俊介, コリー 紀代, 二宮 伸治, 金井 理, 近野 敦
    ロボティクス・メカトロニクス講演会講演概要集, 2021, 2A1-E06, 一般社団法人 日本機械学会, 2021年
    日本語, This paper describes a functional expansion of a nursing education simulator that has been developed focusing on the endotracheal suctioning. Most patients who require endotracheal suctioning also require tube feeding. In addition to sputum aspiration and repositioning, by providing training functions for tube feeding, educational elements of the nursing simulator, such as the relationship between tasks, and the vital reactions to the procedures, are expanded.
  • Study on Real-Time Point Cloud Superimposition on Camera Image to Assist Environmental Three-Dimensional Laser Scanning.
    Kenta Ohno, Hiroaki Date, Satoshi Kanai
    International Journal of Automation Technology, 15, 3, 324, 333, FUJI TECHNOLOGY PRESS LTD, 2021年, [査読有り], [最終著者]
    英語, 研究論文(学術雑誌), Recently, three-dimensional (3D) laser scanning technology using terrestrial laser scanner (TLS) has been widely used in the fields of plant manufacturing, civil engineering and construction, and surveying. It is desirable for the operator to be able to immediately and intuitively confirm the scanned point cloud to reduce unscanned regions and acquire scanned point clouds of high quality. Therefore, in this study, we developed a method to superimpose the point cloud on the actual environment to assist environmental 3D laser measurements, allowing the operator to check the scanned point cloud or unscanned regions in real time using the camera image. The method included extracting the correspondences of the camera image and the image generated by point clouds by considering unscanned regions, estimating the camera position and attitude in the point cloud by sampling correspondence points, and superimposing the scanned point cloud and unscanned regions on the camera image. When the proposed method was applied to two types of environments, that is, a boiler room and university office, the estimated camera image had a mean position error of approximately 150 mm and mean attitude error of approximately 1 degrees, while the scanned point cloud and unscanned regions were superimposed on the camera image on a tablet PC at a rate of approximately 1 fps.
  • Construction of a detachable artificial trachea model for three age groups for use in an endotracheal suctioning training environment simulator.
    Takaaki Yoshimura, Noriyo Colley, Shunsuke Komizunai, Shinji Ninomiya, Satoshi Kanai, Atsushi Konno, Koichi Yasuda, Hiroshi Taguchi, Takayuki Hashimoto, Shinichi Shimizu
    PloS one, 16, 3, e0249010, PUBLIC LIBRARY SCIENCE, 2021年, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌), Tracheal suctioning is an important procedure to maintain airway patency by removing secretions. Today, suctioning operators include not only medical staff, but also family caregivers. The use of a simulation system has been noted to be the most effective way to learn the tracheal suctioning technique for operators. While the size of the trachea varies across different age groups, the artificial trachea model in the simulation system has only one fixed model. Thus, this study aimed to construct multiple removable trachea models according to different age groups. We enrolled 20 patients who had previously received proton beam therapy in our institution and acquired the treatment planning computed tomography (CT) image data. To construct the artificial trachea model for three age groups (children, adolescents and young adults, and adults), we analyzed the three-dimensional coordinates of the entire trachea, tracheal carina, and the end of the main bronchus. We also analyzed the diameter of the trachea and main bronchus. Finally, we evaluated the accuracy of the model by analyzing the difference between the constructed model and actual measurements. The trachea model was 8 cm long for children and 12 cm for adolescents and young adults, and for adults. The angle between the trachea and bed was about 20 degrees, regardless of age. The mean model accuracy was less than 0.4 cm. We constructed detachable artificial trachea models for three age groups for implementation in the endotracheal suctioning training environment simulator (ESTE-SIM) based on the treatment planning CT image. Our constructed artificial trachea models will be able to provide a simulation environment for various age groups in the ESTE-SIM.
  • Simple Textured Polygon Model Generation from Multiple TLS Point Clouds               
    Shinichiro Imai, Hiroaki Date, Satoshi Kanai, Yoshinori Moribe, Masaki Nakamura
    Proceedings of the 18th International Conference on Precision Engineering (ICPE2020), 2020年11月, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • Precise Denoising of 3D Point Clouds with Awareness of Point-Wise Measuring Quality               
    Kohei Tsubooka, Satoshi Kanai, Hiroaki Date, Tatsuo Hariyama, Masahiro Watanabe
    Proceedings of the 18th International Conference on Precision Engineering (ICPE2020), 2020年11月, [査読有り], [責任著者]
    英語, 研究論文(国際会議プロシーディングス)
  • Streamlining Photogrammetry-based 3D Modeling of Construction Sites using a Smartphone, Cloud Service and Best-view Guidance
    Ryota Moritani, Satoshi Kanai, Kei Akutsu, Kiyotaka Suda, Abdalrahman Elshafey, Nao Urushidate, Mitsuru Nishikawa
    Proceedings of the 37th International Symposium on Automation and Robotics in Construction (ISARC), International Association for Automation and Robotics in Construction (IAARC), 2020年10月14日, [査読有り], [責任著者]
    英語, 研究論文(国際会議プロシーディングス)
  • EXTRACTION OF ROAD EDGES FROM MLS POINT CLOUDS USING BEND ANGLE OF SCANLINES
    R. Honma, H. Date, S. Kanai
    ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, XLIII-B2-2020, 1091, 1097, Copernicus GmbH, 2020年08月14日, [査読有り]
    英語, 研究論文(学術雑誌), Abstract. Efficient road edge extraction from point clouds acquired by Mobile Laser Scanning (MLS) is an important task because the road edge is one of the main elements of high definition maps. In this paper, we present a scanline-based road edge extraction method using a bend angle of scanlines from MLS point clouds. Scanline-based methods have advantages in that computational cost is low, it is easy to extract accurate road edges, and they are independent of driving speed of MLS compared to methods using unorganized points. In contrast, there are some problems with these methods where the extraction accuracy becomes low at curb cuts and intersections. The extraction accuracy becomes low caused by the scanning noise and small occlusion from weeds and fallen leaves. In addition, some parameters should be adjusted according to the mounting angle of the laser scanner on the vehicle. Therefore, we present a scanline-based road edge extraction method which can solve these problems. First, the points of the scanline are projected to a plane in order to reduce the influence of the mounting angle of the laser scanner on the vehicle. Next, the bend angle of each point is calculated by using filtered point clouds which are not vulnerable to small occlusions around the curb such as weeds. Then, points with a local maximum of bend angle and close to trajectories are extracted as seed points. Finally, road edges are generated by tracking based on bend angle of scanlines and smoothness of road edges from the seed points. In the experiments, our proposed methods achieved a completeness of over 95.3%, a correctness of over 95.0%, a quality of over 90.7%, and RMS difference less than 18.7 mm in total.
  • PLAUSIBLE RECONSTRUCTION OF AN APPROXIMATED MESH MODEL FOR NEXT-BEST VIEW PLANNING OF SFM-MVS
    R. Moritani, S. Kanai, H. Date, Y. Niina, R. Honma
    ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, XLIII-B2-2020, 465, 471, Copernicus GmbH, 2020年08月12日, [査読有り]
    英語, 研究論文(学術雑誌), Abstract. Structure-from-Motion (SfM) and Multi-View Stereo (MVS) are widely used methods in three dimensional (3D) model reconstruction for an infrastructure maintenance purpose. However, if a set of images is not captured from well-placed positions, the final dense model can contain low-quality regions. Since MVS requires a much longer processing time than SfM as larger amounts of images are provided, it is impossible for surveyors to wait for the SfM–MVS process to complete and evaluate the geometric quality of a final dense model on-site. This challenge results in response inefficiency and the deterioration of dense models in 3D model reconstruction. If the quality of the final dense model can be predicted immediately after SfM, it will be possible to revalidate the images much earlier and to obtain the dense model with better quality than the existing SfM–MVS process. Therefore, we propose a method for reconstructing a more plausible 3D mesh model that accurately approximates the geometry of the final dense model only from sparse point clouds generated from SfM. This approximated mesh model can be generated using Delaunay triangulation for the sparse point clouds and triangle as well as tetrahedron filtering. The approximated model can be used to predict the geometric quality of the final dense model and for an optimization-based view planning. Some experimental results showed that our method is effective in predicting the quality of the final dense model and finding the potentially degraded regions. Moreover, it was confirmed that the average reconstruction errors of the dense model generated by the optimization-based view planning went below tens of millimeters and falls within an acceptable range for an infrastructure maintenance purpose.
  • DETECTION OF INDOOR ATTACHED EQUIPMENT FROM TLS POINT CLOUDS USING PLANAR REGION BOUNDARY
    H. Takahashi, H. Date, S. Kanai, K. Yasutake
    ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, XLIII-B2-2020, 495, 500, Copernicus GmbH, 2020年08月12日, [査読有り]
    英語, 研究論文(学術雑誌), Abstract. Laser scanning technology is useful to create accurate three-dimensional models of indoor environments for applications such as maintenance, inspection, renovation, and simulations. In this paper, a detection method of indoor attached equipment such as windows, lightings, and fire alarms, from TLS point clouds, is proposed. In order to make the method robust against to the lack of points of equipment surface, a footprint of the equipment is used for detection, because the entire or a part of the footprint boundary shapes explicitly appear as the boundary of base surfaces, i.e. walls for windows, and ceilings for lightings and fire alarms. In the method, first, base surface regions are extracted from given TLS point clouds of indoor environments. Then, footprint boundary points are detected from the region boundary points. Finally, target equipment is detected by fitting or voting using given target footprint shapes. The features of our method are footprint boundary point extraction considering occlusions, shape fitting with adaptive parameters based on point intervals, and robust shape detection by voting from multiple footprint boundary candidates. The effectiveness of the proposed method is evaluated using TLS point clouds.
  • 吸引の3Dアニメーション視聴中の仮想的なカメラによる視線の軌道と視点の変化の測定(Measurement of eye-trajectory and viewpoint change by a virtual camera during three-dimensional animation of suctioning)               
    Colley Noriyo, Taira Yuya, Komizunai Shunsuke, Ninomiya Shinji, Kanai Satoshi, Konno Atsushi, Mani Hiroki, Asaka Tadayoshi, Inoue Sozo, Nakamura Misuzu
    医学教育, 51, Suppl., 78, 78, (一社)日本医学教育学会, 2020年07月
    英語
  • 生体反応を持つシミュレーターでの器官吸引に関する視線追跡を用いた分析(Eye-tracking Analysis of Tracheal Suctioning on a Simulator with Vital Reactions)               
    Colley Noriyo, Umesawa Sarina, Ninomiya Shinji, Komizunai Shunsuke, Kanai Satoshi, Konno Atsushi, Mani Hiroki, Asaka Tadayoshi, Inoue Sozo, Nakamura Misuzu
    医学教育, 51, Suppl., 78, 78, (一社)日本医学教育学会, 2020年07月
    英語
  • Shape Descriptor-based Similar Feature Extraction for Finite Element Meshing
    Hideyoshi Takashima, Satoshi Kanai
    CAD'20, CAD Solutions LLC, 2020年05月25日, [査読有り], [最終著者]
    英語, 研究論文(国際会議プロシーディングス)
  • Direct Generation of Cartesian Grid for As-built CFD Analysis from Laser Scanned Point Clouds
    Tetsuro Ishikawa, Satoshi Kanai, Hiroaki Date
    CAD'20, CAD Solutions LLC, 2020年05月25日, [査読有り]
    研究論文(国際会議プロシーディングス)
  • Free-Form Feature Classification for Finite Element Meshing based on Shape Descriptors and Machine Learning
    Ippei Takashi, Satoshi Kanai, Hiroaki Date, Hideyoshi Takashima
    Computer-Aided Design and Applications, 17, 2020年01月07日, [査読有り]
    研究論文(学術雑誌)
  • Relationship Between Tracheal Suctioning Catheter Motion and Secretion Amount Based on Viscosity
    Noriyo Colley, Shunsuke Komizunai, Atsushi Konno, Satoshi Kanai, Shinji Ninomiya
    SAGE Open Nursing, 6, 237796082096938, 237796082096938, SAGE Publications, 2020年01月, [査読有り]
    英語, 研究論文(学術雑誌), Background To provide safe tracheal suctioning, the American Association of Respiratory Care guideline discusses the length of suctioning catheter, but the most effective tracheal suctioning catheter technique is still unknown.

    Objective The aim of this study is to compare the amount of simulated secretion produced by five different handlings of a catheter at two different viscosities and in two different models to discover the most effective suctioning maneuver in the various mucus conditions.

    Design In vitro experimental design.

    Methods The amount of secretion aspirated by our researcher's manipulation of a suctioning catheter was measured. The tip of the catheter was recorded using a high-speed video camera to visualize the secretion motion.

    Results The most effective suctioning technique differed depending on the viscosity of the secretion. There were no significant differences between five suctioning methods applied to high-viscosity phlegm in a tracheal membrane model, but the flexion technique was the most efficient for low-viscosity secretion.

    Conclusions Our results imply that the flexion technique was reasonably safe and the most effective of these five methods for low-viscosity secretion.

  • 気管内吸引技術における動作分析を用いた習熟度評価の検討 前屈姿勢、手背移動、停留、NASA-TLXを指標として
    長内 真理乃, コリー 紀代, 小水内 俊介, 二宮 伸治, 金井 理, 浅賀 忠義, 中村 美鈴, 井上 創造, 村田 恵理, 萬井 太規, 近野 敦
    日本小児呼吸器学会雑誌, 30, 2, 172, 180, 日本小児呼吸器学会, 2020年01月, [査読有り]
    日本語, 気管内吸引は、気管や気管支粘膜などの損傷や損傷に伴う大量出血、低酸素症、嘔吐、疼痛といったリスクがあり侵襲度が高い技術であるとされる。より実践的な指導により免許取得後の安全な吸引を実施するためにも、客観的な数値や尺度による評価が必要になるが、気管内吸引技術の習熟度を示す指標を検討している先行研究は多くはない。そこで本研究はモーションキャプチャを用い、気管内吸引シミュレーション中の看護師群と看護学生群の習熟度の評価指標や教育項目を検討した。また、NASA-TLXを用いて精神的負担感を調査した。動作解析より、所要時間、左手背総移動距離、左右の手背の停留回数・停留時間について群間に有意差が認められ、NASA-TLXの結果からは学生群の方が時間の余裕のなさや作業結果への不満足というストレスが大きいことが示された。従って、これらが気管内吸引の習熟度の客観的評価項目として有用である可能性が示唆された。(著者抄録)
  • 気管内吸引手技中の視線計測による看護師と看護学生の習熟度の比較
    竹内 由佳, コリー 紀代, 二宮 伸治, 小水内 俊介, 金井 理, 浅賀 忠義, 中村 美鈴, 井上 創造, 村田 恵理, 萬井 太規, 近野 敦
    医工学治療, 31, 3, 171, 180, (NPO)日本医工学治療学会, 2019年11月, [査読有り]
    日本語, 本研究では視線計測に基づく教育評価項目や評価指標の抽出を目的とし、気管内吸引シミュレーション中の看護師と看護学生を対象に両眼構成視線計測装置(Pupil、Pupil Labs社)を用いた視線計測により手技の所要時間、視線の停留回数・停留時間、停留点移動速度を比較した。視線計測後には、NASA-TLXを用いて作業負担度を調査した。その結果、所要時間、視線の停留時間、視線の停留回数・停留時間に有意差が認められた。作業負担度には有意差が見られなかったことから、両群とも模擬環境において同等のストレスがあったと推測される。不慣れな環境においてもパフォーマンスに差が現れることから、手技の所要時間や視線の停留回数・停留時間は習熟度を評価する客観的な指標となりうることが示された。(著者抄録)
  • Automatic Indoor Environment Modeling from Laser-scanned Point Clouds using Graph-based Regular Arrangement Recognition               
    Hayato Takahashi, Hiroaki Date, Satoshi Kanai
    Proceedings of the 4th International Conference on Civil and Building Engineering Informatics, 368, 375, 2019年11月, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • Segmentation and LOD model generation of buildings from MMS point clouds of urban area               
    Takuya Kanayana, Toshihide Mineushiro, Hiroaki Date, Satoshi Kanai
    精密工学会誌, 85, 10, 912, 918, 2019年10月, [査読有り]
    英語, 研究論文(学術雑誌)
  • 一人称視点で模範手技の追体験が可能な没入型看護教育システム ESTE-VR
    小水内 俊介, 近野 敦, 金井 理, 浅賀 忠義, 井上 創造, 村田 恵理, 萬井 太規, 高橋 望, 二宮 伸治, コリー 紀代
    日本シミュレーション医療教育学会雑誌, 7, 89, 93, 日本シミュレーション医療教育学会, 2019年08月
    日本語, 【背景】在宅医療の浸透に伴い、医師や看護師ではない範囲も含め、一定水準の看護教育を受けたケア提供者を増やすことは重要な課題となる。【目的】気管内吸引を例に、手技の習熟を支援する体験型の看護教育システムを開発する。【方法】気管内吸引中の実施者の全身動作および視線を計測する。仮想現実(Virtual reality:VR)空間で人型モデルに計測データを反映することで手技の再現・観察を可能とする。【結果】学習者が模範手技を一人称視点で追体験することが可能であるとともに、指導者が学習者の手技を自由な視点から観察し定量的に分析・評価するための手段にもなる。【考察】手取り足取りの指導を使用者自身の模倣で代替することにより、言語化しにくいコツや巧みさの伝達を支援しうる。(著者抄録)
  • 吸引カテーテル操作に応じた生体反応を呈するプロジェクションマッピングシミュレータ ESTE-SIM
    小水内 俊介, コリー 紀代, 近野 敦, 金井 理, 浅賀 忠義, 高橋 望, 二宮 伸治
    日本シミュレーション医療教育学会雑誌, 7, 118, 119, 日本シミュレーション医療教育学会, 2019年08月
    日本語
  • 一人称視点で熟練者の身体動作と視線を追体験可能な没入型看護教育システム ESTE-VR               
    小水内 俊介, コリー 紀代, 近野 敦, 金井 理, 浅賀 忠義, 井上 創造, 村田 恵理, 萬井 太規, 高橋 望, 二宮 伸治
    日本シミュレーション医療教育学会雑誌, 7, 118, 118, 日本シミュレーション医療教育学会, 2019年08月
    日本語
  • 一人称視点で模範手技の追体験が可能な没入型看護教育システム ESTE-VR
    小水内 俊介, 近野 敦, 金井 理, 浅賀 忠義, 井上 創造, 村田 恵理, 萬井 太規, 高橋 望, 二宮 伸治, コリー 紀代
    日本シミュレーション医療教育学会雑誌, 7, 89, 93, 日本シミュレーション医療教育学会, 2019年08月
    日本語, 【背景】在宅医療の浸透に伴い、医師や看護師ではない範囲も含め、一定水準の看護教育を受けたケア提供者を増やすことは重要な課題となる。【目的】気管内吸引を例に、手技の習熟を支援する体験型の看護教育システムを開発する。【方法】気管内吸引中の実施者の全身動作および視線を計測する。仮想現実(Virtual reality:VR)空間で人型モデルに計測データを反映することで手技の再現・観察を可能とする。【結果】学習者が模範手技を一人称視点で追体験することが可能であるとともに、指導者が学習者の手技を自由な視点から観察し定量的に分析・評価するための手段にもなる。【考察】手取り足取りの指導を使用者自身の模倣で代替することにより、言語化しにくいコツや巧みさの伝達を支援しうる。(著者抄録)
  • LS POINT CLOUD REGISTRATION BASED ON ICP ALGORITHM USING POINT QUALITY               
    H. Date, E. Wakisaka, Y. Moribe, S. Kanai
    Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-2, W13, 963, 968, 2019年06月, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • MLS POINT CLOUD SEGMENTATION BASED ON FEATURE POINTS OF SCANLINES               
    R. Honma, H. Date, S. Kanai
    Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-2, W13, 1007, 1013, 2019年06月, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • QUALITY PREDICTION OF DENSE POINTS GENERATED BY STRUCTURE FROM MOTION FOR HIGH-QUALITY AND EFFICIENT AS-IS MODEL RECONSTRUCTION               
    R. Moritani, S. Kanai, H. Date, Y. Niina, R. Honma
    nt. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-2, W13, 95, 101, 2019年06月, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • Free-form Feature Classification for Finite Element Meshing based on Shape Descriptors and Machine Learning               
    Ippei Takaishi, Satoshi Kanai, Hiroaki Date, Hideyoshi Takashima
    Proc. 16th Annual International CAD Conference, 414, 419, 2019年06月, [査読有り]
    英語, 研究論文(学術雑誌)
  • Optimal Laser Scan Planning for As-Built Modeling of Plant Renovations Using Mathematical Programming               
    Eisuke Wakisaka, Satoshi Kanai, Hiroaki Date
    Proceedings of 2019 International Symposium on Automation and Robotics in Construction, 91, 98, 2019年05月, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • 3D非対称性解析を用いた側弯症検出システムにおける同一被検者に対する再現性
    小甲晃史, 須藤英毅, 金井理, 安倍雄一郎, 岩崎倫政
    Journal of Spine Research, 10, 3, 164, 2019年03月25日
    日本語
  • 4D‐FEAシミュレーションによる術前計画と積層造形技術を含む脊柱変形矯正用カスタムメイドロッドの開発
    須藤英毅, 金井理, 小甲晃史, 青柳健太, 王昊, 安倍雄一郎, 岩崎倫政, 千葉晶彦
    Journal of Spine Research, 10, 3, 434, 2019年03月25日
    日本語
  • Generating facial expressions of pain with projection mapping for the nurse training simulator (1st report)—Effect on the tracheal aspiration time for a patient with cerebral palsy
    Fauzi Ahmad Ridwan, 金井 理, 伊達 宏昭, 小水内 俊介, 近野 敦, コリー 紀代, 二宮 伸治
    精密工学会学術講演会講演論文集, 2019S, 860, 861, 公益社団法人 精密工学会, 2019年03月01日
    英語, Patients with cerebral palsy suffer from permanent movement disorder, and a nurse usually performs their tracheal aspiration where a tube must be inserted into the patient’s trachea. The tube insertion procedure must be performed quickly and carefully in order for the patient not to experience significant pain, anxiety, and even tracheal bleeding that would cause fear for the patient. To master such skill, many training opportunities should be provided for the novice nurses. Therefore, a training simulator is needed that could mimic the real situation of the procedure to provide an accurate and realistic feedback to the novice nurses. To realize that goal, we have developed a simulator that provides a head mannequin with the pain sensor attached and can project computer-generated patient’s facial expressions onto the mannequin face using projection mapping. The expression can change in conjunction with pain intensity the patient would receive due to the sputum blockage in the trachea and due to the hard contact of the tube tip with the trachea. The effectiveness of the projection mapping in the simulator is evaluated by comparing how fast trained and novice nurses finish the procedure when the facial expression of the pain is simulated or not.
  • Quantitative analysis of regional endocardial geometry dynamics from 4D cardiac CT images: endocardial tracking based on the iterative closest point with an integrated scale estimation.
    Kazuya Kobayashi, Satoru Wakasa, Koji Sato, Satoshi Kanai, Hiroaki Date, Satomi Kimura, Noriko Oyama-Manabe, Yoshiro Matsui
    Physics in medicine and biology, 64, 5, 055009, 055009, 2019年02月25日, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌), Regional cardiac function analysis is important for the diagnosis and treatment planning of ischemic heart disease, but has not been sufficiently developed in the field of computed tomography (CT). Therefore, we propose a 3D endocardial tracking framework for cardiac CT using local point cloud registration based on the iterative closest point with an integrated scale estimation algorithm. We also introduce regional function descriptors that express the curvature and stretching of the endocardium: Surface distortion (E) and Scaling rate (S). For a region-to-region comparison, we propose endocardial segmentation according to coronary perfusion territories defined by the Voronoi partition based on coronary distribution. Our study of 65 endocardial segments in ten subjects showed that global endocardial deformation has a positive relationship with the stroke volume index (r  =  0.896 and 0.829 in [Formula: see text] and [Formula: see text], respectively) and ejection fraction (r  =  0.804 and 0.835), and a positive relationship with the brain natriuretic peptide level (r  =  0.690 and 0.776). A positive relationship between segmental E and S (r  =  0.845), a higher value of E in ischemic segments (p   =  0.021) that are determined by fractional flow reserve estimated from coronary CT data, and a higher value of S in the left circumflex artery territory (p   <  0.05) were also observed. The required radiation dose was 5.0  ±  0.7 mSv and the computation time was 7.2  ±  1.1 min. The result suggests that proposed endocardial deformation analysis using CT can be conducted on site and in time for the acute setting, and may be useful for the diagnosis of cardiac dysfunction or myocardial ischemia.
  • 鋳造品の迅速リバースエンジニアリングに関する研究 ‐鋳肌面と機械加工面の分離に基づく面属性付きの整形ソリッドモデルの生成‐
    浦田昇尚, 伊達宏昭, 金井理, 後藤孝行, 安田星季
    精密工学会誌(Web), 85, 3, 267‐273(J‐STAGE), 2019年
    日本語
  • An Interactive Endotracheal Suctioning Simulator Which Exhibits Vital Reactions: ESTE-SIM.
    Shunsuke Komizunai, Shinji Ninomiya, Atsushi Konno, Satoshi Kanai, Tadayoshi Asaka, Eri Murata, Hiroki Mani, Nozomi Takahashi, Noriyo Colley
    IJAT, 13, 4, 490, 498, 2019年, [査読有り]
    研究論文(学術雑誌)
  • Automated noninvasive detection of idiopathic scoliosis in children and adolescents: A principle validation study.
    Sudo H, Kokabu T, Abe Y, Iwata A, Yamada K, Ito YM, Iwasaki N, Kanai S
    Scientific reports, 8, 1, 17714, 17714, NATURE PUBLISHING GROUP, 2018年12月07日, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌), Idiopathic scoliosis is the most common pediatric musculoskeletal disorder that causes a three-dimensional deformity of the spine. Early detection of this progressive aliment is essential. The aim of this study is to determine outcomes using a newly developed automated asymmetry-evaluation system for the surface of the human back using a three-dimensional depth sensor. Seventy-six human subjects suspected to have idiopathic scoliosis were included in this study. Outcome measures include patient demographics, radiographic measurements, and asymmetry indexes defined in the automated asymmetry-recognition system. The mean time from scanning to analysis was 1.5 seconds. For predicting idiopathic scoliosis of greater than 25°, the area under the curve was 0.96, sensitivity was 0.97, and specificity was 0.88. The coefficient of variation for repeatability analyses using phantom models was 1-4%. The intraclass correlation coefficient obtained for intra-observer repeatability for human subjects was 0.995. The system three-dimensionally scans multiple points on the back, enabling an automated evaluation of the back's asymmetry in a few seconds. This study demonstrated discriminative ability in determining whether an examinee requires an additional x-ray to confirm diagnosis.
  • Optimal Laser Scan Planning of Terrestrial Laser Scanner for As-built Modeling of HVAC Systems using Integer Programming               
    Eisuke Wakisaka, Satoshi Kanai, Hiroaki Date
    International Conference on Precision Engineering (ICPE2018), 2018年11月, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • 3D Asymmetry Analysis of Human’s Back Surface for Early Screening of Idiopathic Scoliosis               
    Satoshi Kanai, Hideki Sudo, Terufumi Kokabu, Hiroshi Nagaeda, Takayuki Hayashi, Hajime Ohta
    International Conference on Precision Engineering (ICPE2018), D-5-2, 2018年11月, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • Cylinder-based Efficient and Robust Registration and Model Fitting of Laser-scanned Point Clouds for As-built Modeling of Piping Systems
    Ryota Moritani, Satoshi Kanai, Hiroaki Date, Masahiro Watanabe, Takahiro Nakano, Yuta Yamauchi
    Computer-Aided Design and Applications, 16, 3, 396, 412, {CAD} Solutions, {LLC}, 2018年09月29日, [査読有り]
    英語, 研究論文(学術雑誌)
  • Cylinder-based simultaneous registration and model fitting of laser-scanned point clouds for accurate as-built modeling of piping system
    Ryota Moritani, Satoshi Kanai, Hiroaki Date, Masahiro Watanabe, Takahiro Nakano, Yuta Yamauchi
    Computer-Aided Design and Applications, 15, 5, 720, 733, Taylor and Francis Inc., 2018年09月03日, [査読有り]
    英語, 研究論文(学術雑誌), In this study, a novel algorithm for cylinder-based registration and model fitting of laser-scanned point clouds was proposed. The algorithm was designed specifically for as-built modeling of a plant piping system. In contrast with Iterative Closest Point (ICP)-based methods, fine registration and model fitting were performed simultaneously, by solving a single nonlinear constraint equation. This prevented alignment error arising in registration from propagating to model fitting. Coarse registration was automated by identifying cylindrical surfaces and by finding matches among their cylinder axes using a random sample consensus (RANSAC) method. The accuracy and robustness of the proposed algorithm was first confirmed using scan simulations. It performed well even when there was zero overlap between scans, and was demonstrated to achieve better modeling accuracy than ICP-based methods. The algorithm was then applied to point clouds scanned from a real plant, with successful results. The proposed algorithm achieves as-built modeling accuracies that would be fully acceptable when conducting renovation work on existing piping systems.
  • 空調設備のas-builtモデル構築のための地上型レーザスキャナの最適配置計画
    脇坂 英佑, 金井 理, 伊達 宏昭
    精密工学会誌, 84, 8, 738, 745, 公益社団法人 精密工学会, 2018年08月, [査読有り]
    日本語, 研究論文(学術雑誌), 3D laser scanners have recently been introduced for efficient as-built modeling in the heating, ventilating and air conditioning (HVAC) industry. Given their highly complex installation, when scanning the piping objects in HVAC systems using a terrestrial laser scanner (TLS), it is difficult to manually determine feasible scanner placement to capture the object areas required for renovation work at high accuracy and quality without occlusion. We propose an algorithm for a model-based optimum scan planning method for a TLS. This method uses a coarse 3D model generated by structure-from-motion, and finds optimal scanner placement that satisfies visibility, scan range, incident angle, and scan quality constraints. In this study, the optimal scanner placement problem is formulated as a 0-1 integer programming problem that is solved using the branch and bound method. In addition, a GPU significantly increases the speed of the precomputation of visibility constraints. In an evaluation, the proposed algorithm outperformed our previously proposed greedy method in terms of the number of scans and scan coverage ratio, and it shows performance equal to the greedy method in terms of modeling quality.</p>
  • Identification of optimized rod shapes to guide anatomical spinal reconstruction for adolescent thoracic idiopathic scoliosis.
    Kokabu T, Kanai S, Abe Y, Iwasaki N, Sudo H
    Journal of orthopaedic research : official publication of the Orthopaedic Research Society, 36, 12, 3219, 3224, 2018年07月, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌), Adolescent idiopathic scoliosis (AIS), the most common pediatric musculoskeletal disorder, causes a three-dimensional deformity of the spine. Although rod curvature could play an important role in anatomical spinal reconstruction in patients with thoracic AIS, intraoperative contouring of the straight rod induces notches into the rod, leading to decreased fatigue strength. Here, we analyzed pre-bent rod geometries from 46 intraoperative tracings of the rod geometry, which can provide anatomical spinal reconstruction in patients with thoracic AIS. The center point clouds of the rod shapes were extracted and approximated as arcs and straight lines. The difference between the center point clouds were evaluated using the iterative closest point methods. When the rod shapes were divided into six groups based on length followed by hierarchical cluster analysis, 10 representative rod shapes were obtained with a difference value of 5 mm. Thus, we identified optimized rod shapes to guide anatomical spinal reconstruction for thoracic AIS, which will reduce not only the risk of rod breakage but also operation time, leading to decreased patient burden. © 2018 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 36:3219-3224, 2018.
  • Automated recognition and 3D CAD modeling of standardized steel bridge members in a laser scan               
    Satoshi Kanai, Motoaki Hashikawa, Hiroaki Date
    7th International Conference on Computing in Civil and Building Engineering,, 2018年06月, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • Multiple tls point cloud registration based on point projection images
    T. Sumi, H. Date, S. Kanai
    International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives, 42, 2, 1083, 1090, International Society for Photogrammetry and Remote Sensing, 2018年05月30日
    英語, 研究論文(国際会議プロシーディングス), In this paper, an efficient and robust registration method of multiple point clouds is proposed. In our research, we assume that point clouds are acquired by Terrestrial Laser Scanning (TLS) systems, and the scanned environments have a relatively flat base plane such as the ground or a floor. Our method is based on an existing pairwise registration method based on point projection images, which can quickly register the point clouds under the above assumptions. In the method, sliced point clouds are projected onto the base plane, and a binary image with feature points is created. The registration is done by using feature points of the images based on the sample consensus strategy. In this paper, first, we improve the efficiency of the pairwise registration method by introducing height and occlusion information to the image. Then, a validity check method of pairwise registration using space-classified images is proposed to avoid exhaustive pairwise registration in the multiple point cloud registration process. Finally, an efficient multiple point cloud registration algorithm based on progressive creation of a point cloud connectivity graph using iterative rough and precise pairwise registration and the validity check method is proposed. The effectiveness of our method is shown through its application to three datasets of outdoor environments.
  • Model-based next-best-view planning of terrestrial laser scanner for HVAC facility renovation
    Eisuke Wakisaka, Satoshi Kanai, Hiroaki Date
    Computer-Aided Design and Applications, 15, 3, 353, 366, Taylor and Francis Inc., 2018年05月04日, [査読有り]
    英語, 研究論文(学術雑誌), Recently, terrestrial laser scanners (TLSs) have been introduced to efficient as-built three-dimensional (3D) modeling in the heating, ventilating, and air-conditioning (HVAC) industry. When scanning the highly tangled installation of piping objects in HVAC systems using TLS, it is difficult to manually decide feasible scanner placement to scan the necessary regions of objects for construction with high accuracy and high point density and without any occlusion. Therefore, in this paper, we propose a model-based next-best-view planning method for TLS. The method uses a coarse 3D model generated by structure-from-motion (SfM), and it finds the near-optimum scanner placement that maximizes scan coverage while satisfying the constraints on the factors influencing scan quality such as beam incident angle, scan range, and scan overlap. The constraints are imposed based on user-specified scanning priority levels. Scanner placement is determined based on voxel-based space occupancy classification. The superiority of scanner placement by using the proposed method is verified through a comparative evaluation of the modeling accuracy with scanner placement by an experienced operator.
  • Efficient Registration of Laser-Scanned Point Clouds of Bridges Using Linear Features.
    Hiroaki Date, Takahito Yokoyama, Satoshi Kanai, Yoshiro Hada, Manabu Nakao, Toshiya Sugawara
    IJAT, 12, 3, 328, 338, 2018年05月01日, [査読有り]
    © 2018, Fuji Technology Press. All rights reserved. Efficient registration of point clouds from terrestrial laser scanners enables us to move from scanning to point cloud applications immediately. In this paper, a new efficient rough registration method of laser-scanned point clouds of bridges is proposed. Our method relies on straight-line edges as linear features, which often appear in many bridges. Efficient edge-line extraction and line-based registration methods are described in this paper. In our method, first, sampled regular point clouds based on the azimuth and elevation angles are created, and planar regions are extracted using the region growing on the regular point clouds. Then, straight lines of the edges of the planar regions are extracted as linear features. Next, vertical and horizontal line clusters are created according to the direction of the lines. To align the position and orientation of two point clouds, two corresponding nonparallel line pairs from line clusters are used. In the registration process, the RANSAC approach with a hash table of line pairs is used. In this process, the hash table is used for finding candidates of corresponding line pairs efficiently. Sampled points on the line pairs are used to align the line pairs, and occupied voxels and downsampled point clouds are used for efficient consensus calculation. The method is tested using three data sets of different types of bridges: a small steel bridge, a middle-size concrete bridge, and a high-pier concrete bridge. In our experiments, successful rates of our rough registration were 100%, and the processing time of rough registration for 19 point clouds was about 1 min.
  • 3D非対称性解析による革新的脊柱側弯症検診システムの研究開発
    須藤英毅, 小甲晃史, 林隆行, 安倍雄一郎, 岩田玲, 長枝浩, 岩崎倫政, 金井理
    日本整形外科学会雑誌, 92, 3, S691, 2018年03月14日
    日本語
  • 思春期特発性側弯症におけるロッド曲線形状の類似分析手法の開発
    小甲晃史, 小甲晃史, 金井理, 安倍雄一郎, 岩崎倫政, 須藤英毅
    日本整形外科学会雑誌, 92, 2, S207, 2018年03月07日
    日本語
  • Tripping risk evaluation system based on human behavior simulation in laser-scanned 3D as-is environments
    Tsubasa Maruyama, Satoshi Kanai, Hiroaki Date
    Automation in Construction, 85, 193, 208, Elsevier B.V., 2018年01月01日, [査読有り]
    英語, 研究論文(学術雑誌), Tripping-related falls are the leading cause of unintentional deaths in the elderly. Tripping risk must be evaluated by considering intrinsic and extrinsic factors affecting the interactions between humans and the environment. The goal of this study is to develop a new tripping risk evaluation system based on human behavior simulation in an “as-is” environment model, i.e., environment model reflecting detailed environmental geometry. First, a three-dimensional (3D) as-is environment model is automatically constructed from laser-scanned point clouds in the environment. From this model, potential tripping-hazard regions are automatically detected. Finally, the tripping risk of detected hazard region is quantitatively evaluated based on a combined human behavior and Monte Carlo simulation. The simulated tripping risk is compared with that measured using real humans, and it is revealed that the dimensional limit of risk evaluation accuracy in terms of barrier height on a walking terrain is very close to 10 mm.
  • 熟練看護師の視線計測による気管内吸引オントロジーの構築と今後の可能性
    コリー 紀代, 清水 弘美, 高橋 望, 小水内 俊介, 近野 敦, 金井 理, 二宮 伸治, 大塚 健, 浅賀 忠義
    医学教育, 49, 2, 117, 125, 日本医学教育学会, 2018年
    日本語,

    背景 : 在宅医療の高度化により, 気管内吸引等の高度ケアを担う人材の育成が喫緊の課題である.方法 : 気管内吸引を行う看護師と看護学生の眼球運動を測定し, 気管内吸引中の認知・判断面を含めた多重タスク構造を気管内吸引オントロジーとして可視化した.結果 : 構築された気管内吸引オントロジーの階層構造からは, 手順という手続き的知識のみならず, 医療機器に関する知識, 気管内吸引が無効であった際の選択肢に関する知識など, 多岐にわたった専門知識が要求される行為であることが示された.考察 : オントロジーは「できる」能力の範囲や評価すべき能力の定義を示す教育評価ツールとしても活用の可能性がある表現法と考えられた.

  • Simulation-Based Evaluation of Ease of Wayfinding Using Digital Human and As-Is Environment Models
    Tsubasa Maruyama, Satoshi Kanai, Hiroaki Date, Mitsunori Tada
    ISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION, 6, 9, 267, MDPI AG, 2017年09月, [査読有り]
    英語, 研究論文(学術雑誌), As recommended by the international standards, ISO 21542, ease of wayfinding must be ensured by installing signage at all key decision points on walkways such as forks because signage greatly influences the way in which people unfamiliar with an environment navigate through it. Therefore, we aimed to develop a new system for evaluating the ease of wayfinding, which could detect spots that cause disorientation, i.e., "disorientation spots", based on simulated three-dimensional (3D) interactions between wayfinding behaviors and signage location, visibility, legibility, noticeability, and continuity. First, an environment model reflecting detailed 3D geometry and textures of the environment, i.e., "as-is environment model", is generated automatically using 3D laser-scanning and structure-from-motion (SfM). Then, a set of signage entities is created by the user. Thereafter, a 3D wayfinding simulation is performed in the as-is environment model using a digital human model (DHM), and disorientation spots are detected. The proposed system was tested in a virtual maze and a real two-story indoor environment. It was further validated through a comparison of the disorientation spots detected by the simulation with those of six young subjects. The comparison results revealed that the proposed system could detect disorientation spots, where the subjects lost their way, in the test environment.
  • Development of a bridge inspection support system using two-wheeled multicopter and 3D modeling technology
    Yoshiro Hada, Manabu Nakao, Moyuru Yamada, Hiroki Kobayashi, Naoyuki Sawasaki, Katsunori Yoko Ji, Satoshi Kanai, Fumiki Tanaka, Hiroaki Date, Sarthak Pathak, Atsushi Yamashita, Manabu Yamada, Toshiya Sugawara
    Journal of Disaster Research, 12, 3, 593, 606, Fuji Technology Press, 2017年06月01日, [査読有り]
    英語, 研究論文(学術雑誌), Recently, many countries have faced serious problems associated with aging civil infra structures such as bridges, tunnels, dams, highways and so on. Aging infrastructures are increasing year by year and suitable maintenance actions are necessary to maintain their safety and serviceability. In fact, infrastructure deterioration has caused serious problems in the past. In order to prevent accidents with civil infrastructures, supervisors must spend a lot of money to maintain the safe conditions of infrastructures. Therefore, new technologies are required to reduce maintenance costs. In 2014 the Japanese government started the Cross-Ministerial Strategic Innovation Promotion Program (SIP), and technologies for infrastructure maintenance have been studied in the SIP project [1]. Fujitsu Limited, Hokkaido University, The University of Tokyo, Nagoya Institute of Technology and Docon Co. Limited have been engaged in the SIP project to develop a bridge inspection support system using information technology and robotic technology. Our system is divided into the following two main parts: bridge inspection support robots using a two-wheeled multicopter, and an inspection data management system utilizing 3D modeling technology. In this paper, we report the bridge inspection support system developed in our SIP project.
  • Efficient conformal tetrahedral finite element mesh generation for moving objects with contact by mesh adaptation
    Hiroki Maehama, Hiroaki Date, Satoshi Kanai
    JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING, 11, 4, JAMDSM0045, JAPAN SOC MECHANICAL ENGINEERS, 2017年, [査読有り]
    英語, 研究論文(学術雑誌), In current product design, CAE based on FEA has become absolutely imperative for developing high quality products. In some analyses of assembly models with movable parts such as electro-magnetic field analyses of motors, conformal tetrahedral meshes including meshes both of objects (parts) and space (called "object mesh" and "space mesh" in this paper) are needed. In general CAE processes, poses of moving parts of CAD models are first modified, then conformal meshes of the modified CAD models are generated, and FEAs are finally performed at each pose of the object in motion. However, simultaneous conformal meshing for objects and spaces is unstable and time-consuming. To reduce the frequency of the meshing, many mesh adaptation methods have been proposed. Although they can generate the conformal mesh of each object pose by modifying the mesh connectivity and vertex positions depending on the object motion, they are inefficient because the mesh topology and geometry are globally adapted even if the differences in poses of the objects in motion are very small In addition, they do not deal with contacts of the object meshes. In this paper, we propose a new efficient tetrahedral mesh adaptation method for moving objects with contact. For efficient mesh adaptation, the mesh adaptation process is applied to only a set of space mesh elements around the moving object based on a distance field. In addition, to keep mesh conformity on the contact regions between object meshes, the topology and geometry of surface triangular meshes of contacted object meshes are adapted by vertex repositioning and local topological operations. The proposed method is demonstrated using three samples. In an experimental result where a cylinder is translated toward a half tube, the conformal tetrahedral meshes with 160k tetrahedra were generated without any inverted elements for about 5 seconds in each motion step.
  • Automatic registration of MLS point clouds and SfM meshes of urban area
    Reiji Yoshimura, Hiroaki Date, Satoshi Kanai, Ryohei Honma, Kazuo Oda, Tatsuya Ikeda
    Geo-Spatial Information Science, 19, 3, 171, 181, Taylor and Francis Ltd., 2016年07月02日, [査読有り]
    英語, 研究論文(学術雑誌), Recent advances in 3D scanning technologies allow us to acquire accurate and dense 3D scan data of large-scale environments efficiently. Currently, there are various methods for acquiring large-scale 3D scan data, such as Mobile Laser Scanning (MLS), Airborne Laser Scanning, Terrestrial Laser Scanning, photogrammetry and Structure from Motion (SfM). Especially, MLS is useful to acquire dense point clouds of road and road-side objects, and SfM is a powerful technique to reconstruct meshes with textures from a set of digital images. In this research, a registration method of point clouds from vehicle-based MLS (MLS point cloud), and textured meshes from the SfM of aerial photographs (SfM mesh), is proposed for creating high-quality surface models of urban areas by combining them. In general, SfM mesh has non-scale information
    therefore, scale, position, and orientation of the SfM mesh are adjusted in the registration process. In our method, first, 2D feature points are extracted from both SfM mesh and MLS point cloud. This process consists of ground- and building-plane extraction by region growing, random sample consensus and least square method, vertical edge extraction by detecting intersections between the planes, and feature point extraction by intersection tests between the ground plane and the edges. Then, the corresponding feature points between the MLS point cloud and the SfM mesh are searched efficiently, using similarity invariant features and hashing. Next, the coordinate transformation is applied to the SfM mesh so that the ground planes and corresponding feature points are adjusted. Finally, scaling Iterative Closest Point algorithm is applied for accurate registration. Experimental results for three data-sets show that our method is effective for the registration of SfM mesh and MLS point cloud of urban areas including buildings.
  • Motion-capture-based walking simulation of digital human adapted to laser-scanned 3D as-is environments for accessibility evaluation
    Tsubasa Maruyama, Satoshi Kanai, Hiroaki Date, Mitsunori Tada
    Journal of Computational Design and Engineering, 3, 3, 250, 265, Society for Computational Design and Engineering, 2016年07月01日, [査読有り]
    英語, 研究論文(学術雑誌), Owing to our rapidly aging society, accessibility evaluation to enhance the ease and safety of access to indoor and outdoor environments for the elderly and disabled is increasing in importance. Accessibility must be assessed not only from the general standard aspect but also in terms of physical and cognitive friendliness for users of different ages, genders, and abilities. Meanwhile, human behavior simulation has been progressing in the areas of crowd behavior analysis and emergency evacuation planning. However, in human behavior simulation, environment models represent only “as-planned” situations. In addition, a pedestrian model cannot generate the detailed articulated movements of various people of different ages and genders in the simulation. Therefore, the final goal of this research was to develop a virtual accessibility evaluation by combining realistic human behavior simulation using a digital human model (DHM) with “as-is” environment models. To achieve this goal, we developed an algorithm for generating human-like DHM walking motions, adapting its strides, turning angles, and footprints to laser-scanned 3D as-is environments including slopes and stairs. The DHM motion was generated based only on a motion-capture (MoCap) data for flat walking. Our implementation constructed as-is 3D environment models from laser-scanned point clouds of real environments and enabled a DHM to walk autonomously in various environment models. The difference in joint angles between the DHM and MoCap data was evaluated. Demonstrations of our environment modeling and walking simulation in indoor and outdoor environments including corridors, slopes, and stairs are illustrated in this study.
  • VISION-BASED WAYFINDING SIMULATION OF DIGITAL HUMAN MODEL IN THREE DIMENSIONAL AS-IS ENVIRONMENT MODELS AND ITS APPLICATION TO ACCESSIBILITY EVALUATION
    Tsubasa Maruyama, Satoshi Kanai, Hiroaki Date
    PROCEEDINGS OF THE ASME INTERNATIONAL DESIGN ENGINEERING TECHNICAL CONFERENCES AND COMPUTERS AND INFORMATION IN ENGINEERING CONFERENCE, 2016, VOL 1A, AMER SOC MECHANICAL ENGINEERS, 2016年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), Elderly and disabled individuals must be able to access the indoor and outdoor environment in an easy and safe manner. Accessibility must be assessed not only in terms of physical friendliness for users, but also of cognitive friendliness such as the ease of wayfinding. To ensure the ease of wayfinding, signage information available at every key decision point is essential because it enables people to find their way in unfamiliar environment. The aim of the present study is to develop virtual accessibility evaluation system that evaluates the environment accessibility from the cognitive friendliness aspect, such as the ease of wayfinding, by combining realistic human behavior simulation using a digital human model (DHM) with as-is environment models. To realize this system, we develop a vision-based wayfinding simulation algorithm for the DHM in textured three-dimensional (3D) as-is, environment models. The as-is environment models are constructed with the structure-from-motion (SfM) technique. During the wayfinding simulation, the visibility and legibility of each sign are evaluated on the basis of the visual perception of the DHM and its visibility catchment area (VCA). The DHM walking trajectory is dynamically generated depending on the perceived sign. When a disorientation place is detected where the DHM cannot find any sign indicating its destination, plans for rearranging the signs are proposed by the simulation user and then examined using a developed virtual eyesight simulator (VES). The VES enables the user to check the DHM eyesight virtually during the wayfinding simulation through a head mounted display. To mimic visual impairments, visual impairment filters are introduced into the VES. In this paper, we demonstrate the process of detecting the disorientation place, and planning and evaluating the rearranged signage.
  • Surface extraction based on roughness for rapid reverse engineering of castings               
    Akihisa Urata, Hiroaki Date, Satoshi Kanai, Takayuki Gotoh, Seiki Yasuda
    Asian Conference on Design and Digital Engineering 2015 (ACDDE 2015) CD-ROM, 2015年11月, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), 非接触式三次元形状測定器を用いた鋳造品の迅速なリバースエンジニアリング(RE)を目的とし,計測三角形メッシュデータからの鋳肌面と機械加工面の分離する手法を提案し,面粗さ値に基づいて機械加工平面と円筒面の抽出,および鋳肌面上に存在するが機械加工面として誤検出されないように改良した面粗さ推定法と領域形状の評価による手法を提案している.
  • IMPROVEMENT OF 3D MONTE CARLO LOCALIZATION USING A DEPTH CAMERA and TERRESTRIAL LASER SCANNER
    Satoshi Kanai, R. Hatakeyama, H. Date
    International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives, 40, 4, 61, 66, International Society for Photogrammetry and Remote Sensing, 2015年05月11日, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), Effective and accurate localization method in three-dimensional indoor environments is a key requirement for indoor navigation and lifelong robotic assistance. So far, Monte Carlo Localization (MCL) has given one of the promising solutions for the indoor localization methods. Previous work of MCL has been mostly limited to 2D motion estimation in a planar map, and a few 3D MCL approaches have been recently proposed. However, their localization accuracy and efficiency still remain at an unsatisfactory level (a few hundreds millimetre error at up to a few FPS) or is not fully verified with the precise ground truth. Therefore, the purpose of this study is to improve an accuracy and efficiency of 6DOF motion estimation in 3D MCL for indoor localization. Firstly, a terrestrial laser scanner is used for creating a precise 3D mesh model as an environment map, and a professional-level depth camera is installed as an outer sensor. GPU scene simulation is also introduced to upgrade the speed of prediction phase in MCL. Moreover, for further improvement, GPGPU programming is implemented to realize further speed up of the likelihood estimation phase, and anisotropic particle propagation is introduced into MCL based on the observations from an inertia sensor. Improvements in the localization accuracy and efficiency are verified by the comparison with a previous MCL method. As a result, it was confirmed that GPGPU-based algorithm was effective in increasing the computational efficiency to 10-50 FPS when the number of particles remain below a few hundreds. On the other hand, inertia sensor-based algorithm reduced the localization error to a median of 47mm even with less number of particles. The results showed that our proposed 3D MCL method outperforms the previous one in accuracy and efficiency.
  • IMPROVEMENT OF 3D MONTE CARLO LOCALIZATION USING A DEPTH CAMERA AND TERRESTRIAL LASER SCANNER
    S. Kanai, R. Hatakeyama, H. Date
    Indoor-Outdoor Seamless Modelling, Mapping and Navigation, 44, W5, 61, 66, COPERNICUS GESELLSCHAFT MBH, 2015年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), Effective and accurate localization method in three-dimensional indoor environments is a key requirement for indoor navigation and lifelong robotic assistance. So far, Monte Carlo Localization (MCL) has given one of the promising solutions for the indoor localization methods. Previous work of MCL has been mostly limited to 2D motion estimation in a planar map, and a few 3D MCL approaches have been recently proposed. However, their localization accuracy and efficiency still remain at an unsatisfactory level (a few hundreds millimetre error at up to a few FPS) or is not fully verified with the precise ground truth. Therefore, the purpose of this study is to improve an accuracy and efficiency of 6DOF motion estimation in 3D MCL for indoor localization. Firstly, a terrestrial laser scanner is used for creating a precise 3D mesh model as an environment map, and a professional-level depth camera is installed as an outer sensor. GPU scene simulation is also introduced to upgrade the speed of prediction phase in MCL. Moreover, for further improvement, GPGPU programming is implemented to realize further speed up of the likelihood estimation phase, and anisotropic particle propagation is introduced into MCL based on the observations from an inertia sensor. Improvements in the localization accuracy and efficiency are verified by the comparison with a previous MCL method. As a result, it was confirmed that GPGPU-based algorithm was effective in increasing the computational efficiency to 10-50 FPS when the number of particles remain below a few hundreds. On the other hand, inertia sensor-based algorithm reduced the localization error to a median of 47mm even with less number of particles. The results showed that our proposed 3D MCL method outperforms the previous one in accuracy and efficiency.
  • MoCap-Based adaptive human-like walking simulation in laser-scanned large-scale as-built environments
    Tsubasa Maruyama, Satoshi Kanai, Hiroaki Date
    Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), 9185, 193, 204, Springer Verlag, 2015年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), Accessibility evaluation to enhance accessibility and safety for the elderly and disabled is increasing in importance. Accessibility must be assessed not only from the general standard aspect but also in terms of physical and cognitive friendliness for users of different ages, genders, and abilities. Human behavior simulation has been progressing in crowd behavior analysis and emergency evacuation planning. This research aims to develop a virtual accessibility evaluation by combining realistic human behavior simulation using a digital human model (DHM) with as-built environmental models. To achieve this goal, we developed a new algorithm for generating human-like DHM walking motions, adapting its strides and turning angles to laser-scanned as-built environments using motion-capture (MoCap) data of flat walking. Our implementation quickly constructed as-built three-dimensional environmental models and produced a walking simulation speed sufficient for real-time applications. The difference in joint angles between the DHM and MoCap data was sufficiently small. Demonstrations of our environmental modeling and walking simulation in an indoor environment are illustrated.
  • Quality Improvement of Deformed Mesh Models for FEA by Density and Geometry-recovering Phased ODT Smoothing
    Hiroki Maehama, Hiroaki Date, Satoshi Kanai
    Computer-Aided Design and Applications, 11, 6, 622, 631, Taylor and Francis Inc., 2014年01月01日, [査読有り]
    英語, 研究論文(学術雑誌), ABSTRACT: For realizing efficient product shape design, many dimension-driven mesh deformation methods have been proposed. However, the deformed mesh models often include many distorted elements, and lose the original mesh properties (mesh density and shape approximation accuracy). To solve these problems, we propose a quality improvement method for the deformed tetrahedral mesh models. Our method is based on Optimal Delaunay Triangulation (ODT) smoothing with edge split and edge collapse. In our method, element shape qualities are improved from the boundary to the inside of the mesh model, and original mesh properties are recovered in the deformed mesh models by an additional step in the ODT smoothing. In addition, degenerated and inverted elements are removed by local topological operations. The effectiveness of our method is demonstrated by applications to some simple mesh models.
  • A Rendering Method of Laser Scanned Point Clouds of Large Scale Environments by Adaptive Graphic Primitive Selection
    Hiroaki Date, Takashi Maeno, Satoshi Kanai
    Computer-Aided Design and Applications, 11, 6, 685, 693, Taylor and Francis Inc., 2014年01月01日, [査読有り]
    英語, 研究論文(学術雑誌), In this paper, a rendering method of the laser scanned point clouds of large scale environments is proposed for supporting an easy and intuitive understanding of the scanned environments. In this method, an adaptive primitives selection model and hierarchical point representation are used in the rendering of the scanned environment. Local geometry of the objects are estimated by principal component analysis, and the graphic primitives for points are adaptively created for effective rendering. View-dependent LOD using point hierarchy and an adaptive primitives selection model are also achieved for efficient rendering. Some rendering results for point clouds acquired from different scanning systems are shown and compared with other methods.
  • As-built modeling of piping system from terrestrial laser-scanned point clouds using normal-based region growing
    Kazuaki Kawashima, Satoshi Kanai, Hiroaki Date
    Journal of Computational Design and Engineering, 1, 1, 13, 26, Society for Computational Design and Engineering, 2014年01月01日, [査読有り], [招待有り]
    英語, 研究論文(学術雑誌), Recently, renovations of plant equipment have been more frequent because of the shortened lifespans of the products, and as-built models from large-scale laser-scamied data is expected to streamline rebuilding processes. However, the laser-scanned data of an existing plant has an enormous amount ofpoints, captures inmcate objects, and includes a high noise level, so the manual reconstmction of a 3D model is very time-consuming and costly. Among plant equipment, piping systems account for the greatest proportion. Therefore, the purpose of this research was to propose an algorithm which could automatically recognize a piping system from the terrestrial laser- scanned data plant equipment. The straight pomon pipes, connecting parts, and connection relationship ofthe piping system can be recognized in this algorithm. Normal-based region growing and cylinder surface fitting can extract all possible locations ofpipes, including straight pipes, elbows, and junctions. Tracing the axes of a piping system enables the recognition of the positions of these elements and their connection relationship. Using only point clouds, the recognition algorithm can be performed in a fUlly automatic way. The algorithm was applied to large-scale scamied data of an oil rig and a chemical plant. Recognition rates of about 86%, 88%, and 71% were achieved straight pipes, elbows, andjunctions, respectively.
  • 大規模3次元レーザ計測とデジタルヒューマンモデルを活用したas-built環境内の基本歩行シミュレーション技術の開発
    丸山翼, 金井理, 伊達宏昭
    精密工学会誌, 80, 8, 755, 762, 2014年, [査読有り]
    日本語, 研究論文(学術雑誌)
  • Finding the next-best scanner position for as-built modeling of piping systems
    K. Kawashima, S. Yamanishi, S. Kanai, H. Date
    International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives, 40, 5, 313, 320, International Society for Photogrammetry and Remote Sensing, 2014年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), Renovation of plant equipment of petroleum refineries or chemical factories have recently been frequent, and the demand for 3D as-built modelling of piping systems is increasing rapidly. Terrestrial laser scanners are used very often in the measurement for as-built modelling. However, the tangled structures of the piping systems results in complex occluded areas, and these areas must be captured from different scanner positions. For efficient and exhaustive measurement of the piping system, the scanner should be placed at optimum positions where the occluded parts of the piping system are captured as much as possible in less scans. However, this "next-best" scanner positions are usually determined by experienced operators, and there is no guarantee that these positions fulfil the optimum condition. Therefore, this paper proposes a computer-aided method of the optimal sequential view planning for object recognition in plant piping systems using a terrestrial laser scanner. In the method, a sequence of next-best positions of a terrestrial laser scanner specialized for as-built modelling of piping systems can be found without any a priori information of piping objects. Different from the conventional approaches for the next-best-view (NBV) problem, in the proposed method, piping objects in the measured point clouds are recognized right after an every scan, local occluded spaces occupied by the unseen piping systems are then estimated, and the best scanner position can be found so as to minimize these local occluded spaces. The simulation results show that our proposed method outperforms a conventional approach in recognition accuracy, efficiency and computational time.
  • HOMOGRAPHY-BASED LOW-COST GAZE ESTIMATION AND ITS APPLICATION TO THE USABILITY ASSESSMENT OF DIGITAL PROTOTYPES OF INFORMATION APPLIANCES
    Satoshi Kanai, Hiroaki Date
    PROCEEDINGS OF THE ASME INTERNATIONAL DESIGN ENGINEERING TECHNICAL CONFERENCES AND COMPUTERS AND INFORMATION IN ENGINEERING CONFERENCE, 2013, VOL 2B, AMER SOC MECHANICAL ENGINEERS, 2014年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), Recently 3D digital prototypes of information appliances have been proposed for efficient user acceptance tests of user-interface (UI) usability. The purpose of this research is to develop a gaze estimation system based on Homography and to fully integrate it with a 3D digital prototype of the information appliances in order to obtain information more useful for usability assessment. The estimation system consists only of four infrared LEDs and a USB camera and is low-cost. The gaze estimation enables the system not only to record a gaze point on the prototype but to identify the UI objects which the user is looking for in real time during the test session. A gaze-based index was newly introduced to identify the misleading UI objects and to quantify the irrelevance of the UI design. A case study suggested that the integration of the gaze estimation with the 3D digital prototype and the proposed index were useful for automatically identifying which irrelevant UI objects misled the users' operations which could not yet be captured in previous simple event logging of the user inputs.
  • As-built modeling of piping system from terrestrial laser-scanned point clouds using normal-based region growing
    Kazuaki Kawashima, Satoshi Kanai, Hiroaki Date
    Journal of Computational Design and Engineering, 1, 1, 13, 26, Society for Computational Design and Engineering, 2014年01月01日, [査読有り]
    英語, 研究論文(学術雑誌), Recently, renovations of plant equipment have been more frequent because of the shortened lifespans of the products, and as-built models from large-scale laser-scamied data is expected to streamline rebuilding processes. However, the laser-scanned data of an existing plant has an enormous amount ofpoints, captures inmcate objects, and includes a high noise level, so the manual reconstmction of a 3D model is very time-consuming and costly. Among plant equipment, piping systems account for the greatest proportion. Therefore, the purpose of this research was to propose an algorithm which could automatically recognize a piping system from the terrestrial laser- scanned data plant equipment. The straight pomon pipes, connecting parts, and connection relationship ofthe piping system can be recognized in this algorithm. Normal-based region growing and cylinder surface fitting can extract all possible locations ofpipes, including straight pipes, elbows, and junctions. Tracing the axes of a piping system enables the recognition of the positions of these elements and their connection relationship. Using only point clouds, the recognition algorithm can be performed in a fUlly automatic way. The algorithm was applied to large-scale scamied data of an oil rig and a chemical plant. Recognition rates of about 86%, 88%, and 71% were achieved straight pipes, elbows, andjunctions, respectively.
  • Feature-Based 3D Process Planning for MEMS Fabrication.
    Satoshi Kanai, Takayuki Shibata, Takahiro Kawashima
    IJAT, 8, 3, 406, 419, Fuji Technology Press, 2014年, [査読有り]
    英語
  • Editorial: CAD, CAM, and Digital Engineering.
    Satoshi Kanai, Keiichi Shirase
    IJAT, 8, 3, 303, 2014年, [査読有り]
  • Accurate registration of MMS point clouds of urban areas using trajectory               
    TAKAI Shyungo, DATE Hiroaki, KANAI Satoshi, NIINA Y, ODA K, IKEDA T
    ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci., II-5/W2, 277, 282, 2013年11月, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • Automatic recognition of piping system from laser scanned point clouds using normal-based region growing               
    川島千明, 金井理, 伊達宏昭
    ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci., II-5/W2, 121, 126, 2013年11月, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • Data Modeling and Geometry Registration for the Integrated Management of the BIM and Laser-scanned Point Clouds               
    YAMAOKA Shinya, KANAI Satoshi, DATE Hiroaki
    Proc. International Conference on Civil and Building Engineering Informatics, 55, 63, 2013年11月, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • Making a Digital Human Walk Directly in the 3D Laser-scanned Point Clouds of Indoor Environments               
    MARUYAMA Tsubasa, KANAI Satoshi, DATE Hiroaki
    Proc. International Conference on Civil and Building Engineering Informatics, 69, 76, 2013年11月, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • As-built modeling of piping system from terrestrial laser scanned point clouds using normal-based region-growing               
    KAWASHIMA Kazuaki, KANAI Satoshi, DATE Hiroaki
    Proc. 2013 Asian Conference on Design and Digital Engineering, 552, 562, 2013年08月, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • Variational hand modeling based on image-based 3D model reconstruction               
    XIE Yulai, KANAI Satoshi, DATE Hiroaki
    Proc. 2013 Asian Conference on Design and Digital Engineering, 542, 551, 2013年08月, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • Detection and Classification of Pole-like Objects from Mobile Laser Scanning Data of Urban Environments               
    YOKOYAMA Hiroki, KANAI Satoshi, DATE Hiroaki, TAKEDA Hiroshi
    International Journal of CAD/CAM, 13, 2, 31, 40, 2013年08月, [査読有り], [招待有り]
    英語, 研究論文(学術雑誌)
  • An Efficient Simulation of Skin Contact Deformation for Virtual Ergonomic Assessments of Handheld Products               
    XIE Yulai, KANAI Satoshi, DATE Hiroaki
    International Journal of CAD/CAM, 13, 1, 81, 95, 2013年08月, [査読有り]
    英語, 研究論文(学術雑誌)
  • Segmentation of MMS Point Clouds of Urban Area Based on Principal Component Analysis               
    Hiroaki Date, Teppei mori, Hiroki Yokoyama, Satoshi Kanai, Hiroshi Takeda
    Proc. 2013 The International Symposium on Mobile Mapping Technology, Paper No.111, 2013年04月, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • Decomposing scanned assembly meshes based on periodicity recognition and its application to kinematic simulation modeling
    Tomohiro Mizoguchi, Satoshi Kanai
    COMPUTER-AIDED DESIGN, 45, 4, 829, 842, ELSEVIER SCI LTD, 2013年04月, [査読有り], [招待有り]
    英語, 研究論文(学術雑誌), Along with the recent growth of industrial X-ray computerized tomography (CT) scanning systems, it is now possible to non-destructively acquire the entire meshes of assemblies. This technology has the potential to realize an advanced inspection process of an assembly, such as estimation of their assembly errors or examinations of their dynamic behaviors in motion using a model reflecting real assembled situations. However, to realize the process, it is necessary to accurately decompose the mesh and to extract a set of partial meshes, each of which corresponds to a single part, from the entire meshes of assemblies measured from the CT scans. Moreover, it is required to create models that are ready for dynamic behavior simulations.
    In this paper, we focus on CT scanned meshes of gear assemblies as examples, and propose beneficial methods for establishing such advanced inspections. We first propose a method that accurately decomposes the mesh into partial meshes, each of which corresponds to a single gear, using periodicity recognitions. The key idea is first to accurately recognize the periodicity of each gear, then to extract sets of topologically connected mesh elements where periodicities are valid, and finally to interpolate points in plausible ways from an engineering viewpoint to the area where surface meshes are not generated, especially the contact area between parts in the CT scanning process. We also propose a method for creating kinematic simulation models which can be used for a gear teeth contact evaluation using extracted partial meshes and their periodicities. Such an evaluation of teeth contacts is one of the most important functions in kinematic simulations of gear assemblies for predicting the power transmission efficiency, noise and vibration. The characteristics of the proposed method is that (1) it can robustly and accurately recognize periodicities from noisy scanned meshes, (2) it can estimate the plausible boundaries of neighboring parts without any previous knowledge from single-material CT scanned meshes, and (3) it can efficiently extract partial meshes from large scanned meshes containing millions of triangles in a few minutes. We demonstrate the effectiveness of our method on a variety of artificial and real CT scanned meshes. (C) 2011 Elsevier Ltd. All rights reserved.
  • Homography-based low-cost gaze estimation and its application to the usability assessment of digital prototypes of information appliances
    Satoshi Kanai, Hiroaki Date
    Proceedings of the ASME Design Engineering Technical Conference, 2, DETC2013-12931, American Society of Mechanical Engineers, 2013年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), Recently 3D digital prototypes of information appliances have been proposed for efficient user acceptance tests of user interface (UI) usability. The purpose of this research is to develop a gaze estimation system based on Homography and to fully integrate it with a 3D digital prototype of the information appliances in order to obtain information more useful for usability assessment. The estimation system consists only of four infrared LEDs and a USB camera and is low-cost. The gaze estimation enables the system not only to record a gaze point on the prototype but to identify the UI objects which the user is looking for in real time during the test session. A gazebased index was newly introduced to identify the misleading UI objects and to quantify the irrelevance of the UI design. A case study suggested that the integration of the gaze estimation with the 3D digital prototype and the proposed index were useful for automatically identifying which irrelevant UI objects misled the users' operations which could not yet be captured in previous simple event logging of the user inputs. Copyright © 2013 by ASME.
  • Simulating a walk of digital human model directly in massive 3D laser-scanned point cloud of indoor environments
    Tsubasa Maruyama, Satoshi Kanai, Hiroaki Date
    Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), 8026, 2, 366, 375, 2013年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), Recently, human behavior simulations in 3-dimensional environment models have been enabled by the advance in computer performances. However, manually building the 3D models for the simulations are still costly and time-consuming, and the resultant models are sometimes inaccurate and do not necessarily reflect as-built environments. The final goal of our research is to realize the accessibility evaluation of "as-built" environments based on the human behavior simulation. To achieve the goal, in this study, we developed a technology where as-built 3D environment models could be constructed in a fully automatic way from laser-scanned 3D point clouds measured from as-built indoor environments. Additionally, we realized a basic walking simulation function in the as-built environment model represented by the point clouds. The modeling and simulation efficiency and accuracy were evaluated. © 2013 Springer-Verlag.
  • Anatomy-based variational modeling of digital hand and its verification
    Yulai Xie, Satoshi Kanai, Hiroaki Date
    Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), 8026, 2, 384, 392, 2013年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), This study proposed a method to construct an anatomy-based variational modeling of a Digital Hand model, which can be used to efficiently generate various individual hand models with different dimensions for virtual ergonomic assessments. The skin surface of a generic hand model was hierarchically partitioned into 15 segments according to the hand surface anatomy. Then it was deformed by scaling and aligning the segments so that it satisfied individual hand dimensions. Moreover, the hand models of different hand postures with markers were reconstructed using a multi-view 3D model reconstruction technique. The extracted positions of markers were used to estimate the individual bone-link structure. The proposed method was validated through comparing the generated hand skin model which fitted the hand dimensions of a subject with his MRI-measured hand surface, and comparing the generated bone-link structure, which fitted joint motion of the subject, with the reconstructed hand models based on a multi-view 3D reconstruction technique. © 2013 Springer-Verlag.
  • Robust and exhaustive method for symmetry detection from scanned meshes
    Tomohiro Mizoguchi, Satoshi Kanai, Hiroaki Date, Hiroyuki Tanaka
    Journal of Advanced Mechanical Design, Systems and Manufacturing, 7, 5, 862, 875, JAPAN SOC MECHANICAL ENGINEERS, 2013年, [査読有り], [招待有り]
    英語, 研究論文(学術雑誌), Engineering objects often exhibit symmetries on their surfaces for functionality or aesthetics. Detecting such symmetries from their scanned meshes enables advanced applications, such as feature-based CAD model reconstruction or mesh size reduction for efficient CAE. In this paper, we propose a new method for detecting a common class of symmetries in engineering, such as translation, rotation and reflection, from scanned meshes of a variety of objects ranging from mechanical parts to aesthetic products. Major advantages of our proposed method over conventional ones are considerable robustness for scanner noise and exhaustive detection of multiple symmetries from a mesh. We demonstrate its effectiveness from various experiments on scanned meshes acquired by laser or CT scanners. We also show that surface distortions or deformations on the object surfaces can be evaluated using symmetries quantitatively. © 2013 by JSME.
  • 段階的ODTスムージングを用いた寸法駆動変形四面体メッシュの品質改善:解析用メッシュのセグメンテーションと任意曲面のメッシュ品質改善
    前濱 宏樹, 伊達 宏昭, 金井 理
    精密工学会学術講演会講演論文集, 2013, 845, 846, 公益社団法人 精密工学会, 2013年
    日本語, 本研究では,CAEによるパラメータサーベイ効率化を目的とした,段階的ODTスムージングに基づく寸法駆動変形四面体メッシュの品質改善手法を提案してきた.本報では,円錐面や球面,トーラス面等のより多くの種類の曲面のメッシュ品質改善を目的として,法線テンソルに基づく初期表面領域抽出と領域間の幾何学的特性を用いた解析メッシュセグメンテーション手法と,局所パラメータ化による任意曲面のメッシュ品質改善手法を提案する.
  • 情報機器プロトタイピングためのRP造形モデルを用いた3次元トラッキング(第2報):爪先色変化検出による入力イベントの認識
    関 佳斌, 金井 理, 伊達 宏昭
    精密工学会学術講演会講演論文集, 2013, 837, 838, 公益社団法人 精密工学会, 2013年
    日本語, ハンドヘルド情報機器のユーザビリティ評価ができるVirtual prototypeの開発を行うため,小型photo-detectorを用いた爪先色変化による入力イベントの認識機能を開発した.製品上のタッチパネルに対するタップやドラッグ操作をRP造型モデル上で認識するため,本研究では,指先接触時に爪先の色変化をphoto-detectorで検出する.さらに,detector裏面のLED光を二次元画像トラッキングすることにより,指先位置の検出を試みた.
  • Variational digital hand modeling using image-based 3D model reconstruction
    謝 雨来, 金井 理, 伊達 宏昭
    精密工学会学術講演会講演論文集, 2013, 827, 828, 公益社団法人 精密工学会, 2013年
    英語, A method for variational modeling of individual hands from a template hand model is described. The marked individual hand is reconstructed based on image-based multi-view 3D model reconstruction technique. According to hand joint anatomical knowledge, a single axis rotation assumption is proposed for estimating the joint axes and joint centers by the positions of dot markers at the backside of the hand skin in different hand postures. On the other hand, the skin surface of the template hand model is hierarchically partitioned into segments according to the hand surface anatomy by main creases on palmar side. The segments of the template hand model are scaled according to the feature dimensions of the reconstructed individual hand model. Finally, the template hand model scaled in segment-wise way is registered to the reconstructed hand model by a rough alignment process where the gravity center of the point sets on the creases of both models are matched and a fine alignment process where the segments of both models are matched based on ICP algorithm. Compared with previous works, the method is more subject-friendly, inexpensive, and efficient.
  • RANSACによる屋内環境レーザ計測点群のBIM構成要素への効率的なマッチングと差分点抽出
    山岡 晋也, 金井 理, 伊達 宏昭
    精密工学会学術講演会講演論文集, 2013, 641, 642, 公益社団法人 精密工学会, 2013年
    日本語, 本研究では, 急速に普及しているBIMの継続的更新を実現させるため, 建物内をレーザ計測した点群データを用いて変更情報を抽出し, BIMに反映させることを目的とする. 本報では, 変更情報の抽出を可能とするため, RANSACにより計測点群をBIMの構成要素へ自動的に, かつ高速にレジストレーションし, 対応付ける手法を開発した. さらに, BIMへ関連付けられない点を差分点として抽出する手法を提案する.
  • 大規模環境レーザ計測点群からの配管系統の自動認識(第5報):法線ベクトルに基づくRegion-growingによる認識の高精度化
    川島 千明, 金井 理, 伊達 宏昭
    精密工学会学術講演会講演論文集, 2013, 637, 638, 公益社団法人 精密工学会, 2013年
    日本語, 本研究では,生産設備やプラント施設のレーザ計測点群中から,配管系統を自動的に認識抽出することを目的とする.本報では,法線に基づくregion-growingを用いて配管系統に含まれる直進パイプの認識を行った後,認識された直進パイプの軸線と付近の計測点群を用いて接続要素の認識を行うことで各要素の認識率の高精度化を図った.
  • レーザスキャン環境モデル内でのデプスカメラによるモンテカルロ自己位置推定
    畠山 龍, 金井 理, 伊達 宏昭
    精密工学会学術講演会講演論文集, 2013, 633, 634, 公益社団法人 精密工学会, 2013年
    日本語, 近年,BIMの普及や地上設置型の3Dレーザースキャナの進歩から屋内環境の3次元モデルの利用が容易になってきている.将来的には人の屋内ナビゲーションサービスへの利用などが考えられるが,それには3次元の自己位置推定が必要不可欠である.そこで本研究では3Dレーザースキャナにより得られた詳細な3次元モデルを環境情報として利用し,近年注目されている距離センサであるデプスカメラを用いて3次元の自己位置推定を行い,その精度検証を行った.
  • 実環境のレーザ計測点群内における人間行動シミュレーションとそのアクセシビリティ評価への応用(第4報):らせん階段と坂道を含む屋内・屋外環境上での歩行シミュレーション機能の開発
    丸山 翼, 金井 理, 伊達 宏昭
    精密工学会学術講演会講演論文集, 2013, 645, 646, 公益社団法人 精密工学会, 2013年
    日本語, 人間行動シミュレーションのための大規模環境モデルの構築は現在人手で行われており,そのコスト,品質,正確さに問題がある.本研究では,実環境の3次元レーザ計測点群を用いて,人間行動シミュレーションに基づく環境のアクセシビリティ評価のための,現状を正確に反映した大規模環境モデルを,低コストに自動構築する技術の開発を目的とする.本報では,前報で開発した歩行シミュレーション機能を,らせん階段を含む2階建ての屋内環境,および凹凸のある坂道を含む,約2億点からなる屋外環境の大規模計測点群上においても人間のモデルが自律的に歩行可能な機能へと拡張したので報告する.
  • Anatomy-based variational modeling of digital hand and its verification
    Yulai Xie, Satoshi Kanai, Hiroaki Date
    Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), 8026, 2, 384, 392, Springer, 2013年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), This study proposed a method to construct an anatomy-based variational modeling of a Digital Hand model, which can be used to efficiently generate various individual hand models with different dimensions for virtual ergonomic assessments. The skin surface of a generic hand model was hierarchically partitioned into 15 segments according to the hand surface anatomy. Then it was deformed by scaling and aligning the segments so that it satisfied individual hand dimensions. Moreover, the hand models of different hand postures with markers were reconstructed using a multi-view 3D model reconstruction technique. The extracted positions of markers were used to estimate the individual bone-link structure. The proposed method was validated through comparing the generated hand skin model which fitted the hand dimensions of a subject with his MRI-measured hand surface, and comparing the generated bone-link structure, which fitted joint motion of the subject, with the reconstructed hand models based on a multi-view 3D reconstruction technique. © 2013 Springer-Verlag.
  • Simulating a walk of digital human model directly in massive 3D laser-scanned point cloud of indoor environments
    Tsubasa Maruyama, Satoshi Kanai, Hiroaki Date
    Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), 8026, 2, 366, 375, Springer, 2013年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), Recently, human behavior simulations in 3-dimensional environment models have been enabled by the advance in computer performances. However, manually building the 3D models for the simulations are still costly and time-consuming, and the resultant models are sometimes inaccurate and do not necessarily reflect as-built environments. The final goal of our research is to realize the accessibility evaluation of "as-built" environments based on the human behavior simulation. To achieve the goal, in this study, we developed a technology where as-built 3D environment models could be constructed in a fully automatic way from laser-scanned 3D point clouds measured from as-built indoor environments. Additionally, we realized a basic walking simulation function in the as-built environment model represented by the point clouds. The modeling and simulation efficiency and accuracy were evaluated. © 2013 Springer-Verlag.
  • Adaptive Selection of Rendering Primitives for Point Clouds of Large Scale Environments               
    MAENO Takashi, DATE Hiroaki, KANAI Satoshi
    Proceedings of the 2012 Asian Conference on Design and Digital Engineering (ACDDE2012), Paper No.100078, 2012年12月, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • Automatic Recognition and Modeling of Piping System from Large-scale Terrestrial Laser Scanned Point Cloud               
    KAWASHIMA Kazuaki, KANAI Satoshi, DATE Hiroaki, KIM Tae-wan
    Proceedings of the 2012 Asian Conference on Design and Digital Engineering (ACDDE2012), Paper No.100022, 2012年12月, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • Feature-based 3D Process Planning for MEMS Fabrication               
    KANAI Satoshi, SHIBATA Takayuki, KAWASHIMA Takahiro
    Proceedings of the 2012 Asian Conference on Design and Digital Engineering (ACDDE2012), Paper No.100093, 2012年12月, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • Constructing a deformable human hand model in contact for virtual ergonomic assessment               
    Yulai XIE, Satoshi KANAI, Hiroaki DATE
    Proceedings of the 2012 Asian Conference on Design and Digital Engineering (ACDDE2012), Paper No.100047, 2012年12月, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • Quality Improvement of Finite Element Mesh Models Modified by Mesh Deformation               
    Hiroki Maehama, Hiroaki Date, Satoshi Kanai
    Proceedings of the 2012 Asian Conference on Design and Digital Engineering (ACDDE2012), Paper No.100064, 2012年12月, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • 大規模環境レーザ計測点群からの配管系統の自動認識
    川島千明, 金井理, 伊達宏昭
    精密工学会誌, 78, 8, 722, 729, 公益社団法人 精密工学会, 2012年08月, [査読有り]
    日本語, 研究論文(学術雑誌), Recently, changes of plant equipments become more frequent, and the construction of as-built models of the existing plant from laser scan data is expected to make the reconstruction processes more efficient. The purpose of this research is to propose an algorithm which can recognize a piping system from terrestrial laser scan data of plant equipments. The straight portion of pipes, connecting relationship of the piping system can be recognized in this algorithm. Eigenvalue analyses of the point clouds and of the normal vectors enable the recognition. Using only point clouds, the recognition algorithm can be applied to registered point clouds and can be performed in a fully automatic way. The recognition results of real plants have shown the effectiveness of the algorithm.
  • Automatic recognition of a piping system from laser scanned points by eigenvalue analysis
    Kazuaki Kawashima, Satoshi Kanai, Hiroaki Date
    EMERGING TECHNOLOGY IN PRECISION ENGINEERING XIV, 523-524, 932, 938, TRANSACTION PUBLISHERS, 2012年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), In recent years, changes in plant equipment have been becoming more frequent, and as-built modeling of plants from large-scale laser scanned data is expected to make their rebuilding processes more efficient. The purpose of our research was to propose an algorithm which can automatically recognize piping systems from massive terrestrial laser scanned point clouds of plants. Point clouds of a piping system can be extracted based on eigenvalue analysis and using region-growing from the laser scanned points. Eigenvalue analysis of the point clouds and point normals then allows for the recognition of straight portions of pipes. Connecting parts can also be recognized from the connection relationship between pipe axes and their neighboring scanned point distributions.
  • Simulation of contact deformation property of Digital Hand skin and its experimental verifications
    Yulai Xie, Satoshi Kanai, Hiroaki Date
    EMERGING TECHNOLOGY IN PRECISION ENGINEERING XIV, 523-524, 339, 344, TRANSACTION PUBLISHERS, 2012年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), The contact deformation of human skin is a significant factor in the virtual ergonomic assessment of handheld products, but previous works have neglected it or dealt with it in a simple way. In this paper, we propose a physical model of the contact deformation of human skin and, based on this model, present an efficient contact solving method to simulate the physical contact of the Digital Hand with product surfaces. The realistic contact deformation effect was realized, and we experimentally verified the estimated contact area, contact force and pressure distribution, and found the estimation results by the proposed model and the contact solving method well fit with the experimental data and the past data from the literature.
  • Object recognition in terrestrial laser scan data using spin images
    Hiroaki Date, Yusuke Kaneta, Akihiro Hatsukaiwa, Masahiko Onosato, Satoshi Kanai
    Computer-Aided Design and Applications, 9, 2, 187, 197, 2012年, [査読有り]
    英語, 研究論文(学術雑誌), This paper describes a method of object recognition in terrestrial laser scan data of complex scenes. By local 3D shape matching between the CAD model mesh of the object and the laser scan data of the scene, the existence of the object is recognized and its location and orientation in the scene are extracted. Spin-images are used for shape matching. In this paper, some techniques for applying spin-image matching to the terrestrial laser scan data are proposed. They include robustness improvements for the scan noise and the differences in vertex densities by normal averaging and uniform point sampling, and efficient calculation by using multi-resolution images and geometric point filtering. © 2012 CAD Solutions, LLC.
  • Appearance preserving simplification of 3D CAD model with large-scale assembly structures
    Satoshi Kanai, Daisuke Iyoda, Yui Endo, Hideki Sakamoto, Naoki Kanatani
    International Journal on Interactive Design and Manufacturing, 6, 3, 139, 154, 2012年, [査読有り], [招待有り]
    英語, 研究論文(学術雑誌), Currently commercial 3D CAD systems which had only been used in upper stage of design scenes become widely used in lower stages such as rough sales purposes, model exporting to external users or e-commerce on Web. Usually, in the design stage, solid models even of very fine parts or full-detailed shapes have been built in the CAD systems, and the assembly models tend to have a huge number of parts and very complex inner structures. Moreover, for achieving the light-weight and strengthened parts, the inner structures of the housing such as ribs or bosses have had very complex geometries. However, when they are used for browsing, styling review and sales purposes, there is hardly the occasion where is full-detailed assembly models are required, and the primary purpose of the systems is often to fast render external shapes rather than to render detailed inner structures. Appearance preserving simplification of large scale assembly model available to the commercial 3D CAD systems is strongly needed for these purposes. Therefore, this paper proposes several appearance preserving simplification methods of 3D CAD model with large-scale assembly structures. Three simplification methods are proposed in the paper
    (1) only by removing invisible parts from the assembly, (2) by removing both invisible form features from the part surface and invisible parts themselves from the assembly, and (3) by removing both form features and parts which are invisible even when position and orientation of movable parts change in the assembly. Our methods are based on an algorithm which can directly detect invisible parts or features by pre-rendering the models from multiple view directions and reading the rendered results from the frame buffer. Our algorithm can be carried out regardless of CAD systems. Thanks to using the current GPU, invisible parts or features detection is robust and fast in the algorithm. If needed, geometric dependency among the features in the assembly can be kept even in the simplification. The performances of these simplification methods in model size reduction and the processing time are examined. © 2012 Springer-Verlag.
  • Efficient simulation of human hand skin deformation based on a nonlinear elasticity model for virtual ergonomic assessment
    謝 雨来, 金井 理, 伊達 宏昭
    精密工学会学術講演会講演論文集, 2012, 271, 272, 公益社団法人 精密工学会, 2012年
    英語, Hand skin deformation is a significant role in the virtual ergonomic assessment of handheld products. In this paper, a nonlinear elasticity model is used to simulate the skin contact deformation, and quasi volume preserving property of skin is considered for more realistic simulation. An efficient contact solving method is developed for simulating the physical contact with product surfaces. The hand surface skin is partitioned anatomically into different regions for being able to specify different physical properties in them and for efficient simulation for the ergonomic assessment of grasp ability. The realistic contact deformation effect was efficiently realized, and was experimentally verified. The verification results show that the proposed skin deformable model is effective, in the acceptable range for virtual ergonomic assessment.
  • 大規模環境レーザ計測点群の効果的表示のための適応的描画プリミティブ選択
    前野 峻, 伊達 宏昭, 金井 理
    精密工学会学術講演会講演論文集, 2012, 301, 302, 公益社団法人 精密工学会, 2012年
    日本語, 大規模環境レーザ計測点群の表示は,計測環境の直感的な理解や概観を得るために必要である.しかし,視点が点群に近づいた際,点のみによる表示では面的な情報がないため,計測環境の目視による理解が困難となる.本研究では大規模環境レーザ計測点群の目視による理解を容易にするために,視点からの距離や点分布状況に応じて描画プリミティブ(点,線分,スプラット,メッシュ)を適応的に選択した点群表示手法について述べる.
  • 実環境のレーザ計測点群内における人間行動シミュレーションとそのアクセシビリティ評価への応用(第1報):計測点群内における基本歩行シミュレーション機能の開発
    丸山 翼, 金井 理, 伊達 宏昭
    精密工学会学術講演会講演論文集, 2012, 303, 304, 公益社団法人 精密工学会, 2012年
    日本語, 近年,大規模環境内における人間行動シミュレーションに関する研究が活発に行われている.しかし,これらのシミュレーション環境の構築は人手で行われており,そのコスト,品質,正確さに問題がある.そこで本研究では,実環境の3次元レーザ計測点群を用いた,現状を正確に反映した低コストな人間行動シミュレーションの実現を目的とする.本報では,屋内環境の計測点群内における人間の歩行シミュレーションについて報告する.
  • 市街地レーザ計測点群からの柱状物体認識と分類:コンテクスト特徴を用いた分類精度改善
    横山 博貴, 伊達 宏昭, 金井 理, 武田 浩志
    精密工学会学術講演会講演論文集, 2012, 281, 282, 公益社団法人 精密工学会, 2012年
    日本語, 本研究では,設備管理の対象として需要が高い電柱や街灯,標識などの柱状物体を,市街地レーザ計測点群から自動的に認識・分類することを目的としている.これまで柱状物体の認識手法,ならびに電柱,街灯,標識への分類手法を提案してきた.本報では,柱状物体のパーツ構造などの形状特徴,ならびに他の柱状物体との相対的な位置関係から求まるコンテクスト特徴に基づいて,柱状物体の分類精度を改善するアルゴリズムを提案する.
  • 段階的ODTスムージングを用いた寸法駆動変形メッシュの品質改善
    前濱 宏樹, 伊達 宏昭, 金井 理
    精密工学会学術講演会講演論文集, 2012, 259, 260, 公益社団法人 精密工学会, 2012年
    日本語, CAEプロセスの効率化を目的とした四面体メッシュの寸法駆動変形手法が提案されている.しかし,変形後の四面体メッシュは要素形状品質が低下し,変形前のメッシュ密度や形状近似精度も失われてしまう.本報ではメッシュ密度や近似精度を考慮した頂点の追加・削除とスムージング手法をシャープエッジから形状表面,形状内部へ段階的に適用することによる,変形後の四面体メッシュの品質改善手法を提案する.
  • 大規模環境レーザ計測点群からの配管系統の自動認識(第3報):パイプ及び接続要素の定義パラメータ抽出
    川島 千明, 金井 理, 伊達 宏昭, 金 泰完
    精密工学会学術講演会講演論文集, 2012, 279, 280, 公益社団法人 精密工学会, 2012年
    日本語, 本研究では,生産設備やプラント施設のレーザ計測点群中から,配管系統を自動的に認識抽出することを目的とする.本報では,グリッド化を用いた前報のアルゴリズムの高速化に加えて,配管系統の軸上の点列への曲線フィッティングによる接続関係の認識と,認識結果に基づくパイプ直進部とエルボ・連結部の3Dモデリングに必要となる定義パラメータ抽出を行ったので報告する.
  • Special Issue on Asian Conference on Design and Digital Engineering 2011 Preface
    Hiromasa Suzuki, Hiroshi Katoh, Hideki Aoyama, Satoshi Kanai, Tetsuro Ogi, Takashi Kanai
    JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING, 6, 3, 323, 323, JAPAN SOC MECHANICAL ENGINEERS, 2012年, [査読有り]
    英語
  • ESTIMATING EASE OF SINGLE-FINGERED OPERATIONS OF HAND-HELD APPLIANCES WITH DIGITAL HAND
    Satoshi Kanai, Seiya Suzuki
    PROCEEDINGS OF THE ASME INTERNATIONAL DESIGN ENGINEERING TECHNICAL CONFERENCES AND COMPUTERS AND INFORMATION IN ENGINEERING CONFERENCE, 2011, VOL 2, PTS A AND B, 897, 905, AMER SOC MECHANICAL ENGINEERS, 2012年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), Ergonomic-conscious design of hand-held information appliances greatly strengthens their competitiveness. However, current ergonomic assessments are carried out in the form of "real" user-tests which need many human subjects and expensive physical mockups, and only subjective evaluations are obtained. To solve these problems, in this paper, the Digital Hand where the 3D bone structure, surface skin geometry of the human hand are imitated was developed for quantitatively estimating the ease of single-fingered operations of hand-held appliances. The ease is estimated based on the reachability of a finger tip to several specified operation target points, and on the finger joint angle margin which reflects the mobile range of motions of all operating fingers' joints. An effective correlation was found between the estimation measures and the subjective comfort ratings in the fingered operations of a SLR camera.
  • An optimal delay management algorithm from passengers' viewpoints considering the whole railway network
    Satoshi Kanai, Koichi Shiina, Shingo Harada, Norio Tomii
    Journal of Rail Transport Planning and Management, 1, 1, 25, 37, 2011年11月, [査読有り]
    英語, 研究論文(学術雑誌), We propose an algorithm for optimal delay management. Delay management means a decision whether or not to keep a connection between trains and is made by dispatchers when trains are delayed. We set dissatisfaction of all passengers in the whole railway network as a criterion and develop an algorithm which seeks for a delay management plan which minimizes passengers' dissatisfaction. The algorithm is a combination of simulation and optimization. The simulation part consists of a train traffic simulator and a passenger flow simulator which work in parallel. The train traffic simulator forecasts future train diagrams considering the dynamic interaction between trains and passengers. The passenger flow simulator traces behaviour of all the passengers one by one and calculates how many passengers get on/off at each station. This information is given to the train traffic simulator and necessary dwell times are calculated. Passengers' dissatisfaction is also estimated from the results of the passenger flow simulation. In the optimization part, we use the tabu search algorithm. We will show the details of our algorithm together with numerical results using real world data. © 2011 Elsevier Ltd.
  • A data management method for efficient search and rendering of multiple large scale point clouds               
    T. Maeno, H. Date, S. Kanai
    International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives, 38, 5, 203, 208, International Society for Photogrammetry and Remote Sensing, 2011年09月03日
    英語, 研究論文(国際会議プロシーディングス), Recently, with the progress of laser scanning technology, it has become possible to scan several environments such as buildings, roads, and cities easily and at a low cost. There are typically three scanning methods: TLS (Terrestrial Laser Scanning), MMS (Mobile Mapping System), and ALS (Airborne Laser Scanning), and the environments are scanned for measurement, modelling, and simulation etc. Therefore, an efficient and comprehensive data management method, which can handle these point clouds in various applications is strongly required. In this paper, we describe a method of data management for efficient search and rendering of multiple large scale point clouds. First, we define a general point cloud file format including the octree and the quantization structure. Next, the data management method enabling an efficient search and rendering of the point clouds is proposed. Finally, the effectiveness of our method is verified using several actual data sets.
  • Pole-like objects recognition from mobile laser scanning data using smoothing and Principal Component Analysis               
    H. Yokoyama, H. Date, S. Kanai, H. Takeda
    International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives, 38, 5, 115, 120, International Society for Photogrammetry and Remote Sensing, 2011年09月03日
    英語, 研究論文(国際会議プロシーディングス), With the spread of the Mobile Laser Scanning (MLS) system, the demands for the management of road and facilities using MLS point clouds have increased. Especially, pole-like objects such as streetlights, utility poles, street signs and etc. are in high demand as facilities to be managed. We propose a method for recognizing pole-like objects from MLS point clouds. Our method is based on Laplacian smoothing using the k-nearest neighbors graph, Principal Component Analysis for recognizing points on pole-like objects, and thresholding for the degree of pole-like objects. Our method can robustly recognize pole-like objects with various radii and tilt angles from MLS point clouds. For correctly segmented objects, accuracy of pole-like object recognition is on average 97.4%.
  • Automatic recognition of a piping system from large-scale terrestrial laser scan data               
    K. Kawashima, S. Kanai, H. Date
    International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives, 38, 5, 283, 288, International Society for Photogrammetry and Remote Sensing, 2011年09月03日
    英語, 研究論文(国際会議プロシーディングス), Recently, changes in plant equipment have been becoming more frequent because of the short lifetime of the products, and constructing 3D shape models of existing plants (as-built models) from large-scale laser scanned data is expected to make their rebuilding processes more efficient. However, the laser scanned data of the existing plant has massive points, captures tangled objects and includes a large amount of noises, so that the manual reconstruction of a 3D model is very time-consuming and costs a lot. Piping systems especially, account for the greatest proportion of plant equipment. Therefore, the purpose of this research was to propose an algorithm which can automatically recognize a piping system from terrestrial laser scan data of the plant equipment. The straight portion of pipes, connecting parts and connection relationship of the piping system can be recognized in this algorithm. Eigenvalue analysis of the point clouds and of the normal vectors allows for the recognition. Using only point clouds, the recognition algorithm can be applied to registered point clouds and can be performed in a fully automatic way. The preliminary results of the recognition for large-scale scanned data from an oil rig plant have shown the effectiveness of the algorithm.
  • デジタルハンドにおける仮想エルゴノミック評価のための指の生体力学モデル構築               
    SHIMIZU Yasutomo, KANAI Satoshi, DATE Hiroaki
    Proceedings of Asian Conference on Design and Digital Engineering 2011, 1, 543, 547, 2011年08月, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • マーカレストラッキングとMRによる情報機器の3次元デジタルプロトタイピング               
    Satoshi Kanai, Hiroaki Date, Keita Uchiyama
    Proceedings of Asian Conference on Design and Digital Engineering 2011, 1, 325, 328, 2011年08月
    英語, 研究論文(国際会議プロシーディングス)
  • CTスキャンされた組立品メッシュ上での部品同定と運動推定
    Tomohiro Mizoguchi, Yoshikazu Kobayashi, Kenji Shirai, Satoshi Kanai
    Proceeding SIGGRAPH '11 ACM SIGGRAPH 2011 Posters, Article No.64, 2011年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), Along with the recent improvements of the industrial X-ray CT scanning systems, it is now possible to non-destructively acquire the entire meshes of mechanical assemblies. This technology has the potential to realize an advanced inspection of assemblies, such as examining assembling errors or dynamic behaviors in motion using the meshes reflecting really-assembled situations. However, to realize such advance inspections, it is required to identify each part and to estimate their motions in the meshes. © 2011 ACM.
  • デジタルハンドによる携帯型機器の単独指操作容易性の推定
    Satoshi Kanai, Seiya Suzuki
    Proceedings of the ASME 2011 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference (IDETC/CIE 2011) (CR-ROM), 2, 897, 905, 2011年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), Ergonomic-conscious design of hand-held information appliances greatly strengthens their competitiveness. However, current ergonomic assessments are carried out in the form of "real" user-tests which need many human subjects and expensive physical mockups, and only subjective evaluations are obtained. To solve these problems, in this paper, the Digital Hand where the 3D bone structure, surface skin geometry of the human hand are imitated was developed for quantitatively estimating the ease of single-fingered operations of hand-held appliances. The ease is estimated based on the reachability of a finger tip to several specified operation target points, and on the finger joint angle margin which reflects the mobile range of motions of all operating fingers' joints. An effective correlation was found between the estimation measures and the subjective comfort ratings in the fingered operations of a SLR camera. © 2011 by ASME.
  • 平滑化と主成分分析による移動レーザスキャンデータからの柱状物体認識
    YOKOYAMA Hiroki, KANAI Satoshi, DATE Hiroaki, TAKEDA Hiroshi
    Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., 38-5, W12, 115, 120, COPERNICUS GESELLSCHAFT MBH, 2011年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), With the spread of the Mobile Laser Scanning (MLS) system, the demands for the management of road and facilities using MLS point clouds have increased. Especially, pole-like objects such as streetlights, utility poles, street signs and etc. are in high demand as facilities to be managed. We propose a method for recognizing pole-like objects from MLS point clouds. Our method is based on Laplacian smoothing using the k-nearest neighbors graph, Principal Component Analysis for recognizing points on pole-like objects, and thresholding for the degree of pole-like objects. Our method can robustly recognize pole-like objects with various radii and tilt angles from MLS point clouds. For correctly segmented objects, accuracy of pole-like object recognition is on average 97.4%.
  • 大規模地上型レーザスキャンデータからの配管系統自動認識
    KAWASHIMA Kazuaki, KANAI Satoshi, DATE Hiroaki
    Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., 38-5, W12, 283, 288, COPERNICUS GESELLSCHAFT MBH, 2011年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), Recently, changes in plant equipment have been becoming more frequent because of the short lifetime of the products, and constructing 3D shape models of existing plants (as-built models) from large-scale laser scanned data is expected to make their rebuilding processes more efficient. However, the laser scanned data of the existing plant has massive points, captures tangled objects and includes a large amount of noises, so that the manual reconstruction of a 3D model is very time-consuming and costs a lot. Piping systems especially, account for the greatest proportion of plant equipment. Therefore, the purpose of this research was to propose an algorithm which can automatically recognize a piping system from terrestrial laser scan data of the plant equipment. The straight portion of pipes, connecting parts and connection relationship of the piping system can be recognized in this algorithm. Eigenvalue analysis of the point clouds and of the normal vectors allows for the recognition. Using only point clouds, the recognition algorithm can be applied to registered point clouds and can be performed in a fully automatic way. The preliminary results of the recognition for large-scale scanned data from an oil rig plant have shown the effectiveness of the algorithm.
  • 複数大規模点群の効率的検索と描画のためのデータ管理手法
    MAENO Takashi, DATE Hiroaki, KANAI Satoshi
    Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., 38-5, W12, 203, 208, COPERNICUS GESELLSCHAFT MBH, 2011年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), Recently, with the progress of laser scanning technology, it has become possible to scan several environments such as buildings, roads, and cities easily and at a low cost. There are typically three scanning methods: TLS (Terrestrial Laser Scanning), MMS (Mobile Mapping System), and ALS (Airborne Laser Scanning), and the environments are scanned for measurement, modelling, and simulation etc. Therefore, an efficient and comprehensive data management method, which can handle these point clouds in various applications is strongly required. In this paper, we describe a method of data management for efficient search and rendering of multiple large scale point clouds. First, we define a general point cloud file format including the octree and the quantization structure. Next, the data management method enabling an efficient search and rendering of the point clouds is proposed. Finally, the effectiveness of our method is verified using several actual data sets.
  • 市街地レーザ計測点群からの柱状物体認識
    横山 博貴, 伊達 宏昭, 金井 理, 武田 浩志
    精密工学会学術講演会講演論文集, 2011, 143, 144, 公益社団法人 精密工学会, 2011年
    モバイルレーザスキャニング(MLS)の普及により,市街地レーザ計測点群を用いた道路やその周辺設備の管理への需要が増加している.特に,電柱や街灯,標識などの柱状物体は,管理対象の設備として需要が高い.そこで本研究では,市街地レーザ計測点群に対して細線化と主成分分析,並びに柱状物体度評価指標を用いて,様々な太さや傾きの柱状物体を自動的に認識できるアルゴリズムを開発し,その認識性能を評価したので報告する.
  • 形状モデルを用いた3次元環境計測データからの対象認識に関する研究:レーザ計測点群に対するスピンイメージを用いた対象認識手法
    金田 脩佑, 伊達 宏昭, 金井 理
    精密工学会学術講演会講演論文集, 2011, 127, 128, 公益社団法人 精密工学会, 2011年
    本研究では,環境内における認識したい対象の存在有無・位置姿勢を,対象の形状モデルを用いて環境のレーザ計測データ(三角形メッシュ)から認識する手法を提案してきた.本報告では,レジストレーションされた計測点群への対象認識の柔軟な適用,ならびに大規模計測データでの対象認識実現のためのデータ量を削減した,三角形メッシュを用いない,レーザ計測点群に対する対象認識手法を提案する.
  • 大規模複数レーザ計測点群の効率的な検索・表示のためのデータ管理手法に関する研究
    前野 峻, 伊達 宏昭, 金井 理
    精密工学会学術講演会講演論文集, 2011, 117, 118, 公益社団法人 精密工学会, 2011年
    近年,地上設置型,車載型,航空機搭載型レーザスキャナによる建物や市街地などの環境の計測を容易に行うことが可能になってきている.本研究ではこれらの計測で得られた大規模複数点群を様々なアプリケーションで効率的,包括的に取り扱うことができるデータ管理手法を提案する.八分木構造を元にした点群データ構造を規定し,大規模複数点群の効率的な検索やLOD表示とそれを可能とするデータ管理手法について述べる.
  • 大規模環境レーザ計測点群からの配管系統の自動認識(第1報):計測点群内からの配管部の自動抽出と接続関係の認識
    川島 千明, 金井 理, 伊達 宏昭
    精密工学会学術講演会講演論文集, 2011, 123, 124, 公益社団法人 精密工学会, 2011年
    近年,レーザ計測点群を利用した,既存プラント設備の実態が反映されたas-built型モデル作成の需要が高まっている.特に,配管系統はプラント設備のモデル化で必須の対象となる.本報では,共分散行列を用いた計測点群全体からの配管系統の計測点群の自動抽出,および,認識した各パイプの径,軸位置・方向に基づくエルボやTジャンクションといった接続要素とパイプ間の接続関係の自動認識を行ったので報告する.
  • 航空機LiDARデータの領域ベース認識分類に関する研究(第3報):地表面および建物領域認識の高精度化
    宇井 宏太朗, 金井 理, 伊達 宏昭, 横尾 泰広, 浅田 典親, 武田 浩志
    精密工学会学術講演会講演論文集, 2011, 129, 130, 公益社団法人 精密工学会, 2011年
    本研究では3次元都市モデリングおよび2次元マッピングのための,航空機LiDARデータからの建物領域の認識を目的としている.本報では,地表面および建物領域認識の高精度化のための,モルフォロジーフィルターを用いた地表面分類と、非地面点領域の境界線形状に基づく建物領域の判定手法を提案し,その分類精度を検証する.
  • Eye-Tracking を用いた情報機器3Dディジタルプロトタイプ上の注視オブジェクト特定に関する研究
    永渕 達也, 金井 理, 伊達 宏昭
    精密工学会学術講演会講演論文集, 2011, 275, 276, 公益社団法人 精密工学会, 2011年
    近年,情報機器開発に際しユーザビリティを考慮したUI設計が求められている.本研究では,これまでユーザーの注視点位置を推定するEye-Trackingシステムの開発と精度の向上を行なってきた.これを用いてUI可動型ディジタルプロトタイプ操作時にユーザーが注視しているUI上の注視オブジェクトの特定を行うことで,誤操作時のUI上の箇所や誤操作原因が推定可能となる.そこで本報告では,Eye-Trackingを用いたディジタルプロトタイプ上注視オブジェクトの特定について報告する.
  • Implementing Deformable Property of Skin in Contact of Digital Hand
    謝 雨来, 金井 理, 伊達 宏昭
    精密工学会学術講演会講演論文集, 2011, 273, 274, 公益社団法人 精密工学会, 2011年
    英語, The virtual ergonomic assessment based on Digital Hand which estimates grasp posture and evaluates the quality of grasp is valuable for hand-held product design, because it can save the cost of test subjects, time, fabricating physical mockups, and it also enables objective evaluation. In this paper, we propose the method to implement deformable property caused by a contact between Digital Hand and the product surface by modeling the fingers as ″quasi-rigid″ objects, by constructing a physical model based on Boussinesq formula which approximates skin contact deformation mechanism, by detecting collision between Digital Hand and a product surface and enlarging the collision area, and then by finally solving Linear Complementarity Problem to resolve the contact and to produce the visible skin surface deformation. The plausible skin deformation could be obtained, because the method preserved the volume of Digital Hand before and after the skin deformation. In addition, utilizing the locality property of the deformation, the method can be easily used by the existing Digital Hand model and do not affect its original scheme of skin deformation caused by bending the finger.
  • Parts identification and motion estimation on CT scanned assembly meshes
    Tomohiro Mizoguchi, Yoshikazu Kobayashi, Kenji Shirai, Satoshi Kanai
    ACM SIGGRAPH 2011 Posters, SIGGRAPH'11, 64, ACM, 2011年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), Along with the recent improvements of the industrial X-ray CT scanning systems, it is now possible to non-destructively acquire the entire meshes of mechanical assemblies. This technology has the potential to realize an advanced inspection of assemblies, such as examining assembling errors or dynamic behaviors in motion using the meshes reflecting really-assembled situations. However, to realize such advance inspections, it is required to identify each part and to estimate their motions in the meshes. © 2011 ACM.
  • タッチパネル付情報機器プロトタイピングのためのXAMLに基づくユーザビリティ評価               
    金井理
    Research in Interactive Design (CD-ROM), 3, PRIDE-P189, 2010年10月, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • デジタルハンドによるエルゴノミック評価のための製品筐体の形状補間               
    ENDO Yui, MIYATA Natsuki, KOUCH Makiko, MOCHIMARU Masaaki, KANAI Satoshi
    Research in Interactive Design (CD-ROM), Springer, 3, PRIDE-P159, 2010年10月, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • 非可視部品と形状特徴の削除による大規模アセンブリモデルの外見保存型単純化操作               
    SAKAMOTO Hideki, KANATANI Naoki
    Research in Interactive Design (CD-ROM), Springer, 3, VC-P144, 2010年10月, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • Constructing MRI-based 3D Precise Human Hand Models for Product Ergonomic Assessments               
    SHIMIZU Yasutomo, KAWAGUCHI Keisuke, KANAI Satoshi
    Proceedings of 2010 Asian Conference on Design and Digital Engineering, 837, 844, 2010年08月, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • 動的計画法と拘束付フィッティングを用いたリバースエンジニアリングのための回転特徴形状認識               
    Kazuaki Kawashima, Satoshi Kanai
    Proceedings of 2010 Asian Conference on Design and Digital Engineering, 612, 619, 2010年08月, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • Physically-based grasp posture generation for virtual ergonomic assessment using digital hand
    Yui Endo, Natsuki Miyata, Makiko Kouchi, Masaaki Mochimaru, Satoshi Kanai
    Advances in Applied Digital Human Modeling, 166, 175, CRC Press, 2010年01月01日
    英語, 論文集(書籍)内論文, Our research purpose is to develop a system for ergonomics design, which enables an ergonomic evaluation for handheld information appliances without “real” subjects and physical mockups by integrating a digital hand with a product model. In this paper, we propose a new method for physically-based grasp posture generation by using a commercial realtime physics engine.
  • 幾何演算に基づくプレス成型金型のスプリングバック見込形状の近似的生成:実成型品測定メッシュと基準形状メッシュの対応関係の構築
    鈴木 邦祐, 村上 幸己, 金井 理
    精密工学会学術講演会講演論文集, 2010, 95, 96, 公益社団法人 精密工学会, 2010年
    成型品のスプリングバック(SB)量も増大に伴い,SBをキャンセルする見込金型形状の作製法について前報まで報告してきた.しかし,SB後の実成型品を測定したメッシュは,基準形状メッシュと位相が異なり,提案する見込形状生成が行えない.そこで本研究では,異なる位相を持ち測地距離不変な変形関係にあるメッシュ間の対応点を見つけ出すアルゴリズムを提案する.
  • Decomposing Scanned Assembly Meshes Based on Periodicity Recognition and Its Application to Kinematic Simulation Modeling
    Tomohiro Mizoguchi, Satoshi Kanai
    ADVANCES IN GEOMETRIC MODELING AND PROCESSING, PROCEEDINGS, 6130, 137, +, SPRINGER-VERLAG BERLIN, 2010年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), Along with the rapid growth of industrial X-ray CT scanning systems, it is now possible to non-destructively acquire the entire meshes of assemblies consisting of a set of parts. For the advanced inspections of the assemblies, such as estimation of their assembling errors or examinations of their behaviors in the motions, based on their CT scanned meshes, it is necessary to accurately decompose the mesh and to extract a set of partial meshes each of which correspond to a part. Moreover it is required to create models which can be used for the real-product based simulations. in this paper, we focus on CT scanned meshes of gear assemblies as examples and propose beneficial methods for establishing such advance inspections of the assemblies. We first propose a method that accurately decomposes the mesh into partial meshes each of which corresponds to a gear based on periodicity recognitions. The key idea is first to accurately recognize the periodicity of each gear and then to extract the partial meshes as sets of topologically connected mesh elements where periodicities are valid. Our method can robustly and accurately recognize periodicities from noisy scanned meshes. In contrast to previous methods, our method can deal with single-material CT scanned meshes and can estimate the correct boundaries of neighboring parts with no previous knowledge. Moreover it can efficiently extract the partial meshes from large scanned meshes containing about one million triangles in a few minutes. We also propose a method for creating simulation models which can be used for a gear teeth contact evaluation using extracted partial meshes and their periodicities. Such an evaluation of teeth contacts is one of the most important functions in kinematic simulations of gear assemblies for predicting the power transmission efficiency, noise and vibration. We demonstrate the effectiveness of our method on a variety of artificial and CT scanned meshes.
  • Process Planning System for an MEMS Device using a 3D Geometric Model               
    Tomonao KITAHARA, Satoshi KANAI, Takayuki SHIBATA, Takahiro KAWASHIMA
    Proceedings of Asian Symposium for Precision Engineering and Nanotechnology 2009 (ASPEN 2009), 2E11, 2009年11月, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • 3D Shape Retrieval considering Assembly Structure               
    KANAI Satoshi, MIURA Takashi
    Proceedings of Asian Symposium for Precision Engineering and Nanotechnology 2009 (ASPEN 2009), 1A1-15, 2009年11月, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • 仮想エルゴノミック評価のための最適化に基づく把持姿勢生成手法
    ENDO Yui, KANAI Satoshi, KISINAMI Takeshi, MIYATA Natsuki, MOCHIMARU Masaaki
    SAE International Journal of Passenger Cars -Electronic and Electrical Systems, 1, 1, 590, 598, 2009年04月, [査読有り], [招待有り]
    英語, 研究論文(学術雑誌)
  • ICPとリージョングローイングを組み合わせた機械部品計測メッシュのユークリッド対称性認識手法
    溝口知広, 金井理
    精密工学会誌, 75, 4, 554, 560, 公益社団法人 精密工学会, 2009年04月, [査読有り]
    日本語, 研究論文(学術雑誌), Recently scanned meshes from mechanical objects can be easily acquired using high-energy industrial X-ray CT scanning technologies, and these meshes are widely used in various fields of product developments. Mechanical objects often exhibit symmetries for their functionality. They are originally defined by creating a copy of the solid and then by placing it with a certain transformation including an arbitrary set of translations, rotations, and reflections. Therefore it is desired to detect such symmetries from the scanned meshes for their effective use in mesh applications, such as reconstruction of CAD models with compact data representations or CAE mesh enhancement using the symmetries. In this paper, we propose a method that can detects multiple Euclidean symmetries from scanned meshes of mechanical objects based on a combination of ICP and region growing algorithms. We define Euclidean symmetries detection as to detect both pairs of regions that match under certain transformations and their transformations including arbitrary sets of translations, rotations, and reflections. We also propose a method that derives all possible sequences for reconstructing an entire model from the original mesh using planar-reflective symmetries among all the detected symmetries, and represents them in an AND/OR graph in order to compactly represent the mesh. Our proposed method contains several advantages. It can robustly detect symmetries from noisy scanned meshes that include many planar regions. Our method also can detect both global and local Euclidean symmetries from meshes. Moreover it can detect maximally large pairs of regions under user specified tolerances. We demonstrate the effectiveness of the proposed method from various experiments using X-ray CT scanned meshes of mechanical objects.
  • Flexible Control of Multimaterial Tetrahedral Mesh Properties by Using Multiresolution Techniques
    Hiroaki Date, So Noguchi, Masahiko Onosato, Satoshi Kanai
    IEEE TRANSACTIONS ON MAGNETICS, 45, 3, 1352, 1355, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2009年03月, [査読有り]
    英語, 研究論文(学術雑誌), This paper describes a method for flexibly controlling the properties of a given multimaterial tetrahedral mesh for finite-element analysis. Our method is based on multiresolution techniques. A given mesh is first subdivided and then simplified so that the resulting mesh satisfies the user-specified thresholds for mesh properties (element size, shape, valence, and geometric tolerance). Once the simplification is completed, mesh resolution and density can be modified quickly by using level of detail.
  • APPLYING USER INTERFACE-OPERABLE 3D DIGITAL PROTOTYPES TO HUMAN-CENTERED DESIGN OF INFORMATION APPLIANCES
    Satoshi Kanai, Taiga Higuchi, Yukiaki Kikuta
    DETC 2008: PROCEEDINGS OF THE ASME INTERNATIONAL DESIGN ENGINEERING TECHNICAL CONFERENCES AND COMPUTERS AND INFORMATIONAL IN ENGINEERING CONFERENCE, VOL 3, PTS A AND B, 867, 876, AMER SOC MECHANICAL ENGINEERS, 2009年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), One of the critical issues of realizing human centered design (HCD) for information appliances is how to efficiently find the weakness of usability of the user interfaces (UI). At present, user test is the most reliable method of evaluating usability of UI. But executing user-test costs much due to fabrication of physical prototypes, securing of test subjects and facilities and the manual-based analysis of the test results. To solve the problems, we propose a computer-supported environment for testing and usability assessment for human centered-design of information appliances in the paper. In the environment, UI-operable 3D digital prototypes can be designed and used for user tests instead of physical prototypes, and the test results can be automatically analyzed to clarify the weak points of the UI design. UI-operable 3D digital prototypes can be modeled by integrating the state-transition-based UI behavior model with 3D CAD models of the housings. A function of graphically displaying user's operational history helps the designers identify which portions in the UI specification induce wrong operations of users. A function of indicating digital questionnaire based on cognitive walkthrough method also enables them to reveal causes of the wrong operations and to clarify point of redesign. Comparison of the test results using different types of digital prototypes showed that the proposed UI-operable 3D digital prototype could fully replace the physical prototype in early design stage.
  • 3D digital prototyping and usability enhancement of information appliances based on UsiXML
    Satoshi Kanai, Taiga Higuchi, Yukiaki Kikuta
    International Journal on Interactive Design and Manufacturing, 3, 3, 201, 222, 2009年, [査読有り]
    英語, 研究論文(学術雑誌), Recently, usability assessment of user interfaces (UIs) in the early design stage has become indispensable for the human-centered design of information appliances. Several digital prototyping tools of the UI software, in which the UI behavior can be simulated, have been developed so far. However, some problems can arise when using them for the usability assessment, such as: a lack of simulation fidelity, time-consuming modeling work, and lack of systematic usability assessment functions. To solve these problems, we developed a tool for virtual 3D prototyping and usability assessment of information appliances. First, we extended the specification of UsiXML (which is the XML-compliant UI description language) so that the static structure both of the logical elements displayed on the UI and of the physical elements placed on the housings can be modeled. Secondly, we developed 3D prototyping and simulation functions so that the extended UsiXML is combined with the 3D CAD models of the housings and where the interaction can be simulated based on the dynamic-behavior model of the UsiXML. Finally, we developed the automated user test and usability assessment functions which are connected to the models of the extended UsiXML. An example of the efficient usability assessment and the UI redesign using a 3D digital prototype of a digital camera is shown. © Springer-Verlag 2009.
  • Database-Driven Grasp Synthesis and Ergonomic Assessment for Handheld Product Design
    Keisuke Kawaguchi, Yui Endo, Satoshi Kanai
    DIGITAL HUMAN MODELING, PROCEEDINGS, 5620, 642, 652, SPRINGER-VERLAG BERLIN, 2009年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), Recently, simulation-based ergonomic assessments for handheld products, such as mobile phones, have seen a growing interest and have been increasingly studied. In these studies, the combination of 3D product models and "digital hands", which are a parametric 3D models of human hands, have been used. One of the keys to the ergonomic assessment using the digital hand is the "grasp synthesis" where plausible grasp postures for the product model have to be generated. In this paper, we propose a new database-driven grasp synthesis method considering the geometric constraints of grasping handheld products. The proposed method can generate more plausible grasp postures for handheld products in easier interactions than those of previous ones.
  • デジタルハンドとプロダクトモデルとの統合によるエルゴノミック評価システムの開発(第2報)把持容易性評価機能および把持姿勢の最適化手法
    遠藤維, 金井理, 岸浪建史, 宮田なつき, 河内まき子, 持丸正明
    精密工学会誌, 75, 4, 548, 553, Japan Society for Precision Engineering, 2009年, [査読有り]
    日本語, 研究論文(学術雑誌)
  • APPLYING USER INTERFACE-OPERABLE 3D DIGITAL PROTOTYPES TO HUMAN-CENTERED DESIGN OF INFORMATION APPLIANCES
    Satoshi Kanai, Taiga Higuchi, Yukiaki Kikuta
    DETC 2008: PROCEEDINGS OF THE ASME INTERNATIONAL DESIGN ENGINEERING TECHNICAL CONFERENCES AND COMPUTERS AND INFORMATIONAL IN ENGINEERING CONFERENCE, VOL 3, PTS A AND B, 867, 876, AMER SOC MECHANICAL ENGINEERS, 2009年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), One of the critical issues of realizing human centered design (HCD) for information appliances is how to efficiently find the weakness of usability of the user interfaces (UI). At present, user test is the most reliable method of evaluating usability of UI. But executing user-test costs much due to fabrication of physical prototypes, securing of test subjects and facilities and the manual-based analysis of the test results. To solve the problems, we propose a computer-supported environment for testing and usability assessment for human centered-design of information appliances in the paper. In the environment, UI-operable 3D digital prototypes can be designed and used for user tests instead of physical prototypes, and the test results can be automatically analyzed to clarify the weak points of the UI design. UI-operable 3D digital prototypes can be modeled by integrating the state-transition-based UI behavior model with 3D CAD models of the housings. A function of graphically displaying user's operational history helps the designers identify which portions in the UI specification induce wrong operations of users. A function of indicating digital questionnaire based on cognitive walkthrough method also enables them to reveal causes of the wrong operations and to clarify point of redesign. Comparison of the test results using different types of digital prototypes showed that the proposed UI-operable 3D digital prototype could fully replace the physical prototype in early design stage.
  • AN OPTIMIZATION-BASED APPROACH FOR GRASP POSTURE GENERATION OF DIGITAL HAND
    Yui Endo, Satoshi Kanai, Natsuki Miyata, Makiko Kouchi, Masaaki Mochimaru, Jun Konno, Michiyo Ogasawara, Marie Shimokawa
    DETC 2008: PROCEEDINGS OF THE ASME INTERNATIONAL DESIGN ENGINEERING TECHNICAL CONFERENCES AND COMPUTERS AND INFORMATIONAL IN ENGINEERING CONFERENCE, VOL 3, PTS A AND B, 877, 885, AMER SOC MECHANICAL ENGINEERS, 2009年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), Recently, as handheld information appliances, such as mobile phones, PDAs, have widely spread, the development of these appliances should pay more attention in their ergonomic design. However, the user tests for developing the "ergonomic" appliances are usually done by many real subjects testing a variety of these physical mockups, and the process of these tests usually requires the expensive cost and has to take a long time. So, we propose a software system of an automatic ergonomic assessment system for designing handheld information appliances by integrating the digital hand model with the 3D product model of the appliance. Our system has the following four feature functions for ergonomic assessment: 1) Generation of kinematically and geometrically accurate digital hand models with rich dimensional variation, 2) automatic grasp posture generation and evaluation of the posture stability by estimating the force-closure and the grasp quality, 3) automatic evaluation of ease of the finger motion in operating the user interface, 4) aiding the designers to re-design the housing shapes and user-interfaces in the product model. In this paper we propose a new optimization-based method the 2) of the above functions. As the objective function, we use the number of the contact points, the fit of the specific part of the hand surface for the feature edges of the product surface and the margin for the constraints on the joint angle limits of the figures. The experimental studies on the grasp posture generation for the digital camera indicate that more realistic grasp posture could be generated using the proposed optimization-based method than the one using our former method.
  • EUCLIDEAN SYMMETRY DETECTION FROM SCANNED MESHES BASED ON A COMBINATION OF ICP AND REGION GROWING ALGORITHMS
    Tomohiro Mizoguchi, Satoshi Kanai
    DETC 2008: PROCEEDINGS OF THE ASME INTERNATIONAL DESIGN ENGINEERING TECHNICAL CONFERENCES AND COMPUTERS AND INFORMATION IN ENGINEERING CONFERENCE, VOL 1, PTS A AND B, 683, 691, AMER SOC MECHANICAL ENGINEERS, 2009年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), Recently, meshes of engineering objects have been easily acquired by 3D laser or high-energy industrial X-ray CT scanning systems and they are widely used in product developments. For the effective use of scanned meshes in inspection, re-design, and simulation of the objects, it is important to reconstruct CAD models from the meshes. Engineering objects often exhibit Euclidean symmetries for their functionalities. Therefore, it is essential to detect such symmetries when reconstructing CAD models with compact data representations which are similar to the ones already defined in CAD systems. However, existing methods for reconstructing CAD models have not focused on detecting such symmetries. In this paper, we propose a new method that detects partial or global Euclidean symmetries, including translation, rotation, and reflection, from scanned meshes of engineering objects based on the combination of the ICP and the region growing algorithms. Our method can robustly and efficiently extract pairs of symmetric regions and their transformations under which the pair can be closely matched to each other. We demonstrate the effectiveness of the proposed method from experiments on various scanned meshes.
  • Recognizing Periodicities on 3D Scanned Meshes Based on Indexed-ICP Algorithm               
    Research in Interactive Design (CD-ROM), 3, IDMME_P35, 2008年
  • XAML-based 2D/3D Prototyping System for Rapid Development of Information Appliances               
    Research in Interactive Design (CD-ROM), 3, APIAHD_P127, 2008年
  • Plausible Digital Hand Grasp Synthesis considering the Grasp Constratins of Information Appliances               
    Research in Interactive Design (CD-ROM), 3, Virtual Concept_P34, 2008年
  • Euclidean symmetry detection from scanned meshes based on a conbination of ICP and region growing algorithms
    Tomohiro Mizoguchi, Satoshi Kanai
    Proceedings of the ASME Design Engineering Technical Conference, 1, 683, 691, 2008年
    英語, 研究論文(国際会議プロシーディングス), Recently, meshes of engineering objects have been easily acquired by 3D laser or high-energy industrial X-ray CT scanning systems and they are widely used in product developments. For the effective use of scanned meshes in inspection, re-design, and simulation of the objects, it is important to reconstruct CAD models from the meshes. Engineering objects often exhibit Euclidean symmetries for their functionalities. Therefore, it is essential to detect such symmetries when reconstructing CAD models with compact data representations which are similar to the ones already defined in CAD systems. However, existing methods for reconstructing CAD models have not focused on detecting such symmetries. In this paper, we propose a new method that detects partial or global Euclidean symmetries, including translation, rotation, and reflection, from scanned meshes of engineering objects based on the combination of the ICP and the region growing algorithms. Our method can robustly and efficiently extract pairs of symmetric regions and their transformations under which the pair can be closely matched to each other. We demonstrate the effectiveness of the proposed method from experiments on various scanned meshes. Copyright © 2008 by ASME.
  • Content-based 3D Mesh Model Retrieval from Hand-written Sketch               
    International Journal on Interactive Design and Manufacturing, 2, 2, 87, 98, 2008年
  • 分散制御システムの並列離散事象シミュレーションのためのオブジェクト指向デザインパターンに関する研究
    戸村 豊明, 金井 理
    精密工学会誌, 74, 3, 306, 312, 公益社団法人精密工学会, 2008年
    日本語, Distributed control systems(DCS) consist of many sensors/actuators and a network interconnecting them, and are being introduced in various automation areas. For assuring the control performance of a DCS under heavy communication traffic, the precise simulation of the DCS is strongly needed. For this purpose, we propose a uniform, efficient and systematic method based on object-oriented design patterns for modeling and simulating DCSs. In this paper, two design patterns are newly proposed; Time-Warp pattern and Protocol pattern. Time-Warp pattern describes classes and interaction for executing the DCS simulation by communicating events having send/receive times, using Time Warp mechanism. Protocol pattern describes classes and interaction for uniformly structuring various communication protocol models used in DCSs, which are composed of the interactions among several layers and the state transition of each layer in a communication protocol. Finally, the effectiveness of the DCS simulator which is developed using these patterns was proved by comparing simulation results with the experiment results using the real DCS consisting of four CAN-based control nodes.
  • Region Growing/Mergingを用いた効率的なメッシュセグメンテーション
    溝口 知広, 伊達 宏昭, 金井 理
    精密工学会誌, 74, 7, 752, 759, 公益社団法人精密工学会, 2008年
    日本語, To effectively use scanned meshes obtained by 3D laser scanner or X-ray CT scanning systems in engineering applications, such as inspection and CAD model reconstruction, we need to segment meshes and extract desirable regions and their approximating surfaces. Surfaces of engineering objects are commonly represented by a set of analytic surfaces, such as planes, cylinders, spheres, cones. Therefore, the mesh surface of them needs to be approximated by a set of analytic surfaces. In this paper we propose an efficient mesh segmentation algorithm based on region growing and region merging. Our algorithm first robustly and accurately estimates mesh principal curvatures using the two-pass estimation method. Then it fast extracts regions and their approximating analytic surfaces based on region growing even if regions are smoothly blended. Finally it efficiently merges initial set of regions of large and complex scanned meshes under the user specified tolerances using region merging. We demonstrate the efficiency and accuracy of our algorithm with scanned meshes acquired from real engineering objects by X-ray CT scanning systems.
  • 分散制御システムの並列離散事象シミュレーションのためのオブジェクト指向デザインパターンに関する研究
    戸村 豊明, 金井 理
    精密工学会誌, 74, 3, 306, 312, 公益社団法人精密工学会, 2008年, [査読有り]
    日本語, 研究論文(学術雑誌), Distributed control systems(DCS) consist of many sensors/actuators and a network interconnecting them, and are being introduced in various automation areas. For assuring the control performance of a DCS under heavy communication traffic, the precise simulation of the DCS is strongly needed. For this purpose, we propose a uniform, efficient and systematic method based on object-oriented design patterns for modeling and simulating DCSs. In this paper, two design patterns are newly proposed; Time-Warp pattern and Protocol pattern. Time-Warp pattern describes classes and interaction for executing the DCS simulation by communicating events having send/receive times, using Time Warp mechanism. Protocol pattern describes classes and interaction for uniformly structuring various communication protocol models used in DCSs, which are composed of the interactions among several layers and the state transition of each layer in a communication protocol. Finally, the effectiveness of the DCS simulator which is developed using these patterns was proved by comparing simulation results with the experiment results using the real DCS consisting of four CAN-based control nodes.
  • Region Growing/Mergingを用いた効率的なメッシュセグメンテーション
    溝口 知広, 伊達 宏昭, 金井 理
    精密工学会誌, 74, 7, 752, 759, 公益社団法人精密工学会, 2008年, [査読有り]
    日本語, 研究論文(学術雑誌), To effectively use scanned meshes obtained by 3D laser scanner or X-ray CT scanning systems in engineering applications, such as inspection and CAD model reconstruction, we need to segment meshes and extract desirable regions and their approximating surfaces. Surfaces of engineering objects are commonly represented by a set of analytic surfaces, such as planes, cylinders, spheres, cones. Therefore, the mesh surface of them needs to be approximated by a set of analytic surfaces. In this paper we propose an efficient mesh segmentation algorithm based on region growing and region merging. Our algorithm first robustly and accurately estimates mesh principal curvatures using the two-pass estimation method. Then it fast extracts regions and their approximating analytic surfaces based on region growing even if regions are smoothly blended. Finally it efficiently merges initial set of regions of large and complex scanned meshes under the user specified tolerances using region merging. We demonstrate the efficiency and accuracy of our algorithm with scanned meshes acquired from real engineering objects by X-ray CT scanning systems.
  • デジタルハンドとプロダクトモデルとの統合によるエルゴノミック評価システムの開発(第1報) : 製品の把持安定性仮想評価機能
    遠藤 維, 金井 理, 岸浪 建史, 宮田 なつき, 河内 まき子, 持丸 正明
    精密工学会誌, 74, 2, 182, 187, 公益社団法人精密工学会, 2008年, [査読有り]
    日本語, 研究論文(学術雑誌), The purpose of this research is to develop a system that can evaluate stability and ease of a person grasping products such as digital cameras without real subjects and physical mockups. In the system, we integrate 3D digital hand models with the 3D CAD models of the product to realize the virtual ergonomic assessment. The system features are the following; i) Geometrically accurate 3D digital hand models with rich Japanese size varieties are used for the assessment, ii) A semi-automatic grasp planning function is installed to efficiently find appropriate grasp posture for the exterior housings geometries of appliances, and iii) "Force-closure" and the "grasp quality" indices can quantitatively evaluate grasp stability for the product.
  • Development of a production information management system to support environmental CSR activities for process production
    Takafumi Shimizu, Satoshi Kanai, Masayuki Ichinohe, Toshijiro Ohashi, Yasuo Nakagawa
    DETC2007: PROCEEDINGS OF THE ASME INTERNATIONAL DESIGN ENGINEERING TECHNOLOGY CONFERENCE AND COMPUTERS AND INFORMATION IN ENGINEERING CONFERENCE, VOL 4, 819, 828, AMER SOC MECHANICAL ENGINEERS, 2008年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), Recently, awareness of Corporate Social Responsibility (CSR) has been raised and various environmental regulations have spread in many countries. Under this situation, manufacturers of process production, production information management systems are required that can archive and retrieve data not only of final products and raw materials but of chemical substances contained, intermediate products and wastes generated, and energy consumption during the production. However, management systems and product models currently used for assembly production do not fit the above requirement. To solve the problem, first, an object-oriented process-product model was designed which can represent these data and can be easily implemented on commercial ORDBMS. Second, traceability functions of explosion and implosion covering chemical substances, intermediate products, wastes and energy were developed on the ORDBMS. Third, a generic environmental law model was designed which can represent restrictions of various environmental regulations in a uniform way. Finally, a conformance checking function for environmental regulations was developed by combining the generic environmental law model with the process-product model. The effectiveness of the models and functions was verified by applying them to full-scale production data of functional polymer films and checking its conformance to RoHS and EuP directives.
  • Quasi-optimal mesh segmentation via region growing/merging
    Tomohiro Mizoguchi, Hiroaki Date, Satoshi Kanai, Takeshi Kishinami
    PROCEEDINGS OF THE ASME INTERNATIONAL DESIGN ENGINEERING TECHNICAL CONFERENCES AND COMPUTERS AND INFORMATION IN ENGINEERING CONFERENCE 2007, VOL 6, PTS A AND B, 547, 556, AMER SOC MECHANICAL ENGINEERS, 2008年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), Recently meshes of engineering objects are easily acquired by 3D laser or high energy X-ray CT scanning systems, and these meshes are widely used in product developments. To effectively use scanned meshes in engineering applications, such as inspection, CAD model reconstruction, and convergent-type CAE, we need to segment meshes and extract desirable regions and their approximating surfaces as preprocessing. Engineering objects are commonly represented as a set of analytic surfaces, such as planes, cylinders, spheres, cones, and tori. Therefore, the mesh surface of engineering objects needs to be approximated as a set of analytic surfaces. Moreover, a mesh surface should be approximated with a minimum number of analytic surfaces and their approximating error should be minimized as a result of segmentation. We call the segmentation that satisfies these two conditions the optimal segmentation as proposed in [1]. However, optimal segmentation algorithms need a long calculation time. Today's high energy X-ray CT scanning systems generate large meshes with millions of triangles from objects including hundreds of regions. Thus, computationally expensive algorithms, such as [1], cannot be directly applied to these large and complex meshes from the aspect of efficiency.
    In this paper we propose an efficient new quasi-optimal mesh segmentation algorithm via region growing and region merging. First, our algorithm robustly and accurately estimates mesh principal curvatures using the local surface fitting by two-pass algorithm. Second, it uses the curvatures to appropriately create seed regions, and then it quickly grows each seed region and extracts grown regions and their approximating analytic surfaces from a whole mesh. Finally, our region merging algorithm efficiently merges extracted regions in order to minimize the number of regions while keeping the user specified tolerances of the surface fitting, and it results in quasi-optimal segmentation.
    We demonstrate the performance of our algorithm with scanned meshes acquired from real engineering objects by 3D laser and X-ray CT scanning systems.
  • 任意形状凸多面体に対する重心座標を用いたメッシュモデルの形状変形に関する研究
    水野 学, 伊達宏昭, 金井理, 岸浪建史
    精密工学会誌, 73, 3, 383, 388, 公益社団法人精密工学会, 2007年03月, [査読有り]
    日本語, 研究論文(学術雑誌), In this paper, we present a parametric deformation method for mesh models based on barycentric coordinates for convex polytope. First, we propose a FFD (free-form deformation)based on barycentric coordinates. Arbitrary convex polytope can be used for the deformation handle of the FFD. Next, we propose an automatic handle construction method for the FFD based on definition and classification of deformation types. Deformation handles suitable for user intended deformation types can be automatically constructed by selecting the deformation type and model portions to be deformed. Finally, we propose a parametric handle deformation method driven by the affine transformation. In our method, user can deform the model by selecting deformation type, portions to be deformed, and by manipulating one or two deformation parameters. Moreover, we propose a method for preserving approximated geometric continuity at the boundary between deformed portions and non-deformed portions of the models. For this purpose, we impose geometric constrains derived from analysis of derivatives of barycentric coordinates on the deformation handle for each deformation type.
  • Virtual ergonomic assessment on handheld products based on virtual grasping by digital hand
    Endo, Y., Kanai, S., Kishinami, T., Miyata, N., Kouchi, M., Mochimaru, M.
    SAE Technical Papers, 2007-01-2511, 2007年
    研究論文(学術雑誌)
  • Development of a Production Information Management System to Support Environmental CSR Activities for Process Production               
    Proceedings of ASME 2007 Design Engineering Technical Conferences and Computers and Information in Engineering Conference (CD-ROM), DETC2007-35316, 2007年
  • Quasi-Optimal Mesh Segmentation via Region Growing/Merging               
    Proceedings of ASME 2007 Design Engineering Technical Conferences and Computers and Information in Engineering Conference (CD-ROM), DETC2007-35171, 2007年
  • A multi-disciplinary distributed simulation environment for mechatronic system design enabling hardware-in-the-loop simulation based on HLA               
    International Journal on Interactive Design and Manufacturing, 1, 3, 175, 179, 2007年
  • Virtual ergonomic assessment on handheld products based on virtual grasping by digital hand
    Endo, Y., Kanai, S., Kishinami, T., Miyata, N., Kouchi, M., Mochimaru, M.
    SAE Technical Papers, 116, 7, 877, 887, 2007年
    研究論文(学術雑誌)
  • 任意形状凸多面体に対する重心座標を用いたメッシュモデルの形状変形に関する研究
    水野 学, 伊達 宏昭, 金井 理, 岸浪 建史
    精密工学会誌, 73, 3, 383, 388, 公益社団法人精密工学会, 2007年
    日本語, In this paper, we present a parametric deformation method for mesh models based on barycentric coordinates for convex polytope. First, we propose a FFD (free-form deformation)based on barycentric coordinates. Arbitrary convex polytope can be used for the deformation handle of the FFD. Next, we propose an automatic handle construction method for the FFD based on definition and classification of deformation types. Deformation handles suitable for user intended deformation types can be automatically constructed by selecting the deformation type and model portions to be deformed. Finally, we propose a parametric handle deformation method driven by the affine transformation. In our method, user can deform the model by selecting deformation type, portions to be deformed, and by manipulating one or two deformation parameters. Moreover, we propose a method for preserving approximated geometric continuity at the boundary between deformed portions and non-deformed portions of the models. For this purpose, we impose geometric constrains derived from analysis of derivatives of barycentric coordinates on the deformation handle for each deformation type.
  • Virtual grasping assessment using 3D digital hand model               
    Yui Endo, Satoshi Kanai, Takeshi Kishinami, Natsuki Miyata, Makiko Kouchi, Masaaki Mochimaru
    10th Annual Applied Ergonomics Conference: Celebrating the Past - Shaping the Future, 2007年
    英語, 研究論文(国際会議プロシーディングス), The purpose of this research is to develop a simulator which can evaluate stability and ease of human's grasping handheld information appliancessuch as digital cameras without real subjects and physical mockups. In the simulator, we integrate 3D digital hand models with the 3D CAD models of the appliance to realize the virtual grasping assessment. The features of the simulator are that 1) geometrically accurate 3D digital hand models with rich Japanese size varieties are used for the assessment, 2) a semi-automatic grasp planning function is installed to efficiently find appropriate grasp posture for the exterior housings geometries of appliances, 3) stability of grasping can be quantitatively evaluated based on the "force-closure" and the "grasp quality" indices, and 4) ease of grasping can be qualitatively evaluated based on "comfort database" constructed from the PCA for measurements of finger joint angles of real subject's.
  • A computer-aided ergonomic assessment and product design system using digital hands
    Endo, Y., Kanai, S., Kishinami, T., Miyata, N., Kouchi, M., Mochimaru, M.
    Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), 4561 LNCS, 833, 842, Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), 2007年, [査読有り]
    研究論文(学術雑誌)
  • An integrated environment for testing and assessing the usability of information appliances using digital and physical mock-ups
    Satoshi Kanai, Soh Horiuchi, Yukiaki Kikuta, Akihiko Yokoyama, Yoshiyuki Shiroma
    VIRTUAL REALITY, PROCEEDINGS, 4563, 478, +, SPRINGER-VERLAG BERLIN, 2007年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), Executing user-test of information appliances costs much due to fabrication of physical functional mockups, the securing of human subjects for the test, and preparation of testing facilities. Results of the user test have to be manually analyzed by usability engineers, and the analysis takes a couple of weeks. In this paper, we propose an integrated software and hardware environment for prototyping and assessing usability of information appliances where the users can operate a user-interface either of a 2D digital mockup or 3D digital mockup or a physical-mockup of the appliance under the test. This function enables engineers to test and evaluate the usability of the appliances both from the cognitive aspect and from the physical aspects.
  • Effects of olmesartan, an AT1 receptor antagonist, on hypoxia-induced activation of ERK1/2 and pro-inflammatory signals in the mouse lung
    Yoshiyuki Tanabe, Yuki Morikawa, Takao Kato, Satoshi Kanai, Taichi Watakabe, Ami Nishijima, Hijiri Iwata, Kaori Isobe, Mayumi Ishizaki, Koichi Nakayama
    NAUNYN-SCHMIEDEBERGS ARCHIVES OF PHARMACOLOGY, 374, 3, 235, 248, SPRINGER, 2006年12月
    英語, 研究論文(学術雑誌), The present study aimed to investigate the effects of olmesartan, an antagonist for angiotensin II receptor type 1(AT1), on the activation of extracellular signal-regulated kinases (ERK)1/2, tissue remodeling, and pro-inflammatory signals in the right ventricle and lung of mice during the early phase of hypobaric hypoxia. Phosphorylation of ERK1/2 in both tissue types in response to hypoxia peaked at 1-3 days, and declined rapidly in the right ventricle, whereas in the lung it was sustained for at least 8 days. Upregulation of angiotensinogen mRNA was observed in the hypoxic lung at 4-9 days, but not in the hypoxic right ventricle and pulmonary artery. Olmesartan inhibited the hypoxia-induced phosphorylation of ERK1/2 in the lung, but not in the right ventricle. Neither right ventricular hypertrophy nor the thickening of the intrapulmonary arterial wall was ameliorated by olmesartan. However, this drug inhibited the expression of the mRNA for angiotensinogen and several pro-inflammatory factors, including interleukin-6 and inducible nitric oxide synthase in the hypoxic lung. These results suggest that olmesartan blocks a potential positive feedback loop of the angiotensin II-AT1 receptor system, which may lead to attenuate pro-inflammatory signals in the mouse lung, that are associated with hypoxic pulmonary hypertension, without inducing any appreciable effects on the compensatory cardiopulmonary hypertrophy at an early phase of exposure to a hypobaric hypoxic environment.
  • Digital hand and virtual ergonomic assessment simulator for styling design               
    Research in Interactive Design, 2, HUCED-1, 2006年
  • Digital Usability Assessment for Information Appliances using User-Interface operable 3D Digital Mock-up               
    Research in Interactive Design, 2, HUCEID-P235, 2006年
  • An ergonomic assessment system using a digital hand for designing handheld information appliances               
    Proceedings of ASME 2006 Design Engineering Technical Conferences and Computers and Information in Engineering Conference (CD-ROM), 1, 1, DETC2006-99114, 2006年
  • A Parametric Deformation Method for Mesh Models based on Barycentric Coordinates               
    Proceedings of Visualization Imaging and Image Processing 2006 (CD-ROM), 359, 364, 2006年
  • Flexible Feature and Resolution Control of Triangular Meshes
    DATE H.
    Proceedings of Visualization Imaging and Image Processing 2006 (CD-ROM), 319, 319, 324, 2006年
  • Mesh Simplification and Adaptive LOD for Finite Element mesh Generation               
    International Journal of CAD/CAM, 6, 1, No.8, 2006年
  • A parametric deformation for mesh models based on barycentric coordinates               
    Gaku Mizuno, Hiroaki Date, Satoshi Kanai, Takeshi Kishinami
    Proceedings of the 6th IASTED International Conference on Visualization, Imaging, and Image Processing, VIIP 2006, 359, 364, 2006年
    英語, 研究論文(国際会議プロシーディングス), Free-Form Deformation (FFD) [1] is a popular method for deforming 3D geometric models. FFD first embeds the model in the regular lattice (handle). Then by deforming the handle, the embedded model is deformed. However, FFD has the following problems for engineering applications: 1) it is difficult to make the handle suitable for the user-intended deformation type such as bend and twist, 2) it requires complicated manipulation, and 3) it cannot produce deformations precisely because the degree of deformation such as the angle of bend cannot be specified explicitly. Therefore, in order to solve these problems, we propose a parametric deformation method for mesh models. First, we propose an FFD based on barycentric coordinates (BCFFD) for a convex polytope. Second, we propose an automatic handle construction method for the BCFFD based on definition and classification of deformation types such as bend, twist, and so on. Third, we propose a parametric deformation method based on BCFFD. Finally, we derive constraints for the handle that preserve geometric continuity at boundary between the deformed and non-deformed portion of the model. Using our methods, the user can deform the mesh model by selecting the deformation type and portions to be deformed, and by manipulating deformation parameters.
  • 有限要素解析のための多重解像度メッシュモデリングに関する研究:連結要素挿入と単純化によるメッシュ結合手法とその応用
    伊達 宏昭, 金井 理, 西垣 一朗, 小野里 雅彦
    精密工学会学術講演会講演論文集, 2006, 41, 42, 一般社団法人日本機械学会, 2006年
    本研究では,CAE効率化において要求されるメッシュベースのアセンブリモデル生成や解析条件設定を目的としたメッシュ結合手法を前報にて提案した.提案手法は,2つのメッシュ表面間に連結要素を挿入し,それを単純化することでメッシュを面と面で結合するものである.本報では,既提案手法を拡張した,線と線,線と面といった様々なタイプのメッシュ間の結合手法を提案し,具体的な例題への適用によりその有効性を示す.
  • An application of a digital hand to ergonomic assessment of handheld information appliances
    Endo, Y., Kanai, S., Kishinami, T., Miyata, N., Kouchi, M., Mochimaru, M.
    SAE Technical Papers, 2006年, [査読有り]
    研究論文(学術雑誌)
  • A multiresolution mesh processing system for efficient CAE
    Hiroaki Date, Satoshi Kanai, Takeshi Kishinami, Ichiro Nishigaki
    2006 SICE-ICASE INTERNATIONAL JOINT CONFERENCE, VOLS 1-13, 3685, +, IEEE, 2006年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), With the progress of 3D scanning technology and storing mesh data to 3D model databases, the use of the meshes obtained by scanning and DB querying in CAE have been strongly required in addition to those obtained from traditional meshing of solid models. In our research, we developed a multiresolution mesh processing system for triangular meshes to realize CAE using various kinds of meshes. Our system consists of three functions based on the multiresolution techniques: mesh quality improvement, mesh properties control, and local mesh density control. This paper describes these functions including the extension for tetrahedral meshes, and also shows their effective use in the CAE.
  • Parametric deformation of mesh models for efficient CAE
    Gaku Mizuno, Hiroaki Date, Satoshi Kanai, Takeshi Kishinami, Masahiko Onosato
    2006 SICE-ICASE INTERNATIONAL JOINT CONFERENCE, VOLS 1-13, 3697, +, IEEE, 2006年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), Free-Form Deformation (FFD) is a popular method for deforming 3D geometric models. FFD first embeds the model in the parametric space defined by regular lattice (handle). Then by deforming the handle, the embedded model is deformed. However the FFD has following problems for engineering applications such as deformation of mesh models for Computer Aided Engineering (CAE): 1) It is difficult to make handle suitable for intended deformation type such as bend and twist, 2) it requires complicated manipulation to deform and 3) it can not explicitly specify the degree of deformations such as angle of bend. Therefore, in order to solve these problems, we present a parametric deformation method for mesh models. First, we propose an FFD based on barycentric coordinates (BCFFD). Then, we propose an automatic handle construction method for the BCFFD based on definition and classification of deformation types such as bend, twist and so on. Finally, we propose a parametric deformation method. Using our methods, the user can deform the mesh model by selecting deformation type and portions to be deformed, and by manipulating one or two deformation parameters.
  • Segmentation of scanned mesh into analytic surfaces based on robust curvature estimation and region growing
    Tomohiro Mizoguchi, Hiroaki Date, Satoshi Kanai, Takeshi Kishinami
    GEOMETRIC MODELING AND PROCESSING - GMP 2006, PROCEEDINGS, 4077, 644, 654, SPRINGER-VERLAG BERLIN, 2006年, [査読有り]
    英語, 研究論文(学術雑誌), For effective application of laser or X-ray CT scanned mesh models in design, analysis, and inspection etc, it is preferable that they are segmented into desirable regions as a pre-processing. Engineering parts are commonly covered with analytic surfaces, such as planes, cylinders, spheres, cones, and tori. Therefore, the portions of the part's boundary where each can be represented by a type of analytic surface have to be extracted as regions from the mesh model. In this paper, we propose a new mesh segmentation method for this purpose. We use the mesh curvature estimation with sharp edge recognition, and the non-iterative region growing to extract the regions. The proposed mesh curvature estimation is robust for measurement noise. Moreover, our proposed region growing enables to find more accurate boundaries of underlying surfaces, and to classify extracted analytic surfaces into higher-level classes of surfaces: fillet surface, linear extrusion surface and surface of revolution than those in the existing methods.
  • High-quality and property controlled finite element mesh generation from triangular meshes using the multiresolution technique
    H Date, S Kanai, T Kishinami, Nishigaki, I, T Dohi
    JOURNAL OF COMPUTING AND INFORMATION SCIENCE IN ENGINEERING, 5, 4, 266, 276, ASME, 2005年12月
    英語, 研究論文(学術雑誌), In this paper, we propose a new triangular finite element mesh generation scheme from various kinds of triangular meshes using the multiresolution technique. The proposed scheme consists of two methods: a mesh quality improvement method and a mesh property control method. The basic strategy of these methods is a combination of the mesh subdivision and simplification. Given mesh is first subdivided to obtain enough degree of freedom for a property change, then by simplification using edge collapse for the resulting mesh to change the mesh properties, we can easily improve and control the mesh properties required for finite element analysis.
  • 広域的法線評価と改良Watershed法に基づくメッシュモデルの特徴稜線抽出手法(メディアと表現)
    溝口 知広, 伊達 宏昭, 金井 理, 岸浪 建史
    情報処理学会論文誌, 46, 12, 3175, 3187, 一般社団法人情報処理学会, 2005年12月, [査読有り]
    日本語, 研究論文(学術雑誌), 近年, リバースエンジニアリングや3Dデータベースの検索など, 様々なリソースからのメッシュモデルの入手が可能となり, 工業製品開発における意匠設計段階でこのようなメッシュモデルを用いる機会が多くなった.しかし, 工業製品開発の詳細設計のためには, 最終的に設計対象のソリッドモデルを生成することが必要であり, 製品開発期間短縮のため, メッシュモデルからソリッドモデルを自動で生成する技術が望まれている.そこで本研究では, メッシュモデルからのソリッドモデルの自動生成を支援するための, 広域的法線評価と改良Watershed法に基づくメッシュモデルの特徴稜線抽出手法を提案する.ここで述べる特徴稜線とは, 機能的に1つの面分として認識することが望ましい三角形集合からなる領域の境界線を意味する.本手法では, メッシュに含まれる測定ノイズやメッシュ分割方法の影響を受けにくい特徴稜線抽出が可能である.また, 特徴稜線で囲まれた領域を1つの面分として認識でき, 従来の特徴稜線抽出手法では抽出しにくかったフィレット面の境界線を特徴稜線として抽出することもできる.さらに, 異なる抽出パラメータ設定より得られる特徴稜線群のうちのユーザが要求する稜線のみを選択的に合成し, これらを3次元CADシステムで読み込む機能も実現した.
  • 特徴稜線部への高精度フィッティングが可能な細分割曲面リバースエンジニアリング
    遠藤 維, 伊達 宏昭, 金井 理, 岸浪 建史
    精密工学会誌論文集, 71, 9, 1168, 1172, 公益社団法人精密工学会, 2005年09月, [査読有り]
    日本語, 研究論文(学術雑誌), This paper proposes a new algorithm for fitting a Loop subdivision surface to dense sample points. Our fitting algorithm uses marching cubes and shrink-wrapping to fit the initial control mesh to the points measured from objects. It uses quasi-interpolation to quickly calculate the positions of initial control points from subdivision limit points and uses QEM- and curvature-based mesh simplification to preserve feature boundaries of the minute fillet regions so as to accurately fit to the feature edges. The effectiveness of our fitting algorithm was verified in reverse engineering of broad range of engineering mock-ups such as housings of a handheld wireless communicator, a cellphone, and a turbine blade. The resulting initial control mesh of the subdivision surface that was fit to over 10^6-point cloud had about several thousand of vertices with approximately 10^<-3> mean normalized fitting error.
  • メッシュモデルによる表面テクスチャ付き形状設計支援システム(ビジュアルシミュレーション(2))
    伊達 宏昭, 金井 理, 岸浪 建史, 岩越 睦郎, 小林 政義
    情報処理学会研究報告. グラフィクスとCAD研究会報告, 2005, 44, 55, 60, 一般社団法人情報処理学会, 2005年05月, [査読有り]
    日本語, 研究論文(研究会,シンポジウム資料等), 本論文では, 質感や機能面から重要となるしぼやロゴ等の微小な凹凸からなるテクスチャが貼り付けられた形状の効率的な設計・試作を支援するための, 三角形メッシュモデルを用いたテクスチャ付き形状設計支援システムについて述べる.本システムは, 3Dスキャンやテクスチャ抽出によるテクスチャメッシュデータの取得, 取得したテクスチャのデジタルデータ処理, ならびに, 領域や場所指定に基づくテクスチャメッシュ合成によるテクスチャ付き形状モデリング機能からなり, 効率的で柔軟なテクスチャ付き形状設計を実現している.
  • 特徴稜線認識型メッシュスムージング手法の研究(メッシュ処理)
    清水 貴文, 伊達 宏昭, 金井 理, 岸浪 建史
    情報処理学会研究報告. グラフィクスとCAD研究会報告, 2005, 44, 7, 12, 一般社団法人情報処理学会, 2005年05月, [査読有り]
    日本語, 研究論文(研究会,シンポジウム資料等), 本研究では, 3次元スキャナから得られる測定ノイズを含むメッシュモデルのノイズ除去を目的とした, 特徴稜線認識型メッシュスムージング手法を提案する.はじめに法線投票テンソルの固有値解析により特徴稜線を構成するメッシュエッジ群を抽出する.次に抽出したメッシュエッジ群をbilateral filteringにより特徴稜線方向にスムージングし, 最後にメッシュ全体をbilateral filteringによりスムージングすることで, 特徴稜線が稜線方向に滑らかで, かつ特徴稜線を境界として持つフェイスの測定ノイズが除去されたメッシュが得られる.
  • 分散制御システムの動的挙動モデリングのためのオブジェクト指向デザインパターンに関する研究
    戸村 豊明, 金井 理, 岸浪 建史, 上広 清, 山元 進
    精密工学会誌論文集, 71, 3, 379, 383, 公益社団法人精密工学会, 2005年03月, [査読有り]
    日本語, 研究論文(学術雑誌), 近年, 集中管理方式の制御システムに代わり, 分散制御システム (DCS) がFAやBA等の分野へ急速に普及している. 本研究では, DCSモデルにおける制御ノード・センサ・アクチュエータモデルの動的挙動をStatechartとして記述し, また, これらの間のイベント通信経路を記述するための2つのオブジェクト指向デザインパターンを新たに提案する. これらのパターンをDCSシミュレータへ組み込み, BA分野のDCS開発事例へ適用する事により, その有効性を確認できた.
  • 細分化と簡略化に基づく三角形メッシュの品質改善
    伊達 宏昭, 金井 理, 岸浪 建史, 西垣 一朗, 土肥 高幸
    精密工学会誌論文集, 71, 2, 223, 227, 公益社団法人精密工学会, 2005年02月, [査読有り]
    日本語, 研究論文(学術雑誌), 本論文では, 三角形メッシュの品質に依存する幾何・数値演算処理の安定性や精度の向上を目的とした, 頑強なメッシュ品質改善手法を提案する. 提案法は, メッシュ接続性操作自由度向上のための細分化と, 品質改善度評価に基づくメッシュ簡略化により, 入力の低品質メッシュの面分形状歪を減少し, 面分粗密を一様化するものであり, 数値的評価とFEMへ応用によりその有効性を示す.
  • Satoshi Kanai, Toyoaki Tomura, Kiyoshi Uehiro and Susumu Yamamoto: "Chapter 8, Object-oriented Design Pattern Approach to Seamless Modeling, Simulation and Implementation of Distributed Control systems", 67-76 (Eiji Arai, Jan Goosenaerts, Fumihiko Kim・・・               
    2005年
    Satoshi Kanai, Toyoaki Tomura, Kiyoshi Uehiro and Susumu Yamamoto: "Chapter 8, Object-oriented Design Pattern Approach to Seamless Modeling, Simulation and Implementation of Distributed Control systems", 67-76 (Eiji Arai, Jan Goosenaerts, Fumihiko Kimura and Keiichi Shirase編: "Knowledge and Skill Chains in Engineering and Manufacturing", Springer, New York) (2005).
  • A new bilateral mesh smoothing method by recognizing features
    T Shimizu, H Date, S Kanai, T Kishinami
    NINTH INTERNATIONAL CONFERENCE ON COMPUTER AIDED DESIGN AND COMPUTER GRAPHICS, PROCEEDINGS, 1, 1, 281, 286, IEEE COMPUTER SOC, 2005年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), In this paper, we propose a new mesh smoothing method for mesh models with measurement noise obtained from a 3D scanner. Our proposed method enables not only the removal of noise from the faces but the preservation and smoothing of features recognized as sharp edges and corners. First, by using the eigen analysis of normal voting tensor, mesh edges composed of sharp edges can be extracted. Second, bilateral filtering is applied to extracted mesh edges to smooth the mesh edges along the direction of the sharp edge. Finally, by applying modified bilateral filtering to the overall mesh, a mesh model with sharp edges smoothed along their directions and measurement noise removed from faces was obtained.
  • Mesh simplification and adaptive LOD for finite element mesh generation
    H Date, S Kanai, T Kishinami, Nishigaki, I
    NINTH INTERNATIONAL CONFERENCE ON COMPUTER AIDED DESIGN AND COMPUTER GRAPHICS, PROCEEDINGS, 1, 1, 339, 344, IEEE COMPUTER SOC, 2005年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), In this paper, we propose a new triangular finite element mesh generation method based on simplification of high-density mesh and adaptive Level-of-Detail (LOD) methods for efficient CAE. Mesh simplification evaluating mesh properties is applied to control the mesh properties required for FE mesh, such as the number of triangular elements, element shape quality and size while keeping the specified approximation tolerance. Adaptive LOD methods based on vertex hierarchy according to curvature and region of interest, and global LOD method preserving density distributions are also proposed in order to construct a more appropriate FE mesh. These methods enable efficient generation of FE meshes with appropriate properties for analysis from a high-density mesh. Finally, the effectiveness of our approach is shown through evaluations of the FE meshes for practical use.
  • Human-Computer Interactions for Digital Styling Design – A difficult road toward bridging the gap between concepts and 3D models               
    Research in Interactive Design, 1, VC20050024, 2005年
  • Feature edge extraction from mesh model based on wide range normal evaluation and modified watershed method
    T Mizoguchi, H Date, S Kanai, T Kishinami
    PROCEEDINGS OF THE 8TH JOINT CONFERENCE ON INFORMATION SCIENCES, VOLS 1-3, 1610, 1613, JOINT CONFERENCE INFORMATION SCIENCES, 2005年
    英語, 研究論文(国際会議プロシーディングス), Recently, a technique which automatically generates solid models from mesh models is required in the field of reverse engineering for more efficient product development. In this paper, we propose a new feature edge extraction method from triangular mesh models based on wide range normal evaluation and segmentation using the modified Watershed method. Our feature edge extraction method is robust for mesh models with scanning noise and different mesh connectivity, and it enables recognition of the region bounded by extracted feature edges as a face. It also enables extraction of boundary edges of the fillet surface as feature edges, which was difficult using previous methods. These characteristics are effective for automatic solid model generation. Moreover we implemented functions for selecting and collecting the required feature edges extracted at different parameter settings, and transferring the resulting feature edges into a 3D CAD system.
  • Textured shape design using detail extraction based on mesh smoothing and flattening
    H Date, S Kanai, T Kisinami
    APPLICATIONS OF DIGITAL TECHNIQUES IN INDUSTRIAL DESIGN ENGINEERING-CAID&CD' 2005, 146, 151, INTERNATIONAL ACADEMIC PUBLISHERS LTD, 2005年
    英語, 研究論文(国際会議プロシーディングス), In this paper, we propose a new texture extraction method from an existing mesh surface with texture consisting of small bumps for efficient textured shape design. Our texture extraction approach consists of two stages: In the first stage, the geometries of base surface and texture (displacements) are separated from the textured surface using a combination of smoothing operations: the normal smoothing for estimating base surface normals, and the smoothing of vertex positions for separating geometries. The latter one is realized by moving vertices along the estimated normal direction, and it enables extraction of displacements from meshes with different proper-ties. In the second stage, by applying mesh flattening using a parameterization technique to the estimated base surface, the initial flat mesh is generated. The final texture is then obtained by offsetting the vertices of the resulting flat mesh according to the extracted displacements. As a result, texture mesh, which represents bumpiness of the texture from base surface by the height values of the vertices, can be obtained.
  • "Low-cost and rapid prototyping of UI-embedded mock-ups using RFID and its application to usability testing",
    HORIUCHI S.
    Proceedings of HII International 2005 (CD-ROM), 4, 2504, 2005年
  • 「細分化と簡略化に基づく三角形メッシュの品質改善」
    伊達 宏昭, 金井 理, 岸浪 建史, 西垣 一朗, 土肥 高幸
    精密工学会誌, 71, 2, 223, 227, 公益社団法人精密工学会, 2005年
    日本語, 本論文では, 三角形メッシュの品質に依存する幾何・数値演算処理の安定性や精度の向上を目的とした, 頑強なメッシュ品質改善手法を提案する. 提案法は, メッシュ接続性操作自由度向上のための細分化と, 品質改善度評価に基づくメッシュ簡略化により, 入力の低品質メッシュの面分形状歪を減少し, 面分粗密を一様化するものであり, 数値的評価とFEMへ応用によりその有効性を示す.
  • 「分散制御システムの動的挙動モデリングのためのオブジェクト指向デザインパターンに関する研究」
    戸村 豊明, 金井 理, 岸浪 建史, 上広 清, 山元 進
    精密工学会誌, 71, 3, 379, 383, 公益社団法人精密工学会, 2005年
    日本語, 近年, 集中管理方式の制御システムに代わり, 分散制御システム (DCS) がFAやBA等の分野へ急速に普及している. 本研究では, DCSモデルにおける制御ノード・センサ・アクチュエータモデルの動的挙動をStatechartとして記述し, また, これらの間のイベント通信経路を記述するための2つのオブジェクト指向デザインパターンを新たに提案する. これらのパターンをDCSシミュレータへ組み込み, BA分野のDCS開発事例へ適用する事により, その有効性を確認できた.
  • Yui Endo, Hiroaki Date, Satoshi Kanai and Takeshi Kishinami: "A robust and accurate fitting algorithm of a Loop Subdivision Surface for a Complex and High Density Point Cloud", Proceedings of Digital Engineering Workshop, 156-163, (2005)*.*               
    2005年
  • Soh Horiuchi, Satoshi Kanai, Takeshi Kishinami, Shoichi Hosoda, Yasuaki Ohshima and Yoshiyuki Shiroma: "A New Virtual Design Mockup for Digital Devices with Operable GUI using an RFID chip and Mixed Reality", Proceedings of Virtual Concept 2005, [1/1(C・・・               
    2005年
    Soh Horiuchi, Satoshi Kanai, Takeshi Kishinami, Shoichi Hosoda, Yasuaki Ohshima and Yoshiyuki Shiroma: "A New Virtual Design Mockup for Digital Devices with Operable GUI using an RFID chip and Mixed Reality", Proceedings of Virtual Concept 2005, [1/1(CD-ROM) VC2005154] (2005)*. *
  • Muturo Iwakoshi, Seiki Yasuda, Masayoshi Kobayashi, Masamichi Mito, Satoshi KANAI and Takeshi Kishinami: “A Development of a Stereolithography Machine enabling Direct Fabrication of Colored Prototype”, Proceedings of SME Rapid Prototyping & Manufacturi・・・               
    2005年
    Muturo Iwakoshi, Seiki Yasuda, Masayoshi Kobayashi, Masamichi Mito, Satoshi KANAI and Takeshi Kishinami: “A Development of a Stereolithography Machine enabling Direct Fabrication of Colored Prototype”, Proceedings of SME Rapid Prototyping & Manufacturing 2005, [1/1(CD-ROM) ] (2005).
  • Satoshi Kanai, Toyoaki Tomura, Kiyoshi Uehiro and Susumu Yamamoto: "Chapter 8, Object-oriented Design Pattern Approach to Seamless Modeling, Simulation and Implementation of Distributed Control systems", 67-76 (Eiji Arai, Jan Goosenaerts, Fumihiko Kim・・・               
    2005年
    Satoshi Kanai, Toyoaki Tomura, Kiyoshi Uehiro and Susumu Yamamoto: "Chapter 8, Object-oriented Design Pattern Approach to Seamless Modeling, Simulation and Implementation of Distributed Control systems", 67-76

    (Eiji Arai, Jan Goosenaerts, Fumihiko Kimura and Keiichi Shirase編: "Knowledge and Skill Chains in Engineering and Manufacturing", Springer, New York) (2005).
  • 「広域的法線評価と改良Watershed法に基づくメッシュモデルの特徴稜線抽出手法」               
    情報処理学会論文誌, 46, 12, 3175, 3187, 2005年
  • Feature edges extraction on mesh models based on wide range normal evaluation and modified watershed method               
    Information Processing Society Japan Journal, 46, 12, 3175, 3187, 2005年
  • Endo,Y., KANAI,S. and Kishinami,T. : " A robust, accurate and flexible fitting algorithms of subdivision surface for point cloud in industrial design use", Proceedings of 3D Modelling 2004, [1/1(CD-ROM) 1] (2004)               
    2004年
  • Date, H., KANAI,S. and Kishinami, T. : " Mesh quality improvement based on mesh subdivision and simplification", Proceedings of 3D Modelling 2004, [1/1(CD-ROM) 2] (2004)               
    2004年
  • Urushihara, A., Kanai,S., Kishinami,T. and Tomura, T.: "BEHAVIOR MODELER: Systematically generating Statechart from Functional Relations and Scenarios for prototyping User Interface", Proceedings of 5th International Conference on Computer-aided Design・・・               
    2004年
    Urushihara, A., Kanai,S., Kishinami,T. and Tomura, T.: "BEHAVIOR MODELER: Systematically generating Statechart from Functional Relations and Scenarios for prototyping User Interface", Proceedings of 5th International Conference on Computer-aided Design of User Interfaces CADUI'2004, 67-80 (2004).*
  • Real -time tracking of head rotation for human-computer-interaction based on image projection curves               
    Takanori Yamada, Katsuhisa Shibukawa, Hiroaki Date, Satoshi Kanai, Takeshi Kishinami
    Proceedings of the Fourth IASTED International Conference on Visualization, Imaging, and Image Processing, 129, 134, 2004年
    英語, 研究論文(国際会議プロシーディングス), This paper addresses our proposed method to automatically detect the direction of the rotational motion of the human head The method introduced in this paper develops a human interface, especially in regards to the mouse cursor which can be controlled by the motion of the head motion. Conventionally, template matching is mainly used to make a computer recognize the motion and position of the human face, but there are several problems with terms of versatility and time involved with calculation. We propose a new algorithm to detect the head rotational motion by calculating the shift length of projection curves which are derived from the Hue information of each image.
  • Algebraic declaration and axiom based validation for user interface design of IT instrument
    Y Kikuchi, S Kanai, T Kishinami
    IEEE INTERNATIONAL SYMPOSIUM ON COMMUNICATIONS AND INFORMATION TECHNOLOGIES 2004 (ISCIT 2004), PROCEEDINGS, VOLS 1 AND 2, 232, 237, IEEE, 2004年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), We propose a declaration and validation method for finite state machine specification in an initial design phase of user interface. The declaration is based on the mathematical algebra. The validation has an input of the algebra and done based on C. A. R. Hoare's effort using prepared axiom set, The algebraic declaration is transferred to assertion and validated for specific subject. This methodology has an advantage of mathematical robustness and a flexibility to cover a lot of dynamic model. We developed a prototype system using Mathematica and used VWC (Visual Wireless Communicator) as a test case for declaration and validation. We are going to report background, subjects, the fundamental method, an implementation and a validation of declared VWC specification.
  • 分散制御システムの静的構造モデリングのためのオブジェクト指向デザインパターンに関する研究
    戸村 豊明, 金井 理, 岸浪 建史, 上広 清, 山元 進
    精密工学会誌, Vol.69, No.6, 815, 819, 公益社団法人精密工学会, 2003年
    日本語, Recently distributed control systems (DCS), which consist of many devices and a network interconnecting them, are introduced in various automation systems. For assuring the control performance under the heavy communication traffic, the simulation of DCS is strongly needed. For this purpose, we propose a uniform, efficient and systematic method based on object-oriented design patterns for modeling and simulating DCS. Two design patterns are newly proposed. Device-Constructor and Composite-Device-Constructor patterns describe classes and mechanisms for uniformly structuring device models composed of sensor and actuator models, and for uniformly structuring composite device models composed of device models. The systematic procedures of implementation from the patterns to Java code of the DCS model are also discussed. Finally, effectiveness of proposed method was proved in developing a Java-based DCS modeler and simulator for building automation area.
  • A cooperative simulation mechanism of distributed control systems based on object-oriented design patterns
    T Tomura, S Kanai, T Kishinami
    ISORC 2003: SIXTH IEEE INTERNATIONAL SYMPOSIUM ON OBJECT-ORIENTED REAL-TIME DISTRIBUTED COMPUTING, PROCEEDINGS, 83, 90, IEEE COMPUTER SOC, 2003年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), Distributed control systems (DCSs) consisting of a plant, a controller composed of many devices, and an open network interconnecting devices, are now used in many automation areas. For assuring the control performance under the heavy traffic on the network, the simulation of DCS is strongly needed. In the case of DCSs for controlling a mechanical plant, the graphical and cooperative simulation between the controller model and the plant model becomes important to verify the sequence of motions of the plant. For this purpose, we propose a systematic object-oriented-based DCS modeling procedure to efficiently and uniformly develop the DCS simulation model. From this procedure, we can describe the formal description of DCS simulation model based on five object-oriented design patterns which describe the structure and behavior of the DCS. We also propose an event chain mechanism between the statechart-based controller model and the graphical plant model. Finally, the cooperative DCS simulation software is developed by! using the Java 3D API.
  • XML/Web based infrastructure to support sharing geospatial data and ecological model for simulation of eco-resource
    F Tanaka, D Sakaguchi, S Kanai, T Kishinami, S Saitoh
    IGARSS 2001: SCANNING THE PRESENT AND RESOLVING THE FUTURE, VOLS 1-7, PROCEEDINGS, 213, 215, IEEE, 2001年
    英語, 研究論文(国際会議プロシーディングス), This paper describes the XML/Web based infrastructure to support sharing geospatial data and an ecological model for simulation of eco-resource.
  • An adaptive LOD control method for textured digital terrain model using wavelet-based multiresolution representation
    H Date, S Kanai, T Kishinami
    IGARSS 2001: SCANNING THE PRESENT AND RESOLVING THE FUTURE, VOLS 1-7, PROCEEDINGS, 1847, 1849, IEEE, 2001年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), In this paper, we propose an adaptive level-of-detail control method using wavelet-based multiresolution representation for triangulated mesh and digital image for the purpose of efficient data processing for transmitting and displaying a textured digital terrain model in a network-based server-client system.
  • Copyright protection of vector map using digital watermarking method based on discrete Fourier transform
    Kitamura, I, S Kanai, T Kishinami
    IGARSS 2001: SCANNING THE PRESENT AND RESOLVING THE FUTURE, VOLS 1-7, PROCEEDINGS, 1191, 1193, IEEE, 2001年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), In this paper, a new digital watermarking method for the vector map was proposed, where the watermark could be embedded in a set of polylines by using discrete Fourier transform (DFT). The robustness for the external attacks and visual degradation caused by embedding were evaluated and effectiveness of the watermarking was confirmed. Our watermarking method is especially robust for the attacks of the vertex reorder, and noise imposition on vertex coordinates.
  • Seamless design methodology of manufacturing cell-control software based on activity-control-condition and object diagram
    T Tomura, S Kanai, T Kishinami
    INTERNATIONAL JOURNAL OF COMPUTER INTEGRATED MANUFACTURING, 13, 3, 263, 272, TAYLOR & FRANCIS LTD, 2000年05月, [査読有り]
    英語, 研究論文(学術雑誌), A manufacturing cell. must be changed according to the type, variations and intended rate of production for the product. In order to shorten the period of time required for the cell-control software development, the system designer must have the descriptions of the configuration of the cell and the sequence of activities required in the cell, and a comprehensive design methodology based on these descriptions. First, we propose a seamless design methodology that is comprehensive and has a clear design concept. The methodology is based on the diagrammatic specification and the conversion processes of it, The diagrammatic specification represents both the configuration of die cell and the sequence of activities required in the cell; what kind of devices exist in the cell and how they are connected with each other, and how they should work in order to complete the task. The methodology specifies the step-by-step conversion processes from the initial diagrammatic specification to the cell-control software code, The conversion is divided into three processes: refinement of the device activities, translation of the device activities into the cell-controller activities, and transformation from the cell-controller activities to the cell-control software code. Secondly, as the diagrammatic specification, we propose an object diagram and an Activity-Control-Condition (ACC) diagram. The object diagram represents a set of objects and the links among them. The ACC diagram represents the sequence of activities required in the cell as three constructs: the state transitions of objects involved in each activity, the control logic among activities and the conditions for the control. Thirdly, we show the diagram editor how to help the system designer carry out the processes in the design methodology. The system designer can use the following functions of the diagram editor: modifying, sating and loading the object diagram and ACC diagram, and generating the cell-control software code from the translated ACC diagram. Finally, we show the implementation method of the cell-control software, and we verify the functionality of the software by comparing it with the sequence of activities in the ACC diagram.
  • Object-oriented graphical specification and seamless design procedure for manufacturing cell control software development
    Satoshi Kanai, Takeshi Kishinami, Toyoaki Tomura
    Proceedings-IEEE International Conference on Robotics and Automation, 1, 401, 407, 2000年, [査読有り]
    英語, 研究論文(学術雑誌), In this paper, a seamless design methodology for developing manufacturing cell control software is proposed. The methodology is based both on the graphical specification and on the systematic design procedure of its conversion to the control code. The graphical specification describes the component configuration of the cell and the activity sequence on which the devices should act. An object diagram and an Activity-Control-Condition (ACC) diagram are introduced for this purpose. The systematic design procedure specifies a clearly-defined conversion from the initial graphical specification to the cell control software code. The conversion consists of three processes: refinement, translation and transformation. A diagram editor has also been developed to help the programmer carry out this design procedure. Finally, the functionality of the control software generated by using the proposed methodology is validated through co-simulation with a Petri net simulator.
  • Digital watermarking for 3d polygonal model based on wavelet transform
    Hiroaki Date, Satoshi Kanai, Takeshi Kishinami
    Proceedings of the ASME Design Engineering Technical Conference, 2, 1063, 1072, American Society of Mechanical Engineers (ASME), 1999年
    英語, 研究論文(国際会議プロシーディングス), Recently, much interest is being taken in a method to protect the copyright of digital data and prevent illegal duplication of it. However, in the area of CAD/CAM and CG, there are no effective ways to protect the copyright of the 3D geometric models. As a first step to solve this problem, a new digital watermarking method for 3D polygonal'models is introduced in this paper. Watermarking is one of the copyright protection methods where an invisible watermark is secretly embedded into the original data. The proposed wateimarking method is based on the wavelet transform (WT) and multi-resolution representation(MRR) of the polygonal model. The watermark can be embedded in the large wavelet coefficient vectors at various resolution levels of the MRR. This makes the embedded watermark imperceptible and invariant to the affine transformation,- and also makes the control of the geometric error caused by the watermarking reliable.

その他活動・業績

書籍等出版物

  • 地理空間情報の基本と活用               
    古今書院, 2009年
  • Basic Theory and Application of Geo-spatial Information               
    KOKON SYOIN, 2009年
  • デジタルスタイルデザイン               
    海文堂出版株式会社, 2008年
  • Computer-Aided Design of User Interfaces IV               
    Kluwer Academic Publishers, 2005年

講演・口頭発表等

担当経験のある科目_授業

  • 信号処理               
    北海道大学 工学部
  • 科学技術英語演習               
    北海道大学 工学部
  • デジタル形状設計               
    北海道大学 工学部
  • システム情報演習Ⅰ               
    北海道大学 工学部
  • メカトロニクス基礎               
    北海道大学 工学部
  • システム情報設計学特論               
    北海道大学 大学院情報科学研究科
  • システムデザイン               
    北海道大学 工学部

所属学協会

  • 日本写真測量学会               
  • IEEE               
  • 日本設計工学会               
  • 精密工学会               

Works(作品等)

  • 韓国海洋大学校工科大学での学部学生向け特別講演の実施               
    2011年
  • Delft工科大学での教員向け特別講演の実施               
    2011年

共同研究・競争的資金等の研究課題

  • 「教育と臨床の乖離」に架橋する在宅人工呼吸器複合現実シミュレータの開発
    科学研究費助成事業
    2022年04月01日 - 2025年03月31日
    コリー 紀代, 二宮 伸治, 金井 理, 近野 敦, 井上 創造, 中村 美鈴, 小水内 俊介
    本研究では、①医療事故の体験も可能な人工呼吸器複合現実シミュレータの開発と、②機械学習を用いた特徴量抽出による学習評価アルゴリズムの構築を目的としている。


    ①に関しては、広島国際大学の二宮教授ラボにおいて人工呼吸器の操作パネルと測定値グラフの表示が可能な人工呼吸器トレーニングアプリSimmarを開発いただき、関東圏の2大学において大学院生約40名を対象としたユーザテストとアンケート調査を実施した。その結果、卒後1年目から人工呼吸器に携わったと回答した者が30名(71.4%)、学部レベルでSIMMAN-ALS5000を使用した経験のある12名のうち、8名が満足したと回答し、4名が不満と回答した。大学院レベルでSIMMAN-ALS5000を使用した17名のうち、12名が満足したと回答した。まともに習ったことがないという自由記載も認められた。同時に、特別支援学校における人工呼吸器装着児への看護師のかかわりについて360度動画教材を開発し、アンケートを実施したところ、教材の難易度について、学部3年次の学習内容として適切と回答した者が約8割、学部4年次として適切と回答した者が同じく約8割であった。2023年度はこれらの結果と学会発表後のディスカッションを踏まえ、教材の難易度を設定する。


    ②に関しては、九州工業大学の井上教授と共に機械学習において抽出すべきタスクについて検討し、先行研究に基づき、手袋着用から手袋廃棄までの気管内吸引の一連の流れを1回の気管内吸引とし、吸引前の判断指標となる「肺音聴診」、吸引後の看護介入である「体位ドレナージ」を含めた行動認識のためのアノテーションを進めている。翌年度は、習熟度を判定する分類器の開発を進める。
    日本学術振興会, 基盤研究(B), 北海道大学, 22H03701
  • 「教育と臨床の乖離」に架橋する在宅人工呼吸器複合現実シミュレータの開発               
    科学研究費補助金
    2022年04月 - 2024年03月
    コリー紀代, 金井理, 近野敦, 小水内俊介, 二宮信治
    日本学術振興会, 基盤研究(B), 北海道大学大学院医学系研究院,北海道大学大学院情報科学研究院 他, 研究分担者, 22H0370102
  • 三次元画像解析に基づく新規骨性パラメーターによる股関節疾患の遠隔画像診断法の確立               
    科学研究費補助金
    2021年04月 - 2024年03月
    入江 徹, 金井 理
    基盤研究(C), 研究分担者
  • 3次元画像計測を用いた 堆雪体積測定技術の開発               
    令和4年度:建設現場の生産性を飛躍的に向上するための革新的技術の導入・活用に関するプロジェクト
    2022年08月 - 2023年03月
    金井理, 須田清隆, abdulrahman mohamed, 漆館直
    国土交通省, 共同研究, 環境風土テクノ,北海道大学情報科学研究院,建設IOT研究所,堀口組, 研究分担者
  • SfM-MVSのための最適撮影計画支援システムの実用化に向けた開発
    2021年08月 - 2023年03月
    金井理,伊達宏昭, 本間亮平, 新名恭仁
    ㈱アジア航測, 共同研究, 研究代表者
  • CAEモデル自動生成のためのデジタル幾何処理技術に関する開発               
    2021年06月 - 2023年03月
    伊達宏昭, 髙嶋英巌, 泰地哲史
    ㈱AIS北海道, 共同研究, 研究代表者
  • 写真計測による土木構造物の高能率・高品質3次元再構成技術の開発               
    2020年04月 - 2022年03月
    金井理, 須田清隆
    ㈱環境風土テクノ, 奨学寄附金, 研究代表者
  • レーザ計測に基づく屋内空間のAs-built CFD解析用メッシュ生成技術の開発               
    2020年11月 - 2021年10月
    金井理, 脇坂英佑
    ㈱新菱冷熱, 奨学寄附金, 研究代表者
  • 点品質最適化に基づく環境3次元計測点群データ処理手法の開発
    科学研究費助成事業
    2018年04月01日 - 2021年03月31日
    伊達 宏昭, 金井 理
    本研究では,大規模環境や大型構造物の3次元計測点群データを様々な応用において安定かつ高精度に利用するための,計測品質を考慮した3次元計測データ処理手法群の開発を行った.具体的には,計測点群の各点における計測精度や信頼性を推定可能な点品質推定法の開発,高品質点群取得のための3次元計測支援技術の開発,ならびに,点品質に基づく高精度な処理を可能とする基本計測点群データ処理手法の開発を行い,実計測点群データへの適用を通してその有用性を定量評価した.
    日本学術振興会, 基盤研究(C), 北海道大学, 18K03896
  • 3次元計測点群からの消波ブロックの3次元認識と補充ブロックの高精度見積               
    2020年04月 - 2021年03月
    金井理, 佐野朝昭
    ㈱アルファ水工, 奨学寄附金, 研究代表者
  • 中小建設業を対象にした映像を活用したIoT施工法(VisualConstruction)の開発               
    建設技術研究開発費補助金
    2019年10月 - 2021年03月
    金井 理
    国土交通省, 研究代表者, 競争的資金
  • 即時判断力と巧緻性を向上する3D映像投影シミュレーターの開発
    科学研究費助成事業
    2017年04月01日 - 2020年03月31日
    コリー 紀代, 金井 理, 近野 敦, 二宮 伸治, 中村 美鈴, 浅賀 忠義, 井上 創造, 小水内 俊介, 萬井 太規, 村田 恵理
    本研究では、気管内吸引を実施する過程で必要となる「瞬時の多角的判断」と「繊細なカテーテル操作」を訓練するため、患者の生体反応を3D映像投影で呈示するProjection Mappingシミュレータを開発し、気管内吸引の吸引時間延長による動脈血中酸素飽和度の低下、という臨床的に頻度の高いシナリオを用いた看護師の判断能力への効果を、視線計測とモーションキャプチャーという客観的指標を用いて検証した。
    その結果、看護学生と看護師の視線と動作の特徴について一定の見解が得られたため、論文化し、国際ジャーナルに投稿する予定である。また現在、所属機関の産学連携部を通じて特許出願中である。
    日本学術振興会, 基盤研究(B), 北海道大学, 17H04425
  • MMS計測点群を直接利用した超写実VR環境の生成と感性情報に基づく走行路面評価
    科学研究費助成事業
    2014年04月01日 - 2018年03月31日
    川村 彰, 亀田 貴雄, 鈴木 聡一郎, 亀山 修一, 萩原 亨, 山崎 元也, 富山 和也, 金井 理
    本研究は、道路利用者の視点による走行路面評価方法を提案するとともに、高水準の舗装マネジメントシステムの構築を目指している。
    最初に、実路のレーザー計測点群データ収集と気象データに基づく超写実的走行シナリオを作成し、ドライビングシミュレータ(DS)を利用した被験者試験により、感性に基づく路面の主観評価と生理的応答測定を実施した。その結果、生理的信号測定の被験者評価への有用性を確認した。続いて、様々な走行環境を考慮した生理応答解析をDS実験により実施した。その結果、路面特性に対応した感性表現の特定が可能となり、走行路面の維持管理や道路利用者へのサービス性能評価に対応した路面評価モデルを開発した。
    日本学術振興会, 基盤研究(B), 北見工業大学, 26289167
  • 複数種の3Dスキャナを用いた大規模環境の高品質点群生成
    科学研究費助成事業
    2014年04月01日 - 2017年03月31日
    伊達 宏昭, 金井 理
    本研究では,大規模環境や大型構造物の高品質な3次元計測データを取得するための,様々な計測システムで得られた計測データの合成技術ならびに計測最適化技術の開発を行った.計測データ合成技術として,固定式レーザスキャナ,車載型レーザスキャナ,ハンディスキャナや,Structure from Motionで得られた3次元計測データの,効率的な自動位置合せ(レジストレーション)手法を開発した.計測最適化技術として,計測対象の計測重要度と計測特性を配慮して,少ない回数で対象を高精度に計測するための固定式レーザスキャナの最適設置位置を自動推定する方法を開発した.
    日本学術振興会, 基盤研究(C), 北海道大学, 26420073
  • レーザスキャンとデジタルヒューマンを融合した大規模実環境のアクセシビリティ評価
    科学研究費助成事業
    2014年04月01日 - 2016年03月31日
    金井 理, 伊達 弘昭
    実際の大規模な屋内外環境の3次元レーザスキャンから,その環境に存在する物体の詳細形状や意味属性までをも高精度に再現した3次元実環境モデルを自動構築し,その環境モデル内で,視覚や自律歩行を模擬できる精緻な人間のモデルであるデジタルヒューマンモデル(DHM)を動作させ,行動時に人間にかかる身体的・認知的負荷を数値的に予測推定するシステムを開発した.これにより,屋内外の実環境に対する「アクセシビリティ」を,レーザスキャン計測データと計算機シミュレーションのみから効率的・合理的に評価できるソフトウエアを試作し,その有効性を検証した.
    日本学術振興会, 挑戦的萌芽研究, 北海道大学, 26560168
  • リバースエンジニアリングの迅速化を図る3次元CAD/CAMデータ作成支援システムの開発               
    受託研究
    2012年04月 - 2015年03月
    金井 理
    北海道立総合研究機構, 研究代表者, 競争的資金
  • モバイルマッピングによる計測データを用いた物体認識の研究               
    共同研究
    2014年01月 - 2014年06月
    金井 理
    国際航業株式会社, 研究代表者, 競争的資金
  • 高精度属性付MMS点群の高精度・高能率Registration手法の開発               
    共同研究
    2013年04月 - 2014年03月
    伊達 宏昭
    アジア航測株式会社, 競争的資金
  • レーザスキャンによる3次元as-built設備モデルの全自動構築・更新技術の開発
    科学研究費補助金(基盤研究(B), 基盤研究(B))
    2012年 - 2014年
    金井 理
    社会インフラに用いられる大型設備の現況を反映し,設備の意味情報が付加された3次元モデルである「as-built設備モデル」を,レーザスキャナによる現況設備の計測点群から全自動で構築でき,かつ長期に渡り,モデル情報を最小限の追加レーザスキャン作業で継続的に更新可能な,高い自動化レベルをもつ形状認識・モデリング処理のソフトウエアを開発する.また,化学プラント・大型ビル・発電施設などのように,モデル化すべき設備のクラスが変っても,認識やモデリングの基本処理が不変性・共通性をもつアルゴリズムを考案することが,本研究の目的である.
    文部科学省, 基盤研究(B), 基盤研究(B), 北海道大学, 研究代表者, 競争的資金, 24360057
  • モバイルマッピングによる計測データを用いた物体認識の研究               
    共同研究
    2012年11月 - 2013年06月
    金井 理
    国際航業株式会社, 研究代表者, 競争的資金
  • 高精度属性付MMS点群の高精度・高能率Registration手法の開発               
    共同研究
    2012年04月 - 2013年03月
    金井 理
    アジア航測株式会社, 研究代表者, 競争的資金
  • マイクロフォーカスX線CTシステムを用いた現物融合型CAD/CAE解析技術の開発               
    受託研究
    2010年07月 - 2012年03月
    金井 理
    北海道立総合研究機構, 研究代表者, 競争的資金
  • 多重解像度メッシュモデルを用いた高精度なMEMSデバイス工程設計支援の研究
    科学研究費補助金(挑戦的萌芽研究)
    2011年 - 2012年
    金井 理, 伊達 宏昭
    (1) 多重解像度メッシュモデルによるMEMSデバイスの理想形状と製造誤差形状の重畳表現の開発: MEMSデバイス理想形状を,アセンブリ型メッシュモデルとして表現する. さらに,エッチング時の壁面の湾曲や稜線部の丸まりなどの製造誤差を含んだデバイス形状を,局所的に微細な寸法をもつ3角形の集合体として表現し, これらを粗いスケールの3角形へ多対一対応させた「多重解像度表現」としてデータ管理する方法を開発した. (2) X線CTによるMEMSデバイスの実誤差形状計測とメッシュモデルによる表現: マイクロフォーカスX線CT装置により,加速度センサMEMSを3次元計測し,実際の製造誤差を含む形状のボリュームデータ,ならびに境界面計測メッシュモデルを生成した.またこの計測メッシュモデル上で,溝部壁面の真直度やエッチングアスペクト比を,市販ソフトウエアにより計測した.(3)Fabrication Featureの自動抽出と製造可能な工程順序の全探索機能の開発: デバイスの各堆積層の境界面分集合であるFabrication Featureをメッシュモデル内から自動認識し,Featureの幾何形状に基づいて3種類に分類した.さらに,Feature間の投影重複関係を計算し,この関係に合致するFeature群の堆積順序の組合せを再帰的に探索させ,デバイスを製造可能な全工程順序を探索する機能を開発した.また,製造不可能なデバイスを誤って設計しても,Fabrication Featureの形状さえ製造可能であれば,「製造不可」という判定ではなく,初期設計案に形状が類似し,製造可能なデバイス形状の工程順序を導出する機能を開発した.これらの機能を3次元ソリッドモデリングライブラリであるParasolid上に実装した.
    文部科学省, 挑戦的萌芽研究, 北海道大学, 研究代表者, 競争的資金, 23656112
  • デジタルハンドを用いた実的な仮想エルゴノミック評価システムの開発
    科学研究費補助金(基盤研究(B))
    2009年 - 2011年
    金井 理, 城間 祥之, 伊達 宏昭, 持丸 正明
    本研究は,ヒトの手指の形状と運動を精密に再現した「デジタルハンド」により,デジカメ等のハンドヘルド型製品の3次元CADモデルを仮想的に把持・操作させ,「持ちやすさ」や「操作のしやすさ」を迅速に評価できる「仮想エルゴノミック評価システム」の開発が目的である.このため,(1)MRI計測に基づく高精度なデジタルハンド構築,(2)最適化に基づく把持姿勢自動生成,(3)手指筋骨格モデルを用いた「持ちやすさ」の定量推定,(4)逆運動学に基づいた「操作のしやすさ」の定量推定,(5)手指・製品間の高速な接触変形シミュレーションといった機能を開発した.またこれらを,企業での製品形状評価に試用した.
    文部科学省, 基盤研究(B), 北海道大学, 研究代表者, 競争的資金, 21360067
  • 3次元デジタルプロトタイプを用いた情報機器の超短期間ユーザビリティ評価システムの開発               
    平成21年度シーズ発掘試験(発掘型)
    2009年08月 - 2010年03月
    金井 理
    科学技術振興機構, 研究代表者, 競争的資金
  • 機械装置のリアルタイム制御シミュレーション技術に関する研究               
    平成21年度 特別教育研究経費連携融合事業
    2009年04月 - 2010年03月
    金井 理
    北海道大学 連携融合事業「協働型開発研究事業-地域COEの形成-」, 研究代表者, 競争的資金
  • 航空レーザ点群データを用いた高精度モデリング技術の開発               
    共同研究
    2008年07月 - 2009年03月
    金井 理
    国際航業株式会社, 研究代表者, 競争的資金
  • プレス成型品スプリングバック見込み形状自動生成に関する研究               
    共同研究
    2008年06月 - 2009年03月
    金井 理
    トヨタケーラム, 研究代表者, 競争的資金
  • Recognition and Modeling from 3D Measured Data from Large-scale Environment               
    2009年
    競争的資金
  • CT計測データからの全自動・高品質3次元形状モデル構築技術の開発
    科学研究費補助金(基盤研究(B))
    2007年 - 2008年
    金井 理, 伊達 宏昭
    本研究は, 工業用X線CT計測データから全自動・高品質な3次元形状モデルを構築する技術を実現すべく, 実工業製品の大規模なX線CT計測メッシュから, エンジニアリングで要求される高品質な3次元形状モデルのフィーチャ認識を, 高精度に, 安定かつ自動で, しかも高速に行なえるアルゴリズムと, 認識の基本となる高精度なメッシュ曲率算出アルゴリズムを開発し, そのアルゴリズムが十分な実用性をもつことを検証した.
    文部科学省, 基盤研究(B), 北海道大学, 研究代表者, 競争的資金, 19360067
  • デジタルハンドを用いた情報機器の意匠・エルゴノミクス両立デザイン支援の研究
    科学研究費補助金(萌芽研究)
    2007年 - 2008年
    金井 理, 持丸 正明, 城間 祥之
    (1)製品のユーザインタフェース操作に適したデジタルハンド把持姿勢自動生成手法の開発デジタルハンドに対する把持姿勢の容易な把持姿勢例題のデータベースを用い, 対話入力なしに, 情報機器に適した把持姿勢を自動導出できる新たな把持姿勢生成法を提案した. まず把持させたい製品モデルに対し, データベースへ登録された既存の把持姿勢例題中から, 入力製品形状を幾何学的に把持可能な全ての姿勢候補を形状マッチングにより探索し, 次に上肢関節可動性と製品表示部可視性という2種類の幾何学的制約に基づき, 姿勢候補の効率的な絞り込みを行うことで, 入力された情報機器の把持と操作に適合したごく少数の姿勢候補のみを導出可能なことを, 2種類の情報機器製品モデル(デジタル1眼レフカメラ, 携帯電話)に対する把持姿勢生成の計算機実験から明らかにした.(2)製品再設計のためのフィット性を考慮したデジタルハンド把持姿勢自動生成手法の開発持ちやすさの第三の評価指標として, 筐体と手の問の「フィット性」の仮想評価手法を提案するとともに, フィット性に優れた把持姿勢を最適化に基づき生成する手法を提案した. すなわち, ハンド・筐体間の接触点数, 筐体凸稜線部への指腹部分の重複程度, 手指関節角の連動性の3者から構成されるフィット性を表した目的関数を設定し, その最適化に基づき把持姿勢を自動決定する手法を開発している. また市販一眼レフカメラのグリップ部を対象に, 推定された最適把持姿勢を実被験者に再現させ, その姿。勢が人間にとっても, よりフィット感の高い妥当な姿勢であることを実験的に検証した.
    文部科学省, 萌芽研究, 北海道大学, 研究代表者, 競争的資金, 19650043
  • 現物融合型デジタルエンジニアリング               
    科学研究費補助金
    2007年
    競争的資金
  • Convergent Type Digital Engineering               
    Grant-in-Aid for Scientific Research
    2007年
    競争的資金
  • 高度メッシュ操作技術に基づくソリッドレス意匠設計・解析融合プロセスの研究
    科学研究費補助金(基盤研究(B))
    2005年 - 2006年
    金井 理, 伊達 宏昭
    本研究は,意匠デザイン初期段階で容易に入手可能なスケッチ図や物理モデル測定点群などを入力とし,類似構造をもつ過去の解析用メッシュモデルを探し出し,これを入力にフィットするよう変形・整形させることで,新規デザイン形状に対する解析用メッシュモデルを容易かつ迅速に得ることが可能なソフトウエアの開発を目的とした.この実現のため,ソリッドモデリングと同等の形状操作能力を持ち,かつ解析用メッシュ生成に耐えうる高度なメッシュモデル操作技術を開発した.具体的な研究実績は下記の通りである.(1)スケッチに基づく類似構造メッシュ検索機能の開発問合せスケッチと類似ビューを持つ3次元メッシュモデルを,剛体変換に依存せず探索できるメッシュ検索機能を,Generic Fourier DescriptorとLocal Binary Patternを利用し開発した.(2)複数メッシュ合成機能の開発2つの複雑な4面体メッシュの重複部分を矛盾なく1つのメッシュにアセンブリする処理を,4面体メッシュに対する表面オフセットとEdge Collapse機能の組合せにより実現した.(3)メッシュ特徴領域消去機能の開発メッシュ上の微小な穴・溝・ボスなどの特徴領域を認識し,これをモデル上から消去・復元可能な特徴領域認識とLOD機能をEdge Collapseを応用し開発した.(4)大規模解析モデルの特徴認識・変形機能の開発工業用X線CTスキャン等から得られた大規模モデル上から,解析曲面で近似できる部分表面領域を自動認識するとともに,重心座標を利用した寸法駆動型メッシュモデルの変形・整形機能を開発し,その有効性を確認した.以上の成果を,研究論文11件,特許出願2件として公表した.
    文部科学省, 基盤研究(B), 北海道大学, 研究代表者, 競争的資金, 17360056
  • プロダクトライフサイクルのためのデジタルセマンテック製品モデルの研究開発
    科学研究費助成事業
    2002年 - 2006年
    岸浪 建史, 山田 誠, 田中 文基, 赤間 清, 三井 聡, 近藤 司, 金井 理
    製品設計から製造において,CAD,CAE,CAM,PDM,CNC工作機械などといったデジタルツールへの依存が増加している.コンカレントエンジニアリングにおいては,異なるデジタルツール間での製品データのデータ交換が頻繁に行われることが必要となっている.設計と製造の有機的な結合と,トレーサブルな製造システムを実現するためには,どのコンピュータ実装にも依存しない形での情報の意味を表現することによる相互運用可能なデジタルツールの実現が必要不可欠である.相互運用性は,製品モデルデータにおいて,対象をすべての協調製造環境において正確に表現することができるかどうかということである.今日では,幾何表現データ,公差データなどすべてのエンジニアリングデータがすべての製品開発段階を通して使用されているわけではない.相互運用におけるエラーは,デジタルツールにおいて製品モデルデータを使用不可能にするエラーである.協調製造環境において相互運用におけるエラーが発生した場合,エラーの原因を探すのは,コストと時間の観点から大変な作業となる.さらに,製品のライフサイクルの間中,情報を表現するデータの品質を保つ必要がある.本研究では,これらの要求を満たすモデルとして,デジタルセマンティック製品モデルを提案した.
    デジタルセマンティック製品モデルは,製品モデルの品質保証法,人間(設計者や作業者)が理解できコンピュータが処理可能なセマンティックモデル,製品のライフサイクルをサポートするための機能モデルから構成している.本研究では,ISO規格に準拠した製品モデルに対する,製品データ品質検査法の提案,すべてのライフサイクル作業をサポートするための機能モデルの開発,データの意味を表現するために,ISO規格でありオブジェクト指向言語であるEXPRESS言語を用いたデータモデル化と,XMLを用いたデータの表現を行った.
    日本学術振興会, 基盤研究(S), 北海道大学, 14102032
  • 多分野シミュレーションを融合可能な自動機の高度機能評価システムの研究
    科学研究費補助金(基盤研究(C))
    2003年 - 2004年
    金井 理, 中村 孝太郎, 戸村 豊明, 岸浪 建史
    自動パッケージング機の設計プロセスにおいて、ワーク変形挙動,機構シミュレーション,制御ソフトウエア等の個々のシミュレータを通信により連携させることで,機械内の運転状態をシミュレート可能な評価システムを実現することが、本研究の目的である.本研究の成果概要は,下記のとおりである.(1)分散協調シミュレーション標準であるHLAに準拠したミドルウエアRTIを用い、市販の機構シミュレータと制御ソフトウエアシミュレータを実時間で協調させる開発方法論と実効環境を開発し、CDドライブ装置の自動開閉機構の動作制御機能検証に応用し、隠された設計ミス発見に有効であることを確認した。(2)複数シミュレータを協調動作させる際の,効率的なシミュレーション時刻進行のため、時刻ステップを可変にできるTime Warpメカニズムを開発し,これを協調シミュレーションのFederate内に組み込み,FieldBusで制御される自動機械のシミュレーション効率が向上することを確認した.(3)包装自動機の機能検証において,ワーク変形をFEMにより予測するため,メッシュ要素数とメッシュ形状品質の柔軟に制御可能な多重解像度有限要素メッシュ自動生成技術を開発した。また、離散シェルモデルに基づく包装フィルムの変形シミュレーションアルゴリズムを実装し,フィルム上の微少な折れにより生ずる包装プロセス不良の予測が,ある程度予測可能であることを明らかにした.
    文部科学省, 基盤研究(C), 北海道大学, 研究代表者, 競争的資金, 15560089
  • デジタルヒューマンモデルを利用した製品の仮想エルゴノミック評価技術               
    科学研究費補助金
    2004年
    競争的資金
  • Virtual ergonomic assessment of products using Digital human model               
    Grant-in-Aid for Scientific Research
    2004年
    競争的資金
  • マルチレゾリューション・メッシュモデリングによる3次元設計環境の統合
    科学研究費補助金(基盤研究(C))
    2001年 - 2002年
    金井 理, 岸浪 建史
    3角形で構成されるマルチレゾリューション(多重解像度)・メッシュモデルを形状モデルの基準とする,統一性のある新たな3次元設計環境を構築しようというのが,本研究の目的である.本研究成果の概要は,下記のとおりである.(1)FEM解析用多重解像度メッシュモデル生成手法の開発意匠デザインで作成された高密度メッシュモデルから,メッシュ詳細度および形状詳細度の双方を独立に制御可能で,かつ解析に適する要素形状や節点次数が可能な限り一様化される,詳細形状除去型および詳細形状保存型の多重解像度メッシュモデル生成手法を夫々開発した.(2)干渉計算の効率化のための多重解像度メッシュモデル生成手法の開発ディジタルモックアップ等の基本機能として必要となるメッシュモデル間の効率的千渉チェック演算に適した,低解像度モデルが高解像度モデルを包含し,かつその形状膨張量が最小となる多重解像度メッシュモデルを,線形計画法を利用して高速に生成する手法を開発した.(3)Quasi-Interpolatlonを利用した点群からの細分割曲面メッシュ生成手法の開発Quasi-Interpolation(準補間)と適応的分割手法を利用し,高密度測定点群にフィットするLoop細分割曲面の初期制御メッシュを,適応的にかつ高速・安定に算出する手法を開発し,実際の測定点に対するフィッティング実験を行った結果,数万点の測定点群を数百点の初期制御メッシュで近似可能であることが確認された.
    文部科学省, 基盤研究(C), 北海道大学, 研究代表者, 競争的資金, 13650110
  • 情報機器設計とプロトタイピングのためのデジタルエンジニアリング               
    受託研究
    2002年
    競争的資金
  • Digital Engineering for design and prototyping of information appliances               
    Funded Research
    2002年
    競争的資金
  • 統合生産設計システムのための加工知識・生産資源のモデル化に関する研究
    科学研究費助成事業
    2000年 - 2001年
    岸浪 建史, 田中 文基, 金井 理
    生産技術・生産システムの進化とは、生産知識・技術・資源の再利用・再編・蓄積の中で、新たな生産知識・技術を生成する事であると考えると、生産知識・技術・資源の利用・蓄積を可能とする統合生産設計支援システムが必要とされる。しかし、生産設計を支援する体系的なモデル化技術と、それをベースとした統合生産設計支援システムは実現されていない。従って、この問題点を解決するために本研究では以下のことを行う事を目的とする。
    (1)生産技術および生産システムにおける、あらゆる加工知識・技術・資源を再利用・再編可能な形式で外在化し蓄積・交換することができる情報モデル化技術を確立する。
    (2)情報モデル化技術により、製品モデルの加工に必要な加工知識・技術・資源を俊敏にそして柔軟に利用・蓄積する統合生産設計支援システムを構築する。
    (3)統合生産設計支援システムを用い、生産設計に必要な知識・技術・資源の俊敏で柔軟な利用が可能なことを確認する。
    以上の目的を達成するため研究を遂行し、以下の研究成果を得た。
    (1)種々のフライス加工機械のEXPRESSモデルを構築し、具体的データを入力し、工作機械データベースを構築した。
    (2)フライス加工に限定し種々の工具のEXPRESSモデルを構築し、具体的データを入力し、工具データベースの構築した。
    (3)STEP/AP203形式の製品モデルの出力データから,加工特徴へ変換する変換ソフトウエアを開発して加工特徴データAP224への変換システムの構築を行った。
    (4)統合生産設計システムに必要な生産資源データベースシステムを工作機械データモデル、工具データモデルを入力とし、パーソナルコンピュータ上で実現した。
    (5)生産資源データベースと加工特徴入力CAMシステムとの統合により、統合生産設計システムを実現した。また種々の製品形状を入力とし、生産設計支援が実現できることを検証した。
    日本学術振興会, 基盤研究(B), 北海道大学, 12450053
  • 大規模分散制御型FA制御ソフトウエアのためのシームレス開発環境
    科学研究費補助金(基盤研究(B))
    2000年 - 2001年
    金井 理, 山元 進, 戸村 豊明, 岸浪 建史
    本研究の目的は,オブジェクト指向方法論を用い,大規模なFA用分散制御システムの効率的な設計・開発のための,システムのモデリング・シミュレーション・実装方法論とそのツール群を実用化することである。H13年度では,以下の成果が得られた.1)分散制御システムのシミュレーションモデル構築ツールの開発とシミュレータの実用性評価(戸村・山元) デザインパターンを応用し,Statechartsとイベント連鎖モデルで記述されるシミュレーションモデルを,Javaコードとして体系的に実装する方法を提案した.この方法を,CASEツールとJava開発ツールにより実装した.このシミュレータを,実用規模のエアコン制御用分散制御システムの設計と機能検証に利用した.その結果,シミュレーションモデル構築,および機能検証が約2週間で完了でき,従来に比べ,設計に要する時間が大幅に短縮されることが確認できた.2)分散制御システムのシミュレーションと実装の統合化(戸村・金井・山元) Javaコードで記述されたシミュレーションモデルから,Neuron-Cで記述される各制御ノード用の実装コードへの変換方法を,デザインパターンを応用し開発した.さらにこれを,LonWorksで制御されるFA用搬送装置の制御ソフトウェア開発に利用し,提案する変換方法論が有効であることを示した.3)Timed I/O StateChartsに基づく制御ノード用実装コードのソフトウエアテスト手法の開発(金井・岸浪) 状態遷移に加え,入出力動作に対する時間制約が記述できるTimed I/0 Statechart仕様から作成された実装コードに対し,網羅的にブラックボックステストを行えるテスト系列生成手法とテスト実施自動化ツールをJava言語で開発した.エアコン制御用コードのテストにこれを応用し,従来手作業で9日間を要したテストを,1日に短縮できることを実証した.
    文部科学省, 基盤研究(B), 北海道大学, 研究代表者, 競争的資金, 12555031
  • 電子透かし技術を用いた3次元形状モデルの著作権保護に関する研究
    科学研究費補助金(基盤研究(C))
    1999年 - 2000年
    金井 理, 岸浪 建史
    デジタルな,著作権情報を「透かしデータ」として,3次元形状モデルデータ内に第三者に気づかれないよう密かにかつ除去不能な形式で埋め込み,必要に応じてこの透かしデータを抽出できる技術(「電子透かし技術」)を開発することによって,形状モデルの著作権保護を実現しようというのが本研究の目的である.本研究では,商用のポリゴンモデリングソフトウエア(要求設備)を用い,実際規模のポリゴン・ソリッド・サーフェースモデルデータを夫々作成し,透かし情報埋込み→透かし入りモデルへの座標変換・形状修正等の操作→透かし情報の抽出,といった一連の処理を実施した.また透かしデータの残存性や埋込み容量,埋め込みで生ずる形状誤差などの性能を定量的に評価した結果,ポリゴンモデルのアフィン変換に対し,透かしデータが100%保存されること,透かし埋め込みによって生ずるモデル誤差の許容値を満たした透かし埋め込みが可能であること,局所的な座標値変更に対しても,低解像度レベルに埋め込まれた透かしデータは残存する頑強性をもつことなど,良好な特性があることが明らかになった.その反面,モデルの局所的な切り取り操作に対する耐性については,不十分であることが判明した.さらに,開発透かし手法を,「2次元ベクトル型図形データ」への電子透かし手法へも適用できるよう改良し,電子地図データに対する周波数領域での透かし埋め込み・抽出実験をも実施した.その結果,ベクトル型図形データの表示上の品質を保ちつつ,著作権保護などに必要な透かしデータ量を埋め込むことが可能であり,さらに頂点座標値へのランダムノイズ重畳に対しても,埋め込まれた透かしが十分な耐性を持つことを確認できた.今後は,モデルの局所的切取りなどの操作に対しても,充分な耐性を有する透かし埋め込み処理が可能なアルゴリズムへの改良が必要である.
    文部科学省, 基盤研究(C), 北海道大学, 研究代表者, 競争的資金, 11650113
  • 加工プロセスの形式表現と加工特徴モデルの体系化に関する研究
    科学研究費助成事業
    1998年 - 1999年
    岸浪 建史, 田中 文基, 金井 理
    CADとCAMの幾何形状の伝達においては機械加工の観点から加工特徴形状に人間が解釈し、CAMの入力とする事が一般的である。本研究では、設計から加工までのデータフローの流れを逆に捕らえ、下流から処理機構の数学的モデル化を行い、所望の出力を達成するための入カデータを逐次求めるボトムアップ的手法を提案し、以下の研究項目について研究を行い、それぞれ結論を得た。
    (1)形状創成関数によるNC加工プロセスの表現
    加工面生成のプロセスを、IDEF0図式表記法と数学的形式表現により機能分析をおこない加工プロセスモデルを構築した。また、加工面の性質を現す加工面が属する除去形状の性質、加工面の表面性状モデルを構築した。
    (2)加工プロセスの逆変換構造としての作業設計プロセスの表現
    (1)で導出された加工プロセスモデルの逆変換構造を基本に加工面性状モデルを入力して抽象NCデータを出力する作業設計プロセスモデルの構築を行った。このプロセスは、単純な数式で表現することが可能である。
    (3)作業設計プロセスの入力としての加工特徴モデルの構造とその表現
    (2)で構築した作業設計プロセスモデルの処理手順に一致する情報から構成される加工特徴モデルの構造と表現を情報モデル化言語EXPRESSを用いて表現した。
    (4)机上シミュレーションによる検証
    具体的機械加工部品を対象として、部品を構成する加工面毎に使用工具、工具運動を列挙し、抽象NCデータに机上で変換した。
    (5)計算機シミュレーションによる検証
    (4)でおこなった例題を対象として、加工特徴モデルと抽象NCデータの実装形式を定め、加工特徴モデルから抽象NCデータヘの変換を行う作業設計プロセスモデルと、抽象NCデータから加工特徴モデルを生成する加工プロセスモデルの実装及び、抽象NCデータの生成が可能であることと加工特徴モデルの生成が可能であることの検証を行った。
    日本学術振興会, 基盤研究(B), 北海道大学, 10450052
  • リサイクル性と破棄性の評価に基づく組立品の最適分解点決定の研究
    科学研究費補助金(基盤研究(C))
    1997年 - 1998年
    金井 理, 高橋 秀智, 岸浪 建史
    本研究は,家電品を対象に,そのリサイクル性と破棄性,ならびに分解・破砕・選別作業コストを評価しながら,最適な分解・破砕・選別処理プロセスを計画する計算機支援システムの開発を目的としている.本研究成果は,下記の通りまとめられる.(1) 「分解・破砕・材料選別の最適プロセス計画」問題の形式的定義を行った.すなわち,最適プロセス計画開題とは,使用済み製品の形態を,予め指定された回収条件(再使用,再利用,破棄)を満足する形態へ変換可能か否かを判定し,もし可能であれば,必要な分解・破砕・選別作業順序を決定する問題として定義できる.(2) 分解・破砕・選別における製品構造およびプロセス構造を,3種類のグラフにより形式的かつ統一的にモデリングする方法を提案した。(3) 分解・破砕・選別プロセス計画の立案アルゴリズムが,上記で提案したグラフベースのモデル上における接続構造変化とノード属性変化へ帰着させて統一的に記述可能であることを示した.またこれらのモデル変化における,変化適用ルールとモデル変化手順について議論した.(4) 実際の家電品データ(シェーバー,掃除機)に対するケーススタディを行い,本研究で提案するグラフベースのモデルおよび適用ルール・モデル変化手順に基づく,最適分解・破砕・選別プロセスの探索戦略が有効に機能することを示した.これらの結果より、提案するリサイクル性・破棄性の評価に基づいた組立品の最適分解点の決定が,計算機支援により可能であることが確認された.
    文部科学省, 基盤研究(C), 北海道大学, 研究代表者, 競争的資金, 09650124
  • 仮想世界の構成手法
    科学研究費助成事業
    1995年 - 1997年
    廣瀬 通孝, 金井 理, 横井 茂樹, 原島 博, 桐山 孝司, 池井 寧, 久保田 晃弘
    人工現実感の研究において,仮想世界の中に作り込む内容(コンテンツ)自体が重要な研究課題である。第3班の研究では多様な仮想世界を創出するための道具立てを整備し,それによってさまざまな仮想世界を創出し,その可能性について吟味することが目的となる。具体的な成果としては,以下の通りである。
    1.仮想世界提示用ワークベンチの開発:VR環境の整備をし,仮想世界を高い臨場感で体験するための多面形立体映像表示装置を開発した。あわせて,様々なソフトウエアをその環境において動作させるための基本ソフトウエアの開発を行った。
    2.シミュレーション世界の構築のための基本ソフトウエア:シミュレーションによって,仮想世界を創出するための基本的なソフトウエアの開発を行った。たとえば,仮想世界の構築のための物体の対話操作のシステムを作り,形状モデルを3次元的に確認・操作可能な人工現実感生成技術を開発した。仮想空間の物理法則をシミュレーションすることを試み,仮想物体同士が接触した際に,発生する挙動を検討し,接触と滑り,回転などの表現を実現した。
    3.様々なデータ源による仮想世界の演出:従来の,ポリゴンによる3D幾何モデルを使用しないで,仮想世界を創出するための方法論について,研究をした。仮想世界における映像生成時に実写映像を用い,映像的に質の高い仮想空間を構築した。特に大規模なウオークスルーを実現するために,広範囲にわたる画像データベースの取得やその管理,また,データベースから自由度の高い仮想空間を構築るための再構成手法を開発した。さらに,カメラで撮影した画像から三次元空間中における光線の振舞いを解析し,光線情報の不足している視点位置を探索しながら順次撮影を行うことにより,効率的に三次元空間情報を取得する手法を開発した。
    4.高速画像回線を用いたネットワーク型仮想世界の創出:ネットワーク上の展開した,あるいは,ネットワークを利用した仮想世界についての研究を行った。たとえば,機械の操作や組み立て等の三次元的な作業の遠隔指示を支援するシステムを開発した。特に,超広視野の映像を提供できる遠隔地間コミュニケーションシステムを開発し,人間の周辺視野部の映像が作業やコミュニケーションの中でどのような役割を果しているかを解明した。
    日本学術振興会, 重点領域研究, 東京大学, 07244104
  • 人工現実感を応用した自由曲面CAD/CAMシステムの開発
    科学研究費補助金
    1995年 - 1995年
    金井 理, 佐々木 哲夫, 岸浪 建史
    本研究は、金型自由曲面CAD/CAMシステムのヒューマンインターフェース部に人工現実感生成技術を導入し、仮想空間内の自由曲面モデル形状や工具モデルを直接操作しながらCAD/CAMシステムへ指示を与えることのできる「仮想クレイモデリングシステム」ならびに「仮想倣い加工システム」の試作と開発を行ない,その応答性およひ操作性を実験的に評価することを目的としている.本年度の研究実績は,以下のようにまとめられる.1.「仮想クレイモデリングシステム」の開発においては,自由曲面の切削による造形作業を仮想空間内で模擬するため,切削工具の運動を認識し,形状モデルからの疑似的な切削抵抗を操作者へ提示可能な,受動形力提示デバイスを用いたシステムを試作した.まず,実験に基づいた切削抵抗予測式の構築法,切削による形状変化をリアルタイムに計算するZ-mapデータに基づく切削シミュレーションアルゴリズム,Z-mapデータから曲面形状モデルへの変換手法を明らかにした.次いで,力提示デバイスを電磁パウダーブレーキを用いて実現し,自由曲面形状モデルの造形が可能であることを実験的に確認した.さらに,仮想空間における工具の位置決め実験を行うことにより,切削抵抗の力フィードバックを与えた場合,形状モデルに対する切削工具モデルの位置決め精度,操作時間を共に向上できることを実験的に検証した.2.「仮想倣い加工システム」の開発においては,仮想空間内において曲面形状モデル表面を倣うことのできる能動形力覚提示デバイスを用いて,曲面切削用の工具経路データを直接操作で能率良く教示できるシステムを試作した.まず、リニアサーボモータユニット3台に力帰還形制御を適用し,高い応答性と剛性を有する能動形力覚提示デバイスを作成した.また,自由曲面形状モデルに対するプローブモデルの高速干渉チェックアルゴリズム,ならびにプローブモデルをモデル上へ高精度に位置決めするための補正アルゴリズムを明らかにした.さらに仮想空間内での倣い作業実験を行い,本システムが制御周期3ms以内,工具経路生成精度±0.1μmなる性能を有しており,曲面切削用NCプログラミングへ十分利用可能であることを確認した.
    文部科学省, 試験研究(B), 北海道大学, 研究代表者, 競争的資金, 07555359
  • 機械製品のフレキシブル微小調整セルの研究
    科学研究費補助金(一般研究(C))
    1993年 - 1994年
    金井 理, 高橋 秀智
    (1)直交2軸の水平多関節型位置決め装置の先端に,開発した積層形圧電素子を用いたマイクロインパクトハンマー(MIH)を装着した.この装置をもちいて,治具ベースプレート上にボルト締結された部品の平面内における位置偏差および姿勢偏差を組立誤差の許容値内に収めるよう自動微小調整させた.その結果,開発した装置により,初期偏差として位置偏差30μm,姿勢偏差0.001radをもった治具部品を,位置偏差5μm,姿勢偏差0.0002radの組立誤差許容値内に安定して調整できることを実験的に確認した.(2)一般的な機械部品の調整アルゴリズム構築を目的として,複数の締結部品のそれぞれの位置,姿勢偏差からそれらの組立誤差の最大値を3次元的に解析可能な手法を開発した.すなわち,個々の部品の偏差を3次元微小座標変換で表現し,組立品におけるそれらの累積値を線形計画法により効率的に算出する方法を提案した.さらに,組立誤差を許容値内に収めるために,個々の部品の位置・姿勢偏差の許容値である寸法公差値・幾何公差値をどのように配分すべきかについて理論的考察を行い,これを非線形最適化問題として表現し,遺伝的アルゴリズムによりこの問題を有限時間内に解くための手法を提案し,加工コスト・組立コスト・検査コストの和が最小となるような公差値を導出するためのシステムを作成した.
    文部科学省, 一般研究(C), 東京工業大学, 研究代表者, 競争的資金, 05650111
  • 統合型組立工程設計支援システムの研究
    科学研究費補助金(一般研究(C))
    1990年 - 1991年
    金井 理, 高橋 秀智
    本研究の目的は、組立工程設計で必要となる処理を統合的に支援するソフトウェア環境を開発することである。本研究により得られた成果は以下の通りである。1.組立対象製品および組立設備の構造計算機内での統一的な表現を行うデ-タモデルとしてEAR(実体関連)モデルを導入した。このモデルにより、組立設備の動作、設備間の動作優先順序関係をも記述可能な基本モデリングソフトウェアをLISP言語により開発した。2.製品組立情報として、各部品のソリッドモデルおよびLISPで表現された部品間接触拘束条件に基づく、製品モデルの組立分解手順生成モジュ-ルを開発し、組立順序の自動生成を可能とした。3.モ-タ・空気圧シリンダ・ベアリング・リニアガイドなどの機械要素を組合せ、組みつけ動作を実現できる機構のモデリング、および数式処理システムとシ-ケンス制御回路デ-タに基づいその機構の動作シミュレ-ションが可能な組立機械機構モデリングモジュ-ルを開発した。4.組立セルの制御プログラムの自動生成を目的とした、CASEシステムモジュ-ルを開発した。このモジュ-ルにより、各種センサ-、垂直多関節型ロボット、パ-ソコンで構成される組立セルの部品供給作業を対象とし、デ-タフロ-図による作業の要求仕様分析と構造化設計を行い、制御プログラムのC言語ソ-スファイルを半自動的に生成可能であることを実証した。
    文部科学省, 一般研究(C), 東京工業大学, 研究代表者, 競争的資金, 02650086
  • 金型設計・製造のためのエキスパートシステムの開発に関する研究
    科学研究費助成事業
    1989年 - 1990年
    斉藤 勝政, 金井 理, 佐々木 哲夫, 楢原 弘之, 三好 隆志
    金型製造工程における問題点の1つは成形加工との関連で決定される設計工程であり、2つには金型熟練工のノウハウにより処理されている金型自由曲面の仕上加工工程である。特にプラスチック成形金型の加工工程において、平滑加工や磨き加工などの仕上げ加工は、加工全工程の約30%以上を占めているにもかかわらず、手作業で行う割合が高く、金型製作時間の短縮と高精度化の隘路となっている。
    そこで、金型磨き熟練工が持っている専門的な知識や技術を科学的に分析し、それらを基にして金型仕上加工の自動化を可能とする金型磨き作業を支援するためのエキスパートシステムの開発を行った。
    本試験研究においては、まず
    1、金型熟練工の磨き作業に対する知識を、ある金型メーカーの作業標準書からとアンケート調査によって収集し、その内容の分析を行ない磨き工具の使用手順決定に関する生産知識情報を蓄積した。
    2、知識データベースを基にして平面を対象として、前加工面の粗さと傷を除去し、最終的に要求金型仕上げ面状態を能率的に達成できる工具とその使用手順、磨き回数を教示するキスパートシステムを構築した。
    3、エキスパートシステムの中核となる知識ベースを構築するために、金型熟練工による手仕上げとNC立フライス盤を用いた自動磨き加工の加工能率を比較検討し、金型仕上作業の知識獲得とその定量化を図った。
    4、これらの知識ベースを基にして、エキスパートシステムによる推論を実行し、その推論結果と熟練工の手磨き結果を比較し、本システムの妥当性を検討した。
    5、本エキスパートシステムをさらに能率よく、作業現場に適用して金型仕上加工の自動化を進めるためには、磨き作業者の熟練技能を代行できる各種センサ、アクチュレータの研究開発が必要である。
    日本学術振興会, 試験研究, 北海道大学, 01850029
  • 自律分散生産システムにおける知的モデルとコミニュケーション
    科学研究費助成事業
    1989年 - 1990年
    岸浪 建史, 森脇 俊道, 鈴木 宏正, 伊東 誼, 古川 勇二, 金井 理
    次世代生産技術の基本となるであろう自律分散生産システムにおける知的モデルとコミニュケーションに関して7大学10研究者により総合的観点から調査研究を行い以下の結論を得た。
    1)自律分散生産システムの構造を明かにするため、
    -自律分散生産システムの基本構造
    -製品モデルと知的データ構造
    -自律分散生産システムにおけるコミニュケーション
    -加工環境の認識
    -生産プロセスの制御機構と情報処理
    に調査研究テーマを分担し、それぞれの専門家の視点から総合的に本研究成果を取りまとめた。
    2)自律分散生産システムの定義を自己の行為を検証できるシステムと定義することにより、生産活動の全てを計算機の空間にモデル化することの重要性を指摘し、計算機空間に生産活動のモデルを構築できたとき自律分散生産システムの実現が可能であることを指摘した。
    3)生産システムに於ける情報処理はきわめてオブジェクトオリエンテッド、すなわち、ある製品が与えられると、それを加工するに必要な工法、装置、工具、手順を作業者は即座に判断して遂行している。これを機械に実現させるには目的情報が与えられたときそれを実現する情報を順序よく生成する情報の誘発機構が重要であることを指摘し、製品モデルの必要機能を論じた。また情報の誘発機構について考察を加えた。
    4)自律分散システムにおけるコミニュケーションの昨日をCAD/CAMシステムにおけるデータ交換を具体例として、コンテクス依存型コミニュケーションの必然性を指摘し、個々の生産機器が情報を判断する知識を持つインテリジェント機械の必要性を指摘した。
    5)自律分散生産システムの定義より自己を取り巻く環境及び行為をも認識できなければならい。このために自己を取り巻く環境の工学的認識手法と加工現象の認識方法の方法とその指針を与えた。
    日本学術振興会, 総合研究(A), 北海道大学, 01302027
  • 大型鋳鍛造品の自動加工準備作業装置の開発
    科学研究費助成事業
    1988年 - 1990年
    岸浪 建史, 伯田 賢司, 早川 保, 横内 弘宇, 金井 理, 斎藤 勝政
    大型鋳鍛造品の加工準備作業における最大の問題は素材形成の問題である。すなわち素材形状の認識とは、素材形状の計測と製品形状を包含することを認識し、製品形状と素材形状の相対的位置関係を明らかにすることである。本年度においては素材形状の測定計測手段の開発と素材形状と製品形状の相対的位置決定方法の研究に重点を置き以下の成果を得た。
    1)多点レ-ザ-・スポット距離計の原理と試作
    素材形状測定時間の短縮を目的とし、測定点の位置制御としてビ-ム駆動方式の採用と多点同時測定を可能とする多点レ-ザ・スポット距離計の原理の提案を行った。すなわち、単一レ-ザ・スポット像の2台のカメラによる3次元位置座標の検出原理を明かにし、多点レ-ザ・スポット像においても検出可能であることを明らかにし、提案する原理に基づき多点レ-ザ・スポット距離計の試作開発を行った。すなわち2台のミラ-駆動系によるレ-ザ・ビ-ム駆動系を開発した。これにより単一レ-ザ・ビ-ムの高速駆動が可能となり、次に2枚のハ-フミラ-による多点レ-ザ・ビ-ム生成機構を提案し、多点レ-ザ・ビ-ム距離系を実現した。開発した距離計は従来の距離計に比較して、2桁の測定時間の短縮が可能となった。
    2)素材形状と製品形状の相対位置決定法
    CADモデルは数学モデルで与えられるが、素材形状測定デ-タは離散測定デ-タである、両者の相対位置決定アルゴリズムはこのことを前提に行わなければならない。本研究ではCADモデルを計算機空間で仮想的に測定を行い離散測定デ-タへ変換し、離散デ-タを用いた相対的位置決定法を明らかにした。
    日本学術振興会, 試験研究(B), 北海道大学, 63850027
  • 金型磨き作業の動作解析と自動化に関する研究
    科学研究費助成事業
    1988年 - 1989年
    三好 隆志, 斎藤 勝政, 金井 理
    金型製造工程の形状加工にはNC工作機械などがすでに導入され自動化が図られているが、磨き加工は依然として熟練工の手作業にたよっているのが現状である。しかし、最近、金型磨きロボットや自動磨き機の開発研究が進められ、一部金型磨き作業の自動化もなされているが、磨きの加工特性やそのメカニズムに関する研究は遅れており、人間の技能によって得られた面に比べて必ずしも良好と言えず、研磨に長時間を費やしておりまだ多くの問題点を残している。そこで、本研究は金型熟練工(エキスパ-ト)が長年の経験から得た知識と技能を再度見直すことによって、より能率的で高精度な金型磨き作業の自動化を図ることを目的としたものである。
    金型磨き作業の知識獲得に関する熟練工の手磨き及び自動磨きの実験さらに熟練工の知識に基ずいて試作した金型自動磨き工具による磨き加工実験より次のような研究成果が得られた。
    (1)いずれの磨き工具の場合も前加工面の粗さは研磨回数の増加とともに指数関数的に改善され、仕上面粗さRは前加工面粗さR_0、最終仕上面粗さReおよび指数定数aによって決定される。
    (2)自動磨きと手磨きでは、手磨きの方が仕上面粗さは良く、除去能率も高く、また面につける傷も小さくなる傾向がある。
    (3)除去深さの特性曲線は2つの直線に近似することができ、その折れ点(交点)を示す研磨回数は改善可能な仕上面粗さの回数と良く一致している。
    (4)試作した金型自動磨き工具は熟練工の磨き作業と変わらない良好な仕上面粗さを能率的に得ることができる。
    (5)磨き回数を砥石1回転当りの送り速度で割った磨きパラメ-タを導入することによって、除去深さおよび仕上面粗さを加工条件によらず統一的にしかも定量的に取り扱うことが可能になった。
    日本学術振興会, 一般研究(C), 北海道大学, 63550093
  • 形状加工シュミレ-タに関する研究
    科学研究費助成事業
    1988年 - 1989年
    岸浪 建史, 田中 文基, 金井 理, 斎藤 勝政
    形状加工シュミレ-タの開発は、生産システムの自動化を高めるための一手段である。すなわち、形状加工シュミレ-タは実際に加工現象を事前に予測することができ、CAMシステムにおける有力な検証手段と考えられるためである。しかし、形状加工シュミレ-タは幾何形状の高速干渉処理を可能とする処理アリゴリズムを必要としているめ、CADにおける幾何モデルを基にするシュミレ-タは干渉処理の高速化に有効な手法がなく、実用的形状加工シュミレ-タは未だ実現されていない。前年度研究では、物本形状の干渉処理の高速化を実現するため、Voxelデ-タ構造による加工シュミレ-タの開発を目的とし研究を行った。そこで本年度は、開発した加工シュミレ-タの具体的応用とその総合的評価を行うために以下の研究項目に関して研究を行った。
    1)工具干渉情報を利用したNCデ-タ自動修正処理機能の開発
    2)格子空間情報の高速・高精度画像表示アルゴリズムの開発
    また、加工シュミレ-タの基礎理論の研究を新たに平成元年度において研究を開始し、形状加工の数学的モデルの構築が可能であることを明らかにした。
    日本学術振興会, 一般研究(C), 北海道大学, 63550092

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