Researcher Database

Yoshiaki Fukuda
School of Fisheries Sciences
Specially Appointed Assistant Professor

Researcher Profile and Settings

Affiliation

  • School of Fisheries Sciences

Job Title

  • Specially Appointed Assistant Professor

J-Global ID

Research Areas

  • Other / Other

Research Activities

Published Papers

  • FUKUDA Yoshiaki, MUKAI Tohru, SAWADA Kouichi, IIDA Kohji
    The Journal of the Marine Acoustics Society of Japan 特定非営利活動法人 海洋音響学会 40 (3) 138 - 148 0916-5835 2013 [Refereed][Not invited]
     
    The target strength (TS) spectrum of a marine organism is a key factor in the target discrimination of that organism. In this study, the side-aspect TS spectrum of <i>Euphausia pacifica</i> was measured as a function of the incident angle of the ensonified wave in a seawater tank using a broadband transducer with a bandwidth of 300–700 kHz. The measurements were compared with the theoretical predictions by the distorted-wave Born approximation-based deformed-cylinder model (DWBA model). The TS pattern measurements were in good agreement with the DWBA model predictions for the main lobe but not with those for the side lobe. The measurements of the relationship between the normalized mean TS spectrum and the total length divided by wavelength ratio were in good agreement with model predictions.
  • Yoshiaki Fukuda, Tohru Mukai, Kouichi Sawada, Kohji Iida
    NIPPON SUISAN GAKKAISHI 日本水産學會 78 (3) 388 - 398 0021-5392 2012/05 [Refereed][Not invited]
     
    Side-aspect target strengths (TS) of Euphausia pacifica (10.9 similar to 19.6 mm in total length [TL], n = 44) were measured as a function of the incident angle of the ensonified wave at 120 kHz and 200 kHz. These measurements were compared with the theoretical predictions by the Distorted-Wave Born Approximation-based deformed-cylinder model (DWBA model). The measurements agreed with the predictions. Dorsal-aspect TSs as a function of the incident angle of the ensonified wave were also predicted by taking the curvature of the body in their swimming condition into account. The relationship between the reduced maximum TS (TScm, max) in dorsal aspect by the DWBA model and the total length to wavelength ratio (TL/lambda) was expressed by TScm, max = 36.5 log TL/lambda-91.4.

Conference Activities & Talks

MISC



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