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Akira Asada / Professor / Graduate School of Frontier Sciences
Ocean Technology, Policy, and Environment / / Underwater Acoustic Systems Engineering
http://unac.iis.u-tokyo.ac.jp/

Career Summary
1977: B.Eng., Fac. of Science and Engineering, Waseda University
1977-78: Engineer, Suwa Seikosha Co., Ltd.
1979-82: Engineer, Hydrographic Surveys Div., Hydrographic and Oceanographic Dept., Japan Coast Guard
1982-84: Engineer, International Div., Minister's Secretariat, Ministry of Transportation
1984-94: (Principal, Senior) Hydrographic Surveys Officer, Hydrographic and Oceanographic Dept., Japan Coast Guard
1995: D.Sc., The University of Tokyo
1994-2000: Principal Ocean Research Officer, Hydrographic and Oceanographic Dept., Japan Coast Guard
2000-present: Professor, Institute of Industrial Science, The University of Tokyo
Educational Activities
Postgraduate Courses: Underwater Acoustic Measurement
Undergraduate Courses: Underwater Technology
Research Activities
Highly accurate positioning and mapping of seafloor topography in terms of AUV skimming surveys (2008-)
Measurement of cobalt-rich-crust layer thickness with advanced sonar technology (2008-)
Inspection of underwater port structures with acoustic video cameras (2007-)
Growth measurements in fish farming with acoustic video cameras (2008-)
Development of underwater security sonar system (2005-)
Development of seafloor geodetic observation system based on AUV and seafloor platform technologies (2005-)
Centimeter level seafloor geodetic observation (2000-)
Development of high speed underwater acoustic network (2005-)
Development of non-contact underwater power supply system (2005-)
Development of advanced bathymetric survey method based on interferometric and synthetic aperture sonar techniques (2001-)
Development of inspection method for underwater deteriorated structure using underwater acoustic video camera (2007-)
Development of observation system for underwater plants and animals based on underwater acoustic sonar techniques (2005-)
Development of surveillance method for indistinct floating mud layer in shallow coastal water based on underwater acoustic sonar techniques (2005-)
Development of extensive bathymetric survey method for shallow coastal area based on interferometric sidescan sonar system (2007-)
Development of high-accuracy positioning method for areas surrounded by high-rise impeditive structures (2002-)

Underwater Security Sonar Systems
Underwater Security Sonar Systems


Seafloor Geodetic Observation System with AUV
Seafloor Geodetic Observation System with AUV


Advanced Sonar Technologies for AUV Skimming Survey
Advanced Sonar Technologies for AUV Skimming Survey

Literature
1) Han, Asada, Ura, Yamaguchi, Yagita, Maki: Noncontact power supply for seafloor geodetic observing robot system. J. Mar. Sci. Tech. 12 (2008) 183-189.
2) Asada, Mochizuki, Ura et al.: Evaluation result of new seafloor mirror transponder and AUV observation system in seafloor geodetic observation. Proc. OCEANS'07. 061215-094. (2007) (CD-ROM).
3) Asada, Maeda et al.: Advanced surveillance technology in underwater security sonar systems. Proc. OCEANS'07. 061213-002. (2007) (CD-ROM).
4) Mochizuki, Asada et al.: Development of seaflooor geodetic observation system based on AUV technology. Proc. UT'07. (2007) (CD-ROM).
5) Maeda, Asada, et al., Hantani: Development of diver detection and sensor integration for wharf surveillance software. Proc. UT'07. (2007) (CD-ROM).
6) Koyama, Asada et al., Nagahashi: Bathymetric survey at hydrothermal site by L-array interferometric sonar mounted on AUV-r2D4. Proc. UT'07. (2007) (CD-ROM).
7) Han, Asada: Acoustic counting method of upstream juvenile ayu plecoglossus altivelis by using DIDSON. Proc. UT'07. (2007) (CD-ROM).
8) Han, Asada, Yagita: High speed acoustic network with 2MHz carrier frequency for seafloor geodetic robot system. Proc. UT'07. (2007) (CD-ROM).
9) Han, Asada, Yagita: New USB-based 3D digital echo sounder system for mapping and assessing fish and aquatic plants. Fisheries Sci. 73(4) (2007) 770-776.
10) Asada, Ura et al., Nagahashi: Performance evaluation of advanced seafloor geodetic observation system using autonomous underwater vehicle. 2007 Proc. Meet. Marine. Acoust. Soc. Japan. (2007) 117-120 (in Japanese).
11) Mochizuki, Narita et al., Asada: Acoustic phase characteristics and phase centers of acoustic transducers for seafloor geodetic observation. Rep. Hydro. & Oceano. Researches. 43 (2007) 29-36 (in Japanese).
12) Asada, Ura et al.: First sea-trial of advanced seafloor geodetic observation system using autonomous underwater vehicle. 2006 Proc. Meet. Marine. Acoust. Soc. Japan. (2006) 89-92 (in Japanese).
Other Activities
Marine Acoustic Society Japan (MASJ)
Japan Society for Marine Surveys and Technology (JSMST)
Acoustical Society of Japan (ASJ)
Seismological Society of Japan (SSJ)
IEEE OES Japan Chapter
American Geophysical Union (AGU)
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Future Plan
To develop ultimate underwater acoustic measurement technologies on seafloor mapping, underwater imaging, underwater navigation, and underwater telemetry for a symbolic relationship with the sea.
Messages to Students
I believe that God guided me to this field as my ultimate vocation.
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