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Verification of the Backscattering Strength Based on the Swimming Behavior of Antarctic Krill
Inwoo Han,오우석,나형술,최석관,강수경,Euna Yoon,이경훈 한국해양과학기술원 2020 Ocean science journal Vol.55 No.3
This study provides an estimate of the SDWBA-modelled mean target strength for given sets of krill length and swimming orientation. The range of the dB identification window for krill length was between 28 mm and 67 mm and the distribution of swimming orientation N[11.0 degrees, 4.0 degrees] was estimated to be between 0.06-10.97 dB, while the range estimated using N[53.1 degrees, 21.4 degrees], i.e., the distribution of orientation obtained under the brightest illuminance level, was 5.21-9.82 dB. The range of the dB window calculated using N[45.2 degrees, 23.0 degrees], obtained under the second brightest illuminance level, was 3.83-11.76 dB, and the range calculated with N[48.1 degrees, 23.0 degrees], obtained under the third illuminance level, was 3.83-11.76 dB. The range of the dB window calculated by N[45.9 degrees, 23.0 degrees] was 3.41-11.75 dB, and the range of the dB window for krill length ranging from 28 mm to 67 mm was 4.05-11.34 dB. In all the swimming orientations, the smaller the krill size was the lower the averaged target strength value was; likewise, the larger the krill size was the higher the averaged target strength value was. The result indicated that swimming orientation impacted greatly on the range of frequency differences of Antarctic krill.
한인우(Inwoo HAN),김관대(Gwandae KIM),김용수(Yongsoo KIM),이경훈(Kyounghoon LEE) 전남대학교 어업기술연구소 2016 어업기술연구소보고지 Vol.9 No.1
The purpose of this study was to investigate the energy consumption and greenhouse gas emissions according to fuel consumption in the littoral sea fishery. The fishing boat in the Korean littoral zone is currently registered at 68.000 vessels, most fishing vessels are almost over 70% got an aged are concentrated between 10-20 years so that its engine efficiency is terribly poor. Fishing environment of hazardous substances and greenhouse gas emissions from the engine is a high situation. In study, it needs to build a database of greenhouse gas emissions by sector, and it will be the corresponding plan for carbon reduction in the fisheries by Tier-1 evaluation on IPCC 2006 Guidelines.