• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2002.10a
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• pp.281-281
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• 2002

혼획 (by-catch, entanglement)은 목표 어종을 잡도록 허가된 어구에 고래가 얽히는 것을 말한다. 국제포경규제협약의 개정관리방법 (Revised management procedure, 1994)에서는 혼획을 고래류의 비자연사망으로 정의하고 자원평가와 포획쿼타 소진에 포함시키고 있다. 혼획의 관리를 위한 국내 규정으로서는 해양수산부의 고래포획금지이행지침$\boxUl$이 있다. 규정에는 그물에 얽혀 살아있을 때는 최선의 회생의 조치를 취하고 죽었을 경우, 동 지침의 혼획ㆍ좌초고래처리절차에 따르도록 하고 있다. (중략)

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2002.10a
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• pp.263-263
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• 2002

동해안에 서식하는 밍크고래의 분포와 풍도를 알기 위해서 거리표집법(Distance sampling)의 일종인 직선횡단선 조사법 (Line transect method)을 적용하여 5월 14일부터 6월 7일까지 25일간 동해일원에서 국립수산과학원 조사선 탐구 3호 (360 G/T)를 이용하여 조사를 하였다. 동해안을 연안과 외양으로 구분하여 7개의 소해역으로 나눈 뒤에, 각 소해역의 조사선 (Survey line)을 설정하였는데, 조사선의 시작점은 무작위로 선정하여 지그재그로 조사선을 결정하였다. (중략)

• 한국수산학회:학술대회논문집
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• 2005.05a
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• pp.93-94
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• 2005

• Journal of the Korean Society of Marine Environment & Safety
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• v.18 no.6
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• pp.505-513
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• 2012

To determine the concentration of trace metals in the tissues of whale from the coastal ocean of Korea, we measured the concentration of trace metals (Cu, Cd, Pb, As, Zn and Hg) in the organs (liver, intestine, muscle, epidermis and blubber) of minke whale entangled from the eastern coast of Korea in 2009. The highest and lowest concentrations of Cu, Cd, Zn, and Hg were found in the liver and blubber, respectively. In contrast, the highest and lowest concentration of As was found in the blubber and muscle, respectively. The accumulation trend of trace metals in the organs of minke whales was in the order Zn > Cu > As > Pb > Hg > Cd. The concentrations of Cu, As and Zn in liver and epidermic were higher in male than in female, whereas the concentrations of Cu and Pb in intestine and muscle were higher in female than in male. The mature individuals of minke whale were much higher Cd in liver, Cd and Hg in muscle, As and Hg in epidermic and blubber, Cd, As and Hg in intestine than immature individuals of minke whale.

• Journal of the Institute of Convergence Signal Processing
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• v.19 no.4
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• pp.147-152
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• 2018

Underwater transient signals are complex, variable and nonlinear, resulting in a difficulty in accurate modeling with reference patterns. We analyze one type of underwater transient signals, in the form of whale sounds, using the MFCC(Mel-Frequency Cepstral Constant) and synthesize them from the MFCC and the weighted $L_2$-norm minimization techniques. The whales in this experiments are Humpback whales, Right whales, Blue whales, Gray whales, Minke whales. The 20th MFCC coefficients are extracted from the original signals using the MATLAB programming and reconstructed using the weighted $L_2$-norm minimization with the inverse MFCC. Finally, we could find the optimum weighted factor, 3~4 for reconstruction of whale sounds.

• Journal of the Institute of Convergence Signal Processing
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• v.18 no.2
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• pp.43-48
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• 2017

The underwater transients signals contain the characteristics of complexity, time varying, nonlinear, and short duration. So it is very hard to model for these signals with reference patterns. In this paper we separate the whole length of signals into some short duration of constant length with overlapping frame by frame. The 20th LPC(Linear Predictive Coding) coefficients are extracted from the original signals using Durbin algorithm and applied to neural network. The 65% of whole signals were learned and 35% of the signals were tested in the neural network with two hidden layers. The types of the whales for sound classification are Blue whale, Dulsae whale, Gray whale, Humpback whale, Minke whale, and Northern Right whale. Finally, we could obtain more than 83% of classification rate from the test signals.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2003.10a
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• pp.75-78
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• 2003

고래류의 자원은 국제포경위원회(IWC)의 국제포경규제협약(ICRW) 의해서 1986년부터 상업포경업이 금지된이래 현재 전 세계적으로 꾸준히 증가되어, 최근 우리나라 연근해에서도 수년전까지만 해도 자취를 감추었던 고래류가 빈번히 출현하고 있으며, 특히 서해안에 상괭이군 동해안에 밍크고래군, 제주도 연안에 4월에서부터 9월 사이에 큰돌고래군이 유영하는 모습을 자주 볼 수가 있었다. (중략)

• Korean Journal of Environment and Ecology
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• v.25 no.2
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• pp.123-131
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• 2011

Seabird distribution in the East Sea was studied from April to May 2007 using line transect counts. We observed a total of 1,379 individuals of 23 species including 14 species of seabird. The overall seabird sighting rate was 2.5 birds $km^{-2}$. The Streaked shearwater(Calonectris leucomelas)(74.5%) was the numerically dominant species. Ancient murrelets(Synthliboramphus antiquus)(8.3%), red-throated divers(Gavia stellata)(5.0%), common terns(Sterna hirundo)(2.1%), Pacific divers(Gavia pacifica)(2.0%), and black-tailed gulls (Larus crassirostris)(1.1%) were also frequently observed. The sightings of seabirds was highest between $36^{\circ}N$ and $37^{\circ}N$ of the coastal area of the Korean peninsular. However, the index of species diversity(H') was higher between $35^{\circ}N$ and $36^{\circ}N$. The sighting rates of most observed species decreased with distance from the coastline. The distribution patterns of Streaked shearwater were linked to the variation in the distribution pattern of minke whales(Balaenoptera acutorostrata). Also, spatial segregation was found in the distributions of the two species of divers(Gavia spp.).

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.58 no.3
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• pp.281-287
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• 2022

The distributions of common minke whales observed in the East Sea in ten surveys in May of 2003, 2005, 2006, 2007, 2009, 2010, 2012, 2015, 2016 and 2020 were investigated using satellite sea surface temperature (SST) derived from the Moderate Resolution Imaging Spectrometer (MODIS). Most of the minke whales were observed in the waters off the Korean Peninsula at 36-38.5° N, which is expected as the highly productive coastal upwelling area. Yet, no minke whale was observed in 2006 when a relatively larger scale coastal upwelling occurred with SST at 11℃. In 2016 and 2020, the warm water higher than 17℃ extended widely in the area, and the minke whales were observed in the offshore waters, deeper than 1,000 m. 87.5% of minke whales observed in May appeared in the SST from 13 to 16℃, and they seemed to avoid relatively high temperatures. This suggests that optimum habitat water temperature of minke whales in May is 13-16℃. The SST in the area had risen 1.67℃ from 2003 to 2021, and it was remarkably higher than in other parts of the surrounding areas. The future temperature rising may change the route and timing of the migration of minke whales in the study area.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.42 no.6
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• pp.642-649
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• 2009

Line transect data from sighting surveys conducted in the East Sea, Korea in 2000, 2002, 2003, 2005 and 2006 were analysed to estimate densities and numbers of minke whale. The half-normal model was fit to the survey in 2000 and the uniform model was the most fitable to the survey in 2002 and 2006, and the surveys in 2003 and 2005 were fit by the hazard-rate model. The estimated density of minke whale in the survey in 2000 was estimated as 0.026 individuals/$km^2$ (CV=0.409; 95% CI 0.011-0.065) and was higher than the survey in 2002 estimated as 0.018 individuals/$km^2$ (CV=0.329; 95% CI: 0.009-0.034). The estimated density of minke whale in the survey in 2003 was estimated as 0.033 individuals/$km^2$ (95% CI: 0.008-0.139) with the highest CV 0.760. The highest density was estimated in the survey in 2005 with 0.053 individuals/$km^2$ (95% CI: 0.020-0.141). The Lowest CV (0.306) was estimated in the survey in 2006 with 0.025 individuals/$km^2$ (95% CI: 0.014-0.046). A total of 500 bootstrap samples were generated within each stratum. Density, CV and 95% CI of each surveys were increased than analytic results except the survey in 2003. There were no increasing or decreasing annual trends in the density of minke whales observed during the study period. A long-term monitor and survey is needed to assess project minke whale abundance in the East Sea.