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안장영 ( Jang-young Ahn ),김광일 ( Kwang-il Kim ),김민선 ( Min-son Kim ),이창헌 ( Chang-heon Lee ) 한국수산해양기술학회 2021 수산해양기술연구 Vol.57 No.3
In this study, a drifting test using a experimental vessel (2,966 tons) in the northern waters of Jeju was carried out for the first time in order to obtain the fundamental data for drift. During the test, it was shown that the average leeway speed and direction by GPS position were 0.362 m/s and 155.54° respectively and the leeway rate for wind speed was 8.80%. The analysis of linear regression modes about leeway speed and direction of the experimental vessel indicated that wind or current (i.e. explanatory variable) had a greater influence upon response variable (e.g. leeway speed or direction) with the speed of the wind and current rather than their directions. On the other hand, the result of multiple regression model analysis was able to predict that the direction was negative, and it was demonstrated that predicted values of leeway speed and direction using an experimental vessel is to be more influential by current than wind while the leeway speed through variance and covariance was positive. In terms of the leeway direction of the experimental vessel, the same result of the leeway speed appeared except for a possibility of the existence of multi-collinearity. Then, it can be interpreted that the explanatory variables were less descriptive in the predicted values of the leeway direction. As a result, the prediction of leeway speed and direction can be demonstrated as following equations. Ŷ<sub>1</sub>= 0.4031-0.0032 X<sub>1</sub>+0.0631 X<sub>2</sub>-0.0010 X<sub>3</sub>+0.4110 X<sub>4</sub> Ŷ<sub>2</sub> = 0.4031-0.6662 X<sub>1</sub>+27.1955 X<sub>2</sub>-0.6787 X<sub>3</sub>-420.4833 X<sub>4</sub> However, many drift tests using actual vessels and various drifting objects will provide reasonable estimations, so that they can help search and rescue fishing gears as well.
안장영(Jang-Young AHN),이창헌(Chang-Heon LEE) 한국수산해양교육학회 2013 水産海洋敎育硏究 Vol.25 No.2
The auditory thresholds for 7 specimens of the sharp toothed eel Muraensox cinerus were measured at 5 frequencies by heartbeat conditioning method using pure tones coupled with a delayed electric shock. The audible range of the sharp toothed eel extended from 80㎐ to 300㎐ with the best sensitivity around 80㎐ and 100㎐. In addition, the auditory thresholds over 200㎐ increased rapidly. The mean auditory thresholds of the sharp toothed eel at the test frequencies of 80㎐, 100㎐, 200㎐ and 300㎐ were 87㏈, 86㏈, 105㏈ and 126㏈, respectively. Auditory masking was determined for the sharp toothed eel by using masking stimuli with the spectrum level range of about 70~80㏈ (0㏈ re 1μ㎩/√㎐). According to white noise level, the auditory thresholds increased as compared with thresholds in a quiet background noise. The noise spectrum level at the start of masking was distributed at the range of about 64㏈ within 80~100㎐. Critical ratio ranged from minimum 24㏈ to maximum 40㏈ at test frequencies of 80㎐~200㎐.
안장영 ( Jang Young Ahn ),박용석 ( Yong Seok Park ),최찬문 ( Chan Moon Choi ),김석종 ( Seok Jong Kim ),이창헌 ( Chang Heon Lee ) 한국어업기술학회 2012 수산해양기술연구 Vol.48 No.4
In order to obtain the fundamental data about the behavior of conger by underwater audible sound, this experiment was carried out to investigate the hearing ability of Conger eel Conger myriaster which was in the coast of Jeju Island by heartbeat conditioning method using pure tones coupled with a delayed electric shock. The audible range of conger eel extended from 50Hz to 300Hz with a peak sensitivity at 80Hz including less sensitivity over 200Hz. The mean auditory thresholds of conger eel at the frequencies of 50Hz, 80Hz, 100Hz, 200Hz and 300Hz were 105dB, 92dB, 96dB, 128dB and 140dB, respectively. The positive response of conger eel was not evident after the sound projection of over 200Hz. At the results, the sensitive frequency range of conger eel is narrow in spite of swim bladder. Auditory masking was determined for Conger eel by using masking stimuli with the spectrum level range of about 60~70dB (0dB re 1mPa/AHz ). According to white noise level, the auditory thresholds increased as compared with thresholds in a quiet background noise including critical ratio at 68dB of white noise from minimum 26dB to maximum 30dB at test frequencies of 80Hz and 100Hz. The noise spectrum level at the start of masking was distributed at the range of about 68dB within 80~100Hz.
안장영 ( Jang Young Ahn ),최찬문 ( Chan Moon Choi ),이창헌 ( Chang Heon Lee ) 한국어업기술학회 2011 수산해양기술연구 Vol.47 No.3
In order to obtain the fundamental data about the behavior of sharks by underwater audible sound, this experiment was carried out to investigate the auditory characteristics of tiger shark Scyliorhinus torazame which was caught in the coast of Jeju Island by heart rate conditioning method using pure tones coupled with a delayed electric shock. The audible range of tiger shark extended from 80Hz to 300Hz with a peak sensitivity at 80Hz including less sensitivity at 300Hz. The mean auditory thresholds of tiger shark at the frequencies of 80Hz, 100Hz, 200Hz and 300Hz were 90dB, 103dB, 94dB and 115dB, respectively. The positive response of tiger shark was not evident after the sound projection of over 300Hz. At the results, the sensitive frequency range of tiger shark is narrower than that of fish that has swim bladder. In addition, it is assumed that the most sensitive frequency in auditory thresholds of Chondrichthyes is lower than that of Osteichthyes. Critical ratios of tiger shark measured in the presence of masking noise in the spectrum level range of about 60-70dB (0dB re 1mPa/ Hz) increased from minimum 27dB to maximum 39dB at test frequencies of 80-200Hz. The noise spectrum level at the start of masking was distributed at the range of about 65dB within 80-200Hz.