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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.
최찬문,안장영,서두옥,정용진 濟州大學校 海洋硏究所 2004 해양과환경연구소 연구논문집 Vol.28 No.1
제주대학교 실습선 아라호에 장착된 능동형 횡 동요 감쇠장치의 성능이 선박의 속력과의 관계를 파악 하기 위하여 선박을 정지, 미속, 중속, 전속으로 구분하여 횡 동요 감쇠장치를 정지(Passive A.R.T), 작동(Active A.R.T)을 했을 때 경사계에 의한 횡 동요각 및 종 동요각, 풍속계에 의한 풍속의 변화에 의한 분석한 결과를 요약하면 다음과 같다. 1. 선박이 정지했을 때가 능동형 횡 동요 감쇠장치의 1/3, 1/10 횡 동요각 유의 진폭에서 감소률이 가장 높아 47.2%, 50.3%를 나타냈으며, 반면에 중속인 경우 가장 낮은7.1%, 7.4% 나타내므로, 이 장치는 선속의 변화에 차이가 있는 것으로 판단된다. 2. 선속의 변화에 따라 그 효율이 많은 차이가 있으므로 이 장치를 장착한 선박의 운항자는 이를 감안하여 작동하여야 할 것으로 생각되며, 통계분석 결과에 의해서 선속과 감소률의 관계를 회귀분석식으로 나타내어 보면 다음과 같았다. 즉, 횡동요각 유의 진폭 (Amplitude of and significant roll (φ_(1/3)) : y= -3.233χ + 45.613 횡동요각 유의 진폭 (Amplitude of and significant roll (φ_(1/10)) : y= -3.157χ + 46.840을 각각 얻을 수 있었다. This experimental paper deals with the performance of tanks that are turned the active A.R.T(Anti-Rolling Tank) when the fluid transfers from wing tanks to the opposite tank by the power developed by the automatic control system (INTERING Stabilizer), which was installed in the fishery training ship T/S. A - RA (G/T : 990 tons) of Cheju National University. In this paper, the author has tested the performance of INTERING Stabilizer from the signals obtained by the inclinometer in irregular waves and compared with the results obtained in passive mode operation at stop and at various ship speeds. The performances of the system were confirmed the results as follows through the tests : 1. The Rates of reduction in significant roll(φ_(1/3)) of performance of Active-Rolling Tank at stop. dead slow ahead, half ahead, full ahead were obtained 47.2%, 26.3%, 7.7% 9.7%, respectively. 2. The operators had to consider to be different to change according to the various ship speeds for working. and the author could get the linea regressions about the rates of reduction at the results of a statistical analysis through the time histories of rolling angles in A.R.T. in irregular waves using various ship's speeds. Rates of reduction in significant roll(φ_(1/3)) : y = -3.233χ + 45.613 Rates of reduction in significant roll(φ_(1/10)) : y = -3.157χ + 46.840