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김문관 ( Mun-kwan Kim ),박수현 ( Su-hyeon Park ),강형철 ( Hyeong-cheol Kang ),오태철 ( Tae-cheol Oh ),박용석 ( Yong-seok Park ),안영일 ( Young-il An ),김석종 ( Suk-jong Kim ) 한국어업기술학회 2017 수산해양기술연구 Vol.53 No.2
To improve the efficiency of hairtail trolling, it is important to gain an accurate understanding of the distribution of fish based on their diurnal vertical migration patterns. This study evaluated the vertical distribution of hairtails through catch efficiency tests using vertical longlines. Five replicate tests of the efficiency were carried out on the eastern coast of Jeju Island from August to September 2016, from 11:00 AM to 03:00 PM in the daytime and 11:00 PM to 03:00 AM in the nighttime. The fishing gear was composed of 20 hooks per line set, numbered in order from the first hook near the surface to the last hook on the seabed. The depth of the first hook was 18 m, and that of the last hook was 86 m. Pacific saury was used as the baits. In total, 10 sets of fishing gear were used per trip. After fishing, we counted the hairtails at each numbered hook, which were summed up both by number and in aggregate. A total of 232 hairtails were caught using 2,000 hooks: 193 individuals at daytime and 39 at nighttime. The hook rate was 11.5% : 9.6% at daytime; 2.0% at nighttime. For both daytime and nighttime catches, there were variations in the hook rates at each numbered hook. In the daytime, a maximum of 28.5% catches occurred at hook number 18, followed by 21.4% at number 20, and 10.7% at number 17, accounting for 60.6% of the daytime hook rates. In the nighttime, a maximum of 23.0% catches occurred at hook number 1, followed by 15.3% at hook number 4 and 9, accounting for 53.6% of the nighttime hook rate. Based on the above results, hairtails are usually distributed in deeper region in daytime, whereas they occur near the surface in nighttime. Therefore, it is necessary to position trolling lines according to diurnal vertical distribution layers of hairtails for fishing efficiency.
전필규(Phil-gyu Jeon),김득상(Duk-Sang Kim),안석종(Seok-jong An),양승일(Seung-Il Yang),허민(Min Heo),조용석(Yong-Seok Cho) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_2
In new generation vehicle technologies, vehicles powered by electricity become much more important, by virtue of their emission merits. In addition, fuel cell is considered as a major source to generate the electricity for vehicles in near future. This paper focuses on modeling of an electric vehicle to estimate performances and design of an EV cart to verify the modeling. The EV cart is composed of DC motor. battery and PWM controller and their specitications are measured and applied to simulation. The numerical model is able to estimate vehicle speed, voltage, current, and sac from fundamental equations. Data from modeling and EV cart are compared in maximum speed mode and driving cycle mode. The profiles of voltage, current which is supplied to motor, and vehicle speed from the model show good agreement with vehicle tests but transition effects.