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수치해석기법을 이용한 에너지 저소비형 기선권현망어구 개발
양용수 ( Yong Su Yang ),이춘우 ( Chun Woo Lee ),이경훈 ( Kyoung Hoon Lee ),박수봉 ( Su Bong Park ),박성쾌 ( Seong Kwae Park ),강민주 ( Min Joo Kang ),이지훈 ( Ji Hoon Lee ) 한국어업기술학회 2013 수산해양기술연구 Vol.49 No.3
Fuel consumption in fisheries is a primary concern due to environmental effects and costs to fishermen. Much research has been carried out to reduce the fuel consumption related to fishing operations. The fuel consumption of fishing gear during fishing operation is generally related to hydrodynamic resistance on the gear. This research demonstrates a new approach using numerical methods to reduce fuel consumption. The results from the simulation were verified with results that mirrored the model experiments. By designing the fishing gear using drawing software, the whole and partial resistance force on the gear can be calculated as a result of simulations. The simulation results will suggest suitable materials or gear structure for reducing the hydrodynamic forces on the gear while maintaining the performance of the gear. Furthermore, the efficiency of low energy used anchovy dragnet as economic point of view will be dealt. This research will helpful to reduce the GHG emissions from fishing operations and lead to reduce fishing costs due to fuel savings.
김문관 ( Mun-kwan Kim ),박수현 ( Su-hyeon Park ),강형철 ( Hyeong-cheol Kang ),박용석 ( Yong-seok Park ),안영일 ( Young-il An ),이춘우 ( Chun-woo Lee ),박수봉 ( Su-bong Park ) 한국어업기술학회 2018 수산해양기술연구 Vol.54 No.2
In this study, we tested Japanese trolling lines in the Jeju fishery. This fishery simulates the natural marine environment with many seabed rocks, and has been redesigned and manufactured it to be suitable for the Jeju fishery. In order to ensure that the trolling lines were deployed at the inhabitation depth of hairtails, the conditions required for the fishing gear to reach the target depth were determined for use during the experiment. The experimental test fishing was conducted at the depth of 120 m water in front of Jeju Seongsanpo and in the offshore area of Jeju Hanlim. The fishing gear used in the test fishing is currently used in a variety of field operations in Japan. However, several problems were identified, such as twisting of the line during its deployment and excessive sinking of the main line. The fishing gear was, therefore, redesigned and manufactured to be more suitable for the Jeju fishery environment. For the fishing gear to accurately reach the target depth, depth loggers were installed at the starting point of the main line and at the 250 m and 340 m points of the line. Depth and time were recorded every 10 seconds. According to the daytime positioning of hairtails in the lower water column, the target depth of the fishing gear was set at 100-110 m, which was 10-20 m above the sea floor. At a speed of 1.9 knots and with a 9 kg sinker attached, the main fishing line was deployed and catch yields at depths of 100 m, 150 m and 180 m were recorded and analyzed. When the 180 m main line was fully deployed, the time for the hairtail trolling lines to arrive at the appropriate configuration had to be 5 minutes. At this time, the depth of the fishing gear was 16-23 m above the sea floor, in accordance with the depths at which the hairtails were during the day. In addition, in order to accurately place the fishing gear at the inhabitation water depth of hairtails, the experimental test fishing utilized the results of the depth testing that identified the conditions required for the fishing gear to reach the target depth, and the result was a catch of up to 97 kg a day.
Improved Design of the 2-D Quadrature Polar Separable Filter for Texture Processing
박종안,박수봉,Choy, Ik Su 대한전자공학회 1994 ISPACS:Intelligent Signal Processing and Communica Vol.1 No.1
An improved Quadrature Polar Separable(QPS) filter, which uses an exponential attenuation function and the shift parameter to the central frequency, is proposed in this paper. It is easier to control the frequency characteristics of the improved filter compared with Knutsson's. The central frequency change is simpler as it can be shifted algebraically. Tha filter symmetry is similar to the Knutsson filter. In order to estimate the orientation and the frequency component of local texture in the frequency domain, a series of experiments have been carried out, The results show that it can be used as an efficient tool in texture processing.