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교정구에 의한 음향도플러유향유속계의 평균 체적후방산란강도 검토
양용수 ( Yong Su Yang ),이경훈 ( Kyoung Hoon Lee ),이대재 ( Dae Jae Lee ),이동길 ( Dong Gil Lee ) 한국어업기술학회 2014 수산해양기술연구 Vol.50 No.4
ADCPs have been widely used to estimate the dynamic characteristics and biomass of sound scattering layers (SSLs), and swimming speed of fish schools for analyzing SSLs spatial distribution and/or various behavior patterns. This result showed that the verification of the mean volume backscattering strength (MVBS or averaged SV, dB) acquired by the ADCP would be necessary for a quantitative analysis on the spatial distribution and the biomass estimation of the SSLs or fish school when ADCP is used for estimating their biomass. In addition, the calibrated sphere method was used to verify values of each MVBS obtained from 4 beams of ADCP (153.6 kHz) on the base of 3 frequencies (38, 120, 200 kHz) of Scientific echo sounder``s split beam system. Then, the measured SV values were compared and analyzed in its Target Strength (TS, dB) values estimated by a theoretical acoustic scattering model.
양용수 ( Yong Su Yang ),박성욱 ( Seong Wook Park ),이경훈 ( Kyoung Hoon Lee ),이동길 ( Dong Gil Lee ),정성재 ( Seong Jae Jeong ),배재현 ( Jae Hyun Bae ) 한국어업기술학회 2014 수산해양기술연구 Vol.50 No.2
The sea cage in marine aquaculture might be varied such as on the stability and shape in the open sea by environmental factors. To evaluate the stability of net cage structures in the open sea, the physical and numerical modeling techniques were applied and compared with field observations. This study was carried out to analyse the stability and the volume loss which would have an effect on the fish swimming behavior in the octagonal pillar type fish cage under the open sea. As a results, the volume loss ratio of the fish cage as measured using a depth sensor was indicated a value of the 30.3% under the current velocity (1.1m/s). The fish cage should be consisted of a concrete block with a weight over 10 tons, a mooring rope diameter over 28mm PP, and a shackle of 25mm under the current speed of 1m/sec for reasonable stability.
스테레오 카메라 기법을 이용한 참다랑어의 크기 및 유영속도 측정
양용수 ( Yong Su Yang ),이경훈 ( Kyoung Hoon Lee ),지승철 ( Seong Chul Ji ),정성재 ( Seong Jae Jeong ),김경민 ( Kyong Min Kim ),박성욱 ( Seong Wook Park ) 한국어업기술학회 2011 수산해양기술연구 Vol.47 No.3
This study was performed to develop a video based system which can be used to measure the averaged fish size in a non-intrusive fashion. The design was based on principles of simple stereo geometry, incorporated fish dimensions weight relationships and took into consideration fish movement to lower system costs. As the fish size is an important factor that impacts the economy of an aquaculture enterprise. Size measurements, including fork length, width or height, girth, thickness and mass, can be used to determine fish condition in the fish farm, so the averaged fish size of fish cage needs to consistently monitor in open ocean aquaculture cage. A precision of ±3% for replicate length measurements of a 60cm bar is obtained at distances between 2.0 and 6.0m, and the mean fork length and mean swimming speed of bluefin tuna were estimated to 48.8cm and 0.78FL/s, respectively.
전과정평가방법에 의한 쌍끌이 대형기선저인망의 온실가스 배출량 정량적 분석
양용수 ( Yong-su Yang ),이동길 ( Dong Gil Lee ),황보규 ( Bo Kyu Hwang ),이경훈 ( Kyoung Hoon Lee ),이지훈 ( Ji Hoon Lee ) 한국수산해양기술학회 2015 수산해양기술연구 Vol.51 No.1
The negative factors of fishery in environmental aspect of view are Greenhouse gas emission problems by high usage of fossil fuel, destruction of underwater ecosystem by bottom trawls, reduction of resources by fishing and damage of ecosystem diversity. Especially, the Greenhouse gas emission from fisheries is an important issue due to Cancun meeting, Mexico in 1992 and Kyoto protocol in 2005. However, the investigation on the GHG emissions from Korean fisheries did not much carry out. Therefore, the quantitative analysis of GHG emissions from Korean fishery industry is needed as a first step to find a relevant way to reduce GHG emissions from fisheries. The purpose of this research is to investigate which degree of GHG emitted from fishery. Here, we calculated the GHG emission from Korean bottom pair trawl fishery using the LCA (Life Cycle Assessment) method. The system boundary and input parameters for each process level are defined for LCA analysis. The fuel use coefficient of the fishery is also calculated. The GHG emissions from the representative fishes caught by bottom pair trawl will be dealt with. Furthermore, the GHG emissions for the edible weight of fishes are calculated with consideration to the different consuming areas and slaughtering process also. The results will be helpful to understand the circumstances of GHG emissions from Korean fisheries.
음향기술을 이용한 내수면 주요어종의 음향산란특성과 연직분포
양용수 ( Yong Su Yang ),이경훈 ( Kyoung Hoon Lee ),황보규 ( Bo Kyu Hwang ),이형빈 ( Hyung Been Lee ),김인옥 ( In Ok Kim ),김성훈 ( Seong Hun Kim ) 한국어업기술학회 2014 수산해양기술연구 Vol.50 No.4
This study is aimed to understand the vertical distribution of fish in the daytime and nighttime using an acoustic survey in Yondam reservoir of Jeollabuk-do, and an acoustical backscattering strength of dominant species, bass (Micropterus salmoides) and a bluegill (Lepomis macrochirus), which are classified as the ecosystem disturbing species. The results showed that the fish school was distributed in the shallow areas of less than 10 m depth during the period of Aug. and Oct. where it had a strong thermocline, otherwise, it was distributed over 10-times density under stable water temperatures as 13℃ in Nov. There was no vertical patchiness difference between daytime and nighttime unlike the typical marine ecosystem. The dominant species were crucian carp, bluegill, bass. The hydroacoustic method can provide the spatial distribution and effective removal ways of the ecosystem disturbing species in inland fisheries.
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.
배재현 ( Jaehyun Bae ),양용수 ( Yong-su Yang ),김현영 ( Hyun-young Kim ),황보규 ( Bo-kyu Hwang ),이춘우 ( Chun-woo Lee ),박수봉 ( Subong Park ),이지훈 ( Jihoon Lee ) 한국수산해양기술학회(구 한국어업기술학회) 2019 수산해양기술연구 Vol.55 No.1
The concern on the greenhouse gas emissions is increasing globally. Especially, the greenhouse gas emission from fisheries is an important issue from the Paris Climate Change Accord in 2015. Furthermore, the Korean government has a plan to reduce the GHG emissions as 4.8% compared to the BAU in fisheries until 2020. However, the investigation on the GHG emissions from Korean fisheries rarely carried out consistently. Therefore, the quantitative analysis of GHG emissions from Korean fishery industry is necessary as a first step to find a relevant way to reduce GHG emissions from fisheries. The purpose of this research is to investigate which degree of GHG emitted from the major offshore fisheries such as offshore gillnet fishery, offshore longline fishery, offshore jigging fishery and anchovy drag net fishery. Here, we calculated the GHG emissions from the fisheries using the Life Cycle Assessment method. The system boundary and input parameters for each process level are defined for the LCA analysis. The fuel use coefficients of the fisheries are also calculated according to the fuel type. The GHG emissions from sea activities by the fisheries will be dealt with. Furthermore, the GHG emissions for the unit weight of fishes are calculated with consideration to the different consuming areas as well. The results will be helpful to understand the circumstances of GHG emissions from Korean fisheries
폐어구로 인해 발생하는 유령어업 효과에 대한 실험적인 고찰
김성훈(Seonghun KIM),양용수(Yong-Su YANG),정주희(Juhui JEONG),송민수(Min-Su SONG),이도현(Doe-Hyeon LEE),최문보(Mun-Bo CHOI),차상훈(Sang-Hoon CHA),이창현(Chang-Hyeon LEE),김형석(Hyung-Seok KIM) 한국수산해양교육학회 2016 水産海洋敎育硏究 Vol.28 No.5
The aim of this study was to evaluate the impact on the fishery resources and marine ecosystems by derelict fishing gears as part of the R & E (Research and Education) program that supervised by the busan metropolitan city office of education. In this study, we verified the ghost fishing effects caused by derelict fishing gears through the process which fish were caught to be attracted to bait for gillnet and trap in tank. In results, the dead fish to be gilled in gillnet and to enter in pot have been shown to attract other fish to the bait role. The result showed that the ghost fishing was caused by abandoned, lost or discarded fishing gears continuously. In particular, as a result of pot experiment, if the lost pot has a escape device, the entered fish could escape from the pot and the fisheries resources could protect from derelict fishing gears. In addition, the high school students are capable of raising the problem solving skills through carrying out the research project and expect to contribute to raising awareness about the protection of the marine environment.