• 수산경영론집
• /
• 제33권2호
• /
• pp.31-48
• /
• 2002

This paper is aimed to analyze how to evaluate the choice of optimal management measures and level of control in fisheries management under the costly and imperfect management system by comparing with costless and perfect management system that is commonly assumed in the analysis of fisheries regulations. Fishermen would set the level of fishing efforts at the point where the marginal fishing profit for fishing effort is equal to the marginal level of fine under costly and imperfect management system. Therefore, under the case where the marginal fishing profit is higher than the marginal level of fine, the level of fishing efforts would be made at the point which is higher than the level of fishing efforts made under costless and perfect management system and is not a point where the economic profit is maximized in regulated fisheries. From this conclusion, the fishermens avoidance activities against regulations as well as the level of control in fisheries management substantially have an influence on the choice of fisheries management instruments. According to the analysis of optimal fisheries management policy, the economic profits in regulated fisheries are determined by the level of fisheries enforcement costs and total fishing profits, in which as enforcement costs increase the economic profits decrease. In addition, the economic profits vary in response to the level of control in avoidance activities. That is, as avoidance costs decrease, the economic profits increase. The determination of optimal level of control in fisheries management should be made at the point where the marginal regulation costs are equal to the marginal profits from regulated fisheries, in which marginal regulation costs are different according to the type of management measures. And the level of profits changes in response to different levels of avoidance activities. The management measure that can maximize the difference between the marginal regulation costs and marginal profits from regulated fisheries should be chosen as an optimal fisheries management instrument.

• Journal of the Optical Society of Korea
• /
• 제20권5호
• /
• pp.547-556
• /
• 2016

A fishing lamp is the instrument for attracting distributed fish to a certain place, and is the lighting system mainly used in fishery. In the inshore fishing, most fishing lamps are used for squid and hairtail jigging fishing, and the light source of the fishing lamps mainly used is metal halide with 1.5 KW in electric power consumption. We will analyze the irradiance distribution according to depth because squid is attracted towards light. To analyze irradiance distribution by such fishing lamps, data for seawater Type-II among the seawater types defined in 1976 are applied to East Sea. However, the Type-II data have limitations in analyzing precise seawater transmission characteristics, due to insufficient information on deep seawater. This paper analyzed the irradiance distribution of fishing lamps using the measurement of transmission characteristics in the seawater in East Sea up to 100 m underwater instead of Type-II data, which is not sufficient for transmission. A compensation factor was drawn between the actual measurement data and Type-II data through seawater transmission characteristics simulation.

• 수산해양기술연구
• /
• 제52권1호
• /
• pp.56-64
• /
• 2016

This study analyzed characteristics of officers' watch-keeping during fishing operation at the fisheries training ship KAYA (GT: 1,737 tons, Pukyong National University). It observed fishing works of three officers in wheel house of KAYA. The observations were carried out at the fishing ground 45 miles away from east of Jeju from 7 to 8 January 2010. The works and movements of the officers were recorded with three common video cameras and a 4-channel MPEG-4 Triplex DVR. Recorded data of the working circulation was analyzed by using the post-processing method. As a result of the traffic lines, the average (${\pm}S.D$) of working hour (min) and moving frequency (times), distance (m) and speed (m/min) during setting the net was 11.8 (0.9), 43.7 (8.1), 133.9 (35.8) and 10.5 (0.6), respectively. During trawling the net, it was 100, 241 (39.8), 615.7 (194.6) and 5.2 (1.6), respectively. During hauling the net, it was 17.6 (1.4), 41.0 (7.2), 196.9 (37.6) and 10.7 (0.8), respectively. In addition, it has a different tendency of the instrument usage frequency by the fishing works. During setting, the usage priority was CCTV, ECDIS, RPM and pitch controller, net monitor, GPS plotter, chart room, X-band radar, fish finder and public addressor. During trawling, it was CCTV, ECDIS, fish finder, X-band radar, net monitor, chart room, GPS plotter, RPM and pitch controller, auto pilot and steering, interphone, wind speed and direction indicator, No.1. VHF, navigation light control panel and public addressor. During hauling, it was CCTV, RPM and pitch controller, GPS plotter, public addressor, chart room, net monitor, X-band radar, auto pilot and steering and fish finder.

• Journal of applied mathematics & informatics
• /
• 제19권1_2호
• /
• pp.311-326
• /
• 2005

The paper deals with the problem of selective harvesting in a prey-predator model with predator self limitation. Criteria for local stability and global stability for both the exploited and unexploited system are derived. The effort has been considered as a dynamic variable and taxation as a control instrument to protect the fish populations from over exploitation. Finally, the optimal taxation policy is discussed with the help of control theory.

• 예술인문사회 융합 멀티미디어 논문지
• /
• 제9권2호
• /
• pp.469-480
• /
• 2019

본 연구는 죽방렴에 관한 역사적 근거를 찾고자 문헌적 고찰을 통하여 문화유산으로서의 가치를 보다 높이고, 그 기원을 증명하고자 하는 것이 목적이다. 우리나라는 예로부터 농업과 수산업을 중심으로 살아왔다. 과거 어로기술의 부족으로 어로도구가 충분치 않았던 시절에는 죽방렴은 국가의 중요한 어업자원이자 자산이었다. 죽방렴은 과학적 구조원리에 의해 만들어져 있어 우리 조상들의 지혜를 엿볼 수 있다. 죽방렴은 자연의 섭리에 순응하고 환경을 보호하는 어로방식이자 지역주민들의 공동체적 자산으로서 미래에도 전해주어야 할 문화유산이다. 문헌상 죽방렴의 기원은'어량' 또는 '방염'에서 찾을 수 있다. 이에 관한 기록은 고려시대까지 거슬러 올라가나 그 문헌적 기록이 희귀하며, 대부분이 조선시대의 기록들이다. 본 연구에서는 조선시대의 남해안 지역의 문헌적 기록들을 중심으로 조사, 연구하였다. 죽방렴에 대한 문헌적 기록에 대한 본 연구는 친환경적인 어로방식을 추구한 우리조상들의 문화자산을 지키는데 있어 매우 중요하며, 세계기록유산의 등재를 위한 기록물에 근거한 객관적인 자료를 만드는데도 매우 중요한 의의를 지닌다.

• 수산해양기술연구
• /
• 제29권1호
• /
• pp.21-29
• /
• 1993

한국의 연안어선에 장비된 소형자기컴퍼스의 장비현황과 성능을 연구하기 위하여 소형어선 219척의 선박제원과 자기컴퍼스 이용에 대한 현장 설문조사를 행하고, 그 중에서 총톤수 4-6톤급의 실험대상 어선 4척을 선정하여 그 선박의 자기컴퍼스의 설치위치별 자차측정과 성능실험을 행하고, 이를 검사, 조사하였다. 주요한 결과를 요약하면 다음과 같다. 1. 조사 대상으로 한 총톤수 1-10 톤급 연안어선 219척 중 4톤 미만의 어선은 약 50%를 차지하였고, 자기컴퍼스의 제작연도가 20-30년 경과된 어선이 14척이나 되었으며, 자차수정용구를 비치한 어선은 2척 뿐이었다. 2. 컴퍼스의 설치위치별로 측정된 자차를 분석한 결과, 기관실위의 브리지갑판상과 브리지내의 컴퍼스받침대위 및 브리지위의 컴퍼스 갑판상에 자차수정을 한 자기컴퍼스를 설치하여 사용하면, 브리지내의 컴퍼스대의 위와 브리지위의 컴퍼스 갑판상에서는 잔재자차가 $\pm$1~2 $^{\circ}$ 정도였으나, 기관실 위의 브리지갑판상에서는 그 잔재자차가 $\pm$5 $^{\circ}$로 이곳은 컴퍼스 설치 장소로서 부적당함을 알 수 있었다. 3. 연안어선에서 사용 중인 자기컴퍼스의 제반특성은 표준규격인 반주기의 평균치가 12초 이상이어야 하고, 3회 이상 진동해야하는 기준에 미달하였으며, 측정치인 자기능률 1400 CGS는 소형컴퍼스의 표준치 400$\pm$30 CGS와는 큰 차이가 있었다. 4. 실험 대상 어선에 장비하고 있는 자기컴퍼스의 수반각은 6~16 $^{\circ}$로서 한국표준규격인 1~1.5 $^{\circ}$에 비해 너무 크게 나타나 그 표준규격에 부적합한 것으로 판단되었다.

• 예술인문사회 융합 멀티미디어 논문지
• /
• 제8권12호
• /
• pp.425-435
• /
• 2018

본 연구는 경남 사천지역에 잔존해 있는 죽방렴의 실제 현황조사와 여러 역사적 문헌 고찰을 통해 죽방렴의 문화적 가치와 비즈니스 가치를 연구하여 지역문화자원으로서의 가치를 입증하고 세계농어업유산과 세계문화유산의 등재에 필요한 기초자료를 만드는 것이 목적이다. 농업과 더불어 수산업은 인류 역사에 있어 지대한 의미를 가진다. 특히, 삼면이 바다로 둘러싸인 우리나라의 지정학적 요인으로 인하여 매우 중요한 산업으로 발전하여 왔다. 그럼에도 불구하고 기르는 양식산업 이전 원시산업의 채집, 수렵할 때부터 이어온 여러 어로방식 중 실제로 남아있는 것은 거의 없는 실정이다. 경남 남해안의 사천과 남해지역에는 오백년 이전부터 지금까지 존재하여 실제로 운영하는 '죽방렴'이 있다. 이것은 예전부터 국가의 중요한 어업자원으로 관리되어져 왔다는 것을 여러 문헌적 연구를 통하여 알 수 있었다. 죽방렴은 자연지리적인 해협의 조류 흐름을 이용하여 고기를 채집하는 과학적 원리에 기초하여 만들어진 것으로 우리조상들의 지혜가 담긴 것이다. 조사결과, 죽방렴과 관련한 독특한 지역공동체의 문화가 존재하였으며, 주민들에게도 중요한 자산으로 관리되어져 왔다. 죽방렴은 이러한 역사, 인문학적 가치뿐만 아니라, 과학적 어로원리 이해교육과 해양어로작업 체험장과 같은 교육적 가치와 주변의 역사유적 및 지질환경자원과 연계하여 지역의 중요한 관광자원으로서 비즈니스적 가치를 지닌다. 결론적으로 죽방렴은 우리의 소중한 문화유산으로서 전승해야할 주요 자산인 것이다.

• 수산경영론집
• /
• 제33권2호
• /
• pp.127-152
• /
• 2002

This study intends to review the development of Large Purse Seine Fisheries in Korea and Japan, and subsequent changes in the fisheries regime as well as management conditions and to examine reorganization directions. In the Northeast Asian Fishing Area, each country has done mutual operation, which causes the fishery competition and controls fishery development. Besides, Exclusive Economic Zon(EEZ) established in 1996 resulted in the prominent changes of fishery development as well as fishery relationship among each country, demands reorganization of fisheries. In the Large Purse Seine fisheries, Korea and Japan are not decreasing, they are stable. In other words, the increase in one country does not necessarily make the decrease in the other country. This is a difference from the case of the bottom fishery. Japan is the highest in the cost, the management is getting worse due to decreasing fish price and shortage of labor. In the case of Korea, the stagnant productivity has been compensated by the rising fish price, but the fishery of low productivity to cut down the size. In addition, during the 1990s the environment of fishery is getting worse because of the free import fishery, shortage of labor, etc. Following the new fisheries paradigm, each country should reorganize its fisheries structure. The principle for reorganization of fisheries structure in each country should be focused on the establishment of sustainable fisheries. The reorganization of fisheries structure for each country by EEZ establishment does not mean only dividing fishing ground and fisheries resources by countries, but means that countries should cooperate together in fisheries management for long-run benefits from fisheries.

• 수산경영론집
• /
• 제31권1호
• /
• pp.1-12
• /
• 2000

The experience of many countries strongly suggests that bad governments and institutions have been a serious, if not the most serious, obstacle to economic growth and industry-structural adjustments. All public sectors pursue a mix of both predatory and productive activities-bad governments emphasizing the former, while good governments finding a way of promoting the later. In fishery public policy studies, much confusion exists about the roles of policy illustration and prescription. In general fishery public sectors involve collective actions by numerous individuals under conditions of uncertainty, complexity, bounded rationality, and imperfect information structure. All collective fisheries action organizations consist of a center(e.g., government), which leads fishery group actions, and peripheral participants(e.g., fishermen), which are controlled by the government. A paradigm is developed that gives both theoretical and empirical meaning to the constitutional determination of fisheries political preference function or fishery public sector governance structures. Three relevant spaces are specified: policy instrument, results, and constitutional. The collective-choice rules of the constitutional space structure the tradeoff between public and special fishery interest groups. Fishery public sectors seeking sustainable reductions in wasteful rent-seeking fishing activities should select constitutional principles and institutional structures that tend to promote resource sustainability. In particular, the effects of internal and external events on fisheries may result in a greater or lesser concentration of interest group power. Thus, the structure of the fishereis political power must be assessed in any prescriptive evaluation of alternative fishery governance weights.

• 수산해양기술연구
• /
• 제53권4호
• /
• pp.337-348
• /
• 2017

The tension of warp from trawler and sea-floor contact can generate tilt and wake turbulence around otter boards. Preliminary measurements of otter board tilt and 3-D flow velocity during bottom trawl operations were taken using a vector instrument to investigate the effects of wake turbulence at the trailing edge of the otter board. Tilt data (i.e., yaw, pitch, and roll) at 1 Hz and flow data (velocities in the towing, lateral, and vertical directions) at 16 Hz were analyzed to determine their periods and amplitudes using global wavelet and peak event analyses. The mean period (${\pm}standard$ deviation) of the tilt from the peak event analysis ($5{\pm}2s$) was longer or double than that of flow velocity ($3{\pm}2s$). The two periods also had a significant linear relationship. The turbulence rate of flow was 30-50% at the trailing edge and was closely related to roll deviation. The frequency of phase difference ratios (i.e., peak time differences between tilts and flow periods) was significantly different from random occurrence in two trials, possibly due to side tidal effects. However, in the other trials, flow peaks were random, as shown by the even peak times between tilts and flows. Future studies should focus on reducing tilt variation, wake turbulence, and bottom contact to stabilize otter board motion.