This study investigated the drag coefficient and lift coefficient of thirteen kinds of knotless nettings used for large purse seine gear. By comparing the hydrodynamic characteristics with nets of the previous study, the characteristics of this study were derived as a purse seine gear. Thirteen kinds of nettings with different length of bar () and diameter () were used in the experiment, out of which six kinds used the 30 mm in mesh size and three kinds with 40 mm. The drag coefficient ( ) also increased with increasing . It can be expressed as        at a current speed 0.4 m/s and        at a current speed 0.5 m/s. Compared with previous studies, drag coefficient values were similar to knotless net of similar  and smaller than drag coefficient of knot net. Therefore, using knotless net in a purse seine has the advantage of reducing the resistance acting on the purse seine gear.

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 in fishing operation is generally related to hydrodynamic resistance on the gear. This research is to propose a low drag generated midwater trawl in terms of the gear design improvement using simulations. The results from the simulation were verified with results that mirrored the model experiments. From the results, the resistance force of the proposed gear decreased to 29% compared to that of the current gear. Furthermore, the gear performance also improved with increased gear mouth compared to the current one. Therefore, the proposed gear will be helpful to reduce the greenhouse gases from fishing operation. It will also contribute to the fishing industry by saving fuel.

오탁방지막이 바닷물 속에 설치되어 있을 때 조류와 파도가 변할 때 움직임과 앵커 파주력을 초과하는 유체력이 작용할 경우의 이동 메카니즘을 질량-스프링법으로 해석하였다. 설치 위치는 전남 진도군 임회면 굴포리 동령개 포구 해역이다. 앵커의 파주력을 초과하는 장력은 0.05 m/s에서는 318초 후에 도달하였고, 0.15 m/s에서는 77초, 0.25 m/s에서는 43초, 0.3 m/s에서는 37초 후에 앵커가 움직이기 시작하여, 조류 속도가 0.01 m/s로 증가함에 따라서 평균 11.2 초 정도, 앵커 이동시작 시간이 단축되고 있었다. 조류만 작용할 때와 파랑이 추가될 때의 차이점은 유속이 느릴 경우, 앵커의 이동이 시작되는 시간의 차이가 7.6 % 정도 발생하였으나, 유속이 빠른 경우는 4.3 %미만으로 큰 차이가 없이 앵커 이동이 시작되는 것을 알 수 있었다. 조류 속도가 0.13 m/s를 초과하고 파도의 방향이 일치하면 주변의 해저 구조물과의 충돌로 인해 오탁방지막 성능이 정상적으로 작동하지 않을 수 있으니, 오탁방지막을 바다에 설치할 때 해수의 흐름 상황 등을 질량-스프링 방법으로 면밀하게 검토해야 한다.

The WCPFC CMMs related to tropical tunas have been strongly restricting fishing capacity and operating activities of main fisheries, especially purse seine fishery. In terms of changes in fishing trend by implementing relevant measures of FAD set, the number of FAD set by Korean purse seine fleet showed a decreasing pattern with the lowest level of FAD set proportion among major distant water fishing nations. With regards to the FAD closure, there was no significant change in fishing effort but a drop in catch, especially bigeye tuna during the period of FAD closure. Moreover, it showed closely similar trends between the number of FAD set and bigeye tuna catch. In terms of measures related to the high sea area including a ban on fishing on the HSP and limitation of fishing days on the high sea by flag state, proportions of catch and effort on the high sea had sharply declined after implementing those measures. As relevant measures are expected to be strengthened, it should pay attention to change of coastal nations policies and focus on improving fishing efficiency of unassociated school set with multi-pronged efforts.

Fishing characteristics of Korean tuna purse seine fishery in the Pacific Ocean were investigated using logbook data compiled from captain onboard and the statistical data from 1980 to 2014. Changes in fishing ground and correlation between marine environmental factors and fishing patterns were investigated using Oceanographic index. The proportion of unassociated set was higher than that of associated set. The catch proportion of yellowfin was higher in the unassociated set, while that of skipjack and bigeye was higher in the associated set. Due to vessels, fishing gears and Korean captains’ high-level of skills in fishing technology optimized for the unassociated set and preference of large fishes, especially large yellowfin tuna, it showed unique fishing characteristics focusing on the unassociated set. As for fishing distributions of Korean tuna purse seine fishery and impacts of oceanographic conditions on the fishery, the main fishing ground was concentrated on the area of 5°N~10°S, 140°E~180° through the decades. When stronger El-nino occurred, the range of fishing ground tended to expand and main fishing ground moved to the eastern part of western and central Pacific Ocean. During this season, yellowfin tuna had high CPUE and catch proportion of yellowfin tuna in the eastern part also increased. As for the proportion of fishing effort by set type, proportion of log associated set was high during El-nino season while that of FAD associated set was high during La-nina season.

1. 터키의 연구체계 농업식품축산부(Ministry of Food Agriculture and Livestock) 산하에 국가농업연구기관, 교육부 산하의 고등교육위원회, 총리직속의 과학기술연구협회 등 3개로 구성되어있다. 농업연구기관은 10개 중앙연구소, 10개의 지역연구소, 21개의 작목/훈련시험장, 3개의 작물보호시험장 그리고, 3개의 축산시험장이 있다. 2. 터키의 지도기관 현황 및 지도체계는 국가지도기관과 민간지도기관이 있다. 국가지도기관은 농촌지도는 81개 지방, 803개 지역, 수천개의 마을주재 지역지도관이 있다. 3. 지방 농업부서는 지역 농업지도기관을 지도하고, 지역 농업지도기관은 지역지도관을 지도한다. 지역지도관은 전문지도사, 지도업무, 마을 단위 농업기술자들을 위한 직무연수를 실시하고 지원한다. 4. 민간지도기관은 농업인협회, 협동업체, 자선업체, 수익지향 민간 마케팅회사, 수출업자, 개인컨설턴트, 대중매체, 대학들 있다. 5. 민간 지도기관은 전문 자문가를 고용하여, 농업인은 영농 과정에 문제점이 발생하면 자문가에 비용을 지불하고 농업관련 서비스를 제공받아 영농 애로점을 해결한다.

Nowadays, consumption of fisheries products is increasing. There are several factors, one of which is a quantitative development through aquaculture. Another factor is an increase qualitative consumption of fish which require that fish be supplied alive. This requires a lot of technical effort to transport the live fish that have low survival rate (c.f. tuna and mackerel) in coastal waters and in the open sea. To develop a towing cage for transporting the live fish, model test in a circulate water channel and simulation by computer tool were carried out. In order to spread vertically, floats were attached at the upper part of the cage, and iron chains attached at the lower part of the cage. For horizontal spreading, kites were attached on the cage. The tension and spreading performance of the cage were measured. The result shows that the tension and reduction ratio of inside volume of the cage were tended to increase with increased towing speeds. The suitable operation condition in towing cage was 1.0 m/s towing speeds with vertical spreading force 8.7 kN, horizontal spreading force 5.6 kN; in this case the reduction ratio of inside volume of the cage was estimated as 25%.

본 연구는 국토교통부 건축행정시스템에서 제공하는 '세움터' 자료를 활용하여 대구시 달서구의 녹화가능한 옥상면적을 분석하였다.달서구의 전체 건축물은 총 62,741개소이며, 건축물 옥상의 전체면적은 10.8㎢로 나타났다. 1980년 이후에 사용승인된 철근콘크리트 구조의 평지붕 건축물로 한정할 경우 옥상면적은 4.7㎢로 나타났으며, 여기에 녹화가능 옥상면적 비율을 적용하면 달서구 전체면적의 약 5%에 해당하는 3.2㎢의 면적에 옥상녹화가 가능하다는 결과를 얻을 수 있다. 이는 옥상녹화를 통해 토지매입비용 없이 근린생활권 근린공원 약 300여 개소 이상을 조성할 수 있음을 보여주는 의미 있는 결과라 하겠다. 건물유형별 옥상녹화 가용면적은 주거시설이 68%로 가장 높았으며, 판매시설, 교육시설, 공공시설, 업무시설, 의료시설이 그 뒤를 이었다. 이러한 결과는 옥상녹화 활성화를 위해 주거시설 건축물에 대한 옥상녹화지원의 확대가 필요함을 의미한다.

The main purpose of this study is to analyse economic feasibility of low-carbon-oriented gear for anchovy boat seine. The results of benefit/cost analysis showed that use of the low-carbon fishing gear is economically feasible. Considering the fuel saving and relatively low CO2 emission by reducing the resistance of gear, net present value by such type 1 gear improvement was estimated about -2,490 ~ -1,580 million won with the benefit-cost ratio 0.81~ 0.88. And net present value by such type 2 gear improvement was estimated about 6,540 ~ 7,780 million won with the benefit-cost ratio 1.79 ~ 1.94. Development of lowcarbon trawl gear would render significant contributions to reducing CO2 emission in fishing operations and lead to reduce fishing costs due to fuel savings.

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.

본 연구는 다른 유형의 공원녹지와 구별되는 수변공원의 특성을 파악하고 이에 적합한 공원관리 및 수변공원 활성화 방안을 모색하고자 함을 목적으로 대구광역시의 수변공원인 봉무공원과 수성유원지를 대상으로 공원 이용행태및 만족도 조사를 위한 설문조사를 실시하였으며 다음과 같은 결과를 도출하였다.첫째, 수변공원의 조성은 시민들의 공원이용을 활성화 시킬 수 있으며 공원 이용객들의 공원 이용만족도증대에 효과적이다.둘째, 도시 내 접근이 용이한 지역의 수변공간 개발을 통한 공원 조성이 필요하다.셋째, 수변공원 조성 시 휴게공간 및 산책로의 조성 및 관리에 중점을 두어야 할 것 이다.넷째, 수변공원 내 수공간을 활용한 다양한 휴식 ‧ 여가 공간의 개발이 필요하다.위의 결과와 같이 도시공간에서의 수변공간의 개발을 통하여 도시민들의 공원이용을 활성화 시킬 수 있을것으로 사료된다.

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 trawl 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.

Currently, environment-friendly and sustainable fisheries are one of the major issues among fisheries authorities. A variety of alternative management policies and projects are going on to enhance fisheries management systems and fishery resources such as a TAC management program and a VDS (Vessel Day Scheme) management scheme for distant water fishing nations in Western and Central Pacific Fisheries Commission (WCPFC) convention area. These kinds of efforts among fisheries management authorities are aimed at limiting fishing capacity or fishing power. In terms of fisheries management, Fishing capacity and fishing power have increased the importance of the impact on a fishery and level of the resources. Increased fishing capacity and fishing power have caused not only depletion of fisheries resource, but also additional fishing cost. therefore, there is a clear need for authorities to manage fishing capacity and fishing power. It is also help ensure the conservation and sustainability of the fishery resources. Because of lack of data, absolute fishing power is difficulty to measure. The notion of relative fishing power is frequently used. In this study, relative fishing power was assessed using Mastuda (1991) method for fishing power index. The raw data for assessment was based on fishermen's logbook data from sampled fishing vessels in coastal snow crab gillnet fishery. Data Envelopment Analysis (DEA) method was used to assess fishing capacity. DEA is a linear programming methodology to measure the efficiency of a set of entities called Decision-Making Units (DMUs). It was recommended by FAO for assessing capacity in fisheries.

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. 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. This research will helpful to reduce the CO2 emissions from fishing operations and lead to reduce fishing costs due to fuel savings.

The paper presents investigations on to which degree the sinking speed of longlines is influenced by type of bait, bait sinking orientations and anchor weights. The main aim of this study is to obtain further insight in the ocean current displacement phenomena in demersal longlining. The sinking speed is one of the main factors deciding the current displacement. In an ongoing project, sinking speed experiments with longlines with 6 kg and 10 kg anchor weights have been carried out in the Trondheim fjord. The longlines used in the first experiments were rigged without bait and hook. The results of these experiments with two different anchor weights have revealed only a slight difference in the sinking speed, except for the part near to the anchors, even though the sinking speed of longlines in general is supposed to be much influenced by the anchor weights. The reason for the obtained result is supposed to be that the experiments have been carried out at relative shallow waters. Further studies have included bait sinking experiments in the flume tank. The experiments showed that the drag coefficient of "fillet type (flat)" bait varied from 0.763 to 1.735, while it for "elliptic type" bait varied from 0.62 to 1.483. Other activities have included calculation of the sinking speed of longlines as a function of the established resistance coefficients of bait of various shape and size for commercial longlining. The calculated sinking speed of a longline with the fillet type bait was found to be 12.4 to 16.5% lower than for a longline without bait.

In this research, the submersible fish cage was designed to avoid structural and biological damage during harsh sea conditions. The submersible cage system consists of netting, mooring ropes, a floating collar, floats, sinkers and anchors. Whole elements of the cage were modeled on the mass-spring model. The computer simulations were carried out to investigate the dynamic behavior of the cage and to calculate mooring line tension subjected to tidal currents and waves. As expected, the tension values in the mooring line of the submerged position are 36% less compared to that of the surface cage under the same loading conditions. As the wave was used in combination with the current velocity of 1m/s, the average tensile load for the submerged cage showed 85% of the value for the floating cage. The simulation results provide an improved understanding of the behaviors of the structure and valuable information on the optimized design of the cage system exposed to open ocean environmental factors.