본 연구에서는, NACA 익형의 받음각의 변화에 따른 영향을 파악하기 위한 연구로서, 수직축 다리우스 풍력발전기를 만들기 위한 기본적 형상을 이용하였다. 특히 수치해석에 있어 근접벽면 모델링에서 y+값이 1에 가까울수록 수치결과값이 정확해진다고 알려져 있다. 따라서 본 연구에서는, y+값의 변화를 통하여 최적의 y+값을 찾는 것을 목표로 하고 있다. 본 연구에서 사용한 레이놀즈 수는 360,000로 익형길이, 입구 유속은 각각 0.12m, 43.8m/s으로 설정하였다. 수치해석결과 익형의 양력계수는 받음각이 증가함에 따라 증가하는 경향을 보이며, 실속각 이후에 급격히 감소하는 것을 확인하였으며 양력계수는 받음각이 0o~10o까지 증가하였고 이후, y+값에 따라 다르지만 대략 10°~16°에서 급격히 떨어졌다. 본 논문에서 실험결과에 근거하여 수치해석에 y+값이 1에 가까운 것이 적절하다고 판단된다. 표면 압력 분포에서 최대값과 최소값 C/Cm은 1.89, 그리고 최대값의 변화는 받음각의 증가에 따라 앞쪽, 혹은 뒤쪽으로 이동 되었다.

For an effective management of fisheries resources, it is very important that to make clean inhabitation environment and to preserve fisheries resources. The material which is mainly used as fishing gear in modern times, is polyethylene, polypropylene, polyamide, etc., chemical fiber. And lost fishing gears which are make of these, occur ghost fishing and ocean pollution. To solve these problem, we development biodegradable fishing trap using the polybutylene succinate (PBS). Developed traps are for red snow crab (Chionoecetes japonicus) and shrimp, major traps in the East Sea, and we carried out fishing research using two kind traps in the coastal sea of Ayajin-port (Goseong) to analysis fishing efficiency of PE trap and PBS trap. As a result for fishing experiment (year 2005-2006) of red snow crab trap, two kind traps were almost the same in catches and length composition. During a experiment, parts of meshes, used for over 1 year, were cut by biodegradation. As a result for fishing experiment (year 2007) of shrimp trap, northern shrimp (Pandalus eous), coonstripe shrimp (Pandalus hypsinotus) and morotoge shrimp (Pandalopsis japonica) were catched, and the almost is northern shrimp. Two kind traps were almost the same in catches and length composition. In accordance with these result, it is recommended that the developed traps are have to commercialized because the fishing powers of PE traps and PBS traps were same. But biodegradation speed is have to controled in consideration of ocean microorganism volume and traps life.

For an effective management of fisheries resources, we need fisheries informations necessary for the establishment of reasonable fishing effort and TAC distribution. We carried out fishing research using trammel nets in the coastal sea of Susan-port(Yangyang, Gangwondo, Korea) and Hupo-port(Uljin, Gyeongbukdo, Korea) and analyzed fishing power variation of the fishing gear in terms of species composition, condition and so on for both sites. A total of 29 species were caught with most dominant species of Hippoglossoides dubius followed by Pseudopleuronectes herzensteini, Lophius litulon and Alcichthys elongatus in Susan. The total number of species caught in Hupo was 37 species with most dominant species of Todarodes pacifius followed by Lophius litulon, Hexagrammos agrammus and Pseudopleuronectes herzensteini. CPUE of Susan fishing area per trammel net was 12.74 fish and 2.00kg on average, while it was 6.80 fish and 2.27kg on average for Hupo. The fishing power index for both sites was 1, placing the two fishing grounds in a same level.

The fishing lamp is a fishing gear that gathers fish at night. But the cost of oil, which is used to light fishing lamp, has been risen significantly up to 30-40% of total fishing costs. Therefore it is very urgent to develop an energy economical fishing lamp in order to solve the business difficulties of fisheries. Under this background, this research aims at developing a fishing lamp for squid jigging and hairtail angling fishery using the LED, which has excellent energy efficiency and durability. The LED fishing lamp developed can be controlled to fix a fit direction of fish shoal deep because a fishing lamp can be adjustable up and down directions. One unit of fishing lamp has about an 80Watt capacity and the frame of fishing lamp is made of aluminium to emit generated heat of LED to outside. The LED lamp developed was highly durable, only 5.7% of emitting efficiency decreased for 18 months. The illuminance of a unit LED lamp was 2,070lux at 1m and 21lux at 10 m distance, and the intensity of LED lamp system emitted 2,580lux and 400lux at the respective distances. After development of this fishing lamp, 100 units are installed on operating fishing vessels. Experimental results show that energy consumption of squid jigging and hairtail angling was reduced by 40% and 87%, respectively. In conclusion, our methods showed elevated fishing power, compared with traditional fishing method: 37.7% for squid jigging and 24.5% for hairtail angling.

Squid jigging fishery is very important in that there are about 1,000 jigging vessels more than 10 tonnage and about 5,000 ones less than 10 tonnage in Korea. But the cost of oil which is used to light fishing lamps, goes significantly up to almost one hundred million won for 50 tonnage vessels and forty million won in case of vessels less than 10 tonnage. This cost has almost taken 40% of total fishing costs. That is, the fishing business condition of squid jigging fishery is recently in the very difficult situation. As oil price increases, the business condition of the fishery gets worse and worse. Therefore it is very urgent to develop an economical fishing lamp, to solve this problem of fishery's business difficulty. This research aims at developing a fishing lamp for squid jigging fishery using the light emitting diode which has very excellent efficiency and durability. We made a water tank with 20 meters width which is a shape of raceway to research behavioral characteristics of Japanese flying squid to LED light, and made an experiment to investigate optimum wave of LED light to lure squid. The method is to establish LED lamps on both ends of water tank and to observe squid's behavior. Colors and wave lengths of LED lamps, used in experiment, are red(634nm), yellow(596nm), green(523nm), blue(454nm) and white(454nm+560nm). In experiment for attractive capability of LED lamp to squids, Japanese flying squid are highly attracted to blue lamp and white lamp. However, they are dispersed to red and yellow lamps. In addition, Japanese flying squid have moved and stayed in both dark ends of water tank. When compared intermittent lamp with continuous lamp, Japanese flying squid are highly attracted to intermittent lamp when intermittent interval is 0.25 second.

This study aims to reduce the bycatch of young fishes and other species in the octopus(Octopus vulagris, Octopus dolfleini) trap fishery on the East Sea, Korea. We carried out field experiments and tank experiments to verify the fishing efficiency and bycatch with the different 8 types of trap. 4 of them had mesh size 20, 35, 55 respectively and 75mm, 2 of them with escape ring of diameter 30mm and 50mm and 2 of them with escape device. The gap was 20 and 40mm respectively. The mesh sizes of the traps with ring and frame were 20mm. The traps with mesh size 20 and 35mm were not reasonable because it could fish under 300g octopus as bycatch which is not permitted by the Korean fisheries regulations. The catch number of octopus over 300g by traps with escape ring of diameter 30mm was 53. The catch of trap with mesh size 20mm was 54. The catch of trap with mesh size 35mm was 53. There is no significant difference among them. The catch number of octopus over 500g that is fishermen's favorite one was 46 in the trap with escap ring. The diameter of was 30 mm and the catch of trap with mesh size 20mm was more 3 catch and the catch of trap with mesh size 35mm had 6 more catch. Fishermen wanted to catch over 500g octopus because the octopuses had commercial value. The traps with escape ring can be replaceable with he traps with mesh size 20 or 35mm because the trap is suitable to conserve the octopus resources and keep the fishermen's fishing substantiality.

The mesh selectivity of gill net for Japanese sandfish (Arctoscopus japonicus) caught in the East Sea, Korea was described. The experiment was conducted with five different kinds of mesh size (39.4, 45.5, 51.5, 53.0, 57.6mm) between November and December 2006 in spawning season. The catch was mostly Japanese sandfish (93.3%) and some others (6.7%), and almost all of the female Japanese sandfish were larger than the fork length at 50% maturity (16.7cm). The selection curve for the female Japanese sandfish caught from the experiments was fitted by the Kitahara's method to a polynomial equation which was s(R)=exp{(0.2584R3-5.3445R2+32.269R-59.868)-0.6585} where R＝l/m, and l and m are fork length and mesh size, respectively.

The investigation for the species composition and catch in the deep East Sea was carried out with commercial trawlers from 2004 to 2006. The catches were 6,043kg and were composed of 43 species with 34 hauls between 250m and 1,030m in depth. The principal species caught were Allolepis hollandi, red crab (Chionoecetes japonicus), Careproctus rastrinus, Argis lar, Chionoecetes opilio, Malacocottus gibber, Petroschmidtia toyamensis, Pandalus eous Makarov, and Dasycottus setiger. The rate of discarded catches in situ was about 50%. The diversity indexes of 2005 and 2006 were 1.152 and 0.878, respectively, and the evenness indexes at those years were 0.752 and 0.583, respectively, which implied one dominant species caught in 2006.

This research aims at establishing the application of canvas kite to the fishing gear through the analysis of the lift/drag tests of the kites have been performed in our previous finding. Now that several methodologies were designed to find the most effective triangular model as a buoyancy device applied to the fishing gear. Comparisons of drag/lift were made by installing the model in an installation frame instead of the prototype. Also, we have considered the application of canvas kite to the prototypic fishing gear by calculation using the result of this test. The results obtained from the above approaches are summarized as follows, where attack angle, lift coefficient, maximum lift coefficient and drag coefficient are denoted as B, CL, CLmax and CD respectively. The camber showed a gradual increase with an increase of fluid velocity. There was a big discrepancy in B=20 unlike B=30. Even if the kite retreats along the fluid flow, there is little relationship with the velocity variation. Lifts calculated with the kites were bigger and drags were smaller than those of the calculations with the float only. The kite as the buoyancy device will be very useful when the appropriate applications and the stability are met.

This research aims at establishing the fundamental characteristics of the kite through the analysis of the flow field around various types of kites. The approach of this study were adopted for the analysis; visualization by CFD(computational fluid dynamics). Also, the lift/drag and PIV(particle image velocimetry) tests of kites had been performed in our previous finding. For this situation, models of canvas kite were designed by solidworks(design program) for the CFD test using the same conditions as in the lift/drag tests. And we utilized FloWorks as a CFD analysis program. The results obtained from the above approach are summarized as follows: According to comparison of the measured and analyzed results from mechanical tests, PIV and CFD test, the results of all test were similar. The numerical results of lift-coefficient and drag-coefficient were 5-20% less than those of the tests when attack angle is 10˚, 20˚ and 30˚. In particular, it showed the 20% discrepancy at 40˚. The numerical results of the ratio of drag and lift were 8-13% less than those of the tests at 10˚ and 10% less than those of the tests at 20˚, 30˚ and 40˚. Pressure distribution gradually became stable at 10˚. In particular, the rectangular and triangular types had the centre of the high pressure field towards the leading edge and the inverted triangular type had it towards the trailing edge. The increase of the attack angle resulted in the eddy in order of the rectangular, triangular and inverted triangular type. The magnitude of the eddy followed the same order. The effect of edge-eddy was biggest in the triangular type followed by the rectangular and then the inverted triangular type. The action point of dynamic pressure as a function of the attack angle was close to the rear area of the model with the small attack angle, and with large attack angle, the action point was close to the front part of the model.

The mesh selectivity of drum net traps for Buccinum opisoplectum Dall caught in the eastern sea of Korea was described. Several experiments were conducted between July 2003 and March 2004 and the data obtained from the experiment was fitted by SELECT (Share Each Length class's Catch Total) model with unequal fishing and sampling efforts. The selection curve was determined to be 'estimated fishing efficiency' by model deviance rather than AIC. However the fishing efficiency between 20mm and 35mm mesh size did not seem to be different. The L50 lengths of the selectivity for the 55mm and 75mm mesh size were 65.4mm and 96.0mm, respectively.

동해안의 연안성 어족인 빨간횟대에 대해 망목크기 등을 달리한 8종류의 장구형 통발을 사용하여, 2003년 6월부터 12월까지 총 6차례에 걸쳐 어선 2척을 용선하여 조업한 어획실험으로부터 망목선택성 곡선을 구하여 합리적인 자원관리에 대한 기초 자료를 구하고자 하였다. 망목 크기가 20mm와 35mm인 두 통발의 빨간횟대 어획물로부터 체장에 따른 어획비율의 차이에 대해 특별한 경향을 발견할 수 없었다. 망목 크기가 20mm와 55mm인 두 통발의 경우에 대해 SELECT방법을 이용하여 equal split model 과 estimated split model을 적용한 결과, AIC 값이 적은 전자가 더 적절한 모델이므로, 빨간횟대의 경우는 이들 두 통발에 대한 입망률의 차이는 없는 것으로 나타났다. 망목 55mm의 통발에서 SELECT 모델로 구한 50% 어획될 빨간횟대의 전장은 22.0cm였다. 망목 크기가 20mm, 35mm, 55mm인 통발의 어획 자료에 Kitahara의 방법으로 logistic식을 적용하여 추정된 선택성 곡선식은 와 같았고, 현재 규정 망목 크기인 35mm 장구형 통발에 대해 50% 어획될 빨간횟대의 전장은 21.4cm이었다.

끌그물로부터 탈출한 소형어류의 생존율을 향상시킬 수 있는 자원관리형 어구어법을 개발하기 위한 기초 조사로서, 트롤망에서 양망 후 투기되는 어류의 생존율을 조사하기 위한 시험조업이 한국 남해안 및 제주도 근해에서 이루어졌다. 트롤망의 끝자루를 탈출한 소형어류를 선내에 비치된 사육수조에 수용하여 시간대별로 생존지속 시간을 조사하였다. 그 결과를 요약하면 다음과 같다. 1. 트롤 어구로부터 어획된 어류를 선상에 비치된 사육수조에 넣어 생존율을 조사한 결과 살오징어, 한치, 갈치, 달고기, 삼치, 참조기 및 눈볼대등 대부분의 어종은 양망후 즉시 사망하였다. 2 두툽상어, 붕장, 가오리, 말쥐치, 부채새우 등은 수조내에서 장시간 생존하였으므로 이들 어종은 투기된 후에 생존할 확률이 높을 것으로 생각된다. 3. 탈출장치를 빠져나온 등가시치는 수조에 수용된지 6 시간 이내에 전부 사망하였으나,97% 의 두툽상어와 72% 의 붕장어는 72시간 이상 생존하였다. 4. 끝자루를 빠져나온 가오리는 수조에 수용된지 60시간 이내에 모두 사망하였으나, 25% 의 말쥐치와 문어는 72시간 이상 생존하였다. 5. 홍감팽의 경우 탈출장치와 끝자루를 빠져나온 개체간의 생존율을 비교해보면, 끝자루를 빠져나온 홍감팽은 72 시간 이내에 전부 사망하였으나, 탈출장치를 빠져나온 것의 8.3%는 72시간 이상 생존하는 것을 보여줌으로서, 탈출장치를 빠져나온 개체의 생존율이 다소 높은 것을 보여주었다. 6. 그러나 부채새우의 경우를 비교해 보면, 끝자루를 탈출한 새우의 생존율이 75%로서 탈출장치를 빠져나온 부채새우의 생존율 33% 보다 훨씬 높게 나타났다. 따라서, 탈출후의 어종별 생존 특성에 대해서 보다 많은 연구가 필요할 것으로 본다.구면적은 유속이 증가함에 따라 지수함수적으로 감소하는 경향을 보였으며, 망구면적의 감소율은 기준형보다 무부자망이 더 작게 나타났다. 여과량은 유속이 증가함에 따라 로그함수적인 경향을 보였으며 기준형이 3.0knot 이상에서 급격히 감소하였지만, 무부자망은 4.0knot까지 증가하였다가 완만하게 감소하였다. 5. dL의 최대적정길이는 망구면적 및 여과량이 최대인 30m일 때이며, 추의 최적위치는 4개의 그물목줄이 연결되는 지점이었다.times〈/TEX〉101 CFU/mL로 감소되었으며, 48시간 배양하였을 때에는 생육이 완전히 억제되었다. 그리고 1.24×105 CFU/mL 수준의 Sta. aureus를 접종한 경우 24시간 배양 후 아주 미약한 생존 균수의 감소를 보였으나 48시간 배양시 4.00×102∼8.50×102 CFU/mL 수준으로 감소하였고, Sal. enteritidis를 1.81×105 CFU/mL 수준으로 접종한 경우 24시간 배양 후부터 전연 증식을 나타내지 않았다. 이와 같이 오미자 물 추출액 첨가에 의해 drink yoghurt 내에서 식중독 유발균들의 증균 억제 효과를 확인할 수 있었다.할 수 있었다.4.9% (1.39×104 cfu/mL)분포하고 있는 것으로 동정되었다.bamboo weir, the eddy out of the left wing was co