• Korean Journal of Fisheries and Aquatic Sciences
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• v.28 no.2
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• pp.194-201
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• 1995

In order to make clear the resistance of bag nets, the resistance R of bag nets with wall area S designed in pyramid shape was measured in a circulating water tank with control of flow velocity v and the coefficient k in $R=kSv^2$ was investigated. The coefficient k showed no change In the nets designed in regular pyramid shape when their mouths were attached alternately to the circular and square frames, because their shape in water became a circular cone in the circular frame and equal to the cone with the exception of the vicinity of frame in the square one. On the other hand, a net designed in right pyramid shape and then attached to a rectangular frame showed an elliptic cone with the exception of the vicinity of frame in water, but produced no significant difference in value of k in comparison with that making a circular cone in water. In the nets making a circular cone in water, k was higher in nets with larger d/l, ratio of diameter d to length I of bars, and decreased as the ratio S/S_m$ of S to the area $S_m$ of net mouth was increased or as the attack angle 9 of net to the water flow was decreased. But the value of ks15m was almost constant in the region of S/S_m=1-4$ or $\theta=15-90^{\circ}$ and in creased linearly in S/S_m>4 or in $\theta<15^{\circ}$ However, these variation of k could be summarized by the equation obtained in the previous paper. That is, the coefficient $k(kg\;\cdot\;sec^2/m^4)$ of bag nets was expressed as $$k=160R_e\;^{-01}(\frac{S_n}{S_m})^{1.2}\;(\frac{S_m}{S})^{1.6}$$ for the condition of $R_e<100$ and $$k=100(\frac{S_n}{S_m})^{1.2}\;(\frac{S_m}{S})^{1.6}$$ for $R_e\geq100$, where $S_n$ is their total area projected to the plane perpendicular to the water flow and $R_e$ the Reynolds' number on which the representative size was taken by the value of $\lambda$ defined as $$\lambda={\frac{\pi d^2}{21\;sin\;2\varphi}$$ where If is the angle between two adjacent bars, d the diameter of bars, and 21 the mesh size. Conclusively, it is clarified that the coefficient k obtained in the previous paper agrees with the experimental results for bag nets.

• Journal of Fisheries and Marine Sciences Education
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• v.15 no.2
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• pp.206-218
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• 2003

In spite of the importance of a fishing industry, neither any terminology defined in details nor academic systems to educate the workers in the fishery were established in the fisheries social education. The fisheries social education was considered to be the practical area around the actual fields. Therefore, on-site education was very important. Accordingly, this study collected and analyzed theoretical basis of a social education and data on the rural adult education and examined the actual status of the fishing industry in Korea and fisheries extension services enterprise and fisheries developmental enterprise corresponding to the actual fisheries social education conducted in Korea. On the basis of these frames, this study summarized the direction for the progress of fisheries social education that has not been studied until now for the purpose of suggesting the future directions of the fisheries social education as follows; The recognition on the importance of fisheries social education and fundamental researches in the fisheries social education should be extended. The practical development of fisheries social education should be realized. Fisheries extension services enterprise should be evolved by fishermen. The abilities of instructors in the fisheries social education should be improved. The academic factors in the fisheries social education should be emphasized. Inter-disciplinary and multi-disciplinary approaches should be adopted. Various programs should be developed for the progress of the fisheries social education. The exclusive department in charge of the fisheries social education should be established. The information system for the fisheries social education should be secured. The industry, academic organizations and the organs should make cooperation. The fisheries social education should be provided by general social education institutions for the progress. The fisheries development should be deployed on the basis of environmental preservation. It is necessary to deploy the new fishing village movement like the Saemaul movement to the fisheries. The administrative and financial supports for the fisheries social education should be expanded. It is essential to cultivate the future fishermen for the international competitiveness.

• The Journal of Fisheries Business Administration
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• v.31 no.1
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• pp.95-113
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• 2000

This paper aims to analyze the competitiveness of the Korean Deep-sea Fisheries firms in the firm level. The extant researches on this topic have been done mainly in the macro-or industry-level perspectives and depended on the quantitative analyses using the aggregated data. The results of these researches are useful to figure out the main features of the industy, however, hardly give any implications on the strategic or competitiveness-related problems in the firm level. To accomplish the research purposes this study analyzes the competitiveness of the Korean Fisheries firms on the value chain scheme using qualitative tools. Specifically this paper focuses on the industry competition characteristics, key success factors, the competitiveness, and the supporting systems and policies of the Korean Government. Data are gathered by questionaire and analyzed by factor analysis and Kruska-Wallis one-way ANOVA. The results shows that the competitiveness of the Korean Deep-sea Fisheries firms is not behind the foreign competitors. However the resource securing, the market development, R&D investment are the main obstacles to the firms. The governmental supports are kedined to improve the competitiveness of the Korean Deep-sea Fisheries firms.

• Journal of Fisheries and Marine Sciences Education
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• v.16 no.1
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• pp.1-10
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• 2004

The department of education developed editing data of fisheries and shipping high school subject in 1987. But as change to informational society, the new term and predicate were built on a textbook of fisheries and shipping that was not in the past. Terms came into being in this way, it was used indiscreetly by spending a different expression on a textbook. In this study based on currently subject of fisheries and shipping high school 36books, examined an elementary school junior high school and a definition related term in order to solve these problems. Specialist on each field selected term and the predicate which is objective and proper. Especially field of fisheries and shipping uses a japanese term as it is. So there are a lot of the terms that is hard for students. Using these terms yet, the term that meaning delivery is uncertain and hard expression is going to carry out role to convert to a clear and easy term through this study.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.31 no.4
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• pp.553-559
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• 1998

Electron micrographs of muscle of plaice killed instantly by spiking at the head clearly showed the A-band, I-band, Z-line and M-line in muscle strips, whereas these bands could not be distinguished from each other in electrically stimulated plaice muscle strips. As the electrical stimulation time increased, the continuity of Z-line disrupted rapidly. Electron microscopic observation showed that sarcoplasmic reticulum (SR) in unstimulated plaice had natural triad structures between Z-line. However these structures were disrupted in the electrically stimulated sample. These structures were clearly observed after storage for 10 hrs at $5^{\circ}C$ from all the samples. In association with the $Ca^{2+}$ translocation, $Ca^{2+}$-pyroantimonate deposits were observed at the inner part of SR immediately after spiked the plaice, However, $Ca^{2+}$-pyroantimonate deposits in electrically stimulated plaices were observed in the muscle strips and this phenomenon was clearly observed when electrical stimulation was prolonged.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.23 no.4
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• pp.157-162
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• 1987

The basic experiments on the plastic sea eel pots used in fishing were carried out in order to investigate the elasticity of the funnel ribs, hydrodynamic resistance, sinking time and diffusion of the bait from June to October, 1987. The elasticity of the bamboo funnel ribs was higher than that of the polypropylene ribs up to the load 150g. The hydrodynamic resistance R (kg) of the pots towing to the head direction horizontally in relation to towing velocity V (m/sec) was expressed as following formula; R=0.36V super(2.01) and coefficient of drag C sub(D) was 0.52. The sinking times of the covered pots by tape fully or partially were late 1-2 second than the typical pots within the water depth 7.5m. The diffusion tendency through the covered pots using dye and sardine extracts solution was concentrated to the entrance more than the typical pots. However, fishing efficiency as number and weight of fish per pots for nine times fishing operation was revealed no difference between the covered pots and the typical pots.

• Journal of Fisheries and Marine Sciences Education
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• v.17 no.2
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• pp.193-208
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• 2005

The object of this study is to provide a framework of increasing the effectiveness of the R&D planning of experts in fisheries and the education of students with the theoretical background and analytical skills through the adoption of technology roadmapping process in the marine production industry. The study was conducted by fact-finding surveys and the response content for surveys obtained from each expert advisor in the field of fisheries and maritime affairs such as fishery industries, some government organizations and research institutes including the Ministry of Maritime Affairs and Fisheries (MOMAF), National Fisheries Research and Development Institute (NFRDI) and fisheries-related universities was analyzed. The major implementation tasks to effectively achieve the basic goals of technology roadmap for short and middle-term research and development in the fisheries production field are as follows: 1. Research in order to achieve the realization of community-based resource management fisheries or fishermen-oriented co-management fisheries with paradigm shift in fisheries management. 2. Research in order to derive the construction of cost reducing and manpower saving systems in fishery-related science, technology and engineering. 3. Research in order to create the high value-added fisheries products with a focus on the upgrading of processing, freezing and refrigerating facilities, the reduction of logistics costs and the minimization of distribution steps. 4. Research in order to achieve the realization and development of environmental-friendly fisheries and internationally competitive fisheries through restructuring the entire fishing industries, in particular, small-scale fisheries. 5. Research in order to achieve the effective utilization of fisheries resources with a new creation of clean and living marine environment by fisherman under the balanced management and protection of marine living resources and fishing grounds.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.17 no.1
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• pp.1-8
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• 1984

The author carried out an experiment to determine the resistance of trawl net aboard M/S Saebada, training ship of National Fisheries University of Pusan, 2,275 G/T and 3,600ps. Total tension loaded on warp were measured by the recording tension meter. Resistance of the net is estimated by subtracting the resistance of otter boards and warps from the total tension. Coefficient k and exponent n of the formula on the trawl net deduced by Koyama, $R_N=k\frac{d}{l}abv^n$ were calculated from the resistance of the net obtained. The results obtained are can be summarized as follows : 1. Six seamed net with two net pendant k=11, n=1.8 2. Eight seamed net with three net pendant k=11, n=1.8 3. Ten seamed net with three net pendant k=9, n=1.9 4. Ten seamed net with four net pendant k=9, n=1.9

• Journal of Navigation and Port Research
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• v.32 no.9
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• pp.699-703
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• 2008

Fiber reinforced plastics (FRP) have been widely used because of their high specific strength, high specific stiffness and etc. Although these kinds of FRP have various merits in applications, it has been had one of the complicated problems to manufacture their wooden mold. For these reasons, the simple methods to manufacture the mold required in the FRP industries. To improve these kinds of problems, the molding system using composite materials was developed. By this new manufacturing techniques and high functional FRP composite mold was built. Comparing with wooden mold, the process efficiencies of frame manufacturing process and inner mold manufacturing process were improved approximately 40% and 70%, respectively.

• Ocean and Polar Research
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• v.31 no.4
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• pp.305-318
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• 2009

A marine ranching project in Tongyoung was established in 1998, lasting 9 years to 2006. Project activities included the deployment of artificial reefs, the release of young fishes like jacopever and rockfish, and input/output control for specific marine ranching areas in Tongyoung. This report focuses on the economic feasibility of the project in hindsight. Analysis concentrates on three aspects; (a) direct economic benefits, such as increasing effects of fisheries income and savings in harvesting costs, (b) indirect benefits, including increasing effects of recreational fishing and saving R&D costs, and (c) costs, including releasing and purchasing costs of artificial reef and juvenile fish, R&D costs, maintenance costs and harvesting costs. Results show that NPV=4.7 billion won, IRR=8.55% and B/C ratio=1.286 under Scenario 1, which considers the saving effects of R&D costs, and NPV=0.9 billion won, IRR=6.03% and B/C ratio=1.11 under Scenario 2, which does not consider the saving effects of R&D costs, based on 5.5% of the social rate of discount. According to sensitivity analysis, the economic feasibility is very sensitive to the recapture rate.