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中部 大西洋 참치 延繩漁業에 關한 硏究 : 鈞獲率과 氣象要因과의 關係
鄭公炘 군산대학교 1968 群山水産專門大學 硏究報告 Vol.2 No.1
This is a resesrching work with the relation between the hooking rate of Tuna 1.one Line and the meteorological factors upon the daily data collected aroud Central Atlantic Fishing ground from Nov. 12, 1965 through June 18, 1967. The followings were shown. 1.On terms of air temperature, the catch was most abundant at 25.6℃∼26.0℃, below the yearly average temperature. 2.With the weather, the cloudy weather was adquate to fishing and then the blue weather. 3.With the atmosphere pressure, the fishing was recommendable over 1016mb. 4.With the wind direction, the fishing was favourable in NW∼N∼NE.
정공흔 군산대학교 1969 群山水産專門大學 硏究報告 Vol.3 No.2
The net towing force of the larger bull trawler has been measured and the relative expression between Koyama's trawler shaft horse power(B.H.P) and pulling power(E.H.P.) was applied to the above larger bull one. The results obtained are as follows; 1.The number of k of A-trawler is 0.293, so is that of B-trawler. 2.The resistante(R) which was measured by means of the tension(T) and the horse power in a main engine has approximately the same number with that (Rn) of Koyama's calculation to a fishing gear.
鄭公炘 제주대학교 1983 논문집 Vol.15 No.-
濟州島 周邊에 散在하고 있는 筏船의 航海學的 考察을 위하여 基礎調査를 한 結果는 다음과 같다. 1. 濟州島 全沿岸에서 사용하고 있는 筏船은 51集이 있었으며 濟州道 東側의 北部와 南部에 많이 分布하고 있었다. 2. 構造는 韓國古來의 船舶의 底板의 構造와 그 構成이 恰似했으며 名稱도 同一한 것으로 미루어 筏船이 韓國古來의 船舶의 祖形일 수 있음을 推定할 수 있었다. 3. 積載能力은 길이 5m, 船首幅 1.7m , 船尾幅 2.1m, 船令 80年의 筏船의 浮力은 420kg이었으며 최대속력은 1.33kt이었다. The author investigated the fishing rafts in Quelpart Island in order to study the navigation of them and the results obtained were as follows; 1. The usable fishing rafts in the coast of Quelpart Island were found 51 ships. 2. There was a great resemblance between the structures of the fishing raft and bottom plate of ancient ship in Korea and the designations between them were found identity. Therefore, the author concluded that the type of the fishing raft was original type of ancient ship in Korea. 3. Buoyancy of the fishing raft, the length 5m, the width of the bow 1.7m, the width of the stern 2.1m, the 80 years of age, was 420kgs and maximum speed of her was 1.33 knots.
鄭公炘 제주대학교 1981 논문집 Vol.13 No.-
The form of stownetter in the early stages was not fixed, and they were in operation by means of the traditional wooden vessel in Korean or Japanese styles. When the West Coast of Korea was judged as a good fishery ground for stownetter operation, they made a type of the vessel that would be suitable for the tide, the depth of water the coastline, and their fishing implements in the Korean West Coast since around 1920. The proper structures of the vessel for the above conditions are the following : 1. The vessel must be wide in its width from the nature in the coastline, the depth of water, and their fishery ways. 2. The vessel needs much buoyancy to the fore-part of the vessel from the nature in the fishing implements and the tide. 3. The fore-part of the vessel must be high for the seaworthiness on sailing a boat. There are two types in these vessels. One of the vessel which is a spiky head gets buoyancy by lifting the fore-keel and the other type of vessels of being made board-built in its head gets buoyancy by heightening the outside of the upper deck. But these two types of the vessels had been disappeared with the appearance of iron-vessels in 1968. The high fore-part of the spiky head of vessel is not for sailing a boat or in operation, but the only figure of the fore-part of avessel.
鄭公炘,金龍翰 군산대학교 1968 群山水産專門大學 硏究報告 Vol.2 No.1
Along the western coast of Korea, the relations between the catch of Pseudosiaena manchurica using the improved stow net and moon's age are found as follows. 1). The difference between the catch of fore spring tide and that of after spring tide at spawning migration in spring, could not be discernible. 2). The catch in after spring tide, at migration to south in autumn, is expected to be more abundant than that in fore spring tide.
정공흔 한국항해항만학회 1986 한국항해학회지 Vol.10 No.2
For the purpose of estimation of navigational method and ability about fishing raft, we have practical navigation of her from Chujado on Oct, 7 to Maryang-ri , Kangjin-kun, Jeonranman-do on Oct.10. The results obtained are as follow : 1. Ancient navigation of her is thought to over to an isolated island in the vicinity with a good informations and experiences. 2. Speed of her in outward voyage is 1.34 knots, but is varied with structure and shape of her and ability of fishing raftman. 3. The lee way(U) of her with sail of hight 2.5m and breadth about 1.2m according to windspeed(W) is U=$0.038{\times}W$ 4. We could estimate to take only three days to go over from Chujado to Maryang-ri, Kangjin-kun. Jeonranam-do by her with sail, and make a voyage total 55 miles for thirty-four hours and ten minutes i, e, mean speed is 1.6knots resulty.