안강망어선(鮟鱇網漁船)에 대하여

정공흔 한국과학사학회 1979 한국과학사학회지 Vol.1 No.1

濟州島 周邊의 筏船調査

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.

대형 쌍끌이 기선저인망어선의 예망력에 대하여

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.

鮟鱇網漁船의 船形에 對한 史的 考察

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.

環境條件이 고등어 전갱이 魚群의 分布에 미치는 影響

盧洪吉,鄭公炘 제주대학교 1978 논문집 Vol.10 No.-

In spring 1971, the Mackerel and Jack Mackerel fishing grounds of the western region of Goto Islands and the eastern region of Tsushima, Japan formed in the edge of eddy and water pocket and the distributed type of these fish shoals, that appeared straight line in most case, was a tendency to from parallel with streamline. Therefore, there is necessary to study about current in these fishing grounds in order to presume the distributed state and the transferred direction of these fish shoals.

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.

鮟鱇網漁業에 依한 참조기 漁獲과 月令에 對하여

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.

濟州島 沿岸의 水溫 鹽分 變動에 관한 硏究-Ⅱ : 地域的인 變動 特性 The Characteristics of Local Fluctuation

盧洪吉,鄭公炘 제주대학교 1977 논문집 Vol.9 No.-

In order to get knowledges about the characteristics of local fluctuation of temperature and salinity in the coast of Jeju Island, the authors carried out oceanographic observation at the shore stations located around Jeju Island from 1976 to 1977. The results analyzed the data to get by the oceanographic observation are summarezed as follows; 1. The North coast of Jeju Island accept the influence of offshore water during a knger period through a whole year than the south coast of Jeju Island. The East coast of Jeju Island accept the influence of the Tsushima Warm Current and the West coast of Jeju Island accept the influ- ence of the Yellow Sea Warm Current. 2. The sea area where temperature and salimity is the most changeable in the coast of Jeju Isl- and is the coast of Pyosen and the coast of Gimnyeong is the most coastal water in the North coast of Jeju Island.

濟州島 沿岸의 環境特性에 關한 基礎的 硏究-Ⅰ : 西晷浦 沿岸水의 擴張範圍 The Extension of the Coastal Water off the Seogwipo

盧洪吉,鄭公炘 濟州大學 海洋資源硏究所 1980 해양과환경연구소 연구논문집 Vol.4 No.-

西歸浦 앞바다에 流入되는 陸水는 2m未滿의 얇은 版狀으로 海水위를 덮고 있고, 이 陸水때문에 만들어지는 沿岸水는 鳥島와 蚊島의 中間에서 森島를 잇는 線까지 擴張하여 이곳에서 外海水와 현저한 潮境을 만들며 이 潮境의 外海쪽에는 過流가 자주 나타난다. 이와같이 海況이 西歸浦 앞바다에 많은 回游性 魚類를 集合시키는 原因이 되는 것 같다. The freshwater being inflow in the sea off the Seogwipo diffuse above seawater with thin layer less than two meters and the coastal water off the Seogwipo formed by influence of freshwater is extented to the line connected between Sam Do and the middle point between Mun Do and Jo Do. Accordingly, the sharp discontinuous line of salinity appear in the out side edge of the coastal water and eddy current, frequently occur in offshore of Seogwipo that is out side of the discontinuous line. Many pelagic fish seem to aggregate in this area bacause of these oceanic conditions.

濟州道 沿岸의 水溫 鹽分 變動에 關한 硏究-Ⅰ : 一般的인 變動의 傾向 The tendency of the general fluctuation of temperature and salinity

盧洪吉,鄭公炘 제주대학교 1976 논문집 Vol.8 No.-

The tendency of the general fluctuation of coastal sea surface temperature and salinity in Jeju Island is investigated to get knowledges about the characteristics of the surrounding waters of Jeju Island. The reaults obtained are as follows; 1. The coastal surface water of Jeju Island is covered by Tsushima Warm Water mass through a whole year but the phenomenon of low temperature appear occasionally due to the extension of the Yellow Sea cold water, the occurrence of wind wave and the development of upwelling. 2. The mean minimum temperature which occurs from the late in February to the middle in March is 12.5℃ at the shore sation of Sanji and 14℃ at the shore sation of Seogwipo. The mean miximum temperature which occurs in August is 25℃ at the shore station of Sanji and 27℃ at the shore station of Mara-Do. The irregular variations of the coastal sea surface temperature appear before and after the occurrence time of mean maximum tempenature. However, the most stable season of the coastal sea surface temperature is the spring. 3. Analyzing the varied aspect of the surface water temperature at Sanji and U-Do, it suggests that anticyclonic current may occure in the channel of Jeju in summer. 4. Mara-Do and U-Do are the important shore sation that the former can use to study about the extension of the Yellow Sea cold water and that the latter can use to study about the variation of the strength of the Tsushima Warm Current. 5. The occurrence time of the maximum air and water temperature coincides well because the variation of air temperature influence directly the variation of water temperature at the same time or less than ten days. 6. The minimum salinity at the each shore station in Jeju Island is the range of 27.30-29.00 0/00and it occurs from the late in August to the early in September because of the difference with location. 7. The variation of salinity in the coast of Jeju Island coincides well with the variation of the precipitation in Jeju Island and particularly, the phenomenon which of salinity deerease rapidly in summer is principally caused by the decrease of salinity in the off shore of Jeju and inflow of great quantity of land water from Jeju Island. 8. One of the characteristics of the coastal sea condition of Jeju Island is the rapid fluctuation of temperature and salinity in summer.