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DTMNs를 위한 방향성 정보와 최대 공동 이웃 노드에 기반한 효율적인 라우팅 프로토콜
서두옥,이동호 (사)디지털산업정보학회 2010 디지털산업정보학회논문지 Vol.6 No.1
DTNs (Delay Tolerant Networks) refer to the networks that can support data transmission in the extreme networking situations such as continuous delay and no connectivity between ends. DTMNs (Delay Tolerant Networks) are a specific range of DTNs, and its chief considerations in the process of message delivery in the routing protocol are the transmission delay,improvement of reliability, and reduction of network loading. This article proposes a new LCN (Largest Common Neighbor) routing algorism to improve Spray and Wait routing protocol that prevents the generation of unnecessary packets in a network by letting mobile nodes limit the number of copies of their messages to all nodes to L. Since higher L is distributed to nodes with directivity to the destination node and the maximum number of common neighbor nodes among the mobile nodes based on the directivity information of each node and the maximum number of common neighbor nodes, more efficient node transmission can be realized. In order to verify this proposed algorism, DTN simulator was designed by using ONE simulator. According to the result of this simulation, the suggested algorism can reduce average delay and unnecessary message generation.
서두옥,정용진 제주대학교 해양연구소 1981 해양자원연구소연구보고 Vol.5 No.-
The tidal current, wind drift current and wind waves in the coast of Jeju Island were computed in the basis of tide tables, Thoma's formular and Hidaka's formular by use of wind data which observed at Jeju and Seogwipo Meterological Observatory. Chart and tide tables of the Hydrographic Office utilized to the stability of the artifical fishreefs in the coast of Jeju Island. The fluid resistance per unit area and the wave force per unit volume of the artificial fishreefs were summarized as follows; ◁표 삽입▷(원문을 참조하세요)
정용진,서두옥 제주대학교 1992 논문집 Vol.35 No.-
A underwater speaker was made by driver unit of usual speaker using acryl boards, polyester resin and the castor oil, and it was used to analyze frequency characteristics for lower frequency audiable pure sound in a water tank. A pure sound of which the frequency was from 300Hz to 500Hz was good frequency characteristics in a water tak experiment. But a pure sound which it were from 100Hz to 250Hz and from 600Hz to 1,000Hz were bad frequency characteristics. This underwater speaker make good use of sound fishing method which a shoal of fish are gathered, when it is broadcasted a audiable sound in underwater. This method is applied hair tail hand line fishing, squid hand line fishing, chub mackerel and japanese horse mackerel purse seine fishing, anchovy scoop net fishing in the coast of Cheju Island.
朴正植,徐斗玉 濟州大學校 海洋資源硏究所 1982 해양과환경연구소 연구논문집 Vol.6 No.-
濟州島 近海의 表層에 來游하는 가다랭이, 방어, 잿방어, 부시리, 삼치등의 漁獲에 利用할 無端式 曳繩釣魚具와 回轉機器를 試作하여 小型 漁船에 裝置하고 試驗하여 良好한 結果를 얻었으며 그 結論은 아래와 같다. 1. 回轉機器는 船尾部와 船의 中央部 甲枚에 設置하여 無斷式 曳繩釣魚具를 曳引하면서 連續 回傳시킬 수 있었다. 2. A型 漁具는 機器의 驅動로라에 의해 22.8㎝/sec로 連續 回傳되면서 曳引되었다. 3. 船速을 3m/sec로 하고 A型 漁具를 曳引할 때의 張力은 15.7㎏였다. Skipjack (Katsuwonus pelamis), Yellow tail (Seriola quinqueradiate), Pudder fish (Seriola purpurascens). Jack (Seriola aureovittata) and Spanish mackerel (Scomberomorus niphonius) were caught mainly by trolling gear in the coastal water of Jeju Island. mainly by trolling gear in the coastal water of Jeju Island. As this conventional gear was improved the automatic trolling gear which composed of an endless trolling gear and a rotary equipment, it was manufactured and made an experiment in the sea. 1. The rotary equipment which was installed on the stern or the center deck of fishing boat could be revolved an endless trolling gear. 2. The endless trolling gear of type A was continually rotated with 22.8㎝/sec in revolving speed of main line by a rotary epuipment. 3. The hydrodynamic resistance of the automatic trolling gear was 15.7Kg when a fishing boat towed fishing gear of type A with a towing speed of 3m/sec. This automatic trolling gear has set on a fishing boat(G.T. : 8.1 ton, 45HP), the result was very satisfactory.
제주도 연안 갈치 채낚기 어구의 생력화 : 1.연속식 채낚기어구의 모형 실험
서두옥,정용진,김석종,이창헌,김고환,박용석 제주대학교 해양연구소 2000 해양과환경연구소 연구논문집 Vol.24 No.-
The authors carried out a model experiment of continuoius hairtail hand line on the rooftop in order to obtain the fundamental data on elimination of labor with haritail hand line in the coast of Jeju. The results are as follow ; 1.The continuous main line was rotated smoothly by driving roller. 2.The branch lines and hooks on a main line which was rotated by rotary machine were entangled slightly. 3. The branch lines attached to rubbered model of hairtails to hooks were rotated continuously by the rotary machine.
서두옥 제주대학교 해양연구소 1979 해양자원연구소연구보고 Vol.3 No.-
The wind waves in the coast of Jeju Island were computed applying Hidaka formula, by use of wind data which observed at Jeju and Seogwipo. Meteorological observatorg from Januauy l973 to December 1977 to calculate the stability of the artifical fish reef that will put off the coast of Jeju Island. The result obtained were summarized as follows ; 1. Maximum wind direction and velocity of Jeju coast were NW 17.4% and 8.8m/sec. That of Seogwipo coast were NE 34.0% and 6.7 m/sec. 2. The average wind waves in the coast of Jeju Island were as follows; <표본문참조>
徐斗玉 濟州大學 臨海硏究所 1979 해양과환경연구소 연구논문집 Vol.3 No.-
The wind waves in the coast of Jeju Island were computed applying Hidaka's formula, by use of wind data which observed at Jeju and Seogwipo. Meteorological observatory from Januauy 1973 to December 1977 to calculate the stability of the artifical fish reef that will put off the coast of Jeju Island. The result obtained were summarized as follows; 1. Maximum wind direction and velocity of Jeju coast were NW 17 4% and 8.8m/sec. That of Seogwipo coast were NE 34.0% and 6.7m/sec. 2. The average wind waves in the cost of Jeju Island were as follows; Station Height⒨ Period(sec) Length(m) Velocity(m/sec) Maximun 1.68 7.62 44.05 6.3 Jeju Average 1.22 5.50 33.07 6.10 Maximun 1.45 6.57 38.83 6.57 Seogwipo Average 1.19 4.73 28.51 6.26