DTMNs를 위한 신뢰성 있는 데이터 전송 지원 방법

서두옥,이동호 (사)디지털산업정보학회 2009 디지털산업정보학회논문지 Vol.5 No.4

While portable and wireless devices are pouring, a new network technology is needed as a breakthrough. The new network technology features large delays, intermittent connectivity, and absence of an end-to-end path from sources to destinations. A network which has one of those characteristics is called DTNs(Delay Tolerant Networks). The main 4 routing methods have been researched so far in extream environment. In this paper, we look into the reliability of DTMNs(Delay Tolerant Mobile Networks) in several different situations, and propose an algorithm that selects a positive routine by sending the only information of its position when making a connection to a detected node. We simulate the proposed algorithm here in DTN using ONE simulator. As a result, it shows that the algorithm reduces the number of message transmission each node.

가청 수중음에 대한 오징어 어군의 위집

서두옥 부경대학교 수산과학연구소 1995 硏究業績集 Vol.20 No.-

濟州島沿岸의 風浪 計算

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

人工魚礁에 關한 硏究 : 魚礁에 蝟集된 稚魚의 生産 The Production of Fingerlings Thronged around the Artificial Fishreefs.

朴正埴,孫泰俊,徐斗玉 제주대학교 1978 논문집 Vol.10 No.-

Study was intended to make fingerlings thronged and being captured by four types of the artificial fishreefs settled in the waters of Seogwipo, Jeju do. The artificial fishreefs of tree vertical types composed of cryptomeria had an effect on the throngings of fingerlings into them. For fingerlings of saurel (Trachurus japonicus), yellow tail (Seriola quinqueraaiata). pudderfish (Seriolos purpurascens), and file fish (Monacanthus cirrhifer) which were thronged into artificial fishreefs it was efficient to fish after they were attractted by under water fish lamp to fish- ing ground in which the use of fishing gear was possible. The maximum distance at which fingerlings can be attracted by underwater fish lamp (DC 24V, 300W, Incandecent lamp) was 11.4m while its underwater light intensity of attraction and the volume of attraction being 0.5 Lux and 22.9Ⅹ10²m³respectively. When the throngings around the middle layer of the artificial fishreefs were caught it was not suitable to use the leaded trap of the pot type.

제주도 연안의 수중소음-Ⅱ : 동부연안

서두옥,정용진 제주대학교 1986 논문집 Vol.23 No.-

Underwater ambient noises were investigated at 12 points in the eastern coast of Cheju Island The underwater ambient noise was present as a sound pressure level for each frequences. The results were as follows: 1 The sound pressure level of the underwater ambient noise was the highest of that in 12 points at 100 m in the depth of water at station D. 2 The vertical average sound pressure level at 200Hz was measured at 10m. 50m and 100m in the depth of water The values were 88dB. 87dB and 90dB, respectlvely. 3 The average sound pressure level on 12 points was measured 88 dB at 200Hz in the frequency.

濟州島 沿岸의 水中騷音 -Ⅰ : 濟州港과 楸子島사이 Between Cheju Harbor and Chuja Island

鄭龍晋,邊昌翊,徐斗玉 濟州大學校海洋資源硏究所 1986 해양과환경연구소 연구논문집 Vol.10 No.-

濟州港과 楸子島를 연결하는 線上의 3個點을 測定位置로 하여 水中騷音을 測定하고, 이것을 測定周波數에 따른 音壓準位로 分析한 結果를 要約하면 다음과 같다. 1) 濟州港과 楸子島 사이의 水中騷音은 夜間에 높고 晝間에 낮으며, 測定點에서 音壓準位의 平均値의 差는 測定點 A, B, C에서 各各 3.7∼14.0 dB, 6.3∼9.1 dB, 10.0∼15.3 dB 였다. 2) 測定點에 對한 수직적인 平均音壓準位는 周波數 75Hz의 水深 20m, 50m, 100m에서 A는 各各 105.7 dB, 107.2 dB, 107.5 dB, B는 各各 105.7 dB, 103.9dB, 105.9 dB, C는 103.0 dB(20m), 105.8 dB(50m)였다. 3) 測定點에 對한 수평적인 平均音壓準位는 周波數 75Hz의 水深 20m, 50m, 100m에서 各各 104.8 dB, 105.6 dB, 106.7dB였다. 周波數 75∼5000Hz에서 音壓準位의 平均은 水深 20m, 50m, 100m에서 各各 83.3 dB, 84.4 dB, 85.9dB였다. 4) 3個 測定點에서 周波數 75Hz 最高値의 平均音壓準位는 測定點 A, B, C에서 各各 108.4 dB, 107.4 dB, 108.1 dB였다. Underwater ambient noises were investigated at three stations (A, B and C) connected to a straight line from Cheju harbor to Chuja Island. The underwater ambient noise was present as a sound pressure level for each measured frequence. The results were as follows: 1) The underwater ambient noises were high at nighttime but low at daytime. The differences of each value of average sound pressure level at station A, B and C were 3.7-14.0 dB, 6.3-9.1 dB and 10.0-15.3dB, respectively. 2) The vertical sound pressure level of each station was measured at 20m, 50m and 100m in the depth of water. The values of station A 105.7dB, 107.2dB and 107.5dB, respectively. The Values of station B were 105.7dB, 103.9dB and 105.9dB, respectively. The values of station C were 103.0dB at 20m and 105.8dB at 50m. 3) Each value of horizontal sound pressure level at station A, B and C was 104.8dB at 20m, 105.6dB at 50m and 106.7dB at 100m in the depth of water. Each mean values of sound pressure level from 75 to 5000Hz was 83.3dB at 20m, 84.4dB at 50m and 85.9dB at 100m in the depth of water, respectively. 4) Each mean values of maximum sound pressure level at 75Hz was 108.4dB at station A, 107.4dB at station B and 108.1dB at station C.

제주도연안의 갈치 채낚기 어업에 있어서 집어정의 수중조도

서두옥 제주대학교 해양연구소 1988 해양자원연구소연구보고 Vol.12 No.-

魚礁에 關한 硏究(1) : 西歸浦 沿岸의 海底地形에 關하여 The submarine topography of Seogwipo coast

辛亨鎰,朴正埴,徐斗玉 제주대학교 1976 논문집 Vol.8 No.-

Submarine topography and the force of the wind investigated in Seogwipo coast owing to set up articial fishreef. The results obtained are as follows ; 1. Bottom of position A and B was took the part of the natural fishreef, and 20-40m depth area of a reasonable waters to set up fishreef was 1.43㎢. 2. Position C locating between position A and B was formed to slow inclination from the open sea, where was assumed to waters require to the throng equipment of fishies. 3. Maximum wind velocity of the investigated waters was 18.5m/sec from Oct. 1975 to Sep. 1976, and then drift current was 25.9㎝/sec, depth of frictional influence was 188m.

水中擴聲器의 試作

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.

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.