• Title/Summary/Keyword: sea point

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A Study on Target Selection from Seeker Image of Aerial Vehicle in Sea Environment (해상 탐지 영상에서의 비행체 표적 선정에 관한 연구)

  • Kim, Ki-Bum;Baek, In-Hye;Kwon, Ki-Jeong
    • Journal of the Korea Institute of Military Science and Technology
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    • v.20 no.5
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    • pp.708-716
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    • 2017
  • We deal with the target selection in seeker-detection image through network, using the detection information from aerial vehicle and the target information from surveillance and reconnaissance system. Especially, we constrain the sea battle environment, where it is difficult to perform scene-matching rather than land. In this paper, we suggest the target selection algorithm based on the confidence estimation with respect to distance and size. In detail, we propose the generation method of reference point for distance evaluation, and we investigate the effect of pixel margin and target course for size evaluation. Finally, the proposed algorithm is simulated and analyzed through several scenarios.

Part of Information and Communication by occurrence of the earthquake (지진이 발생했을 때의 정보통신의 역할)

  • Kim, Jong-Yun;Shin, Hyun-Sik
    • The Journal of the Korea institute of electronic communication sciences
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    • v.1 no.2
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    • pp.95-101
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    • 2006
  • Those days, not only Many peoples are killed and the wounded by effective of earthquake sea wave in Indonesia, but also our country effected by earthquake in adjoining sea to japan. At this point, preparation to earthquake and the point of quickly communication by happened earthquake. For this reason perceptible observation post are making so quickly communication system to zone by effective range of earthquake, and develope than more quality observation tool, contribute to keep citizens property and life to a minimum by earthquake damaged.

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Search of submarine discharge locations with multi-temporal thermal infrared images and ground radar surveys

  • Onishi K.;Sairaiji M.;Rokugawa S.;Tokunaga T.;Sakuno Y.
    • Proceedings of the KSRS Conference
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    • 2004.10a
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    • pp.685-688
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    • 2004
  • Fresh water discharge from the sea floor strongly affects a coastal ecology and the diffusion of contaminants. Much fresh water discharge has been found in the edge of Kurobe alluvial fan, in which annual rainfall is over 4000mm and there is abundant groundwater. However, it is difficult to find the groundwater discharge, thus the search of possible areas with some remote sensing tools is required. Because the temperature of the discharge point is relatively low compared with the surrounding sea water surfaces, there is a possibility to detect the area as an irregular zone of thermal infrared images. Two anomalous temperature zones, which have no surface streams from rivers, are detected by ASTER thermal-infrared images. One of them was verified as the groundwater discharge point by dives. In addition, the distribution of water table under the land side of the two areas is also detected as irregular zones by a ground-penetrating radar

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A STUDY ON THE SECULAR VARIATION OF ZOOPLANKTON BIOMASS IN THE EASTERN AREA OF THE YELLOW SEA (한국 서해의 동물성 플랑크톤량의 경년 변화에 관한 연구)

  • KIM Yong Sool
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.4 no.3_4
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    • pp.99-102
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    • 1971
  • The present paper deals with secular analysis of zooplankton biomass in the eastern area of the Yellow Sea during the last seven years from 1963 to 1969. The annual variation of zooplankton biomass in the research area shows increase since October 1965, the lowest point. The increasing shape is a parabola expression, BM= 0.0146 $T^2+0.0448T+38.0436$ (BM, Biomass; T, Time, of which zero point is placed at December 1965).

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Part of Information and Communication by occurrence of the earthquake (지진이 발생했을 때의 정보통신의 역할)

  • Kim, Jong-Yun;Shin, Hyun-Sik
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • v.9 no.1
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    • pp.1171-1178
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    • 2005
  • Those days, not only Many peoples are killed and the wounded by effective of earthquake sea wave in Indonesia, but also our country effected by earthquake in adjoining sea to japan. At this point, preparation to earthquake and the point of quickly communication by happened earthquake. For this reason perceptible observation post are making so quickly communication system to zone by effective range of earthquake, and develope than more quality observation tool, contribute to keep citizens property and life to a minimum by earthquake damaged.

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A Study on The Role of Communication at Disaster Managing in Modern Societies (재난 발생시 국가 통합통신망 구축에 관한 연구)

  • Shin, Hyun-Shik
    • Proceedings of KOSOMES biannual meeting
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    • 2008.05a
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    • pp.205-211
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    • 2008
  • Those days, not only many peoples are killed and the wounded by effective of disaster sea wave in Indonesia, but also our country effected by disaster in adjoining sea to japan. At this point, preparation to disaster and the point of quickly communication by happened disaster. For this reason perceptible observation post are making so quickly communication system to zone by effective range of disaster, acd develope than more quality observation tool, contribute to keep citizens property acd life to a minimum by disaster damaged.

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The Zhao Sino-Korea Sea Communications & Ship-Cultural Exchange (장보고현상 급기대당대적계시)

  • Zhu, Jianjun
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2000.06a
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    • pp.185-190
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    • 2000
  • The concept of Chang Po-Go phenomenon is put forward and discussed in this paper from the point of view of international rationships in north-east Asia. Superfically, Chang Po-Go phenomenon showed trade prosperity on north-east Asia seas, but he nature of the phenomenon lies in the rising and strengthening of korea sea power. As works of the combination of general environment and individual heroism Chang Po-Go phenomenon can bring us some enlightenment on reform and open policy.

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An Implementation of Elliptic Curve Point Counting (타원곡선의 위수 계산 알고리듬의 구현)

  • 김영제;유영보;이민섭
    • Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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    • 2001.11a
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    • pp.3-8
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    • 2001
  • 여러 가지 타원곡선을 이용한 암호 프로토콜을 위해서는 안전한 타원곡선의 선택이 필요하고 안전한 타원곡선의 조건은 그것의 크기와 밀접한 관계가 있다. 현재까지 알려진 타원곡선의 위수를 계산하는 알고리듬으로는 Schoof의 계산법, 이를 개선한 Schoof- Elkies-Atkin(SEA)방법, 그리고 Satoh-Fouquet-Gaudry-Harley(Satoh-FGH)방법 등이 있다. 이 논문에서는 표수(characteristic) 2인 유한체 위의 타원곡선에 대한 SEA 방법에 대해서 설명하고 그 구현의 예를 보인다.

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Optimum mesh size of the numerical analysis for structural vibration and noise prediction (구조물 진동.소음의 수치해석시 최적 요소크기는 .lambda./4이다.)

  • Kim, Jeung-Tae;Kang, Jun-Soo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.21 no.11
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    • pp.1950-1956
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    • 1997
  • An engineering goal in vibration and noise professionals is to develope quiet machines at the preliminary design stage, and various numerical techniques such as FEM, SEA or BEM are one of the schemes toward the goal. In this paper, the research has been focused on the sensitivity effect of mesh sizes for FEM application so that the optimum size of the mesh that leads to engineering solution within acceptable computing time could be generated. In order to evaluate the mesh size effect, three important parameters have been examined : natural frequencies, number of modes and driving point mobility. First, several lower modes including the fundamental frequency of a 2-D plate structure have been calculated as mesh size changes. Since theoretical values of natural frequencies for a simple structure are known, the deviation between the numerical and theoretical values is obtained as a function of mesh size. The result shows that the error is no longer decreased if the mesh size becomes a quarter wavelength or smaller than that. Second, the mesh size effect is also investigated for the number of modes. For the frequency band up to 1.4 kHz, the structure should have 38 modes in total. As the mesh size reaches to the quarter wavelength, the total count in modes approaches to the same values. Third, a mobility function at the driving point is compared between SEA and FEM result. In SEA application, the mobility function is determined by the modal density and the mass of the structure. It is independent of excitation frequencies. When the mobility function is calculated from a wavelength to one-tenth of it, the mobility becomes constant if the mesh becomes a quarter wavelength or smaller. We can conclude that dynamic parameters, such as eigenvalues, mode count, and mobility function, can be correctly estimated, while saving the computing burden, if a quarter wavelength (.lambda./4) mesh is used. Therefore, (.lambda./4) mesh is recommended in structural vibration analysis.

A Study on Chemical Cleaning of Electrolytic Facilities with Sea Water (해수전해설비의 화학세정 최적화 방안에 관한 연구)

  • 이한철;이창우;현성호
    • Journal of the Korean Society of Safety
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    • v.14 no.4
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    • pp.114-119
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    • 1999
  • When NaOCl was generated and put into sea-water cooling machine in order to overcome the biological hindrances against sea-water cooling machine, it was converted into metallic ion, particularly Ca and Mg, as a hydrate in sea-water and is to stick to electrolyte as a side reaction. This phenomena make the distance between the electrolytes narrow to decrease the flow rate, which induces the local vortex flow which erodes the pole plate. Moreover, this increases the resistance of the electrolyte as well as voltage to decrease the electrolytic efficiency, which has curtailed a chlorine yield and caused a pole plate cut. We are able to overcome these problems by chemical cleaning and intend to extend the life-time of electrolyte and to increase output of the sea-water electrolysis facilities by studying optimal policy regarding chemical cleaning of electrolytic cell. Cleaning time of electrolytic facilities is determined when both increase in electrolytic efficiency and decrease in pole-plate voltage are 10%. At this time as operating current of electrolytic facilities is high, operating time is diminished. Whereas, parameter of end point determination according to cleaning is Mg ionic concentration in solution. When we use Cleaner as a 7wt% HCl, cleaning time is about 80min proper. We are able to maintain pole plate performance by protecting against pole plate cut by means of electrolytic by-product, improve operating rate of facilities, and cut down on maintenance expenditure after acidic cleaning.

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