• KSII Transactions on Internet and Information Systems (TIIS)
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• 제4권4호
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• pp.633-654
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• 2010

High quality camera images, with good contrast and intensity, are needed to obtain the desired information. Images need to be enhanced when they are dark or bright. The histogram equalization technique, which flattens the density distribution of an image, has been widely used to enhance image contrast due to its effectiveness and simplicity. This technique, however, cannot be used to enhance images that are either too dark or too bright. In addition, it is difficult to perform histogram equalization in real-time using a general-purpose computer. This paper proposes a histogram equalization technique with AGC (Automatic Gain Control) to extend the image enhancement range. It is designed using VHDL (VHSIC Hardware Description Language) to enhance images in real-time. The system is implemented with an FPGA (Field Programmable Gate Array). An image processing system with this FPGA is implemented. The performance of this image processing system is measured.

• 한국ITS학회 논문지
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• 제3권2호
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• pp.105-117
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• 2004

ITS중 첨단화물운송시스템(Commercial Vehicle Operations : CVO)는 ITS, GPS 기술을 이용하여 화물차량의 위치 및 상태정보를 실시간으로 제공하여, 즉각적인 작업지시 등을 통해 차량의 운행효율을 제고시키고 전자문서 서비스 등과 연계 하여 화물유통 전반을 효율적으로 관리할 수 있는 체제이다. 본 논문에서 화물 위치 및 화물 인식 시스템 중 거점(항만)의 자동게이트시스템을 제안한다. 단거리전용무선통신방식(DSRC)를 사용하여 자동게이트시스템을 구현한다. 여기서 DSRC는 차량에 탑재하는 OBE와 노변 기지국(RSE)사이에 무선통신방식이다. 특히 항만의 자동 게이트 시스템 구축에 있어서 실질적으로 사업의 적용성을 검토해 본 것으로 향후 구축된 각종 물류 단지 및 대단위 물류시설에는 국제 표준이 적용된 본 연구결과를 이용하여 구축하므로 통합 물류망이 완성될 수 있을 것이다.

• 한국농공학회:학술대회논문집
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• 한국농공학회 2002년도 학술발표회 발표논문집
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• pp.57-60
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• 2002

Developed power off automatic stanch that keep floodgate upper stream water level changelessly for curtailment of operation by manpower and electricity lead-in equal early investment expense that manual system floodgate and electric motion floodgate have. Human strength does not need in floodgate operation as that power off automatic floodgate open and close floodgate automatically by buoyancy and also, another thing power does not need. Before establish floodgate, effect that get to waterway when behaves repair calculation of correct waterway and decide size of floodgate accordingly and establish floodgate must do examination analysis fussily. power off automatic floodgate night soil that get between countermeasure is the urgentest low-down in reply because can do mistake in operation by phenomenon and so on about water resources by different plate shape change through a model experiment examine closely need to.

• 대한원격탐사학회지
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• 제34권4호
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• pp.579-590
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• 2018

Shipping of North Korea is not yet publicly well documented. Taedong River, the most important sea route of North Korea, is selected as a model study area to show how effectively a remote place can be investigated through the application of satellite-based Automatic Identification System (S-AIS) for understanding shipping and tracks of vessels which passed the lock gate in the Taedong River and visited the nearby ports on its track. S-AIS data of the year 2014 were analyzed on the basis of various time periods, country of registry and category of ships. A total of 325 vessels were observed. The ships under the flags of North Korea, Cambodia and Sierra Leone were found to be dominant in frequencies which accounted for 43.08%, 16.00%, and 8.92%, respectively. Trajectories of the 325 ships in the Yellow Sea were also checked according to the flags. It is concluded that some ships under the flags of Cambodia, Sierra Leone, Mongolia, Panama and Kiribati are regarded as flags of convenience, and ships without flag and ship type codes also comprised a remarkable portion out of the total ships.

• 해양환경안전학회:학술대회논문집
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• 해양환경안전학회 2003년도 추계학술발표회
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• pp.13-21
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• 2003

국제해사기구(IMO)는 해상인명안전협약(SOLAS)에 2002년 7월 1일부터 신조되는 총톤수 500톤 이상의 모든 선박에 자동선박추적장치(ATA)를 탑재시키도록 규정하였으나, 이 SOLAS 협약에 적용되지 않는 현재 운항중인 10,000톤 미만의 현존선은 ATA의 비탑재로 인하여 충돌사고가 빈발하고 있다. 본 논문에서는 ATA의 일부 요소기술이 국산화되어 있으나 가장 핵심적인 자동추적 알고리즘 개발은 아직 미비한 실정에 있으므로 자동추적 알고리즘의 핵심요소기술의 연구개발을 통하여 ATA를 국산화하여 연안에서 항해하는 중소형 선박에 보급함으로서 충돌사고 등을 미연에 방지하고자 한다.

• 해양환경안전학회지
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• 제9권2호
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• pp.5-13
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• 2003

국제해사기구(IMO)는 해상인명안전협약(SOLAS)에 2002년 7월 1일부터 신조되는 총톤수 500톤 이상의 모든 선박에 자동선박추적장치(ATA)를 탑재시키도록 규정하였으나, 이SOLAS 협약에 적용되지 않는 현재 운항중인 10,000톤 미만의 현존선은 ATA의 비탑재로 인하여 충돌사고가 빈발하고 있다. 본 논문에서는 ATA의 일부 요소기술이 국산화되어 있으나 가장 핵심적인 자동추적 알고리즘 개발은 아직 미비한 실정에 있으므로 자동추적 알고리즘의 핵심요소기술의 연구개발을 통하여 ATA를 국산화하여 연안에서 항해하는 중소형 선박에 보급함으로서 충돌사고 둥을 미연에 방지하고자 한다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 하계종합학술대회 논문집(2)
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• pp.92-95
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• 2000

본 논문에서 항만 자동게이트통관시스템에 사용하기 위하여 단거리전용통신(DSRC)용 OBE에 사용되는 5.8㎓ 송신기 MMIC를 설계하였다. 능동소자로는 GaAs MESFET을 사용하였고, 회로의 복잡도를 줄이기 위해 직접변조방식을 채택하였다. 인접채널간섭의 영향을 줄이기 위하여 드레인 재어 변조회로를 사용하여 -40dBc이하의 인접채널간섭과 70dB 이상의 on/off비를 갖는 5.8㎓ ASK송신기 회로를 설계하였다.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 1998년도 추계학술대회논문집:21세기에 대비한 지능형 통합항만관리
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• pp.19-49
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• 1998

I try to introduce three types of designs for automatic container operating system which are designed by Institute of Japan Port Research in 1996. Each types are designedto fit with the situations of Japan Port. 'A'type of these designs adapts Dual Container Crane, AGV, RMG, etc. 'B'type of these designs adapts Dual Container Crane, AGV, OHBC, RTG. And 'C'type of these designs adapts Single Container Crane, AGV, OHBC, etc. Even if three designs are introduced, they have some problems to solve for the future. They are Lashing work, Refeer container problem, check for container and seal in main gate, Establishing EDI NETWORK, etc. I expect that this paper will be a helps to development of our port industry.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1999년도 전력전자학술대회 논문집
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• pp.319-322
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• 1999

This paper presents a novel single-stage Power Factor Corrected(PFC) AC/DC forward converter with semi-automatic current shaping in order to achieve the unity power factor and an isolated output. Since the proposed circuit is combined a boost converter used for PFCs with a forward converter used for DC to DC conversion, the over-all size of system could be reduced. And thanks to the zero voltage switching(ZVS) in both switches, the voltage stress can be reduced considerably. A simple auxiliary circuit adopted into the secondary of transformer is composed of lossless components for reducing surge voltage. A prototype which has tow IGBT(Insulated Gate Bypolar Transistor) modules as switching device is manufactured to evaluate the proposed topology. The characteristics of the proposed circuit are tested, and the validity is verified by experimental results.

• 한국농공학회:학술대회논문집
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• 한국농공학회 2005년도 학술발표논문집
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• pp.85-90
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• 2005

A Water Level gauge which composes a water supply system for water demand, information transmission system and the solar storehouse electromotive floodgate, regarding the structure plan and a production of the nothing power automatic floodgate it described. The important point must solve but urgently will compare the water amount used from system establishment place or not one. and It must give proof the efficient characteristic of system, must solve the technical problem portion against revision of the accuracy of upper downstream canal which is information transmission system of the Self-controlled check gate. The solar floodgate is more economic with the base which will reach and the system construction which is accurate.