• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 B
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• pp.799-801
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• 2002

To develop GIS (Gas Insulated Switchgear), prediction of the flow field including pressure in GIS is very important. The transport phenomena in GIS including arc is also being studied in these days. In this study, to predict the arc behaviour for GIS with voltage rating up to 800kV developed by HHI (Hyundai Heavy Industries Co. Ltd.), the analysis of flow and electric field in GIS were investigated. To simulate the compressible flow in GIS, the CFX, commercial CFD code, was used. The movement of the piston and the electrode of the GIS was simulated with moving grid method, which was superior to the method of varying the property of cells in the aspect of accuracy and convergence of solution. The calculated maximum pressure within the puffer cylinder was matched with experimental data within 5% error. Also, the oscillation of pressure in GIS after the movement of electrode was well predicted.

• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제51권2호
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• pp.68-73
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• 2002

In compared with air insulated switchgear, GIS has a high efficiency and confidence. Insulation method using $SF_6$ gas has a very excellent insulation characteristic for high voltage equipment but has a characteristic that insulation heredity is changed for internal unequal electric field. So analysis of time varying electromagnetic field in GIS is very important for structure design and trouble diagnosis process. In compared with established method, the SNM(Spatial Network Method) in this Paper can observe variation of electromagnetic field with real time and get result very similar to measurement. In order to Know variation of electromagnetic field distribution in fast moving particle, we make used of SNM.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 춘계학술대회 논문집 전기설비전문위원
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• pp.105-108
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• 2004

This paper describes the influence of conducting particle in the coaxial cylindrical electrodes under alternating voltage condition investigated using breakdown electric field and electro magnetics simulation method. Simulated particle-location in GIS chamber were the particle on electrode, the particle on enclosure and free moving particle. As results, it was founded that in case of breakdown electric field of the GIS chamber, breakdown electric field of particle on electrode was the lowest, that of free moving particle was middle and that of particle on enclosure was the highest. And in case of the electric field analysis with particle locations, electric field of particle on electrode was the highest that of lifted particle was middle and that of particle on enclosure was the lowest. This results can offer a practical reference ra the insulation design of domestic GIS.

• 한국수자원학회논문집
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• 제33권6호
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• pp.793-804
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• 2000

실제 유역에서 강우량 분포는 시·공간적으로 많은 변화가 있으나 유출량 모의시에는 종종 유역내 동일한 강우량이 분포하는 것으로 가정하여 해석하게된다. 그러나 이러한 가정을 가지고 유출을 모의하게되면 그 정확성에 한계가 따르며, 태풍, 사이클론, 허리케인 등에서 종종 일어나는 이동강우의 경우에는 산출된 유출량의 정확성 문제가 더욱 크게 나타난다. 본 논문에서는 GIS기법을 이용하여 1999년 8월 2일 16:00에서 23:00까지 춘양관측소에서 관측된 등우선도를 활용하여 이동강우 유출특성을 분석하였다. 강우의 이동방향을 서로 다른 8가지 방향으로 달리하여 유출을 모의한 결과 복하천 실험 유역에서는 SE방향에서 최대 첨두유출량이 나타났다. 또한 서로 다른 이동속도를 갖는 이동강우에 따른 유출량을 속도별로 비교한 결과 속도가 낮을수록 더 큰 첨두유출량이 발생하였다. 따라서 유역에서의 유출을 모의하기 위하여 GIS를 활용하는 경우, 자료 준비의 간편성 및 계산시간의 단축과 같은 장점을 얻을 수 있을 것이다.

• 한국정밀공학회지
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• 제22권11호
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• pp.104-110
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• 2005

GIS(Gas Insulated Switchgear) is used in electric power system, to insure non conductivity, breaking capacity and operating reliability. The commercial dynamic analysis code COSMOS MOTION and 3-D modeling program SOLID WORKS were used to simulate dynamic analysis of the closing resistors of the GIS in this paper. To reduce chatter vibration of closing resistors, the motion of moving and fixed parts of closing resistors were simulated by varying the spring constant, the damping coefficient and the mass of moving and fixed parts. The simulated results were compared with experimental results. As a result, chatter vibration of closing resistors of the GIS could be reduced by using the results. These data can be used to determine the spring constant, the damping coefficient and mass of a moving part to reduce chatter vibration when the next model is developed.

• 유기물자원화
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• 제10권3호
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• pp.92-97
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• 2002

본 연구에서는 표본지역의 음식물쓰레기 수거요소를 GIS를 활용하여 분석하였다. 음식물쓰레기 수거요소인 수거인력과 장비를 구하기 위해 표본지역인 S동을 대상으로 환경미화원의 수거이동속도(43m/min), 수거이동계수(1.9), 수거이동거리(17,200m/day), 수거가능량(0.313kg/day)을 측정하였다. 이때, 소요인원 분석을 위한 수거이동계수는 GIS의 활용을 통한 표본지역의 직선거리 분석으로 가능하였고 다른 지역으로의 확대 적용 역시 GIS활용을 통한 각 지역의 직선거리 분석으로 가능하였다. 분석결과, N자치구 단독주택지역의 음식물쓰레기 수거인원은 총 10인이 소요되었으나 실제적으로 4개 수거업체가 수거를 담당함으로써 총 11인이 소요되었고 수거차량 역시 총 7대가 소요되었으나 실제적으로는 4개 수거업체가 수거를 담당함으로써 총 8대가 소요되었다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 C
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• pp.1670-1672
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• 2001

In compared with air insulated switchgear GIS has a high efficiency and confidence. Insulation method using $SF_6$ gas has a very excellent insulation characteristics for high voltage equipment but has a characteristics that insulation heredity is changed for internal unequal electric field. So analysis of electromagnetic field in GIS is very important basic data for structure design and trouble diagnosis process. In compared with established method, SNM in this paper observes variation of the electromagnetic field with real time and get result very similar to measurement. In order to know the variation of electromagnetic field distribution for transient response for time and position, variations are observed when metal particles are moving fast.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2002년도 Proceedings of International Symposium on Remote Sensing
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• pp.163-167
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• 2002

Recently, owing to performance elevation of telecommunication technology, increase of wireless internet's subscriber and diffusion of wireless device, Interest about LBS (Location Based Service) which take advantage of user's location information and can receive information in concerning with user's location is increasing rapidly. So, MOMS (Moving Object Management System) that manage user's location information is required compulsorily to provide location base service. LBS of childhood such as service to find a friend need only current location, but to provide high-quality service in connection with Data Mining, CRM, We must be able to manage location information of past. In this paper, we design distributed manage system to insert and search Moving Object in a large amount. It has been consisted of CLIM (Current Location Information Manager), PLIM (Past-Location Information Manager) and BLIM (Distributed Location Information Manager). CLIM and PLIM prove performance of searching data by using spatiotemporal-index. DLIM distribute an enormous amount of location data to various database. Thus it keeps load-balance, regulates overload and manage a huge number of location information efficiently.

• Spatial Information Research
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• 제11권4호
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• pp.439-452
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• 2003

Geographic Information System(GIS) market in Korea was made based on "the First Master Plan for the korean National GIS" Recently the private GIS market is growing rapidly for LBS, Telematics, Web Geographic Information Service. So, the purpose of this study is to make the development strategies reflected ′moving the core of GIS market′ from public to private sector. By using the Model of Added Value chain, the business model which reflect features of geographical information best, we analyzed markets and classified them into four fields along the uses and degrees of added value. The features of markets in each field are researched and the ways of development about each fields are established. And the business model for geoaphic information circulation is made for development of GIS. market. To realize the development strategies in each field, this study proposes the national roles.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.597-599
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• 2003

Moving pattern is as a kind of sequential pattern, which can be extracted from the large volume of location history data. This sort of knowledge is very useful in supporting intelligence to the LBS or GIS. In this paper, we proposed the continuous moving pattern mining approach in LBS platform and LBS Miner. The location updates of moving objects affect the set of the rules maintained. In our approach, we use the validity thresholds that indicate the next time to invoke the incremental pattern mining. The mining system will play a major role in supporting the various LBS solutions.