• Journal of Energy Engineering
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• v.8 no.1
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• pp.166-173
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• 1999

본 연구는 램지가격결정방식과 효율적요소가격결정방식을 이용하여 향후 국내 가스산업의 배관망공동이용시 발전용 천연가스의 가격 및 이용료 수준을 파악할 수 있는 천연가스 가격 결정의 이론적 모형을 도출하였다. 또한 사례분석을 통하여 램지가격결정방식(RCPR)과 효율적요소가격결정방식(ECPR)하에서 도출된 최적 가격 및 최적 이용료를 비교·분석하였고 결정변수들이 가격과 이용료에 미치는 영향에 대해서 분석하였다. 그 결과 RCPR에 의한 최적 이용료는 쿠르노 불완전 경쟁하에서 한계직접비용 보다 낮게 도출된데 반해서 ECPR에서는 한계직접비용보다 높게 도출됨으로써 가격결정방식에 따라 최적 이용료의 수준이 상이함을 보였다. 또한 도시가스용 및 발전용 가격은 RCPR 하에서 신규사업자 수가 증가할수록 하락하였고 이용료는 증가하여 한계비용에 접근하였다. 한편 최적 발전용 가격과 최적 이용료는 한계직접비용이 클수록 증가되었고, 역가격탄력성이 클수록 최적 발전용 가격은 증가하는 반면에 최적 이용료는 감소하였다.

• Proceedings of the KSME Conference
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• 2000.04b
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• pp.175-179
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• 2000

A combustion project was completed regarding the development of a high-flow-rate purge burner in cooperation with three city gas companies(Pusan, Taegu, Samchulli). The project, started in May 1991, aimed at purging the line-packed-gas safely and quickly before getting into gas pipe working or relocation. According to the results, the purging noise is less than 80dB due to silencer screen. multi-nozzle and outlet inserted tube employed. In addition, the developed burner shows an increased work efficiency of 40-50% more as compared to the performance of conventional purge equipments. The project result is regarded as the first high-flow-rate purge burner developed within Korea. contributing to shortening purge hours, safe field work and easiness of purge site selection.

• Fire Science and Engineering
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• v.17 no.1
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• pp.8-20
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• 2003

Natural gas has been supplied through underground pipelines and valve stations as a new city gas in Seoul. In contrast to its handiness the natural gas has very substantial hazards due to fires and explosions occurring from careless treatments or malfunctions of the transporting system. The main objectives of this study are to identify major hazards and to perform risk assessments after assessing reliabilities of the composing units in dealing with typical pipeline networks. there-fore two method, fault tree analysis ;1nd event tree analysis, are used here. Random valve stations are selected and considered its situation in location. The value of small leakage, large rupture, and no supply of liquefied natural gas is estimated as that of top event. By this calculation the values of small leakage are 3.29 in I)C valve station, 1.41 in DS valve station, those of large rup-lure are $1.90Times10_{-2}$ in DC valve station, $2.32$\times$10^{-2}$ in DS valve station, and those of no supply of LNG to civil gas company are $2.33$\times$10 ^{-2}$ , $2.89$\times$10^{-2}$ in each valve station. And through minimal cut set we can find the parts that is important and should be more important in overall system. In DC valve station one line must be added between basic event 26,27 because the potential hazard of these parts is the highest value. If it is added the failure rate of no supply of LNG is reduced to one fourth. In DS valve station the failure rate of basic event 4 is 92eye of no supply of LNG. Therefore if the portion of this part is reduced (one line added) the total failure rate can be decreased to one tenth. This analytical study on the risk assessment is very useful to prepare emergency actions or procedures in case of gas accidents around underground pipeline networks and to establish a resolute gas safety management system for loss prevention in Seoul metropolitan area.

• Journal of Korean Society for Geospatial Information Science
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• v.10 no.2 s.20
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• pp.97-105
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• 2002

Nowadays the gas utilities has been increasing constantly due to the expansion of the urban areas. The gas utility companies have adopted GIS technologies and been trying to computerize the management system for gas facilities to maintain up-to-dated information to forecast possible accidents and to minimize the casualties from the accidents. The major objective of this study is to develop a GIS-based gas accident management system which could facilitate early response and alternatives in the cases of the accidents. The system is able to provide the information for the pipes to be closed followed by selecting the location of the accident, and search all the relevant values connected to the location to provide all the information to minimize the casualties. In addition to that, the system can calculated the remaining amount of the gas in the pipes closed from the accident thereby providing more safer alternatives. In the future, more practical method needs to be made such as GPS-linked more integrated gas accident management system.