• Journal of Korean Society of Transportation
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• v.29 no.2
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• pp.123-131
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• 2011

This study proposes a model for road surface temperature prediction on basis of the heat-energy balance equation between atmosphere and road surface. The overall model is consisted of two types of modules: 1) Canopy 1 is used to describe heat transfer between soil surface and atmosphere; and 2) Canopy 2 can reflect the characteristics of pavement type. Input data used in the model run is obtained from the Korea Meteorological For model validation, the observed and predicted surface temperature data are compared using data collected on MoonEui Bridge along CheongWon-Sangju Expressway, and the comparison is made on winter and other seasons separately. Analysis results show that average difference between two temperatures lies within ${\pm}2^{\circ}C$ which is considered as appropriate from a micrometeorology point of view. The model proposed in this paper can be adopted as a useful tool in practical applications for winter maintenance. This study being a fundamental research is anticipated to be a starting point for further development of robust surface road temperature prediction algorithms.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.11a
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• pp.165-168
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• 2003

네트워크 시스템이 발달하면서 다양한 컴퓨터들을 연결하는 클러스터링 시스템 구축이 용이해졌다. 이러한 이기종 클러스터 환경을 구축함에 있어서 노드들간의 성능 분균형으로 인한 문제가 야기되는데 본 논문에서는 Message Passing 방식을 이용한 클러스터링을 구축함에 있어서 노드들의 자원의 정보를 이용하여 메모리의 과부하를 최대한 예방하여 작업을 메모리 여유가 있는 노드로 이주시킴으로써 시스템 안정성과 자원을 균등하게 사용할 수 있도록 제안하였다. 제안한 알고리즘을 구현하기 위해서 이기종 클러스터 환경에서 MPI를 이용하여 2차원 열에너지 전도 계산과 Matrix 곱셈 프로그램을 이용하여 제안한 알고리즘과 GSS, Send 알고리즘, Weighted Factoring알고리즘들과 상대 비교를 하였다.

• Environmental and Resource Economics Review
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• v.16 no.1
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• pp.27-63
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• 2007

Using the CGE model, this paper investigates economic impacts of a shortage in crude oil resulting from voluntary export restraints, OPEC's agreement of a cut in oil production, and/or a storing on speculation. Unlike most previous studies considering oil price as the unpredictable variable, this study constructs the model to determine the oil price endogenously under the condition of an insufficient supply of crude oil. According to IEA's extraordinary steps for a shortage of crude oil, we investigate an economic impact of 7~12% shortage below the level of business as usual. The results show that oil price soars by 17.3~33.5%, the rate of economic growth falls by 0.52~0.96%p, and the consumer price index(CPI) rises by 0.8~1.51%p. These results imply that increasing in 1%p of oil price results in decreasing in 0.03%p of economic growth and increasing in 0.045%p of consumer price index. The production of electricity declines because of the increase in production cost. A shortage of crude oil has an effect on sources of electricity. Most reduction in electricity generation occurs from the reduction in the thermal power generation which is highly dependent on crude oil. The shortage of crude oil causes demand for petroleum to significantly decline but demand for coal and heat to increase because of the substitution effect with petroleum. Demand for gas rise in the first year but falls from the second year.