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정희용 ( Hee Yung Chung ),현운식 ( Un Sik Hyun ),강희정 ( Un Sik Hyun ) 대한설비관리학회 2011 대한설비관리학회지 Vol.16 No.1
Demand of electricity has been sharply increased mainly by climate change and expansion of national economy. In summer, electric demand has broken a peak demand every day and it is up to 70million kW according to the increase of cooling demand. Power reserve ratio also falls to 6%. Electric demand for summer cooling has effected to electric heating demand and it leads to the electric peak in winter. It is not desirable to build the additional power plant which needs the enormous investment to solve the electric peak load. Meanwhile, domestic natural gas industry supplies 1,400 million residential customers and numerous industrial and commercial users. Due to the inflexible distribution system of international natural gas market, it is required to take a certain amount of gas even if in summer, and storage cost has been increased. Consumption of the surplus gas for cooling in summer could reduce the storage cost. The purpose of this study is to suggest the desirable domestic gas supply system by analyzing power substitution effect of gas cooling and its ripple effect. It is expected that this study would contribute for electric and gas industry to increase the supply efficiency.
정희용 ( Hee Yung Chung ),강희정 ( Hee Jung Kang ) 대한설비관리학회 2003 대한설비관리학회지 Vol.8 No.1
The modem business management is showing the maximized interest in ROE(Return on Equity), related with the improvement of efficiency in capital and the trend of emphasis on the profit of investors. ROE could be defined as the measure for efficiency in business management which shows how effectively the invested capital is used. However, due to its nature of public interest, the city gas industry is being regulated by Government on ROE. In short, ROE is accepted only up to the level of the rate of time-fixed deposit interest. Shortage in infrastructure of domestic gas industries requires a continuous investment. The annual amount of facility investment by domestic gas industries reaches nearly W4obillion. If ROE is limited to the rate of time-fixed deposit interest, there could happen many problems such as contraction on facility investment, financial risk incline, and decrease in value of enterprise, etc,. This study concerns some rational measures for improvement by analyzing those problems with foreign cases and economy indices.