• 제목/요약/키워드: Maintaining

검색결과 7,593건 처리시간 0.033초

WATER RESOURCES POLICY AND CONFLICT RESOLUTION IN SOUTH KOREA : WIN-WIN STRATEGY

  • Choi, Yearn-Hong;Lee, Tae-Sam
    • Water Engineering Research
    • /
    • 제2권4호
    • /
    • pp.231-241
    • /
    • 2001
  • Since South Korea has uneven rainfall and deteriorating water quality, it is imperative to create a comprehensive water resources policy and management. This paper is to adopt a win-win policy for upstream-downstream local governments that have been in water rights-related disputer or conflicts in the process of allocating water and maintaining water quality. The Win-Win Policy can be an integrated river-basin approach. We define the win-win policy, introduce the win-win case of Delaware River and Colorado River in the United States, and suggest the win-win policy for Nakdong River in South Korea. Nakdong River is chosen for this paper because it has more serious problems in preserving water quantity and maintaining water quality.

  • PDF

A Supercapacitor Remaining Energy Control Method for Smoothing a Fluctuating Renewable Energy Power

  • Lee, Wujong;Cha, Hanju
    • Journal of Electrical Engineering and Technology
    • /
    • 제10권1호
    • /
    • pp.146-154
    • /
    • 2015
  • This paper proposes a control method for maintaining the energy level for a supercapacitor energy storage system coupled with a wind generator to stabilize wind power output. Although wind power is green and clean energy source, disadvantage of the renewable energy output power is fluctuation. In order to mitigate the fluctuating output power, supercapacitor energy storage system (SCESS) and wind power simulator is developed. A remaining energy supercapacitor (RESC) control is introduced and analyzed to smooth for short-term fluctuating power and maintain the supercapacitor voltage within the designed operating range in the steady as well as transient state. When the average and fluctuating component of power increases instantaneously, the RESC compensates fluctuating power and the variation of fluctuating power is reduced 100% to 30% at 5kW power. Furthermore, supercapacitor voltage is maintained within the operating voltage range and near 50% of total energy. Feasibility of SCESS with RESC control is verified through simulation and experiment.

저온환경하 NT(Nano Technology)구조 단열재를 사용한 단열거푸집의 열적성능평가에 관한 실험적 연구 (A Experimental Study of Insulation Performance of Insulated Forms Utilizing NT frame Insulation at Low Temperature)

  • 박장현;김목규;김형철;이한승
    • 한국건축시공학회:학술대회논문집
    • /
    • 한국건축시공학회 2015년도 추계 학술논문 발표대회
    • /
    • pp.179-180
    • /
    • 2015
  • In this study, the experimental study on Insulation performance of insulated forms utilizing NT frame heat insulation at low Temperature. For this study, placing insulated TEGO film plywood based form between two constant temperature and humidity chamber that maintaining 10℃, decrease temperature of one chamber to -10℃ and -20℃. Each of steps, maintaining period of temperature was 1 hour. After placing the insulated form, measure temperature of outside if insulated form. As a result of experiment, temperature difference of Fumed Silica Vacuum insulation was lowest.

  • PDF