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풍력발전단지가 연계된 전력계통에서 상정고장을 고려한 발전력 재조정에 관한 연구
최수현(Soo-Hyun Choi),김규호(Kyu-Ho Kim) 대한전기학회 2017 전기학회논문지 Vol.66 No.2
This paper studies on effective rescheduling of generation when the single line contingency has occurred in power system with wind farm. The suggested method is formulated to minimize the rescheduling cost of conventional and wind generators to alleviate congestion. The generator rescheduling method has been used with incorporation of wind farms in the power system. Since all sensitivity is different about congestion line, Line Outage Distribution Factor(LODF) and Generator Sensitivity Factor(GSF) is used to alleviate congestion. The formulation have been proccessed using linear programming(LP) optimization techniques to alleviate transmission congestion. The effectiveness of the proposed rescheduling of generation method has been analyzed on revised IEEE 30-bus systems.
최수현 ( Soo-hyun Choi ),손철수 ( Cheol-su Son ),김원중 ( Won-jung Kim ) 한국정보처리학회 2004 한국정보처리학회 학술대회논문집 Vol.11 No.2
인터넷 서비스의 확대에 따라 사용자는 많은 웹 사이트에 접근해 자원을 활용하게 되었고, 이와 함께 정보 시스템에 대한 의존도가 높아지면서 인터넷 보안에 대한 인식도 커지게 되었다. 본 논문에서는 보안 서비스 중에서 무선 단말기를 이용한 사용자 인증에 대해 연구하였다. EAMS(Enhanced Account Management System)를 구축하여 사용자 과실 또는 고의에 의한 정보 시스템의 침해를 막고 무선 단말기를 사용하여 로그인 정보와 2차 인증을 받아 사용자가 시스템 계정에 접근함으로서 사용 시스템에 대한 신뢰도와 보안 수준이 향상된다.
최수현(Choi, Soo-Hyun),유정균(You, Jong-Kyun),박기태(Park, Ki-Tae),백일현(Baek, Il-Hyun),박소진(Park, So-Jin) 한국산학기술학회 2013 한국산학기술학회논문지 Vol.14 No.9
화력발전소로부터 배출되는 이산화탄소를 분리하기 위하여 급수가 다른 아민을 혼합한 개선 흡수제를 개발 하고자 하였다. 급수가 다른 1, 2, 3급 아민을 혼합한 후 이산화탄소 부분압에 따른 이산화탄소 흡수능을 조사하였다. 동일한 압력에서 이산화탄소 흡수능은 3DMA1P 30wt%>3DMA1P 27wt%+MEA 3wt%>3DMA1P 27wt%+DEA 3wt% 순으로 나타내었으며, 이는 3급인 3DMA1P에 2급인 DEA보다는 1급인 MEA를 혼합하는 것이 우수한 흡수능을 보이 고 있다. 따라서 흡수능이 우수한 3급 아민에 흡수속도를 높이기 위하여 1급 아민을 혼합하는 것이 유리함을 알 수 있다. 최종적으로 준경험 기액 평형모델을 이용하여 실험 결과를 계산한 결과 실험치와 잘 일치하였다. The advanced absorbent that used amine mixture with different order were developed to separate carbon dioxide emitted from fossil fuel power plant. The carbon dioxide absorption capacity for mixtures with different amine(primary, secondary and tertiary) were investigated according to CO₂ partial pressure. The carbon dioxide absorption capacity at the same pressure is ordered as 3DMA1P 30wt%>3DMA1P 27wt%+MEA 3wt%>3DMA1P 27wt%+DEA 3wt%. The result indicates that mixing tertiary amine with primary amine yields more efficient carbon dioxide absorbent than mixing tertiary with secondary amine does. Finally, the predicted semi-empirical gas-liquid equilibrium model fitted with experimental results.
한국어 교재의 요약하기 관련 활동 분석 연구 - 학문 목적 한국어교육과 관련성에 주목하여 -
최수현 ( Choi Soo-hyun ) 한성대학교 한성어문학회 2017 漢城語文學 Vol.37 No.-
The basic ability of university students is to understand, analyze, and utilize knowledge. It is very closely related to the summary activities. Summarizing means identifying the content structure and format of text and selecting a central content and reorganizing it with new text. Therefore, it is a very difficult activity for Korean students as well as foreign students. Previous studies have shown that foreign students need to be educated how to summarize. However, research has not shown that foreign students before entering university how to be educated. Therefore, it analyzed the textbooks used by the Korean language institutions, which are used by institutions in the Universities. And studied summary activities that helped them perform academic activities in college. we wanted to find out how much education is happening to foreign students who enter a university, which is a very important but difficult way to learn about foreign students. Seeking to extract summaries related to learning activities that are helpful to foreign students and analyze the activities involved in the university, we wanted to find out how much education is happening to foreign students who enter a university, which is a very important but difficult way to learn about foreign students. As a result, there was a summary of summaries, but there were a number of summary activities that were targeted mostly for read text and not various summaries, such as listening and summarizing frequently used in college. Also, the type of text was focused on reading text. Only two activities concerning the background of college life. Also there was only a few activities in the books that to find out the structure. There was also a very small amount of activity in understanding the structure of long texts. Although there was one problem with using two text messages, the problem was that the problem was not enough to prepare a complex text summary in the university. Through this study, it has become an opportunity to learn about the summary that should be provided to academic learners in the future.