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HVDC 추가도입에 대한 제주도 계통의 정태 안정도 분석
신성수(Seong-Su Shin),김도형(Do-Hyung Kim),김재언(Jae-Eon Kim) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.11
This paper presents results of comparing CSC HVDC with VSC HVDC on the stability In case of connecting Haenam to Jeju electrical power system. the steady-state stability in the case of Jeju electrical power system with CSC HVDC or VSC HVDC, is validated through PV curve, QV curve of Jeju electrical power system. And in the case of esc HVDC, it is considered that synchronous condenser is connected or not. The results are compared each other. PSS/E simulation tool is used for the steady-state stability analysis.
신성수(Seong-Su Shin),김기현(Gi-Hyun Kim),이상익(Sang-Ick Lee),배석명(Suk-Myong Bae) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.4
오늘날 전기제품의 사용 중가로 전력소비는 증가하였으나 전기로 인한 화재와 인명사고는 여전히 높은 비율을 차지하고 있다. 특히 소규모 점포가 밀집된 재래시장고가 같은 경우 노후화된 전력설비와 안전관리 자의 부재로 전기안전의 사각지대로 놓여있다. 본 논문에서는 전기재해 예방을 위한 통합 모니터링을 통하여 전기 사고의 위험요소를 사전에 감지하여 능동적으로 대처할 수 있는 IT기술을 접목한 전기안전감시시스템의 개발을 제시하고자 한다.
신성수(Shin Seong Su) 한국체육교육학회 2002 한국체육교육학회지 Vol.6 No.2
This study is designed to present information necessary for the enhancement of efficiency of physical education through the analytic study of teachers` feedbacks in elementary schools` P.E. With this in mind, the researcher made an analysis of the relationship between feedbacks and ALT-PE, the cause of the time spent by feedback pattern, and the relationship between feedbacks and class flow as a vehicle for a statistical approach method, and at the same time put to use a qualitative approach method by working with two teachers with a high ratio of feedback and two teachers with a low ratio of feedback. In order to achieve the purpose of this study, the researcher worked with a total of 30 teachers in charge of the third and fourth graders at elementary schools at North Chungcheong Province, recording mat-based activities(the scene of students rolling back and forth on a mat) with the aid of a video camera. The researcher analyzed ALT-PE with the help of an interval observation record(six-second observation, six-second record), calculating the percentage of the variables of teaching behavior including feedback on the basis of five-second observation and five-second record with the help of SPSS Ver 10.0 and collecting materials based on class observation, in-depth interviews and descriptive statements by working with the four subjects. The researcher has come to the following conclusions based on the method and procedures of this study. First, the analysis of the correlation between feedbacks and ALT-PE shows that there was no significant correlation between each feedback pattern and ALT-PE. This resulted from the fact that feedbacks, which were required for the accomplishment of learning objectives for lack of contents-knowledge about class assignments, were not realized and that there was no proper feedback after supervision in consideration of a significant negative correlation between supervision and feedbacks. Second, the analysis of the cause of ALT-PE consumption by feedback pattern indicates that the ratio of feedbacks was lower than other teaching behavior and that static behavior feedbacks were more than other feedbacks. This result is attributable to the fact that teachers full or bereft of feedbacks were lacking in abilities to command linguistically and functionally proper feedbacks in the real situation of class for lack of previous training and field training and that their feedbacks were limited to only daily praises for lack of established teaching materials. Third, feedbacks were presented more at stages of unfoldment and settlement. Static behavior feedbacks in particular were more freely used at these stages and static skill feedbacks were least freely used. And negative feedbacks were relatively frequently used at these stages. These results were due to lack of knowledge about learning assignments on the part of teachers and passive supervision