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이한민(Lee Hanmin) 담화·인지언어학회 2010 담화와 인지 Vol.17 No.2
In this study, the realization aspect of Indirect Speech Acts(IDSA) in Korean and English are compared to clarify the reason we use the method of IDSA despite we can perform speech acts directly. The subject of analysis was limited to interrogative sentences and TV drama scripts were used as research materials. As a results, the major motives to perform IDSA were found to be 'lessening the burden' and 'emphasizing'. It is interesting that the same method can give two opposite effects. Because of the reason that performance and understanding of IDSA ultimately realize on the context of verbal communications, pragmatical factors should be considered to infer the meaning of IDSA. The significance of this study can be found in the respect of considering the speaker's intentions delivered through IDSA in relation to the situations in which IDSA is performed.
전기철도시스템에 에너지저장시스템 적용 해석에 관한 연구
이한민(Hanmin Lee),김길동(Gildong Kim),안천헌(Cheonheon An),장길수(Gilsoo Jang),권세혁(Saehyuk Kwon) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.11
The energy storage system(ESS) is needed to be developed to use regeneration energy when the vehicle is braking. The ESS is able to store and discharge energy extremely quickly, consequently enabling a complete exchange of energy between vehicles, even if they are not braking and accelerating at precisely the same time, as is most frequently the case in everyday service. The energy saving rate is related to the headway. If the headway is long/short, the energy saving goes up/down. When the headway is short, the ESS can not save much regenerative energy. The headway of SeoulMetro as the worst case is very short in Korea urban transit system. So, the energy saving rate will be very low. If the ESSs are applied to another railway system, we can expect that the effectiveness is better than the results of SeoulMetro. This paper presents effects of energy saving obtained by applying the ESS to Seoul Metro.
이한민(Hanmin Lee),김길동(Gildong Kim),오세찬(Sehchan Oh),박성환(Sunghwan Park) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.4
The brake systems of the rolling stocks are generally consisted of electrical and mechanical brake systems. Because of its inherent structure of the each brake system, the electrical brake system is mainly used at the high speed range while the mechanical brake system is used at the relatively lower speed range. It is desirable for the rolling stocks to apply the entire electrical brake system. However, since the brake force from electric brake system is not enough to stop the rolling stock within the legal stop distance. Therefore, the mechanical brake system is indispensable, to rolling stocks. In general, the vast majority of the world trains are equipped with mechanical braking systems which use compressed air as the force to push block on to wheels or pads on to discs. These mechanical systems are known as air brake or pneumatic brakes. For the air brake system, basically huge scale air compressor is equipped and the long pipe line is complexively connected. Since mass of these air brake components, it is difficult to be a light weight equipment and the long pipe line raise the maintenance problem. In order to overcome these problems of air brake system, the hydraulic brake system is proposed in this research. The hydraulic brake system makes the whole weight of brake equipment be light and large braking force can be applied. Therefore, in this research, the validity and advantages of applying the hydraulic brake system are reviewed.
도시철도 에너지저장시스템의 전력조류계산에 의한 회생에너지 이용 효율에 관한 연구
이한민(Hanmin Lee),김길동(Gildong Kim),정의진(Euijin Jeong),이장무(Chanmu Lee) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.4
본 논문은 에너지 저장기술과 도시철도 시스템의 연계에 관한 기본 연구를 수행하고, 시공간적 변화를 가지는 철도부하에 대한 전력조류 분석을 수행한다. 이를 바탕으로 운행 조건에 대한 에너지 저장시스템의 에너지 이용 효율을 계산한다.