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오늘 본 자료
히트파이프 응축부의 초음파 분무냉각에 관한 실험적 연구
김영찬,한양호 대한설비공학회 2004 설비공학 논문집 Vol.16 No.1
In this study, the spray cooling heat transfer and working characteristics of the screen wick heat pipe with ultrasonic spray cooling system in condenser were experimentally investigated. The heat pipe was made of copper tube 300 mm long with inner diameter of 11.1 mm. The evaporator and condenser lengths of heat pipe were 40, 200 mm and the wick structure consists of two layer of 100 mesh copper screen. The experimental results show that the ultrasonic spray cooling increases the heat transfer rate on the condenser surface, and the total thermal resistance of heat pipe system decreases remarkably. A comparison is made for the two working fluids, water and ethanol. The surface temperature of the ethanol tube in evaporator section becomes higher than that of the water tube. Thus, the experimental result shows that water is more useful than ethanol as the working fluid because of increasing the operational limit within this experimental conditions.
김영찬 한국시뮬레이션학회 1992 한국시뮬레이션학회 논문지 Vol.1 No.1
This paper proposes an analysis method of petri nets(PNs) using the relational algebra(RA). More wpecifically, we represent PNs in relations of the relational model. Based on such representation, we first develop an algorithm for generating reachability trees of PNs. we then develop an algorithm for generating reachability trees of PNs. We then develop algorithms for analyzing properties of PNs, such as boundedness, conservation, coverability, reachability, and liveness. The advantage of this approach is as follows: First, the algorithms represented by RA can be easity converted to a query language such as SQL of the widely used, commerical relational database management systems(DBMSs). Second, we can alleviate the problem of state space explosion because relational DBMSs can handle large amounts of data efficiently. Finally, we can use the DBMS's query language to interpret the Petri nets and make simulation.
고속도로시스템의 정주기식 램프미터링을 위한 최적화모형의 개발
김영찬,빈미영 대한교통학회 1995 대한교통학회지 Vol.13 No.4
Peak-period congestion is a frequent occurrence on many freeways. Entrance-metering is an effective strategey in improving urban freeway traffic condition. This paper describes the prodecure to develop a computer program for proparing optimum ramp-metering stategies. Four existing ramp-metering optimaization models wer reviewed and evaluated in regared to their theories and actural performances. A optimization model was proposed in this paper. Final model takes aform of quadratic programming. The performance of the propeosed model wastest using FREFLO.
김영찬 상허학회 2012 상허학보 Vol.35 No.-
한국문학의 정신구조를 지배해왔던 기원으로서 4.19의 효과는 한국문학의 장(場)에서 그 실효를 다했다. 즉 1960년대 이후 한국의 자본주의 근대화 과정에 휩쓸리면서도 그것을 주체성의 내재적 조건으로 삼아 그와 갈등/공모하면서 전개되어왔던 해방 이후 근대문학이 이제 그 수명을 다함으로써, 4.19의 역사적, 문학적 기능은 완결되었다. 한국문학 비평/연구가 처한 현재의 상황은 이 근대문학의 끝 혹은 기원으로서 4.19의 역사적, 문학적 기능이 완결된 것과도 무관하지 않다. 21세기 한국소설과 문학비평, 문학(화)연구는 그 각각의 차별성과 고유성에도 불구하고 정확히 상동적이다. 그들이 공히 제도에의 종속을 대가로 치르면서 '기원'으로서의 4.19와 결별을 고한다는 점에서도 그렇다. 그렇게 보면 겉으로 각기 독립된 것으로 보이는 그 세 영역은 실은 서로가 서로를 반사하면서 하나의 삼항조(triad)를 이루고 있다고까지 말할 수 있을 것이다. 그러나 뒤집어 말한다면, 바로 이것이야말로 근대문학의 끝을 재촉한 저개발 근대의 종식과 보다 철저한 근대로의 진입이라는 최종심급에서 기인한 구조적, 필연적인 결과다. 각기 형태는 조금씩 다를지 몰라도 현재의 문학창작과 문학비평, 문학(화)연구의 포지션과 상황은 크게는 한 세기를 풍미했던 한국근대문학이 끝났음을 보여주는, 어떤 의미에서는 불가피한 집단적 증상이다. The effect of 4.19 as an origin which had been dominate the mentals structure of Korean literature runs out of actual effect. There is to say, as 'modern literature' which had been developed conflicting and conspiring with modernity of Korean society is at an end, the historical and literal function of 4.19 is completed. The situation of critics and studies of Korean literature is involved with this end. Korean literature, critics, and literary(cultural) studies in the twenty-first century are homonomous despite their differences. Because they break with 4.19 as an origin paying a price of subordination to the system equally. In this perspective, that three sphere which seem to independent separately are forming an triad as reflecting each other. But precisely this is a structural and inevitable result come from the end of the underdeveloped modern and entry into more complete modern as the last instance over the left. Though their forms may seem different, the position and situation of Literaty writings, critic, and literary(cultural) studies today is inevitable symptom which show the end of Korean modern literature.