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WWW에서 기존의 단독 CAI 재사용을 위한 통합 교육 시스템
강승문(M. Kang),안치돈(C. D. Ahn),백명석(M. S. Baek),왕창종(C. J. Wang),이세훈(S. H. Lee),윤경섭(K. S. Yoon) 한국정보과학회 1996 한국정보과학회 학술발표논문집 Vol.23 No.1A
현재 World-Wide Web(WWW)을 교육 분야에 적용하기 위한 연구들이 한창 진행되고 있다. 그러나 대부분의 연구들은 기존의 코스웨어를 재활용하기 보다는 분산 환경에 맞도록 새로운 코스웨어를 구성하는데 중점을 두고 있으며, 이는 새로운 코스웨어를 개발하기 위해 다시 비용과 노력을 들여야 한다는 문제를 안고 있다. 따라서 본 논문에서는 분산 하이퍼미디어 환경인 WWW과 기존의 독립적인(standalone) CAI(Computer Aided Instruction) 코스웨어를 통합한 시스템을 제안한다. 본 논문의 통합 시스템은 서버 측에 C 언어 교육용 CAI 시스템과 클라이언트 측에 코스웨어를 프리젠테이션하기 위한 실행기로 구성된 WWW의 클라이언트/서버 구조를 확장하였다. 시스템은 WWW상에서 구현되고 있으므로 범용 프로토콜과 브라우져를 통해 액세스가 가능하다. 또한 서버 측의 학습자 관리기와 노드 관리기는 각각의 학습자에게 알맞은 개별 교육과 방향성 상실을 막기 위한 방법을 제공한다. 본 시스템 구조는 클라이언트 측의 실행 모듈만을 변경함으로써 독립적인 CAI 코스웨어를 WWW을 통해 프리젠테이션할 수 있도록 설계되었으므로 코스웨어를 개발하는데 드는 비용과 노력을 절감할 수 있는 장점이 있다. 또한, 기존의 독립적인 코스웨어를 재사용할 수 있는 기반을 제공한다. 현재 본 논문의 구조를 이용하여 전세계에 걸쳐 존재하는 수많은 멀티미디어 자료들을 재활용하여 코스웨어를 저작할 수 있도록 확장하기 위한 연구가 진행되고 있다.
산업용 냉각기의 용량제어 방식별 에너지 소비 변화 특성
백승문(S. M. Baek),문춘근(C. G. Moon),이동훈(D. H. Lee),곽진우(J. W. Kwag),김은필(E. Kim),윤정인(J. I. Yoon) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.10
This paper presents the characteristics of energy consumption change by capacity control type of industrial water cooler. Industrial water cooling capacity control compare the overall energy consumption. Hot-gas bypass capacity control system and inverter type system of change in control of the capacity factor by comparing the performance of the overall system is to compare the energy consumption. Hot-gas bypass system for capacity control by controlling the coefficient of performance from 0.52 to 2.81 and showed a change in inverter type capacity control according to the change in coefficient of performance was between 2.17 to 2.64.
백승문(S. M. Baek),김현우(H. W. Kim),곽진우(J. W. Kwag),문춘근(C. G. Moon),정석권(S. K. Jeong),윤정인(J. I. Yoon) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
This paper presents the characteristics of seasonal capacity control of variable speed water cooler. The experiment is set to find the degree of superheat obtaining the optimum cooling capacity, with the electronic expansion valve controlled by the variation of compressor speed maintaining the constant degree of superheat at the evaporator outlet. It is a preliminary study on the optimum control of the water cooler system using a variable speed compressor controlled by inverter. It is investigated that the distribution of high and low pressures on a system is checked with variation of electronic expansion valve open/close degree and outdoor temperature.
백승문(S. M. Baek ),설원실(W. S. Seol ),이호생(H. S. Lee ),윤정인 (J. I. Yoon ) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.6
The heat transfer performance of plate heat exchanger decreases as time goes by. The main reason for this phenomenon causes by the fouling on plate of heat exchanger. To remove the fouling, we have usually cleaned the plate of heat exchanger using chemicals or polishing by brush or cloth with hand after stopping the equipment and disassembling heat exchanger. But, to clean the plate using this method, the equipment needs to be stopped and disjointed heat exchanger. And we need to re-joint after cleaning. Especially, the concern of environmental pollution happens in case of using chemicals. Therefore, we need to develop automatic fouling removal equipment which can keep high heat transfer efficiency continuously and solve the problem of environmental pollution. So, in this paper, we developed and tested the equipment which can clean the fouling on plate heat exchanger automatically per constant period and interval using air bubble. The total heat transfer coefficient decreased with slower tendency on occasion of using air bubble than that of the existing method. Also, it was revealed that the variation of total heat transfer coefficient was affected by water velocity.
오승택(S. T. Oh),이호생(H. S. Lee),백승문(S. M. Baek),윤정인(J. I. Yoon) 한국동력기계공학회 2008 한국동력기계공학회 학술대회 논문집 Vol.2008 No.11
In this study, as a step or preparation planning new cycles of liquified natural gas, characteristics of existing natural gas liquefaction cycles were analyzed. Cascade process, DMR and C3MR are typical liquefaction cycles today. Cascade process is the process of cascade refrigeration using three pure refrigerants (propane, ethane, methane), DMR is the process of refrigeration using dual mixed refrigerant cycles and C3MR is the process of refrigeration using mixed refrigerant cycle with precooler using propane. We are planning to develop the new natural gas liquefaction cycle through analysis of typical liquefaction cycles with Hysys software
플레이트 열교환기의 공기방울에 의한 파울링 제거 및 용존산소 제거 효과
오태산(T. S. Oh),백승문(S. M. Baek),설원실(W. S. Seol),이호생(H. S. Lee),김현주(H. J. Kim),윤정인(J. I. Yoon) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.10
This paper presents an effect of air bubbles in a plate heat exchanger on fouling & dissolved oxygen removal. Fouling is the deposit that disturbs heat transfer on the heat exchanger surface. As a result the heat transfer performance of heat exchanger plate decreases as time goes by. It has developed and tested the equipment which can clean the fouling on heat exchanger plates automatically per constant period and interval using air bubbles. Value of dissolved oxygen showed lower more than 11% when using both an air separator and dissolved oxygen eliminator compared to using only an air separator.
곽진우(J. W. Kwag),백승문(S. M. Baek),정영권(Y. K. Jung),이곤재(G. J. Lee),윤정인(J. I. Yoon) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.10
This paper presents the prevention of frying oil rancidity by using a refrigerator. Fries in a hot frying process is done automatically by the reaction of oxygen in the air and heat degradation occurs by oxidation, heating, combined heat and oxidative polymerization occurs, and Fries will cause the loss of nutrition. This development technique using freezer on the bottom of the fryer, a couple of layers of water oxidation, won who is the main byproduct of the removal and allows the removal of trans fat. And frying oil for a long time to clean the aim is to enable. Frying oil frequent replacement due to oil rancidity, reducing the effective cost savings generated during and after use frying oil pollution of the environment is intended to reduce the problem.