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[학술강연] 플라즈마를 이용한 박용엔진 저온 탈질 설비에 대한 연구
정경열(K.Y.Chung),송영훈(Y.H.Song),동은석(E.S.Dong),이수태(S.T.Lee),김진영(J.H.Kim),류길수(K.S.Rhyu) 한국마린엔지니어링학회 2002 한국마린엔지니어링학회 학술대회 논문집 Vol.2002 No.-
In this paper, we study NH₃ De-NOx SCR (Selective Catalyst Reduction) technology of marine engine for low temperature (below 250 C) exhaust gas.<br/> This technology can remove max 80% NOx in exhaust gas under low gas temperature (below 250C) condition using combined non-thermal Plasma and Ammonia SCR method.<br/>
[학술강연] 전기전도도를 이용한 파울링 진단기술에 관한 연구
정경열(K.Y.Chung),이후락(H.R.Lee),문전수(J.S.Moon),이수태(S.T.Lee),류길수(K.S.Rhyu) 한국마린엔지니어링학회 2002 한국마린엔지니어링학회 학술대회 논문집 Vol.2002 No.-
Fouling causes serious maintenance problems on heat exchanger tubes and process facilities. To avoid such fouling problems, numerous efforts have been tried, e.g., diagnosis of fouling, reducing and eliminating the fouling, etc.. The objective of the present study is to develop an innovative diagnostic system of fouling, which can detect the scaling attached to the wall non-homogeneously. The performance of the diagnostic system has been evaluated with a scaling simulator that generates scaling on tested tube wall. The measured values with the diagnostic system were compared with the amounts of the scaling generated by the simulator.
선박엔진 통합시스템의 실시간 고장진단 기법에 관한 연구
정경열(K.Y.Chung),김달현(D.H.Kim),류길수(K.S.Rhyu) 한국해양대학교 해사산업연구소 1999 海事産業硏究所論文集 Vol.9 No.-
This paper presents the diagnostic method of an integration system where both diagnosis system and monitoring system are combined. Knowledge base for ship engine fault diagnosis is implemented using hybrid knowledge representation technique by EE(Element Expert) shell, and using a certainty-factor method to handle uncertainties of evidences and rules. Whenever alarm occurs, the monitoring system sends alarm data to the diagnosis system. At the same time, the diagnosis system converts alarm data type to diagnosis data type, verifies alarm data, and calculates data's trend. To map alarm data to evidences of knowledge base, the diagnosis system uses two databases. The real-time diagnosis results are provided by a reasoning mechanism implemented using visual C++ for driving OLE automation server of EE shell.
비구면 유리 렌즈 성형용 초경합금(WC) 표면에 이온 빔 보조 마그네트론 스퍼터가 적용된 이리듐-레늄 코팅 박막 특성에 관한 연구
정경서(K. S. Jung),김미선(M. S. Kim),이상원(S. W. Lee),최상경(S. K. Choi),이수경(S. K. Lee) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.10
Iridium-Rhenium(Ir-Re) thin films were deposited onto the tungsten carbide(WC) molding core by ion beam assist sputtering system. The Ir-Re films were prepared by compound-target sputtering with iridium, rhenium and chromium as the sources. Argon were inlet into the chamber to be the plasma and reactive gases. The Ir-Re thin films were prepared with targets having atomic percent of 7:3 and the Ir-Re thin films were formed with about 200 ㎚ thickness. The Ir-Re thin films on tungsten carbide molding core were analyzed by scanning electron microscope(SEM) and surface roughness. Also, adhesion strength and coefficient friction of Ir-Re thin film were examined. The Ir-Re coating technique has been intensive efforts in the field of coating process because the coating technique and process have been their feature, like hardness, high elasticity, abrasion resistance and mechanical stability and also have been applied widely the industrial and biomedical areas. In this report, tungsten carbide(WC) molding core was manufactures using high performance precision machining and the efforts of Ir-Re coating on the surface roughness.
확신도 기법을 적용한 선박엔진 고장진단 전문가시스템 구현에 관한 연구
정경열(K.Y.Chung),최욱현(W.H.Choi),임헌호(H.H.Lim),류길수(K.S.Rhyu) 한국해양대학교 해사산업연구소 1998 海事産業硏究所論文集 Vol.8 No.-
This paper presents the design and implementation of a diagnosis system incorporating with a monitoring system. We classified the ship engine into the sub parts as similarly a experts classification method, acquired the causal relation between measuring data and fault states in consultation with experts, constructed a rule-base using them, and adopted a certainty-factor method in order to handle uncertanties of evidences and rules. When alarms occur, the system infers diagnostic conclusion by using certainty factor obtained from an alarm state (one of 4 levels) and an alarm datum's trend (one of 3 levels), and the certainty factor of a related rule (one of 3 levels).