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김준우(J.W. Kim),이남도(N.D. Lee),김종구(J.G. Kim) 한국해양환경·에너지학회 2004 한국해양환경공학회 학술대회논문집 Vol.2004 No.-
This study was conducted to evaluate water quality in coastal sea of Kunsan using multivariate analysis. The analysis data in Coastal Sea of Kunsan use of surveyed data by the NFRDI from April 2000 to November 2002. Twelve water quality parameter were determined on each sample. The results was summarized as follow, water quality in coastal sea of Kunsan could be explained up to 62.782% by four factors which were included in loading of nitrate-nutrients by pattern 24.688%, suspended solids pattern (12.180%) seasonal climate variation pattern 18.367%, phytoplankton limite factor DIP pattern (10.546%). Principal component analysis of spatial was division five factor. And principel component analysis of year was division four factor. The result of time series analysis by factor score, st. 2 was the most affected by nitrate-nutrient and suspended solids in coastal sea of kunsan. Because st. 2 is closed to the keum river esturary. It could be suggested from these results that it is important to reduce the pollution loads from Kuem river for the control of the water quality in coastal sea of Kunsan.
김준우(J.W. Kim),최균(K. Choi),이종흔(J.H. Lee) 한국전산유체공학회 2013 한국전산유체공학회 학술대회논문집 Vol.2013 No.5
Recently, the rapid development of the semiconductor industry induces the prompt technical progress in the area of the integration of devices and the usage of large diameter wafers for the price competitiveness. As a result of the usage of large wafers in the semiconductor industry, the silicon carbide components which have layers of silicon carbide on graphite or RBSC substrates is getting widely used due to the advantages of SiC such as high hardness and strength, chemical and ionic resistant to all the environments superior than other ceramic materials. For the uniform and homogeneous deposition of silicon carbide on these huge components, it needs to know about the gas flow in the CVD reactor, not only for the delicate adjustment of the process variables but more essentially for the cost reduction for the shape change of specimens and their holders on the stage of reactor. In this research, the CFD simulation is challenged for the prediction of the inner distribution of the gas velocity. Chemical reaction simulation is used to predict the distribution of concentration of the reacting gas with the rotating velocity of the stage. With the increase of the rotating speed, more uniform distribution of the reacting gas on the surface of the stage was obtained.
김준우(J.-W. Kim),한윤수(Y.-S. Han),최균(K. Choi),이종흔(J.H. Lee) 한국전산유체공학회 2013 한국전산유체공학회지 Vol.18 No.3
Recently, the rapid development of the semiconductor industry induces the prompt technical progress in the area of device integration and the application of large diameter wafers for the price competitiveness. As a result of the usage of large wafers in the semiconductor industry, the silicon carbide components which have layers of silicon carbide on graphite or RBSC substrates is getting widely used due to the advantages of SiC such as high hardness and strength, chemical and ionic resistant to all the environments superior than other ceramic materials. For the uniform and homogeneous deposition of silicon carbide on these huge components, it needs to know about the gas flow in the CVD reactor, not only for the delicate adjustment of the process variables but more essentially for the cost reduction for the shape change of specimens and their holders on the stage of reactor. In this research, the CFD simulation is challenged for the prediction of the inner distribution of the gas velocity. Chemical reaction simulation is used to predict the distribution of concentration of the reacting gas with the rotating velocity of the stage. With the increase of the rotating speed, more uniform distribution of the reacting gas on the surface of the stage was obtained.
다차원스펙트럼 해석법을 이용한 엔진방사소음 규명에 관한 연구
오재응(J.E.Oh),백문열(M.Y.Beck),김준우(J.W.Kim),김진동(J.D.Kim) 한국자동차공학회 1993 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
With the advance of the standard of living, the demand on automobile goes beyond the simple transportation equipment. therefore the interior noise reduction has been the important factor for improvement of ride quility. Noise during idling is transmitted by the vibration of engine mount is a major vehicle characteristic determining occupant comfort In the present research two approaches for noise source identification based on theory for multiiple-input system have been investigated. The concepts of the frequency response function and the multi-dimensional spectral analysis were used to estimated the spectra of the noise source that were accounted for in the multiple-input model.<br/>
4세대 이동통신 핵심기술 WiBro Evolution 시스템 개발
박윤옥,최정필,김준우,방승재,안지환,Park, Y.O.,Choi, J.P.,Kim, J.W.,Bahng, S.J.,Ahn, J.H. 한국전자통신연구원 2009 전자통신동향분석 Vol.24 No.3
2010년경 에 확정될 4세대 이동통신 표준인 ITU-R의 IMT-Advanced 표준을 대비하여 기 개발된 WiBro의 고도화 작업이 필요하다. 본 고에서는 2006년부터 2008년까지 한국전자통신연구원과 삼성전자가 공동 연구로 진행한 WiBro Evolution 시스템에 대하여 기술한다. WiBro Evolution 시스템의 기술적인 특징들을 살펴보고 WiBro Evolution 단말 관점에서의 구현에 대해 기술한다.