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차경환,김정훈,이용택 한국막학회 2016 멤브레인 Vol.26 No.5
메탄을 순도 95% 이상으로 분리, 회수하기 위하여 메탄에 대한 분리특성이 우수한 폴리설폰 중공사 분리막 모듈 을 2단으로 연결하고 재순환 흐름을 이용하여 회수율을 90% 이상으로 유지할 수 있도록 공정을 설계하였다. 이렇게 설계된 2단 공정을 통한 메탄 분리 거동 특성을 이론적으로 예측하기 위하여 Compaq Visual Fortran 6.6 소프트웨어를 이용하여 수 치 해석하였다. 개발한 프로그램을 사용하여 수치 해석을 수행한 결과 공정 변수에 따라 최종 메탄의 농도 변화에 미치는 영향을 고찰할 수 있었다. 공급 기체 압력과 분리막 길이와 공급측 메탄 농도 증가, 유량이 감소함에 따라 최종 생산물 내 메탄 농도 증가를 관찰할 수 있었으며, 메탄의 회수율은 감소함을 알 수 있었다. A numerical analysis was performed for a separation of carbon dioxide and methane using 2-staged, membrane process where two polysulfone hollow fiber membrane modules were connected to provide both the methane concentration richer than 95% and the recovery higher than 90% using the recycled flows. The Compaq Visual Fortran 6.6 software was utilized for the numerical simulation. Both the methane concentration and the recovery % of methane could be successfully predicted as the function of the operating conditions. As the feed pressure, the methane concentration, and the flow rate increase, the methane concentration in a product is also found to increase and the recovery of methane is found to decrease.
차경환 東西大學校 2001 동서논문집 Vol.7 No.-
In this paper, we implemented the real-time active noise control of system using SISO method. This algorithm could settle the howling problem, which the MIMO system has in general. The SISO system which one microphone can not only input the signal but also observe the error signal was implemented with TMS320C32 DSP Board. Experimental results demonstrate that the noise level was reduced about 80% when the noise level was measured inside closed box after noise source radiated to the closed box.
차경환 東西大學校 2001 동서논문집 Vol.7 No.-
In this paper, we implemented a realtime digital reverberator using feedback type IIR filter and variable index method. This reverberator can reduce the amount of calculation by directly convolution. Also the variable index method can minimize the memory of the reverberant system. So it can represent a various reverberation effect by using recorded room impulse response. The result of reverberator implementation using TMS320C32 DSP Board, we could felt a sense of distance and a space perception in a virtual room.
차경환,Cha, Kyung-Hwan 한국정보통신학회 2009 한국정보통신학회논문지 Vol.13 No.2
기존 사무 환경에서 개인 PC를 이용하여 네트워크를 통해 프린터를 공유하는 경우 프린터와 직접 연결된 PC에 상당한 과부하가 발생한다. 프린터에 직접 연결된 PC 사용자는 개인 작업 시 이러한 과부하로 인해 불편함이 발생하게 된다. 본 논문에서는 이와 같은 문제점을 해결하고, 사무실 구성원들이 네트워크를 통해 원할 한 프린터 작업을 수행할 수 있도록 프린터 서버 역할을 수행 하는 Embedded Linux 기반의 Embedded Printer System을 구현 하였으며, 실제 환경에서 실험을 거쳐 성능을 검증하였다. PC users could experience some inconvenience when they use their PC that was physically connected to network printers shared by other People in the network due to the overload. This paper shows how to resolve this kind of overload problem and established the embedded printer system based on embedded Linux system which performs the printer server in order for any users in the of ice to do printing work more smoothly via current network. It's own capabilities and functions were verified throughout the various tests in practical environment.
Primary Melanoma of the Spinal Cord의 治驗例
車慶煥,孫晋式,李炳孝 中央醫學社 1971 中央醫學 Vol.20 No.2
A case of primary malignant melanoma was reported in 24 years old male soldier. It was verified with the results of an operative and pathological findings that the lesion involved C3 in the spinal canal. The available references were reviewed and this case in found to be extremely rare.