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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,김의진,이순원 성균관대학교 기초과학연구소 1993 論文集 Vol.44 No.2
Zr(acac)Cl_3(THF) 및 Zr(acac)_2Cl_2(acac=acetylactate, CH_3COCHCOCH_3^1) 화합물이 [Li(THF)_x][PhNN=NNPh], Ⅰ, 리간드와 반응하여 각각 Zr(=NPh)(acac)CI(THF), Ⅱ, 및 Zr(=NPh)(acac)_2, Ⅲ, 착화합물을 생성하였다. 이들을 ^1H-NMR, FTIR 스펙트럼으로 분석하였다. Reactions between Zr(acac)CI_3(THF) and Zr(acac)_2Cl_2(acac=CH_3 COCHCOCH_3^1) with [Li(THF)_x][PhNN=NNPh], Ⅰ, led to Zr(=NPh)(acac) Cl(THF), Ⅱ, and Zr(=NPh)(acac)_2, Ⅲ, respectively. They have been characterized by ^1H-NMR and FTIR spectroscopy.
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.
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.
제7차 교육과정에 의한 고등학교 영어 교과서 듣기 활동 분석
차경환,홍서경 中央大學校 韓國敎育問題硏究所 2002 韓國敎育問題硏究所論文集 Vol.- No.17
The purpose of this study is to anlayze listening activities in high school English textbooks and to ascertain whether the results are applicable to the 7th national curriculum aims. Based on the analysis criteria presented by Morley(1991), Richards(1983), and Ur(1984), two different analysis cirteria were applied for an in-depth analysis of the listening activities involved in the textbooks. The results of the analysis show that the philosophy of the 7th national curriculum is properly reflected in some parts of the textbooks. On the other hand, some listening activitis in textbooks are emphasized insufficiently and improperly. Through the results of the study, it is presented that the textbook should be designed and improved for the development of students' listening abilities and their communicative competence with the contents of more various and balanced listening activities.