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축소차수모델(ROM)을 활용한 다중이용건물의 실내 공조 예측
차경환,강경혁,이명성,김주한 대한기계학회 2024 대한기계학회 논문집 C. 기술과 교육 Vol.12 No.2
축소차수모델을 적용하여 다중이용건물을 위한 시뮬레이션 기반 디지털트윈을 구축함으로써, 실시간 해석, 가상 시나리오, 그리고 권장 풍량 예측을 포함하는 시스템 시뮬레이션을 수행하였다. 다중이용건물의 테스트베드로 백화점이 고려되었고, 디지털트윈의 시뮬레이션 정확도는 계측 데이터와 비교하여 8% 이내의 오차 범위에서 검증되었다. 공조 쾌적지표 중 하나인 PPD(예상불만족율)를 기반으로 한 최적 HVAC 풍량 알고리즘을 구현하였고, 쾌적 모드와 준쾌적 모드에 대해 각각 실내 쾌적성과 에너지 절감 기준에 기반한 최적 풍량이 제안되었다. 실시간 시스템 시뮬레이션 결과에 따르면, 현재 테스트베드의 공조 운영은 쾌적한 상태로 유지되는 것이 확인되었다. 한편, 준쾌적 모드에서는 HVAC 풍량이 약 40% 감소할 것으로 예측되어, 에너지 절감 가능성을 확인하였다. A reduced-order model was applied to construct a simulation-based digital twin for a multi-use building. The digital twin includes system simulations for real-time analysis, virtual scenarios, and recommended airflow prediction. A department store was considered as a testbed of the digital twin for multi-use building. The reduced-order model's accuracy was validated, showing an error margin within 8% of the measured data. An optimal HVAC airflow algorithm based on the PPD (Predicted Percentage Dissatisfied) was designed and implemented in the system simulations. For the comfort and semi-comfort modes, optimal airflow recommendations were proposed, based on indoor comfort and energy-saving criteria, respectively. The result of the real-time system simulation of the testbed confirmed that the HVAC operations were maintained in the comfort mode. In the semi-comfort mode, a predicted reduction of approximately 40% in HVAC airflow was observed, indicating potential energy savings.
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.
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 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 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.