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최윤정,한운섭,최경규 이화여자대학교 의과대학 2003 EMJ (Ewha medical journal) Vol.26 No.2
연구목적 : 본 연구는 비선형 동역학 이론을 이용하여 뇌파를 시공간적으로 분석해 내고 이를 지능형 시스템에 도입함으로써 새로운 진단시스템을 개발하는 것을 목적으로 한다. 방법: 최대 64 채널가지의 모든 뇌파에 대해 적용이 가능한 시스템을 구성하여 가장 기본적인 형태의 뇌파 샘플을 적용, 측정된 뇌파를 불러오고 전처리 과정을 통해 신호를 분석에 용이하게 가공하고 분석법의 특성에 따라 알맞은 분석법을 선택하여 분석하고 분석된 데이터는 후처리과정을 통해 그 패턴을 분류하는 단계의 프로그램을 만들고 비선형 동역학 이론을 이용하여 단계별 프로그램을 구성하였다. 결과: 컴퓨터 시스템에 사용하는 프로그램을 다음과 같은 다양한 요소로 구성하였다. 신호 발생부에는 Lorenz sys-tem과 Rossler system을 포함하였다. 신호 전처리 부에는 정량화, 밴드 패스 필터링, 잡음 추가, 미분, sutto-gating 과정을 포함하였다. 신호 분석 부에는 스펙트럼분석, 위상공간 분석, 상관 분석, 모드 분석을 포함하였다. 신호 후처리 부에는 setting layer, Learning procce-ssing and Making weight file, Classifier start with Test file을 포함하였다. 부가기능으로서 Copy&paste, Print, Save 기능을 포함하였고 운영 환경은 Windows 95/98/2000 또는 Windows NT를 사용하고 데이터 형식은 뇌파 채널 최대 64채널까지 가능(Neural Network Processing의 경우 8채널) 하며 아스키 파일로 열(co-lumn)의 수는 채널을 의미하고 행(row)은 샘플링되어 저장된 데이터를 의미하는 것으로 하였다. 결론: 뇌에서 발생하는 전기학적 신호를 실시간으로 손쉽게 분석하여 실제 진단에 이용할 수 있는 기본적인 컴퓨터 프로그램을 개발하였으며 이를 토대로 더욱 정교하고 객관적인 뇌파 분석 결과를 얻을 수 있는 상용 프로그램의 개발에 이용할 수 있을 것으로 생각한다. Objectives : EEG is a record of electronic signals of brain. If there are effective methods for analysis of EEG signal it can be used as a diagnostic tool for diseases related to brain function. We developed a new a basic computer program which was designed to analysis of pattern of EEG. For nalysis of pattern, EEG signal was processed by variable experimental analytical methods and grouped by common pattern. Results : Program was composed of multiple systems. Signal generating system was composed of Lorenz signal generation and Rossler signal generation parts. EEG processing system was com-posed of Normalization, Band pass filtering, First Second difference, Add random noise and Sur-rogate making parts. EEG analyses system was composed of Spectral analyses, Phase space analyses, Correlation analyses and Mode analyses parts. Pattern recognition and grouping system was com-posed of data format, Power spectrum, Neural network process and Classification parts. Conclusion : We developed a basic computer program for systemic analysis of EEG by Nonlinear analysis methods.
HFC-134a와 대체냉매 HFC-152a에 CF_3I를 혼합한 자동차냉매 특성
권일욱,박찬수,홍경한,문기선,최운수,서의경,윤갑식,이종인,하옥남 朝鮮大學校 機械技術硏究所 2002 機械技術硏究 Vol.5 No.1
These days, an attention of environment has been increasing all over the world. to prevent the green house effect and destruction of an ozone layer, an ozone destruction potential(ODP) be zero and a refrigerant for low global warming potential(GWP) is needed. HFC-134a, in which hydrogen is mixed instead of chlorine is a refrigerant used for automobile conditioners and its destruction potential is ecologically zero. However, it is not considered as a perfect substitutive refrigerant as its GWP is high. It is studied refrigerant mixtures in which HFC-134a, HFC-152a and CF_3I with low GWP and zero ODP are mixed by experimentally and concluded as follows; 1. with the variation of speed of compressor outside temperature and flow rate, the heat of evaporator and compressor and coefficient of performance was varied, and influenced the air conditioner. 2. The pressure of evaporator was decreased with increasing the speed of compressor and that of the refrigerant HFC-134a was higher 21% than that of azotrope refrigerant mixed with CF_3I. The overall capacity of condensor and evaporator was increased and HGC-134a was higher than azotrope refrigerant mixed with CF_3I 3. The capacity of evaporator with the refrigerant HFC-134a was higher 6% than azotrope refrigerant mixed with CF31 and the required power with zaotrope refrigerant mixed with CF_3I was higher 11% than that of HFC-134a. 4. The COP of the refrigerant FHC-134a was higher 31% in 1000RPM. when outside temperature was increased, COP was decreased. 5. Performance of HFC-134a is better than azotrope refrigerant mixed with CF_3I but prefered zaotrope refrigerant mixed with CF_3I considering the environment.
열처리 상태가 10Cr-1Mo-VNbN 주강의 기계적 성질 및 용접성에 미치는 영향
손대영,방국수,이경운,지병하 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.11
Mechanical properties and weldability such as HAZ hardness, cold cracking susceptibility and hot ductility of two differently heat treated 10Cr-1Mo-VNbN cast steels were measured and compared. Because of high hardenability of the cast steel, as-annealed cast steel showed martensitic microstructure and thus had higher hardness than annealed-normalized-tempered cast steel which had tempered martensite. Because the welding electrode used resulted in a high hardness weld metal, both cast steels showed same weld metal cold cracking susceptibility even though the as-annealed cast steel had higher HAZ hardness than the annealed-normalizedtempered cast steel. Both cast steels had excellent hot ductility in high temperature range, indicating no risk of grain boundary liquation cracking in the HAZ. However, the as-annealed cast steel showed an inferior ductility in the intermediate temperature range of 1000~1150℃ because of larger unrecrystallized grain size.