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류권열,안주원,문광석 釜慶大學校 1999 釜慶大學校 論文集 Vol.4 No.1
In this paper, an adaptive acoustic echo canceller based on the wavelet transform filter banks is proposed. The proposed algorithm improves the performance of AEC with a realtime process. The conjugate quadrature filter by Daubechies D4 wavelet is used for proposed wavelet subband filter banks. Adaptive filter coefficients of each subband are updated using LMS algorithm. Subband output signal vectors of adaptive filter are synthesized by synthesis filter banks. The output of adaptive filter is obtained a widband characteristics. As a result of computer simulation using the practical speech signal, the proposed method reduces noise level about l6dB.
류성만,최원영,이미경,이종욱 嶺南大學校 基礎科學硏究所 1992 基礎科學硏究 Vol.12 No.-
저자들은 1992년 9월20일부터 1992년 11월 7일까지 경상북도 경산시 영남대학교 교내에 위치한 삼천지에 대한 곤충상을 조사하였다. 연구 결과 총 8目 56科 121屬 132種이 서식하고 있는 것으로 밝혀졌다. We studied insect fauna in the Samchun-impoundment during the period of from september 20, 1992 to November 7, 1992. The total number of insect taxa are composed of 132 spceies, 121 genera, 56 families, 8 orders including this examination.
고유함수전개법을 이용한 비대칭 유전체 원주공진기의 공진특성해석
류원열,민경호,장중호,전오곤,이창화,최현철 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1
The resonant frequency of the dielectric rod resonator which is surrounded by cylindrical cavity can be calculated very exactly by using eigenfunction expansion method in the concept of electric and magnetic wall from the symmetry. But if the supporter is put in the cavity, the symmetry disappears. Thus this method has some errors. In this paper, the resonant frequency of the asymmetric dielectric rod resonator was calculated by using the eigenfunction expansion method. Also, the effect of the supporter was discussed. Then we found that the resonant frequency was more affected in the case of TM mode than TE or Hybrid modes as the length of the supporter was longer.
유원석,이재응,한재영 중앙대학교 기술과학연구소 1996 기술과학연구소 논문집 Vol.26 No.-
본 연구에서는 변위, 속도, 가속도 등의 진동 응답 신호중에서 어느 신호가 비선형 진동계의 비선형 특성을 잘 규명할 수 있는지에 대해서 연구하였다. 진동 응답 신호는 Runge-Kutta법을 사용하여 발생시켰고, 비선형 진동계는 NARMAX(Nonlinear AutoRegressive Moving Average with eXogenous input) 모델로 표현하였다. NARMAX 모델의 계수 추정은 직교 알고리즘을 사용하였다. 모의실험 결과, 비선형 강성을 갖는 계는 규명할 경우는 변위 신호가 가장 적절하였고, 비선형 감쇠를 갖는 계를 규명할 경우는 속도 신호가 가장 적절하였다. 실제 실험을 통해서 진동계의 규명에 가장 많이 쓰이는 가속도 신호는 비선형 진동계의 특성을 규명하는데는 부적절함을 알 수 있었다. 비선형 강성과 비선형 감쇠를 갖는 계는 변위와 속도 신호를 모두 이용해야 할 것으로 앞으로 많은 연구가 필요하다고 사료된다. In this study, identification problems of nonlinear vibrational system has been addressed, and the ability of the various vibration response(i.e. displacement, velocity, and acceleration) signals to identify the nonlinear characteristics of the system has been investigated. Runge-Kutta method has been used to generate the vibration response signals, NARMAX model used to identify the nonlinear vibration system, and the orthogonal algorithm used to identify the parameters of the NARMAX model. The simulation results show that the stiffness nonlinearity can be well identified by using the displacement signals, and the damping nonlinearity well identified by using the velocity signals. The acceleration signals, which is the most widely used vibration signal in real experiments, could not identify the nonlinear characteristics of the system.
류광열,강원식,김영호,장해동,홍진태,유환수,윤여표 충남대학교 약학대학 의약품개발연구소 1998 藥學論文集 Vol.14 No.-
The purpose of this study was to determine the antioxidative effects of Rhodiola sachalinensis Rhodiola methanol extract was fractionated sequentially with dichloromethane and butanol. Each Rhodiola fraction (water, MeOH, BuOH and CH_2Cl_2 fractions) showed the potent superoxide dismutase (SOD) activity, and had inhibitory effets on peroxide value of linoleic acid (40~57%) and lipid peroxidation (47~70%) in FE^2+/ascorbate system-induced rat liver microsome. Rhodiola methanol extract also recovered carbon tetrachloride-induced decrease in SOD by 42% and catalase activities by 50%, and had inhibitory effects (54%) on carbon tetrachloride-induced lipid peroxidation in rat liver microsome. These results suggest that Rhodiola sachalinensis has the antioxidative effects.
제 7차 교육과정에 따른 국어과 읽기·쓰기 수행평가 연구(Ⅱ)
류성기,곽재용,천경록,이원희 한국초등국어교육학회 2002 한국초등국어교육 Vol.21 No.-
이 연구는 제7차 교육과정에 따른 초등학교 국어과 읽기와 쓰기 수행평가에 대한 것이다. 쓰기는 교과서의 '되돌아보기' 학습 내용의 타당성을 대부분 인정하고, 대신 '되돌아보기' 학습을 하고 난 후의 정확한 평가 기준표를 제시하고 이를 검증해 보는 것에 역점을 두었다. 특히 거시적 관점에서 10단계의 평가 기준표를 제시하여 학생들의 쓰기 수준이 어느 정도까지 이르렀는가를 측정해 볼 수 있게 하였다. 이 연구는 현장 적용이 가능한 국어와 읽기와 쓰기의 수행평가의 방법을 제시해 주었다는 데 큰 의미가 있다. This study is about the performance assessment for reading and writing of Korean Subject in elementary school being on the 7th Korean National Curriculum. The part of writing puts great emphasis on showing an accurate assesment rubric and verifying it after "review pages", instead of accepting mostly the adequacy of learning contents on "review pages", in textbook. Above other things it suggests an assessment rubric of 10 level and can help to measure what level the writing level of students is in. The great meaning of this study is to suggest the method of the performance assessment for the reading and writing of Korean Subject possible to be applied to the schools. It needs to suggest the method of the intergrative performance assessment for speaking, listening, reading, writing, Korean knowledge, and literature as well. But we will study the above-mentioned remark in future.
ASP시스템을 통한 인터넷무역의 경영효율화에 관한 연구
류원우 한국유통정보학회 2003 유통정보학회지 Vol.6 No.2
Internet Trade is drastically changing the classical and conventional international business paradigms. In particular, under the new environments of Information Technology, the ability in utilization of the information technology tool such as the Internet is emerging as an important factor in deciding the competitiveness of export businesses. This paper describes the business efficiency of the Internet Trade under ASP(Application Service Provider) system. ASP service will be the most potential and successful tools in the future, which helps traders and organizations preparing for globalization.