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전원석,신원호,양태영,김원구,윤대희,Jun, Won-Suk,Shin, Won-Ho,Yang, Tae-Young,Kim, Weon-Goo,Youn, Dae-Hee 한국음향학회 1997 韓國音響學會誌 Vol.16 No.4
본 논문에서는 다양한 전화선 채널에서 수집된 한국통신(KT)의 데이터베이스를 이용하여 인식 시스템의 성능을 향상시키기 위한 효율적인 특징벡터 및 전처리방법을 연구하였다. 먼저 잡음 및 주변 환경 변화에 강인한 갓으로 알려져 있는 특징벡터들을 이용한 인식 성능을 비교하고, 가중 켑스트랄 거리측정 방법을 이용하여 인식시스템의 성능 향상을 검증하였다. 실험 결과, KT의 인식 시스템에서 이용하는 LPC 켑스트럼의 경우에 비하여 PLP(Perceptual Linear Prediction)과 MFCC)Mel Frequency Cepstral Coefficient)등에 대하여 인식률이 향상되었다. 켑스트럼간의 거리측정에 있어서는 RPS(Root Power Sums)와 BPL(Band Pass Lifter)과 같은 가중 켑스트랄 거리측정 함수들이 인식성능 향상에 도움을 주었다. 스펙트럼 차감법(Spectral Subtraction)의 적용은 왜곡에 의한 효과가 커서 인식률이 저하되었지만, RASTA(RelAtive SpecTrAl) 처리방법, CMS(Cepstral Mean Subtraction), SBR(Signal Bias Removal)의 적용시에는 인식 성능 향상을 보였다. 특히, CMS 방법은 간편하면서도 높은 인식 성능 향상을 보였다. 마지막으로, CMS의 실시간 구현을 위한 방법들의 인식 성능을 비교하고, 인식 성능 저하를 막기 위한 개선책을 제시하였다. In this paper, we study the efficient feature vector extraction method and front-end processing to improve the performance of the speech recognition system using KT(Korea Telecommunication) database collected through various telephone channels. First of all, we compare the recognition performances of the feature vectors known to be robust to noise and environmental variation and verify the performance enhancement of the recognition system using weighted cepstral distance measure methods. The experiment result shows that the recognition rate is increasedby using both PLP(Perceptual Linear Prediction) and MFCC(Mel Frequency Cepstral Coefficient) in comparison with LPC cepstrum used in KT recognition system. In cepstral distance measure, the weighted cepstral distance measure functions such as RPS(Root Power Sums) and BPL(Band-Pass Lifter) help the recognition enhancement. The application of the spectral subtraction method decrease the recognition rate because of the effect of distortion. However, RASTA(RelAtive SpecTrAl) processing, CMS(Cepstral Mean Subtraction) and SBR(Signal Bias Removal) enhance the recognition performance. Especially, the CMS method is simple but shows high recognition enhancement. Finally, the performances of the modified methods for the real-time implementation of CMS are compared and the improved method is suggested to prevent the performance degradation.
광섬유 센서를 이용한 경량전철 교량에 대한 동적응답 모니터링
전원석(Chung Wonseok),강동훈(Kang Donghoon),여인호(Yeo Inho),이준석(Lee Jun S) 한국구조물진단유지관리학회 2006 한국구조물진단학회 학술발표회논문집 Vol.10 No.2
Among many types of light rail transits (LRT), the rubber-tired automated guide-way transit (AGT) is prevalent in many countries due to its advantages such as good acceleration/deceleration performance, high climb capacity, and reduction of noise and vibration. However, AGT is generally powered by high-voltage electric power feeding system and it can cause electromagnetic interference (EMI) to measurement sensors for structural monitoring of railway structures such as bridges, tunnels and etc. The fiber optic sensor system is free from EMI and has been successfully applied in many applications of civil engineering. Especially, fiber Bragg grating (FBG) sensors are the most widely used because of its good multiplexing capabilities. This paper investigates a prestressed concrete girder railroad bridge using FBG based sensors to monitor the dynamic response of the bridge with a test train which passes over the bridge at different speeds ranging from 10㎞/h to 50㎞/h. The results show that the measured data from FBG based sensors are free from EMI though electric sensors are not, especially in the case of electric strain gage. It is crucial in the health monitoring of structures including high voltage power feeding system.
김대철(Daechul Kim),조의찬(Euichan Cho),전원석(Wonseok Jun),백승현(Seunghyun Back),김용태(Yongtae Kim) 한국자동차공학회 2017 한국자동차공학회 부문종합 학술대회 Vol.2017 No.5
A new point of view in door belt molding is variable shape, which is a new method based on press or mold and extrusion. This paper aims to make 1-piece belt molding with variable shape which has small angle of corner unless any other problems of glass moving ability for C project car.
박완수(Wansu Park),조의찬(Eui Chan Cho),전원석(Won Seok Jun),홍은표(Eun Pyo Hong),조한신(Han Shin Cho),이명렬(Myoung Ryoul Lee),최은호(Eun Ho Choi) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
A new point of view in interior trim is weight reduction. We developed a new door trim material to reduce the gravity. A Light wood-fiber material can reduce the weight( 40 % ↓) with 1.1~1.2T (down from 2.5T). But we should modify the stiffness for structure. First of all, we consider which structure is the best for quality/cost and weight. We analyze the structure for noise and stiffness. Whats more, optimize the process and reduce the increased cost.
동특성을 고려한 도어 인너판넬 강건구조 및 시험법 연구
이종원(Lee, Jong Won),조의찬(Jo, Eui Chan),전원석(Jun, Won Suk),조경호(Cho, Kyoung Ho),최기현(Choi, Ki Hyun),변민형(Byun, Min Hyung) 한국자동차공학회 2017 한국자동차공학회 학술대회 및 전시회 Vol.2017 No.11
Many kind of vibration can be delivered to user as a type of noise which is caused by external factor or vibration of automobile parts itself. And those noises can be amplified when forced frequency and natural frequency matched. We call this phenomenon “Resonance” and this is an important phenomenon that we have to escape or make it smaller. To reduce vibration and noise, escaping match of frequency has a limit because of many reasons. In this study, we are going to focus on how to make the amplified noise smaller. So far, during development of car, what we measure to know stiffness of door inner panel is static stiffness only. But static stiffness can’t represent vibration characteristic of door inner panel. So we need to add the concept of dynamic stiffness into development process to reduce noise. To find optimal design method which can make noise smaller we did modal test and analysis.