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김상근(Sanggun Kim),권원옥(Wonok Kwon),김학영(Hakyoung Kim) 대한전자공학회 2017 대한전자공학회 학술대회 Vol.2017 No.6
Convolution Neural Networks(CNN) are very useful in image recognition and detection. However, convolution operation has a large amount of computation, so parallel processing should be applied to improve performance. In this paper, we will propose a suitable location for parallel processing in CNN and show accelerating method for CNN by using FPGA configured by OpenCL.
Signal Integrity of PCI Express System
Wonok Kwon,Sungun Kim,Pyung Choi 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
PCI Express is high-speed point-to-point serial buses in the computer I/O. The high-speed serial interface has different electrical parameters from parallel bus interface to measure signal integrity of system. Loss and Jitter is important electrical parameters in PCI Express system and they can be analyzed by Eye Diagram. This paper deals with analysis and measurement of electrical parameters of PCI Express system.
디젤기관에서 메탄올 보조분사에 의한 연소 및 배출가스 특성에 관한 연구
박원옥(Wonok Park),공태원(Taewon Kong),김진영(Jinyoung Kim),하종률(Jongyul Ha) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
In this paper, the effects of methanol auxiliary injection method for exhaust emission have been<br/> investigated to a direct injection diesel engine. Methanol is oxygenated fuel with large latent heat. As<br/> methanol is supplied, soot concentration is remarkably reduced. But NOx concentration is a little<br/> increased. Soot is decreased according to the increase of methanol injection duration. It is considered<br/> that the primary cause of the increase in the quantity of pre-mixed combustion. The maximum delivery<br/> quantity of methanol is limited to approximately 50% of total fuel delivery due to misfire and<br/> knocking.
고속신호 무결성 분석을 통한 PCI Express Gen3 시스템 설계
권원옥(Wonok Kwon),김영우(Youngwoo Kim) 대한전자공학회 2015 전자공학회논문지 Vol.52 No.4
PCI Express는 고속 차동신호를 사용한 점대점(point-to-point) 프로토콜로 시스템 설계 시 Eye Diagram을 통한 신호의 손실(Loss)과 지터(Jitter) 분석이 필요하다. 특히 PCI Express Gen3 물리 신호는 8Gbps의 고속 직렬신호로 고속신호분석에 의한 시스템 설계가 반드시 요구된다. 본 논문은 PCI Express Gen3 서버 연결망 스위치카드 시스템 제작을 통하여 고속 직렬신호의 토폴로지 추출, 채널분석, 채널의 S-파라미터 추출 및 송수신 버퍼를 포함한 시스템의 신호분석 시뮬레이션을 다룬다. 채널의 손실을 보안하기 위해 수신단 Eye diagram 분석을 통하여 송신 버퍼의 이퀄라이저 파라미터를 조정하여 송신단 최적의 De-emphasis와 Preshoot 파라미터 값을 시뮬레이션을 통하여 찾고 있다. PCI Express is high-speed point-to-point serial protocol, the system is designed by analysing loss and jitter through Eye Diagram. It is necessarily analyzing high speed serial signals when the PCI Express Gen3 which has 8Gbps physical signal speed is designed especially. This paper deals with topology extraction, channel analysis, extraction of s-parameters and system signal integrity simulation within transceiver buffer models through PCI Express Gen3 server connecting switch system design. Optimal parameters of transmitter buffer equalizer are found through solution space simulation of de-emphasis and preshoot parameters to compensate channel loss.