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Common-rail형 디젤 기관에 초음파 조사 Bio-Diesel유 적용과 EGR율변화에 따른 특성연구
신서용(Seoyong Shin),임석연(Seukyeon Im),정영철(Youngchul Jung),최두석(Dooseuk Choi),류정인(Jeongin Ryu) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Engine performance and exhaust gas emission characteristic of the diesel engine fueled with Bio-Diesel have been studied. Bio diesel fuel was ultrasonically irradiated and supplied by the common-rail fuel delivery system. Various load and engine operating conditions have been experimented. 20% of Bio-Diesel fuel mixed with commercial diesel fuel has been reformed ultrasonically. The exhaust gas recirculation (EGR) effect on the engine performance and emission has been compared with that of the commercial diesel fuel. Among 15%, 20%, and 25% of the EGR conditions, 15% of the EGR condition shows the good engine performance and excellent exhaust gas emission. It is NOx and smoke emissions that can be sharply reduced by adjusting the Bio-Diesel mixing rate and EGR amount according to the specific emission reduction demands. Especially, NOx can be reduced upto 70% by controling the EGR amount.
대용량 광교환기 : ESCIMONET 의 동작, 응용과 성능분석
김정범,신서용 明知大學校 産業技術硏究所 1999 産業技術硏究所論文集 Vol.18 No.-
We describe a new ultra-high capacity time-division and wavelength-division hybrid optical ATM switching system architecture, ESCIMONET. ESCIMONET standards for Easily SCalable Interconnected Multiwavelength optical Network. One of the major characteristics of the proposed switch is that the switch can handle N³channels when the number of wavelength used in system is N. The capacity of the switch is increased by more than N-times compared to that previously reported N ×N high capacity optical ATM switches. This is achieved without increasing the number of wavelength in the system. Multiple wavelength routing technique is used for routing. As the number of channels increases, the rate of the insertion loss increase of the proposed switch is slower than that of previous ones.
비대칭 이중층 셔플넷 구조를 갖는 WDM네트워크의 채널 공유
이승원,신서용 明知大學校 産業技術硏究所 1999 産業技術硏究所論文集 Vol.18 No.-
Multihop lightwave networks are the optical-fiber based local communication systems that use WDM(Wavelength Division Multiplexing) technology to maximally utilize the enormous fiber bandwidth without requiring tunable tranceivers. In this paper, we introduce an asymmetric bilayered ShuffleNet topology, we also discuss channel sharing problem through TDMA and WDMA schemes. Specially, using WDM Cross-Connect, we could minimize the number of channel in asymmetric bilayered ShuffleNet.
김수환,신서용 명지대학교 대학원 1997 대학원논문집 Vol.1 No.-
Polarization control between transmitted optical signal and local oscillator signal in coherent optical communication system is indispensible to recover original baseband signal at the receiver. In this paper, we introduce a newly developed high speed endless polarization controller. It is composed of four liquid crystal phase retarders for endless control. Biasing voltage to each phase retarder is controlled by received optical power according to peak-search algorithm until the power becomes maximum. A newly developed endless polarization control mechanism is also introduced to the controller. We analyzed its performance characteristics by using Poincare sphere and Stoke's parameters and experimentally proved its operation.
파장 분할다중 광 ATM 스위칭 시스템을 위한 새로운 구조의 광 출력 버퍼
송용훈,신서용 明知大學校 産業技術硏究所 1999 産業技術硏究所論文集 Vol.18 No.-
This paper describes a large capacity wavelength-division output buffer for photonic ATM switch. Generally, wavelength-division photonic ATM switches require a WDM output buffer, Several kinds of buffer structure have been proposed. But all of the output buffers so far are limited in terms of control, feasaibility, scalability. The is why we proposed a new structure buffer which can resolve these problems. In this paper, we propose an efficient WDM output buffer based on current technology. The superiority of proposed WDM output buffer over conventional buffers is its simple and optimized structure for large capacity WDM photonic switching system.
김정범,신서용 명지대학교 대학원 1998 대학원논문집 Vol.2 No.-
We describe a new ultra-high capacity time-division and wavelength-division hybrid optical ATM switching system architecture. One of the major characteristics of the proposed switch is that the switch can handle N^3 channels when the number of wavelengths used in the system is N. The capacity of the switch is increased by more than N-times compared to that of previously reported N×N high capacity optical ATM switches. This is achieved without increasing the number of wavelengths in the system. Multiple wavelength routing technique is used for routing. As the number of channels increases, the rate of the insertion loss increase of the proposed switch is slower than that of previous ones.