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박윤기(Yoonki Park),신용태(Yongtae Shin) 한국정보과학회 2011 정보과학회논문지 : 정보통신 Vol.38 No.5
2세대 이동통신 GSM에서 SIM 카드를 모태로 하여, 3세대 이동통신망은 USIM 카드를 사용하고 있다. 세계적으로 Contact-UISM과 Combi-USIM, NFC 카드가 상용화되어 서비스하고 있으며, 현재는 NFC 기반 대용량 HD-USIM 카드 표준이 확정되어 연구 개발 중에 있다. 본 연구에서는 근거리 통신 지원 기술인 Zigbee와 USIM을 융합하기 위한 구현 기법 및 이를 활용한 주요한 서비스모델을 제시하고자 한다. Zigbee 기반 USIM을 구현하여 핸드폰 단말기에서 테스트한 결과 반경 15m 이내에서 서비스가 가능함을 확인하였다. 다만, 실제 서비스 상용화를 위해서는 환경적 요인을 고려하여 구축이 되어야 한다. We have used USIM card in 3G network, advanced from SIM card in GSM. Throughout the world, it has already provided the service of Contact-USIM and Combi-USIM, NFC-USIM and nowadays, the standard of HD-USIM based NFC is settled, therefore it has been developing. On this research, We provide implementation techniques for technology convergence of Zigbee and USIM, Also, We provide Service Model used USIM based on Zigbee. We've got the test result of USIM based on Zigbee built in mobile phone. The communication distance is within 15-meter radius. When we commercialize the real service by USIM based Zigbee, We have to consider the environment of the developed services.
[차량운동성능부문] Tractor-Semitrailer 차량의 제동특성 프로그램 개발
서명원(Myungwon Suh),박윤기(Yoonki Park),권성진(Seongjin Kwon),양승환(Seunghwan Yang),박병철(Byungchul Park) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently safety systems for the commercial vehicle have been rapidly developed. However, we still have many problems in the vehicle stability and the braking performance. Especially, a commercial vehicle may meet a dangerous braking condition when the vehicle is lightly loaded or empty and when the road is wet or slippery. Under these conditions, the truck can spin out or the tractor can jackknife or the trailer can swing out. To design the air brake system for the commercial vehicle, since the air brake system has many design variables, there must have been intensive researches on a method how to prevent dynamic instability and how to maximize the vehicle deceleration.<br/> In this study, mathematical models of the tractor-semitrailer and the air brake system including an ABS controller have been constructed for computer simulation. Also, simple examples are applied to show the usefulness of the program. Designers can use this simulation program for understanding the braking characteristics such as trajectory, braking distance, longitudinal deceleration, lateral deceleration, and yaw rate on various road conditions.