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Encyclopedia of computer science and technology . 6 ^ Computer selection to curriculum
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Hypertensive Crisis: Believe It and Treat It
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공조설비와 COMPUTER
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전통마을의 문화지속성 평가 -경북 영천 선원리를 대상으로-
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병렬 RISC시스템상에서의 효율적인 데이터 저장기법 ( An Efficient Data Storage Scheme for Parallel RISC Systems )
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Fluid Flow Model of leaky Bucket Scheme with Two Thresholds
- 검색키워드
- 저자 : 정광열(Kwang-Yeil Cheong) (검색결과 4 건)
- 무료
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정광열(Cheong Kwang-Yeil),박태원(Park Tae-Won),전갑진(Jun Kab-Jin),한승용(Han Seung-Young),최지훈(Choi Ji-Hun) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
At present, the trend of high speed train changes from push-pull type to Electric Multiple Unit(EMU) Type. To keep the pace with the change, EMU-Type train has been developed in Korea. The Next Generation High-Speed Rail of EMU-Type is aim to run over 420 ㎞/h. It has lots of power sources in the system, so EMU-Type has advantages in high pulling capacity and accelerating force. But, to apply EMU-Type which is difference from existing Push-pull type, running stability of system needs to be considered. In this paper, Z-link and anti-roll bar composing the railway vehicle are evaluated before developing the full-scale dynamic model for HEMU(High-speed Electric Multiple Unit). The analysis inspects kinematic behavior between car body and bogie. Therefore, the dynamic characteristic of Z-link and anti-roll bar are analyzed, then dynamic model is developed. In the future work, the dynamic model is validated by stability and dynamic analysis applying irregularity.
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정광열(Kwang-Yeil Cheong),박태원(Sung-Pil Jung),정성필(Tae-Won Park),정원선(Won-Sun Chung) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Bolts and nuts are widely used to fasten each mechanical part together in the machines and structures as vital elements. The primary role of bolts and nuts is keeping its axial force against the large external force and vibration. In this study, a lock nut using a spring was developed to maintain axial force. When the lock nut was made, crack occurred in the process of manufacturing the lock nut. Thus, optimized structure of lock nut was found by using the design of experiments. Lastly, the prototype of the optimized lock nut was created, and then the optimization result was verified by comparing results of the initial model and optimized model.
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다물체 동역학 모델을 이용한 종이컵 성형기용 배럴캠의 마모 인자에 관한 연구
전갑진(Kab-Jin Jun),박태원(Tae-Won Park),정광열(Kwang-Yeil Cheong),김영국(Young-Guk Kim) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.3
3 차원 캠의 하나인 배럴캠은 자동화 생산 기계에서 인덱스 드라이브 유닛의 부품으로 많이 사용된다. 캠의 회전축과 종동절의 회전축이 90 도의 위상으로 직교한다. 인덱스 드라이브는 일정한 속도로 회전하는 캠의 입력에 대해 회전하고 정지한다. 터렛이 배럴캠의 회전에 의해 작동하는 동안 종이컵이 매우 빠르고 정확하게 성형된다. 그러나, 배럴캠과 종동절사이의 지속적인 미끄럼 접촉에 의해 점착마모가 발생하며 이러한 마모는 시스템의 성능에 영향을 준다. 결과적으로 제품의 불량율을 증가시킨다. 본 연구에서는 종이컵 성형기에 사용되는 배럴캠의 마모에 영향을 주는 인자가 접촉력임을 확인한다. 배럴캠과 롤러 사이의 접촉력은 다물체 동역학 모델을 이용해 계산한다. 그리고 해석 결과와 실제 시스템의 마모부와 비교를 통해 중요 마모 인자가 접촉력임을 검증한다. The barrel cam, which is a type of cylindrical cam, has been widely used as a part of index drive units for automatic manufacturing machines. The axis of rotation of the barrel cam is orthogonal to the axis of rotation of the follower. The index drive rotates or dwellsdepending on the cam profile, while the cam rotates with a constant velocity. Continuous sliding contact between the barrel cam and the follower surfaces causes wearing of the adhesive between them. This study shows that the contact force between two sliding bodies is responsible for the wear of the barrel cam in the paper-cup-forming machine. This contact force is calculated by using the multibody dynamics model of the paper-cup-forming machine. The analytical result is validated by comparing it to the actual wear spots on the real product.
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차세대 고속철도(HEMU-400X)차량의 안정성 및 동특성 해석
조재익(Cho Jae-Ik),박태원(Park Tae-Won),윤지원(Yoon Ji-Won),정광열(Cheong Kwang-Yeil),김지영(Kim Ji-Young) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
A railway vehicle of the maximum speed of 400km/h is developed in Japan and the railway vehicle of the maximum speed of 350km/h is developed in Germany and France. According to the these tendency of high-speed of the railway vehicle, it is important to predict the dynamic performance of the vehicle. Because the stability and the safety of the vehicle can be confirmed through the prediction of the dynamic performance of the vehicle. In Korea, the next generation high-speed railway vehicle(HEMU-400X) which aims at the maximum speed of the 400km/h is developing. In this study, the model of the next generation high-speed railway vehicle(HEMU-400X) is created using ADAMS/Rail which is a commercial dynamic simulation program. Especially, an anti-roll bar and a Z-Link are modeled considering the effect of the vehicle kinematically. For evaluation of dynamic performance of the vehicle, a critical speed of the vehicle is examined through a stability analysis. Also, a maximum speed of the vehicle is evaluated through a dynamic analysis. These results will be helpful for a basic design of the next generation high-speed railway vehicle(HEMU-400X).
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