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RISS 활용도 분석
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일본/중국/유럽자료
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최신/인기 학술자료
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해외논문구매대행(E-DDS)
http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 김동현(D. H. Kim) (검색결과 285 건) 검색분석정보 보기
- 무료
- 기관 내 무료
- 유료
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저방사화 철강재 의 시험편 크기 변화에 따른 (JLF-1) 파괴저항곡선의 변화
김동현(D.H.Kim),윤한기(H.K.Yoon),이상필(S.P.Lee),A.Kohyama 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
Reduced activation ferritic steel (JLF-1) is considered as a promising candidate material for blanket<br/> or first-wall structure of D-T fusion reactors. The fracture tests of fracture resistance curve (J-R curve)<br/> and JIC are desirable to investigate the exact fracture toughness of JLF-1 steel, since it has a high<br/> ductility. The fracture toughness of JLF-1 steel is affected by the configuration of test specimen such<br/> side groove, specimen thickness or specimen size. In this study, the fracture toughness tests were<br/> performed with various size(plane size and thickness) and various side groove of specimens. The test<br/> results showed the standard specimen with the side groove of 40 % represented a valid fracture<br/> toughness. The fracture resistance curve increased with increasing plane size and decreased with<br/> increasing thickness. However, the fracture resistance curve of half size specimen was similar to that of<br/> the standard specimen.
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최형식(H. S. Choi),김동현(D. H. Kim),강동완(D. W. Kang) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
In this paper, for moving heavy object a new type of human-sized Biped Walking Robot, KUBIR2, driven by the closed-chain type of joint actuator was developed Kubir2 is totally composed of29 degree-of-freedom as head is 4 d.o.f, arms are 12 d.o.f, legs are 12 d.o.fand waist is 1 d.o.f. The weight of the robot is 75(Kg) with 160㎝ tall, but the robot is designed to be capable of supporting 120Kg. The weight of one arm is light enough to be 9kg but capable of delivering 10㎏ load. Linear movement of joint actuators is composed of the four-bar-link mechanism driven by the ball screw which has high strength and high gear ratio. The control system of the robot is developed by using embedded computer and TMS320LF2407 DSP microprocessors. Each joint actuator is controlled by using DSP microprocessors. The communication system between the main controller and joint controllers is developed using the CAN communication system. The performance of the developed robot was validated through walking experiments with supporting 15(㎏) load.
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피칭운동을 고려한 우주발사체 형상의 천음속 비정상 유동해석
김동현(D.H. Kim),김요한(Y.H. Kim),김동환(D.H. Kim),윤세현(S.H. Yoon),김광수(G.S. Kim),장영순(Y.H. Jang),김수현(S.H. Kim) 한국전산유체공학회 2011 한국전산유체공학회지 Vol.16 No.1
In this study, steady and unsteady aerodynamic analyses of a huge rocket configuration have been conducted in a transonic flow region. The launch vehicle structural response are coupled with the transonic flow state transitions at the nose of the payload fairing. Before performing the coupled fluid-structure transonic aeroealstic simulations transonic aerodynamic characteristics are investigated for the pitching motions of the rocket at finite angle-of-attack. An unsteady CFD analysis method with a moving grid technique based on the Reynolds-averaged Navier-Stokes equations with the k-w SST transition turbulence model is applied to accurately predict the transonic loads of the rocket at pitching motion. It is shown that the fluctuating amplitude of the lateral aerodynamic loads imposed on the rocket due to the pitching motion can be significantly increased in the transonic flow region.
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피칭운동을 하는 대형 우주발사체 형상의 천음속 비정상 유동해석
김동현(D. H. Kim),김요한(Y. H. Kim),김동환(D. H. Kim),윤세현(S. H. Yoon),김광수(G. S. Kim),장영순(Y. H. Jang),김수현(S. H. Kim) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.11
In this study, steady and unsteady aerodynamic analyses of a huge rocket configuration have been conducted in the transonic flow region. Launch vehicle structural response can couple with transonic flow state transitions at the nose of payload fairing. Before doing fluid-structure coupled transonic aeroealstic simulations for a huge rocket configuration, transonic aerodynamic characteristics are investigated for pitching motions of the rocket with angle-of attack. Unsteady CFD analysis method with moving grid technique based on Reynolds-averaged Navier-Stokes equations with κ-ω SST transition turbulence model is applied to accurately predict the transonic loads of the rocket with pitching motion. It is importantly shown that the fluctuated amplitude of lateral aerodynamic loads imposed on the rocket due to pitching motion can be significantly increased in the transonic region when the rocket has certain angle-of-attack.
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Development of a 3-D Position Measurement Algorithm using 2-D Image Information
J. H. Lee(이준호),S. H. Jung(정성호),D. H. Kim(김동현) 한국기계가공학회 2013 한국기계가공학회지 Vol.12 No.5
There are several problems in the conventional 2-D image processing and 3-D measurement systems. In the case of the 2-D image processing system, it is not possible to detect elevation data. In a 3-D measurement system, it requires a skillful operator and a lot of time for measuring data. Also, there exist data errors depending on operators. The limitation of detecting elevation data in the 2-D image processing system can be solved by laser diodes. In this study an algorithm that measures the accurate data in a subject face to be detected by combining laser diodes and a commercial CCD camera is developed. In the development process, a planar equation is developed using laser diodes and the equation is used to obtain a normal vector. Based on the results, an algorithm that transforms commercial CCD camera coordinates to 3-D coordinates is proposed. The completed measurement method will be applied to replace a manual measurement system for vehicle bodies and parts by an automated system.
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NDSL
