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성미영(M. Y. Sung),장성룡(S. G. Park),임성근(S. G. Im),김충인(S. Y. Jang),박성균(C. I. Kim) 한국정보과학회 1996 한국정보과학회 학술발표논문집 Vol.23 No.2B
멀티미디어 회의 환경은 분산 환경에서의 공동 작업을 위해 기본적으로 갖추어야 할 환경이다. 본 연구에서는 보통의 Ethernet LAN 상에서 일반적인 개인용 컴퓨터를 사용하여 실시간으로 오디오, 비디오 및 멀티미디어 작업 공간을 공유하는 다자간 멀티미디어 회의 시스템을 구현하였다. 또한 이 시스템의 한 응용으로 구조 편집 지향적 공동 편집기를 설계하고 구현하였다. 이 공동 편집기를 통하여 분산 객체들을 논리 구조로 조합하여 하나의 문서를 만드는 새로운 편집 방식을 제안한다.
김충(C. Kim),김주호(J.H. Kim),천길정(G.J. Cheon),정태형(T.H. Jeong),한동철(D.C. Han) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
Dynamic behavior of planetary gear train for automatic transmission is investigated. Gear meshes are modelled as springs and dampers varying with time. Rolling bearings supporting planet gears are modelled as radial springs. Carrier center locus and dynamic forces acting on gear meshes and supporting bearings are calculated after numerical integration of governing equations. Dynamic behavior is very different from what we know from static analysis. The results show that carrier center locus and shape of forces become simple as rotating speed is increased and that force acting on sun/planet gear mesh is different from force acting on planer/ring gear mesh. Finally, maximun gear mesh load graph can be made out of above result.<br/>
기어의 강성변화를 고려한 유성기어열의 동특성 해석 연구
김충(C. Kim),김주호(J.H. Kim),이정한(J.H. Lee),조영일(Y.I. Cho),천길정(G.J. Cheon),정태형(T.H. Jeong),한동철(D.C. Han) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_1
Dynamic characteristics of planetary gear train (PGT) of vehicle transmission is investigated. Engine torque is transfered by transmission, which is composed of torque converter, cutches and several PGTs. The load from torque converter fluctuate irregularly, so the dynamic force on gear tooth varies nonlinearly. For dynamic analysis, stiffness of gear teeth is calculated according to variation of contact ratio. Static and dynamic model for one stage PGT are suggested, and analyzed by 4th Runge- Kutta method. The results show that the locus of sun gear and dynamic force decrease and the frequency effect of external load is decrease as rotational speed increases.<br/>
이정한(J.H.Lee),천길정(G.J.Cheon),김주호(J.H.Kim),김충(C.Kim),한동철(D.C.Han),명제형(J.H.Myung),정태형(T.H.Jeong) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_1
Gear train system test rig of power circulating type was fabricated, and systematic experiment for measuring quasi-static characteristics of the planetary gear trains has been carried out using the test rig. The measured parameters are fillet strains of the sun gear and ring gear, carrier displacements, torques of the input and output shafts. The results are as follows : i) Even the loading torque is constant, torque variations of the input and output shafts are observed, ii) It has two components of frequency, low frequency of the input shaft rotation frequency and high frequency of the tooth meshing frequency, iii) The variations of the fillet strains of the sun and ring gear have the same tendency as that of the torques, iv) The loci of the carrier is so stable, and have relation with the shaft torque, v) The amplitude of the loci decrease and its shape becomes so simple as rotational speed increases. but this tendency is contrary as with the torque.<br/> <br/>
이정한(J.H.Lee),천길정(G.J.Cheon),김주호(J.H.Kim),김충(C.Kim),한동철(D.C.Han),명제형(J.H.Myung),정태형(T.H.Jeong) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
An experiment for measuring dynamic characteristics of the planetary gear trains has been carried out using a power circulating type test rig. The measured parameters are strains of the planet gear shaft, carrier displacements, as well as the torques of the input and output shafts. Frequency analysis was executed for the carrier displacement