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전형주,정회범,심재홍 순천대학교 공업기술연구소 1990 工業技術硏究所論文集 Vol.4 No.-
In this study, the methods of the trajectory planning which satisfy the given constraints in the control systems, have the minimum segmenttransition time, and reduce the deviation from straightline path were investigated. The study was carried out in the joint space on the transition motion between two points and on the several segment motion along multiple points. The kinematic model of Rhino XR2 robot was adopted in the simulation for the trajectory planning.
축압축을 받는 CFRP 적층부재의 에너지흡수특성과 파괴모드에 관한 연구
김정호,정회범,전형주 한국산업안전학회 2002 한국안전학회지 Vol.17 No.3
The object of this paper is to investigate collapse characteristics of CF/Epoxy(Carbon Fiber/Epoxy resin)composite tubes on the change of interlaminar number and fiber orientation angle of outer and to evaluate reappearance of collapse characteristics on the change of tension strength of fibers under static and impact axial compression loads. When a CF/Epoxy composite tube is crushed, static/impact energy is consumed by friction between the loading plate and the splayed fronds of the tube, by fracture of the fibers, matrix and their interface. In general, CF/Epoxy tube with 6 interlaminar number(C-type) absorbed more energy than other tubes(A, B, D-types). The maximum collapse load seemed to increase as the interlaminar number of such tubes increases. The collapse mode depended upon orientation angle of outer of CF/Epoxy tubes and loading status(static/impact). Typical collapse modes of CF/Epoxy tubes are wedge collapse mode, splaying collapse mode and fragmentation collapse mode. The wedge collapse mode was shown in case of CF/Epoxy tubes with 0˚ orientation angle of outer under static and impact loadings. The splaying collapse mode was shown in only case of CF/Epoxy tubes with 90˚ orientation angle of outer under static loadings, however in impact tests those were collapsed in fragmentation mode. So that, CF/Epoxy tube with 6 interlaminar number and 90˚ outer orientation angle presented to the optimal collapse characteristics.
생태계 복원사업의 생태,경제 통합체계 동태분석(2) -임진강 참게 복원사업의 확장모형-
정회성 ( Hoi Seong Jeong ),전대욱 ( Dae Uk Jeon ) 한국시스템다이내믹스학회 2006 한국시스템다이내믹스 연구 Vol.7 No.2
This paper deals with the extension of and discussion on the System Dynamics model (Jeong & Jeon, 2005) of river crabs in Korea. The previous model has been elaborated to empirically search for the optimal restoration and harvest rates of crabs in the Imjin River, on the basis of theoretical models of population dynamics in the field of bio-mathematics and environmental economics. In this paper, the authors tries to couple a series of new feedback loops related to density restrictions and cannibalistic behaviors with a stage-structured model of the crab ecosystem, and also to endogenize the parameter of baby crabs` survival that is caused by water quality improvement and income increase. Through these extensions and relaxations, the authors are able to argue about the strategic decision of the optimal rates additional considerations as well as the properties of the integrated system that was not covered in the previous paper.