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- 저자 : 이창훈(Chang-Hun Lee) (검색결과 416 건)
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거칠기 돌기의 상호작용을 고려한 미세입자의 응착특성에 관한 연구
이창훈,이경훈,윤준호,신영의,Lee, Chang-Hun,Lee, Kyong-Hun,Yoon, Jun-Ho,Shin, Young-Eui 대한용접접합학회 2008 대한용접·접합학회지 Vol.26 No.1
In this paper, elastic and plastic adhesion index was very important in deciding adhesive characteristics and varying elastic and plastic index, dimensionless load and pull-off force were analyzed and simulated. Finally, using AFM, experimental surface roughness parameters of substrates and pull-off force between tip and substrates were produced. Using these values, pull-off forces were calculated and were compared with experimental pull-off forces. Through simulation and experiment, it was found that interaction of asperity also had very important influence on adhesive contact.
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이창훈,이동욱,이용수,손정현,김광석,유완석,Lee, Chang Hun,Lee, Dong Wook,Lee, Yong Su,Sohn, Jeong Hyun,Kim, Kwang Suk,Yoo, Wan Suk 대한기계학회 2013 대한기계학회논문집 Vol.37 No.3
차량의 제동시 쏠림 현상은 크게 타이어에 의한 원인과 현가시스템, 조향시스템 등의 차량구조의 이유로 발생한다. 그 중 차량구조의 원인은 드래그링크 방식의 조향시스템과 판스프링 형태의 현가 스프링 때문으로 볼 수 있다. 본 연구에서는 차량동역학 해석 프로그램인 ADAMS/CAR 를 사용하여 제동시 쏠림의 발생 원인에 대해 분석하였다. 제동시 드래그링크와 판스프링의 거동을 확인하고 그로 인해 발생하는 쏠림을 최소화 시키기 위해 최적화 프로그램인 Visual DOC 를 사용하여 쏠림을 감소시키기 위한 조향 연결점의 위치를 결정하였다. 설계 변경된 차량의 K&C (Kinematic & Compliance) Test 시뮬레이션을 통해서 다른 특성에 미치는 영향이 없음을 보였고, 전차량 제동시뮬레이션을 통해 제동시 쏠림이 감소함을 확인하였다. The tires, suspension type, and steering system can all cause pulling during braking. Among these, a drag link steering system and leaf-type suspension system are significant causes of vehicle pulling. In this study, the pulling problem is analyzed using the vehicle analysis program "ADAMS/CAR." The drag link and leaf spring behavior is analyzed to find the key reason for pulling. After this, the optimization program "Visual DOC" is used with "ADAMS/CAR" to find a steering link connection point to reduce pulling. After conducting this simulation, K&C (kinematic & compliance) test simulation with a modified connection point is conducted to determine whether the vehicle performance improves. Through a full braking simulation, it is verified that the pulling distance is reduced at braking.
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퍼지제어에 의한 전동 휠 체어의 경로속도 보정에 관한 연구
이창훈,문철홍,홍승홍,Lee, Chang-Hun,Mun, Cheol-Hong,Hong, Seung-Hong 대한의용생체공학회 1992 의공학회지 Vol.13 No.4
In this study, Fuzzy control algorithm to generate a change of rocomotion condition according to an outer environment is introduced on a motorized wheelchair control. An optimal control rule for conquesting the less of safety and system Inefficiency in the past are given to this motorized wheelchair. And dynamic analysis Is also adopted to it. Using those rules, a proportional control was possible when the vehicle changed Its moving direction. The proposed method which considers the relationship between a moving velocity and the command from the joystick shows better performance in the change of moving direction.
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이창훈,이원호,Lee, Chang-Hun,Lee, Won-Ho 한국전통조경학회 2017 한국전통조경학회지 Vol.35 No.1
The present study is designed to examine categories and characteristics of the scenic sites depicted in the "Joseon MyungSeung SiSun(Collection of Poems on Joseon Dynasty Scenic Sites, 朝鮮名勝詩選)" written by Narushima Sakimura(成島鷺村) during the early period of the Japanese Colonization to introduce the scenic sites of the Korean Peninsula. Introduction and forewords are construed in order to define the purpose of the Collection, and thorough analysis are conducted on category, location, and distinct characteristics of approximately 1,700 scenic sites described in the body. From the study, it is identified that there are twice as many cultural landscapes introduced in the Collection than natural landscapes, and the most frequently introduced sites are historical Buddhist sites, pavilions, famous mountain in the respective order. Further, the study reveals that the Collection makes reference of the verses written by virtuous Korean scholars in order to broaden the significance of the scenic sites, and also that the Collection marks the time period when the new scenic sites with symbolic implications of the modern period at the turn of the Japanese colonial period are began to be introduced. Such new scenic sites include modern parks and commemorative structures, beaches, train stations, etc. Nevertheless, the scope of study presents limitation as its scope of analysis does not take the changing perceptions of people on scenic sites before and after the colonial period into consideration, and also further comparative analysis on other documentations made record on the scenic sites of the Korean Peninsula will need to be continued in the future studies.
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류마티스 관절염 환자에서 발생한 연합건의 석회성 건염 - 증례보고 -
이창훈,김성재,이승훈,구민회,이봉근,Lee, Chang-Hun,Kim, Sung-Jae,Lee, Seung-Hun,Koo, Min-Hoi,Lee, Bong-Gun 대한정형외과초음파학회 2012 대한정형외과 초음파학회지 Vol.5 No.1
Calcific tendinitis usually occurs within the area where tendon inserts to bone. In the shoulder joints, most cases occur within the supraspinatus tendon just proximal to the greater tuberosity. We report a rare case of calcific tendinitis occurred within the conjoined tendon of coracobrachialis and short head of biceps brachii in a patient with rheumatoid arthritis, diagnosed by means of ultrasonographic evaluation.
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