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최권희(Choi Kweon-hee),장대성(Chang Dae-sung),김철근(Kim Chul-keun),한동인(Han Dong-in),전영욱(Jeon young-wook) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
Most of the train brakes depends on friction between wheels and tracks. This requires braking force reduced in order not to cause wheel slides since the friction decreases as the train speed increases and consequently results in extension of braking distance. The braking system called "Linear eddy current brake" or simply " Eddy current brake" is a braking system for making a brake independent from friction, which consists in creating electromagnet by coiling around shoes attached to bogies; having the shoes above the tracks approached to the tracks upon acknowledgement of a braking command; and authorizing braking force that is irrelevant to friction through magnetic repulsion between electromagnet attached to the tracks and train set by the use of the electromagnet"s magnet field characteristics. An electromagnetic attraction braking system that consists in pressing pole shoes attached to bogies against the tracks by using electromagnet"s attraction force is called "Electromagnetic track brake" or simply "Track brake". This paper has been prepared in purpose of studying technological tendencies of the eddy current brake and the track brake so that it can be utilized as fundamental data for commissioning Korean high-speed trains with the eddy current brake hereafter.
정재희(Jung Jae-Hee),오형식(Oh Hyeung-Sik),김철근(Kim Chul-Keun) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
After the introduction of revenue service, abnormal wear has been reported on DMRC EMU wheels that have been manufactured and delivered by Rotem. As a part of an investigation of cause, Rotem has carried out the study of propriety between wheel and rail profile. The wheel profile of DMRC EMU is SK-91146. The material and profile of the wheel was presented by DMRC. The Profile of the rail is UIC 60-1:20. This study tested the propriety of three wheel profiles to include, SK-91146, EN 13715-P8 and UIC s1002 between the rail profile UIC 60-1:20.
신극선,유재덕,박철,김철근,이상헌 大韓成形外科學會 1986 Archives of Plastic Surgery Vol.13 No.2
Blepharoptosis is a condition commonly dealt with in the field of plastic surgery, and it not only gives a disagreeable external appearance and impression but also brings much emotional pain and trauma to the patient. According to the latest reports and studies, the various corrective surgical methods that has been in use in the past few years have not given much favorable or satisfactory results especially in the treatment of severe blepharoptosis. Recontly at our Department of Plastic Surgery of Yonsei University College of Medicine, we have attempted frontalis muscle transfer method in severe cases of blepharoptosis in which there were severe weakening of the levator muscle function and for which no other currently available methods gave satisfactory results. We are reporting on our corrective method, follow up results and problems with the review of current related articles.