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RISS 인기검색어
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- 저자 : 송문석(Song Mun-Suk) (검색결과 3 건)
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최경진(Choi Kyung-Jin),송문석(Song Mun-Suk),신유정(Shin You-Jung) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
Since the braking system of rolling stock is directly linked to it"s safety, ensuring reliability of braking system and evaluation of performance of it are very important. To develope the performance of braking system, it is required advanced technology and gradually various factors in the field test result This study is designed to analyze various factors about braking force in rolling stock, also, by comparing braking force of KTX with that of high speed train. The study suggests to establish a method of computation of braking force suitable for high speed train having a lot of trouble in calculating braking distance by diversification of patterns of braking system such as the train of speed up and introduction of electric and pneumatic braking system.
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답면 브레이크 슈의 마찰계수와 제동성능향상을 위한 평가기술
최경진(Choi Kyung-Jin),이동형(Lee Dong-Hyung),이회성(Lee hisung),송문석(Song Mun-Suk),신유정(Shin You-Jung) 한국철도학회 2003 한국철도학회 학술발표대회논문집 Vol.- No.-
In tread braking of freight cars, braking force is produced by the friction between the wheel and the braking shoe. Friction coefficients such as the brake power, weight variation and brake shoe types should be sensitively treated as the design parameters. The conditions of the car, empty and weighted, should also be taken into consideration in brake force design and the control of brake force has some limitations in terms of the brake system design so that the brake materials selection should be considered as important measures to solve that difficulties. Friction characteristics of brake materials should remain within the range of maximum and minimum value and the friction performance should remain stable regardless of braking time and temperature. This study presented an experimental evaluation method to secure optimum braking performance by keeping safe braking effect and braking distance by the friction coefficient of the brake shoe of the freight cars.
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등속성 보강 트레이닝시 대퇴부 근력발현 및 최대 근려발휘각의 변화
장용우(Yong Woo Jang),권양기(Yang Ki Kwon),서충진(Chung Jin Seo),고영완(Young Wan Ko),이동욱(Dong Wok Lee),송문석(Mun Suk Song),이채산(Chae San Lee),이광호(Kwang Ho Lee) 한국사회체육학회 2001 한국사회체육학회지 Vol.16 No.-
The purpose of this study was to analyze for changes of thigh strength revelation and peak touqre angle during isokinetic exercise in each angle velocity. Subjects were classify to low velocity exercise(8) and medium velocity exercise(7). They were measured and evaluated to the strength and peak torque angle in each angle velocity by isokinetic exercise during 4 weeks through kin-corn The finding of this study were as follows: 1. Extension strength in each angle velocity show high in the low velocity to L·V·G and medium velocity to M·V·G, but significant increment of strength showed at low velocity 30˚/sec and 90˚/sec(p<.05). Also, flexsion strength showed high in the low velocity to L·V·G and medium velocity to M·V·G, but significant increment of strength showed at low velocity 60˚/sec and medium velocity 150˚/sec, 180˚/sec(p<.05). 2. Peak torque angle at extension showed a significant different at medium velocity 150˚/sec and 180˚/sec between two group in each angle velocity(p<.05). Peak torque angle during exercise duration in each group showed a significant high increment at low velocity 60˚/sec and medium velocity 150˚/sec, 180˚/sec(p<.05). Peak torque angle at extension showed a significant different at all test velocity with the exception of 30 ° /sec, 180 ° /sec between two group in each angle velocity(p<.05, p<.001). Peak torque angle during exercise duration in each group showed a significant high increment at all test velocity with the exception of 60˚/sec(p<.05, p<.01). Within the scope of this study, for the greatest to strength increment during short duration and all range of thigh muscle contraction make judgment be effective to training execution of medium velocity than low velocity.
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