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김영훈,리두이콴,지영준,안경관,황창호,Kim, Younghoon,Le, DuyKhoa,Chee, Youngjoon,Ahn, Kyoungkwan,Hwang, Changho 대한의용생체공학회 2013 의공학회지 Vol.34 No.3
This study is about the development of the wrist rehabilitation system for the patient who has limited capability of movement after stroke. Electromyography triggered training system (ETTS) can play the role between complete passive training and patient activating training system. Surface EMG was measured on pronator teres muscle and biceps brachii muscle for wrist pronation and supination. Our system detects whether the subject makes muscular effort for pronation or supination or nothing in every 50 ms. When the effort level exceeds the preset percentage of maximal voluntary contraction, the motor rotates according to the direction of the intention of the subject. EMG triggers the motor rotation for the wrist rehabilitation training until the preset angle. To evaluate its performance, the maximum voluntary contraction level was measured for 4 subjects at first. With the audio-visual instruction to rotate the wrist (pronation or supination) the subjects made effort to follow the instruction. After calculating root mean square (RMS) for 50 ms, the controller determines whether there was muscular effort to rotate while holding the motor. When there was an effort to rotate, the controller rotates the motor 0.8 degree. By comparing the RMS values from two channels of EMG, the controller determines the rotational direction. The onset delay is $0.76{\pm}0.24$ s and offset delay is $0.65{\pm}0.22$ s for pronation. For supination the onset delay is $1.24{\pm}0.41$ s and offset delay is $0.77{\pm}0.22$ s. The system responded fast enough to be used for rehabilitation training. The controller perceived the direction of rotation 100% correctly for the pronation and 97.5% correctly for supination. ETTS was developed and the fundamental functions were validated for normal subjects. The clinical validation should be done with patients for real world application. With ETTS, the subjects can train voluntarily over the limitation of the range of motion which increases the effectiveness of the rehabilitation training.
김영훈(Younghoon Kim) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
CAE based durability assessment is used in vehicle development widely to reduce cost and time for physical testing. Recently there is a trend to consider manufacturing variation in CAE process to advance reliability of the analysis result. Vehicle chassis components should withstand various loads by wheel movement during vehicle operation. Especially, brake shield is very sensitive to resonance effect due to its thin and planar shape. Durability assessment of brake shield should include vibrational load in frequency domain as well as static load. This paper describes vibration fatigue analysis of brake shield considering manufacturing process that includes thickness variation from stamping and assembly condition.
김영훈(Younghoon Kim),강동진(Dongjin Kang) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
The park brake lever has various design parameters that effect on the performance during applying lever. Targeted performance selected in this study is the operating force of release button. The parameters supposed to contribute to the targeted performance are pawl spring, rod spring, push rod stiffness and assembly load. The sensitivity of design parameters was analyzed using finite element analysis based on the design of experiment and the effect of design parameters for button operating force was evaluated quantitatively.
HBO의 『보드워크 엠파이어』: 에녹 너키 톰슨과 아메리칸 드림의 몰락
김영훈(Kim, Younghoon) 새한영어영문학회 2018 새한영어영문학 Vol.60 No.4
HBO’s Boardwalk Empire is an American historical TV series. The show’s main character is Enoch Nucky Thompson, Atlantic City’s political boss and racketeer during the Prohibition era. Inspired by Karl Marx’s oft-quoted statement that history repeats itself “first as tragedy, then as farce,” this paper explores how Boardwalk Empire represents the historical repetition of the American dream. Nucky Thompson is an American tragic hero. According to the show’s description of the Thompson character, despite all the economic success and political power, Thompson’s American dream is destined to fail due to his original sin. As it attributes Thompson’s failure to his past, immorality and illegality, the show unwittingly veils the systemic impossibility in achieving the American dream in contemporary America. Marx argued that history returns to us as farce, so we can happily part from it. From this point of view, Boardwalk Empire tells us that we are still prisoners of the American dream.