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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.
전산유동해석에 의한 발사체 공력 특성 예측에 관한 연구
김영훈(Younghoon Kim),옥호남(Honam Ok),김인선(Insun Kim) 한국전산유체공학회 2004 한국전산유체공학회 학술대회논문집 Vol.2004 No.-
A space launch vehicle departs the ground in a low speed, soon reaches a transonic and a supersonic speed, and then flies in a hypersonic speed into the space. Therefore, the design of a launch vehicle should include the prediction of aerodynamic characteristics for all speed regimes, ranging from subsonic to hypersonic speed. Generally, Empirical and analytical methods and wind tunnel tests are used for the prediction of aerodynamic characteristics. This research presents considerable factors for aerodynamic analysis of a launch vehicle using CFD. This investigation was conducted to determine effects of wake over the base section on the aerodynamic characteristics of a launch vehicle and also performed to determine effects of the sting which exist to support wind tunnel test model.
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.
김영훈(Kim Younghoon),어명근(Eor Myongkeun),이상현(Lee Sanghyeon),조성주(Cho Sungju),정대희(Chung Daehee),안수정(Ahn Soojung),오새라(Oh Saera) 한국농촌경제연구원 2016 한국농촌경제연구원 기본연구보고서 Vol.- No.-
Background of Research The world economy had been pursuing multilateral systems under the WTO. However, regionalism has intensified with rapid expansion of free trade agreements since 1990. On the other hand, the international trade order is recently changing from bilateral FTAs to Mega FTAs. TPP, which was concluded at the end of 2015, is an agreement, intended for economic integration of 12 countries, and by TPP, negotiation of RCEP is also accelerating. Korea has concluded 15 FTAs with 52 countries as of July 2016 and bilateral FTAs with major countries are about to be completed. Therefore, it is time to review negotiation strategies on TPP and RCEP as well as trade policy of Mega FTA. This study reviews issues to consider when negotiating TPP and RCEP, drawing negotiation strategy. Also, it aims to suggest trade strategy which can minimize impact on the agricultural sector and utilize Mega FTAs. Method of Research Literatures regarding trends of international trade order and discussion on Mega FTAs were reviewed to study background of new international trade order. Also, current trade issues which Korea is facing were analyzed through the results of TPP negotiation, discussion and issues of RCEP, previous studies and statistical data. Regular forums and seminars were held to discuss current agricultural trade issues and the implications drawn from the forums were reflected in this study. The agricultural trade forum was formed of experts from agricultural and non-agricultural sectors and it was used as a door to collect extensive opinions. Research Results and Implications It is expected that the international trade negotiation will be developed, mainly by Mega-FTA and certain agendas in future. In particular, TPP established regulations on new trade issues over free trade of goods, including regulations which have not been treated in the WTO. Korea is required to have attitude of careful access since it has to adopt the existing agreement as a late comer. Most of all, conflicts between agricultural and non-agricultural sectors concerning market opening are likely to occur, so responses need to be prepared to minimize social conflicts and costs considering domestic and overseas requirements. In particular, we need to prepare for additional market opening of sensitive products such as rice and measures on reinforcement of SPS regulations. Since Korea opened ASEAN and Chinese markets at a low level through FTAs, RCEP is likely to have bigger effect than that of TPP. Particularly, because there are a lot of agricultural exporters in RCEP, we need to prepare for responses to market access and regulations. Through Mega FTA, Korea will be able to create added value in terms of backward participation which exports manufactured products using the materials from overseas. Not only expanding exports of processed food with customs benefit of materials imported through Mega FTAs, but we also need to make it as an opportunity to export agricultural materials to the member countries.