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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),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) 신영어영문학회 2021 신영어영문학 Vol.79 No.-
In fashion as well as in popular culture, the suit often symbolizes conformity, masculinity, and class. The critically acclaimed TV show Mad Men (2007-15) features a man in a gray flannel suit, reflecting the dominant men’s dress code in the 1950s. His name is Don Draper, Creative Director of the ad agency, Sterling Cooper. Mad Men emphasizes the malleability of appearance and identity through its depiction of Draper. In re-inventing his identity, Draper finds a man in a suit as a social ideal he strives to achieve. Draper’s suit appearance not only constitutes his identity, but also contributes greatly to his success in society. His suit tells who he is, but it also veils who he really is. Despite all his success he continuously feels estranged and anxiety. His precarious identity is a paradigmatic example of the individual under constant pressure to re-invent oneself for success in the culture of self-help.
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.
Constructing Area Cartogram Using a GIS Based Circular Cartogram Technique
YoungHoon Kim(김영훈) 대한지리학회 2008 대한지리학회지 Vol.43 No.2
지리정보시스템(Geographic Information System, GIS) 활용이 확대됨에 따라서 다양하고 복잡한 사회경제적 변수의 시각적 전달은 공간 분석과 더불어 중요한 연구 주제라고 할 수 있다. 그러나 시각화 기술 자체의 복잡성과 GIS와의 연계성 부족으로 인해 지도화 및 시각화 기법이 제공하는 여러 장점들이 제대로 전달되고 있지 못하고 있다. 이에 대하여 본 연구에서는 카토그램(cartogram) 기법을 적용하여 다양한 인구 관련 변수의 공간적 관계를 효과적으로 지도화할 수 있는 방법을 논의하고자 한다. 이를 위하여 본 연구에서는 범용 GIS 프로그램에서 카토그램이 쉽게 제작될 수 있는 환경을 제안하고, 일반인이나 GIS 초급자들도 손쉽게 구현할 수 있는 과정을 제시하였다. 또한 카토그램의 시각적 정보 전달 및 활용성 증대을 위해서 본 연구에서는 Dorling (1996)이 개발한 원형 카토그램 알고리즘(Circular Cartogram Algorithm, CCA)과 ArcView GIS 3.3. 프로그램의 내적 결합 방법을 적용하여 CCA 기반의 원형 카토그램이 범용 GIS 프로그램내에서 효과적으로 구현될 수 있는 사례를 제시하였다. 마지막으로 실질적인 카토그램 제작 사례로써 2005년 인구 센서스 자료를 대상으로 인구와 가구 변수의 카토그램 지도를 통한 관련 센서스 변수들과 지리적인 공간 분포 패턴의 시각적 분석의 가능성을 제안하였다. Many cartographers have for many years searched for a way to construct cartograms in which the sizes of geographic areas such as states, counties or census tracts are rescaled in proportion to their population or some other socio-economic properties. While many techniques and algorithms for creating cartograms have been proposed, some of them are still extremely complex to generate in a proper manner, and many of them suffer either from this lack of readability or from seamless integration with GIS software. This paper, therefore, presents a simple population cartogram technique based on the Circular Cartogram Algorithm(CCA) by Dorling(1996) to tackle these drawbacks by drawing the areas as simple circles for use as a base map and linking the construction with GIS mapping processes. For an automated approach in the cartogram generation, this paper proposes a close coupling method of ArcView GIS 3.3. package in order for users to access to the cartogram algorithm. Then, they will be available through an interface that the ArcView GIS system allows user-written routines to be accessed easily. The CCA and its coupling architecture ensure to improve the potential applicability of the use of cartograms to census mapping at practical levels. As the cartogram examples, cartograms of population and property types in 2005 Korea census data sets are illustrated in the end, by which viewers can easily identify the residential concentration and their relative ratio in Seoul metropolitan area.