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Range-Adaptive Wireless Power Transfer Using Multiloop and Tunable Matching Techniques
Jungsik Kim,Jinho Jeong IEEE 2015 IEEE transactions on industrial electronics Vol.62 No.10
<P>In this paper, a range-adaptive wireless power transfer (WPT) system is proposed to achieve high efficiency over a wide range of distances by using tunable impedance matching techniques. A multiloop topology is employed to greatly reduce the variation in the input impedance of the WPT system with respect to the distance, where one of the four loops with a different size is selected, depending on the distance. It enables the design of a simple tunable matching circuit using a single variable capacitor. An algorithm is written to find the optimum loop and capacitance in the matching network, based on the measured input return loss using a directional coupler and rectifiers. The fabricated WPT system shows a range-adaptive operation with high efficiency over a wide range of distances. It attains 48% efficiency at a distance of 100 cm with a maximum efficiency of 92% at a distance of 10 cm.</P>
Jungsik Kim 한국경영컨설팅학회 2013 경영컨설팅연구 Vol.13 No.3
본 연구는 세 종류의 리더십(변혁적, 거래적, 및 방임적 리더십), 종업원 탄력성, 및 지각된 삶의 의미성 간의 관계를 분석하였다. 11개의 기업에 근무하는 292명의 직장인을 대상으로 설문조사를 실시하여 변혁적 리더십, 거래적 리더십, 방임적 리더십, 종업원 탄력성 및 삶의 의미성을 측정하였다. 자료의 통계분석 결과 변혁적 리더십은 종업원 탄력성과 정의 관계를 가지는 것으로 밝혀졌으며, 거래적 리더십은 종업원 탄력성과 부적 관계를 가지며, 방임적 리더십은 유의한 관계를 보이지 않는 것으로 나타났다. 또한 지각된 삶의 의미성은 변혁적 리더십과 종업원 탄력성을 완전 매개하는 것으로 나타나 변혁적 리더십이 종업원 탄력성에 대한 영향의 작동기제를 설명하는 변수임을 밝혔다.
A Haptic Interaction Method Using Visual Information and Physically Based Modeling
Jungsik Kim,Janabi-Sharifi, Farrokh,Jung Kim IEEE 2010 IEEE/ASME transactions on mechatronics Vol.15 No.4
<P>Haptic feedback can be used to sense a physical environment at a remote site in order to overcome spatial or scale barriers in telemanipulation. The aim of this paper is to develop a haptic interaction method for a deformable object manipulation system by means of image processing and physically based modeling techniques. The interaction forces between the instrument driven by a haptic device and a deformable object are inferred in real time based on the visual information from a slave environment without force sensor. A physically based model of the deformable object is constructed by integrating the geometric information from vision, <I>a priori</I> knowledge of the object mechanical properties, and a predefined coordinate system of the slave environment. The forces are then derived from the model, while a boundary condition is updated based on the images (a tool-tip position tracking). In order to demonstrate the applicability and effectiveness of the proposed algorithm, macro- and microscale experimental systems were built and equipped with a telemanipulation system and a commercial haptic display. The proposed method was verified using silicone (macroscale) and zebrafish embryos (microscale).</P>