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이용인,민춘기,김재운 충남대학교 체육과학연구소 2000 體育科學硏究誌 Vol.18 No.1
The purpose of this study was to analyze the preference of leader behavior styles according to the trait of soccer players. The trait of soccer players was characterized by age, career of winning a prize, birth order. The classified five behavior styles were training and instruction behavior, democratic behavior, autocratic behavior, social support behavior and positiv feedback behavior in the multidimensional model introduced by Chelladurai and Saleh(1980). Total of 286 soccer players were answered to the questionnaire. All subjects were registered players at the federation of soccer and attended national tournament more than once. The findings of this study were as follows: 1) In the preference of leader behavior style among the soccer players, training and instruction behavior was the most perceived behavior style. Democratic behavior, Positive feedback behavior, and social support behavior were preferred to be of second, third and fourth respectively. Autocratic behavior was the least preferred leader behavior style. 2) In the difference of leader behavior style according to the age of soccer players, middle school team preferred more than pro team in the training and instruction behavior, democratic behavior, and positive feedback behavior. 3) No significant difference was found according to the career of winning a prize and birth order of soccer players in the preference of leader behavior styles.
A transparent polymeric flexure-hinge nanopositioner, actuated by a piezoelectric stack actuator
Chae, Ki Woon,Kim, Wook-Bae,Jeong, Young Hun IOP Pub 2011 Nanotechnology Vol.22 No.33
<P>Nanopositioning using piezoelectric actuation and a flexure mechanism is one of most common methods for nanometre-scale positioning. Generally, flexure mechanism nanopositioners have been made from metal. Thus, their application to various environments needs careful consideration with regard to corrosion and circumference interference. In this study, we propose the concept of a chip-like polymeric flexure-based nanopositioner equipped with piezoelectric actuation. In its design, motion performance was predicted using finite element analysis of deformation and stress, and injection mouldability was considered through an injection moulding simulation to allow for fabrication by injection moulding. A cyclic olefin copolymer nanopositioner was fabricated using a mesoscale injection moulding process. Experiments demonstrated that the developed nanopositioner had a travel range of 15 µm with high linearity and it could be successfully controlled by a proportional–integral–derivative (PID) algorithm including a low-pass filter with a root mean square control error of 3 nm. </P>
Role of the modified Saengmaeksan(mSMS) in L-NAME-induced hypertension model
Jin Ki Jung,Hobin Moon,Won Hee Nam,Yun-Hwan Kang,Se-Jin Kim,Young Mi Seok,Hyun Hee Leem,Ji-Woon Jeong,Yu Jin Park,Min Ju Kim,Chae Suk Ra,Jiyoung Seo,Hye Won Shin,Bo Gyung Jang,Hyo Jung Kim 한국실험동물학회 2022 한국실험동물학회 학술발표대회 논문집 Vol.2022 No.7
Cubic Convolution Scaler Optimized for Local Property of Image Data
Jin-Kee Chae,Jae-Yung Lee,Min-Ho Lee,Jong-Ki Han,Nguyen, Truong Q.,Woon-Young Yeo IEEE 2015 IEEE TRANSACTIONS ON IMAGE PROCESSING - Vol.24 No.12
<P>A scaler is one of the most important modules in various video applications, such as ultra-high definition TV and scalable video systems. A variety of scaling techniques have been used to increase the video quality when the resolution of the source image has to be up- and down-scaled. Some conventional schemes exploit the property of local block data. Others consider the edge information of the data to be scaled. In this paper, we formulate a scaling problem to minimize the information loss resulting from the resizing process. The loss is considered in both the spatial and the frequency domains, and then it is minimized to optimize the kernel of the scaler. The simulation results show that the proposed algorithm reduces the information loss more than conventional schemes. When compared with the conventional algorithms, the proposed method outperforms those with similar complexity.</P>
Gang, Myeong Gu,Chae, Ki Woon,Kim, Wook-Bae,Jung, Young Hun,Jun, Martin B.G.,Min, Byung-Kwon Elsevier 2019 Journal of manufacturing processes Vol.37 No.-
<P><B>Abstract</B></P> <P>Microchannels must have appropriate physical (e.g., shape, size and surface roughness) and chemical (e.g., functional groups and wettability) properties to be used in microfluidic devices. In general, microchannels, which are made of polymeric materials, are produced through a molding process and chemically treated to have proper wettability. However, mold fabrication and chemical treatment require a significant amount of time and cost. In this study, we used a micromilling process to fabricate a microchannel on polymer material. The contact angle on the machined surface was changed according to the wettability model by varying the surface roughness controlled by cutting parameters. By mechanical cutting of the naturally hydrophobic polymer, the contact angle could be physically changed from 76° to 109° by changing cutting parameters without any chemical change.</P>
Han, Min-Seop,Chae, Ki Woon,Min, Byung-Kwon IOP 2017 Journal of micromechanics and microengineering Vol.27 No.5
<P>In this study, we created high-aspect-ratio microgrooves in hard, brittle materials using an electrochemical discharge machining (ECDM) process by introducing microtextured machining tool. To enhance the electrical discharge activity, the morphology of the tool side surface was treated via micro-electrical discharge machining to produce fine microprotrusive patterns. The resulting microtextured surface morphology enhanced the electric field and played a key role in improving the step milling depth in the ECDM process. Using the FEM analysis, the evaluation of the field enhancement factor is also addressed. Our experimental investigation revealed microgrooves having an aspect ratio of 1:4, with high geometric accuracy and crack-free surfaces, using one-step ECDM.</P>