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Nanosilver particles-based conductive patterns developed by direct soft imprint lithography
최준혁,S.W. Lee,K.D. Kim,D.G. Choi,J.H. Jeong,E.S. Lee 한국물리학회 2009 Current Applied Physics Vol.9 No.11
For the direct patterning of electronic device structures, the present work explored an idea of using UV imprint based on nanosilver particles-dispersed UV (ultraviolet) curable resin. In current work, asreceived Ag solution was applied to HEMA (hydroxyethyl methacrylate) as an ultraviolet (UV) curable precursor with the addition of photoinitiator (~3 wt%) to formulate electrically conductive resin mixtures with the Ag contents of 40–60 wt%. The UV exposed imprinted patterns with PDMS (polydimethylsiloxane) stamp become electrically conductive after properly optimized heat treatment. Those are, then, wetetched to remove imprint residue, which lead to the formation of the isolated current transfer media. This imprint scheme can contribute to substantially reduced process steps and corresponding costs associated with additional metal processes.
비균일 대기상태를 고려한 함정의 적외선 신호 특성 분석
최준혁(J.H. Choi),김도휘(D.H. Kim),한국일(K.I. Han),하남구(N.K. Ha),장현성(H.S. Jang),이승하(S.H. Lee),김동건(D.G. Kim),김태국(T.K. Kim) 한국전산유체공학회 2017 한국전산유체공학회지 Vol.22 No.1
The IR signal entering into a sensor is composed of the following components: the self-emitted component directly from the object surface, the reflected components of the solar and sky irradiance at the object surface, and the scattered component by the atmosphere without reference to any object surfaces. The self-emitted and reflected components from the object can be lowered by the atmospheric layer between the object and the IR sensor. The principle factors influencing the atmospheric transmittance are the air temperature, the relative humidity and the observation distance. Previous studies on IR signal transmission through the atmosphere are focused on uniform atmospheric conditions and the non-uniform nature of the atmosphere was not properly treated in modeling. In this study, we use the local atmospheric transmittance to simulate the non-uniform atmosphere in analyzing the IR signal from the object surface. The results show that the nonuniform analysis of the atmosphere becomes more important as the wavelength of IR signal increases.
소형/고효율 고분자전해질 연료공급모듈용 Air Blower 개발에 관한 연구
최준혁(J.H. Choi),정인성(I.S. Jung),김주한(J.H. Kim),서정무(J.M. Seo),허진(J. Hur),성하경(H.G. Sung) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
Air Management System is composed by Pump, Fan, Compressor and Blower. In general their performances depend on the capability of the motor, power converter device and controller. Especially, it should be noticed upon designing Air Management System using for Fuel Cell System, that Pump, Fan, Compressor and Blower satisfy the condition of the high performance, high efficiency, high density and reasonable price considering the safety and Economic Efficiency. In order for this, it should be studied that which kind of Motor is the most suited for Air Management System for Fuel Cell, such as Induction Motor, Brushless DC Motor, and Switched Reluctance Motor which is widely using in industry. This paper presents the designing and manufacturing of Outer Rotor Type BLDC Motor and Driver for Air Blower of Air Management System. Experimental results from a laboratory prototype are presented to validate the feasibility of the proposed Air Blower Motor and Driver.