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김백겸,신태희,백승엽,이은상 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-
Electro-chemical Machining, the anodic dissolution process is able to achieve wanted a sharp shape and high quality surface without contact with workpiece and low heat effect using electrochemical reaction between anode and cathode. In hence this process useful to apply micro structure. A shape memory alloy for micro-structure and micro industrial technique, Nitinol is composed of approximately 55% Nikel and 45% Titanium by weight. This material is able to function as to transform specific shape from a certain deformation when the alloy is heated. Therefore Nitinol is used for several industries such as a medical industry, a aerospace, electrical application on a part of micro structure. In this paper, effect of electrolyte is studied on electrochemical machining for Nitinol shape memory alloy, copper is used for electrode, diameter and depth are measured as a extent of processing using optical microscope.
마이크로 핀을 이용한 니티놀 형상기억 합금의 마이크로 전해가공 특성 분석
신민정,백승엽,김백겸,이은상 한국공작기계학회 2007 한국공작기계학회 추계학술대회논문집 Vol.2007 No.-
Electrochemical micro machining, the anodic dissolution process without contact with tools, can achieve a wanted shape of the surface using electrochemical reaction between anode and cathode. Nitinol is a metal alloy composed of Ni and Ti around 50% respectively which has shape memory effect. Nitinol can be put various applications which require micro scale structure. The aim of this study is to investigate the characteristic of electrochemical micro machining for nitinol workpieces. In order to analyze the characteristics of electrochemical micro machining for nitinol, tungsten carbide micro pin was used for electrode and the machined area was observed by optical microscope.
Baek, Seung Yub,Choi, Woong Kirl,Choi, Young Jae,Lee, Eun Sang Trans Tech Publications, Ltd. 2016 Advanced materials research Vol.1136 No.-
<P>Micro/nanoscale diamond cutting tools used in ultra-precision machining can be fabricated by precision grinding, but it is hard to fabricate a tool with a nanometric cutting edge and complex configurations. High-precision geometry accuracy and special shapes for microcutting tools with sharp edges can be achieved by focused ion beam (FIB) milling. However, in the FIB milling process, the surface properties of the substrate (such as a diamond substrate) are affected by the amorphous damage layer caused by the FIB gallium ion collision and implantation and these influence the diamond cutting tool edge sharpness and increase the processing procedure. In this study, to reduce the diamond cutting tool edge sharpness and processing procedure, FIB milling beam current and tilting angle characteristics of single-crystal diamond were investigated, along with method for decreasing the FIB-induced damage on diamond tools by platinum (Pt) coating on the diamond substrate. Experimental results revealed that optimize beam current, tilting angle and platinum (Pt) coating could lead to relatively few processing procedure and sharp cutting tool edge. The obtained results are an endeavor to enhance the controllability of the diamond cutting tool FIB milling.</P>
Baek, Seung Yub,Lee, Jung Hyung,Lee, Eun Sang,Lee, H.D. Trans Tech Publications, Ltd. 2007 Key Engineering Materials Vol.329 No.-
<P>To enhance the precision and productivity of ultra precision aspheric surface micro lens, the development of ultra-precision grinding system and process for the aspheric surface micro lens are described. In this paper, an ultra-precision grinding system for manufacturing the aspheric surface micro lens was developed by considering the factors affecting the grinding surface roughness and profile accuracy. This paper deals with the mirror grinding of an aspheric surface micro lens by resin bonded diamond wheel and with the spherical lens of BK7. The optimization of grinding conditions with respect to ground surface roughness and profiles accuracy is investigated by design of experiments.</P>
백승엽(Seung-Yub Baek),이광호(Kwang-ho Lee),최승건(Seung-Geon Choi),김성현(Seong-Hyun Kim),최웅걸(Woong-Kirl Choi),김중호(Jung-Ho Kim),박종범(Jong-Beom Park) 한국산학기술학회 2015 한국산학기술학회 학술대회 Vol.2015 No.1
다양한 농작업을 수행하기 위한 농업용 트랙터의 후방에 작업시기에 맞는 다양한 작업기를 장착하게 된다. 트랙터를 전방으로 진행하면서 후방에 장착된 작업기를 동시에 조정하는 것은 많은 문제점을 가지고 있다. 본 논문에서는 후방에 장착된 작업기를 원활히 조정할 수 있도록 회전형 캐빈의 개발을 앞서 압쇄 시험에 따른 구조해석을 진행하였다. ISO기준에 따라 첫 번째 압쇄 시험과 두 번째 압쇄 시험에 관하여 구조해석을 진행하였으며, 해석 결과를 바탕으로 트랙터용 캐빈의 개발을 진행할 것이다.
Web 기반의 내부 정보유출 차단기법 및 프로토콜 설계
백승엽(Seung-Yub Baek),장성만(Sung-Man Jang),이극(Geuk Lee) 한국정보과학회 2004 한국정보과학회 학술발표논문집 Vol.31 No.2Ⅰ
본 논문에서는 내부로의 정보유출 보호를 위해 패킷의 이동경로를 분석함으로써 내부적으로 노출되어 있는 패킷에 송수신량을 측정하여 패킷 도청을 차단하는 기업을 제안한다. 서버와 클라이언트로 구현하여 웹을 통하여 실시간으로 패킷의 도청을 탐지 및 차단할 수 있도록 설계 및 구현하였다.