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조시형(Si-Hyeong Cho),박찬원(Chan-Won Park) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
본 연구는 단위중량이나 모양이 일정하지 않아 계수가 곤란한 미소 비균일체의 지능형 계수기의 개발에 관한 연구이다. light beam screen sensor에 의해 형성된 광막 사이로 물체가 통과할 때, 미소한 부분의 빔의 변화량을 검출하고 파형 정형을 하여 발생하는 펄스를 카운트하는 장치로서 기존의 광센싱 계수방식과는 달리 크기와 모양이 불균일한 곡물류의 정확한 계수검출을 위하여 광센서 신호의 하드웨어 필터기술과 이를 소프트웨어적으로 정확하게 분별할수 있도록 하는 기술을 개발하였다.
조시형(Cho, Si-Hyeong),박찬원(Park, Chan-Won) 강원대학교 산업기술연구소 2009 産業技術硏究 Vol.28 No.B
This paper presents the development of smart counting system that is proper for grains with uneven unit weight or shape. This device can detect the small differences of a light beam and count the pulse from wave shape control, when the grain is going on the light screen, which is made by the light beam screen sensor. It can, different from the former conventional device, distinct the uneven grains for counting detect, by using the dedicated hardware and the software algorithm of the light sensor.
듀얼 디퓨저 리소그래피를 이용한 3 차원 마이크로 구조의 제작
한동호,류헌열,조시형,박진구,Han, Dong-Ho,Hafeez, Hassan,Ryu, Heon-Yul,Cho, Si-Hyeong,Park, Jin-Goo 한국재료학회 2013 한국재료학회지 Vol.23 No.8
Recently, products that a have 3-dimensional(3D) micro structure have been in wide use. To fabricate these 3D micro structures, several methods, such as stereo lithography, reflow process, and diffuser lithography, have been used. However, these methods are either very complicated, have limitations in terms of patterns dimensions or need expensive components. To overcome these limitations, we fabricated various 3D micro structures in one step using a pair of diffusers that diffract the incident beam of UV light at wide angles. In the experiment, we used positive photoresist to coat the Si substrate. A pair of diffusers(ground glass diffuser, opal glass diffuser) with Gaussian and Lambertian scattering was placed above the photomask in the passage of UV light in the photolithography equipment. The incident rays of UV light diffracted twice at wider angles while passing through the diffusers. After exposure, the photoresist was developed fabricating the desired 3D micro structure. These micro structures were analyzed using FE-SEM and 3D-profiler data. As a result, this dual diffuser lithography(DDL) technique enabled us to fabricate various microstructures with different dimensions by just changing the combination of diffusers, making this technology an efficient alternative to other complex techniques.
미세금형 가공을 위한 전기화학식각 공정의 유한요소 해석 및 실험결과 비교
류헌열,임현승,조시형,황병준,이성호,박진구,Ryu, Heon-Yul,Im, Hyeon-Seung,Cho, Si-Hyeong,Hwang, Byeong-Jun,Lee, Sung-Ho,Park, Jin-Goo 한국재료학회 2012 한국재료학회지 Vol.22 No.9
To fabricate a precise micro metal mold, the electrochemical etching process has been researched. We investigated the electrochemical etching process numerically and experimentally to determine the etching tendency of the process, focusing on the current density, which is a major parameter of the process. The finite element method, a kind of numerical analysis, was used to determine the current density distribution on the workpiece. Stainless steel(SS304) substrate with various sized square and circular array patterns as an anode and copper(Cu) plate as a cathode were used for the electrochemical experiments. A mixture of $H_2SO_4$, $H_3PO_4$, and DIW was used as an electrolyte. In this paper, comparison of the results from the experiment and the numerical simulation is presented, including the current density distribution and line profile from the simulation, and the etching profile and surface morphology from the experiment. Etching profile and surface morphology were characterized using a 3D-profiler and FE-SEM measurement. From a comparison of the data, it was confirmed that the current density distribution and the line profile of the simulation were similar to the surface morphology and the etching profile of the experiment, respectively. The current density is more concentrated at the vertex of the square pattern and circumference of the circular pattern. And, the depth of the etched area is proportional to the current density.
김원식(Won-Sik Kim),조시형(Si-Hyeong Cho),박찬원(Chan-Won Park) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
본 연구는 최근의 조명시설에서 LED광원의 장점이 많아 일반도로 또는 고속도로의 조명 광원으로도 LED로 교체되는 시도가 활발해짐에 따라 LED도로조명제어를 위한 중앙관제시스템을 개발에 관한것이다. LED 라인조명 제어장치를 기본구성으로 도로난간에 조명등이 연속하여 라인조명으로 설치되고 이들의 양방향제어를 위한 중계기와 이를 무선으로 연결하는 기간통신망전환장치, 그리고 이를 통합 운용하는 중앙관제장치로 구성되는 시스템의 개발에 관한 연구이다.
플렉시블 스테인레스 스틸의 미세구조 제작과 표면 특성 연구
이수민(Su Min Lee),조시형(Si Hyeong Cho),박진구(Jin Goo Park),이성호(Sung Ho Lee) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Recently there is an increasing demand for the application of hydrophobic surface in industrial and biological processes. It has been found that the contact angle with liquid, closely related to hydrophobicity of a solid surface, is largely determined by micro/nano-geometrical structure and chemistry of the solid surface. In this research, we studied the change of contact angle on stainless steel surface after the formation of micro patterns by using photolithography, electro chemical fabrication (ECF) and FeCl3 wet etching process. Based on the models built by Wenzel and Cassie-Baxter, the depth of etch, (h), width of pattern (a), space of pattern, (b) were optimized to obtain the largest contact angle. As a result the contact angle was increased by the increase of ratio value. And it was observed that the contact angle was increased by the increase of the surface roughness by using FeCl3 wet etching. It is expected that the hydrophobicity of the stainless steel surface can be controlled by using these methods.
금속 패터닝과 Blank노광을 이용한 감광성 유리의 미세가공
조재승(Jae-Seung Jo),강형범(Hyung-Bum Kang),윤혜진(Hye-Jin Yoon),김효진(Hyo-Jin Kim),임현우(Hyun-Woo Lim),조시형(Si-Hyeong Cho),임실묵(Sil-Mook Lim) 한국표면공학회 2013 한국표면공학회지 Vol.46 No.3
The simple and cost-effective microfabrication method of photosensitive glass (PSG) using metal patterning and blank exposure was proposed. Conventional photolithography for micromachining of PSG needs a costly quartz mask which has high transmittance as an optical property. However, in this study the process was improved through the combination of micro-patterned Ti thin film and blank UV exposure without quartz mask. The effect of UV exposure time as well as the DHF etching condition was investigated. UV exposure test was performed within the range from 3 min to 9 min. The color and etch result of PSG exposed for 5 min were the most clear and effective to etch more precisely, respectively. The etching results of PSG in diluted hydrofluoric acid (DHF) with a concentration of 5, 10, 15 vol% were compared. The effect on the side etch was insignificant while the etch rate was proportional as the concentration increased. 10 vol% DHF results not only high etch rate of 75 μm/min also lower side etch value after PSG etching. This method facilitates the microfabrication of PSG with various patterns and high aspect ratio for applying to advanced applications.
조시형,박찬원 江原大學校 産業技術硏究所 2010 産業技術硏究 Vol.30 No.B
This paper presents the development of LED street light lamp which is controled by central command system. This system includes a lamp unit controller, data repeater and command repeater as well as the LED lamps. These devices enable the individual power control and partial on/off control of the LED lamps by the control repeater through full duplex communication line. Also, they have the ability to control the brightness and period of on/off timing by detecting the car's existence. As a result of this development, it is founded that the performances of the system have been satisfied to apply for the actual road test.