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미세 피치를 갖는 bare-chip 공정 및 시스템 개발
심형섭,강희석,정훈,조영준,김완수,강신일,Shim Hyoung Sub,Kang Heui Seok,Jeong Hoon,Cho Young June,Kim Wan Soo,Kang Shin Il 한국반도체디스플레이기술학회 2005 반도체디스플레이기술학회지 Vol.4 No.2
Bare-chip packaging becomes more popular along with the miniaturization of IT components. In this paper, we have studied flip-chip process, and developed automated bonding system. Among the several bonding method, NCP bonding is chosen and batch-type equipment is manufactured. The dual optics and vision system aligns the chip with the substrate. The bonding head equipped with temperature and force controllers bonds the chip. The system can be easily modified fer other bonding methods such as ACF.
렌즈 모듈 생산 공정에서 조립 정렬을 위한 자동 초점 제어
김형태(Hyung Tae Kim),강성복(Sung Bok Kang),강희석(Heui Seok Kang),조영준(YoungJoon Cho),박남규(Nam Gue Park),김진오(Jin-Oh Kim) Korean Society for Precision Engineering 2010 한국정밀공학회지 Vol.27 No.2
This study proposed an auto focusing method for a multi-focus image in assembling lens modules in digital camera phones. A camera module in a camera phone is composed of a lens barrel, an IR glass, a lens mount, a PCB board and aspheric lenses. Alignment among the components is one of the important factors in product quality. Auto-focus is essential to adjust image quality of an IR glass in a lens holder, but there are two focal points in the captured image due to thickness of IR glass. So, sharpness, probability and a scale factor are defined to find desired focus from a multi-focus image. The sharpness is defined as clarity of an image. Probability and a scale factors are calculated using pattern matching with a registered image. The presented algorithm was applied to a lens assembly machine which has 5 axes, two vacuum chucks and an inspection system. The desired focus can be determined on the local maximum of the sharpness, the probability and the scale factor in the experiment.
연성 해석 방법을 이용한 잉크젯 헤드의 액적 생성 해석
김준홍(Joon Hong Kim),박문수(Mun Soo Park),이상호(Sang-Ho Lee),강희석(Heui Seok Kang),강경태(Kyung Tae Kang) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
This paper reports a comparison study between the practical experiments and simulations on droplet formation of an OLED ink form an ink-jet head. The ink-jet head is driven by a waveform signal of voltage and time in a squeeze mode. ANSYS is used to analyze piezoelectric actuation and CFX is used for a computational analysis in the fluid region. In simulation of droplet formation, we used an unsteady two-phase three dimensional Navier-Stokes equation for fluid analysis and a fluid-structure interaction (FSI) method for numerical analysis. It is confirmed that the computational results are well coincident with those obtained from jetting experiment. Also, the simulated results show that a meniscus shape is oscillated around a nozzle after droplet ejection.
마이크로 연료전지용 강제 호흡형 공기 공급 모듈에 관한 연구
황준영(Hwang, Jun-Young),윤효진(Yun, Hyo-Jin),이상호(Lee, Sang-Ho),강희석(Kang, Heui-Seok),강경태(Kang, Kyun-Tae) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.05
The present study conducts a series of experiments to develop a novel air supplying module for a micro fuel cell using piezoelectric linear actuator. An intermittently and operating air breathing module with reciprocating motion of the linear actuator has been suggested in the present study. A test bench for a micro fuel cell system has been constructed to estimate performance of the active fuel cell system using the air supplying module. With the stroke and operating duty as main control parameters, the optimal operating method of the air supplying module has been discussed.
잉크젯 프린팅을 이용한 유기태양전지용 기능성 잉크의 적층
김명기(Kim, Myong-Ki),황준영(Hwang, Jun-Young),이상호(Lee, Sang-Ho),강희석(Kang, Heui-Seok),강경태(Kang, Kyung-Tae),김종석(Kim, Jong-Seok),조영준(Cho, Young-Joon) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.05
Inkjet printing is commonly used in the controlled deposition of solutions of functional materials in specific locations on a substrate, and it can provide easy and fast deposition of polymer films over a large area. which could become a way to manufacturer low cost solar cells. In the present study, inkjet printing technology is adopted to deposit functional layers of PEDOT/PSS solutions and P3HT/PCBM blends for organic solar cell. The results show that merging of separately deposited ink droplets into a continuous, pinhole-free organic thin film could be achieved by a balance between ink property and substrate treatment. As a result, a power conversion efficiency of 2.0% has been accomplished a solar cells applying inkjet technology.
저온 선택적 원자층 증착공정을 이용한 유기태양전지용 AZO 투명전극 제조에 관한 실험적 연구
김기철(Ki-Cheol Kim),송근수(Gen-Soo Song),김형태(Hyung-Tae Kim),유경훈(Kyung-Hoon Yoo),강정진(Jeong-Jin Kang),황준영(Jun-Young Hwang),이상호(Sang-Ho Lee),강경태(Kyung-Tae Kang),강희석(Heui-Seok Kang),조영준(Young-June Cho) 대한기계학회 2013 大韓機械學會論文集B Vol.37 No.6
AZO(Aluminium-doped Zinc Oxide)는 기존의 LCD, OLED, 광센서, 유기태양전지 등의 투명전극에 널리 사용되는 ITO(Indium Tin Oxide)를 대체하기 위한 물질로 주목받고 있다. 본 연구에서는 유기태양전지의 투명 전극으로 많이 사용되는 ITO 를 대체하기 위해 원자층 증착(ALD) 공정의 저온 선택적 증착 특성을 이용하여 유연성 폴리머인 PEN 기판상에 AZO 투명전극을 직접 패턴방식으로 제조하고, 그 투명전극의 구조적, 전기적, 광학적 특성을 평가하였다. 전기적, 광학적 특성 결과들로부터 원자층 증작공정의 저온 선택적 증착 특성을 통해 형성된 AZO 투명전극의 유기태양전지로의 적용 가능성을 확인할 수 있었다. AZO (aluminum-doped zinc oxide) is one of the best candidate materials to replace ITO (indium tin oxide) for TCOs (transparent conductive oxides) used in flat panel displays, organic light-emitting diodes (OLEDs), and organic solar cells (OSCs). In the present study, to apply an AZO thin film to the transparent electrode of an organic solar cell, a lowtemperature selective atomic layer deposition (ALD) process was adopted to deposit an AZO thin film on a flexible polyethylene- naphthalate (PEN) substrate. The reactive gases for the ALD process were di-ethyl-zinc (DEZ) and tri-methylaluminum (TMA) as precursors and H2O as an oxidant. The structural, electrical, and optical characteristics of the AZO thin film were evaluated. From the measured results of the electrical and optical characteristics of the AZO thin films deposited on the PEN substrates by ALD, it was shown that the AZO thin film appeared to be comparable to a commercially used ITO thin film, which confirmed the feasibility of AZO as a TCO for flexible organic solar cells in the near future.