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고정범(Jeong Beom Ko),김형찬(Hyung Chan Kim),양영진(Young Jin Yang),김현범(Hyun Bum Kim),양성욱(Seong Wook Yang),오승호(Seung Ho Oh),도양회(Yang Hoi Doh),최경현(Kyung Hyun Choi) 한국기계가공학회 2016 한국기계가공학회지 Vol.15 No.6
The Biosensor biosensor pattern was developed by via an EHD (electro-hydro-dynamics (EHD) patterning process that was performed under atmospheric pressure at room temperature in a single step. The drop diameter was smaller than nozzle diameter and applied high viscosity conductive ink was applied in the EHD patterning method to provide a clear advantage over the piezo and thermal inkjet printing techniques. The Biosensor’s biosensor’s micro electrode pattern was printed by via a continuous EHD patterning method using 3three- type types of control parameters parameter (input voltage, patterning speed, nozzle pressure). High viscosity (1000 cps) conductive ink with 75 wt% of silver nanoparticles was used for experimentation. The incremental result of impedance of biosensor impedance was measured between the antibody (10 ugμg/ml) to spore (0.1 ng/ml, 10 ng/ml, and 1 ugμg./ml) reaction at frequency 493 MHz frequency.
Effect of flow rate in the generation of printed line in electrostatic inkjet system
Ahsan Rahman(아산 라만),Jeong-Beom Ko(고정범),Hyung-Chan kim(김형찬),Su-Jin Kim(김수진),Khalid Rahman(카리드 래만),Asif Ali(아시프 알리),Bong-Su Yang(양봉수),Adnan Ali(아드난 알리),Yang-Hoi Doh(도양회),Kyung-Hyun Choi(최경현),Dong-Won Je 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
The Electrostatic Inkjet system has a huge number of applications in cost and time effected manufacturing of printed electronics like RFID, flexible display, solar cell, sensors, batteries etc. So, the fundamental focus will be to investigate the drop generation phenomena by applying the electrostatic forces. Electrostatic inkjet printing for printed electronics technology is advancing rapidly but it s still in its infancy as inkjet printing system is not able to design complicated devices. This paper explains the behavior of the multiphysics phenomena of the Drop on Demand (DOD) electrostatic Inkjet system for printed electronics devices.
정전기력 분무 공정 기반 마스크 패터닝 시스템 기술 개발
최경현(Kyung-Hyun Choi),당현우(Hyun-Woo Dang),김형찬(Hyung-Chan Kim),고정범(Jeong-Beom Ko),도양회(Yang-Hoe Doh),김동수(Dong-Soo Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
An environmental-friendly spray deposition is different from commercially available deposition techniques like piezo, thermal, and aerosol. Through electrostatically controlled conductive inks, patterns can be achieved on substrate by using submicron mask. In this study a novel process of selective patterning is implemented. This paper discusses an optimized system design for analysis of process variables by electro pray deposition. Colloidal solution contained in a metallic capillary head driven by electrostatic force verified mask patterning experimentally.
고효율 백색 발광다이오드 구현을 위한 고점도 형광체 정량 토출 공정 연구
양영진(Young-Jin Yang),김형찬(Hyung-Chan Kim),고정범(Jeong-Beom Ko),양봉수(Bong-Su Yang),당현우(Hyun-Woo Dang),도양회(Yang-Hoi Doh),조경호(Kyung-Ho Cho),최경현(Kyung-Hyun Choi) 한국청정기술학회 2014 청정기술 Vol.20 No.2
현재 고효율 백색 발광다이오드(light emitting diode, LED) 구현을 위한 고점도 형광체 토출에 대한 많은 연구가 진행 중이다. 백색 발광다이오드에서 제품성능에 영향을 미칠 수 있어 고점도 형광체의 정량토출은 중요하다. 그러나 기존 연구에서 고점도 형광체 정량토출의 어려움이 있었다. 고점도 형광체의 정량토출을 위해서 본 연구에서는 다양한 점도에서 미세토출이 가능한 정전기력 프린팅 기술을 적용하였다. 전압 변화에 따른 요구 적출형(drop on demand, DOD) 토출 실험을 진행하여 토출 시 노즐의 메니스커스 각도와 토출 도트 직경 사이의 상관관계를 도출하였다. 토출 전압이 증가함에 따라, 토출 메니스커스 각도는 증가하고 토출 도트 직경은 감소하였다. Currently various studies are underway for dispensing high-viscosity phosphor. These studies have reported limitations and challenges in the dispensing process. The discharged amount of phosphor was approximately the same each time which is important for the implementation of high-efficiency white LED technology. This paper present high-viscosity phosphor dispensing process for white LED implementation by using electrostatic printing technology. The voltage controlled DOD (Drop-On-Demand) discharge experiment was studied to determine angle of drop meniscus at nozzle and dot diameter. With increase in Discharge voltage, the discharge angle of meniscus increased while dot diameter decreased. Therefore it can be concluded that we can control the discharge rate by controling the discharge angle of meniscus.