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양동혁(Yang Dong-Hyuk),도양회(Doh Yang-Hoi),좌정우(Jwa Jeong-Woo),김호찬(Kim Ho-Chan),부창진(Boo Chang-Jin),고성택(Ko Sung-Taek) 한국콘텐츠학회 2006 한국콘텐츠학회 종합학술대회 논문집 Vol.4 No.2
문자메시지는 이동통신망에서 무선 데이터 서비스를 위해 가장 널리 사용되는 서비스이다. CDMA 이동통신망에서는 문자메시지 서비스는 한번에 50자의 한글을 전송할 수 있다. 문자메시지 서비스가 일반화되고 MIDI, MP3 등의 멀티미디어 기능을 갖는 칼라 휴대폰이 보급됨에 따라 이동통신사업자는 멀티미디어 메시지를 문자메시지와 같이 P2P로 전송할 수 있는 MMS(Multimedia Massage Service)를 표준화하고 서비스하고 있다. MMS는 문자메시지와 같이 이동통신사업자의 비음성 서비스의 주요 매출 원으로 역할을 할 것으로 기대되고 있다. MMS가 활성화되면 MMS에 첨부되는 멀티미디어 콘텐츠의 저작권을 보호하기 위한 방안이 마련되어야 할 것이다. 본 논문에서는 MMS 시스템의 변경을 최소화하면서 콘텐츠 저작권 보호를 위한 DRM이 적용된 MMS DRM 시스템을 제안한다. 제안된 MMS DRM 시스템은 DRM Packager, DRM Server, DRM Agent를 통하여 MMS에 첨부된 멀티미디어 콘텐츠를 보호하고 다양한 사업모델을 지원할 수 있도록 하여 MMS 활성화에 기여할 것이다. Short message service (SMS) is a popular mobile data service in cellular networks. One SMS message can carry 50 Korean alphabets. Cellular operators standard and develop multimedia message service (MMS) based on P2P as color phones having multimedia solutions such as MIDI, MP3, JPG, PNG, and MPEG have been developed. MMS can be a key cash flow in the non-voice mobile revenue together with SMS. Copyrights protection of contents in a MMS message can be issued as MMS can be the popular P2P service such as MMS. In this paper, we propose MMS DRM system to protect copyrights of contents in MMS with the minimum change of MMS system. The proposed MMS DRM system protect copyrights of contents using DRM Packager, DRM Server, and DRM Agent and support various use cases to activates MMS in mobile networks.
백색 LED 보정 공정 적용을 위한 고점도 형광체 미세 정량토출 공정
양봉수(Bong Su Yang),양영진(Young Jin Yang),김형찬(Hyung Chan Kim),고정범(Jeong Beom Ko),조경호(Kyung Ho Cho),도양회(Yang Hoi Doh) 한국생산제조학회 2016 한국생산제조학회지 Vol.25 No.2
Several research works for finding and optimizing the methods of dispensing high viscosity phosphor used in the fabrication of white LED’s are currently in progress. High viscosity phosphor dispensing with a high accuracy is crucial because the dispensing rate and uniformity directly affect parameters such as the CIE chromaticity diagram, color temperature and luminous flux of white LED’s. This study presents a novel method of dispensing high viscosity phosphor using electrohydrodynamic printing. The dispensing rate was optimized less than 0.01 mg phosphor using experiments and optimizing the process parameters including the standoff distance from the nozzle to the substrate, ink supply pressure, and multi-step pulsed waveform magnitude ratio. The dispensing rate was measured by dispensing 20 dots using drop-on-demand with the optimized parameters, and the experiments were repeated 10 times to maximize the data accuracy. The average dispensing rate that can be reliably used for high viscosity phosphor dispensing was 0.0052 mg.
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.
정전기력 기반의 마이크로 사이즈 폴리머 비드 주입 공정 연구
양봉수(Bong-Su Yang),양성욱(Sung-Wook Yang),고정범(Jung-Bum Ko),최경현(Kyung-Hyun Choi),도양회(Yang-Hoi Doh) 한국동력기계공학회 2016 동력시스템공학회지 Vol.20 No.2
This research proposal is based on a novel non-contact technique of micro-sized bead injection process for fabrication of electronic paper display. This non-contact injection process is based on the principle of electrostatic force and uses micro-sized metal-coated beads dispersed in a solution. The dispersion retention times of three different solutions with viscosities of 10 cps, 100 cps, and 1000 cps were measured by optical equipment showing the retention times of 5 mins, 10 mins, and 30 mins respectively. The dispersion retention rate dropped as the time passed. The dispersion retention characteristic of 1000 cps solution was more stable as compared to those of 10 cps and 100 cps meaning that higher viscosity has better retention properties. The experimental results of bead injection at different viscosity levels of the solution were also measured and a stable injection result was achieved by using 1000 cps solution. This results show that stable injection is dependent on solution viscosity and dispersion.
웹 이송제어 기반의 롤투롤 시스템을 위한 ESD 프린팅 시스템 개발
최경현(Kyung-hyun Choi),양봉수(Bong-su Yang),탄충탄(Tran Trung Thanh),도양회(Yang-hoi Doh),김동수(Dong-su Kim) 한국기계가공학회 2009 한국기계가공학회 춘추계학술대회 논문집 Vol.2009 No.6월
R2R (Roll to Roll) ESD (Electro-static Deposition) system is known as a flexible manufacturing system with many applications. Flexible electronics devices can be made by using ESD printing element technology for mass-production with flexible substrate and conductive ink. Through development of R2R ESD (R2R hybrid) system, R2R ESD takes advantages of low cost, time consumption and high precision. And it is good for manufacturing RFID, solar cell, flexible display etc. This paper proposes a design of ESD printing system and development plan for R2R hybrid system of web transfer control base.
ESD 전극을 이용한 분무코팅 균일도 개선에 관한 연구
당현우(Hyun-Woo Dang),양성욱(Seong-Wook Yang),도양회(Yang-Hoi Doh),최경현(Kyung-Hyun Choi) 한국기계가공학회 2016 한국기계가공학회지 Vol.15 No.2
In this study, experiments are conducted to improve spray coating uniformity by using second and third electrodes based on the electrospray atomization mechanism. The uniformity of fabricated thin films can be improved by adjusting the design of the second electrode. The implementation of the second electrode with an elongated hole and a bending angle of 90° results in highly uniform films. In addition, induced area to substrate is increased by lowering the applied voltage using the third electrode with a round rod shape. A linear correlation between applied voltage and induced area is confirmed. Thin film thickness and surface roughness are measured after the fabrication of thin films through the electrospray process. It is confirmed that a thin film is formed having an average thickness of 273.44 ㎚, a thickness uniformity of less than 10%, and a surface roughness of 3 ㎚.
웹 이송제어 기반의 롤투롤 시스템을 위한 ESD 프린팅 시스템 개발
최경현(Kyung-hyun Choi),양봉수(Bong-su Yang),탄충탄(Tran Trung Thanh),도양회(Yang-hoi Doh),김동수(Dong-su Kim) 한국기계가공학회 2009 한국기계가공학회 춘추계학술대회 논문집 Vol.2009 No.6
R2R (Roll to Roll) ESD (Electro-static Deposition) system is known as a flexible manufacturing system with many applications. Flexible electronics devices can be made by using ESD printing element technology for mass-production with flexible substrate and conductive ink. Through development of R2R ESD (R2R hybrid) system, R2R ESD takes advantages of low cost, time consumption and high precision. And it is good for manufacturing RFID, solar cell, flexible display etc. This paper proposes a design of ESD printing system and development plan for R2R hybrid system of web transfer control base.
광조형물의 패턴두께에 따른 표면 거칠기 저감을 위한 공정연구
김영수(Young-Su Kim),양형찬(Hyoung-Chan Yang),김고범(Go-Beom Kim),당현우(Hyun-Woo Dang),도양회(Yang-Hoi Doh),최경현(Kyung-Hyun Choi) 한국동력기계공학회 2016 동력시스템공학회지 Vol.20 No.4
In this paper, we developed a 3D printing system using a photo-curing resin in order to reduce the surface roughness of a sculpture produced with the 3D printer. Using the pattern of the resulting variable thickness, that gave rise to a stepped shape, and the area error of the photo-curable sculpture, a study was carried out for the process to reduce the surface roughness. At a given value of stage velocity (40~70 mm/s) and output air pneumatic pressure (20~60 kPa), the minimum pattern thickness of the pattern was achieved 65 ㎛ and the maximum pattern thickness of up to 175 ㎛. To increases the pattern resolution to about 40 ㎛, the process conditions should be optimized. 3D surface Nano profiler was used to find the surface roughness of the sculpture that was measured to be minimum 4.7 ㎛ and maximum 8.7 ㎛. The maximum surface roughness was reduced about 1.2 ㎛ for the maximum thickness of the pattern. In addition, a FDM was used to fabricate the same sculpture and its surface roughness measurements were also taken for comparison with the one fabricated using photo-curing. Same process conditions were used for both fabrication setups in order to perform the comparison efficiently. The surface roughness of the photo-curable sculpture is 5.5 ㎛ lower than the sculpture fabricated using FDM. A certain circuit patterns was formed on the laminated surface of the photo-curable sculpture while there was no stable pattern on the laminated surface of the FDM based sculpture the other hand.
강성철(Kang, Sung-Chul),김형찬(Kim, Hyung-Chan),도양회(Doh, Yang-Hoi),이광만(Lee, Kwang-Man),김도현(Kim, Do-Hyeun) 한국산학기술학회 2007 한국산학기술학회논문지 Vol.8 No.6
유비쿼터스 환경을 구성하는 핵심기술 중 하나인 RFlD 기술은 각종 물품에 소형 칩을 부착해 사물의 정보와 주변 환경정보를 무선주파수로 전송·처리하는 비접촉식 인식시스템이다. 현재 RFID 기술은 미들웨어 및 무선 인터페이스 등에 대한 연구가 진행되고 있으며, 또한 물류 및 유통 등의 분야를 비롯한 다양한 응용 분야에 RFID 시스템을 개발하고 있다. 본 논문에서는 지역이나 시설에 대한 보안 및 안전을 위하여 RFlD 미들웨어 기반의 출입문 제어 시스템을 설계하고 구현한다. 이를 위하여 RFlD EPC 코드에 의한 사용자의 출입을 인증하기 위한 알고리즘을 제시하고, RFlD 기반의 사용자 인증 모듈, 다수의 출입문을 개폐하는 제어 모듈, 출입문의 상태 관리 모듈, 출입 여부 도시 모듈, 테스트용 프로그램 등을 구현한다. The RFID Technology (which is importantly used at the Ubiquitous environment) is attached to all of the units like the ID cards and then information on the units and units' environment is transferred and processed through the radio frequency. so it is the no touched recognition system. RFID Technology's research of the middle ware and wireless interface etc. is currently conducted and variously broaden like the industry of the distribution and logistics. This paper suggests that the gate control system which is based on RFID middle ware is realized to prevent the district and facility for security. The indication of this paper is that algorithm (which is to certificate Users' enterance through RFID EPC code) is proposed and realizes the user certification module, the control module of the gates' opening and closing, the maintenance module of the gate, the display module of coming and going information, test program ect. through RFID technology.