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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.
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.
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 ㎚.
가변 빔익스팬더 기반의 최적 주사경로 생성 알고리즘 개발
최경현(Kyung-Hyun Choi),김형찬(Hyung-Chan Kim),도양회(Yang-Hoi Doh),김동수(Dong-Soo Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
In Solid Freeform Fabrication System (SFFS), the reduction of total processing time is very important specifically for SLS process that is sintered using heat energy. When the time delay occurs in the process, shrinkage, warpage and curling occur by a heat energy distribution difference and effect the accuracy and the system efficiency. Therefore, the reduction of total processing time is an important issue in SFF system. A digital mirror system (DMS) is a system which scans the laser beam with different spot size. The spot size is selected based on the slicing section to decrease and accuracy of the process time and improve the processing efficiency. In this study, the optimal scan path generation for DMS will be addressed, and this development will improve the whole processing efficiency and accuracy through the scan efficiency by considering the existing scan path algorithm and heat energy distribution.