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류진화,김동민,김응수,정명영,Ryu, Jin-Hwa,Kim, Dong-Min,Kim, Eung-Soo,Jeong, Myung-Yung 한국마이크로전자및패키징학회 2011 마이크로전자 및 패키징학회지 Vol.18 No.1
According to increasing of data transfer rate, printed circuit board (PCB) is required improvement of transmission speed. Optical PCB and its packaging technology can be one of the solutions that overcome the limitations of conventional electrical PCB. The data transmission capacity will be increased 10 Tbps at 2015. To this end, studies on various OPCB technologies are being conducted. For cost-effective and high- performance OPCB, studies of optical coupling by polymer replication process are conducted. In this work, optical waveguide and optical fiber array block were sequentially fabricated by polymer pattern replication method. Using this method we successfully demonstrate low loss optical fiber coupling between optical waveguide and optical fiber arrays. And researches on flip chip bonding process and using electro-optic connectors for packaging are conducted.
전자우편을 이용한 설문조사시 응답률, 응답속도, 자료의 질에 영향을 미치는 요인들에 대한 연구
류진화(Jin Hwa Ryu),김종훈(Jong Hoon Kim) 한국경영학회 2003 經營學硏究 Vol.32 No.2
This study investigates what factors affect the response rate, speed, and quality of e-mail survey. It is suggested that the influencing elements include six factors such as personalization, sponsorship, incentives, prenotification. and follow-ups. To verify the validity of six sets of research hypotheses s developed in the study, an experiment with e-mail users was Performed. The 17,480 users identified with e-mail address search-engines were allocated to sixty-four experimental groups through a randomization process. Then, the experimental units of each group were exposed to a unique set of values of independent variables, and their responses to e-mail survey were observed The 652 experimental units responded to the survey, and the response rate turned out to be 3.73%. Data analysis with the ANOVA and Chi-square Test methods showed that five factors except prenotification (personalization, sponsorship, incentives, questionnaire format, and follow-ups) had the impacts on the respondents responses corresponding to the hypotheses, at least to some extent, Yet, with respect to the response speed among the three response dimensions, non of six factors showed any impact corresponding to the hypotheses. Specifically, it was shown that personalization had a positive impact on the response rate and quality as the hypotheses suggest. Using the university sponsorship affected the response rate and quality positively as compared to the use of Private company sponsorship. In contrast, Providing incentives to the test units shoved no significant impact on the response rate and speed. But, some partial evidences for the hypothesis were observed with respect to the impact of incentives un the response quality, questionnaire format seemed to affect the response rate to a significant degree as hypothesized, and it was Partly demonstrated that the factor affected the response quality. In addition, sending follow-ups increased the response rate as hypothesized, but the factor showed no significant impact on the response speed and qualify.
김동민,류진화,정명영,Kim, Dong Min,Ryu, Jin Hwa,Jeong, Myung Yung 한국마이크로전자및패키징학회 2012 마이크로전자 및 패키징학회지 Vol.19 No.4
By the need for high-speed data transmission in PCB, the studies on the optical PCB has been conducted with optical interconnection and its packaging technology. Particularly, the polymer-based optical interconnection has been extensively studied with the advantages such as cost-effective and ease of process. For high-efficiency and passive alignment, the studies were performed using the 45 degree mirrors, MT connector, and etc. In this work, integrated PLC device and fiber alignment array block was fabricated by using imprint technology to solve the alignment and array problem of optical device and the optical fiber. The fabricated integrated block for optical interconnection of PLC device has achieved higher precision of decreasing the dimensional error of the patterns by optimization of process and its insertion loss has an average value of 4.03dB, lower than criteria specified by international standard. In addition, a optical waveguide with built-in lens has been proposed for high-efficiency and passive alignment. By simulation, it was confirmed that the proposed structure has higher coupling efficiency than conventional no-lens structure and has the broad tolerance for the spatial offset of optical waveguide.