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LiNbO$_3$ Mach-Zehnder 간섭기형 CPW(Coplanar waveguide) 광변조기 제작 및 특성비교
김성구,윤형도,윤대원,박계춘,이진,정해덕,Kim, Seong-Ku,Yoon, Hyung-Do,Yoon, Dae-Won,Park, Gye-Choon,Lee, JIn,Chung, Hae-Duck 한국전기전자재료학회 1998 전기전자재료학회논문지 Vol.11 No.10
In this study, we describe the properties of an electro-optical modulator with CPW(coplanar waveguide) electrode fabricated on $LiNvO_3$ optical waveguide, that is applicable to optical communications. These optical modulators have features that use a buffer layer to reduce velocity mismatch between microwaves and optical wave as well as employ CPW to improve impedance and propagation mode mismatch between the electrode and the external circuits. And an annealed proton exchange technique for obtaining low-loss optical waveguides and good reproducibility was employed. Taking into consideration the mentioned background, to achieve the lower driving voltage of optical modulator, we have re-disigned the longer interaction length. And their device properties are discussed also. As a result, fabricated optical modulators of good 10Gps operation and low voltage(5.6V of the halfwave lengfth voltage) at an $1.5{\mu}m$ wavelength are achived with good reproducibility.
Single Immunochemical Fecal Occult Blood Test for Detection of Colorectal Neoplasia
Dae Kyung Sohn,Seung Yong Jeong,Hyo Seong Choi,Seok Byung Lim,Jin Myeong Huh,Dae Hyun Kim,김대용,Young Hoon Kim,Hee Jin Chang,Kyung Hae Jung,Joong Bae Ahn,Hyun Kyung Kim,Jae Gahb Park 대한암학회 2005 Cancer Research and Treatment Vol.37 No.1
Purpose: This study was designed to investigate the validity of a single immunochemical fecal occult blood test (FOBT) for detection of colorectal neoplasia. Materials and Methods: A total of 3,794 average-risk screenees and 304 colorectal cancer patients admitted to the National Cancer Center, Korea, between May 2001 and November 2002, were studied prospectively. All screenees and admitted patients underwent FOBT and total colonoscopic examinations. Stools were self-collected, and examined using an immunochemical fecal occult blood test (OC-hemodia , Eiken Chemical Co. Tokyo, Japan) and an OC-sensor analyzer (Eiken Chemical Co. Tokyo, Japan). Results: Of the 3,794 asymptomatic screenees, the colonoscopy identified colorectal adenomas and cancers in 613 (16.2%) and 12 (0.3%) subjects, respectively. The sensitivities of a single immunochemical FOBT for detec- ting colorectal cancers and adenomas in screenees were 25.0 and 2.4%, respectively. The false positive rate of FOBT for colorectal cancer in screenees was 1.19%. For the total 316 colorectal cancer cases (including 12 cases from screenees), the FOBT sensitivities according to the T-stage were 38.5, 75.0%, 78.9 and 79.2% for T1, 2, 3 and 4 cancers, respectively. The sensitivities according to the Dukes stages A, B and C were 63.4, 79.3 and 78.6%, respectively. Conclusion: The sensitivities of a single immunochemical FOBT for detecting colorectal cancers and adenomas in screenees were 25.0 and 2.4%, respectively. The sensitivities of FOBT were about 80% for Dukes B or C colorectal cancers and 63.4% for Dukes A.
외신이 재현하는 한국의 자화상: 이명박 정부 5년에 대한 외신홍보 실적 자료를 중심으로
김성해 ( Sung Hae Kim ),곽대섭 ( Dae Sup Kwak ),유정재 ( Jung Jae Yoo ),조민규 ( Min Gyu Jo ) 한국지역언론학회 2013 언론과학연구 Vol.13 No.2
본 연구는 이명박 정부 5년 동안 이루어진 외신의 한국 관련 보도양상을 임기 기간별 및 외신의 소속 국가별로 분석함으로써 향후 효과적인 외신 홍보 전략에 대한 함의를 찾는 것을 목적으로 했다. 정부 각 부처에서 자체적으로 외신보도 실적으로 분류한 홍보성 기사 166개를 분석대상으로 삼았으며 분석항목으로는 보도주체, 기사작성자, 핵심정보원, 보도주제, 뉴스가치 및 한국의 과제 등을 포함했다. 분석결과, 한국에 대한 기사는 미국, 중국, 일본 순으로 많이 보도한 것으로 나타났다. 국가별 매체에서 미국은 월스트리트저널, 일본은 마이니치, 중국은 환구시보의 보도 빈도가 높았다. 기사작성자의 경우 시기별·국가별 모두 자사기자(해외파견 특파원)를 통한 보도가 가장 많았다. 핵심정보원 중에서 가장 높은 비율을 차지한 것은 대통령이었고 정부 관료가 그 다음으로 많았다. 그러나 임기 말에는 정부 관료가 대통령보다 더 많이 인용되고 있었다. 보도주제에서 외신은 대통령 관련, 대외정책관련, 금융시장동향을 주로 다루었다. 대통령 재임 기간에 따른 차이도 있었다. 임기 초에는 대통령 관련 주제와 대외 정책 관련 주제가 많았고 임기 말로 갈수록 한국의 금융시장동향 등에 대한 관심이 높았다. 한국의 국가신용등급 상승과 같은 외부 재료가 보도에 반영되었기 때문으로 파악되었다. 마지막으로 외신은 한국의 향후 과제로 국제관계개선의 필요성을 가장 빈번하게 언급한 것으로 나타났고 그 다음으로는 대통령과 정부의 리더십 발휘였다. 연구자들은 이를 기반으로 해외 언론에 대한 이해 노력, 특파원 관리의 강화와 더불어 대통령, 대외정책과 금융시장 등에 대한 일상적인 정보제공을 통한 발신기회 확대 등을 홍보 전략으로 제시하였다. To win international ``hearts and minds`` is crucial in the current global society. Also is it believed that global news media play an important role not only in reconstructing national image but in shaping global public opinion. However little attention has been paid to understanding the practices of foreign media in a way of comparing national and historical differences. This paper in this regard attempts to examine how those foreign media around the globe actually covered korea related issues. Total 166 articles chosen carefully by Korean government officials both in domestic and abroad were analyzed in terms of producers, subjects, news value and national agenda. Research results show that the majority of Korea related news were come from highly prestigious news media including Wall Street Journal, Broomberg, Ashahi and Xinhua agency. While U.S., China and Japan paid more attention than others, foreign correspondents residing at Seoul were the primary producers in general. News topics as well as news value was also differed by nationalities and time lines. While the majority of the media delievering more articles about the President and foreign policy issues, initial emphasis on human stories about the President went down in the end of the regime. In addition, those foreign media were common in urging Korean society to improve international relationship and showing political leadership. The authors put forward the following suggestion for improving national image and soft power in final: First of all, the Korean government needs to pay additional heeds to making use of the President in way of improving national image; Secondly, it is necessary to project strategical approach to fit with target audience and the media in need; While endeavoring to identifying proper items for news, it is advisable to engage in elaborating discourse for the benefit of winning public attention.