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방향성 결합기 입사도파로의 최적 접근각도의 광모드 과잉쏠림 현장의 조절
이현식,오범환,최철현,노현식,이승걸,박세근,이일항,Lee, Hyun-Shik,O, Beom-Hoan,Choi, Chul-Hyun,Noh, Hyun-Sik,Lee, Seung-Gol,Park, Se-Geun,Lee, El-Hang 한국광학회 2006 한국광학회지 Vol.17 No.1
We investigate a method to improve the extinction ratio of directional couplers by controlling the angle of approach to their input ports and controlling the error limit for improving the extinction ratio of the directional coupler. Although relatively large angle of approach to the input port usually causes an error in calculations made by mode propagation analysis(MPA), optimally designed angle of approach not only minimizes errors in MPA calculations but also can improve extinction ratio by precision control of coupling coefficients of optical modes. We show that abrupt changes in approaching angle, although not enough to cause modal leakage, give rise to field-profile overshooting, which degrades extinction ratio and other properties of the directional coupler. Using Beam Propagation Method (BPM) we calculate two types of input structures, linear and curved, for optimization of extinction ratio. 방향성 결합기의 소멸비 특성 개선을 위해 입사도파로의 접근각도를 조절하는 방안의 가능성과 오차한계를 살펴보았다. 입사도파로의 접근각도가 크면 단순한 모드분석 이론의 틀에 오차를 유발하게 되지만 적절하게 조절하면 오차를 극소화하면서도 입사되는 광모드의 결합계수를 미세 조절함으로써 소멸비를 개선하는 효과가 있었다. 급격한 접근각도의 설정 시에는 비록 그 각도가 작아서 유출모드(leak mode)에 의한 손실이 있기 전이더라도 광모드의 과잉쏠림(field-profile overshooting)에 의해 각종 특성의 열화가 생기기 시작하는 것을 발견하고 그 영향을 분석하였다. 진행 광모드의 변화는 BPM(Beam Propagation Method)으로 전산 모사하였으며, 직선형 및 곡선형의 두 가지 입사도파로 구조에 대해 특성변화를 비교하여 소멸비 특성을 최적화하는 조건을 얻어내었다.
이현식(Lee Hyun-Sik) 국어국문학회 2009 국어국문학 Vol.- No.152
「The Record of the capital of Qing dynasty」 is an article of 『Yeolhe-ilgi』 of Yeonam Park Jiwon(燕巖 朴趾源, 1737~1805)' writing. He arrived at Beijing, the capital of Qing dynasty on August 1, 1780. He wrote this article the day. He said in it that a few sages set up the Sinic civilization, while many fools had carried on the Sinic civilization, who had pursue their own interests instead of following of former sages' mind. And he also talked about a grand scale of Beijing and the status of Qing dynasty as a ruler of China. His statements signified that Qing dynasty was a successor to the Sinic civilization like many fools. He said, so to speak, that the orthodoxy of Qing dynasty had to be recognized. It was his agenda that he proved that Qing dynasty was also a successor to the Sinic civilization. People of Chosun dynasty generally had believed that Only a Han Chinese dynasty could became a successor to it. But He said that Han Chinese dynasties and barbarian dynasties had ruled China by turns, and that as they was equal for foolishness except a few sages, so there was not only no difference between the two dynasties, but also no connection between the blood and the qualification of succession More surprisingly, he regarded Qing dynasty as a practicing follower of Confucius. The contemporary intellects of Chosun dynasty looked at Qing dynasty in view of the doctrines of great land to change the barbarians(尊周攘夷), which was regared as the teachings of Confucius. So the doctrines of Confucius was not recognized to be a compatible concept with the orthodoxy of Qing dynasty But Park had an different angle on the problem. He thought that though Qing dynasty was a barbarous in the blood, it had already practise the teachings of Confucius, and so transformed into a successor to Confucius. He believed that there was no conflict relationship between the doctrines of Confucius and he orthodoxy of Qing dynasty, and there was only a succeeding relationship between the two. The argument for Qing dynasty in 『Yeolha-ilgi』 build up to a climax in this article. During the travel to Beijing, he was absorbed in thinking of what Qing dynasty was to Chosun dynasty, and of how Chosun dynasty could appreciate it. It was the result of an immense amount of labor that He raised the doctrines of Qing dynasty's transforming into the Sinic civilization, and suggested to recognize the orthodoxy of Qing dynasty.
조직구조가 지식집약적 서비스기업의 혁신에 미치는 영향에 관한 이론적 연구
이현식 ( Hyun Sik Lee ),이경재 ( Steve K Lee ) 한국유통경영학회(구 한국유통정보학회) 2013 유통정보학회지 Vol.16 No.3
그 동안 연구자들이 광범위한 의미에서 혁신에 대해 많은 관심을 가져왔지만 지식집약 서비스 기업 측면에서 혁신을 생각하기 시작한 것은 오래되지 않았다. 이 논문은 지식집약 서비스 기업에서의 혁신을 조직단위 측면에서 분석하고 작고 단순한 조직 구조에 초점을 맞춤으로써 조직 규모와 구조가 지식집약적 기업내의 혁신에 미치는 영향에 대해 알아보고자 한다. 그 동안 조직 복잡성과 혁신간의 관계가 주로 제조업 측면에서 연구되어짐에도 불구하고 이러한 연구를 통해 나온 결과들과 시사점들이 제조업이 아닌 산업들에 비판적 수용 없이 적용되어 왔던 점을 고려할 때 이 논문은 단순한 조직 구조가 서비스 기업의 혁신에 미치는 상대적인 영향력에 관한 새로운 관점을 제공하는데 기여 할 것이다. 또한 조직 내의 리더십이 가지는 지대한 역할을 고려해서, 본고에서는 변혁적 리더십이 지식집약적 서비스 기업의 작고 단순한 조직구조와 혁신간의 관계에 영향을 미치는 조절 효과에 대 해서도 제안하고자 한다. While innovation in its broadest sense has received a great deal of attention from researchers, insights into innovation in Knowledge-Intensive Service (KIS) firm has only recently begun to emerge. By applying innovation in KIS firm to the organizational level of analysis, and focusing on smaller and less complex organization, this research paper considers the impact of organization structure on innovation in service firm. Considering that historically, the relationship between organizational complexity and innovation has been studied in terms of manufacturing perspective, but has been applied in other contexts and industries, this study will contributes to new insights regarding the relative influence of smaller and Jess complex organization on innovation in service firm. In this paper, due to its prominent role of leaderships within organization, I include the moderating effects of transformational leadership on the relationship between smaller and less complex: organization and innovation in KIS service firm. Also, two environmental variables, uncertainty and competition, are included as another moderator of that relationship.