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편광상이 고리 형태의 다파장 스위칭 가능한 1차 광섬유 유연 필터의 스펙트럼 특성
박경수(Kyoungsoo Park),김영호(Youngho Kim),이용욱(Yong Wook Lee) 한국조명·전기설비학회 2014 조명·전기설비학회논문지 Vol.28 No.8
In this paper, a multiwavelength-switchable first-order fiber flexible filter is newly proposed, which is based on a polarization-diversity loop. The proposed filter consists of a polarization beam splitter, three half-wave plates(HWPs), and two high birefringent fibers(HBFs). The proposed filter has a good flexibility in adjusting relative angular difference between the principal axes of two HBFs by inserting an HWP between two HBFs. The first-order flat-top or narrow band transmission spectra and the zeroth-order transmission spectra, which had a channel spacing of ∼0.8nm, could be obtained by controlling the three HWPs, and, in particular, each of them could also be interleaved. In addition, zeroth-order transmission spectra with a channel spacing of ∼0.8nm could be flexibly converted into those with a channel spacing of ∼0.4nm through the control of three HWPs, and also be interleaved. The transmission characteristics of the proposed filter was theoretically analyzed and experimentally verified.
편광상이 고리 기반 2차 광섬유 유연 빗살 필터의 투과 스펙트럼 특성 분석
박경수(Kyoungsoo Park),이용욱(Yong Wook Lee) 한국조명·전기설비학회 2015 조명·전기설비학회논문지 Vol.29 No.12
In this paper, we propose a second-order fiber flexible comb filter based on a polarization-diversity loop(PDL). The proposed filter consists of a polarization beam splitter, four half-wave plates(HWPs), and three high birefringence fiber(HBF) segments. In the previous Solc-type second-order filter based on the PDL, HBF segments were fusion-spliced with a fixed angle offset between their principal axes with each other. But, the proposed filter implemented by inserting two HWPs between three HBF segments has a great flexibility in adjusting relative angular difference between the principal axes of two adjacent HBF segments. Owing to this flexibility, second-order transmission spectra, which had a channel spacing of ~0.8nm, could be interleaved by controlling the orientation angles of four HWPs. The output transmission spectra of the proposed filter were theoretically analyzed and experimentally verified.
저작권 보호를 위한 폐쇄형 OSP 콘텐츠 자동 검색 방법
박경수 ( Kyoungsoo Park ),김원겸 ( Won-gyum Kim ),김상진 ( Sangjin Kim ),유원영 ( Won Young Yu ) 한국정보처리학회 2011 한국정보처리학회 학술대회논문집 Vol.18 No.1
본 논문에서는 디지털 콘텐츠의 저작권 보호를 위해 인터넷상의 웹하드나 P2P와 같은 폐쇄형 OSP(Online Service Provider)에서 불법으로 유통되고 있는 콘텐츠를 자동으로 검색하고 다운로드 하는 방법을 제안한다. OSP의 웹 페이지를 파싱(Parsing)하여 태그(Tag)와 유일한(Unique)한 속성 정보를 이용하여 필요로 하는 콘텐츠의 게시 정보를 얻거나 액션을 취해 웹 페이지를 제어한다. 또한, IE(Internet Explorer) 이벤트(Event) 함수에 포함되는 URL 정보를 이용하여 각 제어 단계의 성공 여부를 판단한다. 윈도우 기반 어플리케이션은 해당 윈도우의 컨트롤ID 및 기타 윈도우 속성 정보를 이용하여 제어한다.