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IPv6를 지원하는 초고속 유/무선 인터페이스와 QoS제공 가능한 고성능 라우터 플랫폼 개발
유광석(Kwang-Seok Ryoo),서인호(In-Ho Seo),신재흥(Jae-Heung Shin) 대한전기학회 2017 전기학회논문지 P Vol.66 No.4
Until now, a study on a ubiquitous sensor network has been mainly concentrated in the areas of sensor nodes, and as a results, technologies related with sensor node were greatly developed. Despite of many achievements on research and development for a sensor node, a ubiquitous sensor network may failed to establish the actual service environment because variety of restrictions. In order to provide a actual service using a ubiquitous sensor networks applied to many results on research and development for a sensor nodes, a study on a wired/wireless composite router must be carried out. However a study on a wired/wireless composite router is relatively very slow compared with the sensor node. In this study, developed a high-performance router platform supporting IPv6 that can provide high-speed wired/wireless interface and QoS, and it can provide the multimedia service Interlocking the wireless sensor network and the Internet network. To analysis a given network environment and to develop the appropriate hardware and software in accordance with this requirement.
칼라 이미지 데이타베이스에서 Region Vector를 이용한 내용기반 이미지 검색
장석환(Seok Hwan Jang),유광석(Kwang Seok Ryoo),김회율(Whoi Yul Kim) 한국정보과학회 1997 한국정보과학회 학술발표논문집 Vol.24 No.2Ⅰ
본 논문에서는 Region Vector를 이용하여 유사한 칼라이미지를 검색하는 방법을 제안한다. Region Vector는 칼라 히스토그램, 각각의 색깔에 따른 위치정보 및 모멘트값을 내포하는 것으로 정의 된다. 이 방법은 히스토그램이 가지고 있는 위치정보의 부재로 인하여 발생할 수 있는 정확률의 저하를 감소시킨다. 100여개의 표본 이미지상에서 실험을 통해 Region Vector의 효율성을 보인다.
이동호,유광석,김희율 한국방송공학회 2000 방송공학회논문지 Vol.5 No.1
In this paper, we propose a new composite feature consists of both color and shape information that are suitable for the task of character image retrieval. This approach extracts shape-based information using Zernike moments from Y image in YCbCr color space. Zernike moments can extract shape-based features that are invariant to rotation, translation, and scaling. We also extract color-based information from the DCT coefficients of Cr and Cb image This approach is good method reflecting human visual property and is suitable for web application such as large image database system and animation because higher retrieval rate has been achieved using only 36 features. In experiment, this method is applied to 3,834 character images. We confirmed that this approach brought about excellent effects by ANMRR(Average of Normalized Modified Retrieval Rank), which is used in the evaluation measure of MPEG-7 color descriptor and BEP(Bull's Eye Performance), which is used in evaluation measure of shape descriptor in character image retrieval.