• Proceedings of the Optical Society of Korea Conference
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• 2001.02a
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• pp.62-63
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• 2001

We studied a method to use a variable discrete random phase mask in 2-D binary data representation for efficient holographic data storage. The variable phase mask is realized by use of a liquid crystal display.

• Proceedings of the Korea Database Society Conference
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• 1998.09a
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• pp.245-271
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• 1998

■ 멀티미디어컨텐트의 정의 $\bigcirc$ 멀티미디어컨텐트란 문자, 음성, 화상, 데이터, 영상 등 다양한 정보형태가 디지털화되고 통합되어 정보기기로 생산, 유통, 활용되는 정보 내용물과 양방향성이 추가되어 정보 통신망을 통해 송ㆍ수신되는 정보 내용물을 지칭(중략)

• Proceedings of the Korea Database Society Conference
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• 1999.10a
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• pp.235-242
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• 1999

멀티미디어 컨텐트 개발에 필수적인 3차원 모델, 2차원 이미지, 동영상, 특수음향 등의 개발재료를 체계적으로 분류ㆍ구축하여 국내 멀티미디어 개발업체에 양질의 제작물을 개발하는데 필수적인 재료를 저가에 공급함으로서 - 국내 개발업체의 개발경비 절감 및 개발시간 단축 (중략)

• Proceedings of the Korea Database Society Conference
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• 1999.10a
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• pp.1-11
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• 1999

o 디지털컨텐츠(멀티미디어컨텐츠)란 무엇인가\ulcorner 멀티미디어 : 기존 아날로그 기술에서 개별적으로 성장했던 문자, 음성, 사진, 비디오, 애니메이션의 미디어 영역들이 디지털 기술이 발달하면서 통합된 미디어를 말함. 디지털화는 글, 소리, 그림, 영상, 숫자 등의 온갖 정보들을 컴퓨터가 인식할 수 있는 신호(2진수 코드)로 바꾸는 것임. (중략)

• Journal of the Korean Institute of Intelligent Systems
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• v.6 no.3
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• pp.81-88
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• 1996

Cluster analysis is based on partitioning a collection of data points into a number of clusters, where the data points in side a cluster have a certain degree of similarity and it is a fundamental process of data analysis. So, it has been playing an important role in solving many problems in pattern recognition and image processing. For these many clustering algorithms depending on distance criteria have been developed and fuzzy set theory has been introduced to reflect the description of real data, where boundaries might be fuzzy. If fuzzy cluster analysis is tomake a significant contribution to engineering applications, much more attention must be paid to fundamental questions of cluster validity problem which is how well it has identified the structure that is present in the data. Several validity functionals such as partition coefficient, claasification entropy and proportion exponent, have been used for measuring validity mathematically. But the issue of cluster validity involves complex aspects, it is difficult to measure it with one measuring function as the conventional study. In this paper, we propose four performance indices and the way to measure the quality of clustering formed by given learning strategy.

• Journal of KIISE:Computing Practices and Letters
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• v.9 no.2
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• pp.158-165
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• 2003

Image similarity is often decided by computing the distance between two feature vectors. Unfortunately, the feature vector cannot always reflect the notion of similarity in human perception. Therefore, most current image retrieval systems use weights measuring the importance of each feature. In this paper new initial weight selection and update rules are proposed for image retrieval purpose. In order to obtain the purpose, database images are first divided into groups based on human perception and, inner and outer query are performed, and, then, optimal feature weights for each database images are computed through searching the group where the result images among retrieved images are belong. Experimental results on 2000 images show the performance of proposed algorithm.

• The Transactions of the Korea Information Processing Society
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• v.4 no.2
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• pp.363-376
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• 1997

In this paper, we present a hardware architecture and a sofrware architecture for cimputer based teleconferencing systems.And also we analyse stream adtivation mechanisms for them form the viewpoint of delay. MuX that is a multimedia I/O server provides various processing elements for data I/O, synchronization, interleaving and mixing.We describe methods to build teleconferencing systems with the elements and compares the technique using master click with the techniquie using self clock.In the plase of dta input.the technique using self click is berrer than the technique using master clock.When we generate interleved stream from audio and video stream and activate channel objects by periodic audio stream as activation clock, dealy from imput audio stream to imterleved stream is reduced but delay for video stream is not reduced as much as in the case of audio stream.

• Journal of KIISE:Computing Practices and Letters
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• v.7 no.4
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• pp.317-323
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• 2001

DICOM(Digital Imaging and Communications in MediCine), standard of medical image operation, present the methods for communications and Storage of Medical Image. medical image acquired from patient in hospital made DICOM files. this paper purposes design and implementation methodologies of a web-based medical information system that consists of DICOM (Digital Imaging and Communications in Medicine) databases and functional components of a web server in order to support the access of medical information with Intemet web browser. we store the patient and image information to database using reading the group and element oJ DICOM file. we made file transfer module by implementing DICOM Store service, in result, we can transfer DICOM file to IF based host or computer. We compose web component of communications and Storage service, user be used DICOM Service by web Browser.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.10
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• pp.2691-2695
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• 2009

Nowadays Fiber optical communication systems have limitless bandwidth and can be used for transmitting various multimedia data with in real time. It is necessary to construct integrated service systems that can be used in our society whole to communicate multimedia data such as text, image, audio and video data in fiber optic communication systems. In this paper, we have designed and constructed the fiber optical link application system for multi-video/audio data transmission using only one core optical cable upgrading previous fiber optical communication systems based on WDM (Wavelength Division Multiplexer). Using the proposed fiber optical link application system enables us to managing fiber optical communication systems with only one core optical cable using WDM (Wavelength Division Multiplexer) and DEWDM/Wavelength splitter.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.17 no.4
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• pp.346-360
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• 1992

This paper proposed a method of identity decision of moving object by the fuzzy inference. Moving object is extracted by the difference picture method and identity decision parameters of moving object are chosen area, perimeter. A/p ratio and vertex. In the brightness variation of 600 Lux-1600Lux, we determined the maximum error often parameters and then generated a fuzzified data. Fuzzified data are generated from the reference image and then decided the identity of extracted parameter by the fuzzy inference using fuzzy production rule. In order to verify validity of proposed method, experiment are performed with a toy car. As a result, it was shown that decision error was less than 4%