• Digital Contents
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• no.3 s.118
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• pp.129-133
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• 2003

트래픽 관리를 위한 요소기술로 '캐시서버'에 대한 내용을 지난 호에 살펴보았다. 이번에는 트래픽을 효과적으로 분산시켜 줄 수 있는 글로벌 로드밸런싱(Global Server Load Balancing)에 대해 살펴보겠다.'글로벌 로드밸런싱'은 미들마일 구간의 병목지역을 회피하기 위해 서버를 여러 지역에 설치해 운영할 때, 사용자들이 분산 운영되고 있는 서버들 가운데 부하가 적고, 사용자로부터 근접한 서버로 유도하는 기술이다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2006.05a
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• pp.577-580
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• 2006

The rapidly growth of Internet is main factor that activates the Digital Contents market. However imprudent Digital Contents market could be shrunk by imprudent illegal copy and delivery. MPEG(Moving Picture Experts Group) proposed MPEG-21 Multimedia frameworks in order to solve these problem. IPMP is parts of MPEG-21 Multimedia Frameworks, when Digital Contents goes through production delivery consumption, which defines standard to keep the Digital Contents in safety. Currently IPMP defined by FCD(Final Committee Draft) level. Therefore development of system which applied to latest standard to protect and manage the Digital Contents is required. and the system consists of fourth organizations which means Metadata Production server, Tool server, License server, Consumption server. In this Paper, we made production server to parse REL(Rights Expression Language) document that has right information for content from license server, and create metadata based on MPEG-21 IPMP about the content that applied to watermark. then, after it do remuxing, transmit the protected data to consumption server.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.04a
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• pp.1173-1175
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• 2011

국내의 인구는 고령화와 함께 의료비 지출이 늘어나는 것은 혈압이나 당뇨와 같은 만성질환자 환자 비중이 높아졌기 때문이며 의료비의 절감 및 건강관리 향상을 위하여 본 연구에서는 스마트폰 점유율이 높은 안드로이드 OS를 기반으로 하여 건강관리 콘텐츠를 제공 하는 앱을 설계 하였다. 설계한 앱은 혈압계, 심전도 기기, 혈당계, 전자청진기 등을 이용하여 사용자가 자신의 건강상태를 안드로이드 기기에 전달하여 서버에 저장 하는 구동절차를 가지고 있으며, 서버에서는 LOG 정보를 이용하여 사용자가 원하는 서비스 요청을 통하여 사용자에게 맞는 건강관리 콘텐츠를 전달한다.

• Digital Contents
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• no.5 s.72
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• pp.10-12
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• 1999

클라이언트 서버 환경의 아키텍처로 대변되는 분산처리 환경의 최대 문제점은 관리에 어려움이 있다는 것이다. 이를 보완하기 위해 많은 관리 소프트웨어가 등장했으며 DB관리 툴 또한 분산 처리 환경에서 효과적인 DB관리와 최적화를 위해 개발된 소프트웨어이다. DB관리 툴의 필요성 및 역할에 대해 살펴봤다.

• Journal of Broadcast Engineering
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• v.20 no.4
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• pp.619-631
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• 2015

In this paper, we propose a new online content editing system to edit the broadcasting and personal contents. The proposed editing system consists of the content management server and the content editor, in which the content management server is used for storing the contents, while the content editor is used for editing the contents via the user interface. Unlike the existing content editing methods which edit the downloaded contents, the proposed editing system edits the contents stored in the content management server while the content editor plays them by using the streaming technology. However, it is not effective to edit the whole segments of contents while playing them by using the streaming technology. To resolve the problem, the proposed editing system performs the scene detection of the contents, and the detected scene information is used for playing and editing of contents. After completing the content editing, the edited information is uploaded to the content management server as a metadata format. In the proposed editing system, both scene and edited information are represented only as the metadata format, and the physical content segmentation according to the scene and edited information is not performed. The implementation results show that the proposed editing system provides similar performances with the existing content editing methods which use the content download and editing methods.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.1
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• pp.68-75
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• 2013

Recently IPTV that transmits multimedia contents in real time through internet, cable TV net and satelite net gets the limelight. But IPTV service that gives service to users by various media has a problem of not supporting user certification fully. This paper suggests a certification model which prevents getting access permission of IPTV service by sending illegal certification information by adolescent through integrating mobile communication technique with RFID(Radio Frequency IDentification) technique which is a key technique of Ubiquitous environment. This model performs the process of adult certification by keeping synchronization with user's certificaiton information that is saved in data-base of certification server and contents server after getting the system of class categorization in contents server to overcome disadvantage of simple adult certification system that is popular in the existing internet. Also, it adapts double hash chain technique not to down load illegally contents without the permission of manager even if an adolescent gets manager's approval key.

• Journal of Internet Computing and Services
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• v.11 no.5
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• pp.9-17
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• 2010

During the last decade, Internet protocol television(IPTV), broadcasting of multimedia services using well understood Internet technologies, is a fast spreading technology for distributing multimedia content to consumers. As IPTV services advance, an increasing user demand and tremendous content volume of multimedia content cause some difficulties in network resource management. In this paper, we propose an improved load balancing algorithm for video-on-demand(VoD) service. Unlike existing algorithms, the proposed algorithm considers user's behaviors for VoD service, and determines the most efficient allocation of VoD requests by estimating expected server load and expected user waiting time.

• Journal of KIISE:Computing Practices and Letters
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• v.13 no.6
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• pp.343-357
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• 2007

In this paper, we propose the techniques for effective management of profiles that necessary to provide adaptation content to an user. The profiles must be configured the related information of the user and can be exchanged according to periodic/aperiodic or event among user device, profile repository, contents adaptation server and contents storage server for providing adaptation content to an user. The profiles also must be supplied the contents services providers that need profiles for the adapted contents services. To support those function, we propose the management technologies of profiles and design profile framework supporting those. The proposed management framework of profiles is supported the profiles that are configurated using the various user's information and is used the Web Services for exchanging and providing regardless of the various devices and platform. The dynamic configuration method, metadata configuration method, and profiles providing methods using weight for effective management in the framework also are applied. The result of evaluation the proposed management techniques show effective profiles processing.

• Review of KIISC
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• v.14 no.6
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• pp.75-81
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• 2004

본 논문은 MPEG-2 스트리밍 콘텐츠에 대한 보호와 사용권한을 관리하는 DRM 시스템을 제안한다. 본 논문은 스트리밍 콘텐츠에 대한 암호화를 통하여 콘텐츠론 보호하고 사용자에게 스트리밍 서비스에 대한 권리와 암호화된 스트리밍 콘텐츠를 복호화하기 위한 키를 안전하게 전단하기 위한 저작권 관리 방법을 제안한다. 본 논문에서 제안하는 MPEG-2 암호화 방안은 암호화된 MPEG-2 스트리밍 콘텐츠가 스트리밍 서버의 성능에 영향을 미치지 않도록 하며 DRM 적용으로 인한 스트리밍 클라이언트에서의 부하가 최소화될 수 있도록 한다.

• Journal of Digital Contents Society
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• v.19 no.1
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• pp.43-49
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• 2018

Recently, with the rapid increasing demands for data services on the Internet, the need for large-scale data centers has been increased. However, these data centers consume enormous amounts of energy to run numerous servers and equipment. In this paper, we therefore propose a novel scheme to save energy in multimedia servers by concentrating the load on specific servers according to the current load level of the overall system and turning them off immediately. To this end, the number of server groups in which each video is stored is determined according to its popularity so that video playback requests can be evenly distributed to the entire system. Finally, through extensive simulations, we show that our proposed data placement and power management scheme in multimedia servers significantly reduces energy consumption by decreasing the number of servers whose powers are on when compared with the existing method, while maintaining the service quality.