• Title/Summary/Keyword: Distributed Multimedia

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Dynamic Multi-frame Transmission Technology Using the WiMedia MAC for Multi-hop N-screen Services

  • Hur, Kyeong
    • Journal of information and communication convergence engineering
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    • v.14 no.1
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    • pp.21-25
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    • 2016
  • N-screen is a promising technology to improve support for multimedia multicasting, content sharing, content mobility, media scalability, and seamless mobility. In this paper, the WiMedia distributed-MAC (D-MAC) protocol is adopted for development of a seamless N-screen wireless service. Furthermore, to provide a multi-hop, one source multi-use N-screen service through point to point streaming in a seamless D-MAC protocol, a dynamic multi-frame transmission technology is proposed. In this technology, a dynamic time slot allocation scheme and a multi-hop resource reservation scheme are combined. In the proposed dynamic time slot allocation scheme, two thresholds, a hard threshold and a soft threshold, are included to satisfy the power consumption and delay requirements. A multi-frame DRP reservation scheme is proposed to minimize end-to-end delay during the multi-hop transmissions between N-screen devices. The proposed dynamic multi-frame transmission scheme enhances N-screen performance in terms of the multi-hop link establishment success rate and link establishment time compared to the conventional WiMedia D-MAC system.

Distributed Satellite Data Center via Network

  • Takagi, Mikio
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 1996.06b
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    • pp.1-6
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    • 1996
  • To promote academic researches on earth environment utilizing satellite data, research infrastructure such as satellite data reception processing, distribution and archival systems should be fully provided. The means to enhance the infrastructure were discussed by a working group and“Satellite Data Center via Network”has been proposed. This concept has three principles; (1) To realize necessary functions by organizing experts distributed all over Japan and connecting them by network, (2) To realize“Satellite Data Center via Network”for GMS and NOAA Satellites, which are widely used for research, and (3) Satellite data set oriented to specific research area should be generated by researchers having definite research purposes of sensor algorithms and hugh volume data processing. Utilization of the Science Information Network (SINET) has been discussed to realize this concept, and to accelerate this project an experiment“Network Utilization for Wide Area Use of Satellite Image Data”under“Cooperative Experiment on Multimedia Communication”has been introduced. And the roles of the Institute of Industrial Science, University of Tokyo to contribute this project has been described.

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Design and Implementation of a Telemedicine System based on Distributed Multimedia (분산 멀티미디어 기반의 원격의료시스템 설계 및 구현)

  • 이병수;안영두;박두석
    • Journal of the Korea Society of Computer and Information
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    • v.5 no.2
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    • pp.81-89
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    • 2000
  • In this thesis. we. present a Telemedicine System that uses the communication network as the 2s6kbps exclusive line or 10Mbps Ethernet LAN. This system can make it possible for remote hospital or doctor to search and retrieve medical images and information from the central hospitals the have advanced technologies, and to support Teleconsulting with medical experts. To solve the speed limits. JPEG compression method and Distributed system used.

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A Study on Hybrid Database Integration Model for Product Data Management (PDM을 위한 하이브리드 데이터베이스 통합 모델에 관한 연구)

  • Lee, Kang-Chan;Lee, Sang;Yoo, Jung-Yeon;Lee, Kyu-Chul
    • The Journal of Society for e-Business Studies
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    • v.3 no.1
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    • pp.23-41
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    • 1998
  • In a centralized database system, all system components reside at a single platform. In recent years there has been a rapid trend toward the integration of information systems over multiple sites that are interconnected via a communication network, and users' needs are changed to integration of multiple information sites. Multi database System is one of solutions for integrating distributed heterogeneous databases. However the problems in multi database system are restriction in distributed environment support, limitation in integrating heterogeneous media type data, static integration, and data-only of integration. In order to solve these problems, we propose a hybrid database integration model, HyDIM. HyDIM is used for the integrating legacy multimedia data, adopting CORBA, MDS, and mediator. We demonstrate a prototype system far PDM application domain.

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Implementation of a Windows NT Based Stream Server for Multimedia School Systems (멀티미디어 교실을 위한 윈도우 NT 기반 스트림 서버 구현)

  • 손주영
    • Journal of Korea Multimedia Society
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    • v.2 no.3
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    • pp.277-288
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    • 1999
  • A distributed multimedia school system is developed for the multimedia classroom at high school and university. The system is designed and implemented for students to improve the learning efficiency through the personalized multimedia contents and pace of learning. The previously developed multimedia information retrieval systems have some limitations on being applied to the multimedia classroom: expensive cost per stream or poor retrieval quality inappropriate for education, unscalability of system and service, unfamiliar proprietary client environment, and difficulty for teachers to use the authoring tools and manage the authored teaching materials. The system we developed overcomes the above problems. It is so scalable as to be applicable not only to a segmented classroom but also to the world wide Internet. The stream server is one of the components of the system: stream servers clients, a service gateway system, and a authoring management system. This paper describes the design and implementation of the stream server. A single stream server can simultaneously playback the multimedia streams as many as clients at one classroom. This is achieved only by the software engine without any changes of the hardware architecture. The systematic coupling with other components gives the scalability of the system and the flexibility of services.

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A Distributed Low-cost Dynamic Multicast Routing Algorithm with Delay Constraints (지연시간을 고려한 최소비용의 동적 멀티캐스트 라우팅 알고리즘)

  • Sin, Min-U;Im, Hyeong-Seok
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.39 no.4
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    • pp.180-187
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    • 2002
  • Many real-time multimedia applications, such as video conferencing have stringent end-to-end delay constraints and consume large amount of network resources. In order to support these applications efficiently, multicast routing algorithms computing least cost multicast trees that satisfy a given end-to-end delay constraint are needed. However, finding such a tree is known to be computationally expensive. Therefore, we propose a heuristic distributed multicast routing algorithm that reduces a “finding multicast tree”that satisfies a given end-to-end delay constraint and minimizes the average resulting tree cost. Also, simulation results show that the proposed algorithm has much better average cost performance than other existing algorithms.

Design of Network Protocols for Distributed Virtual Environments (분산 가상 환경을 위한 네트워크 프로토콜의 설계)

  • Ko, Dong-Il;Choi, Yang-Hee
    • Journal of KIISE:Information Networking
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    • v.27 no.1
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    • pp.1-11
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    • 2000
  • Recently, the explosive popularity of Internet gave birth to researches on Distributed Virtual Environments(DVE). They aim at providing a shared application data environment at realtime for users participating in the same application session across Internet. As more users join the session, and as more multimedia data are shared, because of network resource limitation, it is more difficult to maintain the quality of DVE, such as users' satisfaction level. Previous works mainly tried to solve the scalability, synchronization and data transport issues at the application level, with limited success. We suggest a new network centric solution, that consists of a novel network architecture and protocols upon which any large-scale DVE application can be easily developed. The performance of the proposed scheme, called GAIA, is verified by simulation.

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Distributed Algorithm for Maximal Weighted Independent Set Problem in Wireless Network (무선통신망의 최대 가중치 독립집합 문제에 관한 분산형 알고리즘)

  • Lee, Sang-Un
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.19 no.5
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    • pp.73-78
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    • 2019
  • This paper proposes polynomial-time rule for maximum weighted independent set(MWIS) problem that is well known NP-hard. The well known distributed algorithm selects the maximum weighted node as a element of independent set in a local. But the merged independent nodes with less weighted nodes have more weights than maximum weighted node are frequently occur. In this case, existing algorithm fails to get the optimal solution. To deal with these problems, this paper constructs maximum weighted independent set in local area. Application result of proposed algorithm to various networks, this algorithm can be get the optimal solution that fail to existing algorithm.

Service Management Technique for Efficient Continuos Media Transmission in ATM-specific Distributed Multimedia -On-Demand System (ATM 환경의 분산 MOD 시스템에서 효율적인 CM전송을 위한 서비스 관리 기법)

  • 박세준;이근왕;오해석
    • Proceedings of the Korean Information Science Society Conference
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    • 1998.10a
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    • pp.314-316
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    • 1998
  • 본 논문에서는 ATM-LAN상 MOD서버에서 클라이언트로의 CM데이처의 전송 기술을 위한 서비스 관리 기법을 제안한다. 즉, Navigation서버를 이용한 브라우징 메카니즘, 서버와 클라이언트, 응용 AAL과 QoS간 협상 및 예약 정차의 세션 설정 기술, 프레임의 분열 및 재결합에 관한 알고리즘을 제안하고 구현한다.

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Synchronization Technique using Dynamic Check of Network in Distributed Multimedia Presentations (분산 멀티미디어 프리젠테이션에서 네트워크 동적 검사를 이용한 동기화 기법)

  • 최숙영
    • Proceedings of the Korea Society for Industrial Systems Conference
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    • 2000.05a
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    • pp.213-220
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    • 2000
  • 효과적인 프리젠테이션을 위해서는 동기화가 지원되어야 하며, 특히, 분산 환경에서의 프리젠테이션은 네트워크 대역폭과 지연시간 등에 의해 영향을 받기 때문에, 그러한 요소들이 고려되어 동기화가 지원되어야 한다. 본 연구에서는 미디어들이 각 서버로부터 전송 될 때 네트워크의 상태와 자원을 검사하여 그에 따른 변화를 서버에 피드백시켜, 서버로부터 전송되는 데이터의 양을 조절함으로서 동기화를 지원하는 분산 멀티미디어 프리젠테이션 모델을 제안한다.

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