• Title/Summary/Keyword: 멀티미디어 메시지 서비스

Search Result 141, Processing Time 0.029 seconds

Performance Evaluation of the RSVP-capable Router using Latency-Optimized Fair Queuing Scheduler (최적 레이턴시 기반 공정 큐잉 스케줄러를 사용하는 RSVP-라우터의 성능 평가)

  • Kim, Tae-Joon
    • Journal of Korea Multimedia Society
    • /
    • v.11 no.11
    • /
    • pp.1536-1546
    • /
    • 2008
  • RSVP-capable router supporting guaranteed services on the internet generally uses a packet scheduler based on the Weighted Fair Queuing (WFQ) algorithm to secure required qualities of traffic flows. A RSVP-capable router based on the LOFQ (Latency optimized fair queuing) algorithm had been proposed to improve the performance of the WFQ-based RSVP-router, but it required not only the RESV message to be expanded but also its performance could be evaluated only through simulation. This paper proposed a LOFQ based RSVP-capable router using the conventional RESV message and developed an algorithm to analyze the performance of the LOFQ based RSVP-capable routers. The performance evaluation using the developed algorithm showed that in terms of performance improvement the proposed router is inferior to the one using the expanded RESV message under a small packet size, but on the range of a large packet size both routers provide the same improvement.

  • PDF

Design for the Multimedia Messaging Engine for Electronic Traffic Administration Services (전자교통행정서비스를 위한 멀티미디어 메시징 엔진의 설계)

  • Kung Sang-Hwan;Koh Hyon-Hee
    • The Journal of the Korea Contents Association
    • /
    • v.5 no.6
    • /
    • pp.10-19
    • /
    • 2005
  • It may not be strange to anticipate that the forth-coming epoch of electronic government would bring us lots of convenience on account of ubiquitous environment with mobile devices. Such environment enables us to access the up-to-date information anytime and also a worker to carry out administration services to perform one's line of duty at anytime with electronic, handy devices such as PDA. What we now recognize from the field of electronic traffic administration services is that the office work flow as well as the public services has been remarkably improved by using of not only text but video and image information under the distributed, mobile environment. One of key requirements of this kinds of services is the feature of exchanging various information among multiple information publishers and subscribers. We call this feature Messaging Services generally The study in this paper focuses on the architecture design of the Messaging Engine software, complying with the pattern-oriented software architecture design methodology. And our contribution also goes to the discovery of three architecture patterns found in the design process and the efficient multi-threading architecture compared to one of the Messaging Engine solutions.

  • PDF

A Research on Streaming Link Channel Handler between HAVi and Jini Services (HAVi와 Jini 서비스간의 스트리밍 채널 연결 기법에 관한 연구)

  • Park, Dong-Hwan;Ku, Tae-Yeon;Park, Kwang-Roh
    • Proceedings of the Korea Information Processing Society Conference
    • /
    • 2003.11b
    • /
    • pp.1285-1288
    • /
    • 2003
  • IEEE1394 를 하부 프로토콜로 사용하는 HAVi 는 TCP/IP 를 기반으로 하는 Jini 보다 멀티미디어 데이터의 전송에 효과적이다. HAVi 는 IEEE1394 를 기반으로 하는 네트웍에 적용될 수 있으며, 이들 기기간의 메시지 전송과 스트리밍 자원 관리, 네트웍 관리, 이벤트 관리등을 수행할 수 있도록 제안된 홈 네트웍 미들웨어이다. 반면, Jini 는 TCP/IP 기반의 분산 컴퓨팅 기술로 동적으로 네트웍에 연결된 서비스에 대해 검색하여 제공하는 서비스를 언제 어디서나 받을 수 있도록 하는 기술이다. Jini 는 자바기술에 기반을 둠으로써, 플랫폼 독립적인 특성과 코드의 이동성이 보장되며 데이터 기반의 분산 홈 네트웍 기술에 적용되어 연구되고 있다. 디지털 홈 미들웨어에서 서로 적용 분야와 네트웍 미디어가 다른 HAVi 와 Jini 사이에 스트리밍 데이터의 교환을 위해 본 논문에서는 Jini Lookup Source 에서 IEEE1394 와 TCP/IP 간의 스트리밍 서비스의 효과적인 연결을 위한 채널링 기법을 제안한다.

  • PDF

A Study on Countermeasure for CCN Interest Flooding Attack (콘텐츠 중심 네트워킹 환경에서의 Interest Packet Flooding 대응 연구)

  • Kim, DaeYoub
    • Journal of Korea Multimedia Society
    • /
    • v.16 no.8
    • /
    • pp.954-961
    • /
    • 2013
  • To enhance the efficiency of network, content-centric networking (CCN), one of future Internet architectures, allows network nodes to temporally cache transmitted contents and then to directly respond to request messages which are relevant to previously cached contents. Also, since CCN uses a hierarchical content-name, not a host identity like source/destination IP address, for request/response packet routing and CCN request message does not include requester's information for privacy protection, contents-providers/ network nodes can not identify practical requesters sending request messages. So to send back relevant contents, network nodes in CCN records both a request message and its incoming interfaces on Pending Interest Table (PIT). Then the devices refer PIT to return back a response message. If PIT is exhausted, the device can not normally handle request/response messages anymore. Hence, it is needed to detect/react attack to exhaust PIT. Hence, in this paper, we propose improved detection/reaction schemes against attacks to exhaust PIT. In practice, for fine-grained control, this proposal is applied to each incoming interface. Also, we propose the message framework to control attack traffic and evaluate the performance of our proposal.

Efficient Multicast Routing Scheme at Mobile Environment using Regional Registration (이동 환경에서의 지역적 등록을 이용한 효과적인 멀티캐스트 라우팅 방법)

  • 박태현;김철순;곽경섭
    • Journal of Korea Multimedia Society
    • /
    • v.6 no.7
    • /
    • pp.1231-1238
    • /
    • 2003
  • As the demand on multicast services increases to support the terminal mobility in the midst of the development of wireless mobile communication technology, many new methods have been studied. However, previous methods occur delay and packet loss during re-joining to multicast service group when moving mobile node. In this paper, we will propose a scheme that decreases packet loss using regional registration method. Proposed scheme modified signaling message of previous regional-registration and added caching. In case move to same GFA, we can prevent packet loss by keeping registration to FA until perfectly registration ends. Also, In case move to other GFA, we can reduce packet loss by using cache. Therefore, we can receive efficient multicast service.

  • PDF

Fast and Secure Handoff Mechanism for Mobile IPv6 based on IEEE 802.11 (IEEE 802.11 기반의 고속의 안전한 Mobile IPv6 핸드오프 메커니즘)

  • Kang, Hyun-Sun;Park, Chang-Seop
    • Journal of Korea Multimedia Society
    • /
    • v.13 no.2
    • /
    • pp.205-215
    • /
    • 2010
  • It is necessary to provide a fast and secure handover for seamless real-time multimedia services based on IEEE 802.11. In this paper, we propose FMIPv6 handoff protocol integrating L2/L3 layer based on IEEE 802.11 WLAN environment. In that, we propose a hierarchical key management scheme and authentication mechanism for protecting the handover signaling messages. The number of connections with AAA server is minimized for the fast handover. It is also compared and analyzed the handover cost with previous method.

A Design of Sensor Web service Framework for Wireless Sensor Networks Environment (무선 센서 네트워크 환경에 대한 센서 웹 서비스 프레임워크의 설계)

  • Kim, Yong-Tae;Jeong, Yoon-Su;Park, Byung-Joo;Park, Gil-Cheol
    • Journal of the Korea Society of Computer and Information
    • /
    • v.14 no.10
    • /
    • pp.123-131
    • /
    • 2009
  • In this paper, we design ZigBee RF based framework for mobile web service on collected data by sensor node and transmitting data to data base by sensor network and remote sensing server through wireless connection. The proposed system is an integrated platform of sensor network for the sensor management and providing SOA based sensor web access. This paper combines SOA technology with sensor network. composes sensor node as web view, and provides high capability. extensiveness, reliability, and usability to the user who accesses to sensor web. The mobile message conversion module, SOAP message processing module. WSDL message generator, and mobile web service module is embodied for improving the capacity of the framework. The capacity evaluation of local wireless communication system which is proposed in this paper is analyzed through NS-2 simulation.

A Fault-tolerant Network-based Mobility Management Scheme for Supporting Multi-media Services (방통융합 멀티미디어 서비스를 제공하기 위한 안정된 네트워크 기반의 이동성 관리 기술)

  • Lee, Sung-Kuen;Lee, Kyoung-Hee;Hong, Kang-Woon;Um, Tai-Won;Lee, Hyun-Woo;Ryu, Won;Park, Jin-Woo
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.35 no.3B
    • /
    • pp.526-535
    • /
    • 2010
  • In this paper, we propose the fault-tolerant network-based mobility management scheme for supporting multimedia services of broadcasting & communications convergence in fixed mobile convergence (FMC) networks. The proposed scheme is based on AIMS (Access Independent Mobility Service) which is developed for the mobility support among heterogeneous access networks. To support stable location management and handover control for a MN, the proposed scheme supports stable management of binding information by sensing network attachment and detachment of a mobile node (MN). In addition, the proposed fault-tolerant (FT) AIMS supports a function of message retransmission for the support of handover control message and a function of heartbeat message transmission for the support of stable access network environments to a mobile node. We evaluate and analyze the performance of the proposed scheme through the implementation of AIMS system test-bed.

A GroupKey Distribution Mechanism using Efficient Key Update Message in Mobile Network Environments. (모바일 네트워크 환경에서 효율적인 키 갱신메시지 전달을 이용한 그룹키 분배 기법)

  • Ahn, Byeonguk;Kim, Kangseok;Yeh, Hongjin
    • Proceedings of the Korea Information Processing Society Conference
    • /
    • 2011.11a
    • /
    • pp.900-902
    • /
    • 2011
  • 모바일 기기와 무선통신의 발달로 모바일 기기를 대상으로 하는 다양한 종류의 멀티캐스트 네트워크 기반 멀티미디어 서비스가 증가하고 있다. 이러한 멀티캐스트 통신 환경에서 보안성을 제공하기 위해 사용되는 그룹키를 전달하고 관리하는 것이 중요한 문제가 되고 있다. 또한 연구도 꾸준히 진행 되고 있으며, 본 논문은 기존연구(LKH)를 바탕으로 상대적으로 대역폭이 적은 모바일 환경에서 키-인덱스를 이용하여 키를 갱신하고 동기화하는 메시지의 양을 줄이는 방법을 제시한다.

Design and Evaluation of Simplified IKE Protocol (단순화된 IKE 프로토콜의 설계)

  • 윤희준;김형국;최준욱;김재영;정선화;박석천
    • Proceedings of the Korea Multimedia Society Conference
    • /
    • 2003.11b
    • /
    • pp.719-722
    • /
    • 2003
  • IP 기반에서 보안 서비스를 제공하는 IPsec은 IP 패킷에 대한 기밀성과 무결성 그리고 인증과 같은 보안 서비스를 제공하는 국제 표준 프로토콜이며, IPsec의 키 관리 프로토콜은 IKE이다. 그러나 기존의 IKE 프로토콜은 구현이 복잡하고 1단계와 2단계의 SA 설정에 총 9번의 과다한 메시지 교환으로 인해 실제 시스템간의 상호 운용성이 떨어질 뿐만 아니라 기존 시스템의 성능을 저하시키는 단점이 꾸준히 제기되어 왔다. 또한 서비스 거부 공격에 대해 매우 취약한 구조를 가지고 있다. 따라서 본 논문에서는 이를 해결하기 위해 IKE가 가지고 있는 대부분의 특징과 속성을 유지하면서 프로토콜을 단순화하고 효율성과 안전성, 유연성을 증대시킬 수 있도록 기존 IKE 프로토콜을 개선하여 단순화된 IKE 프로토콜을 설계하였다.

  • PDF