• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.4
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• pp.638-644
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• 2006

In this paper, a QT_ss protocol is proposed for identifying all the tags within the identification range. The proposed QT_ss protocol revises the QT protocol, which has a memoryless property. In the QT_ss protocol, the tag will send all the bits of their identification codes when the query string matches the first bits of their identification codes. While the tags are sending their identification codes, if the reader detects a collision bit, it will send a signal to the tags to stop sending. According to the simulation results, the QT_ss protocol outperforms the QT protocol in terms of the number of response bits.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2006.05a
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• pp.526-529
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• 2006

In this paper, a QT_ss protocol is proposed for identifying all the tags within the identification range. The proposed QT_ss protocol revises the QT protocol. which has a memoryless property. In the QT_ss protocol, the tag will send all the bits of their identification codes when the query string matches the first bits of their identification codes. While the tags are sending their identification codes. if the reader detects a collision bit, it will send a signal to the tags to stop sending. According to the simulation results, the QT_ss protocol outperforms the QT protocol in terns of the number of response bits.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.22 no.10
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• pp.2219-2235
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• 1997

The endpoints and exchanges involved in a call can establish heterogeneous connection each other according to required bandwidth and bearer availability in multimedia communication. and as participating users are increased, call setup delay must not be exceedingly increased. In this paepr, we propose DMMSP(distributed multiparty multiconnection signaling protocol) which can support heterogeneous connections and multimedia communications. DMMSP gets over a limitation of existing B-ISDN protocol and provides signaling capabilities to support various kinds of conncetions, and each endpint can setup individual connection with bearer availability. Moreover since DMMSP separatively performs call processing in distributed scheme, call setup delay can be minimized. We present call control procedures which can be applied to existing B-ISDN protocol and DMMSP respectively. We take multiparty multimedia conference call as an example thta is applied to the existing B-ISDN protocol and DMMSP, and compare and quantitatively analyze each procedures.

• Proceedings of the Korea Institute of Convergence Signal Processing
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• 2001.06a
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• pp.29-32
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• 2001

This paper describes a development of the integrated controller system for car electrical signal control with CAN communication protocol. The CAN protocol is a robust serial bus system for the control of distributed module in the multiplexed network. After a brief of the main features of the CAN will be addressed, this paper presents the result of the development of the integrated hardware system overall control program.

• Proceedings of the Korean Information Science Society Conference
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• 2002.04a
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• pp.448-450
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• 2002

본 논문은 한국전산원 차세대 인터넷 응용서비스 2차 과제로 선정된 "개인 이동성을 지닌 지능형 웹 컨퍼런스 개발"을 수행함에 따른 결과를 정리했다. 일반적으로 인터넷 전화 프로토콜의 신호 프로토콜로 H.323과 SIP를 사용하고 있다. 최근 들어 H.323의 몇몇 낙제점 때문에 인터넷에 적합한 SIP로 대치되고 있는 상황이다. 그러나 SIP는 기존 H.323과 달리 멀티미디어 컨퍼런스에 관한 신호 프로토콜이 명시 되어 있지 않다. 본 논문에서는 이런 SIP의 문제점을 해결하기 위하여 멀티미디어 컨퍼런스를 위한 SIP 확장에 대해 기술한다.

• The Magazine of the IEIE
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• v.18 no.8
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• pp.32-41
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• 1991

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.9 no.5
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• pp.31-37
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• 2009

In the two-way relay channel, the relay employ Amplify-and-Forward (AF) or Decode-and-Forward (DF) protocol, and broadcast the network-coded signal to both user. In the system, DF protocol provides maximum throughput at low signal to noise ratio(SNR). On the other hand, at high SNR, AF protocol provides maximum throughput. The paper propose active transmission scheme which employ Amplify-and-Forward or Decode-and-Forward protocol based on received SNR at the relay over Two-way relay channel. The optimal threshold is investigated numerically for switching the protocol. Through numerical results, we confirm that the proposed scheme outperforms conventional schemes over two-way relay channel.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.7 no.5
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• pp.925-933
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• 2003

Network is expected to be developed into optical Internet network collected IP layer and optical layer, but GMPLS is risen at the transitional evolution stage because of the present technology level. GMPLS that MPLS is extended and generalized is able to support not only the packet switching device but also the devices which perform switching in time, wavelength, and space domain. To implement the common control plane to these various switching types, GMPLS extends the existing MPLS signaling and routing protocol. In this paper, we describe the overview of GMPLS technology, and then we will refer to the OSPF(Open Shortest Path First), which was used to exchange the status information of link, as the plan of routing extension to exchange the information of various link type, bandwidth, link protection type etc. And also, we describe the definition of new protocol, so called, LMP that is a signaling protocol for solving complex problem which manages hundreds and thousands of links between two nodes. And we will examine and analyze the plan of signaling protocol extension to apply signaling protocol RSVP-TE(Resource Reservation Protocol) for traffic engineering in MPLS to network, and the message objects and formats associated with modified RSVP.

• Proceedings of the KIEE Conference
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• 2004.04a
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• pp.262-265
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• 2004

프로토콜 명세의 검정과 적합성 시험은 프로토콜 개발 과정에서 가장 중요한 부분으로, 명세에 규정되어진 시스템 기능의 정확성을 향상시키는데 사용되는 상호 보완 기술이다. 본 논문에서는 유한상태 레이블 천이시스템(LTS:Labeled Transition System)으로 명세화된 철도 신호제어용 프로토콜 Type 1 모델의 안전성 및 필연성 특성을 모형검사 기법에 의해 검정하였고, 실제적으로 교착상태의 유무나 초기 상태에서 임의의 상태로 도달 가능한지의 검사를 실험적으로 증명하였다. 구현되어진 형식 검정기는 Modal mu-calculus를 사용하며 Modal 논리로 표현된 특성이 명세에 대해 올바른지 아닌지를 검정할 수 있다. 또한 검정되어진 프로토콜 명세로부터 HO(Unique Input Output) 방법fl 의한 적합성 시험 계열 생성 방법을 제시하였다.

• Journal of Internet Computing and Services
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• v.4 no.5
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• pp.77-86
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• 2003

This paper introduces the extension of SIP protocol for Multiparty Conference and the implementation of IP-based Multi-Conference. SIP protocol is a signaling protocol for initiating, modifying and terminating interactive sessions (voice, video, text, application). Multiparty conference system is implemented by RTP protocol for real time transmission and by H.323 for call setup. As H.323 fits into PSTN, it has some problems (call setup delay, hard implementation) for IP applications. IETF developed SIP protocol used for signaling in IP networks. However this SIP protocol doesn't explain signal protocol about multimedia conference, which is different from the existing H.323. So this paper describes the extension of SIP according to SIP Specification and case study for the multimedia conference.