• 한국정보통신설비학회:학술대회논문집
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• 2003.08a
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• pp.123-126
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• 2003

최근 컴퓨터 및 통신 기술의 발전으로 인터넷 전화 서비스가 증가하고 있다. 지금까지의 인터넷 전화 서비스는 1:1 방식의 서비스가 주류를 이루었으나, 점차 다자간 음성 채팅, 원격 강의 등과 같은 N:N 방식의 음성 컨퍼런스 서비스에 대한 수요가 급증하고 있다. 그러나 기존의 음성 컨퍼런스 시스템은 별도의 컨퍼런스 서버 구축, 부하 집중 사용자 수의 증가에 따른 음성 트래픽 증가 등의 문제로 일정한 통화 품질을 유지하기 어렵다는 단점이 있다. 따라서, 본 논문에서는 이와 같은 문제를 개선하기 위한 ad hoc 방식의 음성 컨퍼런스 시스템을 제안하였다. 그리고 이 시스템의 성능 분석을 통하여 최소 4명의 참여자까지 일정한 음성 품질이 보장됨을 확인함으로써 본 논문에서 제안하는 시스템의 타당성을 검증하였다.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.12 no.3
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• pp.224-230
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• 2019

In this paper, a new multiple servers conference service system using media control channel/distributed conference manipulation architecture has been presented. This conference service system can handle loads effectively from many conference participants. In this suggested architecture, media control channels are established between conference server, and distributed conference manipulation messages for distributing system loads are exchanged through this channels. These messages are transported between servers using media control channel created after stable transport sessions, and can be used to process server loads according to participants effectively. So this method can be used to implement large scale conference service system. For these purposes, formats of distributed conference manipulation messages which transmitted through media control channels are designed. and messages exchange procedures between conference servers are also presented. The performance of the proposed conference service system has been analysed by experiments, and the results show that the performances are improved according to participants.

• The Journal of the Korea Contents Association
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• v.6 no.2
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• pp.17-26
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• 2006

SIP(Session Initiation Protocol)-based centralized conference service model has advantage of easiness in conference management and service as compared to other models. However when media server which is one of the components of conference server is included in the conference server, this model shows disadvantage of high server work load with increasing numbers of conferences and participants. In this paper, to improve this problem, we have suggested and implemented a new conference service model in which an UA(User Agent) who first make the conference acts as a media server instead of conventional conference server and, the conference server with conference event package takes only part of management of the conference and its participants. Therefore, many more conferences can be held and managed compared to the conventional centralized conference service model because load of the conference server decreases in our suggested model md, furthermore the participants needs only make SIP call connections to the UA who first make the conference for establishing media session.

• The Journal of the Korea Contents Association
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• v.14 no.7
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• pp.10-17
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• 2014

The focus maintains and manages conference session in the conference service. Load of focus increases by the number of participants and it becomes the major reason that limits the extendability of the large-scale conference service. In this paper, a new distributed focus control method has been proposed to solve this problem. Load of focus has been distributed to several conference nodes to implement large-scale conference service in this architecture. Conference nodes which have focus function subscribe to conference server's conference information database, and focus hae been allocated dynamically to process participants needs according to total numbers of the conference participants. For this purpose a new conference control event package for focus load control has been suggested. Furthermore the exchange procedure of SIP messages between focuses and participants also been suggested. The performance of the proposed system has been evaluated by simulation.

• The Journal of the Korea Contents Association
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• v.5 no.2
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• pp.257-266
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• 2005

As developing of the internet and computer technology, more interests are gathered to the conference service which provides capability of multi-party real-time visual conference. In this paper, we have designed and implemented a SIP-based visual conference system which includes Presence service. The elements of this conference system are user system, which has conference UA(User Agent) capability, presence seuer and conference server. For the presence service, we have adapted publication method which uses SIP PUBLISH message, and with this service various status informations of users are easily acquired. Also invitations and involvements to the conference are easily made through this service. For the conference server which controls establishment and management of multi-party connections, we have included conference event package. This package provides dynamically changing conference informations and users informations through SIP subscription and notification functions.

• Proceedings of the Korea Contents Association Conference
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• 2006.11a
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• pp.584-588
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• 2006

Recently, the conference is increase continuously, and the public relations and administration are increasing. Therefore, the many expense of small academic society and official overhead are generated for supporting the service of conference registration and announcement. Accordingly, in this paper, the building tool designs and implements for the registration and public relations of a small-scale conference on Internet. This tool supports an automatic building of a conference homepage and easily operation of the conference. And, the building tool provides the paper submission function, the pre-registration function and the email sending function using the conference homepage on Internet.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2017.11a
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• pp.118-119
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• 2017

스마트폰 기반의 모바일 플랫폼이 발달하면서 관련 서비스에 대한 수요가 급증하고 시공간의 제한 없이 누구든지 방송 콘텐츠를 제작 및 송수신 가능하게 되었다. 이에 본 논문에서는 학회 또는 세미나와 같은 컨퍼런스에서도 모바일 기반의 스트리밍 플랫폼 서비스를 제공하고자 웹캠을 통해 영상을 획득하고, 획득한 영상을 사용자 개인의 모바일 어플리케이션을 통해 실시간 스트리밍 시청 및 VOD 서비스를 제공하는 시스템을 개발하였다. 실시간 스트리밍 시청, VOD 서비스 등 다양한 기능을 탑재함으로써 기존의 컨퍼런스 관련 모바일 어플리케이션보다 더 많은 정보 제공 및 사용자 편의성 향상이 가능하다. 이 시스템을 제공함으로써 사용자는 컨퍼런스 발표 현장에 있지 않더라도 개인 모바일 어플리케이션을 통해 정보를 보다 쉽게 제공받을 수 있을 것으로 기대된다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.8 no.2
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• pp.331-337
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• 2004

Multiparty conference service based on SIP supported by VoIP network is gradually increased in use and the continuous development and standardization works on SIP are in the process of advancing. But SIP used in currently does not support identity discovery and distribution of each participant for multipath conference. In this paper, a SIP extension method for guaranteeing security from the multiparty conference based on SIP is proposed. We design a new SIP header and method for discovering and distributing a participant's identity in closed multiparty conference when the call initiation is established. And it can ensure that each participant is notified before a new participant joins.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.10a
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• pp.576-579
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• 2003

Mutimedia conference technology provides reference service as well as data service via Internet. Many standards and related applications were developed based on H.323 protocol. but H.323 protocol more complex than SIP. so IETF have developed standard that related conference control based on SIP. In this paper, we discuss REFER method that used for conference invtitation and ejection esign conference event package for conference system based on SIP protocol.

• Journal of Broadcast Engineering
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• v.23 no.2
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• pp.253-260
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• 2018

Personalized media broadcasting services can produce their own broadcasting contents with a variety of creative themes if they have just a transmission platform and devices that can obtain videos and voices of producers without the existing expensive equipment. In this paper, we develop and implement a new broadcasting system by applying this service framework to events such as seminars or academic conferences. The devices can be installed at each conference rooms and the integrated system transmitted to users. They can watch via their multi-resolution screen, such as smart-phones, laptops, and tablet PCs. It has the advantage of being able to receive real-time streaming and VOD services as well as additional information related to the conference. It is expected to provide convenience by allowing attendees to access the information via their devices, thereby creating an impact on participation and the underlying technology for the future research.