• Proceedings of the IEEK Conference
• /
• 1998.06a
• /
• pp.729-732
• /
• 1998

ITU-T recommends T.120 for multimedia conferencing data protocols. In this paper, generic model of application protocols is shown for guaranteeting internetworking between application protocols in application users. And using generic conference control and multipoint communication service, multipoint binary file transfer application protocol is shown throughout application protocol generic model on public session environment.

• Journal of Korea Multimedia Society
• /
• v.10 no.3
• /
• pp.335-347
• /
• 2007

VoIP (Voice over IP) is a technology to transport video and voice traffic over IP networks such as Internet. Today, the VoIP technology is viewed as the right choice for providing voice, video, and data communication among various terminals over the next generation network. This paper discusses a multipoint VoIP implementation with end-point mixing model which can support multipoint conference without a conference bridge. The multipoint VoIP is implemented with SIP (Session Initiation Protocol), and supports STUN (Simple Traversal of UDP Through NATs) since it works in an asymmetric NAT (Network Address Translator) environment. The characteristics of this paper are as follows. It is possible that all terminals in the hierarchical conference don't receive the duplicated media information because we use the end-point mixing model with the new media processing module. And, the paper solves the problem that the hierarchical conference session should be separated into several sessions when a mixing terminal terminates the hierarchical conference session.

• Proceedings of the IEEK Conference
• /
• 2008.06a
• /
• pp.695-696
• /
• 2008

UFC(Ubiquitous Fashionable Computer) is a human oriented fashionable computer with which we exploit the ubiquitous computing environment by our intuitive interface[1]. The multipoint conference in the UFC is expected to be one of the leading applications in the ubiquitous environments. In this paper, we introduce GUI for multipoint conference system in UFC.

• Proceedings of the IEEK Conference
• /
• 2009.05a
• /
• pp.16-18
• /
• 2009

VoIP(Voice over IP) is the technology to transport voice and video over IP networks such as Internet. Today, VoIP technology is viewed as the right choice for provide voice, video, and data communication over next generation network. We are sure that the multipoint VoIP will help enhancing the various application services in ubiquitous environment. The paper shows multipoint VoIP system implemented with end-point mixing model and introduces various embedded systems such as UFC(Ubiquitous Fashionable Computer), tourist guide terminal and industrial terminal which use the multipoint VoIP.

• The Transactions of the Korea Information Processing Society
• /
• v.2 no.3
• /
• pp.277-287
• /
• 1995

For multipoint video conference of using multimedia communication terminals, terminals are logically connected each other, and there are centralized method and distributed method in connection between terminals. Multipoint control unit is needed for the centralized method, there are two methods for implementaion such as digital method and analog method. For a meaning and implementation method of multipoint control init, main funtions of multipoint control unit are summarized and the various implementation methods are proposed in this paper.

• The Transactions of the Korea Information Processing Society
• /
• v.4 no.4
• /
• pp.955-962
• /
• 1997

For the implementation of a multimdia cinference applications in a various communication network,the fun-damental conference services are needed.MCS(Multipoint Sdrvices)is remommended for this purpose.In this paper,the related papers are analyzed for the implementation of MCS that is recommended in inter-national standard for a multimedia confernece.Based on this,the algorithm is proposed and implemented in unix machine and Windows/NT machine.

• The KIPS Transactions:PartC
• /
• v.14C no.6
• /
• pp.481-492
• /
• 2007

The ubiquitous environment allows users to communicate with others and to have access to computing service any time, any place. Multipoint VoIP is expected to be one of the loading applications in this environment. The paper compares various conference models for efficient VoIP service in ubiquitous environment and shows why the endpoint mixing model performs effectively in this environment. However, the endpoint mixing model has its own drawbacks as well and we propose solutions to solve the problems.

• Proceedings of the IEEK Conference
• /
• 1998.10a
• /
• pp.59-62
• /
• 1998

Satellite communication systems will play an important role in establishing high-speed information communication network ddue to the characteristics of flexibility of bandwidth, mobile communication, wide coverage, multipoint and broadcasting. Also satellite systems have the capability to supply terrestrial B-ISDN with flexible links for accessing networks as well as trunking networks. Therefore, satellites must provide compatibility to earth-based B-ISDN signalling interface, services and network capability. This paper proposed interworking model between terrestrial B-ISDN and satellite B-ISDN signalling protocol and illustrated basic call-process procedure of satellite B-ISDN signalling protocol supporting point-to-point and point-to-multipoint connection.

• Proceedings of the IEEK Conference
• /
• 1998.10a
• /
• pp.281-284
• /
• 1998

The multimedia services like video-conferencing and interactive multimedia services require the support for the multipoint-to multipoint connections from the networks. The routing and signaling protocols for supporting these connections in ATM networks have been a interesting topics in the Telecommunication standardization sector such as ATM-Forum. In this paper, we survey and discuss the various well-known switching algorithms for multi-way communication.

• Proceedings of the IEEK Conference
• /
• 1998.06a
• /
• pp.134-137
• /
• 1998

In this paper, we propose a new consolidation algorithm for point-to-multipoint ABR flow control and compare the performance of the proposed algorithms with that of an existing consolidation algorithm. We first investigate problems of the existing algorithm in consolidating backward RM cells and propose two new consolidation algorithms to resolve these problems. Also, we investigate the performance of the proposed algorithms by simulation. As results, we show that the proposed algorithms exhibit a better performance than the existing algorithm in terms of ACR, queue length, utilization, and fairness.