• Journal of information and communication convergence engineering
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• v.20 no.3
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• pp.189-194
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• 2022

As non-face-to-face activities have become commonplace, online video conferencing platforms have become popular collaboration tools. However, existing video conferencing platforms have a structure in which one side unilaterally exchanges information, potentially increase the fatigue of meeting participants. In this study, we designed a video conferencing platform utilizing virtual reality (VR), a metaverse technology, to enable various interactions. A virtual conferencing space and realistic VR video conferencing content authoring tool support system were designed using Meta's Oculus Quest 2 hardware, the Unity engine, and 3D Max software. With the Photon software development kit, voice recognition was designed to perform automatic text translation with the Watson application programming interface, allowing the online video conferencing participants to communicate smoothly even if using different languages. It is expected that the proposed video conferencing platform will enable conference participants to interact and improve their work efficiency.

• Journal of the Korea Society of Computer and Information
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• v.15 no.12
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• pp.85-92
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• 2010

There is an authentication method for participants with an encrypted ID and password as a symmetric-key in multilateral video conferencing. It is hard to manage when the security-keys makes many while the transportation processing for the encryption and decryption get complicated when the video conferencing involves a number of participants and the third party as an attackers to gain unauthorized symmetric-key to access video conference which makes a problem less secrecy. This study suggests three ways to enhance security in video conference: first, we present PKI-based X.509 certificate for authenticating the participants of multilateral conferencing and we suggest to encode and decode the video conference media data using a secrecy key created by each of the conference participants; second, a more secured multilateral video conferencing can be expected in a group communication by using the participants secrecy key in creating and distributing group keys, where the group key will be renewed whenever there is change in the group member; and finally, we suggest to encode the RTP payload of the media data before transmission.

• International Journal of Computer Science & Network Security
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• v.21 no.11
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• pp.287-293
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• 2021

The purpose of this article is to consider the distance education system, its principles, features and means. One of its existing and promising tools is video conferencing. The article discusses the types of video conferencing, hardware and software, features and requirements for communication channels, types of information transmitted through these channels.

• Journal of the Korean Institute of Telematics and Electronics T
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• v.36T no.4
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• pp.123-132
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• 1999

A video conferencing system provides sharing the conference environment for geographically dispersed computer users who use the audio and video information. But the conventional video conferencing systems have some problems which are dependent on specific software and/or hardware and bound the certain platform and network environment. Furthermore the participants must know the information about other participants before joining the conference session and they have to use the same video conferencing system. This paper describes design and implementation of the video conferencing system on the WWW to solve the mentioned problems. The conference applications are transmitted from a WWW server and executed in the participants Web browsers. The participant can carry out conference services by using only the web browser. The WWW server takes charge of conferencing management including the information related to the participants and provides supported conference tools such as whiteboard, chatting and multimedia controls. Therefore the participants can easily join the conference sessions and perform conference working regardless of network connection situations. We used the Java to implement the seamless session connections and interaction between the conference participants which are the most important when implementing the video conferencing system on the WWW and used the ActiveX technology about the audio and video controls to make it easy the hardware control.

• KIPS Transactions on Computer and Communication Systems
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• v.6 no.6
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• pp.255-260
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• 2017

The limitation of real-time video conferencing system is that the delay of network and buffering and the transmission of user information are not efficiently performed between systems, so real - time performance is not guaranteed completely. In order to overcome this problem, the study on the extension of the network infrastructure and the jitter delay is actively carried out, but the study on the buffering delay is insufficient. In this paper, we propose a frame-rate control buffer management (FRCB) scheme to solve the problem caused by buffering delay. The FRCB is used to prevent overflow and underflow of the buffer by adopting the two-stage buffer threshold of Fast-play THreshold (FTH) and Slow-play THreshold (STH). Therefore, it showed better performance than jitter buffer even under high CPU load, and showed that it is suitable for high quality real time video conferencing.

• Proceedings of the Korean Information Science Society Conference
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• 1999.10b
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• pp.298-300
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• 1999

컴퓨터 지원 협동작업(Computer Supported Cooperative Work, CSCW)을 실혐시키는 그룹웨어에 대한 연구는 여러 분야에서 활발히 이루어지고 있으나, 공동 프로젝트 수행시 참여자간 의사 소통에 필요한 정보 공유를 위해 효율적인 자료 기록 및 검색에 대한 연구는 미비한 실정이다. 따라서 본 논문에서는 공동 작업시 필요한 자료 공유와 효과적인 검색을 위하여 DBMS 질의를 이용한 자료 기록과 검색 뿐 아니라 규칙 기반의 검색 엔진 설계를 포함하는 지능적인 검색기능을 제공하는 그룹웨어 회의 시스템인 IReRCoS(Record and Retrieval based Conferencing System)를 설계한다. JAVA Applet 인터페이스를 통해 공유 자료 기록 조건과 검색 조건을 입력하고 데이터베이스에 저장된 자료를 MSSQL 질의어 및 JESS의 검색 엔진을 통해 해당 파일을 추출한다. IReRCoS는 지능적인 공유자료 기록 및 검색 기능을 지원함으로써 컴퓨터 기반의 다수가 참여한 공동 작업을 원활히 수행할 수 있는 통합된 그룹웨어 환경을 제공하는 것을 목표로 한다.

• The Transactions of the Korea Information Processing Society
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• v.3 no.7
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• pp.1858-1867
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• 1996

This paper describes a platform for video conferencing on Information Super Highway. In this paper we de-sign a Multi-Multicast Server(MCS) and the platform. The platform uses Multi-MultiCast Server for multitasking IP Multicast data on IP over ATM. Based on Multicast Address Resolution Server (AMRS) which was proposed in this paper the platform maps from D class IP addresses to ATM addresses. MARS handles a recovery in case of MCS down. This paper also presents a solving mechanism for handling botteneck by using the MCS.

• Proceedings of the Korea Database Society Conference
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• 1995.12a
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• pp.132-142
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• 1995

Development in multimedia technology enhances Computer Supported Cooperative Work(CSCW) such as tole-conferencing and tole-education. These applications are also called groupware applications and usually composed of AM conferencing module and shared working space such as group editors. Through this shared working space users can present, manipulate and save common artifacts interactively. Since users are allowed to operate on common artifacts simultaneously, conflicts between user transactions are bound to happen and can cause unnatural effects on user interfaces. In this paper we reviewed these problems and presented common solutions to concurrency control problems. We also presented Coshed/SAS, a group editor, as an example of groupware applications and related concurrency control problems.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.15 no.1
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• pp.209-219
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• 2011

Most of the computer-based distance learning systems are asynchronous ones that allow students to download from the server the lecture previously given by a lecturer. While these asynchronous systems has the advantage that enable students to view the lecture with no time restriction, the study may not be effective due to the lack of support for real-time interaction between students and lecturers. Based on the student-lecturer-collaboration session model, this paper presents a collaboration session-centric synchronous distance learning system that supports real-time interaction between students and teachers, awareness information during lecture, and feedback from students. Basic feature of the proposed system include audio and video conferencing, text-based chat, and shared slide with annotation support.

• Proceedings of the Korea Information Processing Society Conference
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• 2019.10a
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• pp.11-12
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• 2019

대규모 트래픽을 처리할 수 있는 원격 화상회의 시스템 아키텍처 설계로서 다량의 메시지 송수신을 감당 할 수 있으며 사용자에게는 원활한 응답성을 보장 할 수 있는 시스템을 설계한다.