• Journal of the Korea Society of Computer and Information
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• v.17 no.10
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• pp.71-77
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• 2012

In this paper, We have proposed an efficient SIP(Session Initiation Protocol) messages control which can be used to reduce conference servers load in distributed conference model. Each conference participant can control the amount of event notification messages from the conference server in real time according to its processing capacity and network circumstances. And the amount of SIP messages needed to maintain session with the conference servers can also be controlled actively in our system. The amount of SIP messages which should be processed by the conference servers can be reduced largely by using our suggested method. Therefore the conference system can be more easily expandable and total network traffic can be reduced largely in SIP environment. We have suggested new conference event packages and conference information data model with some added elements that are necessary for efficient SIP messages control. The performance of the proposed system has been evaluated by experiments.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.19 no.5
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• pp.45-57
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• 2009

In this paper, we implemented the conference system based on DTLS for saving securely the VoIP, which is served sprightly in the latest, securely and tested (and also analyzed) the system. As VoIP technology development, demand of conference system is increased and the related technologies are growed. But Security protocol to protect conference service is getting late than conference technology. In this paper, we studied based on DTLS protocol that can provide function of signaling, channel security, media channel security and application of group key and apply to VoIP conference system based UDP unchanged. In this paper, we searched suggested security protocols based on DTLS can apply to conference system and implement and apply the protocol to conference system. And we tested (and also alayzed) overhead of encryption and key management mechanism.

• Journal of the Korea Society of Computer and Information
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• v.13 no.7
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• pp.199-205
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• 2008

The centralized conference model has advantage of conference management and control. however it's scalability has been limited as performance degrades largely with increasing number of conference users. So new distributed conference models which improve scalability of centralized conference model have been suggested recently. In the distributed conference model. as conference users exceed a predefined maximum number, a new conference server is added to the conference dynamically. In this paper, We have proposed a new method which increases efficiency of conference event package processing that primary conference server should charge in the distributed conference environment. The primary conference server exchanges informations with each secondary conference servers and conference users by using conference event package. And from the conference information database it selects SIP(Session Initiation Protocol) UA(User Agent) which will share notification to the conference users, and transfers lists to each conference servers. The conference servers make the selected UAs share processing of conference event package, so loads of SIP signal processing decrease, and improve scalability of distributed conference model. The performance of our proposed model is evaluated by experiments.

• Pallet News
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• s.51
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• pp.3-10
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• 2008

아시아 물류선진화를 위해서는 현대물류에 있어 가장 효율적 시스템인 유닛로드 시스템(Unit Load System ULS)의 구축과 보급 확산이 시급한 과제다. ULS는 일관파렛트화와 컨테이너화가 그 핵심이며, 일관파렛트화와 컨테이너화는 파렛트와 컨테이너의 표준화로 가능하다. 본 협회는 아시아 유닛로드시스템의 중요성과 구축방안에 대한 한 중 일 아시아 유닛로드시스템 컨퍼런스를 개최하였으며 또한 제5회 한국파렛트컨테이너산업대상 시상식을 갖고 개최하여 산업물류 혁신을 위해 표준파렛트와 컨테이너 생산 및 사용에 있어 가장 모범이 되는 우수한 업체와 이러한 활동에 헌신한 개인 또는 단체를 발굴, 시상하였다.

• 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.

• Journal of the Korea Society of Computer and Information
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• v.14 no.5
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• pp.85-91
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• 2009

The centralized conference architecture has a restriction in scalability due to the performance reduction as the number of conference participants increases. To solve this problem several distributed conference architectures have been studied recently. In these architectures new conference servers are added dynamically to the conference environment. In this paper, We have proposed a new conference information data model which can be used in these distributed conference architectures. In our newly proposed conference information data model. several components has been added for exchanging conference information between primary conference server and multiple secondary conference servers. We also proposed a procedure of conference information exchange between these conference servers. And the management of conference informations and SIP(Session Initiation Protocol) notifications to the total conference participants can be processed distributedly with these conference servers, therefore the load to the primary conference server can be decreased by using this method. The performance of our proposed model has been evaluated by experiments.

• Pallet News
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• s.64
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• pp.5-14
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• 2012

올해 8회째를 맞이하는 한국파렛트컨테이너산업대상은 명실공히 대한민국 물류인들의 축제의 장으로 거듭나고 있다. 특히 이번 행사에서는 KPCA 창립 15주년 기념행사와 유닛로드시스템 컨퍼런스를 더불어 개최하여 그간 같은 자리에서 묵묵히 걸어온 KPCA 임직원들의 노고를 치하하는 한편, 유닛로드시스템 컨퍼런스를 통한 국내 우수기업의 유닛로드 시스템 개선사례 및 성공사례를 발표하는 시간을 가졌다. 한국파렛트컨테이너산업대상은 산업물류 혁신을 위해 표준파렛트와 컨테이너 생산 및 사용에 있어 가장 모범이 되는 우수한 업체와 이러한 활동에 헌신한 개인 또는 단체를 발굴, 시상함으로써 유닛로드 시스템의 보급 확산을 촉진하기 위해 제정된 상이다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2022.07a
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• pp.101-103
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• 2022

본 논문에서는 오프라인 컨퍼런스의 한계점인 접근성 문제와 온라인 컨퍼런스의 한계점인 참여자간 상호 소통과 네트워킹 문제점을 해결하기 위한 솔루션으로 WebRTC 기반 메타버스 컨퍼런스 시스템을 제안한다. 해당 솔루션은 WebRTC를 활용한 실시간 화상채팅 및 멀티접속을 구현하고 WebVR을 기반으로 하는 A-Frame 프레임워크를 활용하여 메타버스 컨퍼런스 시스템을 구현하였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.10a
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• pp.572-575
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• 2003

Mutimedia conference technology provides conference 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 design conference event package for conference system based on SIP protocol.

• Pallet News
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• s.51
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• pp.20-24
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• 2008

본 내용은 지난 10월 23일 대한상공회의소에서 있었던 한 중 일 아시아 유닛로드시스템 컨퍼런스 발표자로써 (사)일본파렛트협회 후쿠모토 히로지 전무이사가 발표한 내용입니다.