• The Journal of the Korea institute of electronic communication sciences
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• v.8 no.1
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• pp.121-126
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• 2013

In the past several years there has been increasing the studies using P2P technology in the distributed system areas. In these P2P systems, the server to support the contents-information have less overloads than the composed system as the server to have resources generally. In this paper, we propose the system to support a social network P2P service based on the social network P2P system. The object of this study was to widen the use of this menu system to determine the price based on visual information by a software agent. Therefore, this system is suitable for micro, small and medium industries in the use of P2P servers and is more usable system interface for owners than previous study.

• Journal of KIISE:Computer Systems and Theory
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• v.33 no.8
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• pp.505-513
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• 2006

To satisfy SLA(Service Level Agreement) contract between a client and a service provider, the client requests are classified and processed by priorities. In providing differentiated service, a request from a client who has low priority can be dealt with less important. In this paper, we study static and dynamic partitioning mechanism of web servers and also admission control policy for multiclass request distribution. Through simulation experiments, we analyze web server throughput and response time considering SLA.

• The Journal of the Korea institute of electronic communication sciences
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• v.6 no.3
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• pp.445-449
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• 2011

A P2P technique is the concept to share sources efficiently in distributed environment that is studying a lot. In these P2P systems, the server to support the contents-information have less overloads than the composed system as the server to have resources generally. In this paper, we suggest a P2P system to support conveniences for users that were connected with the information of joint-buying based on social network. The joint-buying information based on social network is supported by peers using a p2p system and these information to intermediate are supported by a P2P server.

• Journal of KIISE:Computing Practices and Letters
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• v.8 no.1
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• pp.25-35
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• 2002

Many multimedia presentation applications involve retrieval of objects from more than one collaborating server. Presentations of objects from different collaborating servers might be interdependent. This implies that objects should be retrieved from remote servers and delivered continuously according to given time constraints. Such applications need an estimate of the avaliable network resources to each of the collaborating servers and local system resources in order to identify a schedule for retrieving the objects composing the presentation. A collaborating server can suggest modifications of the retrieval schedule depending on its load. these modifications can potentially affect the retrieval schedule for other collaborating applications. Hence, a sequence of negotiations has to be carried out with the collaborating servers in order to commit for a retrieval schedule of the objects composing the presentation. In this paper, we propose an application sub-layer protocol, RLCP(Resource Lock Commit Protocol), for handling the negotiation and commitment of the resources required for a collaborative multimedia presentation and apply it to distributed video presentation application.

• Annual Conference of KIPS
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• 2002.11c
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• pp.2187-2190
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• 2002

웹 기반 응용 시스템의 효과적인 개발기법이 급속히 발전 및 도입되고 있다. 특히, 컴포넌트기반의 개발기법은 쉽고 빠른 개발기간뿐만 아니라 향후 유지보수 및 재사용성의 편리성으로 인하여 가장 효율적인 개발방법으로 전해지고 있다. 이에 따라, COM+, CORBA, EJB등의 많은 컴포넌트의 지원기술이 발표되었고 이를 실무 개발에 적용하고 있다. 웹을 기반으로 하는 전자상거래분야는 다양한 고객의 요구사항과 효율적인 서비스지원을 위하여 컴포넌트 기술을 실무에 도입하고 있으며, 효과적인 상거래 시스템 구축을 위하여 지속적인 연구가 진행되고있다. 따라서, 본 논문은 서버측 컴포넌트 모델인 EJB를 이용하여 전자상거래에 사용될 수 있는 좌석예약 및 확인 시스템을 다중서버환경에서 구현하였다. 이는, Main Server를 위해 Resin Server환경의 Server를 이용한 JSP와 Java를 통하여 구현하였다. 따라서, EJB를 통한 독립 컴포넌트를 통하여 전자상거래 시스템 로직사이의 독립성을 높였으며, 분산된 EJB 서버를 통하여 해당 메소드를 호출함으로써 서버의 부하를 줄이고, 각 로직자원들을 효율적으로 관리할 수 있도록 하였다.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.20 no.3
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• pp.281-286
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• 2007

An engineering design problem involving Multi-Disciplinary Analysis(MDA) generally requires a large amounts of computing time for the entire design process, and therefore it is essential to introduce a Multiple Processor System (MPS) for reducing the computing time. However, when applying conventional parallel processing techniques, all of the CAE S/W requited for the MDA should be installed on all the servers making up MPS because of characteristic of MDA and it would be a great expense in CAE S/W licenses. To solve this problem, we propose a Weight-based Multiqueue Load Balancing algorithm for a heterogeneous MPS where performance of servers and CAE S/W installed on each server are different of each other. To validate the performance, a Computational experiments comparing the First Come First Serve algorithm and our proposed algorithm was accomplished.

• Annual Conference of KIPS
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• 2014.04a
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• pp.83-86
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• 2014

분산 파일시스템의 클라이언트 측에 SSD 장치를 캐시장치로 사용하여 분산파일시스템에 부족한 랜덤 입출력 성능을 향상시키고, Back-end 데이터 서버의 부하를 줄일 수 있다. 본 논문은 국내에서 개발된 분산파일시스템인 MAHA-FS의 클라이언트 측에 읽기 캐시로 SSD 장치를 지원함으로써 캐시 히트시에 읽기 성능을 향상 시킬 수 있음과 더불어 읽기 캐시의 기능 추가로 인한 쓰기 성능의 저하가 없음을 보여준다. 본 논문에서 제안한 SSD 캐시를 이용하여 분산파일시스템의 활용 분야을 넓힐 수 있을 것으로 기대한다.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2004.11a
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• pp.174-174
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• 2004

• Proceedings of the Korea Multimedia Society Conference
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• 2003.05b
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• pp.455-459
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• 2003

In the great motive power which promotes the Game of future to develop. three main factors focus on 3D Graphics, Network and Virtual Reality. the Network technique as necessary elemental technique in Next-generation on-line game is being researched largely. However, from viewing the features of on-line game, if many users meet in same server, it not only causes heavy load to the server and brings inconvenience to the users, but also increases expense to the service provider and creates a problem which is to put up server or not. A proposal is going to do hybrid distributed system a client hardly depends on server for this paper, and to be able to enjoy a network game through information alternating current between clients. depended on the existing server, and the most message processing did a design in order to achieve between clients. A design way to propose is as follows. Primarily it was done in order proposed a message grade anger process way, and to be able to manage server or a client according to importance of message, and, with the second, did a Client-Server method and a Pear-to-Pear method at the same time, and a chase did efficiency. Third is going to propose other problem solving way by message grade anger in multi-anger and a security section of a message cue.

• 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.