• 한국경영과학회지
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• 제16권2호
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• pp.36-48
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• 1991

In this study, an efficient algorithm is developed to compute steady state probabilities for the following M$_{x}$G/1 server vacation system under control-operating poligy: At the end of a busy period, the server takes a sequence of vacations, each for a random amount of time. At the end of each vacation, he inspects the length of the queue. If the queue length at this time is equal to or greater than a prespecified threshold value r, he begins to serve the queue until it is empty.y.

• 한국경영과학회지
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• 제4권1호
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• pp.41-51
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• 1979

The Classical multi-server heterogeneous queuing system can be more generalized by using the concept of the switching rules. The descriptions of these systems, the relations among the state probebilities at the various points of interest, and comparisons with the single-server system will be presented. Instead of using the imbedded markov chain we set up the simultaneous equations for the state probabilites by the supplementary variable method.

• 한국경영과학회지
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• 제18권2호
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• pp.83-103
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• 1993

This paper addresses an optimization problem faced by a multi-server and multi-class customer system in manufacturing facilities and service industries. This paper presents a model of an integrated problem of server allocation and customer type partitioning. We approximate the problem through two types of models to make it tractable. As soution approach, the simulated annealing heuristic is constructed based on the general simulated annealing method. Computational results are presented.

• 한국IT서비스학회지
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• 제10권4호
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• pp.281-293
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• 2011

Server consolidation and virtualization have become an integral part of IT planning to reduce TCO cost and ensure the high availability for customer, enlarge the flexibility to computing resource in today' enterprise data centers. In spite of having the variety advantages of server consolidation and virtualization, they cause many problems such as the software licensing issues, virtual server sprawl, network complexity issues, hardware start-up costs, and failover costs. In particular, software licensing problem brings about the serious results in operating of data center and also presents a significant challenge to virtualization because many vendors have realized that licensing policies applicable to physical systems are not compatible with virtual machines. So, the IT planers must be considering this problem before they conducts the server consolidation and virtualization. In this paper, we proposed the efficiency strategy of SW licensing for server consolidation and virtualization analyzing the N-Datacenter case in Korea. As a result, we suggest the two strategies as technical and management/contract aspect. First, as the technical aspect, we propose i) the adaptation of suitable licensing for virtualization, ii) differentiation of license according to the characteristics of server, iii) the core distribution of licenses to minimizing. Second, as the management/contract aspect, we suggest following three things. i) The existing license agreement is changed to the right licensing for virtualization. ii) The license agreement is contracts the active focused. iii) When a new contract should be added to virtualization provisions.

• 한국정보통신학회논문지
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• 제3권2호
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• pp.355-362
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• 1999

시스템 관리 영역의 한 부분인 트래픽 모니터링은 시스템의 상황을 파악하는데 있어서 매우 중요하다. 현재 CORBA 표준화를 담당하는 OMG에서는 CORBA 시스템 관리의 표준화를 진행 중에 있으며, 많은 회사와 연구소들은 필요에 의해 CORBA에서의 시스템 관리에 대해 개발하고 연구하고 있다. 본 논문에서는 표준화된 OSI 관리 방식을 통하여 CORBA 트래픽 모니터링을 하기 위한 프록시를 설계하였다. 이를 위해, CORBA 자원을 관리하기 위한 6개의 파리미터를 정의하고, 이들을 관리객체로 만들었다. 본 논문에서 모니터링 시스템의 구성은 CORBA 서버, 프록시 객체, 고리고 MIB로 되어 있다. CORBA 서버는 서비스 제공자, 프록시 서버, 그리고 이벤트 서버로 구성되었다. 프록시 객체는 CORBA 객체인 프로세스로 작동을 하며, 프록시 클라이언트, 이벤트 클라이언트, IPC 서버로 구성되었다.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 2000년도 춘계공동학술대회 논문집
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• pp.766-769
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• 2000

In recent years, Internet/Intranet represents the next generation of computing environment. Therefore, it is necessary to integrate WWW((World Wide Web) over internet/intranet and DBMS(Database Management System) in proportion to the increase of various users' request and an amount of data variety. Also, also full variety of service over WWW need to accomplish rapidly modification of bug and make a betterment of system according to a feature of rapid change of information and an importance of interaction with users. The typical CGI method commonly used to connect with database has a disadvantage in time and resources in system due to frequent connection with database. Therefore, this paper provides the conceptual structure and implementation of information management system over WWW with applying a recent information technology called ASP(Active Server Pages) that controls and arranges client logic dynamically in server-side and introducing a concept of working group and folder to database design.

• 디지털산업정보학회논문지
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• 제4권2호
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• pp.101-108
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• 2008

In this paper, we develop system to backup automatically personal data by real time based on ECA model. This system backups data that is changed in user PC using CDP technology based on ECA model. Proposed ECA model defines file's change such as file creation, update, remove etc. in user PC to event for synchronization between server and user PC. If event is detected about file, proposed system examines condition that is defined and backup the file to server. Backup data that is stored to server can recovery on point of time that user wants. The proposed system can be applied to data management system for business, personal data management system, high-capacity contents management system etc.

• 전자공학회논문지A
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• 제30A권12호
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• pp.125-134
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• 1993

This paper describes the design and implementation of a CAD object management system for the design library in VHDL design environment. For the efficient manipulation of design objects, the library is managed independently of the underlaid CAD system. Management and revision of design objects can be performed by a batch script of server commands or through the user interaction in the X/MOTIF graphic environment. Through the library server, design management tasks can be efficiently performed, such as configuration of design objects, version control, and management of attributes and methods for versions. Experimental results show that the proposed system is a viable tool for the management of design data in VHDL design environment.

• 한국경영과학회지
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• 제24권4호
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• pp.157-170
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• 1999

The web-based groupware systems hold many possibilities for system developers and users. Especially, web-based group collaborative systems are emerging as enterprise-wide information systems. Since data in group collaborative systems are apt to be shared among multiple concurrent users and modified simutaneously by them, the web-based group collaborative systems must support synchronous collaboration in order to provide users with synchronized and consistent views of shared data. However, current web technologies have limitations in supporting this, largely because the existing Hypertext Transfer Protocol(HTTP) is unidirectional and does not allow web servers to send messages to their web browsers without first receiving requests from them. This paper proposes an active web server that can overcome such limitations and facilitate synchronous collaboration in web-based group collaborative systems. To accomplish such goals, the active web server manages dependency relationships beween shared data and web browsers referencing them and actively propagates changing details of the shared data to all web browsers referencing them. And, this paper examines usefulness and effectiveness of the active web server to apply it to the ball-bearing design example of concurrent engineering design systems. The prototype system of the active web server is developed on a commercial Object-oriented Database Management System(0DBMS) called OBJECTSTERE using the C++ programming language.

• 한국콘텐츠학회논문지
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• 제12권2호
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• pp.60-68
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• 2012

본 논문은 클라이언트-서버 환경에서 렌더링 모듈을 이용하여 분산 렌더링 작업이 가능한 시스템의 설계 및 구현 기법에 대해 기술한다. 기존 상용 소프트웨어에서는 렌더링과 분산 환경 지원 모듈이 통합되어 동작하는 환경을 제공하고 있어 클라이언트와 서버에 각각 필요하지 않는 기능까지 설치해야 하고 특정장면에 대한 렌더링 기능이 부족하더라도 사용할 수밖에 없는 문제점을 가지고 있다. 이러한 단점을 해결하기 위해 본 논문에서는 클라이언트와 서버에서 각각 동작하는 분산 렌더링 관리 시스템을 설계하였고 독립적으로 동작이 가능한 렌더링 모듈을 클라이언트에서 관리하도록 하였다. 서버는 각 클라이언트에게 렌더링 요청 후 렌더링 결과를 취합하여 최종적으로 시스템 사용자에게 렌더링 결과를 제공한다.