• 한국데이타베이스학회:학술대회논문집
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• 한국데이타베이스학회 1994년도 DB산업기술 활성화를 위한 학술대회 및 기술 심포지움
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• pp.105-129
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• 1994

The information system of corporations are facing a new environment expressed by miniaturization, decentralization and Open System. It is therefore of utmost importance for corporations to adapt flexibly th such new environment by providing for corresponding changes to their existing information systems. The objectives of this study are to identify this new environment faced by today′s information system and develop effective methods for data resource management under this new environment. In this study, it is assumed that the new environment faced by information systems can be specified as Distributed Computing Environment, and in order to achieve such system, presents Client/server architecture as its representative computing structure, This study defines Client/server architecture as a computing architecture which specialize the fuctionality of the client system and the server system in order to have an application distribute and perform cooperative processing at the best platform. Furthermore, from among the five structures utilized in Client/server architecture for distribution and cooperative processing of application between server and client this study presents two different data management methods under the Client/server environment; one is "Remote Data Management Method" which uses file server or database server and. the other is "Distributed Data Management Method" using distributed database management system. The result of this study leads to the conclusion that in the client/server environment although distributed application is assumed, the data could become centralized (in the case of file server or database server) or decentralized (in the case of distributed database system) and the data management method through a distributed database system where complete responsibility and powers with respect to control of data used by the user are given not only is it more adaptable to modern flexible corporate environment, but in terms of system operation, it presents a more efficient data management alternative compared to existing data management methods in terms of cutting costs.

• International Journal of Internet, Broadcasting and Communication
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• 제14권2호
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• pp.225-230
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• 2022

The intelligent home network system integrates various devices in the home into one communication network to provide information sharing, control, and operation environment between devices. This intelligent home network system operates around a home server. Home appliances in the era of the 4th industrial revolution will have numerous home servers in logical areas as the intelligent home network in the home accelerates. Therefore, the need for systematic management of home servers is emerging. We propose an agent system for efficient intelligent smart home server management. The agent system monitors the home server and operating environment for home server management of the intelligent smart home network. By referring to this monitored information, the service module of the home server is managed, and the home server is dealt with whether it is normal or not. In addition, by referring to the information collected by the service agent created in the group management server while migrating the home server, it is possible to deal with integrated meter reading, crime prevention, and topics. And when a new service is applied to the home server, it is registered in the management server and distributed to the home server through the agent, so that the intelligent smart home network can be efficiently managed.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2007년도 춘계종합학술대회
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• pp.645-648
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• 2007

본 논문은 모바일 장치에 의한 데이터베이스 관리 시스템에 관해 기술한다. 본 시스템은 모바일 장치를 사용해서 언제 어디서든지 즉시 원격으로 데이터베이스를 관리 가능하다. 이를 위해 모바일 디바이스와 인터페이스 가능한 dataset server CE와 모바일 장치에서 운용 가능한 데이터베이스 관리 시스템 및 모바일 장치를 데스크톱 컴퓨터와 연결 시켜주는 웹 서비스 프로그램을 개발했다. 외부의 모바일 장치는 웹 서비스 기능과 무선으로 연결한다. 개발한 시스템은 dataset server CE 클라이언트 엔진, 웹 서비스 서버 에이전트 및 모바일 관리 시스템을 포함한다. 애플리케이션 프로그램을 이용해서 시스템의 기능을 테스트 했고, 테스트 결과 개발한 시스템이 원래의 목적대로 잘 운용됨을 확인했다.

• 한국경영과학회지
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• 제30권2호
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• pp.131-142
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• 2005

This paper proposes queueing models for a Web server system which is composed of an infinite-buffer main server and finite-buffer auxiliary server(s). The system is modeled by the level-dependent quasi-birth- death (QBD) process. Utilizing the special structure of the QBD, we convert the infinite level-dependent QBD into a finite level-independent QBD and compute the state probabilities. We then explore the operational characteristics of the proposed web-server models and draw some useful conclusions.

• 경영과학
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• 제17권2호
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• pp.97-113
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• 2000

The introduction of client server systems raises some serious IS control concerns. Although client server systems increase system flexibility and compatibility, and facilitates system downsizing and process restructuring, multiple operating systems, database management systems, and platforms of client-server system increase th potential exposures and risks of the system. It is needed to recommend the effective control framework to mitigate risks. This paper suggests risks and control framework for client server system. The results of two case studies indicate that program and database management are important as program and data should be located and maintained in client and servers. It becomes difficult to manage divided programs and data logic that are distributed across clients and servers that have different platforms. The case studies of two banks show that the extent of distribution of program and data logic affects the importance of program and database management controls.

• 한국항행학회논문지
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• 제19권2호
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• pp.161-167
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• 2015

본 연구는 수시로 변경 및 갱신되는 국가 직무능력 표준 (NCS; national competency standards) 학습모듈을 제공하는 시스템을 제안하였다. 제안 시스템의 프로비저닝(provisioning)서버는 학습모듈을 제공하며, 관리서버는 장애관리, 빌링, 요청관리, 통계 및 집계등을 수행하며, 타겟서버는 도메인을 통하여 프로비저닝서버에 학습모듈을 요청한다. 제안 시스템은 프로비저닝서버와 타겟 서버의 도메인 일치 여부를 판단하는 CORS (cross-origin resource sharing) 기반 필터를 이용하여, 학습모듈의 제공을 결정하였다. 제안 시스템은 신규 갱신 또는 삭제되는 NCS기반 학습모듈에 대해 원격으로 패치 및 유지 보수할 수 있다. 또한, 기존 교육 관련 시스템과 연계하여 콘텐츠를 제공할 수 있으며, 타겟서버 도메인에 대한 관리가 가능하여 향후 확장기능을 도입하여 활용할 수 있다.

• 천문학논총
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• 제21권1호
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• pp.1-9
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• 2006

An archiving system designed to enable documenting database of astronomical images, with functions of search and download, is being developed by Korean Astronomical Data Center(KADC) of Korea Astronomy and Space Science Institute(KASI). The system consists of three PCs for web server, database server, and system management server. The search program for the web environment is operated in the web server. In the management server, several utility program we developed are installed: input program for the database, program for transfer from fits to jpg files, program for data recovery and management, and programs for statistics and connect management. The collected data would be sorted out by the system manager to input into the database. The online input is possible in an observatory where the data is produced. We applied the content management system(CMS) module for the database management. On the basic of CMS module, we set up a management system for the whole life cycle of metadata from creation and collection to storage and deletion of the data. For the search function, we employed a technique to extract indices from the metadata. In addition, MySQL is adopted for DBMS. We currently display about 2,700 and 25,000 photographs for astronomical phenomena and astronomical objects on the data, respectively.

• Journal of Information Technology Applications and Management
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• 제26권4호
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• pp.19-30
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• 2019

Many organizations need to comply with ISMS-P for information systems and personal information management for ISMS-P certification. Organizations should safeguard vulnerablities to information systems. However, as the kinds of information systems are diversified and the number of information systems increases, management of such vulnerabilities manually accompanies with many difficulties. SCAP is a protocol to manage the vulnerabilities of information system automatically with security standards. In this paper, for the introduction of SCAP in domestic domains we verify the applicability of server-oriented system which is one of ISMS-P certification targets. For SCAP applicability, For obtaining this goal, we analyze the structures and functions of SCAP. Then we propose schemes to check vulnerabilities of the server-oriented system. Finally, we implement the proposed schemes with SCAP to show the applicability of SCAP for verifying vulnerabilities of the server-oriented system.

• 대한원격탐사학회지
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• 제17권4호
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• pp.359-368
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• 2001

The prototype of forest fire management system on Web was studied. In the architecture of this system, one of the most important concerns is to handle load upcoming to Web Server so that it provides Web service without any delay or failure. In order to solve this problem, the agent is designed on dispatcher in a Web server cluster and implemented to distribute load dynamically by considering the information related to load coming to the Web Server such as the number of connection to the Map Server. The proposed forest fire management system has user-friendly interface with the GIS mapping functionality by selecting Map Objects Internet Map Server (MO IMS) as Map Server and is implemented using Java as programming language.

• 한국경영과학회지
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• 제18권3호
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• pp.51-63
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• 1993

We consider a cyclid server system under N-policy. This system consists of multiple queues served in a cyclic order by a single server. In this paper, we consider the following control policy. Every time server polls one queue, the server inspects the state of the queue. If the total number of units is found to have reached or exceeded a pre-specified value, the server begins to serve the queue until it is empty. As soon as the queue becomes empty, the server polls next queue. An approximate analysis of this system is presented. Sever vacation model is used as an analytical tool. However, server vacation periods are considered to be dependent on the service times of respective queues. The results obtained from the approximate analysis are ompared with simulation results.