• 한국데이타베이스학회:학술대회논문집
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• 한국데이타베이스학회 1994년도 DB산업기술 활성화를 위한 학술대회 및 기술 심포지움
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• pp.49-69
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• 1994

A client/server system has become the computing architecture for the business organization which seeks competitive edges. Technically, a client/server system places application processing close to the user and thus increases performance. This paper's two primary goals are (i) to present a performance model for client/server database systems and (ii) to demonstrate analytically the effectiveness of client/server computing in comparison with other computing architectures via an illustrative example. The model is most likely to be used as a practical performance guide for client/server computing.

• 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.

• Journal of Biosystems Engineering
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• 제28권1호
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• pp.59-64
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• 2003

This study was carried out to develop database system using internet fur greenhouse. The database system consisted of group monitor, client monitor. server monitor and DBMS. The results of the study are summarized as follows. 1. The monitoring module, as data collection system for database. could monitor the state of the control device and the greenhouse environment. 2 The group monitor was connected to the house monitors by RS-485 communication method. Data received by the group monitor were sent to the server monitor and then stored in database server by TCP/IP and MIDAS. 3. The data of database consisted of on growing environment. control devices, operation and cultivation data in greenhouse. It was developed using MS-SQL server. 4. Remote monitoring of greenhouse was realized in a client/server environment. The client module. which was named as the client monitor. made requests to access the measurement data of greenhouse through the remote data module of the server monitor in internet environment.

• 반도체디스플레이기술학회지
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• 제3권4호
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• pp.13-17
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• 2004

As the usage of wireless LAN becomes common in working environment, the number of database systems that support both wired and wireless users increases rapidly. The characteristics of wireless LAN that its speed is slow relatively comparing to wired network and the users in its environment connects to different communication points as they moves creates another challenge to be resolved in database systems. In the environment of hybrid communication systems, wired and wireless for voluminous data amount and a number of users, the two layer architecture of the conventional client-server database systems has limitation in the system performance. This is due to that server is the only point of data service in client-server database systems. In this paper, we discuss a new extended database system architecture that data services are distributed among servers and clients based on user database access patterns in order to improve system performance. We analyze the expected system performance by using simulation technique and prove the practical utilization of the system by demonstrating experimental results.

• 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.

• 한국컴퓨터산업학회논문지
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• 제7권3호
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• pp.237-244
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• 2006

본 논문에서는 사용자 수 증가로 인한 확장 가능한 온라인 게임 서버 구조를 제시하고 있다. 현재 상용 서비스 중인 대부분의 온라인 게임 서버에서는 로긴서버, 캐시서버, 데이터베이스서버, 게임서버, NPC서버 등으로 구성된 하나의 서버 그룹을 운영하다가 사용자 수 증가에 따라 같은 구조의 또 다른 서버 그룹을 추가 설치하고 있다. 그러나 본 논문에서 제안하는 서버 구조는 서버를 추가 설치할 때 로긴서버, 캐시서버, 데이터베이스서버, 게임서버, NPC서버 등의 한 그룹을 추가시키지 않고 게임서버만을 추가한다. 이후 캐시서버나 데이터베이스서버에 부하가 걸릴 때에만 또 다른 서버 그룹을 추가시켜 서버 추가 비용을 최대한 줄일 수 있게 하였다.

• 한국정보시스템학회지:정보시스템연구
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• 제4권
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• pp.85-104
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• 1995

In a loosely-coupled distributed database server system, a server failure and/or a communication failure can be masked by a resiliency mechanism. Recognizing that a distributed transaction executes at several servers during its lifetime, we propose a resiliency mechanism which allows continuous transaction processing in distributed database server systems in the presence of a server failure. The resiliency mechanism for transaction processing is achieved by keeping redundant information using a primary/backup approach. The purpose of this paper is to analyze the performance improvement opportunities with the resiliency mechanism and to present the design of the proposed system.

• 정보보호학회논문지
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• 제28권4호
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• pp.859-868
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• 2018

데이터베이스의 삭제된 데이터 복구와 관련된 그간의 연구는 삭제된 레코드가 트랜잭션 로그에 존재하는 경우이거나 데이터베이스 원본을 물리적 방식으로 수집하여 삭제 데이터의 탐지와 복구를 진행하는 방식이 주를 이루었다. 그러나 트랜잭션 로그가 존재하지 않거나 증거수집 현장에서 물리적 방식의 원본수집이 불가능한 경우 즉, 데이터베이스 서버 정지로 인해 피압수인이 업무상 손실 또는 권리침해를 이유로 거부하는 경우에는 적용하기 곤란한 한계가 있었다. 그러므로 증거수집 현장의 제약을 대비하기 위해 다양한 수집 방식을 살펴보고 이에 따른 삭제된 레코드의 복구 가능성에 대해서 확인해볼 필요가 있다. 이 논문에서는 Microsoft SQL Server 데이터베이스를 대상으로 하는 디지털포렌식 조사 시 원본 수집의 논리적 물리적 방식별로 수집된 원본 파일 내 삭제된 데이터의 잔존 여부를 실험하여 각 수집 방식에 따른 데이터 복구 가능성을 확인하였다.

• 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.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2008년도 정기 학술대회
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• pp.458-463
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• 2008

An IFC Server is a database management system that stores data complying with a standard data format, called IFC, and keeps track of data transactions, modifications, and deletions. It plays a role as an information hub for storing and sharing information between various parties involved in construction projects. There have been several efforts to develop an IFC Server, however, they suffered from slow performance and long transaction time due to a complex mapping process between IFC files and relational database structures. In this study, we aim to develop an IFC Server using an object-relational database system. Since IFC has an object-flavored data structure, we expect to have a simpler and faster mapping process from IFC to the IFC Server. This paper reviews existing studies and describes the overall framework of the OR-IFC Server.