• Journal of KIISE:Databases
• /
• v.27 no.2
• /
• pp.227-237
• /
• 2000

A Web database System is a large-scaled multimedia application system that has multimedia processing facilities and cooperates with relational/Object-Oriented DBMS. Conventional hypertext modeling methods and DB gateway have limitations for Web database because of their restricted versatile presentation abilities and inefficient concurrency control caused by bottleneck in cooperation processing. Thus, we suggest a Dynamic Navigation Model & Virtual Graph Structure. The Dynamic Navigation Model supports implicit query processing and dynamic creation of navigation spaces, and introduce node-link creation rule considering navigation styles. We propose a mapping methodology between the suggested hypertext model and the relational data model, and suggest a dynamic allocation scheduling technique for query processing server based on weighted value. We show that the proposed technique enhances the retrieval performance of Web database systems in processing complex queries concurrently.

• 한국공간정보시스템학회:학술대회논문집
• /
• 2003.11a
• /
• pp.84-90
• /
• 2003

최근 이동 컴퓨팅 기술이 급속도로 발전하면서 이동 객체의 위치정보를 활용한 위치 찾기 서비스, 교통 정보 서비스, 긴급 구조 서비스, 모바일 광고 서비스와 같은 위치 기반 서비스가 부각되고 있다. 이와 같은 다양한 서비스를 제공하기 위해서는 이동 객체의 위치정보를 신속하게 저장, 검색, 갱신할 수 있는 이동 객체 데이타베이스 시스템이 필수적으로 요구된다. 그러나, 기존의 데이타베이스 시스템을 사용할 경우에는 저장 공간을 많이 차지게 되고, 불필요한 트랜잭션 연산으로 인하여 대용량의 위치 데이타 관리에 큰 오버헤드가 발생한다는 문제가 있다. 그러므로, 이동 객체의 위치 데이타를 저장하고 관리하기 위하여 화일 기반의 저장 시스템을 사용하는 것이 보다 더 효율적이다. 이에 본 논문에서는 대용량의 위치 데이타를 효과적으로 저장 및 검색할 수 있는 화일 기반 이동 객체 저장 컴포넌트를 설계하고 구현하였다. 화일 기반 이동 객체 저장 컴포넌트는 다중 연결 관리자, 단순 질의 처리기, 메타데이타 관리자, 데이타 화일 관리자, 인덱스 화일 관리자, 로그 관리자, 관리툴로 구성된다.

• The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
• /
• v.4 no.1
• /
• pp.28-37
• /
• 1993

The future Personal Communication Service(PCS) is the total personal information communication service to satisfy the importance of information in a highly information - oriented society. Compared with the conventional communication method, it is necessary to provide considerable intelligence to the commu- nication network in order to implement the PCS which guarantees the mobility of each individual. Consequen- tly, the PCS needs a fast large database system which stores the information of each individual. To achieve this goal, this paper presents the parallel implementation of deductive database systems as a main - memory database system.

• Journal of the Korean Society for information Management
• /
• v.12 no.2
• /
• pp.151-169
• /
• 1995

The purpose of this research is to investigate the of multimedia university library system theoretical models and to design partial functions of this model using multimedia toolbook 3.0. The theoretical model is constructed based on several operating systems such as JANUS Virtual Library and The Book House. Knowledge base of the designed system is constructed by interviewing reference librarians. The designed system consists of six modules : Reference Expert system. Journal Browsing, Multimedia Database, OPAC, External Database and User' s Guide. Finally, four problems are discussed as several major problems in building up multimedia university library network

• Journal of KIISE:Databases
• /
• v.31 no.2
• /
• pp.195-204
• /
• 2004

The Semantic Web is proposed as the next generation Web technology. In the environment of the Semantic Web, resources are related with each other semantically and computers can process this information easily. The Resource Description Framework (RDF) supports this semantic relationship. RDF is the data model for describing metadata of the Web resources. To establish and develop the Semantic Web, methods for managing RDF data efficiently are the most important. So, in this research, we propose methods for storing and querying RDF data using an XML database system. Using an XML database system, XML data, main data of the Semantic Web, and RDF data, the metadata of XML data, can be managed in the same storage and by the same mechanism efficiently. In addition, we propose an efficient data retrieval method and several techniques to improve the system performance. Our query processing technique performs better than an existing system.

• Journal of KIISE:Databases
• /
• v.32 no.1
• /
• pp.24-42
• /
• 2005

Characteristics of biological data including genome sequences are heterogeneous and various. Although the need of management systems for genome sequencing which should reflect biological characteristics has been raised, most current biological databases provide restricted function as repositories for biological data. Therefore, this paper describes a management system of nucleotide sequences at the level of biological laboratories. It includes format transformation, editing, storing and retrieval for collected nucleotide sequences from public databases, and handles sequence produced by experiments. It uses BSML based on XML as a common format in order to extract data fields and transfer heterogeneous sequence formats. To manage sequences and their changes, version management system for originated DNA is required so as to detect transformed new sequencing appearance and trigger database update. Our experimental results show that applying active trigger rules to manage changes of sequences can automatically store changes of sequences into databases.

• Proceedings of the Korean Operations and Management Science Society Conference
• /
• 1995.04a
• /
• pp.337-348
• /
• 1995

제품의 생산 및 제조원가는 크게 직접재료비, 직접노무비, 제조간접비로 나눌 수가 있다. 본 연구는 제조업의 제품별 제조원가분석을 위하여 실제 중소기업을 대상으로 관계형 데이타베이스(Relational Database)를 구축해 보았으며, 작업자의 작업시간을 시급으로 관리하여 줌으로써 제품별 원가요소 중 직접노무비(인건비)를 여러가지 요목별로 산출해 낼수 있는 활동중심 경영관리(ABM: Activity-Based Management)를 위한 원가관리 시스템의 프로토타입(prototype)을 설계하였다. 본 시스템에서는 각 작업자별 실작업시간에 따라 발생하는 시급을 작업자의 급여테이블과 연계하여 구함으로써 작업자별 작업시간관리가 가능할 뿐만 아니라, 제품별 제조시간 조회를 통해 표준시간과 비교하는 자료로 제공될 수가 있다. 또한, 제조간접비(제조경비)는 월말 제조원가 산정시 사용자로부터 입력받아 그 달에 생산한 모든 제품에 가중치(weight)에 의해 배분해 주는 방식을 이용하였으며, 직접재료 원가(자재비)는 제품별로 데이타베이스를 구추갛여 제조원가에 반영시켰다. 그리고, 시스템에 유연성을 주기 위해 A/S 제품인 경우는 추가 자재비를 입력시킬수 있도록 고려하였으며, 재공품재고(WIP: Work-In-Progress)등의 정보를 제공함으로써 효과적인 시스템 운영이 되도록 설계하였다.

• The Transactions of the Korea Information Processing Society
• /
• v.4 no.1
• /
• pp.29-53
• /
• 1997

Conventional switching systems have been using flat file systems or relational database systems to deal with their operational data. However, newly emerged requirements for advanced switching systems make relational database systems no longer proper solutions. This paper defines object-oriented interfaces that effectively incorporate data characteristics of switching systems. In addition, it exemplifies how the method works on an actual database systems for the TDX-10 switching system.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.19 no.10
• /
• pp.1935-1944
• /
• 1994

FMS is a distributed system composed of various programmable manufacturing hardware such as robots and NC machines. For the autonomous operation of such a system, an integrated software layer for the control and monitoring in needed on top of the manufacturing hardware. However, constructing and maintaining such a software layer is difficult due to the complexity of a underlying FMS and its frequently changing nature. To cope with this problem, this paper proposes an object-oriented FMS integration model, in which objects acting as virtual manufacturing cells are instantiated for each physical cell in the underlying object-oriented database. Various other entities involved in manufacturing processes and their relationship to the cell objects are also captured in the database. This paper describes the structure of this object-oriented FMS database on our prototype implementation called FREE.

• Journal of KIISE:Software and Applications
• /
• v.29 no.7
• /
• pp.436-449
• /
• 2002

This paper describes on our experience of developing the Database Connector as an interconnection method between multimedia database, and the streaming framework. It is possible to support diverse and mature multimedia database services such as retrieval and join operation during the streaming if an interconnection method is provided in between streaming system and multimedia databases. The currently available interconnection schemes, however have mainly used the file systems or the relational databases that are Implemented with separated form of meta data, which deafs with information of multimedia contents, and streaming data which deals with multimedia data itself. Consequently, existing interconnection mechanisms could not come up with many virtues of multimedia database services during the streaming operation. In order to resolve these drawbacks, we propose a novel scheme for an interconnection between streaming framework and multimedia database, called the Inter-Process Communication (IPC) based Database connector, under the assumption that two systems are located in a same host. We define four transaction primitives; Read, Write, Find, Play, as well as define the interface for transactions that are implemented based on the plug-in, which in consequence can extend to other multimedia databases that will come for some later years. Our simulation study show that performance of the proposed IPC based interconnection scheme is not much far behind compared with that of file systems.