• The KIPS Transactions:PartD
• /
• v.12D no.4 s.100
• /
• pp.531-542
• /
• 2005

In this paper, we propose the MDBMS(Multi-DataBase Management System) which integrates the LDBMSs(Local DataBase Systems) with heterogeneous environment into distributed system and provides global users with rapidly query process. For designing the MDBMS, we define the functions of components and design the interaction among them. In a point of view of the global view manager in components, we describe the following 3 cases; (1)the case which the results for the global query are all stored to the global view repository, (2)the case which no result exists in the global view repository, and (3)the case which the partial results we stored to the global view repository. By comparing above cases, we establish the functionalities of our MDBMS through the sequence diagram including the interlace of among objects and the method calling. Finally, we propose the model designed in the concrete by showing the executing procedures of each function using sample query on established functions mentioned above.

• Proceedings of the Korea Multimedia Society Conference
• /
• 2002.05d
• /
• pp.570-573
• /
• 2002

산업 현장에서 광범위하게 사용되고 있는 PCB 조림로봇은 부품정보를 취득하기 위한 초기화 작업에 숙련자의 반나절 이상의 시간이 요구된다. 이를 스캐너 입력 장치를 이용한 영상정보로부터 간단한 마우스 드래그 작업으로 부품 정보를 취득할 수 있게 하고, 취득되어진 정보는 데이터 베이스와 연동되어 관리가 가능하며, RS232를 사용하여 직접 로봇에 다운로드 하는 방법을 제안한다.

• 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.

• The KIPS Transactions:PartD
• /
• v.11D no.4
• /
• pp.747-754
• /
• 2004

Database administrators should be aware of performance characteristics of database systems in order to manage database system effectively. The usages of system resources in database systems could be quite different under database workloads. The objective of this paper is to identify and analyze performance characteristics of database systems in different workloads, which could help database tuners tune database systems Under the TPC-C and TPC-W workloads, which represent typical workloads of online transaction processing and electronic commerce respectively, we investigated usage types of resource that are determined by fourteen performance indicator, and are behaved in response to changes of four tuning parameters (data buffer, private memory, I/O process, shared memory). Eight out of the fourteen performance indicators cleary show the performance differences under the workloads. Changes of data buffer parameter give a influences to database system. The tuning parameter that affects the system performance significantly is the database buffer size in the both workloads.

• 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.

• Journal of the Korean Society for information Management
• /
• v.6 no.2
• /
• pp.87-103
• /
• 1989

In this study, A DDC online system was developed which provides subject access and browsing function for class numbers or subject terms. A knowledgebase of the DDC Schedules and Relative Index was designed for this purpose using IBM-PC. From the DDC 20th edition, subjects from 004 to 006, covering‘data processing’,‘computer science’‘programming and progrms’, and etc., were selected for this experiment. DDC schedules are represented as a frame structure which is apt to describe hierachical structures. This experiment, joining the DDC to the information retrieval environment of an online catalog, will contribute to the future of the online DDC system by providing possiblities for search strategies not feasible through the alphabetical approach of subject headings and keywords presently supported by online catalogs.

• Journal of the Korean Society for information Management
• /
• v.26 no.4
• /
• pp.7-34
• /
• 2009

Structures of stories, paragraphs, and sentences and inferences applied to indexing and searching were studied to construct the full-text and sentence retrieval system for storytelling. The system designed the database of stories, paragraphs, and sentences and the knowledge-base of inference rules to aid to write the story. The Knowledge-base comprised the files of story frames, paragraph scripts, and sentence logics made by mark-up languages like SWRL etc. able to operate in semantic web. It is necessary to establish more precise indexing language represented the sentences and to create a mark-up languages able to construct more accurate inference rules.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2007.10a
• /
• pp.917-920
• /
• 2007

In this paper, we designed the authentication system for home network service and applied it to actual sensor nodes. SNEP protocol of SPINS provides confidentiality of data and authentication. We achieved authentication key, encryption and decryption applied RCS encryption algorithm of SNEP. In addition, we used pair-wise key pre-distribution for prevention of authentication sniffing in wireless sensor network. The experiment environment consists of a base station receiving data and sensor nodes sending data. Each sensor nodes sends both the data and encrypted authentication key to the base station. The experiences had shown that the malfunction doesn't happen in communication among other groups. And we confirmed in tests that the system is secure when a sensor having malicious propose is added.

• Journal of KIISE:Computing Practices and Letters
• /
• v.5 no.6
• /
• pp.663-673
• /
• 1999

WWW에 있어서 데이타베이스 통로는 필수적이다. 데이타베이스를 이용한 대부분의 웹 서비스는 CGI를 통해서 이루어지고 있는데 본 논문에서는 CGI가 갖는 문제점을 근본적으로 해결하기 위한 프레임웍으로서 JAQS(JAva Query Stub)를 제안하고 있다. JAQS를 통하여 이루어지는 서비스는 HTTP의 비연결성(connectionless) 및 무상태성(stateless)을 극복함으로써 상태 및 트랜잭션 관리를 지원할 수 있음은 물론 자바언어로 구현되어 플랫폼 독립적인 구조와 다중쓰레드를 최대한 활용하고 있다. 또한 JAQS와 함께 제안하고 있는 JAQS 관리자를 이용하면 데이타베이스가 분산되어 있는 환경에서도 효율적으로 동작할 수 있는 구조로 이루어져있다.Abstract Database gateway is absolutely vital to web-based services. Most web-based services with DBMS are implemented using CGI(Common Gateway Interface). This paper proposes a framework, dubbed JAQS(JAva Query Stub), as a solution for problems of CGI. JAQS not only supports state/transaction management by overcoming the connectionless and stateless nature of HTTP, but also effectively guarantees platform/DBMS-independence and multi-threading abilities because JAQS is implemented using Java. Also, using the JAQS Manager additionally proposed in this paper, JAQS can operate efficiently even in distributed database environments.

• Proceedings of the Korean Information Science Society Conference
• /
• 2002.04a
• /
• pp.511-513
• /
• 2002

본 논문에서는 효율적으로 원격 시스템의 자원을 활용하기 위하여 네트워크 상에 있는 시스템을 관리하는 관리 시스템 모델을 제안한다. 각 시스템의 자원 상태를 주기적으로 검사. 기록하고, 이를 바탕으로 사전에 문제점을 예측하고 문제 발생 시 적용하며, 관리 정보를 교환함으로써 효율적인 자원의 재분배를 가능하게 한다. 제시하는 관리 시스템 모델은 단순 망 관리 프로토콜의 개념을 확장한 것으로서, 관리 대상을 시스템 및 네트워크로 확장하여 이를 위한 관리 정보 베이스 객체를 새롭게 규명한다. 뿐만 아니라, 단순한 상태 보고가 아닌, 결함 처리, 이벤트 처리, 오프라인 상태 관리, 과거 기록 교환 등으로 그 기능 영역을 확대하고 이를 위한 종합적인 정보 교환 메시지 형식을 새롭게 정의한다.