CORBA 환경에서 구현 언어에 따른 데이터베이스 접근 성능 평가

박우창 덕성여자대학교 자연과학연구소 2000 자연과학 논문집 Vol.6 No.-

CORBA is a standard for distributed object computing and it is shown that many application programs can be integrated and cooperated on distributed and heterogeneous environments. In this paper, we have experimented a performance test for various database clients on CORBA environments by its implementation languages. C++ and Java are very common implementation languages for servers and clients. By the experiment the Java server shows low peformance compared to C++ server but the Java client's performance is not more slow than C++'s. We show more performance index for distributed object system like RMI for implementors to choose the implementation language.

데이터베이스 스키마 통합을 위한 XSLT 연산

박우창 덕성여자대학교 자연과학연구소 2002 자연과학 논문집 Vol.8 No.-

In distributed computing environments, there are many database applications that should share data each other such as data warehousing and data mining with autonomy on local databases. The first step to such applications is the integration of heterogeneous database schema, but there is no accepted common data model for the integration and also are difficulties on the construction of integration program. In this paper, we use the XML Schema for the representation of common data model and exploit XSLT for reducing the programming difficulties. We define the schema integration operations and develop a methodology for the semi-automatic schema integration according to schema conflicts types. Our integration method has benefits on standization, extendibility and reuse on schema integration process comparing to existing methodologies.

웹 브라우저를 이용한 다중 데이타베이스 검색 모델

박우창 德成女子大學校 1996 德成女大論文集 Vol.27 No.-

With the wide spread use of web browsers, many researches are focused on the access of remote databases by web browser, CGI can connect the web browser to the remote databases by calling the API in the database server. In this paper, we present a new model to connect the web browser to the remote databases by CORBA model which is a distributed object management standard. The presented model can naturally expanded to multidatabase system which must connect and interoperate heterogeneous databases in distributed systems. By using Java for the web browser interface, CORBA objects easily connected to web and high level user interface can be provided to the clients. The proposed multidatabase access model by web browser is very well suited to the information environments that is for access-oriented to anonymous clients such as library, tele-education, telemed, etc.

TPC-H와 데이터베이스 교육

박우창 덕성여자대학교 자연과학연구소 2011 자연과학 논문집 Vol.17 No.-

데이터베이스 교육에 있어서 문제점은 적절한 샘플 데이터 모델의 부재이다. 대부분의 샘플 데이터 모델은 아주 간단한 형태이며 실제 업무에서의 데이터와 비교하기 어려울 만큼 튜플 수도 적어 피교육자들이 실제 데이터베이스 업무에서는 적응력이 떨어지는 문제점이 있다. 현업에서 사용하는 데이터 모델이나 데이터는 각 기업이나 응용에 따라 너무 복잡하고 보안 때문에 교육용으로 사용하기는 어렵다. 따라서 데이터베이스 교육에 표준화된 적절 한 규모의 데이터베이스 샘플을 필요로 한다. TPC-H는 DSS 환경에서 데이터베이스의 성능을 측정하는 데이터베이스로 현 업무와 비슷하게 데이터 모델을 구성하였고 데이터도 현 업무와 비슷한 규모이다. 본 논문에서는 TPC-H를 데이터베이스 교육에 필요한 데이터 모델로, 정규화 모델로, 질의 모델로 사용하는 방법을 연구하였다.

상용 데이터베이스에서의 이미지 데이터 검색 지원

박우창 덕성여자대학교 자연과학연구소 2009 자연과학 논문집 Vol.15 No.-

멀티미디어 시스템은 멀티미디어 콘텐츠를 추출하는 기능, 효율적인 저장 기능, 멀티미디어 데이터 내용기반 질의 기능을 제공하며 기존 데이터베이스에 저장된 정보와 유연한 연결 기능을 제공한다. 전통적인 관계 데이터베이스들은 강력한 확장 객체 지향 시스템으로 진화하여 멀티미디어 객체의 저장과 내용기반 검색이 필요한 응용을 지원해왔다. 기존 데이터베이스에 의하여 제공되는 내용기반 검색의 중요한 기술은 사용자 함수를 포함한 사용자 정의 데이터 타입의 제공, SQL 문에서 사용자 함수의 호출이다. 본 연구에서는 상용 데이터베이스 중 오라클 시스템의 예를 보면서 이미지 데이터를 상용 데이터베이스가 어떻게 처리하는지 살펴 본다.

분산객체 개념에 기초한 원격의료 시스템 모델

박우창 덕성여자대학교 자연과학연구소 1998 자연과학 논문집 Vol.4 No.-

One of the problems for integrating geographically distributed medical information is that each site have a computer with its own data model and database system. We suggest a medical information system called TeleMedicine for integrating those databases using distributed object model, CORBA, suggested by OMG. TeleMedicine is an intuitive patient-record system that can support image, audio, and graphical data. It integrates complete patient records with detailed radiographic data, and allows remote sharing of patient and radiological data over networks. Physicians and radiologists in training can use TeleMedicine to learn to analyze specific diseases. TeleMedicine can improve clinical diagnosis and reduce the cost of health care by eliminating the time-consuming and costly activity of data gathering and by enabling easy use of powerful analysis interfaces.

참조 온톨로지 기반 데이터베이스 통합 방법

박우창,이승주 덕성여자대학교 자연과학연구소 2006 자연과학 논문집 Vol.12 No.-

With the increased reliance on database system, there are many database systems that must work together. As data warehouses, data marts, and other OLAP systems added to these environments, the complexity of ensuring the interoperability between systems increases dramatically. Interoperability of database systems can be achieved by capturing the semantics of each system and providing a standardized frameworks for querying and exchanging semantics specifications. Our work focuses on the database integration system based on reference ontology that captures the semantics of data stored in databases, and a mediator that integrates data stored within a company across networks. Our approach suggests an easy and fast database integration method by reducing burdens of complexity of each local database heterogeneity.

인터넷 상거래용 대화형 상담 시스템 설계 및 구현

박우창 덕성여자대학교 자연과학연구소 2003 자연과학 논문집 Vol.9 No.-

Internet Commerce using networked computers is widely used for commercial transaction processing. But the customers are not comfortable in getting information about items on electric shopping mall compared to off-line shops, so there is a need for an interactive cooperative tool for buyer who want some help in choosing and buying on product information. We design and implement an interactive bargaining system between customers and selling consultants. A selling consultant communicate by text or escorted browser with several customers interactively using the system.

알고리즘 교육을 위한 온라인 알고리즘 뱅크 구현

박우창,서여진 덕성여자대학교 자연과학연구소 2004 자연과학 논문집 Vol.10 No.-

With internet technology, e-learning gradually replace the off-line learning. For an e-learning class, many voice and video technics for enhancing student teacher interaction. But for programming exercise courses, it's very difficult to add interactive components via web browser. In this paper, we make and online algorithm bank to manage and search algorithms, build and programming exercise interface on web. Students can edit, compile and execute programs included in online algorithm bank. We also animated some representative programs like sorting, tree traversal, graph traversal, to help student understand those algorithms easily. Online program compile and execution enhance e-learning effectiveness for programming courses and make students feel ease for computer algorithms.

반복적인 집계성폐포 알고리즘의 성능 평가

박우창 德成女子大學校 1996 德成女大論文集 Vol.26 No.-

The aggregative closure, a transitive closure with aggregations on the transitive path, is formally defined using database terms. Of the various algorithms for the aggregative closure, we compare the 3 iterative algorithms, naive, semi-naive, logarithmic algorithm by using 4GL database query language. By the simulation, it is shown that logarithmic algorithm outperforms than other algorithms especially with the problems the aggregative closure operators are not absorptive.