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ORDBMS를 이용한 데이터 웨어하우스 구축에서 질의어 처리의 성능 향상을 위한 인덱싱 기법
조완섭,이정남,이충세 충북대학교 컴퓨터 정보통신 연구소 1999 컴퓨터정보통신연구 Vol.7 No.2
차세대 DBMS로 각광을 받고있는 객체-관계 DBMS를 사용하여 데이터웨어하우스(data warehouse)를 구축하는 방안과 성능향상을 위한 인덱싱 기법을 제안한다. 지금까지 관계 DBMS와 다차원 분석 도구를 사용하여 데이터 웨어하우스를 구축하는 방안이 주로 제시되었으나, 객체-관계 DBMS를 사용한 데이터 웨어하우스의 구축에 관한 연구는 거의 이루어지지 않고 있다. 데이터 웨어하우스는 기존의 데이터베이스와는 비교할 수 없을 만큼의 대용량 데이터를 가정하므로 객체-관계 DBMS를 이용하여 데이터 웨어하우스를 구축하는 경우 적절한 성능의 보장이 중요한 과제이다. 이 논문에서는 ORDBMS 엔진의 성능향상을 위한 인덱싱 기법을 제안하고, 이를 이용한 질의처리 성능을 분석한다. 제안된 인덱싱 기법을 사용함으로써 질의에 포함된 비용이 큰 조인과 그루핑 연산은 비용이 저렴한 인덱스 액세스 연산으로 대치되며, 데이터의 양과 거의 무관하게 질의 처리비용이 고정되는 효과를 얻을 수 있다. We propose a data warehouse construction scheme based on ORDBMSs and an indexing technique to enhance the performance of the dta warehouse systems. In spite of active research on the construction of relational data warehouses, few research has been done for the usage of ORDBMSs in the data warehouse environments. Since the data warehouse assumes huge amount of data, performance of the systems is a critical issue. In this paper, we propose an indexing technique for the data warehouse systems, and analyze the performance of the query evaluation by using the indexes. Proposed indexing technique replaces costly join and group-by operations by the index access operations having lower cost and fixes the query evaluation cost almost irrelevant to the size of the data warehouses.
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조완섭,김정희 충북대학교 컴퓨터 정보통신 연구소 1998 컴퓨터정보통신연구 Vol.6 No.2
객체지향 데이터베이스를 위한 시각적 질의어(Visual query language)의 설계에서 복잡한 질의조건을 간단하고도 직관적으로 표현할 수 있도록 지원하는 것이 중요한 연구과제가 되고 있다. 본 논문에서는 시각적 객체지향 질의어인 VOQL(Visual Object Query Language)을 제안한다. VOQL은 그래프와 밴다이어그램을 결합한 시각적 표현 기법을 사용하여 객체지향 데이터베이스의 스키마(schema)와 질의어를 하나의 통일된 시각적 표시법으로 표현하며, 객체지향 질의어에 포함된 다양한 객체지향 특성도 간단한 시각적 표시법을 이용하여 표현한다. VOQL의 가장 큰 특징은 기존의 시각적 객체지향 질의어들에 비하여 간단하고 직관적인 구문과 의미를 가지며, 뛰어난 질의 표현력을 가진다는 점이다. Expressing complex query conditions in a concise and intuitive way has been a challenge in the design of visual object-oriented query languages. We propose a visual query language called VOQL (Visual Object-oriented Query Language) for object-oriented databases. By employing the visual notation of graph and Venn diagram, the database schema and the advanced features of object-oriented queries such as multi-valued path expressions and quantifiers can be represented in a simply way. VOQL has such good features as simple and intuitive syntax, well-defined semantics, and excellent expressive power of object-oriented queries compared with previous visual object-oriented query languages.
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탁충습,김완섭,김완종,김형기,남해선,한현각 순천향대학교 사회과학연구소 1999 순천향 사회과학연구 Vol.4 No.2
This study was done for the purpose of making an improved provision for sabbatical year program of the Soonchunhyang university. We made a comparison, between the provision for sabbatical year of Soonchunhyang university and those of other 16 universities in Korea, and proposed a new rule for sabbatical year program. The main features of the reformed plan are as follows. 1) Diversification of sabbatical year program based on a period of time and contents into two categories : research fellowship and reduction of the lecture time for duty per semester. 2) More detailed description of the purpose for sabbatical year program. 3) Relief of the qualification for application. 4) More strict prescription to the number of faculties for sabbatical year. 5) More definite prescription to the faculty's obligations. To be more progressive and competitive in 21st century for Soonchunhyang university, new approaches to program for faculty retraining including the sabbatical year rule are needed.
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지반굴착시 J.S.P 공법에 의한 지반보강 효과에 관한 연구
심태섭,기완서,주승완 조선대학교 국토개발연구소 1997 국토개발연구 Vol.17 No.1
Recently, in order to utilize of underground space, a large scales underground excavation work including large building basements and subway construction have a tendency to increase rapidly in urban areas. This study deals with the horizontal displacement, Bending Moment, Shearing Force of the Propped retaining walls, based on the measuring results which were obtained from two excavation construction stations, and for the purpose of reinforcement of ground and cut-off of ground water behind the Propped retaining wall, high pressure jet grouting is widely used. Therefor the purpose of this paper is to investigate the effects of jet grouting on ground reinforcement and cut-off the ground water behind Propped retaining walls. The results of permeability improved ground were 1×10^-3cm/sec smaller than those of the original ground and the high pressure jet grouting hassufficient effects on reinforcement of ground.
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심태섭,기완서,주승완,김선학 朝鮮大學校 建設技術硏究所 2002 建設技術硏究 Vol.22 No.1
A stable and economical bearing force estmate and the upper load condition and foundation ground characteristics are very important in a case of designing shallow foundation. A typicial field test method which get the coefficient of subgrade reaction to estmate bearing capacity of the earthand sand ground foundation and settlement of the soil and rock foundation with most direct method of the field test methods to estimate bearing capacity, is plate bearing test(PBT). So this study refer's to the calculation characteristics of the bearing capacity and settlement according to plate bearing method of the A field and B field which is practiced in the soil of weathered gneiss and soil reclamation ground, and refers to the reasonable settlement calculation method and bearing capacity estmate and safety examination method suitable to the soil of wethered rock and soil reclamation ground according to the plate bearing test result when we examine the structure safety of same design term by awllowable bearing capacity calculation in the point of view of bearing capacity and settlement. Therefore in the methods to determine yield bearing capacity that is applied to allowable bearing capacity calculation when we design shallow foundation and examine safety by plate bearing test, P-S analysis, logP-logS analysis and logP-S analysis are proper methods and it is proper to examine safety by the point of bearing capacity in the soilground to be able t o find the yield point in the Load-Settlement behavior curve.
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