• 한국비블리아학회지
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• 제20권4호
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• pp.191-204
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• 2009

데이터베이스 시스템의 사용자 만족과 품질 관리를 위해서는 사용자 요구사항 및 품질 특성의 정확한 이해와 함께 적절한 품질 측정과 평가가 필수적이다. ISO 25000 시리즈를 기반으로 1차 연구에서 도출된 데이터베이스 시스템 품질 평가 모델에서는 5가지 주품질특성과 이에 따른 21가지 부품질특성, 48개의 내부품질특성의 3단계 계층구조를 제시하였다. 주품질특성, 부품질특성, 내부품질에 대한 우선순위(상대적 가중치) 부여 방법에 대한 연구는 일부 있으나 품질 모형을 데이터베이스 시스템 산업현장에서 직접 사용하는 것은 쉽지 않다. 또한 품질평가를 위한 시간과 비용을 고려할 때 48개 내부품질특성을 모두 평가한다는 것은 현실적으로 거의 불가능하며 데이터베이스 시스템에서 요구되는 무결성 수준에 따라 품질평가의 수준도 다르다. 본 연구에서는 다목표의사결정기법의 하나인 AHP(Analytical Hierarchy Process)기법을 이용하여 데이터베이스 시스템 품질특성을 가중치에 따라 선정하는 방법을 제시하고 이를 통해 품질모형의 현실적인 적용 가능성을 제공할 수 있다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권4호
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• pp.1899-1911
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• 2018

In this work, we propose a concurrency control scheme in object-oriented database (OODB). Since an OODB provides complex modeling power than the conventional relational databases, a concurrency control technique in OODB is also rather complicated and has influence on the overall performance. Thus, it is very important to develop a concurrency control technique with less overhead. The proposed scheme deals with class hierarchy that is a key concept in OODBs. The proposed scheme is developed on implicit locking scheme. Also, the proposed scheme is designed using data access frequency in order to reduce locking overhead than implicit locking. It means that, if access frequency information is not available, the proposed scheme works just like the existing implicit locking, In our work, the correctness of the proposed scheme is proved. The performance is analyzed depending on access types. Also, it is proved that our scheme performs works much better than the implicit locking does.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2006년도 정기 학술대회 논문집
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• pp.216-221
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• 2006

This study provides a methodology for development of the Seismic Damage Evaluation System (SDES) in Korea. Major systems and status of database related to road networks in Korea are investigated to analyze the usability of the required information for developing the SDES. In this study, the SDES is composed of four components that are the road network component, the ground motion component, the fragile structure component, and the cost component. In addition, the procedures for the construction of database which support the SDES is proposed, and a prototype of the SDES for expressway of Korea is developed based on the developed methodology. The National Geospatial Information System (NGIS) and the National Earthquake Information System (NEIS) are used to develop the road network component and ground motion component, respectively. For the fragile structure component and the cost component, Highway Bridge Management System (HEMS) was used.

• 시스템엔지니어링학술지
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• 제3권1호
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• pp.1-7
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• 2007

For the systems engineering process-based development, all requirements of 'Smart UAV Development Program' have been constructed as the database of CORE(R), computer aided systems engineering tool. In this paper, the construction and application of model-based test & evaluation system using those database is described, which prevents omitting essential tests and performing unnecessary rests and enables automatic reflection of database changes and standardization of document formats.

• 대한임베디드공학회논문지
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• 제19권2호
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• pp.115-121
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• 2024

Each ADS must have a validation and evaluation scenario for ODD. This requires a large number of scenarios, so a scenario library must be developed. In order to effectively utilize the scenario library, a system that supports testing in the ODD of the user's choice is required. In other words, in order to develop a scenario library, it is necessary to build a database on actual driving road conditions (geometry, etc.). Accordingly, in this study, we establish a domestic driving environment database based on HD-Map for driving safety testing, design a system that can search test target sections in connection with the ODD of the scenario, and present the implementation results. In the future, it is expected that the domestic driving environment database will be able to create scenarios through linking with the scenario library and directly utilize them for scenario-based evaluation of various demand sources.

• Journal of International Society for Simulation Surgery
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• 제2권2호
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• pp.64-66
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• 2015

Purpose : In this paper we proposed cascade feature filter and projection method for rapid human face recognition for the large-scale high-dimensional face database. Materials and Methods : The relevant features are selected from the large feature set using Fast Correlation-Based Filter method. After feature selection, project them into discriminant using Principal Component Analysis or Linear Discriminant Analysis. Their cascade method reduces the time-complexity without significant degradation of the performance. Results : In our experiments, the ORL database and the extended Yale face database b were used for evaluation. On the ORL database, the processing time was approximately 30-times faster than typical approach with recognition rate 94.22% and on the extended Yale face database b, the processing time was approximately 300-times faster than typical approach with recognition rate 98.74 %. Conclusion : The recognition rate and time-complexity of the proposed method is suitable for real-time face recognition system on the large-scale high-dimensional face database.

• Asia pacific journal of information systems
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• 제7권3호
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• pp.23-37
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• 1997

Although numerous models and solution algorithms to design efficient distributed databases have been developed, very few have been validated for their effectiveness. In this paper, we develop a simulation system which can be used to analyze and validate the average response time of distributed database designs. Our simulation system models comprehensive query processing strategies such as semijoin as well as a concurrency control mechanism We analyze and validate an average response time distributed database design model using our simulation system.

• 정보처리학회논문지D
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• 제12D권1호
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• pp.13-20
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• 2005

조인 연산은 데이터베이스 시스템의 가장 기본적이고 중요한 연산이며, 큰 수행 비용을 필요로 하는 연산이다. 지금까지 효율적인 조인 연산의 구현과 평가를 위한 다양한 연구가 진행되었다. 기존의 조인 연산 평가는 구현자 관점에서 우수한 알고리즘을 규명하기 위해 개발되었다. 본 논문은 사용자 관점에서 조인 연산 성능을 평가하는 조인 연산 평가 방법론을 기술한다. 본 성능 평가는 사용자가 자신의 업무에 적합한 조인 연산을 수행하는 데이터베이스 시스템을 선택하는데 도움을 준다. 본 논문에서는 두 가지 조인 범주와 여섯 가지의 조인 성능 영향 요소를 고려하여 42개의 평가 질의를 제안한다. 마지막으로 제안된 방법론에 따라 두 개의 상용 데이터베이스 시스템을 대상으로 구현하고 성능 평가 결과를 기술하였다.

• 한국문헌정보학회지
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• 제35권2호
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• pp.109-132
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• 2001

본 연구는 객관적으로 검증 가능한 데이터베이스 품질평가 기준 및 방법을 개발하고 과학기술분야 데이터베이스를 대상으로 한 실증적인 실험연구를 목적으로 하고 있다. 평가기준은 데이터베이스 수록데이터 및 데이터베이스 제공서비스의 두가지 측면을 고려하여 전체 18개의 평가항목을 설정하였으며, 데이터베이스의 품질평가는 연구개발정보센터(현, 한국과학기술정보연구원)에서 구축하여 인터넷의 웹 상에서 이용자 서비스를 제공하고 있는 우리나라 과학기술분야의 대표적인 7개의 데이터 베이스를 대상으로 하였고 평가결과를 종합ㆍ분석하여 문제점을 도출하고 향후의 개선방안을 모색하였다.

• Nuclear Engineering and Technology
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• 제35권6호
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• pp.556-565
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• 2003

A quality assurance safety assessment database, called QUARK (QUality Assurance Program for Radioactive Waste Management in Korea), has been developed to manage both analysis information and parameter database for safety assessment of low- and intermediate-level radioactive waste (LILW) disposal facility in Korea. QUARK is such a tool that serves QA purposes for managing safety assessment information properly and securely. In QUARK, the information is organized and linked to maximize the integrity of information and traceability. QUARK provides guidance to conduct safety assessment analysis, from scenario generation to result analysis, and provides a window to inspect and trace previous safety assessment analysis and parameter values. QUARK also provides default database for safety assessment staff who construct input data files using SAGE(Safety Assessment Groundwater Evaluation), a safety assessment computer code.