• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2010년도 추계 학술발표회
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• pp.1274-1281
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• 2010

Cut Slope Management System(CSMS) is a systematic maintenance and management system designed to prevent the collapse of cut slopes located along national roads and to minimize damages caused by slope collapse related accidents. In order to implement a maintenance and management system that will ensure safe road operation, the Korean government has started the inventory of cut slopes and developed a cut slope database since 2006. The study on the application of cut slope database is on-going and part of this study is the development of cut slope database management system (Slope-navi) using GIS technology and navigation system for the effective and efficient cut slope management using Information Technology. Using the Navigation Cut Slope Data Management System the previously developed database was checked and verified. The converted cut slope inventory data and field investigation reports of about 20,000 cut slopes were loaded in the navigation map. Through the development of the navigation's cut slope data search system, a systematic and efficient cut slope database management and operation in the prevention of slope collapse and remedial measure selection was established.

• 한국정보처리학회논문지
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• 제7권6호
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• pp.1753-1765
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• 2000

As the areas of computer application are expanded, real-time application environments that must process as many transactions as possible within their deadlines, such as a stock transaction systems, ATM switching systems etc, have been increased recently. The reason why the conventional database systems can't process soft real-time applications is the lack of prediction and poor performance on processing transaction's deadline. If transactions want to access data stored at the secondary storage, they can not satisfy requirements of real-time applications because of the disk delay time. This paper designs a main-memory database prototype systems to be suitable to real-time applications and then this system can produce rapid results without disk i/o as all of the information are loaded in main memory database. In thesis proposed the improved techniques with respect to logging, checkpointing, and recovering in our environment. In order to improve the performance of the system, a) the frequency of log analysis and redo processing is reduced by the proposed redo technique at system failure, b) database consistency is maintained by improved fuzzy checkpointing. The performance model is proposed which consists of two parts. The first part evaluates log processing time for recovery and compares with other research activities. The second part examines checkpointing behavior.

• Journal of Information Processing Systems
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• 제20권3호
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• pp.317-327
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• 2024

Along with the rapid development of the database technology, as well as the widespread application of the database management systems are more and more large. Now the data mining technology has already been applied in scientific research, financial investment, market marketing, insurance and medical health and so on, and obtains widespread application. We discuss data mining technology and analyze the questions of it. Therefore, the research in a new data mining method has important significance. Some literatures did not consider the differences between attributes, leading to redundancy when constructing concept lattices. The paper proposes a new method of uncertain data mining based on the concept lattice of connotation difference degree (c_diff). The method defines the two rules. The construction of a concept lattice can be accelerated by excluding attributes with poor discriminative power from the process. There is also a new technique of calculating c_diff, which does not scan the full database on each layer, therefore reducing the number of database scans. The experimental outcomes present that the proposed method can save considerable time and improve the accuracy of the data mining compared with U-Apriori algorithm.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1995년도 추계학술대회 논문집
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• pp.227-231
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• 1995

This paper describes a basic programming and interfacing modele which can link DataBase form experiments and dynamic analysis program of chock absorber within the limit of adequate reliability. The system developed can provid a user specific Database of shock absorber within the required damping performance and endurable tolerance, thus show a good application possibilities in commercial vehicle design.

• 한국경영과학회지
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• 제24권1호
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• pp.99-117
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• 1999

Since query language is used as a handy tool to obtain information from a database, a more intelligent query answering system is needed to provide user-friendly and fault-tolerant human-machine Interface. Frequently, database users prefer less rigid querying structure, one which allows for vagueness in composing queries, and want the system to understand the intent behind a query. When there is no matching data available, users would rather receive approximate answers than a null information response. This paper presents a knowledge abstraction database that facilitates the development of such a fault-tolerant and intelligent database system. The proposed knowledge abstraction database adepts a multilevel knowledge representation scheme called the knowledge abstraction hierarchy(KAH), extracts semantic data relationships from the underlying database, and provides query transformation mechanisms using query generalization and specialization steps. In cooperation with the underlying database, the knowledge abstraction database accepts vague queries and allows users to pose approximate queries as well as conceptually abstract queries. Specifically. four types of vague queries are discussed, including approximate selection, approximate join, conceptual selection, and conceptual Join. A prototype system has been implemented at KAIST and is being tested with a personnel database system to demonstrate the usefulness and practicality of the knowledge abstraction database in ordinary database application systems.

• 한국전자거래학회지
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• 제3권1호
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• pp.23-41
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• 1998

In a centralized database system, all system components reside at a single platform. In recent years there has been a rapid trend toward the integration of information systems over multiple sites that are interconnected via a communication network, and users' needs are changed to integration of multiple information sites. Multi database System is one of solutions for integrating distributed heterogeneous databases. However the problems in multi database system are restriction in distributed environment support, limitation in integrating heterogeneous media type data, static integration, and data-only of integration. In order to solve these problems, we propose a hybrid database integration model, HyDIM. HyDIM is used for the integrating legacy multimedia data, adopting CORBA, MDS, and mediator. We demonstrate a prototype system far PDM application domain.

• 대한전기학회논문지:전력기술부문A
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• 제53권5호
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• pp.257-265
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• 2004

The complex documentation involved in power system analysis software require a well-defined and friendly database system. We have developed an object-oriented database management system for power system analysis, and have described load flow analysis and transient stability analysis using object-oriented database(OODB). Database management systems are widely used and achieve high reliability of data management in the engineering fields. However relational database system have shortcomings in application to power system analysis. ill relational database, the data model is too simple for modeling complex data and database languages are very different from programming languages. Object-oriented techniques are sufficiently powerful to support data-modeling requirements of GUI applications. The GUI is implemented using C++ on a MS windows platform. The OODB supports data modeling requirements of GUI applications and the performance is well acceptable for Gill applications.

• 산업기술연구
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• 제18권
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• pp.343-353
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• 1998

Effective design of a database is essential for operating application systems efficiently. This paper discusses database design for a geographic information system. This goals of database design are multiple: to satisfy the information content requirements of the specified users and applications; to provide a natural and easy-to-understand structuring of the information; and to support processing requirements and any performance objectives such as response time, processing time, and storage space. Database design is a very complex process and is decomposed in three phases: conceptual, logical, and physical design. In this paper, we first collect and analyze the requirements for a geographic information system. We also perform database design for these requirements through the three design phases systematically. Our results would contribute to the effective construction of a database for a geographic information system.

• 정보보호학회논문지
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• 제30권3호
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• pp.369-378
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• 2020

모바일 기기의 보편화로 스마트폰 보급률 및 사용률이 계속해서 증가하고 있으며, 애플리케이션에서 저장 및 관리해야 할 데이터 또한 증가하고 있다. 최근 애플리케이션은 효율적인 데이터 관리를 위해 모바일 데이터베이스를 이용하는 추세이다. 2014년 개발된 Realm 데이터베이스는 지속적인 업데이트와 빠른 속도, 적은 메모리 사용, 코드의 간결함과 가독성 등의 장점을 바탕으로 개발자들의 관심이 증가하고 있다. 또한, 데이터베이스에 저장된 개인정보의 기밀성과 무결성을 제공하기 위해 암호화를 지원한다. 하지만 암호화 기능은 안티 포렌식 기법으로 사용될 가능성이 있으므로 Realm 데이터베이스가 제공하는 암·복호화 동작 과정 분석이 필요하다. 본 논문에서는 Realm 데이터베이스의 구조와 암·복호화 동작 과정을 상세히 분석하였으며, 분석 내용에 관한 활용 사례를 보이기 위해 암호화를 지원하는 애플리케이션을 분석하였다.

• 디자인학연구
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• 제12권4호
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• pp.283-292
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• 1999

최근 들어 네트 을 활용할 수 있는 사회기초 기반구축의 빠른 진척과 더불어 교육환경에서 네트 및 멀티미디어 서비스의 활용에 대한 대내외적 요구는 빠른 속도로 증가하고 있는 반면, 이러한 요구를 충족시켜줄 만한 디지털 시스템을 기반으로 하는 교육 시나이로에 대한 연구는 그 다지 쉽게 찾아 볼 수 없는 실정이다. 특히 시청각 교육을 위주로 하는 교육환경(미술, 디자인 등)에서의 디지털 시스템의 활용에 관한 연구는 데이터베이스의 구조에 관한 연구를 제외하고는 거의 전무한 형편이다. 21세기의 국가 디자인 경쟁력 향상을 위해서도 산재되어 있는 디자인 자료를 디지털화 하여 언제 어디서나 열람할 수 있게 하는 시스템의 개발이 시급한 때이다. 따라서 본 연구에서는 다음과 같은 세 가지의 목적을 가지고 수행되었다. 첫째, 디자인 데이터 베이스 구성요소 추출 및 분류체계 개발. 둘째, 디자인 데이터 베이스 구성요소 추출 및 분류체계 개발. 마지막으로, 디자인 데이터 베이스 활용 방법 개발. 본 목적에 의거하여 두 가지 방향성에 의하여 기초 조사가 수행되었다. 첫째는 기존의 디자인 분류 체계에 관한 체계적 분석이었으며, 둘째는 기초 조형 교육의 교육내용 및 과정분석이 이루어 졌다. 분석된 결과를 토대로 본 연구에서는 다음과 같은 결과를 얻을 수 있었다. 첫째, 디자인 데이터의 감성적 평가에 대한 교육적 요구를 수용하기 위하여 이미지 데이터에 고정적 구성요소이외에 감성요소를 수용할 수 있는 가변적 구성요소를 부가하여 구조를 설계하였다. 둘째, 디자인 데이터 베이스를 운용하여 기초 조형 교육에 활용할 수 있는 체계를 개발하였다. 그리고 마지막으로, 디자인 데이터 베이스 활용 Application의 프로세스가 시나리오 기반 디자인 방법론에 의거하여 개발되어 졌으며, 또한 그에 합당한 UI 도 개발되어졌다.