• 한국디지털정책학회:학술대회논문집
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• 2004.11a
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• pp.185-202
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• 2004

Recent development in wireless computing and GPS technology cause the active development in the application system of location information in real-time environment such as transportation vehicle management, air traffic control and location based system. Especially, study about vehicle location tracking system, which monitors the vehicle's position in a control center, is appeared to be a representative application system. However, the current vehicle location tracking system can not provide vehicle position information that is not stored in a database at a specific time to users. We designed a vehicle location tracking system that could track vehicle location using mobile interface such as PDA. The proposed system consist of a vehicle location retrieving server and a mobile interface. It is provide not only the moving vehicle's current location but also the position at a past and future time which is not stored in database for users.

• The Journal of Information Technology and Database
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• v.3 no.2
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• pp.3-24
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• 1996

In this paper a data replicator scheme with a distributed join architecture is suggested with its cost functions and the performance results. The contribution of this scheme is not only minimizing the number of base relation locks in distributed database tables but also reducing the remote transmission amount remarkably, which will be able to embellish the distributed databse system practical. The differential files that are derived from the active log of the DBMS are mainly forcing the scheme to reduce the number of base relation locks. The amount of transportation between relevant sites could be curtailed by the tuple reduction procedures. Then we prescribe an algorithm of data replicator with its cost function and show the performance results compared with the semi-join scheme in their distributed environments.

• The Journal of Information Technology and Database
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• v.4 no.2
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• pp.79-95
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• 1998

Useful data being distributed over several systems, we have a problem in accessing and utilizing them. Recognizing this problem, researchers have proposed two concepts as solutions to the problem, multidatabase and data warehouse. The one provides a virtual view over the distributed data, and the latter is a materialized view of it. Recently, more attention has been paid to the latter, which is a single of distributed database, collected along a time dimension. So, the major issues in building a data warehouse are 1) how to define a global schema for the data warehouse, 2) how to capture changes from local databases, and 3) how to represent time-varying values of data item. This paper presents an integrated approach to these issues, borrowing the research results from such areas as multidatabase, active databases and temporal databases.

• International Journal of Fuzzy Logic and Intelligent Systems
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• v.5 no.3
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• pp.189-195
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• 2005

One of the major components of any pervasive system is its proactive behavior. Various models have been developed to provide system wide changes which would enable proactive behavior. A major drawback of these approaches is that they do not address the need to make use of existing applications without modifying the applications. To overcome this drawback, a middleware architecture called 'Concord' is proposed. Concord is based on a simple model which consists of Lookup Server and Database. The rewards for this simple model are many. First, Concord uses the existing computing infrastructure. Second, Concord standardizes the interfaces for all services and platforms. Third, new services can be added dynamically without any need for reconfiguration. Finally, Concord consists of Database that can maintain and publish the active set of available resources. Thus Concord provides a solid system for integration of various entities to provide seamless connectivity and enable proactive behavior.

• Journal of the Korea Society of Computer and Information
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• v.22 no.11
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• pp.143-149
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• 2017

In this paper, we propose efficient management method of liberal education for improving computer literacy. We analyzed the actual conditions and factors affecting education and reflected the analysis results in education. The subject of the study is 'Practice Excel', and tested achievement based on computer literacy. In order to evaluate objectively, we conducted CBT(Computer Based Test) based on Computer Specialist in Spreadsheet & Database Level-2. Analysis of the questionnaire included the use of the popular statistical program, IBM SPSS 24 trial, and frequency, ANOVA, t-test, crossover analysis, and correlation. Evaluation results, An important factor influencing educational performance was active participation. It also proved to be very helpful for understanding excel functions & expression.

• Review of KIISC
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• v.6 no.1
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• pp.45-56
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• 1996

본 논문의 목적은 객체지향 데이타베이스(object-oriented database : OODB)의 보안성 확보를 위하여 OODB에 관련된 보안 모델과, 질의 처리시에 보안성 확보를 위한 참조제약 규칙을 제안하는 것이다. 본 논문의 철학은 데이타베이스 모델의 제약사항을 최소화여 융통성을 최대한으로 확보하고, 이들의 보안성 보장은 질의 처리시에 담당하게 함으로서 풍부한 데이타 객체 모델을 가질 수 있을 뿐만 아니라 낙관적인 보안성 확보를 통하여 융통성 있는 질의처리를 도모하였다. 이를 위하여 현실세계의 모든 개체의 특징과 행위를 구체적으로 표현한 추상화 단위로 정의되는 객체를 기밀성에 따라 비밀등급으로 보안 분류하여 보관된 다단계 보안 객체의 모델을 기반으로 한다. 대부분 기존의 보안성 연구의 대상은 수동적인 데이타(passive data)이라면 객체지향 데이터베이스는 능동적인 객체(active object)가 보안성 연구의 대상이 된다.

• Journal of Information Processing Systems
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• v.12 no.3
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• pp.392-409
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• 2016

The aim of this paper is to examine the effectiveness of combining three popular tools used in pattern recognition, which are the Active Appearance Model (AAM), the two-dimensional discrete cosine transform (2D-DCT), and Kernel Fisher Analysis (KFA), for face recognition across age variations. For this purpose, we first used AAM to generate an AAM-based face representation; then, we applied 2D-DCT to get the descriptor of the image; and finally, we used a multiclass KFA for dimension reduction. Classification was made through a K-nearest neighbor classifier, based on Euclidean distance. Our experimental results on face images, which were obtained from the publicly available FG-NET face database, showed that the proposed descriptor worked satisfactorily for both face identification and verification across age progression.

• Journal of the Korea Computer Industry Society
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• v.3 no.2
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• pp.159-166
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• 2002

The amount of information we can obtain from the m is enormous. However, the users are often confused with search results due to irrelevant information, misinformation, insufficient information, etc. This paper proposes a metadata management system trying to facilitate obtaining right information on the Web. Elements of the metadata for Web coursewares are selected and their relationships are identified in order to organize them in a relational database. Procedures to obtain the metadata are implemented in the Microsoft ASP(Active Server Pages). The system provides user-friendly interfaces to give essential information on the Web coursewares and to handle users' enquiries correctly and efficiently.

• The Journal of Korea Robotics Society
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• v.2 no.3
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• pp.221-226
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• 2007

A robust position-sensing system is proposed in this paper for ubiquitous mobile robots which move indoor as well as outdoor. The Differential GPS (DGPS) which has position estimation error of less than 5 m is a general solution when the mobile robots are moving outdoor, while an active beacon system (ABS) with embedded ultrasonic sensors is selected as an indoor positioning system. The switching from the outdoor to indoor or vice versa causes unstable measurements on account of the reference and algorithm changes. To minimize the switching time in the position estimation and to stabilize the measurement, a robust position-sensing system is proposed. In the system, to minimize the switching delay, the door positions are stored and updated in a database. The reliability and accuracy of the robust positioning system based on DGPS and ABS are verified through the real experiments using a mobile robot prepared for this research and demonstrated.

• Proceedings of the Korea Database Society Conference
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• 1999.06a
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• pp.35-47
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• 1999

Raisin Bread Intelligent agents are ninety-nine percent computer science and one percent AI (Etzioni 1990). 에이전트의 정의 An agent is a computer system, situated in some environment, that is capable of flexible autonomous action in order to meet its design objectives (Wooldridge and Jennings 1995). ㆍsituatedness: the agent receives sensory input from its environment and can perform actions which change the environment in some way ㆍautonomy: the system is able to act without the direct intervention of humans and has control over its own actions and internal state. ㆍflexible: responsive, pro-active, social(omitted)