• Journal of Korea Society of Industrial Information Systems
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• v.1 no.1
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• pp.63-85
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• 1996

This paper describes the applications of genetic algorithm to nonlinear constrained optimization problems. Genetic algorithms are combinatorial in nature, and therefore are computationally suitable for treating continuous and idstrete integer design variables. For several problems , the conventional genetic algorithms are ill-defined , which comes from the application of penalty function , encoding and decoding methods, fitness scaling, and premature convergence of solution. Thus, we develope a hybrid genetic algorithm to resolve these problems and present two examples to demonstrate the effectiveness of the methodology developed in this paper.

• Journal of Korea Society of Industrial Information Systems
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• v.1 no.1
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• pp.1-27
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• 1996

본 연구는 혁신도입에 관련된 선행연구를 바탕으로 정보시스템 개발팀의 소프트웨어 개발기법 도입현상을 혁신결정설계와 지식장애가설을 이용하여 분석하였다. 동일한 혁신도 도입하는 조직에 따라 다르게 인식되며 그 인식의 차이를 선행연구에서 사용되던 속성들이 아닌 지식차이로 측정하여 도입에 미치는 영향을 조직변수와 함께 규명하고자 하였다. 설문대상은 종업원 1000명 이상의 제조업체로 한정하였고, 자료는 설문 컴퓨터 프로그램을 개발하여 수집하였으며 분석에는 판별분석과 경로분석을 활용하였다. 연구결과를 살펴보면 지식장애가 개발기법의 도입에 영향을 미치기는 하나 도입현상을 전부설명하지는 못하는 것으로 나타났다. 조직변수로는 집권화가 교육훈련투자가 개발기법 도입에 영향을 미치는 거승로 분석되었다.

• Journal of Korea Society of Industrial Information Systems
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• v.1 no.1
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• pp.119-233
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• 1996

본 논문에서는 게이트의 길이가 0.25$\mu\textrm{m}$dlsGaAs HEMT(High Electron Mobility Transistor)를 이용하여 11.7GHz-12.2GHz 대역 위성통신용 수신기를 설계하였다. 설계된 수신기의 전체이득은 38dB 이상, 잡음지수 1.8dB 이하, 입출력단의 반사손실은 -10dB 이하를 보였다. 수신기는 저잡음증폭기(LNA), 중간주파수증폭기(IFA) , 믹서(Mixer), 국부발진기(LO) 로 구성되어 있으며 LO 주파수와 IF 주파수는 각각 10.75GHz 와 0.95GHz-1.45GHz이고 칩의 크기는 1.7mm $\times$2.5mm이다.

• 한국디지털정책학회:학술대회논문집
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• 2003.12a
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• pp.263-273
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• 2003

Recognizing the importance of the database query optimization design methods, we implemented mobile database with mobile program (J2ME) which is a useful database procedures. In doing so, we emphasize the logical query optimization which brings mobile database to performance improvement. The research implies that the suggested mobile program (J2ME) would contribute to the realization of the efficient mobile database as the related technology develops in the future.

• Proceedings of the Korea Association of Information Systems Conference
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• 2004.11a
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• pp.393-400
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• 2004

Since IT industry has changed very rapidly in technology, market environments, the online community raise new space. However, there have been scanty researches on the on-line community. The primary purpose of this research is to develop and test a model that explains the effect of participatory motives and social influence in on-line community on commitment.

• The Journal of Information Systems
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• v.7 no.1
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• pp.159-180
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• 1998

User-led IS development contributes to the response of actual user needs, the alternative solution for backlog, and including the enhanced communication and the reduced role conflict between users and DP department. However, there are too little research and practical concern about the user-led IS development. This case study on the Korea Real Estate Investment Trust addresses to the development background, IS development process, and the qualitative and quantitative benefit of user-led IS development. We believe that the case study contributes to the understanding for the benefit of user-led IS development approach.

• Proceedings of the Korea Association of Information Systems Conference
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• 2005.12a
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• pp.443-454
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• 2005

The purpose of this study is to show the operations and implementations of ASP web database which uses open-source web site packages called bighitonline video shop. Some literature reviews have been done to reveal robust theoretical background for this research And also, some basic experiments as Preparatory Processes have also been made by using some softwares such as Windows XP professional, IIS, MS SQL Server and others. The main purpose of these experiments is to show strong theoretical and practical backgrounds. These experimental results in the micro-level showed to be successful to understand the Interrelations of web components and web-site architectures.

• International Journal of Fuzzy Logic and Intelligent Systems
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• v.4 no.3
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• pp.271-276
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• 2004

This paper is a research on the dynamic signature verification of error rate which are false rejection rate and false acceptance rate, the size of signature verification engine, the size of the characteristic vectors of a signature, the ability to distinguish similar signatures, the processing speed and so on. Also, we present our efficient user interface and performance results.

• ETRI Journal
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• v.33 no.5
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• pp.806-809
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• 2011

This letter considers the channel estimation for two-way relay MIMO OFDM systems. A least square (LS) channel estimation algorithm under block-based training is proposed. The mean square error (MSE) of the LS channel estimate is computed, and the optimal training sequences with respect to this MSE are derived. Some numerical examples are presented to evaluate the performance of the proposed channel estimation method.

• Journal of Korea Society of Industrial Information Systems
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• v.4 no.2
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• pp.39-43
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• 1999

We consider generalized exponential regression model with randomly censored data and propose a modified Fisher scoring method which estimates the model parameters. For this, the likelihood equations are derived and then the estimating algorithm is developed. We illustrate the proposed method using a real data.