• The Journal of Korean Institute of Communications and Information Sciences
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• v.15 no.11
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• pp.898-908
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• 1990

This paper applies the moment method to analyze the transverse electromagnetic(TEM) cell with an inner conductor (septum) of arbitrary rectangular shape and location by employing quast static approximation. The EM field and the characteristic impedance so obtained are shown to be in good agreement with the available data from the previously published papers about the typical TEM cell structure with center septum of zero thickness.

• Journal of Convergence for Information Technology
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• v.10 no.6
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• pp.128-139
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• 2020

The purpose The purpose of this study was to compare and observe research trends of sex education for young children·elementary school students·middle school students, provide base material for research on sex education, and present research prospects and tasks for the future. For this, 30 theses from Korean journals related to sex education for young children·elementary school students·middle school students from years 2000 to 2019 were extracted and analysis was conducted on the general trends (by research period and by academic field) of sex education and they were categorized by research topic, by research subject, and by research method. Research results showed that, with research period, research increased in the mid-2000s and with journal trends by research subject, and was published in 24 journals. Second, with regard to research topic aspects, most studies looked into 'sex education perceptions and conditions' and research dealing with 'gender concept development' and 'program development and teaching method strategies' also increased. Third, in terms of the research subjects, there were 9 papers for children, 6 papers for elementary students, 14 papers for middle school students, 2 for high school students, and 9 papers for teachers and parents. Fourth, with trends according to research methods, the quantitative research method of 'questionnaires' was used most and following were 'literary studies' and 'interviews', in that order. Reflecting these research results, discussions were presented and proposals for future studies were made.

• The Journal of Society for e-Business Studies
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• v.4 no.3
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• pp.95-118
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• 1999

There have been many research papers and practical implementations on the various EC(Electronic Commerce) aspects such as merchant system, security, payment gateway, legal and policy issues. However, it is very hard to find the systematic approaches and business process models from the viewpoint of the company willing to start B2C(Business-To-Customer) EC. Therefore, we develop business process models for the planning, systems analysis and design, implementation, and operation of internet shopping mall to suggest a guideline and reference model for the realization of successful B2C EC.

• Proceedings of the KIEE Conference
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• 1989.07a
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• pp.651-654
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• 1989

A rate equation model describing the ultrashort pulse formation is presented. The temporal and energy behavior of the distributed feedback dye laser predicted by the model has been compared the earlier papers on DFDL's. The observed good agreement allows application of the theoretical model for picosecond laser.

• 전기의세계
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• v.22 no.6
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• pp.24-32
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• 1973

When applying capacitors to distribution line, an effort must be made to determine the economic benefits resulting from the installation of a capacitor. There have been many papers and articles published on the economics of capacitors. Most of these are special cases, or have so many qualifications that they are not much use for other cases unless very careful attention is given to minute details. A general economic analysis on a distribution line is very complicated problem. Consequently, a diagram solution is illustrated for determining the economic condenser and applying resonably well for the distribution line with any load division.

• Proceedings of the KIEE Conference
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• 1998.07a
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• pp.137-139
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• 1998

Electrical service faults and momentary voltage variances may result in a costly shutdown. This papers present the degree that power qualify variance have an effect on the performance of induction motor.

• Proceedings of the KIEE Conference
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• 1998.11b
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• pp.410-412
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• 1998

Some resent papers deals with the solution of LTI singular systems described in state-space via orthogonal functions. There are some complexity to derive the solution because all the previous works[2]-[5] used orthogonal function's integral operation. Therefore, in this paper, some new results are introduced by using a differential operation of orthogonal function to solve the LTI singular systems.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.32 no.1
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• pp.90-97
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• 2004

• Proceedings of the Korea Air Pollution Research Association Conference
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• 1999.10a
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• pp.387-389
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• 1999

최근 인구증가와 더불어 도시화, 산업화 및 생활수준의 향상으로 인해 가정 및 사업장 등에서 배출되는 폐기물의 발생량이 급속하게 증가함으로써 폐기물 처리에 따른 비용절감과 효율적인 폐기물 처리방법들이 중요시 되어지고 있다. 현재 우리 나라에서 폐기물 처리법으로 가장 많이 활용되고 있는 기술은 매립을 이용하는 것이다. 매립처리는 인구에 비하여 국토가 협소한 우리 나라에서는 조만간 막다른 벽에 부딪칠 것이고, 유기물이나 유해물질의 매립은 환경을 오염시키다.(중략)

• Honam Mathematical Journal
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• v.20 no.1
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• pp.135-145
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• 1998

In this paper, we focus on the convex-valued selection theorem out of four main selection theorems; zero-dimensional, convex-valued, compact-valued, finite-dimensional theorems based on Michael's papers. We prove some theorems about lower semi-continuous set-valued mappings, and derive some applications to closed continuous set-valued mappings and to functional analysis. We also give a partial solution to the open problem posed by Engelking, Heath, and Michael.