• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 1997.05a
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• pp.25-29
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• 1997

In many solute transport studies, either flux or resident concentration has been used. Choice of the concentration mode was dependent on the monitoring device in solute displacement experiments. It would be questionable, however. to accept the equivalency in the solute transport parameters between flux and resident concentrations in structured soils exhibiting preferential movement of solute. In this study, we investigate how they differ in the monitored breakthrough curves (BTCs) and transport parameters for a given boundary and flow condition by performing solute displacement experiments on a number of undisturbed soil columns. Both flux and resident concentrations have been simultaneously obtained by monitoring the effluent and resistance of the Horizontally-positioned TDR probes. The study reveals that soil columns having relatively high flux densities exhibited great differences in the degree of peak concentration and travel time of peak between flux and resident concentrations. The peak concentration in flux mode was several times higher than that in resident one. This was mainly due to the bypassing of solute through soil macropores.

• Journal of the military operations research society of Korea
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• v.10 no.2
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• pp.33-41
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• 1984

Hangout programming language, written in Hangout and having syntax of Korean, can enhance readability very much for its naturalness, and is suited for Hangout data processing. But there exist several problems in implementing it due to the peculiarities of Korean such as verb position, variation of termination. This paper proposes a solution for implementing Hangeul high level language and introduces a Hangout programming language HANSFOR (Hangout Structured Fortran), implemented according to the proposed method. HANSFOR satisfies such requirements of Hangout high level language as mentioned above and can handle Korean and Chinese character data efficiently. Especially, though it is based on Fortran, it is free-formatted and provides structured programming concept to compensate for defects of original Fortran. It is successfully implemented on NEC S/100.

• 제어로봇시스템학회:학술대회논문집
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• 1993.10a
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• pp.672-678
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• 1993

The bead shape in high frequency electric resistance (HER) pipe welding gives important information ons judging current welding state. In most manufacturing process, the heat input is controlled by skilled operators observing color and bead shape. We proposed the bead shape monitoring system in HERW pipe process by using structured light beam. We reconstructs 3-D shape of bead from the measured data, and compare this shape with real 3-D shape obtained by coordinate-measuring machine. This experiment results show that the proposed system can monitor the bead shape with good accuracy.

• International Journal of Control, Automation, and Systems
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• v.3 no.spc2
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• pp.363-375
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• 2005

The paper describes some of the challenges that face the control of nonlinear interconnected power systems. The challenges include the selection of appropriate control and information structures that could range from a completely decentralized to a fully centralized structure. Once a structure is proven to be feasible, the effectiveness of control signals needs to be assessed. Analytical tools are derived for this purpose in the first part of the paper, and they are illustrated with a case study that involves the design of a damping decentralized controller using a Thyristor Controlled Series Compensation device. The second part of the paper deals with the load following and tracking problem through automatic generation control for a system that has been re-structured or deregulated. This problem can be solved using a completely decentralized scheme. It is solved here using fuzzy rules and with an emphasis on compliance with NERC's standards and reduction of wear and tear of the equipment. It is illustrated with a test system that has three interconnected control areas. Finally, comments on the economics of control and the author's vision are presented.

• Journal of the Korean Institute of Telematics and Electronics B
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• v.32B no.1
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• pp.21-29
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• 1995

In this paper, a independent and structured microassembler was designed for easily changing the system design, and for designing various microarchitecture. When the designer's hardware and microprogramming process were made concurrently, it is needed to easily change or improve the instruction set and executable code format. But this type of developed environment requires a high const and a large software system. A proposed microassembler was designed so the designer directly defines the microinstruction set and format to be executed. And we implemented a module from each part of the software, so it is now possible to use practically and upgrade the function of each part, First, the symbol was separated from the assembler. And then microinstruction was copied into it. The microinstruction format was designed using the defined language that was designed for free microinstruction. This was implemented in an IBM-PC by using the C-language, FLEX,and BISON.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.28 no.5
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• pp.195-201
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• 2016

Enhanced tubes are widely used in air-conditioning and process industries. Structural tubes having three-dimensional roughness are well known to be able to significantly enhance pool boiling heat transfer of refrigerants. In this study, five structural enhanced tubes having different fin density, fin height, and fin gap width were tested using R-134a. Results showed that the heat transfer coefficient was increased with increased fin density. Within test range, the effect of fin height on pool boiling heat transfer coefficient was insignificant. The heat transfer coefficients of the optimum configuration (2047 fpm, 0.21 mm gap width) tube were lower than those of other commercial enhanced tubes. This might be due to the larger fin gap width of the present enhanced tube.

• Journal of the Korean Geographical Society
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• v.35 no.4
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• pp.549-563
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• 2000

본 연구는 전통적인 교사위주의 설명식 수업을 벗어나 인터넷을 학습에 보다 효과적으로 활용하는 방법을 모색해 보고자 하는 것이다. 이를 위해 인터넷을 통하여 정보를 수집한 후에 그 내용을 재구성하여 홈페이지를 구축한 후 실험수업을 실시하였다. 실험수업의 결과 전통적인 수업반보다 인터넷 홈페이지를 활용한 수업반 학생들의 학업성취수준이 훨씬 높게 나타났다. 한편 인터넷 홈페이지를 활용한 실험수업밥의 겨우 구조적 수업반에 비해 비구조적 수업반 학생들의 학습성취도가 더 높게 나타났으나 그 차이는 유의적이지 않았다. 또한 수업 흥미도, 만족도, 학습의욕 등에도 실험반 학생들은 상당히 긍정적인 평가를 보였다. 본 연구를 통해 지리수업의 학습효과를 높이고 학생들의 흥미도를 높이기 위해서는 인터넷을 활용하는 수업형태가 바람직하다는 결과를 도출하였다. 특히 본 연구를 통해 앞으로 학생들의 학업성취도와 흥미도를 높이기 위해 인터넷을 수업에 활용하는 교수-학습설계의 개발이 필요함을 보여 주었다.

• Journal of the Korean Home Economics Association
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• v.28 no.3
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• pp.161-170
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• 1990

The purpose of this study is to clarify the degree of support of familism in rural families. Research procedure was carried out in two steps. First, comprehensive interviews were made with 9 opinion leaders of the village on the villagers' overall attitudes towards familism. Second, structured interviews were made with 316 married adult villagers on attitude towards familism. The survey instrument used for this study was the Familism Scale. Data were collected by structured questionnaire through direct interviews with the subjects. The following conclusions were drown from this study. 1) Married adults in rural families were found to support familism comprehensively. 2) There was no difference by sex in the variables affecting familism. 3) The more aged were found to support familism more strongly. 4) The less educated were found to support familism more strongly.

• 한국정보디스플레이학회:학술대회논문집
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• 2008.10a
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• pp.254-257
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• 2008

We have investigated the effect of source/drain electrode deposition method on a performance of top gate structured ZnO TFT performance. TFT using S/D of ITO film, consisted of bi-layer which deposited by ion beam assisted sputtering at the initial stage then deposited by DC magnetron sputtering, showed better performance compared to that using S/D of ITO deposited by just DC magnetron sputtering. Two ITO films exhibited different grain shapes and these resulted in different etching properties. We also suspect that charge trapping on the glass substrate (back channel) during the ITO film deposition may influence the characteristics of top gate structured ZnO TFT.

• Journal of The Korean Digital Architecture Interior Association
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• v.2 no.1
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• pp.24-31
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• 2002

The purpose of this study was to analyze the transition on architectural data such as valid indoor length, module, ratio of core, floor height, ceiling height and the type of structured cabling system according to the intelligent building grade through case study of the intelligent office buildings constructed in Korea since 1980. The results of this study were as follows. The average floor height was 3.80m, and it was higher in proportion to the IB grade. The average ceiling height was 2.57m, and it didn't have connection with the IB grade. The module of high frequency in application was $3.0{\times}3.0m$, and it showed 25% in the application frequency. The average valid indoor length was 12.27m. The average ratio of core was 24.49%. The type of high frequency in application for the structured cabling was Access Floor Type, and it showed 31% in the application frequency.