• Current Photovoltaic Research
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• v.4 no.4
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• pp.131-139
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• 2016

This paper shows the series power device in the massive roof-top PVs and domestic loads. D-UPFC as the series power device controls the distribution voltage during voltage rise (or fall) condition. D-UPFC consists of the bi-directional ac-ac converter and the transformer. In order to verify the D-UPFC voltage control, the distribution model is used in the case study. D-UPFC enables the voltage control in the distribution voltage range. Dynamic voltage control from voltage rise and voltage fall conditions is performed. Scaled-down experimental test of the D-UPFC is verified the voltage control and it is well performed without high voltage spikes in the inductive load.

• Journal of the Korean Graphic Arts Communication Society
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• v.5 no.1
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• pp.1-10
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• 1987

This paper proposes a design for the software of Graphic system for CAD/CAM, Particularly, 2D Graphic system is studied.The implemention has been tested by GSS PC24 computer and GW-BASIC is used as program language.The system is designed with basic modules of CAD using Top-down method.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1992.04a
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• pp.293-296
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• 1992

개념설계, 설계해석, 상세설계, 가공성과 조립성검토, 도면제작 및 소요 BOM 작성등의 제품설계 각 공정들간 Data 유통과정을 상위수준에서 체계적으로 관리하고 제어하는 엔지니어링 데이타베이스 의 개발에 관하여 기술하였다. 특히, 엔지니어링 업무에 가장 많이 이용되는 상세설계공정을 중심으로한 데이타 베이스를 보여주고 있다.

• Proceedings of the CALSEC Conference
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• 2004.02a
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• pp.332-335
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• 2004

Issues ·Bottom-up v.s. Top-down Development ＆ Evaluation ·Syntax-Directed v.s. Conceptual Modeling -Reusing and Easy understanding -User friendliness and Concrete Rules ·No Aligned Rules and Guidelines for Developing Document Structures from Conceptual Information Models(omitted)

• Magazine of the Korea Concrete Institute
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• v.25 no.2
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• pp.45-48
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• 2013

• 전기의세계
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• v.39 no.6
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• pp.35-41
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• 1990

Computer Aided Robot Simulation & Off-Line Teaching System개발은 CIM의 중추적 역할을 담당하고 제품설계 단계에서부터 생산으로 이어지는 Top-Down적 flow를 구축했다는데 의의가 있으며, 본 적용 과정을 통해 Off-Line Syste의 문제점 및 한계를 인식하고 반드시 극복해야될 과제를 얻었다는 성과가 있었다.

• Proceedings of the Korea Technology Innovation Society Conference
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• 2002.05b
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• pp.45-59
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• 2002

최근 들어 접속료가 통신시장의 주요 핵심 이슈로 제기되고 있다. 이에 본 연구는 접속료를 결정하는 다양한 접속료 산정모형 검토를 통해 LRIC 모형이 가장 합리적인 접속료 산정모형임을 밝혀냈다. 또한 LRIC 방식을 도입하기 위해서는 현실 적용이 수월한 Bottom-Up 방식과 Scorched-Node 방식을 가정하여 망 원가를 산정하는 것이 중요하다고 분석되었다.

• 중국학논총
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• no.67
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• pp.101-121
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• 2020

中国近代以来一直由国家主导推进科学普及运动。 甚至把普及科学知识当作建设富强社会主义国家的重要手段, 致力于科学化运动。 本论文将通过中国的科学普及政策和科学化运动的开展过程, 了解科学在中国如何在理念上实现最大化。 另外, 在大众科学的形成过程中, 将探索国家是如何定义和利用科学的, 在科学知识的生产和形成过程中, 大众的地位和作用如何。 为此, 首先将了解新中国国家政策和法规中反映的科学普及运动的内容, 以既是这些政策的理论,思想源流, 又是民国时期中国'科学化运动'堡垒的杂志《科学中国》为中心, 了解中国近代科学普及运动的性质和发展情况。

• Proceedings of the KSR Conference
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• 2011.10a
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• pp.2844-2851
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• 2011

The purpose of this study is to set up an acoustic prediction technique and to perform the IL test of scale down noise reducing device for the development of the noise reducing device as the development of 400km/h class high speed train. First of all, the IL prediction of noise reducing device was performed with the 2D BEM method. And the noise test of scale down noise reducing device in anechoic chamber was performed for the verification of acoustic prediction technique and IL performance evaluation. As the results, the acoustic prediction technique for the development of noise reducing device was verified because the averaged IL difference between prediction and test is in 2dB(A). And the measured IL value of noise reducing device is less than 2dB(A), and additional IL with polyester absorption material is increased about 0.5dB(A).

• Proceedings of the Korean Nuclear Society Conference
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• 1996.11a
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• pp.263-269
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• 1996

A comprehensive scaling method is proposed for a scaled-down facility simulating SBLOCA in the CARR passive reactor (CP-1300). The present method consists of two stages: scaling methodology, and validation of scaling methodology and code. The present scaling methodology is based on the integral response scaling method. Through sensitivity study, the condensation of the top of the CMT is identified as one of the little-known phenomenon with high importance which should be addressed for the applicability of the code. Using the similarity of the derived scaling parameters, the major component geometries of the scaled-down facility are determined. In the case of 1/4 height and 1/100 area ratio scaling, it is found out that the power ratio is the same as the area ratio, and the present scaling methodology generates the design parameters of the scaled-down facility without any distortion.