• Journal of Korean Society of Transportation
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• v.22 no.1 s.72
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• pp.83-94
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• 2004

In 1968, United Nation prepared conventions to promote the safety and vitalization of traffic to accomodate increased international business and personal activities. They are convention on rad traffic and convention on road signs and signals. These conventions define the shape, color and the operational guidelines of signs, marking and traffic signals. However, the Korean road traffic law enforces independently the manufactural and operational guidelines of those devices and marking. Due to different regulations described in those two, potential problem might be expected in terms of international traffic in the near future in Korea. This paper presents the academical comparison between these two different road traffic regulations established by the Korean legislature and United Nation. It suggests a list of researches recommended for the nation to be ready to integrate international traffic.

• Environmental engineer
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• s.167
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• pp.19-21
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• 2000

• Proceedings of the KIPE Conference
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• 2018.07a
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• pp.491-492
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• 2018

본 논문은 단방향 AC/DC 비엔나 정류기를 사용한 급속충전기 개발 내용에 대해 기술한다. 3레벨 정류기중 대전류에서 고효율 특성을 가지는 3상 비엔나 정류기의 구성에 대해 서술하고, 급속충전기에 적용이 가능한 입력 3상 220V, 출력 700V의 5kW급 비엔나 정류기 파워스택 시작품을 제작하여 실험을 통해 검증하였다.

• Proceedings of the KIPE Conference
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• 2013.07a
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• pp.202-203
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• 2013

본 논문에서는 넓은 입력 전압 범위를 갖는 비엔나 Z-소스 정류기에 관해 제안한다. 종전의 3상 Z-소스 PWM 컨버터의 경우 THD가 높아 상대적으로 큰 용량의 입력 인덕터가 요구되고, 내앞이 높은 IGBT가 일반적으로 사용된다. 이러한 단점을 극복하기 위해 3레벨 컨버터인 비엔나 정류기와 Z-network를 결합한 비엔나 Z-소스 정류기에 대해 제안하고, 그 타당성을 시뮬레이션을 통해 입증하였다.

• Proceedings of the KIPE Conference
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• 2017.07a
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• pp.80-81
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• 2017

본 논문은 3상 비엔나 정류기의 효율 향상을 위한 전력 반도체 소자 선정 방법을 제안한다. 제안하는 방법은 비엔나 정류기의 스위칭 상태에 따른 전류 특성을 고려하여 전력 반도체 소자를 선정한다. 한 레그에서 스위칭 한 주기에 세 개의 다이오드가 사용되며 직류단 및 중성단 연결된 다이오드는 고속 스위칭을 하고 입력단에 연결된 다이오드는 라인 주파수에 맞춰 저속 스위칭을 한다. 따라서, 다이오드 동작을 고려하여 전력 반도체 소자를 선정하여 비엔나 정류기의 효율을 향상 시킬 수 있다. 제안하는 소자 선정 방법은 실험 결과를 통하여 그 타당성을 확인한다.

• Proceedings of the KIPE Conference
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• 2012.07a
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• pp.309-310
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• 2012

본 논문은 풍력발전시스템의 발전기 측 컨버터로 3상 단방향 전력변환기인 비엔나 정류기를 적용하는 연구에 대하여 기술한다. 본 논문에서는 기존의 발전기 측 컨버터로서, 3레벨의 3상 단방향 정류기인 비엔나 정류기를 적용 하여, 그 효과를 모의해석을 통하여 확인한다. 모의해석은 MATLAB/SIMULINK를 이용하여 풍력발전시스템의 발전기 측을 구현하여 풍력 발전에 적용된 비엔나 정류기 성능을 분석하였다.

• Archives of design research
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• v.12 no.3
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• pp.83-91
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• 1999

In the late 19th century, the desire for pursuing new arts and aesthetics was evolveld and developed in various aspects in europe, and it appealed the characteristics of renovating society such as the arts and crafts movement in England. Vienna was developed in the center of the European empire under these environments, and provided the background as the main center for young artists. Vienna Art Nouveau blossomed under the mind of art pioneers that is "all arts are equal" and the Viennese political, economic, and cultural environments. They tried to show people new aesthetics under the mass-production by accepting machine. The goal of this study is to search the Secessions's role and the environment that make the base of modern aesthetics and differentiate from other Art Nouveau movements in Europe and to verify the meaning and value of that.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.10
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• pp.4561-4568
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• 2011

In this paper, carrier comparison PWM method for voltage control of Vienna rectifier is discussed. In general, in industrial and communications applications, the two-level rectifier is used. However, this two-level rectifier has the limit of high THD and low efficiency. So, the studies of three-level rectifier has been carried out so far, and the Vienna rectifier circuit is the representative. The space vector pulse width modulation(SVPWM) method is generally used for Vienna rectifier, in which voltage vectors and duration time are calculated from the voltage reference. However, this method require very sophisticated and complex calculations, so realizing this method by software is very difficult. To overcome this disadvantage, simple carrier comparison PWM method for Vienna rectifier is proposed which is modified from the carrier comparison method for 3 level inverter. Furthermore, to verify the usefulness of the Vienna rectifier carrier comparison PWM the simulation and experiment are carried out.

• Archives of design research
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• v.20
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• pp.293-304
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• 1997

The Wiener Werkstatte created the most avangarde textile designs in Europe at the end of the 19th and the beginning of the 20th century. This study is to examine the distinctive characteristics of the textile design of the Wiener Werkstatte. The purpose of this study is to analyze the textile designs of the various designers who had contributed to shape the characteristics of the Wiener Werkstatte at various stages, and to catagorize the designs according to the subject matter, the design sources, the layout, the design principles, and the usages. The textiles of the first half of the Wiener Werkstatte are wovens for the homefurnishings. They were used as upolsteries. Wall coverings, and curtains in the commissioned buildings and houses which Hoffman designed and built in conjunction with the Wiener Werkstatte. The designs of this period have the simple and bold characteristics using less then three colors in a design. The subject matters used in the designs are firstly, stylized animals and plant forms; secondly, the purely geometric forms derived from the architural buildings. The textiles of the latter half of the Wiener Werkstatte put more emphasis on the printed textiles for the women's apparels. The textile designs of this period are categorized into four groups : firstly, the designs that stylized plant forms ; secondly, reinterpretational designs; thirdly, ethnic designs : and fourthly, the geometric art deco designs. The number of colors used in a design range up to 7 colors and all over, stripe, and ogee layouts are used.

• Proceedings of the KIPE Conference
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• 2013.07a
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• pp.16-17
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• 2013

본 논문은 3상 단방향 전력 변환기인 비엔나 정류기의 입력 전압 센서가 없는 제어 알고리듬 적용 연구에 대하여 기술 한다. 3상 시스템을 제어하기 위해서는 입력 전압과 입력 전류 DC Link 전압을 계측을 하여야 한다. 특히 입력 전압을 계측 시 시스템의 체적이 증가하고 가격이 올라 갈 수 있다는 단점이 있다. 본 논문에서는 입력 전압 센서가 없는 비엔나 정류기 제어 알고리듬을 이용하여 입력 전압 추종 및 역률 보정을 구현 하였다. 모의 해석은 MATLAB/SIMULINK를 사용하여 검증 하였다.