• 전력전자학회:학술대회논문집
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• 전력전자학회 2007년도 추계학술대회 논문집
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• pp.24-27
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• 2007

본 논문에서는 수 kW급 이상의 연료전지 응용을 위한 고효율 전압원 3상 DC-DC 컨버터를 제안한다. 제안한 컨버터는 전압원 컨버터임에도 작은 턴비를 가지며 입 출력 전류 리플이작다. 또한 클램프 회로의 동작으로 다이오드 서지전압 제거는 물론 저전압측 순환전류를 큰폭으로 감소시켜 스위치의 도통손실과 변압기의 동손을 최소화하였고 전 부하영역에서 하측스위치의 ZVZCS를 성취하여 스위칭 손실을 최소화 하였다. 또한 유효 듀티를 증가시켜 누설인덕턴스에 의한 듀티 손실을 보상하였다. 제안하는 컨버터의 동작원리를 설명하였고 기존 컨버터와의 비교분석을 수행하였으며 시뮬레이션을 통해 본 방식의 타당성을 검증하였다.

• 한국실내디자인학회논문집
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• 제19호
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• pp.121-127
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• 1999

The objective of this study was to criticize the model house of apartment and suggest a evaluation model which could be used as an effective tool. The evaluation model had been developed based on the theoretical framework suggested by previous results of research related on housing design, which comprised the following four components : 1) the paradigm of future home and life-style, 2) marketing effects of housing developer, 3) goals and principles of housing design and 4) results of user-preferences study, an evaluation model was suggested as a preliminary form which would be modified in detail after series of tests in the field. The evaluation model will be used to provide standardized criteria for the quality of model houses, and eventually help to improve the quality of apartment housing design by balanced information from theorist, user and developer.

• 한국실내디자인학회논문집
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• 제38호
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• pp.57-64
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• 2003

The purpose of this study is to examine house and interior design during the Georgian Period in England. The results of this study were as follows: 1. Typical houses during the Georgian Period were generally two types that one was a single detached house in the country and the other was a terrace houses in the city. 2. Both the houses and their interior design during the Georgian Period were influenced by Classicism and Palladianism. The distinction of forms and the decorations used motifs originating from Greece and Rome. Gradually, It had been changed by the influence of Rococo from Europe and the archaeological excavation of Pompeii and Herculaneum. 3. The facade of house used simpe, plain and symmetrical forms. Entrance was usually in the center of the house around sash windows. Also, the Inside of house, division of walls, arrangement of furnitures and decorations of details were followed the symmetrical forms. Finally, it was found that the distinctions represent the typical style of Georgian in England.

• 한국공작기계학회논문집
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• 제15권5호
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• pp.51-58
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• 2006

The old technique of sandblasting which has been used for paint of scale removing, deburring and glass decorating has recently been developed into a powder blasting technique for brittle materials, capable of producing micro structures larger than $100{\mu}m$. Recently, this technique is applied to fabrication of the glass cap for OELD packaging. But, micro crack is generated on the blasted glass, which cause to decrease fracture strength. In this paper, we investigated the effect of blasting parameters on surface characteristics, surface shape and fracture strength of the powder blasted glass surface.

• 한국실내디자인학회논문집
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• 제3호
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• pp.18-25
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• 1994

Interior design is an inerdisciplinary field that is in the early stages of theory development, it is necessary to build theoretical frame work for the research. The purpose of this study is to present interior design and guidelines in a three generation family apartment for the elderly, and to develop a theoretical framework on the basis of the human ecosystem approach for analysis of relations between elderly and environment. Analysis and investigations are done by literature review about residential environmental characteristics of the elderly based on the findings of the conceptual analysis. Environmenta elements of interor design related to elderly in a three generation family apartment are as follow ; First, Natural environmental element is orientation, site, temperature, local weather. Second, human behavioral element is privacy , interior design requirement based on physical and psychological effect, housing policy, behavior. Third, Human constructed environmental element is size of apartment space, interior design component, human dimension, aesthetic condition.

• 한국실내디자인학회논문집
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• 제13호
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• pp.50-59
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• 1997

The purpose of this study is to arrange the modification and the changes of modern fniture in Korea. The results of this study are as follows: 1) The style of traditional furniture was influenced by changes in class structure and social system, an increase in Honsu norms in terms of both quantity and quality, family, marrige, housing patterns, and behavioral patterns etc. 2) Modern furniture in Korea devided into two groups, one was traditiional group of innovative function and scale, the other was electing group of Japanase or Western style. 3) Due to the Honsu norms, Wedding furniture items became more various in kind. Jangrong has been an essential Wedding furniture items since moderv.

• 도서관문화
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• 제9권3호
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• pp.4-16
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• 1968

<이 글은 College & Research Libraries 지에 금년 1월호에 실린 Professionalism Reconsidered의 전역이다. 필자인 Dr. Mary Lee Bundy와 Dr. Mary Lee Bundy와 Dr. Paul Wasserman은 School of Library and Information Services, University of Maryland의 교수이다.> 본고에서는 전문직으로서의 사서직 문제를 사서가 갖게 되는 세 가지 기본적인 관계, 즉 고객과의 관계, 소속기관과의 관계 및 전문직단체와의 관계에 입각하여 검토해 보았다. 그래서 사서직이 갖는 성격 중에서 전문성을 인정할만하다고 생각되는 여러 요소를 이미 확립된 전문직들이 갖는 전ㅁ누성의 표준에다 견주어 보았다. 이 비교의 결가 사서직은 아직 전문직의 유형에 속하기에는 먼 거리를 유지하고 있음을 알 수 있었다. 사서직이 전문직으로 발전하려면 사서가 현재 행하고 있는 봉사의 성격과 사서를 얽어메고 있는 여러 가지 관료적인 관계에 대한 변화가 와야 한다. 본고에서는 도한 전문직단체와 도서관학교가 사서직의 전문화과정에 끼친 공헌도를 분석해 보았다. 이 분야의 발전도는 사서직이 참다운 전문직의 칭호를 마침내 얻을 수 있을 것이냐 그렇지 못할 것이냐의 관건이 된다.

• 한국주조공학회지
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• 제11권1호
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• pp.63-70
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• 1991

Aluminium alloy castings, which can be not only manufactured in larger geometrically complex shapes, but also show good mechanical properties in addition to light weight, have kept their potential use as structures in the field of automotives, industrial machines and aircrafts. The variations of eutectic Si size a great effect on the elongation, impact value, fracture toughness and fatigue crack propagation rate without changes in the tensile strength or yield strength. The cooling curves with the solidification rate between $1.4^{\circ}C\;/min$ and $19.1^{\circ}C\;/min$ were obtained. With the increase of solidification rate, DAS, eutectic Si size and grain size were all decreased, which enhanced the mechanical properties. The tensile strength and yield strength were the most greatly influenced by DAS, and the elongation and impact value by eutectic Si size.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2004년도 전력전자학술대회 논문집(1)
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• pp.283-288
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• 2004

In case while modulation index (M) is more than 0.7, the spectrum of motor voltage and current of a conventional two-phase SRP scheme are not reduced considerably. To solve the problems of a conventional two-phase SRP, this paper proposes a two-phase SRP(DZSRP) with double zero vector mode which zero vector is selected as V(111) in case of $M\;\geqq\;0.7$, and zero vector is selected as V(000) if M < 0.7. For the validity of the proposed method, a 16 bit micro-controller C167 was used and the experiments were conducted with the 1.5kw induction motor under load condition. And the experimental results show that the switching noise spectrum for all the M are spread to a wide band area.

• 도서관문화
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• 제9권8호
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• pp.21-22
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• 1968

전문직의 특징을 우리는 두가지로 말할 수 있다. 첫째 전문직이 수행하는 일의 성격이 관례적이며 일상적인 것이 아니고 지적인 판단력을 요하는 것이라는 점이다. 둘째 전문지그이 일은 그 목적이 개인의 금전적 이익에 있지 아니 하고 대사회봉사에 있다는 점이다. 바로 이 점이 전문직단체에서 윤리강령을 표방하게 되는 소이이다. 그래서 어떤 이들은 전문직의 특징을 말할 때 첫째 일의 성격이 지적이란 것과 둘째 직업윤리강령을 갖고 있다는 것을 들기도 한다. 지금 우리나라에서는 사서직이 전문직으로서 그 기반을 굳히려고 안간힘을 쓰는 중에 있다. 여러 가지 방면의 노력이 요구되겠지만, 외국의 선예에 따라 한국사서직의 윤리강령을 제정하는 일이 우리 앞에 놓인 한가지 중대한 과제가 아닐 수 없다. 우리가 이 작업을 시작할 때 참고가 될까싶어 미국의 사서직윤리강령을 번역ㆍ소개하는 바이다. 여기에 싣는 전문을 포함하여 28조목에 걸친 내용은 1938년 ALA에 의하여 채택된 이래 지금까지 통용되고 있는 것으로서 현재 미국에서는 본강령에 대한 개정안이 제시되어 관계인들에 의하여 검사중에 있음을 부기하여 둔다.