• 대한전기학회논문지
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• 제38권7호
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• pp.524-538
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• 1989

최근에 들어 마이크로 컴퓨터를 비롯하여 사무 자동화 및 가정 자동화와 관련한 전자기기에 쓰이는 1KVA이하의 소용량 UPS의 수요가 급격히 증가하고 있다. 이와같은 UPS의 응용에서는 UPS의 소형화와 가격 절감이 가장 요구된다. 본 논문에서는 새로운 방식의 직렬 공진형 인버어터와 그의 제어 방법을 제안하였다. 제안한 인버어터는 영전류 스윗칭 방식의 공진형 컨버어터와 고주파 절연 변압기 및 영전류 스윗칭 방식의 싸이클로 콘버어터로 구성되었다. 공진 전류의 평균 크기를 정현적으로 변화시키고 싸이클로 콘버어터를 이용하여 저주파 출력 전압을 발생시킨다. 제안한 인버어터에서는 양방향 전력 전달이 가능하고 절연 변압기의 크기를 대폭 줄이고 가격도 줄일 수 있다. 제안한 제어방법을 simulation과 실험을 통하여 확인하였다.

• 대한안전경영과학회지
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• 제15권1호
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• pp.161-167
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• 2013

The purpose of this study was to assess power loss in the computer and office automation equipment and identified a way to save power consumptions through field measurement. In this study, the meaning of standby power was to consume power while waiting for the use of any electronic equipment. This standby consumption was about 11% of total power consumption even though we did not seriously realize it. Therefore, it was very important to measure accurate power consumption at the standby status of electronic equipment. In addition, it also helped to reduce potential risks of electricity associated disasters. This study proposed the way to reduce power losses through automatic turn off switches for power outlets and switches. Finally, this study can evaluate power consumption patterns that can reduce power consumptions and potential risks of power related disasters. This also can achieve the goals of sustainability that can reduce environmental impacts by lowering energy consumptions and greenhouse gas emissions.

• The Journal of the Acoustical Society of Korea
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• 제14권2E호
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• pp.33-36
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• 1995

CELP 보코더에서의 피치검색에 있어서, 음성신호의 상관함수의 몇가지 특성을 이용한 스킵기법은 음질의 저하를 거의 일으키지 않으면서 피치검색에 필요한 계산량을 줄여준다. 하지만, 때때로 양의 상관값을 갖는 검색대상피치들이 검색에서 제외되어 음질이 저하되는 것을 완전히 막을 수는 없다. 이러한 단점을 보완하기 위해서 약식의 상관함수식을 이용한 개선된 스킵기법을 제안한다. 제안된 방법을 기존의 전체검색방법보다 계산량을 35% 이상 줄이면서도 음절이 저하는 일어나지 않는다.

• 대한안전경영과학회지
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• 제10권4호
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• pp.47-56
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• 2008

This study suggest a way to improve duty process of KTX(Korea Train Express) high-speed train driver. A new operating system which based on safety was introduced to operate high-speed train which travel above 300km/h on the high-speed railroad but below 200km/h on the general railroad. There were some studies on the operation of high-speed train which travel on the high-speed railroad and on the general railroad with safety. However they overlooked the elements of human errors. The duty-load of KTX train driver's 14 basic operation processes was measured using NASA-TLX and found four processes with high duty-load. In this paper, critical tasks of the high duty-load processes are determined using a questionnaire. Some suggestions which include the improvement of facilities, operating system and operating skill are proposed to lighten duty-load of the critical tasks. The validity of the proposed new task processes is demonstrated by making question to KTX train driver. To use this results cost-benefit analysis, hazards analysis etc. should be performed additionally.

• 한국철도학회:학술대회논문집
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• 한국철도학회 1998년도 창립기념 춘계학술대회 논문집
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• pp.172-183
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• 1998

The purpose of this study is to reduce the number of employees hired by Seoul Metropolitan Subway Corporation(SMSC) as a way of responding to deteriorating financial deficit problem. For the reduction, the personnel structure of Seoul Metro Rapid Transit Subway(SMRTS) newly founded in 1995 is benchmarked. Several assumptions are set for seeking the persuasive alternative; 1) no compulsory reduction of existing personnel, 2) raising the salary of SMSC to the same level of SMRTS for compensating intensified work burden, 3) hiring new employees to the amount of one-third of the reduced workforce for minimizing the problems associated with the reduction. The study suggests that the personnel reduction in relevant parts be planned in the following ways; 1) passenger transport part: from daily 3 shifts of 4 group to 2 shifts of 3 group, 2) fleet inspection, civil d: electric engineering, railtrack maintenance, signal parts: from 12 day-off to 10day-off, 3) architecture, AFC parts: from 2 shifts of 3 group to daily work, 4) fleet maintenance, architecture parts: expanding out-sourcing ＆ automation, and 5) headquarter part: 10% reduction of the total of office workers. The study finds, by implementing the plan, that 1,270 employee can be reduced, and that aggregate 106.8 billion won will be saved for the next 10 years.

• 한국주거학회논문집
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• 제18권5호
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• pp.33-43
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• 2007

This study aimed to analyze residential demands on intelligent systems for apartments and suggest space design directions of intelligent apartment complexes. Data collection was done through mail-in surveys by five respondent groups. Outcomes of this study would provide basic data for developing intelligent apartment housing corresponding to the residential characteristics and demands of the five respondent groups. The sample size for the questionnaire survey was 592. The types of the target residents in this study were classified into five categories; nuclear families, dual income families, single households and the handicapped needing special environmental supports, and workers at home who need the new home design with a home office. The primary findings of this study were as follows. 1) For the controllers of intelligent system, nuclear families preferred TV, single households prefer home-pad which is movable and provides access to the internet. Dual income families, the handicapped and workers at home preferred remote control panels. 2) For the desirable space for computer equipment, regardless of the types of target residents, bedroom and living room were preferred. 3) For the desirable space for a home theater system, most of respondent groups preferred living rooms, but many rather wanted to have media rooms only for this system.

• 산업경영시스템학회지
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• 제31권4호
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• pp.77-85
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• 2008

생물학적인 셀 인젝션 기술은 유전자 주입, 시험관 배양, 인공수정 및 신약개발 분야에서 광범위하게 사용되어 오고 있는 기술이다. 생물공학에서 다루는 셀 인젝션 기술은 크게 착생세포 인젝션과 서스펜디드 셀 인젝션으로 구분할 수 있다. 최근 상용화 장비로 출시되고 있는 것들은 착생세포에 대한 자동 인젝션 시스템이 대부분을 차지하고 있다. 반면, 서스펜디드 셀 인젝션 시스템의 경우는 비교적 최근들어 자동화 장비 및 방법론의 개발에 대한 논의가 이루어지고 있는 실정으로 실제 수많은 연구자들의 노력에 힘입어 서스펜디드 셀을 대상으로 한 통합 자동화 셀 인젝션 시스템의 개발이 가속화되고 있기는 하지만 이에 대한 만족할 만한 성과는 아직 이루어 지지 않고 있는 실정이다. 본 논문은 서스펜디드 셀을 대상으로 한 인젝션 시스템 개발에 관한 것으로 특히 셀 홀딩 시스템과 최적의 인젝션 피펫 궤적을 결정하기 위한 시스템 개발에 관한 것이다. 본 논문에서 다루어지는 서스펜디드 셀은 통합 자동화를 위하여 특별히 고안된 셀홀딩 시스템에 의하여 배열의 형태로 고정되며, 셀 인젝션 시스템은 엠브리오와 인젝션 피켓을 이미지 프로세싱 기술에 의하여 인식하고 피펫의 인젝션 궤적을 결정하는 것을 포함하고 있다.

• 한국주거학회:학술대회논문집
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• 한국주거학회 2005년도 추계학술대회 논문집
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• pp.185-188
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• 2005

With the development of digital technology and the advent of the concept of well-being, kitchen will be worked as the center of housing and turn into multi-functional space. So a research is requested to consider the users' needs for kitchen based on their life characteristics. The purpose of this study is to find out housing lifestyles, and to search and analyze users' needs for kitchen planning according to their lifestyles. And then plans for kitchen design are suggested. The findings are as follows. (1) Housing lifestyles of users living in apartment are categorized into the type of network and trial & development, pursing the new environment and technology, the type of high quality and convenience, seeking the way to make housework easy and comfortable, the type of housework oriented and the type of unspecification. (2) The type of network and trial & development requests home automation, confrontation layout of counter-top, the type of high quality and convenience requests enlargement of kitchen space, the newest appliance and kitchen island, the type of housework oriented requests the efficiency of space utilization with a counter-top style table, and the type of unspecification asks space for study and office work. All of the types have needs for water use space, larger storing space and a Kimchi refrigerator.

• 한국정보처리학회논문지
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• 제4권8호
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• pp.2060-2069
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• 1997

컴퓨터를 이용한 정보처리가 일반화되고 컴퓨터 통신망을 통한 문서양식의 통폐합 및 간소화는 되었지만 문서의 결제는 여전히 수작업으로 이루어지고, 컴퓨터의 역기능이 급증하면서 문서에 대한 보안 사항들의 부정 유출도 심해서 기업의 기밀이 타기업으로 넘어가 커다란 타격을 받는 경우가 발생하여 이를 개선하는 방안으로 문서를 효율적으로 이용하고 중요한 문서에 대한 보안유지와 문서결재의 신속성을 추구하며 보관된 문서는 변형된 Vernam의 암호화 기법을 이용하여 클라이언트/서버간에 기능을 분담할 수 있는 전자결제 시스템을 설계 및 구현한다.

• 정보기술과데이타베이스저널
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• 제1권1호
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• pp.31-62
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• 1994

Information systems for application areas like office automation, customer service or computer aided manufacturing are usually highly interactive and deal with complex document structures composed of multiple media formats. For the realization of these systems, nonstandard database systems, which we call document databases, need to handle different types of coarse-and fine-grained document objects(like full-text documents, graphics and images), hierarchical and non-hierarchical relationships between objects(like composition-links and cross-references using hypertext structures) and document attributes of different types such as formatting/presentation information and access control. In this paper, we present the underlying data model for document databases based on descriptive markup languages that provide mechanisms for specifying the logical structure(or schema) of individual documents stored in the database. We then describe extensions to the data model for supporting notion of composite structures("join" operators for documents) --composition and hyperlinking mechanisms for representing compound documents and inter-linked documents as unique entites separate from their components. Furthermore, due to the interactive nature of the application domains, the database system in conjunction with clients(or browsers) has to support visual navigation and graphical query mechanisms. We describe the functionality of a new user interface paradigm called HyBrow for meeting the above mentioned requirements. The underlying implementation strategy is also discussed.discussed.