• 한국산학기술학회논문지
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• 제13권5호
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• pp.2015-2022
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• 2012

본 논문은 항공전자장비의 구조해석을 통한 하우징과 인쇄회로기판의 해석과 설계에 관한 것으로 대기자료 컴퓨터 개발 사례를 통한 연구결과이다. 항공기에 장착되는 전자장비는 전기적인 특성 외에도 운용환경에 따른 구조 설계가 매우 중요하고 설계 단계에서부터 해석을 통한 입증이 되어야 한다. 본 연구에서는 장착되는 항공 장비의 응력과 진동 요구도를 분석하여 해석 결과를 통하여 설계에 적용하고 요구도에 대해서 입증하는 방법에 대한 것이다. 구조 해석은 상용 소프트웨어를 사용하였으며 하우징의 내부 리브 설계에 대한 적합성을 확인하고 인쇄회로 기판의 변위를 계산하여 전자 부품 배치에 활용하는 방법에 대해서 제시하였다.

• 한국군사과학기술학회지
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• 제3권2호
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• pp.166-178
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• 2000

As the 21st century signifies an information-oriented society, the computer integration takes place in all walks of human presence. Needs for computer and network-integrated automation present new challenges in military as well as commercial facility systems engineering. Since the first intelligent building appeared in USA in 1984, it gradually became an essential capability for the building industry requirement these days. Intelligent Building System(IBS) is evolving to be very complex because there are many subsystems such as telecommunication(TC), office automation(OA), building automation(BA), security, construction environments, etc. During the planing phase of IBS development, therefore, a disciplined systems engineering must be performed to analyze stake- holder's requirements to build an optimized system while minimizing trial-and-error expenses and risks. This paper presents a conceptual design of BAS applying systems engineering methods. The contribution of this study includes the development of IBS subsystem specification for building automation subsystem, which is a part of IBS, using the methodology of requirement analysis, functional analysis, synthesis, and verification. A computer-aided systems engineering s/w, RDD-100, was used to improve the system design efficiency and to promote the product design knowledge management for reuse in later design programs.

• 한국안전학회지
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• 제22권1호
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• pp.7-12
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• 2007

There are two kinds of design process for sprinkler system. one is pipe schedule system and the other is hydraulically designed system. We have inefficient results when we design by hydraulically designed system because the design process for sprinkler system is restricted by domestic fire code. Therefore, it is essential to do an introduction of hydraulically designed system which is based on engineering for enhancing reliability and efficiency of sprinkler system. This study presents points at issue by comparing and studying design standards of sprinkler system from Korea, Japan and NFPA, and presents improvement plans of national fire safety code of sprinkler system by processing, comparing and analyzing designs according to piping schedule and hydraulically designed system about domestic objects. Installation standards of sprinkler system have to be applied not by object buildings but by hazard classification. It is hard to design an efficient sprinkler system for fire control when water supply requirement of sprinkler systems allocated according to a size of a building because the same purpose but other buildings may request more water requirement or less. We should sublate the pipe schedule system from national fire safety code and need to introduce the hydraulically designed system. The pipe schedule system presents easy access because it is based on the forecasted engineering calculations but it is applied to only small buildings like NFPA due to its low reliability.

• 한국항행학회논문지
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• 제6권4호
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• pp.296-305
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• 2002

본 논문에서는 IEEE Std 802.11b와 IEEE Std 802.11a의 규격집으로부터 RF 송수신 시스템의 설계를 위한 최소성능 요구 조건의 파라메터들을 제시하였으며, 이 파라메터들로부터 RF 송수신 시스템의 설계 과정에서 요구되어지는 최소성능 요구조건을 산출하였다. 그 산출된 값으로부터 RF 송수신 시스템을 구성하기 위한 최적의 조건을 갖는 부품을 선정하여 Agilent ADS로 시뮬레이션을 했다. 이러한 분석결과와 시뮬레이션 결과는 실제 무선 LAN 설계시 유용하게 사용될 수 있을 것이다.

• 시스템엔지니어링학술지
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• 제6권2호
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• pp.29-35
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• 2010

In general, an Architecture of a system is embodied as applied results of a requirement analysis of a system in early development phase. These efforts play a important role in analyzing and understanding a system considering operational, functional, and physical view and deriving a correct solution before developing the system. In this paper, the architecture of the Tube Transportation System(TTS) known as the new transportation system in Railway Domain is depicted by performance parameter has already developed. The existing performance parameters are shown by a variety of types with many meanings rather than types of general requirements refined. As these early performance parameters have analyzed and complemented to a level of requirement by requirement managers and other domain specialists, the architecture of the Tube Transportation System was developed systematically and then system requirements will be drawn up definitely. The presented architecture will provide a framework of developing a TTS and also offer an information in performance analysis of TTS.

• 시스템엔지니어링학술지
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• 제13권1호
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• pp.51-56
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• 2017

This paper presents a requirement development process using the model based systems engineering design process to the developments of the missile Seeker. SysML Model and requirement analysis templates were used as the specific execution method for applying the system engineering process. This paper will present a process for deriving the technical requirements and derived requirements using them.

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 2001년도 추계 학술발표회 논문집 Proceedings of EESK Conference-Fall 2001
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• pp.423-430
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• 2001

This research was conducted to investigate the seismic behavior and ductility of circular spiral reinforcement concrete bridge columns used in high strength concrete. The experimental variables consisted of transverse steel amount and spacing, different axial load levels. From the test results, sufficient displacement ductility(at least 5.5) was observed for the columus which was satisfied wi th the requirement confinement steel amount of the Korean Bridge Design Specification. In case of the columns with 50 MPa of concrete compressive strength, the columns wi th 80 % of the confinement steel amount requirement showed adequate displacement ductility(at least 6.5) under 0.2 of axial load level. And in case of the columns with 60.2 77a of concrete compressive strength, the columns with 44 \ulcorner of the confinement steel requirement provided adequate displacement ductilit under less than 0.1 of axial load level and the columns with 0.22 % provided showed comparatively high the ducti1iffy under 0.21 of axial load level.

• 한국농공학회지
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• 제27권1호
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• pp.71-76
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• 1985

The objectives of this field experiment was to determine and recommend the water requirement for harrow considering the factors of soil class and soil moisture status. Experiment was conducted at the -paddy field of the Office of Rural Development in Chungnam Province. The results of experiment were summarized as follows: 1. Continuous drought day of 10-yr return period in transplanting season was about 25 days and the water content ratios at that point were approximately 20% in clayey-loam soil and 12% in sandy-loam soil irrelevantly to the soil-depth. 2. It was recommended that harrow-water requirement for standard design were approximately 9Omm in clayey-loam soil, 110mm in loamy soil and l3Omm in sandy-loam soil.

• Journal of Ship and Ocean Technology
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• 제12권1호
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• pp.45-56
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• 2008

Recently, International Association Classification Societies (IACS) has adopted the Common Structural Rules (CSR) for Bulk Carriers and Tankers, which specifies the requirement associated with the ultimate strength of hull girder structure. The theoretical background and the results of verification study are neither well summarized nor released. Furthermore, the requirement is not a form of deterministic formula but a form of program in which source code is not disclosed. The reliability of the non-linear structural analysis program is verified through the comparison with the results of the analysis and the model test. Then, the reliability of the ultimate strength requirement in CSR is checked by comparing with the results of rigorous non-linear analysis.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2006년도 춘계종합학술대회
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• pp.569-572
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• 2006

본 논문에서는 RSS 포맷으로 제공되는 문서를 사용자가 수집하고 구독할 수 있는 RSS 리더기를 설계하기 위한 요구사항 추출과 기록을 위한 분석 모델을 제시하고자 한다. 분석모델로서는 유스 케이스 모델을 채택하여 요구사항 분석과 문서화를 수행하며, 요구사항의 분석의 수단으로서는 책임주도 설계방식에 기초한다. 특정한 리더기를 전제하지 않은 분석 모델은 비즈니스 모델로 이용될 수 있다.