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파장 가변 협대역 투과 필터를 이용한 광섬유 격자 동적 센서 시스템
구현덕,이상배,최상삼,송석호,김필수,조남소,김남식 한국광학회 2001 한국광학회지 Vol.12 No.2
광섬유 브래그 격자는 코어의 굴절률이 주기적으로 변하는 특성으로 인하여 브래그 조건을 만족하는 파장은 반사시키고 다른 파장은 통과시키는 소자이다. 본 논문에서는 광섬유 격자를 이용한 동적 스트레인 센서시스템을 구현하였다. 4-채널 동적 센서 시스템에 사용된 필터의 선형성을 보상하여 필터의 전 구간에서 동적 신호를 측정하였으며 실시간 동적 신호의 측정을 위하여 LabView를 이용한 신호처리 및 인터페이스를 하였다. 이러한 센서시스템의 분해능은 $5\mu$strain이며 동적 스트레인 측정 범위는 필터의 전 구간 약 $1200\mu$strain에 해당한다. 센서시스템을 이용하여 외팔보(steel-bar)의 4지점에서의 스트레인의 변화량을 측정하였으며 콘크리트 시험 보에 적용하여 하중 인가시 시험보가 받는 스트레인의 변화량을 실시간 측정하였다. We present a fiber Bragg grating (FBG) sensor system for measuring static and high-speed dynamic strains with a resolution of about $5\mu$strain. This sensor system demodulates signals from the FBG sensor utilizing a compensated tunable narrow bandpass filter. We have placed a set of twelve FBGs to concrete specimen and measured its internal stress under various applied load conditions.itions.
TFM 방식을 이용한 건물의 동적 열성능해석 기법 연구(Ⅰ)
구현덕,이순화,이진숙,송인춘 忠南大學校 産業技術硏究所 1993 산업기술연구논문집 Vol.8 No.1
This study presents the methodology application of hour-by-hour computation for an extensive analysis in building. The approach to equipment selection based on air-conditioning equipment and air distribution systems with sufficient capacity to cope with maximum design load evolved when all design calculations were performed manually. At that time, extensive design analysis was impractical: now, computers, used frequently for rountine design calculations, make anaysis practical. Consequently, this study describes the fundamental methodology used in calculating a space load and gives basic equations for determining hour-by-hour load factors given in tabular forms in the ASHRAE FUNDAMENTALS, 1985 and 1989. It is possible to construct computerized routines to duplicate results obtained with the tabular data, and to examine the effect of various systems and operating schedules on the space energy analysis. This study deals with fundamental calculation procedures for 1. Heat gain through exterior walls and roofs using transfer function coefficients. 2. Hrat gain through interior patitions, ceilings and floors using transfer function coefficients. 3. Conversion of all heat gain components into appropriate room/space loads. 4. Extention of the procedures to calculate the space air temperature and heat extraction rate obtained with a particular type and size of terminal unit. By applicating this procedures to computerization, three basical calcualtion routines are made and verified as the proper simulation methodology. As results. 1. Houry conduction rate has only 0.48% err in average. 2. Houry radiation rate has only 0.041% err in average. 3. Houry temperature variation has only 0.001% err in average. 4. Houry predicted heat extration rate has only 0.005% err in average. From the above results, it is possible to use TFM computerization methodology for energy analysis in building. By applicating three basical comuper calculations, more complicate computer simulation can be interpreted to be needed for annual energy analysis.
구현덕,송인춘 忠南大學校 産業技術硏究所 1996 산업기술연구논문집 Vol.11 No.1
The proposed building site may be shadowed by neighbouring objects like tall building and tree etc. With the help of solr path diagram it is possible to determine the time period during which a particular building or any other object will shade the site. Eventually by computer application an easy and fast assessement has been achieved and extended to the realms of window, roof overhang, shading element, building block, etc. The study presents a proper assessment model in which it is available to plot the all coordinate of shade, site, and azimuth all together by overlapping on the screen and to predict how long the shade will cast over the object and how well window is designed as well as overhang and building block.