• 제목/요약/키워드: Design fire

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도로터널 화재 시 집중배기방식의 배기포트 통과풍속이 배연성능에 미치는 영향에 관한 연구 (A study on the effect of air velocity through a damper on smoke extraction performance in case of fire in road tunnels)

  • 류지오;나광훈
    • 한국터널지하공간학회 논문집
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    • 제22권4호
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    • pp.347-365
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    • 2020
  • 도시지역의 교통난 해소와 녹지공간의 확보를 위해 도심지 터널이 증가하면서 차량의 정체 가능성이 높은 터널에 대한 제·배연방식으로 대배기구에 의한 집중배기방식의 적용이 증가하는 추세에 있다. 집중배기방식의 배연성능은 배연풍량 뿐만 아니라 배기구(댐퍼)의 형상이나 배기풍속 등 다양한 인자에 의해서 영향을 받는 것으로 알려져 있다. 이에 본 연구에서는 각국의 배연시스템 설계기준 및 설치현황을 알아보고 배연풍량이 동일한 경우에 배연댐퍼 사이즈에 따른 배연성능을 연기 이동거리 측면에서 수치시뮬레이션을 수행하여 비교·평가하였으며, 다음과 같은 결과를 얻었다. 배연댐퍼의 단면적이 증가할수록 배기팬에 근접한 댐퍼에서 배기풍량이 집중되어 화재 하류의 댐퍼의 배연풍량이 감소하여 하류측의 연기 이동거리가 증가하는 현상이 발생한다. 이와 같은 현상을 방지하기 위해서는 배연댐퍼의 단면적을 작게하여 통과풍속을 높게 함으로써 댐퍼통과 시 압력손실이 증가하도록 하여 배기구간에서 배연풍량의 불균일성을 완화할 필요가 있다. 본 해석범위에서는 배연댐퍼의 설치간격이 50 m인 경우에는 설계통과풍속이 4.4 m/s (댐퍼면적: 2.34 ㎡ = 1.25 × 1.85 m) 이상, 댐퍼의 설치간격이 100 m인 경우에는 설계통과풍속이 4.84 m/s (댐퍼면적: 3.38 ㎡ = 1.5 × 2.25 m) 이상일 때 배연성능확보에 유리한 것으로 나타났다.

현대회화에서 드러난 해체의 형식론에 관한 연구 -타의적 해체와 자의적 해체의 성격규정을 중심으로- (A study of the destructive styles from Contemporary Paintings - Focused on distinguishing enmity-destruction and self-destruction -)

  • 박기웅
    • 조형예술학연구
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    • 제7권
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    • pp.5-63
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    • 2005
  • Generally, the meanings of destruction are related in the meaning of demolition, breakdown, into fragments ... and so on, and the similar meanings are twist, crush, demolish, split, cut, into pieces , break up ... etc. Further, it has related in the cruelty and destructive heart which are linked with orgy, Sadism, Necrophilia and so on. The meanings are also expressed by the initial , which are deprivation, deface, defame, deform, degrade, delegitimize, denounce , deride, destroy, devalue, as well as debase, debunk, declaim, declassify, decry, delete, denigrate, deprecate, despise or detract ...and so on. Dario Gamboni has discussed the meaning in his book as two categories Iconoclasm and Vandalism. And the similar meanings could be found in the words which has the initial of , like abase, abate, abhor, abjure, abolish, abridge, abuse ...and so on. Even though the distinct meanings of Iconoclasm and Vandalism, it is not easy to distinguish clearly between the differences when the results are accomplished in contemporary paintings because of the similarity of the results. In korean vocabulary there are no similar words to distinguish between the meanings of destruction and deconstruction, and the deconstruction is not recorded in the general dictionaries. However the meaning of is diminishing, separation, contrast and so on. So the unification of the word as do-construction is not construct, minus construction, reverse construction. And Vincent Ditch explained that there are the meaning of destroy the text. From Jacques Derrida, the deconstruction strategy is to criticise the world of traditional metaphysics and logocentrism, and not to reconstruire the philosophical meaning of texts but $d\'{e}construire$ them. And Saussure emphasized that the signifers could have more meaning that there can be more signified in traditional texts in the art. as a result, deconstruction is explained that there are many signified meanings in a signifer. In this thesis , from using the meanings of destruction and deconstruction, to distinguish the expressive skills in contemporary art works are arising. Therefore, special methods which are linked in the destruction styles are selected. As a result, the two different purposes of destruction is arising, one is enmity destruction and the other is self destruction another word, auto destruction or destruction to create The enmity destruction can be distinguished by the two category Iconoclasm and Vandalism. They come from the moment of different historical aspect is arising and want to attack the Icon or masterpiece this concept is from the study of John Philips and especially iconoclasm is linked with religious and artistic heart, but Vandalism is come from the political attack. Sometime, this distinguish is not clearly arising, because the two aspects are co-related in the attack. As a result, firstly, the Iconoclastic controversy had arisen in the methods of Dadaism which has developed by Man Ray, Francis Picabia and Marcel Duchamp. They want to attack the pre-established master-pieces and painting spaces, and they had 'non-artistic attitude' not to be art. Since 1980, the German artist Anselm Kiefer adapted the methods and made them his special skills so he had tried to paint tough brush strokes and draw with hugh pallette image line and fire and water images , they can be the image attack as the Iconoclasm. secondly, the model of vandalism is to be done by hammer, drill, canon and so on. the method is to attack the content of painting. Further, the object of destruction is bound by cords and iron lings to demolish or to declare the authority of pre-statues; it symbolize the pre-authority is gone already. Self-destruction based paintings are clearly different in the purpose of approaching the art work. First of all, they can be auto-destruction, creative destruction and metamorphosis destruction, which is linked with the skill the material aspect and basic stature, and sign destruction or signifier destruction, which is link with the inner meaning destruction that is considered as the Semiotical destruction in post-modern paintings. Since 1960, the auto destruction is based on the method of firing, melting, grinding and similar skills, which is linked with Neo-Dada and reverse-assemblage. Metamorphosis destruction is strongly linked with the basic inner heart price and quality, so it can be resulted in the changedness of expectation and recognition. Tony Cragg has developed the skills to metamorphose the wood as stone or iron as cloth and stone as sponge and rubber and so on. The researcher has developed the same style in the series of since 2003. The other self-destructive methods are found in the skill of sign destruction. In the methods the meaning of the art is not fixed as one or two, but is developed multi-meaning and differ from original starting situation, so Jacques Derrida called the difference meaning in deconstruction. It is the destruction of textes. These methods are accomplished by David Salle, Francesco Clemente, and recently Tracy Emin, who has developed the attacking heart in the spectators' emotion. Sometime in the method of self-destruction, it is based on horror and shock, the method is explored by Demian Hirst and Jakes and Dinos Chapman. Their destructive styles stimulate ambivalent heart and destroy original sign of girl and animals.

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Wearable Computers

  • Cho, Gil-Soo;Barfield, Woodrow;Baird, Kevin
    • 섬유기술과 산업
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    • 제2권4호
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    • pp.490-508
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    • 1998
  • One of the latest fields of research in the area of output devices is tactual display devices [13,31]. These tactual or haptic devices allow the user to receive haptic feedback output from a variety of sources. This allows the user to actually feel virtual objects and manipulate them by touch. This is an emerging technology and will be instrumental in enhancing the realism of wearable augmented environments for certain applications. Tactual displays have previously been used for scientific visualization in virtual environments by chemists and engineers to improve perception and understanding of force fields and of world models populated with the impenetrable. In addition to tactual displays, the use of wearable audio displays that allow sound to be spatialized are being developed. With wearable computers, designers will soon be able to pair spatialized sound to virtual representations of objects when appropriate to make the wearable computer experience even more realistic to the user. Furthermore, as the number and complexity of wearable computing applications continues to grow, there will be increasing needs for systems that are faster, lighter, and have higher resolution displays. Better networking technology will also need to be developed to allow all users of wearable computers to have high bandwidth connections for real time information gathering and collaboration. In addition to the technology advances that make users need to wear computers in everyday life, there is also the desire to have users want to wear their computers. In order to do this, wearable computing needs to be unobtrusive and socially acceptable. By making wearables smaller and lighter, or actually embedding them in clothing, users can conceal them easily and wear them comfortably. The military is currently working on the development of the Personal Information Carrier (PIC) or digital dog tag. The PIC is a small electronic storage device containing medical information about the wearer. While old military dog tags contained only 5 lines of information, the digital tags may contain volumes of multi-media information including medical history, X-rays, and cardiograms. Using hand held devices in the field, medics would be able to call this information up in real time for better treatment. A fully functional transmittable device is still years off, but this technology once developed in the military, could be adapted tp civilian users and provide ant information, medical or otherwise, in a portable, not obstructive, and fashionable way. Another future device that could increase safety and well being of its users is the nose on-a-chip developed by the Oak Ridge National Lab in Tennessee. This tiny digital silicon chip about the size of a dime, is capable of 'smelling' natural gas leaks in stoves, heaters, and other appliances. It can also detect dangerous levels of carbon monoxide. This device can also be configured to notify the fire department when a leak is detected. This nose chip should be commercially available within 2 years, and is inexpensive, requires low power, and is very sensitive. Along with gas detection capabilities, this device may someday also be configured to detect smoke and other harmful gases. By embedding this chip into workers uniforms, name tags, etc., this could be a lifesaving computational accessory. In addition to the future safety technology soon to be available as accessories are devices that are for entertainment and security. The LCI computer group is developing a Smartpen, that electronically verifies a user's signature. With the increase in credit card use and the rise in forgeries, is the need for commercial industries to constantly verify signatures. This Smartpen writes like a normal pen but uses sensors to detect the motion of the pen as the user signs their name to authenticate the signature. This computational accessory should be available in 1999, and would bring increased peace of mind to consumers and vendors alike. In the entertainment domain, Panasonic is creating the first portable hand-held DVD player. This device weight less than 3 pounds and has a screen about 6' across. The color LCD has the same 16:9 aspect ratio of a cinema screen and supports a high resolution of 280,000 pixels and stereo sound. The player can play standard DVD movies and has a hour battery life for mobile use. To summarize, in this paper we presented concepts related to the design and use of wearable computers with extensions to smart spaces. For some time, researchers in telerobotics have used computer graphics to enhance remote scenes. Recent advances in augmented reality displays make it possible to enhance the user's local environment with 'information'. As shown in this paper, there are many application areas for this technology such as medicine, manufacturing, training, and recreation. Wearable computers allow a much closer association of information with the user. By embedding sensors in the wearable to allow it to see what the user sees, hear what the user hears, sense the user's physical state, and analyze what the user is typing, an intelligent agent may be able to analyze what the user is doing and try to predict the resources he will need next or in the near future. Using this information, the agent may download files, reserve communications bandwidth, post reminders, or automatically send updates to colleagues to help facilitate the user's daily interactions. This intelligent wearable computer would be able to act as a personal assistant, who is always around, knows the user's personal preferences and tastes, and tries to streamline interactions with the rest of the world.

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공기조화, 냉동 분야의 최근 연구 동향: 2006년 학회지 논문에 대한 종합적 고찰 (Recent Progress in Air Conditioning and Refrigeration Research: A Review of Papers Published in the Korean Journal of Air-Conditioning and Refrigeration Engineering in 2006)

  • 한화택;신동신;최창호;이대영;김서영;권용일
    • 설비공학논문집
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    • 제20권6호
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    • pp.427-446
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    • 2008
  • A review on the papers published in the Korean Journal of Air-Conditioning and Refrigeration Engineering in 2006 has been accomplished. Focus has been put on current status of research in the aspect of heating, cooling, ventilation, sanitation and building environments. The conclusions are as follows. (1) The research trends of fluid engineering have been surveyed as groups of general fluid flow, fluid machinery and piping, etc. New research topics include micro heat exchanger and siphon cooling device using nano-fluid. Traditional CFD and flow visualization methods were still popular and widely used in research and development. Studies about diffusers and compressors were performed in fluid machinery. Characteristics of flow and heat transfer and piping optimization were studied in piping systems. (2) The papers on heat transfer have been categorized into heat transfer characteristics, heat exchangers, heat pipes, and two-phase heat transfer. The topics on heat transfer characteristics in general include thermal transport in a cryo-chamber, a LCD panel, a dryer, and heat generating electronics. Heat exchangers investigated include pin-tube type, plate type, ventilation air-to-air type, and heat transfer enhancing tubes. The research on a reversible loop heat pipe, the influence of NCG charging mass on heat transport capacity, and the chilling start-up characteristics in a heat pipe were reported. In two-phase heat transfer area, the studies on frost growth, ice slurry formation and liquid spray cooling were presented. The studies on the boiling of R-290 and the application of carbon nanotubes to enhance boiling were noticeable in this research area. (3) Many studies on refrigeration and air conditioning systems were presented on the practical issues of the performance and reliability enhancement. The air conditioning system with multi indoor units caught attention in several research works. The issues on the refrigerant charge and the control algorithm were treated. The systems with alternative refrigerants were also studied. Carbon dioxide, hydrocarbons and their mixtures were considered and the heat transfer correlations were proposed. (4) Due to high oil prices, energy consumption have been attentioned in mechanical building systems. Research works have been reviewed in this field by grouping into the research on heat and cold sources, air conditioning and cleaning research, ventilation and fire research including tunnel ventilation, and piping system research. The papers involve the promotion of efficient or effective use of energy, which helps to save energy and results in reduced environmental pollution and operating cost. (5) Studies on indoor air quality took a great portion in the field of building environments. Various other subjects such as indoor thermal comfort were also investigated through computer simulation, case study, and field experiment. Studies on energy include not only optimization study and economic analysis of building equipments but also usability of renewable energy in geothermal and solar systems.

구급대원의 전문심장소생술 시뮬레이션훈련이 직무수행융합능력에 미치는 영향 (The effects of out of hospital ACLS simulation training on the paramedic's duty ability)

  • 박유나;조병준;김경용
    • 한국융합학회논문지
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    • 제10권4호
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    • pp.99-106
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    • 2019
  • 본 연구는 시뮬레이션을 기반으로 한 전문심장소생술 교육이 병원 전 단계에 구급대원이 환자에게 시행하는 전문심장소생술 직무수행에 미치는 영향을 분석하고 효과적인 전문심장소생술을 시행하기 위한 기초자료를 제공하는데 그 목적이 있다. 비동등성 대조군 전후 설계를 기초하였으며 연구대상은 K소방학교의 신규 임용된 구급대원 16명이 참여하였다. 평가 도구로 사용된 시뮬레이션 교육 프로그램과 평가지는 ACLS 시뮬레이션 전문가 6인(응급의학 전문의 2명, 전공교수 2명, 전문강사 2명)에게 사전 검토 및 의견을 받아 본 연구에 적합한 도구로 개발하였다. 교육은 이론 30분, 실습 150분으로 구성하여 4인 1조 1개팀으로 구성하였다. 강사가 5분간 시연을 한 후 개인별 실습 후 디브리핑(debriefing)을 통한 교정을 거친 후 개별, 팀별 교육을 실시하였다. 평가척도는 5점 리커트(Likert) 척도로 수행능력 평가 점수를 부여하였다. 자료분석은 Windows용 SPSS 22.0 프로그램을 사용하였으며, 대상자의 일반적 특성은 빈도분석을 하였으며, 실험군과 대조군의 동질성 검증은 t검정을 하였고 두 그룹의 집단의 차이 분석은 대응표본 t 검정(paired t-test)으로 분석하였다. 동질성 검사에 실험군과 대조군의 동질성을 확인 할 수 있었다. 전문심장소생술(ACLS) 수행기술 6가지에 대한 평가에서 시뮬레이션 교육을 받은 실험군이 교육을 받지않은 전통적 교육 방식의 대조군보다 모든 면에서 수행능력이 우수하였음을 증명하였다. 수행기술은 1. 심전도 2. 전문기기 3. 수액처치 4. 리더십과 팀워크 5. 의료지도 6. 이송중 평가 이상 6가지 이다. 일반적인 강의와 실습을 한 구급대원보다 시뮬레이션 교육을 받은 구급대원이 직무수행 능력이 향상된 것이 검증되었다 따라서 종합술기 과정에 있는 학생이나 임상에 종사하는 응급구조사에게 시뮬레이션 훈련과 교육이 확대 적용된다면 더 능숙하게 직무를 수행해 나갈 수 있을 것이며, 심정지 환자에게 제공되는 구급서비스가 향상될 것으로 기대한다.

피렌체 르네상스와 메디치가 도서관 연구 (A Study on the Florence Renaissance and the Medici's Libraries)

  • 윤희윤
    • 한국도서관정보학회지
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    • 제53권3호
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    • pp.73-94
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    • 2022
  • 피렌체는 이탈리아 르네상스의 요람이다. 그것은 중세 인문주의자들의 고대 그리스·로마의 지식문화 탐구, 위대한 군주와 성직자의 문예적 소양과 리더십, 메디치 가문 등의 문화예술 후원, 예술가의 자유분방한 사유와 창의성, 시민의 비판적 의식과 문화적 욕구 등이 조합된 결과다. 그러나 메디치 가문이 고대 필사본과 중세 번역본을 수집하지 않았다면, 도서관을 건립하여 고전을 보존하고 제공하지 않았으면, 피렌체 르네상스는 개화할 수 없었다. 이러한 논거를 기반으로 본 연구는 피렌체 르네상스와 역사도서관을 개관한 다음에 메디치가의 고전자료 수집·구성을 분석하고, 메디치 도서관의 건축적 특징과 메타포를 추적하였다. 산 마르코 도서관(미켈로초 도서관), 바디아 피에졸라 도서관, 산 로렌츠 도서관(라우렌치아나 도서관)은 지진, 화재, 복원, 이관, 압수, 폐쇄 등 무수한 난관에도 불구하고 피렌체 르네상스의 마중물이자 산실이었다. 특히 코시모·로렌초의 재정 지원, 미켈로초 설계, 니콜리 개인장서를 기반으로 1444년 개관한 산 마르코 도서관은 르네상스 시대의 최초 공용도서관이었다. 그리고 줄리오 주도 하에 1571년 개관한 라우렌치아나 도서관의 건축적 백미는 '무지에서 지혜로'를 상징하는 미켈란젤로 계단이고, 내용적 진가는 인문주의자 니콜리와 메디치가가 수집한 고대 필사본과 초기 인쇄본이다. 요컨대 피렌체 르네상스를 논할 때 메디치가 장서와 역사도서관은 매우 중시해야 할 포인트다. 고전은 구시대 박제품이 아니라 통시적 기호학이며, 도서관은 인류 지식문화사를 조감하는 망원경이자 지식과 지혜를 창출하는 현미경이기 때문이다. 기록이 기억을 지배한다면 도서관은 기록을 집적한다. 따라서 비교적 역사가 오래된 국내 도서관의 소급장서 개발과 보존에도 긴 호흡과 타임캡슐 전략이 필요하다.