• 제목/요약/키워드: concept of the air

검색결과 700건 처리시간 0.024초

공동주택에 건강개념인 통기시스템에 관한 연구 - 공기순환과 필로티를 중심으로 - (A Study on the Air Ventilation System in Apartment Houses as a Health Concept - focused on the air ventilation and pilotis -)

  • 조철희;이특구
    • 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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    • 제10권1호
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    • pp.29-38
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    • 2004
  • The purpose of this study is to analyze the air ventilation system in apartment houses focused on the air circulation and pilotis. The air ventilation system is used with the data which were obtained by the environmental health, urban climate, air pollution, ventilation path. The architectural element was pilotis concept connected with piloti ratio, piloti position and piloti type. The summaries of this study were as follows; 1) the well-being apartment concept, 2) the heat island phenomenon, 3) the oxygen density of air, 4) the definition of ventilation path, 5) the pilotis connected with residential environment improvement. In addition, the detailded case study to the air ventilation system in apartment houses be needed.

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축소기초모델개념을 이용한 공기윤활 슬라이더 베어링의 최적설계 (An Optimization of Air-Lubricated Slider Bearings by Using Reduced Basis Concept)

  • 김동인;윤상준;강태식;정태건;최동훈
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2001년도 추계학술대회논문집 I
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    • pp.52-57
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    • 2001
  • In this paper, the optimum designs of air-bearing surface(ABS) are achieved effectively by using reduced basis concept which can reduce the number of design variables although the design space is distended. Generally, the optimization method is more effective than the trial and error. However, the efficiency of the former is largely dependent on the number of the design variables. In order to reduce the number of design variables and increase the efficiency, reduced basis concept is applied. We can define the desired design as a linear combination of basis designs using this concept. From this optimization method with reduced basis concept, we easily obtain the optimum designs of ABS whose target flying heights are 25, 20, 15 nm.

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Piaget의 구성주의 이론을 기초로 한 유아의 공기개념 발달에 관한 연구 (Young Children's Concept Development of the Air-Based on Piaget's Constructivism)

  • 채희준;이종희
    • 아동학회지
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    • 제25권4호
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    • pp.93-114
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    • 2004
  • The purposes of the present study were to identify the stages of early concept development of the air in young Korean children and to compare the stages with those reported by Piaget. The subjects were 87 four, five, and six-year-old children from one kindergarten, two day care centers, and an elementary school, all located in Seoul. To collect the children's ideas of the air, individual interviews were conducted based on Piaget's Clinical Interview method. According to the results, the children formulated very unique concepts of the air, showing artificialism, anthropocentric finalism, animism, and dualism. Their concepts of the air showed a consistent developmental process which is very similar to the stages proposed by Piaget. This implies that young children's misconcepts and idosyncratic ideas are very natural and can not be eliminate easily by artificial instruction. This also means that children's internal ideas themselves should be the starting point of education.

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소형항공기의 고밀도 운용방안 연구 (The Study on Small Aircraft Transportation System in Higher Volume Opreations)

  • 김현수;유병선;강자영
    • 한국항공운항학회지
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    • 제19권2호
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    • pp.37-44
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    • 2011
  • This paper summarizes the HVO concept and procedures, presents a summary of the research and results, and outlines areas where future HVO is required. This concept enables people to get their destinations through shortest paths with advanced air traffic control system and equipments. The concept's key feature is that pilots maintain their own separation from other aircraft using air-to-air datalink and on-board software which are needed for supporting flight information present on the high Way in the sky display and airborne internet. By assigning Self-Controlled Area which assume pilot have separation responsibility, controllers evaluated SATS HVO concept as a successful method on the view of reduced workload and increased traffic level on high volume operation.

Analysis of Contact Force in Eddy-current System Using the Virtual Air-Gap Concept

  • Park, Byung Su;Kim, Hwi Dae;Choi, Hong Soon;Park, Il Han
    • Journal of Electrical Engineering and Technology
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    • 제10권3호
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    • pp.1349-1355
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    • 2015
  • It is difficult to calculate the magnetic force of an object of magnetic material in contact with other objects using the existing methods, such as Maxwell stress tensor method, magnetic charge method, or magnetizing current method. These methods are applicable for force computation only when the object is surrounded by air. The virtual air-gap concept has been proposed for calculating the contact force. However, its application is limited to magneto-static system. In this paper, we present the virtual air-gap concept for contact surface force in the eddy-current system. Its validity and usefulness are shown by comparison between numerical and experimental examples.

AHP 기법을 이용한 무인기 자율기능 우선순위 도출: 유무인 협업 공대공 교전을 중심으로 (Deriving Priorities between Autonomous Functions of Unmanned Aircraft using AHP Analysis: Focused on MUM-T for Air to Air Combat)

  • 정병호;오지현;설현주;황성인
    • 산업경영시스템학회지
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    • 제45권1호
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    • pp.10-19
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    • 2022
  • Recently, the Defense Advanced Research Projects Agency(DARPA) in the United States is studying a new concept of war called Mosaic Warfare, and MUM-T(Manned-Unmanned Teaming) through the division of missions between expensive manned and inexpensive unmanned aircraft is at the center. This study began with the aim of deriving the priority of autonomous functions according to the role of unmanned aerial vehicles in the present and present collaboration that is emerging along with the concept of mosaic warfare. The autonomous function of unmanned aerial vehicles between the presence and absence collaboration may vary in priority depending on the tactical operation of unmanned aerial vehicles, such as air-to-air, air-to-ground, and surveillance and reconnaissance. In this paper, ACE (Air Combat Evaluation), Skyborg, and Longshot, which are recently studied by DARPA, derive the priority of autonomous functions according to air-to-air collaboration, and use AHP analysis. The results of this study are meaningful in that it is possible to recognize the priorities of autonomous functions necessary for unmanned aircraft in order to develop unmanned aerial vehicles according to the priority of autonomous functions and to construct a roadmap for technology implementation. Furthermore, it is believed that the mass production and utilization of unmanned air vehicles will increase if one unmanned air vehicle platform with only essential functions necessary for air-to-air, air-to-air, and surveillance is developed and autonomous functions are expanded in the form of modules according to the tactical operation concept.

축소기초모델개념을 이용한 공기윤활 슬라이더 베어링의 최적설계 (An Optimization of Air-Lubricated Slider Bearings Using the Reduced Basis Concept)

  • 윤상준;김동인;강태식;정태건;최동훈
    • 대한기계학회논문집A
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    • 제27권3호
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    • pp.343-348
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    • 2003
  • In this study, optimum designs of the air-bearing surface (ABS) are achieved using the reduced basis concept which can effectively reduce the number of design variables without cutting down on the design space. Even though the optimization method is easier and more applicable to handle than the trial-and-error method, its efficiency is largely dependent on the number of the design variables. Hence, the reduced basis concept is applied, by which the desired design can be defined as a linear combination of basis designs. The simulation results show the effectiveness of the proposed approach by obtaining the optimum solutions of the sliders whose target flying heights are 25, 20, and 15nm.

연속강하운용을 이용한 궤적 기반의 항공기 도착 관리 효과 분석 연구 (A Study on Effect Analysis of Trajectory-Based Arrival Management using Continuous Descent Operations)

  • 오은미;전대근
    • 한국항공운항학회지
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    • 제30권4호
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    • pp.1-8
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    • 2022
  • In this study, we propose trajectory-based arrival management using CDO (Continuos Descent Operations). The operational procedures with TBO (Trajectory-Based Operations) concept were established to allow aircraft and ground system to share the trajectories with each other in real time. The proposed operational concept was validated in the air traffic control simulation environment, which consists of controller working position, pseudo pilot system, air traffic generation system, and controllers' decision support system for arrival management using CDO. Simulation results compared with actual flight data indicate that proposed concept could improve the efficiency of traffic flow management in terms of total descending time and fuel consumption. And it was confirmed that if there is a system that can share and utilize the synchronized trajectory, it can be helpful to control arrival aircraft and apply CDO concept.

DOAS/CRCP 시스템 설계

  • Jeong, Jae-Weon
    • 대한설비공학회지:설비저널
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    • 제35권12호
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    • pp.41-48
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    • 2006
  • For the Designing a Dedicated Outdoor Air System with Ceiling Radiant Cooling Panels the concept of a dedicated outdoor air system(DOAS) with parallel sensible cooling was born from the decoupled system concept, which can be summarized as decoupling of ventilation and air-conditioning functions, or decoupling of sensible and latent load functions. First , remove the latent loads from the outside air(OA) intake and generated in spaces using a 100% OA ventilation system(i.e., DOAS). Second, remove the space sensible loads using a parallel mechanical cooling system, such as fan coil units, conventional variable air volume , and ceiling radiant cooling panel(CRCP) independent of the ventilation system.

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공(空)의 자유(自由)와 AIR CABOTAGE -법적(法的) 개념(槪念)과 그 확대적용(擴大適用)의 제문제(諸問題)- (Freedoms of the Air and Air Cabotage: their legal concept and problems of expanded applications)

  • 홍순길
    • 항공우주정책ㆍ법학회지
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    • 제4권
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    • pp.37-49
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    • 1992
  • In the changing glabal order, international aviation order is also challenged. Regionalism including EC integration press us to review and renew traditional international aviation legal order. Under such a significant circumstances, this paper examines the legal concept of freedoms of air and air cobotage and problems of their expanded applications. The papar particularly analyzes various concepts of cabotage and arguments in the interpretations of article 7 (cabotoge) of Chicago Convention and presents alternatives of future direction to accommodate problems which world aviation community faces today.

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