• 제목/요약/키워드: Passive elements

검색결과 320건 처리시간 0.02초

A Multiplex Housing Energy Conservation Strategy through Combining Insulation Standard Based Green Roof Systems and Passive Design Elements

  • Son, Hyeongmin;Park, Dong Yoon;Chang, Seongju
    • KIEAE Journal
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    • 제14권1호
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    • pp.31-38
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    • 2014
  • Recently, the coverage of urban forests has been rapidly decreasing as the cities are created and expanding. Consequently, there arise urban problems such as heat island effect, urban flooding, urban desertification and so on. In this context, green roof systems is considered to be an efficient alternative to deal with these problems. However, it is difficult to apply green roof to new buildings since the majority of the buildings in cities are already constructed and the demand for new building constructions is not high enough. Therefore, it should be considered to apply green roof system to existing buildings for resolving various problems. This study evaluates heating and cooling energy consumption based on the combination of passive design factors such as wall, roof, window insulation in addition to a green roof system applied to an existing house by using an energy simulation program. Total 8 potential improvement cases are developed. Each case is applied to the same house with different insulation standard for simulations. Through the analysis of the simulated cases with the chosen test house, it is confirmed that heating energy consumption decreases as improvement cases are applied, but cooling energy consumption is relatively not much affected by each improvement case. In addition, when each improvement case is applied to already highly insulated house, the effect of thermal energy improvement decreases while the same improvement that is applied to the case with low insulated house tends to yield higher improvement rate.

조직문화유형별 종업원의 직무인지도 차이에 관한 연구 (A Study on the Differences about the Employee's Cognitive Jop Within the Organization Culture)

  • 강정애
    • 인지과학
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    • 제7권1호
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    • pp.85-103
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    • 1996
  • 본논문은 조직문화 유형에 따라 종업원의 직무인지도에 차이가 존재하는가에 관한 연구이다.이미 많은 선행 연구를 통해 조직문화 유형과 조직성과간의 관계규명이 이루어져 왔지만 본 논문에서는 Rousseau가 제시한 조직문화 모형을 적용시켜 조직내 종업원들의 직무인지도 차이에 관한 연구를 시도하였다.Rousseau의 조직문화모형은 건설형문화,수동적 방어형 문화, 적극적 방어형 문화의 3가지로 구분되는데 각 문화와 종업원의 직무인지도간에 어던 특성이 존재하는가를 실증적으로 검증해 보았다.건설형 문화형태의 조직구성원은 결과변수로 채택한 태도변수간에 매우 긍적적인 특성을 보이고 있었다.방어형 문화형태의 하나인 수동적 방어형 문화형태의 조직구성원은 태도변수값이 모두 마이너스를 나타냈으므로 역의 관계가 있음을 알 수 있었다. 반면에,적극적 방어형 문화형태의 결과는 건설형 문화형태와는 비교할 수 없지만 수동적 방어형 문화 형태의 결과에 비해서는 약간 긍정적인 관계로 나타났다.그러므로,조직성과 향상을 위해서는 조직문화의 형태가 건설형 문화형태를 갖도록 하고 방어적인 문화형ㅇ태를 최적화하도록 조직문화를 개발시키는 것이 바람직한 것으로 본 연구를 통해서도 확인 할수 있었다.

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전통농촌주택의 환경친화성에 관한 연구 (Green Design Principles and Techniques of Korean Folk Houses in Rural Area)

  • 한동욱
    • 한국농촌건축학회논문집
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    • 제1권2호
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    • pp.15-27
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    • 1999
  • The Korean folk house, especially in rural area, has created the comfortable indoor environment with passive control of outdoor climate as environmental architecture. This study aims to identify the peculiar elements of sustainable architecture in folk houses in rural areas of Cheju Island and Ullŭng Island through the field experiments. The elements of environmental control of folk houses in both islands could be developed as the design elements of modern rural architecture. This effort can play major role to find the green design principles and techniques of environmental control of the building which have been neglected in the design of modern architecture.

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장수명 공동주택의 친환경 요소기술 및 계획기법 체크리스트 구성에 관한 연구 (Study on the check list composition at Sustainable building strategies and Design methods of Long-life housing)

  • 한남수;이영
    • 한국주거학회논문집
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    • 제21권1호
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    • pp.103-112
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    • 2010
  • This Study is about the check-List composition for 'Low carbon green growth' of Long-life housing. That utilization for required the check-list composition at Sustainable building strategies and Design methods. That for long life housing, sustainable building strategies part of building construction and interior, the proper foundation for legislative system, maintenance methods with in building life cycle, sustainable and green architecture capability realization prepare for connection plan with 'Low carbon-green growth'. Extracting from elements of Architectural planing answer to basic concept of Low carbon-green growth and aimed at Low carbon scheme for energy saving, green growth scheme for environmental conservation as to each application purpose reconstitute by classify Check-list category about elements of Architectural planing. Through this architectural research deduce elements of architectural planing that can be research utilization with in Check-list composition.

Mitigation of progressive collapse in steel structures using a new passive connection

  • Mirtaheri, Masoud;Emami, Fereshteh;Zoghi, Mohammad A.;Salkhordeh, Mojtaba
    • Structural Engineering and Mechanics
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    • 제70권4호
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    • pp.381-394
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    • 2019
  • If an alternative path would not be considered for redistribution of loads, local failure in structures will be followed by a progressive collapse. When a vertical load-bearing element of a steel structure fails, the beams connected to it will lose their support. Accordingly, an increase in span's length adds to the internal forces in beams. The mentioned increasing load in beams leads to amplifying the moments there, and likewise in their corresponding connections. Since it is not possible to reinforce all the elements of the structure against this phenomenon, it seems rational to use other technics like specified strengthened connections. In this study, a novel connection is suggested to handle the stated phenomenon which is introduced as a passive connection. This connection enables the structure to tolerate the added loads after failing of the vertical element. To that end, two experimental models were constructed and thereafter tested in half-scale, one-story, double-bay, and bolted connections in three-dimensional spaces. This experimental study has been conducted to compare the ductility and strength of a frame that has ordinary rigid connections with a frame containing a novel passive connection. At last, parametric studies have been implemented to optimize the dimensions of the passive connection. Results show that the load-bearing capacity of the frame increased up to 75 percent. Also, a significant decrease in the displacement of the node wherein the column is removed was observed compared to the ordinary moment resisting frame with the same loads.

제로에너지건축물의 에너지 소요량과 생산량 비교를 통한 패시브와 액티브 요소의 투자 검토 연구 (A Study on the Investment Review of Passive and Active Elements through Comparison of Energy Demand and Generation Variation of Zero Energy Building)

  • 이순명;이태규;김정욱
    • 대한건축학회논문집:계획계
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    • 제34권11호
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    • pp.13-22
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    • 2018
  • At the time when zero energy building is expected to be generalized, this study examines whether the investment in the passive element or the active element is more effective in terms of energy in the construction process of zero energy building. In other words, the effect of energy demand by passive element and the change of energy generation by active element are examined in terms of the same investment cost. The purpose of this study is to examine the change of energy demand by passive element and the change of energy generation by active element in zero energy building and to make reasonable investment decision by comparing energy with cost aspect. For this purpose, we selected the buildings to be subjected to energy simulation and derive the required energy amount and energy generation amount by using meteorological data of four regions in Korea. The change of energy demand and energy generation according to the change of application condition was derived. In order to compare and analyze the changes in energy demand and generation at the same cost standard through price survey and quotation of window and photovoltaic power generation equipment.

기후에 순응하는 환경-친화적 구축 기법 특성에 관한 연구 (A Study on the Characteristics of Friendly Building Techniques of Environment to Adapt to Climate)

  • 김정곤;고귀한
    • 한국실내디자인학회논문집
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    • 제22권6호
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    • pp.3-10
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    • 2013
  • This study intends to clarify the key elements of designing low energy residential building construction by planning out residential construction in nature oriented designing method utilizing nearby environment and nature oriented energy from designing stage instead of construction of low energy residential building. Development of building technology is proportional to the development of technology that lasts already. However, what is no less important than the advancement of technology, it is the study of fundamental phenomena energy use in response to climate, reduction, such as recycling. It is possible in such a purpose, it is assumed that there is a need to study elements implementation plan in accordance with the climatic characteristics of the study. Method for controlling the condition solar radiation, sunshine, depending on the characteristics of the weather, by utilizing the convection phenomenon of nature, to maintain the air comfort in the interior space is the essence of eco-friendly construction and passive Property This is an important architectural elements to be aim. For through the analysis of this case, corresponding to the phenomenon of the features of the macro climate and micro climate due to climate change, a combination building blocks of classification placement of each, shape, structure, elevation, space, of the material appeared in various it was possible to know the construction characteristics were. As shown in each case, construction method to address climate change has been found to apply to a comprehensive analysis climatic characteristics of each region, in response to this, the construction of element each corresponding.

Design of a Compact Antenna Array for Satellite Navigation System Using Hybrid Matching Network

  • Lee, Juneseok;Cho, Jeahoon;Ha, Sang-Gyu;Choo, Hosung;Jung, Kyung-Young
    • Journal of Electrical Engineering and Technology
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    • 제13권5호
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    • pp.2045-2049
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    • 2018
  • An antenna arrays for a satellite navigation systems require more antenna elements to mitigate multiple jamming signals. In order to maintain the small array size while increasing the number of antenna elements, miniaturization technique is essential for antenna design. In this work, an electrically small circular microstrip patch antenna with a 3 dB hybrid coupler is designed as an element antenna, where the 3 dB hybrid coupler can yield the circularly polarized radiation characteristic. The miniaturized element antenna typically has too large capacitance in GPS L1 and GLONASS G1 bands, making it difficult to match with a single stand-alone non-Foster matching circuit (NFMC) in a stable state. Therefore, we propose a new matching technique, referred to as the hybrid matching method, which consists of a NFMC and a passive circuit. This passive tuning circuit manages reactance of antenna elements at an appropriate capacitance without a pole in the operating frequency range. The antenna array is fabricated, and the measured results show a reflection coefficient of less than -10 dB and an isolation of greater than 50 dB. In addition, peak gain of the proposed antenna is increased by 22.3 dB compared to the antenna without the hybrid matching network.

방송사 건물의 친환경 설계 적용 요소에 대한 에너지 소비 분석 연구 (The Energy Consumption Analysis for the Eco-friendly Design Application Factors of a Broadcasting Building)

  • 김배영;윤혜경
    • 대한건축학회논문집:계획계
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    • 제34권2호
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    • pp.41-48
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    • 2018
  • This study is expected to provide some basic data on how to apply more economical and efficient eco-friendly factors to reduce the carbon emissions. It has been scrutinized and analyzed the environmental factors of passive eco-friendly elements along with active eco-friendly elements as more efficient factors for energy conservation based on the case of a newly constructed broadcasting building with the green building certification in Sangam-dong DMC area. The first analysis was the energy consumption trends in Korea and the necessity of energy saving. Secondly, it was examined the energy consumption in the current status of the broadcasting building. Thirdly, it was looked into the correlation between the eco-friendly design application factors applied to the broadcasting building and the energy consumption types. As a result of the analysis, the application of fan and feed pump inverter along with ventilation system of waste heat recovery ventilation system were more meaningful in accordance with the economic feasibility of broadcasting buildings rather than economical effect of passive elements such as rooftop garden, reinforcement of building insulation. Also, the application of lighting control had the economical feasibility. Therefore, when it is intended to change the green building certification energy related evaluation items of the similar broadcasting building types, it is necessary to change the direction of adding weight to the more economical active element items in the future.

Nonlinear analyses of structures with added passive devices

  • Tsai, C.S.;Chen, Kuei-Chi
    • Structural Engineering and Mechanics
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    • 제18권4호
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    • pp.517-539
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    • 2004
  • Many types of passive control devices have been recognized as effective tools for improving the seismic resistance of structures. A lot of past research has been carried out to study the response of structures equipped with energy-absorbing devices by assuming that the behavior of the beam-column systems are linearly elastic. However, linear theory may not be adequate for beams and columns during severe earthquakes. This paper presents the results of research on the nonlinear responses of structures with and without added passive devices under earthquakes. A new material model based on the plasticity theory and the two-surface model for beams and columns under six components of forces is proposed to predict the nonlinear behavior of beam-column systems. And a new nonlinear beam element in consideration of shear deformation is developed to analyze the beams and columns of a structure. Numerical results reveal that linear assumption may not be appropriate for beams and columns under seismic loadings, especially for unexpectedly large earthquakes. Also, it may be necessary to adopt nonlinear beam elements in the analysis and design process to assure the safety of structures with or without the control of devices.