• Title/Summary/Keyword: Detailed Performance Procedures

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Strength Demand Calculation for Retrofitting Unreinforced Masonry Buildings Based on the Displacement Coefficient Method and the Preliminary Seismic Evaluation Procedure (변위계수법 및 약산식 내진성능평가에 기초한 비보강 조적조 건물의 내진보강 요구강도 산정)

  • Seol, Yun Jeong;Park, Ji-Hun;Kwak, Byeong Hun;Kim, Dae Ho
    • Journal of the Earthquake Engineering Society of Korea
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    • v.26 no.1
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    • pp.31-38
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    • 2022
  • Based on the nonlinear static analysis and the approximate seismic evaluation method adopted in "Guidelines for seismic performance evaluation for existing buildings, two methods to calculate strength demand for retrofitting individual structural walls in unreinforced masonry buildings are proposed." The displacement coefficient method to determine displacement demand from nonlinear static analysis results is used for the inverse calculation of overall strength demand required to reduce the displacement demand to a target value meeting the performance objective of the unreinforced masonry building to retrofit. A preliminary seismic evaluation method to screen out vulnerable buildings, of which detailed evaluation is necessary, is utilized to calculate overall strength demand without structural analysis based on the difference between the seismic demand and capacity. A system modification factor is introduced to the preliminary seismic evaluation method to reduce the strength demand considering inelastic deformation. The overall strength demand is distributed to the structural walls to retrofit based on the wall stiffness, including the remaining walls or otherwise. Four detached residential houses are modeled and analyzed using the nonlinear static and preliminary evaluation procedures to examine the proposed method.

Seismic Response of Concrete Walls with Steel Boundary Elements (강재 경계요소를 갖는 콘크리트 벽체의 내진 성능)

  • 조순호
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • 2000.04a
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    • pp.290-297
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    • 2000
  • A new form of construction utilizing structural steel as the boundary elements in ductile flexural concrete walls is proposed to solve the bar congestion problems associated with such a heavily reinforced region. Two wall specimens containing rectangular hollow structural sections(HSS) and channels at their ends respectively were constructed rectangular hollow structural sections(HSS) and channels ar their ends respectively were constructed and tested under reversed cyclic loading to evaluate the construction process as well as the structural performance. One companion standard reinforced concrete wall specimen was also tested for the comparison purpose At an Initial stage all three specimens were carefully detailed to have the approximately same flexural capacity. Analysis and comparison of test results indicated that the reversed cyclic responses of the three walls showed similar hysteretic properties but in those with steel boundaries local bucking of the corresponding steel elements following significant yielding of structural steel was prominent. Design procedures considering local instability of the structural steel elements and the interaction between steel chord and concrete web members in such composite walls are presented.

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Design and Construction Experiences of 10kWe Dish-type Solar Thermal Power Generation System (Dish형 집광장치 이용 10kWe급 태양열 발전시스템 설계 및 시공 사례)

  • Lee, Sang-Nam;Kang, Yong-Heack;Jo, Dok-Ki;Yu, Chang-Kyun;Yoon, Hwan-Ki;Kim, Jin-Soo
    • 한국신재생에너지학회:학술대회논문집
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    • 2005.11a
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    • pp.684-687
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    • 2005
  • KIER has been running a demonstration project for 10kWe solar thermal power generation. the project is to build and operate the first solar thermal power generation system in Korea. For concentrating solar thermal energy $40m^2$ dish type concentrator was adapted and a stirling engine is going to be integrated to the system for power production. At the moment building the dish concentrator including mirror and sun tracking system was completed and it's performance are being closely evaluated. This paper will introduce some detailed designs and construction procedures which we have experienced so far.

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Inverter Driven Air-Conditioner With Power Factor Correction Circuit (역률제어회로를 갖는 인버터 구동 에어컨)

  • 권경안;박병욱;김정태;정용채
    • The Transactions of the Korean Institute of Power Electronics
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    • v.4 no.1
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    • pp.105-110
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    • 1999
  • This paper describes the inverter driven air-condetioner with power factor correction (PFC) circuit. By adopting PFC in the rectifier, we can reduce harmonic injection into power line, improve the efficiency and lower the total system cost compared to conventional inverter only. Also, system performance is improved by stabilizing the output voltage of PFC. In this paper, detailed design procedures for PFC are given, and the several merits with PFC are verified through the simulation and experiment.

Design and Construction Experiences of Solar Thermal Chemical Reaction Hybrid Power Generation (태양열 화학반응 복합발전시스템의 설계 및 시공 사례)

  • Lee, Sang-Nam;Kang, Yong-Heack;Kim, Jin-Soo;Yoon, Hwan-Ki;Yu, Chang-Kyun;Kim, Jong-Kyu
    • 한국신재생에너지학회:학술대회논문집
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    • 2007.06a
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    • pp.688-692
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    • 2007
  • Solar thermal power generation allows additional benefits of cheap thermal storage and easy hybridization with other fossil fuel-driven power generation. KIER has been performing the project for solar thermal chemical reaction hybrid power generation. The project is to build and operate the first solar thermal chemical reaction hybrid power generation system in Korea. For concentrating solar thermal energy $m^2$ dish type concentrator was adapted and a heliostat is installed for reflecting horizontal insolation to the dish concentrator. At the moment building the dish concentrator including mirror and heliostat with sun tracking system was completed and it's performance are being closely evaluated. This paper will introduce some detailed designs and construction procedures which we have experienced so far.

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Polynomial Fuzzy Radial Basis Function Neural Network Classifiers Realized with the Aid of Boundary Area Decision

  • Roh, Seok-Beom;Oh, Sung-Kwun
    • Journal of Electrical Engineering and Technology
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    • v.9 no.6
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    • pp.2098-2106
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    • 2014
  • In the area of clustering, there are numerous approaches to construct clusters in the input space. For regression problem, when forming clusters being a part of the overall model, the relationships between the input space and the output space are essential and have to be taken into consideration. Conditional Fuzzy C-Means (c-FCM) clustering offers an opportunity to analyze the structure in the input space with the mechanism of supervision implied by the distribution of data present in the output space. However, like other clustering methods, c-FCM focuses on the distribution of the data. In this paper, we introduce a new method, which by making use of the ambiguity index focuses on the boundaries of the clusters whose determination is essential to the quality of the ensuing classification procedures. The introduced design is illustrated with the aid of numeric examples that provide a detailed insight into the performance of the fuzzy classifiers and quantify several essentials design aspects.

A Comparative Study on FTA Verification System Among Korea vs USA, EU (한국과 미국, EU의 FTA협정 상 원산지검증에 대한 비교연구)

  • Kim, Man Gil;Chung, Jae Wan
    • THE INTERNATIONAL COMMERCE & LAW REVIEW
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    • v.58
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    • pp.267-286
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    • 2013
  • Origin verification is regarded most essential for FTA performance administration. This administration is divided into direct and indirect system where Korea has adapted indirect system to Korea-EU FTA while direct system to Korea-USA FTA. A comparative analysis was conducted on the system of origin verification and provisions contained in preferential tariff law of each countries. The study finds that Korean origin verification system is a bit lack of procedural provision resulting in less protection of domestic trader's rights. Another point is that Korean Customs Authority is weak, in respect of organization and man power, to protect illegal bilateral tariff application by counter part FTA countries. And therefore this study suggests the policy makers to arrange detailed FTA origin verification procedures with earliest meeting with counter part FTA countries, and further stress that make up of organization and man power for origin verification in a timely manner.

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Design and Tests of an Airship Pressurization System (비행선 여압장치 설계 및 시험)

  • Lee, Yung-Gyo;Kim, Dong-Min;Lee, Jin-Woo;Yeom, Chan-Hong
    • Proceedings of the KSME Conference
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    • 2004.04a
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    • pp.1709-1714
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    • 2004
  • Pressurization system of a 50m unmanned airship was manufactured according to the detailed design. In this paper. the whole procedures including system design. simulation and fabrication were described. The fabricated part were ground tested to check compliances with design requirements. Ground tests include operational tests, leakage tests, endurace tests and low temperature environmental tests. Results shows pressurization system of a 50m unmanned airship meets design requirements. Currently. pressurization system is installed to the KARI airship, Via 50m and performance verification through the flight tests are being conducted.

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Spacecraft Bus Initial Activation and Checkout of a LEO Satellite (저궤도 위성의 본체 초기 점검)

  • Jeon, Moon-Jin;Kwon, Dong-Young;Kim, Day-Young
    • Aerospace Engineering and Technology
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    • v.11 no.2
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    • pp.33-38
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    • 2012
  • A LEO Satellite performs automatic initial operations by FSW after separation from a launch vehicle. After initial operation by FSW is finished, preparation for normal operation is performed by ground during bus initial activation and checkout phase. First of all, we check state of health of the satellite including solar array deployment status. After then, each unit of spacecraft bus is activated and checked. After activation and checkout of every units used for normal operation, we check maneuver performance for imaging mission and orbit maintenance performance. Because the Bus IAC is performed during limited ground contact time, every detailed procedure must be designed considering ground contact. Therefore, the Bus IAC procedure is separated into several parts based on ground contact duration. In addition, the procedures for every possible operation including expected situation as results of IAC procedures and unexpected contingency situation must be prepared. The contingency operation is also designed based on ground contact duration. The LEO satellite was successfully launched and the Bus IAC was successfully performed. In this paper, we explain design concepts and execution results of Bus IAC.

Performance-Oriented Procurement Process and VE/PSC for Private Finance Initiatives (민간투자사업의 성능중심적 발주방식 및 PSC의 활용방안)

  • Lim Jong-Kwon;Park Heung-Min;Jung Kun-Ho;Woo Ji-Won
    • Proceedings of the Korean Institute Of Construction Engineering and Management
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    • 2004.11a
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    • pp.51-58
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    • 2004
  • The input-oriented project promotion system private participation in infrastructure projects currently in use in Korea has encountered difficulties in securing the primary benefits of private sector creativity problem solving and inflow of private capital. As such, the performance (or output)-oriented procurement process implemented in England and other developed countries should be evaluated for introduction. In Korea, private participation projects are currently identified as either solicited or unsolicited projects, each with different promotional procedures, the problem with these procedures is that competition is not pre-activated, the private sectors creativity is under utilized, and the rationality of project evaluations is inconsistent. Korea should, in order to raise the level of private sector creativity and efficiency, go beyond the currently applied Input Specification project promotion system to a Performance-oriented system similar to those implemented in England and other countries. To achieve this, we mate several proposals for the introduction of the performance-oriented system. We divide the main features of our proposals into three categories, including a reformed concessionaire selection system, a performance orientation in preparation of the concession agreement, and a performance orientation in contract management, and discuss each. 1'his study describes performance-oriented promotion systems in an output-focused way As this is an initial study on the introduction of performance orientation in private participation, various key points and proposals were identified. However, in the future, detailed research in technical fields and systems, legal research, and practical projects will be needed for implementation

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