• 제목/요약/키워드: the first configuration analysis

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보강형의 시공방법을 고려한 타정식 현수교의 초기형상해석 모델 (A Structural Analysis Model for the Initial Configuration of a Suspension Bridge Considering the Erection Method of Stiffening Girders)

  • 고성석;강성후;박선준;정재호
    • 대한토목학회논문집
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    • 제29권4A호
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    • pp.337-346
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    • 2009
  • 타정식 현수교의 보강형 가설중의 경계조건과 하중조건의 변화를 고려하여 초기형상을 결정하기 위한 구조해석 모델링 방법 및 해석 알고리즘을 제안하였다. 타정식 현수교의 가설단계를 보강형의 가설시점을 기준으로 보강형 가설단계인 1단계와 완공단계의 2단계로 구분하였으며 이러한 가설단계를 고려하여 초기형상해석 단계를 1차 형상해석과 2차 형상보정해석의 2단계로 구분하였다. 각 해석단계에 대한 보강형의 경계조건과 작용하중의 모델링 방법 및 반복해석 알고리즘을 제안하였으며 실 교량에 대해 수치해석을 수행하여 기존 해석방법에 의한 초기형상해석결과와 비교, 분석하였다. 실 교량에 대한 수치해석 결과 기존 초기형상해석방법의 문제점을 파악할 수 있었으며 본 연구에서 제안된 방법을 적용할 경우 기존 방법의 문제점을 해결할 수 있음을 확인하였다.

한국 치의 공간구성의 변화에 관한 연구 - 서울시 소재 치과대학/치의학대학원과 치과병원 분석을 중심으로 (A Study on the Change of Space Configuration of Dentistry in Korea - Focused on the Analysis of School of Dentistry and Dental Hospital located in Seoul)

  • 정태종;최재필
    • 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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    • 제23권1호
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    • pp.25-36
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    • 2017
  • Purpose: The analysis of space configuration of dentistry through examining Korean dental history and comparison are necessary for the development of planning of the dental healthcare system. This study has been started in order to provide basic information for the planning of hospital architecture in dentistry. Methods: Literature review of space configuration and historical background in dentistry have been conducted. The changes of site plan and space configuration of Seoul National University, Yonsei University and Kyunghee University, School of Dentistry and Dental Hospital have been analyzed in dental history of Korea and corresponding spaces. Results: The result of this study can be summarized in three points. The first one is that space configuration of dentistry in Korea is different from that of West. The clinical treatment space had been started first and the education and research space was followed after a short interval. The second one is that the space configuration in School of Dentistry and Dental Hospital shows that dental space had differentiated and specialized to dental education and clinical space in a building. It had spatially divided and separated to the education and research complex and the dental hospital and it had a branch building. The third one is that the dental public health in Korea has not been actively applied until recently and it should be developed in a near future. Implications: It is necessary to analyze space configuration of other dental schools and their hospitals to develop the relationship between space and program in healthcare system.

축소 차원 형상 공간을 이용한 협조작업 두 팔 로봇의 충돌 회피 경로 계획 (Collision-free path planning for two cooperating robot manipulators using reduced dimensional configuration space)

  • 최승문;이석원;이범희
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1996년도 한국자동제어학술회의논문집(국내학술편); 포항공과대학교, 포항; 24-26 Oct. 1996
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    • pp.904-907
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    • 1996
  • In this paper, we propose an efficient collision-free path planning method of two cooperating robot manipulators grasping a common object rigidly. For given two robots and an object, the procedure is described which constructs the reduced dimensional configuration space by the kinematic analysis of two cooperating robot manipulators. A path planning algorithm without explicit representation of configuration obstacles is also described. The primary steps of the algorithm is as follows. First, we compute a graph which represents the skeleton of the free configuration space. Second, a connection between an initial and a goal configuration to the graph is searched to find a collision-free path.

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액체로켓엔진에서 음향해석을 통한 허브-블레이드 배플 형상의 최적화 (Acoustic Analysis for Design Optimization of Hub-Blade Baffle in Liquid Rocket Engine)

  • 김홍집;김성구;설우석
    • 대한기계학회논문집B
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    • 제28권8호
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    • pp.945-952
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    • 2004
  • Acoustic characteristics of combustion chamber having various baffle configurations are numerically investigated by linear acoustic analysis to suggest reliable baffle specifications in first stage of KSLV-I. To determine the configuration of baffles, an acoustic modal analysis as well as the macroscopic analysis has been done. Hub has another effect of suppressing transverse acoustic mode by confining flow in baffled compartment over general effect of increase in acoustic damping of radial acoustic modes. So, a sufficient number of hub needs to be installed to obtain acoustic damping capacity. 3-blade configuration designed to suppress the first tangential mode has relatively low damping capacity, compared to 5 or 6-blade one. Optimum value of axial baffle length has been determined by comparing acoustic characteristics of combustion chamber having various baffle lengths.

Aerodynamic Damping Analysis of a Vane-type Multi-Function Air Data Probe

  • Lee, Yung-Gyo;Park, Young-Min
    • International Journal of Aeronautical and Space Sciences
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    • 제14권1호
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    • pp.99-104
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    • 2013
  • Configuration design, analysis, and wind tunnel test of a vane-type multi-function air data probe (MFP) was described. First, numerical analysis was conducted for the initial configuration of the MFP in order to investigate aerodynamic characteristics. Then, the design was modified to improve static and dynamic stability for better response characteristics. The modified configuration design was verified through wind tunnel tests. The test results are also used to verify the accuracy of the analytical method. The analytically estimated aerodynamic damping provided by the Navier-Stokes equation solver correlated well with the wind tunnel test results. According to the calculation, the damping coefficient estimated from ramp motion analysis yielded a better correlation with the wind tunnel test than pitch oscillation analysis.

Finite element fracture reliability of stochastic structures

  • Lee, J.C.;Ang, A.H.S.
    • Structural Engineering and Mechanics
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    • 제3권1호
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    • pp.1-10
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    • 1995
  • This study presents a methodology for the system reliability analysis of cracked structures with random material properties, which are modeled as random fields, and crack geometry under random static loads. The finite element method provides the computational framework to obtain the stress intensity solutions, and the first-order reliability method provides the basis for modeling and analysis of uncertainties. The ultimate structural system reliability is effectively evaluated by the stable configuration approach. Numerical examples are given for the case of random fracture toughness and load.

On the Trade-Off between Throughput Maximization and Energy Consumption Minimization in IEEE 802.11 WLANs

  • Serrano, Pablo;Hollick, Matthias;Banchs, Albert
    • Journal of Communications and Networks
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    • 제12권2호
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    • pp.150-157
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    • 2010
  • Understanding and optimizing the energy consumption of wireless devices is critical to maximize the network lifetime and to provide guidelines for the design of new protocols and interfaces. In this work, we first provide an accurate analysis of the energy performance of an IEEE 802.11 WLAN, and then we derive the configuration to optimize it. We further analyze the impact of the energy configuration of the stations on the throughput performance, and we discuss under which circumstances throughput and energy efficiency can be both jointly maximized and where they constitute different challenges. Our findings are that, although an energy-optimized configuration typically yields gains in terms of throughput as compared against the default configuration, it comes with a reduction in performance as compared against the maximum-bandwidth configuration, a reduction that depends on the energy parameters of the wireless interface.

커피전문점의 VMD 구성요인이 브랜드자산과 재구매의도에 미치는 영향 (An Influence of VMD configuration factors of Coffee shops on Brand equity and Repurchase intention)

  • 김상수;송인암;황희중
    • 유통과학연구
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    • 제10권11호
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    • pp.39-53
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    • 2012
  • Purpose - This study identifies relationships amongst repurchase intentions, brand equity, and preference by applying VMD of fashion retail stores. The results would help coffee shop owners and coffee makers in devising an appropriate strategy for successfully managing coffee shops. Research design, data, methodology - The VMD model of a coffee shop includes harmony, trend, and attractiveness, while brand equity encompasses brand awareness, perceived quality, and brand image. In this study, the VMD factors of coffee shops, brand equity, and brand preference, are shown as independent variables, while repurchase intention is shown as the dependent variable. The study aims to ascertain the extent of the influence configuration factors of a coffee shop have on brand equity, brand preference, and repurchase intention. Regression analysis was used to verify the mediating effects of brand preference on brand equity and repurchase intention. The measurement items were already deemed as reliable and valid in the previous study, but some modifications were made for the purposes of this study. Questionnaires were distributed to 550 consumers on a national scale, and 517 consumers amongst these were finally used as a sample for analysis using the SPSS 17.0 statistical program. Results - First, amongst the VMD configuration factors of a coffee shop, trend, and attractiveness have a positive impact on brand equity (brand awareness, perceived quality, and brand image). Second, brand equity has a positive effect on brand preference. Third, brand preference has a positive effect on repurchase intention. Fourth, brand preference plays the role of a mediator in measuring the impact of brand awareness and brand image on customers' repurchase intentions. Conclusions - The theoretical implications can be summarized as follows. First, this study proposes a theoretical basis that can be adapted to the VMD configuration factors of a coffee shop by identifying the relationship between brand equity and coffee shops. This study applies the VMD factors to the coffee shops and presents a new research model by examining the relationships amongst VMD components of coffee shops: brand equity, brand preference, and repurchase intention. Second, it clearly establishes the relationship between brand equity and brand preference by identifying the mediating effects of brand preference, given that brand equity has a positive impact on repurchase intention. The practical implications are as follows. First, development of brand equity and management can be important components for coffee shops in determining that the VMD configuration factors of coffee shops have an impact on brand equity. Second, amongst the VMD configuration factors, attractiveness and trend have a positive influence on choosing coffee shops, therefore store atmosphere should be attractively designed, while the menu and interiors should complement each other and be reviewed periodically to conform to the latest trend. Third, VMD configuration factors that are confirmed are not easily changed. Fourth, large franchises and foreign companies have strengths in scale, locations, and brand. Fifth, the different ways of campaigning should be compared to those of large franchises and foreign companies in order to increase brand equity using VMD configuration factors.

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종합병원 외래진료부의 진로인지를 위한 공간구조 특성에 관한 연구 (A Study on the Characteristics of Spatial Configuration for Wayfinding in General Hospital O. P. D.)

  • 한기증;이특구
    • 한국실내디자인학회논문집
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    • 제15권5호
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    • pp.183-192
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    • 2006
  • This study analyzes the characteristics of special configuration for wayfinding in general hospitals. To that end, the study categorizes four different hospitals, according to the type of their wayfinding systems. It aims at utilizing the result of the analysis for wayfinding system in general hospitals by applying three elements of analysis methods', perpetual access, depth, and intelligibility. The study result shows as follows: First, there is no difference in special hierarchy when hospitals are analyzed and divided by halls and streets. It means that outpatient departments are located by spatial function and characteristics rather than form of spatial configuration. Second, we found that fewer direction changes are conducive to easier circulation in terms of wayfinding, when we analyzed spatial depth from the main entrances to the outpatient departments. Third, regarding intelligibility, intelligibility of Chungang University Hospital ranked highest. Kunkook University Hospital, Dongkook University Hospital and Seoul National University Hospital ranked 2nd, 3rd, and 4th respectively. It means that difficulty level of wayfinding is not decided by the characteristics of special configuration such as hospital hall and hospital streets but depends on location planning. The difficulty level of wayfinding mainly relies on location planning.

농촌마을 공간구성에 관한 특성 분석 - 고드미녹색마을, 명심체험마을, 오박사마을을 중심으로 - (Analysis of the Characteristics of Spatial Composition in Rural Village - Focused on Godeumi Village, Myeongsim Experience Village, Ohbaksa Village -)

  • 정다영;리신호
    • 농촌계획
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    • 제19권4호
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    • pp.329-338
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    • 2013
  • The purpose of this study is that suggest space composition in rural village so that it can had foundations for Activation of regional community by analysis and re-organization of rural community places based on regionality and historicity. First, this study have been investigated about changes of overall space configuration and community places that has been lost or were ongoing in rural village. Factors of changes were changes in lifestyle, rural policy, social and political system, economic principles and ect. Therefore, This study focused on understanding basic principles of rural village space configuration and inherited it. Second, basic principle of the space configuration of rural village were entryway and center that improve community cohesion in the community space. This study figured out improving of "Ma-Dang" and functional mix-use community hall was important for more efficient management. Third, This study set direction according to characteristic of space configuration of each village and suggested detail plans.