• 제목/요약/키워드: Variable Configuration

검색결과 213건 처리시간 0.028초

바이모달트램용 종합제어장치(VCU)의 구성 및 적용 (Application and Configuration of Vehicle Control Unit for Bimodal Tram)

  • 이강원;변윤섭;장세기;목재균
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2007년도 춘계학술대회 논문집
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    • pp.1675-1677
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    • 2007
  • Bimodal tram with the hybrid propulsion and low floor is a new and beneficial vehicle for the public transportation which is good for both the convenience of the weakness and the prevention of the green house effect. Bimodal tram consists of a complicate electrical and mechanical systems. Each system does not operate with independent but with cooperative. So, we need a synthetic control management system for managing all system effectively. This paper has investigated the configuration and functions of VCU(Vehicle Control Unit) installed inside of bimodal tram which plays variable roles including the apparatus control and the condition monitoring.

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The Experiments for the Enhancement of Regression Rate of Hybrid Rocket Fuel

  • Shin Kyung-Hoon;Lee Changjin;Yu Yung H.
    • Journal of Mechanical Science and Technology
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    • 제19권10호
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    • pp.1939-1949
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    • 2005
  • Many studies have been conducted to increase regression rate of solid fuel in hybrid rocket. One of them resorts to swirl flow since it can extend the residence time of oxidizer in the fuel grain. Also, metal wires may lead to increase the regression rate of solid fuel as shown in solid propellants. In this study, a series of experiments was designed to investigate the enhancement of regression rate of solid fuel by embedded metal wires and by fuel port grain. And fuel port was designed with a helical configuration to attempt to induce swirl flow. PMMA with gaseous oxygen is the solid fuel used for investigation. Test results showed that embedded metal wires turned out to be ineffective method because only $3-4\%$ increases in regression rate were observed. However, fuel port grain configuration yields higher burning performance of up to $50\%$ increase in regression rate. Also pitch number as well as total impulse was found to be a design variable.

다기능화에 의한 공공도서관의 공간구조에 관한 연구 - 일본 공공도서관을 중심으로 - (A Study on the Spacial Configuration of Public Libraries by the Multi-Functionality - Focus on the Japanese Public Libraries -)

  • 황미영
    • 한국실내디자인학회논문집
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    • 제18권4호
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    • pp.105-115
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    • 2009
  • As database become more variable and multimedia, the integration between conventional library based on printed matter and digital library on IT makes it accelerated that the changes in today's information circumstances. Due to more leisure time modern people who get intellectual and interested in variety so they need continuing education, intellectual satisfaction and cultural life. Consequently today's public library expands to become a source of every kind of information, an educational facility and community facility to fulfill the cultural needs. On the assumption above, this study aims at offering database for planning public library that meets the needs for multifunctional library through analyzing space, structure, and character of modern public libraries and chooses 8 cases in Japan provide both primary and additional functions. Quantitative data from blueprints, websites and publications has been collected to analyze the space arrangement corresponding with the functional characteristics.

An Analysis of Inverse Kinematics and Singular Configuration for Six Axes Robot with Wrist Offset (ICEIC'04)

  • Lee YoungDae;Cho KumBae
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2004년도 ICEIC The International Conference on Electronics Informations and Communications
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    • pp.263-268
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    • 2004
  • The inverse kinematics problem is to find a set of joint variable values that will place the end effector of a robot manipulator into a given pose. Pieper has shown that a sufficient condition for a manipulator to have a closed form solution is that three adjacent joint axes intersects, hence the six axes robot with spherical wrist allows closed form solution. But many industrial robots have a non-spherical wrist to provide a stronger wrist configuration so that they can handle heavy payloads. Also, the use of a non-spherical wrist can result in a cheap and simple wrist arrangement than when all three axes intersect at a common point. In these cases, closed form solutions cannot be found. Therefore numerical technique must be used to solve the inverse kinematics equations. This paper proposes a new algorithm that can be used for finding inverse kinematics solution of the six axes robot with non-spherical wrist. Computer simulations are provided to prove the usefulness of our method.

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Aerodynamic and Structural Design on Small Wind Turbine Blade Using High Performance Configuration and E-Glass/Epoxy-Urethane Foam Sandwich Composite Structure

  • Kong, Changduk;Bang, Johyuk
    • 한국추진공학회:학술대회논문집
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    • 한국추진공학회 2004년도 제22회 춘계학술대회논문집
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    • pp.401-407
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    • 2004
  • This study proposes a interim development result for the l-㎾ class small wind turbine system, which is applicable to relatively low wind speed regions like Korea and has the variable pitch control mechanism. In the aerodynamic design of the wind turbine blade, parametric studies were carried out to determine an optimum aerodynamic configuration which is not only more efficient at low wind speed but whose diameter is not much larger than similar class other blades. A light composite structure, which can endure effectively various loads, was newly designed. In order to evaluate the structural design of the composite blade, the structural analysis was performed by the finite element method. Moreover both structural safety and stability were verified through the full-scale structural test.

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밀도 분포를 이용한 구조물 및 리브의 최적 위상 설계 (Optimal Topoloty Design of Structures and Ribs Using Density Distribution)

  • 정진평;이건우
    • 한국정밀공학회지
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    • 제13권7호
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    • pp.66-77
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    • 1996
  • Optimal topology design is to search the optimal configuration of a structure which can be used as a shape at the conceptual design stage. Our objective is to maximize the stiffness of the structures and ribs under a material usage constraintl. The density of each finite element is the design variable and its relationship with Young's modulus is expressed by quadratic form. The configuration is represented by the entire density distribution, the structural analysis is performed by finite element method and the optimiza- tion is performed by Feasible Direction Method. Feasible Direction Method can handle various problems simultaneously, that is, mult-objectives and multi-constraints. Total computation time can be reduced by the quadratic relationship between the density and the material property and fewer design variables than Homogenization Method. Toplogy optimization technique developed in this research is applied to design the shapes of the ribs.

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Longitudinal reaction on conductors due to tornado wind load

  • Dingyu Yao;Ashraf El Damatty
    • Wind and Structures
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    • 제38권4호
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    • pp.325-339
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    • 2024
  • The longitudinal force resulting from tornado loads on transmission line is considered a crucial factor contributing to the failure of transmission line structures during tornado events. Accurate estimation of this longitudinal force poses a challenge for structural designers. Therefore, the objective of this paper is to provide a set of charts that can be easily used to estimate the peak longitudinal forces transferred from the conductors to a tower. The critical wind field and corresponding configuration considered in this paper are previously studied and determined. The charts should account for all the conductor parameters that can affect the value of the longitudinal force. In order to achieve that, a parametric study is first conducted to assess the variation of the longitudinal forces with different conductor parameters, based on the critical tornado configuration. Results of this parametric study are used to develop the charts that can be used to calculate longitudinal forces by adopting a multi-variable line regression. The forces calculated from charts are validated by finite element analysis. An example for the usage of the charts is provided at the end of this paper.

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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가변주파수 및 임펄스 전류를 이용한 과도접지임피턴스 분석 (An Analysis Method for the Transient Ground Impedance Using Variable Frequency Current and Lightning Impulse)

  • 조성철;엄주홍;이태형
    • 한국조명전기설비학회:학술대회논문집
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    • 한국조명전기설비학회 2007년도 추계학술대회 논문집
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    • pp.231-234
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    • 2007
  • This paper presents an analysis method of transient ground impedance using the lightning impulse and variable frequency currents. The transient ground impedance strongly depends on the configuration and size of grounding electrodes and the shapes of impulse currents, and the inductance of grounding electrodes has a significant affect on the transient impedance of the grounding system. There are some differences between the effective impulse ground impedance which was introduced some papers and the transient ground impedance. The transient ground impedance measured from the peak value of impulse voltage and the peak value of impulse current is more reliable than the effective impulse ground impedance.

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RELIABILITY-BASED DESIGN OPTIMIZATION OF AUTOMOTIVE SUSPENSION SYSTEMS

  • Chun, H.H.;Kwon, S.J.;Tak, T.
    • International Journal of Automotive Technology
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    • 제8권6호
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    • pp.713-722
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    • 2007
  • Design variables for suspension systems cannot always be realized in the actual suspension systems due to tolerances in manufacturing and assembly processes. In order to deal with these tolerances, design variables associated with kinematic configuration and compliance characteristics of suspensions are treated as random variables. The reliability of a design target with respect to a design variable is defined as the probability that the design target is in the acceptable design range for all possible values of the design variable. To compute reliability, the limit state, which is the boundary between the acceptable and unacceptable design, is expressed mathematically by a limit state function with value greater than 0 for acceptable design, and less than 0 for unacceptable design. Through reliability analysis, the acceptable range of design variables that satisfy a reliability target is specified. Furthermore, through sensitivity analysis, a general procedure for optimization of the design target with respect to the design variables has been established.