• Title, Summary, Keyword: Design Characteristic

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A Concept Design Study for Mini Sporty Utility Vehicle (소형 SUB 컨셉카 디자인 연구)

  • 이명기
    • Archives of design research
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    • v.12 no.4
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    • pp.109-118
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    • 1999
  • In the respect of automobile history, the tendency to the development of automobiles for the latest 100 years has been leaded by technical performances. Especially, with the rapid growth of the newest electronic industry, the technical know-hows of automobiles improved in short terms have brought about outstanding results. The differences of the technical know-hows are little between some of the famous automobile manufacturing industries and the rising. So, now, the automobile design became a basis in selecting a car. The latest tendency to automobile style in accordance with the improvement of a universal life quality has been changed to a characteristic design meeting various needs of customers. RV, UV, MPV(and so forth ) meeting their needs made an appearance, or a characteristic model derived from them respectively appeared. We tried to study a new mini SUV-typed-concepcar design with a touch of the next concept. The whole design process from our researches to the end hard model was performed at the Design Center, Daewoo Automobile, based on the automobile design processes. Especially, We styled an automobile concept as inexpensive, characteristic, new one to have a car easily at the young and made an analysis of customers' responses for referring to this study in generating the next SUV-typed-automobile.

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A Study of the Scientific Characteristic of Mathematical Concepts and Curriculum Design (수학적 개념의 과학적 성격과 교육과정 구성과의 관련성 연구)

  • 고정화
    • Journal of Educational Research in Mathematics
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    • v.12 no.2
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    • pp.213-228
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    • 2002
  • We know that curriculum is, first of all, related to teaching materials, namely, contents. Therefore, when we think of mathematics curriculum, we must take account of characteristic of mathematics. Vygotsky has studied the development of scientific concepts and everyday concepts. According to Vygotsky, scientific concepts grow down through spontaneous concepts; spontaneous concepts grow upward through scientific concepts. And mathematics is a representative of subjects dealing with scientific or theoretical concept. Therefore, his study provides scientific basis for mathematics curriculum design. In this context, Davydov notes that everyday concepts are developed through empirical abstraction, while scientific concepts require a theoretical abstraction. And Davydov constructed the curriculum materials for the teaching of number concept. Davydov's curriculum is an example of reflecting Vygotsky' theoretical view and his view about the types of abstraction. In particular, it represents mathematical characteristic of a 'science' by introducing number concept through quantitative relationship and use of signs. In conclusion, stance mathematical concepts have scientific characteristic, mathematics curriculum reflects this characteristic.

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Effect of Volute Area Distributions on the Performance Characteristic Curve of a Centrifugal Pump (볼류트 단면적 변화가 원심펌프의 성능곡선에 미치는 영향)

  • Kim, Deok-Su;Lee, Kyoung-Young;Yoon, Joon-Yong;Choi, Young-Seok
    • Proceedings of the SAREK Conference
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    • pp.558-563
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    • 2005
  • In this paper, the effect of volute area distribution on the performance characteristic curve of a centrifugal pump were numerically studied using a commercial CFD code. To reduce the shutoff head, maintaining head and efficiency at a design flow rate, the flat head-capacity characteristic curves in which the head varies only slightly with capacity from shutoff to design capacity are frequency required. In order to control the shutoff head of a pump, several volute area distributions were proposed as a main parameter with the same impeller geometry. The calculation results show that the characteristic curve of a centrifugal pump can be controlled by modifying the area distribution with the same volute outlet area.

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A Study of Fuel Gauge System Matching Method Using Characteristic Chart to Fuel Consumption Ratio in Vehicles (특성 선도를 이용한 자동차용 연료 지침계의 연료 소비율에 따른 시스템 제어 방법에 관한 연구)

  • Lee, Seon-Bong;Lee, Boo-Youn
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.32 no.2
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    • pp.194-201
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    • 2008
  • In the present study, fuel system matching was analyzed, and a characteristic chart for common use for design-related parts is presented. Based on the characteristic chart thus presented, controlled fuel system matching was tested for a 35-liter fuel system, and actual mass product movement coils were applied to validate the test. The keynote of the present research is the use of the characteristic chart to devise a preferred fuel system matching method. Through the present study, it will be possible to design standard parts for efficient fuel system matching in the near future.

Computation of Section Curves, Reflection Characteristic Lines, and Asymptotic Curves for Visualization (가시화를 위한 단면곡선, 반사성질선, 점근선 생성 기법)

  • 남종호
    • Korean Journal of Computational Design and Engineering
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    • v.8 no.4
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    • pp.262-269
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    • 2003
  • An approach to compute characteristic curves such as section curves, reflection characteristic lines, and asymptotic curves on a surface is introduced. Each problem is formulated as a surface-plane inter-section problem. A single-valued function that represents the characteristics of a problem constructs a property surface on parametric space. Using a contouring algorithm, the property surface is intersected with a horizontal plane. The solution of the intersection yields a series of points which are mapped into object space to become characteristic curves. The approach proposed in this paper eliminates the use of traditional searching methods or non-linear differential equation solvers. Since the contouring algorithm has been known to be very robust and rapid, most of the problems are solved efficiently in realtime for the purpose of visualization. This approach can be extended to any geometric problem, if used with an appropriate formulation.

Design and Characteristic Analysis of a Moving Magnet Type LDM (가동자석형 LDM의 설계 및 특성 해석)

  • Jang, S.M.;Jeong, S.S.;Yoon, I..K.
    • Proceedings of the KIEE Conference
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    • pp.18-20
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    • 1999
  • In the industrial field the necessity of the linear motion is increasing. We selected a moving magnet coreless type LDM, which have the advantages, such as long stoke, brushless, no cogging force. Actually, the design is accomplished using FEM analysis for the basic configuration of a magnetic circuit, and characteristic equations for coil design. In the course of design we have estimated airgap flux density and thrust.

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A Characteristic Analysis of SRM for vehicle with Different Phase Number (전동차용 SRM의 상수변화에 따른 특성 해석)

  • Choi Kyeong-Ho;Kim Kyeong-Sik;Chin yung-Churl
    • Proceedings of the KIPE Conference
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    • pp.981-984
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    • 2004
  • This paper presents the design results and characteristic analysis of SRM. For vehicle power supply for adaptable design of the SRM, variable design parameters, such as stator and rotor laminations, winding details, pole numbers, and pole arcs, phases numbers are required. So, in this paper the SRM design results and the comparison of characteristics for vehicle power supply as phases changed are described.

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Analysis of HVDC Inverter and Application of Objective Functions for the Optimal Filter Design (직류송전 인버터의 필터 최적설계를 위한 해석 및 목적함수의 선정)

  • 오성철;정교범
    • The Transactions of the Korean Institute of Power Electronics
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    • v.6 no.1
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    • pp.82-89
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    • 2001
  • This paper proposes several methods to analyze dynamic and static characteristics of HVDC inverter system. The characteristic analysis is essential of the controller and filter design of the HVDC inverter system. Dynamic characteristic can be analyzed with EMTP simulation and static characteristic can be obtained by solving newly proposed load flow equation which includes the filter and load characteristic. New simple per-phase-equivalent circuit is also proposed. In this circuit, HVDC inverter is considered as a current source depending on the on-off status of switch. Dynamic and static characteristic can be analyzed by the proposed per-phase-equivalent circuit. For the optimal filter design, various performance criteria are proposed. The performance index, based on the per-phase-equivalent circuit, is calculated. Voltage harmonics and filter power loss are selected as criteria. Optimization procedure is explained to find optimal passive filter parameters.

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Psychological Characteristic Analysis of Brick Wall Bonds in Rural Area (농촌지역 공간의 벽돌 담장 줄눈에 나타난 심리적 특성 분석)

  • Kim, Dae-Hyun
    • Journal of Korean Society of Rural Planning
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    • v.18 no.4
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    • pp.61-67
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    • 2012
  • Recently, brick walls are being widely introduced in rural areas. Walls are a very important design element of space. However, most brick wall works do not consider the human psychological characteristics. The purpose of this study was to investigate psychological characteristics on brick wall bonds such as the stack bond, running bond, english bond, flemish bond, america bond. The results of the research can be summarized as follows: 1)There is no statistical difference of psychological evaluation results among student groups using the semantic differential scale method using 10 adjectives. 2)Stack bonds have an uninspiring, artificial, simple, restful, boring and ordered psychological characteristic. Running bonds have an uninspiring, restful and ordered psychological characteristic. America bonds have a unique and modernistic psychological characteristic. English bonds have a unique, modernistic, complex and chaotic psychological characteristic. Flemish bonds have no critical psychological characteristics. 3)The running bond earned the highest score in preference, while the stack bond scored the lowest. Employment of brick wall bonds on this study was not highly preferred, hence it is necessary to develop a new brick wall bond design. 4)In conclusion, the proper selection of brick wall bonds is very important and we should consider human psychological characteristics in the design of rural areas.

Robust Parameter Design for Multiple Performance Characteristics (다성능(多性能) 특성치(特性値)에 관한 안정성설계(安定性設計))

  • Seo, Sun-Keun;Choi, Jong-Deuk
    • Journal of the Korean Society for Quality Management
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    • v.22 no.3
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    • pp.34-53
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    • 1994
  • Taguchi's robust design methodology has focused only on a single performance characteristic or response, but the quality of most products is seldom defined by a characteristic, and is rather the composite of a family of characteristics which are often interrelated and nearly always measured in a variety of units. The multiple performance characteristics problem is how to compromise the conflicts among the selected levels of the design parameters for each individual performance characteristic. In this paper, the modified desirability function using SN ratio which can be optimized by univariate technique is proposed and a parameter design procedure to achieve the best balance among several different response variables is developed We reanalyze two existing case studies by the proposed method and compare these results with ones by the sum of SN ratios and the expected weighted loss.

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