• 제목/요약/키워드: Flexible Criteria

검색결과 153건 처리시간 0.027초

Multi-Optimal Designs for Second-Order Response Surface Models

  • Park, You-Jin
    • Communications for Statistical Applications and Methods
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    • 제16권1호
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    • pp.195-208
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    • 2009
  • A conventional single design optimality criterion has been used to select an efficient experimental design. But, since an experimental design is constructed with respect to an optimality criterion pre specified by investigators, an experimental design obtained from one optimality criterion which is superior to other designs may perform poorly when the design is evaluated by another optimality criterion. In other words, none of these is entirely satisfactory and even there is no guarantee that a design which is constructed from using a certain design optimality criterion is also optimal to the other design optimality criteria. Thus, it is necessary to develop certain special types of experimental designs that satisfy multiple design optimality criteria simultaneously because these multi-optimal designs (MODs) reflect the needs of the experimenters more adequately. In this article, we present a heuristic approach to construct second-order response surface designs which are more flexible and potentially very useful than the designs generated from a single design optimality criterion in many real experimental situations when several competing design optimality criteria are of interest. In this paper, over cuboidal design region for $3\;{\leq}\;k\;{\leq}\;5$ variables, we construct multi-optimal designs (MODs) that might moderately satisfy two famous alphabetic design optimality criteria, G- and IV-optimality criteria using a GA which considers a certain amount of randomness. The minimum, average and maximum scaled prediction variances for the generated response surface designs are provided. Based on the average and maximum scaled prediction variances for k = 3, 4 and 5 design variables, the MODs from a genetic algorithm (GA) have better statistical property than does the theoretically optimal designs and the MODs are more flexible and useful than single-criterion optimal designs.

아프가니스탄 케심-파이자베드간 도로복구사업 해외설계 사례 (Overseas Design Introduction of Road Rehabilitation Project in Keshim~Faizabad, Afghanistan)

  • 정동호;김우선;김기백;정원준;이승우
    • 한국지반공학회:학술대회논문집
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    • 한국지반공학회 2008년도 추계 학술발표회
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    • pp.569-580
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    • 2008
  • If slope height was more than 20 meters, we conducted an analysis of stereographic projection and limit equilibrium at this slope. We proposed reduction of slope face angle and reinforcement of rock bolt depending on analysis. Blasting design : Standard pattern based on result of local test blasting was made for blasting design. Vibration criterion was set for less than 3.0mm/s because of outworn buildings and inhabitants opinions. Production blasting and Controlled blasting has been done as Construction standard pattern. After Vibration Monitoring has been done, so that we can control of complement. "Bidding Document" and AASHTO 2001 "A Policy on Geometric Design of Highways and Streets" were so for design criteria of earthwork but they were different actual design criteria and left something to be desired in Afghanistan. Therefore, although "Bidding Document" and "AASHTO 2001" were basic design criteria, domestic design criteria was reflected in this design criteria for complement by discussion with supervisor. Drainage design : For stability ratio, ditch of arch block and stonework was designed by rainfall data for the 13 years and discussion with supervisor. Pavement was designed as flexible pavement. Because these days in Afghanistan postwar repair works, especially urgent repairing of roads and newly making of roads, are very highly in progress, I think that Afghanistan is the region about which our construction technical experts should have great concerns.

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친환경건축물 인증제도 평가 항목 보완에 관한 기초 연구 -오픈하우징 관련 항목을 중심으로- (The Basic Study on the Complementation of Green Building Certification Criteria in Consideration of Open Housing -Focus on the Related Items of the Open Housing-)

  • 황은경;임석호;이상호
    • 한국주거학회논문집
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    • 제14권5호
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    • pp.141-151
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    • 2003
  • Recently, the housing market in Korea has been changed from new construction to building-stocks, and focusing on supplier to focusing on users. Open housing is a design method not only content to users' various needs but also to the means of sustainable development by adapted to longevity of buildings. There are some indicators for Open Housing related to Green Building Certification Criteria which were worked by Mock & ME. But those indicators are limited to flexible design methods. This is a basic study for the selecting of Open Housing indicators for complementation of Green Building Certification Criteria by the analysis of SI housing in Japan, domestic Green Building Labelling and those of other countries.

철도소프트웨어 개발 및 평가프로세스 제안 (Suggestion of Development and Assessment Procedure for Railway Software)

  • 정의진;신경호
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2008년도 춘계학술대회 논문집
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    • pp.378-383
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    • 2008
  • One of the main concerns of railway system is to secure safety. Nowadays digital technology has been rapidly applied to safety critical system. The digital system performs more varying and highly complex functions efficiently compared to the existing analog system because software can be flexibly designed and implemented. The flexible design makes it difficult to predict the software failures. For this reason, the safety criteria are suggested to secure the software safety for the field of railway system. Following them, the railway software have to be examined whether it is properly developed according to the safety criteria and certification process. Because the articles suggested in safety criteria are written in legal term, it is difficult to apply the criteria to develop railway software. This paper suggests and discusses a development and assessment procedure to solve these issues for railway software with more detail description.

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Flexible Maintenance Scheduling of Generation System by Multi-Probabilistic Reliability Criterion in Korea Power System

  • Park, Jeong-Je;Choi, Jae-Seok;Baek, Ung-Ki;Cha, Jun-Min;Lee, Kwang-Y.
    • Journal of Electrical Engineering and Technology
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    • 제5권1호
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    • pp.8-15
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    • 2010
  • A new technique using a search method which is based on fuzzy multi-criteria function is proposed for GMS(generator maintenance scheduling) in order to consider multi-objective function. Not only minimization of probabilistic production cost but also maximization of system reliability level are considered for fuzzy multi-criteria function. To obtain an optimal solution for generator maintenance scheduling under fuzzy environment, fuzzy multi-criteria relaxation method(fuzzy search method) is used. The practicality and effectiveness of the proposed approach are demonstrated by simulation studies for a real size power system model in Korea in 2010.

생애가사노동가치의 평가모형에 관한 연구 (A Study on the Evaluation Model of the Life-Time Household Work)

  • 김선희
    • 대한가정학회지
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    • 제29권2호
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    • pp.241-248
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    • 1991
  • The aim of this study is to propose the criteria for a evaluation model of the lifetime household work and organize the model. The results were as follows: Three criteria for a evaluation model of the life-time household work were proposed. $\circled1$ An appropriate framework of the evaluation model should be based on the transition of the family life. $\circled2$ The model should include major variables influencing the value of household work of homemaker. $\circled3$ The model should be flexible enough to accommodate various evaluation methods, and should reflect idiosyncracies of different evaluation methods. In view of the criteria stated above, the present study is based on the family life cycle framework. And the age of the last offspring exhibits a consistent major influence in the evaluation based on the household work hours, while the education level of homemakers shows a consistent major influence in the evaluation based on household worker. So as to reflect these two major variables in the family life cycle framework.

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SIMPLE AND EFFECTIVE METHOD TO PREDICT THE OCCUPANT DYNAMIC RESPONSE UNDER SUDDEN IMPULSE LOADS

  • Elmarakbi, A.M.
    • International Journal of Automotive Technology
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    • 제7권7호
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    • pp.769-776
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    • 2006
  • A mathematical model is developed in this paper to define the interaction between the occupant and vehicle passenger compartment and to predict the occupant dynamic response during a sudden impulse load. Two different types of occupants are considered in this study, child and adult occupants. The occupants are considered as lumped masses connected to the child seat and vehicle's body masses by means of restraint systems. In addition, the occupant restraint characteristics of seat belt and airbag are represented by stiffness and damping elements. To obtain the dynamic response of the occupant, the equations of motion of the occupants during vehicle collisions are developed and analytically solved. The occupant's acceleration and relative displacement are used as injury criteria to interpret the results. It is demonstrated from the numerical simulations that the dynamic response and injury criteria are easily captured and analyzed. It is also shown that the mathematical models are flexible, useful in optimization studies and it can be used at initial design stage.

토양오염방지를 위한 지하저장탱크의 관리 방안 연구 (Management Criteria of Underground Strage Tank for Prevention of Soil Contamination)

  • 김준현;한영한
    • 산업기술연구
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    • 제18권
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    • pp.453-460
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    • 1998
  • The purpose of this study was to analyze their status of underground storage tank(UST) facilities and level of soil contamination, and to establish its management criteria. DB program was developed to analyze the correlation between specific characteristic of UST and level of soil contamination. For a suitable management of UST, leakage monitoring and inspection method of UST was investigated. Inspection period was established based on the leakage rate. The most dominant factor for leakage seemed to be caused by the corrosion. Therefore, main factor, construction method and installation year of UST, and corrosion protection system were suggested for optimal protection of UST. Considering the present management status of UST in Korea, inspection and management criteria of UST should be accomplished in term of contamination protection of leakage, and flexible regulation act should be introduced for each specific site.

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퍼지 정수계회법을 이용한 발전기 보수유지계획 수립 수법의개발 (Development of a Method for the Generator Maintenance Scheduling using Fuzzy Integer Programming)

  • 최재석;도대호
    • 한국지능시스템학회논문지
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    • 제7권5호
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    • pp.77-85
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    • 1997
  • 본 연구에서는 발전기 보수유지계획 수립을 위하여 퍼지 다목적함수를 이용한 새로은 방법을 제시한다. 보수유지 지연비용의 최소화의 발전기 공급예비력의 최대화를 퍼지 다목적함수로 삼았다. 퍼지론적인 환경을 갖는 보수유지계획의 최적점을 구하기 위하여 퍼지 다목적 정수계획법을 이용하였다. 본 연구의 중요 특성은 기존의 불확실성을 갖는 크리스프적인 제약조건을 퍼지제약으로 처리함으로써 보다 유연한 해를 구할 수 있다는 점이다. 모델계통에 대한 사례연구를 통하여 이번에 개발한 수법의 효용성을 보였다.

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위험구간용 고규격 강재 방호울타리의 충돌 거동 및 보강 방법 (Impact Performance of High Grade Steel Barrier for Hazardous Area and Strengthening Method)

  • 고만기;김기동
    • 한국강구조학회 논문집
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    • 제13권4호
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    • pp.407-417
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    • 2001
  • 최근 고속도로와 철도가 평행하게 달라는 경우와 같은 특정위험구간에 안정성과 동시에 좋은 시야를 확보하기 위하여 다양한 철제 베리어가 제안되어 설치되고 있다. 그러나 이러한 베리어 중에서 어느 것도 국내의 충돌조건 $14tonf-80km/h-15^{\circ}$ 을 만족시키는지 확실하게 검증된바가 없기 때문에 본 연구에서는 베리어 예비설계에 가장 많이 사용되고 있는 Barrier VII프로그램을 사용하여 이러한 철재 베리어의 충돌거동을 조사하였다. 해석결과 조사된 베리어 모두 필요한 강성을 발현하지 못하였고 유형 C베리어의 강성이 상대적으로 우수하였다. 따라서, 기 시공된 유형 C 가드레일을 보강하기 위한 방안을 실험적으로 검토하였고 지주에 콘크리트를 부분적으로 보강하는 방법이 충돌조건을 효율적으로 만족시킬 수 있음을 확인하였다.

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