• 제목/요약/키워드: Sub-Package problem

검색결과 15건 처리시간 0.03초

BASIC RESEARCH OF SUB-PACKAGE PROBLEM IN KOREAN CONSTRUCTION INDUSTRY

  • Jinho Shin;Furusaka Shuzo
    • 국제학술발표논문집
    • /
    • The 3th International Conference on Construction Engineering and Project Management
    • /
    • pp.635-641
    • /
    • 2009
  • In the building construction, the specialist contractors play the important roles in the point of the quality securing. Therefore, it is very important for the construction industry to study the sub-package problem. The sub-package problem includes two problems which should be solved. One is to decide the scope of works of each specialist contractor, and another one is to decide the particular specialist contractor which carries out the work. However, the sub-package problem in Korea is not clarified yet, although the circumstance around it has changed rapidly. Many factors influence to the sub-package problem regardless of internal factors or external factors of the project. The general contractor usually decides the sub-package under considering the project conditions. In case of the internal factors, each general contractor manages the organization and materials. But the external factors are relatively more difficult to control and predict than internal ones. But out of the external factors, the legal system has very close relationship with a sub-package problem especially in Korean construction system. So, this paper clarifies relationship between the legal system relating subcontracting and the state of sub-package.

  • PDF

a hybrid approach for jobshop scheduling with lot-streaming

  • 김인수;서윤호
    • 한국품질경영학회:학술대회논문집
    • /
    • 한국품질경영학회 2007년도 춘계학술대회
    • /
    • pp.491-497
    • /
    • 2007
  • The planning and scheduling is considered as an important function because it influence to the overall performance of production in manufacturing system for supporting global objectives. In this paper, propose the hybrid approach to solve the problem which considered alternative resources and sequences, a sequence-dependent setups and transportation times. The objective of this problem is minimize the makespan with AGV traveling time. A iterative two heuristic algorithm(PSO, SA) is proposed to obtain the sequence of operations and CPLEX package is used to obtain the optimal sub-lot sizes(OLS) when the sequence of operations and greedy-based AGV dispatching rules are fixed or given. we show that performance of iterative two heuristic algorithms and simple numerical experiment.

  • PDF

A novel approach for the design of multi-class reentrant manufacturing systems

  • Yoo, Dong-Joon;Jung, Jae-Hak;Lee, In-Beum;Lee, Euy-Soo;Yi, Gyeong-beom
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 제어로봇시스템학회 2004년도 ICCAS
    • /
    • pp.710-715
    • /
    • 2004
  • The design problem of manufacturing system is addressed, adopting the closed queueing network model with multiple loops and re-entrant flows. The entire design problem is divided into two hierarchical sub-problems of (1) determining the station configuration and (2) optimizing the lot constitution; then they are tackled by neighbor search algorithm (NSA) and greedy mean value analysis (GMVA), respectively. Unlike the conventional MVA concerning multi-class closed queueing networks, the GMVA doesn't stick to a fixed lot proportion; rather it tries to find the optimal balance. The NSA, on the other hand, improves the object function value by altering the station configuration successively with its superior neighbor. The moderate time complexity, presented in big-${o}$ notation, enables us to apply the method even to the large-size practical cases, and the CPU time of an enlarged problem can be approximated by the same equation. The validity of our analytic approach is backed up by simulation studies with a widespread simulation package.

  • PDF

공급사슬상의 분산 제조 시스템의 통합생산계획에 관한 연구 (A Study on Integrated Production Planning of Distributed Manufacturing Systems on Supply Chain)

  • 고도성;양영철;장양자;박진우
    • 산업공학
    • /
    • 제13권3호
    • /
    • pp.378-387
    • /
    • 2000
  • As the globalization of manufacturing companies continues, the scope of dependence between these companies and distributors, and other suppliers are growing very rapidly since no one company manufactures or distributes the whole product by themselves. And, the need to increase the efficiency of the whole supply chain is increasing. This paper deals with a multi-plant lot-sizing problem(MPLSP) which happens in a decentralized manufacturing system of a supply chain. In this study, we assume that the whole supply chain is driven by a single source of independent demand and many levels of dependent demands among manufacturing systems in the supply chain. We consider setup cost, transportation cost and time, and inventory holding cost as a decision factor in the MPLSP. The MPLSP is decomposed into two sub-problems: a planning problem of the whole supply chain and a lot-sizing problem of each manufacturing system. The supply chain planning problem becomes a pure linear programming problem and a Generalized Goal Decomposition method is used to solve the problem. Its result is used as a goal of the lot-sizing problem. The lot-sizing problem is solved using the CPLEX package, and then the coefficients of the planning problem are updated reflecting the lot-sizing solution. This procedure is repeated until termination criteria are met. The whole solution process is similar to Lagrangian relaxation method in the sense that the solutions are approaching the optimum in a recursive manner. Through experiments, the proposed closed-loop hierarchical planning and traditional hierarchical planning are compared to optimal solution, and it is shown that the proposed method is a very viable alternative for solving production planning problems of decentralized manufacturing systems and in other areas.

  • PDF

Buckling of fully and partially embedded non-prismatic columns using differential quadrature and differential transformation methods

  • Rajasekaran, S.
    • Structural Engineering and Mechanics
    • /
    • 제28권2호
    • /
    • pp.221-238
    • /
    • 2008
  • Numerical solution to buckling analysis of beams and columns are obtained by the method of differential quadrature (DQ) and harmonic differential quadrature (HDQ) for various support conditions considering the variation of flexural rigidity. The solution technique is applied to find the buckling load of fully or partially embedded columns such as piles. A simple semi- inverse method of DQ or HDQ is proposed for determining the flexural rigidities at various sections of non-prismatic column ( pile) partially and fully embedded given the buckling load, buckled shape and sub-grade reaction of the soil. The obtained results are compared with the existing solutions available from other numerical methods and analytical results. In addition, this paper also uses a recently developed technique, known as the differential transformation (DT) to determine the critical buckling load of fully or partially supported heavy prismatic piles as well as fully supported non-prismatic piles. In solving the problem, governing differential equation is converted to algebraic equations using differential transformation methods (DT) which must be solved together with applied boundary conditions. The symbolic programming package, Mathematica is ideally suitable to solve such recursive equations by considering fairly large number of terms.

ESPI를 이용한 전자제품 패키지 열변형 신뢰성 평가에 관한 연구 (A Study on the Reliability Evaluation of Thermal Deformation of Electronic Product Package by ESPI)

  • 조지현;이재혁;박상영;장중순;김광섭
    • 한국신뢰성학회지:신뢰성응용연구
    • /
    • 제5권4호
    • /
    • pp.439-450
    • /
    • 2005
  • Thermal deformation of Digital Television effect friction noise directly. However there was no methods to find and to solve the thermal friction noise which is huge problem in Digital Television In this study, to figure out occurrence cause of friction noise of the product, we measured thermal deformation of the product to organize a triggering device united with Laser Doppler Vibrometer(LDV) which turned occurrence moment of thermal friction noise into a possibility to measure. In conclusion, we could offer an effective information of design, and ensured ESPI(Electronic Speckle Pattern Interferometry) measure technique which is more detailed than the past way.

  • PDF

다운증후군 자녀를 둔 가족의 적응력: 혼합적 연구 방법 적용 (Adaptation in Families of Children with Down Syndrome: A Mixed-methods Design)

  • 최현경
    • 대한간호학회지
    • /
    • 제45권4호
    • /
    • pp.501-512
    • /
    • 2015
  • Purpose: The purpose of this study, which was guided by the Resiliency Model of Family Stress, Adjustment, and Adaptation, was twofold: (a) to explore family and parental adaptation and factors influencing family adaptation in Korean families of children with Down syndrome (DS) through a quantitative methodology and (b) to understand the life with a Korean child with DS through a qualitative method. Methods: A mixed-methods design was adopted. A total of 147 parents of children with DS completed a package of questionnaires, and 19 parents participated in the in-depth interviews. Quantitative and qualitative data were analyzed using stepwise multiple regression and content analysis respectively. Results: According to the quantitative data, the overall family adaptation scores indicated average family functioning. Financial status was an important variable in understanding both family and parental adaptation. Family adaptation was best explained by family problem solving and coping communication, condition management ability, and family hardiness. Family strains and family hardiness were the family factors with the most influence on parental adaption. Qualitative data analysis showed that family life with a child with DS encompassed both positive and negative aspects and was expressed with 5 themes, 10 categories, and 16 sub-categories. Conclusion: Results of this study expand our limited knowledge and understanding concerning families of children with DS in Korea and can be used to develop effective interventions to improve the adaptation of family as a unit as well as parental adaptation.

차세대 고속열차 도입에 따른 수단분담모형 개발 및 적용방안 (Development of Mode Choice Model for the Implementation of Next-generation High Speed Train(HEMU-430X))

  • 이광섭;정성봉;엄진기;남궁백규;김석원
    • 대한교통학회지
    • /
    • 제33권5호
    • /
    • pp.461-469
    • /
    • 2015
  • 최근 차세대 고속열차에 대한 기술적 검토가 마무리됨에 따라, 실용화 방안에 대한 연구가 본격적으로 진행되고 있다. 차세대 고속열차를 도입하기 위해서는 수요예측을 통한 타당성 분석이 선행되어야 한다. 이에 본 연구에서는 차세대 고속열차 운행특성을 고려한 적정 수단분담모형을 개발하는 것을 목적으로 하고 있다. 즉, 차세대 고속열차의 경우 기존 고속열차와의 관계에 따라 다항로짓모형과 네스티드로짓모형 중 적절한 모형을 선택하는 과정이 필요하다. 수단분담모형 구축을 위해 지역 간 통행자의 통행행태 조사를 통해 현재 및 장래 수단선호도 조사를 실시하였다. 통행시간과 통행비용으로 구성된 효용함수를 추정하기 위하여 Limdep 8.0 NLOGIT 3.0 package를 이용하여 다항로짓모형과 네스티드로짓모형을 개발하였다. 구축된 각 모형의 경우 통계적 유의성은 어느 정도 확보되는 것으로 나타났다. 다만, IIA TEST에서 IV Parameter가 약 0.521로 0과 1사이에 위치하여, 향후 모형적용 시 네스티드로짓모형이 적합한 것으로 분석되었다. 또한, 차세대 고속열차가 도입될 경우 모형의 적용과정에서 국가교통DB의 수정보완 필요성과 적용방안을 제시함으로써, 합리적인 수요분석을 위한 토대를 마련하는데 기여를 할 것으로 기대된다.

외모도구성 하위차원에 따른 외모지향도, 외모관련 소비행동 연구 (Study on the Appearance-oriented, Appearance-Related Consumption Behavior according to sub-variables of Appearance Instrumentality)

  • 이현옥;구양숙
    • 한국의류산업학회지
    • /
    • 제20권4호
    • /
    • pp.400-409
    • /
    • 2018
  • The purpose of this study was to identify the appearance-oriented, appearance-related consumption behavior according to appearance instrumentality. Questionnaires were administered to 460 males and females of 20 to 30 living in Daegu. The SPSS 20.0 package was utilized for data analysis which included frequency analysis, factor analysis, cronbach's ${\alpha}$, t-test, regression analysis. Three factors of appearance instrumentality (social achievement, sexual attractiveness, social relationship formation), two factors of appearance-oriented and five factors of appearance-related consumption behavior were utilized for the problem analysis of the study. The results of this study were: First, there was significant differences in the appearance coordination oriented and appearance management oriented according to group of social achievement (high, low) and group of sexual attractiveness (high, low). But social relationship formation(high, low) had not significant differences in appearance oriented. Second, group of social achievement (high, low) were significant differences in cosmetic surgery behavior and fashion behavior, group of sexual attractiveness (high, low) showed a significant differences in cosmetic surgery behavior, hair management behavior and fashion behavior. But group of social relationship formation (high, low) had not significant differences on all of appearance management behavior. Third, appearance coordination oriented was a influences on beauty management behavior, cosmetic surgery behavior, hair style management behavior, fashion behavior. And appearance management oriented was influences on body management behavior, hair style management behavior, fashion behavior.

Breast Cancer Knowledge, Perception and Breast Self-Examination Practices among Yemeni Women: an Application of the Health Belief Model

  • Al-Sakkaf, Khaled Abdulla;Basaleem, Huda Omer
    • Asian Pacific Journal of Cancer Prevention
    • /
    • 제17권3호
    • /
    • pp.1463-1467
    • /
    • 2016
  • Background: The incidence of breast cancer is rapidly increasing in Yemen with recent indications of constituting one-third of female cancers. The main problem in Yemen remains very late presentation of breast cancer, most of which should have been easily recognisable. Since stage of disease at diagnosis is the most important prognostic variable, early diagnosis is an important option to be considered for control of breast cancer in low resourced settings like Yemen. In the present study, we aimed at describing breast cancer knowledge, perceptions and breast self-examination (BSE) practices among a sample of Yemeni women. Materials and Methods: This cross-sectional study covered 400 women attending four reproductive health centres in Aden, Yemen through face-to-face interview using a structured questionnaire during April - July 2014. We collected data on sociodemographic characteristics, knowledge about breast cancer, and screening practices as well as respondents' perceptions based on the five sub scales of the Health Belief Model (HBM): perceived susceptibility; perceived severity; perceived barriers; perceived benefits; and self-efficacy. The response format was a five-point Likert scale. Statistical Package for Social Sciences (SPSS 20) was used for statistical analysis. Statistical significance was set at p<0.05. Logistic regression analysis was conducted with BSE as a dependent variable. Results: The mean age of women was 26.5 (S.D=5.6) years. The majority (89.0%) had never ever performed any screening. Two-thirds of respondents had poor knowledge. Perceived BSE benefits and self-efficacy and lower BSE barriers perception were significant independent predictors of BSE practice. Conclusions: Poor knowledge and inadequate BSE practices are prevailing in Yemen. The need for implementing culturally sensitive targeted education measures is mandatory in the effort to improve early detection and reduce the burden of breast cancer.