In order to reveal the uncertainty in the process of rescuing the accidents over the expressway network, fuzzy programming method is used to establish the rescue resource dispatch model. The model aims to minimize the...
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ISBN:
(纸本)9783642148798
In order to reveal the uncertainty in the process of rescuing the accidents over the expressway network, fuzzy programming method is used to establish the rescue resource dispatch model. The model aims to minimize the fuzzy dispatch decision-making time to reflect the accidents' influence on the upper traffic flow after accidents happen on the fully-closed expressway. fuzzy chance constraint is designed to reflect the relationship between the uncertain requirements of potential accidents and the existing resource allocation. According to the limitation of the traditional algorithm and the complexity of dispatch problems, especially many accidents happening simultaneously and various rescue resources required, the genetic algorithm based on fuzzy simulation is designed to be fit for the model and the optimized dispatch scheme is obtained. The case study of the expressway network in Henan Province is conducted to illustrate that the fuzzy dispatch method can be used to solve the conflicts between shortening the decision-making time and reducing the rescuing economic costs compared with the existing rescue mode, and the optimum rescue resource dispatch decision is made for the command control center.
In this paper, the fuzzy variation coefficients programming is discussed, and the multi-objectives evaluation method is put forward in the supplier relationship management, the major thoughts are: First choosing n dif...
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In this paper, the fuzzy variation coefficients programming is discussed, and the multi-objectives evaluation method is put forward in the supplier relationship management, the major thoughts are: First choosing n different suppliers evaluation criterion to be a ndimensions space, every suppliers information is a point this space, then we can calculate the Euclid distance between these points and the best or worst point. Finally we sort the suppliers by the distance.
With respect to the customer characteristics of little demand, multi-commodity, and dispersed location, a fuzzy programming model is proposed to optimize the design of distribution centers for business-to-consumer (B2...
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With respect to the customer characteristics of little demand, multi-commodity, and dispersed location, a fuzzy programming model is proposed to optimize the design of distribution centers for business-to-consumer (B2C) e-commerce, in which a hierarchical agglomerative clustering method is introduced to classify customers and estimate the unit weight fuzzy delivery cost from distribution centers to customers. Both commodity supplies and customer demands in the whole plan period are treated as fuzzy numbers. The model is nonlinear because of the scale-economy effect. Therefore, it is not easy to obtain the optimal solution with conventional methods. The problem is solved firstly, by converting it into a crisp model, followed by the implementation of a genetic algorithm with particle swarm optimization. The computational results on simulative examples have demonstrated the effectiveness and feasibility of the model and algorithm.
In today's competitive environment as well as the dynamic nature of the business environment, managing in-ventory and financial flows has become more challenging. As inventory and financial flows are interdependen...
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In today's competitive environment as well as the dynamic nature of the business environment, managing in-ventory and financial flows has become more challenging. As inventory and financial flows are interdependent, setting an optimal plan for managing them simultaneously can have a dramatic impact on the company's effi-ciency The literature indicates that previous studies have rarely considered financial considerations in the in-ventory management problem. Thus, this study proposes a multi-objective programming model to optimize the inventory management problem for dairy products. In the model, material substitution is considered in order to assist in managing the inventory value. A fuzzy model is developed to deal with uncertain parameters such as inventory costs, raw milk volume, and the cost of purchasing raw materials. Then, a real-world case study is conducted in the Iranian dairy industry. Additionally, the proposed model is solved using a multi-choice goal programming approach. Further, sensitivity analyses are conducted in order to investigate the impact of critical parameters on the research question. Finally, managerial insights and theoretical implications are discussed. Based on the results, raw milk volume decreases inventory costs, and material substitution decreases inventory value as obsolete materials are used in products.
This paper addresses the strategic and tactical planning of a downstream oil supply chain (DOSC) subject to different sources of uncertainty. This problem is formulated as a mixed-integer linear programming (MILP) mod...
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This paper addresses the strategic and tactical planning of a downstream oil supply chain (DOSC) subject to different sources of uncertainty. This problem is formulated as a mixed-integer linear programming (MILP) model, whereas uncertainty is tackled using chance constrained programming with fuzzy param-eters. The MILP model aims at determining the network design and the products distribution plan in a cost-effective way. A real case study on the Brazilian oil industry is used to validate the model. The pro-posed model shows to be a valuable decision-support tool in order to aid the decision-making process in the strategic and tactical planning of real-life problems. (c) 2021 Elsevier Ltd. All rights reserved.
In this paper, an interactive fuzzy programming method using genetic algorithms has been proposed for two-level 0-1 programming problems with fuzzy parameters. According to the proposed technique, the decision maker i...
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In this paper, an interactive fuzzy programming method using genetic algorithms has been proposed for two-level 0-1 programming problems with fuzzy parameters. According to the proposed technique, the decision maker in each level establishes his fuzzy goals related to the objective functions, using linear membership functions. After that, the upper level decision maker establishes, subjectively, the minimal acceptable degree of the degree of satisfaction for the membership functions and, simultaneously, considers the ratio of satisfaction degrees between the levels;if necessary, the decision maker updates his minimal acceptability degree interactively. In so doing, a satisfactory solution is produced by taking into consideration also the achievement balance of the overall satisfaction degree, while respecting the upper-level decision maker's decision. The feasibility and validity of the proposed method was demonstrated through a numerical example for a two-level 0-1 programming problem with fuzzy parameters. The algorithm proposed in this paper can be extended to multilevel problems. (C) 2000 Scripta Technica.
This paper considers the vehicle routing problem with soft time windows (VRPSTW) where the customers' preferences and tolerances on the latest delivery times are handled by use of a fuzzy programming model. The pr...
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This paper considers the vehicle routing problem with soft time windows (VRPSTW) where the customers' preferences and tolerances on the latest delivery times are handled by use of a fuzzy programming model. The proposed model and the solution approach make easy to trade-off distributors' various strategies between efficiency and responsiveness spectrum. An indirect enumeration strategy is proposed to generate all pseudo-dominant (Pareto) solutions to the VRPSTW. A simulated annealing (SA) algorithm is implemented to solve the test problems. The importance and advantages of the proposed approach are illustrated by numerical results.
Capacity uncertainty is a common issue in the transportation planning field. However, few studies discuss the intermodal routing problem with service capacity uncertainty. Based on our previous study on the intermodal...
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Capacity uncertainty is a common issue in the transportation planning field. However, few studies discuss the intermodal routing problem with service capacity uncertainty. Based on our previous study on the intermodal routing under deterministic capacity consideration, we systematically explore how service capacity uncertainty influences the intermodal routing decision. First of all, we adopt trapezoidal fuzzy numbers to describe the uncertain information of the service capacity, and further transform the deterministic capacity constraint into a fuzzy chance constraint based on fuzzy credibility measure. We then integrate such fuzzy chance constraint into the mixed-integer linear programming (MILP) model proposed in our previous study to develop a fuzzy chance-constrained programming model. To enable the improved model to be effectively programmed in the standard mathematical programming software and solved by exact solution algorithms, a crisp equivalent linear reformulation of the fuzzy chance constraint is generated. Finally, we modify the empirical case presented in our previous study by replacing the deterministic service capacities with trapezoidal fuzzy ones. Using the modified empirical case, we utilize sensitivity analysis and fuzzy simulation to analyze the influence of service capacity uncertainty on the intermodal routing decision, and summarize some interesting insights that are helpful for decision makers.
Narasimhan incorporated fuzzy set theory within goal programming formulation in 1980. Since then numerous research has been carried out in this field. One of the well-known models for solving fuzzy goal programming pr...
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Narasimhan incorporated fuzzy set theory within goal programming formulation in 1980. Since then numerous research has been carried out in this field. One of the well-known models for solving fuzzy goal programming problems was proposed by Hannan in 1981. In this paper the conventional MINMAX approach in goal programming is applied to solve fuzzy goal programming problems. It is proved that the proposed model is an extension to Hannan model that deals with unbalanced triangular linear membership functions. In addition, it is shown that the new model is equivalent to a model proposed in 1991 by Yang et al. Moreover, a weighted model of the new approach is introduced and is compared with Kim and Whang's model presented in 1998. A numerical example is given to demonstrate the validity and strengths of the new models. (c) 2005 Elsevier B.V. All rights reserved.
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