共查询到20条相似文献，搜索用时 203 毫秒
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供应商是供应链的源头,对于整个链条起着非常重要的作用,特别是低碳供应链,选择合适的供应商可以有效控制整个供应链上的碳排放。但是实际情况复杂多变,往往会出现模糊需求、采购多种产品以及多个供应商的情况。同时考虑以上几种情况及碳排放因素并提出一种集成方法,即:第一阶段利用模糊逼近于理想值的排序方法 (FTOPSIS)计算每个供应商提供不同产品的价值;第二阶段把第一阶段所得到价值作为其中一个目标放入模糊多目标规划中确定最优订购量。最后,运用一个实例验证了模型的科学实用性。 相似文献
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供应链内各企业的协调问题是供应链管理的核心问题。针对一个由供应商--制造商--零售商构成的三层供应链,在考虑市场需求为模糊变量的情况下,通过不确定理论分别建立了基于可信度分布的集成供应链模型和收益共享契约模型,并求出最优策略,进而验证结果的正确性。结果表明,零售商以及制造商的最优订购量在模糊需求中心点的左、右浮动。此外,不同的收益分配系数对应不同的批发价格策略;通过选取适当的收益分配系数可以实现供应链各成员之间的完美协调。 相似文献
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模糊聚类的最优化算法 总被引：1，自引：0，他引：1
求与一个模糊相似矩阵“距离”最近的模糊等价矩阵，至今已提出了两个求局部最优解的算法和一些启发式算法，本文也提出一个简便可行的求局部最优解的算法，这算法与线性规划的单纯形算法一样，也是在有限个“顶点”上寻优。 相似文献
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提出一种基于模糊模拟的R&D项目多准则选择方法,将企业的R&D项目选择决策过程分为战略和战术两个阶段,分别采用模糊优选模型和模糊多准则评价模型对项目进行选择,以确定符合企业发展战略的最优R&D项目. 相似文献
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提出一种基于模糊模拟的R＆D项目多准则选择方法，将企业的R＆D项目选择决策过程分为战略和战术两个阶段，分别采用模糊优选模型和模糊多准则评价模型对项目进行选择，以确定符合企业发展战略的最优R＆D项目。 相似文献
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现代家庭最优组合投资模型与模糊策略 总被引：1，自引：1，他引：0
本文深入分析了现代家庭组合投资的渠道,建立了最优组合投资模型,运用模糊策略对期望收益率和风险进行确定,对期望较高收益率和较小风险的家庭组合投资具有一定的实用价值。 相似文献
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针对指标评价值以语言变量给出的员工绩效评估模型,提出了一种基于三角模糊数的多属性决策法.首先将语义变量转化为三角模糊数,然后利用三角模糊数降模糊法将决策矩阵转化为清晰数决策矩阵,并利用变异系数法确定评价指标的权重,最后通过计算综合绩效指标评价值对各员工的绩效进行评价.文末以一所大学行政人员的工作绩效评价为例说明本文所提出的方法的有效性和可行性. 相似文献
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基于模糊线性规划模型的水-土-作物系统优化配置研究 总被引：1，自引：0，他引：1
为了进一步对陕西省蒲东灌区农业的规划发展,本文将线性规划模型和模糊优化模型应用到灌区土地-水-作物系统的规划和管理之中。该模型用于优化经济效益、作物产量和劳动力的利用,并寻求相关作物种植模式和对土地,水,肥和劳动力利用下农业系统的优化配置。根据研究区域情况,决定采用线性规划模型的三个目标函数输出数据作为模糊规划模型的约束条件,在模糊目标和模糊约束的模糊环境下,取得模糊优化模型的最优解方案。这些非结构化的模型能够很好的将地表水资源和地下水资源有效地联合利用。此外,对灌区农业系统优化配置后的净效益进行了对比评价。结果表明,本文提出的多目标模糊线性规划管理模型应用到农业系统土地-水-作物的优化配置中是可行的,合理地分配土地和水资源,提高了作物产量和净效益。 相似文献
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《Journal of The Franklin Institute》2022,359(5):1925-1970
The theory of optimal control plays an important role to solve several real-life problems. However, it is often seen that uncertainty is a major challenge in formulating the appropriate model corresponding to real world problems. To overcome this challenge, in this work, the theory of optimal control is developed in interval environment. Accordingly, the necessary and sufficient optimality conditions for the existence of maximizer of interval valued optimal control problem (IVOCP) are proposed. To validate the proposed theory, an imperfect production inventory model is developed in both crisp and interval environments in which customers’ demand is dependent on the selling price, specific absorption rate (SAR) of products and continuous time. In the proposed model, the production rate is considered as a function of time. In addition, manufacturer invests to reduce the carbon emission and to increase the environmental sustainability of the produced items. As the production rate is taken as a function of time, optimal control theory is used to study the optimal policy of the corresponding problem. To solve the optimal control problem for the proposed model in interval environment, sufficient optimality conditions of IVOCP are used. Thereafter, two numerical examples are considered and solved with the help of different meta-heuristic algorithms. Finally, to observe the impact of various system parameters to the optimal policy of the system, sensitivity analyses are carried out for the example in interval environment and impacts are shown graphically. 相似文献
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《The Journal of High Technology Management Research》2014,25(2):148-162
In today's era of globalization, periodically new products with better value and added features are introduced into the market. The rapid technological breakthroughs are creating significant risks of obsolescence at the product level. It creates enormous challenges to coordinate between technology management and inventory control policies. Due to the dynamic nature of the market, it becomes essential to integrate technological substitution along with diffusion of new products while formulating economic ordering policies for technological products. The literature of estimating and forecasting innovation diffusion patterns for technology product is fairly rich. In recent years these models were applied extensively to derive economic order policies under different economic situations. Unfortunately study on impact of technology substitution on economic order policies is still scarce. The proposed model acknowledged the relationship between substitution rates of product categories and the inventory policies. In this paper an attempt has been made to generate economic inventory policies for technology products under the condition of its diminishing demand. The model is based on the assumption that technological advancements do not essentially imply that existing generation products will be withdrawn from the market immediately. The results are very encouraging and the findings are consistent with the idea that optimal EOQ policies are highly receptive towards the dynamics of the product substitutions and hence it is imperative to identify the trend. A simple solution procedure in the form of algorithm is presented to determine the optimal cycle time and optimal order quantity using the cost function. 相似文献
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High quality summary is the target and challenge for any automatic text summarization. In this paper, we introduce a different hybrid model for automatic text summarization problem. We exploit strengths of different techniques in building our model: we use diversity-based method to filter similar sentences and select the most diverse ones, differentiate between the more important and less important features using the swarm-based method and use fuzzy logic to make the risks, uncertainty, ambiguity and imprecise values of the text features weights flexibly tolerated. The diversity-based method focuses to reduce redundancy problems and the other two techniques concentrate on the scoring mechanism of the sentences. We presented the proposed model in two forms. In the first form of the model, diversity measures dominate the behavior of the model. In the second form, the diversity constraint is no longer imposed on the model behavior. That means the diversity-based method works same as fuzzy swarm-based method. The results showed that the proposed model in the second form performs better than the first form, the swarm model, the fuzzy swarm method and the benchmark methods. Over results show that combination of diversity measures, swarm techniques and fuzzy logic can generate good summary containing the most important parts in the document. 相似文献