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在时变需求环境下,基于模型推导得到供需双方基本库存水平局部优化与整体优化决策方程,并基于算例对基本库存水平整体优化的成本绩效以及需求时变性的影响进行数据分析,得到如下重要结论:基本库存水平整体优化明显降低供应链库存成本. 相似文献
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对当代大学生就业问题的理性思考 总被引:15,自引:3,他引:15
梅清华 《东华理工学院学报》2004,23(1):80-83
当前毕业生存在的就业问题,究竟是“人才过剩”,还是有其它制约因素?文章分析了较为严峻的就业形势和较为普遍的“有业不就”的现状,提出了转变观念,摆正心态,调整结构,对接需求,畅通渠道,完善体制的理性思考。 相似文献
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流动性约束与消费行为关系的实证研究 总被引:2,自引:1,他引:2
流动性约束是指资本市场的资金流动具有单向性,流动性约束的存在可以提高储蓄水
平,降低当期累积消费. 通过三阶段生命期界的最优消费模型,证明了流动性约束的定量存在,
并通过实证检验发现,我国消费总量中受流动性约束影响的比例达到83. 46 %. 因此,增强信
贷市场的流动性,对于扩张有效需求将起重要作用. 相似文献
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Tolerance of Uncertainty: Links to Happenstance,Career Decision Self‐Efficacy,and Career Satisfaction 下载免费PDF全文
Boyoung Kim Eunjeong Rhee Gyuyoung Ha Joonyoung Yang Sang Min Lee 《The Career development quarterly》2016,64(2):140-152
This study investigated the extent to which tolerance of uncertainty affects the relationship between happenstance skills and career satisfaction via career decision self‐efficacy. Moderated mediation analysis was conducted on data collected from 321 graduates (175 men, 146 women) of Korean universities making the school‐to‐work transition. Results showed that career decision self‐efficacy fully mediated the relationship between happenstance skills and career satisfaction. Furthermore, the moderation effect of tolerance of uncertainty had a significant impact on the relationship between happenstance skills and career decision self‐efficacy. Tolerance of uncertainty should be considered an important variable in happenstance career theory and intervention. Unplanned influences should also be considered important factors in the career decision‐making process. 相似文献
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《Omega》2017
The more customer demand is impulse-driven, the more it is space-dependent and the more it is subject to variation. We investigate the corresponding problem of retail shelf-space planning when demand is stochastic and sensitive to the number and position of facings. We develop a model to maximize a retailer׳s profit by selecting the number of facings and their shelf position under the assumption of limited space. The model is particularly applicable to promotional or temporary products.We develop the first optimization model and solution approach that takes stochastic demand into account, since the current literature applies deterministic models for shelf-space planning. By the means of an innovative modeling approach for the case with space- and positioning effects and the conversion of our problem into a mixed-integer problem, we obtain optimal results within very short run times for large-scale instances relevant in practice. Furthermore, we develop a solution approach to account for cross-space elasticity, and solve it using an own heuristic, which efficiently yields near-optimal results. We demonstrate that correctly considering space elasticity and demand variation is essential. The corresponding impacts on profits and solution structures become even more significant when space elasticity and stochastic demand interact, resulting in up to 5% higher profits and up to 80% differences in solution structures, if both effects are correctly accounted for. We develop an efficient modeling approach, compare the model results with approaches applied in practice and derive rules-of-thumb for planners. 相似文献
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《Omega》2014
We consider a supply chain consisting of a single supplier and a single retailer with stochastic customer demand, which is operated over an infinite horizon. We propose a delay-in-payment contract to coordinate the supply chain. With this contract, the supplier allows the retailer to pay partial order cost at the ordering epoch, and to pay the remaining portion after a permissible number of periods. The system is formulated as a stochastic dynamic programming problem. It is shown that there exists a base-stock policy to be optimal. Compared with the traditional wholesale-price contract, the delay-in-payment contract with appropriate parameters can achieve a Pareto improvement (i.e., the performances of both the supplier and the retailer using the delay-in-payment contract are better than those using the wholesale-price contract). Numerical studies are performed to investigate both the effectiveness of the Pareto improvement, and the impact of the major parameters of the delay-in-payment contract on the system performance. 相似文献