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基于供应链风险和供应链绩效的模糊性和供应商选择问题的动态性,本文考虑供应链风险和供应链绩效作为模糊变量,讨论如何给生产商一个满意的动态多目标供应商选择方案,确定供应链风险和总成本最小,以及供应链绩效最大。然后对该问题提出了一个动态多目标多产品供应商选择模型,该模型是首次同时考虑供应商选择,订单分配,供应链风险和供应链绩效的一个模糊动态非线性多目标规划模型。为了去模糊化和求解该模型,给出了一个风险和绩效的模糊评估法。最后给出一个数值算例验证了该模型的可行性,为决策者选择供应商提供了理论依据。 相似文献
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我们研究了在非线性光子晶体中嵌有施主和受主量子点中探测场的吸收特性。研究发现,通过适当调节相关参数可以有效地控制探测光场的吸收。在考虑偶-偶相互作用下,我们发现了很多有趣的现象。我们的方案为通过非相干泵浦场来控制复合纳米系统中弱探测场的吸收提供了可能性。 相似文献
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<正>The problem of bound polarons in quantum dot quantum well(QDQW) structures is studied theoretically.The eigenfrequencies of bulk longitudinal optical(LO) and surface optical(SO) modes are derived in the framework of the dielectric continuum approximation.The electron-phonon interaction Hamiltonian for QDQW structures is obtained and the exchange interaction between impurity and LO-phonons is discussed.The binding energy and the trapping energy of the bound polaron in CdS/HgS QDQW structures are calculated.The numerical results reveal that there exist three branches of eigenfrequencies of surface optical vibration in the CdS/HgS QDQW structure.It is also shown that the binding energy and the trapping energy increase as the inner radius of the QDQW structure decreases,with the outer radius fixed,and the trapping energy takes a major part of the binding energy when the inner radius is very small. 相似文献
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Optical bistability and multistability in a three-level Δ-type atomic system under the nonresonant condition 下载免费PDF全文
Under a nonresonant condition,we theoretically investigate hybrid absorptive-dispersive optical bistability and multistability behaviours in a three-level △-type system by using a microwave field to drive a hyperfine transition between two upper excited states inside a unidirectional ring cavity.We find that the optical bistability and multistability behaviours can be controlled by adjusting the intensity of the microwave field or the intensity of the coherent coupling field.Furthermore,our studies show an interesting phenomenon of the transition from the optical bistability to the optical multistability only by changing the negative detuning of the coupling field into the positive detuning of the coupling field. 相似文献
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通过运用四阶段DEA的方法,首先分析环境变量对各地区技术效率的影响,并得到过滤掉环境因素影响的技术效率;再运用Bootstrap技术,得到各地区纠偏后的技术效率.结果分析表明:可节约劳动的调整对东中部地区效率变动产生较大的影响,资本调整仅起次要作用;可节约资本与劳动的调整对西部地区效率变动都产生重要影响.环境变量的作用表现为:民营资本、基础设施、产业升级、FDI等因素对提升地区技术效率起重要作用. 相似文献
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