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81.
《Operations Research Letters》2021,49(5):650-654
In this paper, we study the busy-period distribution for discrete-time queues assuming a Bernoulli arrival process, with arbitrary service-time and batch-arrival distributions. We derive explicit analytic formulas for these distributions using the Lagrange Implicit Function Theorem applied to probability generating functions. The convenient coefficient operator notation used in these formulas leads to a computationally efficient method for obtaining the distributions in their entirety from these analytic formulas. 相似文献
82.
In this paper,we study the local bifurcation of critical periods near the nondegenerate center(the origin) of a class of Liénard equations with degree 2n,and prove that at most 2n-2 critical periods(taken into account multiplicity) can be produced from a weak center of finite order.We also prove that it can have exactly2n-2 critical periods near the origin. 相似文献
83.
A fundamental assumption in traditional inventory models is that all of the ordered items are of perfect quality. A two-level supply chain is considered consists of one retailer and a collection of suppliers that operate within a finite planning horizon, including multiple periods, and a model is formulated that simultaneously determines both supplier selection and inventory allocation problems in the supply chain. It is supposed that the ordered products dependent on the suppliers include a certain percentage of imperfect quality products and have different prices. In this paper, we study the impact of the retailer’s financial constraint. On the other hand, suppliers have restricted capacities and set minimum order quantity (MOQ) policy for the retailer’s order amount happened in each period. So, the problem is modeled as a mixed integer nonlinear programming. The purpose of this model is to maximize the total profit. The nutrients, fishery and fruitage industries give good examples for the proposed model. A numerical example is presented to indicate the efficiency of the proposed model. Considering the complexity of the model, a genetic algorithm (GA) is presented to solve the model. We demonstrate analytically that the proposed genetic algorithm is suitable in the feasible situations. 相似文献
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聚乙二醇对振荡反应的影响 总被引:11,自引:1,他引:11
前文[1]曾指出,生物体系的化学振荡反应实际上是产生于水溶胶之中(包括高分子溶液及表面活性剂溶液).作为反应介质,水溶胶对生物体系的周期现象有着不可忽略的重要作用.因此,要模拟生物体系的化学振荡就不能不考虑溶胶对振荡反应的影响.前文[2,3]报道了表面活性剂TritonX-100(简称TX-100),TritonX-305等对振荡反应的影响.为了解聚乙二醇类表面活性剂中EO链的作用及高分子溶液对振荡反应的特征影响,我们选用高分子聚乙二醇(PEG)作为添加剂,考虑由于它的加入而引起振荡反应的变化.为了减少PEG中自由羟基的还原… 相似文献
87.
In a recent paper, Soni and Shah [Soni, H., Shah, N. H. (2008). Optimal ordering policy for stock-dependent demand under progressive payment scheme. European Journal of Operational Research 184(1), 91–100] developed a model to find the optimal ordering policy for a retailer with stock-dependent demand and a supplier offering a progressive payment scheme to the retailer. This note corrects some errors in the formulation of the model of Soni and Shah. It also extends their work by assuming that the credit interest rate of the retailer may exceed the interest rate charged by the supplier. Numerical examples illustrate the benefits of these modifications. 相似文献
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Jaume Llibre 《Journal of Difference Equations and Applications》2013,19(12):2059-2068
We study the set of minimal periods of holomorphic self-maps of one- and two-dimensional complex tori. In particular, we characterize when the set of minimal periods of such maps is finite. In fact, we have an algorithm for doing this characterization for holomorphic self-maps of an arbitrary dimensional complex torus. 相似文献