We present a discrete time single-server two-level mixed service polling systems with two queue types, one center queue and N normal queues. Two-level means the center queue will be successive served after each normal...We present a discrete time single-server two-level mixed service polling systems with two queue types, one center queue and N normal queues. Two-level means the center queue will be successive served after each normal queue. In the first level, server visits between the center queue and the normal queue. In the second level, normal queues are polled by a cyclic order. Mixed service means the service discipline are exhaustive for center queue, and parallel 1-limited for normal queues. We propose an imbedded Markov chain framework to drive the closed-form expressions for the mean cycle time, mean queue length, and mean waiting time. Numerical examples demonstrate that theoretical and simulation results are identical the new system efficiently differentiates priorities.展开更多
In this paper,the energy spectrum of the two-photon Jaynes-Cummings model（TPJCM） is calculated exactly in the non-rotating wave approximation（non-RWA）,and we study the level-crossing problem by means of fidelity.A...In this paper,the energy spectrum of the two-photon Jaynes-Cummings model（TPJCM） is calculated exactly in the non-rotating wave approximation（non-RWA）,and we study the level-crossing problem by means of fidelity.A narrow peak of the fidelity is observed at the level-crossing point,which does not appear at the avoided-crossing point.Therefore fidelity is perfectly suited for detecting the level-crossing point in the energy spectrum.展开更多
The symmetry of Y<sub>5μ</sub>-deformed fields are classified and the one-particlespectra in two-level model coupled by Y<sub>5μ</sub> fields are discussed.
In general, a supplier/retailer frequently offer trade credit to stimulate their respective sales. The main purpose of this paper is to investigate the optimal supplier/retailer’s replenishment decisions under two le...In general, a supplier/retailer frequently offer trade credit to stimulate their respective sales. The main purpose of this paper is to investigate the optimal supplier/retailer’s replenishment decisions under two levels of trade credit policy within the economic order quantity (EOQ) framework. This paper deals with the supplier/retailer’s inventory replenishment problem under two levels of trade credit in one replenishment cycle. A different approach of two levels of trade credit is used, which give more freedom to the supplier/retailer in business. In addition, the easy-to-use procedure is developed to efficiently find the optimal cycle time for the retailer under minimizing annual total relevant cost. Finally, a numerical example is given to illustrate these results.展开更多
The reliability and high performance of metadata service is crucial to the store architecture. A novel design of a two-level metadata server file system （TTMFS） is presented, which behaves high reliability and perfo...The reliability and high performance of metadata service is crucial to the store architecture. A novel design of a two-level metadata server file system （TTMFS） is presented, which behaves high reliability and performance. The merits both centralized management and distributed management are considered simultaneously in our design. In this file system, the advanced-metadata server is responsible for manage directory metadata and the whole namespace. The double-metadata server is responsible for maintaining file metadata. And this paper uses the Markov return model to analyze the reliability of the two-level metadata server. The experiment data indicates that the design can provide high throughput.展开更多
A new lattice Boltzmann model for compressible perfect gas is proposed. The numerical example shows that it can be used to simulate shock wave and contact discontinuity. The results are comparable with those obtained ...A new lattice Boltzmann model for compressible perfect gas is proposed. The numerical example shows that it can be used to simulate shock wave and contact discontinuity. The results are comparable with those obtained by traditional methods. The ratio of specific heats gamma may be chosen according to the requirement of problems.展开更多
为研究城市轨道交通分时定价的票价方案和公益性水平评价问题,本文从公益性角度出发,考虑票价和客流量的相互作用关系,以各时段的票价率为决策变量,基于交通方式影响因素和乘客出行选择行为,构建以系统乘客总出行时间最小为目标的双层...为研究城市轨道交通分时定价的票价方案和公益性水平评价问题,本文从公益性角度出发,考虑票价和客流量的相互作用关系,以各时段的票价率为决策变量,基于交通方式影响因素和乘客出行选择行为,构建以系统乘客总出行时间最小为目标的双层规划模型;设计基于嵌套Method of Successive Averages的混合多种群遗传算法的求解方法;采用实际数据标定模型中关键参数,分析比较不同分时定价方案的票价率和公益性水平,提出基于公益性的分时定价方案。研究结果表明:在分时定价策略的效果中,能较明显地提升系统城市轨道交通公益性水平的方案为差别定价(高峰和非高峰票价下限和上限相同)和仅非高峰期降价策略,其中,前者的非高峰期和高峰期票价分别为0.1元·人^(-1)·km^(-1)和0.2元·人^(-1)·km^(-1),相对于原票价方案使总广义费用和总出行时间分别降低12.75%和8.23%;较明显地降低公益性水平的方案为仅高峰期升价策略。展开更多
基金Supported by the National Natural Science Foundation of China (No. 61072079)Science Foundation of Yunnan Provincial Department (No. 2011Y117)
文摘We present a discrete time single-server two-level mixed service polling systems with two queue types, one center queue and N normal queues. Two-level means the center queue will be successive served after each normal queue. In the first level, server visits between the center queue and the normal queue. In the second level, normal queues are polled by a cyclic order. Mixed service means the service discipline are exhaustive for center queue, and parallel 1-limited for normal queues. We propose an imbedded Markov chain framework to drive the closed-form expressions for the mean cycle time, mean queue length, and mean waiting time. Numerical examples demonstrate that theoretical and simulation results are identical the new system efficiently differentiates priorities.
基金Project supported by the National Natural Science Foundation of China (Grant No. 1097602/A06)
文摘In this paper,the energy spectrum of the two-photon Jaynes-Cummings model（TPJCM） is calculated exactly in the non-rotating wave approximation（non-RWA）,and we study the level-crossing problem by means of fidelity.A narrow peak of the fidelity is observed at the level-crossing point,which does not appear at the avoided-crossing point.Therefore fidelity is perfectly suited for detecting the level-crossing point in the energy spectrum.
基金The project partly supported by the National Natural Science Foundation of China.
文摘The symmetry of Y<sub>5μ</sub>-deformed fields are classified and the one-particlespectra in two-level model coupled by Y<sub>5μ</sub> fields are discussed.
文摘In general, a supplier/retailer frequently offer trade credit to stimulate their respective sales. The main purpose of this paper is to investigate the optimal supplier/retailer’s replenishment decisions under two levels of trade credit policy within the economic order quantity (EOQ) framework. This paper deals with the supplier/retailer’s inventory replenishment problem under two levels of trade credit in one replenishment cycle. A different approach of two levels of trade credit is used, which give more freedom to the supplier/retailer in business. In addition, the easy-to-use procedure is developed to efficiently find the optimal cycle time for the retailer under minimizing annual total relevant cost. Finally, a numerical example is given to illustrate these results.
基金Supported by the Industrialized Foundation ofHebei Province (F020501)
文摘The reliability and high performance of metadata service is crucial to the store architecture. A novel design of a two-level metadata server file system （TTMFS） is presented, which behaves high reliability and performance. The merits both centralized management and distributed management are considered simultaneously in our design. In this file system, the advanced-metadata server is responsible for manage directory metadata and the whole namespace. The double-metadata server is responsible for maintaining file metadata. And this paper uses the Markov return model to analyze the reliability of the two-level metadata server. The experiment data indicates that the design can provide high throughput.
基金The project supported by the National Natural Science Foundation of China
文摘A new lattice Boltzmann model for compressible perfect gas is proposed. The numerical example shows that it can be used to simulate shock wave and contact discontinuity. The results are comparable with those obtained by traditional methods. The ratio of specific heats gamma may be chosen according to the requirement of problems.
文摘为研究城市轨道交通分时定价的票价方案和公益性水平评价问题,本文从公益性角度出发,考虑票价和客流量的相互作用关系,以各时段的票价率为决策变量,基于交通方式影响因素和乘客出行选择行为,构建以系统乘客总出行时间最小为目标的双层规划模型;设计基于嵌套Method of Successive Averages的混合多种群遗传算法的求解方法;采用实际数据标定模型中关键参数,分析比较不同分时定价方案的票价率和公益性水平,提出基于公益性的分时定价方案。研究结果表明:在分时定价策略的效果中,能较明显地提升系统城市轨道交通公益性水平的方案为差别定价(高峰和非高峰票价下限和上限相同)和仅非高峰期降价策略,其中,前者的非高峰期和高峰期票价分别为0.1元·人^(-1)·km^(-1)和0.2元·人^(-1)·km^(-1),相对于原票价方案使总广义费用和总出行时间分别降低12.75%和8.23%;较明显地降低公益性水平的方案为仅高峰期升价策略。
