初中学生的“时间商”

对于缺乏自律、约束力的初中生来说,不懂如何利用时间,也不懂如何去管理自己的时间,因此要培养他们的时间商,从寻找最本己的生命状态中提高管理时间的自律性.

基于PSO-GA混合算法时间优化的旅行商问题研究

为了给游客提供更好的路径推送服务,针对经典的TSP进行了延伸研究,提出了一种时间优化的旅行商问题(time optimal TSP,TOTSP),旨在寻找一条旅行时间最短的游览路径推送给游客来节省游客的旅行时间。通过混合粒子群遗传算法(PSO-GA)对提出的问题进行仿真实验,并将旅行时间作为PSO-GA的目标函数,其中的旅行时间包括游客在景点之间行走的时间、游客在每个景点排队等待的时间以及游客在每个景点游玩需要的时间三个部分。仿真实验对比了PSO-GA求出的最短旅行时间和所需的CPU执行时间与遗传算法(GA)、蚁群算法(ACO)求出的结果。仿真实验表明,PSO-GA在解决TOTSP上有较好的性能。

对变分原理中时间微商类型的分析

将变分原理中时间微商划分三种类型,回答了梅凤翔在对称性研究中提出的问题;解释了分析力学中两种算子对易关系之间的区别.

基于SFLA-GA混合算法求解时间最优的旅行商问题

该文以经典的对称旅行商问题(Symmetric Traveling Salesman Problem,STSP)为基础,求解时间最优的旅行商问题(Time Optimal TSP,TOTSP),将拟合函数引入到混合蛙跳遗传算法(SFLA-GA)的适应度函数来反映景点客流量随时间的变化,旨在旅游旺季为游客提供一条游览时间最短的路径推送服务。实验结果表明:相对于随机游览路径,SFLA-GA混合算法得到的游览路径明显节省了游览时间;与SFLA和混合粒子群遗传算法(PSO-GA)相比较,SFLA-GA混合算法具有计算量少、收敛速度快、对初始种群依赖性低以及全局性更好等优点,在求解TOTSP上搜索性能更强、时间更优。

基于深度强化学习的方法求解带时间窗的旅行商问题

带时间窗的旅行商问题(traveling salesman problem with time window, TSPTW)是旅行商问题的一个变种,在物资配送等方面有大量的应用。传统方法的求解时间较长且泛化性较差,为提高TSPTW的求解效率,将求解过程建模为马尔科夫决策过程,定义了状态、动作、奖励,提出了一种基于深度强化学习的Transformer加指针网络的组合模型,通过多头注意力对输入的特征进行编码,采用指针网络求出解的概率分布,所提深度学习网络通过强化学习算法进行训练。实验结果表明:所提方法对比传统的启发式求解算法,可以得到更高质量的解,相较于求解器和启发式算法,有超过数10倍的提升效果,且易于将模型拓展到不同规模的问题上。

基于磁场描述的TSPTW问题模型及其蚁群优化算法

针对带有时间窗限制的旅行商问题(travelling salesman problem with time windows,TSPTW)提出了一种基于磁场模型的蚁群变异算法(MFM-ACOMF).它通过修正传统蚁群算法的启发函数,满足用户的时间需求,并降低算法陷入局部最优的可能性;在得到最终解后,通过变异策略对未达到时间窗标准的顾客节点进行优化.仿真实验结果表明:MFM-ACOMF算法与传统ACOM算法相比,在最优解质量和顾客满意率方面都有一定程度的提高.

动态搜索算法求解时间依赖型旅行商问题研究

时间依赖型旅行商问题(TDTSP)是旅行商问题(TSP)的延伸.在该问题中,任意两节点间的旅行时间(成本)不仅取决于节点间的距离,还依赖于一天中具体时段或节点在哈密顿圈中所处的具体位置.对基于节点所处哈密顿圈中具体位置的TDTSP问题建立相应的数学模型,并提出求解该问题的动态搜索算法.通过实验仿真,验证了动态搜索算法优于目前在邻域搜索领域求解该问题最有效的动态规划启发式算法.

基于ILS-CS优化算法的个性化旅游线路研究

针对迭代局部搜索(iterated local search,ILS)算法求解旅游线路时间花费较长的问题,提出了一种ILS结合布谷鸟搜索(cuckoo search,CS)的优化算法,来优化旅游线路的时间花费。该算法首先根据相关目标和约束采用ILS算法求解旅游景点及初始旅游线路,然后在满足旅游景点时间窗约束及景点总数不变的情况下采用CS算法进一步最小化旅游线路的时间花费。该研究获得的线路更符合旅游习惯,并且旅游时间花费更少。通过Daminaos数据集和桂林景点数据集进行验证,结果表明该优化算法相比于仅使用ILS算法所规划出的旅游线路,平均时间花费减少8%,更符合用户旅游选择习惯。

Multi-agent based modeling for order distribution cooperative negotiation in supply chains

With the new characteristics of global cooperation in supply chains being synthetically considered,a hybrid model to the cooperative negotiation process for the order distribution in supply chain is mainly studied.After reviewing and analyzing some main domestic and overseas processes in cooperative negotiation modeling in supply chain,some problems are subsequently pointed out.For example,the traditional simple multi-agent system(MAS)frameworks which have some limitations,are not suitable for solving modeling complex systems.To solve these problems,thinking with the aid of the multi-agent structure and complex system modeling,the manufacturing supply chain is taken as an example,and a time Petri net production model is adopted to decompose the materials.And then a cooperative negotiation model for the order distribution in supply chain is constructed based on combining multi-agent techniques with time Petri net modeling.The simulation results reveal that the above model helps solve the problems of cooperative negotiation in supply chains.

需求随机条件下冷藏集装箱堆场机修工路径优化

由于在集装箱码头堆场冷藏集装箱插拔电需要由机修工手动完成,为降低未能及时对冷藏集装箱插电而造成箱内货物腐败的风险,对机修工路径进行优化来减少总完工时间。建立考虑机修工的准备时间和惩罚时间的机修工插拔电路径规划模型,选用遗传算法对模型进行求解。通过算例实验证明了模型和算法的有效性。

Influence of Auxiliary Equation on Wave Functions for Time-Dependent Pauli Equation in Presence of Aharonov-Bohm Effect

Invariant operator method for discrete or continuous spectrum eigenvalue and unitary transformation approach are employed to study the two-dimensional time-dependent Pauli equation in presence of the Aharonov-Bohm effect （AB） and external scalar potential. For the spin particles the problem with the magnetic field is that it introduces a singularity into wave equation at the origin. A physical motivation is to replace the zero radius flux tube by one of radius R, with the additional condition that the magnetic field be confined to the surface of the tube, and then taking the limit R → 0 at the end of the computations. We point that the invariant operator must contain the step function θ（r - R）. Consequently, the problem becomes more complicated. In order to avoid this dimculty, we replace the radius R by ρ（t）R, where ρ（t） is a positive time-dependent function. Then at the end of calculations we take the limit R →0. The qualitative properties for the invariant operator spectrum are described separately for the different values of the parameter C appearing in the nonlinear auxiliary equation satisfied by p（t）, i.e., C 〉 0, C = 0, and C 〈0. Following the C＇s values the spectrum of quantum states is discrete （C 〉 0） or continuous （C ≤ 0）.

Effect of outplanting time on commercial cultivation of kelp Laminaria saccharina at the southern limit in the Atlantic coast,N.W.Spain

The aim of the study is to examine the influence of the outplanting time on the cultivation of the kelp Laminaria saccharina in the northwestern Spain, close to its southern limit of distribution in the North Atlantic coast. We compared two L. saccharina cultures outplanted in February and December. We found that the starting time of outplanting affects to the yield and the substantiality value, as well as the growth rate. The yield, the substantiality value and the growth rates of L. saccharina sporophytes obtained for the trial outplanted in December were significantly higher than those in February. These results can be mainly explained by the effect of temperature on the growth of L. saccharina sporophytes during cultivation. On the other hand, our results show that even in the southern limit of distribution of L. saccharina, the cultivation of this species was very profitable in high yield and quality.

The Mode of Innovation and Entrepreneurship of Maker Space Based on ＂Intemet ＋＂——Take 36 Kr as an Example

The lnternet age has penetrated deeply into people＇s life. Some existing Intemet patterrrs can not meet the needs of consumers.With the development of ＂Internet ＋＂, the innovation and entrepreneurship of Internet are emerging. New electric business, incubator, maker space are becoming popular innovative modes and develop rapidly. In this paper, we will discuss the change of innovation and entrepreneurship under the＂ lnternet ＋＂ era by taking maker space 3 6 Kr as an example.

Effect of Trader Composition on Stock Market

In this study, we build a double auction market model, which contains two types of agent traders, i.e., the noise traders and fundamentalists, to investigate the effect of the trader composition on the stock market. It is found that, the non-trivial Hurst exponent and the fat-tailed distribution of transaction prices can be observed at any ratio of the noise traders. Analyses on the price variation properties, including the Hurst exponent and the price variation region, show that these properties are stable when the ratio is moderate. However, the non-price variation properties, including the trading volume and the profitability of the two kinds of agents, do not keep stable untrivially in any interval of the ratio of noise traders.

A Few Remarks on Milburn Equation

After presenting the infinite operator-sum form solution to the Milburn equation dp/dt=γ（UρU^f - ρ）=γU[p, Uf], where U=e^-iH/hγ, and verifying that this equation preserves the three necessary conditions of density operators during time evolution, we prove that the yon Neumann entropy increases with time. We also point out that if A and B both obey the Milburn equation, then theproduct AB obeys （d/dt）（AB） = γU[AB, U^f]-（1/γ）（dA/dt）（dB/dt）, which violates the Milburn equation, this reflects that a pure state will evolve to a mixture in general

Modeling the growth and policy implications of Global System for Mobile Telecommunication （GSM） in Nigeria

This paper investigated the growth and policy implications of Global System for Mobile Communication in Nigeria. Stochastic economic modeling was used to analyze Nigeria＇s time series data. The models were adjudged reliable before they were used. The components of the model were defined and a prior expectation of the relationship among the variables explained for the purpose of giving the reviewers and users a deep insight into the phenomenon under study. The secondary data used for the study were processed using the E-View for windows electronic packages. The outcome of the empirical and stochastic investigations shows that Global System for Mobile Communication has a positive relationship with output growth in Nigeria. The impact is of a higher magnitude. The usage of Global System for Mobile Telecommunication led to 17 percent rise in the output growth. The findings suggest the need for the Nigerian Communication Commission （NCC） and the federal government of Nigeria to expand tele-density and directly make telephone communications cheap and accessible. To achieve this goal, more licenses should be given to GSM operators in order to allow for healthy competition among them. This will lead to improved quality of services, quality of product and consequently sustain the growth and development of the country.

讲述与朗读状态下呼吸差异的初步分析

本文使用呼吸传感器对四位被试在朗读和讲述时呼吸的不同表现进行了初步分析,结果表明,不同状态下言语呼吸的节律有明显的差异。其中讲述状态下呼吸的特点表现为句中短小停顿减少,曲线中较大的起伏偏多;吸气段以幅度的减小为特征,而呼气段则以时长的延长为特征;呼、吸斜率分别以陡升、缓降为主,峰型变化相对较少;RTQ的值随着韵律单位等级的提高而变小,且一般比朗读状态下相应的RTQ值小。

Comparison Study of Two Commercial Spectrometers for Heavy Metal Analysis of Laser Induced Breakdown Spectroscopy （LIBS）

The purpose of this paper is to compare the performance of two spectrometers that are manufactured from the same company. In this work, heavy metals like lead Pb and copper Cu in the KBr matrix were analyzed using the laser induced breakdown spectroscopic technique. A Q-switched Nd：YAG laser with 90mJ per pulse operating at the fundamental wavelength of 1064nm and pulse duration of 10 ns was used to generate plasma at the focal region. The important experimental parameters such as the laser energy, integration time, distance between the lens and sample, distance and angle of the optical fiber from the target were optimized. Two spectrometers manufactured by Ocean Optics namely as Maya2000Pro and USB 4000 were employed for anlyzing the spectral lines. The experimental setup and conditions were remained the same for both experiments. The production of spectral lines from each of the interested elements was analyzed and compared with the NIST （National Institute of Standards and Technology） database. The sensitivity, repeatability and limit of detection for each of the systems are discussed in detail.

GROUP CONSENSUS FOR MULTIPLE NETWORKED EULER-LAGRANGE SYSTEMS WITH PARAMETRIC UNCERTAINTIES

In this paper,a group consensus problem is investigated for multiple networked agents with parametric uncertainties where all the agents are governed by the Euler-Lagrange system with uncertain parameters.In the group consensus problem,the agents asymptotically reach several different states rather than one consistent state.A novel group consensus protocol and a time-varying estimator of the uncertain parameters are proposed for each agent in order to solve the couple-group consensus problem.It is shown that the group consensus is reachable even when the system contains the uncertain parameters.Furthermore,the multi-group consensus is discussed as an extension of the couple-group consensus,and then the group consensus with switching topology is considered.Simulation results are finally provided to validate the effectiveness of the theoretical analysis.

Characteristic-based operator-splitting finite element method for Navier-Stokes equations

A new finite element method, which is the characteristic-based operator-splitting (CBOS) algorithm, is developed to solve Navier-Stokes (N-S) equations. In each time step, the equations are split into the diffusive part and the convective part by adopting the operator-splitting algorithm. For the diffusive part, the temporal discretization is performed by the backward difference method which yields an implicit scheme and the spatial discretization is performed by the standard Galerkin method. The convective part can be discretized using the characteristic Galerkin method and solved explicitly. The driven square flow and backward-facing step flow are conducted to validate the model. It is shown that the numerical results agree well with the standard solutions or existing experimental data, and the present model has high accuracy and good stability. It provides a prospective research method for solving N-S equations.