改进蚁群算法求解多目标优化问题

针对传统蚁群算法在多目标优化问题中容易陷入局部最优的缺点,提出一种采用直接学习机制的改进蚁群算法。该算法通过采用模拟蚂蚁用触角交流信息过程的直接通信学习机制,用以改进信息素的更新规则,从而维持群体的多样性。通过两组多目标基准函数验证算法性能,仿真结果表明该算法所获得的Pareto解具有多样性以及均匀分布性,有效地提高了蚁群算法全局寻优的能力。     

制造企业动态联盟合作伙伴组合优化方法

将制造企业动态联盟合作伙伴的选择和组合抽象为多目标优化问题，提出改进的蚁群算法——“小生境蚁群算法”及“小生境信息差”的创新概念并对其进行优化求解，在正反馈环节中引人时变参数并利用经验信息和启发信息进行解算，从而有效地防止遗传算法中的“早熟”和基本蚂蚁算法中可能发生的“停滞”状态，获得选择合作伙伴多目标组合优化问题的最优解．     

双目标旅行商问题及其蚂蚁算法实验研究

对双目标旅行商问题设计了基于Pareto概念的多目标蚂蚁算法.借助于算法的全局搜索能力,在整个解空间内快速搜索多目标组合的Pareto有效解,并利用多目标蚂蚁算法维持解集多样性的特点,使搜索到的Pareto解在前沿均匀分布.经大量算例求解验证了其有效性,该算法具有较好的通用性.     

无线传感器网络中多基站定位的多目标蚁群算法

根据多目标进化算法思想,提出了无线传感器网络中多基站定位的多目标蚁群算法.该算法用一组蚂蚁并行搜索,用一个蚂蚁所在位置表示一个基站定位,多蚂蚁位置的组合表示多基站的定位.计算单基站和多基站定位的适应度,再根据这两个适应度值调整蚂蚁觅食路径上的信息素,蚂蚁沿着信息素强的方向搜索,不断逼近多目标优化的Parote解,从而获得全局优化的多基站定位解.实验结果表明,该算法求得的多基站定位位置能有效提高网络性能,且适用性强.     

多目标电网规划的一般最优化模型

针对现有电网规划中难以很好综合考虑经济性和可靠性的问题，在对电网规划进行数学描述的基础上，以供应方开发成本最小和需求方缺电成本最小为目标函数，提出了多目标电网规划的一般最优化模型，并直接在算法的寻优过程体现该最优化模型．同时以改进的混合遗传模拟退火算法为求解工具，来解决该多目标电网规划问题．算例证明了该模型的有效性．     

基于合成时空谱的多目标运动分析

针对水下多目标的检测与定位问题，提出了一种基于合成时空谱的多目标运动分析方法．该方法可对多个弱目标同时实现检测、定位、跟踪和运动分析，避免了多目标跟踪中的数据关联、轨迹交叉等信号处理难点，提高了算法的适用性．研究利用遗传算法的小生境技术，实现了多目标的运动参数估计．仿真结果表明，在低信噪比情况下，对强度不等、轨迹交叉的2个目标仍可进行有效地定位和跟踪．     

一种基于分解的改进的多目标蚁群算法及其应用

提出一种基于分解的、改进的多目标蚁群算法。该算法首先利用Tchebycheff聚合方法将整个Pareto最优前沿的逼近问题分解为一定数量的单目标优化子问题,然后利用蚁群算法同时求解这些子问题。为使解集均匀分布在Pareto前沿,采用基于试探的聚类方法对解集聚类;依据解集的分布重置分解策略中的权重向量集,使其适配于特定的Pareto前沿;蚂蚁按照对应的权重距离被分组,同一组蚂蚁共享一个信息素矩阵,该矩阵容纳学习到Pareto前沿子区域的位置信息;每个蚂蚁求解一个子问题,每个蚂蚁拥有自己的启发式信息矩阵;每个蚂蚁拥有多个邻居,蚂蚁选取邻居中的最优解来更新当前解;蚂蚁依据小组信息素,当前解和启发式信息构建新的解。引入自适应变异算子,动态调整蚂蚁邻居的个数,提高算法的收敛速度和解的质量。将该算法与其他相关算法在标准的双旅行商问题进行性能对比,证明该算法有效。     

基于生态捕食模型的多目标优化问题求解算法

根据种群生态学中的捕食模型，将多个目标的权值对应到生态系统的种群规模，利用生态捕食模型的动态周期性变化特性，提出了一种新的进化多目标优化算法．该算法通过生态捕食模型来动态调整各个目标的权值，无需人为指定，从而减少了对问题知识的依赖，快速找到非劣解集．文中给出了权值调整策略的参数选择标准，并选择几个比较困难的多目标函数优化问题做了实验．实验结果表明了新方法的有效性．     

基于遗传算法的静电反馈式微传感器多目标优化

讨论了一种新型梳齿式静电反馈微加速度计的多目标参数优化问题，从耦合静电场能量关系出发，建立了系统的动态模型．在此基础上，以灵敏度、分辨率和动态响应为优化目标，通过目标规划法，构建了系统的多目标优化模型．利用遗传算法进行优化求解，并与序列二次规划法的优化解进行了对比分析，研究结果表明，这2种算法均能成功地求解优化问题，但遗传算法可得到设计者更为满意的多目标有效解．研究工作为进一步利用遗传算法的随机性和潜在并行性进行系统的Pareto多目标优化提供了基础．     

基于改进蚂蚁算法的梯级水电站短期优化调度

将改进型蚂蚁算法用于梯级水电站短期优化调度问题，并通过引入遗传算法的交叉和变异思想以及自适应搜索半径方法提高了蚂蚁算法的搜索能力．以最小耗水率模型为例，给出了梯级水电站短期优化调度问题改进型蚂蚁算法的数学描述和求解的算法步骤，并通过龙羊峡．李家峡梯级水电站实例验证了改进型蚂蚁算法的优越性．结果表明，与遗传算法相比，改进型蚂蚁算法获得了更优的调度方案．优化结果在取得更低耗水率的同时，减少了机组的启停次数，并且使所有机组连续高效运行，从而降低了机组的维护费用，并增加了梯级的经济效益．     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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