两阶段混合引导的偏好多目标优化算法

在偏好多目标优化问题求解中,基于偏好点引导方式的优化算法性能易受偏好点具体位置的影响,且不能控制偏好解集大小;而基于偏好区域引导方式的优化算法虽然能控制偏好解集规模,但算法初期收敛效率不够高。针对此问题,提出一种两阶段混合引导的偏好多目标优化算法。算法初期采取偏好点的引导方式,同时引入偏好界限动态调整策略,使得种群快速收敛到偏好区域附近。迭代一定次数后,采用偏好向量引导方式指导算法搜索,达到控制偏好解集范围的目的。与几种经典的偏好优化算法进行实验对比分析,结果表明,所提算法性能不受偏好点位置影响,得到的偏好解集能很好地表征决策者的偏好信息,并且控制了偏好解集范围,便于决策者的最终决策。     

群体决策中集成两类偏好信息的多目标粒子群优化方法

根据多个决策者给出关于目标的两类偏好信息-参考点和目标优先次序,建立了一个能集成这两种偏好的多目标粒子群优化算法.该算法首先分别按距离和目标值对解进行排序、赋予偏好值,然后将它们组合得到集成偏好值,并用集成偏好值引导粒子向群体偏好的Pareto前沿收敛,最后运用ε- 排斥思想实现解在Pareto边界分布的均匀性.仿真结果表明该算法有效.     

一种基于模糊逻辑引入偏好信息的多目标遗传算法

针对多目标优化存在多个非支配解、用户难以挑选的问题,该文提出一种交互式引入决策者偏好信息的多目标遗传算法.该算法使用一种新型的九级标度赋值法把决策者通过语言表达的偏好信息量化为各目标的重要性因子,采用模糊推理系统构造一种基于偏好信息的"强度优于"关系替代常规的"Pareto支配"关系,以比较个体之间的优劣.对算法的计算复杂度进行了理论分析.仿真实验表明,该算法具有实时处理偏好信息的能力,与2种经典多目标遗传算法相比,该算法能够搜索到质量更优的解.     

基于有限理性的船型方案优选

在考虑决策者的有限理性的基础上解决船型方案优选问题.首先,详细分析了船型方案优化和优选问题的特殊性及当前研究中待解决的问题;其次,基于人的有限理性的特点,引入偏好设计理论和前景理论,从数学角度定性、定量描述决策者的决策偏好和决策心理;基于偏好设计理论,生成表征设计者偏好的船型方案Pareto解集,利用前景理论编辑决策者的决策风险偏好,基于Pareto解集进行船型方案优选;再次,以理性数值分析为参考,基于决策者的预期效用对数值分析结果进行修正,得出符合实际决策情景的最佳船型方案.最后,通过算例分析验证了方法的有效性.     

基于模糊折中规划的稳健多目标优化设计

针对稳健设计目标函数与波动之间的冲突及协调问题,提出了一种基于模糊折中规划的稳健设计多目标优化方法. 该方法在考虑工程稳健设计中大量存在的模糊因素的前提下,建立目标函数以及波动的隶属度函数,利用模糊偏好分配每个目标的权重从而均衡目标函数值和波动之间的平衡. 该方法将决策者的偏好充分体现到决策过程中,从而得到决策者所期望的折中解. 从实例结果可以看出,模糊折中规划适合于求解稳健优化设计问题.     

随机环境下多目标设计优化问题的交互式算法

从通信网络和运输安排等工程问题中提出了一类多目标随机优化模型,该模型含有一个随机线性和随机二次目标函数,还含有随机线性约束.基于决策者的期望水平将多目标优化模型转化为单目标优化问题;利用新的方差期望综合法研究了此类优化问题的确定型等价类,并设计了求解这类问题的基于决策者偏好的交互式算法.数值实验表明:方差期望综合优于已有方法,它既能够反映决策者的满意度,又能够得到更稳健的最优解.     

集成化服务链多目标全局优化模型与算法

基于集成化服务链网络模型和候选服务资源评价指标,建立集成化服务链的多目标全局优化模型,并提出一种基于改进多目标遗传算法的集成化服务链多目标全局优化算法。算法采用基于距离的无参数种群多样性度量算子,在适应值分配、精英保持和选择操作中均进行了种群多样性控制,能在满足多约束条件下同时优化多个目标,得到一组满足决策者不同主观偏好的Pareto全局最优解集。仿真实验表明算法具有全局收敛性并具有较好的解的质量和分布,能有效求解集成化服务链多目标全局优化问题。     

基于TOPSIS算法的群体决策研究

TOPSIS算法是一种常用的有限方案多属性决策分析法,这种方法以靠近理想解和远离负理想解的程度作为评价指标.因TOPSIS算法对对象的评价既全面又客观,所以在多属性决策中得到广泛的应用.将TOPSIS算法应用到群体决策中,可综合各方案的特点、各决策者的偏好以及重要程度得到令群体相对满意的决策.     

风险显性区间数线性规划模型(REILP)解对约束风险偏好的敏感性与稳健性研究

利用数值试验的方法考察了风险显性区间数线性规划(REILP)模型最优解的稳健性问题, 即其最优解在决策者对不同约束条件存在偏好的情况下是否一致。数值案例一为基于污染物总量控制的土地利用规划问题, 目标是在污染物排放总量符合约束的前提下实现不同农业种植组合的收益最大化; 数值案例二为基于污染物总量控制的水资源优化分配问题, 目标是在污染物排放总量满足约束的前提下, 企业间水资源利用分配所获得的效益最大化。 数值试验结果表明, REILP的解在某些情况下呈现稳健性特征, 但在另一些情况下则呈现出最优解随着决策者对约束条件偏好的不同而产生变化的特征。REILP模型的这种特点表明, 在实际应用中, 建模人员需要特别分析最优解对决策者偏好的响应, 从而产生有效稳健的决策支持。此外, REILP解对决策者偏好的变异性也使其具备能够在不确定性条件下产生多种替代方案的能力。     

航空网络航路点布局的多目标优化设计

航路网络中航路点布局问题（CWLP）是航路网络规划的核心。基于此,从航路网络经济性和安全性出发,考虑航路运行成本和潜在冲突系数两个因素,建立航路点布局多目标优化模型,求解时采用动态递变权重系数的蝙蝠算法以保证运行成本和潜在冲突系数能同时获得较优解。最后对北京飞行情报区进行仿真实验,将蝙蝠算法（BA）与其他多目标算法对比,得到4种算法的非支配解,证明多目标蝙蝠算法在求解航路点布局的大规模优化问题上,能够获得更优解。同时,考虑偏好经济性和偏好安全性两种情况选择两组权重,数据显示,与初始网络相比,这两种情况下网络运行成本和冲突系数减少比例分别为9.99%、15.64%以及-3.97%、65.81%。实验结果表明,该方法能够在航路点布局规划上给决策者以多种优化方案。     

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.     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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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