熵权法在水利水电工程多准则综合评价中的应用

引入熵权优选模型,以百色水利枢纽工程不同开发规模的决策为例,根据工程效益、工程费用、生态修复成本三个准则进行评价。结果表明:正常蓄水位可取227￣229米,而工程实际的正常蓄水位为228米,说明熵权法在水利水电工程多准则综合评价方面较理想。     

Distributed optimization using virtual and real game strategies for multi-criterion aerodynamic design

This paper introduces the virtual and real game concepts to investigate multi-criterion optimization for optimum shape design in aerodynamics. The constrained adjoint methodology is used as the basic optimizer. Furthermore, the above is combined with the virtual and real game strategies to treat single-point/multi-point airfoil optimization. In a symmetric Nash Game, each optimizer attempts to optimize one’s own target with exchange of symmetric information with others. A Nash equilibrium is just the compromised solution among the multiple criteria. Several kinds of airfoil splitting and design cases are shown for the utility of virtual and real game strategies in aerodynamic design. Successful design results confirm the validity and efficiency of the present design method. Supported by the National Natural Science Foundation of China (Grant No.10372040)     

随机时间依赖路网中危险品运输路径多准则优化

为实现动态路网中的危险品运输路径优化,以期为运输商的路径选择提供决策支持,分析了运输网络的随机时间依赖(STD)特征,对分段连续时间区间内各路段的行程时间和受影响人数进行曲线拟合.考虑到达时间窗的约束,以行程时间和运输风险的随机属性值为优化准则,建立0-1整数规划模型.结合STD网络的FIFO性质设计了两阶段多维标号修正算法,得到不同出发时刻以给定置信水平满足时间窗约束的非支配路径集合,并提出准则权重和阈值支配方法,实现计算效率和求解质量的均衡.研究结果表明:危险品在STD路网中的行程时间和运输风险与到达时间窗的设置和出发时刻的选取有关;生成的非支配路径取决于出发时刻和运输商的选择偏好,非支配路径的数量取决于支配阈值的大小;不同类型运输商可根据准时到达置信水平来选择出发时刻与运输路径的最优组合.     

WiMA: Towards a Multi-Criterion Association in Software Defined Wi-Fi Networks

Despite the planned installation and operations of the traditional IEEE 802.11 networks, they still experience degraded performance due to the number of inefficiencies. One of the main reasons is the received signal strength indicator (RSSI) association problem, in which the user remains connected to the access point (AP) unless the RSSI becomes too weak. In this paper, we propose a multi-criterion association (WiMA) scheme based on software defined networking (SDN) in Wi-Fi networks. An association solution based on multi-criterion such as AP load, RSSI, and channel occupancy is proposed to satisfy the quality of service (QoS). SDN having an overall view of the network takes the association and reassociation decisions making the handoffs smooth in throughput performance. To implement WiMA extensive simulations runs are carried out on Mininet-NS3-Wi-Fi network simulator. The performance evaluation shows that the WiMA significantly reduces the average number of retransmissions by 5%–30% and enhances the throughput by 20%–50%, hence maintaining user fairness and accommodating more wireless devices and traffic load in the network, when compared to traditional client-driven (CD) approach and state of the art Wi-Balance approach.     

Optimization of process variables in drilling of carbon fiber reinforced plastics using various multi criteria decision making approaches

Carbon fiber-reinforced polymers are one of the lightweight materials used in structural design due to their exceptional mechanical performances. The drilling operation is indispensable as it facilitates the assembling of various manufactured components. However, drilling of fibrous laminates is deemed difficult in comparison to the traditional metals because of the anisotropic and non-homogeneous nature. The present work addresses the parametric effect on the drilled hole delamination and further reduces it with an optimal combination of parameters for multi-objectives using different multi-criterion decision-making techniques. Initially, the response surface-based regression model of delamination as a function of three static inputs has been developed, further revised with induced thrust as well as mean torque for the improvisation of the prediction capability. Finally, for the overall improvement, a decision-making model has been used that includes grey relation analysis, technique for order performance by similarity to ideal solution, and VIšekriterijumsko Kompromisno Rangiranje method. The delamination was found to be minimum at a low drill point angle (100°), high spindle rotation (2150 min⁻¹ ), and low feed rate (0.025 mm/rev) due to reduced thrust force. The mean absolute prediction error was significantly improved considering root mean square torque rather than axial thrust with process variables.     

基于层次分析法和信息熵的多准则指标选取

在新装备测试指标选取过程中,由于列装时间短,测试样本少,测试条件不足,通常选取工作无据可依。通过分析层次分析法、Dijkstra法、粗糙集法的优缺点,提出一种基于层次分析法、群组G1法和信息熵理论的指标多准则选取方法,将指标按几个基本准则两两比较获得原始数据,用群组G1法通过专家评判和信息熵法分析原始数据来确定评价准则的权值,最后对原始数据进行加权来对指标进行权重判断。文章结尾给出一个实际算例。方法依赖于两两比较数据,具有一定客观性,且无需进行样本测试,简化了指标选取工作。     

施工导流方案的多目标总体综合评价方法

施工导流方案的选择是一个复杂的多目标决策问题，针对施工导流工程的特点，建立了多目标决策模型；利用改进层次分析法（IAHP），确定各目标在评价对象中的权重，再根据多目标决策理论，将其转化为单指标决策模型；利用总体综合评价方法对方案进行评价，算例验证了该方法的可行性，分析中以为导流方案选择提供决策支持。     

基于云模型的语言随机多准则决策方法

为解决不完全信息的语言随机多准则决策问题,设计了一种将一维正态云与相对满意度相结合的求解方法。该方法首先根据正态分布规律与黄金分割率法,将各方案在各准则下的不确定语言评价标度转化为近似的一维正态云;接着采用数字特征差异法,度量在各准则下各方案与正、负理想方案之间云的距离;然后利用区间数的运算法则,求取各方案与正、负理想方案之间的加权距离;最后计算各方案的相对满意度,进而确定排序。以城市公交线网优化为例,验证丁该方法的有效性和可行性。     

基于拓展算子的灰色随机多准则决策方法

为解决准则权重为区间数、准则值为梯形灰色随机数的灰色随机多准则决策问题,设计了一种基于梯形连续区间有序加权平均算子的方法。该方法首先定义梯形灰色随机数描述不完全确定的准则值;然后根据基本单位区间单调函数的性质拓展连续区间有序加权平均算子形成梯形连续区间有序加权平均算子;再利用梯形连续区间有序加权平均算子集结梯形灰色随机数;通过规范化决策矩阵和目标权重向量得到各方案的综合评价值;最后确定各方案的排序。算例结果验证了该方法的有效性和可行性。     

多属性决策方法及其应用

系统介绍决策分析理论中的多属性决策方法,在此基础上,对我院的专升本进行了研究,给出了应用多属性决策方法的结果,并将之与实际情况进行了比较.