一种基于双线性链表结构编码的遗传算法

针对基于以往经典编码方式的遗传算法解决并行机大批量成组调度问题时的弊端,提出了一种基于双线性链表结构编码的遗传算法（DLGA）,并设计了相应的遗传算子。应用于某轮胎厂的硫化工序调度问题,进行了仿真分析。     

无线传感器网络中基于簇协作的分布式组密钥管理方案

处于敌对环境的传感器网络极易遭到攻击,且不存在长期可信的节点可以担当组管。提出一种分布式组密钥管理方案,方案基于簇形结构,充分利用簇内通信及簇间通信的局部特性,对组密钥协作更新。当妥协节点总数在门限以内的某簇检测出节点妥协时,该簇的簇头发起更新,并通过簇内协作将该节点撤销;当某簇妥协节点数目在门限以上时,由该簇邻居簇的簇头发起更新,并通过簇间通信将该簇妥协节点撤销。与已有方案相比较,此方案能实时地更新组密钥,有着更好的安全性并具有较小的通信开销。     

Web数据挖掘中的可信数据来源

从大量Web信息中获取有用的信息是Web数据挖掘的关键问题.如何评价web信息是否可信,现在主要方法是通过BadRank算法进行内容评测,或是通过链接权重进行相关引用数计算.可信数据来源是数据挖掘的前提,在基于关键词的数据挖掘中,通过评价挖掘所涉及的不同数据域,以及数据域自身的可信性,对在不同域所获得的挖掘数据给以权重,从而对挖掘结果的序列产生影响,提高挖掘算法在获取可信结果方面的效率.并通过试验测试了可信域评价的效果.     

基于系统动力学的环境污染演化博弈问题研究

用系统动力学建立环境污染管理问题中政府管理部门与生产排污企业之间的一个混合战略演化博弈模型.仿真结果表明:非对称结构的2*2混合策略演化博弈模型不存在演化均衡.从监管部门的角度出发,改变博弈支付矩阵在演化博弈过程始终保持不变的情况,在博弈支付矩阵中考虑动态惩罚策略.结果表明,本策略的演化博弈模型存在演化稳定均衡,即Nash均衡.系统动力学为演化博弈理论的验证和应用提供一个政策仿真实验平台.     

步进频率探地雷达的实时处理器软件设计

数据预处理是探地雷达系统中的一项重要内容,针对步进频率探地雷达的数据处理工作量大的特点,引入数字信号处理器(DSP)来完成数据预处理任务.在此基础上,构建了DSP处理软件的整体框架,详细设计了软件的各功能模块,并定义了数据的通信协议.所设计软件具有良好的拓展性和可选择性,经实际数据测试,在处理时间上能够满足实时性的要求.     

基于双Kohonen神经网络的Web用户访问模式挖掘算法

本文根据Kohonen自组织特征映射神经网络中学习阶段的性质,运用双Kohonen神经网络组合成新的自组织训练挖掘模型,先使用粗调整训练,加快模型学习速度,紧接着使用微调整训练,提高模型学习精度。实验结果表明,本文提出的双Kohonen神经网络挖掘模型,相对于标准Kohonen神经网络在训练速度和收敛效果上都有一定程度的提高,改善了聚类效果,为挖掘用户的多种兴趣提供了一种可行的方法。     

复杂产品开发项目调度问题的模糊优化算法

对具有不确定时间参数的复杂产品开发项目调度问题,提出一种有效的模糊优化调度算法-基于预测的模糊BoP项目调度算法.首先,用模糊数表示不确定的时间参数,并构造相应的模糊数运算方法,对适合于确定性调度问题的BoP算法进行扩展,使其能处理模糊性时间参数.其次,修正了BoP算法中子项目调度方法,提高了算法的调度性能,降低了计算复杂度.大量的数值仿真实验表明,与基于启发式规则的调度算法相比,模糊BoP算法更适合于具有不确定时间参数的复杂产品开发项目调度问题.     

动漫类课程艺术素养与技术能力培养途径探析

动漫类岗位需要很强的艺术素养和技能,才能对设计作品有较好的理解和体现。本文对动漫类课程中培养学生的艺术素养与技术能力的途径进行探讨,并对艺术素养与技术能力的综合素质训练及其体现方式进行分析。     

Small Changes,Big Impact: Tungsten Bronzes with Extremely Large Second Harmonic Generation Achieved by the Transition Metal Doping on the B-Site

Two novel transition metal-doped tungsten bronze oxides, Pb_2.15Li_0.85Nb_4.85Ti_0.15O₁₅ (PLNT) and Pb_2.15Li_0.55Nb_4.85W_0.15O₁₅ (PLNW), are synthesized by high-temperature solid-state reactions. The Rietveld method using the high-resolution synchrotron radiation indicates that PLNT and PLNW crystallize in the orthorhombic polar noncentrosymmetric space group, Pmn2₁ (no. 31). As a class of tungsten bronze oxide, PLNT and PLNW retain a unique rigid framework composed of d⁰ transition metal cation (Ti⁴⁺ or W⁶⁺)-doped highly distorted NbO₆ octahedra along with the subsequently generated Pb/LiO₁₂ and PbO₁₅ polyhedra. Interestingly, the d⁰ transition metal-doped tungsten bronzes, PLNT and PLNW, exhibit extremely large second-harmonic generation (SHG) responses of 56 and 67 × KH₂PO₄, respectively. The observed immeasurably strong SHG is mainly attributed to a net polarization originating from the alignment of highly distorted NbO₆ octahedra with doped transition metals in the frameworks. It is believed that doping transition metal cations at the B-site of the tungsten bronze structures should be an innovative strategy to develop novel high-performance nonlinear optical materials.     

Designing Metallic and Insulating Nanocrystal Heterostructures to Fabricate Highly Sensitive and Solution Processed Strain Gauges for Wearable Sensors

All‐solution processed, high‐performance wearable strain sensors are demonstrated using heterostructure nanocrystal (NC) solids. By incorporating insulating artificial atoms of CdSe quantum dot NCs into metallic artificial atoms of Au NC thin film matrix, metal–insulator heterostructures are designed. This hybrid structure results in a shift close to the percolation threshold, modifying the charge transport mechanism and enhancing sensitivity in accordance with the site percolation theory. The number of electrical pathways is also manipulated by creating nanocracks to further increase its sensitivity, inspired from the bond percolation theory. The combination of the two strategies achieves gauge factor up to 5045, the highest sensitivity recorded among NC‐based strain gauges. These strain sensors show high reliability, durability, frequency stability, and negligible hysteresis. The fundamental charge transport behavior of these NC solids is investigated and the combined site and bond percolation theory is developed to illuminate the origin of their enhanced sensitivity. Finally, all NC‐based and solution‐processed strain gauge sensor arrays are fabricated, which effectively measure the motion of each finger joint, the pulse of heart rate, and the movement of vocal cords of human. This work provides a pathway for designing low‐cost and high‐performance electronic skin or wearable devices.