竞争型径向基过程神经网络时序分类器

针对时序分类问题,提出一种竞争型径向基过程神经网络时序分类器.给出了复合竞争过程神经元单元的定义,引入复合竞争过程神经元隐层,利用竞争型径向基过程神经网络输入为时变函数的特点,由复合竞争过程神经元单元完成对过程式输入信息的模式匹配和时空聚合运算,给出了具体学习算法,省去了输出层线性连接权的计算,简化了网络结构和训练过程,提高了网络泛化能力.最后以UCI数据集多变量时序分类问题验证了分类器的有效性.     

网构软件系统中基于信誉激励的协作博弈模型

为了促使网构软件系统中各软件服务实体在彼此交互、协作的过程中自主的形成协作关系,提出了一种网构软件系统中将信誉评估与博弈理论相结合的协作博弈演化模型GBDTM(games-based DyTrust model).该模型借鉴经济学中博弈论的思想,对网构软件系统中实体节点的协作过程进行博弈分析与建模,并通过在博弈模型中引入节点的信誉值,对博弈模型中的收益函数进行修正,GBDTM有效地建立了节点之间的激励合作机制,促进各实体节点间的协作,提高了网构软件系统的整体安全性能.     

基于温度场的冻土路基变形数值分析及对比

考虑相变和全球气温升高的影响,利用数值分析方法,对青藏铁路典型路基的变形问题进行了分析和数值模拟。通过建立路基有限元模型,选取适当的边界条件、初始条件及热学计算参数,在计算了典型路基断面温度场变化的前提下,对三年的路基变形场进行了数值分析并与实际测试资料进行了对比分析。分析表明,融化沉降在一年内已基本完成,并逐渐开始回冻,两三年后,除路堤填料和地基的进一步压密外,蠕变效应开始显现。因此,对高温、高含冰量冻土而言,蠕变产生的沉降变形是不可忽略的。     

机载雷达空时二维信号处理自适应权值训练的距离分段递推算法

本文针对机载预警雷达的杂波环境，分析了杂波数据的非平稳性，由此提出在距离上分段实现空时二维自适应处理（STAP）的方法，并通过分析杂波于空间的距离来确定分段的方法。在同时考虑实时性和处理器性能的前提下，给出了一种自适应权值计算的递推算法。理论分析和计算机仿真结果均表明，本文提出的分段递推算法是有效的。     

蒙乃尔合金的焊接

蒙乃尔合金是一种机械性能和加工性能好、耐腐蚀性强的Ｎｉ－Ｃｕ含金。在焊接加工时容易产生热裂纹和气孔等缺陷，通过对这些缺陷的分析，找出了缺陷产生的原因，经过焊接工艺试验，制订出了合理的焊接工艺参数，解决了焊接中的热裂纹和气孔问题。     

功能语法关照下的中国古诗词翻译研究

探讨了中国古诗词翻译过程中所存在的障碍及原因,分析了系统功能语法中语境理论指导古诗词翻译的可行性及理论依据。以古诗《清明》的两则翻译为例,检验了功能语法在中国古诗词翻译过程中的可应用性及可操作性。分析结果表明,功能语法语境理论的运用不但能够品析一些译作的优劣,而且能使翻译实践整个过程更为清晰、明确,译作更能被译文读者理解并产生美的共鸣。     

A New Consensus Algorithm for Multi-Agent Systems via Decentralized Dynamic Output Feedback

In this paper, we study a consensus problem for multi-agent systems via dynamic output feedback control. The entire system is decentralized in the sense that each agent can only obtain output information from its neighbor agents. For practical purpose, we assume that actuator limitation exists, and require that the consensus be achieved among the agents at a specified convergence rate. By using an appropriate coordinate transformation, we reduce the consensus problem on hand to solving a strict matrix inequality, and then propose to use the homotopy based method for solving the matrix inequality. It turns out that our algorithm includes the existing graph Laplacian based algorithm as a special case.     

In situ synthesis of bone‐like hydroxyapatite/polyamide 6 nanocomposites

BACKGROUND: Polymer/hydroxyapatite (HA) nanocomposites have emerged in recent years as a new class of biomaterials that can be used as artificial bone. Compared to pure HA or HA‐based bioceramics, and metallic implants, they exhibit good plasticity, improved toughness and good mechanical compatibility with natural bone. Compared to their microcomposite counterparts and the pristine polymer matrix, they show increased tensile strength and modulus, and enhanced bioactivity. RESULTS: In this study, polyamide 6 (PA6)/nanoscale HA (n‐HA) nanocomposites were prepared via in situ hydrolytic ring‐opening polymerization of ε‐caprolactam in the presence of newly synthesized n‐HA aqueous slurry. The synthesized n‐HA, which is similar to bone apatite in chemical composition, microscopic morphology and phase composition, dispersed uniformly in the composites even if its loading was up to 60 wt%. The PA6/n‐HA composites show a similarity to natural bone in chemical composition to a certain extent. Mechanical tests show that the composites are reinforced considerably by the incorporation of needle‐like n‐HA, and the composites have mechanical properties near to those of natural bone. CONCLUSION: The PA6/n‐HA nanocomposite with high n‐HA content shows a similarity to natural bone in terms of chemistry and mechanical properties. This makes it a possible candidate for biomaterials suitable for bone repair or fixation. Copyright © 2008 Society of Chemical Industry     

攀钢转炉钒渣生产V2O5工艺研究

分析了攀钢转炉钒渣的性质，对焙烧，浸出，沉淀过少各工艺参数对钒回收率的影响规律进行了研究，提出了优化五氧化二钒生产工艺的建议。     

基于恒模算法的DS-CDMA系统下行信号接收机

本文研究多径频率选择性衰落信道下,DS-CDMA系统下行信号检测技术。提出了一种新的基于恒模算法的检测方法。将均衡器的输出投影到一个未使用的扩频序列上,以结果为零作为约束条件,本文分别给出了批处理和自适应的线性约束恒模算法。本文方法克服了常规恒模算法无法保证收敛到期望用户的缺点,并且对周期和非周期扩频系统都有效。仿真结果验证了本文方法具有良好的检测性能,可以在克服信道衰落的同时抑制多址干扰。