Effect of Ni addition on the glass-forming ability and soft-magnetic properties of FeNiBPNb metallic glasses

The effect of Ni addition on the glass-forming ability (GFA) and soft-magnetic properties of an (Fe1-xNix)75.5B14.5P7Nb3 (x=0-0.6) alloy system were investigated. We found that the addition of Ni was effective in allowing the alloy to approach a eutectic point as well as increasing the thermal stability of the supercooled liquid. By increasing the amount of Ni,the supercooled liquid region (ΔTx),the reduced glass transition temperature Trg (Tg/Tl) and the Y parameter [Tx/(Tg+Tl)] increased from 49 to 75 K,0...     

An adaptive handoff management for fault tolerant mobile computing

<正> Due to the mobility of mobile hosts,checkpoints and message logs of the computing process may disperseover different mobile support stations in the checkpointing and rollback recovery protocol for mobilecomputing.Three existing checkpoint handoff schemes do not give well consideration to the efficiency offailure-free process execution and the recovery speed of the failure process at the same time.A dynamicadaptive handoff management of the checkpointing and rollback recovery protocol for mobile computing isproposed in this paper.According to the individual feature and current state of each mobile host,differentimplementations are selected dynamically to complete the handoff process upon the handoff event.Performance analyses show that the proposed handoff management incurs a low loss of performance duringfailure-free and achieves a quick recovery upon the process fault.     

基于泊位坐标的无人船自主靠泊仿真研究

针对神经网络自主靠泊控制器只能完成特定港口的靠泊,而无法拓展到其他没有训练数据的泊位这一问题,提出一种以泊位顶点为原点,岸线为y轴的坐标系(泊位坐标系)。采用泊位坐标系中相对位置来训练神经网络控制器,在V.Dragon-5000航海模拟器中选取集装箱船“银河号”,在大连港进行靠泊训练后,成功将靠泊控制器拓展到没有训练数据的深圳蛇口港与新加波樟宜港。仿真验证了采用新建立的坐标系可以拓展神经网络自主靠泊控制器适用范围,减小训练数据所需的成本。     

Wavelet neural network based waternarking technology of 2D vector maps

A novel lossless information hiding algorithm based on wavelet neural network for digital vector maps is introduced.Wavelet coefficients being manipulated are embedded into a vector map,which could be restored by adjusting the weights of neurons in the designed neural network.When extracting the watermark extraction,those coefficients would be extracted by wavelet decomposition.With the trained multilayer feed forward neural network,the watermark would be obtained finally by measuring the weights of neurons.Experimental results show that the average error coding rate is only 6％ for the proposed scheme and compared with other classical algorithms on the same tests,it is indicated that the proposed algorithm has higher robustness,better invisibility and less loss on precision.     

基于自然语言理解的书本知识获取系统TKAS

利理自然语言理解技术，研究了由书本获取知识的方法，并研制了－个面向领域 的书本知识获取的实验系统ＴＫＡＳ（Ｔｅｘｔ Ｋｎｏｗｌｅｄｇｅ Ａｃｑｕｉｓｉｔｉｏｎ Ｓｙｓｔｅｍ）． ＴＫＡＳ在给定领域中，通过基于自然语言理解来达到有效的正文知识的获取，并用命 题语义网络作为其内部知识表示形式。该系统可作为智能系统开发过程中知识获取的 辅助工具。     

机械故障时序诊断特性研究

本文讨论了采用时序建模方法诊断机械故障时，建模方法、判别函数、数据修正以及信噪比等因素对诊断结果的影响。提出在可以模拟故障工况时，对判为同类的工况数据不必进行修正。对时序诊断结果与频谱分析、灰色关联分析进行了比较。     

一个供教学用的编译程序工具系统

该编译程序工具系统是经对P_4进行拆开,修改,删节,补充之后组成的,主要用于编译程序教学实习方面。本文分为三个部分:1、工具系统的形成;2、工具系统的使用;3、通过一个具体例子进一步说明了对工具系统的使用方法。     

圆形槽波导的另一种分析方法

本文利用矩形剖分的近似方法并借助于Ａ．Ａ．Ｏｌｉｎｅｒ等人得出的有关矩形槽波导的分析结果，建立了圆形槽波导的横向等效网络，根据横向谐振条件得到了该波导结构的色散关系，数值计算结果表明，该方法较为简单，且具有较好的精度，是分析圆形槽波导中主模色散关系的一种有效方法。     

关于同余式nσ(n)≡m(modφ(n))

对任给定正整数m，证明了当4トm时同余式nσ（n）≡m（modφ（n））的解数有限。     

基于MC算法的螺旋CT扫描数据的三维重建

在Marching Cubes(MC)算法的基础上，针对螺旋CT扫描数据的特点，提出一种改进的三维表面的快速绘制方法。通过使用体元描述表，并且对体元数据进行二值化处理，简化了数据，在绘制过程中，根据形体拓扑结构，优化了体元内部的等值面形成算法，提高了三维重建的速度和质量。