基于BP神经网络的铁路货运量预测

在铁路货运量预测中，为改善传统预测方法数据拟合度不高、外推性不强等问题，提出基于BP神经网络技术的货运量预测模型，该模型采用贝叶斯正则化方法以提高神经网络推广能力。实验比较发现，该模型具有较强的自适应性，其拟合、预测结果优于灰色预测模型GM（1，1）和修正指数回归模型，证实了该方法的可行性和可靠性。     

粒子群算法在确定边坡最小安全系数中的应用

基于圆弧滑动面假定，提出了一种用粒子群优化算法(PSO)确定边坡最危险滑动面及其对应的最小安全系数的方法，并以粒子群优化算法为指导，编制了搜索土坡临界滑动面的程序，将粒子群这一新近发明的进化计算技术应用于工程实际。     

公路隧道爆破掘进震动效应研究

根据单孔爆破荷载峰值的大小随距离的衰减关系及药包分散性的影响对多孔爆破荷载进行推导,得到控制爆破下的爆破荷载计算模式,将川本眺万等提出的不连续岸体中的损伤力学理论引入到对隧道围岩中的传播进行了解析法和有限法的数值模拟,得出一些有益的结论。     

一类非共振二阶系统的多重周期解

利用Z2型山路定理获得超二次非共振非自治二阶系统{ü(t) λu (△)F(t,u(t))=0 u(0)-u(T)=(u)(0)-(u)(T)=0 的多重周期解存在定理.     

空间异径三岔管的解析法展开

就空间异径三岔管的解析法展开 ,给出了有关的展开曲线方程 ,以及方程中各个系数的计算公式 ,为数控切割机等现代化设备参与生产实践 ,提供理论依据。     

实时ITS数据抽样技术应用软件的设计与实现

本文介绍了ITS数据抽样技术应用软件的设计与实现的过程。通过Oracle、Access数据库和VB编程语言等实现了ITS数据抽样算法，包括误差平方和法(SSE)和互验法(CV)。通过对该软件的测试结果表明，得到的最佳抽样日精度很高，软件的实用性很强。     

浅谈怀化铁路枢纽解编系统改造方案

针对怀化铁路枢纽解编系统的现状，分析其存在的主要问题，结合路网规划和既有铁路设施，提出解编系统的改造方案。     

DESIGN OF A DIGITAL SIGNATURE SCHEME BASED ON FACTORING AND DISCRETE LOGARITHMS

Objective Focusing on the security problem of authentication and confidentiality in the context of computer networks, a digital signature scheme was proposed based on the public key cryptosystem. Methods Firstly,the course of digital signature based on the public key cryptosystem was given. Then, RSA and ELGamal schemes were described respectively. They were the basis of the proposed scheme. Generalized ELGamal type signature schemes were listed. After comparing with each other, one scheme, whose Signature equation was (m r)x=j s modФ(p) , was adopted in the designing. Results Based on two well-known cryptographic assumptions, the factorization and the discrete logarithms, a digital signature scheme was presented. It must be required that s“ was not equal to p‘q“ in the signing procedure, because attackers could forge the signatures with high probabilities if the discrete logarithms modulo a large prime were solvable. The variable public key “e“ is used instead of the invariable parameter “3“ in Ham‘s signature scheme to enhance the security. One generalized ELGamal type scheme made the proposed scheme escape one multiplicative inverse operation in the signing procedure and one modular exponentiation in the verification procedure.Conclusion The presented scheme obtains the security that Harn‘s scheme was originally claimed. It is secure if the factorization and the discrete logarithms are simultaneously unsolvable.     

基于模糊算法的埋弧焊控制系统

以埋弧焊 (SAW )作为控制对象 ,在综合考虑了焊接电流、电弧电压以及送丝速度要求的基础上 ,采用模糊控制算法来分别控制电源的恒流外特性和恒压外特性 ,使本系统具有等速送丝和变速送丝两种焊接特性