合作促发展——国际集装箱运输业的竞争与合作

1 国际集装箱航运市场发展特点及趋势1.1 世界集装箱贸易量增长明显 据Clarkson统计,2003年全球集装箱海运量约8 300万TEU,比上年增长10.6％。     

软件缺陷分类及其度量技术研究

研究了软件缺陷管理的理论和方法，并在对各种软件缺陷分类方法进行深入分析和研究的基础上，针对目前软件工程管理中强调的软件过程改进方法，提出一种针对软件过程的软件分类方法；接着针对缺陷定量分析的需要，提出了一组缺陷度量公式；建立了基于过程的缺陷管理模型。     

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.     

东江大桥病害成因与处治办法

对东江大桥病害形成的原因进行了归类分析,提出了切合实际的处治办法。     

综合勘探技术在包神线罕台川河谷段煤矿采空区调查中的应用

介绍了在煤矿采空区勘察中采用遥感、物探、钻探结合大面积测绘的综合勘探模式,各种技术成果相互验证补充,可以准确查明采空区分布范围,与线路的关系,顶、底板的高程与工程性质以及地下水情况等,为线路方案优化提供可靠的技术资料。     

水泥土搅拌桩在软土地基加固中的施工技术

主要介绍水泥土搅拌桩在浙赣铁路电气化工程（浙江段）第12标段软土地基加固中的施工技术与质量控制、检测。     

浅谈管理会计的发展及应用

本文阐述了管理会计的产生和发展,以及在我国的应用现状和出现的问题、发展特点。     

洋山深水港管理中心工程岩土工程勘察

总结洋山深水港管理中心岩土工程勘察的主要手段和方法,对今后类同工程的岩土工程勘察提出一些建议。     

永连公路k22整体滑坡带病害整治

对永连公路其滑坡带病害的机理进行分析,建议对该处病害的整治方案及办法,并提出边坡整治应注意的问题.     

辙叉焊机的闪光速度控制系统

本文简要介绍了辙叉焊机的基本原理和控制系统组成;详细阐述了采用伺服比例阀控制闪光速度的系统结构,用PLC完成闪光焊的闪光速度控制和焊接过程控制;分析了焊接电流和闪光速度的匹配关系,并采用PID控制和比例控制相结合的算法控制焊接电流稳定;设备使用效果良好,焊接产品通过了各项检测.