黑龙江省电子政务建设及思考

黑龙江省电子政务"王"字型广域网络结构采用MPLSVPN技术,解决了网络互联互通、允许内部IP地址重复问题,为推广网上应用系统实现信息共享奠定了良好的基础;反思了黑龙江省电子政务建设的一些做法,为兄弟省电子政务建设提供一些可借鉴的模式。     

了解您的管理跨度--科研项目管理方法探索

概要介绍了科学的管理技术——项目管理方法，讨论了管理跨度在项目管理中的重要性，并推荐了如何了解管理跨度的方法。     

油液监测技术及应用

介绍了油液监测技术、发展趋势和应用，指出了油液监测在设备润滑管理中的作用。     

16×10.7 Gb/s 1 600 km普通单模光纤环路传输研究

利用双折射光纤环设计了可调功率均衡滤波器,实现了16路16×10.7 Gb/s NRZ码、超过1 600 km常规单模光纤(SMF)的系统传输及性能测试,信道误码率均小于3×10-5(FEC纠错前).数值仿真并实验研究了对单环长度240 km、损耗超过80 dB的环路16路10.7 Gb/s波分复用(WDM)系统传输的优化.传输7圈后,功率均衡器降低了信道功率不平坦度超过5 dBm.     

有线电视宽带网边界路由系统安全技术研究

提出在当今有线电视宽带网络环境下,从构建安全的边界路由系统出发,研究在边界路由器上采取针对有线电视宽带网内部网络的报文过滤和针对路由系统本身的安全策略,并在某有线电视宽带网络中进行了典型应用,实践证明可以达到事半功倍的网络安全目的.     

An investigation into the effect of various chemical and physical treatments of a South African phosphogypsum to render it suitable as a set retarder for cement

The work describes various physical and chemical treatments to eliminate the deleterious effects of impurities in phosphogypsum on the delayed setting time and impaired strength development behaviour of cement to which it was added as a set regulator. The physical treatments included washing, milling, and ultrasonic treatment of the material, while the chemical treatments dealt with acidic and basic additions to the phosphogypsum during the washing stage. It was found that chemical treatment with a milk of lime solution, which is often recommended in literature, was ineffective in reducing set retardation. Treatment with ammonium hydroxide or sulphuric acid was more effective in this regard. Intergrinding phosphogypsum with slaked lime improved its effectiveness in reducing set retardation, but the use of unslaked lime was less effective and also resulted in marked reductions in compressive strengths. A combined treatment of wet milling phosphogypsum with a lime slurry in a ball mall was derived from these experiments and is recommended for full-scale plant applications.     

身份管理渐行其道

目前人们面临的网络安全问题越来越严峻，不仅包括计算机病毒、垃圾电子邮件等的挑战，对信息资源的有效存取保护要求也在提高。身份管理技术能对用户身份标识进行集中与简化管理，实现安全、简便登录等功能，不但削减了投入和维护成本，还提高了效率，因此近来得到迅速发展。2003年的调查显示，身份管理在安全产品市场增幅达45％；在各企业应用普及率已达到17.9％。但身份管理还需要解决提高单点登录安全性，实施多方可靠数字身份以及本身复杂性等问题。     

Study of the Improvement on Network Management Performance with Mobile Agent

1　IntroductionWiththerapiddevelopmentofInternet,thenetworkisbecominglargerandmorecomplex ,whichcallsformoresophisticatednetworkmanage mentstrategiestobeadoptedinordertoguaranteeadequatelevelsofperformance .Confrontedwiththepresentstatusofnetworkmanagement,manyschol arsmakegreateffortstoinventnewapproachesforthepurposeofimprovingtheperformanceofnet workmanagement.MobileAgenttechnologiesandtheirapplicationtonetworkmanagementaread vancedunderthisbackground .Althoughalotofworkhasstilltobedone ,t…     

Integrated Survivability Strategies of IP／GMPLS／Opticai Multi——layer Network

In last decade,due to that the popularity of the internet, data--central traffic kept growing, some emerging networking requirements have been posed on the today‘s telecommunication networks,especially in the area of network survivability. Obviously, as a key networking problem, network reliability will be more and more important. The integration of different technologies such as ATM, SDH, and WDM in multilayer transport networks raises many questions regarding the coordination of the individual network layers.This problem is referred as multilayer network survivability. The integrated multilayer network survivability is investingated as well as the representation of an interworking strategy between different single layer survivability schemes in IP via generalized multiprotocol label switching over ootical netwnrk     

人工神经网络理论及其应用

简要介绍了人工神经网络的发展过程和基本理论，从神经网络具有自学习功能、联想存储功能和高速寻找优化解的能力三个方面论述了其特点和优越性，详细阐述了在模式识别、信号处理、自动控制、人工智能、自适应的人机接口、优化计算、通信以及其它方面的应用，探讨和分析了其发展前景。