路由选择协议的合理选择

论述了在计算机互联网络系统中信息包的传递和路由选择过程、各种常用路由选择技术的特性,以及不同路由选择协议的合理使用,并介绍了应用实例,说明了在大规模互联网络方案的设计中,选择合理的路由选择协议,对发挥网络的最佳性能、方便网络的维护和升级具有重要的作用。     

Structural Damage Identification via Pseudo Strain Energy Density and Wavelet Packet Transform

Based on strain signals,a new time-domain methodology for detecting the beam local damage has been developed.The pseudo strain energy density (PSED) is defined and used to build two major damage indexes,the average pseudo strain energy density (APSED) and the average pseudo strain energy density rate (APSEDR).Probability and mathematical statistics are utilized to derive a standardized damage index.Furthermore,by applying the analytic relation between the strain energy release rate and the stress intensity factor,an analytic solution of crack depth is derived.For the dynamic strain signals,the wavelet packet transform is used to pre-process measured data.Finally,a numerical simulation indicates that this method can effectively identify the damage location and its absolute severity.     

知识管理及其对档案管理的启示

1对知识与知识管理的新认识1·1对知识与信息的客观审视有关知识和信息关系的论著很多,且观点各异,归纳起来有这样一些观点:一种观点是包含交叉说,认为信息存在于自然界、人类社会、人类思维之中,而知识只存在于人类活动范围内,因而信息包含了知识。根据波普“三个世界“的理论     

INMARSAT—F船站系统安装调试技术研究

阐述了国际海事卫星组织投入运营的INMARSAT～F标准系统电话业务、传真业务、数据业务，研究了该系统的安装调试技术，介绍了F站的启用功能测试方法。随着F站业务的推广和广泛应用，由于其功能完善、可靠性高的特点，F站的应用前景将十分广阔。