New insights on survivability in multi-domain optical networks

With the development of intelligent optical networks and the general multi-protocol label switching (GMPLS) technique, the seamless convergence between IP network and optical network is no longer be a dream but a practical reality. Similar to the Internet, current optical networks have been divided into multiple domains each of which has its own network provider and management policy. Therefore, the development of multi-domain optical networks will be the trend of new-generation intelligent optical networks, and GMPLS-based survivability for multi-domain optical networks will become a hot topic of research in the future. This paper provides a comprehensive review of the existing survivable schemes in multi-domain optical networks and analyzes the shortcomings of current research. Based on previous studies, we present possible challenges and propose new ideas to design efficient survivable schemes to guide the future work of researchers in multi-domain optical networks.     

从测角后交最佳点位规律看规范规定之不足

本文分析了文献[1]所总结的测角后交两类公式在取得最佳点位时的规律,指出当前规范对此问题规定之不足.     

基于决定的软件需求工程模型的设计与实现

需求工程是软件工程生命周期的初始阶段，其最终结果是软件需求规约。本文对需求工程的有关内容进行了剖析，设计了一个基于决定的软件需求工程模型ＤＢＳＲＥＭ，并给出了该模型的实现框架。ＤＢＳＲＥＭ的运作需要知识环境，方法工具和实现技术的支持。     

UNIX——一个功能强大的开放式操作系统

本文概述了ＵＮＩＸ系统的产生和发展，探析其基本结构和主要特点；阐述了其应用及发展趋势。     

Eventual Clusterer: A Modular Approach to Designing Hierarchical Consensus Protocols in MANETs

This paper proposes a modular approach to the design of hierarchical consensus protocols for the mobile ad hoc network with a static and known set of hosts. A two-layer hierarchy is imposed on the network by grouping mobile hosts into clusters, each with a clusterhead. The messages from and to the hosts in the same cluster are merged/unmerged by the clusterhead so as to reduce the message cost and improve the scalability. The proposed modular approach separates the concerns of clustering hosts from achieving consensus. A clustering function, called eventual clusterer (denoted as diamC), is designed for constructing and maintaining the two-layer hierarchy. Similar to unreliable failure detectors, diamC greatly facilitates the design of hierarchical protocols by providing the fault-tolerant clustering function transparently. We propose an implementation of diamC based on the failure detector diamS. Using diamC, we design a new hierarchical consensus protocol. As shown by the performance evaluation results, the proposed consensus protocol can save both message cost and time cost. Our proposed modular design is therefore effective and can lead to efficient solutions to achieving consensus in mobile ad hoc networks.     

基于.NET平台的Word数据自动交换管理技术应用

基于.N ET的Word自动化解决方案为企业自动化应用提供了基础平台,本文分析了解决方案的对象模型技术,并对几个常用的Word对象的原理进行了详细介绍,并用实例对其使用方法进行了说明,这对实现Word数据管理自动化具有一定的指导意义。     

Excel VBA在PCB设计辅助信息查询中的应用

针对传统手工查找PCB设计辅助信息效率低、工作强度大的问题,文章运用Excel VBA二次开发功能,实现了PCB设计辅助信息的自动查询。与传统方法相比,本方法能显著提高工作效率,减少工作量,有效保证数据准确性,达到事半功倍的效果。     

计算机网络技术及在实践中的应用

在信息化网络技术飞速发展的新时期,网络技术的载体计算机是必不可少的主角,计算机网络的技术发展水平直接影响着信息化社会的发展。本文将从计算机网络的产生;计算机网络的发展;计算机网络的分类及其体系结构;计算机网络技术的在现实中的应用这几个方面进行阐述,并对未来计算机网络技术的发展及更广泛地实际应用做美好的展望。     

基于DMFT的LFM信号参数估计

线性调频信号是低截获概率雷达常用的一种信号形式,如何在低信噪比情况下检测线性调频信号一直是人们研究的焦点之一.在离散匹配傅里叶变换的基础上对算法进行改进,并利用改进后的算法分别对单分量和多分量线性调频信号进行仿真,仿真结果表明离散匹配傅里叶变换能够在低信噪比情况下比较准确地估计出线性调频信号的参数,不存在交叉项问题.离散匹配傅里叶变换是一种针对线性调频信号有效的参数估计方法.     

现代城市道路综合发电系统

基于经济的高速发展,城市因交通而产生诸多污染与能源的浪费,我们设计了现代城市道路综合发电系统,目的是解决一些污染问题,并合理利用废弃能源,服务城市。这里我们以武汉为例来介绍,其他城市可以以此来作为借鉴。我们的装置主要表现在三个方面：利用风力发电;利用嗓音发电;利用温差发电。本文针对以上三个方面进行阐述。