接收方预约信道的水声传感器网络MAC协议

为了获得更高的网络吞吐量,更低的端到端时延,设计出了一种适用于分簇网络的水声传感器网络MAC协议,该协议采用接收方建立握手机制,有效的获取邻居节点通信时的状态,动态分配发送时隙,实现数据包以报文序列方式无冲突的到达接收端.仿真结果表明,与同类MAC协议(FERI, RIPT)相比,该协议提高了网络吞吐量,降低了数据丢失率和端到端时延.     

基于CCD技术的外观纸病检测系统

设计了CCD在线外观纸病检测系统,介绍了该系统的硬件组成情况和系统的工作原理、技术指标和软件设计,重点阐述了外观纸病检测系统中CCD技术的优势。     

技工院校“一体化技能双证书”课程模式研究探索

阐述"一体化技能双证书"课程模式对技工院校计算机网络专业教学改革的重要意义,分析当前计算机网络相关职业资格证书存在的问题,把知名行业企业认证培训融合进计算机网络专业一体化教学改革中。     

基于改进FAHP的电力通信网可靠性评估方法研究

论文阐述了可靠性的一般评估方法,在借鉴TMN管理模型的基础上,对电力通信网可靠性进行了分层,构建了可靠性综合评估指标体系.为减少指标体系权重的主观性,提高评估结果的客观性和可信性,提出了一种改进的FAHP综合可靠性评估方法.该方法基于对数最小二乘法(LLSM)进行模糊权重计算,利用限位系数法来实现评估结果的解模糊过程,实例评估验证了该方法的有效性和可行性.最后对电力通信网可靠性的研究方向给出了建议.     

基于Protégé的领域本体构建研究

介绍了领域本体构建的基本流程,目的是为了更好地服务于语义web以及搜索引擎等。主要内容包括本体的概念、分类、功能及本体构建的方法、语言和工具,并以Java领域本体库的构建为例详细阐述了本体的构建过程。     

基于云存储的离线下载系统

数据获取是现代网络应用中的重要组成部分,是几乎所有网络操作的前提。下载工具能够帮助用户更加便捷地获取网络资源。该文提出一个基于云存储的离线下载系统,系统保持离线下载原有特色与优点,并引入云存储解决系统存储空间不足和"秒杀"下载率不高的的问题,利用基于文件存储价值的存储更新策略提高云存储系统的存储效率。双机热备技术的引入,有效提高系统整体可靠性。     

A High-Precision Time Handling Library

An appropriate assessment of end-to-end network performance presumes highly efficient time tracking and measurement with precise time control of the stopping and resuming of program operation. In this paper, a novel approach to solving the problems of highly efficient and precise time measurements on PC-platforms and on ARM-architectures is proposed. A new unified High Performance Timer and a corresponding software library offer a unified interface to the known time counters and automatically identify the fastest and most reliable time source, available in the user space of a computing system. The research is focused on developing an approach of unified time acquisition from the PC hardware and accordingly substituting the common way of getting the time value through Linux system calls. The presented approach provides a much faster means of obtaining the time values with a nanosecond precision than by using conventional means. Moreover, it is capable of handling the sequential time value, precise sleep functions and process resuming. This ability means the reduction of wasting computer resources during the execution of a sleeping process from 100% （busy-wait） to 1-1.5%, whereas the benefits of very accurate process resuming times on long waits are maintained.