Research on QoS Control of Web Server Cluster

HTTP是互联网高速发展的重要里程碑，据统计，目前Web流量已占互联网整体流量的百分之七十以上，应用范畴更遍及信息社会的所有层面。Web服务器的QoS控制于是成为很有价值的研究课题。目前，IntServ和DiffServ是进行网络QoS控制的重要手段，而集群技术成为构建高可用高性能Web服务器的发展方向。然而，现在以负载均衡策略为中心的Web集群系统不能实现区分QoS类型的请求分配。本论文即围绕Web集群的QoS控制展开，旨在为Web应用实现端到端的服务区分和性能保证寻求解决方案。论文首先分析了现有Web服务器集群系统的体系结构和请求分配策略，接着研究在带有请求分配器的集群上运行单个Web站点...HTTP is an important milestone in the rapid development process of Internet. Web QoS control becomes a very valuable research topic. Currently, IntServ and DiffServ are two important approaches for network QoS control and clustering becomes the future technology of constructing high performance Web server. However, the load-balancing Web clusters are not able to implement QoS-aware request dispatc...学位：工学硕士院系专业：计算机与信息工程学院计算机科学系_计算机应用技术学号：20032802

Information Monitoring System Design in Official Business Network

摘要: 政府办公网络可以划分为两种类型:办公内网(涉密办公网) 和办公外网(非涉密办公网) . 前者与互联网物理 隔离,后者则采用逻辑隔离. 两者对信息安全都是高度敏感的,加强对办公网信息的监控显得尤为必要. 办公网存在 的某些安全问题是一般的网络安全系统无法解决的. 本文设计了政府办公业务网信息监控系统的基本框架,内容涉 及受控计算机标志信息的收集、涉密网中违规接入互联网的监测、办公外网中异常占用带宽的监控,并对其中的关 键技术问题提出解决方案. Abstract : There are two types of official business network :private official business network (confidential offi2 cial business network) and public official business network (non2confidential official business network) . The for2 mer must be isolated physically f rom Internet and the latter should be logically isolated. For both ,the information is sensitive. So it’s necessary to intensify monitoring the information of them. This paper discusses the basic de2 sign of the official business network information monitoring system ,covering the information collection of con2 t rolled computers and the monitoring of invalid access to Internet in confidential network and exceptional band2 width in public official business network. Solutions of the key problems are found

A Fast Method of Airport Runway Detection in Aerial Images

提出一种航拍机场跑道的快速检测方法.首先,采用自适应阈值方法对图像进行边缘检测,提取图像,要物体的轮廓后利用线段的长度和图像的梯度相位信息剔除短线条和曲线.然后利用 Hough 变换进行直线检搜索出平行直线对作为机场跑道的候选区域.最后利用机场跑道特征对候选区域进行验证.剔除虚假目标,对ternet 上下载的大量机场航拍图像的实验表明,该方法能够快速准确地检测出机场跑道,且具有较好的鲁棒性够消除背景中诸如云朵等物体的干扰.A method to fast detect airport runway in the aerial images is presented in this paper.Firstly, the binary image is generated via adaptive edge detection,so the main edges of the object in the image are extracted.Next,using the length information of the lines and gradient information of the pixels,the post-processing is applied to eliminate the short lines and reduce the curves.Then the parallel straight lines detected by Hough transform are considered as candidate regions.At last,the candidate regions are verified by the character of runway.Experiments on dozens of the aerial images from Internet indicate that this method can detect the runway exactly and quickly, and it is robust to the disturbance of some background objects such as cloud,国家自然科学基金委员会创新研究群体项目(No.60024301);; 国家自然科学基金项目(No.60175008);; 厦门大学985二期信息创新平台项目资

Design and Implementation of Digital Video Surveillance System Develop Platform

提出了一种数字视频监控系统开发平台的设计与实现,介绍了组成该开发平台的各硬件部件的功能和互联方法,对开发平台中视频采集、视频压缩及网络传输模块的关键技术做了阐述,并给出利用该开发平台进行视频监控系统开发的主要流程和应用实例.该平台实现硬件选型的基本无关性,提供了多种软件模块.几个开发实例的快速构建表明利用该开发平台可以快速高效地进行具有个性化功能的数字视频监控系统的开发.This paper presents a method for designing and implementing the digital video surveillance system develop platform.It discusses the hardware architecture and the key technologies of the video capture、compression and transmission,and,at last,it gives the mainframe of system development and some cases.This platform is less relative with the hardware type,and it supplies abundant interfaces.The experiments indicate that the digital video surveillance system can be developed quickly and efficiently with this platform.国家自然科学基金(60175008);; 国家创新研究群体项目(60024301)资

多孔硅层晶格畸变的X射线双晶衍射研究

利用X射线双晶衍射方法, 对从同一Si(Ⅲ)基片下切割的两块样品, 在不同电解电流密度下, 腐蚀形成的多孔硅层相对于基体硅的晶格畸变进行了分析。这两块样品晶格的畸变明显不同, 其中电流密度较小的样品畸变较大, 其多孔硅层相对于基体硅在垂直和平行于晶体表面的方向上, 晶格有不同程度的膨胀, 搁置一段时间后, 两者晶格渐渐匹配, 但存在着弯曲。两者的(Ⅲ)晶面取向亦有偏差。电流密度较大时多孔硅层较厚, 其双晶反射强度很低, 且弥散地迭加在基体硅反射峰上