基于DNS的异地服务器负载平衡

随着网络的发展,大型网站的访问量剧增,单台服务器已不能满足需要,负载平衡是解决这一问题的有效方式。分析现有的负载平衡方法,提出一种基于DNS的异地服务器负载平衡新方法。该方法通过控制域名解析,将负载分配到各地服务器,其优点在于既可分散各服务器的负载,增强系统的稳定性,又可利用服务器分放各地的网络环境优势,缩短用户和服务之间通信时间,提高服务质量,从而克服现有负载平衡方法的不足。     

基于Java Applet和服务器组件技术的Web机器人遥操作

以开发的一个基于Web的机器人遥操作实验系统为实例,提出了一种使用Java Aapplet与Web服务器端组件技术开发Brower/Server型应用程序的解决方案,并对其中的数据通信机制、安全性等问题进行了讨论。     

Minimization of a Detail-Preserving Regularization Functional for Impulse Noise Removal

Recently, a powerful two-phase method for restoring images corrupted with high level impulse noise has been developed. The main drawback of the method is the computational efficiency of the second phase which requires the minimization of a non-smooth objective functional. However, it was pointed out in (Chan et al. in Proc. ICIP 2005, pp. 125–128) that the non-smooth data-fitting term in the functional can be deleted since the restoration in the second phase is applied to noisy pixels only. In this paper, we study the analytic properties of the resulting new functional ℱ. We show that ℱ, which is defined in terms of edge-preserving potential functions φ _α , inherits many nice properties from φ _α , including the first and second order Lipschitz continuity, strong convexity, and positive definiteness of its Hessian. Moreover, we use these results to establish the convergence of optimization methods applied to ℱ. In particular, we prove the global convergence of some conjugate gradient-type methods and of a recently proposed low complexity quasi-Newton algorithm. Numerical experiments are given to illustrate the convergence and efficiency of the two methods.

Real time video frames allocation in mobile networks using cooperative pre-fetching

In this paper, we study the bandwidth allocation problem for serving video requests in a mobile real-time video player system. One of the main issues to maintain the quality of services (QoS) in mobile video playback is to ensure sufficient number of video frames available at the client side while a video is being played. However, due to the limited bandwidth of a mobile network and variable workload streaming video, this is not easy to achieve in practice. In addition, the communication link between mobile clients and a video server is subject to frequent errors and temporary disconnection. In this paper, we propose to use the notion of buffered bandwidth in addition to the network bandwidth to support real-time playback of videos at mobile clients. Based on this, we designed a bandwidth allocation scheme called Cooperative Pre-Fetching (CP) in which the amount of bandwidth to be allocated to serve a video request depends on the current buffer level of the video at the client relative to the target buffer level of the client. In determining the target buffer level, we consider the errors in communication to the client as well as the other clients who are concurrently served by the system. The buffered video frames at the clients are then used to minimize the impact of error in communications on the overall QoS of video playbacks in the whole system.

A real-time QRS detection method based on moving-averaging incorporating with wavelet denoising

In this paper, a simple moving average-based computing method for real-time QRS detection is proposed. In addition, for signal preprocessing our detection algorithm also incorporates a wavelet-based denoising procedure to effectively reduce the noise level for electrocardiogram (ECG) data. The overall computational structure of the proposed algorithm allows the QRS detection to be performed and implemented in real-time with high time- and memory-efficiency. Algorithm performance was evaluated against the MIT-BIH Arrhythmia Database. The numerical results indicated that the novel algorithm finally achieved about 99.5% of the detection rate for the standard database, and also, it could function reliably even under the condition of poor signal quality in the measured ECG data.     

Linux系统中的ARP的编程实现技术

简要介绍了TCP／IP互联中的地址解析协议（ARP）以及Linux系统提供的基于低层的应用程序开发接口（API）,重点分析了三种访问数据链链路层方法,利用比接口,用C语言开发了ARP协议应用程序,描述了具体编程步骤,并提供了相应的系统调用及程序分析。     

监控网络系统体系结构与路由算法研究

本文在视频监控系统体系结构的基础上讨论了视频监控系统的扩充和互连方法。提出了数字监控系统中自治系统、视频桥和远程视频代理的概念。并以此为基础,给出了对等体系结构下智能监控系统动态视频路由算法的设计与实现方法。     

基于在线识别的机器人动态手眼协调

本文研究了基于在线识别的机器人动态手眼协调,通过视觉在线识别目标的结果来 动态规划机器人的运动,改善了系统的柔性,提高了系统对环境的适应能力．实验证明,文 中所采用的识别算法具有很好的实时性和可靠性．引入语音控制改善了人机交互．     

P2P环境中基于信任度的服务路由系统的研究*

随着网络的飞速发展,基于P2P结构的分布式应用越来越多。P2P系统节点之间的资源高度共享,节点之间的信息搜索和交换往往需要第三方节点进行信息中转,这为信息窃取和信息窜改类型的网络攻击带来了便利。为了提高P2P应用的可用性,提出了在P2P环境下一种新的以可信度为标准的服务路由系统的模型,阐述了模型的设计思想,并详细介绍了其实现机制。对仿真系统进行了性能测试,并对测试结果进行了分析。该模型对于信息窜改、信息窃听及路由功能失效等类型的恶意攻击有较好的抑制作用。