Application controlled caching for web servers

Today's web servers must have the ability to deal with large data sets, and their performance mainly depends on the control mechanism of the disc cache. Though the cache replacement algorithms in operating systems generally perform well, application-specific policies can often perform much better. In this paper, we present the application-controlled caching in user space (ACCUS) mechanism for web server disc caching. With this mechanism, an application can schedule the service requests based on the cache status of the requested files to improve its performance so that the system can gain a high parallelism of CPU processing, networking I/O and disc I/O. An application can service the cached files with a higher priority to the ones not cached, which helps reduce the latency caused by disc I/O blocking. Meanwhile, the application can enforce a policy for domain-specific cache management to obtain a higher cache hit ratio. ACCUS is implemented in two web servers of different models, Flash and userver. Despite the great differences in architectures, the empirical results show that both servers can achieve high throughput under heavy workloads with ACCUS enabled. Performance analysis for two other typical web servers, Apache? and Zeus Web Server are also conducted and the results indicate that ACCUS can achieve significant improvement in performance.     

云计算在中小企业信息化中的应用策略

信息化是当代企业增强自身竞争力的必要手段,占企业总量90％以上的中小企业是我国国民经济的重要组成部分,其信息化建设在一定程度上决定着中国经济的发展前景.近年来,众多中小企业也纷纷开展了信息化建设,但传统的信息化建设模式难以满足中小企业在个性化、多样性、灵活性及经济性等方面的需求,导致信息化还处在较低水平.而云计算的出现提供了一种全新的信息化建设模式,企业可以按需使用各种IT服务,充分满足了中小企业信息化建设的需求.通过对云计算及中小企业信息化需求特点的研究,分析了云计算对中小企业信息化建设的适用性,并给出了中小企业借力云计算进行信息化建设的对策.     

一种基于无线携能通信的MEC与用户匹配算法

多接入边缘计算（Multi-access Edge Computing,MEC）和无线携能通信可有效提高用户的服务质量和体验。在计算、通信和能量等资源的约束条件下，用户匹配是优化MEC任务卸载时系统效用的重要方法。针对无线携能通信的MEC网络结构，综合考虑用户的需求差异性和多元化能量供给，建立了基于计算资源、传输资源和能量资源的系统效用函数；以系统效用最大化为目标，采用基于多维背包理论的多轮拍卖，提出了一种适用于多用户和多网络边缘服务器的用户匹配算法。仿真验证了所提用户匹配算法的有效性与可靠性，结果表明所提匹配算法可优化系统资源配置，有效提高整体性能。     

基于边缘计算的视频背景重建方法

基于当前物联网技术的应用趋势,论文研究了一种基于边缘计算的视频背景重建的方法,结合城市道路交通车流量实时监测的应用需求,通过实际的车流量视频数据进行算法的验证。同时,论文基于OpenCV构建边缘计算机器视觉应用引擎,将基于视频背景重建的算法向嵌入式实时处理系统移植,从而探索出通用机器视觉算法在边缘计算侧实现功能应用的方法,使得以模块化、软硬件系统低耦合度思想研发机器视觉应用成为可能。     

云计算技术在电子数据调查与取证中的应用研究

随着云计算技术的发展,其已经在许多领域得到广泛的应用。通过云计算技术可以解决传统计算机取证所存在的存储量不足、分析不及时等一些缺陷,因为云计算技术具有高效计算、虚拟化运行等特点,基于这些特点可以扩大证据的储存、提高设备的利用率以及缩短取证时间等等。文章介绍了云计算的特点及电子数据取证的内涵,分析了云计算对电子数据取证的意义,并进一步对云计算在电子数据取证中的应用进行了分析与研究。     

基于云平台和struts技术的考场助手

本文介绍了云计算技术和struts技术,分析了当前考试相关的各个环节可能出现的问题和不足,设计并实现了考场助手系统以解决考场中可能发生的问题,并对该考场助手系统做了详细的介绍。     

智能电网中的云计算机应用及安全研究

文章首先讨论了智能电网中基于云计算的病毒防护和数据灾备两种云计算应用模式,然后介绍了智能电网面临的信息安全风险及其特征,最后阐述了智能电网中云计算的安全风险和相应的解决措施。     

Full‐life‐cycle economics: An evaluation methodology for information technology projects

This article presents a methodology for the examination and evaluation of proposed information technology projects. Through an examination of successes and failures in estimating project costs and benefits, a number of weaknesses have been identified. The areas of “hidden”; costs and intangible (or at least difficult to quantify) benefits have been particularly difficult to estimate. The methodology presented here seeks to retain the strengths of older methodologies, while addressing these identified weaknesses. This methodology, while not a substitute for good judgment, provides a framework for the standardization of economic analysis. As such, it provides both management and clients with a better basis for decisions regarding investments in information technology.     

Interactive Mining of Strong Friends from Social Networks and Its Applications in E-Commerce

Social networks are generally made of individuals who are linked by some types of interdependencies such as friendship. Most individuals in social networks have many linkages in terms of friends, connections, and/or followers. Among these linkages, some of them are stronger than others. For instance, some friends may be acquaintances of an individual, whereas others may be friends who care about him or her (e.g., who frequently post on his or her wall). In this study, we integrate data mining with social computing to form a social network mining algorithm, which helps the individual distinguish these strong friends from a large number of friends in a specific portion of the social networks in which he or she is interested. Moreover, our mining algorithm allows the individual to interactively change his or her mining parameters. Furthermore, we discuss applications of our social mining algorithm to organizational computing and e-commerce     

新兴科技在智慧校园建设工程中的应用

随着社会的进步,新兴科技的不断发展,智慧校园一词逐渐走入人们视野,并掀起了一场革命。本文就新兴科技在智慧校园建设工程中的应用进行了分析和阐述。