基于Web数据挖掘的高校教育资源服务平台

本文根据Web数据流的动态性、连续性和实效性的特点,分析和挖掘不同类型的数据,成立样本库,将分类后的数据用相应的流算法进行处理,构建Web数据流高校资源服务平台.高校资源服务平台分为用户应用服务层、数据资源挖掘层、数据库提供层,通过自下而上数据的分析处理,实现高校资源应用资源服务,提高高校网络资源的有效利用.     

基于SEM的气象服务公众满意度测评模型

文章在传统顾客满意度测评模型(ACSI)的核心概念和架构的基础上,结合气象服务独特的特点,对其进行了修改和更新,构建了气象服务公众满意度测评的结构方程模型。并进行了相应的实证研究。通过问卷调查获得数据,运用SPSS和SAS等统计软件进行检验,经过一次修改得到较好的拟合模型,在研究分析的基础上给出相应的结论和建议。     

面向云计算的业务支撑系统数据架构实施策略

首先从纯理论角度介绍云计算的概念及云计算的些应用,重点分析了运营商云计算的现状,初步探讨了运营商建设云计算架构策略的关键点;对运营商实施云计算策略的关键点：数据统一策略和数据服务策略进行了介绍;对数据统策略,主要从数据模型层面进行统,对于数据服务策略主要是进行分层设计的思路。     

关于IP数字电视前端的新思考

三网融合促进广电运营商由单向广播业务向双向互动业务转变,广电运营商与电信运营商在业务上同质化发展,形成交叉和竞争,业务内容的相近和相同驱使双方在网络结构上相互渗透。近几年来广电运营商根据新业务的需求,在网内引入互联网技术,使传统ASI前端向IP化前端过渡,以打破ASI前端在业务拓展方面的限制,不断探索IP前端下增值业务的发展,并不断挖掘IP前端在新的市场环境中所能起到的作用,阐述IP前端在技术上的优势并讨论其对广电运营商平台建设和对新业务的有力支撑。     

一种区分服务模型及其在三层交换机的实现

服务质量（QoS）是用来定义网络给不同形式的流量提供不同级别的服务保障的能力.当前服务质量的体系结构和模型有多种,本文参照RFC2474、RFC2475 标准,提出了一种新的服务质量-区分服务（Diffserv）应用模型,该模型包括：流量的分类器、计量器、标记（或重标记）器、丢弃器和调度器等模块, 其中对于核心模块-调度器, 提出基于最大延迟的加权轮转调度（WRR-MBD）算法,同时给出区分服务模型在3 层以太网交换机的实现方法.通过网络测试分析仪对3 层交换机QoS 性能进行测试,得出在WRR 调度策略下,不同优先级数据包的丢失率基本按所设置的权重比例进行分配,从而避免了严格优先级（SP）调度存在的低优先级队列“饥饿”的现象.     

Recent optimization models and trends in location,relocation, and dispatching of emergency medical vehicles

Over the past 10 years, a considerable amount of research has been devoted to the development of models to support decision making in the particular yet important context of Emergency Medical Services (EMS). More specifically, the need for advanced strategies to take into account the uncertainty and dynamism inherent to EMS, as well as the pertinence of socially oriented objectives, such as equity, and patient medical outcomes, have brought new and exciting challenges to the field. In this context, this paper summarizes and discusses modern modeling approaches to address problems related to ambulance fleet management, particularly those related to vehicle location and relocation, as well as dispatching decisions. Although it reviews early works on static ambulance location problems, this review concentrates on recent approaches to address tactical and operational decisions, and the interaction between these two types of decisions. Finally, it concludes on the current state of the art and identifies promising research avenues in the field.     

HIAWSC： An Immune Algorithm Based Heuristic Web Service Composition Framework

The introduction of of web services has led to web service composition being a focus of many researchers. Composing web services using workflows is seen as the most realistic method from an industrial viewpoint. Amongst other method, the use of natural computing methods has been proposed previously to automate web service composition. The need for a fast response when computing the most suitable sequence of services is addressed in this paper. In particular, we propose a novel heuristic immune algorithm with an efficient encoding and mutation method. The algorithm involves two steps： an immune selection operation, which is maintaining antibody population diversity and the clonal selection. The use of a vaccine during the evolution provides heuristic information that accelerates the convergence. Our experimental results illustrate that the proposed heuristic immune algorithm is very effective in improving the convergence speed. We also provide a schema analysis for this method.     

Metrics in Sharing Video Relationship-Networks

At present the video sharing service has gradually became one of the Internet killer applications. It is crucial to the service providers that understand the intrinsic nature of Sharing video relationshlp-networks （SVRNs） formed by video related list. This paper investigates the relationships between sharing videos using complex networks theory. New metrics are introduced to model and characterize the SVRN from topological view. Through extensive study on YouTub% a set of key findings are revealed. The results show that the node in- degree of SVRNs follows the power-law distribution and its entropy remains stable over time. The topology also exhibits an assortative property and obvious clustering phenomenon. But the rich-club phenomenon is not evident compared with the Internet AS-level topology. This research will enable the service providers to optimally plan and operate their video-based services.     

Quality perception when streaming video on tablet devices

The proposed work aims at analyzing the quality perceived by the user when streaming video on tablet devices. The contributions of this paper are: (i) to analyze the results of subjective quality assessments to determine which Quality of Service (QoS) parameters mainly affect the users’ Quality of Experience (QoE) in video streaming over tablet devices; (ii) to define a parametric quality model useful in system control and optimization for the considered scenarios; (iii) to compare the performance of the proposed model with subjective quality results obtained in alternative state-of-the-art studies and investigate whether other models could be applied to our case and vice versa.     

Dynamic connection provisioning with shared protection in IP/WDM networks

Internet protocol (IP) traffic connections arrive dynamically at wavelength‐division multiplexing (WDM) network edges with low data rates compared with the wavelength capacity, availability, and quality‐of‐service (QoS) constraints. This paper introduces a scheme to be integrated into the control and management plane of IP/WDM networks to satisfy the availability and QoS required for IP traffic connections bundled onto a single wavelength (lightpath) in WDM networks protected by shared‐backup path protection (SBPP). This scheme consists of two main operations: (i) routing multi‐granular connections and traffic grooming policies, and (ii) providing appropriate shared protection on the basis of subscribers’ service‐level agreements in terms of data rate, availability, and blocking probability. Using the Markov chain process, a probabilistic approach is developed to conceive connection blocking probability models, which can quantify the blocking probability and service utilization of M:N and 1:N SBPP schemes. The proposed scheme and developed mathematical models have been evaluated in terms of bandwidth blocking ratio, availability satisfaction rate, network utilization, and connection blocking probability performance metrics. The obtained research results in this paper provide network operators an operational setting parameter, which controls the allocation of working and backup resources to dynamic IP traffic connections on the basis of their priority and data rate while satisfying their requirements in terms of bandwidth and availability. Copyright © 2013 John Wiley & Sons, Ltd.