面向博客的智能网络蜘蛛技术及其系统实现

从博客网站的结构特点出发,抽象出博客网站的链接分级模型,并在此基础上提出了基于蚁群算法的"目录链接-博文链接"自适应采集策略,设计并实现了针对博客网站的智能网络蜘蛛系统.实验表明,采用该策略的系统在采集效率上取得了显著提高.     

Interoperability in semantic Web of Things: Design issues and solutions

The significant improvement in processing power, communication, energy consumption, and the size of computational devices has led to the emergence of the Internet of Things (IoT). IoT projects raise many challenges, such as the interoperability between IoT applications because of the high number of sensors, actuators, services, protocols, and data associated with these systems. Semantics solves this problem by using annotations that define the role of each IoT element and reduces the ambiguity of information exchanged between the devices. This work presents SWoTPAD, a semantic framework that helps in the development of IoT projects. The framework is designer oriented and provides a semantic language that is more user‐friendly than OWL‐S and WSML and allows the IoT designer to specify devices, services, environment, and requests. Following this, it makes use of these specifications and maps them for RESTful services. Additionally, it generates an automatic service composition engine that is able to combine services needed to handle complex user requests. We validated this approach with two case studies. The former concerns a residential security system and the latter, the cloud application deployment. The average time required for service discovery and automatic service composition corresponds to 72.9% of the service execution time in the case study 1 and 64.4% in the case study 2.     

基于SAML的单点登陆系统模型

单点登录技术是一项非常重要的Web安全技术.由于Web服务技术的广泛使用,如何实现适用Web服务特点的单点登录也是一个热点问题,SAML是一项基于XML的交换安全性信息的框架,结合SAML的单点登录可以很好地解决这个问题.阐述了单点登录的基本模式以及SAML的工作原理,讨论了一个基于SAML的企业级Web服务系统模型.     

弧厚偏差对发射药燃烧残渣形成的影响

为研究弧厚尺寸偏差对发射药燃烧残渣形成的影响规律,采用螺旋测微仪量取球扁形发射药弧厚值,并经统计分析得到发射药的弧厚分布规律。利用混合装药形状函数的形式,将弧厚分布规律转化为装药形状函数,再结合经典内弹道模型,模拟研究发射药弧厚偏差与燃烧残渣之间的关系。结果表明:发射药弧厚存在偏差,弧厚值呈正态函数分布,弧厚较大的发射药难以在膛内燃尽将形成燃烧残渣。其中,研究采用的球扁形发射药弧厚偏差为0.10 mm,射击时将有0.2%的发射药不能燃尽形成燃烧残渣;弧厚偏差Δ0.02 mm或期望值μ≥0.29 mm时,射击时会有部分发射药不能燃尽而形成燃烧残渣,并且随着弧厚偏差的增大或期望值的提高,燃烧残渣量增加。     

陕西高校体育网站的现状与对策

采用网络资料检索、文献资料、专家访问等方法,对陕西35所高校体育网站的建设现状进行调查研究.结论:目前陕西高校体育网站的建设还处于初期,对体育网站建设的认识与关注程度淡泊,整体建设工作滞后.因此高校要根据网络功能及高校体育教育环境的特点,充分利用网络信息资源的优势,加快陕西高校体育网站的建设,为普及健全高校体育网络,促进高校网络教育视窗的快捷交流与发展提供参考.     

"信号与系统"在线仿真实验的研究与实现

针对"信号与系统"课程的特点及教学中遇到的问题,分析了Matlab仿真应用于网络环境中存在的不足,提出了基于Matlab Web Server和ASP技术实现在线仿真实验的具体方法,并详细说明了Matlab网络程序设计关键技术.最后给出了信号时域分析在线仿真的程序设计实例.     

一种新型的陷波天线

设计了一种新型的超宽带天线,具有小型化,2.0~10.6GHz的工作带宽及全向性的特点。基于该超宽带天线提出了一种新的实现陷波特性的方法,在天线的地板上添加一个近似半圆的谐振单元,该单元与辐射部分通过一个通孔相连,并且所加的结构对原始超宽带天线的其他特性影响很小。同时给出了该方法的等效电路。仿真与实测结构均表明该超宽带天线驻波比(VSWR)小于2的阻抗带宽是2.0~10.6GHz,天线在5.0~5.9GHz处有明显的陷波特性,很好的覆盖了无线局域网(WLAN)(5.125~5.85GHz)的工作频段。可以解决超宽带通信频段与WLAN间的电磁干扰问题,实现频谱兼容。     

可拓知识空间和可拓知识网格模型(Ⅱ):可拓知识网格

第1部分中已介绍了可拓知识空间定义和相关操作，以及可拓知识空间关联函数计算方法。这一部分进一步建立可拓知识空间语义网、可拓知识网格和可拓知识网格服务，并给出实例和相关的分析讨论。     

Web应用测试模型研究

本文基于模型驱动测试的思想，提出一种Web应用测试模型WANM（Web Application Navigation Model），用于支持测试用例的设计与自动执行．基于WANM设计的测试用例的描述参照U2TP（UML2．0 Testing Profile）标准，使得测试建模、测试用例生成以及测试执行既紧密联系又相互独立，有助于提高测试的充分性与效室．     

The Content Driven Mobile Internet

The development of future mobile networks will be driven, in large part, by content and web based services. In this paper, we examine several performance, scalability and architectural challenges faced by future mobile web applications and how advanced mobile content delivery techniques can address these challenges. We review existing content delivery using a taxonomy that consists of three categories: network scaling, end system acceleration, and content and protocol optimization. While wireline content delivery focuses on network and server scalability, mobile content delivery will likely benefit most from optimizing radio link usage. We also present our ongoing work in this area, which extends the functionality of edge caching to the terminal, uses user interest correlation information to maintain low terminal power consumption and adds a new dimension to radio resource management. This revised version was published online in August 2006 with corrections to the Cover Date.