BLOG中的RSS技术探究

BLOG在当今社会的使用越来越广泛,而在BLOG中的浏览技术RSS在近年来也迅速发展,越来越多的Web站点为用户提供基于RSS的浏览方式．文中对RSS技术的各个方面做一个综述,分析了RSS的由来及发展状况;介绍了RSS技术的工作原理、RSS阅览器以及RSS的联合聚合．     

RSS技术及其在图书馆信息服务中的应用

RSS是一种新兴的信息推送技术。本文介绍了RSS技术的概念、发展、特点以及元素定义,阐述了RSS技术在图书馆信息服务中应用的几个方面。     

基于Java开源类的RSS技术实现

RSS技术运用“推”信息的方式，极大地提高了信息的时效性和可用性，是构成web2．0的新技术之一。剖析了RSS技术原理，通过对Java开源类库RSS and Atom Utilities的再开发，提出了基于Java开源类的RSS技术实现方案，并给出了一个实现的范例。     

信息抽取技术在LBS中的应用

由于LBS系统的终端设备处理能力较低，显示屏幕较小，再加上无线数据网络带宽不足，因此无法浏览整个Web网页。采用信息抽取技术可以将用户感兴趣的信息提取出来，再发送给用户终端，有效地解决上述问题，信息抽取技术将是LBS系统中的一项重要应用。提出了一种基于信息抽取的从删．到WML的页面转换方法，首先标记少量的Web网页形成样本实例集，采用归纳算法生成信息抽取规则；其次应用抽取规则和模式匹配来处理结构和风格类似的Web页面；最后将抽取结果转换为WML页面。开发了原型系统，通过对实际数据源的抽取，验证了此方法的有效性。     

基于P2P的RSS内容分发系统研究与实现

分析了基于C／S模式的RSS系统存在的问题,设计并实现了一种基于非结构化P2P网络的低成本、可伸缩的RSS内容分发系统：PPRSS。通过P2P技术实现对等节点间的直接数据交换来减轻发布节点的压力,使任何接入因特网的计算机不需要付出额外成本即可发布RSS信息,并通过数字签名保证RSS内容安全。     

浅谈计算机网络未来的发展趋势

我们已经现在进入被称为web 2.0的网络时代。这个阶段互联网的特征包括搜索，社区化网络，网络媒体（音乐，视频等），内容聚合和聚集（RSS），mashups（一种交互式Web 应用程序），以及更多。目前大部分都是通过电脑接入网络，但是，未来我们将从移动设备（如Iphone）和电视机（如Xbox Live 360）上感受到更多登陆网络的愉悦。     

基于XML的Web查询功能的实现

Web信息查询是Web应用领域中的一个重要研究课题．介绍了XML数据模型，并从建立XML数据源、Web查询过程及查询实例3个方面，讨论了XML在Web查询中的应用．     

RSS技术在图书馆网络信息采集与服务中的应用

简要介绍了RSS的技术特点和基本功能及其在各行业的应用现状,详细论述了RSS技术在图书馆网络信息采集和网络信息服务工作中的具体应用,以及与传统服务方式的融合。     

网络环境下数据挖掘若干问题的述评

在深入分析Web上数据信息的特点的基础上，着重从功能的角度给出了一种用于Web数据挖掘的过程框架，并介绍了伴随数据挖掘的进行，相应的数据信息从Web数据到知识模式的演进过程。     

Web文本数据挖掘关键技术及其在网络检索中的应用

Web挖掘采用数据挖掘信息处理技术，从Web信息资源中发掘用户所需信息。本文在分析Web文本信息特征的基础上，揭示了Web文本数据挖掘的目标样本的特征提取、分词处理与Web文本分类等关键技术，以Google为例讨论了该技术在网络信息检索中的应用。     

滚筒渣与热闷渣基础性能研究

为实现钢渣的高效资源化利用,采用X射线荧光光谱（XRF）、X射线衍射（XRD）、扫描电镜（SEM）、粒径分布、安定性、易磨性等检测方法研究了滚筒法、热闷法处理工艺对钢渣基础性能的影响. 研究表明:滚筒渣和热闷渣的主要化学成分和物相组成相差不大,滚筒渣中硅酸二钙(C₂S)、硅酸三钙(C₃S)和铁酸二钙(C₂F)的质量分数较大,且可以较明显的观察到金属铁粒; 与热闷渣相比,滚筒渣中CaO质量分数较大,而 f-CaO质量分数较少.在2.0 MPa饱和蒸汽下进行压蒸试验发现,在相同粒径范围内,滚筒渣的安定性指数普遍大于热闷渣,安定性优异. 采用水泥试验小磨进行粉磨,得到比表面积随粉磨时间延长的特征曲线. 结果发现,在相同的粉磨时间内,滚筒渣的比表面积均小于热闷渣的比表面积,当粉磨时间超过70 min时,滚筒渣的粉磨效率趋于平缓,而热闷渣继续粉磨到110 min时,比表面积增加15.67%,因此滚筒渣的易磨性较差.粒度筛分与压碎值测定试验结果显示,滚筒渣的粒径大部分集中在3~5 mm,热闷渣主要集中在3~10 mm且粒度分布较均匀; 滚筒渣和热闷渣粗细骨料的压碎值均达到Ⅰ类粗细骨料技术指标,可直接用作粗细骨料.     

认知无线电网络中基于接收信号强度的组密钥提取方案

为了保障认知无线电网络（cognitive radio networks, CRNs）中次用户之间的安全通信,提出一种基于物理层无线信道特征接收信号强度（received signal strength, RSS）的组密钥提取方案。在网络中并非所有次用户都在彼此通信范围内的情况下,该方案利用中继节点实现组密钥的提取,即在链式通信拓扑结构下,组内所有节点将链上除头节点和尾节点以外的其他节点作为辅助中继节点,提取链上所有相邻节点间的RSS测量值。之后,提出一种新的量化方法对提取到的RSS测量值进行量化。首先,给所有RSS测量值找到相应的量化区间;其次,为每个RSS测量值找到相配对的值,使得生成的密钥与多位RSS测量值相关,保证最终密钥生成的随机性;最后,利用格雷码编码对量化后的RSS测量值进行编码。使用MATLAB仿真软件模拟用户在高斯信道中建立组密钥的过程,信噪比在0～30 dB变化,实验结果表明,密钥建立过程中比特不一致率随着组内节点个数增加而增加,随着信噪比的增大而减小。此外,数值计算分析了该方案在不同条件下能够达到的组密钥率,结果表明,该方案的组密钥率随着组内节点个数和信噪比变化所呈现的变化趋势与比特不一致率相反。与现有方案相比,本方案能够大幅地降低用户建立组密钥的通信代价。综上所述,本方案在提高组密钥提取效率和降低用户通信代价方面都具有较明显的优势。     

一种面向室内环境变动的人员目标无源定位算法

现有的基于接收信号强度(RSS)的人员目标无源室内定位算法在定位环境变动的情况下难以兼顾人工工作量、时间消耗和定位准确率。针对这个问题,本文提出了基于迁移聚类和坐标融合的变分自编码器(FusVAE)的室内环境变动下人员目标无源定位算法。在环境变动后,采集少量无标签RSS样本,然后使用本文提出的基于度量学习的半监督模糊C均值聚类(SFCMML)对其进行精确聚类和标签标注,对原有的定位模型进行重训练,只需很小的人工和时间代价就可以使原定位模型在新环境下也具有较高的定位准确率。同时,针对变动后环境下采集RSS样本较少的问题,本文提出了基于坐标融合的变分自编码器(FusVAE),对新环境下的RSS样本进行数据增强,丰富了RSS样本的数量和质量,提高了定位模型的泛化能力。实验结果表明,在环境变动的情况下,本文提出的算法的平均定位准确率可达88.6%,和同领域同类型算法相比,具有较高的定位精度和较好的环境变动适应性,更适用于变动环境下的人员目标无源室内定位问题。     

Activity of reducing steel slag of EAF

Reducing steel slag (RSS) was mainly acquired from five electric-arc furnace (EAF) steelmaking plants (among them, the products of two plants were carbon steel and those of other plants were stainless steel) for research tests. The chemical properties, compound compositions, activities and contents of main expansive compounds were tested. The results showed that the field sampled RSS had a very high crystallinity and hydraulicity with main chemical compositions close to those of Portland cement. It can be known from the study that in case of C/S ratio higher than 2.0, the main compound compositions are C₂S, C₃S, C₂F and f-CaO. However, after the RSS was stored for six months, an obvious variation occurred with potential pre-hydration in RSS, where the SO₃ content was slightly reduced and the compressive activity index was obviously higher than that at the 28th day.     

采用asp.net的RSS信息管理系统的设计

RSS作为现在日趋流行的聚合信息技术,正在被网络所重视和使用.本文就是针对RSS技术利用的现状,采用asp.net编程工具来设计开发RSS信息管理系统,主要论述了RSS技术、DOM应用、XML的操作、.net编程等方面的综合应用来进行设计开发RSS信息系统.     

Slope Stability Analyses of Outang Landslide Based on the Peak and Residual Shear Strength Behavior

Most of the natural and compacted fine-grained soil slopes that are in saturated or unsaturated condition undergo a large deformation prior to reaching failure conditions. Such slopes should be designed taking account of their strain-softening behavior using the residual shear strength(RSS) parameters. In this paper, the slope stability of a recently reactivated Outang landslide near the Three Gorges Dam in China is analyzed based on the RSS parameters of unsaturated soils. In addition, comparisons are provided in the FOS values of slope using both the peak shear strength(PSS) and RSS parameters. Firstly, a series of site investigations of the hydrologic and geologic conditions, ground surface displacements and cracks were described. The PSS and RSS behaviors of the sliding soils derived from a series of direct shear test results performed on saturated and unsaturated soil specimens are summarized.Secondly, a series of slope stability analysis were conducted considering the precipitation and Yangtze River water level variation within a representative period of 7 months, based on the PSS and the RSS properties. In this study, three different scenarios were considered, which include: i) considering only the precipitation with a constant water level; ii) considering only the decrease in water level without rainfall; iii) considering the combination of precipitation and decrease in water level. In each scenario, four steps were included to calculate the values of factor of safety(FOS) at different times. 1) A steady-state seepage analysis was conducted with a constant total head at 525 m on the left boundary and 175 m on the slope surface below the Yangtze River water level. The initial pore water pressures were simulated in the slope under no precipitation and variation of water level. 2) A specific boundary condition was applied on the slope surface to model the precipitation and Yangtze River water level variation. A transient seepage analysis was conducted to calculate pore water pressures at different times based on the initial pore water pressures. 3) The FOS values at different times were calculated by the Morgenstern-Price method taking account of the variation of pore water pressures at different times, using the peak shear strength(PSS) parameters. 4) The last step was repeated replacing PSS parameters with RSS parameters.The RSS parameters were lower than the peak values from laboratory's direct shear test results for the soils in the sliding zones. The reduction in shear strength from peak to residual state under unsaturated soil condition was greater than that for a saturated soil. The FOS decreased almost linearly with time for the scenario in which only the influence of rainfall infiltration was considered. However,the total reduction in the FOS was relatively small. The FOS decreased rapidly at a linear rate with respect to time with a decrease in water level for the scenario in which Yangtze River water level decrease was considered. The FOS reached to a relatively constant value after Yangtze River water level reached the lowest value. The decrease in Yangtze River water level was the dominant factor that contributed to a reduction in the FOS. The FOS was strongly dependent on the development of the phreatic line after the Yangtze River water level reached the lowest value. The FOS calculated by RSS(i.e. FOSR) is less than unity; they were approximately 16%lower in comparison to that calculated by PSS(FOSP). If PSS parameters were used, the slope would still be stable even under the combined influence of precipitation and Yangtze River water level decrease. These results are inconsistent with the field observations. For this reason, the RSS parameters should be taken into account to evaluate reliably the slope stability of the Outang landslide.