虚拟现实下网络实验室英语学习情景交互识别

为了解决当前英语数字网络实验室中所缺少的真实情景交互性,引入虚拟现实技术中的视景生成技术,在视景生成过程中利用集合变换矩阵来完成三维图像转换;实验室的网络架构采用B/S结构,功能结构分为实验应用层与协作工作层,并根据用户协作交互需求分析进行实验室多用户访问的管理设计,实现英语数字网络交互实验室的最终建设。实验结果表明,体验用户对所建设英语数字网络交互实验室的交互性与易用性评价均值与目标值差值极小,用户体验满意度较高,且实验室的交互识别过程耗时较短、运行稳定性较高且负载能力较强。     

移动群智感知融合数据隐私保护方法

感知融合数据包含用户日常行为习惯和生活轨迹等敏感信息,需要进行有效的隐私保护,针对传统方法存在无法准确衡量用户与位置关系,导致通信开销过大的问题,提出一种基于数据中台技术的移动群智感知融合数据隐私保护方法。将感知融合数据整合上传到数据中台,利用数据中台技术提取属性信息确定隐私敏感等级,构建数据隐私保护算法。实验测试表明,提出的方法隐私保护水平、数据精确度、数据完整性上具有较好的效果;冗余数据明显减少,降低了数据通信量,说明通信开销性能更好,可应用于实际移动群智感知应用中。     

Numerical simulation for rheological characteristics of alternating distribution of soft and hard rock layers

The difficulty of selecting appropriate rheological model and parameters for the alternating distribution of soft and hard rock layers was often encountered due to the unhomogeneity, discontinuity and anisotropy of rock mass. The Burgers and generalized Kelvin models were applied to the soft and hard rock respectively and the rheological parameters were obtained based on the method of optimum separation. By using the simulated code FLAC^3D, the stability of surrounding rocks of a certain underground plant was analyzed. The effect of surface load and weakening the parameters intensity of argillaceous and bioclastic interlayers between soft and hard rock on rheological behavior of layer composite rock mass was investigated. The results indicate that the rheological characteristics of soft and hard rock layer in composite rock mass can be described well with above two rheological models.     

冲击声的固有结构建模及目标识别

将统计数据驱动方法应用于冲击声的固有结构建模,研究了单个冲击信号及冲击声组的时域和频域特征提取方法,并将所提特征用于圆柱壳冲击声和公路空洞检测冲击声分类,获得了良好效果,证实了该方法用于冲击声目标分类的有效程度。     

福建《工业企业能耗数据集中采集导则》通过审定

本刊讯日前,由福建省计量院负责起草制定的《工业企业能耗数据集中采集导则》通过专家组审定,将作为福建省地方标准发布实施。该标准的实施将规范国家城市能源计量中心(福建)的能源计量数据集中采集工作     

探讨在共享公司如何配备财务部数据师

数据管理能力是共享公司实现数据资产化的重要前提,好的数据师团队不但能快速提取所需的信息和答案,还能克服大多数数据瘫痪的场景,剔除可能破坏或歪曲数据结果的异常值,最终得到数据一连串的分析或分析的组合。共享公司可为数据分析团队寻找数据整理师、数据分析师,并设计两类数据师配合,满足财务业务数据分析的需求和期望。     

浅谈KHD.ROMJIG选煤动筛跳汰机设备安装方案

1 设备工作原理与技术数据 (1)KHD.ROMJIG型选煤动筛跳汰机由兖矿集团济宁三号矿引进,德国KHD.Humboldt.Wedag.AG公司生产制造,济南煤炭设计研究院工程设计,东华建设有限公司三十七处施工总承包,施工安装在选煤厂动筛车间 13.100m标高层位置.     

Clustering-based topical Web crawling using CFu-tree guided by link-context

Topical Web crawling is an established technique for domain-specific information retrieval. However, almost all the conventional topical Web crawlers focus on building crawlers using different classifiers, which needs a lot of labeled training data that is very difficult to label manually. This paper presents a novel approach called clustering-based topical Web crawling which is utilized to retrieve information on a specific domain based on link-context and does not require any labeled training data. In order to collect domain-specific content units, a novel hierarchical clustering method called bottom-up approach is used to illustrate the process of clustering where a new data structure, a linked list in combination with CFu-tree, is implemented to store cluster label, feature vector and content unit. During clustering, four metrics are presented. First, comparison variation （CV） is defined to judge whether the closest pair of clusters can be merged. Second, cluster impurity （CIP） evaluates the cluster error. Then, the precision and recall of clustering are also presented to evaluate the accuracy and comprehensive degree of the whole clustering process. Link-context extraction technique is used to expand the feature vector of anchor text which improves the clustering accuracy greatly. Experimental results show that the performance of our proposed method overcomes conventional focused Web crawlers both in Harvest rate and Target recall.     

无线通信在嵌入式系统中的应用讲座(17) 无线技术在水库供水计量中的应用

<正>1概述水是人类生存不可缺少的资源,随着经济的快速发展,工业及农业现代化的发展都离不开大量的水资源。我国的水利工程建设得到了大力的发展,在各省市地区已建立起了各种的水库(如图1)。为加强管理各工农企业的用水情况,避免过量抽取水源,导致水库干涸、河流断流及破坏生态的平衡,各水利行政管理部门建立了各种法律法规来管理水库资源,水库实行有偿供水,避免各供水企业对水资源的浪费,节约水资源。     

用DTS包实现多表关联数据的远程传输

详细阐述如何在应用程序中利用DTS（数据转换服务）技术实现基于Internet的多表关联数据的远程传输的方法,并以C#.NET和SQL Server开发工具为例,描述其实现原理、方法和过程,对管理信息系统的开发和实施都有较高的实用价值。