大数据的未来

<正>大数据应用所带来的价值已经让我们为之兴奋,不过,这并不是大数据应用所爆发出来的最大能量。事实上,目前我们所看到的大数据应用,更多的是对历史数据和一些消费者行为数据进行分析,这样固然能够帮助企业在管理、运营以及营销方面得到提升,但大数据应用的更大价值,并没有得到完全的体现。     

路由器天线有什么区别?

正首先一个误区是:天线越多覆盖范围越大,天线越多信号越强。MIMO(多入多出)也就是多天线的技术是从802.11n协议之后才有的,之前的802.11a,b,g都没有。也就是说首先老一代的路由器(802.11n之前)绝对不会有超过一个以上的天线。而你买了一个最新的3天线支持802.11ac(最新协议)的路由器,如果你的设备是老产品,比如只支持802.11a,b,g的iphone3G,那么很遗憾,那么多天线对你没任何意义。如果硬     

提升网站转化率的四步优化方案

优化一个网站最关键和棘手的事,如何提高整体的转化率,这是任何营销策略里最重要的方面之一,而提升网站转化率是网站综合运营实力的结果。今天,就分享一个简单有效的四步优化方案模型,可以用于建立一个成功的转化优化方案。何为转化率？转化率是指访问某一网站访客中,转化的访客占全部访客的比例。     

基于样本集提取的现场钢材计数研究

针对现有方法实现现场计数的不可行性,提出一种基于提取样本的方式来实现现场环境下钢管计数方法。首先采用GRA和Top-hat联合增强方式改善图像质量,然后通过采用形态学填充的方式寻找标准物体样本集,最后形成权值模板再对梯度图像进行检测、统计计数。实验结果表明,该方法可以很好地在钢管加工过程及出入库中检测出钢管数量,具有较强的实用性。     

基于均值近邻的样本选择算法

提出了一个基于均值近邻的样本选择算法,并且对CMU-PIE人脸数据库数据进行了样本选择,提取关键数据,结合神经网络算法进行了分类实验。实验结果证明,与传统方法相比,该方法在保持了一定的准确率的前提下,能够有效地减少样本集中的冗余信息,同时在时间复杂度方面也有了一定的提升。     

基于曲面形变的三维人脸样本配准

三维人脸样本是人脸识别、人脸动画等领域进行模型训练、算法设计及性能比较的重要数据平台。为了提高三维人脸样本的配准效果和配准速度,提出一种基于曲面变形的三维人脸样本配准方法。该方法通过对标准化样本实施一系列的变形操作来建立原始样本与标准样本之间的对应关系。然后基于该对应关系对原始样本进行配准处理,在处理过程中使用统计方法对样本上的毛刺点和空洞进行修补。实验结果表明,使用该方法可以快速、有效地对不同格式的原始样本进行配准。     

真实感3D人脸表情合成技术研究进展

文中综述了真实感3D人脸表情合成技术的研究进展.根据所采用的技术,将人脸表情合成方法划分为混合样本人脸表情合成、直接表情迁移、基于sketch的人脸表情合成与编辑、基于机器学习的真实感人脸表情合成、高分辨率人脸表情和细节的提取与合成5类,介绍了各类方法的研究现状,并比较了它们的优缺点.最后进行了总结,并对人脸表情合成技术未来的研究方向予以展望.     

直接和间接电合成制备出的高铁酸钾的物理和电化学性能

K2FeO4 powders were synthesized by the ex-situ and in-situ electrochemical methods, respectively, and characterized by infrared spectrum （IR）, scanning electron microscopy （SEM）, X-ray powder diffraction （XRD） and BET. Their electrochemical performances were investigated by means of galvanostatic discharge and electrochemical impedance spectroscopy （EIS）. The results of physical characterization showed that the two samples have simi- lar structural features, but their surface morphologies and oriented growth of the crystals are different, which results in smaller specific surface area and lower solubility of the ex-situ electrosynthesized K2FeO4 sample. The results of discharge experiments indicated that the ex-situ electrosythesized K2FeO4 electrode has much larger discharge capacity and lower electrode polarization than the in-situ electrosynthesized K2FeO4 electrode. It was found from the results of EIS that lower electrochemical polarization might be responsible for the improvement on the discharge performance of the ex-situ electrosynthesized K2FeO4 electrode.     

Failure mode and strength anisotropic characteristic of stratified rock mass under uniaxial compressive situation

A stratified rock mass model was founded by FLAC^3D. The failure mode and anisotropic characteristic of strength for stratified rock mass were analyzed. The analysis results show that the numerical simulation can visually reflect the failure modes of rock samples under different inclination angles β of structural plane. The stiffness of rock sample before peak strength changes in the compressive procedure. With the increase of β, the compressive strength σ _c of rock sample decreases firstly and then increases; when β is in the range of 20°–30° and 80°–90°, σ _c has the largest sensitivity to β; while β falls in the range of 30°–70°, σ _c varies little. When ϕ _j <β<90° (β _j is friction angle of structure plane), the results obtained from numerical simulation and theoretical analysis are in almost the same values; while β⩽ ϕ _j or β=90°, they are in great different values. The results obtained from theoretical analysis are obvious larger than those from numerical simulation; and the results from numerical simulation can reflect the difference of compressive strength of rock samples for the two situations of β⩾ ϕ _j and β=90°, which is in more accordance with the real situation. Foundation item: Project (50099620) supported by the National Natural Science Foundation of China     

产业发展与逐利资本的对抗——透过达娃之争的表象看本质

前言 始于2007年初的达能与娃哈哈争议,一直备受社会各界的瞩目关注。自争议发生以来的个中舆论更是雾里看花,众说纷纭。