共查询到20条相似文献,搜索用时 15 毫秒
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Correction of phase shift by time-reversal recording is discussed from a unified viewpoint, including considerations of physical realisability, time delay and a systematic approach to practical application. 相似文献
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随着网络数据量的迅速增长,传统数据处理方式的推荐算法已经不能满足互联网发展的需求,为了追求推荐精确性与人性化,协同过滤算法以其更高的推荐满意率逐渐取代其他推荐算法.然而,协同过滤算法推荐的准确程度取决于用户或者物品相似度的计算,成员偏好的多元性使得用户相似度并不能很好的体现用户之间的关联程度.针对这一问题,将CE3:k... 相似文献
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LIU Chuan-chang 《中国邮电高校学报(英文版)》2010,17(3):110-117
The existing search engines are lack of the consideration of personalization and display the same search results for different users despite their differences in interesting and purpose.By analyzing user's dynamic search behavior,the paper introduces a new method of using a keyword query graph to express user's dynamic search behavior,and uses Bayesian network to construct the prior probability of keyword selection and the migration probability between keywords for each user.To reflect the dynamic changes of the user's preference,the paper introduces non-lineal gradual forgetting collaborative filtering strategy into the personalized search recommendation model.By calculating the similarity between each two users,the model can do the recommendation based on neighbors and be used to construct the personalized search engine. 相似文献
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This paper investigates the filtering problems for the discrete time piecewise impulsive system. First, the robust H∞ filtering problem and generalized H2 filtering problem for the discrete time piecewise impulsive system are introduced. Then, linear matrix inequality (LMI) conditions are proposed for the design of H∞ and generalized H2 filters such that the resulting discrete time piecewise impulsive filtering error system is globally stable with guaranteed H∞ or H2 performance. Finally, a numerical simulation is also given to illustrate the effectiveness of the proposed approaches. 相似文献
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Diniz P.S.R. de Campos M.L.R. Antoniou A. 《Signal Processing, IEEE Transactions on》1995,43(3):617-627
An analysis of two LMS-Newton adaptive filtering algorithms with variable convergence factor is presented. The relations of these algorithms with the conventional recursive least-squares algorithm are first addressed. Their performance in stationary and nonstationary environments is then studied and closed-form formulas for the excess mean-square error (MSE) are derived. The paper deals, in addition, with the effects of roundoff errors for the case of fixed-point arithmetic. Specifically, closed-form formulas for the excess MSE caused by quantization are obtained. The paper concludes with experimental results that demonstrate the validity of the analysis presented 相似文献
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A high-output-impedance precision current mirror is implemented in a CMOS dual-output OTA (DOTA) structure by means of an efficient implementation method, which is also applicable to other current-output-based active devices. The new DOTA, when used in a DOTA-C integrator, enables integration at very low frequencies, with a capacitor on the order of several picofarads 相似文献
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协同物流商务信息平台工作流技术研究 总被引:1,自引:0,他引:1
首先对现今物流软件的发展背景进行了分析,给出协同物流商务这一模式的基本概念,然后介绍工作流技术的基本原理;最后探讨了工作流技术在构建协同物流商务平台中的实现方法。 相似文献
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由于在线教育的迅猛发展,个性化教育应运而生,怎样在网络教育当中存储的海量用户数据提取反映用户学习能力水平与有助于提高用户学习水平的有价值信息特别关键,为此商业推荐领域广泛应用协同过滤推荐算法,以便将个性化推荐提供给用户使用者.本文通过在KDD2010比赛当中过滤技术作用发挥,有效结合教育数据挖掘,借助Apache Mahout的Taste组件各种方法,仿真建模教育数据,根据实施的实验反馈取得良好预测效果. 相似文献
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基于差分GPS的战术数据链高精度时间同步 总被引:2,自引:0,他引:2
精确协同作战作为信息化条件下作战形态的必然发展趋势,其对作战平台间高精度时间同步提出了较高的要求。针对该要求,在分析了战术数据链往返计时( RTT)时间同步算法的基础上,提出了卫星导航载波相位差分GPS( DGPS)技术与数据链高精度时间同步算法,利用卡尔曼滤波构建时间同步计算算法模型,实现高精度的时间同步。仿真结果表明该算法可提高时间同步精度到3 ns。 相似文献