大数据的“豆形”可视化及其在资本市场中的应用     

苏咪咪 《科学与管理》2014,(6):3-8

"大数据"时代催发了可视化技术的再创新。"豆形图"以其处理海量数据的超强能力可以直观地展现大数据的结构特征,并为大数据的可视化分析奠定基础。本文首先引入"豆形图"及其可视化大数据的特征,并将其应用于资本市场中典型的金融大数据——超高频数据,构造用于可视化分析的豆形时间序列,分析数据的日内模式和动态特征,为大数据的可视化技术开辟新的方向。  相似文献   

Provider fairness across continents in collaborative recommender systems     

《Information processing & management》2022,59(1):102719

When a recommender system suggests items to the end-users, it gives a certain exposure to the providers behind the recommended items. Indeed, the system offers a possibility to the items of those providers of being reached and consumed by the end-users. Hence, according to how recommendation lists are shaped, the experience of under-recommended providers in online platforms can be affected. To study this phenomenon, we focus on movie and book recommendation and enrich two datasets with the continent of production of an item. We use this data to characterize imbalances in the distribution of the user–item observations and regarding where items are produced (geographic imbalance). To assess if recommender systems generate a disparate impact and (dis)advantage a group, we divide items into groups, based on their continent of production, and characterize how represented is each group in the data. Then, we run state-of-the-art recommender systems and measure the visibility and exposure given to each group. We observe disparities that favor the most represented groups. We overcome these phenomena by introducing equity with a re-ranking approach that regulates the share of recommendations given to the items produced in a continent (visibility) and the positions in which items are ranked in the recommendation list (exposure), with a negligible loss in effectiveness, thus controlling fairness of providers coming from different continents. A comparison with the state of the art shows that our approach can provide more equity for providers, both in terms of visibility and of exposure.  相似文献   

“试验设计与数据处理”课程教学模式创新与实践     

孙玉利  李军  左敦稳 《科教文汇》2014,(31):75-76

本文根据“试验设计与数据处理”课程的性质及教学目标,针对传统教学模式存在的“三多三少”问题,从教学内容、教学方法、教学手段、学生创新实践能力的培养四个方面提出了教学模式创新与实践的思路和方法。  相似文献   

基于信道化接收机的Link-16信号盒维数检测算法研究     

刘博文  杨建波  刘鹏  韩啸 《环球赛鸽科技》2014,(27)

针对美军及北约部队常用的数据链Link-16的性能特点,结合装备应用实际,提出了基于信道化接收机利用分形盒维数对Link-16信号进行检测的算法。首先建立了信道化接收机的模型,并利用仿真软件进行了蒙特卡洛实验,得到了多个虚警概率下的Link-16信号检测概率。在虚警概率为0.1、信噪比为-3dB时,检测概率在60%以上;在相同虚警概率时,在低信噪比环境下,盒维数检测的性能要优于能量检测。  相似文献   

基于数据挖掘技术的Web智能服务算法     

刘友华  闵建宏 《现代图书情报技术》2003,(3):58-59

提出了一种基于数据挖掘技术的Web智能服务算法，它通过对Web数据模型的转换，发现并建立有关用户意向关联知识库，然后再利用知识库中的关联规则来预测用户行为，从而提高了用户浏览器访问速度。该研究内容属目前智能信息检索领域的重要研究课题，具有一定的理论和实践意义。  相似文献   

基于多代理机制的分布式入侵检测系统的研究     

余晓征 《广州广播电视大学学报》2006,6(1):23-26

鉴于当前基于主机入侵检测系统的局限性,使得基于代理的入侵检测技术显得日益重要。讨论从基于主机的入侵检测系统的局限性出发,提出了一种基于多代理机制的分布式入侵检测系统方案,并对入侵检测系统中主机检测器基于多代理的技术进行了详细分析和难点解析。  相似文献   

Unicorn系统中简编记录升级为详编记录的新方法研究   总被引：1，自引：0，他引：1  

葛廷霞  宋雅范 《现代图书情报技术》2001,17(6):17-18

概括介绍了在Unicorn 系统中如何使详编记录在装载时成批替换数据库中的简编记录, 以及这种方法的可行性、应用情况和提高替换率的方法。  相似文献   

Introductory statistics in the garden          下载免费PDF全文

John C. Wagaman 《Teaching Statistics》2017,39(2):52-56

This article describes four semesters of introductory statistics courses that incorporate service learning and gardening into the curriculum with applications of the binomial distribution, least squares regression and hypothesis testing. The activities span multiple semesters and are iterative in nature.  相似文献   

The emergence of the quantified child     

Rebecca Smith 《Discourse: Studies in the Cultural Politics of Education》2017,38(5):701-712

Using document analysis, this paper examines the historical emergence of the quantified child, revealing how the collection and use of data has become normalized through legitimizing discourses. First, following in the traditions of Foucault's genealogy and studies examining the sociology of numbers, this paper traces the evolution of data collection in a range of significant education policy documents. Second, a word count analysis was used to further substantiate the claim that data collection and use has been increasingly normalized through legitimizing discourses and routine actions in educational settings. These analyses provide evidence that the need to quantify educational practices has been justified over long periods of time through a variety of documents and that the extent to which data governs educators’ thoughts, discourses, and actions has dramatically increased during the past century.  相似文献   

一体化地籍空间数据库建设的关键问题研究     

雷虎  黄雷鸣 《科技广场》2007,(9):93-96

由于城乡土地建设的发展需要,建立一个能够统一分类、统一调查、统一统计的城乡一体化信息系统便成为了当务之急。本文从建立城乡一体化地籍空间数据库的几个关键问题展开论述,分析了城乡一体化地籍的管理模式,提出了采用SDE来实现空间信息和非空间信息的统一管理,研究了新旧地类的转换和转换方法。  相似文献