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Analyzing Relationships in Terrorism Big Data Using Hadoop and Statistics   总被引:1,自引:0,他引:1  
We used big data software Hadoop in Google News to collect complex high-velocity, high-volume terrorism information. We used big text search to code the factors of interest into nominal fields. We integrated new fields and records into an existing database drawn from other researchers. Our testable hypothesis was that there was a significant relationship between terrorist group ideology and terrorist attack type. Then we used correspondence analysis in SPSS to test our hypothesis. Our hypothesis was supported, so we developed a symmetric model to visualize the hidden relationships between terrorist ideology and attack type. Our purpose was to demonstrate how statistical software methods may be applied in big data analytics. These methods will generalize to other researchers and practitioners. The finding of a significant relationship between terrorist ideology and attack type may generalize to supply chain operations and national security planning.  相似文献
Trends in big data analytics   总被引:1,自引:0,他引:1  
One of the major applications of future generation parallel and distributed systems is in big-data analytics. Data repositories for such applications currently exceed exabytes and are rapidly increasing in size. Beyond their sheer magnitude, these datasets and associated applications’ considerations pose significant challenges for method and software development. Datasets are often distributed and their size and privacy considerations warrant distributed techniques. Data often resides on platforms with widely varying computational and network capabilities. Considerations of fault-tolerance, security, and access control are critical in many applications (Dean and Ghemawat, 2004; Apache hadoop). Analysis tasks often have hard deadlines, and data quality is a major concern in yet other applications. For most emerging applications, data-driven models and methods, capable of operating at scale, are as-yet unknown. Even when known methods can be scaled, validation of results is a major issue. Characteristics of hardware platforms and the software stack fundamentally impact data analytics. In this article, we provide an overview of the state-of-the-art and focus on emerging trends to highlight the hardware, software, and application landscape of big-data analytics.  相似文献
A method for quality assessment of the Global Human Settlement Layer scenes against reference data is presented. It relies on two settlement metrics; the local average and gradient functions that quantify the notions of settlement density and flexible settlement limits respectively. They are both utilized as generalization functions for increasing the level of abstraction of the sets under comparison. Generalization compensates for inaccuracies of the automatic target extraction method and can be computed at multiple scales. The comparison between the target built-up layers and the reference data employs an ordered multi-scale, linear regression computing the goodness of fit measure R2R2. An optimized assessment procedure is investigated in a pilot study and is further employed in a big data exercise. A newly introduced quality metric returns the agreement between automatically extracted built-up from a set of 13605 scenes and the MODIS 500 urban layer, that was found too be as high as 91% for selected sensors. A final experiment attempts a performance increase at lower scales by correlating the target layer with automatically selected training subsets. At 50 m the adjusted R2R2 increases by 3% with a mean squared error improvement of 2% compared to the performance achieved without statistical learning. The experiment suggests that the GHSL assessment at a global scale can be carried out based on limited high resolution reference data of minimal spatial coverage.  相似文献
基于异构云联合的并行化大数据分析服务可以提升性能。然而由于大数据网络传输存在较大时延,原则上必须在并行化水平和大数据分析性能之间进行折衷。鉴于此,提出一种启发式云爆发算法用于并行化大数据分析服务。首先确定联合云中哪些计算结点应该用于大数据分析并行处理,然后将大数据妥善地分配给这些计算结点,确保处理同步完成且性能最优,最后,确定被分配的不同大小数据块在各个结点的计算次序,确保数据块传输尽量在结点上一数据块计算期间完成。与其他负载均衡算法做了对比,结果表明,使用该算法后性能可提升20%~60%。  相似文献
大数据为商业创新和社区服务带来了巨大利益.然而,由于大数据分析技术挖掘出的信息可能超出人们想象,隐私问题备受关注.介绍大数据分析方法及支撑架构,剖析大数据的安全与隐私保护相关技术,并提出一种基于云存储的大数据隐私保护方案.  相似文献
朱美玲  刘晨  王雄斌  韩燕波 《软件学报》2017,28(6):1498-1515
针对伴随车辆检测这一新兴的智能交通应用,在一种特殊的流式时空大数据-车牌识别流式大数据下,重新定义Platoon伴随模式,提出PlatoonFinder算法,即时地在车牌识别数据流上挖掘Platoon伴随模式.本文的主要贡献包括:第一,将Platoon伴随模式发现问题映射为数据流上的带有时空约束的频繁序列挖掘问题.与传统频繁序列挖掘算法仅考虑序列元素之间位置关系不同,本文算法能够在频繁序列挖掘的过程中有效处理序列元素之间复杂的时空约束关系;第二,本文算法融入了伪投影等性能优化技术,针对数据流的特点进行了性能优化,能够有效应对车牌识别流式大数据的速率和规模,从而实现车辆Platoon伴随模式的即时发现.通过在真实车牌识别数据集上的实验分析表明,PlatoonFinder算法的平均延时显著低于经典的Aprior和PrefixSpan等频繁模式挖掘算法,也低于真实情况下交通摄像头的车牌识别最小时间间隔.因此,本文所提出的算法可以有效的发现伴随车辆组及其移动模式.  相似文献
大数据分析平台是开展大数据处理与分析应用所必需的基础设施。文章基于课题组开展大数据分析平台建设的科研成果与实践经验,结合大型企业实施行业应用项目的切身感受,从大数据分析平台设计、主流热点技术、行业应用案例三个方面进行介绍。文章首先分析了大数据分析平台的主要功能和体系架构,然后介绍了大数据分析平台的关键技术,重点介绍了 Spark技术的体系架构及核心组件,最后介绍了大数据技术在大规模制造业、零售业和智能电网三个领域的应用案例。  相似文献
A big data analytics-enabled transformation model based on practice-based view is developed, which reveals the causal relationships among big data analytics capabilities, IT-enabled transformation practices, benefit dimensions, and business values. This model was then tested in healthcare setting. By analyzing big data implementation cases, we sought to understand how big data analytics capabilities transform organizational practices, thereby generating potential benefits. In addition to conceptually defining four big data analytics capabilities, the model offers a strategic view of big data analytics. Three significant path-to-value chains were identified for healthcare organizations by applying the model, which provides practical insights for managers.  相似文献
This article examines how to use big data analytics services to enhance business intelligence (BI). More specifically, this article proposes an ontology of big data analytics and presents a big data analytics service-oriented architecture (BASOA), and then applies BASOA to BI, where our surveyed data analysis shows that the proposed BASOA is viable for enhancing BI and enterprise information systems. This article also explores temporality, expectability, and relativity as the characteristics of intelligence in BI. These characteristics are what customers and decision makers expect from BI in terms of systems, products, and services of organizations. The proposed approach in this article might facilitate the research and development of business analytics, big data analytics, and BI as well as big data science and big data computing.  相似文献
This study develops and validates the concept of Data Analytics Competency as a five multidimensional formative index (i.e., data quality, bigness of data, analytical skills, domain knowledge, and tools sophistication) and empirically examines its impact on firm decision making performance (i.e., decision quality and decision efficiency). The findings based on an empirical analysis of survey data from 151 Information Technology managers and data analysts demonstrate a large, significant, positive relationship between data analytics competency and firm decision making performance. The results reveal that all dimensions of data analytics competency significantly improve decision quality. Furthermore, interestingly, all dimensions, except bigness of data, significantly increase decision efficiency. This is the first known empirical study to conceptualize, operationalize and validate the concept of data analytics competency and to study its impact on decision making performance. The validity of the data analytics competency construct as conceived and operationalized, suggests the potential for future research evaluating its relationships with possible antecedents and consequences. For practitioners, the results provide important guidelines for increasing firm decision making performance through the use of data analytics.  相似文献
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