时序数据库关键技术综述

随着工业物联网（industrial Internet of things,IIoT）的不断发展,越来越多的设备和传感器开始连接到网络中,产生了大量的时间序列数据（简称“时序数据”）,时序数据爆炸式的增长给数据库管理系统带来了新的挑战：持续高吞吐量数据摄取、低延迟多维度数据查询、高性能时间序列索引以及低成本数据存储.近年来时序数据库技术已经成为一个研究热点,一些学者对时序数据库技术进行了深入的研究,同时出现了一些专门用于管理时序数据的时序数据库,并且已经被应用在多个领域,成为工业物联网中不可缺少的关键组成.现有的时序数据库相关综述侧重于时序数据库的功能和性能比较,以及在特定领域中对时序数据库的选择建议,缺少对时序数据库持久化存储、查询、计算和索引等关键技术的研究,同时这些综述工作出现的时间较早,缺少对现代时序数据库关键技术的研究.对学术界时序数据存储研究和工业界时序数据库进行了全面的调查和研究,凝练了时序数据库的4类关键技术：1）时间序列索引优化技术;2）内存数据组织技术;3）高吞吐量数据摄取和低延迟数据查询技术;4）海量历史数据低成本存储技术.同时分析总结了时序数据库评测基准.最后,...     

时序数据库中的数据挖掘研究

时序数据库中的某个字段的值是随着时间而不断变化的,例如股票价格每天的涨跌、浏览网页的次序等.文章运用数据挖掘的方法来对这些数据库进行趋势分析、时序分析、序列模式挖掘以及周期分析.     

温室农业生产监控组态软件中的实时数据库系统

介绍了在面向温室农业生产监控过程的工控组态软件建设中，实时数据库系统的设计。通过对实时数据库时序一致性的讨论，说明了实时数据库时序一致性的概念和定义，并针对实时数据库系统的特点，分析并实现了实时数据库的结构、存储、功能模块和事务调度．     

时序数据库在风电监控系统中的应用

分析了风电监控系统对海量数据的存储和访问需求,提出了引入时序数据库技术来解决传统数据库在处理海量数据时碰到的存储容量和访问效率方面的问题.所采用的时序数据库和关系数据库相结合的解决方案,在满足海量数据存储和访问需求的同时,很好地解决了数据模型的描述和存储问题.介绍了基于时序数据库开发的一些风电高级应用.     

基于小波技术的网络时序数据挖掘

网络安全日志数据库是一种历史数据，对它的分析具有十分重要的实际价值，作为一种时序数据库，针对它的信息挖掘已研究出许多方法。该文提出了一种新的对此类时序数据库的信息挖掘方法，利用小波变换多分辨率分析的方法对信号化后网络安全日志数据库中的数据在不同的时间尺度上进行分析和信息挖掘，从中提取出单位时间内网络受到攻击次数的时间周期规律，并对这种方法的分析特性进行了阐述，而且利用小波阈值重建的方法对原始信号数据进行去噪处理，收到了良好的效果。     

基于J2EE的电子商务系统的设计

基于J2EE架构的分布式体系结构的思想模式,设计开发了网上购物电子商务系统。阐述了系统的用例分析、时序分析,以及模块设计及数据库设计。     

基于时序数据的模式发现算法研究

数据库中的知识发现是人工智能领域的一个重要课题.本文针对时序数据中复杂模式的问题,提出了一种新的时序序列模式的逻辑表示法,并设计出一种新的时序序列建模算法.     

主动数据库中的时序逻辑

ECA主动规则中的“条件”通常描述主动数据库的当前状态或状态转换,表现为一个或一组查询语句。但是经常还会遇到基于数据库一系列状态演变过程之上的查询要求,这时不能使用平常意义上的条件来表示。文章基于过去时序逻辑,提出了一种说明时序条件的语言,可以对数据库基于时间状态的演变的过程进行监控,从而增强了主动数据库中规则语言的表达能力。     

基于时序数据的模式发现算法研究

数据库中的知识发现是人工智能领域的一个重要课题,该文针对时序数据中复杂模式的问题,提出了一种新的时序序列模式的逻辑表示法,并设计出一种新的时序序列建模算法。     

基于时序逻辑的时序数据库中知识发现方法

知识发现是一个众多学科诸如人工智能、机器学习、模式识别、统计学、数据库和知识库、数据可视化等相互交叉、融合所形成的一个新兴的且具有广阔应用前景的领域。目前国际上对知识发现的研究与开发进展很快。众多现实世界(如天气预报、电信、金融)的数据库中数据都是随时间变化的,即数据具有时序性。目前,时序数据库中的知识发现问题正逐渐引起KDD研究者的兴趣。本文首先给出时     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

Call for Papers The 6^th International Conference on Grid and Cooperative Computing

Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

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