云環(huán)境中的移動(dòng)文件存儲(chǔ)和時(shí)空數(shù)據(jù)分析關(guān)鍵技術(shù)研究
[Abstract]:Cloud computing is an important area of vigorous development in recent years. There are many challenges in mass data storage, management and analysis in cloud computing environment. Access to spatio-temporal data storage and application analysis have become an important direction of data research in cloud environment. On the one hand, with the popularity of personal digital terminals, mobile devices are bound to become digital. Data generated by mobile devices are often spatio-temporal. How to provide a convenient storage and access mechanism for massive spatio-temporal data for mobile devices is a key issue for data management in cloud computing environment. How to provide accurate and efficient application analysis capability for spatio-temporal data is another key problem of data management in cloud computing environment. In this paper, spatio-temporal data management and data analysis are deeply studied, mainly to solve the problems of inefficient access to heterogeneous cloud storage resources by mobile devices, inconvenient use, and to overcome the over-use of spatio-temporal data. The research work and innovation of this paper are as follows:1.
(1) a seamless unified access method for heterogeneous cloud storage service based on file system is proposed. Wukong.
At present, different cloud storage services have different access interfaces. Due to the lack of a unified interface for seamless access to various cloud storage services, spatio-temporal data applications can not directly access and use back-end cloud storage data without modification. File system is a widely supported data usage interface by applications, encapsulating various kinds of data with file system interfaces. Cloud storage services can guarantee direct access to heterogeneous cloud storage services by applications. In this paper, a seamless and unified access method for heterogeneous cloud storage services based on file system, Wukong file system, is proposed for the first time. Wukong realizes the transformation from cloud storage access interface to file system interface by using the interface encapsulation technology based on bridge mode to ensure transparent access to cloud storage services by spatio-temporal data applications. The installation optimization technology reduces the requirement of the system to the network environment and guarantees the effective access to cloud storage services by mobile devices in different environments.
(2) a cross file synchronization mechanism for multi data views is proposed, EaSync..
Because of the popularity of personal digital devices, people often have multiple devices. In the process of collecting data, the data between devices can be used to assist each other. For example, the devices can use the collected GPS data to correct the map data, and can also use the map data to further improve the collected GPS data. Therefore, transparent data synchronization services between multiple devices can provide better support and protection for spatio-temporal data applications. However, due to different device uses and processing capabilities, various devices need and can process different sets of files (i.e. data views), how to provide heterogeneous data views for multiple devices This paper proposes a cross-device file synchronization mechanism, EaSync.EaSync, which supports multi-data views to ensure consistency of data access across devices through a timestamp-based file synchronization mechanism. It realizes the synchronous storage of data between the server and multiple devices. EaSync realizes the hierarchical management of different views by organizing views based on tree structure, and solves the problem of fast updating of data views and large differences.
(3) an interactive real path discovery method based on traditional map matching algorithm is proposed.
Intelligent Transportation System (ITS) is becoming more and more important in social life with the increasing demand for various kinds of traffic information services. Constructing an effective ITS relies on a large number of GPS spatio-temporal data, while the original GPS data has the problem of low accuracy. Map matching algorithm is a common method to improve the accuracy of data, but the traditional map map. TruthFinder, an interactive real path discovery method, is proposed in this paper, which combines manual evaluation and adjustment with traditional map matching algorithm to accurately extract real path information from historical track data and solve the real path of traditional map matching algorithm. By analyzing the cost model based on the statistics of user's operation times, this paper proposes the optimization strategy of map matching algorithm, such as autonomous selection and effective avoidance of human error, to realize the fast generation of large-scale real paths. The evaluation and adjustment cost of manual operation improves the discovery efficiency of real path.
(4) put forward parallel index creation and parallel data clustering analysis method for spatiotemporal data.
With the continuous growth of spatio-temporal data, the existing index creation methods and clustering analysis algorithms can not deal with the current huge data set. For large-scale spatio-temporal data, index creation and clustering analysis is a major problem in massive spatio-temporal data mining. According to the clustering analysis method, through the parallel processing framework based on MapReduce model, this paper realizes the bottom-up packing of spatio-temporal data index creation, and solves the problem that traditional index creation methods face the massive spatio-temporal data, such as limited main memory capacity, long processing cycle and even unable to process. An clustering analysis algorithm solves the problems of data partitioning and local clustering and merging in large-scale spatio-temporal data clustering analysis, and provides a technical basis for large-scale spatio-temporal data processing. The experimental results show that our parallelization method has good scalability while guaranteeing the performance of data processing, and solves the problem of large-scale data. The complexity of the main memory and the long processing cycle caused by the large computation complexity.
Through the above four aspects of research, we provide a strong technical support for mass data storage, management and analysis in the cloud computing environment.
【學(xué)位授予單位】:國防科學(xué)技術(shù)大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2013
【分類號(hào)】:TP333;TP311.13
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