With the speed gap between storage system access and processor computing, end-to-end data processing has become a bottleneck to improve the total performance of computer systems over the Internet. Based on the analysi...With the speed gap between storage system access and processor computing, end-to-end data processing has become a bottleneck to improve the total performance of computer systems over the Internet. Based on the analysis of data processing behavior, an adaptive cache organization scheme is proposed with fast address calculation. This scheme can make full use of the characteristics of stack space data access, adopt fast address calculation strategy, and reduce the hit time of stack access. Adaptively, the stack cache can be turned off from beginning to end, when a stack overflow occurs to avoid the effect of stack switching on processor performance. Also, through the instruction cache and the failure behavior for the data cache, a prefetching policy is developed, which is combined with the data capture of the failover queue state. Finally, the proposed method can maintain the order of instruction and data access, which facilitates the extraction of prefetching in the end-to-end data processing.展开更多
This article discusses the current status and development strategies of computer science and technology in the context of big data.Firstly,it explains the relationship between big data and computer science and technol...This article discusses the current status and development strategies of computer science and technology in the context of big data.Firstly,it explains the relationship between big data and computer science and technology,focusing on analyzing the current application status of computer science and technology in big data,including data storage,data processing,and data analysis.Then,it proposes development strategies for big data processing.Computer science and technology play a vital role in big data processing by providing strong technical support.展开更多
The device is used for the test on the fuze detonating time according to the initial velocity of the projectile and the altitude and speed of enemy aircraft flight. For the special requirements of the high-speed signa...The device is used for the test on the fuze detonating time according to the initial velocity of the projectile and the altitude and speed of enemy aircraft flight. For the special requirements of the high-speed signal acquisition in the process, the characteristics of the measured signal are analyzed. The system is investigated in chip selection, signal transmission, signal processing, signal storage, post-production PCB design, etc. The appropriate measures and solutions which affect the integrity and accuracy of the signal in each process are proposed. The rules for the layout of the device and wiring are made. The result show that the measurement values are accurate without loss of data.展开更多
Fault frequency of catenary is related to meteo-rological conditions. In this work, based on the historical data, catenary fault frequency and weather-related fault rate are introduced to analyse the correlation betwe...Fault frequency of catenary is related to meteo-rological conditions. In this work, based on the historical data, catenary fault frequency and weather-related fault rate are introduced to analyse the correlation between catenary faults and meteorological conditions, and further the effect of meteorological conditions on catenary oper-ation. Moreover, machine learning is used for catenary fault prediction. As with the single decision tree, only a small number of training samples can be classified cor-rectly by each weak classifier, the AdaBoost algorithm is adopted to adjust the weights of misclassified samples and weak classifiers, and train multiple weak classifiers. Finally, the weak classifiers are combined to construct a strong classifier, with which the final prediction result is obtained. In order to validate the prediction method, an example is provided based on the historical data from a railway bureau of China. The result shows that the mapping relation between meteorological conditions and catenary faults can be established accurately by AdaBoost algorithm. The AdaBoost algorithm can accurately predict a catenary fault if the meteorological conditions are provided.展开更多
期刊论文结构化加工在期刊界已经逐步形成共识,国内期刊平台多采用新版期刊文章标签集(Journal Article Tag Suite,JATS)标准进行加工,但JATS标准仅对数据属性提出建议值,自行拓展空间较大,导致实际的数据加工结果千差万别,数据交换困...期刊论文结构化加工在期刊界已经逐步形成共识,国内期刊平台多采用新版期刊文章标签集(Journal Article Tag Suite,JATS)标准进行加工,但JATS标准仅对数据属性提出建议值,自行拓展空间较大,导致实际的数据加工结果千差万别,数据交换困难重重。本文分析了国内外数字化加工和标准进化的历程及我国在XML结构化数据加工中存在的问题,进一步分析了存档及交换标签集、出版标签集等不同子集的特点,提出既能完整保留论文原始信息,又便于提取各类结构化信息的数据加工及存储解决方案,可以根据需要通过减法转换生成符合各平台标准的数据加工存储格式,从而真正实现一次加工、多渠道投放和传播。展开更多
内部电网地理信息系统(Geographic Information Systern,GIS)数据体量增加,对电网数据存储性能造成了极大的困难,为此,提出一种基于随机森林的电网GIS数据分布式存储方法。以跨域资源共享(Cross-Origin Resource Sharing,CORS)技术在电...内部电网地理信息系统(Geographic Information Systern,GIS)数据体量增加,对电网数据存储性能造成了极大的困难,为此,提出一种基于随机森林的电网GIS数据分布式存储方法。以跨域资源共享(Cross-Origin Resource Sharing,CORS)技术在电网GIS空间信息服务平台中获取的电网GIS数据为基础,根据类区分度数值选择电网GIS数据特征,引入随机森林算法分类处理电网GIS数据,将其合理分发给不同的服务器,采用并行处理手段存储分类数据,从而实现了电网GIS数据的分布式存储。实验数据显示:应用所提方法后,电网GIS数据分类精度达到了96.8%,电网GIS数据分布式存储时间最小值为5.2 s,充分证实了所提方法数据存储性能更佳。展开更多
在当今信息时代,数据的复杂性不断增加,传统的关系型数据库在大规模数据存储和处理方面面临着挑战。非关系型数据库(Not Only SQL,NoSQL)作为一种新的存储和处理数据的方法,受到了广泛关注,并在分布式存储领域取得了显著的成就。文章重...在当今信息时代,数据的复杂性不断增加,传统的关系型数据库在大规模数据存储和处理方面面临着挑战。非关系型数据库(Not Only SQL,NoSQL)作为一种新的存储和处理数据的方法,受到了广泛关注,并在分布式存储领域取得了显著的成就。文章重点探讨基于大数据技术的非关系型数据库分布式存储方法,并通过实验进行评估,发现其在可扩展性和安全性方面具有优势,可以为相关研究提供参考。展开更多
文摘With the speed gap between storage system access and processor computing, end-to-end data processing has become a bottleneck to improve the total performance of computer systems over the Internet. Based on the analysis of data processing behavior, an adaptive cache organization scheme is proposed with fast address calculation. This scheme can make full use of the characteristics of stack space data access, adopt fast address calculation strategy, and reduce the hit time of stack access. Adaptively, the stack cache can be turned off from beginning to end, when a stack overflow occurs to avoid the effect of stack switching on processor performance. Also, through the instruction cache and the failure behavior for the data cache, a prefetching policy is developed, which is combined with the data capture of the failover queue state. Finally, the proposed method can maintain the order of instruction and data access, which facilitates the extraction of prefetching in the end-to-end data processing.
文摘This article discusses the current status and development strategies of computer science and technology in the context of big data.Firstly,it explains the relationship between big data and computer science and technology,focusing on analyzing the current application status of computer science and technology in big data,including data storage,data processing,and data analysis.Then,it proposes development strategies for big data processing.Computer science and technology play a vital role in big data processing by providing strong technical support.
文摘The device is used for the test on the fuze detonating time according to the initial velocity of the projectile and the altitude and speed of enemy aircraft flight. For the special requirements of the high-speed signal acquisition in the process, the characteristics of the measured signal are analyzed. The system is investigated in chip selection, signal transmission, signal processing, signal storage, post-production PCB design, etc. The appropriate measures and solutions which affect the integrity and accuracy of the signal in each process are proposed. The rules for the layout of the device and wiring are made. The result show that the measurement values are accurate without loss of data.
基金supported by the Scientific and Technological Research and Development Program of China Railway Corporation under Grant N2018G023by the Science and Technology Projects of Sichuan Province under Grants 2018RZ0075
文摘Fault frequency of catenary is related to meteo-rological conditions. In this work, based on the historical data, catenary fault frequency and weather-related fault rate are introduced to analyse the correlation between catenary faults and meteorological conditions, and further the effect of meteorological conditions on catenary oper-ation. Moreover, machine learning is used for catenary fault prediction. As with the single decision tree, only a small number of training samples can be classified cor-rectly by each weak classifier, the AdaBoost algorithm is adopted to adjust the weights of misclassified samples and weak classifiers, and train multiple weak classifiers. Finally, the weak classifiers are combined to construct a strong classifier, with which the final prediction result is obtained. In order to validate the prediction method, an example is provided based on the historical data from a railway bureau of China. The result shows that the mapping relation between meteorological conditions and catenary faults can be established accurately by AdaBoost algorithm. The AdaBoost algorithm can accurately predict a catenary fault if the meteorological conditions are provided.
文摘期刊论文结构化加工在期刊界已经逐步形成共识,国内期刊平台多采用新版期刊文章标签集(Journal Article Tag Suite,JATS)标准进行加工,但JATS标准仅对数据属性提出建议值,自行拓展空间较大,导致实际的数据加工结果千差万别,数据交换困难重重。本文分析了国内外数字化加工和标准进化的历程及我国在XML结构化数据加工中存在的问题,进一步分析了存档及交换标签集、出版标签集等不同子集的特点,提出既能完整保留论文原始信息,又便于提取各类结构化信息的数据加工及存储解决方案,可以根据需要通过减法转换生成符合各平台标准的数据加工存储格式,从而真正实现一次加工、多渠道投放和传播。
文摘在当今信息时代,数据的复杂性不断增加,传统的关系型数据库在大规模数据存储和处理方面面临着挑战。非关系型数据库(Not Only SQL,NoSQL)作为一种新的存储和处理数据的方法,受到了广泛关注,并在分布式存储领域取得了显著的成就。文章重点探讨基于大数据技术的非关系型数据库分布式存储方法,并通过实验进行评估,发现其在可扩展性和安全性方面具有优势,可以为相关研究提供参考。