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Spatial cloud computing: how can the geospatial sciences use and help shape cloud computing? 被引量:56
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作者 Chaowei Yang Michael Goodchild +5 位作者 Qunying Huang Doug Nebert Robert Raskin Yan Xu Myra Bambacus Daniel Fay 《International Journal of Digital Earth》 SCIE 2011年第4期305-329,共25页
The geospatial sciences face grand information technology(IT)challenges in the twenty-first century:data intensity,computing intensity,concurrent access intensity and spatiotemporal intensity.These challenges require ... The geospatial sciences face grand information technology(IT)challenges in the twenty-first century:data intensity,computing intensity,concurrent access intensity and spatiotemporal intensity.These challenges require the readiness of a computing infrastructure that can:(1)better support discovery,access and utilization of data and data processing so as to relieve scientists and engineers of IT tasks and focus on scientific discoveries;(2)provide real-time IT resources to enable real-time applications,such as emergency response;(3)deal with access spikes;and(4)provide more reliable and scalable service for massive numbers of concurrent users to advance public knowledge.The emergence of cloud computing provides a potential solution with an elastic,on-demand computing platform to integrateobservation systems,parameter extracting algorithms,phenomena simulations,analytical visualization and decision support,and to provide social impact and user feedbackthe essential elements of the geospatial sciences.We discuss the utilization of cloud computing to support the intensities of geospatial sciences by reporting from our investigations on how cloud computing could enable the geospatial sciences and how spatiotemporal principles,the kernel of the geospatial sciences,could be utilized to ensure the benefits of cloud computing.Four research examples are presented to analyze how to:(1)search,access and utilize geospatial data;(2)configure computing infrastructure to enable the computability of intensive simulation models;(3)disseminate and utilize research results for massive numbers of concurrent users;and(4)adopt spatiotemporal principles to support spatiotemporal intensive applications.The paper concludes with a discussion of opportunities and challenges for spatial cloud computing(SCC). 展开更多
关键词 digital earth cyber GIS GEODYNAMICS SPACE-time high-performance computing geospatial cyberinfrastructure
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基于数据手套的逼真虚拟手的实现 被引量:9
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作者 任程 戴树岭 《系统仿真学报》 CAS CSCD 北大核心 2008年第22期6214-6217,共4页
在基于头盔、数据手套的虚拟现实系统中虚拟手的实现效果十分重要,传统的虚拟手模型将手掌和各手指分割为多个刚体,当虚拟手运动时在刚体连接处产生重叠或裂缝,严重影响了沉浸感。在此根据虚拟手的运动特点对其进行整体建模,并快捷地对... 在基于头盔、数据手套的虚拟现实系统中虚拟手的实现效果十分重要,传统的虚拟手模型将手掌和各手指分割为多个刚体,当虚拟手运动时在刚体连接处产生重叠或裂缝,严重影响了沉浸感。在此根据虚拟手的运动特点对其进行整体建模,并快捷地对数据手套采集的原始关节数据进行校正,在可编程图形硬件上利用顶点混合算法将校正后的数据作用于虚拟手模型来产生皮肤变形,在满足实时性的同时提供了逼真的视觉效果。最后还通过搭建实验系统验证了所述方法的可行性。 展开更多
关键词 虚拟现实 数据手套 顶点混合 实时性
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Event-triggered finite-time command-filtered tracking control for nonlinear time-delay cyber physical systems against cyber attacks
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作者 Yajing MA Yuan WANG +1 位作者 Zhanjie LI Xiangpeng XIE 《Frontiers of Information Technology & Electronic Engineering》 SCIE EI CSCD 2024年第2期225-236,共12页
This article addresses the secure finite-time tracking problem via event-triggered command-filtered control for nonlinear time-delay cyber physical systems(CPSs)subject to cyber attacks.Under the attack circumstance,t... This article addresses the secure finite-time tracking problem via event-triggered command-filtered control for nonlinear time-delay cyber physical systems(CPSs)subject to cyber attacks.Under the attack circumstance,the output and state information of CPSs is unavailable for the feedback design,and the classical coordinate conversion of the iterative process is incompetent in relation to the tracking task.To solve this,a new coordinate conversion is proposed by considering the attack gains and the reference signal simultaneously.By employing the transformed variables,a modified fractional-order command-filtered signal is incorporated to overcome the complexity explosion issue,and the Nussbaum function is used to tackle the varying attack gains.By systematically constructing the Lyapunov-Krasovskii functional,an adaptive event-triggered mechanism is presented in detail,with which the communication resources are greatly saved,and the finite-time tracking of CPSs under cyber attacks is guaranteed.Finally,an example demonstrates the effectiveness. 展开更多
关键词 cyber physical systems Finite-time tracking Event-triggered Command-filtered control ATTACKS
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Finite-time fault-tolerant control of teleoperating cyber physical system against faults 被引量:1
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作者 PAN Chengwei LIU Xia +1 位作者 CHEN Yong LI Meng 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2023年第2期469-478,共10页
This paper studies a finite-time adaptive fractionalorder fault-tolerant control(FTC)scheme for the slave position tracking of the teleoperating cyber physical system(TCPS)with external disturbances and actuator fault... This paper studies a finite-time adaptive fractionalorder fault-tolerant control(FTC)scheme for the slave position tracking of the teleoperating cyber physical system(TCPS)with external disturbances and actuator faults.Based on the fractional Lyapunov stability theory and the finite-time stability theory,a fractional-order nonsingular fast terminal sliding mode(FONFTSM)control law is proposed to promote the tracking and fault tolerance performance of the considered system.Meanwhile,the adaptive fractional-order update laws are designed to cope with the unknown upper bounds of the unknown actuator faults and external disturbances.Furthermore,the finite-time stability of the closed-loop system is proved.Finally,comparison simulation results are also provided to show the validity and the advantages of the proposed techniques. 展开更多
关键词 teleoperating cyber physical system(TCPS) fractional Lyapunov stability fault-tolerant control(FTC) finite-time stability
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Distributed dynamic event-based finite-time dissipative synchronization control for semi-Markov switched fuzzy cyber-physical systems against random packet losses
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作者 伍锡如 张煜翀 +1 位作者 张畑畑 张斌磊 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第10期328-342,共15页
This paper is concerned with the finite-time dissipative synchronization control problem of semi-Markov switched cyber-physical systems in the presence of packet losses, which is constructed by the Takagi–Sugeno fuzz... This paper is concerned with the finite-time dissipative synchronization control problem of semi-Markov switched cyber-physical systems in the presence of packet losses, which is constructed by the Takagi–Sugeno fuzzy model. To save the network communication burden, a distributed dynamic event-triggered mechanism is developed to restrain the information update. Besides, random packet dropouts following the Bernoulli distribution are assumed to occur in sensor to controller channels, where the triggered control input is analyzed via an equivalent method containing a new stochastic variable. By establishing the mode-dependent Lyapunov–Krasovskii functional with augmented terms, the finite-time boundness of the error system limited to strict dissipativity is studied. As a result of the help of an extended reciprocally convex matrix inequality technique, less conservative criteria in terms of linear matrix inequalities are deduced to calculate the desired control gains. Finally, two examples in regard to practical systems are provided to display the effectiveness of the proposed theory. 展开更多
关键词 cyber-physical systems finite-time synchronization distributed dynamic event-triggered mechanism random packet losses
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论网络时代报业的生存与发展 被引量:3
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作者 陈昌勇 《皖西学院学报》 2009年第6期101-103,共3页
借助媒介分析理论,对网络时代报业的生存与发展进行了分析。网络媒体得天独厚的传播优势给传统报业的生存与发展带来了巨大挑战——读者数量递减、广告市场分流、专业人才流失等。以此为基础,进一步阐述了网络时代报业的生存和发展之路... 借助媒介分析理论,对网络时代报业的生存与发展进行了分析。网络媒体得天独厚的传播优势给传统报业的生存与发展带来了巨大挑战——读者数量递减、广告市场分流、专业人才流失等。以此为基础,进一步阐述了网络时代报业的生存和发展之路:发挥传统优势,办有内涵的纸质报纸;顺应时代要求,大力发展数字报业。 展开更多
关键词 网络时代 传统报业 数字报业
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Renewable and Nonrenewable Energy Flow Resiliency for Day-to-Day Production and Consumption 被引量:2
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作者 Bahman Zohuri Farhang Mossavar-Rahmani Masoud Moghaddam 《Journal of Energy and Power Engineering》 2022年第1期13-18,共6页
Energy resilience is about ensuring a business and end-use consumers have a reliable,regular supply of energy and contingency measures in place in the event of a power failure,generating a source of power such as elec... Energy resilience is about ensuring a business and end-use consumers have a reliable,regular supply of energy and contingency measures in place in the event of a power failure,generating a source of power such as electricity for daily needs from an uninterrupted source of energy no matter either renewable or nonrenewable.Causes of resilience issues include power surges,weather,natural disasters,or man-made accidents,and even equipment failure.The human operational error can also be an issue for grid-power supply to go down and should be factored into resilience planning.As the energy landscape undergoes a radical transformation,from a world of large,centralized coal plants to a decentralized energy world made up of small-scale gas-fired production and renewables,the stability of electricity supply will begin to affect energy pricing.Businesses must plan for this change.The challenges that the growth of renewables brings to the grid in terms of intermittency mean that transmission and distribution costs consume an increasing proportion of bills.With progress in the technology of AI(Artificial Intelligence)integration of such progressive technology in recent decades,we are improving our resiliency of energy flow,so we prevent any unexpected interruption of this flow.Ensuring your business is energy resilient helps insulate against price increases or fluctuations in supply,becoming critical to maintaining operations and reducing commercial risk.In the form short TM(Technical Memorandum),this paper covers this issue. 展开更多
关键词 Resilience system energy flow energy storage energy grid BI(business intelligence) AI cyber security decision making in real-time machine learning and deep learning BD(big data)and cloud-based servers for repository and storage of data
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Collaborative prediction for bus arrival time based on CPS 被引量:2
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作者 蔡雪松 《Journal of Central South University》 SCIE EI CAS 2014年第3期1242-1248,共7页
To improve the accuracy of real-time public transport information release system, a collaborative prediction model was proposed based on cyber-physical systems architecture. In the model, the total bus travel time was... To improve the accuracy of real-time public transport information release system, a collaborative prediction model was proposed based on cyber-physical systems architecture. In the model, the total bus travel time was divided into three parts: running time, dwell time and intersection delay time, and the data were divided into three categories of historical data, static data and real-time data. The bus arrival time was obtained by fusion computing the real-time data in perception layer together with historical data and static data in collaborative layer. The validity of the collaborative model was verified by the data of a typical urban bus line in Shanghai, and 1538 sets of data were collected and analyzed from three different perspectives. By comparing the experimental results with the actual results, it is shown that the experimental results are with higher prediction accuracy, and the collaborative prediction model adopted is able to meet the demand for bus arrival prediction. 展开更多
关键词 prediction model cyber-physical system architecture bus arrival time collaborative prediction
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网络攻击下的Markov跳变系统有限时间控制 被引量:2
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作者 谭天 高金凤 +1 位作者 王锦霞 汪家琪 《信息安全研究》 2021年第2期145-154,共10页
网络攻击多样化、分布式和高频率的特点,对国民经济和社会发展带来巨大威胁.在工业控制领域,针对网络控制系统安全的研究愈发重要.主要考虑了一类基于混杂驱动机制与双通道量化的Markov跳变系统,研究了系统在网络攻击下的有限时间稳定... 网络攻击多样化、分布式和高频率的特点,对国民经济和社会发展带来巨大威胁.在工业控制领域,针对网络控制系统安全的研究愈发重要.主要考虑了一类基于混杂驱动机制与双通道量化的Markov跳变系统,研究了系统在网络攻击下的有限时间稳定和H_∞性能.首先,建立输出反馈的Markov跳变系统模型,设计了输出反馈控制器.为减少控制系统中公共网络带宽负担,降低无效信号的传输率,在传统事件触发机制基础上,引入混杂驱动机制和双通道对数量化器,平衡系统性能和通信数据传输率.然后,引入网络攻击模型,增强Markov跳变系统对外部攻击的抵抗性.构造Lyapunov-Krasovskii泛函,利用线性矩阵不等式给出系统在有限时间的稳定性判据和H_∞性能指标,最后通过2个仿真实例证明所提出的定理的有效性. 展开更多
关键词 混杂驱动机制 量化 MARKOV跳变系统 网络攻击 有限时间
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基于防御技术计算机网络安全研究 被引量:1
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作者 许彩芳 查道贵 杨秋菊 《中国多媒体与网络教学学报(电子版)》 2020年第11期194-195,226,共3页
伴随计算机网络技术突飞猛进的同时,如何加强网络安全、增强安全保障技术便成了当务之急。论文阐述了计算机网络运行系统,分析了网络技术发展阶段的四个模式;剖析了当前网络中的运行环境弊端、系统漏洞、隐患及风险;提出了网络安全运行... 伴随计算机网络技术突飞猛进的同时,如何加强网络安全、增强安全保障技术便成了当务之急。论文阐述了计算机网络运行系统,分析了网络技术发展阶段的四个模式;剖析了当前网络中的运行环境弊端、系统漏洞、隐患及风险;提出了网络安全运行的五种策略;极大地提高了网络安全。 展开更多
关键词 网络时代 计算机防御技术 网络安全研究
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Fully Distributed Economic Dispatch for Cyber-physical Power System with Time Delays and Channel Noises
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作者 Yuhang Zhang Ming Ni Yonghui Sun 《Journal of Modern Power Systems and Clean Energy》 SCIE EI CSCD 2022年第6期1472-1481,共10页
Economic dispatch problem(EDP)is a fundamental optimization problem in power system operation,which aims at minimizing the total generation cost.In fact,the power grid is becoming a cyber-physical power system(CPPS).T... Economic dispatch problem(EDP)is a fundamental optimization problem in power system operation,which aims at minimizing the total generation cost.In fact,the power grid is becoming a cyber-physical power system(CPPS).Therefore,the quality of communication is a key point.In this paper,considering two important factors,i.e.,time delays and channel noises,a fully distributed consensus based algorithm is proposed for solving EDP.The critical maximum allowable upper bounds of heterogeneous communication delays and self-delays are obtained.It should be pointed out that the proposed algorithm can be robust against the time-varying delays and channel noises considering generator constraints.In addition,even with time-varying delays and channel noises,the power balance of supply and demand is not broken during the optimization.Several simulation studies are presented to validate the correctness and superiority of the developed results. 展开更多
关键词 Distributed economic dispatch consensus-based algorithm cyber-physical power system time delay channel noises
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网络时代高校期刊面临的问题及应对 被引量:1
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作者 彭建军 《中南民族大学学报(人文社会科学版)》 CSSCI 北大核心 2007年第5期177-180,共4页
网络时代,传统的期刊编辑、出版和发行的理论和实践面临着新的变革和发展机遇。本文探讨了新技术如何影响期刊的编辑出版和发行,如何理解刊网关系,网络出版形式是否会改变传统学术期刊的地位,网络出版与传统期刊出版相比,由于其既有的局... 网络时代,传统的期刊编辑、出版和发行的理论和实践面临着新的变革和发展机遇。本文探讨了新技术如何影响期刊的编辑出版和发行,如何理解刊网关系,网络出版形式是否会改变传统学术期刊的地位,网络出版与传统期刊出版相比,由于其既有的局限,其延伸出的问题表现在哪些方面,如何认识和有效解决。 展开更多
关键词 网络时代 高校期刊 刊网关系
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Adaptive output regulation for cyber-physical systems under time-delay attacks
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作者 Dan Jin Bo Chen +1 位作者 Li Yu Shichao Liu 《Control Theory and Technology》 EI CSCD 2022年第1期20-31,共12页
In this paper,we present an output regulation method for unknown cyber-physical systems(CPSs)under time-delay attacks in both the sensor-to-controller(S-C)channel and the controller-to-actuator(C-A)channel.The propose... In this paper,we present an output regulation method for unknown cyber-physical systems(CPSs)under time-delay attacks in both the sensor-to-controller(S-C)channel and the controller-to-actuator(C-A)channel.The proposed approach is designed using control inputs and tracking errors which are accessible data.Reinforcement learning is leveraged to update the control gains in real time using policy or value iterations.A thorough stability analysis is conducted and it is found that the proposed controller can sustain the convergence and asymptotic stability even when two channels are attacked.Finally,comparison results with a simulated CPS verify the effectiveness of the proposed output regulation method. 展开更多
关键词 Adaptive output regulation cyber-physical systems time-delay attacks Reinforcement learning
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网络系统实时性模型的验证方法综述
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作者 杜泽民 王晓玲 陈宜成 《网络空间安全》 2018年第3期59-64,共6页
互联网技术的发展和应用在各个生产领域中发挥着越来越积极的作用,但随着网络技术应用的深入,网络系统的实时性成为影响网络安全的一大因素,因此对网络模型的通信实时性、威胁分析实时性的验证成为网络安全的重要保障。目前,国内外在实... 互联网技术的发展和应用在各个生产领域中发挥着越来越积极的作用,但随着网络技术应用的深入,网络系统的实时性成为影响网络安全的一大因素,因此对网络模型的通信实时性、威胁分析实时性的验证成为网络安全的重要保障。目前,国内外在实时性验证方面有诸多研究,形成了不同的方法体系。文章把主要的模型实时性验证方法,从理论和工具角度加以介绍分析,并对各个方法进行了比较。 展开更多
关键词 网络安全 实时性 模型验证 实时性验证
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Analysis Markov Delay Control Strategy for Smart Home Systems
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作者 Zhejun Kuang Liang Hu Feiyan Chen 《International Journal of Technology Management》 2013年第1期34-36,共3页
with the development of science and technology, smart home systems require better, faster to meet the needs of human. In order to achieve this goal, the human-machine-items all need to interact each other with underst... with the development of science and technology, smart home systems require better, faster to meet the needs of human. In order to achieve this goal, the human-machine-items all need to interact each other with understand, efficient and speedy. Cps could unify combination with the human-machine-items; realize the interaction between the physical nformation and the cyber world. However, information interaction and the control task needs to be completed in a valid time. Therefore, the transform delay control strategy becomes more and more important. This paper analysis Markov delay control strategy for smart home systems, which might help the system decrease the transmission delay. 展开更多
关键词 cyber physical systems smart home real-time control architecture
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Precision time protocol attack strategies and their resistance to existing security extensions
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作者 Waleed Alghamdi Michael Schukat 《Cybersecurity》 EI CSCD 2021年第1期160-176,共17页
The IEEE 1588 precision time protocol(PTP)is very important for many industrial sectors and applications that require time synchronization accuracy between computers down to microsecond and even nanosecond levels.Neve... The IEEE 1588 precision time protocol(PTP)is very important for many industrial sectors and applications that require time synchronization accuracy between computers down to microsecond and even nanosecond levels.Nevertheless,PTP and its underlying network infrastructure are vulnerable to cyber-attacks,which can stealthily reduce the time synchronization accuracy to unacceptable and even damage-causing levels for individual clocks or an entire network,leading to financial loss or even physical destruction.Existing security protocol extensions only partially address this problem.This paper provides a comprehensive analysis of strategies for advanced persistent threats to PTP infrastructure,possible attacker locations,and the impact on clock and network synchronization in the presence of security protocol extensions,infrastructure redundancy,and protocol redundancy.It distinguishes between attack strategies and attacker types as described in RFC7384,but further distinguishes between the spoofing and time source attack,the simple internal attack,and the advanced internal attack.Some experiments were conducted to demonstrate the impact of PTP attacks.Our analysis shows that a sophisticated attacker has a range of methodologies to compromise a PTP network.Moreover,all PTP infrastructure components can host an attacker,making the comprehensive protection of a PTP network against a malware infiltration,as for example exercised by Stuxnet,a very tedious task. 展开更多
关键词 APT cyber-attacks IEEE 1588 PTP Security time synchronization protocols
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基于时间压缩的流量加速回放方法
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作者 王硕 柏军 +2 位作者 王佰玲 张旭 刘红日 《网络与信息安全学报》 2021年第5期178-188,共11页
随着网络流量的激增,在虚拟环境下对流量进行回放面临着许多问题。为了满足回放过程中流量完整性和准确性的需求,提出了一种基于时间压缩的流量加速回放方法,实现了在虚拟环境下对真实网络流量的加速回放。该方法优先将时间间隔集合中... 随着网络流量的激增,在虚拟环境下对流量进行回放面临着许多问题。为了满足回放过程中流量完整性和准确性的需求,提出了一种基于时间压缩的流量加速回放方法,实现了在虚拟环境下对真实网络流量的加速回放。该方法优先将时间间隔集合中最大的时间间隔进行压缩,对间隔较小的时间减少压缩,从而减少时间压缩造成的单位时间流量猛增现象,进而降低流量的丢包率。从丢包率、时间间隔误差、相似度3方面对其效果进行衡量。实验表明,与等比压缩方法相比,该方法在相似度上表现较差,但有着较低的丢包率和时间间隔误差。 展开更多
关键词 网络安全 流量回放 最大优先 时间间隔
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网络时代“90后”大学生思想政治工作面临的机遇与挑战及对策分析
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作者 周理平 《西安职业技术学院学报》 2012年第4期38-41,49,共5页
互联网在较短时间内已经并将继续迅猛而深刻地改变着我们的世界,并孕育、产生、发展出了一个崭新的时代一网络时代.作为出生于这一时代并伴随着这一时代发展而成长起来的“90后”大学生,无疑是受网络影响最为深刻的一代,他们的身上... 互联网在较短时间内已经并将继续迅猛而深刻地改变着我们的世界,并孕育、产生、发展出了一个崭新的时代一网络时代.作为出生于这一时代并伴随着这一时代发展而成长起来的“90后”大学生,无疑是受网络影响最为深刻的一代,他们的身上也由此被深深地打上了网络时代的烙印.处在这样一个时代背景下,正确认识和剖析网络对“90后”大学生思想政治工作的影响,并制定出合理的对策,也就成为一项摆在所有高校思想政治工作者面前的具有重大意义而又紧迫的时代课题. 展开更多
关键词 网络时代 “90后”大学生 思想政治工作
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电力信息物理融合系统环境中的网络攻击研究综述 被引量:215
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作者 汤奕 陈倩 +3 位作者 李梦雅 王琦 倪明 梁云 《电力系统自动化》 EI CSCD 北大核心 2016年第17期59-69,共11页
电力信息物理融合系统(CPS)借助大量传感设备与复杂通信网络使现代电力系统形成一个实时感知、动态控制与信息服务的多维异构复杂系统。信息流交互使得电网面临更多潜在威胁。近年来频发的网络攻击影响电网稳定运行事件敲响了电力系统... 电力信息物理融合系统(CPS)借助大量传感设备与复杂通信网络使现代电力系统形成一个实时感知、动态控制与信息服务的多维异构复杂系统。信息流交互使得电网面临更多潜在威胁。近年来频发的网络攻击影响电网稳定运行事件敲响了电力系统安全的警钟。目前,国内对电力CPS网络攻击方面的研究尚处于起步阶段。文中首先提出了电力CPS领域中网络攻击的定义,从通信网络覆盖范围和网络攻击目的对攻击行为进行分类;其次,从发、输、配、用电侧4个环节归纳和分析了电力CPS网络攻击典型场景;最后,对国内电力CPS网络攻击研究现状进行了总结与展望。 展开更多
关键词 信息物理系统 网络攻击 信息安全 智能电网 实时感知 电力通信
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信息物理融合系统研究综述 被引量:160
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作者 王中杰 谢璐璐 《自动化学报》 EI CSCD 北大核心 2011年第10期1157-1166,共10页
信息物理融合系统(Cyber-physical systems,CPS)是多维异构的计算单元和物理对象在网络环境中高度集成交互的新型智能复杂系统,具有实时、鲁棒、自治、高效和高性能等特点.本文首先介绍了CPS的概念和特征,综述了CPS的当前发展状况与应... 信息物理融合系统(Cyber-physical systems,CPS)是多维异构的计算单元和物理对象在网络环境中高度集成交互的新型智能复杂系统,具有实时、鲁棒、自治、高效和高性能等特点.本文首先介绍了CPS的概念和特征,综述了CPS的当前发展状况与应用前景;其次,对CPS的系统构成进行了简要分析,讨论了CPS与相关技术的区别与联系;最后,对CPS技术发展所面临的主要挑战及可能的研究方向进行了总结与展望. 展开更多
关键词 信息物理融合系统 实时 高性能 嵌入式系统 网络控制
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