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Interplay of network dynamics and heterogeneity of ties on spreading dynamics

Physical Review E 2014年第1期90卷 012812-012812页

作者： Luca Ferreri Paolo Bajardi Mario Giacobini Silvia Perazzo Ezio Venturino GECO-Computational Epidemiology Group Department of Veterinary Sciences University of Torino largo Braccini 2 IT-10095 Grugliasco (TO) ARCS - Applied Research on Computational Complex Systems Group Department of Computer Science University of Torino corso Svizzera 185 IT-10149 Torino CSU-Complex Systems Unit Molecular Biotechnology Centre University of Torino via Nizza 52 IT-10126 Torino Department of Mathematics “Giuseppe Peano” University of Torino via Carlo Alberto 10 IT-10123 Torino

The structure of a network dramatically affects the spreading phenomena unfolding upon it. The contact distribution of the nodes has long been recognized as the key ingredient in influencing the outbreak events. However, limited knowledge is currently available on the role of the weight of the edges on the persistence of a pathogen. At the same time, recent works showed a strong influence of temporal network dynamics on disease spreading. In this work we provide an analytical understanding, corroborated by numerical simulations, about the conditions for infected stable state in weighted networks. In particular, we reveal the role of heterogeneity of edge weights and of the dynamic assignment of weights on the ties in the network in driving the spread of the epidemic. In this context we show that when weights are dynamically assigned to ties in the network, a heterogeneous distribution is able to hamper the diffusion of the disease, contrary to what happens when weights are fixed in time.

关键词： computer networks DISTRIBUTION (Probability theory) computer simulation EPIDEMICS UNIDIMENSIONAL unfolding model

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客座编辑序言(英文)

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China Communications 2014年第7期 8-9页

作者：谢高岗 Kave Salamatian 徐明伟谢海永孙毅 Network Technology Research Center at Institute of Computing Technology(ICT) Chinese Academy of Sciences(CAS) University of Savoie the Institute of Computer Networks in Tsinghua University US Innovation Center University of Science and Technology of China the P4P working group of Distributed Computing Industry Association ICT Macquarie University

In recent years,two exciting approaches Software-defined Networking(SDN)and Post-IP architecture(or Future Internet Architecture)to future Internet have been studied all over the world both in industry and *** refactors the relationship between network devices and the software that controls them to separate data plane and control plane and it is regarded as an incremental approach toward the future Internet *** the

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A baseline study of potentially malicious activity across five network telescopes

A baseline study of potentially malicious activity across fi...

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作者： Irwin, Barry Security and Networks Research Group Department of Computer Science Rhodes University Grahamstown South Africa

This paper explores the Internet Background Radiation (IBR) observed across five distinct network telescopes over a 15 month period. These network telescopes consisting of a /24 netblock each and are deployed in IP space administered by TENET, the tertiary education network in South Africa covering three numerically distant /8 network blocks. The differences and similarities in the observed network traffic are explored. Two anecdotal case studies are presented relating to the MS08-067 and MS12-020 vulnerabilities in the Microsoft Windows platforms. The first of these is related to the Conficker worm outbreak in 2008, and traffic targeting 445/tcp remains one of the top constituents of IBR as observed on the telescopes. The case of MS12-020 is of interest, as a long period of scanning activity targeting 3389/tcp, used by the Microsoft RDP service, was observed, with a significant drop on activity relating to the release of the security advisory and patch. Other areas of interest are highlighted, particularly where correlation in scanning activity was observed across the sensors. The paper concludes with some discussion on the application of network telescopes as part of a cyber-defence solution. © 2013 NATO Coop Cyber Def Ctr.

关键词： Scanning

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Real-Time Environmental Monitoring for Cloud-Based Hydrogeological Modeling with HydroGeoSphere

Real-Time Environmental Monitoring for Cloud-Based Hydrogeol...

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IEEE International Conference on High Performance Computing and Communications (HPCC)

作者： Andrei Lapin Eryk Schiller Peter Kropf Oliver Schilling Philip Brunner Almerima Jamakovic Kapic Torsten Braun Sergio Maffioletti Computer Science Department (IIUN) Université de Neuchâtel Neuchâtel Switzerland Centre for Hydrogeology and Geothermics (CHYN) Université de Neuchâtel Neuchâtel Switzerland Universitat Bern Bern BE CH Communication and Distributed Systems Group (CDS) Universität Bern Bern Switzerland Universitat Zurich Zurich ZH CH

This paper describes an architecture for real-time environmental modeling. It consists of a wireless mesh network equipped with sensors and a cloud-based infrastructure to perform real-time environmental simulations using a physics-based model combined with an Ensemble Kalman Filter. The purpose of the system is to optimize groundwater abstraction close to a river. These initial studies demonstrate that the cloud infrastructure can simultaneously compute a large number of simulations, thus allowing for the implementation of Ensemble Kalman Filters in real-time.

关键词： Computational modeling Sensors Real-time systems Data models Predictive models Wireless sensor networks computer architecture

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A search-based approach for architectural design of feedback control concerns in Self-Adaptive systems

A search-based approach for architectural design of feedback...

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2013 IEEE 7th International Conference on Self-Adaptive and Self-Organizing systems, SASO 2013

作者： Andrade, Sandro S. De A. Macedo, Raimundo Jose GSORT Distributed Systems Group Federal Institute of Education Science and Technology of Bahia Salvador-Ba Brazil Department of Computer Science Federal University of Bahia Salvador-Ba Brazil

ISBN: (纸本)9780769551296

A number of approaches for endowing systems with self-Adaptive behavior have been proposed over the past years. Among such efforts, architecture-centric solutions with explicit representation of feedback loops have currently been advocated as a promising research landscape. Although noteworthy results have been achieved on some fronts, the lack of systematic representations of architectural knowledge and effective support for well-informed trade-off decisions still poses significant challenges when designing modern self-Adaptive systems. In this paper, we present a systematic and flexible representation of design dimensions related to feedback control concerns, a set of metrics which estimate quality attributes of resulting automated designs, and a search-based approach to find out a set of Pareto-optimal candidate architectures. The proposed approach has been fully implemented in a supporting tool and a case study with a self-Adaptive cloud computing environment has been undertaken. The results indicate that our approach effectively captures the most prominent degrees of freedom when designing self-Adaptive systems, helps to elicit effective subtle designs, and provides useful support for early analysis of trade-off decisions. © 2013 IEEE.

关键词： Economic and social effects

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Supporting environmental modelling with Taverna workflows, web services and desktop grid technology 7

Supporting environmental modelling with Taverna workflows, w...

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7th International Congress on Environmental Modelling and Software, iEMSs 2014

作者： Horváth, Ferenc Ittzés, Péter Ittzés, Dóra Barcza, Zoltán Dobor, Laura Hidy, Dóra Marosi, Attila Hardisty, Alex Institute of Ecology and Botany Centre for Ecological Research Hungarian Academy of Sciences Alkotmány u. 2-4. Vácrátót2163 Hungary Department of Meteorology Eötvös Loránd University Pázmány sétány 1/A Budapest1117 Hungary Institute of Botany and Ecophysiology Szent Istvan University Páter K. u.1. Gödöllo2100 Hungary Laboratory of Parallel and Distributed Systems Institute for Computer Science and Control Hungarian Academy of Sciences P.O. Box 63 Budapest1518 Hungary School of Computer Science and Informatics Cardiff University Queen's Buildings 5 The Parade Roath CardiffCF24 3AA United Kingdom

Ecosystem functioning, climate change, and multiple interactions among biogeochemical cycles, climate system, site conditions and land use options are leading-edge topics in recent environmental modelling. Terrestrial ecosystem models are widely used to support carbon sequestration and ecosystem studies under various ecological circumstances. Our team uses the Biome-BGC model (Numerical Terradynamic Simulation group, University of Montana), and develops an improved model version of it, called Biome-BGC MuSo. Both the original and the improved model estimate the ecosystem scale storage and fluxes of energy, carbon, nitrogen and water, controlled by various physical and biological processes on a daily time-scale. Web services were also developed and integrated with parallel processing desktop grid technology. Taverna workflow management system was used to build up and carry out elaborated workflows like seamless data flow to model simulation, Monte Carlo experiment, model sensitivity analysis, model-data fusion, estimation of ecosystem service indicators or extensive spatial modelling. Straightforward management of complex data analysis tasks, organized into appropriately documented, shared and reusable scientific workflows enables researchers to carry out detailed and scientifically challenging 'in silico' experiments and applications that could open new directions in ecosystem research and in a broader sense it supports progress in environmental modelling. The workflow approach built upon these web services allows even the most complicated computations to be initiated without the need of programming skills and deep understanding of model structure and initialization. The developments enable a wider array of scientists to perform ecosystem scale simulations, and to perform analyses not previously possible due to high complexity and computational demand.

关键词： Web services

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Dynamic joint resource optimization for LTE-Advanced relay networks

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IEEE Transactions on Wireless Communications 2013年第11期12卷 5668-5678页

作者： Ju, Honghao Liang, Ben Li, Jiandong Yang, Xiaoniu Information Science Institute State Key Laboratory of Integrated Service Networks Xidian University Xi'an Shaanxi China Department of Electrical and Computer Engineering University of Toronto ON Canada No. 36 Research Institute of China Electronics Technology Group Corporation Jiaxing Zhejiang China

A dynamic optimization algorithm is proposed for the joint allocation of subframes, resource blocks, and power in the Type 1 inband relaying scheme mandatory in the LTE-Advanced standard. Following the general framework of Lyapunov optimization, we decompose the original problem into three sub-problems in the forms of convex programming, linear programming, and mixed-integer *** solve the last sub-problem in the Lagrange dual domain, showing that it has zero duality gap, and that a primal optimum can be obtained with probability one. The proposed algorithm dynamically adapts to traffic and channel fluctuations, it accommodates both instantaneous and average power constraints, and it obtains arbitrarily near-optimal sum utility of each user's average throughput. Simulation results demonstrate that the joint optimum can significantly outperform suboptimal alternatives. © 2013 IEEE.

关键词： Linear programming

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Nonlinear analysis of dynamical complex networks 2014

Abstract and Applied Analysis

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Abstract and Applied Analysis 2014年第SI42期2014卷 1-4页

作者： Wang, Zidong Shen, Bo Dong, Hongli Hu, Jun He, Xiao Ding, Derui Department of Computer Science Brunel University Uxbridge Middlesex UB8 3PH United Kingdom Communication Systems and Networks (CSN) Research Group Faculty of Engineering King Abdulaziz University Jeddah 21589 Saudi Arabia School of Information Science and Technology Donghua University Shanghai 200051 China College of Electrical and Information Engineering Northeast Petroleum University Daqing 163318 China Research Institute of Intelligent Control and Systems Harbin Institute of Technology Harbin 150001 China Department of Applied Mathematics Harbin University of Science and Technology Harbin 150080 China Department of Automation Tsinghua University Beijing 100084 China Department of Applied Mathematics Anhui Polytechnic University Wuhu 241000 China

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Generalized GPU-based artificial neural network surrogate model for extended period hydraulic simulation

Generalized GPU-based artificial neural network surrogate mo...

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World Environmental and Water Resources Congress 2013: Showcasing the Future

作者： Behandish, M. Wu, Z.Y. Department of Computer Science and Engineering University of Connecticut Storrs 06269 CT United States Applied Research Group Bentley Systems Incorporated Watertown CT 06795 United States

ISBN: (纸本)9780784412947

This paper presents a generalized methodology and implementation aimed at surrogating the extended period hydraulic simulation with Artificial Neural networks (ANNs) for a large water distribution system. Each snapshot of the hydraulic simulation is modeled as a set of input-output relationships, replicated by a collection of ANNs trained on the commodity graphics processing unit (GPU). Previous research by the authors on a particular demand-monitoring zone (DMZ) system with the limited hydraulic properties is generalized to include a comprehensive account of state variables, and their dependencies are captured by a systematic sensitivity analysis that guides the modular assembly of multi-ANN meta model. The trained networks are validated for successive calls over extended periods of time (as long as a week), and tremendous improvements in terms of accuracy and reliability are obtained and compared with the results in previous publications. The improved meta model manifests as a powerful tool for fast and accurate hydraulic response prediction for operation optimization. © 2013 American Society of Civil Engineers.

关键词： Neural networks

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A high-level architecture for efficient packet trace analysis on GPU co-processors

A high-level architecture for efficient packet trace analysi...

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Information Security for South Africa (ISSA)

作者： Alastair Nottingham Barry Irwin Security and Networks Research Group Department of Computer Science Rhodes University Grahamstown South Africa

This paper proposes a high-level architecture to support efficient, massively parallel packet classification, filtering and analysis using commodity Graphics Processing Unit (GPU) hardware. The proposed architecture aims to provide a flexible and efficient parallel packet processing and analysis framework, supporting complex programmable filtering, data mining operations, statistical analysis functions and traffic visualisation, with minimal CPU overhead. In particular, this framework aims to provide a robust set of high-speed analysis functionality, in order to dramatically reduce the time required to process and analyse extremely large network traces. This architecture derives from initial research, which has shown GPU co-processors to be effective in accelerating packet classification to up to tera-bit speeds with minimal CPU overhead, far exceeding the bandwidth capacity between standard long term storage and the GPU device. This paper provides a high-level overview of the proposed architecture and its primary components, motivated by the results of prior research in the field.

关键词： Protocols Graphics processing units Arrays Prototypes Indexes Acceleration

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