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Filling the gap between Software Defined Networking and Wireless Mesh Networks

Filling the gap between Software Defined Networking and Wire...

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International Conference on Network and Service Management

作者： Vagner Nascimento Marcelo Moraes Rosivaldo Gomes Billy Pinheiro Antônio Abelém Vinicius C. M. Borges Kleber V. Cardoso Eduardo Cerqueira Program Postgraduate in Electrical Engineering (PPGEE) Federal University of Pará (UFPA) Belém PA Brasil program Postgraduate in Science Computer (PPGCC) Federal University of Pará (UFPA) Belém PA Brasil Faculdade de Computção (FACOMP) Federal University of Pará (UFPA) Belém PA Brasil Institute of Informatics (INF) Federal University of Goiás (UFG) Goiânia GO Brasil

Software Defined Networking (SDN) has emerged as a new paradigm that highly increase the network management flexibility through simple but powerful abstractions. The key idea is decoupling the control plane, which makes the forward decisions, from the data plane, which effectively makes the forward. However, the OpenFlow, the main SDN enabler, is designed mainly by wired networks characteristics. As consequence, Wireless Mesh Networks (WMNs) is not suitable for operating as control plane and many wireless networks features are neglected in the OpenFlow, e.g.: power control and network ID. In addition, there are few effort research to extend SDN to wireless networks and these existing works focus on very specific issues of this integration. In this paper, we propose an architecture to extent the OpenFlow functionalities in order to proper deal with wireless networks, including an approach for transporting the control plane over wireless multihop networks. The extensions include new rules, actions, and commands, which bring the network management flexibility to the wireless context. We validated our proposal by implementing and testing some extensions in a small real world testbed. As a proof of concept, we illustrate the OpenFlow capability of isolation between research and production traffics in a wireless backhaul.

关键词： Ad hoc networks Wireless networks IEEE 802.11 Standards Protocols Software Production

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Suppress of substrate-assisted depletion effects in super junction LDMOS on thin film SOI

Suppress of substrate-assisted depletion effects in super ju...

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2nd International Conference on Materials Science and Manufacturing, ICMSM 2013

作者： Xia, Chao Cheng, Xin Hong Wang, Zhong Jian He, Dawei Cao, Duo Jia, Ting Ting Yu, Yue Hui Shen, Da Shen National State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Micro-system and Information Technology Chinese Academy of Sciences China Electrical Department of Electrical and Computer Engineering University of Alabama in Huntsville Huntsville AL 35899 United States

ISBN: (纸本)9783037857328

Conventional super-junction lateral double diffused MOSFET (SJ-LDMOS) fabricated on Silicon on Insulator (SOI) substrate suffers from low breakdown voltage under the same on-resistance due to substrate-assisted depletion effect. To suppress this effect, it is important to find the charge density in the inversion layer under buried oxide. In this paper, we propose a charge density equation and its formulation. The results were used in a 3D device simulator to optimize the device structure. The experimental results confirm that the equation is useful to optimize device performance. The breakdown voltage of structure increased 54% and on-state-resistance decreased 58% compared to conventional SJ device. The device fabrication procedure is fully compatible with mainstream SOI CMOS process. © (2013) Trans Tech Publications, Switzerland.

关键词： Substrates

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Incremental algorithms for closeness centrality

Incremental algorithms for closeness centrality

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IEEE International Conference on Big Data

作者： Ahmet Erdem Sariyüce Kamer Kaya Erik Saule Ümit V. Çatalyiirek Computer Science and Engineering The Ohio State University Biomedical Informatics The Ohio State University Electrical and Computer Engineering The Ohio State University

Centrality metrics have shown to be highly correlated with the importance and loads of the nodes within the network traffic. In this work, we provide fast incremental algorithms for closeness centrality computation. Our algorithms efficiently compute the closeness centrality values upon changes in network topology, i.e., edge insertions and deletions. We show that the proposed techniques are efficient on many real-life networks, especially on small-world networks, which have a small diameter and spike-shaped shortest distance distribution. We experimentally validate the efficiency of our algorithms on large-scale networks and show that they can update the closeness centrality values of 1.2 million authors in the temporal DBLP-coauthorship network 460 times faster than it would take to recompute them from scratch.

关键词： Measurement Social network services Runtime Network topology Filtering Power system dynamics Algorithm design and analysis

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A mobile application flow representation for mutual understanding of IT and healthcare professionals

A mobile application flow representation for mutual understa...

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15th International Conference on Human-computer Interaction, HCI International 2013

作者： Erturan, Yusuf Nasuh Bilgen, Semih Tokdemir, Gul Cagiltay, Nergiz E. Yildiz, Ekrem Özcebe, Esra Department of Medical Informatics METU Ankara Turkey Electrical Engineering Department METU Ankara Turkey Department of Computer Engineering Cankaya University Ankara Turkey Department of Software Engineering Atilim University Ankara Turkey Department of Information Sciences METU Ankara Turkey Faculty of Education International Cyprus University Lefkosa Cyprus

ISBN: (纸本)9783642392313

Ever since mobile applications were developed and became popular, they have started to take part in almost every field of our lives. Healthcare is one of the most popular fields that mobile applications have become a part of. However, development of mobile healthcare applications requires an inter-disciplinary work on which people from different domains should communicate. To do so efficiently, mobile application instructions should be provided as clearly as possible so that mutual understanding can be achieved. This study, aims to provide a methodology to provide the common grounds for healthcare and IT specialists so that to improve the satisfaction level of all the stakeholders of the system from the provided IT services and the end-user interfaces. In other words, by providing a better communication medium for the stakeholders during the design phase, we believe that software development process will be improved, so do their satisfaction from the developed system. © 2013 Springer-Verlag.

关键词： Software design

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A converged optical wireless architecture for mobile backhaul networks

A converged optical wireless architecture for mobile backhau...

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International Conference on Optical Network Design and Modeling, ONDM

作者： Kostas Ramantas Kyriakos Vlachos Georgios Ellinas Antonis Hadjiantonis Computer Engineering and Informatics Department & Computer Technology Inst University of Patras Greece Department of Electrical and Computer Engineering University of Cyprus Cyprus Department of Engineering University of Nicosia Cyprus

In this work we propose a new unified PON-RAN architecture for LTE mobile backhaul networks, employing ring-based WDM PONs. The proposed architecture supports dynamic setup of virtual circuits for inter-base station communication, over a dedicated λ LAN channel. The reservation mechanism is arbitrated by the OLT, which also monitors the traffic imbalances of downstream channels. The proposed architecture also supports load balancing, by dynamically reallocating and sharing the capacity of the downstream wavelengths.

关键词： Optical network units Local area networks computer architecture Bandwidth Delays Passive optical networks Wavelength division multiplexing

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QoE Estimation Models for Tele-immersive Applications

QoE Estimation Models for Tele-immersive Applications

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IEEE EUROCON

作者： Narasimha Raghavan Veeraragavan Hein Meling Roman Vitenberg Department of Informatics University of Oslo Department of Electrical Engineering and Computer Science University of Stavanger

ISBN: (纸本)9781467322331

Tele-immersive applications, which are regarded as the next generation distributed multimedia applications, are highly interactive and aims to offer an immersive experience to its users. A challenge with such applications is to provide the best possible quality of experience (QoE) under changing conditions. In particular, it would be highly desirable to be able to predict the QoE perceived by users in response to adaptation, prior to actual deployment. However, there are no QoE prediction models for tele-immersive applications. Instead QoE is evaluated after deployment using either objective or subjective assessment techniques. Unfortunately, objective assessment lacks the accuracy of human perception. At the same time, subjective assessment requires human-provided ratings of the applications, which is time consuming and thus not cost-effective. In this paper, we propose QoE prediction models that will accurately predict the user-perceived QoE of a tele-immersive conferencing application. The proposed models are cost-effective and lend themselves to fast evaluation cycles, because the models does not involve human-provided ratings. We validate our models using results from subjective assessment experiments. The models can be used for real-time monitoring of user-perceived QoE, in addition to designing QoE-driven adaptation for tele-immersive applications.

关键词： Delays Synchronization Estimation Computational modeling Mathematical model Semiconductor device modeling Training

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On numerical modeling performance of generalized preconditioned methods 13

On numerical modeling performance of generalized preconditio...

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6th Balkan Conference in informatics, BCI 2013

作者： Gravvanis, G.A. Filelis-Papadopoulos, C.K. Lipitakis, E.A. Department of Electrical and Computer Engineering Democritus University of Thrace Kimmeria GR 67100 Xanthi Greece Department of Informatics Athens University of Economics and Business 76 Patission Street GR 104 34 Athens Greece

ISBN: (纸本)9781450318518

During the last decades, research efforts have been focused on the derivation of effective preconditioned iterative methods. The preconditioned iterative methods are mainly categorized into implicit preconditioned methods and explicit preconditioned methods. In this manuscript we review implicit preconditioned methods, based on incomplete and approximate factorization, and explicit preconditioned methods, based on sparse approximate inverses and explicit approximate inverses. Modified Moore-Penrose conditions are presented and theoretical estimates for the sensitivity of the explicit approximate inverse matrix of the explicit preconditioned method are derived. Finally, the performance of the preconditioned iterative methods is illustrated by solving characteristic 2D elliptic problem and numerical results are given indicating a qualitative agreement with the theoretical estimates. Copyright 2013 ACM.

关键词： Numerical models

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Parallel implementation of the Ant Colony System algorithm for automated combinational logic circuits design using CUDA architecture

Parallel implementation of the Ant Colony System algorithm f...

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Proceedings of the International Convention MIPRO

作者： Džanan Bajgorić Adnan Porović Tarik Handanović Novica Nosović Faculty of Electrical Engineering Department for Computer Science and Informatics University of Sarajevo Bosnia and Herzegovina

This paper propose parallel implementation of Ant Colony System (ACS) algorithm for automated combinational circuit design. Ant Colony System is one of the most popular and widely used Ant Colony Optimization (ACO) algorithm and heuristic algorithm in general. As digital logic circuits become more complex, efficient circuit design is priority and use of heuristic methods are unavoidable. Unfortunately, the optimization problems became so complex in sense of their size, even the most powerful heuristic algorithms can't solve them on single CPU. In order to be able to tackle the problem, parallel version of ACS is needed and this paper presents CUDA (Compute Unified Device Architecture) C language implementation.

关键词： Logic gates Algorithm design and analysis Graphics processing units computer architecture Digital circuits Heuristic algorithms Combinational circuits

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Cost and Utilization Optimization of Amazon EC2 instances

Cost and Utilization Optimization of Amazon EC2 instances

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IEEE International Conference on Cloud Computing

作者： P. Kokkinos T. A. Varvarigou A. Kretsis P. Soumplis E. A. Varvarigos Department of Electrical and Computer Engineering National Technical University of Athens Athens Greece Department of Computer Engineering and Informatics University of Patras Patras Greece

The monitoring and the analysis of public clouds gains momentum, due to their widespread exploitation by individual users, researchers and companies for their daily tasks. We propose an algorithm for optimizing the cost and the utilization of a set of running Amazon EC2 instances by resizing them appropriately. The algorithm, namely Cost and Utilization Optimization (CUO) algorithm, receives information regarding the current set of instances used (their number, type, utilization) and proposes a new set of instances for serving the same load, so as to minimize cost and maximize utilization, or increase performance efficiency. CUO is integrated in Smart cloud Monitoring (SuMo), an open-source tool we develop for collecting monitoring data from Amazon Web Services (AWS) and analyzing them. A number of experiments are performed, using input data that correspond to realist AWS configuration scenarios, which exhibit the benefits of the CUO algorithm.

关键词： Public clouds Monitoring Amazon web services Cost Utilization Optimization

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Advances in Computational Science, engineering and Information Technology: Proceedings of the Third International Conference on Computational Science, engineering and Information Technology (CCSEIT-2013), KTO Karatay University, June 7-9, 2013, Konya,Turkey - Volume 1

Advances in Computational Science, Engineering and Informati...

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3rd International Conference on Computational Science, engineering and Information Technology, CCSEIT 2013

作者： Nagamalai, Dhinaharan Kumar, Ashok Annamalai, Annamalai Dept. of Computer Engineering KTO Karatay University 130 Karatay Konya 42020 Turkey School of Computing and Informatics University of Louisiana at Lafayette 214 Oliver Hall Lafayette 70504-4330 LA United States Dept. of Electrical and Computer Engineering Prairie View A and M University Prairie View 77446-0519 TX United States

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