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arXiv 2017年

作者： Abad, Mehdi Salehi Heydar Ercetin, Ozgur ElBatt, Tamer Nafie, Mohammed Faculty of Engineering and Natural Sciences Sabanci University Istanbul Turkey Computer Science and Engineering Dept. American University in Cairo AUC Avenue New Cairo11835 Egypt Electronics and Communications Engineering Dept. Faculty of Engineering Cairo University Giza12613 Egypt Department of Electronics and Communications Cairo University Wireless Intelligent Networks Center Nile University

We consider a class of wireless powered devices employing Hybrid Automatic Repeat reQuest (HARQ) to ensure reliable end-to-end communications over a two-state time-varying channel. A receiver, with no power source, relies on the energy transferred by a Simultaneous Wireless Information and Power Transfer (SWIPT) enabled transmitter to receive and decode information. Under the two-state channel model, information is received at two different rates while it is only possible to harvest energy in one of the states. The receiver aims to decode its messages with minimum expected number of re-transmissions. Dynamic and continuous nature of the problem motivated us to use a novel Markovian framework to bypass the complexities plaguing the conventional approaches such as MDP. Using the theory of absorbing Markov chains, we show that there exists an optimal policy utilizing the incoming RF signal solely to harvest energy or to accumulate mutual information. Hence, we convert the original problem with continuous action and state space into an equivalent one with discrete state and action space. For independent and identically distributed channels, we prove the optimality of a simple-to-implement harvest-first-store-later type policy. However, for time-correlated channels, we demonstrate that statistical knowledge of the channel may significantly improve the performance over such policies. Copyright © 2017, The Authors. All rights reserved.

关键词： Error correction

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Dimensioning virtualized wireless access networks from a common pool of resources 13

Dimensioning virtualized wireless access networks from a com...

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13th IEEE Annual Consumer communications and Networking Conference, CCNC 2016

作者： Abdel-Rahman, Mohammad J. Cardoso, Kleber V. MacKenzie, Allen B. DaSilva, Luiz A. Dept. of Electrical and Computer Engineering Wireless Virginia Tech United States Instituto de Informática Universidade Federal de Goiás Goiânia GO Brazil CONNECT Centre for Future Networks and Communications Trinity College Dublin Ireland

ISBN: (纸本)9781467392921

Resource sharing in mobile wireless networks has been employed to reduce costs, extend coverage, and ease the entry of new players in the market. The introduction of programmability and virtualization is expected to amplify these benefits of resource sharing. In this paper, we study a new virtualization-based paradigm for resource sharing in mobile wireless networks. Specifically, we consider the problem of resource allocation, particularly when user demands are uncertain. We formulate several two-stage sequential stochastic allocation schemes that provide tradeoffs between cost and user satisfaction. These allocation schemes are studied under different resource provider pricing models. Our simulations demonstrate that: First, while reducing cost significantly, virtualization considerably improves user satisfaction, and virtualization gains increase with the number of operators that share resources. Second, the improvements in cost, user satisfaction, and resource usage increase substantially with the level of user clustering. © 2016 IEEE.

关键词： Virtualization

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Active self-paced learning for cost-effective and progressive face identification

arXiv

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arXiv 2017年

作者： Lin, Liang Wang, Keze Meng, Deyu Zuo, Wangmeng Zhang, Lei School of Data and Computer Science Sun Yat-sen University Guangzhou China Engineering Research Center Advanced Computing Engineering Software of Ministry of Education China School of Mathematics and Statistics Ministry of Education Key Lab of Intelligent Networks and Network Security Xi'an Jiaotong University China School of Computer Science and Technology Harbin Institute of Technology Harbin China Dept. of Computing Hong Kong Polytechnic University Hong Kong

This paper aims to develop a novel cost-effective framework for face identification, which progressively maintains a batch of classifiers with the increasing face images of different individuals. By naturally combining two recently rising techniques: active learning (AL) and self-paced learning (SPL), our framework is capable of automatically annotating new instances and incorporating them into training under weak expert recertification. We first initialize the classifier using a few annotated samples for each individual, and extract image features using the convolutional neural nets. Then, a number of candidates are selected from the unannotated samples for classifier updating, in which we apply the current classifiers ranking the samples by the prediction confidence. In particular, our approach utilizes the high-confidence and low-confidence samples in the self-paced and the active user-query way, respectively. The neural nets are later fine-tuned based on the updated classifiers. Such heuristic implementation is formulated as solving a concise active SPL optimization problem, which also advances the SPL development by supplementing a rational dynamic curriculum constraint. The new model finely accords with the "instructor-student-collaborative" learning mode in human education. The advantages of this proposed framework are two-folds: i) The required number of annotated samples is significantly decreased while the comparable performance is guaranteed. A dramatic reduction of user effort is also achieved over other state-of-the-art active learning techniques. ii) The mixture of SPL and AL effectively improves not only the classifier accuracy compared to existing AL/SPL methods but also the robustness against noisy data. We evaluate our framework on two challenging datasets, which include hundreds of persons under diverse conditions, and demonstrate very promising results. Please find the code of this project at: http://***/projects/aspl/ Copyright © 201

关键词： Cost effectiveness

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DFTBC: data fusion and tree-based clustering routing protocol for energy-efficient in wireless sensor networks 6

DFTBC: Data fusion and tree-based clustering routing protoco...

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6th International Conference on Knowledge and Systems Engineering, KSE 2014

作者： Tan, Nguyen Duy Viet, Nguyen Dinh Dept. of Networks and Computer Communications University of Engineering and Technology VNU-HN Hanoi Viet Nam

ISBN: (纸本)9783319116792

Energy efficiency is a unique challenge for designing routing protocols in wireless sensor network (WSN) to extend the lifetime of the entire network because sensor nodes are power constrained devices. To solve this problem, in this paper, we propose a data fusion and tree-based clustering routing algorithm (DFTBC). DFTBC designing consists of two main works. In the first work, tree-based clustering routing technique is used to connect the nodes in a cluster to form a minimum spanning tree, where each node communicates only with its nearest neighbor using distance and remaining energy of nodes to decide which node will be the cluster head (CH). In the second work, we fuse one or more packets to generate a packet with a smaller size based on the Dempster-Shafer and Slepian-Wolf theory. Our simulation results show that the network lifetime with using of our proposed protocol can be improved about 350% and 35% compared to low-energy adaptive clustering hierarchy (LEACH) and power-efficient gathering in sensor information system (PEGASIS), respectively. © Springer International Publishing Switzerland 2015.

关键词： Routing protocols

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SSTBC: Sleep scheduled and tree-based clustering routing protocol for energy-efficient in wireless sensor networks

SSTBC: Sleep scheduled and tree-based clustering routing pro...

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2015 International Conference on Computing and Communication Technologies: Research, Innovation, and Vision for Future, IEEE RIVF 2015

作者： Tan, Nguyen Duy Viet, Nguyen Dinh Faculty of Information Technology Hung Yen University of Technology Education Viet Nam Dept. of Networks and Computer Communications University of Engineering and Technology VNU-HN Hanoi Viet Nam

ISBN: (纸本)9781479980437

Since sensor nodes are battery power constrained devices in wireless sensor network (WSN), so how to use the energy of sensor nodes efficiently to prolong the network lifetime is a chief challenge for designing routing protocols. To solve this problem, in this paper, we propose sleep scheduled and tree-based clustering approach routing algorithm (SSTBC) for energy-efficient in WSN. SSTBC preserves energy by turning off radio (entering sleep mode) of either impossible or unnecessary nodes, which observe almost the same information, base on their location information to remove redundant data. In addition, to further reduce energy dissipation of communication in network, we build minimum spanning tree with the root as the cluster head (CH) from active nodes in a cluster to forward data packets to base station (BS). Our simulation results show that the network lifetime with using of our proposed protocol can be improved about 250% and 23% compared to low-energy adaptive clustering hierarchy (LEACH) and power-efficient gathering in sensor information system (PEGASIS), respectively. © 2015 IEEE.

关键词： Routing protocols

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SCBC: Sector-chain based clustering routing protocol for energy efficiency in heterogeneous wireless sensor network 8

SCBC: Sector-chain based clustering routing protocol for ene...

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8th International Conference on Advanced Technologies for communications, ATC 2015

作者： Tan, Nguyen Duy Dinh Viet, Nguyen Faculty of Information Technology Hung Yen University of Technology Education Hungyen Viet Nam Dept. of Networks and Computer Communications University of Engineering and Technology VNU-HN Hanoi Viet Nam

ISBN: (纸本)9781467383745

One of the most important challenges in heterogeneous wireless sensor network (WSN) is to design a routing protocol that use energy efficiently to prolong the lifetime of the entire network due to the limited battery power of sensor nodes. To solve this problem, in this paper, we propose Sector-Chain Based Clustering (SCBC) Routing Protocol, in which, entire network area is divided into sectors (clusters), which balance to the number of nodes. SCBC further reduces energy dissipation of communication in network by constructing chain for each cluster with the chain leader as the cluster head (CH) or secondary cluster head (SCH) that has high residual energy and the shortest distance between candidate nodes and base station (BS) in network. In addition, SCBC improves energy efficiency by calculating the time length of each round in the steady data transmission phase for CHs or SCHs but still guarantee that it is alive in next round. Our simulation results show that the network lifetime of our proposed protocol can be improved about 70% and 20% in comparison with PEGASIS (Power-Efficient Gathering in Sensor Information System) and IEEPB (An Improved Energy-Efficient PEGASIS-Based) protocols, respectively. © 2015 IEEE.

关键词： Energy efficiency

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Direct evidence for shock-powered optical emission in a nova

arXiv

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arXiv 2020年

作者： Aydi, Elias Sokolovsky, Kirill V. Chomiuk, Laura Steinberg, Elad Li, Kwan Lok Vurm, Indrek Metzger, Brian D. Strader, Jay Mukai, Koji Pejcha, Ondřej Shen, Ken J. Wade, Gregg A. Kuschnig, Rainer Moffat, Anthony F.J. Pablo, Herbert Pigulski, Andrzej Popowicz, Adam Weiss, Werner Zwintz, Konstanze Izzo, Luca Pollard, Karen R. Handler, Gerald Ryder, Stuart D. Filipović, Miroslav D. Alsaberi, Rami Z.E. Manojlović, Perica de Oliveira, Raimundo Lopes Walter, Frederick M. Vallely, Patrick J. Buckley, David A.H. Brown, Michael J.I. Harvey, Eamonn J. Kawash, Adam Kniazev, Alexei Kochanek, Christopher S. Linford, Justin Mikolajewska, Joanna Molaro, Paolo Orio, Marina Page, Kim L. Shappee, Benjamin J. Sokoloski, Jennifer L. Center for Data Intensive and Time Domain Astronomy Department of Physics and Astronomy Michigan State University East LansingMI48824 United States Sternberg Astronomical Institute Moscow State University Universitetskii pr. 13 Moscow119992 Russia Astro Space Center of Lebedev Physical Institute Profsoyuznaya St. 84/32 Moscow117997 Russia Columbia Astrophysics Laboratory Department of Physics Columbia University New YorkNY10027 United States Racah Institute of Physics Hebrew University Jerusalem91904 Israel Department of Physics UNIST Ulsan44919 Korea Republic of Institute of Astronomy National Tsing Hua University Hsinchu30013 Taiwan Tartu Observatory University of Tartu Tõravere Tartumaa61602 Estonia CRESST X-ray Astrophysics Laboratory NASA GSFC GreenbeltMD20771 United States Department of Physics University of Maryland Baltimore County 1000 Hilltop Circle BaltimoreMD21250 United States Institute of Theoretical Physics Faculty of Mathematics and Physics Charles University Prague Czech Republic Department of Astronomy Theoretical Astrophysics Center University of California BerkeleyCA94720 United States Department of Physics and Space Science Royal Military College of Canada PO Box 17000 Station Forces KingstonONK7K 7B4 Canada Institute of Communication Networks and Satellite Communications Graz University of Technology Infeldgasse 12 Graz8010 Austria Dépt. de Physique Univ. De Montréal C.P. 6128 Succ. Centre-Ville Centre de Recherche en Astrophysique du Quéebec MontréealQCH3C 3J7 Canada AAVSO 49 Bay State Rd CambridgeMA02138 United States Instytut Astronomiczny Uniwersytet Wroclawski Kopernika 11 Wroclaw51-622 Poland Silesian University of Technology Institute of Electronics Akademicka 16 Gliwice44-100 Poland Institute for Astrophysics University of Vienna Tuerkenschanzstrasse 17 ViennaA-1180 Austria Universität Innsbruck Institut für Astro- und Teilchenphysik Technikerstrasse 25 InnsbruckA-6020 Austria D

Classical novae are thermonuclear explosions that occur on the surfaces of white dwarf stars in interacting binary systems1. It has long been thought that the luminosity of classical novae is powered by continued nuclear burning on the surface of the white dwarf after the initial runaway2. However, recent observations of GeV γrays from classical novae have hinted that shocks internal to the nova ejecta may dominate the nova emission. Shocks have also been suggested to power the luminosity of events as diverse as stellar mergers3, supernovae4, and tidal disruption events5, but observational confirmation has been lacking. Here we report simultaneous space-based optical and γ-ray observations of the 2018 nova V906 Carinae (ASASSN-18fv), revealing a remarkable series of distinct correlated flares in both bands. The optical and γ-ray flares occur simultaneously, implying a common origin in shocks. During the flares, the nova luminosity doubles, implying that the bulk of the luminosity is shock-powered. Furthermore, we detect concurrent but weak X-ray emission from deeply embedded shocks, confirming that the shock power does not appear in the X-ray band and supporting its emergence at longer wavelengths. Our data, spanning the spectrum from radio to γ-ray, provide direct evidence that shocks can power substantial luminosity in classical novae and other optical transients. Copyright © 2020, The Authors. All rights reserved.

关键词： Luminance

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RECODIS: Resilient Communication Services Protecting End-User Applications from Disaster-Based Failures

RECODIS: Resilient Communication Services Protecting End-Use...

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International Conference on Transparent Optical networks

作者： Jacek Rak David Hutchison Eusebi Calle Teresa Gomes Matthias Gunkel Paul Smith Janos Tapolcai Sofie Verbrugge Lena Wosinska Gdansk University of Technology Faculty of Electronics Telecommunications and Informatics PL Lancaster University School of Computing and Communications UK University of Girona ES Department of Electrical and Computer Engineering University of Coimbra / INESC Coimbra PT Deutsche Telekom Technik Fixed Mobile Engineering Deutschland Optical Packet Transport Darmstadt DE AIT Austrian Institute of Technology GmbH AT Budapest University of Technology and Economics Dept. of Telecommunication and Media Informatics HU Ghent University - iMinds Internet-based Communications Networks and Services research group (IBCN) BE KTH Royal Institute of Technology School of Information and Communication Technology SE

ISBN: (纸本)9781509014682

Disaster-based failures can seriously disrupt any communication network, making its services unavailable. Such disruptions may be caused by natural disasters, technology-related failures, or malicious attacks, and they are observably increasing in number, intensity and scale. When network services that are a part of critical infrastructure become unavailable, commercial and/or societal problems are inevitable. The issue of limiting the impact of disaster-based failures needs to be urgently addressed due to the lack of suitable mechanisms deployed in the current networks. The COST CA15127 (RECODIS) Action will fill this gap by developing appropriate solutions to provide cost-efficient resilient communications in the presence of disaster-based disruptions considering both existing and emerging communication network architectures. It will be driven by researchers from academia and industry in strong cooperation with governmental bodies. In this paper, we highlight the objectives of RECODIS, its structure, as well as planned outcomes.

关键词： end-to-end resilience disaster-based disruptions

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Interference Resolution Method for IEEE802.15.4-Based Wireless Sensor networks

Interference Resolution Method for IEEE802.15.4-Based Wirele...

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IEEE Conference on Vehicular Technology (VTC)

作者： Ji-Hoon Park Chan-Min Park Seungjin Lee Byung-Seo Kim ITO Business Division Nongshim Data System Seoul Korea Dept. of Computer and Information Communications Engineering Hongik University Sejongsi Korea

ISBN: (纸本)9781479944811

Because IEEE802.15.4-based wireless sensor networks (WSNs) and IEEE802.11-based wireless local area networks (WLANs) use same ISM frequency bands, they interferes each other. Based on the past researches, the interference makes severe impacts on the performances of WSNs rather than that of WLANs. This paper proposes a method to improve IEEE802.15.4-based WSNs performances coexisting with WLANs by transmitting only beacon frames in interference-free-channels. The method increases the reliability of beacon frames as well as overall channel utilizations. The effectiveness of the proposed method is evaluated through the extensive simulations.

关键词： Wireless sensor networks Personal area networks Interference IEEE 802.15 Standards Protocols Performance evaluation

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DWT-Based Multi-Adaptive Image coding for Frame Memory Reduction in LCD Overdrive

DWT-Based Multi-Adaptive Image coding for Frame Memory Reduc...

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2013 IEEE RIVF International Conference on Computing and Communication Technologies: Research, Innovation, and Vision for Future, RIVF 2013

作者： Huu, Tai Nguyen Thi, Hoang-Lan Nguyen Dinh, Chon-Tam Le Dept. of Information Technology Hue Univ. and Hanoi Univ. of Science and Technology Hue Viet Nam Dept. of Data Communications and Computer Networks Hanoi Univ. of Science and Technology Hanoi Viet Nam Department of Electrical and Computer Engineering Sherbrooke University Sherbrooke Canada

ISBN: (纸本)9781479913503

In this paper, DWT-Based Multi-Adaptive Image Coding (DBMAIC) is proposed to increase compression performance for Frame Memory Reduction in LCD Overdrive. The DBMAIC development is based on DWT-Based Adaptive Mode Selection (DAMS)[9] integrated with Adaptive-Threshold Technique (ATT). ATT is proposed to reduce blocking effect and increase adaptability of DAMS. Experimental results show that the performance of the proposed method is much better than DAMS and that of conventional schemes. © 2013 IEEE.

关键词： Discrete wavelet transforms

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