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Proceedings of the 2017 International Conference on Embedded Wireless Systems and networks

作者： Felix Sutton Reto Da Forno David Gschwend Tonio Gsell Roman Lim Jan Beutel Lothar Thiele Computer Engineering and Networks Laboratory ETH Zurich Switzerland

ISBN: (纸本)9780994988614

We present the design, implementation and experimental evaluation of an efficient event-triggered wireless sensing system. We propose an event-triggered logical component model, which encapsulates adaptability, responsiveness and energy efficiency design constraints. We then design a wireless sensing system for monitoring acoustic emissions through the composition of event-triggered logical components. We present the integration of these components onto a novel dual-processor wireless sensing platform, and extensively evaluate the developed prototype with respect to responsiveness and energy efficiency using real-world acoustic emission traces.

关键词： Event-triggered wireless sensing wireless sensor networks acoustic emission sensing cyber-physical systems

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Simulator for Hybrid CDN-P2P Video-on-Demand Systems 9

Simulator for Hybrid CDN-P2P Video-on-Demand Systems

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2017 9th IEEE International Conference on Communication Software and networks (ICCSN 2017)

作者： Ge Zhang Wei Liu Yuze Zou Wenqing Cheng School of Computer and Information Engineering International Joint Research Laboratory for Cooperative Vehicular Networks of Henan Henan University School of Electronic Information and Communications Huazhong Univ.of Science and Technology

ISBN: (纸本)9781509038237;9781509038220

The hybrid architecture of content distribution network(CDN) and peer to peer(P2 P) is promising in providing online streaming media services. It's convenient and low in cost to study the design space of hybrid streaming systems via simulation. In this paper, we designed a discreteevent simulator for hybrid CDN-P2 P Vo D systems. The simulator supports multiple switching strategies, different video coding methods and P2 P piece selection algorithms. We verified the simulator and conducted experiments to study the design space of hybrid streaming systems. Our results show that adjusting CDN connection threshold is a more efficient way to provide a smooth streaming than adjusting CDN streaming rate. The simulator will be a reference tool for researchers to take a further look at the hybrid Vo D systems.

关键词： component simulator Vo D hybrid switching

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Self-Evolutionary Neuron Model for Fast-Response Spiking Neural networks

TechRxiv

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TechRxiv 2019年

作者： Zhang, Anguo Han, Ying Hu, Jing Niu, Yuzhen Gao, Yueming Chen, Zhizhang Zhao, Kai College of Physics and Information Engineering Fuzhou University Fujian350108 China The Key Laboratory of Medical Instrumentation Pharmaceutical Technology of Fujian Province Fuzhou350116 China Research Institute of Ruijie Ruijie Networks Co. Ltd Fujian350002 China School of Public Health Xiamen University Xiamen361102 China College of Information and Intelligent Transportation Fujian Chuanzheng Communications College Fuzhou350007 China Fujian Key Laboratory of Network Computing and Intelligent Information Processing College of Mathematics and Computer Science Fuzhou University The Key Laboratory of Spatial Data Mining and Information Sharing Ministry of Education Fujian350108 China College of Physics and information Engineering Fuzhou University the Key Laboratory of Medical Instrumentation Pharmaceutical Technology of Fujian Province Fujian350108 China College of Physics and Information Engineering Fuzhou University 350108 China Faculty of Science and Technology University of Macau 999078 China

We propose two simple and effective spiking neuron models to improve the response time of the conventional spiking neural network. The proposed neuron models adaptively tune the presynaptic input current depending on the input received from its presynapses and subsequent neuron firing events. We analyze and derive the firing activity homeostatic convergence of the proposed models. We experimentally verify and compare the models on MNIST handwritten digits and FashionMNIST classification tasks. We show that the proposed neuron models significantly increase the response speed to the input signal. Experiment codes are available at https://***/anvien/Evol-SNN. © 2019, CC0.

关键词： Neural networks

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Efficient convolutional neural network for audio event detection

arXiv

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arXiv 2017年

作者： Meyer, Matthias Cavigelli, Lukas Thiele, Lothar Computer Engineering and Networks Laboratory ETH Zurich Switzerland

Wireless distributed systems as used in sensor networks, Internet-of-Things and cyber-physical systems, impose high requirements on resource efficiency. Advanced preprocessing and classification of data at the network edge can help to decrease the communication demand and to reduce the amount of data to be processed centrally. In the area of distributed acoustic sensing, the combination of algorithms with a high classification rate and resource-constraint embedded systems is essential. Unfortunately, algorithms for acoustic event detection have a high memory and computational demand and are not suited for execution at the network edge. This paper addresses these aspects by applying structural optimizations to a convolutional neural network for audio event detection to reduce the memory requirement by a factor of more than 500 and the computational effort by a factor of 2.1 while performing 9.2% better. Copyright © 2017, The Authors. All rights reserved.

关键词： Embedded systems

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Testbed Assisted Control Flow Tracing for Wireless Embedded Systems 17

Testbed Assisted Control Flow Tracing for Wireless Embedded ...

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Proceedings of the 2017 International Conference on Embedded Wireless Systems and networks

作者： Roman Lim Lothar Thiele Computer Engineering and Networks Laboratory ETH Zurich Switzerland

ISBN: (纸本)9780994988614

Observing wireless embedded systems is difficult because of resource constraints and tight interaction with the environment. In this paper, we develop a method that can reconstruct the entire control flow of a program based on recorded state changes (time and state) of I/O pins. We instrument program binaries by statically inserting instructions that alter the states of a set of I/O pins. During program execution, the overhead of added instructions must be kept as low as possible to preserve the original program behavior. We first adapt an existing software-only placement method to generate an unambiguous pattern on the I/O pins for every possible execution path. Then, we make use of recorded timestamps to further reduce the runtime overhead substantially. This timing information is extracted from the executable by means of an elaborate static analysis. An algorithm is presented that safely reduces the number of recorded events while still being able to uniquely determine the executed program path. Experiments on a testbed show that using time information reduces the runtime overhead by up to 38.3 % for typical applications. The average runtime overhead is 19%.

关键词： embedded systems time analysis Control flow tracing instrumentation

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A Delay and Traffic Balancing Sensitive Scheme for User Association in Limited Fronthaul H-CRAN s

A Delay and Traffic Balancing Sensitive Scheme for User Asso...

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International Symposium on Wireless Communication Systems (ISWCS)

作者： Shaobo Liu Biling Zhang Jung-Lang Yu Zhu Han The State Key Laboratory of Integrated Services Networks Xidian University P. R. China Department of Electrical Engineering Fu Jen Catholic University Taiwan Department of Computer Science and Engineering Kyung Hee University Seoul South Korea

In order to fully exploit the potentials of the heterogeneous cloud radio access networks (H-CRANs), how to associate the user equipments (UEs) with the appropriate low power nodes (LPNs) is a very essential problem. However, when the fronthaul constraint is limited, the UEs are sensitive to delay, and the LPNs are concerned about the traffic balancing, such a problem has not gained enough attention. In this paper, the aforementioned user association problem is investigated and formulated as a bidirectional matching game, where the UEs are seeking to access the most preferred LPN while the LPNs are seeking to accept the most preferred UEs. To find the solution to the proposed game, an iteration algorithm is proposed, and its computational complexity and convergence are proved as well. Simulation results show that our proposed user association scheme is effective and outperforms the existing schemes-in terms of achieved data rates, delay, traffic balancing and overall utility.

关键词： Games Delays Interference Downlink Wireless communication Radio access networks Upper bound

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Competition: Robust Flooding using Back-to-Back Synchronous Transmissions with Channel-Hopping 17

Competition: Robust Flooding using Back-to-Back Synchronous ...

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Proceedings of the 2017 International Conference on Embedded Wireless Systems and networks

作者： Roman Lim Reto Da Forno Felix Sutton Lothar Thiele Computer Engineering and Networks Laboratory ETH Zurich Switzerland

ISBN: (纸本)9780994988614

We present a new protocol that is based on consecutive, synchronous transmissions. By aligning transmissions based on timeouts, the protocol becomes more resilient to interference. We propose two methods to mitigate the effect of less accurate temporal packet alignment, namely time synchronization and random transmit powers.

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Omnidirectional Quasi-Orthogonal Space-Time Block Coded Massive MIMO Systems

arXiv

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arXiv 2018年

作者： Liu, Can Xia, Xiang-Gen Li, Yongzhao Gao, Xiqi Zhang, Hailin State Key Laboratory of Integrated Services Networks Xidian University Xian710071 China Department of Electrical and Computer Engineering University of Delaware NewarkDE19716 United States National Mobile Communications Research Laboratory Southeast University Nanjing210096 China

Common signals in public channels of cellular systems are usually transmitted omnidirectionally from the base station (BS). In recent years, both discrete and consecutive omnidirectional space-time block codings (STBC) have been proposed for massive multiple-input multiple-output (MIMO) systems with a uniform linear array (ULA) configuration to ensure cell-wide coverage. In these systems, constant received signal power at discrete angles, or constant received signal sum power in a few consecutive time slots at any angle is achieved. In addition, equal-power transmission per antenna and full spatial diversity can be achieved as well. In this letter, by utilizing the property of orthogonal complementary codes (OCCs), a new consecutive omnidirectional quasi-orthogonal STBC (QOSTBC) design is proposed, in which constant received sum power at any angle can be realized with equal-power transmission per antenna through one STBC transmission, and a higher diversity order of 4 can be achieved. In addition, the proposed design can be further extended to the uniform planar array (UPA) configuration with the two-dimensional OCCs. Copyright © 2018, The Authors. All rights reserved.

关键词： Space-time block coding (STBC)

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Computation rate maximization in UAV-enabled wireless powered mobile-edge computing systems

arXiv

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arXiv 2018年

作者： Zhou, Fuhui Wu, Yongpeng Hu, Rose Qingyang Qian, Yi Department of Electrical and Computer Engineering Utah State University United States School of Information Engineering Nanchang University 330031 China State Key Laboratory of Integrated Services Networks Xidian University Xian710071 China Shanghai Key Laboratory of Navigation and Location Based Services Shanghai Jiao Tong University Minhang200240 China Department of Electrical and Computer Engineering Utah State University United States Department of Electrical and Computer Engineering University of Nebraska-Lincoln OmahaNE68182 United States

Mobile edge computing (MEC) and wireless power transfer (WPT) are two promising techniques to enhance the computation capability and to prolong the operational time of low-power wireless devices that are ubiquitous in Internet of Things. However, the computation performance and the harvested energy are significantly impacted by the severe propagation loss. In order to address this issue, an unmanned aerial vehicle (UAV)-enabled MEC wireless powered system is studied in this paper. The computation rate maximization problems in a UAV-enabled MEC wireless powered system are investigated under both partial and binary computation offloading modes, subject to the energy harvesting causal constraint and the UAV's speed constraint. These problems are non-convex and challenging to solve. A two-stage algorithm and a three-stage alternative algorithm are respectively proposed for solving the formulated problems. The closed-form expressions for the optimal central processing unit frequencies, user offloading time, and user transmit power are derived. The optimal selection scheme on whether users choose to locally compute or offload computation tasks is proposed for the binary computation offloading mode. Simulation results show that our proposed resource allocation schemes outperforms other benchmark schemes. The results also demonstrate that the proposed schemes converge fast and have low computational complexity. Copyright © 2018, The Authors. All rights reserved.

关键词： Unmanned aerial vehicles (UAV)

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Charting brain growth in tandem with brain templates at school age

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Science Bulletin 2020年第22期65卷 1924-1934,M0004页

作者： Hao-Ming Dong F.Xavier Castellanos Ning Yang Zhe Zhang Quan Zhou Ye He Lei Zhang Ting Xu Avram J.Holmes B.T.Thomas Yeo Feiyan Chen Bin Wang Christian Beckmann Tonya White Olaf Sporns Jiang Qiu Tingyong Feng Antao Chen Xun Liu Xu Chen Xuchu Weng Michael P.Milham Xi-Nian Zuo Research Center for Lifespan Development of Brain and Mind Institute of PsychologyChinese Academy of Sciences(CAS)Beijing 100101China State Key Laboratory of Cognitive Neuroscience and Learning Beijing Normal UniversityBeijing 100875China Department of Child and Adolescent Psychiatry New York University School of MedicineNew YorkNY 10016USA Nathan Kline Institute for Psychiatric Research OrangeburgNew YorkNY 10962USA Department of Psychology University of CASBeijing 100049China Department of Psychological and Brain Sciences Indiana UniversityBloomingtonIN 47405USA Child Mind Institute New YorkNY 10022USA Department of Psychology Yale UniversityNew HavenCT 06511USA Department of Electrical and Computer Engineering Clinical Imaging Research CentreN.1 Institute for Health and Memory Networks ProgramNational University of SingaporeSingapore 117574Singapore Department of Physics Zhejiang UniversityHangzhou 310058China Binzhou Medical University Yantai 264100China Donders Institute Radboud University Medical CentreNijmegen 6525 ENNetherlands Department of Child and Adolescent Psychiatry Erasmus UniversityRotterdam 3000 CBNetherlands Department of Radiology Erasmus University Medical CentreRotterdam 3000 CANetherlands School of Psychology Southwest UniversityChongqing 400715China Institute for Brain Research and Rehabilitation South China Normal UniversityGuangzhou 510631China Institute of Children Health Changzhou Children’s HospitalChangzhou 213003China Key Laboratory of Brain and Education School of Education ScienceNanning Normal UniversityNanning 530001China CAS Key Laboratory of Behavioral Science Institute of PsychologyBeijing 100101China IDG/McGovern Institute for Brain Research Beijing Normal UniversityBeijing 100875China

Brain growth charts and age-normed brain templates are essential resources for researchers to eventually contribute to the care of individuals with atypical developmental *** present work generates age-normed brain templates for children and adolescents at one-year intervals and the corresponding growth charts to investigate the influences of age and ethnicity using a common pediatric neuroimaging *** accelerated longitudinal cohorts with the identical experimental design were implemented in the United States and *** magnetic resonance imaging(MRI)of typically developing school-age children(TDC)was obtained up to three times at nominal intervals of1.25 *** protocol generated and compared population-and age-specific brain templates and growth charts,respectively.A total of 674 Chinese pediatric MRI scans were obtained from 457 Chinese TDC and 190 American pediatric MRI scans were obtained from 133 American ***-and age-specific brain templates were used to quantify warp cost,the differences between individual brains and brain *** growth charts for labeled brain network areas were *** analyses of cost functions supported the necessity of age-specific and ethnicitymatched brain templates,which was confirmed by growth chart *** analyses revealed volumetric growth differences between the two ethnicities primarily in lateral frontal and parietal areas,regions which are most variable across individuals in regard to their structure and ***-and ethnicity-specific brain templates facilitate establishing unbiased pediatric brain growth charts,indicating the necessity of the brain charts and brain templates generated in *** templates and growth charts as well as related codes have been made freely available to the public for open neuroscience(https://***/zuoxinian/CCS/tree/master/H3/Growth Charts).

关键词： Growth charts Neuroimaging Ethnicity Brain templates Development

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