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检索条件"任意字段=Proceedings of the 19th ACM Conference on Embedded Networked Sensor Systems"

共 791 条记录，以下是221-230 订阅

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Poster: Towards robust reprogrammability for wireless sensors 13

Poster: Towards robust reprogrammability for wireless sensor...

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13th acm conference on embedded networked sensor systems, SenSys 2015

作者： Tobias, Nicole Bolton, Connor Hester, Josiah Sitanayah, Lanny Sorber, Jacob School of Computing Clemson University United States

ISBN: (纸本)9781450336314

embedded systems that are wirelessly reprogrammed can be rendered useless by certain programming errors, excessive power consumption, or misconfigurations in the hardware. these types of situations can leave a device in a state that compromises its programmability, often rendering the device useless. Existing attempts to address the problem of robust wireless reprogramming have all been software-based solutions, that are vulnerable to certain errors, such as memory corruption, can corrupt the recovery programs. We propose a hardware-based solution to wireless reprogramming, physically separating the programmer and target device. this separation limits the propagation of errors, and ensures the device will always be recoverable. In this poster we will present the design and an early prototype of our approach - an ultra-low-power, low-cost hardware solution to ensure recovery from fatal errors and reprogrammability in wireless systems. this poster discusses the current system design, initial results, and system analysis from our current prototype. We also present future and ongoing directions, as well as key research questions. this work was funded by National Science Foundation grants CNS-1314342 and CNS-1453607. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation.

关键词： embedded systems

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Tragedy of the Coulombs: Federating Energy Storage for Tiny, Intermittently-Powered sensors 15

Tragedy of the Coulombs: Federating Energy Storage for Tiny,...

引用

13th acm conference on embedded networked sensor systems (SenSys)

作者： Hester, Josiah Sitanayah, Lanny Sorber, Jacob Clemson Univ Sch Comp Clemson SC 29631 USA

ISBN: (纸本)9781450336314

Untethered sensing devices have, for decades, powered all system components (processors, sensors, actuators, etc) from a single shared energy store (battery or capacitor). When designing batteryless sensors that are powered by harvested energy, this traditional approach results in devices that charge slowly and that are more error prone, inflexible, and inefficient than they could be. this paper presents a novel federated approach to energy storage, called UFoP, that partitions and prioritizes harvested energy automatically into multiple isolated smaller energy stores (capacitors). UFoP simplifies task scheduling, enables efficient use of components with differing voltage requirements, and produces devices that charge more quickly under identical harvesting conditions than a traditional centralized approach. We have implemented a UFoP reference design and conducted extensive experimental evaluation, including a short deployment. Our experimental results using an MSP430-based prototype show that UFoP provides as much as 10% more computational availability, and as much as four times more radio availability than the centralized approach. For all applications and energy environments evaluated, UFoP harvested 0.7-10.2% more energy than the centralized equivalent;meaning UFoP adds zero energy overhead.

关键词： Energy Harvesting Federated Energy Task Coupling Capacitor embedded System

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Poster abstract: Energy optimization framework in wireless sensor network 13

Poster abstract: Energy optimization framework in wireless s...

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13th acm conference on embedded networked sensor systems, SenSys 2015

作者： Esfahani, Niloufar P. Cerpa, Alberto E. Electrical Engineering and Computer Science University of California Merced United States

ISBN: (纸本)9781450336314

We present a holistic architecture for energy management in sensor networks. Our architecture is based on a modeldriven approach which attempts to (a) establish functional relationships across different components of the software stack and the interrelated parameters based on empirical data, (b) use the maximum sensor value and time-synchronization errors acceptable by the users of the sensor network application as input to establish minimum quality of service requirements, and (c) optimize the parameter values of all the software modules within the node's application stack to minimize total energy consumption for each sensor node. We explore the trade-offs of the design space by using a non-trivial application that includes sensing, time synchronization and routing modules and show that when using our architecture, we can provide energy savings in the average of 37% to 76% while still maintaining quality of service both in terms of the expected sensing and time-synchronization errors. We further show that even when using modules that perform significantly better than others with default values (e.g. ORW ∗ CTP), we can still reduce overall energy consumption by properly adjusting the parameters of lowest performance modules and provide energy savings in the average of 30% to 43%.

关键词： Quality of service

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Demo: Distributed MaxRS in Wireless sensor Networks 15

Demo: Distributed MaxRS in Wireless Sensor Networks

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13th acm conference on embedded networked sensor systems, SenSys 2015

作者： Hussain, Muhammed Mas-Ud Wongse-Ammat, Panitan Trajcevski, Goce Department of Electrical Engineering and Computer Science Northwestern University EvanstonIL60208 United States

ISBN: (纸本)9781450336314

this work presents a distributed implementation for processing Maximizing Range Sum (MaxRS) query in Wireless sensor Networks (WSN). MaxRS query is useful in many spatially-distributed event monitoring and target tracking applications. Given the location and current readings of the nodes, and a rectangle R, MaxRS finds a location of R that maximizes the sum of the readings of all the nodes covered by R. Our system performs MaxRS query in a userspecified time-interval λ and using the result obtained, attempts to maintain a certain degree of energy conservation in the WSN, based on a user-defined threshold δ. Since centralized processing of the raw readings and subsequently determining the MaxRS may incur significant communication overheads, we developed a distributed algorithm to compute MaxRS. We implemented our system in a heterogeneous WSN consisting of TelosB and SunSPOT motes, and illustrate the end-user tools: GUI for specifying required parameters, and real-time visualization of MaxRS solutions and estimated network energy consumption.

关键词： Energy utilization

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Poster abstract: Communicating "in the air"-studying the impact of UAVs on sensor network data collection 13

Poster abstract: Communicating "in the air"-studying the imp...

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13th acm conference on embedded networked sensor systems, SenSys 2015

作者： Jeong, Hoon Lee, Changwon Ryu, Jaehong Choi, Byeong-Cheol Ko, JeongGil Electronics and Telecommunications Research Institute Daejeon Korea Republic of Department of Software Convergence Technology Ajou University Suwon Korea Republic of

ISBN: (纸本)9781450336314

the commercialization of cheap unmanned aerial vehicles (UAVs) is starting to change the way we, as sensor network system designers, think of data collection. Specifically, UAVs provide a third dimension of mobile data collection as we can now traverse the sky with minimal obstacles, rather than rovering the ground with wheeled robots. However, despite UAVs or drones being an interesting platform with the potential to change sensor network deployment topologies, little do we understand on how data collection will perform "in the air". In this work we present a preliminary empirical study on the performance of aerial data collection using an IEEE 802.15.4 radio-equipped drone connecting itself to sensor nodes positioned on the ground. Our results show that a drone-based data collection platform outperforms that of an "at ground-level" data collection unit, despite being at identical distances. Based on this study, we identify the increased data collection height and "easy-to-achieve" lineof-sight as key features that make this possible.

关键词： Drones

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Poster: Exploring the need for sensor learning and collaboration in IoT-based parking systems 15

Poster: Exploring the need for sensor learning and collabora...

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13th acm conference on embedded networked sensor systems, SenSys 2015

作者： Huang, Yu Wu, Dian-Xuan You, Chuang-Wen Yang, Chi-Ling Lau, Seng-Yong Hua, Kai-Lung Cheng, Wen-Huang Chen, Yi-Ling Hsu, Jane Yung-Jen Intel-NTU CCC Center National Taiwan Univ. Taipei Taiwan Dept. of Computer Science and Information Eng. National Taiwan Univ. of Science and Technology Taipei Taiwan Dept. of Electrical Eng. National Taiwan Univ. Taipei Taiwan Research Center for Information Technology Academia Sinica Taipei Taiwan

ISBN: (纸本)9781450336314

the need to find parking contributes to road congestion and leads to unnecessary fuel consumption. Of all emerging parking systems, Internet-of-things (IoT)-based systems have demonstrated the feasibility of real-time delivery of parking availability using magnetic sensors. However, existing magnetic-based methods are prone to false positives caused by electromagnetic fields emitted from surrounding electric facilities. In this study, we conducted a 3-month data collection in a parking area. We identified the need to introduce learning and collaboration into the design of our detection algorithm which recognizes learned patterns associated with car arrivals or departures, and to filter out unreliable events based on spatial and temporal features.

关键词： Internet of things

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DrunkWalk: Collaborative and Adaptive Planning for Navigation of Micro-Aerial sensor Swarms 15

DrunkWalk: Collaborative and Adaptive Planning for Navigatio...

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13th acm conference on embedded networked sensor systems (SenSys)

作者： Chen, Xinlei Purohit, Aveek Dominguez, Carlos Ruiz Carpin, Stefano Zhang, Pei Carnegie Mellon Univ Pittsburgh PA 15213 USA UC Merced Merced CA USA

ISBN: (纸本)9781450336314

Micro-aerial vehicle (MAV) swarms are a new class of mobile sensor networks with many applications, including search and rescue, urban surveillance, radiation monitoring, etc. these sensing applications require autonomously navigating a high number of low-cost, low-complexity MAV sensor nodes in hazardous environments. the lack of preexisting localization infrastructure and the limited sensing, computing, and communication abilities of individual nodes makes it challenging for nodes to autonomously navigate to suitable preassigned locations. In this paper, we present a collaborative and adaptive algorithm for resource-constrained MAV nodes to quickly and efficiently navigate to preassigned locations. Using radio fingerprints between flying and landed MAVs acting as radio beacons, the algorithm detects intersections in trajectories of mobile nodes. the algorithm combines noisy dead-reckoning measurements from multiple MAVs at detected intersections to improve the accuracy of the MAVs' location estimations. In addition, the algorithm plans intersecting trajectories of MAV nodes to aid the location estimation and provide desired performance in terms of timeliness and accuracy of navigation. We evaluate the performance of our algorithm through a real testbed implementation and large-scale physical feature based simulations. Our results show that, compared to existing autonomous navigation strategies, our algorithm achieves up to 6x reduction in location estimation errors, and as much as 3x improvement in navigation success rate under the given time and accuracy constraints.

关键词： Mobile sensor Networks Micro-Aerial Vehicle Swarm

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Directional Transmissions and Receptions for High-throughput Bulk Forwarding in Wireless sensor Networks 15

Directional Transmissions and Receptions for High-throughput...

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13th acm conference on embedded networked sensor systems (SenSys)

作者： Varshney, Ambuj Mottola, Luca Carlsson, Mats Voigt, thiemo Uppsala Univ Uppsala Sweden Politecn Milan Milan Italy SICS Swedish ICT Kista Sweden

ISBN: (纸本)9781450336314

We present DPI: a wireless sensor network protocol for hulk traffic that uniquely leverages electronically switchable directional (ESD) antennas. Bulk traffic is found in several scenarios and supporting protocols based on standard antenna technology abound. ESL) antennas may improve performance in these scenarios;for example, by reducing channel contention as the antenna can steer the radiated energy only towards the intended receivers, a mid by extending the communication range at no additional energy cost. the corresponding protocol support, however, is largely missing. DPI addresses precisely this issue. First, while the network is quiescent, we collect link metrics across all possible antenna, configurations. We use this information to formulate a constraint satisfaction problem (CSP) that allows us to find two mqlti-hop disjoint paths connecting source and sink, along with the corresponding antenna configurations. Domain-specific heuristics we conceive ameliorate the processing demands in solving the CSP, improving scalability. Second, the routing configuration we obtain is injected back into the network. During the actual bulk transfer, the source funnels data through the two paths by quickly alternating between them. Packet forwarding occurs deterministically at every hop. this allows the source to implicitly "clock" the entire pipeline, sparing the need of proactively synchronizing the transmissions across the two paths. Our results, obtained in a real testbed using 802.15.4-compliant radios and custom ESD antennas we built, indicate that DPT approaches the maximum throughput supported by the link layer, peaking at 214 kbit/s in the settings we test. [GRAPHICS] .

关键词： Directional antennas Bulk data transmissions Wireless sensor networks Electronically controlled antennas

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PowerBlade A Low-Profile, True-Power, Plug-through Energy Meter 15

PowerBlade A Low-Profile, True-Power, Plug-Through Energy Me...

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13th acm conference on embedded networked sensor systems (SenSys)

作者： DeBruin, Samuel Ghena, Branden Kuo, Ye-Sheng Dutta, Prabal Univ Michigan Dept Elect Engn & Comp Sci Ann Arbor MI 48109 USA

ISBN: (纸本)9781450336314

We present PowerBlade, the smallest and lowest power AC plug load meter that measures real, reactive and apparent power, and reports this data, along with cumulative energy consumption, over an industry -standard Bluetooth Low Energy radio. Achieving this design point requires revisiting every aspect of conventional power meters: a new method of acquiring voltage;a non-invasive, planar method of current measurement;an efficient and accurate method of computing power from the voltage and current channels;a radio interface that leverages nearby smart phones to display data and report it to the cloud;and a retro power supply reimagined with vastly lower current draw, allowing extreme miniaturization. PowerBlade occupies a mere 1 '' by 1 '' footprint, offers a 1/16 '' profile, draws 176 mW continuously, offers 1.13% error on unity power factor loads in the 2-1200 W range and slightly worse for non-linear and reactive loads, and costs $11 in modest quantities of about 1000 units. this new design point enables affordable large-scale studies of plug-load energy usage-an area of growing national importance.

关键词： intermittent power smart meter data aggregation wireless sensor plug-load metering ac meter energy metering power metering

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Orchestra: Robust Mesh Networks through Autonomously Scheduled TSCH 15

Orchestra: Robust Mesh Networks Through Autonomously Schedul...

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13th acm conference on embedded networked sensor systems (SenSys)

作者： Duquennoy, Simon Al Nahas, Beshr Landsiedel, Olaf Watteyne, thomas SICS Swedish ICT Kista Sweden Chalmers Univ Technol Gothenburg Sweden Inria Rocquencourt France

ISBN: (纸本)9781450336314

Time slotted operation is a well-proven approach to achieve highly-reliable low-power networking through scheduling and channel hopping. It is, however, difficult to apply time slotting to dynamic networks as envisioned in the Internet of things. Commonly, these applications do not have pre-defined periodic traffic patterns and nodes can be added or removed dynamically. this paper addresses the challenge of bringing TSCH (Time Slotted Channel Hopping MAC) to such dynamic networks. We focus on low-power IPv6 and RPL networks, and introduce Orchestra. In Orchestra, nodes autonomously compute their own, local schedules. they maintain multiple schedules, each allocated to a particular traffic plane (application, routing, MAC), and updated automatically as the topology evolves. Orchestra (re) computes local schedules without signaling overhead, and does not require any central or distributed scheduler. Instead, it relies on the existing network stack information to maintain the schedules. this scheme allows Orchestra to build non-deterministic networks while exploiting the robustness of TSCH. We demonstrate the practicality of Orchestra and quantify its bene fits through extensive evaluation in two testbeds, on two hardware platforms. Orchestra reduces, or even eliminates, network contention. In long running experiments of up to 72 h we show that Orchestra achieves end-to-end delivery ratios of over 99.99%. Compared to RPL in asynchronous low-power listening networks, Orchestra improves reliability by two orders of magnitude, while achieving a similar latency-energy balance.

关键词： TSCH RPL Scheduling Wireless sensor Network

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