Fueled by the widespread adoption of sensor-enabled smart-phones, mobile crowdsourcing is an area of rapid innova-tion. Many crowd-powered sensorsystems are now part of our daily life { for example, providing highway...
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ISBN:
(纸本)9781450320276
Fueled by the widespread adoption of sensor-enabled smart-phones, mobile crowdsourcing is an area of rapid innova-tion. Many crowd-powered sensorsystems are now part of our daily life { for example, providing highway congestion information. However, participation in these systems can easily expose users to a significant drain on already limited mobile battery resources. For instance, the energy burden of sampling certain sensors (such as WiFi or GPS) can quickly accumulate to levels users are unwilling to bear. Crowd system designers must minimize the negative energy side-effects of participation if they are to acquire and maintain large-scale user populations. To address this challenge, we propose Piggyback Crowd-Sensing (PCS), a system for collecting mobile sensor data from smartphones that lowers the energy overhead of user participation. Our approach is to collect sensor data by exploiting Smartphone App Opportunities { that is, those times when smartphone users place phone calls or use ap-plications. In these situations, the energy needed to sense is lowered because the phone need no longer be woken from an idle sleep state just to collect data. Similar savings are also possible when the phone either performs local sensor computation or uploads the data to the cloud. To eficiently use these sporadic opportunities, PCS builds a light weight, user specific prediction model of smartphone app usage. PCS uses this model to drive a decision engine that lets the smartphone locally decide which app opportunities to exploit based on expected energy/quality trade-offs. We evaluate PCS by analyzing a large-scale dataset (con- taining 1,320 smartphone users) and building an end-to-end crowdsourcing application that constructs an indoor WiFi localization database. Our findings show that PCS can ef- fectively collect large-scale mobile sensor datasets (e.g., accelerometer, GPS, audio, image) from users while using less energy (up to 90% depending on the scenario) compared t
In smart building, services are stored as rules and achieved by rule analyzing and executing. However, the irrational contents of rules and conflicts between rules may bring confusion and maloperation in the rule syst...
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ISBN:
(纸本)9781479920815
In smart building, services are stored as rules and achieved by rule analyzing and executing. However, the irrational contents of rules and conflicts between rules may bring confusion and maloperation in the rule system. In this paper, we propose a lightweight rule verification and resolution framework to solve the problem which provides content anomaly detection and rule conflict detection. We also provide a quick resolution strategy for rule conflicts based on conflict-scenario-analysis so as to guarantee the rule system performing appropriately.
Natural scientists use large scale sensor networks for gathering and analyzing environmental data. However, the implementation work requires expert programmers. the problem is complicated by limited battery lifetime, ...
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ISBN:
(纸本)9781479920815
Natural scientists use large scale sensor networks for gathering and analyzing environmental data. However, the implementation work requires expert programmers. the problem is complicated by limited battery lifetime, processing power and memory capacity of the nodes, because this requires a low-level programming language. Since scientists are used to analyzing data with spreadsheets, researchers have studied the possibility of applying spreadsheet-based programming to sensor networks. the approaches so far either require a central server to execute the spreadsheet, or they execute a spreadsheet run-time on each node. the first approach causes higher communication cost since all data has to be routed to the central server and the second one causes computational overhead, because evaluating a spreadsheet is slower than executing handcrafted NesC-code. Hence, we present a spreadsheet driven tool-chain that can create efficient NesC-code and allows for simulation in the spreadsheet itself. the nodes have to recompute the spreadsheet formulas upon new data. However, we can avoid a large fraction of this recomputation by applying several optimization strategies during code generation. In our example scenario, sensor nodes compute the variance across a series of sensor readings. We can show that the optimizations save 65% CPU cycles and the code size decreases by 12% when compared to non-optimized execution of the spreadsheet. thus, our approach can deliver an easy way of developing sensor network programs while yielding very efficient code.
Recently, Wireless sensor Networks (WSNs) are spread all over the world, and are commonly used to collect physical information from the surrounding world. WSNs play a central role in the Internet of things (IoT) visio...
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ISBN:
(纸本)9781479920815
Recently, Wireless sensor Networks (WSNs) are spread all over the world, and are commonly used to collect physical information from the surrounding world. WSNs play a central role in the Internet of things (IoT) vision. IoT is a new paradigm that aims to integrate and connect anything at anytime, anyplace, with anything and by anyone. However, addressing objects is the main challenge for IoT. IPv6 over Low power Wireless Personal Area Networks (6LoWPAN) has been introduced to cope withthis issue. the emerging paradigm Social web of thing (SWoT) enables users to manage, access, share, and integrate smart objects with Social Network Site (SNS). this paper investigates different SWoT platforms and architectures, provides an overview of the current state-of-the-art on WSN communication standards.
the proceedings contain 75 papers. the topics discussed include: on the implications of the log-normal path loss model: an efficient method to deploy and move sensor motes;lossy links, low power, high throughput;indus...
ISBN:
(纸本)9781450307185
the proceedings contain 75 papers. the topics discussed include: on the implications of the log-normal path loss model: an efficient method to deploy and move sensor motes;lossy links, low power, high throughput;industry: beyond interoperability - pushing the performance of sensor network IP stacks;hierarchical aggregate classification with limited supervision for data reduction in wireless sensor networks;balancing energy, latency and accuracy for mobile sensor data classification;EasyTracker: automatic transit tracking, mapping, and arrival time prediction using smartphones;mobility prediction-based smartphone energy optimization for everyday location monitoring;acoustic shooter localization with a minimal number of single-channel wireless sensor nodes;stochastic radio interferometric positioning in the 2.4 GHz;CarMA: towards personalized automotive tuning;and EasiCPRS: design and implementation of a portable Chinese pulse-wave retrieval system.
We present SmartLoc, a localization system to estimate the location and the traveling distance by leveraging the lower-power inertial sensors embedded in smartphones as a supplementary to GPS. To minimize the negative...
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In spite of using unreliable resource-constrained devices, sensor networks can nowadays deliver 99.9% of their data with duty cycles well below 1%. this remarkable performance is, however, dependent on one or more of ...
ISBN:
(纸本)9781450320276
In spite of using unreliable resource-constrained devices, sensor networks can nowadays deliver 99.9% of their data with duty cycles well below 1%. this remarkable performance is, however, dependent on one or more of the following assumptions: low traffic rates, medium size densities and static nodes.
this interactive demo presents and compares two different paradigms for image analysis in visual sensor networks (VSN), using a testbed based on battery-operated Beagle-Bone platforms with sight and wireless communica...
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ISBN:
(纸本)9781450320276
this interactive demo presents and compares two different paradigms for image analysis in visual sensor networks (VSN), using a testbed based on battery-operated Beagle-Bone platforms with sight and wireless communication capabilities.
As embedded networks are evolving to open systems, it's becoming possible to create new applications on top of these existing embeddedsystems. However, developing new applications can be difficult due to the larg...
ISBN:
(纸本)9781450320276
As embedded networks are evolving to open systems, it's becoming possible to create new applications on top of these existing embeddedsystems. However, developing new applications can be difficult due to the large diversity of protocols that exist today. In this paper, the authors demonstrate how employing the CoAP protocol can enable rapid application development by re-using well-known principles from the Web development world. Furthermore, we also demonstrate how a number of extensions to CoAP help to lower the barrier for developing applications even further.
In this paper we introduce a novel sophisticated collusion attack scenario against a number of existing iterative filtering algorithms. To address this security issue, we propose an improvement for iterative filtering...
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ISBN:
(纸本)9781450320276
In this paper we introduce a novel sophisticated collusion attack scenario against a number of existing iterative filtering algorithms. To address this security issue, we propose an improvement for iterative filtering techniques by providing an initial approximation for such algorithms which makes them not only collusion robust, but also more accurate and faster converging.
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