Radio spectrum has turned into a precious natural resource from free goods due to the rapid development of wireless communication technology. In order to efficiently utilize radio spectrum, a spectrum policy should be...
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ISBN:
(纸本)9781605585192
Radio spectrum has turned into a precious natural resource from free goods due to the rapid development of wireless communication technology. In order to efficiently utilize radio spectrum, a spectrum policy should be enough appropriate to create new industries and new technologies. From this point of view, we have developed a distributed spectrum sensing system which collects dense information of spectrum usage over large area. In this work, we discuss the requirements and the design of the distributed spectrum sensing system.
We present TinyVM, a Virtual Machine (VM) for nesC and C applications on sensor motes. TinyVM executes compressed bytecode on-the-fly to conserve memory. To facilitate creation of application-specific VMs, partitionin...
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ISBN:
(纸本)9781605585192
We present TinyVM, a Virtual Machine (VM) for nesC and C applications on sensor motes. TinyVM executes compressed bytecode on-the-fly to conserve memory. To facilitate creation of application-specific VMs, partitioning of applications into bytecode, VM instruction set extensions and machine-code is supported. We provide experimental evidence for the efficiency of TinyVM on Atmega128-based motes and on the Intel iMote2. TinyVM also runs on Windows and Linux, and we are currently porting TinyVM to Telos-based motes.
We present a method to extract topology information from detection events of mobile entities moving through a network of binary sensors. We extract the topological structure of possible paths in the network by analyzi...
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ISBN:
(纸本)9781605585192
We present a method to extract topology information from detection events of mobile entities moving through a network of binary sensors. We extract the topological structure of possible paths in the network by analyzing the time correlation of events at different sensors. the histograms of time delays between any two sensors contain the necessary information to reconstruct the network topology. this data is heavily corrupted by noise due to multiple agents in the network. We therefore use a mixture model of multiple Gaussian and a uniform distribution to explicitly isolate the noise. Our algorithm yields a graph representing the topology of our sensor network along with average travel time between nodes.
Software simulation has often been used to evaluate proposed protocols for wireless devices. Simulation allows for rapid development and testing, but does not provide a realistic RF environment. To compensate for this...
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ISBN:
(纸本)9781605585192
Software simulation has often been used to evaluate proposed protocols for wireless devices. Simulation allows for rapid development and testing, but does not provide a realistic RF environment. To compensate for this, field experiments are performed. However, problems encountered during field experiments can be difficult to locate and correcting problems on-site can be time-consuming. Emulations attempt to provide the advantages of simulation and field experiments without the suffering the disadvantages of both. this demo provides an overview of the hardware, software, and emulation capabilities of ASSERT, an emulation testbed.
Physicalnet is a fully implemented middleware for wireless networks of sensors and actuators (WNSAs). Based on a lightweight service oriented architecture (SOA), Physicalnet allows the users to create administrative d...
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ISBN:
(纸本)9781605585192
Physicalnet is a fully implemented middleware for wireless networks of sensors and actuators (WNSAs). Based on a lightweight service oriented architecture (SOA), Physicalnet allows the users to create administrative domains, in which owners of the nodes can share and protect their resources so that multiple applications can simultaneously use the same sensors and actuators with conflict resolution mechanisms. By using a general programming abstraction, named "bundle", Physicalnet allows programming across networks and administrative domains, and has a good support for node mobility. Other features of Physicalnet include using the Java language, supporting heterogeneous devices, and providing a chain of user tools.
We will demonstrate a wireless sensor network system for the surveillance of critical areas and properties -- e.g. borders. the system consists of up to 10 sensor nodes that monitor a small border area. the protocols ...
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ISBN:
(纸本)9781605585192
We will demonstrate a wireless sensor network system for the surveillance of critical areas and properties -- e.g. borders. the system consists of up to 10 sensor nodes that monitor a small border area. the protocols we show focus on detecting trespassers across a predefined area and reporting the detection to a gateway node securely. there, the trespasser's path will be graphically diplayed on a border map. the demonstration features secure protocols for the detection of trespassers, node failure and network partitioning, along with a duty cycle protocol to ensure network longevity. All information pertaining to relevant events in the network or border area will be graphically displayed on a gateway computer.
this demonstration shows the actual application of our wireless AMI[1] system, AMR Xpider. this system consists of a sink node and multiple relay nodes. Hundreds of sensing nodes, which are connected to the relay node...
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ISBN:
(纸本)9781605585192
this demonstration shows the actual application of our wireless AMI[1] system, AMR Xpider. this system consists of a sink node and multiple relay nodes. Hundreds of sensing nodes, which are connected to the relay node, transfer metering data to the MDMS (meter data management system). A total of 20,000 AMR Xpider units have been installed in apartments in South Korea for gas metering during the past three years. the AMR Xpider units are used for actual billing purposes. they operate with battery life of at least five years (generally, around seven years), with an average communication success rate of 98%.
RFID sensor networks comprising batteryless devices that are passively powered by RFID readers present exciting possibilities for ubiquitous computing applications. they require minimal maintenance, are cheap to manuf...
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ISBN:
(纸本)9781605585192
RFID sensor networks comprising batteryless devices that are passively powered by RFID readers present exciting possibilities for ubiquitous computing applications. they require minimal maintenance, are cheap to manufacture and have small form factor. However, their lack of autonomy due to the need for constant power from an RFID reader hinders their deployment. We demonstrate that RFIDs augmented with ambient energy-harvesting capabilities may be used as a first-class sensor platform, allowing them to operate untethered from reader infrastructure. Specifically, we show that a CRFID-based accelerometer sensor can provide both real-time and delayed access to time-stamped sensor data when provided with a small amount of solar energy. the data is collected using a standard RFID reader and displayed in a graphical interface.
Radio interference plays a central role for the performance of Wireless sensor Networks (WSN). Interference not only leads to packet loss, but it also affects the function of MAC and routing protocols. Hitherto, testi...
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ISBN:
(纸本)9781605585192
Radio interference plays a central role for the performance of Wireless sensor Networks (WSN). Interference not only leads to packet loss, but it also affects the function of MAC and routing protocols. Hitherto, testing the impact of interference on WSN experimentally has been difficult because of the unavailability of low-cost tools to create reproducible and well-controlled interference *** this demo we present a simple and inexpensive method to generate controllable and repeatable interference patterns for 802.15.4 devices. the demo is presented as a game, where a user is required to achieve a given interference level.
Within the PermaSense project, two wireless sensor networks have been deployed for a long-term operation in the Swiss Alps. For enabling state-of-the-art permafrost research based on the collected data, highest possib...
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ISBN:
(纸本)9781605585192
Within the PermaSense project, two wireless sensor networks have been deployed for a long-term operation in the Swiss Alps. For enabling state-of-the-art permafrost research based on the collected data, highest possible data quality and yield have to be ensured. But, the operation of wireless sensors networks remains a hard research problem. Firstly, deployed wireless sensors networks are subject to continuous changes. Second, there are scenarios that can only be tested in the field as the capabilities of testbeds are too limited. Basically, it is not possible to test for many months before deploying in the field. In this poster, we present an analysis of our data that has been collected over nine months. In addition to describing our system design and methods, we also share our experiences from discovered severe incidences.
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