Macroprogramming abstractions provide abstract distributed data structures to simplify the programming of wireless embedded networks. However, none of the current macroprogramming systems provide debugging support for...
详细信息
ISBN:
(纸本)9781605587486
Macroprogramming abstractions provide abstract distributed data structures to simplify the programming of wireless embedded networks. However, none of the current macroprogramming systems provide debugging support for application development. We have developed MDB, a GDB-like post-mortem debugger for the MacroLab macroprogramming abstraction. In this demonstration, we show how MDB enables application development and debugging at a single level of abstraction. MDB eliminates the need for a programmer to reason about low-level event traces and message passing protocols, instead allowing debugging in terms of abstract data types. We expect MDB to fill a crucial link in the development cycle as a macroprogram progresses from the drawing board to real deployment.
Recent mobile devices are integrated with various kinds of sensors, thereby allowing people to capture what stationary sensing devices cannot easily acquire. We term the systemsthat exploit the ubiquity of the users ...
详细信息
ISBN:
(纸本)9781605587486
Recent mobile devices are integrated with various kinds of sensors, thereby allowing people to capture what stationary sensing devices cannot easily acquire. We term the systemsthat exploit the ubiquity of the users of such devices Human Probes. To realize a Human-Probe environment, our research group has examined the usefulness of pressure sensors embedded in shoes [2]. In this demonstration, we present our recent work that extends our previous research on embedded pressure sensors by considering complimentary uses of accelerometers so as to measure walkability in our everyday spaces. Pressure sensors and accelerometers are similarly useful for capturing the motion of pedestrians;however, the close examination of the signals from bothsensors reveals the strengths and the weaknesses of each, and suggests the possibility of their complimentary use to support Human Probes.
Wireless sensor network has been identified as being useful in a variety of domains including the battlefield and perimeter defense. these mission critical applications raise the concern for security in sensor network...
详细信息
ISBN:
(纸本)9781595937636
Wireless sensor network has been identified as being useful in a variety of domains including the battlefield and perimeter defense. these mission critical applications raise the concern for security in sensor network. Typical security problems identified include passive information gathering, subversion of a node, legitimate addition of a node to an existing sensor network, and so forth [1]. Under traditional routing concept, information security is usually ensured through high-level security protocols, but limited computational power and memory space in sensor nodes make traditional cryptographical techniques cumbersome to be implemented in sensor networks.
this paper presents how carrier frequency differences among transmitters affect concurrent transmission in wireless sensor networks. the carrier frequency differences cause two problems: reverse phase rotation and sig...
详细信息
ISBN:
(纸本)9781450320276
this paper presents how carrier frequency differences among transmitters affect concurrent transmission in wireless sensor networks. the carrier frequency differences cause two problems: reverse phase rotation and signal level fluctuations. the effects of these problems depend on modulation schemes. the demonstration shows these problems with moving images of superposed baseband signal and constellation transmitted from 1-6 nodes concurrently.
Linear Variable Differential Transformer (LVDT) based sensing systems are effective in structural health monitoring. However, the usable range and accuracy of these sensors are severely affected due to the non-lineari...
详细信息
ISBN:
(纸本)9781605587486
Linear Variable Differential Transformer (LVDT) based sensing systems are effective in structural health monitoring. However, the usable range and accuracy of these sensors are severely affected due to the non-linearity exhibited in their input-output characteristics. this work presents a Field Programmable Gate Array (FPGA) implementation of an Artificial Neural Network (ANN) based non-linearity compensator of a LVDT sensor. Functional Link Artificial Neural Network (FLANN), an improved version of the conventional neural networks has been implemented for simplicity. the result obtained from the FPGA implementation is in good agreement withthe simulation result in MATLAB.
this work proposes the novel use of spinning beacons for precise indoor localization. the proposed "SpinLoc" (Spinning Indoor Localization) system uses "spinning" (i.e., rotating) beacons to create...
详细信息
ISBN:
(纸本)9781595939906
this work proposes the novel use of spinning beacons for precise indoor localization. the proposed "SpinLoc" (Spinning Indoor Localization) system uses "spinning" (i.e., rotating) beacons to create and detect predictable and highly distinguishable Doppler signals for sub-meter localization accuracy. the system analyzes Doppler frequency shifts of signals from spinning beacons, which are then used to calculate orientation angles to a target. By obtaining orientation angles from two or more beacons, SpinLoc can precisely locate stationary or slow-moving targets. After designing and implementing the system using MICA2 motes, its performance was tested in an indoor garage environment. the experimental results revealed a median error of 40-50 centimeters and a 90% error of 70-90 *** work proposes the novel use of spinning beacons for precise indoor localization. the proposed "SpinLoc" (Spinning Indoor Localization) system uses "spinning" (i.e., rotating) beacons to create and detect predictable and highly distinguishable Doppler signals for sub-meter localization accuracy. the system analyzes Doppler frequency shifts of signals from spinning beacons, which are then used to calculate orientation angles to a target. By obtaining orientation angles from two or more beacons, SpinLoc can precisely locate stationary or slow-moving targets. After designing and implementing the system using MICA2 motes, its performance was tested in an indoor garage environment. the experimental results revealed a median error of 40 similar to 50 centimeters and a 90% error of 70 similar to 90 centimeters.
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...
详细信息
ISBN:
(纸本)9781605587486
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.
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...
详细信息
ISBN:
(纸本)9781605587486
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.
Portability is a major concern in developing applications for embedded devices such as Wireless sensor Networks (WSN). Abstractions of the hardware platform which are introduced by the operating system (OS) make possi...
详细信息
ISBN:
(纸本)9781605587486
Portability is a major concern in developing applications for embedded devices such as Wireless sensor Networks (WSN). Abstractions of the hardware platform which are introduced by the operating system (OS) make possible to develop code independent of the hardware, which can be reused in later deployments. However, the lack of standard APIs for the variety of OS in the domain of WSN restricts portability to those systems running the same OS. We present on-going work on the design and development of a portable operating system abstraction layer (OSAL), which achieves a complete abstraction of the OS architecture as well as a common API across multiple OS. Portability at the application level is effectively achieved thanks to a common set of primitives which abstract the underlaying OS and its particular architecture. We provide argumentation to highlight the efficiency of the OSAL and a general introduction to its features and design considerations. Moreover, we present a preliminary evaluation of the current implementation, which has proven to introduce minimal run-time overhead as well as negligible increase on the software footprint.
暂无评论