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检索条件"任意字段=6th ACM Conference on Embedded Networked Sensor Systems"

共 1172 条记录，以下是61-70 订阅

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Tiny Web Services: Design and Implementation of Interoperable and Evolvable sensor Networks 08

Tiny Web Services: Design and Implementation of Interoperabl...

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6th acm conference on embedded networked sensor systems

作者： Priyantha, Nissanka B. Kansal, Aman Goraczko, Michel Zhao, Feng Microsoft Research Redmond WA USA

ISBN: (纸本)9781595939906

We present a web service based approach to enable an evolutionary sensornet system where additional sensor nodes may be added after the initial deployment. the functionality and data provided by the new nodes is exposed in a structured manner, so that multiple applications may access them. the result is a highly inter-operable system where multiple applications can share a common evolving sensor substrate. A key challenge in using web services on resource constrained sensor nodes is the energy and bandwidth overhead of the structured data formats used in web services. Our work provides a detailed evaluation of the overheads and presents an implementation on a representative sensor platform with 48k of ROM, 10k of RAM and a 802.15.4 radio. We identify design choices that optimize the web service operation on resource constrained sensor nodes, including support for low latency messaging and sleep modes, quantifying trade-offs between the design generality and resource efficiency. We also prototyped an example application, for home energy management, demonstrating how evolutionary sensor networks can be supported with our approach.

关键词： web services TCP/IP battery life

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RFID sensor Networks with the Intel WISP 08

RFID Sensor Networks with the Intel WISP

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6th acm conference on embedded networked sensor systems

作者： Buettner, Michael Prasad, Richa Sample, Alanson Yeager, Daniel Greenstein, Ben Smith, Joshua R. Wetherall, David Univ Washington Seattle WA 98195 USA

ISBN: (纸本)9781595939906

We demonstrate a simple RFID sensor network comprised of an Intel WISP and a commodity UHF RFID reader. WISPs are devices that gather their operating energy from RFID reader transmissions, in the manner of passive RFID tags, and further include sensors, e.g., accelerometers, and provide a very small-scale computing platform. We believe that the small form factor and lack of battery makes the WISP an attractive alternative to motes for many of the original smart dust applications that require very small or long-lived sensors. the Intel WISP that we demonstrate has an ultra-low-power microcontroller, 32K of program space, 8K of flash, and accelerometer and temperature sensors. It harvests power from and communicates sensor data to standard (EPC Class 1 Gen 2) UHF RFID readers with a range of roughly 10 feet. this combination of RFID technology and sensor networks raises many research challenges, such as how to function with intermittent power and how to modify RFID protocols to support sensor queries.

关键词： rfid sensor networks

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MEDiSN: Medical Emergency Detection in sensor Networks 08

MEDiSN: Medical Emergency Detection in Sensor Networks

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6th acm conference on embedded networked sensor systems

作者： Ko, JeongGil Musaloiu-E, Razvan Lim, Jong Hyun Chen, Yin Terzis, Andreas Gao, Tia Destler, Walt Selavo, Leo Johns Hopkins Univ Baltimore MD 21218 USA

ISBN: (纸本)9781595939906

Staff shortages and an increasingly aging population are straining the ability of emergency departments to provide high-quality care. Moreover, there is a growing concern about the ability of hospitals to provide effective care during disaster events. Tools that automate patient monitoring would greatly improve efficiency, quality of care, and the volume of patients treated. Towards this goal, we have developed MEDiSN, a wireless sensor network for monitoring patients' vital signs in hospitals and disaster events. MEDiSN consists of Patient Monitors which are custom-built, patient-worn motes that sample, compress and secure medical data, and Relay Points that form a static multi-hop wireless backbone for carrying patient;data. Moreover, MEDiSN includes a back-end server that persistently stores medical data and presents them to multiple GUI clients. MEDiSN's heterogeneous architecture enables it to address the compound challenge of reliably delivering large volumes of data while meeting the application's QoS requirements.

关键词： sensor networks physiological monitoring collection tree protocol cc2420 security

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A Building Block Approach to sensornet systems 08

A Building Block Approach to Sensornet Systems

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6th acm conference on embedded networked sensor systems

作者： Dutta, Prabal Taneja, Jay Jeong, Jaein Jiang, Xiaofan Culler, David Univ Calif Berkeley Div Comp Sci Berkeley CA 94720 USA

ISBN: (纸本)9781595939906

We present a building block approach to hardware platform design based on a decade of collective experience in this area, arriving at an architecture in which general-purpose modules that require expertise to design and incorporate commonly-used functionality are integrated with application-specific carriers that satisfy the unique sensing, power supply, and mechanical constraints of an application. Of course, modules are widespread, but our focus is far less on the performance of any individual module and far more on an overall architecture that supports the prototype, pilot, and production stages of design, and preserves the artifacts and learnings accumulated along the way. We present heuristics for partitioning functionality between modules and carriers, and identify guidelines for their interconnection. Our approach advocates exporting a wide electrical interface, eliminating the system bus, and supporting many physical interconnect options for modules and carriers. We evaluate this approach by constructing a family of general-purpose modules and application-specific carriers that achieve a high degree of reuse despite very different application requirements. We show that this approach shortens platform development time-to-result for novice graduate students, making custom platforms broadly accessible.

关键词： Architecture Mote Wireless sensor Network

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Steady and Fair Rate Allocation for Rechargeable sensors in Perpetual sensor Networks 08

Steady and Fair Rate Allocation for Rechargeable Sensors in ...

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6th acm conference on embedded networked sensor systems

作者： Fan, Kai-Wei Zheng, Zizhan Sinha, Prasun Ohio State Univ Dept Comp Sci & Engn Columbus OH 43210 USA

ISBN: (纸本)9781595939906

Renewable energy enables sensor networks with the capability to recharge and provide perpetual data services. Due to low recharging rates and the dynamics of renewable energy such as solar and wind power, providing services without interruptions caused by battery runouts is non-trivial. Most environment monitoring applications require data collection from all nodes at a steady rate. the objective of this paper is to design a solution for fair and high throughput data extraction from all nodes in presence of renewable energy sources. Specifically, we seek to compute the lexicographically maximum data collection rate for each node, such that no node will ever run out of energy. We propose a centralized algorithm and an asynchronous distributed algorithm that can compute the optimal lexicographic rate assignment for all nodes. the centralized algorithm jointly computes the optimal data collection rate for all nodes along with the flows on each link, while the distributed algorithm computes the optimal rate when the routes are pre-determined. We prove the optimality for both the centralized and the distributed algorithms, and use a testbed with 155 sensor nodes to validate the distributed algorithm.

关键词： Rechargeable sensor Networks Rate Assignment

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Declarative Tracepoints: A Programmable and Application Independent Debugging System for Wireless sensor Networks 08

Declarative Tracepoints: A Programmable and Application Inde...

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6th acm conference on embedded networked sensor systems

作者： Cao, Qing Abdelzaher, Tarek Stankovic, John Whitehouse, Kamin Luo, Liqian Univ Illinois Dept Comp Sci Chicago IL 60680 USA

ISBN: (纸本)9781595939906

Effective debugging usually involves watching program state to diagnose bugs. When debugging sensor network applications, this approach is often time-consuming and error-prone, not only because of the lack of visibility into system state, but also because of the difficulty to watch the right variables at the right time. In this paper, we present declarative tracepoints, a debugging system that allows the user to insert a group of action-associated checkpoints, or tracepoints, to applications being debugged at runtime. Tracepoints do not require modifying application source code. Instead, they are written in a declarative, SQL-like language called TraceSQL independently. By triggering the associated actions when these checkpoints are reached, this system automates the debugging process by removing the human from the loop. We show that declarative tracepoints are able to express the core functionality of a range of previously isolated debugging techniques, such as EnviroLog, NodeMD, Sympathy, and StackGuard. We describe the design and implementation of the declarative tracepoints system, evaluate its overhead in terms of CPU slowdown, illustrate its expressiveness through the aforernentioned debugging techniques, and finally demonstrate that it can be used to detect real bugs using case studies of three bugs based on the development of the LiteOS operating system.

关键词： Declarative Tracepoints embedded Debugging Wireless Sellsor Networks

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Passive Diagnosis for Wireless sensor Networks 08

Passive Diagnosis for Wireless Sensor Networks

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6th acm conference on embedded networked sensor systems

作者： Liu, Kebin Li, Mo Liu, Yunhao Li, Minglu Guo, Zhongwen Hong, Feng Shanghai Jiao Tong Univ Shanghai Peoples R China

ISBN: (纸本)9781595939906

Network diagnosis, an essential research topic for traditional networking systems, has not received much attention for wireless sensor networks. Existing sensor debugging tools like sympathy or EmStar rely heavily on an add-in protocol that generates and reports a large amount of status information from individual sensor nodes, introducing network overhead to a resource constrained and usually traffic sensitive sensor network. We report in this study our initial attempt at providing a light-weight network diagnosis mechanism for sensor networks. We propose PAD, a probabilistic diagnosis approach for inferring the root causes of abnormal phenomena. PAD employs a packet marking algorithm for efficiently constructing and dynamically maintaining the inference model. Our approach does not incur additional traffic overhead for collecting desired information. Instead, we introduce a probabilistic inference model which encodes internal dependencies among different network elements, for online diagnosis of an operational sensor network system. Such a model is capable of additively reasoning root causes based on passively observed symptoms. We implement the PAD design in our sea monitoring sensor network test-bed and validate its effectiveness. We further evaluate the efficiency and scalability of this design through extensive trace-driven simulations.

关键词： Wireless sensor Networks Diagnosis

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Poster Abstract: HATBED - Hardware Assisted Tracing Testbed for embedded networked sensor systems 16

Poster Abstract: HATBED - Hardware Assisted Tracing Testbed ...

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16th conference on embedded networked sensor systems (SENSYS)

作者： Li, Yi Ma, Junyan Zhang, Te Changan Univ Sch Informat Engn Xian Shaanxi Peoples R China

ISBN: (纸本)9781450359528

embedded networked sensor systems are deeply coupled with the physical world, and the deployed systems are usually difficult to debug. therefore, it is especially important to thoroughly test and profile the systems before deploying to the real world. Traditional debugging methods are incompetent for detailed tracing on resource constrained devices due to their intrusiveness. this paper proposes a low-cost Hardware Assisted Tracing testBED (HATBED) to enable non-intrusive tracing and profiling for embedded networked sensor systems independent of operating systems and applications. We hope HATBED will foster research on comprehensive testing and profiling of embedded networked systems based on modern 32-bit architecture.

关键词： embedded networked systems Hardware assisted tracing Testbed

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Creating Greener Homes with IP-Based Wireless AC Energy Monitors 08

Creating Greener Homes with IP-Based Wireless AC Energy Moni...

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6th acm conference on embedded networked sensor systems

作者： Jiang, Xiaofan Dawson-Haggerty, Stephen Taneja, Jay Dutta, Prabal Culler, David Univ Calif Berkeley Div Comp Sci Berkeley CA 94720 USA

ISBN: (纸本)9781595939906

A home where every major appliance can be monitored for energy consumption and individually controlled wirelessly has long been a dream of gadgeteers and the green-conscious alike. Research has shown that real-time, per-appliance electricity usage feedback call induce behavior changes that lead to 10% to 20% reduction in usage [2]. We present acmE (AC Meter): an IP-based wireless device that provides real time energy usage measurement and control for AC devices. this device fills the gap between inexpensive watt-meters and expensive networked enterprise energy monitors. We show that acmE provides accurate measurement of active, reactive, and apparent energy from milli-amps to tens of amps. We also demonstrate its ability to remotely switch the connected appliance. In this demo, we will present a complete home monitoring system that integrates a set of acmEs with art 802.15.4-to-802.11 router and a web server. Energy measurements will be pushed directly into a database by the acmEs via UDP and retrieved by the web server continuously or on-demand to generate real-time graphs.

关键词： Architecture AC Meter Green Energy Power Platform Wireless sensor Network Mote Measurement

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IP is Dead, Long Live IP for Wireless sensor Networks 08

IP is Dead, Long Live IP for Wireless Sensor Networks

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6th acm conference on embedded networked sensor systems

作者： Hui, Jonathan W. Culler, David E. Univ Calif Berkeley Arch Rock Corp Berkeley CA 94720 USA

ISBN: (纸本)9781595939906

A decade ago as wireless sensor network research took off many researchers in the field denounced the use of IP as inadequate and in contradiction to the needs of wireless sensor networking. Since then the field has matured, standard links have emerged, and IP has evolved. In this paper, we present the design of a complete IPv6-based network architecture for wireless sensor networks. We validate the architecture with a production-quality implementation that incorporates many techniques pioneered in the sensor network community, including duty-cycled link protocols, header compression, hop-by-hop forwarding, and efficient routing with effective link estimation. In addition to providing interoperability with existing IP devices, this implementation was able to achieve an average duty-cycle of 0.65%, average per-hop latency of 62ms, and a data reception rate of 99.98% over a period of 4 weeks in a real-world home-monitoring application where each node generates one application packet per minute. Our results outperform existing systems that do not adhere to any particular standard or architecture. In light of this demonstration of full IPv6 capability, we review the central arguments that led the field away from IP. We believe that the presence of an architecture, specifically an IPv6-based one, provides a strong foundation for wireless sensor networks going forward.

关键词： network architecture internet internetworking wireless sensor networks IP IPv6 6LoWPAN media management

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