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检索条件"机构=Computer Engineering and Networks Lab ETH"

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Demo abstract: IAssist - Rapid deployment and maintenance of tiny sensing systems

Demo abstract: IAssist - Rapid deployment and maintenance of...

引用

8th ACM International Conference on Embedded Networked Sensor Systems, SenSys 2010

作者： Keller, Matthias Hungerbuehler, Guido Knecht, Oliver Skeikh, Suhel Beutel, Jan Gubler, Stefanie Fiddes, Joel Gruber, Stephan Computer Engineering and Networks Lab. ETH Zurich Switzerland Department of Geography University of Zurich Switzerland

ISBN: (纸本)9781450303446

Commercial, coin-sized iButton temperature logger devices are well-suited for densely instrumenting large outdoor areas. An efficient workflow for deploying and maintaining those devices is necessary when striving to deploy and operate several hundreds of data logger devices. Additionally, a sophisticated data management is required for handling the emerging, large amounts of meta and measurement data. Therefore, we developed iAssist, a solution that integrates the handling of iButton data logger devices together with a GPS receiver and a digital camera for gathering accurate location information. iAssist efficiently supports the whole workflow consisting of deploying, relocating and reading tiny sensing systems. iAssist is especially tailored for outdoor operation asking for as little user interaction as possible. Copyright 2010 ACM.

关键词： Information management

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Poster abstract: Automatic configuration of controlled interference experiments in sensornet testbeds 12

Poster abstract: Automatic configuration of controlled inter...

引用

12th ACM Conference on Embedded Networked Sensor Systems, SenSys 2014

作者： Oppermann, Felix Jonathan Boano, Carlo Alberto Zimmerling, Marco Römer, Kay Institute for Technical Informatics Graz University of Technology Austria Computer Engineering and Networks Lab ETH Zurich Switzerland

ISBN: (纸本)9781450331432

Experiments under controlled radio interference are crucial to assess the robustness of low-power wireless protocols. While tools such as Jamlab augment existing sensornet testbeds with realistic interference, it remains an error-prone and time-consuming task to manually select the set of nodes acting as jammers and their individual transmit powers. We present an automated configuration approach based on simulated annealing to overcome this problem. A preliminary evaluation based on two testbeds shows that our approach can find near-optimal solutions within at most a few hours. We believe our approach can facilitate the widespread adoption of controlled interference experiments by the sensornet community. Copyright 2014 ACM.

关键词： Testbeds

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Rupeas: Ruby powered event analysis DSL

Rupeas: Ruby powered event analysis DSL

引用

International Conference on Networked Sensing Systems

作者： Woehrle, Matthias Plessl, Christian Thiele, Lothar Computer Engineering and Networks Lab ETH Zurich Switzerland Paderborn Center for Parallel Computing University of Paderborn Germany

ISBN: (纸本)9781424479108

Wireless Sensor networks (WSNs) are unique embedded computer systems for distributed sensing of a dispersed phenomenon. As WSNs are deployed in remote locations for longterm unattended operation, assurance of correct functioning of the system is of prime concern. Thus, the design and development of WSNs requires specialized tools to allow for testing. To this end, we present a novel language, Rupeas, for analyzing WSNs based on collected events during system operation. Rupeas is independent from test specifics and thus generally applicable for analyzing event logs of WSN test executions. © 2010 IEEE.

关键词： Wireless sensor networks

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On the potential of software rejuvenation for long-running sensor network deployments

On the potential of software rejuvenation for long-running s...

引用

2010 ICSE Workshop on Software engineering for Sensor Network Applications, SESENA 2010, in Conjunction with the 32nd ACM/IEEE International Conference on Software engineering, ICSE 2010

作者： Woehrle, Matthias Meier, Andreas Langendoen, Koen Computer Engineering and Networks Lab. ETH Zurich Switzerland Embedded Software Group Delft University of Technology Netherlands

ISBN: (纸本)9781605589695

Many sensor network systems encounter considerable problems after deployment despite extensive simulation and testing during the development. A fundamental issue is unforeseen problems that rarely occur, which makes them hard to reproduce. This work focuses on a class of problems that occur due to so-called software aging: The classical software engineering approach to handle software aging effects is software rejuvenation, i. e., the proactive reset of software components. In this positioning paper we discuss whether software rejuvenation can be applied to resource scarce sensor nodes, which are tightly coupled distributed system. We detail why and how software rejuvenation techniques are applicable to sensor networks and presents the basic building blocks required. © 2010 ACM.

关键词： Software testing

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MoMi: Model-based diagnosis middleware for sensor networks

MoMi: Model-based diagnosis middleware for sensor networks

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MidSens'09 - 4th International Workshop on Middleware Tools, Services and Run-Time Support for Sensor networks, Co-located with the 10th ACM/IFIP/USENIX International Middleware Conference

作者： De Jong, Adriaan Woehrle, Matthias Langendoen, Koen Embedded Software Group Delft University of Technology Netherlands Computer Engineering and Networks Lab. ETH Zurich Switzerland

ISBN: (纸本)9781605588513

Numerous deployments of Wireless Sensor networks (WSNs) have shown that intricate problems are introduced by deploying sensor nodes in an unknown and dynamic environment. Consequently, a vital part of a WSN deployment is the supervision of the sensor nodes and detection of abnormalities in their operation. Previous approaches have devised hand-crafted solutions to detect application-specific problems. This work proposes a generic middleware component, named MoMi, to detect such problems in a systematic way. Given a description of normal system behavior MoMi uses a Model-Based Diagnosis (MBD) framework to present the likely causes of system abnormalities to an administrator. This paper demonstrates a proof of concept implementation of MBD on sensor nodes and presents examples of its applicability for typical WSN applications. Copyright 2009 ACM.

关键词： Sensor nodes

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Chamaeleon - Exploiting multiple channels to mitigate interference

Chamaeleon - Exploiting multiple channels to mitigate interf...

引用

International Conference on Networked Sensing Systems

作者： Iyer, Venkatraman Woehrle, Matthias Langendoen, Koen Embedded Software Group Delft University of Technology Netherlands Computer Engineering and Networks Lab. ETH Zurich Switzerland

ISBN: (纸本)9781424479108

Due to their embedding into an unknown environment, wireless sensor networks are susceptible to adverse environmental conditions. A prime example is external interference, typically caused by 802.11, electric devices or co-located sensor networks, which can drastically influence communication. However, radios on sensor nodes provide multiple channels, which can help to alleviate interference problems on a particular channel. In this work, we introduce Chamaeleon, a novel lean, cross-layer protocol extension that helps to overcome external interference problems. Chamaeleon switches an affected set of nodes to a new channel based on key network parameters e.g., packet loss and channel backoffs. Initial simulation-based experiments show that Chamaeleon effectively handles the jamming of isolated channels. © 2010 IEEE.

关键词： Sensor nodes

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DiMo: Distributed node monitoring in wireless sensor networks

DiMo: Distributed node monitoring in wireless sensor network...

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11th ACM International Conference on Modeling, Analysis, and Simulation of Wireless and Mobile Systems, MSWiM'08

作者： Meier, Andreas Motani, Mehul Siquan, Hu Künzli, Simon Computer Engineering and Networks Lab. ETH Zurich Switzerland Electrical and Computer Engineering National University of Singapore Singapore Singapore Siemens Building Technologies Zug Switzerland

ISBN: (纸本)9781605582351

Safety-critical wireless sensor networks, such as a distributed fire- or burglar-alarm system, require that all sensor nodes are up and functional. If an event is triggered on a node, this information must be forwarded immediately to the sink, without setting up a route on demand or having to find an alternate route in case of a node or link failure. Therefore, failures of nodes must be known at all times and in case of a detected failure, an immediate notification must be sent to the network operator. There is usually a bounded time limit, e.g., five minutes, for the system to report network or node failure. This paper presents DiMo, a distributed and scalable solution for monitoring the nodes and the topology, along with a redundant topology for increased robustness. Compared to existing solutions, which traditionally assume a continuous data-flow from all nodes in the network, DiMo observes the nodes and the topology locally. DiMo only reports to the sink if a node is potentially failed, which greatly reduces the message overhead and energy consumption. DiMo timely reports failed nodes and minimizes the false-positive rate and energy consumption compared with other prominent solutions for node monitoring. Copyright 2008 ACM.

关键词： Topology

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Schedulability and end-to-end latency in distributed ECU networks: Formal modeling and precise estimation

Schedulability and end-to-end latency in distributed ECU net...

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6th Embedded Systems Week 2010, ESWEEK 2010 - 10th ACM International Conference on Compilers, Architecture and Synthesis for Embedded Systems, EMSOFT'10

作者： Rajeev, A.C. Mohalik, Swarup Dixit, Manoj G. Chokshi, Devesh B. Ramesh, S. General Motors Global Research and Development India Science Lab. Bangalore India Computer Engineering and Networks Lab ETH Zürich Zürich Switzerland

ISBN: (纸本)9781605589046

Embedded control systems in automobiles are typically implemented by a set of tasks deployed on multiple Electronic Control Units (ECUs) communicating via one or more buses like CAN or FlexRay. In the case of safety-critical systems, there are hard real-time bounds on the (i) response times of tasks/messages, and (ii) end-to-end latencies of certain task/message chains. These depend on various factors like the number of tasks (and messages) involved in the processing (and communication) sequence, parameters of these tasks/messages, scheduling policies, communication protocols, clock drifts, etc. Moreover, since the data transfer among tasks/messages is typically via asynchronous buffers that are overwritable and sticky, multiple semantics are possible for end-to-end latency. Hence, precise estimation of response times and end-to-end latencies in embedded systems is a non-trivial problem. In this paper, we propose a model-checking based technique to compute worst-case response times and end-to-end latencies. We consider a distributed system made of preemptively scheduled tasks and non-preemptively scheduled messages. Given a chain in the system, we estimate two different end-to-end latencies -LIFO and LILO- which are important in automotive domain. From a system description, we automatically synthesize a formal model based on a discrete event simulation formalism called Calendar Automata. It is then model-checked to compute response times and end-to-end latencies. Our technique is more scalable than the existing formal methods based techniques. We have illustrated this technique on reasonably large case-studies from the automotive domain.

关键词： Model checking

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Automated Pollen Detection with an Affordable Technology

Automated Pollen Detection with an Affordable Technology

引用

2020 International Conference on Embedded Wireless Systems and networks, EWSN 2020

作者： Cao, Nam Meyer, Matthias Thiele, Lothar Saukh, Olga Institute of Technical Informatics Graz University of Technology Austria Computer Engineering and Networks Lab ETH Zurich Switzerland Complexity Science Hub Vienna Austria

ISBN: (纸本)9780994988645

Airborne pollen cause seasonal allergies and the number of people affected increases yearly due to global warming and urbanization. Governmental pollen sensing stations are sampling traps which require manual pollen identification and counting by trained personnel in the lab. In the past years, a number of researchers and startups started working towards automated pollen measurements by exploring a wide range of techniques. Many solutions reported in the literature are expensive or work for a limited number of pollen species. In this paper, we present the design of a prototype of an automated and affordable pollen detection device built from off-the-shelf components. The design consists of three subsystems operating in the field and communicating the data to the backend server: (1) a particle trap with automatic filtering, (2) a particle concentration subsystem, and (3) a digital transmitted light microscope with layer-wise focus. The prototype shows effective particle gathering, filtering and concentration in a tiny-sized area. As a result, we reduce particle loss and improve image quality taken by the optical system when searching and focusing on pollen grains. The test results show that our device achieves high efficiency with up to 150 l/min air flow rates, evaluates over 90% of captured pollen grains, and achieves 1 h measurement delay on average (2 h at maximum). The prototype collects raw time-stamped microscopic images of pollen with 5-60 depth layers per sample depending on the number of objects contained in one sample. All images are transmitted to the backend server where we run a pollen detection algorithm to extract individual pollen grains from every image. We achieve 0.90 average precision and F1-score of 0.88 when detecting pollen in the images of individual layers taken in the field. Our prototype successfully operated in the wild for 115 days between April and August 2019, and shows high stability under a wide range of varying weather conditions, l

关键词： Global warming

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EvAnT: Analysis and checking of event traces for wireless sensor networks

EvAnT: Analysis and checking of event traces for wireless se...

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2008 IEEE International Conference on Sensor networks, Ubiquitous, and Trustworthy Computing, SUTC 2008

作者： Woehrle, Matthias Plessl, Christian Lim, Roman Beutel, Jan Thiele, Lothar ETH Zurich Computer Engineering and Networks Lab. 8092 Zurich Switzerland University of Paderborn Paderborn Center for Parallel Computing 33102 Paderborn Germany

ISBN: (纸本)9780769531588

Testing and verification methodologies for Wireless Sensor networks (WSN) systems in pre-deployment are vital for a successful deployment. Increased visibility of the internal state of a WSN application is established by instrumenting the application for logging execution traces at runtime. While the interpretation of the event traces is application-specific, a common method for analysis can be devised. This method should allow for a concise formulation of explorative queries to determine the occurrence and the cause of functional or performance problems. The contribution of this paper is an event analysis methodology that is implemented in the EvAnT framework. EvAnT allows for specifying queries that are executed on the collected traces. EvAnT is specifically tailored to WSN testing and debugging. We demonstrate the applicability of EvAnT by a case study in a building monitoring project. © 2008 IEEE.

关键词： Wireless sensor networks

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