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  • 51.
    Tsiftes, Nicolas
    et al.
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Dunkels, Adam
    RISE, Swedish ICT, SICS.
    He, Zhitao
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Voigt, Thiemo
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Enabling Large-Scale Storage in Sensor Networks with the Coffee File System2009Conference paper (Refereed)
    Abstract [en]

    Persistent storage offers multiple advantages for sensor networks, yet the available storage systems have been unwieldy because of their complexity and device-specific designs. We present the Coffee file system for flash-based sensor devices. Coffee provides a programming interface for building efficient and portable storage abstractions. Unlike previous flash file systems, Coffee uses a small and constant RAM footprint per file, making it scale elegantly with workloads consisting of large files or many files. In addition, the performance overhead of Coffee is low: the throughput is at least 92\% of the achievable direct flash driver throughput. We show that network layer components such as routing tables and packet queues can be implemented on top of Coffee, leading to increased performance and reduced memory requirements for routing and transport protocols.

    Download full text (pdf)
    fulltext
  • 52.
    Tsiftes, Nicolas
    et al.
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Dunkels, Adam
    RISE - Research Institutes of Sweden (2017-2019), ICT, SICS.
    Voigt, Thiemo
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Efficient sensor network reprogramming through compression of executable modules2008Conference paper (Refereed)
  • 53.
    Tsiftes, Nicolas
    et al.
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Duquennoy, Simon
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Voigt, Thiemo
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Ahmed, Mobyen Uddin
    Mälardalen University, Sweden.
    Köckemann, Uwe
    Örebro University, Sweden.
    Loutfi, Amy
    Örebro University, Sweden.
    The E-Care@Home Infrastructure for IoT-Enabled Healthcare2016In: Internet of Things Technologies for HealthCare, Springer, 2016, 8, Vol. 187, p. 138-140Conference paper (Refereed)
    Abstract [en]

    The E-Care@Home Project aims at providing a comprehensive IoT-based healthcare system, including state-of-the-art communication protocols and high-level analysis of data from various types of sensors. With this poster, we present its novel technical infrastructure, consisting of low-power IPv6 networking, sensors for health monitoring, and resource-efficient software, that is used to gather data from elderly patients and their surrounding environment.

  • 54.
    Tsiftes, Nicolas
    et al.
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Eriksson, Joakim
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Dunkels, Adam
    RISE, Swedish ICT, SICS.
    Poster Abstract: Low-Power Wireless IPv6 Routing with ContikiRPL2010Conference paper (Refereed)
    Download full text (pdf)
    fulltext
  • 55.
    Tsiftes, Nicolas
    et al.
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Eriksson, Joakim
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Finne, Niclas
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Österlind, Fredrik
    RISE, Swedish ICT, SICS.
    Höglund, Joel
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Dunkels, Adam
    RISE, Swedish ICT, SICS.
    A Framework for Low-Power IPv6 Routing Simulation, Experimentation, and Evaluation2010Conference paper (Refereed)
    Abstract [en]

    Low-power networked devices, such as sensors and actuators, are becoming a vital part of our everyday infrastructure. Being networked, the continued development of these systems needs involvement of the networking community. We present a framework for simulation, experimentation, and evaluation of routing mechanisms for low-power IPv6 networking. The framework provides a detailed simulation environment for low-power routing mechanisms and allows the system to be directly uploaded to a physical testbed for experimental measurements.

  • 56.
    Tsiftes, Nicolas
    et al.
    RISE - Research Institutes of Sweden, ICT, SICS.
    Voigt, Thiemo
    RISE - Research Institutes of Sweden, ICT, SICS. Uppsala University, Sweden.
    Velox VM: A safe execution environment for resource-constrained IoT applications2018In: Journal of Network and Computer Applications, ISSN 1084-8045, E-ISSN 1095-8592, Vol. 118, p. 61-73Article in journal (Refereed)
    Abstract [en]

    We present Velox, a virtual machine architecture that provides a safe execution environment for applications in resource-constrained IoT devices. Our goal with this architecture is to support developers in writing and deploying safe IoT applications, in a manner similar to smartphones with application stores. To this end, we provide a resource and security policy framework that enables fine-grained control of the execution environment of IoT applications. This framework allows device owners to configure, e.g., the amount of bandwidth, energy, and memory that each IoT application can use. Velox's features also include support for high-level programming languages, a compact bytecode format, and preemptive multi-threading.

    In the context of IoT devices, there are typically severe energy, memory, and processing constraints that make the design and implementation of a virtual machine with such features challenging. We elaborate on how Velox is implemented in a resource-efficient manner, and describe our port of Velox to the Contiki OS. Our experimental evaluation shows that we can control the resource usage of applications with a low overhead. We further show that, for typical I/O-driven IoT applications, the CPU and energy overhead of executing Velox bytecode is as low as 1–5% compared to corresponding applications compiled to machine code. Lastly, we demonstrate how application policies can be used to mitigate the possibility of exploiting vulnerable applications.

    Download full text (pdf)
    veloxvm-preprint.pdf
  • 57.
    Voigt, Thiemo
    et al.
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Tsiftes, Nicolas
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    He, Zhitao
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Remote water monitoring with sensor networking technology2009In: ERCIM NewsArticle in journal (Refereed)
    Abstract [en]

    Sensor networks enable remote monitoring of natural environments such as glaciers, volcanoes and bodies of water. Within the project 'Sensor Networks to Monitor Marine Environment with Particular Focus on Climate Changes', SICS and partners are designing and implementing flexible, reprogrammable sensor network solutions suitable for monitoring the marine environment with high resolution in time and space.

  • 58.
    Voigt, Thiemo
    et al.
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Österlind, Fredrik
    RISE, Swedish ICT, SICS.
    Finne, Niclas
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Tsiftes, Nicolas
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    He, Zhitao
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Eriksson, Joakim
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Dunkels, Adam
    RISE, Swedish ICT, SICS.
    Båmstedt, Ulf
    Schiller, Jochen
    Hjort, Klas
    Sensor Networking in Aquatic Environments - Experiences and New Challenges2007Conference paper (Refereed)
    Abstract [en]

    In this paper we present the design and implementation of a small-scale marine sensor network. The network monitors the temperature in the Baltic Sea on different heights from the water surface down to the bottom. Unlike many other wireless sensor networks, this network contains both a wired and a wireless part. One of the major challenges is that the network is hard to access after its deployment and hence both hard- and software must be robust and reliable. We also present the design of an advanced buoy system featuring a diving unit that achieves a better vertical resolution and discuss remaining challenges of sensor networking in aquatic environments.

  • 59.
    Yazar, Dogan
    et al.
    RISE, Swedish ICT, SICS.
    Tsiftes, Nicolas
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Österlind, Fredrik
    RISE, Swedish ICT, SICS.
    Finne, Niclas
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Eriksson, Joakim
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Dunkels, Adam
    RISE, Swedish ICT, SICS.
    Demo Abstract: Augmenting Reality with IP-based Sensor Networks2010Conference paper (Refereed)
    Download full text (pdf)
    fulltext
  • 60.
    Österlind, Fredrik
    et al.
    RISE, Swedish ICT, SICS.
    Dunkels, Adam
    RISE, Swedish ICT, SICS.
    He, Zhitao
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Tsiftes, Nicolas
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Sensornet checkpointing between simulated and deployed networks2009In: IPSN'09, 2009, 1, , p. 2Conference paper (Refereed)
    Abstract [en]

    Sensor network development is notoriously difficult due to the low visibility of sensor platforms and systems. We propose sensornet checkpointing to increase the visibility of sensor networks. With sensornet checkpointing, we transfer network-wide application checkpoints between simulated and real networks. This approach enable advances in many research areas: visualization, repeatable experiments, fault injection, and application debugging. We demonstrate sensornet checkpointing on a network of Tmote Sky motes running Contiki.

    Download full text (pdf)
    fulltext
  • 61.
    Österlind, Fredrik
    et al.
    RISE, Swedish ICT, SICS.
    Dunkels, Adam
    RISE, Swedish ICT, SICS.
    Voigt, Thiemo
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Tsiftes, Nicolas
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Eriksson, Joakim
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Finne, Niclas
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Sensornet checkpointing: enabling repeatability in testbeds and realism in simulations2009In: 6th European Conference on Wireless Sensor Networks, 2009, 1Conference paper (Refereed)
    Abstract [en]

    When developing sensor network applications, the shift from simulation to testbed causes application failures, resulting in additional time-consuming iterations between simulation and testbed. We propose transferring sensor network checkpoints between simulation and testbed to reduce the gap between simulation and testbed. Sensornet checkpointing combines the best of both simulation and testbeds: the nonintrusiveness and repeatability of simulation, and the realism of testbeds.

    Download full text (pdf)
    fulltext
  • 62.
    Österlind, Fredrik
    et al.
    RISE, Swedish ICT, SICS.
    Mottola, Luca
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Voigt, Thiemo
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Tsiftes, Nicolas
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Dunkels, Adam
    RISE, Swedish ICT, SICS.
    Strawman: Resolving Collisions in Bursty Low-Power Wireless Networks2012Conference paper (Refereed)
    Download full text (pdf)
    fulltext
  • 63.
    Österlind, Fredrik
    et al.
    RISE, Swedish ICT, SICS.
    Wirström, Niklas
    RISE, Swedish ICT, SICS.
    Tsiftes, Nicolas
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Finne, Niclas
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Voigt, Thiemo
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Dunkels, Adam
    RISE, Swedish ICT, SICS.
    StrawMAN: Making Sudden Traffic Surges Graceful in Low-Power Wireless Networks2010Conference paper (Refereed)
    Download full text (pdf)
    fulltext
12 51 - 63 of 63
CiteExportLink to result list
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Cite
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  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
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  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf