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  • 1.
    Lindgren, Per
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Nordlander, Johan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Svensson, Linus
    Eriksson, Joakim
    Luleå University of Technology.
    Time for Timber2005Report (Other academic)
    Abstract [en]

    Embedded systems are often operating under hard real-time constraints, while at the same time being constrained by severe restrictions on power consumption. For such systems, robustness and reliability can be a question of life and death, which calls for rigorous system design and methodologies for validation. In this paper we advocate a design methodology for low-power, real-time systems, based on Timber; a pure reactive system model that allows for formal reasoning about various system properties. We outline how system specifications in Timber can be "compiled" into efficient standalone executables for general light- weight microcontroller based target platforms. Methods for resource analysis and implications to system dimensioning and validation are further discussed.

    Download full text (pdf)
    FULLTEXT01
  • 2.
    Lundberg, Magnus
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Eliasson, Jens
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Svensson, Linus
    Lindgren, Per
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Context aware power optimizations of wireless embedded Internet systems2004In: From the electrometer to the networked instruments: giant step toward a deeper knowledge : proceedings of the 21th IEEE Instrumentation and Measurement Technology Conference, Como, Italy, May 18 - 20, 2004 / [ed] Serge Demidenko, Piscataway, NJ: IEEE Communications Society, 2004, p. 91-95Conference paper (Refereed)
    Abstract [en]

    A key issue in research around embedded Internet systems (EIS) is to reduce power consumption. We envision EIS devices with lifetimes in the range of months or even years. This calls for developing aggressive power management techniques with a high degree of context awareness. As a first step towards this goal we introduce a design methodology for making context aware power optimizations of EIS. The presented design methodology which is verified by experimental results is a promising first step in prolonging operating time of battery powered wireless EIS.

    Download full text (pdf)
    FULLTEXT01
  • 3.
    Svensson, Linus
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Low-power embedded Internet system design2004Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Small mobile wireless sensors are used in many different areas, and they are expected to become even more common in the future as the miniaturisation of electronics continues. The current trend of connecting sensors into networks, or wireless sensor networks, is expected to continue and it has the potential to revolutionise our capability to monitor the physical world. To ensure communication compatibility and interoperability between sensors from different manufacturers within one sensor network, it is necessary to use standardised communication protocols. The most widespread network-independent protocol is IP, and we feel confident that IP will fill an important role in future sensor networks. For a number of reasons, including short development times and low development costs, a significant number of these systems are built using commercial-of-the-shelf (COTS) components. As development times and costs certainly will continue to be an issue which cannot be ignored, we believe that COTS components will be used in many future systems. Another issue is the power consumption: depending on the application area, the requirements on a system’s operational lifetime varies, but with few exceptions, low power consumption is a desired property. This thesis addresses the problem of designing low-power embedded internet systems (EIS) used in COTS-based sensor networks. A design methodology based on reactivity and analysability is presented. It is shown that a methodical choice of hardware components is not enough: thorough considerations regarding the software are also required. The purely reactive high-level language Timber is suggested as a suitable software model for implementing reactive and analysable systems. Timber’s strong type system, non-blocking execution model and implicit mutual exclusion, together with its capability to execute without an underlying operating system, endorse implementation of correct and robust systems. The deadline-based notion of Timber provides natural means to describe a system’s real-time behaviour. A method for automatic, accurate and safe static worst-case execution time (WCET) analysis of Timber is also presented. This is an important step towards schedulability analysis and low-power scheduling. Ultimately, reactive hardware together with a Timber-based software design methodology will relieve the system designer from the task of manual low-power optimisation.

  • 4. Östmark, Åke
    et al.
    Svensson, Linus
    Lindgren, Per
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Delsing, Jerker
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Mobile medical applications made feasible through use of EIS platforms2003In: Proceedings of the 20th IEEE Instrumentation and Measurement Technology Conference: IMTC '03, IEEE Communications Society, 2003, p. 292-295Conference paper (Refereed)
    Abstract [en]

    Monitoring of medical parameters often limits the mobility of the patient, eg., to the hospital. We present the first steps toward a solution where the patient is offered safety, while allowed the mobility to carry on with daily activities. A pulse oximeter is interfaced to a wireless sensor platform. The sensor system acts as a Bluetooth device providing a TCP/IP interface for configuration and maintenance. This allows user interaction through standardized WWW-browser technology. The sensor provides platform independent client software for data presentation. Sensor data can be transferred over IP/UDP and displayed in real time on the client device.

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