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  • Afanasov, M., et al. (författare)
  • Flyzone A testbed for experimenting with aerial drone applications
  • 2019
  • Ingår i: MobiSys 2019 - Proceedings of the 17th Annual International Conference on Mobile Systems, Applications, and Services. - Association for Computing Machinery, Inc. - 9781450366618 ; s. 67-78
  • Konferensbidrag (refereegranskat)abstract
    • FlyZone is a testbed architecture to experiment with aerial drone applications. Unlike most existing drone testbeds that focus on low-level mechanical control, FlyZone offers a high-level API and features geared towards experimenting with application-level functionality. These include the emulation of environment influences, such as wind, and the automatic monitoring of developer-provided safety constraints, for example, to mimic obstacles. We conceive novel solutions to achieve this functionality, including a hardware/software architecture that maximizes decoupling from the main application and a custom visual localization technique expressly designed for testbed operation. We deploy two instances of FlyZone and study performance and effectiveness. We demonstrate that we realistically emulate the environment influence with a positioning error bound by the size of the smallest drone we test, that our localization technique provides a root mean square error of 9.2cm, and that detection of violations to safety constraints happens with a 50ms worst-case latency. We also report on how FlyZone supported developing three real-world drone applications, and discuss a user study demonstrating the benefits of FlyZone compared to drone simulators. 
  • Afanasov, Mikhail, et al. (författare)
  • Software Adaptation in Wireless Sensor Networks
  • 2018
  • Ingår i: ACM Transactions on Autonomous and Adaptive Systems. ; 12:4, s. 1-29
  • Tidskriftsartikel (refereegranskat)abstract
    • We present design concepts, programming constructs, and automatic verification techniques to support thedevelopment of adaptive Wireless Sensor Network (WSN) software. WSNs operate at the interface betweenthe physical world and the computing machine, and are hence exposed to unpredictable environment dynamics.WSN software must adapt to these dynamics to maintain dependable and efficient operation. Whilesignificant literature exists on the necessary adaptation logic, developers are left without proper support inmaterializing such a logic in a running system. Our work fills this gap with three key contributions: i) designconcepts help developers organize the necessary adaptive functionality and understand their relations,ii) dedicated programming constructs simplify the implementations, iii) custom verification techniques allowdevelopers to check the correctness of their design before deployment. We implement dedicated toolsupport to tie the three contributions, facilitating their practical application. Our evaluation considers representativeWSN applications to analyze code metrics, synthetic simulations, and cycle-accurate emulationof popular WSN platforms. The results indicate that our work is effective in simplifying the developmentof adaptive WSN software; for example, implementations are provably easier to test and to maintain, therun-time overhead of our dedicated programming construct is negligible, and our verification techniquesreturn results in a matter of seconds.
  • Ahlgren, Bengt, et al. (författare)
  • Increasing communication performance with a minimal-copy data path supporting ILP and ALF
  • 1996
  • Ingår i: Journal of High Speed Networks. - 0926-6801 .- 1875-8940. ; 5:2, s. 203-214
  • Tidskriftsartikel (refereegranskat)abstract
    • Many current implementations of communication subsystems on workstation class computers transfer communication data to and from primary memory several times. This is due to software copying between user and operating system address spaces, presentation la
  • Ahlgren, Bengt, et al. (författare)
  • Internet of Things for Smart Cities : Interoperability and Open Data
  • 2016
  • Ingår i: IEEE Internet Computing. - IEEE Computer Society. - 1089-7801. ; 20:6, s. 52-56
  • Tidskriftsartikel (refereegranskat)abstract
    • The Internet of Things (IoT) has become a promising technology for addressing societal challenges by connecting smart devices and leveraging Big Data analytics to create smart cities worldwide. As the IoT scales up, it's important to provide interoperability among different devices. Yet current simple standard protocols lack sufficient openness and interoperability. IoT for smart cities needs to guarantee the accessibility of open data and cloud services to allow industries and citizens to develop new services and applications. Here, the authors provide a case study of the GreenIoT platform in Uppsala, Sweden, to demonstrate the idea of interoperability and open data for smart cities.
  • Ahlgren, Bengt, et al. (författare)
  • The applicability of integrated layer processing
  • 1998
  • Ingår i: IEEE Journal on Selected Areas in Communications. - 0733-8716 .- 1558-0008. ; 16:3, s. 317-331
  • Tidskriftsartikel (refereegranskat)abstract
    • In this paper, we review previous work on the applicability and performance of integrated layer processing (ILP). ILP has been shown to clearly improve computer communication performance when integrating simple data manipulation functions, but the situati
  • Ahmed, Mobyen Uddin, 1976-, et al. (författare)
  • Run-Time Assurance for the E-care@home System
  • 2018
  • Ingår i: Part of the Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering book series (LNICST, volume 225). - 9783319762128 ; s. 107-110
  • Konferensbidrag (refereegranskat)abstract
    • This paper presents the design and implementation of the software for a run-time assurance infrastructure in the E-care@home system. An experimental evaluation is conducted to verify that the run-time assurance infrastructure is functioning correctly, and to enable detecting performance degradation in experimental IoT network deployments within the context of E-care@home. © 2018, ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering.
  • Ahniyaz, Anwar, et al. (författare)
  • Preparation of iron oxide nanocrystals by surfactant-free or oleic acid-assisted thermal decomposition of a Fe(III) alkoxide
  • 2008
  • Ingår i: Journal of Magnetism and Magnetic Materials. - 0304-8853 .- 1873-4766. ; 320:6, s. 781-787
  • Tidskriftsartikel (refereegranskat)abstract
    • A new non-hydrolytic, alkoxide-based route was developed to synthesize iron oxide nanocrystals. Surfactant-free thermal decomposition of the iron 2-methoxy-ethoxide precursors results in the formation of uniform iron oxide nanocrystals with an average size of 5.6 nm. Transmission electron microscope study shows that the nanocrystals are protected against aggregation by a repulsive surface layer, probably originating from the alkoxy-alkoxide ligands. Addition of oleic acid resulted in monodisperse nanocrystals with an average size of 4 nm. Mössbauer analysis confirmed that the nanocrystals mainly consisted of maghemite. Analysis of the magnetic hysteresis loop measurements and the zero field and field cooled measurements displayed an excellent fit to established theories for single-domain superparamagnetic nanocrystals and the size of the magnetic domains correlated well to the crystallite size obtained from transmission electron microscope.
  • Ahrentorp, Fredrik, et al. (författare)
  • Effective particle magnetic moment of multi-core particles
  • 2015
  • Ingår i: Journal of Magnetism and Magnetic Materials. - 0304-8853. ; 380, s. 221-226
  • Tidskriftsartikel (refereegranskat)abstract
    • In this study we investigate the magnetic behavior of magnetic multi-core particles and the differences in the magnetic properties of multi-core and single-core nanoparticles and correlate the results with the nanostructure of the different particles as determined from transmission electron microscopy (TEM). We also investigate how the effective particle magnetic moment is coupled to the individual moments of the single-domain nanocrystals by using different measurement techniques: DC magnetometry, AC susceptometry, dynamic light scattering and TEM. We have studied two magnetic multi-core particle systems BNF Starch from Micromod with a median particle diameter of 100 am and FeraSpin R from nanoPET with a median particle diameter of 70 nm - and one single-core particle system - SHP25 from Ocean NanoTech with a median particle core diameter of 25 nm.
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