hh.sePublications
Change search
Refine search result
35363738 1851 - 1894 of 1894
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 1851.
    Yuan, Fang
    et al.
    Applied Informatics, Bielefeld University, 33615 Bielefeld, Germany.
    Swadzba, Agnes
    Applied Informatics, Bielefeld University, 33615 Bielefeld, Germany.
    Philippsen, Roland
    Robotics and Artificial Intelligence Lab., Stanford University, Stanford, 94305, United States.
    Engin, Orhan
    Applied Informatics, Bielefeld University, 33615 Bielefeld, Germany.
    Hanheide, Marc
    Applied Informatics, Bielefeld University, 33615 Bielefeld, Germany.
    Wachsmuth, Sven
    Applied Informatics, Bielefeld University, 33615 Bielefeld, Germany.
    Laser-Based Navigation Enhanced with 3D Time-of-Flight Data2009In: Robotics and Automation, 2009. ICRA '09. IEEE International Conference on, Washington, DC: IEEE Computer Society, 2009, p. 2844-2850Conference paper (Refereed)
    Abstract [en]

    Navigation and obstacle avoidance in robotics using planar laser scans has matured over the last decades. They basically enable robots to penetrate highly dynamic and populated spaces, such as people's home, and move around smoothly. However, in an unconstrained environment the twodimensional perceptual space of a fixed mounted laser is not sufficient to ensure safe navigation. In this paper, we present an approach that pools a fast and reliable motion generation approach with modern 3D capturing techniques using a Timeof-Flight camera. Instead of attempting to implement full 3D motion control, which is computationally more expensive and simply not needed for the targeted scenario of a domestic robot, we introduce a "virtual laser". For the originally solely laserbased motion generation the technique of fusing real laser measurements and 3D point clouds into a continuous data stream is 100% compatible and transparent. The paper covers the general concept, the necessary extrinsic calibration of two very different types of sensors, and exemplarily illustrates the benefit which is to avoid obstacles not being perceivable in the original laser scan.

  • 1852.
    Yusuf, Adewale
    et al.
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE).
    Lartey, Jerry
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE).
    Wareus, Vilhelm
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE).
    Network Admission Control (NAC)Securing end point devices2010Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    There have been remarkable growths in wireless communication networks in

    recent years; this is because of its merits over the wired networks such as

    Mobility and convenience. Wireless networks transmit the signal over the

    open air via radio waves of different frequencies, this makes it to be

    vulnerable to several attacks and anybody on the street can easily intercept the

    wireless data or inject new data into the entire network. There has been

    existence of wired equivalent privacy (WEP) protocol (IEEE 802.11i), which

    was designed for wireless network security. There were concerns of security

    vulnerabilities in WEP; this made it necessary for the implementation of

    another solution to overcome the weaknesses of the previous wireless

    network security. The IEEE 802.1X (port-based network admission control)

    which is defined on Extensible Authentication protocol (EAP) provides

    effective and efficient admission control to wireless and other networks

    devices [8].

    Our thesis investigates the efficiency of NAC (IEEE 802.1X) as a security

    solution, access different vendor solutions, protocols supported and look into

    the inter-operability of these various vendors. In as much as we support the

    premise of NAC being an excellent solution, we will also make brilliant

    recommendations in this thesis to be considered for future refinements of this

    security solution as well as deployment scenarios for the university network.

  • 1853.
    Zacarias, Iulisloi
    et al.
    Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
    Gaspary, Luciano Paschoal
    Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
    Kohl, Andersonn
    Brazilian Army, Brasília, Brasilien.
    Fernandes, Ricardo Q. A.
    Brazilian Army, Brasília, Brasilien.
    Stocchero, Jorgito M.
    Brazilian Army, Brasília, Brasilien.
    Pignaton de Freitas, Edison
    Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
    Combining Software-Defined and Delay-Tolerant Approaches in Last-Mile Tactical Edge Networking2017In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 55, no 10, p. 22-29, article id 8067679Article in journal (Refereed)
    Abstract [en]

    Network-centric warfare is a no-way-back trend in modern military operations. The application of this concept ranges from upper-level decision making echelons to troop guidance on the battlefield, and many studies have been carried out in this area. However, most of these are concerned with either the higher-level strategic networks, that is, the networks linking the higher echelons with abundant resources, satellite communications, or even a whole network infrastructure, or high-end TEN, representing resource-rich troops in the field, with military aircraft, battleships, or ground vehicles equipped with powerful wireless communication devices and (almost) unrestricted energy resources for communication. However, these studies fail to take into account the "last-mile TEN," which comprises resource constrained communication devices carried by troopers, equipping sensor nodes deployed in the field or small unmanned aerial vehicles. In an attempt to fill this gap in the studies on battlefield networking, this article seeks to combine software-defined and delay-tolerant approaches to support the diverse range of strict requirements for applications in the last-mile TEN. © 2017 IEEE.

  • 1854.
    Zacarias, Iulisloi
    et al.
    Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil.
    Schwarzrock, Janaína
    Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil.
    Gaspary, Luciano Paschoal
    Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil.
    Kohl, Anderson
    Brazilian Army, Brasilia, DF, Brazil.
    Fernandes, Ricardo Q. A.
    Brazilian Army, Brasilia, DF, Brazil.
    Stocchero, Jorgito M.
    Brazilian Army, Brasilia, DF, Brazil.
    Pignaton de Freitas, Edison
    Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil.
    Employing SDN to control video streaming applications in military mobile networks2017In: 2017 IEEE 16th International Symposium on Network Computing and Applications (NCA) / [ed] Aris Gkoulalas-Divanis, Miguel P. Correia, Dimiter R. Avresky, New York: IEEE, 2017, p. 1-4Conference paper (Refereed)
    Abstract [en]

    Video streaming is an important service provided by surveillance systems to enhance situation awareness. However, in military systems, data acquisition heavily depends on the network infrastructure. In this application domain, units are spread and the distance between the sources of data and the decision makers may be very large. In the case of video streaming, the demand for high network throughput poses some extra requirements on the network. Considering the mobility patterns of the military units and the diversity of the new generations of sensors, especially those used by Unmanned Aerial Vehicles (UAV), the configuration and the management of the network must be so dynamic and so sensitive to data flow parameters that manual configuration is not acceptable. For this reason, the capability of the network to configure itself to offer the necessary Quality of Service is a must. Using principles of Software Defined Networks (SDN), this paper presents an analysis of video streaming for military surveillance in which multiple UAVs are employed as data providers through an SDN-enabled network, with promising results. ©2017 by IEEE

  • 1855.
    Zacarias, Iulisloi
    et al.
    Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
    Schwarzrock, Janaína
    Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
    Gaspary, Luciano Paschoal
    Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
    Kohl, Andersonn
    Brazilian Army, Brasília, Brasilien.
    Fernandes, Ricardo Q. A.
    Brazilian Army, Brasília, Brasilien.
    Stocchero, Jorgito M.
    Brazilian Army, Brasília, Brasilien.
    Pignaton de Freitas, Edison
    Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
    Enhancing Mobile Military Surveillance Based on Video Streaming by Employing Software Defined Networks2018In: Wireless Communications & Mobile Computing, ISSN 1530-8669, E-ISSN 1530-8677, Vol. 2018, p. 1-12, article id 2354603Article in journal (Refereed)
    Abstract [en]

    Situation awareness in surveillance systems benefits from high-quality video streaming service. This is even more important considering military systems, in which delays in image transmission may have a significant impact on the decision-making process. However, in order to deliver high-quality video streaming service, the required network infrastructure may be prohibitively complex, or even completely impossible to deploy, if mobile data providers are considered. Moreover, the demand for high network throughput poses extra requirements on the network. Considering this context, this paper addresses the problem of highly mobile networks composed of unmanned aerial vehicles (UAVs) as data providers of a military surveillance system. The proposed approach to tackle the problem is based on a Software Defined Networking (SDN) approach aiming at providing the best routes to deliver the data, enhancing the end-user quality of experience. An extensive experimental campaign was performed by means of simulations and the acquired results provide solid evidence of the usefulness of this proposal.© 2018 Iulisloi Zacarias et al.

  • 1856.
    ZAGANIDIS, ANESTIS
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE).
    Self-organising Methods for Malfunction Prediction: A Volvo bus case study2015Independent thesis Advanced level (degree of Master (Two Years)), 30 credits / 45 HE creditsStudent thesis
    Abstract [en]

    This thesis project investigates approaches for malfunction prediction using unsupervised, self-organized models, with an orientation on bus fleets. Certain bus malfunctions are not predictable with conventional methods and preventive replacements are too costly and time consuming. Malfunctions that could result in interruption of service or on degradation of safety  are of high priority to predict.The settings of the desired application define the following constraints: definition of a model by an expert is not desirable as it is not a scalable solution, ambient conditions or usage schedule must not affect the prediction, data communication between the systems is limited so data must be compressed with relevant to the problem features. In this work, definition of normal or faulty operation is not handled by an expert, but using the Wisdom of the crowd idea and Consensus Self-organized models for fault detection (COSMO), or by the system's past state by monitoring an autoencoder's reconstruction error. In COSMO each system constructs a model describing its condition and then all distances between models are estimated to find the Most Central Pattern (MCP), which is considered the normal state of the system. The measure of deviation is the tendency of a system's model to be farther from the MCP after a sequence of observations, expressed as a probability that the deviation is incidental.  Factors that apply to the total of systems, such as the weather conditions are thus minimized.The algorithms approach the problem from the scopes of: linear and non linear relations between signals, distribution of values of a single signal, spectrum information of a single signal. This is achieved by constructing relevant models of each observed system (bus). The performance of the implemented algorithms is investigated using ROC curves and real bus fleet data, targeting at predicting a set of malfunctions of the air pressure system.More tests are performed using artificial data with injected malfunctions, to evaluate the performance of the methods. By applying the method on artificial data, the ability of different methods to detect different malfunctions is exhibited.

  • 1857.
    Zahouani, Hassan
    et al.
    Laboratoire de Tribologie et de Dynamique des Systèmes, Ecole Centrale de Lyon, Ecully, FRANCE; Ecole Nationale d'Ingénieurs, Saint-Etienne, France.
    Rosén, Bengt-Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Thomas, Tom R.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    10th International Conference on Metrology & Properties of Engineering Surfaces: Guest editorial2008In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 264, no 5-6, p. 381-381Article in journal (Refereed)
  • 1858.
    Zain-ul-Abdin,
    et al.
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Embedded Systems (CERES).
    Svensson, Bertil
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Embedded Systems (CERES).
    Specifying Run-time Reconfiguration in Processor Arrays using High-level language2010In: WRC 2010: 4th HiPEAC Workshop on Reconfigurable Computing, Pisa, 2010, p. 1-10Conference paper (Refereed)
    Abstract [en]

    The adoption of run-time reconfigurable parallel architectures for high-performance embedded systems is constrained by the lackof a unified programming model which can express both parallelism and reconfigurability. We propose to program an emerging class of reconfigurable processor arrays by using the programming model of occam-pi and describe how the extensions of channel direction specifiers, mobile data, dynamic process invocation, and process placement attributes can be used to express run-time reconfiguration in occam-pi. We present implementations of DCT algorithm to demonstrate the applicability of occam-pi to express reconfigurability. We concluded that occam-pi appears to be a suitable programming model for programming run-time reconfigurable processor arrays.

  • 1859.
    Zain-ul-Abdin,
    et al.
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES).
    Åhlander, Anders
    Business Area Electronic Defence Systems, Saab AB, Gothenburg, Sweden.
    Svensson, Bertil
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES).
    Programming Real-time Autofocus on a Massively Parallel Reconfigurable Architecture using Occam-pi2011In: Proceedings of the 19th Annual IEEE International Symposium on Field-Programmable Custom Computing Machines (FCCM'2011), Los Alamitos, Calif.: IEEE Computer Society, 2011, p. 194-201Conference paper (Refereed)
    Abstract [en]

    Recently we proposed occam-pi as a high-level language for programming massively parallel reconfigurable architectures. The design of occam-pi incorporates ideas from CSP and pi-calculus to facilitate expressing parallelism and reconfigurability. The feasability of this approach was illustratedby building three occam-pi implementations of DCT executing on an Ambric. However, because DCT is a simple and well studied algorithm it remained uncertain whether occam-pi would also be effective for programming novel, more complex algorithms.

    In this paper, we demonstrate the applicability of occam-pi for expressing various degrees of parallelism by implementinga significantly large case-study of focus criterion calculation inan autofocus algorithm on the Ambric architecture. Autofocus is a key component of synthetic aperture radar systems. Two implementations of focus criterion calculation were developedand evaluated on the basis of performance. The comparison of the performance results with a single threaded software implementation of the same algorithm show that the throughput of the two implementations are 11x and 23x higher than the sequential implementation despite a much lower (9x) clock frequency. The two designs are, respectively, 29x and 40x moreenergy efficient.

  • 1860.
    Zalden, Peter
    et al.
    Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, USA & Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, USA & European XFEL, Schenefeld, Germany.
    Quirin, Florian
    Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Duisburg, Germany.
    Schumacher, Mathias
    Institut für Theoretische Festkörperphysik, JARA-FIT and JARA-HPC, RWTH Aachen University, Aachen, Germany.
    Siegel, Jan
    Instituto de Optica, Consejo Superior de Investigaciones Científicas, Madrid, Spain.
    Wei, Shuai
    I. Physikalisches Institut and JARA-FIT, RWTH Aachen, Aachen, Germany.
    Koc, Azize
    Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Duisburg, Germany & Institut für Physik und Astronomie, Universität Potsdam, Potsdam, Germany.
    Nicoul, Matthieu
    Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Duisburg, Germany.
    Trigo, Mariano
    Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, USA & Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, USA.
    Andreasson, Björn Pererik
    Department of Physics, Lund University, Lund, Sweden.
    Enquist, Henrik
    Department of Physics, Lund University, Lund, Sweden.
    Shu, Michael
    Department of Applied Physics, Stanford University, Stanford, USA.
    Pardini, Tommaso
    Lawrence Livermore National Laboratory, Livermore, USA.
    Chollet, Matthieu
    Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, USA.
    Zhu, Diling
    Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, USA.
    Lemke, Henrik
    Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, USA & Paul Scherrer Institute, Villigen, Switzerland.
    Ronneberger, Ider
    Institut für Theoretische Festkörperphysik, JARA-FIT and JARA-HPC, RWTH Aachen University, Aachen, Germany.
    Larsson, Jörgen
    Department of Physics, Lund University, Lund, Sweden.
    Lindenberg, Aaron
    Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, USA & Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, USA & Department of Materials Science and Engineering, Stanford University, Stanford, USA.
    Fischer, Henry
    Institut Laue-Langevin, Grenoble, France.
    Hau-Riege, Stefan
    Lawrence Livermore National Laboratory, Livermore, USA.
    Reis, David
    Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, USA & Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, USA.
    Mazzarello, Riccardo
    Institut für Theoretische Festkörperphysik, JARA-FIT and JARA-HPC, RWTH Aachen University, Aachen, Germany.
    Wuttig, Matthias
    I. Physikalisches Institut and JARA-FIT, RWTH Aachen, Aachen, Germany & PGI 10 (Green IT), Forschungszentrum Jülich, Jülich, Germany.
    Sokolowski-Tinten, Klaus
    Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Duisburg, Germany.
    Femtosecond x-ray diffraction reveals a liquid–liquid phase transition in phase-change materials2019In: Science, ISSN 0036-8075, E-ISSN 1095-9203, Vol. 364, no 6445, p. 1062-1067Article in journal (Refereed)
    Abstract [en]

    In phase-change memory devices, a material is cycled between glassy and crystalline states. The highly temperature-dependent kinetics of its crystallization process enables application in memory technology, but the transition has not been resolved on an atomic scale. Using femtosecond x-ray diffraction and ab initio computer simulations, we determined the time-dependent pair-correlation function of phase-change materials throughout the melt-quenching and crystallization process. We found a liquid–liquid phase transition in the phase-change materials Ag4In3Sb67Te26 and Ge15Sb85 at 660 and 610 kelvin, respectively. The transition is predominantly caused by the onset of Peierls distortions, the amplitude of which correlates with an increase of the apparent activation energy of diffusivity. This reveals a relationship between atomic structure and kinetics, enabling a systematic optimization of the memory-switching kinetics. © 2019 American Association for the Advancement of Science.

  • 1861.
    Zeadally, Sherali
    et al.
    Univ Dist Columbia, Dept Comp Sci & Informat Technol, Network Syst Lab, Washington, DC 20008 USA..
    Hunt, Ray
    Univ Canterbury, Coll Engn, Dept Comp Sci & Software Engn, Christchurch 1, New Zealand..
    Chen, Yuh-Shyan
    Natl Taipei Univ, Dept Comp Sci & Informat Engn, San Shia, Taipei County, Taiwan..
    Irwin, Angela
    Univ S Australia, Sch Comp & Informat Sci, Mawson Lakes, SA 5095, Australia..
    Hassan, Aamir
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS).
    Vehicular ad hoc networks (VANETS): status, results, and challenges2012In: Telecommunications Systems, ISSN 1018-4864, E-ISSN 1572-9451, Vol. 50, no 4, p. 217-241Article in journal (Refereed)
    Abstract [en]

    Recent advances in hardware, software, and communication technologies are enabling the design and implementation of a whole range of different types of networks that are being deployed in various environments. One such network that has received a lot of interest in the last couple of years is the Vehicular Ad-Hoc Network (VANET). VANET has become an active area of research, standardization, and development because it has tremendous potential to improve vehicle and road safety, traffic efficiency, and convenience as well as comfort to both drivers and passengers. Recent research efforts have placed a strong emphasis on novel VANET design architectures and implementations. A lot of VANET research work have focused on specific areas including routing, broadcasting, Quality of Service (QoS), and security. We survey some of the recent research results in these areas. We present a review of wireless access standards for VANETs, and describe some of the recent VANET trials and deployments in the US, Japan, and the European Union. In addition, we also briefly present some of the simulators currently available to VANET researchers for VANET simulations and we assess their benefits and limitations. Finally, we outline some of the VANET research challenges that still need to be addressed to enable the ubiquitous deployment and widespead adoption of scalable, reliable, robust, and secure VANET architectures, protocols, technologies, and services.

  • 1862.
    Zeng, Yingfu
    et al.
    Rice University, TX, United States.
    Bartha, Ferenc
    Rice University, TX, United States.
    Taha, Walid
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES).
    Compile-Time Extensions to Hybrid ODEs2017In: Electronic Proceedings in Theoretical Computer Science, ISSN 2075-2180, E-ISSN 2075-2180, p. 52-70Article in journal (Refereed)
    Abstract [en]

    Reachability analysis for hybrid systems is an active area of development and has resulted in many promising prototype tools. Most of these tools allow users to express hybrid system as automata with a set of ordinary differential equations (ODEs) associated with each state, as well as rules for transitions between states. Significant effort goes into developing and verifying and correctly implementing those tools. As such, it is desirable to expand the scope of applicability tools of such as far as possible. With this goal, we show how compile-time transformations can be used to extend the basic hybrid ODE formalism traditionally supported in hybrid reachability tools such as SpaceEx or Flow*. The extension supports certain types of partial derivatives and equational constraints. These extensions allow users to express, among other things, the Euler-Lagrangian equation, and to capture practically relevant constraints that arise naturally in mechanical systems. Achieving this level of expressiveness requires using a binding time-analysis (BTA), program differentiation, symbolic Gaussian elimination, and abstract interpretation using interval analysis. Except for BTA, the other components are either readily available or can be easily added to most reachability tools. The paper therefore focuses on presenting both the declarative and algorithmic specifications for the BTA phase, and establishes the soundness of the algorithmic specifications with respect to the declarative one.

  • 1863.
    Zeng, Yingfu
    et al.
    Rice University, Houston, USA.
    Chad, Rose
    Rice University, Houston, USA.
    Taha, Walid
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES). Rice University, Houston, USA.
    Duracz, Adam
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES).
    Atkinson, Kevin
    Rice University, Houston, USA.
    Philippsen, Roland
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR - Center for Applied Intelligent Systems Research.
    Cartwright, Robert
    Rice University, Houston, USA.
    O'Malley, Marcia
    Rice University, Houston, USA.
    Modeling Electromechanical Aspects of Cyber-Physical Systems2016In: Journal of Software Engineering for Robotics, ISSN 2035-3928, E-ISSN 2035-3928, Vol. 7, no 1, p. 100-119Article in journal (Refereed)
    Abstract [en]

    Model-based tools have the potential to significantly improve the process of developing novel cyber-physical systems (CPS). In this paper, we consider the question of what language features are needed to model such systems. We use a small, experimental hybrid systems modeling language to show how a number of basic and pervasive aspects of cyber-physical systems can be modeled concisely using the small set of language constructs. We then consider four, more complex, case studies from the domain of robotics. The first, a quadcopter, illustrates that these constructs can support the modeling of interesting systems. The second, a serial robot, provides a concrete example of why it is important to support static partial derivatives, namely, that it significantly improves the way models of rigid body dynamics can be expressed. The third, a linear solenoid actuator, illustrates the language’s ability to integrate multiphysics subsystems. The fourth and final, a compass gait biped, shows how a hybrid system with non-trivial dynamics is modeled. Through this analysis, the work establishes a strong connection between the engineering needs of the CPS domain and the language features that can address these needs. The study builds the case for why modeling languages can be improved by integrating several features, most notably, partial derivatives, differentiation without duplication, and support for equations. These features do not appear to be addressed in a satisfactory manner in mainstream modeling and simulation tools.

  • 1864.
    Zeng, Yingfu
    et al.
    Rice University, Houston, TX, USA.
    Rose, Chad
    Rice University, Houston, TX, USA.
    Brauner, Paul
    Rice University, Houston, TX, USA.
    Taha, Walid
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES). Rice University, Houston, TX, USA.
    Masood, Jawad
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS).
    Philippsen, Roland
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR - Center for Applied Intelligent Systems Research.
    O'Malley, Marcia
    Rice University, Houston, TX, USA.
    Cartwright, Robert
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS). Rice University, Houston, TX, USA.
    Modeling Basic Aspects of Cyber-Physical Systems, Part II (Extended Abstract)2014In: 2014 IEEE International Conference on High Performance Computing and Communications, 2014 IEEE 6th International Symposium on Cyberspace Safety and Security, 2014 IEEE 11th International Conference on Embedded Software and Systems (HPCC, CSS, ICESS) / [ed] Randall Bilof, Piscataway, NJ: IEEE Computer Society, 2014, p. 550-557Conference paper (Refereed)
    Abstract [en]

    We continue to consider the question of what language features are needed to effectively model cyber-physical systems (CPS). In previous work, we proposed using a core language as a way to study this question, and showed how several basic aspects of CPS can be modeled clearly in a language with a small set of constructs. This paper reports on the result of our analysis of two, more complex, case studies from the domain of rigid body dynamics. The first one, a quadcopter, illustrates that previously proposed core language can support larger, more interesting systems than previously shown. The second one, a serial robot, provides a concrete example of why we should add language support for static partial derivatives, namely that it would significantly improve the way models of rigid body dynamics can be expressed. © 2014 IEEE.

  • 1865.
    Zensus, J. A.
    et al.
    Owens Valley Radio Observatory, California Institute of Technology, Pasadena, California, USA.
    Bååth, L.B.
    Onsala Space Observatory, Chalmers University of Technology, Gothenburg, Sweden & Owens Valley Radio Observatory, California Institute of Technology, Pasadena, California, USA.
    Cohen, M. H.
    Owens Valley Radio Observatory, California Institute of Technology, Pasadena, California, USA.
    Nicolson, G. D.
    Hartebeesthoek Radio Observatory, Johannesburg, South Africa.
    The inner radio jet of 3C2731988In: Nature, ISSN 0028-0836, E-ISSN 1476-4687, Vol. 334, no 6181, p. 410-412Article in journal (Refereed)
    Abstract [en]

    Radio maps of 3C273 obtained with very long baseline interferometry (VLBI) have been limited by low dynamic range and poor north-south resolution resulting from the low declination (2°) of this quasar1. Dramatic improvement can now be achieved using larger arrays and antennas in the Southern Hemisphere2,3. A new VLBI map, made at 5 GHz with angular resolution and dynamic range unsurpassed at this frequency for this source, shows a narrow jet extending to a projected distance lproj∼125 h-;1 parsecs from the core. Superluminal motion exists out to at least lproj≈46h-1 parsecs. Successive superluminal components emerge from the core and appear to move on a fixed curved path with similar speeds of about 1 milliarcseconds per year. © 1988 Nature Publishing Group.

  • 1866.
    Zhang, Chi
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE).
    Tic-tac-toe game design based on Xilinx FPGA2010Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    This design accomplished Tic-Tac-Toe game on Xilinx Spartan-IIE FPGA platformin VHDL. Firstly, designing the circuits and wiring on experiment board. Secondly,designing the algorithm and programming it in Active-HDL. Thirdly, synthesizingit in Synplicity Synplify Pro and then implementing it in Xilinx ISE developingsuite. Finally download it onto FPGA to run it.

    This design allows two players to play Tic-Tac-Toe game on the experiment board.Pressing the key, the corresponding LED will be light up to represent thechessman. There are two LEDs indicate whose turn next is. If the grid one wantsto place chessman has been taken up, then LCD will alarm it and ask the playerto replace it. The first player who forms 3 chessmen in a row, column or diagonalwins, LCD will display it and the three LEDs in the winning line will blink. If nobody wins after filling the whole chessboard, then LCD displays draw.

  • 1867.
    Zhang, F. J.
    et al.
    University of Manchester, Nuffield Radio Astronomy Laboratories, Macclesfield, UK.
    Bååth, L.B.
    Onsala Space Observatory, Chalmers University of Technology.
    THE SUBMILLIARCSECOND RADIO STRUCTURES OF THE 2 BL LAC OBJECTS MKN421 AND 0735 + 1781991In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 248, no 3, p. 566-571Article in journal (Refereed)
    Abstract [en]

    Very high-resolution (approximately 0.15 mas) VLBI hybrid maps of the two BL Lac objects Mkn421 and 0735 + 178 have been produced at lambda-1.35 cm. The structures of both sources are simple. Only an unresolved core is found in Mkn421. It is magnetic field dominated, and the motion of relativistic electrons is strongly restrained by the magnetic field. Relativistic electrons with relatively low energy are responsible for the synchrotron radiation. The maps of 0735 + 178 show that the radio structure at lambda-1.35 cm is dominated by a strong core, and there is a weak component outside. We can put a lower limit to the angular velocity of the outer component (0.32 +/- 0.03) mas yr-1, corresponding to an apparent transverse speed of (5.4 +/- 0.6)c which tallies with previous results. The outer component has an extension towards the south-east, a tendency also seen in the 6-cm VLBI maps. With our 1.35-cm VLBI observations, we demonstrate that it is possible to study a new component emerging from its core during an outburst and to study its behaviour on its way out.

  • 1868.
    Zhang, F. J.
    et al.
    Nuffield Radio Astronomy Laboratories, Jodrell Bank, Cheshire, U.K..
    Bååth, L.B.
    Onsala Space Observatory, Chalmers University of Technology, Gothenburg, Sweden.
    Chu, H.S.
    Purple Mountain Observatory, Academia Sinica, Nanking, China.
    What is responsible for the new outburst of 0735+178?1992In: Variability of Blazars: Proceedings of a conference in honour of the 100th anniversary of the birth of academician Yrjö Väisälä, held at Tuorla Observatory, University of Turku, Finland, January 6-10, 1991 / [ed] E. Valtaoja & M. Valtonen, Cambridge: Cambridge University Press, 1992, p. 234-237Conference paper (Refereed)
  • 1869.
    Zhang, F. J.
    et al.
    Nuffield Radio Astronomy Laboratories, University of Manchester, Cheshire, UK.
    Bååth, L.B.
    Onsala Space Observatory, Chalmers University of Technology, Gothenburg, Sweden.
    Spencer, R. E.
    Nuffield Radio Astronomy Laboratories, University of Manchester, Cheshire, UK.
    1404+286: A non-ideal calibrator for VLBI observations1994In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 281, no 3, p. 649-652Article in journal (Refereed)
    Abstract [en]

    The radio source 1404+286 was observed with global VLBI arrays at 5 and 1.67 GHz in 1990.88 and 1991.45 respectively. High quality maps are presented in this paper, and show the source to be resolved at both frequencies with a core-jet like structure extending approximately 6 mas in position angle approximately -145-degrees. The jet direction is similar in both maps. 1404+286 has often been used in the past as a flux density calibrator or a phase referencing source. Our results show that this source is not an ideal calibrator on VLBI scales.

  • 1870.
    Zhang, F.J.
    et al.
    Onsala Space Observatory, Chalmers University of Technology, Gothenburg, Sweden.
    Bååth, L.B.
    Onsala Space Observatory, Chalmers University of Technology, Gothenburg, Sweden.
    The radio fine structure of the BL Lacertae object Mk 4211990In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 236, no 1, p. 47-52Article in journal (Refereed)
    Abstract [en]

    The BL Lac object Markarian 421 (Mk 421) has been mapped using VLBI arrays at a wavelength of 6 cm on four epochs from 1980.41 to 1983.43. It has a core-jet like structure with the jet pointing to the direction of NW with a stable position angle of about -45 deg. Almost all of the flux variation is accounted for by the change of the peak flux density of a compact component in the core. The results show that Mk 421 may exhibit apparent superluminal motion with apparent transverse speeds of components of (1.92 + or - 0.03)c (from 1981.25 to 1981.94) and (1.79 + or - 0.23)c (from 1981.94 to 1983.43) for C1; and (1.36 + or - 0.22)c for C2. The position angles of both the components C1 and C2 are nearly the same as the position angle of the jet, and there is no significant change of position angle as they move away from the core.

  • 1871.
    Zhang, F.J.
    et al.
    Onsala Space Observatory, Chalmers University of Technology, Gothenburg, Sweden.
    Spencer, R.E.
    Nuffield Radio Astronomy Laboratories, Jodrell Bank, Macclesfield, Cheshire, United Kingdom.
    Schilizzi, R.T.
    Netherlands Foundation for Research in Astronomy, Dwingeloo, The Netherlands.
    Fanti, C.
    Dipartimento di Astronomia dell'Universita & Instituto di Radioastronomia CNR, Bologna, Italy.
    Bååth, L.B.
    Onsala Space Observatory, Chalmers University of Technology, Gothenburg, Sweden.
    Su, B.M.
    Yunnan Observatory, Chinese Academy of Sciences, Kunming, China.
    Are there two engines at the center of 3C 286?1994In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 287, no 1, p. 32-37Article in journal (Refereed)
    Abstract [en]

    This paper presents images of the compact steep-spectrum quasar 3C 286 obtained with global VLBI arrays at 4.99 and 1.66 GHz. The morphology appears to be intermediate between the core-jet types and grossly distorted objects. The central portion is resolved into two components of almost equal peak brightnesses and spectral indices. On the 1.66 GHz map, the jet extends in position angle approximately -136-degrees, up to a knot (W1) (approximately 75 mas from the component C2) from which it curves rapidly towards the west to form another knot (W2). It is possible that the VLBI jet bends further towards the secondary component separated from the core by approximately 2.6'' in p.a. -115-degrees seen in high dynamic range VLA or Merlin maps. The jet has a sinuous feature shown clearly on the 5 GHz map. There is a low brightness extension at the North (designated N1) shown on both the 1.66 and 5 GHz maps, which is connected to the component C1 and bends towards the east.

  • 1872.
    Zhang, Fu-Jung
    et al.
    Shanghai Observatory, Chinese Academy of Sciences, Shanghai, China.
    Bååth, Lars B.
    Halmstad University, School of Business and Engineering (SET).
    Combined-array images of An Archetypal CSS Source 3C286 At 18CM wavelength1997In: Gigahertz Peaked Spectrum and Compact Steep Spectrum Radio Sources, Proceedings of the 2nd Workshop, held in Leiden, The Netherlands, September 30 - October 2, 1996 / [ed] I.A.G. Snellen, R.T. Schilizzi, H.J.A. Roettgering and M.N. Bremer, Leiden: Leiden Observatory , 1997, p. 72-77Conference paper (Refereed)
  • 1873.
    Zhang, Fu-Jung
    et al.
    Shanghai Observatory, Chinese Academy of Sciences, Shanghai 200030, China.
    Bååth, Lars B.
    Halmstad University, School of Business and Engineering (SET).
    Viewing angles in some selected BL Lac objects1996In: Astrophysics and Space Science, ISSN 0004-640X, E-ISSN 1572-946X, Vol. 235, no 2, p. 195-205Article in journal (Refereed)
    Abstract [en]

    A selected subset of BL Lac objects were monitored with VLBI techniques at multifrequencies. Apparent superlumJnal motion and X-rays were detected in all of the monitored sources. From the observational data, kinematic parameters, geometric parameters and beaming effects for the 'core' of the selected BL Lac objects have been estimated. Our results indicate that some BL Lacs have large Lorentz factors and small viewing angles; relativistic beaming effects are strongly present in these sources. On the other hand, some BL Lacs have small Lorentz thctors; their viewing angles are quite large. It does not seem possible to avoid the fact that some BL Lac objects are not oriented particularly close to the line of sight. It conflicts with the basic assumption of the accepted theories for explaining the characteristics of BL Lac objects at present. Also, it seems that the BL Lac objects in the class I of the Burdige and Hewitt's classification have larger viewing angles than those int he class II. The whole BL Lac classification could be a misnomer: the sources classified as 'BL Lac objects' are a mixture of physically different populations with different parent objects.

  • 1874.
    Zhao, Yang
    et al.
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), MPE-lab.
    Zhang, Min
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), MPE-lab.
    The Ising Model on a Heavy Gravity Portfolio Applied to Default Contagion2011Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In this paper we introduce a model of default contagion in the financail market. The structure of the companies are represented by a Heavy Gravity Portfolio, where we assume there are N sectors in the market and in each sector i, there is one big trader and ni supply companies.The supply companies in each sector are directly inuenced by the bigtrader and the big traders are also pairwise interacting with each other.This development of the Ising model is called Heavy gravity portfolioand according to this, the relation between expectation and correlationof the default of companies are derived by means of simulations utilisingthe Gibbs sampler. Finally methods for maximum likelihood estimationand for a likelihood ratio test of the interaction parameter in the modelare derived.

  • 1875.
    Zhelezov, Dmitry
    et al.
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), MPE-lab.
    Yamshchikov, Ivan
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), MPE-lab.
    Liquidity and optimal consumption with random income2011Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In the first part of our work we focus on the model of the optimal consumption with a random income. We provide the three dimensional equation for this model, demonstrate the reduction to the two dimensional case and provide for two different utility functions the full point-symmetries' analysis of the equations. We also demonstrate that for the logarithmic utility there exists a unique and smooth viscosity solution the existence of which as far as we know was never demonstrated before.

    In the second part of our work we develop the concept of the empirical liquidity measure. We provide the retrospective view of the works on this issue, discuss the proposed definitions and develop our own empirical measure based on the intuitive mathematical model and comprising several features of the definitions that existed before. Then we verify the measure provided on the real data from the market and demonstrate the advantages of the proposed value for measuring the illiquidity.

  • 1876.
    Zheyuan, Liu
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES).
    Evaluation of platoon Application Enabled by Contemporary ETSI ITS-G5 Standards2015Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
  • 1877. Zhu, Yuanwen
    et al.
    Jia, Wang
    Migrating the New Horizon website to WordPress2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    There are different problems associated with a static website, such as management and content update. To address these problems, one alternative is to use Content Management System (CMS), such as WordPress. This project describes the process of migrating a static website to WordPress and adding six additional functionalities according to requirements from a company. In the meantime, theme is used to customize the website based on company’s requirements; specific WordPress plugins and widgets are used to implement additional requirements, including submenus, user registration and login, content update, Facebook and Twitter integration, and RSS support for the new content. Besides, solutions are given to resolve problems, such as the conflict with Internet Explorer (IE) and WordPress security issues. The outcome of this work allows the company to use WordPress to manage the website, to publish automatically new content into online social networking services, to provide customized information to registered users as well as to allow web syndication.Key words: Content Management System, Solution Stack, Static and dynamic website, WordPress

  • 1878.
    Zimmerman, Ewa
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab). Department of Computer and Systems Sciences, Stockholm University, Stockholm, Sweden.
    Guidelines for enhanced Intranet use: a study of dissemination of information to field workers within municipalities2004Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    The development and use of new technology enables our society and organizations to disseminate information very quickly. Citizens in the industrialized world have access to information using the World Wide Web and organizations can provide both customers and employees with information using intranets. This thesis investigates how municipalities disseminate information to employees using intranets or traditional communication channels such as telephone, mail, paper handouts and weekly-letters.

    Municipalities are good examples of organizations that have employees with limited access to technology and where a considerable number of the employees are working out in the field and do not have access to an intranet and its content during their daily work. The municipalities in Sweden implement intranets to disseminate information with the purpose of efficient communication with everyone in the organization simultaneously and to promote cooperation between various departments.

    A study of 10 municipalities in Sweden focusing on the dissemination of information through intranets is presented. Previous research shows that the content must be relevant, fill a need and add a value for the users otherwise the motivation for using it is lost. Therefore, an investigation of the publishing process and the routines of the information provider have been carried out with the purpose of determining how the intranets can be designed to satisfy these requirements. The most important question is how the users actually use an intranet when they have limited access to technical resources. To answer this question users have been interviewed to investigate their motivation, attitude and the information need in relation to dissemination. During the investigation three municipality employees were interviewed, the information provider, the middle-managers and the field workers. The interviews have focused on the following themes; the user's satisfaction, the content of the information, the information strategies, the available and used communication channels and finally the knowledge and awareness possessed by the actors regarding the potentials of the intranet.

    The results of the study will be presented as recommendations for municipalities and other organizations with a similar structure. The usefulness and the relevance of the guidelines were established through evaluation with the participating actors. The guidelines will support the organizations and dissemination of information to field workers in public organizations. They will also raise awareness and support the potentials of the intranet with regards to communication opportunities, discussion forums and sharing of experiences between departments.

  • 1879.
    Zsoldos, Andreas
    Halmstad University, School of Business, Engineering and Science.
    Study on biomass in semiaquatic insects (Odonata) over a 20-year period in central, Sweden.2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This study is about how biomass of dragonflies insects have changed over the past 20-years in a forested area of central Sweden. This was done by analysing previously collected Odonata larvae stored in ethanol where sampling effort corrects the weight per locality. The results display a small but significant biomass increase over past decades, going against the recently observed trend of biomass decline in insects. However, this biomass gain was not even between the families, the ones that increased the most was Aesnidae and Libelluidae.  The reasons for the observed increase are discussed, some possible suggestions are less disturbance in their environments and their ability to adapt due to their long evolution giving them a phenotypical advantage.

  • 1880.
    Åhlander, Anders
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES).
    Efficient parallell architectures for future radar signal processing2007Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The processing demands on future embedded radar signal processors may stretch to several trillions of floating-point operations per second (TFLOPS). This is an increase of two to three orders of magnitude realtive to the requirements of today. Still, the tight size and power constraints are unchanged. To meet this, new, highly parallel computer systems are needed. The systems should efficiently deliver very high performance as well as being general enough. Another challenge for future signal processors is the requirement for having huge working memories that are accessed in complicated patterns.

    This thesis analyses the challenges of two classes of radar signal processing applications, namely Space-Time Adaptive Processing (STAP), which represents performance-intensive applications, and Synthetic Aperture Radar (SAR) processing, which represents memory-intensive applications. In addition to the actual performance and memory aspects of the applications, the desire for low-effort application development and maintenance is taken into consideration.

    A multiple SIMD architecture is proposed for the STAP calculations. This architecture gives a combination of the high computational density in the SIMD processing modules with the overall flexibility provided on the system level. An embedded signal processing system based on the architecture is shown to be capable of TFLOPS class performance using standard CMOS VLSI technology available in the year 2001. The system is, for the given application domain, considered to have the same generality as commercial off-the-shelf (COTS) hardware, but has several years of time lead over COTS with regard to the computational performance.

    The studied SAR processing is characterized by operating on huge data sets and having varying, non-linear data access paths. For this, algorithm solutions and execution schemes in inerplay with a system parallelization approach are proposed. It is shown that it is possible to obtain efficient memory accesses, despite the omplicated memory access patterns. It is also shown that the computational burden from complex interpolation kernels can be reduced through extensive calculation reuse.

    Efficient engineering of complex applications in this context is discussed. The use of semi-transparent, platform-based development is demonstrated for STAP and SAR, and advocated for obtaining high engineering defficiency and long system sustainability, as well as high performance efficiency.

    The overall conclusion drawn from this work is that a solid knowledge of the application domain and its future requirements, in combination with an understanding of its interaction with computational architectures, potentially enables several years of lead time in the realization of new, advanced signal prodcessing products. The important requirements on programmability and sustainability must also be taken into account in order to achieve a viable signal processing solution.

  • 1881.
    Åhlén Mulio, Sandra
    Halmstad University, School of Business, Engineering and Science.
    Auchenorrhyncha community composition inrestored wetlands of different age in Southwest of Sweden:: Can different communities or species be used as indicators for naturalness?2015Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [sv]

    Våtmarker är hotade ekosystem som är artrika och tillhandahåller viktiga ekosystemtjänster. Man började restaurera våtmarker i Sverige som åtgärd inom jordbruket för minskad avrinning av närsalter, men senare även ur bevarandebiologiskt perspektiv. Främst riktades insatserna mot fåglar och däggdjur, men numera även många insekter.

    Insekter används alltmer som indikatorer för olika ändamål och Auchenorrhyncha (stritar) utgör en sådan grupp som börjat få alltmer uppmärksamhet. Då de livnär sig på växtsaft, förekommer i stort sett överallt där vaskulära växter har sin utbredning och ofta har specifika krav på både habitat och födoväxter, uppfyller de därmed många av kraven som ställs på en indikatorart. Stritar valdes därför för att se om de kan nyttjas som indikatorer på restaurerade våtmarkers grad av “naturalness”.

    Håvning och uppsamling med modifierad lövblås användes för att samla stritarna. Analyser över artfördelningen I landskapet visade signifikanta resultat på en icke slumpartad fördelning av arterna över de olika insamlingslokalerna och indikatorarter kunde väljas varefter ett modifierat index användes för att uppskatta arternas kvalité. Statistiska analysmetoder applicerades på insamlade variabler, men utan signifikans. Jaccards coeffcient of community användes för att verifera effektiviteten av insamlingen och det visade sig att jag i snitt samlat 1/3 av de arter som finns i landskapet. Ett fåtal arter uppfyllde kraven och i kombination med ett index över naturalness kunde 4 slutgiltiga arter väljas som indikatorarter. Auchenorrhyncha kan användas som indikatorer på naturalness i restaurerade våtmarker men då resultatet av denna studie inte var övertygande i sig själv bör man i framtida studier kombinera indexmetoderna med andra analyser och taxa för en helhetsbild när det gäller bedömning av naturalness i restaurerade våtmarker. Nya fynd av stritar för Halland och en rödlistad art hittades också i och med detta arbete och kan ses som ett bidrag till en uppdaterad förekomstbild i det svenska landskapet.

  • 1882.
    Åkesson, Maria
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Digital Innovation in the Value Networks of Newspapers2009Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    After decades of digital developments, we are now entering a truly digital era. Digital information and communication technology has become a naturally embedded part ofthe designed environment we live in. Most parts of life are today pervaded by digital products and services. Evidence of such immersion can be noted in, for instance, media consumption. This development is gradually shaping and cultivating a media environment that is ubiquitous. Such ubiquity is manifested in media’s constant presence and thechanges in media consumption in the purview of digital innovation. Indeed, digital innovation is not only a shift in technology. It alters existing value networks and calls forrethinking existing value perceptions. While this disruptive change driven by digitizationcan be found in many industries, this thesis focuses on its impact on value networks in thenewspaper industry.The digitization of newspapers started with the introduction of the internet in the 90´sand soon emerged into new media innovations. While these new media innovations have not replaced existing media, they have been disruptive to newspaper value networks. Recently, the emergence of yet another digital innovation is specifically interesting whenstudying changes to value networks of the newspaper industry: the e-paper. This innovation (a screen technology very close to print on paper) exhibits inherent valuesthat make future replacement of print on paper a possibility. It is therefore regarded as avery promising technology in the newspaper industry. This thesis can be positioned at the intersection of the friction between forces to embarkon a new media trajectory and forces to hang on to the established structures andcontrol. The research question addressed in this thesis is: How are value networks of newspapers influenced by digital innovation? Addressing the research question, a multimethod approach was adopted to gain a broad understanding of how digital innovationinfluences value networks of newspapers. Drawing on digital innovation literature, the thesis presents a theoretical perspective with which to understand how digital innovation influences value networks. This perspective is instantiated as a model of value network configuration. The model emphasizes the multi-layered, dynamic, dialectic, and diametrical character of value networks in digital innovation. The model is offered as abasis and analytical tool to further explore value networks in digital innovation. This tool is useful for newspaper stakeholders when entering the digital era.

  • 1883.
    Åkesson, Maria
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Mobile service value: presenting the newspaper publisher view on how to attract users and advertisers2006In: Proceedings of the 29th IRIS, 2006, p. 19-Conference paper (Refereed)
    Abstract [en]

    This paper presents results from a study of news publisher’s perceptions of reader and advertiser value of mobile services. Literature on mobile service features and benefits has been used to discuss these values. The study was conducted in 10 European newspaper publishing organizations. The data on the value perceptions was analyzed iteratively to discover patterns of attributes, and resulted in a set of values for readers respectively advertisers. These finding suggest a re-shaped service model for newspaper publishers. The perception of reader values are availability, experience, relevance, sociability, and credibility, and of advertiser value mass coverage, targeting, tracking and mediating. This set of value attributes can be of guidance for content-providing organizations attempting to practice a value-centered approach to mobile service design.

  • 1884.
    Åkesson, Maria
    et al.
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Ihlström, Carina
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Towards a Ubiquitous Media Environment: Adding the e-newspaper Channel2006In: Proceedings of the Technical Association of the Graphic Arts, TAGA, Sewickley, USA: Technical Association of the Graphic Arts , 2006, p. 1-23Conference paper (Refereed)
    Abstract [en]

    As most of today’s media houses publish in multiple channels, theyalso exist in a multitude of infrastructures. Given the ongoing diffusion ofpersonal computers, handheld devices, and mobile telephones as well as theadvent of new technologies such as the e-paper, a new type of ubiquitousinformation environment is emerging. In this paper we give an update on thedevelopment of e-paper technology and provide a literature review ofinfrastructure issues in ubiquitous information environments. From empiricalresults from 19 interviews and 9 workshops with newspaper managers anddesigners in Sweden, Belgium, France and the Netherlands, we address thefollowing research question: What infrastructure considerations arise with theintroduction of a new channel in a ubiquitous media environment?

  • 1885.
    Åkesson, Maria
    et al.
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Ihlström Eriksson, Carina
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Advertising Challenges in Ubiquitous Media Environments2010In: Handbook of Research on Mobile Marketing Management / [ed] Key Pousttchi, Dietmar G Wiedemann, Hershey, PA: Business Science Reference , 2010, p. 77-93Chapter in book (Other academic)
    Abstract [en]

    Mobile advertising opportunities have attracted interest from industry and academics as a response to the trend of diffusion of new mobile technology. One industry particularly interested in new advertising opportunities is the newspaper industry. Many media houses envision a future multi-channel media environment supporting device independent, anytime, anywhere publishing, i.e. a Ubiquitous Media Environment (UME). In this paper we explore how ubiquitous advertising challenges the role of media houses. Ubiquitous advertising refers to advertising in a UME, anytime, anywhere and in any device. Based on results from interviews and workshops with advertisers and publishers we discuss how media houses traditional role is challenged. We contribute with an understanding of how media houses can develop their role to succeed with ubiquitous advertising and to m-advertising literature with insights into the dynamics of balancing consumer and advertiser value of ubiquitous advertising.

  • 1886.
    Åkesson, Maria
    et al.
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Ihlström Eriksson, Carina
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Designing and evaluating the calm electronic newspaper2006In: Proceedings of the 14th European Conference on Information Systems, ECIS 2006 / [ed] Jan Ljungberg, Göteborg: IT-universitetet, Göteborgs universitet , 2006, p. 12-Conference paper (Refereed)
    Abstract [en]

    This paper reports from an ongoing action research study concerning the design of the future e-newspaper, i.e. a newspaper on e-paper technology. The e-paper innovation is of great importance to the newspaper publishers since it has the potential of eventually replacing the printed newspaper due to its readability and high contrast. This study addresses the challenge of how to design calm user experience of the e-newspaper. The action research approach followed the canonical action research method, in collaboration with publisher, reader and advertiser clients. The activities include a range of data collection techniques such as project meetings, workshops, interviews and prototype testing. In the diagnosing phase we identified the core challenges for designing the e-newspaper which directed us to the literature of calm technology. Three design principles for calm user experience were formulated in the action planning phase, followed by designing three e-newspaper prototypes, which embeds the design principles, in the action taking phase. The prototypes were evaluated with 36 readers in the evaluating phase and the outcome of these evaluations was later assessed in collaboration with newspaper designers for specifying learning. The results indicate that the design principles support calm user experience.

  • 1887.
    Åkesson, Maria
    et al.
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Ihlström Eriksson, Carina
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Mobile Service Adoption: the Swedish Case Between 2006 and 20082008Conference paper (Refereed)
    Abstract [en]

    This paper describes the development of mobile service adoption between 2006 and 2008 using the Global Acceptance of Technology model (GAT) for categorization. Two online surveys were conducted, one in 2006 and one in 2008. The online questionnaires were presented at the web sites at two Swedish newspapers with comparable circulation. The sample from 2006 includes 131 respondents and the 2008 sample include 152 respondents. The samples have comparable distribution of gender, age and mobile phone penetration. The findings show a positive development in mobile service adoption in Sweden from 2006 to 2008, e.g. a large portion of the users have upgraded their mobile phones to 3G, the cost is nolonger an important barrier for adoption and users seem to be more acquainted with using mobile services and therefore do not regard mobile services to be as complicated. However, the value of mobile services was generally rated lower in 2008 than in 2006, suggesting a new challenge for the mobile service producers.

  • 1888.
    Åkesson, Maria
    et al.
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Ihlström Eriksson, Carina
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    The vision of ubiquitous media services: How close are we?2007In: Human interface and the management of information: Symposium on Human Interface 2007, held as part of HCI International 2007, Beijing, China, July 22 - 27, 2007 : proceedings. P. 2, Interacting in information environments / [ed] Michael J. Smith, Gavriel Salvendy, Berlin / Heidelberg: Springer Berlin/Heidelberg, 2007, p. 222-232Conference paper (Refereed)
    Abstract [en]

    The high penetration of mobile devices implies that we are closing up to the vision of ubiquitous media environments. This paper reports from a broad survey about barriers, use patterns, and motivations for using mobile media services. The aim is to contribute to the understanding of mobile service adoption process by studying users in different phases of the adoption process. The findings imply that mobile services are still not adopted and ubiquitously ingrained in use patterns. There is still a long way to go.

  • 1889.
    Åkesson, Maria
    et al.
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Thomsen, Michel
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Challenges to Newspapers in Digital Platform Ecosystems2015In: MCIS 2015 Proceedings, Mediterranean Conference on Information Systems (MCIS) , 2015, p. Paper 14-Conference paper (Refereed)
    Abstract [en]

    Incumbent content providers such as newspapers experience radical changes in their business environment. Digital platforms are becoming increasingly important to innovate digital media services and business. The generativity of digital platforms afforded by digital technology offers new opportunities, but also new challenges. Digital platforms exist in an ecosystem of complex networks of actorsand resources. In this paper we shed light on the challenges for incumbent content providers to adapt to and realize business opportunities in digital platforms. We do this from the viewpoints of newspaper management, platform provider and analysts of media business.

  • 1890.
    Åkesson, Maria
    et al.
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Thomsen, Michel
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Digital Innovation and Social Dilemmas2014In: Creating Values For All Through IT: IFIP WG 8.6 International Conference on Transfer and Diffusion of IT, TDIT 2014, Aalborg, Denmark, June 2-4, 2014. Proceedings / [ed] Bergvall-Kåreborn, Birgitta & Nielsen, Peter Axel, Heidelberg; New York; Dordrecht; London: Springer Berlin/Heidelberg, 2014, p. 49-61Conference paper (Refereed)
    Abstract [en]

    Digital innovation is rapidly reshaping society, affecting fundamental aspects of our everyday activities and lives. This development is accompanied with benefits as well as social dilemmas. In this paper we approach this class of challenges in IS digital innovation research. We investigate how social challenges are attended in research agendas, and reflect upon social challenges emerging from a digital service innovation project. Based on the empirical case, we present a scenario that illustrates how social challenges can unfold in digital service innovation. The case exemplifies three conflicts of interest that are used to discuss implications for the research agendas for digital innovation. We propose that explicit attention is paid to social and ethical challenges, taking a large scale and interdisciplinary approach on social and ethical challenges in digital ecosystems.

  • 1891.
    Åsedahl, Linnea
    et al.
    Halmstad University, School of Business, Engineering and Science.
    Lindmark, Alexandra
    Halmstad University, School of Business, Engineering and Science.
    Identifiering av riskzoner för större vilt inom Halmstad kommuns vägnät2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    An increased infrastructure is one of today’s biggest reasons for the fragmentation ofhabitats, making it harder for wildlife to move without risks when crossing roads. To see inwhich extent larger mammals crosses roads greenways were identified in the urban parts ofHalmstad municipality, after which a study was made on the presence of wildlife duringwinter 2015/2016. Ten areas were chosen along road 600 (Tylösandsvägen), road 610(Kustvägen), trunk road 15, trunk road 25 and trunk road 26 where inventories were carriedout for a period of seven days distributed over a period of two months. Wildlife abundanceof moose, roe deer, fallow deer, red deer, hare, wild boar, badger, red fox, wolf and lynxwere investigated by identification of track stamps in order to find out if any of the tenplaces constitutes a danger zone for wildlife-vehicle accidents and if there are anydifferences in wildlife abundance close to and further from the road as well as in woodlandand open land. The result of the study along with wildlife accident statistics show that someof the investigated areas form danger zones for larger animals; two adjacent areas alongtrunk road 26 and one area along trunk road 15. There were no significant difference inwildlife abundance on different distances from the road which means that wildlife followsthe greenways and do not see the road as an obstacle, thus more likely to crossover. Therewere also no significant difference in wildlife abundance in woodland and open land,meaning wildlife-vehicle accidents are not more likely to occur in one type of land over theother.

  • 1892.
    Åstrand, Björn
    et al.
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Johansson, Maria
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Segmentation of partially occluded plant leaves2006In: IWSSIP 200613th International Conference on Systems, Signals and Image ProcessingSeptember 21-23, 2006, Budapest, Hungary / [ed] Balázs Enyedi, András Reichardt, Stockholm: Harlequin , 2006Conference paper (Refereed)
    Abstract [en]

    N/A

  • 1893.
    Örnstedt, Julia
    Halmstad University, School of Business, Engineering and Science.
    Beredskapsplan vid livsmedelsrelaterade utbrott: En praktisk vägledning vid utredning av livsmedelsutbrott i mindre kommuner2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Livsmedelsburna sjukdomar är ett globalt problem som orsakar fleramiljoner dödsfall varje år, ändå tros den rapporterande siffran vara enbråkdel av hur många som drabbas. En anledning till svårigheten att vetaden verkliga summan av problemet är bristerna gällande rapportering avlivsmedelsbura sjukdomar.

    Även om Europa ligger i framkant medstrikta krav gällande säkerhet för mat uppkommer ständigt skandalersom visar på ett bristande system. Syftet med studien var att ta fram enberedskapsplan för matförgiftning och andra livsmedelsrelaterade utbrott.Målet var att ta fram en tydlig beredskapsplan som är lätt att användaoch som lämpar sig för mindre kommuner i Sverige.

    Litteraturundersökninggjordes för att samla information till bakgrund samt för att fåen övergripande blick över de olika livsmedelsburna sjukdomarna. Däreftergenomfördes en enkätundersökning gällande hur en beredskapsplanför livsmedelsrelaterade utbrott ser ut i Sveriges mindre kommuner.

    Resultatet visar att inte alla kommuner har en färdig beredskapsplan atttillgå vid större utbrott. Det som anses användbart i en sådan plan ärframförallt mallar för rutiner som exempelvis frågeformulär till densmittade vid en matförgiftning. En anledning till bristen på beredskapsplaneri mindre kommuner tros främst bero på bristande resurser, ökadpersonaltäthet hade enligt resultatet bidragit till ökad tillgång av beredskapsplaner.Utifrån de inkommande enkätsvaren har ett förslag på enberedskapsplan som är enkel att använda utformats.

  • 1894.
    Özdes, Denise Seher
    Halmstad University, School of Business and Engineering (SET), Biological and Environmental Systems (BLESS), Ecology and Environmental Science.
    Utfasning av miljö- och hälsofarliga kemikalieprodukter för att uppnå miljömålet "Giftfri miljö": Ett exempel från vård- och äldreomsorgsförvaltningen i Alingsås kommun2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Jag har valt att göra ett examensarbete för Alingsås kommun som går ut på att ta reda på vilka kemiska produkter som används inom vård och äldreomsorgen i Alingsås kommun samt komma med förslag och arbetsätt för Alingsås kommun att arbeta mer effektivt med deras utfasningsarbete. Genom att genomföra en litteratursammanställning av miljölagstiftningen, inventera kemikalie produkter som används i äldreboendena samt genomföra intervjuer om andra kommuners kemikaliearbete kan syftet med uppsatsen uppnås. Uppsatsen är en del av arbetet för att uppnå en del av Alingsås miljömål. Arbetet inleddes med en kemikalieinventering för samtliga äldre boenden där alla påträffbara rengöringsprodukter sammanställdes. De kemikalieprodukter som påträffades var rengöringsmedel för olika användningsområden. De rengöringsprodukter som inte var miljömärkta listades i en enskild lista och undersöktes. Meningen med undersökningen var att garantera att inga ämnen i produkterna var särskilt farliga för människors hälsa- och miljö. Resultatet av intervjuerna visade att det skiljer sig mellan olika kommuners kemikaliearbete men svaren visade också att alla kommuner arbetar med någon del som berör kemikaliearbetet men på olika nivåer. Litteraturstudien visar att miljömärkta produkter måste uppfylla en del krav för att bli miljömärkta, genom att använda sig av miljömärkta produkter bidrar man till att minska användingen av skadliga kemiska ämnen som påverkar miljö- och hälsa. Alingsås äldreboenden använder sig inte av några farliga rengöringsprodukter men en del av produkterna är inte miljömärkta som de borde vara enligt kommunens miljöpolicy och borde därför ersättas. Jämförelsevis utifrån de intervjuade kommunerna samt Alingsås kommun ligger Alingsås kommun på en bra nivå i sitt kemikaliearbete. En del bitar behöver utvecklas och med hjälp av enkla metoder kan man skapa ett bättre kemikaliearbete.

35363738 1851 - 1894 of 1894
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf