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  • 551.
    Aghili, Mohammed
    Linköpings universitet, Institutionen för datavetenskap.
    Jämförelse av aggregeringswebbdelar i MOSS 20072010Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    En typisk funktion på startsidan till många webbportaler är den webbdel som presenterar exempelvis desenaste blogginläggen, nyheterna eller händelserna som har lagts till på webbplatsen. Dessa funktioner ärkända som aggreggeringswebbdelar. Eftersom startsidan är den sida som besöks mest jämfört med alla andrawebbsidor i portalen innebär det i sin tur att denna funktion utnyttjas väldigt ofta.Detta arbete syftar till att finna ett antal olika metoder som kan användas för att uppnå denna funktion ochatt ta reda på hur väl dessa webbdelar presterar.Denna rapport presenterar både de olika metoder som fanns och resultaten på en systematisk testning avdessa. Resultaten av testerna presenteras på ett överskådligt sätt.Slutligen dras slutsatser angående resultaten. Resultaten förespråkar inte en specifik metod, den metod somlämpar sig bäst för varje enskild sammanhang avgörs till största del av andra faktorer såsom frekvens avbesökare eller ändringar på innehållet som metoden söker igenom.

  • 552.
    Agiorgitis, Georgios
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för informatik (IK).
    ICTs use in the public Greek Primary Schools: the teachers' experiences2017Självständigt arbete på avancerad nivå (masterexamen), 80 poäng / 120 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Education is a sector that has the potential to become a critical area of action for the full exploitation of ICT. Educational systems of developed and developing countries have an ever-increasing tendency to apply ICT to education, in an attempt to prepare their students for the future's society. This thesis attempted to explore what kind of ICT is used in the Greek Primary Schools and develop an understanding on the relationship between the ICT and the teachers. The philosophical background is post-phenomenology and the methods chosen for collecting data for this research are policy document analysis and interviews. The empirical findings show that various ICT are being used in the classrooms of the Greek Primary Schools,  others widely and others occasionally. The research compares the legal framework revolving around ICT in Primary Schools in Greece, with the teachers' own experiences and shows that the guidelines suggested by the Greek Ministry of Education cannot be followed easily, due to economical and pedagogical reasons. It also investigates the ICT's effects on the teachers and the students through the teachers' own words and perceptions. The effects are mostly positive, there are mentioned however, some negative ones to take into consideration. Finally, the research presents a number of sectors where the participant teachers suggested there is room for improvement. By comparing the legal framework with the situation in the Primary Schools, this research adds a new perspective to the previous literature. The findings show that the current situation can be improved and the teachers' statements may trigger further research.

  • 553.
    Agiorgitis, Georgios
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för informatik (IK).
    Bennani, Mohamed
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för informatik (IK).
    Drakoularakos, Mixalis
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för informatik (IK).
    McConnon, Paul John
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för informatik (IK).
    Digital Wall: The University’s learning and information space2017Studentarbete övrigt, 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    A North American university is engaged in a large transformation project involving the wholeorganisation. Students, Lecturers, departments and additional questions from the shared leadership team are engaging in defining the services offered, in particular from the university library and its associated sub-services. It is an exciting time for the University as it seeks to not only define its services but also how these can be created and consumed.There are many aspects to this re-organisation and many items to be addressed. In this report,we look at the current situation at the University, as well as taking into account the aspirations of the stakeholders. We start by drawing out a Rich Picture, part of Soft System Methodology (SSM) (Checkland, 1981) which we use in order to spot opportunities that are available for further exploration. Much of the information that we use comes from material supplied by the University itself as well as interviews with the Head of Library services and Head of Library IT. We look indepth at how SSM assists in this process of evaluation through its focus on participation and how it may assist us to understand the many different perspectives collected in our research. SSM consequently assists in defining problems with solutions to any areas that have drawn our attention. Following the evaluation of collected data, discussions and our own observations, we identify that a digital wall that is being proposed for the redesigned library presents an opportunity to explore possibilities for exploitation of this technology. Further research on other digital walls such as Brisbane’s Cube (Abdi et al, 2014), and Auraria Library’s Discovery Wall(Burch, 2016) shows some of the uses that these walls have been put to and how the Institutions use them. We then use a number of models to evaluate the data that we collected on digital walls and from the North American University and analyse it in order to inform our thinking. These models can be used independently or collectively to evaluate data from different perspectives. As such we were able to look at problems and solutions from the perspective of many of the actors involved in shaping the future library services. These models and results are discussed in the report. Finally, we take our results and make a number of proposals for the North American University digital wall along with the relevant justifications at the end of this report.

  • 554. Agić, Zeljko
    et al.
    Tiedemann, Jörg
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Språkvetenskapliga fakulteten, Institutionen för lingvistik och filologi.
    Merkler, Danijela
    Krek, Simon
    Dobrovoljc, Kaja
    Moze, Sara
    Cross-lingual Dependency Parsing of Related Languages with Rich Morphosyntactic Tagsets2014Ingår i: Proceedings of the EMNLP’2014 Workshop on Language Technology for Closely Related Languages and Language Variants, 2014, s. 13-24Konferensbidrag (Refereegranskat)
  • 555.
    Agnesson, Daniel
    et al.
    Högskolan i Jönköping, Internationella Handelshögskolan, IHH, Informatik.
    Önder, Necip Yener
    Högskolan i Jönköping, Internationella Handelshögskolan, IHH, Informatik.
    Customer Maturity Analysis Tool: A case study in designing a Customer MaturityAnalysis Tool2010Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    The IT consultancy industry is characterized by knowledge intensive implementationprojects related to varying levels of standardized information system software. When faced with a large implementation project at a previously unknown customer various assessmentsis usually conducted to identify the level of fit between the software and organizationin order to plan and structure the implementation process. However, there are several aspects of the customer organization that potentially can affect the end result as well as the implementation process that is unrelated to the fit between the software and the implementation organization as well as the potency of the implementation method. By conducting measurements of these maturity factors within the customer organization the implementing procedure can be modified based on the customer maturity level in order to become more aligned with the capabilities present in the customer organization.

    Research question: Which aspects need to be covered by a Customer Maturity Analysis Tool (CMAT) in order to evaluate the pre implementation maturity for potential customersof our case company and how should these aspects be organized and measured? The first task of the research process was to create an underlying model of maturity perspectives and aspects to structure the literature review as well as the empirical data collection. It was decided to adhere to a deductive approach where the theoretical model would be validated and if necessary modified in accordance to feedback from potential users of the CMAT within the case company. This procedure was repeated in the creation of measurements and maturity levels for the aspects to be used in the tool. The research process would therefore transition from a general model based on literature review, through a iterative feedback loop to a final model tailored to the specific requirementsof the case company. The final CMAT ended up containing four main perspectives of customer maturity; ITi nfrastructure, Culture, Process and Business Governance. These four perspectives were in turn divided into subgroups in order to be able to aggregate and compare differentaspects of the perspectives with each other.

  • 556.
    Agnihotri, Mohit Kumar
    KTH, Skolan för informations- och kommunikationsteknik (ICT).
    Energy efficient topology formation for Bluetooth mesh networks using heterogeneous devices2015Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Internet of things (IoT) is the latest trend in our living spaces allowing machine to machine (M2M) communications at the extensive scale. To enable massive M2M communication and portable devices to run on limited power supplies for the extended duration of time, low-cost energy efficient wireless technologies are needed. Among the many competing technologies including Wi-Fi, Bluetooth has shown the potential to be one of the strong candidates to act as the connectivity solution for the IoT especially after the introduction of Bluetooth Low Energy (BLE). Nowadays BLE is one of the biggest players in the market of short-range wireless technologies. By 2020, nearly 30 billion BLE devices in the form of mobile phones, tablets, sports utilities, sensors, security systems and health monitors are expected to be shipped. This proliferation of low-cost devices may for the first time actualize the vision of IoT.

    This thesis studies various mesh topology formation techniques that can be used to aid the development of large-scale networks in capillary networks focusing on BLE. In particular, the thesis focuses on how mesh networks can be established over BLE communications especially exploiting the heterogeneous characteristics of the devices. A novel algorithm is proposed called Topology Formation considering Role Suitability (TFRS) to maximize the network lifetime. The algorithm uses a newly introduced metric called role suitability metric (RSM) to assign the best role among master, relay and slave to a device. The RSM metric bases its decision on various device characteristics including, but not limited to, energy, mobility, and computational capability. We use the system-level simulation to evaluate the performance of the proposed algorithm against a reference under homogeneous deployment scenario consisting of heterogeneous devices.

    Results show that the network lifetime can be improved significantly when the topology is formed considering the device characteristics for both master role selection and relay selection. TFRS can achieve moderate improvements ranging from 20% to 40% varying on the deployment characteristics over the reference case.

  • 557.
    Agrawal, P.
    et al.
    Uppsala Universitet.
    Ahlén, Anders
    Uppsala Universitet.
    Olofsson, Tomas
    Uppsala Universitet.
    Gidlund, Mikael
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för informations- och kommunikationssystem.
    Long Term Channel Characterization for Energy Efficient Transmission in Industrial Environments2014Ingår i: IEEE Transactions on Communications, ISSN 0090-6778, E-ISSN 1558-0857, Vol. 62, nr 8, s. 3004-3014Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    One of the challenges for a successful use of wireless sensor networks in process industries is to design networks with energy efficient transmission, to increase the lifetime of the deployed network while maintaining the required latency and bit-error rate. The design of such transmission schemes depend on the radio channel characteristics of the region. This paper presents an investigation of the statistical properties of the radio channel in a typical process industry, particularly when the network is meant to be deployed for a long time duration, e.g., days, weeks, and even months. Using 17–20-h-long extensive measurement campaigns in a rolling mill and a paper mill, we highlight the non-stationarity in the environment and quantify the ability of various distributions, given in the literature, to describe the variations on the links. Finally, we analyze the design of an optimal received signal-to-noise ratio (SNR) for the deployed nodes and show that improper selection of the distribution for modeling of the variations in the channel can lead to an overuse of energy by a factor of four or even higher.

  • 558.
    Agrawal, Piyush
    et al.
    Uppsala University.
    Ahlén, Anders
    Uppsala University.
    Olofsson, Tomas
    Uppsala University.
    Gidlund, Mikael
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för informations- och kommunikationssystem.
    Characterization of Long Term Channel Variations in Industrial Wireless Sensor Networks2014Ingår i: IEEE International Conference on Communications (ICC'14), IEEE conference proceedings, 2014Konferensbidrag (Refereegranskat)
  • 559.
    Agrawal, Vikas
    et al.
    IBM Research, , India.
    Archibald, Christopher
    Mississippi State University, Starkville, United States.
    Bhatt, Mehul
    University of Bremen, Bremen, Germany.
    Bui, Hung Hai
    Laboratory for Natural Language Understanding, Sunnyvale CA, United States.
    Cook, Diane J.
    Washington State University, Pullman WA, United States.
    Cortés, Juan
    University of Toulouse, Toulouse, France.
    Geib, Christopher W.
    Drexel University, Philadelphia PA, United States.
    Gogate, Vibhav
    Department of Computer Science, University of Texas, Dallas, United States.
    Guesgen, Hans W.
    Massey University, Palmerston North, New Zealand.
    Jannach, Dietmar
    Technical university Dortmund, Dortmund, Germany.
    Johanson, Michael
    University of Alberta, Edmonton, Canada.
    Kersting, Kristian
    Fraunhofer-Institut für Intelligente Analyse- und Informationssysteme (IAIS), Sankt Augustin, Germany; The University of Bonn, Bonn, Germany.
    Konidaris, George
    Massachusetts Institute of Technology (MIT), Cambridge MA, United States.
    Kotthoff, Lars
    INSIGHT Centre for Data Analytics, University College Cork, Cork, Ireland.
    Michalowski, Martin
    Adventium Labs, Minneapolis MN, United States.
    Natarajan, Sriraam
    Indiana University, Bloomington IN, United States.
    O’Sullivan, Barry
    INSIGHT Centre for Data Analytics, University College Cork, Cork, Ireland.
    Pickett, Marc
    Naval Research Laboratory, Washington DC, United States.
    Podobnik, Vedran
    Telecommunication Department of the Faculty of Electrical Engineering and Computing, University of University of Zagreb, Zagreb, Croatia.
    Poole, David
    Department of Computer Science, University of British Columbia, Vancouver, Canada.
    Shastri, Lokendra
    Infosys, , India.
    Shehu, Amarda
    George Mason University, Washington, United States.
    Sukthankar, Gita
    University of Central Florida, Orlando FL, United States.
    The AAAI-13 Conference Workshops2013Ingår i: The AI Magazine, ISSN 0738-4602, Vol. 34, nr 4, s. 108-115Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The AAAI-13 Workshop Program, a part of the 27th AAAI Conference on Artificial Intelligence, was held Sunday and Monday, July 14-15, 2013, at the Hyatt Regency Bellevue Hotel in Bellevue, Washington, USA. The program included 12 workshops covering a wide range of topics in artificial intelligence, including Activity Context-Aware System Architectures (WS-13-05); Artificial Intelligence and Robotics Methods in Computational Biology (WS-13-06); Combining Constraint Solving with Mining and Learning (WS-13-07); Computer Poker and Imperfect Information (WS-13-08); Expanding the Boundaries of Health Informatics Using Artificial Intelligence (WS-13-09); Intelligent Robotic Systems (WS-13-10); Intelligent Techniques for Web Personalization and Recommendation (WS-13-11); Learning Rich Representations from Low-Level Sensors (WS-13-12); Plan, Activity,, and Intent Recognition (WS-13-13); Space, Time, and Ambient Intelligence (WS-13-14); Trading Agent Design and Analysis (WS-13-15); and Statistical Relational Artificial Intelligence (WS-13-16)

  • 560.
    Agreste, Santa
    et al.
    Department of Mathematics and Computer Science, Physical Sciences and Earth Sciences, University of Messina.
    De Meo, Pasquale
    of Ancient and Modern Civilizations, University of Messina.
    Fiumara, Giacomo
    Department of Mathematics and Computer Science, Physical Sciences and Earth Sciences, University of Messina.
    Piccione, Giuseppe
    Department of Mathematics and Computer Science, Physical Sciences and Earth Sciences, University of Messina.
    Piccolo, Sebastiano
    Department of Management Engineering - Engineering Systems Division at the Technical University of Denmark.
    Rosaci, Domenico
    DIIES Department, University of Reggio Calabria Via Graziella.
    Sarné, Giuseppe M. L.
    DICEAM Department, University of Reggio Calabria Via Graziella.
    Vasilakos, Athanasios
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    An empirical comparison of algorithms to find communities in directed graphs and their application in Web Data Analytics2017Ingår i: IEEE Transactions on Big Data, E-ISSN 2332-7790, Vol. 3, nr 3, s. 289-306Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Detecting communities in graphs is a fundamental tool to understand the structure of Web-based systems and predict their evolution. Many community detection algorithms are designed to process undirected graphs (i.e., graphs with bidirectional edges) but many graphs on the Web - e.g. microblogging Web sites, trust networks or the Web graph itself - are often directed. Few community detection algorithms deal with directed graphs but we lack their experimental comparison. In this paper we evaluated some community detection algorithms across accuracy and scalability. A first group of algorithms (Label Propagation and Infomap) are explicitly designed to manage directed graphs while a second group (e.g., WalkTrap) simply ignores edge directionality; finally, a third group of algorithms (e.g., Eigenvector) maps input graphs onto undirected ones and extracts communities from the symmetrized version of the input graph. We ran our tests on both artificial and real graphs and, on artificial graphs, WalkTrap achieved the highest accuracy, closely followed by other algorithms; Label Propagation has outstanding performance in scalability on both artificial and real graphs. The Infomap algorithm showcased the best trade-off between accuracy and computational performance and, therefore, it has to be considered as a promising tool for Web Data Analytics purposes.

  • 561. Agugiaro, G.
    et al.
    Remondino, F.
    Girardi, G.
    von Schwerin, J.
    Richards-Rissetto, Heather
    Umeå universitet, Humanistiska fakulteten, Humlab.
    De Amicis, R.
    A web-based interactive tool for multi-resolution 3d models of a maya archaeological site2011Ingår i: 4TH ISPRS INTERNATIONAL WORKSHOP 3D-ARCH 2011: 3D VIRTUAL RECONSTRUCTION AND VISUALIZATION OF COMPLEX ARCHITECTURES / [ed] Remondino, F; ElHakim, S, 2011, nr W16, s. 23-30Konferensbidrag (Refereegranskat)
    Abstract [en]

    Continuous technological advances in surveying, computing and digital-content delivery are strongly contributing to a change in the way Cultural Heritage is "perceived": new tools and methodologies for documentation, reconstruction and research are being created to assist not only scholars, but also to reach more potential users (e.g. students and tourists) willing to access more detailed information about art history and archaeology. 3D computer-simulated models, sometimes set in virtual landscapes, offer for example the chance to explore possible hypothetical reconstructions, while on-line GIS resources can help interactive analyses of relationships and change over space and time. While for some research purposes a traditional 2D approach may suffice, this is not the case for more complex analyses concerning spatial and temporal features of architecture, like for example the relationship of architecture and landscape, visibility studies etc. The project aims therefore at creating a tool, called "QueryArch3D" tool, which enables the web-based visualisation and queries of an interactive, multi-resolution 3D model in the framework of Cultural Heritage. More specifically, a complete Maya archaeological site, located in Copan (Honduras), has been chosen as case study to test and demonstrate the platform's capabilities. Much of the site has been surveyed and modelled at different levels of detail (LoD) and the geometric model has been semantically segmented and integrated with attribute data gathered from several external data sources. The paper describes the characteristics of the research work, along with its implementation issues and the initial results of the developed prototype. [GRAPHICS] .

  • 562.
    Aguilar, Xavier
    et al.
    KTH, Skolan för datavetenskap och kommunikation (CSC), High Performance Computing and Visualization (HPCViz).
    Fuerlinger, Karl
    Laure, Erwin
    KTH, Skolan för datavetenskap och kommunikation (CSC), High Performance Computing and Visualization (HPCViz).
    Automatic On-Line Detection of MPI Application Structure with Event Flow Graphs2015Ingår i: EURO-PAR 2015: PARALLEL PROCESSING, Springer Berlin/Heidelberg, 2015, s. 70-81Konferensbidrag (Refereegranskat)
    Abstract [en]

    The deployment of larger and larger HPC systems challenges the scalability of both applications and analysis tools. Performance analysis toolsets provide users with means to spot bottlenecks in their applications by either collecting aggregated statistics or generating loss-less time-stamped traces. While obtaining detailed trace information is the best method to examine the behavior of an application in detail, it is infeasible at extreme scales due to the huge volume of data generated. In this context, knowing the application structure, and particularly the nesting of loops in iterative applications is of great importance as it allows, among other things, to reduce the amount of data collected by focusing on important sections of the code. In this paper we demonstrate how the loop nesting structure of an MPI application can be extracted on-line from its event flow graph without the need of any explicit source code instrumentation. We show how this knowledge on the application structure can be used to compute postmortem statistics as well as to reduce the amount of redundant data collected. To that end, we present a usage scenario where this structure information is utilized on-line (while the application runs) to intelligently collect fine-grained data for only a few iterations of an application, considerably reducing the amount of data gathered.

  • 563.
    Aguilar, Xavier
    et al.
    KTH, Skolan för datavetenskap och kommunikation (CSC), Centra, Parallelldatorcentrum, PDC.
    Schliephake, Michael
    KTH, Skolan för datavetenskap och kommunikation (CSC), Centra, Parallelldatorcentrum, PDC.
    Vahtras, Olav
    KTH, Skolan för bioteknologi (BIO), Teoretisk kemi och biologi. KTH, Skolan för datavetenskap och kommunikation (CSC), Centra, Parallelldatorcentrum, PDC.
    Gimenez, Judit
    Barcelona Supercomputing Center, Universitat Politecnica de Catalunya, Barcelona, Spain.
    Laure, Erwin
    KTH, Skolan för datavetenskap och kommunikation (CSC), Centra, Parallelldatorcentrum, PDC.
    Scaling Dalton, a molecular electronic structure program2011Ingår i: Seventh International Conference on e-Science, e-Science 2011, 5-8 December 2011, Stockholm, Sweden, IEEE conference proceedings, 2011, s. 256-262Konferensbidrag (Refereegranskat)
    Abstract [en]

    Dalton is a molecular electronic structure program featuring common methods of computational chemistry that are based on pure quantum mechanics (QM) as well as hybrid quantum mechanics/molecular mechanics (QM/MM). It is specialized and has a leading position in calculation of molecular properties with a large world-wide user community (over 2000 licenses issued). In this paper, we present a characterization and performance optimization of Dalton that increases the scalability and parallel efficiency of the application. We also propose asolution that helps to avoid the master/worker design of Daltonto become a performance bottleneck for larger process numbers and increase the parallel efficiency.

  • 564.
    Aguirre Quiroz, Gerardo Daniel
    KTH, Skolan för informations- och kommunikationsteknik (ICT).
    Evaluation of the potential benefits of using Licensed Shared Access in the Americas2014Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Internet har blivit en allmänt förekommande service och mänskliga behov. Mobilnät har kämpat med "Mobile Data Tsunami", en ökning av mobilt konsumtions bredband på grund av snabbare nät, kraftfulla enheter och fler trafik-krävande applikationer, samt en högre penetration volym. Enligt Cisco mobil datatrafik förväntas växa till 15,9 exabyte per månad år 2018, är att nästan elva gånger den mobila datatrafiken 2013.

    Spektrum är en nyckelfaktor för nätutbyggnad, eftersom det avgör kapaciteten i nätet. Ändå är spektrum en begränsad naturresurs, dvs en ändlig, icke-ändliga gemensam resurs. För att uppfylla de höga resultatmål för framtida mobilt bredband (MBB) system, en effektivare användning och effektivare hantering av spektrumresurser måste utvecklas.

    Licensierad Shared Access är en ny kompletterande tillgång spektrum system som gör det möjligt att dela med sig av delvis använda licensierat spektrum från en befintlig (t.ex. en statlig organisation), med ett begränsat antal "LSA licenstagare" (t.ex. Mobile Network Operators). LSA Avtalet följer fördefinierade dynamiska eller statiska delningsvillkor, som bestämmer var, när och hur man använder den dominerande operatörens spektrumet.

    Genomförandet av Licensed delat tillträde behöver stöd från en mycket bra regelverk och följer den harmoniserade vägen spektrumet. Spectral harmonisering, eller en enhetlig fördelning av frekvensband över hela regionen sänker teknikkostnader, vilket gör det lättare för något land att överväga dess genomförande. En gång är anpassad efter hela regioner, är skalfördelar uppnås.

    Några första steg mot en ny ram baserad på LSA har fått i Europa och Nordamerika, men att betrakta LSA som ett verkligt alternativ, krävs en fullständig analys med tanke på fler marknader. Det är viktigt att fundera på hur andra regioner runt om i världen kan påverkas av denna nya metod för att se om LSA är en möjlig lösning eller inte.

    Ansatsen i denna forskning omfattar samspelet mellan tekniska, marknadsmässiga och rättsliga villkoren i Amerika för att presentera det möjliga värdet av LSA. Den första delen av studien behandlar analysen av de tekniska aspekterna av LSA. Följande delar behandlar vilka villkor utvärderingen görs. Först behandlar studien med de marknadsförhållanden som finns i Amerika som helhet, för att sedan ta itu med en mer specifik undersökning av marknaden och regler i utvalda länder iregionen.

    Forskningen visade hur det finns flera sätt LSA kan ge positivt värde till etablerade och nya aktörer i Amerika, speciellt i högtrafikerade områden, och / eller inomhusmiljöer. Men trots fördelarna med LSA, är tidpunkten inte där ännu. Regionen har fortfarande gott om spektrum att fördelas exklusiv spektrum, som föredras av operatörerna. Den låg mobilpenetration bredband i större delen av regionen är också en faktor för det låga värdet av LSA i tiden för denna studie.

  • 565.
    Aguiño, Gonzalo Iglesias
    Karlstads universitet, Fakulteten för ekonomi, kommunikation och IT.
    Performance of VoIP strategies for hybrid Mobile Ad Hoc Networks2007Självständigt arbete på avancerad nivå (magisterexamen), 20 poäng / 30 hpStudentuppsats
    Abstract [en]

    Last decade, a lot of research has been done in wireless communication technologies. Mobile

    nodes such personal digital assistants (PDAs), notebooks and cell phones are nowadays used

    in human’s daily life.

    MANETs are networks consisting of two or more mobile nodes equipped with wireless

    communication and networking capabilities, but they don’t have any network centrilized

    infrastructure.

    In last few years, MANETs have been emerged to be an important researched subject in the

    field of wireless networking.

    MANETs are autonomous; however they can communicate with other external networks such

    the internet. They are linked to such external networks by mobile nodes acting as gateways.

    This kind of networks is known as hybrid MANETs.

    Voice over Internet Protocol (VoIP), is a technology that allows you to make voice calls using

    a Internet connection instead of a regular (or analog) phone line.

    The goal of this thesis is evaluate the performance of VoIP strategies for hybrid MANETs.

    Two different aspects are evaluated, the session establishment performance and the voice

    quality.

    Network Simulator 2 is used to run several simulations, two different applications are used to

    run voice simulations (Session Initiation Protocol and Exponential traffic generator). We

    evaluate two different cases for voice traffics, voice calls between two MANET nodes and

    voice calls between MANET nodes and external nodes.

    After running the simulations, there are some performance parameters which will reveal the

    results. The key findings of the simulations are: adding gateways, number of voice traffic

    flows and the number of hops between source and destinations. There are some interesting

    results which reveal for example, that adding gateways is not always beneficial.

  • 566.
    Agushi, Camrie
    Blekinge Tekniska Högskola, Sektionen för teknik, Avdelningen för programvarusystem.
    Innovation inom Digital Rights Management2005Självständigt arbete på avancerad nivå (magisterexamen)Studentuppsats (Examensarbete)
    Abstract [sv]

    Uppsatsen behandlar ämnet Digital Rights Management (DRM), mer specifikt innovationstrenderna inom DRM. Fokus är på tre drivkrafter i DRM. För det första, DRM teknologier, för det andra, DRM standarder, och för det tredje, DRM interoperabilitet. Dessa drivkrafter diskuteras och analyseras för att kunna utforska innovationstrenderna inom DRM. Avslutningsvis formas en multifacetterad översikt av dagens DRM-kontext. En slutsats är att aspekten av Intellectual Property Rights anses vara en viktig indikator av den riktning som DRM innovationen går mot.

  • 567. Agustí, Ramón
    et al.
    Fazekas, Péter
    Gómez Barquero, David
    Lindskog, Stefan
    Karlstads universitet, Fakulteten för ekonomi, kommunikation och IT, Avdelningen för datavetenskap. Karlstads universitet, Fakulteten för ekonomi, kommunikation och IT, Centrum för HumanIT.
    Oliver, Miquel
    Pérez-Romero, Jordi
    Tralli, Velio
    NEWCOM DR7.2: First report on common framework/models and activities in Department 72005Rapport (Refereegranskat)
    Abstract [en]

    This deliverable provides a description of the framework identified for the collaborative activities between different partners in the context of NEWCOM department 7 on QoS provision in heterogeneous wireless networks. The considered models, assumptions and expected results are pointed out for each activity. The deliverable also includes a report on the means to achieve the integration between the different partners

  • 568. Agustí, Ramón
    et al.
    Fazekas, Péter
    Lindskog, Stefan
    Karlstads universitet, Fakulteten för ekonomi, kommunikation och IT, Avdelningen för datavetenskap. Karlstads universitet, Fakulteten för ekonomi, kommunikation och IT, Centrum för HumanIT.
    Oliver, Miquel
    Pérez-Romero, Jordi
    Studer Ferreira, Lucio
    Tralli, Velio
    NEWCOM DR7.4: Final Report on the activities carried out in Department 72007Rapport (Refereegranskat)
    Abstract [en]

    This deliverable constitutes the final report of all the activities that carried out in the framework of the NEWCOM department 7. It contains a description of the main technical achievements for each one of the activities in which the department has been organised togehter with the list of indicators reflecting the degree of integration that has been achieved among the different partners

  • 569.
    Agyemang, Frank
    et al.
    Högskolan i Jönköping, Internationella Handelshögskolan, IHH, Informatik.
    Asante Ofori, Kingsley
    Högskolan i Jönköping, Internationella Handelshögskolan, IHH, Informatik.
    Ofori, Sunday Jonathan
    Högskolan i Jönköping, Internationella Handelshögskolan, IHH, Informatik.
    Promise and Performance of ERP (perspective of implementers)2006Självständigt arbete på avancerad nivå (magisterexamen), 10 poäng / 15 hpStudentuppsats
  • 570.
    Agélii Genlott, Annika
    et al.
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Grönlund, Åke
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Closing the gaps: Improving literacy and mathematics by ict-enhanced collaboration2016Ingår i: Computers and education, ISSN 0360-1315, E-ISSN 1873-782X, Vol. 99, s. 68-80Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Literacy and mathematics are necessary skills that for different reasons unfortunately not everybody acquires sufficiently. In OECD countries there is also a gender gap; boys lag behind girls in literacy but often outperform girls in mathematics (OECD, 2012). ICT (Information and communication technologies) may contribute useful tools to address both these problems but in order to effectively create better educational conditions there is yet a need to develop effective methods that combine ICT with key factors for learning. This research contributes to this by measuring effects of the “Write to Learn” (WTL) method. WTL lets children from 1st grade use several ICT tools to write texts and subsequently discuss and refine them together with classmates and teachers using digital real-time formative feedback and assessment. The central learning factor addressed, in mathematics as well as in literacy, is the written communication allowing the learners to interact with peers and teachers. WTL draws on methods from socio-cultural theory, including continuous social interaction and written real-time formative feedback among peers, using shared electronic forums for collaboration, thereby providing social meaning and increased learning of literacy and mathematics, among both boys and girls.

    The study uses quantitative methods and two control groups, one using traditional method (no ICT) and one using technology individually (without integrated social interaction and formative feedback), to compare results from 502 students in grade 3 national tests in mathematics and literacy. WTL yields by far best results; higher average score both in literacy and mathematics, smaller gender gap, and significantly better results for the under-achievers. The ITU method performs worst, which shows that ICT use must be well integrated into the pedagogy to be useful.

  • 571. Agüero, Juan C.
    et al.
    Godoy, Boris I.
    Goodwin, Graham C.
    Wigren, Torbjörn
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Matematisk-datavetenskapliga sektionen, Institutionen för informationsteknologi, Avdelningen för systemteknik. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Matematisk-datavetenskapliga sektionen, Institutionen för informationsteknologi, Reglerteknik.
    Scenario-based EM identification for FIR systems having quantized output data2009Ingår i: Proc. 15th IFAC Symposium on System Identification, International Federation of Automatic Control , 2009, s. 66-71Konferensbidrag (Refereegranskat)
  • 572.
    Agüero, Ramón
    et al.
    University of Cantabria, Spain.
    Berg, Miguel
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS.
    Choque, Johnny
    University of Cantabria, Spain.
    Hultell, Johan
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS.
    Jennen, Ralf
    RWTH Aachen University, Germany.
    Markendahl, Jan
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, KTH Center för Trådlösa System, Wireless@kth.
    Muñoz, Luis
    University of Cantabria, Spain.
    Prytz, Mikael
    Ericsson Research.
    Strandberg, Ove
    Nokia, Finland.
    RRM Challenges for Non-Conventional and Low-Cost Networks in Ambient Networks2005Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper presents an overview of the Radio Resource Management (RRM) functionalities needed for Non-Conventional and Low-Cost Networks. These types of networks are characterized by increased cooperation between different types of networks and providers and they are believed to play a fundamental role for future wireless network networking. The paper describes three specific concepts, which latter is used to identify new RRM challenges. In addition, it identifies the relation between the RRM challenges and the Ambient Networks architecture and functionalities, in particular the multiradio resource management functionality.

  • 573.
    Ahammed, Farhan
    et al.
    The University of Sydney, Australia.
    Taheri, Javid
    The University of Sydney, Australia.
    Zomaya, Albert
    The University of Sydney, Sydney, Australia.
    Finding lower bounds of localization with noisy measurements using genetic algorithms2011Ingår i: Proceedings of the first ACM international symposium on Design and analysis of intelligent vehicular networks and applications (DIVANet '11), Miami, Florida, USA: Association for Computing Machinery (ACM), 2011, s. 47-54Konferensbidrag (Refereegranskat)
    Abstract [en]

    Vehicular Ad-Hoc Networks (VANETs) are wireless networks with mobile nodes (vehicles) which connect in an ad-hoc manner. Many vehicles use the Global Positioning System (GPS) to provide their locations. However the inaccuracy of GPS devices leads to some vehicles incorrectly assuming they are located at different positions and sometimes on different roads. VANETs can be used to increase the accuracy of each vehicle's computed location by allowing vehicles to share information regarding the measured distances to neighbouring vehicles. This paper looks at finding how much improvement can be made given the erroneous measurements present in the system. An evolutionary algorithm is used to evolve instances of parameters used by the VLOCI2 algorithm, also presented in this paper, to find instances which minimises the inaccuracy in computed locations. Simulation results show a definite improvement in location accuracy and lower bounds on how much improvement is possible is inferred.

  • 574. Ahammed, Farhan
    et al.
    Taheri, Javid
    The University of Sydney, Australia.
    Zomaya, Albert
    The University of Sydney, Sydney, Australia.
    Finding Lower Bounds of Localization with Noisy Measurements Using Genetic Algorithms2011Rapport (Refereegranskat)
  • 575.
    Ahammed, Farhan
    et al.
    The University of Sydney, Sydney, Australia.
    Taheri, Javid
    The University of Sydney, Australia.
    Zomaya, Albert
    The University of Sydney, Sydney, Australia.
    Using simulated annealing to find lower bounds of localization with noisy measurements2012Ingår i: 2012 IEEE 26th International Parallel and Distributed Processing Symposium Workshops & PhD Forum (IPDPSW), IEEE conference proceedings, 2012, s. 601-608Konferensbidrag (Refereegranskat)
  • 576.
    Ahammed, Farhan
    et al.
    The University of Sydney, Australia.
    Taheri, Javid
    The University of Sydney, Australia.
    Zomaya, Albert
    The University of Sydney, Sydney, Australia.
    Ott, Max
    NICTA Australia Australian Technology Park.
    LICA: Improving Localization Given Noisy Data In GPS-Equipped VANETs Using Trilateration With Cluster Analysis2011Rapport (Refereegranskat)
  • 577.
    Ahammed, Farhan
    et al.
    University of Sydney.
    Taheri, Javid
    The University of Sydney, Australia.
    Zomaya, Albert
    The University of Sydney, Sydney, Australia.
    Ott, Max
    NICTA.
    VLOCI: Using Distance Measurements to Improve the Accuracy of Location Coordinates in GPS-Equipped VANETs2012Ingår i: Mobile and Ubiquitous Systems: 7th International ICST Conference, MobiQuitous 2010, Sydney, Australia, December 6-9, 2010, Revised Selected Papers / [ed] Patrick Sénac, Max Ott, Aruna Seneviratne, Springer Berlin/Heidelberg, 2012, Vol. 73, s. 149-161Konferensbidrag (Refereegranskat)
  • 578.
    Ahammed, Farhan
    et al.
    The University of Sydney, Australia.
    Taheri, Javid
    The University of Sydney, Australia.
    Zomaya, Albert
    The University of Sydney, Sydney, Australia.
    Ott, Max
    NICTA Australia Australian Technology Park.
    VLOCI2: An Iterative Method To Improve Location Coordinates In GPS-Equipped VANETs in Multiple Lanes2011Rapport (Refereegranskat)
  • 579.
    Ahammed, Farhan
    et al.
    The University of Sydney, Australia.
    Taheri, Javid
    The University of Sydney, Australia.
    Zomaya, Albert
    The University of Sydney, Sydney, Australia.
    Ott, Max
    Australian Technology Park, Australia.
    VLOCI2: An Iterative Method To Improve Location Coordinates In GPS-Equipped VANETs in Multiple Lanes2011Rapport (Refereegranskat)
  • 580.
    Ahl, Alexander
    Högskolan i Skövde, Institutionen för kommunikation och information.
    Kreditbedömningar och Data Warehouse: En studie om riktlinjer för insamling, transformering och inladdning av kreditbedömningsinformation i Data Warehouse2013Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Studien har handlat om att ta fram riktlinjer för hur extrahering, transformering och inladdning (ETL) av kreditbedömningsinformation bör göras när det kommer till att införa ett Data Warehouse (DW). Ett kvalitativt angreppssätt har använts med både en fallstudie och en intervjustudie, där fallstudien genomfördes med Asitis AB som är en systemleverantör förfinans- och reskontrafinansiering (factoring) för att undersöka potentiella affärsmöjligheter med ett DW med kreditbedömningsinformation. Intervjustudien användes för att samla in värdefull information från individer inom alla berörda problemområden, och användes sedan i fallstudien. Resultatet var både framgångsfaktorer och fallgropar för ETL-processen med kreditbedömningsinformation som kan fungera som stöd för organisationer med detta behov. Det har visat sig att ETL-processen för kreditbedömningsinformation utgör ett område med stor potential för affärsmöjligheter, där det krävs hög kompetens, domänkunskap, proaktivitet och juridisk kunskap vid genomförande av ETL-processen.

  • 581.
    Ahl, Elin
    et al.
    Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013).
    Nordberg, Nina
    Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013).
    Planning a digital transformation for a company with a process layout: A study conducted at voestalpine Precision Strip AB2018Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Digitalisering är en uppgående trend som delar upp dagens tillverkningsindustri. Medan ett ökande antal företag väljer att implementera digitalisering som en affärsstrategi, så kämpar fortfarande andra företag med att implementera digitalisering i sin verksamhet.

    Tidigare forskning har utvecklat digitala transformationsmodeller, men de har ansetts för allmänna. Denna uppsats använder den mest omfattande digitala transformationsmodellen som bas med syfte att göra den praktiskt användbar för ett tillverkande företag med en funktionell verkstadslayout. För att möjliggöra detta genomfördes en fallstudie på ett stålföretag med denna fabriksdesign. Uppsatsen genomfördes med ett induktivt tillvägagångssätt där primärdata samlades in genom en pilotstudie och halvstrukturerade intervjuer, och sekundärdata samlades in genom en litteraturstudie.

    Under studien framkom det att ett företag skulle ha nytta av en anpassad vägledning för hur digitalisering ska implementeras för att optimalt utnyttja digitala möjligheter. Denna studie bidrog med ytterligare steg och utökningar av den tidigare transformationsmodellen. Studiens bidrag involverar kompetenssäkring, identifierade digitaliseringstrender relaterade till en SWOTanalys, fenomen att ta hänsyn till gällande framtida scenarion, frågor att överväga vid analys av de påverkade områdena, skapande av en digital affärsstrategi, en jämförelse av påverkade områden med tidigare genomförda projekt, åtgärder för att fylla gapet mellan företagets nuvarande tillstånd och mål och kriterier för hur man prioriterar dessa åtgärder. Denna studie utökar aktuell forskning med detaljer och djup gällande en digital transformationsmodell, och gör den därav mer praktisk. I framtida forskning bör en fallstudie som testar potentialen hos transformationsmodellen på ett liknande företag genomföras, och därigenom förbättra modellen ytterligare.

  • 582.
    Ahl, Lars
    Högskolan i Skövde, Institutionen för datavetenskap.
    Intranät på Volvo: riktlinjer för informationsstruktur1998Självständigt arbete på grundnivå (kandidatexamen)Studentuppsats
    Abstract [sv]

    Detta arbete har haft som målsättning att belysa och behandla möjligheter och problem vid utformande av informationsstrukturer i intranätsammanhang. Arbetet har genomförts i samarbete med Volvo Lastvagnar Komponenter i Skövde. En fallstudie har gjorts där Volvos intranät utvärderats. Dessutom har ett experiment genomförts där samband mellan katalog- och länkstruktur klargjorts. Undersökningens syfte är att uppnå en länkstruktur som tillåter användarna att utföra sitt arbete effektivt och att uppnå en katalogstruktur som inte är förändringsbenägen. Den insamlade informationen kan härledas från litteraturstudier, ett experiment, en webb-enkät och intervjuer. De slutsatser som dragits visar i stort på att katalogstrukturen i möjligaste mån bör kategoriseras utifrån informationsinnehåll och att flera länkstrukturer kan skapas och kategoriseras då både utifrån informationsinnehåll och enligt organisationsstruktur. Detta för att administratören inte skall behöva ändra informationsstrukturen när organisationen förändras och att användarna skall erhålla en informationsstruktur där information kan sökas och hämtas genom den länkstruktur som för tillfället är effektivast. I slutet av rapporten diskuteras ämnet allmänt och det framläggs riktlinjer för vad som bör betänkas då en informationsstruktur utformas.

  • 583.
    Ahl, Linda
    Linköpings universitet, Institutionen för datavetenskap.
    Hur fungerar datorer?: En fallstudie av att utveckla pedagogisk multimedia för ett datorhistoriskt museum.2004Självständigt arbete på grundnivå (yrkesexamen)Studentuppsats
    Abstract [sv]

    Få människor vet hur datorer fungerar, vilka komponenter de är uppbyggda av och hur dessa samverkar. I detta examensarbete har en prototyp till en multimediepresentation utvecklats. Presentationen kommer att placeras på ett datorhistoriskt museum och dess syfte kommer där att vara att hjälpa människor förstå hur datorer fungerar. Prototypen är baserad på bilder och enklare animationer som förklarar samverkan och funktion hos de olika datorkomponenterna, bland annat genom att visa scenarier som många människor troligtvis känner igen från sin vardag.

    Målet med arbetet har varit att inskaffa kunskap kring hur multimedia kan användas för att illustrera tekniska processer, samt kunskap kring hur multimediepresentationer skall utveck-las. Därför har en systemutvecklingsmetod tagits fram som är anpassad till denna typ av system och som använts vid utvecklingen av prototypen.

    Systemutvecklingsmetoden är av iterativ modell, eftersom det visat sig att ett iterativt arbetssätt är att föredra framför ett linjärt vid multimedieutveckling. Detta beror på att det i denna typ av arbete där det till en början oftast är oklart vilka krav och önskemål som finns på slutprodukten är svårt att gå enkelriktat genom utvecklingsprocessen, d v s att göra ett steg helt färdigt innan nästa påbörjas.

    När det gäller multimedia är en slutsats att det med fördel kan användas för att visa och förklara tekniska förlopp och att det verkar vara ett användbart hjälpmedel inom utbildning och museiverksamhet.

  • 584.
    Ahl, Veronica
    Högskolan i Skövde, Institutionen för datavetenskap.
    Datakvalitetsverktyg i datalager: Hur hanterar datakvalitetsverktyg datakvalitetsfaktorer?2003Självständigt arbete på grundnivå (kandidatexamen)Studentuppsats
    Abstract [sv]

    I ett företag finns data utspridd i olika datasystem. För att lättare och snabbare komma åt data bör data finnas samlad på ett ställe d.v.s. ett datalager. Om datalagret ska fungera som ett beslutsstöd för företagsledningen är det viktigt att data håller en hög datakvalitetsnivå så att beslut fattas som gynnar företaget. För att kontrollera datakvalitet kan datakvalitetsverktyg användas. Dessa innehåller funktioner för att lösa olika datakvalitetsproblem. I rapporten behandlas hur datakvalitetsfaktorerna korrekthet, datatypsenlighet, konsistens, lämplighet, integration, kompletthet och inga dubbletter hanteras av datakvalitetsverktyg för datalager. En litteraturstudie har genomförts för att se hur datakvalitetsfaktorerna hanteras samt om behandlingen varierar mellan olika datakvalitetslösningar. Litteraturstudien har också använts för att upptäcka om olikheter och likheter i behandlingen av enskilda datakvalitetsfaktorer har påverkat hur väl faktorerna hanteras i lösningarna. Samtliga lösningar i arbetet innehåller datakvalitetsverktyg som beaktar de utvalda datakvalitetsfaktorerna men använder ibland olika tillvägagångssätt. Skillnader finns i hur väl de olika lösningarna hanterar enskilda datakvalitetsfaktorer

  • 585.
    Ahl, Viggo
    Blekinge Tekniska Högskola, Sektionen för teknik, Avdelningen för programvarusystem.
    An experimental comparison of five prioritization methods: Investigating ease of use, accuracy and scalability2005Självständigt arbete på avancerad nivå (magisterexamen)Studentuppsats (Examensarbete)
    Abstract [en]

    Requirements prioritization is an important part of developing the right product in the right time. There are different ideas about which method is the best to use when prioritizing requirements. This thesis takes a closer look at five different methods and then put them into an controlled experiment, in order to find out which of the methods that would be the best method to use. The experiment was designed to find out which method yields the most accurate result, the method’s ability to scale up to many more requirements, what time it took to prioritize with the method, and finally how easy the method was to use. These four criteria combined will indicate which method is more suitable, i.e. be the best method, to use in prioritizing of requirements. The chosen methods are the well-known analytic hierarchy process, the computer algorithm binary search tree, and from the ideas of extreme programming come planning game. The fourth method is an old but well used method, the 100 points method. The last method is a new method, which combines planning game with the analytic hierarchy process. Analysis of the data from the experiment indicates that the planning game combined with analytic hierarchy process could be a good candidate. However, the result from the experiment clearly indicates that the binary search tree yields accurate result, is able to scale up and was the easiest method to use. For these three reasons the binary search tree clearly is the better method to use for prioritizing requirements

  • 586.
    Ahlander, Victoria
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för informatik (IK).
    Jonas, Jensen
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för informatik (IK).
    Utbildning vid systemimplementering: Väsentliga faktorer att ta hänsyn till2015Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Utbildning i samband med systemimplementering är enligt tidigare forskning ett viktigt men åsidosatt ämne som behöver studeras mer i detalj. Den här uppsatsen undersöker vilka faktorer som är väsentliga vid en utbildningssituation i samband med införandet av ett nytt system i en kommunal organisation. Studien belyser faktorer som uppkommit i insamlingen av empiri samt de faktorer som framkommit från tidigare forskning och teoretisk bakgrund. Idag finns det ingen standardiserad modell för hur en användarutbildning bör se ut. Således presenteras de viktigaste faktorerna som ger en indikation på hur en utbildning påverkar implementeringsresultat och hur en bra användarutbildning bör se ut.

  • 587.
    Ahlberg, Ernst
    et al.
    Predictive Compound ADME & Safety, Drug Safety & Metabolism, AstraZeneca IMED Biotech Unit, Mölndal, Sweden.
    Winiwarter, Susanne
    Predictive Compound ADME & Safety, Drug Safety & Metabolism, AstraZeneca IMED Biotech Unit, Mölndal, Sweden.
    Boström, Henrik
    Department of Computer and Systems Sciences, Stockholm University, Sweden.
    Linusson, Henrik
    Department of Information Technology, University of Borås, Sweden.
    Löfström, Tuve
    Högskolan i Jönköping, JTH. Forskningsmiljö Datavetenskap och informatik.
    Norinder, Ulf
    Swetox, Karolinska Institutet, Unit of Toxicology Sciences, Sweden.
    Johansson, Ulf
    Högskolan i Jönköping, JTH, Datateknik och informatik.
    Engkvist, Ola
    External Sciences, Discovery Sciences, AstraZeneca IMED Biotech Unit, Mölndal, Sweden.
    Hammar, Oscar
    Quantitative Biology, Discovery Sciences, AstraZeneca IMED Biotech Unit, Mölndal, Sweden.
    Bendtsen, Claus
    Quantitative Biology, Discovery Sciences, AstraZeneca IMED Biotech Unit, Cambridge, UK.
    Carlsson, Lars
    Quantitative Biology, Discovery Sciences, AstraZeneca IMED Biotech Unit, Mölndal, Sweden.
    Using conformal prediction to prioritize compound synthesis in drug discovery2017Ingår i: Proceedings of Machine Learning Research: Volume 60: Conformal and Probabilistic Prediction and Applications, 13-16 June 2017, Stockholm, Sweden / [ed] Alex Gammerman, Vladimir Vovk, Zhiyuan Luo, and Harris Papadopoulos, 2017, s. 174-184Konferensbidrag (Refereegranskat)
    Abstract [en]

    The choice of how much money and resources to spend to understand certain problems is of high interest in many areas. This work illustrates how computational models can be more tightly coupled with experiments to generate decision data at lower cost without reducing the quality of the decision. Several different strategies are explored to illustrate the trade off between lowering costs and quality in decisions.

    AUC is used as a performance metric and the number of objects that can be learnt from is constrained. Some of the strategies described reach AUC values over 0.9 and outperforms strategies that are more random. The strategies that use conformal predictor p-values show varying results, although some are top performing.

    The application studied is taken from the drug discovery process. In the early stages of this process compounds, that potentially could become marketed drugs, are being routinely tested in experimental assays to understand the distribution and interactions in humans.

  • 588.
    Ahlberg, Ernst
    et al.
    Predictive Compound ADME & Safety, Drug Safety & Metabolism, AstraZeneca IMED Biotech Unit, Mölndal, Sweden.
    Winiwarter, Susanne
    Predictive Compound ADME & Safety, Drug Safety & Metabolism, AstraZeneca IMED Biotech Unit, Mölndal, Sweden.
    Boström, Henrik
    Department of Computer and Systems Sciences, Stockholm University, Sweden.
    Linusson, Henrik
    Department of Information Technology, University of Borås, Sweden.
    Löfström, Tuve
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Datateknik och informatik. Department of Information Technology, University of Borås, Sweden.
    Norinder, Ulf
    Swetox, Karolinska Institutet, Unit of Toxicology Sciences, Sweden.
    Johansson, Ulf
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Datateknik och informatik. Department of Information Technology, University of Borås, Sweden.
    Engkvist, Ola
    External Sciences, Discovery Sciences, AstraZeneca IMED Biotech Unit, Mölndal, Sweden.
    Hammar, Oscar
    Quantitative Biology, Discovery Sciences, AstraZeneca IMED Biotech Unit, Mölndal, Sweden.
    Bendtsen, Claus
    Quantitative Biology, Discovery Sciences, AstraZeneca IMED Biotech Unit, Cambridge, UK.
    Carlsson, Lars
    Quantitative Biology, Discovery Sciences, AstraZeneca IMED Biotech Unit, Mölndal, Sweden.
    Using conformal prediction to prioritize compound synthesis in drug discovery2017Ingår i: Proceedings of Machine Learning Research: Volume 60: Conformal and Probabilistic Prediction and Applications, 13-16 June 2017, Stockholm, Sweden / [ed] Alex Gammerman, Vladimir Vovk, Zhiyuan Luo, and Harris Papadopoulos, Machine Learning Research , 2017, s. 174-184Konferensbidrag (Refereegranskat)
    Abstract [en]

    The choice of how much money and resources to spend to understand certain problems is of high interest in many areas. This work illustrates how computational models can be more tightly coupled with experiments to generate decision data at lower cost without reducing the quality of the decision. Several different strategies are explored to illustrate the trade off between lowering costs and quality in decisions.

    AUC is used as a performance metric and the number of objects that can be learnt from is constrained. Some of the strategies described reach AUC values over 0.9 and outperforms strategies that are more random. The strategies that use conformal predictor p-values show varying results, although some are top performing.

    The application studied is taken from the drug discovery process. In the early stages of this process compounds, that potentially could become marketed drugs, are being routinely tested in experimental assays to understand the distribution and interactions in humans.

  • 589.
    Ahlberg, Gustav
    Linköpings universitet, Institutionen för datavetenskap, Databas och informationsteknik. Linköpings universitet, Tekniska högskolan.
    Generating web applications containing XSS and CSRF vulnerabilities2014Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Most of the people in the industrial world are using several web applications every day. Many of those web applications contain vulnerabilities that can allow attackers to steal sensitive data from the web application's users. One way to detect these vulnerabilities is to have a penetration tester examine the web application. A common way to train penetration testers to find vulnerabilities is to challenge them with realistic web applications that contain vulnerabilities. The penetration tester's assignment is to try to locate and exploit the vulnerabilities in the web application. Training on the same web application twice will not provide any new challenges to the penetration tester, because the penetration tester already knows how to exploit all the vulnerabilities in the web application. Therefore, a vast number of web applications and variants of web applications are needed to train on.

    This thesis describes a tool designed and developed to automatically generate vulnerable web applications. First a web application is prepared, so that the tool can generate a vulnerable version of the web application. The tool injects Cross Site Scripting (XSS) and Cross Site Request Forgery (CSRF) vulnerabilities in prepared web applications. Different variations of the same vulnerability can also be injected, so that different methods are needed to exploit the vulnerability depending on the variation. A purpose of the tool is that it should generate web applications which shall be used to train penetration testers, and some of the vulnerabilities the tool can inject, cannot be detected by current free web application vulnerability scanners, and would thus need to be detected by a penetration tester.

    To inject the vulnerabilities, the tool uses abstract syntax trees and taint analysis to detect where vulnerabilities can be injected in the prepared web applications.

    Tests confirm that web application vulnerability scanners cannot find all the vulnerabilities on the web applications which have been generated by the tool.

  • 590.
    Ahlberg, Jörgen
    et al.
    Linköpings universitet, Institutionen för systemteknik, Datorseende. Linköpings universitet, Tekniska fakulteten.
    Arsic, Dejan
    Munich University of Technology, Germany.
    Ganchev, Todor
    University of Patras, Greece.
    Linderhed, Anna
    FOI Swedish Defence Research Agency.
    Menezes, Paolo
    University of Coimbra, Portugal.
    Ntalampiras, Stavros
    University of Patras, Greece.
    Olma, Tadeusz
    MARAC S.A., Greece.
    Potamitis, Ilyas
    Technological Educational Institute of Crete, Greece.
    Ros, Julien
    Probayes SAS, France.
    Prometheus: Prediction and interpretation of human behaviour based on probabilistic structures and heterogeneous sensors2008Konferensbidrag (Refereegranskat)
    Abstract [en]

    The on-going EU funded project Prometheus (FP7-214901) aims at establishing a general framework which links fundamental sensing tasks to automated cognition processes enabling interpretation and short-term prediction of individual and collective human behaviours in unrestricted environments as well as complex human interactions. To achieve the aforementioned goals, the Prometheus consortium works on the following core scientific and technological objectives:

    1. sensor modeling and information fusion from multiple, heterogeneous perceptual modalities;

    2. modeling, localization, and tracking of multiple people;

    3. modeling, recognition, and short-term prediction of continuous complex human behavior.

  • 591.
    Ahlberg, Jörgen
    et al.
    Linköpings universitet, Institutionen för systemteknik, Informationskodning. Linköpings universitet, Institutionen för systemteknik, Datorseende. Linköpings universitet, Tekniska fakulteten. Termisk Systemteknik AB, Linköping, Sweden.
    Berg, Amanda
    Linköpings universitet, Institutionen för systemteknik, Datorseende. Linköpings universitet, Tekniska fakulteten. Termisk Systemteknik AB, Linköping, Sweden.
    Evaluating Template Rescaling in Short-Term Single-Object Tracking2015Konferensbidrag (Refereegranskat)
    Abstract [en]

    In recent years, short-term single-object tracking has emerged has a popular research topic, as it constitutes the core of more general tracking systems. Many such tracking methods are based on matching a part of the image with a template that is learnt online and represented by, for example, a correlation filter or a distribution field. In order for such a tracker to be able to not only find the position, but also the scale, of the tracked object in the next frame, some kind of scale estimation step is needed. This step is sometimes separate from the position estimation step, but is nevertheless jointly evaluated in de facto benchmarks. However, for practical as well as scientific reasons, the scale estimation step should be evaluated separately – for example,theremightincertainsituationsbeothermethodsmore suitable for the task. In this paper, we describe an evaluation method for scale estimation in template-based short-term single-object tracking, and evaluate two state-of-the-art tracking methods where estimation of scale and position are separable.

  • 592.
    Ahlberg, Jörgen
    et al.
    Swedish Defence Research Agency (FOI), Linköping, Sweden.
    Dornaika, Fadi
    Linköpings universitet, Institutionen för systemteknik, Bildkodning. Linköpings universitet, Tekniska högskolan.
    Efficient active appearance model for real-time head and facial feature tracking2003Ingår i: Analysis and Modeling of Faces and Gestures, 2003. AMFG 2003. IEEE International Workshop on, IEEE conference proceedings, 2003, s. 173-180Konferensbidrag (Refereegranskat)
    Abstract [en]

    We address the 3D tracking of pose and animation of the human face in monocular image sequences using active appearance models. The classical appearance-based tracking suffers from two disadvantages: (i) the estimated out-of-plane motions are not very accurate, and (ii) the convergence of the optimization process to desired minima is not guaranteed. We aim at designing an efficient active appearance model, which is able to cope with the above disadvantages by retaining the strengths of feature-based and featureless tracking methodologies. For each frame, the adaptation is split into two consecutive stages. In the first stage, the 3D head pose is recovered using robust statistics and a measure of consistency with a statistical model of a face texture. In the second stage, the local motion associated with some facial features is recovered using the concept of the active appearance model search. Tracking experiments and method comparison demonstrate the robustness and out-performance of the developed framework.

  • 593.
    Ahlberg, Jörgen
    et al.
    Dept. of IR Systems, Div. of Sensor Technology, Swedish Defence Research Agency (FOI), Linköping, Sweden.
    Dornaika, Fadi
    Computer Vision Center, Universitat Autonoma de Barcelona, Bellaterra, Spain.
    Parametric Face Modeling and Tracking2005Ingår i: Handbook of Face Recognition / [ed] Stan Z. Li, Anil K. Jain, Springer-Verlag New York, 2005, s. 65-87Kapitel i bok, del av antologi (Övrigt vetenskapligt)
  • 594.
    Ahlberg, Jörgen
    et al.
    Linköpings universitet, Institutionen för systemteknik, Bildkodning. Linköpings universitet, Tekniska högskolan. Div. of Sensor Technology, Swedish Defence Research Agency, Linköping, Sweden.
    Forchheimer, Robert
    Linköpings universitet, Institutionen för systemteknik, Bildkodning. Linköpings universitet, Tekniska högskolan.
    Face tracking for model-based coding and face animation2003Ingår i: International journal of imaging systems and technology (Print), ISSN 0899-9457, E-ISSN 1098-1098, Vol. 13, nr 1, s. 8-22Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We present a face and facial feature tracking system able to extract animation parameters describing the motion and articulation of a human face in real-time on consumer hardware. The system is based on a statistical model of face appearance and a search algorithm for adapting the model to an image. Speed and robustness is discussed, and the system evaluated in terms of accuracy.

  • 595.
    Ahlberg, Jörgen
    et al.
    Div. of Sensor Technology, Swedish Defence Research Agency (FOI), Linköping, Sweden.
    Klasén, Lena
    Div. of Sensor Technology, Swedish Defence Research Agency (FOI), Linköping, Sweden.
    Surveillance Systems for Urban Crisis Management2005Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    We present a concept for combing 3D models and multiple heterogeneous sensors into a surveillance system enabling superior situation awareness. The concept has many military as well as civilian applications. A key issue is the use of a 3D environment model of the area to be surveyed, typically an urban area. In addition to the 3D model, the area of interest is monitored over time using multiple heterogeneous sensors, such as optical, acoustic, and/or seismic sensors. Data and analysis results from the sensors are visualized in the 3D model, thus putting them in a common reference frame and making their spatial and temporal relations obvious. The result is highlighted by an example where data from different sensor systems is integrated in a 3D model of a Swedish urban area.

  • 596.
    Ahlberg, Jörgen
    et al.
    Linköpings universitet, Institutionen för systemteknik, Informationskodning. Linköpings universitet, Tekniska högskolan.
    Li, Haibo
    Linköpings universitet, Institutionen för systemteknik, Informationskodning. Linköpings universitet, Tekniska högskolan.
    Representing and Compressing MPEG-4 Facial Animation Parameters using Facial Action Basis Functions1999Ingår i: IEEE Transactions on Circuits and Systems, ISSN 0098-4094, E-ISSN 1558-1276, Vol. 9, nr 3, s. 405-410Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In model-based, or semantic, coding, parameters describing the nonrigid motion of objects, e.g., the mimics of a face, are of crucial interest. The facial animation parameters (FAPs) specified in MPEG-4 compose a very rich set of such parameters, allowing a wide range of facial motion. However, the FAPs are typically correlated and also constrained in their motion due to the physiology of the human face. We seek here to utilize this spatial correlation to achieve efficient compression. As it does not introduce any interframe delay, the method is suitable for interactive applications, e.g., videophone and interactive video, where low delay is a vital issue.

  • 597.
    Ahlberg, Jörgen
    et al.
    Termisk Systemteknik AB Linköping, Sweden; Visage Technologies AB Linköping, Sweden.
    Markuš, Nenad
    Human-Oriented Technologies Laboratory, Faculty of Electrical Engineering and Computing, University of Zagreb, Croatia.
    Berg, Amanda
    Termisk Systemteknik AB, Linköping, Sweden.
    Multi-person fever screening using a thermal and a visual camera2015Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    We propose a system to automatically measure the body temperature of persons as they pass. In contrast to exisitng systems, the persons do not need to stop and look into a camera one-by-one. Instead, their eye corners are automatically detected and the temperatures therein measured using a thermal camera. The system handles multiple simultaneous persons and can thus be used where a flow of people pass, such as at airport gates.

  • 598.
    Ahlberg, Jörgen
    et al.
    Linköpings universitet, Institutionen för systemteknik, Datorseende. Linköpings universitet, Tekniska fakulteten. Glana Sensors AB, Sweden.
    Renhorn, Ingmar
    Glana Sensors AB, Sweden.
    Chevalier, Tomas
    Scienvisic AB, Sweden.
    Rydell, Joakim
    FOI, Swedish Defence Research Agency, Sweden.
    Bergström, David
    FOI, Swedish Defence Research Agency, Sweden.
    Three-dimensional hyperspectral imaging technique2017Ingår i: ALGORITHMS AND TECHNOLOGIES FOR MULTISPECTRAL, HYPERSPECTRAL, AND ULTRASPECTRAL IMAGERY XXIII / [ed] Miguel Velez-Reyes; David W. Messinger, SPIE - International Society for Optical Engineering, 2017, Vol. 10198, artikel-id 1019805Konferensbidrag (Refereegranskat)
    Abstract [en]

    Hyperspectral remote sensing based on unmanned airborne vehicles is a field increasing in importance. The combined functionality of simultaneous hyperspectral and geometric modeling is less developed. A configuration has been developed that enables the reconstruction of the hyperspectral three-dimensional (3D) environment. The hyperspectral camera is based on a linear variable filter and a high frame rate, high resolution camera enabling point-to-point matching and 3D reconstruction. This allows the information to be combined into a single and complete 3D hyperspectral model. In this paper, we describe the camera and illustrate capabilities and difficulties through real-world experiments.

  • 599.
    Ahlberg, Jörgen
    et al.
    Swedish Defence Research Agency (FOI), Linköping, Sweden.
    Renhorn, Ingmar G.
    Swedish Defence Research Agency (FOI), Linköping, Sweden.
    Wadströmer, Niclas
    Swedish Defence Research Agency (FOI), Linköping, Sweden.
    An information measure of sensor performance and its relation to the ROC curve2010Ingår i: Proc. SPIE 7695, Algorithms and Technologies for Multispectral, Hyperspectral, and Ultraspectral Imagery XVI / [ed] Sylvia S. Shen; Paul E. Lewis, SPIE - International Society for Optical Engineering, 2010, s. Art.nr. 7695-72-Konferensbidrag (Refereegranskat)
    Abstract [en]

    The ROC curve is the most frequently used performance measure for detection methods and the underlying sensor configuration. Common problems are that the ROC curve does not present a single number that can be compared to other systems and that no discrimination between sensor performance and algorithm performance is done. To address the first problem, a number of measures are used in practice, like detection rate at a specific false alarm rate, or area-under-curve. For the second problem, we proposed in a previous paper1 an information theoretic method for measuring sensor performance. We now relate the method to the ROC curve, show that it is equivalent to selecting a certain point on the ROC curve, and that this point is easily determined. Our scope is hyperspectral data, studying discrimination between single pixels.

  • 600.
    Ahlberg, Michael
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Elektronik- och datorsystem, ECS.
    Vlassov, Vladimir
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Elektronik- och datorsystem, ECS.
    Yasui, Terumasa
    Advanced Technology Research and Development Center, Mitsubishi Electric Corporation, Amagasaki, Japan.
    Router placement in wireless sensor networks2006Ingår i: 2006 IEEE International Conference on Mobile Adhoc and Sensor Systems, Vols 1 and 2, IEEE , 2006, s. 498-501Konferensbidrag (Refereegranskat)
    Abstract [en]

    In this paper we propose and evaluate algorithms for placement of routers in a wireless sensor network. There are two major requirements on router placement First, a placement must guarantee connectivity, i.e. every sensor must be able to communicate through routers with a predefined computer-connected gateway node. Second, a placement must provide robust communication in the case of router failures. This is achieved by placing redundant routers that increase the number of possible routes. Both requirements should be met by placing as few routers as possible. The proposed algorithms compute placement in an efficient and reasonably fast way.

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