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  • 201. Aiki, T.
    et al.
    Muntean, Adrian
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science.
    Existence and uniqueness of solutions to a mathematical model predicting service life of concrete structures2009In: Advances in Mathematical Sciences and Applications, ISSN 1343-4373, Vol. 19, p. 119-129Article in journal (Refereed)
  • 202.
    Aiki, Toyohiko
    et al.
    Gifu University, Japan.
    Anthonissen, Martijn
    Eindhoven University Technology, Netherlands.
    Muntean, Adrian
    Eindhoven University Technology, Netherlands.
    On a one-dimensional shape-memory alloy model in its fast-temperature- activation limit2012In: Discrete and Continuous Dynamical Systems. Series S, ISSN 1937-1632, E-ISSN 1937-1179, Vol. 5, no 1, p. 15-28Article in journal (Refereed)
  • 203.
    Aiki, Toyohiko
    et al.
    Gifu University, Japan.
    Muntean, Adrian
    Eindhoven University of Technology.
    Large time behavior of solutions to a moving-interface problem modeling concrete carbonation2010In: Communications on Pure and Applied Analysis, ISSN 1534-0392, E-ISSN 1553-5258, Vol. 9, no 5, p. 1117-1129Article in journal (Refereed)
  • 204.
    Aiki, Toyohiko
    et al.
    Tokyo Womens University.
    Muntean, Adrian
    Netherlands.
    Large-time asymptotics of moving-reaction interfaces involving nonlinear Henry’s law and time-dependent Dirichlet data2013In: Nonlinear Analysis, ISSN 0362-546X, E-ISSN 1873-5215, Vol. 93, p. 3-14Article in journal (Refereed)
    Abstract [en]

    We study the large-time behavior of the free boundary position capturing the one-dimensional motion of the carbonation reaction front in concrete-based materials. We extend here our rigorous justification of the t-behavior of reaction penetration depths by including nonlinear effects due to deviations from the classical Henry's law and time-dependent Dirichlet data.

  • 205. Aiki, Toyohiko
    et al.
    Muntean, Adrian
    Eindhoven University of Technology.
    Large-time behavior of a two-scale semilinear reaction-diffusion system for concrete sulfatation2014In: Mathematical methods in the applied sciences, ISSN 0170-4214, E-ISSN 1099-1476, Vol. 38, no 7, p. 1451-1464Article in journal (Refereed)
  • 206.
    Aiki, Toyohiko
    et al.
    Japan.
    Muntean, Adrian
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science (from 2013).
    Large-time behavior of solutions to a thermo-diffusion system with Smoluchowski interactions2017In: Journal of Differential Equations, ISSN 0022-0396, E-ISSN 1090-2732, Vol. 5, no 5, p. 3009-3026Article in journal (Refereed)
    Abstract [en]

    We prove the large time behavior of solutions to a coupled thermo-diffusion arising in the modeling of the motion of hot colloidal particles in porous media. Additionally, we also ensure the uniqueness of solutions of the target problem. The main mathematical difficulty is due to the presence in the right-hand side of the equations of products between temperature and concentration gradients. Such terms mimic the so-called thermodynamic Soret and Dufour effects. These are cross-coupling terms emphasizing in this context a strong interplay between heat conduction and molecular diffusion.

  • 207.
    Aiki, Toyohiko
    et al.
    Gifu University, Japan.
    Muntean, Adrian
    Eindhoven University of Technology.
    On uniqueness of a weak solution of one-dimensional concrete carbonation problem2011In: Discrete and Continuous Dynamical Systems, ISSN 1078-0947, E-ISSN 1553-5231, Vol. 29, no 4, p. 1345-1365Article in journal (Refereed)
    Abstract [en]

    In our previous works we studied a one-dimensional free-boundary model related to the aggressive penetration of gaseous carbon dioxide in unsaturated concrete. Essentially, global existence and uniqueness of weak solutions to the model were obtained when the initial functions are bounded on the domain. In this paper we investigate the well-posedness of the problem for the case when the initial functions belong to a  class. Specifically, the uniqueness of weak solutions is proved by applying the dual equation method.

  • 208. Aili, C.
    et al.
    Blossing, Ulf
    Tornberg, U.
    Läraren i blickpunkten: Olika perspektiv på lärare liv och arbete2008Book (Refereed)
  • 209.
    Aitenbichler, Erwin
    et al.
    Technische Universität Darmstadt, Germany.
    Behring, Alexander
    Technische Universität Darmstadt, Germany.
    Bradler, Dirk
    Technische Universität Darmstadt, Germany.
    Hartmann, Melanie
    Technische Universität Darmstadt, Germany.
    Martucci, Leonardo
    Technische Universität Darmstadt, Germany.
    Mühlhäuser, Max
    Technische Universität Darmstadt, Germany.
    Ries, Sebastian
    Technische Universität Darmstadt, Germany.
    Schnelle-Walka, Dirk
    Technische Universität Darmstadt, Germany.
    Schreiber, Daniel
    Technische Universität Darmstadt, Germany.
    Steimle, Jürgen
    Technische Universität Darmstadt, Germany.
    Strufe, Thorsten
    Technische Universität Darmstadt, Germany.
    Shaping the Future Internet2009In: Proceedings of the 3rd International CompanionAble Workshop IoPTS, Brussels, 2. December 2009., The CompanionAble , 2009Conference paper (Refereed)
    Abstract [en]

    The Internet of Things (IoT) and the Internet of Services (IoS) are two well-knownexemplars of the emerging ‘Internet variants’. These variants will be tightlyinterwoven yet specific with respect to the supporting technologies needed. Thepresent paper discusses the five variants identified as essential by the authors: IoT,IoS, Internet-of-Humans, Internet-of-Crowds, and Internet-of-Clouds. For eachvariant, a non-comprehensive set of research challenges is cited and related to thestate of the art and to ongoing projects of the lab.

  • 210.
    Akaka, Melissa A.
    et al.
    Daniels College of BusinessUniversity of Denver.
    Koskela-Huotari, Kaisa
    Karlstad University, Faculty of Arts and Social Sciences (starting 2013), Service Research Center (from 2013). Karlstad University, Faculty of Arts and Social Sciences (starting 2013), Karlstad Business School (from 2013).
    Vargo, Stephen L.
    Shidler College of BusinessUniversity of Hawai’i at Mānoa.
    Further Advancing Service Science with Service-Dominant Logic: Service Ecosystems, Institutions, and their Implications for Innovation2019In: Handbook of Service Science, Volume II / [ed] Maglio, P. P., Kieliszewski, C. A., Spohrer, J. C., Lyons, K., Patricio, L. & Sawatani, Y., New York: Springer, 2019, Volume II, p. 641-659Chapter in book (Refereed)
    Abstract [en]

    Service-dominant (S-D) logic has been recognized as a theoretical foundation for developing a science of service. As the field of service science advances the understanding of value cocreation in service systems, S-D logic continues to evolve as well. Recent updates and consolidation of the foundational premises establish five core axioms of S-D logic and outline a pathway for understanding the role of institutions in value cocreation in general, and innovation in particular. This chapter overviews the evolution of S-D logic and its service ecosystems view, which can contribute to the furthering the development of service science and advancing the study of innovation in service systems. Future research directions are proposed.

  • 211.
    Alaie, Iman
    et al.
    Uppsala universitet.
    Frick, Andreas
    Uppsala universitet.
    Marteinsdottir, Ina
    Linköping University.
    Hartvig, Per
    Copenhagen University.
    Tillfors, Maria
    Örebro universitet.
    Eriksson, Elias
    Gothenburg University.
    Fredrikson, Mats
    Uppsala universitet.
    Furmark, Tomas
    Uppsala universitet.
    Serotonin Synthesis Rate and the Tryptophan Hydroxylase-2 G-703T Polymorphism in Social Anxiety Disorder2014In: Biological Psychiatry, ISSN 0006-3223, E-ISSN 1873-2402, Vol. 75, no 9, p. 357S-357SArticle in journal (Refereed)
  • 212.
    Alam, Moudud
    et al.
    Högskolan Dalarna.
    Carling, Kenneth
    Högskolan Dalarna.
    Nääs, Ola
    Högskolan Dalarna.
    Sommarjobb, arbetslivserfarenhet och framtida arbetsinkomst2015In: Arbetsmarknad & Arbetsliv, ISSN 1400-9692, Vol. 21, no 4, p. 26-40Article in journal (Refereed)
    Abstract [sv]

    De flesta kommuner erbjuder sommarjobb till gymnasieungdomar. Vi har undersökt om denna arbetslivserfarenhet påverkar flickors framtida arbetsinkomster. Vi följde 1 447 flickor i fem till tolv år efter avslutat gymnasium. Flickorna hade under sitt första gymnasieår ansökt och slumpmässigt tilldelats sommarjobb av Falu kommun. Effekten av sommarjobbserfarenheten på arbetsinkomsten var positiv och betydande för dem.

  • 213.
    Alaqra, Ala Sarah
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science (from 2013).
    The Wicked Problem of Privacy: Design Challenge for Crypto-based Solutions2018Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Data privacy has been growing in importance in recent years, especially with the continuous increase of online activity. Researchers study, design, and develop solutions aimed at enhancing users’ data privacy. The wicked problem of data privacy is a continuous challenge that defies straightforward solutions. Since there are many factors involved in data privacy, such as technological, legal, and human aspects, we can only aim at mitigating rather than solving this wicked problem. Our aim was to focus on human aspects for designing usable crypto-based privacy-enhancing solutions.  In this thesis, we followed a user centered design method by using empirical qualitative means for investigating user’s perceptions and opinions of our solutions. Most of our work has focused on redactable signatures in the cloud context within the eHealth use-case. Redactable signatures are  a privacy enhancing scheme allowing to remove parts of a signed document by a specified party for achieving data minimization without invalidating the respective signature.

    We mainly used semi-structures interviews and focus groups in our investigations. Our results yielded key HCI considerations as well as guidelines of different means for supporting the design of future solutions.

  • 214.
    Alaqra, Alaa
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science (from 2013).
    Fischer-Hübner, Simone
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science (from 2013).
    Framner, Erik
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science (from 2013).
    Enhancing Privacy Controls for Patients via a Selective Authentic Electronic Health Record Exchange Service: Qualitative Study of Perspectives by Medical Professionals and Patients2018In: Journal of Medical Internet Research, ISSN 1438-8871, E-ISSN 1438-8871, Vol. 20, no 12, article id e10954Article in journal (Refereed)
    Abstract [en]

    Background: Patients' privacy is regarded as essential for the patient-doctor relationship. One example of a privacy-enhancing technology for user-controlled data minimization on content level is a redactable signature. It enables users to redact personal information from signed documents while preserving the validity of the signature, and thus the authenticity of the document. In this study, we present end users' evaluations of a Cloud-based selective authentic electronic health record (EHR) exchange service (SAE-service) in an electronic health use case. In the use case scenario, patients were given control to redact specified information fields in their EHR, which were signed by their doctors with a redactable signature and transferred to them into a Cloud platform. They can then selectively disclose the remaining information in the EHR, which still bears the valid digital signature, to third parties of their choice. Objective: This study aimed to explore the perceptions, attitudes, and mental models concerning the SAE-service of 2 user roles: signers (medical professionals) and redactors (patients with different technical knowledge) in Germany and Sweden. Another objective was to elicit usability requirements for this service based on the analysis of our investigation. Methods: We chose empirical qualitative methods to address our research objective. Designs of mock-ups for the service were used as part of our user-centered design approach in our studies with test participants from Germany and Sweden. A total of 13 individual walk-throughs or interviews were conducted with medical staff to investigate the EHR signers' perspectives. Moreover, 5 group walk-throughs in focus groups sessions with (N=32) prospective patients with different technical knowledge to investigate redactor's perspective of EHR data redaction control were used. Results: We found that our study participants had correct mental models with regard to the redaction process. Users with some technical models lacked trust in the validity of the doctor's signature on the redacted documents. Main results to be considered are the requirements concerning the accountability of the patients' redactions and the design of redaction templates for guidance and control. Conclusions: For the SAE-service to be means for enhancing patient control and privacy, the diverse usability and trust factors of different user groups should be considered.

  • 215.
    Alaqra, Ala(a)
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science.
    Fischer-Hübner, Simone
    Karlstad University, Division for Information Technology.
    Groß, Thomas
    Newcastle University, Newcastle, UK.
    Lorünser, Thomas
    Austrian Institute of Technology, Vienna, Austria.
    Slamanig, Daniel
    Graz University of Technology, Graz, Austria.
    Signatures for Privacy, Trust and Accountability in the Cloud: Applications and Requirements2015In: Privacy and Identity Management. Time for a Revolution?: 10th IFIP WG 9.2, 9.5, 9.6/11.7, 11.4, 11.6/SIG 9.2.2 International Summer School, Edinburgh, UK, August 16-21, 2015, Revised Selected Papers / [ed] David Aspinall, Jan Camenisch, Marit Hansen, Simone Fischer-Hübner, Charles Raab, Springer Publishing Company, 2015, Vol. 476, p. 79-96Conference paper (Refereed)
    Abstract [en]

    This paper summarises the results of a workshop at the IFIP Summer School 2015 introducing the EU Horizon 2020 project PRISMACLOUD, that is, Privacy and Security Maintaining Services in the Cloud. The contributions of this summary are three-fold. Firstly, it provides an overview to the PRISMACLOUD cryptographic tools and use-case scenarios that were presented as part of this workshop. Secondly, it distills the discussion results of parallel focus groups. Thirdly, it summarises a ``Deep Dive on Crypto'' session that offered technical information on the new tools. Overall, the workshop aimed at outlining application scenarios and eliciting end-user requirements for PRISMACLOUD.

  • 216.
    Alaqra, Alaa
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science.
    Fischer-Hübner, Simone
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science.
    Pettersson, John
    Karlstad University, Faculty of Arts and Social Sciences (starting 2013), Centre for HumanIT.
    Wästlund, Erik
    Karlstad University, Faculty of Arts and Social Sciences (starting 2013), Service Research Center.
    Stakeholders’ Perspectives on Malleable Signatures in a Cloud-based eHealth Scenario2016In: Proceedings of the International Symposium on Human Aspects of Information Security & Assurance, 2016Conference paper (Refereed)
    Abstract [en]

    In this paper, we discuss end user requirements that we elicited for the use of malleable signatures in a Cloud-based eHealth scenario. The concept of a malleable signature, which is a privacy enhancing cryptographic scheme that enables the redaction of personal information from signed documents while preserving the validity of the signature, might be counter- intuitive to end users as its functionality does not correspond to the one of a traditional signature scheme. A qualitative study via a series of semi-structured interviews and focus groups has been conducted to understand stakeholders’ opinions and concerns in regards to the possible applications of malleable signatures in the eHealth area, where a medical record is first digitally signed by a doctor and later redacted by the patient in the cloud. Results from this study yielded user requirements such as the need for suitable metaphors and guidelines, usable templates, and clear redaction policies. 

  • 217.
    Alastair, Henry
    et al.
    Högskolan Väst.
    Sundqvist, Pia
    Karlstad University, Faculty of Arts and Social Sciences (starting 2013), Center for Language and Literature in Education. Karlstad University, Faculty of Arts and Social Sciences (starting 2013), Department of Language, Literature and Intercultural Studies.
    Korp, Helena
    Högskolan Väst.
    Elevers möten med engelska i och utanför skolan : Upprop till deltagande i forskningsprojektet Bridging the Gap2014In: LMS : Lingua, ISSN 0023-6330, no 4, p. 22-26Article in journal (Other (popular science, discussion, etc.))
  • 218.
    Alavian-Ghavanini, Ali
    et al.
    Karolinska Institutet.
    Lin, Ping-I
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Health Sciences (from 2013).
    Lind, P. Monica
    Uppsala University.
    Rimfors, Sabina Risen
    Karolinska Institutet.
    Lejonklou, Margareta Halin
    Uppsala University.
    Dunder, Linda
    Uppsala University.
    Tang, Mandy
    Karolinska Institutet.
    Lindh, Christian
    Lund University.
    Bornehag, Carl-Gustaf
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Health Sciences (from 2013). Icahn School of Medicine Mt Sinai, New York, USA.
    Rueegg, Joelle
    Karolinska Institutet.
    Prenatal Bisphenol A Exposure is Linked to Epigenetic Changes in Glutamate Receptor Subunit Gene Grin2b in Female Rats and Humans2018In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 8, article id 11315Article in journal (Refereed)
    Abstract [en]

    Bisphenol A (BPA) exposure has been linked to neurodevelopmental disorders and to effects on epigenetic regulation, such as DNA methylation, at genes involved in brain function. High doses of BPA have been shown to change expression and regulation of one such gene, Grin2b, in mice. Yet, if such changes occur at relevant doses in animals and humans has not been addressed. We investigated if low-dose developmental BPA exposure affects DNA methylation and expression of Grin2b in brains of adult rats. Furthermore, we assessed associations between prenatal BPA exposure and Grin2b methylation in 7-year old children. We found that Grin2b mRNA expression was increased and DNA methylation decreased in female, but not in male rats. In humans, prenatal BPA exposure was associated with increased methylation levels in girls. Additionally, Iow APGAR scores, a predictor for increased risk for neurodevelopmental diseases, were associated with higher Grin2b methylation levels in girls. Thus, we could link developmental BPA exposure and Iow APGAR scores to changes in the epigenetic regulation of Grin2b, a gene important for neuronal function, in a sexual dimorphic fashion. Discrepancies in exact locations and directions of the DNA methylation change might reflect differences between species, analysed tissues, exposure level and/or timing.

  • 219.
    Alay, Özgü
    et al.
    Simula Research Laboratory, Norway.
    Lutu, Andra
    Simula Research Laboratory, Norway.
    García, Rafael
    IMDEA Networks Institute, Spain.
    Peón Quirós, Miguel
    IMDEA Networks Institute, Spain.
    Mancuso, Vincenzo
    IMDEA Networks Institute, Spain.
    Hirsch, Thomas
    Celerway AS, Norway.
    Dely, Tobias
    Celerway AS, Norway.
    Werme, Jonas
    Celerway AS, Norway.
    Evensen, Kristian
    Celerway AS, Norway.
    Hansen, Audun
    Celerway AS, Norway.
    Alfredsson, Stefan
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science (from 2013).
    Karlsson, Jonas
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science (from 2013).
    Brunström, Anna
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science (from 2013).
    Safari Khatouni, Ali
    Politecnico di Torino.
    Mellia, Marco
    Politecnico di Torino.
    Ajmone Marsan, Marco
    Politecnico di Torino.
    Monno, Roberto
    Nextworks, Italy.
    Lønsethagen, Håkon
    Telenor R&D, Norway.
    MONROE, a distributed platform to measure and assess mobile broadband networks: demo2016In: Proceedings of the Tenth ACM International Workshop on Wireless Network Testbeds, Experimental Evaluation, and Characterization, New York, NY, USA: Association for Computing Machinery (ACM), 2016, p. 85-86Conference paper (Refereed)
    Abstract [en]

    This demo presents the MONROE distributed platform and how it can be used to implement measurement and assessment experiments with operational mobile broadband networks (MBBs). MONROE provides registered experimenters with open access to hundreds of nodes, distributed over several European countries and equipped with multiple MBB connections, and a backend system that collects the measurement results. Experiments are scheduled through a user-friendly web client, with no need to directly access the nodes. The platform further embeds tools for real-time traffic flow analysis and a powerful visualization tool.

  • 220.
    Alay, Özgü
    et al.
    Simula Research Laboratory, Norway.
    Lutu, Andra
    Simula Research Laboratory, Norway.
    Peón-Quirós, Miguel
    IMDEA Networks Institute, Spain.
    Mancuso, Vincenzo
    IMDEA Networks Institute, Spain.
    Hirsch, Thomas
    Celerway Communications, Norway.
    Evensen, Kristian
    Celerway Communications, Norway.
    Hansen, Audun
    Celerway Communications, Norway.
    Alfredsson, Stefan
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science (from 2013).
    Karlsson, Jonas
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science (from 2013).
    Brunström, Anna
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science (from 2013).
    Safari Khatouni, Ali
    Politecnico di Torino, Italy.
    Mellia, Marco
    Politecnico di Torino, Italy.
    Ajmone Marsan, Marco
    IMDEA Networks Institute, Spain and Politecnico di Torino, Italy.
    Experience: An open platform for experimentation with commercial mobile broadband networks2017In: MobiCom '17 Proceedings of the 23rd Annual International Conference on Mobile Computing and Networking, New York: ACM Digital Library, 2017, p. 70-78Conference paper (Refereed)
    Abstract [en]

    Open experimentation with operational Mobile Broadband (MBB) networks in the wild is currently a fundamental requirement of the research community in its endeavor to address the need of innovative solutions for mobile communications. Even more, there is a strong need for objective data about stability and performance of MBB (e.g., 3G/4G) networks, and for tools that rigorously and scientifically assess their status. In this paper, we introduce the MONROE measurement platform: an open access and flexible hardware-based platform for measurements and custom experimentation on operational MBB networks. The MONROE platform enables accurate, realistic and meaningful assessment of the performance and reliability of 11 MBB networks in Europe. We report on our experience designing, implementing and testing the solution we propose for the platform. We detail the challenges we overcame while building and testing the MONROE testbed and argue our design and implementation choices accordingly. We describe and exemplify the capabilities of the platform and the wide variety of experiments that external users already perform using the system

  • 221.
    Alay, Özgü
    et al.
    Simula Research Laboratory, Norway.
    Lutu, Andra
    Simula Research Laboratory, Norway.
    Rafael, García
    IMDEA Networks Institute, Spain.
    Peón Quirós, Miguel
    IMDEA Networks Institute, Spain.
    Mancuso, Vincenzo
    IMDEA Networks Institute, Spain.
    Hirsch, Thomas
    Celerway AS, Norway.
    Tobias, Dély
    Celerway AS, Norway.
    Werme, Jonas
    Celerway AS, Norway.
    Evensen, Kristian
    Celerway AS, Norway.
    Fosselie Hansen, Audun
    Celerway AS, Norway.
    Alfredsson, Stefan
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science (from 2013).
    Karlsson, Jonas
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science (from 2013).
    Brunström, Anna
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science (from 2013).
    Safari Khatouni, Ali
    Politecnico di Torino, Italy.
    Mellia, Marco
    Politecnico di Torino, Italy.
    Ajmone Marsan, Marco
    Politecnico di Torino & IMDEA Networks, Italy.
    Monno, Roberto
    Nextworks, Italy.
    Lønsethagen, Håkon
    Telenor R&D, Norway.
    Measuring and Assessing Mobile Broadband Networks with MONROE2016In: 2016 IEEE International Symposium on a World of Wireless, Mobile, and Multimedia Networks (WoWMoM), Red Hook: IEEE conference proceedings, 2016Conference paper (Refereed)
    Abstract [en]

    Mobile broadband (MBB) networks underpin numerous vital operations of the society and are arguably becoming the most important piece of the communications infrastructure. In this demo paper, our goal is to showcase the potential of a novel multi-homed MBB platform for measuring, monitoring and assessing the performance of MBB services in an objective manner. Our platform, MONROE, is composed of hundreds of nodes scattered over four European countries and a backend system that collects the measurement results. Through a user-friendly web client, the experimenters can schedule and deploy their experiments. The platform further embeds traffic analysis tools for real-time traffic flow analysis and a powerful visualization tool.

  • 222. Albert, Lars
    et al.
    Fredriksson, Odd
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Information Systems and Project Management.
    Effektivisering av golvbranschen. En studie av struktur och lönsamhet samt några idéer till förändringar1986Report (Refereed)
  • 223. Albertsson, A.
    et al.
    Johansson-Hidén, Birgitta
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Psychology. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Värmlandskliniken. Utvecklingsansvar åt alla1991Report (Other academic)
  • 224.
    Albin, Maria
    et al.
    Lunds universitet.
    Johansson, Gunn
    Stockholms universitet.
    Järvholm, Bengt
    Umeå universitet.
    Wadensjö, Eskil
    Stockholms universitet.
    Att säkra arbetslivsforskning av hög relevans och kvalitet2009In: Arbetsmarknad & Arbetsliv, ISSN 1400-9692, Vol. 15, no 2, p. 55-68Article in journal (Refereed)
    Abstract [sv]

    Arbetslivsforskningen studerar frågor som är högst relevanta för samhället. Det är mycket viktigt att forskningen håller god kvalitet. Svensk arbetslivsforskning håller en god eller mycket god vetenskaplig standard och har så gjort i åtminstone ett par decennier till följd av de stora satsningar som gjorts genom åren. Sådan forskning har överförts till förändringar i arbetslivet. Medlen till denna typ av forskning har minskat de senaste åren; först med omläggningen av forskningsfinansieringen och sedan i samband med nedläggningen av Arbetslivsinstitutet. Vi har för FAS (Forskningsrådet för arbetsliv och socialvetenskap) genomfört en kartläggning och analys av utvecklingen av arbetslivsforskningen i Sverige. Denna artikel sammanfattar vår rapport till FAS.

  • 225.
    Albin, Maria
    et al.
    Stockholms universitet .
    Wadensjö, Eskil
    Stockholms universitet.
    Arbetsmiljöns många dimensioner2019In: Arbetsmarknad & Arbetsliv, ISSN 1400-9692, Vol. 25, no 1, p. 4-7Article in journal (Other (popular science, discussion, etc.))
    Abstract [sv]

    Löner och andra former av ersättningar som till exempel avtalsförsäkringar för anställda är ofta i fokus för såväl nyhetsflödet som statistik och forskning baserad på den. Regelbundet publiceras statistik om löner för olika grupper, arbetsmarknadens parter bevakar utvecklingen för egna och andra grupper, medlare arbetar för en nå lösningar och jämförelser görs av lönenivåer och andra villkor mellan länder. Officiell lönestatistik publiceras regelbundet. Den goda tillgången på statistik underlättar forskningen vad gäller löner. När det finns konflikter mellan parterna på arbetsmarknaden, blir uppmärksamheten mycket stor speciellt då inte bara de direkt involverade påverkas utan också allmänheten. Ett av många exempel är den konflikt som SAS och piloternas fackförening hade tidigare i år.

  • 226.
    Albinsson, Gunilla
    et al.
    Institutionen för hälso och vårdvetenskap, Linnéuniversitetet.
    Arnesson, Kerstin
    Institutionen för socialt arbete, Linnéuniversitetet.
    Kommunala chefers kommunikation via digitala verktyg – betydelse för arbetssituation och chefskap.2018In: Arbetsmarknad & Arbetsliv, ISSN 1400-9692, Vol. 24, no 3-4, p. 26-44Article in journal (Refereed)
    Abstract [sv]

    Att vara chef inom en kommunal förvaltning innebär att utgöra en del av kommunens multifunktionella organisering, som i stor utsträckningstyrs av lagstiftning. Organisationen är skattefinansierad och förväntasbeakta delvis motstridiga krav såsom transparens, representation, kontroll, medbestämmande, likabehandling, öppenhet, offentlighet samt insyn i beslutsprocesser. Positionen kan närmast beskrivas som en balansakt där chefen i sin vardagsverklighet måste förhålla sig till de olika krav och förväntningar som ställs av politiker, medborgare och medarbetare. I chefskapet ingår även intern och extern informationsöverföring och ett ständigt flöde av horisontella och vertikala interaktioner. I föreliggande studie har en multimetodisk forskningsansats tillämpats i syfte att ringa in 202 kommunala chefers kommunikation genom användandet av olika digitala verktyg. Resultatet visar att de digitala verktyg som cheferna använde i sitt arbete förenklade och effektiviserade kommunikationen inom och utanför organisationen. Ett återkommande dilemma var att cheferna hade svårt att leva upp till normen om hur en chef bör vara. Fysisk närvaro i de verksamheter som man hade ansvar för upplevdes som ouppnåeligt, men tycktes heller inte krävas av medarbetarna. Organisationens digitala arbetsmiljö blev då ett sätt för cheferna att vara tillgängliga och skapa en kollaborativ kommunikation, något som stödjer idén om ett ledarskap, präglat av support.

  • 227. Albrechtsen, D.
    et al.
    Evensen, L.
    Lindeberg, A.
    Linnarud, Moira
    Karlstad University, Faculty of Arts and Education, Department of Languages.
    Nordwrite Reports II1987Other (Other (popular science, discussion, etc.))
  • 228. Albrechtsen, D.
    et al.
    Evensen, L.
    Lindeberg, A.
    Linnarud, Moira
    Karlstad University, Faculty of Arts and Education, Department of Languages.
    Nordwrite Reports III,1988Other (Other (popular science, discussion, etc.))
  • 229. Albrechtsen, D. L.
    et al.
    Evensen, A.
    Lindeberg, M.
    Linnarud, Moira
    Karlstad University, Faculty of Arts and Education, Department of Languages.
    Analysing developing discourse structure:the NORDWRITE project1991In: Foreign/Second Language Pedagogy Research ed. by R. Phillipson, E. Kellerman, L. Selinker, M. Sharwood-Smith & M. SwainArticle in journal (Refereed)
  • 230.
    Albury, Nathan
    et al.
    Hong Kong Polytechnic University, Hong Kong.
    Eisenchlas, Susana A.
    Griffith University, Australia.
    Schalley, Andrea C.
    Karlstad University, Faculty of Arts and Social Sciences (starting 2013), Department of Language, Literature and Intercultural Studies (from 2013). Griffith University, Australia.
    Cultural heritage is a child's right, so let's celebrate International Mother Language Day2018Other (Other (popular science, discussion, etc.))
  • 231. Aldaeus, Fredrik
    et al.
    Johansson, Lars-Erik
    Jönsson, Mats
    Jonsson, Gunnar
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Lindberg, Ulf
    Roeraade, Johan
    Hamp, Sven
    Escherichia Coli Behavior in an Open Dielectrophoretic Microsystem2004Conference paper (Other (popular science, discussion, etc.))
  • 232. Aldaeus, Fredrik
    et al.
    Yuan, Lin
    Jönsson, Mats
    Johansson, Lars-Erik
    Jonsson, Gunnar
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Roeraade, Johan
    Amberg, Gustav
    Dielectrophoresis of Living Cells - New Concepts and Challenges2005Conference paper (Other (popular science, discussion, etc.))
  • 233.
    Aldaz, J. M.
    et al.
    Univ Autonoma Madrid, ICMAT, E-28049 Madrid, Spain.;Univ Autonoma Madrid, Dept Matemat, E-28049 Madrid, Spain..
    Barza, Sorina
    Karlstad University, Faculty of Technology and Science, Department of Mathematics.
    Fujii, M.
    Osaka Kyoiku Univ, Dept Math, Kashiwara, Osaka 5828582, Japan..
    Moslehian, Mohammad Sal
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science.
    Advances in Operator Cauchy-Schwarz Inequalities and their Reverses2015In: Annals of Functional Analysis, ISSN 2008-8752, E-ISSN 2008-8752, Vol. 6, no 3, p. 275-295Article in journal (Refereed)
    Abstract [en]

    The Cauchy-Schwarz (C-S) inequality is one of the most famous inequalities in mathematics. In this survey article, we first give a brief history of the inequality. Afterward, we present the C-S inequality for inner product spaces. Focusing on operator inequalities, we then review some significant recent developments of the C-S inequality and its reverses for Hilbert space operators and elements of Hilbert C*-modules. In particular, we pay special attention to an operator Wielandt inequality.

  • 234.
    Aldrin, Viktor
    et al.
    Högskolan i Borås.
    Aldrin, Emilia
    Högskolan i Halmstad.
    Hur förmedlas kristendomen i läromedelstexter för gymnasieskolan? En ideologikritisk analys2018In: Nordidactica: Journal of Humanities and Social Science Education, ISSN 2000-9879, no 2018:2, p. 23-44Article in journal (Refereed)
    Abstract [en]

    This study aims at investigating how the image of the religion of Christianity is constructed in Swedish textbooks for the Upper Secondary School (gymnasieskolan), with a specific focus on the perspective from which the text considers the religion and how this perspective creates possibilities for and limitations of pupils’ identification. Introductions of Christianity through text and images were selected from six current textbooks; five printed and one digital. The method used for analysis was ideological text criticism with a combination of Linguistic and Theological perspectives. Three aspects were highlighted in the analysis: interest making strategies, demands of previous knowledge, and subject perspectives. The study showed that the examined texts did not express Christianity as the cultural norm as considered in previous research. Instead there seemed to be an ambivalence in the perspective from which the textbooks considered the religion. Demands of previous knowledge as well as subject positions varied highly both within and between textbooks.

  • 235. Alexanderson, K
    et al.
    von Knorring, M
    Parmander, M
    Tyrkkö, Arja
    Karlstad University, Faculty of Social and Life Sciences, Department of Social Studies.
    Hälso- och sjukvårdens ledning och styrning av arbetet med patienters sjukskrivning2007Report (Refereed)
  • 236. Alexandersson, Karin
    et al.
    Nyström Svensk, Ingrid
    Olsson, Helén
    Udo, Camilla
    Högskolan Dalarna, Socialt arbete.
    Försörjningsstöd som levebröd: Det ekonomiska biståndets utveckling 2007-2008, i sex kommuner i Dalarna, i relation till förändringar i det svenska välfärdssystemet2008Report (Other academic)
  • 237.
    Alfonsson, Johan
    Göteborgs universitet.
    Permanent nykomling - Om behovsanställdas villkor2015In: Arbetsmarknad & Arbetsliv, ISSN 1400-9692, Vol. 21, no 3, p. 7-22Article in journal (Refereed)
    Abstract [sv]

    I artikeln undersöks behovsanställdas relation till tillsvidareanställda, vilka problem som kan uppstå i relationerna mellan grupperna och hur behovsanställda bemöter dessa. Med utgång i Lysgaards teori om de underordnades arbetarkollektiv pekar resultaten på att bristande närhet, likhet och gemensam problembild bidrar till att behovsanställda hamnar utanför gemenskapen och behandlas kränkande. Tre handlingsstrategier som används för att möta problemen har identifierats. I artikeln framhålls att strategierna riskerar att reproducera situationen.

  • 238.
    Alfonsson, Johan
    Göteborgs universitet.
    Rec. av Magnus Hörnqvist Klass2017In: Arbetsmarknad & Arbetsliv, ISSN 1400-9692, Vol. 23, no 2, p. 111-115Article, book review (Other academic)
  • 239.
    Alfonsson, Johan
    Institutionen för sociologi och arbetsvetenskap, Göteborgs universitet.
    Recension av Magnus Hörnqvist, Klass (Liber, 2016).2017In: Arbetsmarknad & Arbetsliv, ISSN 1400-9692, Vol. 23, no 2, p. 111-115Article in journal (Other (popular science, discussion, etc.))
  • 240.
    Alfredsson, Stefan
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science.
    A Case Study of Recent Mifare Classic Field Deployments From an (In-)Security Perspective2013In: Proceedings of the 21st International Conference on Software, Telecommunications and Computer Networks (SoftCOM 2013), Split, Croatia: FESB, University of Split , 2013Conference paper (Refereed)
    Abstract [en]

    Mifare Classic is a very popular near-field communication technology that provides a shared-key, access-controlled, storage. Although the authentication protocol of Mifare Classic is compromised since half a decade, systems are still being deployed based on this technology, e.g. for access control systems and for public transport ticketing. By using commodity hardware, such as NFC enabled smartphones, by passing the security measures in some cases only require the installation and operation of a smartphone app. To this end, we present case studies of a number of recent Mifare Classic systems deployed during the last year, to serve as an illustration of practical security problems and to raise awareness thereof among NFC technology buyers and system implementors.

  • 241.
    Alfredsson, Stefan
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    A Cross-Layer Perspective on Transport Protocol Performance in Wireless Networks2012Doctoral thesis, monograph (Other academic)
    Abstract [en]

    Communication by wireless technologies has seen a tremendous growth in the last decades. Mobile phone technology and wireless broadband solutions are rapidly replacing the last-hop wireline connectivity for telephones and Internet access.  Research has, however, shown that Internet traffic can experience a performance degradation over wireless compared to wired networks.  The inherent properties of radio communication lead to a higher degree of unreliability, compared to communication by wire or fiber.  This can result in an increased amount of transmission errors, packet loss, delay and delay variations, which in turn affect the performance of the main Internet transport protocols TCP and UDP.  This dissertation examines the cross-layer relationship between wireless transmission and the resulting performance on the transport layer. To this end, experimental evaluations of TCP and UDP over a wireless 4G downlink system proposal are performed.  The experiment results show, in a holistic scenario, that link-level adaptive modulation, channel prediction, fast persistent link retransmissions, and channel scheduling, enables the transport protocols TCP and UDP to perform well and utilize the wireless link efficiently.  Further, a novel approach is proposed where a modified TCP receiver can choose to accept packets that are corrupted by bit errors. Results from network emulation experiments indicate that by accepting and acknowledging even small amounts of corrupted data, a much higher throughput can be maintained compared to standard TCP.

  • 242.
    Alfredsson, Stefan
    Karlstad University, Division for Information Technology.
    TCP in Wireless Networks: Challenges, Optimizations and Evaluations2005Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    This thesis presents research on transport layer behavior in wireless networks. As the Internet is expanding its reach to include mobile devices, it has become apparent that some of the original design assumptions for the dominant transport protocol, TCP, are approaching their limits. A key feature of TCP is the congestion control algorithm, constructed with the assumption that packet loss is normally very low, and that packet loss therefore is a sign of network congestion. This holds true for wired networks, but for mobile wireless networks non-congestion related packet loss may appear. The varying signal power inherent with mobility and handover between base-stations are two example causes of such packet loss. This thesis provides an overview of the challenges for TCP in wireless networks together with a compilation of a number of suggested TCP optimizations for these environments. A TCP modification called TCP-L is proposed. It allows an application to increase its performance, in environments where residual bit errors normally give a degraded throughput, by making a reliability tradeoff. The performance of TCP-L is experimentally evaluated with an implementation in the Linux kernel. The transport layer performance in a 4G scenario is also experimentally investigated, focusing on the impact of the link layer design and its parameterization. Further, for emulation-based protocol evaluations, controlled packet loss and bit error generation is shown to be an important aspect.

  • 243.
    Alfredsson, Stefan
    et al.
    Karlstad University, Division for Information Technology.
    Brunstrom, Anna
    Karlstad University, Division for Information Technology.
    Bit Error Tolerant Multimedia Transport2004In: Perspectives on Multimedia: Communication, Media and Information Technology, Chichester: John Wiley & Sons, 2004, p. 175-191Chapter in book (Other academic)
  • 244.
    Alfredsson, Stefan
    et al.
    Karlstad University, Division for Information Technology.
    Brunstrom, Anna
    Karlstad University, Division for Information Technology.
    TCP-L: Allowing Bit Errors in Wireless TCP2003In: Proceedings of the 12th IST Summit on Mobile and Wireless Communications: Enabling a Pervasive Wireless World / [ed] Atílio Gameiro, Institute for Operations Research and the Management Sciences (INFORMS), 2003, p. 149-154Conference paper (Refereed)
    Abstract [en]

    This paper presents a technique to improve the performance of TCP and the utilization of wireless networks.Wireless links exhibit high rates of bit errors, compared to communication over wireline or fiber. Since TCP cannotseparate packet losses due to bit errors versus congestion,all losses are treated as signs of congestion and congestionavoidance is initiated. This paper explores the possibility of accepting TCP packets with an erroneous checksum, toimprove network performance for those applications that can tolerate bit errors. Since errors may be in the TCP header aswell as the payload, the possibility of recovering the headeris discussed. An algorithm for this recovery is also presented.Experiments with an implementation have been performed,which show that large improvements in throughput can beachieved, depending on link and error characteristics.

  • 245.
    Alfredsson, Stefan
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Division for Information Technology.
    Brunstrom, Anna
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Division for Information Technology.
    Mikael, Sternad
    Signaler och System, Uppsala universitet.
    A 4G Link Level Emulator for Transport Protocol Evaluation2004In: Proceedings of The Second Swedish National Computer Networking Workshop (SNCNW), 2004, p. 19-23Conference paper (Refereed)
    Abstract [en]

    This paper presents a wireless link and networkemulator, based upon the "Wireless IP" 4G system proposalfrom Uppsala University and partners. In wireless fading down-links (base to terminals) link-level frames are scheduled andthe transmission is adapted on a fast time scale. With fastlink adaptation and fast link level retransmission, the fading properties of wireless links can to a large extent be counteractedat the physical and link layers. A purpose of the emulatoris to investigate the resulting interaction with transport layer protocols. The emulator is built on Internet technologies, andis installed as a gateway between communicating hosts. The paper gives an overview of the emulator design, and presentspreliminary experiments with three different TCP variants. The results illustrate the functionality of the emulator by showing theeffect of changing link layer parameters on the different TCP variants.

  • 246.
    Alfredsson, Stefan
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Brunstrom, Anna
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Mikael, Sternad
    Signaler och System, Uppsala universitet.
    Cross-layer analysis of TCP performance in a 4G system2007In: Proceedings of the 15th International Conference on Software, Telecommunications and Computer Networks, IEEE Computer Society, 2007Conference paper (Refereed)
    Abstract [en]

    This paper presents results from an experimental study of TCP in a wireless 4G evaluation system. Test-bed results on transport layer performance are presented and analyzed in relation to several link layer aspects. The aspects investigated are the impact of channel prediction errors, channel scheduling, delay, and adaptive modulation switch level, on TCP performance. The paper contributes a cross-layer analysis of the interaction between symbol modulation levels, different scheduling strategies, channel prediction errors and the resulting frame retransmissions effect on TCP. The paper also shows that highly persistent ARQ with fast link retransmissions do not interact negatively with the TCP retransmission timer even for short round trip delays.

  • 247.
    Alfredsson, Stefan
    et al.
    Karlstad University, Division for Information Technology. Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Brunstrom, Anna
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Division for Information Technology.
    Mikael, Sternad
    Signaler och System, Uppsala universitet.
    Emulation and Validation of a 4G System Proposal2005In: Proceedings of RadioVetenskap och Kommunikation 2005: Volume II, 2005, p. 357-362Conference paper (Refereed)
    Abstract [en]

    This paper presents a wireless link and network emulator,along with experiments and validation against the "Wireless IP" 4G system proposal from Uppsala University and partners. In wireless fading downlinks (base to terminals) link-level frames are scheduled and the transmission is adapted on a fast time scale. With fast link adaptation and fast link level retransmission, the fading properties of wireless links can to a large extent be counteracted at thephysical and link layers. The emulator has been used to experimentally investigate the resulting interaction between the transport layer and the link layer. The paper gives an overview of the emulator design, and presents experimental results with three different TCP variants in combination with various link layer characteristics.

  • 248.
    Alfredsson, Stefan
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Brunstrom, Anna
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Mikael, Sternad
    Signaler och System, Uppsala universitet.
    Impact of 4G Wireless Link Configurations on VoIP Network Performance2008In: Proceedings of the 2008 IEEE International Symposium on Wireless Communication Systems, IEEE Communications Society, 2008, p. 708-712Conference paper (Refereed)
    Abstract [en]

    The performance of applications in wireless networks is partly dependent upon the link configuration. Link characteristics varies with frame retransmission persistency, link frame retransmission delay, adaptive modulation strategies, coding, and more. The link configuration and channel conditions can lead to packet loss, delay and delay variations, which impact different applications in different ways. A bulk transfer application may tolerate delays to a large extent, while packet loss is undesirable. On the other hand, real-time interactive applications are sensitive to delay and delay variations, but may tolerate packet loss to a certain extent. This paper contributes a study of the effect of link frame retransmission persistency and delay on packet loss and latency for real-time interactive applications. The results indicate that a reliable retransmission mechanism with fast link retransmissions in the range of 2-8 ms is sufficient to provide an upper delay bound of 50 ms over the wireless link, which is well within the delay budget of voice over IP applications.

  • 249.
    Alfredsson, Stefan
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Brunstrom, Anna
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Mikael, Sternad
    Signaler och System, Uppsala universitet.
    Transport Protocol Performance over 4G Links: Emulation Methodology and Results2006In: Proceedings of the International Symposium on Wireless Communication Systems (ISWCS), IEEE Computer Society, 2006, p. 327-332Conference paper (Refereed)
    Abstract [en]

    This paper presents a wireless link and network emulator for the "Wireless IP" 4G system proposal from Uppsala University and partners. In wireless fading downlinks (base to terminals) link-level frames are scheduled and the transmission is adapted on a fast time scale. With fast link adaptation and fast link level retransmission, the fading properties of wireless links can to a large extent be counteracted at the physical and link layers. The emulator has been used to experimentally investigate the resulting interaction between the transport layer and the physical/link layer in such a downlink. The paper introduces the Wireless IP system, describes the emulator design and implementation, and presents experimental results with TCP in combination with various physical/link layer parameters. The impact of link layer ARQ persistency, adaptive modulation, prediction errors and simple scheduling are all considered.

  • 250.
    Alfredsson, Stefan
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science.
    Del Giudice, Giacomo
    Politecnico di Bari, Italy.
    Garcia, Johan
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science.
    Brunstrom, Anna
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science.
    De Cicco, Luca
    Ecole superieure d'Electricite, France; Politecnico di Bari, Italy.
    Mascolo, Saverio
    Politecnico di Bari, Italy.
    Impact of TCP Congestion Control on Bufferbloat in Cellular Networks2013In: Proceedings of the 14th IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks (WoWMoM 2013) / [ed] Angelos Lazaris, Balaji Rengarajan, IEEE Press, 2013Conference paper (Refereed)
    Abstract [en]

    The existence of excessively large and too filled network buffers, known as bufferbloat, has recently gained attention as a major performance problem for delay-sensitive applications. One important network scenario where bufferbloat may occur is cellular networks.

    This paper investigates the interaction between TCP congestion control and buffering in cellular networks. Extensive measurements have been performed in commercial 3G, 3.5G and 4G cellular networks, with a mix of long and short TCP flows using the CUBIC, NewReno and Westwood+ congestion control algorithms. The results show that the completion times of short flows increase significantly when concurrent long flow traffic is introduced. This is caused by increased buffer occupancy from the long flows. In addition, for 3G and 3.5G the completion times are shown to depend significantly on the congestion control algorithms used for the background flows, with CUBIC leading to significantly larger completion times.

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