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  • 151.
    Ahlström, Richard
    Mid Sweden University, Faculty of Human Sciences, Department of Social Sciences.
    Debt2011In: Encyclopedia of consumer culture / [ed] Southerton, Dale, New York: Sage Publications, 2011, 1Chapter in book (Refereed)
  • 152.
    Ahlström, Richard
    Mid Sweden University, Faculty of Human Sciences, Department of Social Sciences.
    The emotional impact of severe debts on the individual2007In: Proceedings of the Nordic Policy Research Conference 2007, 2007Conference paper (Refereed)
  • 153.
    Ahlström, Richard
    et al.
    Mid Sweden University, Faculty of Human Sciences, Department of Social Sciences.
    Savemark, Mattias
    Mid Sweden University, Faculty of Human Sciences, Department of Social Sciences.
    Dödsfall under och efter skuldsanering2010Report (Other academic)
    Abstract [sv]

    Konsumentverket har enligt skuldsaneringslagen (SFS 2006:548) uppdrag att stödja och vägleda den budget- och skuldrådgivning som kommunerna skall svara för. Detta innefattar bland annat utbildning, metodutveckling, kunskapsbyggande och information samt utvärdering. Som ett led i detta har verket initierat en utvärdering av verksamheten från, såväl ett gäldenärsperspektiv som ur ett samhällsekonomiskt perspektiv. Föreliggande rapport är en del av en kommande större rapport rörande bl.a. ekonomi och hälsoaspekter i samband med överskuldsättning och skuldrådgivning i kommunerna. Författare är docent Richard Ahlstöm och forskningsassistent Mattias Savemark. De slutsatser och ståndpunkter som redovisas här är författarnas egna och de ansvarar för delrapportens riktighet och innehåll.

  • 154.
    Ahlström, Therese
    et al.
    Mid Sweden University, Faculty of Human Sciences, Department of Social Work.
    Olsson, Annette
    Mid Sweden University, Faculty of Human Sciences, Department of Social Work.
    Att tala med tangenterna: En intervjustudie om ungdomars interaktion och identitetsskapande genom sociala medier2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet med denna studie var att beskriva och analysera hur ungdomar använder och förhåller sig till sociala medier samt hur de uppfattar och reflekterar kring möjligheter och begränsningar i förhållande till sitt identitetsskapande. Vi har genom en kvalitativ forsknings design genomfört semistrukturerade intervjuer med sex ungdomar. Varefter vi noga lyssnat igenom intervjuerna, transkriberat, sammanställt och analyserat resultatet. Vi valde ungdomar för att de är inne i en identitetsskapande ålder samt att de är representativa användare av sociala medier. Resultatet visar att samtliga ungdomar är i någon form beroende av den mediala interaktionen och att detta påverkar identitetsskapandet. Vidare visar också resultatet att det mänskliga mötet är betydande då reaktioner direkt kan tolkas i en så kallad ansikte mot ansikte interaktion.

  • 155.
    Ahlund, Claes
    Uppsala Universitet.
    Den skandinaviska universitetsromanen 1877-18901990Doctoral thesis, monograph (Other academic)
  • 156. Ahlund, Claes
    Den svenska invasionsberättelsen - en bortglömd litteratur2003In: Tidskrift för litteraturvetenskap, ISSN 1104-0556, no 3, 82-103 p.Article in journal (Refereed)
  • 157.
    Ahlund, Claes
    Mid Sweden University, Faculty of Human Sciences, Department of Humanities.
    Den undflyende renässansen. Heidenstam, nittitalet och livsglädjen2008In: Aorta, ISSN 1402-7984, no 19, 47-50 p.Article in journal (Other academic)
  • 158.
    Ahlund, Claes
    Mid Sweden University, Faculty of Human Sciences, Department of Humanities.
    Diktare i krig: K.G. Ossiannilsson, Bertil Malmberg och Ture Nerman från debuten till 19202007Book (Other academic)
  • 159.
    Ahlund, Claes
    Uppsala universitet.
    Doktor Glas och den fria viljan1985In: Horisont, ISSN 0439-5530, no 1, 12-21 p.Article in journal (Other academic)
  • 160.
    Ahlund, Claes
    Mid Sweden University, Faculty of Human Sciences, Department of Humanities.
    Empiriker i det levande livets land: Henrik Schücks Wivalliusbild2007In: Hela världen är en teater: Åtta essäer om Lars Wivallius, Stockholm: Kungl. Vitterhets Historie och Antikvitets Akademien, 2007, 268- p.Chapter in book (Other academic)
  • 161. Ahlund, Claes
    En mental militarisering: den svenska litteraturen före och under första världskriget2003In: Samlaren : tidskrift, ISSN 0348-6133, Vol. 124, 134-157 p.Article in journal (Refereed)
  • 162.
    Ahlund, Claes
    Uppsala universitet.
    Esteticismens unghinkar och aktionens anteckningar kring händelserna 19091986In: Hjärnstorm, ISSN 0348-6958, no 25/26, 17-19 p.Article in journal (Other academic)
  • 163. Ahlund, Claes
    Fallets lag och jagets stjärna: en studie i Stig Dagermans författarskap = [The law of the fall and the star of the self] : [a study of the writings of Stig Dagerman]1998Book (Other academic)
  • 164.
    Ahlund, Claes
    Uppsala universitet.
    Folkhemsnattens lågande Lucifer: En introduktion till Hans Granlids romanvärld1987In: Hjärnstorm, ISSN 0348-6958, no 28, 11-15 p.Article in journal (Other academic)
  • 165. Ahlund, Claes
    Från epifani till sammanbrott.: Novellstrukturer hos Lars Ahlin och Stig Dagerman1998In: Nordlit : arbeidstidsskrift i litteratur, ISSN 0809-1668, no 3, 87-120 p.Article in journal (Other academic)
  • 166. Ahlund, Claes
    Författarna och första världskriget.: De krigförande länderna och det neutrala Sverige2001In: Vänbok till Alvar Wallinder, Gävle: Högskolan i Gävle , 2001, 119- p.Chapter in book (Other academic)
  • 167. Ahlund, Claes
    Förklaringsögonblickets förvandlingar: Om Dagermans transformation av en ahlinsk epifanimodell1998In: Tidskrift för litteraturvetenskap, ISSN 1104-0556, Vol. 27, no 1, 25-48 p.Article in journal (Refereed)
  • 168.
    Ahlund, Claes
    Mid Sweden University, Faculty of Human Sciences, Department of Humanities.
    Individen, nationen och romanen: Från Vilhelm Mobergs Soldat med brutet gevär till Salman Rushdies Midnight’s Children2008In: Provins, ISSN 0280-9974, no 4, 70-77 p.Article in journal (Other academic)
  • 169.
    Ahlund, Claes
    Mid Sweden University, Faculty of Human Sciences, Department of Humanities.
    Kampdiktarens gränser och begränsningar: exemplet K. G. Ossiannilsson2008In: Gränser i nordisk litteratur / Borders in Nordic literature, vol. I: IASS XXVI 2006. Vol. 1 / [ed] Heidi Grönstrand & Ulrika Gustafsson, Åbo, Finland: Åbo Akademis Förlag, 2008, 119-126 p.Conference paper (Refereed)
  • 170. Ahlund, Claes
    Krig och kultur i konservativ och radikal belysning: Annie Åkerhielm och Frida Stéenhoff från sekelskiftet till första världskriget2005In: Samlaren: tidskrift för svensk litteraturvetenskaplig forskning, ISSN 0348-6133, E-ISSN 2002-3871, Vol. 126, 97-150 p.Article in journal (Refereed)
  • 171. Ahlund, Claes
    Medusas huvud: dekadensens tematik i svensk sekelskiftesprosa = [The head of Medusa] : [the theme of decadence in Swedish prose of the turn of the century]1994Book (Other academic)
  • 172.
    Ahlund, Claes
    Mid Sweden University, Faculty of Human Sciences, Department of Humanities.
    Om dekadensens externalisering: exemplet Bertil Malmberg2006In: Aorta : journal för retrogardistisk kultur, ISSN 1402-7984, 40-45 p.Article in journal (Other scientific)
  • 173. Ahlund, Claes
    Om Kristussymboliken i Stig Dagermans Bröllopsbesvär1998In: Horisont, ISSN 0439-5530, no 1, 59-66 p.Article in journal (Other academic)
  • 174. Ahlund, Claes
    Sterilitet och kysk dekadens: Sekelslut i Sverige. Tema: Fin de siècle.1993In: Allt om böcker, ISSN 0280-2260, no 5-6, 16-20 p.Article in journal (Other academic)
  • 175. Ahlund, Claes
    Stig Dagerman som lyriker i "Birgitta svit"1996In: Samlaren: tidskrift, ISSN 0348-6133, Vol. 1996, 28-50 p.Article in journal (Refereed)
  • 176. Ahlund, Claes
    Strindberg och sekelskiftets fysionomi: dekadens och nydaning i Götiska rummen och Svarta fanor2002In: On the threshold: new studies in Nordic literature / [ed] Janet Garton and Michael Robinson, Norwich: Norvik Press, 2002, 490- p.Chapter in book (Other academic)
  • 177.
    Ahlund, Claes
    Mid Sweden University, Faculty of Human Sciences, Department of Humanities.
    Tyrannen, riksföreståndaren och diktatorn: K. G. Ossiannilsson som fascistisk diktare2006In: Tidskrift för litteraturvetenskap, ISSN 1104-0556, no 2, 27-53 p.Article in journal (Refereed)
  • 178.
    Ahlund, Claes
    Mid Sweden University, Faculty of Human Sciences, Department of Humanities.
    "Under späkelsernas gissel. Karlfeldt och kriget"2008In: Edda. Nordisk tidsskrift for litteraturforskning, ISSN 0013-0818, Vol. 95, no 3, 234-248 p.Article in journal (Refereed)
    Abstract [en]

     

    The war poetry of Erik Axel Karlfeldt (1864-1931) is a neglected part of the poet's work. The aim of this article is to discuss three poems from Flora och Bellona (1918): "Det röda korset" ("The Red Cross"), "Svart Jul" ("Black Christmas") and "En pesthymn" ("A Hymn of Pestilence"). Attention is paid to the ideological level of the poems, but also to their poetic structure. The poems are related to Peter Hallberg's discussion of Karlfeldt's archaistic imagery, to Esaias Tegnér's "Svea", but also to the contemporary political poetry of outspoken nationalists and socialists. Compared to the explicit political poetry, Karlfeldt's poetry is complex, often ambivalent in its criticism of both belligerents and alternately displaying despair and optimism. "En pesthymn" can be seen as a turning point, mirroring the outbreak in 1918 of the Finnish Civil War. In this poem, the ambivalent moral judgements of the poet's preceding war poetry are replaced by unequivocal political support for the "Whites".

     

     

     

     

  • 179. Ahlund, Claes
    et al.
    Landgren, Bengt
    Från etableringsfas till konsolidering: svensk akademisk litteraturundervisning 1890-19462003Book (Other academic)
  • 180.
    Ahlén, Emelie
    et al.
    Mid Sweden University, Faculty of Human Sciences, Department of Social Work.
    Rahmani, Shermineh
    Mid Sweden University, Faculty of Human Sciences, Department of Social Work.
    Hur unga utlandsfödda invandrare blir bemötta i det svenska samhället.: En kvalitativ och kvantitativ studie om diskriminering och rasism2010Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Sammanfattning: Ungdomar med utländsk bakgrund har enligt tidigare studier sämre förutsättning i skolan, arbeten och inom rättsväsendet, på grund av diskriminering. Syftet med denna uppsats har varit att ta reda på hur unga utlandsfödda ungdomar blir bemötta i det svenska samhället, samt att se om det finns vissa specifika mönster till varför det uppstår diskriminering i bland annat skolan. Till vår undersökning använde vi oss av teorier om - diskriminering och rasism, som används i analysen av det empiriska materialet. Vår utgångspunkt i uppsatsen har varit att ta reda på varför diskriminering och rasism sker i samhället. Vi hade ett antal frågeställningar som kan ses nedan, som besvarats i arbetet.

    • Hur blir invandrarungdomar bemötta i det svenska samhället utifrån deras etniska bakgrund?
    • Spelar ungdomarnas genus någon roll i hur de blir bemötta i det offentliga samhället?
    • Finns det skillnader mellan ungdomar med olika bakgrund beroende på deras vilken världsdel de kommer ifrån?
    • Påverkar ungdomarnas socioekonomiska och kulturella bakgrund, hur de blir bemötta i det svenska samhället?

           För att besvara dessa frågeställningar, delade vi ut enkäter till 42 ungdomar i en mellan stor stad i åldrarna 16 – 24 år i olika skolor. När resultatet av enkäterna var sammanställda valde vi att ha en fokusgrupp med fyra deltagande som hade deltagit i enkätundersökningen. Syftet med att ha en fokusgrupp var att få en fördjupad kunskap om vissa svar kring rasism och diskriminering. Vårt resultat i studien visade att ungdomar med utländsk bakgrund, blir diskriminerade ute i samhället utav skolan, polisen, socialtjänsten, i affärer, på arbetsplatser samt på andra platser i samhället som till exempel på bussen. Dessa slutsatser stärktes och jämfördes sedan med tidigare forskning i en analysdel, samt en avslutad diskussion.

  • 181.
    Ahmad, Hana
    et al.
    Mid Sweden University, Faculty of Human Sciences, Department of Social Work.
    Zouari, Bouchra
    Mid Sweden University, Faculty of Human Sciences, Department of Social Work.
    Kvinnlig köönsstympning i Sverige - En kvalitativ studie om Socialtjänstens arbete mot kvinnlig köönsstympning2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
  • 182.
    Ahmad, Jawad
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
    Andersson, Henrik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
    Sidén, Johan
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
    Sitting Posture Recognition using Screen Printed Large Area Pressure Sensors2017In: 2017 IEEE Sensors Proceedings, IEEE, 2017, 232-234 p.Conference paper (Refereed)
    Abstract [en]

    In the biomedical sector, pressure sensors exhibit an important role towards monitoring and recognition of sitting posture for wheelchair users, which is helpful for pressure ulcer prevention and cure.  In this paper, a flexible and inexpensive screen printed large area pressure sensing system is presented. The large area sensor comprise three layers, is able to cancel-out false pressure detection, and achieves a sitting classification accuracy over 80 percent. The sensor matrix contains 16 sensors distributed over an area of 23.5 cm × 21.5 cm and the pressure points are monitored at a scanning rate of 77 Hz. The sensor system provides wireless communication and a Windows based GUI is developed that allows real-time presentation of pressure data by means of a pressure map. The presented sensor design targets smart wheelchairs but is suitable for any low cost and high throughput pressure distribution monitoring systems. 

  • 183.
    Ahmad, Naeem
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Modelling and optimization of sky surveillance visual sensor network2012Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    A Visual Sensor Network (VSN) is a distributed system of a largenumber of camera sensor nodes. The main components of a camera sensornode are image sensor, embedded processor, wireless transceiver and energysupply. The major difference between a VSN and an ordinary sensor networkis that a VSN generates two dimensional data in the form of an image, whichcan be exploited in many useful applications. Some of the potentialapplication examples of VSNs include environment monitoring, surveillance,structural monitoring, traffic monitoring, and industrial automation.However, the VSNs also raise new challenges. They generate large amount ofdata which require higher processing powers, large bandwidth requirementsand more energy resources but the main constraint is that the VSN nodes arelimited in these resources.This research focuses on the development of a VSN model to track thelarge birds such as Golden Eagle in the sky. The model explores a number ofcamera sensors along with optics such as lens of suitable focal length whichensures a minimum required resolution of a bird, flying at the highestaltitude. The combination of a camera sensor and a lens formulate amonitoring node. The camera node model is used to optimize the placementof the nodes for full coverage of a given area above a required lower altitude.The model also presents the solution to minimize the cost (number of sensornodes) to fully cover a given area between the two required extremes, higherand lower altitudes, in terms of camera sensor, lens focal length, camera nodeplacement and actual number of nodes for sky surveillance.The area covered by a VSN can be increased by increasing the highermonitoring altitude and/or decreasing the lower monitoring altitude.However, it also increases the cost of the VSN. The desirable objective is toincrease the covered area but decrease the cost. This objective is achieved byusing optimization techniques to design a heterogeneous VSN. The core ideais to divide a given monitoring range of altitudes into a number of sub-rangesof altitudes. The sub-ranges of monitoring altitudes are covered by individualsub VSNs, the VSN1 covers the lower sub-range of altitudes, the VSN2 coversthe next higher sub-range of altitudes and so on, such that a minimum cost isused to monitor a given area.To verify the concepts, developed to design the VSN model, and theoptimization techniques to decrease the VSN cost, the measurements areperformed with actual cameras and optics. The laptop machines are used withthe camera nodes as data storage and analysis platforms. The area coverage ismeasured at the desired lower altitude limits of homogeneous as well asheterogeneous VSNs and verified for 100% coverage. Similarly, the minimumresolution is measured at the desired higher altitude limits of homogeneous aswell as heterogeneous VSNs to ensure that the models are able to track thebird at these highest altitudes.

  • 184.
    Ahmad, Naeem
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
    Modelling, optimization and design of visual sensor networks for sky surveillance2013Doctoral thesis, comprehensive summary (Other academic)
  • 185.
    Ahmad, Naeem
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
    Imran, Muhammad
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
    Khursheed, Khursheed
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
    Lawal, Najeem
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
    O'Nils, Mattias
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
    Model, placement optimization and verification of a sky surveillance visual sensor network2013In: International Journal of Space-Based and Situated Computing (IJSSC), ISSN 2044-4893, E-ISSN 2044-4907, Vol. 3, no 3, 125-135 p.Article in journal (Refereed)
    Abstract [en]

    A visual sensor network (VSN) is a distributed system of a large number of camera nodes, which generates two dimensional data. This paper presents a model of a VSN to track large birds, such as golden eagle, in the sky. The model optimises the placement of camera nodes in VSN. A camera node is modelled as a function of lens focal length and camera sensor. The VSN provides full coverage between two altitude limits. The model can be used to minimise the number of sensor nodes for any given camera sensor, by exploring the focal lengths that fulfils both the full coverage and minimum object size requirement. For the case of large bird surveillance, 100% coverage is achieved for relevant altitudes using 20 camera nodes per km² for the investigated camera sensors. A real VSN is designed and measurements of VSN parameters are performed. The results obtained verify the VSN model.

  • 186.
    Ahmad, Naeem
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
    Imran, Muhammad
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
    Khursheed, Khursheed
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
    Lawal, Najeem
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
    O'Nils, Mattias
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
    Solution space exploration of volumetric surveillance using a general taxonomy2013In: Proceedings of SPIE - The International Society for Optical Engineering / [ed] Daniel J. Henry, 2013, Art. no. 871317- p.Conference paper (Refereed)
    Abstract [en]

    Visual surveillance systems provide real time monitoring of the events or the environment. The availability of low cost sensors and processors has increased the number of possible applications of these kinds of systems. However, designing an optimized visual surveillance system for a given application is a challenging task, which often becomes a unique design task for each system. Moreover, the choice of components for a given surveillance application out of a wide spectrum of available alternatives is not an easy job. In this paper, we propose to use a general surveillance taxonomy as a base to structure the analysis and development of surveillance systems. We demonstrate the proposed taxonomy for designing a volumetric surveillance system for monitoring the movement of eagles in wind parks aiming to avoid their collision with wind mills. The analysis of the problem is performed based on taxonomy and behavioral and implementation models are identified to formulate the solution space for the problem. Moreover, we show that there is a need for generalized volumetric optimization methods for camera deployment.

  • 187.
    Ahmad, Naeem
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Khursheed, Khursheed
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Imran, Muhammad
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Lawal, Najeem
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    O'Nils, Mattias
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Cost Optimization of a Sky Surveillance Visual Sensor Network2012In: Proceedings of SPIE - The International Society for Optical Engineering, Belgium: SPIE - International Society for Optical Engineering, 2012, Art. no. 84370U- p.Conference paper (Refereed)
    Abstract [en]

    A Visual Sensor Network (VSN) is a network of spatially distributed cameras. The primary difference between VSN and other type of sensor network is the nature and volume of information. A VSN generally consists of cameras, communication, storage and central computer, where image data from multiple cameras is processed and fused. In this paper, we use optimization techniques to reduce the cost as derived by a model of a VSN to track large birds, such as Golden Eagle, in the sky. The core idea is to divide a given monitoring range of altitudes into a number of sub-ranges of altitudes. The sub-ranges of altitudes are monitored by individual VSNs, VSN1 monitors lower range, VSN2 monitors next higher and so on, such that a minimum cost is used to monitor a given area. The VSNs may use similar or different types of cameras but different optical components, thus, forming a heterogeneous network.  We have calculated the cost required to cover a given area by considering an altitudes range as single element and also by dividing it into sub-ranges. To cover a given area with given altitudes range, with a single VSN requires 694 camera nodes in comparison to dividing this range into sub-ranges of altitudes, which requires only 96 nodes, which is 86% reduction in the cost.

  • 188.
    Ahmad, Naeem
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
    Khursheed, Khursheed
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
    Imran, Muhammad
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
    Lawal, Najeem
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
    O'Nils, Mattias
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
    Modeling and Verification of a Heterogeneous Sky Surveillance Visual Sensor Network2013In: International Journal of Distributed Sensor Networks, ISSN 1550-1329, E-ISSN 1550-1477, Art. id. 490489- p.Article in journal (Refereed)
    Abstract [en]

    A visual sensor network (VSN) is a distributed system of a large number of camera nodes and has useful applications in many areas. The primary difference between a VSN and an ordinary scalar sensor network is the nature and volume of the information. In contrast to scalar sensor networks, a VSN generates two-dimensional data in the form of images. In this paper, we design a heterogeneous VSN to reduce the implementation cost required for the surveillance of a given area between two altitude limits. The VSN is designed by combining three sub-VSNs, which results in a heterogeneous VSN. Measurements are performed to verify full coverage and minimum achieved object image resolution at the lower and higher altitudes, respectively, for each sub-VSN. Verification of the sub-VSNs also verifies the full coverage of the heterogeneous VSN, between the given altitudes limits. Results show that the heterogeneous VSN is very effective to decrease the implementation cost required for the coverage of a given area. More than 70% decrease in cost is achieved by using a heterogeneous VSN to cover a given area, in comparison to homogeneous VSN. © 2013 Naeem Ahmad et al.

  • 189.
    Ahmad, Naeem
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Lawal, Najeem
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    O'Nils, Mattias
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Oelmann, Bengt
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Imran, Muhammad
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Khursheed, Khursheed
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Model and placement optimization of a sky surveillance visual sensor network2011In: Proceedings - 2011 International Conference on Broadband and Wireless Computing, Communication and Applications, BWCCA 2011, IEEE Computer Society, 2011, 357-362 p.Conference paper (Refereed)
    Abstract [en]

    Visual Sensor Networks (VSNs) are networks which generate two dimensional data. The major difference between VSN and ordinary sensor network is the large amount of data. In VSN, a large number of camera nodes form a distributed system which can be deployed in many potential applications. In this paper we present a model of the physical parameters of a visual sensor network to track large birds, such as Golden Eagle, in the sky. The developed model is used to optimize the placement of the camera nodes in the VSN. A camera node is modeled as a function of its field of view, which is derived by the combination of the lens focal length and camera sensor. From the field of view and resolution of the sensor, a model for full coverage between two altitude limits has been developed. We show that the model can be used to minimize the number of sensor nodes for any given camera sensor, by exploring the focal lengths that both give full coverage and meet the minimum object size requirement. For the case of large bird surveillance we achieve 100% coverage for relevant altitudes using 20 camera nodes per km2 for the investigated camera sensors.

  • 190.
    Ahmad, Naeem
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
    O'Nils, Mattias
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
    Lawal, Najeem
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
    A taxonomy of visual surveillance systems2013Report (Other academic)
    Abstract [en]

    The increased security risk in society and the availability of low cost sensors and processors has expedited the research in surveillance systems. Visual surveillance systems provide real time monitoring of the environment. Designing an optimized surveillance system for a given application is a challenging task. Moreover, the choice of components for a given surveillance application out of a wide spectrum of available products is not an easy job.

     

    In this report, we formulate a taxonomy to ease the design and classification of surveillance systems by combining their main features. The taxonomy is based on three main models: behavioral model, implementation model, and actuation model. The behavioral model helps to understand the behavior of a surveillance problem. The model is a set of functions such as detection, positioning, identification, tracking, and content handling. The behavioral model can be used to pinpoint the functions which are necessary for a particular situation. The implementation model structures the decisions which are necessary to implement the surveillance functions, recognized by the behavioral model. It is a set of constructs such as sensor type, node connectivity and node fixture. The actuation model is responsible for taking precautionary measures when a surveillance system detects some abnormal situation.

     

    A number of surveillance systems are investigated and analyzed on the basis of developed taxonomy. The taxonomy is general enough to handle a vast range of surveillance systems. It has organized the core features of surveillance systems at one place. It may be considered an important tool when designing surveillance systems. The designers can use this tool to design surveillance systems with reduced effort, cost, and time.

  • 191.
    Ahmad, Nisar
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
    Design and Implementation of a High Frequency Flyback Converter2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The power supply designers choose flyback topology due to its promising features of design simplicity, cost effectiveness and multiple outputs handling capability. The designed product based on flyback topology should be smaller in size, cost effective and energy efficient. Similarly, designers focus on reducing the circuit losses while operating at high frequencies that affect the converter efficiency and performance. Based on the above circumstances, an energy efficient open loop high frequency flyback converter is designed and operated in MHz frequency region using step down multilayer PCB planar transformer. The maximum efficiency of 84.75% is observed and maximum output power level reached is 22.8W. To overcome the switching losses, quasi-resonant soft switching technique is adopted and a high voltage CoolMOS power transistor is used.

  • 192.
    Ahmad, Waqas
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Olsson, Roger
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Sjöström, Mårten
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Interpreting Plenoptic Images as Multi-View Sequences for Improved Compression2017In: ICIP 2017, 2017Conference paper (Refereed)
    Abstract [en]

    Over the last decade, advancements in optical devices have made it possible for new novel image acquisition technologies to appear. Angular information for each spatial point is acquired in addition to the spatial information of the scene that enables 3D scene reconstruction and various post-processing effects. Current generation of plenoptic cameras spatially multiplex the angular information, which implies an increase in image resolution to retain the level of spatial information gathered by conventional cameras. In this work, the resulting plenoptic image is interpreted as a multi-view sequence that is efficiently compressed using the multi-view extension of high efficiency video coding (MV-HEVC). A novel two dimensional weighted prediction and rate allocation scheme is proposed to adopt the HEVC compression structure to the plenoptic image properties. The proposed coding approach is a response to ICIP 2017 Grand Challenge: Light field Image Coding. The proposed scheme outperforms all ICME contestants, and improves on the JPEG-anchor of ICME with an average PSNR gain of 7.5 dB and the HEVC-anchor of ICIP 2017 Grand Challenge with an average PSNR gain of 2.4 dB.

  • 193.
    Ahmad, Waqas
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Olsson, Roger
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Sjöström, Mårten
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Interpreting Plenoptic Images as Multi-View Sequences for Improved Compression2017Data set
    Abstract [en]

    The paper is written in the response to ICIP 2017, Grand challenge on plenoptic image compression. The input image format and compression rates set out by the competition are followed to estimate the results.

  • 194.
    Ahmed, Leila
    Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences.
    Hälsofrämjande ledarskap ur anställdas perspektiv: - En kvalitativ intervjustudie2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 195.
    Ahmed Shire, F Sagal
    Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences.
    Healthcare professional´s experience of promoting maternal mental health: a qualitative study in Saudi Arabia.2015Independent thesis Advanced level (degree of Master (Two Years)), 10 credits / 15 HE creditsStudent thesis
  • 196.
    Ahmetgjekaj, Fatmir
    Mid Sweden University, Faculty of Human Sciences, Department of Humanities.
    New age i massmediernas tid och rum2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 197.
    Ahnelöv, Malin
    Mid Sweden University, Faculty of Human Sciences, Department of Tourism Studies and Geography.
    När millenniegenerationen väljer Airbnb: En kvalitativ fallstudie av Stockholm2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 198.
    Ahola, Paulina
    et al.
    Mid Sweden University, Faculty of Human Sciences, Department of Social Work.
    Holm, Yvonne
    Mid Sweden University, Faculty of Human Sciences, Department of Social Work.
    "Jag går inte och väntar på något mirakel, jag är väl zombie på mitt vis" - En kvalitativ studie om äldres syn på psykisk ohälsa och sin psykosociala situation2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
  • 199. Ahonen-Jonnarth, U.
    et al.
    Van Hees, P.A.W.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Lundström, Ulla
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Finlay, R.D.
    Organic acids produced by mycorrhizal Pinus sylvestris exposed to elevated aluminium and heavy metals concentrations2000In: New Phytologist, ISSN 0028-646X, E-ISSN 1469-8137, Vol. 146, no 3, 557-567 p.Article in journal (Refereed)
    Abstract [en]

    A cultivation method was developed to enable exposure of ectomycorrhizal plants with intact extramatrical mycelium to solutions containing different concentrations of aluminium or heavy metals. Pinus sylvestris seedlings colonized by Suillus variegatus (two isolates), Rhizopogon roseolus or Paxillus involutus (two isolates) were used. Seedlings were transferred to Petri dishes containing glass beads and exposed to elevated concentrations of Al, Cd, Cu, or Ni in two ways: immediately following transfer; and after allowing mycorrhizal seedlings to develop an extraradical mycelium that colonized the interface between the upper surface of the beads and the metal-containing solution. Production of organic acids in mycorrhizal and non-mycorrhizal systems was measured by withdrawing samples from the solution and analyzing by HPLC. In most experiments, levels of oxalic acid were significantly higher in mycorrhizal treatments than in non-mycorrhizal controls. The measured levels of organic acids were variable, but the results obtained suggest that production of oxalic acid is stimulated by exposure to elevated Al in mycorrhizal seedlings colonized by S. variegatus and R. roseolus. Elevated Al concentrations also increased oxalic acid production by non-mycorrhizal seedlings significantly in two of four Al experiments performed, but the measured concentrations were significantly lower than in corresponding mycorrhizal treatments in both cases. Malonic acid was found in the culture solution of non-mycorrhizal had P. involutus-colonized seedlings, but only trace amounts were found in S. variegatus or R. roseolus-infected seedlings. Citric, shikimic, lactic, acetic, propionic, fumaric, formic, iso-butyric and butyric acid were found in variable concentrations. Production of oxalic acid by seedlings ColoniZed by S. variegatus BL or P. involutus was not stimulated by exposure to 0.44 μM Cd or 17 μM Ni. Exposure to 0.157 mM CU in two separate experiments using P. involutus 87.017 and two strains of S. variegatus (BL and 159) appeared to stimulate production of oxalic acid irrespective of mycorrhizal status or species.

  • 200.
    Ahrling, Jane
    Mid Sweden University, Faculty of Human Sciences, Department of Humanities.
    A Feminist Reading of  The House of the Spirits,  Song of Solomon,  and  One Hundred Years of Solitude                            2010Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
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