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  • 1151.
    Ahmed, Ali
    et al.
    Växjö universitet.
    Ekberg, Jan
    Växjö universitet.
    Kan diskriminering studeras med experimentella metoder?2006In: Flervetenskapliga perspektiv i migrationsforskning: årsbok 2006 från forskningsprofilen Arbetsmarknad, migration och etniska relationer (AMER) vid Växjö universitet / [ed] K. Hjelm, Växjö University Press , 2006, p. 45-58Chapter in book (Other academic)
  • 1152.
    Ahmed, Ali
    et al.
    Växjö universitet.
    Ekberg, Jan
    Växjö universitet.
    Kan kvinnliga personalchefer motverka diskriminering av invandrare?2005In: Ekonomisk Debatt, ISSN 0345-2646, Vol. 33, no 8, p. 72-77Article in journal (Other academic)
    Abstract [sv]

    I denna artikel presenteras resultaten av en experimentell studie om etnisk diskriminering.Undersökningen visar att det främst är infödda män som tenderar att ha ett diskriminerande beteende. I Sverige fi nns lagstiftning som förbjuder etnisk diskriminering. Vi har också en särskild myndighet – diskrimineringsombudsmannen – som skall motverka etnisk diskriminering. Den presenterade undersökningen kan ge en ny infallsvinkel. Ett sätt att motverka diskriminering av invandrare kan vara att se till att andelen kvinnor som är personalchefer i företag och myndigheter ökar. Frågan om etnisk diskriminering är kanske också en jämställdhetsfråga.

  • 1153.
    Ahmed, Ali
    et al.
    Linköping University, Department of Management and Engineering, Economics. Linköping University, Faculty of Arts and Sciences.
    Granberg, Mark
    Linköping University, Department of Management and Engineering, Economics.
    Lång, Elisabeth
    Linköping University, Department of Management and Engineering, Economics. Linköping University, Faculty of Arts and Sciences.
    Does having ones own place to live make someone more employable?2017In: Applied Economics Letters, ISSN 1350-4851, E-ISSN 1466-4291, Vol. 24, no 18, p. 1327-1330Article in journal (Refereed)
    Abstract [en]

    This article encapsulates the findings of a randomized correspondence test field experiment investigating whether job candidates home status influences their employability. More than 2000 employers with vacancies in the Swedish labour market received a job application from a fictitious candidate. A job candidates home status (his or her own place to live or temporary housing with a friend) was randomized across employers. Results show that home status indeed affected the number of positive employer responses received by job candidates, mainly in low-skilled occupations. Not having a place to live at the time of the application proved a disadvantage when applying for positions within but an advantage when applying for positions outside the city of residence at the time of the application.

  • 1154.
    Ahmed, Ali
    et al.
    Växjö University, Sweden.
    Hammarstedt, Mats
    Växjö University, Sweden.
    Detecting discrimination against homosexuals: evidence from a field experiment on the Internet2009In: Economica, ISSN 0013-0427, E-ISSN 1468-0335, Vol. 76, no 303, p. 588-597Article in journal (Refereed)
    Abstract [en]

    This paper presents the first field experiment studying discrimination against homosexuals on the housing market. The study is conducted on the rental housing market in Sweden using the internet as a research platform. Two fictitious couples, one heterosexual and one male homosexual, apply for vacant rental apartments advertised by landlords on the internet. Our findings show that homosexual males are discriminated against on the Swedish housing market, since the homosexual couple gets far fewer call-backs and fewer invitations to further contacts and to showings of apartments than the heterosexual couple.

  • 1155.
    Ahmed, Ali
    et al.
    Göteborgs universitet och Växjö universitet.
    Hammarstedt, Mats
    Växjö universitet.
    Diskrimineras homosexuella? Några erfarenheter från svensk ekonomisk forskning2008In: Ekonomisk Debatt, ISSN 0345-2646, Vol. 36, no 8, p. 31-40Article in journal (Other academic)
    Abstract [sv]

    Diskriminering av homosexuella är förbjudet i Sverige. Trots detta är den ekonomiska forskning som finns på området begränsad. I artikeln presenteras resultat från forskningsprojekt rörande homosexuellas situation på arbets- och bostadsmarknaden i Sverige. Resultaten är i linje med resultat från internationell forskning. Homosexuella män har lägre arbetsinkomster än heterosexuella män. Diskriminering och skillnader i fördelningen av marknadsarbete och hushållarbete mellan homo- och heterosexuella hushåll framförs som förklaringar till detta. Vidare diskrimineras homosexuella män på bostadsmarknaden. Beträffande kvinnor finner vi inga statistiskt signifikanta skillnader mellan homo- och heterosexuella. Avslutningsvis presenteras några tänkbara förklaringar till varför homosexuella män diskrimineras medan detta inte är fallet för homosexuella kvinnor.

  • 1156.
    Ahmed, Ali
    et al.
    Växjö universitet.
    Hammarstedt, Mats
    Växjö universitet.
    Diskriminering på bostadsmarknaden: effekten av att heta Mohammed2007In: Ekonomisk Debatt, ISSN 0345-2646, Vol. 35, no 6, p. 34-41Article in journal (Other academic)
    Abstract [sv]

    I denna artikel studeras diskriminering på svensk bostadsmarknad med hjälp av ett fältexperiment utfört på internet. I experimentet studeras såväl etnisk diskriminering som könsdiskriminering genom att tre fiktiva personer, en med ett typiskt svenskt manligt namn, en med ett typiskt svensk kvinnligt namn samt en med ett typiskt arabiskt/muslimskt manligt namn söker hyresrättslägenheter vilka utannonserats som lediga av såväl privatpersoner som företag på Blocket. se. Våra resultat visar att den arabiske/muslimske mannen möter diskriminering när han söker lägenheter. Den arabisk/muslimske mannen fick långt färre positiva svar och erbjudanden till visningar av lägenheter än den svenske mannen. Vi finner också en könsdiskriminering på bostadsmarknaden där den svenska kvinnan fick fler positiva svar och visningserbjudanden än den svenske mannen.

  • 1157.
    Ahmed, Ali
    et al.
    Växjö universitet.
    Hammarstedt, Mats
    Växjö universitet.
    Ekonomiska perspektiv på etnisk diskriminering2010Book (Other academic)
  • 1158.
    Ahmed, Ali
    et al.
    Växjö University, Sweden .
    Hammarstedt, Mats
    Växjö University, Sweden .
    Sexual orientation and earnings: a register data-based approach to identify homosexuals2010In: Journal of Population Economics, ISSN 0933-1433, E-ISSN 1432-1475, Vol. 23, no 3, p. 835-849Article in journal (Refereed)
    Abstract [en]

    This paper examines earnings differentials between homo- and heterosexual individuals by identifying sexual orientation with the help of information from register data. Register data enable us to avoid the misclassifications of sexual orientation often mentioned as a potential bias in survey-based studies. The results show that gay men are at an earnings disadvantage as compared to male heterosexuals while the earnings differential between lesbians and heterosexual women is very small. Our results are in line with results from previous research but are more reliable since we use a more reliable measure of sexual orientation than previous research.

  • 1159.
    Ahmed, Ali
    et al.
    Linnaeus University, Växjö, Sweden and Swedish Collegium for Advanced Study, Uppsala, Sweden.
    Hammarstedt, Mats
    Linnaeus University, Växjö, Sweden.
    The effect of subtle religious representations on cooperation2011In: International Journal of Social Economics, ISSN 0306-8293, E-ISSN 1758-6712, Vol. 38, no 11, p. 900-910Article in journal (Refereed)
    Abstract [en]

    Purpose – The purpose of this paper is to investigate how subtle religious representations affect prosocial behavior. The authors study the impact of religious representations on prosocial behavior in terms of cooperation in a one-shot/three-person public goods game.

    Design/methodology/approach – The authors used the scrambled sentence task to prime participants with religious words before they were asked to make a one-shot/three-person public goods game decision.

    Findings – Both in the raw data and when controlling for factors such as age, gender and religious beliefs, the authors found that priming of religious representations increased cooperation in the experiment, that is, increased contributions to the public good. The authors found no significant interaction effects between priming and self-reported measures of religiosity, suggesting that the priming effect was present among both self-reported religious and nonreligious participants. Self-reported measures of religiosity were not correlated with cooperation in this study.

    Originality/value – The paper adds to the growing body of experimental economics literature that has studied self-reported measures of religiosity alongside behavior in different economic games. This study contributes to the literature by examining the effect of subtle influences of religion on cooperation. Also, in contrast to previous economic literature, the paper examines the direct impact of religion as an independent variable on cooperation.

  • 1160.
    Ahmed, Ali
    et al.
    Linköping University, Department of Management and Engineering, Economics. Linköping University, Faculty of Arts and Sciences.
    Lång, Elisabeth
    Linköping University, Department of Management and Engineering, Economics. Linköping University, Faculty of Arts and Sciences. Swedish Def Res Agcy FOI, Sweden.
    Victimized Twice: A Field Experiment on the Employability of Victims2019In: Victims & Offenders, ISSN 1556-4886, E-ISSN 1556-4991Article in journal (Refereed)
    Abstract [en]

    Do employers discriminate against victims? We address this question and present the findings of a field experiment on hiring discrimination against victims. Matched pairs of written job applications for fictitious victims and nonvictims were sent to 1,117 employers in various labor market sectors. The probability of receiving a job interview invite or a job offer from employers was then estimated. Differences in this probability between the victim and nonvictim applicants were interpreted as discrimination. Results show that victims had a significantly lower probability of receiving a job interview invite or a job offer from employers than nonvictims. The extent of discrimination varied with applicants sex and occupational characteristics.

  • 1161.
    Ahmed, Ali M.
    Centre for Labour Market Policy Research, Växjö University, Sweden.
    Can education affect pro-social behavior?: Cops, economists and humanists in social dilemmas2008In: International Journal of Social Economics, ISSN 0306-8293, E-ISSN 1758-6712, Vol. 35, no 4, p. 298-307Article in journal (Refereed)
    Abstract [en]

    Purpose – The purpose of this paper is to examine whether education and training affect pro-social behavior. Economics students are often accused of being less pro-social. The explanations given are that less pro-social people choose to study economics or that economics studies indoctrinate students to selfish behavior. The paper experimentally tests these postulations.

    Design/methodology/approach – The paper uses the prisoner's dilemma game and stag hunt game to study cooperation across different groups of students.

    Findings – The experiment supports neither of the postulations: economics students would be indoctrinated or less pro-social people choose to study economics. However, the study shows that police cadets, who go through an education where teamwork and cooperation is promoted, become more cooperative and pro-social after their completed education.

    Originality/value – In contrast to earlier studies, this paper does not simply study economics students, but also examines if students in educational programs that promote loyalty and cooperation and encourage teamwork are more pro-social than other students.

  • 1162.
    Ahmed, Ali M.
    School of Management and Economics, Växjö University, Sweden.
    Decisions under unpredictable losses: An examination of the restated diversification principle2007In: Judgment and decision making, ISSN 1930-2975, E-ISSN 1930-2975, Vol. 2, no 5, p. 312-316Article in journal (Refereed)
    Abstract [en]

    An experimental test of the descriptive adequacy of the restated diversification principle is presented. The principle postulates that risk-averse utility maximizers will pool risks for their mutual benefit, even if information is missing about the probabilities of losses. It is enough for people to assume that they face equal risks when they pool risks. The results of the experiment support the principle.

  • 1163.
    Ahmed, Ali M.
    Centre for Labour Market Policy Research (CAFO), Växjö University, Sweden.
    Group identity, social distance and intergroup bias2007In: Journal of Economic Psychology, ISSN 0167-4870, E-ISSN 1872-7719, Vol. 28, no 3, p. 324-337Article in journal (Refereed)
    Abstract [en]

    This paper studies how groupidentity, socialdistance and intergroupbias may affect economic decision-making. Two types of experimental groupings are created, and subjects are then paired with either an in-group member or an out-group member in a number of two-person games. The result of this experiment shows that out-group members face a risk of being discriminated against. The cause of the discrimination is not hostility toward out-group members; the discrimination is triggered because of higher expectations or favoritism of in-group members. This type of behavior holds, regardless of the grouping procedure.

  • 1164.
    Ahmed, Ali M.
    et al.
    Department of Economics, University of Gothenburg, Sweden.
    Andersson, Lina
    School of Management and Economics, Växjö University, Sweden.
    Hammarstedt, Mats
    School of Management and Economics, Växjö University, Sweden.
    Are lesbians discriminated against in the rental housing market? Evidence from a correspondence testing experiment2008In: Journal of Housing Economics, ISSN 1051-1377, E-ISSN 1096-0791, Vol. 17, no 3, p. 234-238Article in journal (Refereed)
    Abstract [en]

    This paper presents a field experiment, conducted over the Internet, studying possible discrimination againstlesbians in the rentalhousing market in Sweden. We let two fictitious couples, one heterosexual and one lesbian, apply for vacant rental apartments advertised by landlords on the Internet. We then investigated whether there were differences between the couples in the number of received call-backs, invitations to further contact, and invitations to immediate showings. Our findings show no indication of differential treatment of lesbians by landlords. A discussion relating to earlier findings is provided

  • 1165.
    Ahmed, Ali M.
    et al.
    Department of Economics, University of Gothenburg, Sweden.
    Hammarstedt, Mats
    Centre for Labour Market Policy Research, Växjö University, Sweden.
    Discrimination in the rental housing market: a field experiment on the Internet2008In: Journal of Urban Economics, ISSN 0094-1190, E-ISSN 1095-9068, Vol. 64, no 2, p. 362-372Article in journal (Refereed)
    Abstract [en]

    This paper presents afieldexperiment on discrimination in the housing market, using the Internet as a research platform. The procedure involved our creating three fictitious persons with distinctive sounding ethnic and gender names. These individuals applied for vacant rental apartments in Sweden that were advertised by landlords on the Internet. Our findings show that the Arabic/Muslim male received far fewer call backs, enquiries, and showings than the Swedish male. Our observations also indicate that the Swedish female met with less difficulty in terms of finding an apartment than the Swedish male. Thus, based on our findings, we conclude that ethnic, as well as gender discrimination exists in the Swedish rentalhousing market.

  • 1166.
    Ahmed, Ali M.
    et al.
    Linköping University, Department of Management and Engineering, Economics. Linköping University, Faculty of Arts and Sciences.
    Lång, Elisabeth
    Linköping University, Department of Management and Engineering, Economics. Linköping University, Faculty of Arts and Sciences.
    The employability of ex-offenders: a field experiment in the Swedish labor market2017In: IZA Journal of Labor Policy, ISSN 2193-9004, E-ISSN 2193-9004, Vol. 6, no 1, p. 1-23Article in journal (Refereed)
    Abstract [en]

    This paper presents the findings of a field experiment on hiring discrimination against ex-offenders in the Swedish labor market. Matched pairs of written job applications for fictitious male and female applicants with and without a past conviction of assault were sent to employers for nine different occupations. Results show that discrimination against ex-offenders exists, but the extent of it varies across occupations. The past conviction of assault was associated with 7–18 percentage point lower probability of receiving a positive employer response. Discrimination against ex-offenders was pronounced in female-dominated and high-skilled occupations. The magnitude of discrimination against ex-offenders did not vary by applicants’ sex.

  • 1167.
    Ahmed, Ali M.
    et al.
    University of Gothenburg and Växjö University, Sweden.
    Salas, Osvaldo
    University of Gothenburg and Växjö University, Sweden.
    Trust in India and Sweden: an experimental examination of the Fukuyama conjecture2008In: Cross-cultural research, ISSN 1069-3971, E-ISSN 1552-3578, Vol. 42, no 4, p. 420-429Article in journal (Refereed)
    Abstract [en]

    The authors test the proposition, put forward by Francis Fukuyama, that the higher the level of trust in a country the less corrupt, the more developed, and wealthier its economy will be. They study trust and voluntary cooperation using a one-shot and three-person public goods game experiment in India and Sweden. The results, in line with the proposition, show that the average contribution is significantly larger in Sweden, implying a higher level of trust and cooperation in Sweden than in India. This article provides further evidence on the relationship between trust and economic development. This study differs from previous ones in that it uses a multilateral game experiment to study trust and cooperation rather than a bilateral game experiment. Furthermore, it provides evidence from two countries not studied before in this context.

  • 1168.
    Ahmed, Ali M.
    et al.
    Centre for Labour Market Policy Research (CAFO), School of Management and Economics, Växjö University Sweden.
    Skogh, Göran
    Linköping University, Department of Management and Engineering, Economics. Linköping University, Faculty of Arts and Sciences.
    Choices at various levels of uncertainty: An experimental test of the restated diversification theorem2006In: Journal of Risk and Uncertainty, ISSN 0895-5646, E-ISSN 1573-0476, Vol. 33, no 3, p. 183-196Article in journal (Refereed)
    Abstract [en]

    Our "Restated diversification theorem" (Skogh and Wu, 2005) says that risk-averse agents may pool risks efficiently without assignment of subjective probabilities to outcomes, also at genuine uncertainty. It suffices that the agents presume that they face equal risks. Here, the theorem is tested in an experiment where the probability of loss, and the information about this probability, varies. The result supports our theorem. Moreover, it tentatively supports an evolutionary theory of the insurance industry-starting with mutual pooling at uncertainty, turning into insurance priced ex ante when actuarial information is available. © Springer Science + Business Media, LLC 2006.

  • 1169.
    Ahmed Ali, Muna
    Linköping University, Department of Social and Welfare Studies.
    Upplevelser i somaliska och svenska skolor: En kvalitativ studie om somaliska ensamkommandepojkars bemötande samt upplevelser och mål i svenska och somaliska skolor2018Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
  • 1170.
    Ahmed, Ali
    et al.
    Växjö University, Sweden.
    Salas, Osvaldo
    Göteborg University and Växjö University, Sweden.
    Cooperación y confianza: análisis comparativo en economía experimental2007In: Revista CIFE, ISSN 0124-3551, Vol. 12, no 9, p. 9-23Article in journal (Other academic)
    Abstract [en]

    In this work using an experiment of game of public goods analyzes the relation between the attitudinal trust and behavioral trust in three countries. Students from Colombia, Mexico and Sweden participate in this experiment and respond a questionnaire with questions on confidence. The attitudinal trust and behavioral trust are different substantially between the analyzed countries. The confidence measured by the questions of the questionnaire does not show a pattern of common conduct between the participants of the three countries. Nevertheless, a somewhat similar behavior we found in the applied experiment, that is to say, the participants assume a certain level of risk very similarity, however, cultures and different societies come from.

  • 1171.
    Ahmed, Ali
    et al.
    Linnaeus University, Växjö, Sweden.
    Salas, Osvaldo
    University of Gothenburg, Sweden.
    Implicit influences of Christian religious representations on dictator and prisoner’s dilemma game decisions2011In: The Journal of Socio-Economics, ISSN 1053-5357, E-ISSN 1879-1239, Vol. 40, no 3, p. 242-246Article in journal (Refereed)
    Abstract [en]

    We investigate how implicit influences of Christian religious representations affect prosociality. We examine the direct impact of religion as an independent variable on prosocial behavior. We do so by priming participants with religious words in a scrambled sentence task before they make a dictator game and a prisoner's dilemma game decision. Priming religious words significantly increased prosocial behavior in both games: participants in the treatment group were more generous and cooperative than participants in the control group. The priming effect was present regardless of participants’ self-reported religiosity. Self-reported religiosity was not correlated with generosity or cooperation.

  • 1172.
    Ahmed, Ali
    et al.
    University of Gothenburg and Växjö University.
    Salas, Osvaldo
    University of Gothenburg and Växjö University.
    Is the hand of God involved in human cooperation?2009In: International Journal of Social Economics, ISSN 0306-8293, E-ISSN 1758-6712, Vol. 36, no 1/2, p. 70-80Article in journal (Refereed)
    Abstract [en]

    Purpose – The purpose of this paper is to examine the supernatural punishment theory. The theory postulates that religion increases cooperation because religious people fear the retributions that may follow if they do not follow the rules and norms provided by the religion.

    Design/methodology/approach – The paper reports results for a public goods experiment conducted in India, Mexico, and Sweden. By asking participants whether they are religious or not, one can study whether religiosity has an effect on voluntary cooperation in the public goods game.

    Findings – No significant behavioral differences were found between religious and nonreligious participants in the experiment.

    Originality/value – This paper differs from the previous limited experimental literature, studying religiosity and cooperation, in the sense that it uses a public goods game rather than a prisoner's dilemma game. The public goods game is more interesting since many real life problems are multilateral rather than bilateral. Further, the study was conducted in three different countries: India, Mexico, and Sweden; with three different types of potentialy religious people: Hindus, Catholics, and Protestants.

  • 1173.
    Ahmed, Ali
    et al.
    Linköping University, Department of Management and Engineering, Economics. Linköping University, Faculty of Arts and Sciences.
    Salas, Osvaldo
    School of Public Administration, University of Gothenburg, Sweden.
    Religious context and prosociality: an experimental study from Valparaíso, Chile2013In: Journal for the Scientific Study of Religion, ISSN 0021-8294, E-ISSN 1468-5906, Vol. 52, no 3, p. 627-637Article in journal (Refereed)
    Abstract [en]

    Are people more prosocial in a religious context? We addressed this question through an experiment. We randomly placed participants in the control group in a neutral location (a lecture hall), and we placed participants in the experimental group in a religious location (a chapel). The participants then took part in a one-shot three-person public goods game, which measured participants' degree of cooperativeness. The results showed that participants in the experimental group cooperated significantly more than did participants in the control group. Furthermore, participants' beliefs about other participants' cooperativeness were more positive in the experimental group than they were in the control group. Improved expectations of others partially explained the enhanced cooperation in the religious context. We found no main or interaction effect of self-reported religiosity in the experiment.

  • 1174.
    Ahmed, Ali
    et al.
    Växjö University, Sweden.
    Salas, Osvaldo
    Göteborg University, Sweden.
    The relationship between behavioral and attitudinal trust: a cross-cultural study2009In: Review of social economy, ISSN 0034-6764, E-ISSN 1470-1162, Vol. 67, no 4, p. 457-482Article in journal (Refereed)
    Abstract [en]

    We study the relationship between trust in an experiment and trust measured by means of popular survey items in different countries. Students from Chile, Colombia, India, Mexico and Sweden participate in a public goods game experiment and answer a set of standard attitudinal survey questions about trust. We find that behavioral trust and attitudinal trust significantly differ among countries. Behavioral trust is highest in Sweden, followed by Latin America, and lowest in India. Attitudinal trust is highest in Chile and Sweden, followed by India and Mexico, and lowest in Colombia. Further, the predictive power of survey items also differs among countries. Trust measured by survey items is significantly related to behavioral trust in some but not in all societies. No single survey item predicts actual trust across all countries. Plausible explanations of the inconsistent relationship between behavioral and attitudinal trust across countries are discussed.

  • 1175.
    Ahmed, Ali
    et al.
    Linköping University, Department of Management and Engineering, Economics. Linköping University, Faculty of Arts and Sciences.
    Uddin, Gazi Salah
    Linköping University, Department of Management and Engineering, Economics. Linköping University, Faculty of Arts and Sciences.
    Sohag, Kazi
    Institute of Climate Change, Universiti Kebangsaan, Malaysia.
    Biomass energy, technological progress and the environmental Kuznets curve: Evidence from selected European countries2016In: Biomass and Bioenergy, ISSN 0961-9534, E-ISSN 1873-2909, Vol. 90, p. 202-208Article in journal (Refereed)
    Abstract [en]

    We examine the causal relationship between economic growth and CO2 emissions in a panel of 24 European countries from 1980 to 2010. Using an analytical framework that considers pooled mean group estimations in a dynamic heterogeneous panel setting, we show that there is an inverted U-shaped relationship between CO2 emissions and economic growth in the long run and that there is no such relationship in the short run. In particular, we find that biomass energy is insignificantly linked to CO2 emission. However, technological innovation significantly facilitates reduction of CO2 emissions in the investigated countries. Altogether, our study implies that economic growth and environmental quality can be achieved simultaneously, which opens up new insights for policy-makers for sustainable economic development via implementation of renewable energy consumption through technological innovation.

  • 1176.
    Ahmed, Atheeq
    Linköping University, Department of Electrical Engineering, Communication Systems.
    Human Detection Using Ultra Wideband Radar and Continuous Wave Radar2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    A radar works by radiating electromagnetic energy and detecting the reflected signal returned from the target. The nature of the reflected signal provides information about the target’s distance or speed. In this thesis, we will be using a UWB radar and a CW radar to help detect the presence and rough location of trapped survivors by detecting their motions. Range is estimated in the UWB radar using clutter removal with SVD and for the dual frequency CW Radar using STFT and median filtering. The effect of the algorithm parameters on their performance was analyzed. The performance of the implemented algorithms with regards to small motion detection, distance estimation and penetration capability was analyzed. Both systems are certainly capable of human detection and tracking.

  • 1177.
    Ahmed, Hamad
    et al.
    Queen's University Belfast, UK.
    Dieckmann, Mark Eric
    Queen's University Belfast, UK.
    Romagnani, Lorenzo
    Ecole Polytechnique, Palaiseau, France.
    Doria, Domenico
    Queen's University Belfast, UK.
    Sarri, Gianluca
    Queen's University Belfast.
    Cherchez, Mirelie
    University of Düsseldorf, Germany.
    Ianni, E.
    Universita di Pisa, Italy.
    Kourakis, Ioannis
    Queen's University Belfast, UK.
    Giesecke, Anna Lena
    University of Düsseldorf, Germany.
    Notley, Margaret
    Rutherford Appleton Laboratory, Chilton, Oxfordshire, UK.
    Prasad, R.
    Queen's University Belfast, UK.
    Quinn, Kevin
    Queen's University Belfast, UK.
    Willi, Oswald
    University of Düsseldorf, Germany.
    Borghesi, Marco
    Queen's University Belfast, UK.
    Time-Resolved Characterization of the Formation of a Collisionless Shock2013In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 110, no 20Article in journal (Refereed)
    Abstract [en]

    We report on the temporally and spatially resolved detection of the precursory stages that lead to the formation of an unmagnetized, supercritical collisionless shock in a laser-driven laboratory experiment. The measured evolution of the electrostatic potential associated with the shock unveils the transition from a current free double layer into a symmetric shock structure, stabilized by ion reflection at the shock front. Supported by a matching particle-in-cell simulation and theoretical considerations, we suggest that this process is analogous to ion reflection at supercritical collisionless shocks in supernova remnants.

  • 1178.
    Ahmed, Hamad
    et al.
    Centre for Plasma Physics, Queen’s University of Belfast, Belfast BT7 1NN, UK.
    Doria, Domenico
    Centre for Plasma Physics, Queen’s University of Belfast, Belfast BT7 1NN, UK.
    Dieckmann, Mark Eric
    Linköping University, Department of Science and Technology, Media and Information Technology. Linköping University, Faculty of Science & Engineering.
    Sarri, Gianluca
    Centre for Plasma Physics, Queen’s University of Belfast, Belfast BT7 1NN, UK.
    Romagnani, Lorenzo
    LULI, École Polytechnique, CNRS, CEA, UPMC, Palaiseau, France.
    Bret, Antoine
    ETSI Industriales, Universidad Castilla La Mancha, E-13 071 Ciudad Real, Spain.
    Cerchez, M
    Institute for Laser and Plasma Physics, University of Düsseldorf, Germany.
    Giesecke, AL
    Institute for Laser and Plasma Physics, University of Düsseldorf, Germany.
    Ianni, E
    Centre for Plasma Physics, Queen’s University of Belfast, Belfast BT7 1NN, UK.
    Kar, Satya
    Centre for Plasma Physics, Queen’s University of Belfast, Belfast BT7 1NN, UK.
    Notley, Margaret
    Central Laser Facility, Rutherford Appleton Laboratory, Chilton, Oxfordshire OX11 0QX, UK.
    Prasad, R
    Centre for Plasma Physics, Queen’s University of Belfast, Belfast BT7 1NN, UK.
    Quinn, Kevin
    Centre for Plasma Physics, Queen’s University of Belfast, Belfast BT7 1NN, UK.
    Willi, Oswald
    Institute for Laser and Plasma Physics, University of Düsseldorf, Germany.
    Borghesi, Marco
    Centre for Plasma Physics, Queen’s University of Belfast, Belfast BT7 1NN, UK.
    Experimental Observation of Thin-shell Instability in a Collisionless Plasma2017In: Astrophysical Journal Letters, ISSN 2041-8205, E-ISSN 2041-8213, Vol. 834, no 2, article id L21Article in journal (Refereed)
    Abstract [en]

    We report on the experimental observation of the instability of a plasma shell, which formed during the expansion of a laser-ablated plasma into a rarefied ambient medium. By means of a proton radiography technique, the evolution of the instability is temporally and spatially resolved on a timescale much shorter than the hydrodynamic one. The density of the thin shell exceeds that of the surrounding plasma, which lets electrons diffuse outward. An ambipolar electric field grows on both sides of the thin shell that is antiparallel to the density gradient. Ripples in the thin shell result in a spatially varying balance between the thermal pressure force mediated by this field and the ram pressure force that is exerted on it by the inflowing plasma. This mismatch amplifies the ripples by the same mechanism that drives the hydrodynamic nonlinear thin-shell instability (NTSI). Our results thus constitute the first experimental verification that the NTSI can develop in colliding flows.

  • 1179.
    Ahmed, Hameed
    et al.
    Linköping University, Department of Management and Economics.
    Najam, Ali
    Linköping University, Department of Management and Economics.
    How Corporate Governance Affects Strategy of Corporations: - Lessons from Enron Corporation -2006Independent thesis Advanced level (degree of Magister), 10 points / 15 hpStudent thesis
    Abstract [en]

    Corporate governance is a subject of academic and professional debate. It has and it will continue to be a topic under scrutiny for subsequent deliberations since there are many different research dimensions and contexts associated with it. However, it has been observed that the linkage between corporate governance and strategy of a corporation remains as an untapped area with considerable avenues of research. This paper tends to explore this linkage, using Enron scandal as backdrop.

    In the aftermath of the debacle of US energy giant Enron in 2001, the significance of corporate governance has come under heavy scrutiny of different researchers. Whereas different explanations have been attributed to its downfall, it has been widely accepted that this was a case of failed corporate governance.

    This paper tends to explore Enron downfall from the perspective of failed corporate governance. By defining and exploring corporate governance and its underlying issues, the authors have used Agency theory as a theoretical framework in unison with internationally renowned auditing company - Ernst & Young Model - to understand the role of different actors and forces responsible for Enron collapse.

    By using qualitative research method, the authors have used secondary literature as well as combination of questionnaires and telephonic interviews to obtain viewpoint of renowned international academic / professional researchers. They have been identified through convenience sampling methodology. A few internationally renowned auditing companies have also been used as part of this survey to explore diversity of perspectives in this context. Efforts have been made; to explore the main causes rather then to write just another case on Enron.

    After drawing lessons from Enron, the paper concludes with the understanding that there is direct link between corporate governance and strategy of corporations. However there is diversity of perspectives in this context and hence it requires further exploration and debate.

  • 1180.
    Ahmed, Hameed
    et al.
    Linköping University, Department of Management and Economics.
    Xiaohong, Ye
    Linköping University, Department of Management and Economics.
    The Role Scenarios of EU in the World of 2020: a Comparative Perspective Between European and US based Think Tanks.2005Independent thesis Advanced level (degree of Magister)Student thesis
    Abstract [en]

    This paper aims to tell out a “what next” question of the future scenarios that the European Union (EU), as a security community, is most likely to face in its development as a world power up to the year 2020. The EU is a rapidly evolving concept consolidating with comprehensive internal and external dimension and implication. Key concepts such as power, security, global governance and international order have been used as the underlying themes that will determine the course of the future. In this context Neo-realism, Constructivism and Security Community’s model have been used as the theoretical framework to examine how EU’s role in the international system can be analyzed in the conceptual framework of security. This is followed by a discussion on the concurrent ESDP instruments initiated by the new Constitution as a key momentum of security community buildup internally. To broaden understanding and to get a variety of perspectives, research reports and policy papers of some transatlantic think tanks were analyzed. While multi- perspectives of some prominent think tanks were reviewed, analyzed and discussed, the opinions of policy makers at the United Nations Head Quarters, New York, were also explored to reflect on how EU’s role in international affairs is being perceived in the corridors of power, both concurrently and futuristically. These views were consequently augmented by attending General Assembly and Security Council sessions during September 2004 to January 2005 to observe what sorts of power and influence EU exerts in the contemporary international system and what potential it has for the future. Based on these findings, the paper identified three scenarios that EU is most likely to face in its efforts to be an international power. The paper concluded with the understanding that EU has vision and potential to be a power in the international system futuristically, which can be further enhanced if EU enhances its military capabilities and improves its power perception in the eyes of various stakeholders. However since the international system is volatile, its future role cannot be predicted with accuracy, only alternative options can be identified. EU’s roles are dependent upon the degree of success of the integration process internally and the structural interaction with other major actors in the international system. Whereas EU may enhance its role up to the year 2020, it may not enter into a power conflict with other major powers. However it will play its role comparable with the magnitude of its size, power and influence to manage the international system, futuristically in an improvised way.

  • 1181.
    Ahmed, Ijaz
    et al.
    Centre for Wireless Communications, University of Oulu, Finland; VTT Technical Research Centre of Finland.
    Shahabuddin, Shahriar
    Centre for Wireless Communications, University of Oulu, Finland; Nokia, Oulu, Finland.
    Tanesh, Kumar
    Centre for Wireless Communications, University of Oulu, Finland.
    Okwuibe, Jude
    Centre for Wireless Communications, University of Oulu, Finland.
    Gurtov, Andrei
    Linköping University, Department of Computer and Information Science, Database and information techniques. Linköping University, Faculty of Science & Engineering.
    Ylianttila, Mika
    Centre for Wireless Communications, University of Oulu, Finland.
    Security for 5G and Beyond2019In: IEEE Communications Surveys and Tutorials, ISSN 1553-877X, E-ISSN 1553-877XArticle in journal (Refereed)
    Abstract [en]

    The development of the Fifth Generation (5G) wireless networks is gaining momentum to connect almost all aspects of life through the network with much higher speed, very low latency and ubiquitous connectivity. Due to its crucial role in our lives, the network must secure its users, components, and services. The security threat landscape of 5G has grown enormously due to the unprecedented increase in types of services and in the number of devices. Therefore, security solutions if not developed yet must be envisioned already to cope with diverse threats on various services, novel technologies, and increased user information accessible by the network. This article outlines the 5G network threat landscape, the security vulnerabilities in the new technological concepts that will be adopted by 5G, and provides either solutions to those threats or future directions to cope with those security challenges. We also provide a brief outline of the post-5G cellular technologies and their security vulnerabilities which is referred to as Future Generations (XG) in this paper. In brief, this article highlights the present and future security challenges in wireless networks, mainly in 5G, and future directions to secure wireless networks beyond 5G.

  • 1182.
    Ahmed, Mohsin Niaz
    Linköping University, Department of Electrical Engineering, Computer Engineering.
    LTE Uplink Modeling and Channel Estimation2011Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This master thesis investigates the uplink transmition from User Equipment (UE) to base station in LET (Long Term Evolution) and channel estimation using pilot symbols with parameter defined in 3GPP (3rd Generation Partnership Project) specifications. The purpose of the thesis was to implement a simulator which can generate uplink signal as it is generated by UE. The Third Generation (3G) mobile system was given the name LTE. This thesis focus on the uplink of LTE where single carrier frequency division multiple access (SC-FDMA) is utilized as a multiple access technique. The advantage over the orthogonal frequency division multiple access (OFDMA), which is used in downlink is to get better peak power characteristics. Because in uplink communication better peak power characteristic is necessary for better power efficiency in mobile terminals. To access the performance of uplink transmition realistic channel model for wireless communication system is essential. Channel models used are proposed by International Telecommunication Union (ITU) and the correct knowledge of these models is important for testing, optimization and performance improvements of signal processing algorithms. The channel estimation techniques used are Least Square (LS) and Least Minimum Mean Square Error (LMMSE) for different channel models. Performance of these algorithms has been measured in term of Bit Error Rate (BER) and Signal to Noise Ratio (SNR).

  • 1183.
    Ahmed, Rafiq
    Linköping University, The Tema Institute, Department of Water and Environmental Studies.
    Seasonal Variation of Inorganic Nutrients (DSi, DIN and DIP) Concentration in Swedish River2007Independent thesis Advanced level (degree of Magister), 20 points / 30 hpStudent thesis
    Abstract [en]

    Rivers have been playing most important role as fresh water source and medium of nutrient transportation from terrestrial to aquatic ecosystem. Inorganic form of nutrients (DSi, DIN and DIP) are plant available mostly control the productivity of aquatic ecosystem. Transfer of these nutrients in higher concentrations cause harmful eutrophication in receiving water body.

    Study of dissolved inorganic nutrients concentrations in 12 Swedish rivers of different basin characteristics demonstrated both similar and varying behaviour from river to river and from season to season depending on catchment hydrology; land use and geology. Highest concentration did not coincide with the highest runoff. High DSi concentration observed in the unperturbed rivers however, high DIN and DIP concentration observed in agriculture dominated river followed by river basin dominated by industrial and urban activities. DSi and DIN concentration observed high in winter and decreased through spring to reach lowest in summer. DIP concentration although found low in summer but high concentration observed in early spring and early autumn. Rivers with low average runoff positively correlated with DSi and DIN concentration however, DIP demonstrated weak correlation.

  • 1184.
    Ahmed, Shohana
    et al.
    Linköping University, Department of Management and Engineering.
    Kamruzzaman, Mohammad
    Linköping University, Department of Management and Engineering.
    Drivers of eco-innovation2010Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Contemporary business world is now facing a challenge, a shift from traditional innovation to eco-innovation. Organizations need to recognize the importance of environment in any aspect of innovation. This paper aims to deduce the drivers of eco-innovation from the overview of existing literature and empirical study to provide an understanding of the organization aiming towards eco-innovation.

    The aim of this thesis is to identify the drivers of eco-innovation and objectives being able to understand and review the contribution of innovation and eco-innovation as separate entities.This research is limited to the investigation of drivers of eco-innovation in one single organization i.e. Tekniska Verken, Linköping. Conceptual model of drivers of eco-innovation is created from previous research and verified through empirical study. The model of this research is to outline the three categories of drivers within the limit and scope of this analysis. However modification of the model on the basis of additional drivers has been duly appreciated and elucidated to reflect reality of the research.

  • 1185.
    Ahmed, Tamer A. E.
    et al.
    University of Ottawa, Ontario, Canada.
    Giulivi, Antonio
    The Ottawa Hospital, Ontario, Canada.
    Griffith, May
    University of Ottawa, Ontario, Canada.
    Hincke, Max
    University of Ottawa, Ontario, Canada.
    Fibrin Glues in Combination with Mesenchymal Stem Cells to Develop a Tissue-Engineered Cartilage Substitute2011In: Tissue Engineering. Parts A, B and C, ISSN 2152-4947, E-ISSN 2152-4955, Vol. 17, no 3-4, p. 323-335Article in journal (Refereed)
    Abstract [en]

     Damage of cartilage due to traumatic or pathological conditions results in disability and severe pain. Regenerative medicine, using tissue engineering-based constructs to enhance cartilage repair by mobilizing chondrogenic cells, is a promising approach for restoration of structure and function. Fresh fibrin (FG) and platelet-rich fibrin (PR-FG) glues produced by the CryoSeal (R) FS System, in combination with human bone marrow-derived mesenchymal stem cells (BM-hMSCs), were evaluated in this study. We additionally tested the incorporation of heparin-based delivery system (HBDS) into these scaffolds to immobilize endogenous growth factors as well as exogenous transforming growth factor-beta(2). Strongly, CD90+ and CD105+ hMSCs were encapsulated into FG and PR-FG with and without HBDS. Encapsulation of hMSCs in PR-FG led to increased expression of collagen II gene at 2.5 weeks; however, no difference was observed between FG and PR-FG at 5 weeks. The incorporation of HBDS prevented the enhancement of collagen II gene expression. BM-hMSCs in FG initially displayed enhanced aggrecan gene expression and increased accumulation of Alcian blue-positive extracellular matrix; incorporation of HBDS into these glues did not improve aggrecan gene expression and extracellular matrix accumulation. The most significant effect on cartilage marker gene expression and accumulation was observed after encapsulation of hMSCs in FG. We conclude that FG is more promising than PR-FG as a scaffold for chondrogenic differentiation of hMSCs; however, immobilization of growth factors inside these fibrin scaffolds with the HBDS system has a negative impact on this process. In addition, BM-hMSCs are valid and potentially superior alternatives to chondrocytes for tissue engineering of articular cartilage.

  • 1186.
    Ahmed, Tamer A. E.
    et al.
    Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, Ontario, Canada.
    Griffith, May
    Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, Ontario, Canada.
    Hincke, Max
    Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, Ontario, Canada.
    Characterization and inhibition of fibrin hydrogel-degrading enzymes during development of tissue engineering scaffolds2007In: Tissue engineering, ISSN 1076-3279, E-ISSN 1557-8690, Vol. 13, no 7, p. 1469-1477Article in journal (Refereed)
    Abstract [en]

    The goal of articular cartilage tissue engineering is to provide cartilaginous constructs to replace abnormal cartilage. We have evaluated the chondroprogenitor clonal cell line RCJ3.1C5.18 (C5.18) as a model to guide the development of appropriate scaffolds for tissue engineering. Rapid degradation of fibrin hydrogels was observed after encapsulation of C5.18 cells. The enzymes responsible for this fibrin gel breakdown were characterized to control their activity and regulate gel stability. Western blotting, confirming zymography, revealed bands due to matrix metalloproteinases (MMP-2, MMP-3) that are secreted concomitantly with fibrin hydrogels breakdown. High plasmin activity was detected in conditioned media during hydrogel breakdown but not in the confluent cells before encapsulation. Reverse transcriptase polymerase chain reaction indicated the expression of MMP-2, -3, and -9 and plasminogen in the cells. MMP-9 was 100 times higher at day 1, whereas MMP-2 started to increase and reached its maximum level by day 7. Aprotinin, a known serine protease inhibitor, and galardin (GM6001), a potent MMP inhibitor, in combination or separately, prevented the breakdown of fibrin-C5.18 hydrogels, whereas only the combination of both promoted the accumulation of extracellular matrix. These findings suggest that plasmin and MMPs contribute independently to fibrin hydrogel breakdown, but that either enzyme can achieve extracellular matrix breakdown.

  • 1187.
    Ahmed, Tanvir
    Linköping University, Department of Electrical Engineering, Electronics System.
    High Level Model of IEEE 802.15.3c Standard and Implementation of a Suitable FFT on ASIC2011Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    A high level model of HSIPHY mode of IEEE 802.15.3c standard has been constructedin Matlab to optimize the wordlength to achieve a specific bit error rate (BER) depending on the application, and later an FFT has been implemented for different wordlengths depending on the applications. The hardware cost and power is proportional to wordlength. However, the main objective of this thesis has been to implement a low power, low area cost FFT for this standard. For that the whole system has been modeled in Matlab and the signal to noise ratio (SNR) and wordlength of the system have been studied to achieve an acceptable BER. Later an FFT has been implemented on 65nm ASIC for a wordlength of 8, 12 and 16 bits. For the implementation, a Radix-8 algorithm with eight parallel samples has been adopted. That reduce the area and the power consumption significantly compared to other algorithms and architectures. Moreover, a simple control has been used for this implementation. Voltage scaling has been done to reduce thepower. The EDA synthesis result shows that for 16bit wordlength, the FFT has 2.64 GS/s throughput, it takes 1.439 mm2 area on the chip and consume 61.51mW power.

  • 1188.
    Ahmed, Tanvir
    et al.
    Linköping University, Department of Electrical Engineering. Linköping University, Faculty of Science & Engineering.
    Garrido, Mario
    Linköping University, Department of Electrical Engineering, Electronics System. Linköping University, The Institute of Technology.
    Gustafsson, Oscar
    Linköping University, Department of Electrical Engineering, Electronics System. Linköping University, The Institute of Technology.
    A 512-point 8-parallel pipelined feedforward FFT for WPAN2011In: 2011 Conference Record of the Forty Fifth Asilomar Conference on Signals, Systems and Computers (ASILOMAR), IEEE , 2011, p. 981-984Conference paper (Refereed)
    Abstract [en]

    This paper presents a 512-point feedforward FFT architecture for wireless personal area network (WPAN). The architecture processes a continuous flow of 8 samples in parallel, leading to a throughput of 2.64 GSamples/s. The FFT is computed in three stages that use radix-8 butterflies. This radix reduces significantly the number of rotators with respect to previous approaches based on radix-2. Besides, the proposed architecture uses the minimum memory that is required for a 512-point 8-parallel FFT. Experimental results show that besides its high throughput, the design is efficient in area and power consumption, improving the results of previous approaches. Specifically, for a wordlength of 16 bits, the proposed design consumes 61.5 mW and its area is 1.43 mm2.

  • 1189.
    Ahmed, Uday
    et al.
    Linköping University, Department of Management and Engineering, Manufacturing Engineering. Linköping University, Faculty of Science & Engineering.
    Ayo, Priscilla
    Linköping University, Department of Management and Engineering, Manufacturing Engineering. Linköping University, Faculty of Arts and Sciences.
    Developing Common Questions about Integrated Product Service Engineering (IPSE), Ecodesign and Engineering Education2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In the recent years, more and more manufacturing firms recognize the benefit of providing products together with related services with an aim to gain higher profits as compared to supplying products without additional services. On the other hand, the competition in the global markets has been increased dramatically through increased sales of services in order to gain additional value for their products. In addition, several environmental challenges such as climate change, pollution, global warming impact, greenhouse gases emissions have played a vital role by influencing on the production protocols and trend of the companies. These challenges forced manufacturing countries to take into consideration environmentally conscious approach to their design thinking and industrial production processes. As a result, it became an important drive for manufacturing industries to shift from traditional product-oriented to service-oriented business models that has been witnessed during the last few years.

     

    The objective of this study research is to develop common questions that capture fundamental and common issues about Integrated Product Service Engineering (IPSE), Design for Environment (DFE) and Engineering education are effectives for industries to check and develop their knowledge, because the Engineering education plays a necessary role in associating socio-ethical knowledge with scientific and technological advances. The strategy taken to conduct this thesis task was first to study and understand the concept of Product Service System (PSS), IPSE, and Ecodesign as well as Engineering Education. Informative knowledge on these concepts were collected by reviewing several related journal articles, CIRP IPS2 conference proceedings.

     

    In this thesis the concepts of PSS, IPSE, DFE and Engineering Education discussed to develop the key common questions and issues to address the environmental, economic and social problems. Since PSS aims to reduce consumption through alternative schemes of product use as well as to increase overall resource productivity and dematerialization, but IPSE does not focus on a single factor but incorporates a wide range of factors such as environmental, social and economic issues. Whilst one of the main problems in this research focused on how to develop and strengthen the relationship between the academia and industry, and how this relation can be used to improve the academic performance and scientific research at universities and transfer them to industry.

     

    Sustainability and the life cycle concept have become a main solution for various problems such as a growing world population and a change in the industrial culture to come. As results Ecodesign and environmental considerations, financial aspects, product improvement as well as the commercial aspects were discussed in this project by understanding the previous concepts. The university considered as an important base of cultivating the talents, basic of inputs business organizations which help them to develop and improve their level of performance and quality of their products and services, and enhance its competitive position in the market. Changes in organized science further encouraged university interests in expanding technology transfer, because the scientific disciplines play an important role in influencing the type of interactions with industry as well as the University and Industry collaboration became the basic method of solving the problems to achieve (environmental, economic and social) sustainability.

  • 1190.
    Ahmed, Zubair
    Linköping University, Department of Electrical Engineering, Electronics System. Linköping University, The Institute of Technology.
    Design of Autonomous Low Power Sensor for Soil Moisture Measurement.2013Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Drought is the most severe disaster compared to other disasters in human civilization and their impacts are serious which can cause hungur, thrist, food shortages, loss of livestock directly effects the human life. The main objective of this project is to develop an early warning system (EWS) [3] for drought indices by using wireless sensor networks (WSNs) which is the only way forward for an on-site monitoring and validation of locally defined drought indices [3].The designed wireless sensor network (WSN) consisting of a sensor unit, a master unit and a sensor power management unit (PMU). The sensor unit measures the moisture of the soil and transmitt the measured data through ZigBee module to the master unit. A real time clock (RTC) is also used in the sensor unit which records the information of second, minute, hour, day, month of day and year about when or what time the measurement taken. The master unit consisting of a SD-card and Bluetooth module. SD-card is used to store measured data from other sensor units and it is possible to take out the reading of measured data from the master unit by accessing the SD-card via Bluetooth inside the master unit to a PC or a smartphone mobile.To manage the power in the sensor unit and to make sensor alive for several years, the power management unit (PMU) manages the power level between two energy storage buffers (i.e., a supercapacitor and a Li+ ion battery) for a sensor node.

  • 1191.
    Ahmetagic, Nermin
    Linköping University, Department of Medical and Health Sciences, Health and Society.
    The Dynamics of Health and Welfare: A Methodological Study Analysing the Two Phenomena in Five Populations During the Early 2000s2011Independent thesis Advanced level (degree of Master (Two Years)), 30 credits / 45 HE creditsStudent thesis
    Abstract [en]

    This paper aims to describe the dynamics of objective health and welfare in five populations, from the year 2000 to 2009, qua a methodological study. It proposes a three step approach to ensure the validity criteria in the conducted research process:

    1. firstly, to identify the relevant variables as predictors of the two phenomena, empiric studies and sociological theories by Esping-Andersen (1999) Nussbaum (1999, 2000, 2011), were consulted. This (with the data availability) frames the study to include five related categories of objective health and welfare indicators, including (1) demographic (e. g. life expectancy (LE), total fertility rate (TFR)), (2) child-welfare (i. e. under-five mortality rate (U5MR), (3) welfare services (immunization coverage and prevalence of tuberculosis (TB)), (4) education, and (5) indicators on health expenditure (HE). The applied theoretical frame–in a combination with the four posed research questions–indicates a need of an overall methodological approach that is primary quantitative. The data analysis follows an observational epidemiological type that is descriptive study, to analyse the indicators in five populations and two control groups.
    2. The study obtains descriptive data from three data bases, which are selected upon a qualitative analysis, to account for their validity and reliability.
    3. Further data analysis is strengthened qua the inclusion of the two control groups of populations, when appropriate. Since it wasn’t possible to compare data on populations across time, due to different data production methodologies.

    Main findings indicate that HE, immunization, TFR, male and female LE, U5MR and school enrolment, tend to diverge between and within the five populations, expressed in absolute and relative terms. The comparison of the estimated data for the five populations with the two control groups of populations, shows that most objective health and welfare indicators tend to converge, (within categories 1, 2 and 3, except TFR) when expressed in absolute and relative terms. When estimated data is analysed in the light of two sociological theories, it is evident that the existing gap between male and female LE, U5MR, and HE indicators can improve further.

  • 1192.
    Ahmetspahic, Emir
    Linköping University, Department of Computer and Information Science.
    Distributed Computing in Peer-to-peer Networks2004Independent thesis Basic level (professional degree)Student thesis
    Abstract [en]

    Concepts like peer-to-peer networks and distributed computing are not new. They have been available in different forms for a long time. This thesis examines the possibility of merging these concepts. The assumption is that non-centralized peer-to-peer networks can be used for effective sharing of computing resources. While most peer-to-peer systems today concentrate on sharing of data in various forms, this thesis concentrates on sharing of clock cycles instead of files.

  • 1193.
    Ahn, Henrik
    et al.
    Linköping University, Department of Medical and Health Sciences, Thoracic Surgery. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Heart and Medicine Centre, Department of Thoracic and Vascular Surgery in Östergötland.
    Baranowski, Jacek
    Linköping University, Department of Medical and Health Sciences, Clinical Physiology. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Heart and Medicine Centre, Department of Clinical Physiology UHL.
    Dahlin, Lars-Göran
    Linköping University, Department of Medical and Health Sciences, Thoracic Surgery. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Heart and Medicine Centre, Department of Thoracic and Vascular Surgery in Östergötland.
    Nielsen, Niels-Erik
    Linköping University, Department of Medical and Health Sciences, Cardiology. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Heart and Medicine Centre, Department of Cardiology UHL.
    Nylander, Eva
    Linköping University, Center for Medical Image Science and Visualization, CMIV. Linköping University, Department of Medical and Health Sciences, Clinical Physiology. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Heart and Medicine Centre, Department of Clinical Physiology UHL.
    Wallby, Lars
    Linköping University, Department of Medical and Health Sciences, Cardiology. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Heart and Medicine Centre, Department of Clinical Physiology UHL.
    TAVI without concomitant balloon dilatation2012Conference paper (Other academic)
  • 1194.
    Ahn, Henrik
    et al.
    Linköping University, Department of Medical and Health Sciences, Division of Cardiovascular Medicine. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Heart and Medicine Center, Department of Thoracic and Vascular Surgery.
    Baranowski, Jacek
    Myasnikova, Irina
    Rahgozar, Mohammad
    Linköping University, Department of Clinical and Experimental Medicine.
    Delshad, Baz
    First in man: wireless pressure sensors in left heart rooms'2014Conference paper (Refereed)
  • 1195.
    Ahn, Henrik Casimir
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Medicine and Care, Thoracic Surgery. Östergötlands Läns Landsting, Heart Centre, Department of Thoracic and Vascular Surgery.
    Mitral valve surgery - current results and future development to catheter based approaches2006In: International Society of Extracorporeal Circulation - Cardiac Surgery beyond 2006,2006, 2006Conference paper (Other academic)
  • 1196.
    Ahn, Henrik Casimir
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Medicine and Care, Thoracic Surgery. Östergötlands Läns Landsting, Heart Centre, Department of Thoracic and Vascular Surgery.
    The Impella temporary assist device, the Swedish experience2006In: International Society of Extracorporeal Circulation - Cardiac Surgery beyond 2006,2006, 2006Conference paper (Other academic)
  • 1197.
    Ahn, Henrik Casimir
    et al.
    Linköping University, Department of Medicine and Health Sciences, Thoracic Surgery. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Heart Centre, Department of Thoracic and Vascular Surgery.
    Baranowski, J
    Linköping University, Department of Medicine and Health Sciences, Clinical Physiology . Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Heart Centre, Department of Clinical Physiology.
    Nielsen, Nils Erik
    Linköping University, Department of Medicine and Health Sciences, Cardiology . Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Heart Centre, Department of Cardiology.
    Nylander, Eva
    Linköping University, Department of Medicine and Health Sciences, Clinical Physiology . Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Heart Centre, Department of Clinical Physiology.
    Tamas, Eva
    Linköping University, Department of Medicine and Health Sciences, Thoracic Surgery. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Heart Centre, Department of Thoracic and Vascular Surgery.
    Wallby, Lars
    Linköping University, Department of Medicine and Health Sciences, Cardiology . Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Heart Centre, Department of Clinical Physiology.
    Transcatheter aortic valve implantation in high-risk surgical candidates with low risk-scores1984Conference paper (Other academic)
  • 1198.
    Ahn, Henrik Casimir
    et al.
    Linköping University, Department of Medical and Health Sciences, Division of Cardiovascular Medicine. Linköping University, Faculty of Medicine and Health Sciences. Region Östergötland, Heart and Medicine Center, Department of Thoracic and Vascular Surgery.
    Baranowski, Jacek
    Linköping University, Department of Medical and Health Sciences, Division of Cardiovascular Medicine. Linköping University, Faculty of Medicine and Health Sciences. Region Östergötland, Heart and Medicine Center, Department of Clinical Physiology in Linköping.
    Dahlin, Lars-Göran
    Linköping University, Department of Medical and Health Sciences, Division of Cardiovascular Medicine. Linköping University, Faculty of Medicine and Health Sciences. Region Östergötland, Heart and Medicine Center, Department of Thoracic and Vascular Surgery.
    Nielsen, Niels Erik
    Linköping University, Department of Medical and Health Sciences, Division of Cardiovascular Medicine. Linköping University, Faculty of Medicine and Health Sciences. Region Östergötland, Heart and Medicine Center, Department of Cardiology in Linköping.
    Transvenous Implantation of a Stent Valve in Patients With Degenerated Mitral Prostheses and Native Mitral Stenosis2016In: Annals of Thoracic Surgery, ISSN 0003-4975, E-ISSN 1552-6259, Vol. 101, no 6, p. 2279-2284Article in journal (Refereed)
    Abstract [en]

    BACKGROUND: The purpose of this study was to report the use of a transvenous transseptal approach using a stent valve in patients with degenerated biological mitral valve prostheses, regurgitation after mitral repair, and native mitral stenosis.

    METHODS: Ten patients (median age, 74 years; range, 20-89 years; 5 men and 5 women) with degenerated mitral bioprosthetic valves (n = 7), failed mitral repair (n = 1), or calcified native stenotic valves (n = 2) underwent transvenous implantation of a stent valve.

    RESULTS: The procedure was initially successful in all patients. Predilation was performed for balloon sizing only in the 2 patients with native mitral stenosis. The stent valve was deployed during 1 period of rapid pacing. A guidewire, as a loop from the right femoral vein and through the left ventricular apex, facilitated a good angle and secure positioning of the stent valve. An ultrasonographically guided puncture of the apex was carried out in 6 patients, and in the other 4 we performed a minithoracotomy before apical puncture. All valves were implanted in a good position with improved function and without significant paravalvular leakage (PVL). There were no periprocedural deaths. The 30-day survival was 80% (8 of 10 patients), and 60% (6 of 10) of patients were still alive a median time of 290 days after the procedure.

    CONCLUSIONS: Transvenous transseptal implantation of a stent valve was performed in 10 patients with mitral valve disease, with good early functional results. These high-risk patients must be carefully selected by a multidisciplinary team because the procedure carries a high mortality.

  • 1199.
    Ahn, Henrik Casimir
    et al.
    Linköping University, Department of Medical and Health Sciences, Division of Cardiovascular Medicine. Linköping University, Faculty of Medicine and Health Sciences. Region Östergötland, Heart and Medicine Center, Department of Thoracic and Vascular Surgery.
    Holm, Jonas
    Linköping University, Department of Medical and Health Sciences, Division of Cardiovascular Medicine. Linköping University, Faculty of Medicine and Health Sciences. Region Östergötland, Heart and Medicine Center, Department of Thoracic and Vascular Surgery.
    Najar, Azad
    Scandinavian Real Heart AB, Vasteras, Sweden.
    Hellers, Goran
    Scandinavian Real Heart AB, Vasteras, Sweden.
    Szabó, Zoltán
    Linköping University, Department of Medical and Health Sciences, Division of Cardiovascular Medicine. Linköping University, Faculty of Medicine and Health Sciences. Region Östergötland, Heart and Medicine Center, Department of Thoracic and Vascular Surgery.
    A New Total Artificial Heart Concept Allowing Replacement or Support of the Native Heart2018In: Journal of Clinical & Experimental Cardiology, E-ISSN 2155-9880, Vol. 9, no 2, article id 1000569Article in journal (Refereed)
    Abstract [en]

    A total artificial heart (TAH) is typically used to bridge the time to heart transplantation. A device designed by Robert Jarvik has been improved through the years and under the name of Syncardia™ this has been the most successful commercially available TAH so far. Since 2008 the Carmat™ heart has been under development in Europe. The Scandinavian Real Heart™ is based on a unique physiological concept where the atrio-ventricular valve plane is of utmost importance in the pumping function of the heart. It consists of two identical parts driven separately by independent motors and in this first animal study we have used one part as a left ventricular assist device. This new concept makes the device flexible as it may be used not only as a TAH but also as a separate pump for left or right ventricular assist.

  • 1200.
    Ahn, Henrik Casimir
    et al.
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Medicine and Care, Thoracic Surgery. Östergötlands Läns Landsting, Heart Centre, Department of Thoracic and Vascular Surgery.
    Jodal, M.
    Lindhagen, J
    Lundgren, O.
    Nilsson, Gert
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Biomedical Instrumentation.
    Salerud, Göran
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Biomedical Instrumentation.
    Bestämning av tunntarmsblodflödet med laser Doppler teknik1984In: Läkarsällskapets Riksstämma,1984, 1984Conference paper (Other academic)
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