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  • 10001.
    Virtanen, Marianna
    et al.
    Finnish Institute of Occupational Health, Helsinki, Finland / Department of Public Health and Caring Sciences, University of Uppsala, Sweden.
    Jokela, Markus
    Institute of Behavioral Sciences, University of Helsinki, Helsinki, Finland.
    Madsen, Ida E. H.
    National Research Centre for the Working Environment, Copenhagen, Denmark.
    Magnusson Hanson, Linda L.
    Stress Research Institute, Stockholm University, Stockholm, Sweden.
    Lallukka, Tea
    Finnish Institute of Occupational Health, Helsinki, Finland / Department of Public Health, University of Helsinki, Finland.
    Nyberg, Solja T.
    Department of Public Health, University of Helsinki, Finland.
    Alfredsson, Lars
    Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden / Centre for Occupational and Environmental Medicine, Stockholm County Council, Sweden.
    Batty, G David
    Department of Epidemiology and Public Health, University College London, United Kingdom.
    Bjorner, Jakob B.
    National Research Centre for the Working Environment, Copenhagen, Denmark.
    Borritz, Marianne
    Department of Occupational Medicine, Koge Hospital, Koge, Denmark.
    Burr, Hermann
    Federal Institute for Occupational Safety and Health (BAuA), Berlin, Germany.
    Dragano, Nico
    Institute for Medical Sociology, Medical Faculty, University of Düsseldorf, Düsseldorf, Germany.
    Erbel, Raimund
    Department of Cardiology, West-German Heart Center Essen, University Duisburg-Essen, Essen, Germany.
    Ferrie, Jane E.
    Department of Epidemiology and Public Health, University College London, London, United Kingdom / School of Social and Community Medicine, University of Bristol, Bristol, United Kingdom.
    Heikkilä, Katriina
    Department of Health Services and Policy, London School of Hygiene and Tropical Medicine, London, United Kingdom.
    Knutsson, Anders
    Department of Health Sciences, Mid Sweden University, Sundsvall, Sweden.
    Koskenvuo, Markku
    Department of Public Health, University of Helsinki, Finland.
    Lahelma, Eero
    Department of Public Health, University of Helsinki, Finland.
    Nielsen, Martin L.
    Unit of Social Medicine, Frederiksberg University Hospital, Copenhagen, Denmark.
    Oksanen, Tuula
    Finnish Institute of Occupational Health, Helsinki, Finland.
    Pejtersen, Jan H.
    Danish National Centre for Social Research, Copenhagen, Denmark.
    Pentti, Jaana
    Department of Public Health, University of Helsinki, Finland.
    Rahkonen, Ossi
    Department of Public Health, University of Helsinki, Finland.
    Rugulies, Reiner
    National Research Centre for the Working Environment, Copenhagen, Denmark / Department of Public Health and Department of Psychology, University of Copenhagen, Copenhagen, Denmark.
    Salo, Paula
    Finnish Institute of Occupational Health, Helsinki, Finland / Department of Psychology, University of Turku, Turku, Finland.
    Schupp, Jürgen
    German Institute for Economic Research, Berlin, Germany / Free University of Berlin, Berlin, Germany.
    Shipley, Martin J.
    Department of Epidemiology and Public Health, University College London, London, United Kingdom.
    Siegrist, Johannes
    Institute for Medical Sociology, Medical Faculty, University of Düsseldorf, Düsseldorf, Germany.
    Singh-Manoux, Archana
    Department of Epidemiology and Public Health, University College London, London, United Kingdom / Centre for Research in Epidemiology and Population Health, Villejuif, France.
    Suominen, Sakari
    University of Skövde, School of Health and Education. University of Skövde, Health and Education. Department of Public Health, University of Turku, Turku, Finland / Folkhälsan Research Center, Helsinki, Finland.
    Theorell, Töres
    Stress Research Institute, Stockholm University, Stockholm, Sweden.
    Vahtera, Jussi
    Department of Public Health, University of Turku, Turku, Finland / Turku University Hospital, Turku, Finland.
    Wagner, Gert G.
    German Institute for Economic Research, Berlin, Germany / Max Planck Institute for Human Development, Berlin, Germany / Berlin University of Technology, Berlin, Germany.
    Wang, Jian Li
    University of Ottawa Institute of Mental Health Research, School of Epidemiology, Public Health and Preventive Medicine, University of Ottawa, Ottawa, Canada.
    Yiengprugsawan, Vasoontara
    Centre for Research on Ageing, Health and Wellbeing and the ARC Centre of Excellence on Population Ageing Research, The Australian National University, Canberra, Australia.
    Westerlund, Hugo
    Stress Research Institute, Stockholm University, Stockholm, Sweden.
    Kivimäki, Mika
    Finnish Institute of Occupational Health, Helsinki, Finland / Department of Public Health, University of Helsinki, Finland / Department of Epidemiology and Public Health, University College London, London, United Kingdom.
    Long working hours and depressive symptoms: systematic review and meta-analysis of published studies and unpublished individual participant data2018In: Scandinavian Journal of Work, Environment and Health, ISSN 0355-3140, E-ISSN 1795-990X, Vol. 44, no 3, p. 239-250, article id 3712Article, review/survey (Refereed)
    Abstract [en]

    Objectives This systematic review and meta-analysis combined published study-level data and unpublished individual-participant data with the aim of quantifying the relation between long working hours and the onset of depressive symptoms. Methods We searched PubMed and Embase for published prospective cohort studies and included available cohorts with unpublished individual-participant data. We used a random-effects meta-analysis to calculate summary estimates across studies. Results We identified ten published cohort studies and included unpublished individual-participant data from 18 studies. In the majority of cohorts, long working hours was defined as working ≥55 hours per week. In multivariable-adjusted meta-analyses of 189 729 participants from 35 countries [96 275 men, 93 454 women, follow-up ranging from 1-5 years, 21 747 new-onset cases), there was an overall association of 1.14 (95% confidence interval (CI) 1.03-1.25] between long working hours and the onset of depressive symptoms, with significant evidence of heterogeneity (I 2=45.1%, P=0.004). A moderate association between working hours and depressive symptoms was found in Asian countries (1.50, 95% CI 1.13-2.01), a weaker association in Europe (1.11, 95% CI 1.00-1.22), and no association in North America (0.97, 95% CI 0.70-1.34) or Australia (0.95, 95% CI 0.70-1.29). Differences by other characteristics were small. Conclusions This observational evidence suggests a moderate association between long working hours and onset of depressive symptoms in Asia and a small association in Europe.

  • 10002.
    Virén, Henrik
    et al.
    University of Skövde, School of Business.
    Dahlström, Sandro
    University of Skövde, School of Business.
    Communication of Environmental Issues: A Comparison Between Sustainability Reports and Social Media in the Automotive Industry2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Sustainability is a topic that has become increasingly important for companies over the last decades. The increasing pressure from stakeholders has led to communication of sustainability to be very important for companies who wish to be seen as sustainable. The main way corporations communicate their sustainability activities are through the annual report. Whether in a standalone sustainability report or as an integrated part of the whole annual report, most of the larger companies today have some form of sustainability reporting. Over the last years, other ways of communicating sustainability activities have surfaced. The social media boom has created an excellent communication channel for companies to directly communicate with its stakeholders.  In the automotive industry environmental issues have been a focus point for many companies over the last decades. Pressure from society and stakeholders to produce more environmentally friendly vehicles have only increased over the last years. This leads us to the purpose of this study, which is to compare the communication of environmental issues in social media and in sustainability reports in the automotive industry.

    The study has been done by conducting a content analysis of the sustainability reports and posts on social media sites. Beside the content analysis, our thesis contains a quantitative part to emphasize which environmental topics the companies communicate about. The Global Reporting Initiatives environmental indicators have been used to do the quantitative part of this study. This has helped us divide the different information into various environmental topics to see what is being communicated. The timeframe for the study have been 1st of January 2015 to 31st December 2017, which means we have looked at three years of social media activity and three sustainability reports for the companies in the study. The companies involved in the study are BMW, Groupe Renault, Volvo Cars, and Volkswagen.

    The results of our study show that social media and sustainability reports to be very different types of communication channels. Social media revolves around short promotional messages, while sustainability reports aim to give a more fair and broad view of the companies’ environmental engagements. In sustainability reports we have found information to cover most of the environmental indicators, while on social media there is a focus on a smaller amount of topics. Another finding concerns target audience which differ for the studied communication channels. Social media are more directed towards the customer type of stakeholders, while the sustainability reports are more directed towards an investor type of stakeholder.

  • 10003.
    Visuttijai, Kittichate
    University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre. Department of Medical and Clinical Genetics, Sahlgrenska Academy, University of Gothenburg, Gothenburg.
    Cellular, Molecular and Functional Characterization of the Tumor Suppressor Candidate MYO1C2016Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Tumor suppressor genes play a role as a growth regulator and a gatekeeper of a cell. Their inactivation is often detected in malignant tumors. Identification of novel tumor suppressor gene candidates may help to further understand tumorigenesis and aid in the discovery of a new treatment leading toward cure of cancer.

    This PhD research project aimed to understand functional significance of a novel tumor suppressor gene candidate, myosin IC (MYO1C) and to identify potential interaction(s) of the MYO1C protein with key components of the signaling pathways involving in cancer development.

    In an experimental rat model for endometrial carcinoma (EC), detailed molecular genetic analysis of a candidate tumor suppressor region located distal to the tumor protein 53 (Tp53) suggested the myosin IC gene (Myo1c) as the best potential target for deletion of the genetic material. The question arising was whether and how MYO1C could function as a tumor suppressor gene. By using qPCR, Western blot or immunohistochemistry analyses, we examined MYO1C protein level in panels of well-stratified human colorectal cancer (CRC) and EC respectively. We found that MYO1C was significantly down-regulated in these cancer materials and that for the EC panel, the observed down-regulation of MYO1C correlated with tumor stage, where tumors at more advanced stages had less expression of MYO1C. In cell transfection experiments, we found that over-expression of MYO1C significantly decreased cell proliferation, and silencing MYO1C with siRNA increased cell viability. Additionally, knockdown of MYO1C impaired the ability of cells to migrate, spread and adhere to the surface. Recent published studies suggested a potential interplay between MYO1C and the phosphoinositide 3-kinase (PI3K)/AKT pathway. To examine this hypothesis, we analyzed the expression and/or activation of components of the PI3K/AKT and RAS/ERK signaling pathways in vivo in CRC samples, and in vitro in cells transfected with the MYO1C gene expression construct or MYO1C-targeted siRNA. To identify other potential pathways/ mechanisms through which MYO1C may exert its tumor suppressor activity, we additionally performed new sets of MYO1C-siRNA knockdown experiments. At different time points post transfection, we performed microarray global gene expression experiments followed by bioinformatics analysis of the data. Altogether, the results suggested an early PI3K/AKT response to altered MYO1C expression. We additionally identified several cancer-related genes/pathways with late response to MYO1C knockdown. All things considered, the identification of MYO1C-expression impact on cell proliferation, migration, and adhesion in combination with its interplay between several cancer-related genes and signaling pathways provide further evidence for the initial hypothesis of a tumor suppressor activity of MYO1C. 

  • 10004.
    Visuttijai, Kittichate
    et al.
    University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre. Department of Medical and Clinical Genetics, Sahlgrenska Academy, University of Gothenburg.
    Pettersson, Jennifer
    Department of Medical and Clinical Genetics, Sahlgrenska Academy, University of Gothenburg, Gothenburg.
    Mehrbani Azar, Yashar
    University of Skövde, School of Bioscience.
    van den Bout, Iman
    Department of physiology, Faculty of Health Sciences, University of Pretoria, South Africa.
    Örndal, Charlotte
    Department of Pathology, Sahlgrenska University Hospital, Gothenburg.
    Marcickiewicz, Janusz
    Department of Obstetrics and Gynecology, Halland Hospital Varberg, Varberg.
    Nilsson, Staffan
    Institute of Mathematical Statistics, Chalmers University of Technology, Gothenburg.
    Hörnquist, Michael
    Department of Science and Technology, University of Linköping, Norrköping.
    Olsson, Björn
    University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre.
    Ejeskär, Katarina
    University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre.
    Behboudi, Afrouz
    University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre.
    Lowered Expression of Tumor Suppressor Candidate MYO1CStimulates Cell Proliferation, Suppresses Cell Adhesion and Activates AKT2016In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 11, no 10, article id e0164063Article in journal (Refereed)
    Abstract [en]

    Myosin-1C (MYO1C) is a tumor suppressor candidate located in a region of recurrent losses distal to TP53. Myo1c can tightly and specifically bind to PIP2, the substrate of Phosphoinositide 3-kinase (PI3K), and to Rictor, suggesting a role for MYO1C in the PI3K pathway. This study was designed to examine MYO1C expression status in a panel of well-stratified endometrial carcinomas as well as to assess the biological significance of MYO1C as a tumor suppressor in vitro. We found a significant correlation between the tumor stage and lowered expression of MYO1C in endometrial carcinoma samples. In cell transfection experiments, we found a negative correlation between MYO1C expression and cell proliferation, and MYO1C silencing resulted in diminished cell migration and adhesion. Cells expressing excess of MYO1C had low basal level of phosphorylated protein kinase B (PKB, a.k.a. AKT) and cells with knocked down MYO1C expression showed a quicker phosphorylated AKT (pAKT) response in reaction to serum stimulation. Taken together the present study gives further evidence for tumor suppressor activity of MYO1C and suggests MYO1C mediates its tumor suppressor function through inhibition of PI3K pathway and its involvement in loss of contact inhibition.

  • 10005.
    Vitale, Pasquale
    University of Skövde, School of Humanities and Informatics.
    EVALUATION ANDMEASUREMENTS OF KINECTMOVEMENT DETECTION IN PHYSICAL THERAPY2012Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The Kinect device is commonly associated to videogames, but this is not the only purpose of this device. Going into more depth, it could be a powerful tool to accomplish several goals, not only related to simple games. One such example could be Serious Games. Above all, Kinect device is a group of sensors and as such it is an attraction point in order to do experiments and measurements. This thesis tries to understand the potentiality and specifically tries to understand the precision and accuracy in the explicit area of rehabilitation. Taking advantage of the Kinect functionality, the thesis tries to enter in a young area, composed by two principal field of interest: catching and recognizing movements without the help of tool to wear, and the movements in order to do physical therapy. The result of this thesis is that the accuracy and precision of the Kinect device is sufficient for detecting therapeutic movements. Further work is however needed to be able to use Kinect for automatic discrimination of correct and incorrect physical movements.

  • 10006.
    Vithlani, Sharmila
    University of Skövde, School of Health and Education.
    Modersmålsundervisning: Det gemensamma ansvaret för hela organisationen i grundskolan2018Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Bristande kunskaper om modersmålsundervisning och dess organisering bland grundskolelärare kan ge fel uppfattningar om ämnets innehåll. Denna studie utgick ifrån olika ledningsaktörers professionella ansvar att utveckla grundskolelärarnas existerande kunskaper om hur (vi) modersmålslärare arbetar och är organiserade. Ett professionellt ansvar, som samtliga pedagogiska aktörer i grundskolan bör ha. Studien tog del av föreställningar om modersmålsundervisning som framträdde hos anställda på ledningsnivå och fördjupades vidare på vilket sätt och varför dessa föreställningar kunde vara betydelsefulla för grundskolans kvalitativa utvecklingsarbete.

    Föreställningar som framträdde hos ledningsaktörerna om grundskolelärarnas existerande kunskaper om modersmålsundervisning och dess organisering sågs i relation till olika kunskapssyn: vetenskaplig kunskap, tyst kunskap och vardagskunskap utifrån erfarenheter. Dessa tre olika kunskapssyner hade tillägnats och var en del av den praxisgemenskapen inom skolans verksamhet som synliggjordes genom aktiv deltagande i samspel med andra. Detta har gjorts från individnivå genom interaktion med andra till ett större kollektiv d.v.s. organisationsnivå. Den tysta kunskapen behöver artikuleras och ledningsaktörerna behöver skapa mötesforum för detta.

    Studien visade en lärande process där den utgick ifrån ledningsaktörernas synpunkter kring grundskolelärarnas bristande kunskaper om ämnet modersmål och dess organisering. Dessa synpunkter sattes i relation till ett utvecklingsarbete där det systematiska kvalitetsarbetet blev en levande process. Denna lärande process kan leda till ett förbättringsarbete inom grundskolans verksamhet som i sin tur kan skapa likvärdiga förutsättningar inom utbildning för elever som har ett annat modersmål än svenska. 

  • 10007.
    Vixner, Linda
    et al.
    Division of Reproductive Health, Department of Women's and Children's Health, Karolinska Institutet, Retzius väg 13A, 171 77 Stockholm, Sweden / School of Health and Social Studies, Dalarna University, Högskolan Dalarna, 791 88 Falun, Sweden.
    Mårtensson, Lena B.
    University of Skövde, School of Life Sciences.
    Stener-Victorin, Elisabet
    Institute of Neuroscience and Physiology, Department of Physiology, Sahlgrenska Academy, University of Gothenburg, 405 30 Gothenburg, Sweden / Department of Obstetrics and Gynecology, First Affiliated Hospital, Heilongjiang University of Chinese Medicine, Harbin 150040, China.
    Schytt, Erica
    Karolinska Inst, Div Reprod Hlth, Dept Womens & Childrens Hlth, S-17177 Stockholm, Sweden / Ctr Clin Res Dalarna, S-79182 Falun, Sweden / Division of Reproductive Health, Department of Women's and Children's Health, Karolinska Institutet, Retzius väg 13A, 171 77 Stockholm, Sweden / Centre for Clinical Research Dalarna, Nissers väg 3, 791 82 Falun, Sweden.
    Manual and Electroacupuncture for Labour Pain: Study Design of a Longitudinal Randomized Controlled Trial2012In: Evidence-based Complementary and Alternative Medicine, ISSN 1741-427X, E-ISSN 1741-4288, p. Article ID 943198-Article in journal (Refereed)
    Abstract [en]

    Introduction. Results from previous studies on acupuncture for labour pain are contradictory and lack important information on methodology. However, studies indicate that acupuncture has a positive effect on women's experiences of labour pain. The aim of the present study was to evaluate the efficacy of two different acupuncture stimulations, manual or electrical stimulation, compared with standard care in the relief of labour pain as the primary outcome. This paper will present in-depth information on the design of the study, following the CONSORT and STRICTA recommendations. Methods. The study was designed as a randomized controlled trial based on western medical theories. Nulliparous women with normal pregnancies admitted to the delivery ward after a spontaneous onset of labour were randomly allocated into one of three groups: manual acupuncture, electroacupuncture, or standard care. Sample size calculation gave 101 women in each group, including a total of 303 women. A Visual Analogue Scale was used for assessing pain every 30 minutes for five hours and thereafter every hour until birth. Questionnaires were distributed before treatment, directly after the birth, and at one day and two months postpartum. Blood samples were collected before and after the first treatment. This trial is registered at ClinicalTrials.gov:NCT01197950.

  • 10008.
    Vixner, Linda
    et al.
    Department of Women’s and Children’s Health, Division of Reproductive Health, Karolinska Institutet, Stockholm, Sweden / School of Health and Social Studies, Dalarna University, Sweden.
    Mårtensson, Lena
    University of Skövde, School of Health and Education. University of Skövde, Health and Education.
    Schytt, Erica
    Department of Women’s and Children’s Health, Division of Reproductive Health, Karolinska Institutet, Sweden / Centre for Clinical Research Dalarna, Falun, Sweden.
    Acupuncture with manual and electrical stimulation for labour pain: a two month follow up of recollection of pain and birth experience2015In: BMC Complementary and Alternative Medicine, ISSN 1472-6882, E-ISSN 1472-6882, Vol. 15, no 1, article id 180Article in journal (Refereed)
  • 10009.
    Vixner, Linda
    et al.
    Department of Women's and Children's Health, Division of Reproductive Health, Karolinska Institutet, Stockholm, Sweden / School of Health and Social Studies, Dalarna University, Falun, Sweden.
    Schytt, Erica
    Centre for Clinical Research Dalarna, Falun, Sweden / Bergen University Collage, Bergen, Norway.
    Mårtensson, Lena B.
    University of Skövde, School of Health and Education. University of Skövde, Health and Education.
    Associations between maternal characteristics and women's responses to acupuncture during labour: a secondary analysis from a randomised controlled trial2017In: Acupuncture in Medicine, ISSN 0964-5284, E-ISSN 1759-9873, Vol. 35, no 3, p. 180-188Article in journal (Refereed)
  • 10010.
    Vixner, Linda
    et al.
    Department of Women’s and Children’s Health, Division of Reproductive Health, Karolinska Institutet, Stockholm, Sweden / School of Health and Social Studies, Dalarna University, Falun, Sweden.
    Schytt, Erica
    Department of Women’s and Children’s Health, Division of Reproductive Health, Karolinska Institutet, Stockholm, Sweden / Centre for Clinical Research Dalarna, Falun, Sweden.
    Stener-Victorin, Elisabet
    Department of Physiology, Sahlgrenska Academy, Institute of Neuroscience and Physiology, University of Gothenburg, Sweden.
    Waldenström, Ulla
    Department of Women’s and Children’s Health, Division of Reproductive Health, Karolinska Institutet, Stockholm, Sweden.
    Pettersson, Hans
    Department of Clinical Science and Education, Södersjukhuset Karolinska Institutet, Stockholm, Sweden.
    Mårtensson, Lena B.
    University of Skövde, School of Health and Education. University of Skövde, Health and Education.
    Acupuncture with manual and electrical stimulation for labour pain: a longitudinal randomised controlled trial2014In: BMC Complementary and Alternative Medicine, ISSN 1472-6882, E-ISSN 1472-6882, Vol. 14, article id 187Article in journal (Refereed)
    Abstract [en]

    Background: Acupuncture is commonly used to reduce pain during labour despite contradictory results. The aim of this study is to evaluate the effectiveness of acupuncture with manual stimulation and acupuncture with combined manual and electrical stimulation (electro-acupuncture) compared with standard care in reducing labour pain. Our hypothesis was that both acupuncture stimulation techniques were more effective than standard care, and that electro-acupuncture was most effective.

    Methods: A longitudinal randomised controlled trial. The recruitment of participants took place at the admission to the labour ward between November 2008 and October 2011 at two Swedish hospitals . 303 nulliparous women with normal pregnancies were randomised to: 40 minutes of manual acupuncture (MA), electro-acupuncture (EA), or standard care without acupuncture (SC). Primary outcome: labour pain, assessed by Visual Analogue Scale (VAS). Secondary outcomes: relaxation, use of obstetric pain relief during labour and post-partum assessments of labour pain. The sample size calculation was based on the primary outcome and a difference of 15 mm on VAS was regarded as clinically relevant, this gave 101 in each group, including a total of 303 women.

    Results: Mean estimated pain scores on VAS (SC: 69.0, MA: 66.4 and EA: 68.5), adjusted for: treatment, age, education, and time from baseline, with no interactions did not differ between the groups (SC vs MA: mean difference 2.6, 95% confidence interval [CI] -1.7-6.9 and SC vs EA: mean difference 0.6 [95% CI] -3.6-4.8). Fewer number of women in the EA group used epidural analgesia (46%) than women in the MA group (61%) and SC group (70%) (EA vs SC: odds ratio [OR] 0.35; [95% CI] 0.19-0.67).

    Conclusions: Acupuncture does not reduce women’s experience of labour pain, neither with manual stimulation nor with combined manual and electrical stimulation. However, fewer women in the EA group used epidural analgesia thus indicating that the effect of acupuncture with electrical stimulation may be underestimated.

    These findings were obtained in a context with free access to other forms of pain relief.

  • 10011.
    Vizlin, Albina
    University of Skövde, Department of Computer Science.
    Produktdesign: om kundernas inflytande och produktionskraven1999Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [sv]

    Detta arbetets syfte är att klargöra om ett företag kan få sin lönsamhet ökad genom att låta kunderna påverka produktdesign eller genom att anpassa produktdesign till produktionskrav. För att kunna dra slutsatser utifrån problemformuleringen har intervjuer genomförts i fyra företag som agerar i olika branscher och tillverkar produkter där designen spelar relativt stor roll.

    Slutsatserna är i stort sett att företagen idag inte har användarorienterad design, men allting tyder på att detta kommer att ändras i framtiden. Konkurrensen har blivit allt hårdare och nya krav på tilltalande design tillkommer hela tiden. Tack vare användarorienterad design skulle ett företag kunna öka sin lönsamhet på lång sikt, men det skulle troligtvis ta några år innan dess, och företaget skulle tvingas arbeta irrationellt under denna period.

    Genom att helt anpassa produktdesign till produktionskrav skulle ett företag kunna öka sin lönsamhet och därmed tillverka fler kvalitetsprodukter och ha nöjda kunder.

  • 10012.
    Vojdani Moghaddam, Mohammad
    University of Skövde, School of Health and Education.
    Skyddsfaktorer som påverkar psykisk hälsa och välbefinnande hos ensamkommande barn: En litteraturstudie2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Background: The number of unaccompanied children seeking asylum in Europe has increased over the last decades and reached their peak so far in 2015 with 90,000 unaccompanied asylum seekers, of whom 35,000 came to Sweden. Unaccompanied children, who fled request asylum because war, conflict and poverty. The prolonged asylum process, temporary residence and previous trauma increase the risk of depression and PTSD. Even so, there are unaccompanied children who manage to do well in very difficult circumstances. Aim: The purpose of this paper was to highlight protection factors that promote mental health and well-being of unaccompanied children. Method: This study is a systematic literature review and 16 scientific articles have been included in the analysis. Results: Four themes were identified as protection factors; Social support, motivation, religion and distraction. Social support proved to be among the important protection factor for the mental health and well-being of unaccompanied children. Discussion: The outcome of this study showed that unaccompanied children in spite of the difficulties they have undergone, have strengths and strategies that help them to new circumstances. The study also demonstrated the importance of creating secure relationships and obtaining support from trusted persons in unaccompanied children's surroundings. This study can advantageously provide actors who directly or indirectly work with unaccompanied children, with knowledge and understanding which can hopefully contribute to increased mental health and well-being of this vulnerable group.

  • 10013.
    Volanen, Salla-Maarit
    et al.
    Folkhälsan Research Center, Helsinki, Finland / Department of Public Health, University of Helsinki, Helsinki, Finland.
    Lassander, Maarit
    Institute of Behavioural Sciences, University of Helsinki, Helsinki, Finland.
    Hankonen, Nelli
    School of Social Sciences and Humanities, University of Tampere, Tampere, Finland.
    Santalahti, Päivi
    National Institute for Health and Welfare, Helsinki, Finland.
    Hintsanen, Mirka
    Unit of Psychology, University of Oulu, Oulu, Finland.
    Simonsen, Nina
    Folkhälsan Research Center, Helsinki, Finland / Department of Public Health, University of Helsinki, Helsinki, Finland.
    Raevuori, Anu
    Department of Public Health, University of Helsinki, Helsinki, Finland / Department of Adolescent Psychiatry, Helsinki University Central Hospital, Helsinki, Finland / Department of Mental Health and Substance Abuse Services, National Institute for Health and Welfare, Helsinki, Finland.
    Mullola, Sari
    Institute of Behavioural Sciences, University of Helsinki, Helsinki, Finland / Department of Teacher Education, University of Helsinki, Helsinki, Finland.
    Vahlberg, Tero
    Department of Biostatistics, University of Turku, Turku, Finland.
    But, Anna
    Department of Public Health, University of Helsinki, Helsinki, Finland.
    Suominen, Sakari
    University of Skövde, School of Health and Education. University of Skövde, Health and Education. Folkhälsan Research Center, Helsinki, Finland / Department of Public Health, University of Turku, Turku, Finland.
    Healthy Learning Mind - a school-based mindfulness and relaxation program: a study protocol for a cluster randomized controlled trial2016In: BMC Psychology, E-ISSN 2050-7283, Vol. 4, article id 35Article in journal (Refereed)
    Abstract [en]

    BACKGROUND: Mindfulness has shown positive effects on mental health, mental capacity and well-being among adult population. Among children and adolescents, previous research on the effectiveness of mindfulness interventions on health and well-being has shown promising results, but studies with methodologically sound designs have been called for. Few intervention studies in this population have compared the effectiveness of mindfulness programs to alternative intervention programs with adequate sample sizes.

    METHODS/DESIGN: Our primary aim is to explore the effectiveness of a school-based mindfulness intervention program compared to a standard relaxation program among a non-clinical children and adolescent sample, and a non-treatment control group in school context. In this study, we systematically examine the effects of mindfulness intervention on mental well-being (primary outcomes being resilience; existence/absence of depressive symptoms; experienced psychological strengths and difficulties), cognitive functions, psychophysiological responses, academic achievements, and motivational determinants of practicing mindfulness. The design is a cluster randomized controlled trial with three arms (mindfulness intervention group, active control group, non-treatment group) and the sample includes 59 Finnish schools and approx. 3 000 students aged 12-15 years. Intervention consists of nine mindfulness based lessons, 45 mins per week, for 9 weeks, the dose being identical in active control group receiving standard relaxation program called Relax. The programs are delivered by 14 educated facilitators. Students, their teachers and parents will fill-in the research questionnaires before and after the intervention, and they will all be followed up 6 months after baseline. Additionally, students will be followed 12 months after baseline. For longer follow-up, consent to linking the data to the main health registers has been asked from students and their parents.

    DISCUSSION: The present study examines systematically the effectiveness of a school-based mindfulness program compared to a standard relaxation program, and a non-treatment control group. A strength of the current study lies in its methodologically rigorous, randomized controlled study design, which allows novel evidence on the effectiveness of mindfulness over and above a standard relaxation program.

    TRIAL REGISTRATION: ISRCTN18642659 . Retrospectively registered 13 October 2015.

  • 10014.
    von Dewall, Johannes
    et al.
    University of Skövde, School of Engineering Science.
    Johansson-Näslund, Markus
    University of Skövde, School of Engineering Science.
    Hållfasthetssimulering av hydrauliska högtryckskopplingar2018Independent thesis Basic level (university diploma), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Hydraulic FEM ½" high pressure couplings are studied with the purpose of establishing an effective methodology that can be used to predict the strength of the couplings. The methodology consists of finite element analyzes (FEA) and is validated by experimental pressure tests, performed on the FEM ½” couplings pairs.  Using FEA, the couplings solid mechanical behavior and maximum load ability can be viewed virtual, reducing the need for experimental tests and gives the potential for optimized products. The work is performed at Parker Hannifin AB in Skovde.

    Experimental tests are performed on 20 FEM ½” couplings pairs, to understand the solid mechanical behavior of the couplings until failure occurs, and to predict the maximum pressure that can be applied. The experimental structure and performance is based on the method Design of Experiments (DOE). Critical components are identified based on the results from the experimental tests, which are then studied more closely through FEA. The analysis are validated based on the applied material model, and data collected during the experimental tests.

    From the experimental tests it is shown that the components: ball cage, guide and plug housing are the components in which failure occur. In case of failure, two failure modes appear as common, that the ball cage is worn apart and that the guide burst, both types of failure modes occur at a similar pressure. The analysis for the guide and ball cage corresponds with the experimental outcomes. Differences occurs however when looked at the deformations, in which the plug housing shows the largest deviation when compared to the experimental results.

    The usage of FE-models appears to be appropriate for predicting and evaluating the mechanical strengths of the couplings during pressure loads. The analysis are however entirely dependent on the input data, where an incorrect material model generates incorrect results. The relationship is shown for the plug housing, which lack the mechanical properties related to curing processes.

  • 10015.
    von Friesendorff, Rickard
    University of Skövde, School of Informatics.
    Navigering och mental representation med ljud i en icke-visuell 3D miljö2019Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Denna studie tar upp forskning kring tillgänglighet inom data/tv-spel och fokuserar främst på ljudspel, en genre som särskilt uppstått för synnedsatta. Texten tar upp frågeställningen kring seende personers upplevelser av ljudspel och att kvalitativ data ska samlas in för denna studie. Metoden diskuteras och relevant forskning för denna studie nämns därefter. Genom att lyfta fram viktiga designval för genren ljudspel har en artefakt skapats dedikerad till studien. Denna artefakt består av ett enkelt spel med syfte att undersöka seende personers förmåga att navigera i en okänd 3D-miljö utan grafik, samt undersöka deras mentala representation av 3D-miljön. Undersökningen visade resultat som gav förståelse för personers upplevelse av ljudspel och hur deras mentala bild ser ut. För framtida arbeten borde även synnedsatta ta del av artefakten för att se om den mentala representationen skiljer sig mellan grupperna.

  • 10016.
    von Knorring, Åsa
    et al.
    University of Skövde, School of Humanities and Informatics.
    Löfgren, Åsa
    University of Skövde, School of Humanities and Informatics.
    Utsatta barns behov: En kvalitativ studie om förskollärares uppfattningar2012Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The object of this study was to make research into preschool teachers’ perceptions of the needs of vulnerable children in preschool. The study starts off with the following three issues; what are preschool teachers’ perceptions regarding the needs of vulnerable children in preschool? How do preschool teachers view their opportunities to create more favorable conditions for vulnerable children in preschool? What are preschool teachers’ perceptions of how to discover vulnerable children in the preschool setting? This phenomenografhic study was based on six qualitative interviews with preschool teachers working at four different preschools. The result is shown as different descriptive categories. When it comes to the needs of vulnerable children the categories are; needs in connection to the child; psychosocial and biological and needs in connection to the environment. When it comes to more favorable conditions for vulnerable children in preschool the categories are; external support for more favorable conditions and interpersonal relationships for more favorable conditions in preschool. Regarding how to discover vulnerable children in preschool there are these categories; obvious signs as an indication of vulnerability and implicit signs contributing to a suspicion of vulnerability. The result shows a variety of conceptions and they are looked upon from the standpoint of the ecological systems theory where the preschool setting can be seen in a context where all aspects and different environments influence vulnerable childrens opportunities to develop into healthy human beings.

  • 10017.
    von Porath, Maria
    et al.
    University of Skövde, School of Life Sciences.
    Jarneståhl, Jonna
    University of Skövde, School of Life Sciences.
    Faktorer som påverkar sjuksköterskors upplevelse av palliativ vård2009Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Palliative care is a special kind of care that focuses on giving relief care to patients that are living with life threatening diseases. The disease is no longer in focus in palliative care and it is therefore offered to people who have an incurable life threatening disease. It focuses on relieving the patient’s discomfort and suffering, increase wellbeing and create conditions for an increased quality of life. Aim: The aim was to describe factors that influence on nurse’s experience of palliative care. Method: In order to give an objective and systematic conclusion of the current knowledge a literature study was chosen. Result: The palliative care is complex and nine factors emerged that play an important role in the nurse's experiences of palliative care. These factors were professional experience and skills, lack of professional experience and skills, strengthening relationships, co-worker support, and lack of ability to keep a professional distance, relative’s denial, lack of cooperation between the nurses and doctors, holistic care and symptom control and lack of holistic care and symptom control. These factors influenced nurse’s experiences, both positive and negative. Positive experiences were to find meaning in their work, satisfaction, personal development and confirmation. Meaningless, stress, inadequacy and anxiety were negative experiences.

  • 10018.
    von Post, Iréne
    University of Skövde, School of Life Sciences.
    Naturlig, den ursprungliga tilliten, det spontana, det äkta och det ädla i vårdandet2003In: GRYNING II: klinisk vårdvetenskap, Institutionen för vårtvetenskap, åbo , 2003Chapter in book (Other academic)
  • 10019.
    Vondracek, Petr
    et al.
    Department of Pediatric Neurology, University Hospital and Masaryk University, Brno, Czech Republic.
    Hermanova, Marketa
    Department of Pathology, University Hospital and Masaryk University, Brno, Czech Republic.
    Vodickova, Kristina
    Department of Pediatric Ophtalmology, University Hospital and Masaryk University, Brno, Czech Republic.
    Fajkusova, Lenka
    Department of Molecular Biology and Gene Therapy, University Hospital and Masaryk University, Brno, Czech Republic.
    Blakely, Emma L.
    Mitochondrial Research Group, School of Neurology, Neurobiology and Psychiatry, The Medical School, University of Newcastle upon Tyne, UK.
    He, Langping
    Mitochondrial Research Group, School of Neurology, Neurobiology and Psychiatry, The Medical School, University of Newcastle upon Tyne, UK.
    Turnbull, Douglass M.
    Mitochondrial Research Group, School of Neurology, Neurobiology and Psychiatry, The Medical School, University of Newcastle upon Tyne, UK.
    Taylor, Robert W.
    Mitochondrial Research Group, School of Neurology, Neurobiology and Psychiatry, The Medical School, University of Newcastle upon Tyne, UK.
    Tajsharghi, Homa
    Department of Pathology, Sahlgrenska University Hospital, Göteborg, Sweden.
    An unusual case of congenital muscular dystrophy with normal serum CK level, external ophtalmoplegia, and white matter changes on brain MRI2007In: European journal of paediatric neurology, ISSN 1090-3798, E-ISSN 1532-2130, Vol. 11, no 6, p. 381-384Article in journal (Refereed)
    Abstract [en]

    We report a sporadic case of congenital muscular dystrophy (CMD) in a 13-year-old girl with early manifestation of muscle weakness and hypotonia, severe contractures, bulbar syndrome, progressive external ophtalmoplegia, and white matter changes on magnetic resonance imaging (MRI) of the brain, but no mental defect. Serum creatine kinase (CK) level was normal. Muscle biopsy revealed a dystrophic picture with a prominent inflammatory infiltrate mimicking inflammatory myopathy-typical histological findings in CMD. Immunostaining showed normal expression of merosin, alpha and beta-dystroglycans. Mutation analyses of calpain3, dysferlin, and SEPN1 genes were negative. An electron microscopy revealed the accumulation of abnormally enlarged mitochondria located under the sarcolemma. Measurement of respiratory chain enzyme activities did not reveal any biochemical defect and mitochondrial genetic studies, including sequencing of the entire mitochondrial genome, were unremarkable. Phenotypic presentation of our patient is very unusual and differs considerably from other CMD variants.

  • 10020.
    Voutilainen, Anna-Stina
    et al.
    University of Skövde, School of Life Sciences.
    Sunesson, Gustaf
    University of Skövde, School of Life Sciences.
    Mäns upplevelser av att drabbas av hjärtinfarkt: studie av självbiografier2008Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Being suffered by myocardial infarction is for many people a traumatic experience and problems can also occur in the daily life, for a long time after the infarction. The aim of the study was to analyse and describe experiences when suffering a myocardial infarction, by lived experience. Autobiographies were used to collect data. Data were analysed using qualitative content analysis. All of the autobiographies were written by men. The result is represented by four main categories; Become ill, The caring relation, Needs and Coping. In the acute care the informants’ did not have control of their situation and they had a feeling of being deserted to the caring staff. The experience could also be positive, like the possibility to be able to leave the responsibility for their health to the caring staff. There was a need of sharing experiences with fellow patients and there was also a need for professional nearness and distanced nearness and they coped with the situation by looking forward, to adjust oneself and to take one step at the time.

  • 10021.
    Voytovych, R.
    et al.
    LTPCM, ENSEEG, Inst. Natl. Polytech. de Grenoble, D.U. BP 75, F-38402, St-Martin-d'Heres Cedex, France.
    Ljungberg, Lennart Y.
    University of Skövde, School of Technology and Society.
    Eustathopoluos, Nikos
    LTPCM, ENSEEG, Inst. Natl. Polytech. de Grenoble, D.U. BP 75, F-38402, St-Martin-d'Heres Cedex, France .
    The role of adsorption and reaction in wetting in the CuAg–Ti/alumina system2004In: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 51, no 5, p. 431-435Article in journal (Refereed)
    Abstract [en]

    The additions of previous termTi to CuAgnext term eutectic is known to strongly promote previous termwetting on alumina.next term However, it is still not clear whether this improvement is due to newly formed previous termreactionnext term products or to previous termadsorption.next term The aim of this study is to clarify the previous termrolenext term of interfacial previous termreactions on wettingnext term using new data generated by sessile drop experiments.

  • 10022.
    Vrasdonk, Emke
    et al.
    Chalmers University of Technology.
    Palme, Ulrika
    Chalmers University of Technology.
    Lennartsson, Tommy
    Swedish University of Agricultural Sciences, Uppsala.
    Antonelli, Alexandre
    University of Gothenburg.
    Berg, Sofia
    University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre.
    Jonsson, Annie
    University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre.
    Cederberg, Christel
    Chalmers University of Technology.
    Defining the reference situation for biodiversity in Life Cycle Assessments: Review and recommendations2016Conference paper (Refereed)
  • 10023.
    Vujicic, Sanja
    et al.
    Univ Gothenburg, Ctr Tourism, Sch Business Econ & Law, Gothenburg, Sweden .
    Wickelgren, Mikael
    University of Skövde, School of Technology and Society.
    Destination Branding in Relation to Airports: The Case of the City of Valencia2011In: European Journal of Transport and Infrastructure Research, ISSN 1567-7133, E-ISSN 1567-7141, Vol. 11, no 3, p. 334-345Article in journal (Refereed)
    Abstract [en]

    This study investigates various factors that contribute to the success of destination branding efforts where success is defined as the increase in airplane passenger numbers to a destination and its linked air transportation. Drawing on in-depth interviews and snowball sampling, the study examines the roles of many of the key actors involved in the efforts to increase passenger numbers. Using the City of Valencia in Spain as a case study, the role of its airport is examined as a factor of particular interest. The study concludes that Valencia has positioned itself among neighbouring destinations on the Spanish Mediterranean coast by its focus on high profile events and cultural tourism. However, other actors have taken a more active role in the effort to increase the number of tourists than the Valencia Airport that has taken a more passive role. Another finding is that the persistence in seeking resources for the costly branding efforts was another influential factor that explains the increase in Valencia tourism.

  • 10024.
    Vuoluterä, Fredrik
    et al.
    University of Skövde, School of Engineering Science.
    Carlén, Oliver
    University of Skövde, School of Engineering Science.
    Analysis of material flow and simulation-based optimization of transportation system: The combination of simulation and Lean to evaluate and design a transportation system2018Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The thesis has been performed in cooperation with a Swedish manufacturing company. The manufacturing site of the company is currently implementing a new machine layout in one of its workshops. The new layout will increase the product flow to another workshop on the site. The goal of the thesis was to evaluate the current transportation system and suggest viable alternatives for the future product flow. By means of discrete event simulation these alternative solutions would be modelled and subsequently optimized to determine if their performance is satisfactory. An approximated investment cost of the solutions would also be estimated.

    By performing a literature review and creating a frame of reference, a set of relevant methodologies were selected to provide a foundation to the project. Following these methodologies, the current state of transportation was identified and mapped using Value Stream Mapping. Necessary data from the current flow was identified and collected from the company computer systems. This data was deemed partly inaccurate and further verification was needed. To this end, a combination of Genchi Genbutsu, assistance from onsite engineers and a time study was used to verify the unreliable data points. The data sets from the time study and the company data which was deemed valid were represented by statistical distributions to provide input for the simulation models.

    Two possible solutions were picked for evaluation, an automated guided vehicle system and a tow train system. With the help of onsite personnel, a Kaizen Event was performed in which new possible routing for the future flow was evaluated. A set of simulation models portraying the automated guided vehicle system and the tow train system were developed with the aid of simulation software. The results from these models showed a low utilization of both systems. A new set of models were developed, which included all the product flows between the workshops. The new flows were modelled as generic pallets with the arrival distribution based on historical production data. This set of models were then subject for optimization with regard to the work in process and lead time of the system. The results from the optimization indicates the possibility to reduce the overall work in process by reducing certain buffer sizes while still maintaining the required throughput. These solutions were not deemed to be ready for implementation due to the low utilization of the transportation systems. The authors instead recommend expanding the scope of the system and including other product flows to reach a high utilization.

  • 10025.
    Vuorio, Tina
    et al.
    Department of Family Medicine, Institute of Clinical Medicine, University of Turku and Turku University Hospital, Turku, Finland.
    Suominen, Sakari
    University of Skövde, School of Health and Education. University of Skövde, Health and Education. Department of Public Health, University of Turku, Turku, Finland.
    Kautiainen, Hannu
    Folkhälsan Research Center, Helsinki, Finland / Unit of Primary Health Care, Kuopio University Hospital, Kuopio, Finland.
    Korhonen, Päivi
    Department of Family Medicine, Institute of Clinical Medicine, University of Turku and Turku University Hospital, Turku, Finland / Health Center of Harjavalta, Central Satakunta Health Federation of Municipalities, Harjavalta, Finland.
    Determinants of sickness absence rate among Finnish municipal employees2019In: Scandinavian Journal of Primary Health Care, ISSN 0281-3432, E-ISSN 1502-7724, Vol. 37, no 1, p. 3-9Article in journal (Refereed)
    Abstract [en]

    Objective: In addition to acute health problems, various aspects of health behavior, work-related and sociodemographic factors have been shown to influence the rate of sickness absence. The aim of this study was to concomitantly examine factors known to have an association with absenteeism. We hypothesized the prevalence of chronic diseases being the most important factor associated with sickness absence. Design: A cross-sectional study. Setting: Occupational health care in the region of Pori, Finland. Subjects: 671 municipal employees (89% females) with a mean age of 49 (SD 10) years. Information about the study subjects was gathered from medical records, by physical examination and questionnaires containing information about physical and mental health, health behavior, work-related and sociodemographic factors. The number of sickness absence days was obtained from the records of the city of Pori. Main outcome measures: The relationship of absenteeism rate with sociodemographic, health- and work-related risk factors. Results: In the multivariate analysis, the mean number of chronic diseases (IRR 1.24, 95% CI 1.13 to 1.36), work ability (IRR 0.83, 95% CI 0.76 to 0.91), and length of years in education (IRR 0.90, 95% CI 0.85 to 0.95) remained as independent factors associated with absenteeism. Conclusion: According to our results, chronic diseases, self-perceived work ability and length of years in education are the most important determinants of the rate of sickness absence. This implies that among working-aged people the treatment of chronic medical conditions is also worth prioritizing, not only to prevent complications, but also to avoid sickness absences. KEY POINTS Various sociodemographic, health- and work- related risk factors have been shown to influence sickness absence. The study aimed to find the most important determinants of absenteeism among several known risk factors in Finnish municipal employees. Chronic diseases, self-perceived work ability and education years remained as the most important determinants of sickness absence rates. Treatment of chronic medical conditions should be prioritized in order to reduce sickness absence rate. © 2019, © 2019 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.

  • 10026.
    Wadman, Ewelina
    et al.
    University of Skövde, School of Life Sciences.
    Johansson, Carina
    University of Skövde, School of Life Sciences.
    Svårigheter och möjligheter i mötet mellan sjuksköterska och patient med övervikt eller fetma.: En litteraturöversikt2009Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Fetma är ett ökande folkhälsoproblem runt om i världen. Sjuksköterskan har som uppgift att förebygga ohälsa hos patienter. Genom att veta patienternas svårigheter och möjligheter underlättar det mötet med sjuksköterskan. Men samtidigt måste sjuksköterskan vara medveten om sina attityder för att skapa en bra relation genom att samtala. Syftet är att beskriva svårigheter och möjligheter som kan påverka mötet mellan sjuksköterskor och patienter med övervikt eller fetma. Resultatet av litteraturöversikten bygger på 11 vetenskapliga artiklar. Dessa hittades både genom en systematisk sökning av databasen Cinahl och genom manuell sökning. Resultatet visar att sjuksköterskor har svårigheter att jobba med patienter med övervikt som inte har någon motivation. Sjuksköterskor bör också vara uppmärksamma på hur de uttrycker sig och bemöter patienter med övervikt. Sjuksköterskor och patienter har olika erfarenheter av varandra i mötet. Vilket kan ge en dålig start för en bra relation.

  • 10027.
    Waern, Jimmy
    University of Skövde, Department of Computer Science.
    Säkerhetens betydelse för elektronisk handel1999Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [sv]

    Detta examensarbete behandlar ämnet elektronisk handel på Internet och fokuserar på uppfattningar kring säkerheten inom detta område.

    Elektronisk handel på Internet är fortfarande en relativt ny företeelse som snabbt sprider ut sig. Trots detta finns det vissa faktorer som hämmar utvecklingen inom området. En av dessa faktorer är att säkerheten i samband med Internethandeln inte uppfattas som tillräckligt hög av potentiella kunder. Detta examensarbete undersöker hur uppfattningarna om säkerheten i samband med Internethandel ser ut i dagsläget.

    För att erhålla svar på min problemställning har jag dels intervjuat ett antal företag och dels ett antal privatpersoner.

    Jag har kommit fram till att företag som idkar Internethandel anser att deras tjänster är tillräckligt säkra i dagsläget. Privatpersonerna däremot, anser att det inte går att lita på säkerheten hos alla företag på Internet. För att lösa detta krävs att allmänheten på något sätt blir medveten om att säkerheten är tillräckligt hög, som den också är enligt företagen själva.

  • 10028.
    Wahlbäck, Emmy
    University of Skövde, School of Humanities and Informatics.
    Online Roleplaying: Collaborative storytelling in an MMORPG2011Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Rollspel kan ske i många olika former, och rollspelandet online erbjuder spelare en 

    mängd olika möjligheter för interakton och socialt samspel. Hur går rollspelet tll och 

    hur påverkar det spelarna som deltar? Den här studien tar upp hur rollspel i et 

    MMORPG kan gå tll, hur det kan användas i skapande utanför spelets gränser samt 

    hur de deltagande ser på sin egen medverkan i skapandet av en berätelse genom 

    rollspel. Undersökningen har gåt ut på at under en td delta i rollspel för at sedan 

    använda de intryck och händelser som sket inom spelets ramar för at skriva en text. 

    Därefer har rollspelare intervjuats angående en rad olika områden som berör 

    rollspel och hur de ser på det. Slutligen så sammanfatas spelarnas egna upplevelser 

    och de slutsatser som kan dras utfrån dessa kan användas som en grund inför 

    fortsata studier angående rollspel online. 

  • 10029.
    Wahlbäck, Johan
    University of Skövde, School of Humanities and Informatics.
    Ikonisk karaktärsdesign: utvecklande av karaktärsdesign i ett konvergent mediasamhälle2010Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    I mitt examensarbete så har jag undersökt hur väl det lämpar sig att använda sig avtydliga grafiska ikoner för att skapa en karaktärsdesign som är tydligt identifierbar, oavsett grafisk stil. Jag har fokuserat på den första fasen, koncepttecknandet i detta arbete.

    koncepttecknandet valdes som metod eftersom detta är det första steget i de flesta produktioner och det är i just denna fas man kan effektivisera arbetet även långt fram iproduktionen.

    Metoden som jag använt är att studera dvd:er från Gnomon Workshop och Massive Black för att undersöka hur olika, väl etablerade konceptartister, går till väga för att undersöka grafiska stilar eller hur de förhåller sig till utmärkande element i karaktärsdesign inom en produktion. Jag har sedan utfört ett praktiskt arbete där jag skapat tre karaktärsdesigner inom tre grafiska stilar. Dessa designer har sedan konverterats till de två stilar de inte har sitt ursprung inom.

    Konverteringarna utvärderas sedan genom intervjuer med respondenter där de får granska designerna och sätta poäng på hur väl de identifierar karaktärsdesignerna mellan de grafiska stilarna.

    Jag kommer fram till att fler ikoner bidrar till en större identifierande faktor då man skapar karaktärer och konverterar dessa till andra stilar samt att tre är det minsta antalet ikoner är lämpligt att använda då man vill skapa en tydligt identifierbar karaktär, oavsett grafisk stil.

  • 10030.
    Wahlgren, Elin
    et al.
    University of Skövde, School of Life Sciences.
    Karlsson, Emma
    University of Skövde, School of Life Sciences.
    Sjuksköterskans kunskap i vården av patienter med HIV.: En litteraturöversikt om sjuksköterskans kunskap och dess betydelse i vården av patienter med HIV-smitta.2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Background: HIV is a global problem, about 30-36 million people have the disease. Generally, people with HIV infection have worse health and sense of coherence, the need for information has health-related effects on patients.

    Purpose: The purpose is to describe nurses' knowledge and its importance in the care of patients with HIV infection.

    Method: The study consists of a literature review with thirteen articles of both quantitative and qualitative approach.

    Results: Nurses have the will and believe they need to learn more about the disease. Positive attitudes towards patients are associated with better knowledge. Education about HIV reduces fear and gives nurses greater understanding of discrimination and stigmatization.

    Conclusion: The knowledge of nurses is important in the care of patients with HIV infection; it manifests itself in attitudes and positions, as well as fear and stigma. Knowledge reduces the fear of nurses, leading to good health care for patients. The nurse's awareness that behavior affects stigma means that health is likely to increase in the patients.

  • 10031.
    Wahlgren, Emma
    et al.
    University of Skövde, School of Health and Education.
    Larsson, Therese
    University of Skövde, School of Health and Education.
    Förstföderskors upplevelser av socialt stöd under graviditet2016Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Background: One of the major events in human life is childbearing and the transition to becoming a parent.  It is a momentous time when women are especially vulnerable and the possibility of increased support should be available to create conditions for health and wellbeing. According to previous research, there is a clear correlation between perceived social support and numerous health benefits. Problem: However, there is barely research on pregnant women's experiences of social support during pregnancy. Aim: The aim of this study was to describe pregnant women's experiences of social support before childbirth and parenting. Method: A qualitative content analysis with an inductive approach was used as a method. Semi-structured telephone interviews were conducted and totally 15 first-time pregnant women were included in the study. Results: The results are presented in three categories with an overall theme. The result showed that social support during pregnancy had a keyrole in women's experiences of mental preparation and security for childbirth and parenthood. Conclusion: The women described the social support like a big puzzle, where each piece of the puzzle of social support contributed to a complete puzzle of mental preparation. Professional support, through for example, midwives, could facilitate social support. To meet the needs of pregnant women it is important that the professional who comes in contact with them are aware of how they can provide support, in order to facilitate social support.

  • 10032.
    Wahlgren, Emma
    et al.
    University of Skövde, School of Life Sciences.
    Sporrong, Sebastian
    University of Skövde, School of Life Sciences.
    LIVET EFTER EN HJÄRTINFARKT: en studie om patienters upplevelser2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    A great number of people suffer yearly from myocardial infarction (MI) and it´s the most common cause of death within cardiovascular disease. An MI often strikes suddenly and the patient is often unprepared, yet the diagnosis will interfere with the victim for the rest of their life. Knowledge about this illness has steadily increased but more has to be researched concerning the patients experience of their illness. The aim of this study is to describe patient experiences after an MI. The research method is a literature review, which consists of ten qualitative articles. The result is presented in five different themes: A changed approach to life, To accept or deny your illness, To make change in your lifestyle, The importance of personal support and information and To get a second chance. Most people experiences are different to each other and they cope with this change in different ways. Personal support is important but the support from medical society is often not optimal. Some people look at life in a positive way and find that their new way of life is rewarding, but others find their new situation to be scary and restrained. Thus patients experience recovery after an MI quite differently and our conclusion is that the support to patients should be individualized and often life-long.

  • 10033.
    Wahlman, Kim
    University of Skövde, School of Informatics.
    Procedurellt genererade grottnivåer: En jämförelse mellan cellulära automater och diffusionsbegränsad aggregation2016Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
  • 10034.
    Wahlman, Kim
    University of Skövde, School of Informatics.
    Serious Platform Games: A comparative study between a serious game and a conventional method2017Independent thesis Advanced level (degree of Master (One Year)), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    A big problem in the world today is vaccine hesitancy (VH), a tool to combat this could be to use serious games (SG) as a tool for education. There has been some research into this field, these studies have mainly used a single game or looked at a series of games, and they have required quite a lot of interaction. A trivia can allow the player to focus on thinking rather than performing various tasks; even if both can be equally educational.

    In this work a platform game was developed and used together with a questionnaire to test the knowledge of the common person in regard to vaccines and vaccine preventable diseases. 20 people participated in this study, 10 in a control group and 10 in the game group.

    The results in this study show that there was no significant statistical difference between a serious platform game and a compendium when it comes to learning.

  • 10035.
    Wahlstedt, Jonas
    University of Skövde, School of Humanities and Informatics.
    Tids- och verklighetsuppfattning genom sceneri i virtuella miljöer2012Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Arbetets syfte är att undersöka berättelseformer i datorspel baserade på tillämpningen av sceneri, avgränsat till spelarens uppfattning av tid och plats. Utifrån de svårigheter som förknippas med framställningen av naturligt förfall och framställningen av teknologiska möjligheter har två hypoteser formulerats; då att spelaren främst skapar sig en uppfattning om spelets tidsperiod utifrån upplevt artificiella objekt, samt att spelaren främst skapar sig en uppfattning om spelets verklighetsförankring utifrån spelets miljö. För undersökningens syfte har en virtuell miljö framställts i tre olika versioner, de två första avsedda att testa arbetets hypoteser avskilt, den senare avsedd att testa båda i samma miljö. Undersökningen har skett genom testspelning av dessa av totalt 30 testdeltagare. Undersökningens resultat styrker arbetets hypoteser, då den första i högre grad än den andra, men påvisar även svårigheter förknippade med sammanförandet av de metoder som tillämpats.

  • 10036.
    Wahlstrand, Louise
    University of Skövde, School of Humanities and Informatics.
    Medhjälpar-AI i spel: Skapande av en dynamiskt anpassningsbar AI i spel med hjälp av en genetisk algoritm2012Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Medhjälpar-AI blir allt mer vanligt i dagens spel och främst används de som substitut till en mänsklig spelare i spel med olika typer av samarbetslägen. Det finns med andra ord ett behov att utforska detta område, både när det gäller olika AI-tekniker och metoder för förbättring av hur medhjälpar-AI:n upplevs. Genetiska algoritmer är en AI-teknik som simulerar evolution, vilket är användbart i flera områden. Det här arbetet undersöker om genetiska algoritmer kan fungera som basis till en medhjälpar-AI som anpassar sig efter spelarens prestation i realtid.

    Experimentmiljön som används är ett enkelt actionspel, där en spelare tillsammans med medhjälpare ska samla poäng. Beroende på en medhjälpares poäng i förhållande till spelaren, ändrar medhjälparen skicklighetsnivå dynamiskt under spelets gång.

    Utvärderingen visar att genetiska algoritmer fungerar bra som utgångspunkt till ändamålet. Med andra ord visar arbetet att genetiska algoritmer har god potential att fungera bra som grundstruktur för mer avancerad medhjälpar-AI.

  • 10037.
    Wahlström, Jon
    University of Skövde, School of Informatics.
    ESTETISK VÄGPLANERING: Prestanda hos A*PS och Theta*2015Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Arbetet undersöker prestanda och estetik hos A*PS och Theta* inom olika miljötyper, där miljötyper är ett generaliserat begrepp för spelmiljöer och innefattar en struktur samt ett antal blockerande objekt. Båda teknikerna är varianter av A*-algoritmen och används för att åstadkomma estetisk vägplanering. Vägplanering innebär att finna en kortaste väg från en punkt A till en punkt B i en graf. En populär grafrepresentation i spel är rutnät med blockerande och icke-blockerande noder. Ett problem med rutnät är att algoritmerna tenderar att planera sina vägar längst med kanterna och därav resultera i sicksackformade vägar. A*PS och Theta* löser detta genom att utföra estetiska optimeringar som tillåter vägplaneringen att göras längst med grafens kanter, men samtidigt inte låta vägarna begränsas till att direkt följa dessa. Med experiment visar arbetet att Theta* i majoriteten av fallen hittar kortare och mer realistiska vägar. Vidare föreslås framtida arbeten inom området.

  • 10038.
    Wahlström, Malin
    University of Skövde, School of Informatics.
    Persona: Metod för att validera personor ta fram användbara personor i en statlig myndighet2017Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Migrationsverkets ökade intresse för User experience design i ett nytt projekt innebär stora möjligheter för användbarhet inom statliga myndigheter, men kräver att nya metoder och verktyg testas innan de kan införas. Bland annat är kontakt med användarna någonting Migrationsverket vill fortsätta med och förbättra i användbarhetssyfte. Detta arbete har i syfte att validera en persona av handläggare på Tillståndsenheter där handböcker ska omformas samt att hypotespröva en metod för att ta fram valida personor som lämpar sig i statliga myndigheter. En persona är en fiktiv version av den typiska användaren som tagits fram utifrån riktiga användare. Personorna som togs fram var av varierande kvalitet och lämpade för olika syften. En alternativ metod för att skapa personor med hög kvalitet togs fram genom att förse deltagare med mer information i en annan workshop. Resultatet visade att genom att förmedla bra information till deltagare kan de skapa representativa personor även när de inte närvarat vid datainsamling. Avslutningsvis ges fyra riktlinjer som kan följas för att öka kvaliteten på personan även när skaparen inte är samma person som den som intervjuar och analyserar. Riktlinjerna är att låta den som utfört intervjuerna med användare ta fram kategorier och underkategorier för personan, låta gruppen som ska använda personan skapa den åt sig själva, skapa fler än en persona för olika användare och hoppa över de attribut som inte finns behov av att använda. 

  • 10039.
    Wahlström, Ole
    University of Skövde, School of Informatics.
    Valörers betydelse i spel: En studie om att upptäcka föremål2018Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Studiens fokus var att undersöka hur olika nivåer av valörer, påverkar tiden det tar att upptäcka objekt i spel. Områden som hur kontraster och immersion kan påverka detta tas upp, likaså hur affordance påverkar hur lätt en spelare anpassar sig efter de förutsättningar som ett spel erbjuder. En spelbar mod skapades för att undersöka om korrigerade valörer på några modifierade vapen kunde visa på några tendenser i hur lång tid olika valörer tar att upptäcka. Den tid det tog varje informant att hitta sagda vapen, jämfördes med den totala tid som varje vapen fanns på skärmen innan upptäckt. Resultatet pekade sedan mot att ljusare valörer gjorde det lättare att upptäcka objekt, medan mörkare valörer gjorde det svårare. Ett fortsatt framtida arbete skulle gynnas av fler informanter och fler spelmiljöer för att få ett mer trovärdigt resultat.

  • 10040.
    Wahlström, Therese
    University of Skövde, Department of Computer Science.
    EDI: en studie i grossistmiljö2001Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [sv]

    Detta examensarbete behandlar ämnet EDI (Electronic Data Interchange) och fokuserar på relationen mellan en grossist och dess leverantörer. EDI är ett sätt att elektroniskt överföra standardiserade dokument på, från ett datasystem till ett annat, utan eller med begränsad mänsklig inblandning.

    Arbetets syfte är att belysa viktiga aspekter angående EDI-förfarandet hos en stor grossist. Aspekter som behandlas avser det maktförhållande och krav som råder mellan en grossist och dess leverantörer, såsom att införa EDI eller inte, utnyttjandet av EDI, hur makten är fördelad samt hur framtiden påverkar. Undersökningen baseras på intervjuer från sex leverantörer till en grossist och en intervju med grossisten.

    EDI används i första hand till att hjälpa företagen att rationalisera sin verksamhet. Främst är det administrativ tid som sparas, felfrekvensen som minskas och möjligheter att göra en strategisk satsning som är huvudvinsterna. Problem kan vara att det blir ett överflöd av personal efter ett EDI-införande.

  • 10041.
    Wakadkar, Sachin
    University of Skövde, School of Life Sciences.
    Analysis of transmembrane and globular protein depending on their solvent energy2009Independent thesis Advanced level (degree of Master (Two Years)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The number of experimentally determined protein structures in the protein data bank (PDB) is continuously increasing. The common features like; cellular location, function, topology, primary structure, secondary structure, tertiary structure, domains or fold are used to classify them. Therefore, there are various methods available for classification of proteins. In this work we are attempting an additional method for making appropriate classification, i.e. solvent energy. Solvation is one of the most important properties of macromolecules and biological membranes by which they remain stabilized in different environments. The energy required for solvation can be measured in term of solvent energy. Proteins from similar environments are investigated for similar solvent energy. That is, the solvent energy can be used as a measure to analyze and classify proteins. In this project solvent energy of proteins present in the Protein Data Bank (PDB) was calculated by using Jones’ algorithm. The proteins were classified into two classes; transmembrane and globular. The results of statistical analysis showed that the values of solvent energy obtained for two main classes (globular and transmebrane) were from different sets of populations. Thus, by adopting classification based on solvent energy will definitely help for prediction of cellular placement.

     

  • 10042.
    Walander, Tomas
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Cohesive modelling of the temperature dependence of epoxy based adhesives in Mode I and Mode II loading2013Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    In this work, the influence of the temperature on the cohesive laws for two epoxy adhesives is studied at temperatures below the glass transition temperature for both Mode I and Mode II loading. Cohesive laws are measured experimentally under quasi-static loading conditions in the temperature range -30≤T≤80"C" . Three parameters of the cohesive laws are studied in detail: the elastic stiffness, the peak stress and the fracture energy. Methods for determining the elastic stiffness in Mode I and Mode II are derived and evaluated. With these methods, the results in this work show that it is possible to measure all three parameters for each pure mode loading case by the use of only the DCB- and the ENF-test specimens. Even though the measures tend to spread in values, this can significantly reduce the cost for performing experiments. It is shown that most of the cohesive parameters are decreasing with an increasing temperature in both loading modes and for both adhesives. An exception is the Mode I fracture energy for one of the adhesives. This is shown to be independent of the temperature in the studied temperature range. For the same adhesive, the Mode II fracture energy is shown to be continuously decreasing with an increasing temperature. The experimental results are verified by finite element analyses. The simulations only consider uncoupled cohesive behaviours. By use of the experimental results, simplified bi-linear cohesive laws to be used at any temperature within the studied temperature range are derived for one adhesive in both loading modes. This is desired in order to simulate adhesively bonded structures that suffer a wide range in temperature.

  • 10043.
    Walander, Tomas
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre. Chalmers University of Technology.
    Influences of temperature, fatigue and mixed mode loading on the cohesive properties of adhesive layers2015Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    This thesis concerns some aspects that have influence on the strength of adhesive layers. The strength is determined by the stress deformation-relation of the layer. This relation is also referred to as cohesive law. The aspects having influence on the cohesive laws that are studied in this work are temperature, fatigue, multi-axial fatigue and mixed mode loading.

    For each aspect, a model is developed that can be used to describe the influence of the aspects on the cohesive laws numerically, e.g. by using the finite element method. These models are shown to give good agreement with the experimental results when performing simulations that aims at reproducing the experiments. For the aspect of temperature, a FE-model is suggested that can be used to simulate the mechanical behaviour in pure mode loadings at any temperature within the evaluated temperature span. Also, a damage law for modelling high cycle fatigue in a bonded structure in multi-axial loading is presented. Lastly, a new experimental set-up is presented for evaluating strength of adhesives during mixed mode loading. The set-up enables loading with a constant mode-mix ratio and by the experimental results, a potential model for describing the mechanical behaviour of the evaluated adhesive is presented.

  • 10044.
    Walander, Tomas
    University of Skövde, School of Technology and Society.
    System for measurement of cohesive laws2009Independent thesis Advanced level (degree of Master (One Year)), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    In this thesis an experimental method to calculate cohesive characteristics for an adhesive layer in a End Notched Flexure (ENF) specimen is presented and evaluated. The method is based on the path independent J-integral where the energy release rate (ERR) for the adhesive is derived as a function of the applied forces and the rotational displacements at the loading point and at the supports of the specimen. The major advantage with the method in comparison with existing theory known by the job initiator is that it is still applicable with ENF specimens that are subjected to yielding of the adherends.

    The structure of this thesis is disposed so that the theory behind the J-integral method is shortly described and then an evaluation of the method is performed by aid of finite element simulations using beam and cohesive elements. The finite element simulations indicates that the ERR can be determined with good accuracy for an ENF specimen where a small scale yielding of the adherends has occurred. However when a fully cross sectional yielding of the adherends is reached the ERR starts diverging from the exact value and generates a too high ERR according to input data in the simulations, i.e. the exact values. The importance in length of the adhesive process zone is also shown to be irrelevant to the ERR measured according to the J-integral method.

    Simulation performed with continuum elements indicates that a more reality based FE- simulation implies a higher value of the applied load in order to create crack propagation. This is an effect of that the specimen is allowed to roll on the supports which makes the effective length between the supports shorter than the initial value when the specimen is deformed. This results in a stiffer specimen and thus a higher applied force is needed to create crack propagation in the adhesive layer.

    An experimental set up of an ENF specimen is created and the sample data from the experiments are evaluated with the J-integral method. For measuring the rotational displacements of the specimen which are needed for the J-integral equation an image system is developed by the author and validated by use of linear elastic beam theory. The system calculates the three rotational displacements of the specimen by aid of images taken by a high resolution SLR camera and the system for measuring the rotations may also be used in other applications than for a specific ENF geometry. The validation of the image system shows that the rotations calculated by the image system diverge from beam theory with less than 2.2 % which is a quite good accuracy in comparison with the accuracies for the rest of the used surveying equipment.

    The results from the experiment indicates that the used, about 0.36 mm thick SikaPower 498, adhesive has an maximum shear strength of 37.3 MPa and a critical shear deformation of 482 µm. The fracture energy is for this thickness of the adhesive is determined as 12.9 kJ/m2.

    This report ends with a conclusion- and a suggested future work- chapter.

  • 10045.
    Walander, Tomas
    et al.
    University of Skövde, School of Technology and Society.
    Biel, Anders
    University of Skövde, School of Technology and Society.
    Stigh, Ulf
    University of Skövde, School of Technology and Society.
    An evaluation of the temperature dependence of cohesive properties for two structural epoxy adhesives2012In: 19th European Conference on Fracture, Kazan Scientific Centre of the Russian Academy of Sciences , 2012Conference paper (Refereed)
    Abstract [en]

    Cohesive modelling provides a more detailed understanding of the fracture properties of adhesivejoints than provided by linear elastic fracture mechanics. A cohesive model is characterized by astress-deformation relation of the adhesive layer. This relation can be measured experimentally.Two parameters of the stress-deformation relation are of special importance; the area under thecurve, which equals the fracture energy, and the peak stress. The influence of temperature of theseparameters is analyses experimentally and evaluated statistically for two structural epoxy adhesivesin the span from of -40°C to +80°C. The adhesives are used by the automotive industry and atemperature span below the glass transition temperature is considered. The results show that thattemperature has a modest influence on the adhesives Mode I fracture energy. For one of theadhesives, the fracture energy is independent of the temperature in the evaluated temperature span.In mode II, the influence of temperature is larger. The peak stresses decreases almost linearly withan increasing temperature in both loading cases and for both adhesives.

  • 10046.
    Walander, Tomas
    et al.
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Biel, Anders
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Stigh, Ulf
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Temperature dependence of cohesive laws for an epoxy adhesive in Mode I and Mode II loading2013In: International Journal of Fracture, ISSN 0376-9429, E-ISSN 1573-2673, Vol. 183, no 2, p. 203-221Article in journal (Refereed)
    Abstract [en]

    The influence of the temperature on the cohesive laws for an epoxy adhesive is studied in the glassy region, i.e. below the glass transition temperature. Cohesive laws are derived in both Mode I and Mode II under quasi-static loading conditions in the temperature range C. Three parameters of the cohesive laws are studied in detail: the elastic stiffness, the peak stress and the fracture energy. Methods for determining the elastic stiffness in Mode I and Mode II are derived and evaluated. Simplified bi-linear cohesive laws to be used at any temperature within the studied temperature range are derived for each loading mode. All parameters of the cohesive laws are measured experimentally using only two types of specimens. The adhesive has a nominal layer thickness of 0.3 mm and the crack tip opening displacement is measured over the adhesive thickness. The derived cohesive laws thus represent the entire adhesive layer as having the present layer thickness. It is shown that all parameters, except the Mode I fracture energy, decrease with an increasing temperature in both loading modes. The Mode I fracture energy is shown to be independent of the temperature within the evaluated temperature span. At C the Mode II fracture energy is decreased to about 2/3 of the fracture energy at C. The experimental results are verified by finite element analyses.

  • 10047.
    Walander, Tomas
    et al.
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Eklind, Alexander
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Carlberger, Thomas
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Stigh, Ulf
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Fatigue damage of adhesive layers: experiments and models2014In: Procedia Materials Science, ISSN 2211-8128, Vol. 3, p. 829-834Article in journal (Refereed)
    Abstract [en]

    Mode I fatigue crack growth at load levels close to the threshold is studied with the aim of improving the understanding of the fatigue properties. We also aim at identifying a suitable damage evolution law for large-scale simulation of built-up structures. A fatigue test rig is designed where up to six specimens are tested simultaneously. Each specimen is evaluated separately indicating the specimen-to-specimen variation in fatigue properties. A rubber-based and a PUR-based adhesive are tested. The two adhesives represent adhesives with very different material properties; the rubber adhesive is a stiff structural adhesive and the PUR adhesive is a soft modular adhesive. The experiments are first evaluated using a traditional Paris’ law approach. Inspired by an existing damage evolution law, a modified damage evolution law is developed based on only three parameters. The law is implemented as a user material in Abaqus and the parameters are identified. The results from simulations show a very good ability to reproduce the experimental data. With this model of fatigue damage, a zone of damage evolves at the crack tip. The extension of this zone depends on the stiffness of the adherends; stiffer adherends leads to a larger damage zone. This means that the rate of crack growth depends on the stiffness of the adherends. Thus, not only the state at the crack tip governs the rate of crack growth. This is in contrast to the results of a model based on Paris’ law where only the state at the crack tip, through the energy release rate, governs the rate of crack growth. This indicates that the threshold value of the energy release rate may depend on the stiffness of the adherends.

  • 10048.
    Walander, Tomas
    et al.
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Eklind, Alexander
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Carlberger, Thomas
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Stigh, Ulf
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Rietz, Andreas
    Scania STC, Södertälje, Sweden.
    Prediction of mixed-mode cohesive fatigue strength of adhesively bonded structure using Mode I data2016In: International Journal of Adhesion and Adhesives, ISSN 0143-7496, E-ISSN 1879-0127, Vol. 66, p. 15-25Article in journal (Refereed)
    Abstract [en]

    A cohesive zone model is presented for analyzing the fatigue life of an adhesive joint in the range of 104–106 load cycles. The parameters of the model are derived from Mode I double cantilever beam experiments. Fatigue experiments with adhesively joined components from the automotive industry are performed, and the results from the experiments are compared to the results of simulations. The error in the predicted fatigue strength is of the same order as the statistical deviation of the fatigue experiments, indicating that the simulation method produces acceptable predictions of the fatigue strength for applications in e.g. early product development.

  • 10049.
    Waldemarson, Anna-Karin
    et al.
    University of Skövde, School of Technology and Society.
    Nilsson, Björn
    University of Skövde, School of Technology and Society.
    Kommunikation för ledare2005 (ed. 1)Book (Other academic)
  • 10050.
    Waldenby, Anna
    et al.
    University of Skövde, School of Life Sciences.
    Svanberg, Karin
    University of Skövde, School of Life Sciences.
    Hög köttkonsumtion och hur den kan påverka risken för folksjukdomar: en litteraturstudie baserad på kvinnor2012Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [en]

    Background:Our meat intake increases. Previous research has shown the connection between high meat intake, including cardiovascular disease and cancer. Information on appropriate diet to reduce the risk of endemic disease is limited. Research on health and disease in women is limited and, therefore, women's health must be taken seriously. Objective: The aim of the literature study was to investigate whether a high meat intake may influence risk of endemic diseases in women. Results: The results suggest a link between a high intake of red and processed meat and endemic diseases in women. Correlations have been found between high meat intake and breast cancer, diabetes and cardiovascular disease. Exchanges from the red and processed meat to other sources of animal protein and vegetables have been shown to reduce the risk of endemic diseases. Discussion: Advice on diet should be an important prevention strategy on endemic diseases. Advice on diet for women should include a low intake of red and processed meat and a diet rich in fruits, vegetables and protein from sources other than red and processed meat. Conclusion: Clear and consistent dietary guidelines should be developed to help reduce the endemic diseases of the female population.

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