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  • Sarve, Hamid, et al. (författare)
  • Registration of 2D Histological Images of Bone Implants with 3D SR?CT Volumes
  • 2008
  • Ingår i: Advances in Visual Computing : 4th International Symposium, ISVC 2008, Las Vegas, NV, USA, December 1-3, 2008. Proceedings, Part I. - Heidelberg/Berlin : Springer. - 978-3-540-89638-8 ; s. 1071-1080
  • Konferensbidrag (refereegranskat)abstract
    • To provide better insight in bone modeling and remodeling around implants, information is extracted using different imaging techniques. Two types of data used in this project are 2D histological images and 3D SR?CT (synchrotron radiation-based computed microtomography) volumes. To enable a direct comparison between the two modalities and to bypass the time consuming and difficult task of manual annotation of the volumes, registration of these data types is desired.In this paper, we present two 2D-3D intermodal rigid-body registration methods for the mentioned purpose. One approach is based on Simulated Annealing (SA) while the other uses Chamfer Matching (CM). Both methods use Normalized Mutual Information for measuring the correspondence between an extracted 2D-slice from the volume and the 2D histological image whereas the latter approach also takes the edge distance into account for matching the implant boundary. To speed up the process, part of the computations are done on the Graphic Processing Unit.The results show that the CM-approach provides a more reliable registration than the SA-approach. The registered slices with the CM-approach correspond visually well to the histological sections, except for cases where the implant has been damaged.
  • Lindblad, Sverker, 1946-, et al. (författare)
  • Classroom Interaction in Changing Contexts: Positions and Practices Performed in Recordings from 1960s into 2000s.
  • 2011
  • Ingår i: AERA 2011 meeting program: Inciting the Social Imagination. - 0163-9676.
  • Konferensbidrag (refereegranskat)abstract
    • Firstly, for educational research and curriculum theory it is of vital importance to find ways to describe and analyze pedagogical processes over time and space. This is carried out here – over four decades and in specific and changing contexts, questioning the thesis of the persistence of recitation and the predominance of basic IRE-sequences. Second, relations between classroom interaction and social and organizational context is vital in curriculum theory and in educational theorizing. Classroom interaction is here conceptualized as a “social fact demanding historicization”. Given a communicative turn in understanding interaction we argue for a position of “contingent autonomy” of importance when designing studies of curriculum enactment and pedagogical devices opening up for more specific analyses. Thirdly, our study is based on the specific settings for classroom interaction presented as a Nordic welfare state education in transition, but point to the general importance of theorizing educational processes as changing social facts with their own qualities – of societal as well as political ingredients – giving new insights for curriculum theory as well as for educational policy analysis. Fourthly, we have highlighted the importance of reflexivity in research and in the construction of research objects as part of a communicative turn in education. This is also assumed to increase a socially robust communication of research in society.
  • Thordstein, Magnus, et al. (författare)
  • Effects of inflammation on cerebral electric activity in fetal sheep
  • 2008
  • Ingår i: 2nd Congress of the European Academy of Paediatrics, Nice 23-28 okt 2008.
  • Konferensbidrag (övrigt vetenskapligt)abstract
    • OBJECTIVEIntrauterine infections can by themselves induce fetal brain damage but also potentiate the effects of other harmful influences such as asphyxia and seizures. Using an EEG technique that permits the recording of extremely low frequencies, often called DC EEG, changes in the level, i.e. DC shifts can be detected. The DC level has been suggested to depend mainly on the potential over the blood brain barrier (BBB), in turn decided primarily by the arterial level of pCO2. Fetuses affected by infection/inflammation that produce detrimental effects on the brain, may have elevated levels of pCO2 and disturbance of the BBB. We aimed at investigating the possibility that the DC EEG could be used to detect the effects of inflammation on the fetal brain. METHODSFetal sheep were instrumented at 97 days of gestation with catheters, four active EEG electrodes placed on the dura mater as well as extracranial reference and ground electrodes. After three days of recovery, the bacterial endotoxin lipopolysaccharide (LPS) was given to the fetus (200 ng i.v.). RESULTSExposure to LPS induced a positive DC shift in parallel to the assumed affection of cerebral function and to the pCO2 elevation. This change was not always obvious in standard EEG. CONCLUSIONSThese recordings of fetal DC EEG appear to be the first to be done. They indicate that the effects of inflammation on cerebral function can be monitored by DC EEG. Such monitoring might be feasible also during late stages of labour and in neonates.
  • Bengtsson, Ulrika, et al. (författare)
  • Development of a mobile phone self-report system for persons with hypertension: focus group interviews with patients and providers
  • 2013
  • Ingår i: Kardiovaskulära Vårmötet 2013.
  • Konferensbidrag (refereegranskat)abstract
    • Introduction: Hypertension is a risk factor for cardiovascular disease for which poor adherence to therapy becomes a substantial threat to health. Major efforts have been made to explore reasons for poor adherence but few successful interventions have been designed. There is a need for effective strategies designed to facilitate an increased understanding for the complexity of hypertension and treatment by strengthening of patient participation as well as patient empowerment. Purpose / Methods: The aim of this study was to explore and describe relevant aspects of hypertension and hypertension treatment, from the perspective of persons with hypertension and health care providers. Focus group interviews were performed with 15 persons with hypertension and 12 health care providers and analysed according to thematic analysis. Results: Persons with hypertension perceived trust, relationship to providers, well-being and prevention of complications as important aspects of hypertension care. Further they sought to understand the interplay between symptoms and variation of blood pressure. The providers emphasised accessibility, clear and consistent counselling, prevention of complications and educational efforts but doubted patients’ ability to be participating partners in care. Conclusion: The study presents aspects that persons with hypertension and health care providers deem important in hypertension management. Our finding provides input for future outcome measures, such as self-reports and may serve as a foundation for the development of a self-report system for persons with hypertension. They may further facilitate patient empowerment by increasing the understanding of hypertension and its’ treatment, from a person-centred perspective.
  • Brown, Barry, et al. (författare)
  • Seeing Ethnographically: Teaching ethnography as part of CSCW
  • 2007
  • Ingår i: In L. J. Bannon, I. Wagner, C. Gutwin, R. H. R. Harper & K. Schmidt (Eds.), Proceedings of the 10th European Conference on Computer-Supported Cooperative Work. London: Springer. ; s. 411-430
  • Konferensbidrag (refereegranskat)abstract
    • While ethnography is an established part of CSCW research, teaching and learning ethnography presents unique and distinct challenges. This paper discusses a study of fieldwork and analysis amongst a group of students learning ethnography as part of a CSCW & design course. Studying the students’ practices we explore fieldwork as a learning experience, both learning about fieldsites as well as learning the practices of ethnography. During their fieldwork and analysis the students used a wiki to collaborate, sharing their field and analytic notes. From this we draw lessons for how ethnography can be taught as a collaborative analytic process and discuss extensions to the wiki to better support its use for collaborating around fieldnotes. In closing we reflect upon the role of learning ethnography as a practical hands on – rather than theoretical – pursuit.
  • Larsson, Per-Olof, 1948- (författare)
  • Arbete för personer med intellektuella funktionshinder
  • 2009
  • Ingår i: Forskningspresentation vid Arbetslivskonferens – Ett arbetsliv för alla 18-19 mars 2009 Mimerskolan i Umeå anordnad av Luleå kommun, Umeå Universitet, Regionalt Utvecklingscentrum vid Umeå Universitet och Umeå Kommun..
  • Konferensbidrag (övrigt vetenskapligt)
  • Larsson, Per-Olof, 1948- (författare)
  • Arbete för personer med utvecklingsstörning
  • 2009
  • Ingår i: Forskningspresentation ”Unga med Funktionshinder” med Arbetsförmedlingen, Socialtjänsten och Försäkringskassan i Göteborg Region Väster 5 mars 2009 om "Arbetsgivarens motiv att anställa och arbetskamraternas motiv att integrera personer med intellektuellt funktionshinder på arbetsplatsen"..
  • Konferensbidrag (övrigt vetenskapligt)
  • Löfhede, Johan, et al. (författare)
  • Detection of Bursts in the EEG of Post Asphyctic Newborns
  • 2006
  • Ingår i: 28th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. - 1557-170X. ; s. 2179-2182
  • Konferensbidrag (refereegranskat)abstract
    • Eight features inherent in the electroencephalogram (EEG) have been extracted and evaluated with respect to their ability to distinguish bursts from suppression in burst-suppression EEG. The study is based on EEG from six full term infants who had suffered from lack of oxygen during birth. The features were used as input in a neural network, which was trained on reference data segmented by an experienced electroencephalographer. The performance was then evaluated on validation data for each feature separately and in combinations. The results show that there are significant variations in the type of activity found in burst-suppression EEG from different subjects, and that while one or a few features seem to be sufficient for most patients in this group, some cases require specific combinations of features for good detection to be possible.
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