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Sökning: swepub > Konferensbidrag > Göteborgs universitet

  • Resultat 1-10 av 16984
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  • Sou, Kin Cheong, et al. (författare)
  • Nonserial Dynamic Programming with Applications in Smart Home Appliances Scheduling - Part I : Precedence Graph Simplification
  • 2014
  • Ingår i: 2014 European Control Conference (ECC). - IEEE. - 978-3-9524269-1-3 ; s. 1643-1648
  • Konferensbidrag (refereegranskat)abstract
    • In this and a companion paper a dynamic programming (DP) approach to solve a smart home appliances scheduling problem is considered. The challenge with solving the scheduling problem is the coupling of decision variables due to some time precedence constraints. In general, the system of precedence constraints may contain redundant constraints that offer opportunities for simplification. This simplification is desirable for reducing the computation effort of the nonserial DP procedure presented in the companion paper (i.e., Part II). The current paper establishes the uniqueness of the maximum set of redundant constraints and its polynomial-time solvability with optimality guarantee, under the sufficient and necessary condition that the precedence graph (a graph representation of the precedence constraints system) does not contain any cycle with nonnegative weight. A numerical case study indicates the efficiency of the proposed simplification algorithm versus the brute-force enumerative search. Besides helping to reduce the computation effort in the DP procedure described in the companion paper, the algorithm in the current paper solves a generalization of a precedence graph simplification problem arising from application areas such as parallel computing.
  • Sarve, Hamid, 1981-, et al. (författare)
  • Registration of 2D Histological Images of Bone Implants with 3D SRuCT Volumes
  • 2008
  • Ingår i: SSBA 2008. - Lund : SSBA. ; s. 19-22
  • Konferensbidrag (övrigt vetenskapligt)abstract
    • To provide better insight in bone modeling andremodeling around implants, information is ex-tracted using different imaging techniques. Twotypes of data used in this project are 2D histologi-cal images and 3D SRuCT (synchrotron radiation-based computed microtomography) volumes. In thecase of the volumes, manual annotation is verytime consuming and difficult. To work around thisproblem is to register the volume with the 2D his-tological images, for which a ground truth is easierto create.In this paper, we present a 2D/3D intermodal reg-istration method for the mentioned purpose. Themethod compares the correspondence between anextracted 2D-slice from the volume and the histo-logical image using mutual information. The sliceis found using simulated annealing and matched tothe histological image using chamfer matching.
  • Löfhede, J., 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.
  • 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
    • OBJECTIVE Intrauterine 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. METHODS Fetal 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.). RESULTS Exposure 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. CONCLUSIONS These 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.
  • Wetter-Edman, Katarina, et al. (författare)
  • Experience and Expertise:Key Issues for Developing Innovation Capabilities Through Service Design
  • 2016
  • Ingår i: Servcie Design Geographies : Proceedings of the ServDes2016 Conference. - 978-91-7685-738-0 ; s. 516-521
  • Konferensbidrag (refereegranskat)abstract
    • Public organisations need to rethink the ways they innovate and improve their services. Service design has become a means to achieve innovation capabilities through service design projects with the purpose of both enhancing innovation capabilities, and creating new service. Based on observations, interviews and project documentations this exploratory paper reflects on the role and articulation of design expertise, how and if it may be transferred through design projects. Further, the relation between learning by doing and learning through expert examples is discussed through a pragmatist lens. 
  • Bergquist, Magnus, et al. (författare)
  • Open source programmers' strategies to cope with ideological tensions
  • 2009
  • Ingår i: International Conference on Organizational Learning, Knowledge and Capabilities (OLKC), 26-28 April 2009, Amsterdam, the Netherlands.
  • Konferensbidrag (refereegranskat)abstract
    • In this paper we analyse how the increased use of open source software in companies affect employed programmers’ work, which we theorize as part of a larger secularisation process. We have studied both companies based on a more traditional proprietary model who are becoming open source oriented, and SMEs built around open source business concepts. This change results in a need for professional programmers to re-interpret open source within a new business oriented context. We study what kind of strategies programmers develop to cope with these contradictory systems and how it changes work roles and programmers’ approaches towards open source community work.
  • 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.
  • Ekelin, Annelie, et al. (författare)
  • Enrolling Local Strategic Actors in Public Portal Development
  • 2011
  • Ingår i: Electronic Government : The 10th IFIP WG 8.5 International Conference on Electronic Government EGOV 2011, Proceedings. - Delft : Springer. - 978-3-642-22877-3 ; s. 247-258
  • Konferensbidrag (refereegranskat)abstract
    • Paper som beskriver formering av nätverk i samband med utveckling av en hälsoportal inom e-Government. En fallstudie med teoretiskt ramverk hämtat från Actor Network Theory (ANT). Diskuterar conceptet "enrolment devices" och dess tillämpning i komplex nätverkverksformation och behovet av lokalt stöd för en positiv utveckling av en hållbar projekt organisation.
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