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Sökning: WFRF:(Jonsson Anders) > Konferensbidrag > (2005-2009)

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  • Bivall Persson, Petter, 1979-, et al. (författare)
  • Designing and Evaluating a Haptic System for Biomolecular Education
  • 2007
  • Ingår i: IEEE Virtual Reality Conference, 2007. VR '07.. - Piscataway, NJ, USA : IEEE. - 1-4244-0906-3 ; s. 171-178
  • Konferensbidrag (refereegranskat)abstract
    • In this paper we present an in situ evaluation of a haptic system, with a representative test population, we aim to determine what, if any, benefit haptics can have in a biomolecular education context. We have developed a haptic application for conveying concepts of molecular interactions, specifically in protein-ligand docking. Utilizing a semi-immersive environment with stereo graphics, users are able to manipulate the ligand and feel its interactions in the docking process. The evaluation used cognitive knowledge tests and interviews focused on learning gains. Compared with using time efficiency as the single quality measure this gives a better indication of a system's applicability in an educational environment. Surveys were used to gather opinions and suggestions for improvements. Students do gain from using the application in the learning process but the learning appears to be independent of the addition of haptic feedback. However the addition of force feedback did decrease time requirements and improved the students understanding of the docking process in terms of the forces involved, as is apparent from the students' descriptions of the experience. The students also indicated a number of features which could be improved in future development.
  • Bivall Persson, Petter, 1979-, et al. (författare)
  • Evaluating the Effectiveness of Haptic Visualization in Biomolecular Education - Feeling Molecular Specificity in a Docking Task
  • 2006
  • Ingår i: 12th IOSTE Symposium. - Universiti Science Malaysia. - 983-2700-39-6 ; s. 745-752
  • Konferensbidrag (refereegranskat)abstract
    • Within the molecular life sciences extensive use is made of visual representations, ranging from sketches to advanced computer graphics, often used to convey abstract knowledge that is difficult for the student to grasp. This work evaluates a new visual and haptic (tactile/kinetic) tool for protein docking in an in situ learning situation by combining qualitative and quantitative methods, performing tests and interviews with students; all aiming at a proper inclusion of visualization tools into biomolecular education. Preliminary results indicate time gains, strong positive affective responses and learning gains from the tasks, however the influence of haptics needs further investigation.
  • Efsing, Pål, 1965-, et al. (författare)
  • 2007
  • Ingår i: 13th International Conference on Environmental Degradation of Materials in Nuclear Power Systems. - 978-160560059-8 - 978-160560059-8 ; s. 1353-1363
  • Konferensbidrag (övrigt vetenskapligt)abstract
    • In many nuclear power plants, areas of susceptible material in the reactor systems are replaced or mitigated. Many of the areas where the nickel-based weld metal Alloy 182 have been used, are not replaceable but need to be mitigated. One possibility to mitigate is to make known susceptible material non-accessible for the reactor coolant water by covering it with less susceptible materials. One such possibility that has been utilized frequently in the Swedish Boiling Water Reactor (BWR) fleet is in-lay welding of butt welds in the main circulation and feed water loops with the less susceptible Alloy 82, which has fewer reported failure cases under these conditions.The study focuses on the development of a Factor of Improvement between Alloy 182 and the replacement, Alloy 82 material. As part of this, a disposition curve under conditions relevant for Normal Water Chemistry, NWC, in the Swedish BWRs is presented.
  • Felsberg, Michael, 1974-, et al. (författare)
  • Exploratory Learning Strucutre in Artificial Cognitive Systems
  • 2007
  • Ingår i: International Cognitive Vision Workshop. - Bielefeld : eCollections.
  • Konferensbidrag (övrigt vetenskapligt)abstract
    • One major goal of the COSPAL project is to develop an artificial cognitive system architecture with the capability of exploratory learning. Exploratory learning is a strategy that allows to apply generalization on a conceptual level, resulting in an extension of competences. Whereas classical learning methods aim at best possible generalization, i.e., concluding from a number of samples of a problem class to the problem class itself, exploration aims at applying acquired competences to a new problem class. Incremental or online learning is an inherent requirement to perform exploratory learning.Exploratory learning requires new theoretic tools and new algorithms. In the COSPAL project, we mainly investigate reinforcement-type learning methods for exploratory learning and in this paper we focus on its algorithmic aspect. Learning is performed in terms of four nested loops, where the outermost loop reflects the user-reinforcement-feedback loop, the intermediate two loops switch between different solution modes at symbolic respectively sub-symbolic level, and the innermost loop performs the acquired competences in terms of perception-action cycles. We present a system diagram which explains this process in more detail.We discuss the learning strategy in terms of learning scenarios provided by the user. This interaction between user ('teacher') and system is a major difference to most existing systems where the system designer places his world model into the system. We believe that this is the key to extendable robust system behavior and successful interaction of humans and artificial cognitive systems.We furthermore address the issue of bootstrapping the system, and, in particular, the visual recognition module. We give some more in-depth details about our recognition method and how feedback from higher levels is implemented. The described system is however work in progress and no final results are available yet. The available preliminary results that we have achieved so far, clearly point towards a successful proof of the architecture concept.
  • Gustafsson, Mats, et al. (författare)
  • Factors influencing PM10 emissions from road pavement wear
  • 2009
  • Konferensbidrag (refereegranskat)abstract
    • Accelerated pavement wear is one of the major environmental disadvantages of studded tyres in northern regions and results in increased levels of PM10. Measurements of PM10 in a road simulator hall have been used to study the influence of pavement properties, tyre type and vehicle speed on pavement wear. The test set-up included three different pavements (one granite and two quartzite with different aggregate sizes), three different tyre types (studded, non-studded, and summer tyres) and different speeds (30-70 km h(-1)). The results show that the granite pavement was more prone to PM10 production compared to the quartzite pavements. Studded winter tyres yield tens of times higher PM10 concentrations compared to non-studded winter tyres. Wear from summer tyres was negligible in comparison. It was also shown that wear is strongly dependent on speed; every 10 km h(-1) increase yielded an increase of the PM10 concentration of 680 mu g m(-3) in one of the simulator experiments. (C) 2008 Elsevier Ltd. All rights reserved.
  • Höök, Fredrik, et al. (författare)
  • Supported lipid bilayers, tethered lipid vesicles, and vesicle fusion investigated using gravimetric, plasmonic, and microscopy techniques
  • 2008
  • Konferensbidrag (refereegranskat)abstract
    • This article summarizes our most recent contributions to the rapidly growing field of supported lipid assemblies with emphasis on current studies addressing both fundamental and applied aspects of supported lipid bilayer (SLB) and tethered lipid vesicles (TLVs) to be utilized in sensing applications. The new insights obtained from combining the quartz crystal microbalance with dissipation monitoring technique with surface plasmon resonance are described, and we also present recent studies in which nanoplasmonic sensing has been used in studies of SLBs and TLVs. To gain full control over the spatial arrangement of TLVs in both two and three dimensions, we have developed a method for site-selective and sequence-specific sorting of DNA-tagged vesicles to surfaces modified with complementary DNA. The combination of this method with nanoplasmonic sensing formats is covered as well as the possibility of using DNA-modified vesicles for the detection of unlabeled DNA targets on the single-molecule level. Finally, a new method for membrane fusion induced by hybridization of vesicle-anchored DNA is demonstrated, including new results on content mixing obtained with vesicle populations encapsulating short, complementary DNA strands.
  • Jonsson, Anders, et al. (författare)
  • Quantitative PCR detection for mapping in-field variation of Plasmodiophora and Aphanomyces euteiches
  • 2008
  • Ingår i: Journal of Plant Pathology.
  • Konferensbidrag (övrigt vetenskapligt)abstract
    • Spatial variability within fields and variations between fields in the occurrence of Plasmodiophora brassicae and of Aphanomyces euteiches were determined on farms in south and central Sweden using quantitative PCR-assays. The molecular methods are validated by traditional bioassay techniques. Soil has been sampled using GPS from fields where the disease occurred and the results presented as an interpolated disease map. Relations between the occurrence of pathogens and soil parameters such as pH, soil type, clay content, plant available macro- and micro nutrients are evaluated. Species-specific primers and TaqMan fluorogenic probes were designed to amplify small regions of P. brassicae and A. euteiches ribosomal DNA. Total genomic DNA was extracted and purified from soil samples using commercial kits. The amount of pathogen DNA was quantified using a standard curve generated by including reactions containing different amounts of a plasmid carrying the P. brassicae or A. euteiches target sequence. Regression analysis showed that the assays were linear over at least 6-7 orders of magnitude (R2>0.99) and that the amplification efficiency was >95%.A considerable (100-1000 times) variation in DNA–content was observed in the sampled fields for P. brassicae, less for A. euteiches. Molecular methods for routine diagnosis will enable producers to respond to market opportunities. The results will constitute basic data for an evaluation of the benefit of a systematic detection of soil borne pathogens by a quantitative PCR-method aiming at an efficient application in Precision Agriculture
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