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Sökning: WFRF:(Jonsson Anders) > Konferensbidrag

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  • Jonsson, Anders, et al. (författare)
  • When Acyclicity is not Enough: Limitations of the Causal Graph
  • 2013
  • Ingår i: Proceedings of the Twenty-Third International Conference on Automated Planning and Scheduling. - 978-1-57735-609-7. ; s. 117-125
  • Konferensbidrag (refereegranskat)abstract
    • Causal graphs are widely used in planning to capture the internal  structure of planning instances. In the past, causal graphs have been exploited to generate hierarchical plans, to compute heuristics, and  to identify classes of planning instances that are easy to solve. It  is generally believed that planning is easier when the causal graph is acyclic. In this paper we show that this is not true in the worst  case, proving that the problem of plan existence is PSPACE-complete  even when the causal graph is acyclic. Since the variables of the  planning instances in our reduction are propositional, this result  applies to STRIPS planning with negative pre-conditions. Having  established that planning is hard for acyclic causal graphs, we study  a subclass of planning instances with acyclic causal graphs whose  variables have strongly connected domain transition graphs. For this  class, we show that plan existence is easy, but that bounded plan  existence is hard, implying that optimal planning is significantly  harder than satisficing planning for this class.
  • Landström, Anders, et al. (författare)
  • Image reconstruction by prioritized incremental normalized convolution
  • 2011
  • Ingår i: Image analysis : 17th Scandinavian conference, SCIA 2011, Ystad, Sweden, May 2011 ; proceedings. - Berlin : Springer. - 978-3-642-21226-0 ; 176-185
  • Konferensbidrag (refereegranskat)abstract
    • A priority-based method for pixel reconstruction and incremental hole filling in incomplete images and 3D surface data is presented. The method is primarily intended for reconstruction of occluded areas in 3D surfaces and makes use of a novel prioritizing scheme, based on a pixelwise defined confidence measure, that determines the order in which pixels are iteratively reconstructed. The actual reconstruction of individual pixels is performed by interpolation using normalized convolution. The presented approach has been applied to the problem of reconstructing 3D surface data of a rock pile as well as randomly sampled image data. It is concluded that the method is not optimal in the latter case, but the results show an improvement to ordinary normalized convolution when applied to the rock data and are in this case comparable to those obtained from normalized convolution using adaptive neighborhood sizes.
  • Akambih Tajam, Joseph, et al. (författare)
  • 2010
  • Ingår i: ECO-TECH´10, 22-24 November 2010, Kalmar, Sweden : International Conference on Natural Sciences and Technologies for Waste and Wastewater Treatment, Remediation, Emissions Related to Climate, Environmentaland Economic Effects. ; s. 827-835
  • Konferensbidrag (övrigt vetenskapligt)abstract
    • Spillage of diesel oil and other petroleum products is a commonly creating need for siteremediation of contaminated soils. In Sweden the most common remediation action isexcavation of the contaminated soil and off site biological treatment by composting.However, a number of small sites spread out in rural areas end up low on priority lists, andwill not be attended to within foreseeable future if ever. For such areas a low cost, easy toapply remediation techniques would be of interest. Enhanced bioremediation of dieselcontaminants in soil by whey addition has been demonstrated in lab scale. Whey is a byproductfrom cheese production. A first pilot remediation trial on an actual site in Gäddede,County of Jämtland, was started the summer of 2010. Using this site as a case study ascreening life cycle assessment model has been set up. The goal of the study was toinvestigate the environmental performance of the whey method, to benchmark the wheymethod toward the excavation and composting practice and to identify environmental hotspots in the whey treatment life cycle. The study aims at establishing if further work shouldbe put into developing the method, or if the environmental performance is such that the wheymethod should be abandoned. It should be noted that even with a slightly worseenvironmental performance compared to other remediation alternatives whey treatment couldstill be of interest, since the small scale sites in rural areas we talk about here otherwise mostoften would not be attended to.Results from the screening life cycle assessment indicate a rather good environmentalperformance of the whey method, partly depending on impact category considered. For thewhey method, impacts from farming activities in the milk production chain allocated to thewhey give significant contributions. Transportation gives important impacts from both thewhey method and the excavation and off site composting, thus logistics should always beconsidered and optimized. The whey on-site treatment could be an interesting alternative forbioremediation especially at sites that would not otherwise be treated, due to small size orremote location.
  • 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 (print) ; 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 (övrigt vetenskapligt)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.
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