| 168801. |
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| 168802. |
- Magnusson, Lina, et al.
(författare)
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Wellbeing of persons with disabilities using lower limb assistive devices devices in low-income countries
- 2017
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Konferensbidrag (refereegranskat)abstract
- To understand what is required to improve prosthetic and orthotic provision and services for persons with disabilities in low-income countries, it is of interest to investigate their well-being in terms of quality of life, access to mobility, education, health, rehabilitation, work and employment and their experiences of attitudes in the society. Data was collected using WHOQOL questionnaires measuring quality of life from 277 participants in India. In addition to this, individual qualitative interviews were conducted with 16 participants in Nepal and 12 participants in Sierra Leone. Statistical analysis and qualitative content analysis was applied to the data.In India participants with disabilities scored significantly lower than the persons without disabilities in three of the four domains; physical health, psychological and environmental domain. In Sierra Leone and Nepal participants were limited by poverty that affects access to education, employment and health care and wanted increased independence. Prosthetic and orthotic devices are vital for people with physical disability and offer increased dignity. In Sierra Leone, traditional beliefs have a negative impact on people with physical disabilities and are a cause for discrimination. In Nepal participants stressed that access to education and vocational training had the potential to improve their living situation.
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| 168803. |
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| 168804. |
- Magnusson, Maria, et al.
(författare)
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3D Magnetic Resonance Imaging of the Human Brain - Novel Radial Sampling, Filtering and Reconstruction
- 2010
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Ingår i: Proc of the 12th IASTED International Conference on Signal and Image Processing (SIP 2010), August 23 - 25, 2010, Lahaina, Maui, USA. - Calgary, AB, Canada : ACTA Press. - 9780889868687 ; , s. Track: 710-042-(8 pages)
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Konferensbidrag (refereegranskat)abstract
- We have suggested a novel method PRESTO-CAN including radial sampling, filtering and reconstruction of k-space data for 3D-plus-time resolved MRI. The angular increment of the profiles was based on the golden ratio, but the number of angular positions N was locked to be a prime number which guaranteed fix angle positions.The time resolution increased dramatically when the pro-files were partly removed from the k-space using the hourglass filter.We aim for utilizing the MRI-data for fMRI, where the echo times are long, TE ≈ 37-40 ms. This will result in field inhomogeneities and phase variations in the reconstructed images. Therefore, a new calibration and correction procedure was developed. We show that we are able to reconstruct images of the human brain with an image quality in line with what can be obtained by conventional Cartesian sampling.The pulse sequence for PRESTO-CAN was implemented by modifying an existing PRESTO sequence for Cartesian sampling. The effort involved was relatively small and a great advantage will be that we are able to use standard procedures for speeding up data acquisition, i.e. parallel imaging with SENSE.
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| 168805. |
- Magnusson, Martin, 1977-, et al.
(författare)
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3D mapping the Kvarntorp mine : a rield experiment for evaluation of 3D scan matching algorithms
- 2008
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Ingår i: IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), Workshop.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- This paper presents the results of a field experiment in the Kvarntorp mine outside of Örebro in Sweden. 3D mapping of the underground mine has been used to compare two scan matching methods, namely the iterative closest point algorithm (ICP) and the normal distributions transform (NDT). The experimental results of the algorithm are compared in terms of robustness and speed. For robustness we measure how reliably 3D scans are registered with respect to different starting pose estimates. Speed is evaluated running the authors’ best implementations on the same hardware. This leads to an unbiased comparison. In these experiments, NDT was shown to converge form a larger range of initial pose estimates than ICP, and to perform faster.
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| 168806. |
- Magnusson, Martin, et al.
(författare)
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3D modelling for underground mining vehicles
- 2005
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Konferensbidrag (refereegranskat)abstract
- This paper presents the basis of a new system for making detailed 3D models of underground tunnels. The system is to be used for automated control of mining vehicles. We describe some alternative methods for matching several partial scans, and their applicability for making a complete model of a mine environment
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| 168807. |
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| 168808. |
- Magnusson, Martin, et al.
(författare)
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A comparison of 3D registration algorithms for autonomous underground mining vehicles
- 2005
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Konferensbidrag (refereegranskat)abstract
- The ICP algorithm and its derivatives is the de facto standard for registration of 3D range-finder scans today. This paper presents a quantitative comparison between ICP and 3D NDT, a novel approach based on the normal distributions transform. The new method ad- dresses two of the main problems of ICP: the fact that it does not make use of the local surface shape and the computationally demanding nearest-neighbour search. The results show that 3D NDT produces accurate results much faster, though it is more sensitive to error in the initial pose estimate.
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| 168809. |
- Magnusson, Martin, et al.
(författare)
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Abductive Reasoning with Filtered Circumscription
- 2009
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Ingår i: Proceedings of the <em>IJCAI-09 Workshop on Nonmonotonic Reasoning, Action and Change (NRAC)</em>. - Sydney : UTSePress. - 9780980284072
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Konferensbidrag (refereegranskat)abstract
- For logical artificial intelligence to be truly useful,its methods must scale to problems of realistic size.An interruptible algorithm enables a logical agentto act in a timely manner to the best of its knowledge,given its reasoning so far. This seems necessaryto avoid analysis paralysis, trying to thinkof every potentiality, however unlikely, beforehand.These considerations prompt us to look for alternativereasoning mechanisms for filtered circumscription,a nonmonotonic reasoning formalism usede.g. by Temporal Action Logic and Event Calculus.We generalize Ginsberg’s circumscriptive theoremprover and describe an interruptible theoremprover based on abduction that has been used tounify planning and reasoning in a logical agent architecture.
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| 168810. |
- Magnusson, Mikaela, 1992, et al.
(författare)
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Admitting sexual abuse against infants and preschoolers: Defendant statements in Swedish court cases
- 2017
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Ingår i: The European Association of Psychology and Law (EAPL) conference. Menchen, Belgium: 28-31 May.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Court proceedings concerning alleged child sexual abuse (CSA) against young children constitute a challenge for legal systems around the globe. Legal decision-makers are often faced with the difficult task of assessing likelihood of guilt based on oral testimonies and circumstantial evidence. Beyond the child’s testimony, a suspect confession can add vital information regarding the offence. The aim of the present study was to examine defendant statements during trial to explore factors related to admissions of guilt. Court cases (n = 117) were extracted from a larger data set containing official court documents on child sexual abuse offences against children seven years or younger. All court proceedings took place between January 2010 to December 2014 across Sweden. The archival data is currently being analyzed. Using logistic binary regression, factors from previous research on confessions during police interviews will be explored to predict admissions of guilt during trial. Furthermore, the defendants’ self-reported explanations behind the abuse allegation will be thematically analyzed to examine other aspects surrounding admissions of guilt. Findings and potential practical implications will be presented during the conference.
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