| 781. |
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| 782. |
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| 783. |
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| 784. |
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| 785. |
- Persson, Anders, 1953-, et al.
(author)
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A state-of-the-art pipeline for postmortem CT and MRI visualization: from data acquisition to interactive image interpretation at autopsy
- 2011
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In: Acta Radiologica. - London, United Kingdom : Sage Publications. - 0284-1851 .- 1600-0455. ; 52:5, s. 522-536
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Research review (peer-reviewed)abstract
- The importance of autopsy procedures leading to the establishment of the cause of death is well-known. A recent addition to the autopsy work flow is the possibility of conducting postmortem imaging, in its 3D version also called virtual autopsy (VA), using multidetector computed tomography (MDCT) or magnetic resonance imagining (MRI) data from scans of cadavers displayed with direct volume rendering (DVR) 3D techniques. The use of the data and their workflow are presented. Data acquisition was performed and high quality data-sets with submillimeter precision were acquired. New data acquisition techniques such as dualenergy CT (DECT) and quantitative MRI, then were implemented and provided additional information. Particular findings hardly visualized in conventional autopsy can rather easy be seen at the full body CT, such as air distribution, e.g. pneumothorax, pneumopericardium, air embolism, and wound channels. MRI shows natural deaths such as myocardial infarctions. Interactive visualization of these 3D data-sets can provide valuable insight into the corpses and enables non-invasive diagnostic procedures. In postmortem CT imaging, not being limited by a patient depending radiation dose limit the data-sets can, however, be generated with such a high resolution that they become difficult to handle in today’s archive retrieval and interactive visualization systems, specifically in the case of full body scans. To take full advantage of these new technologies the postmortem workflow needs to be tailored to the demands and opportunities that the new technologies allow.
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| 786. |
- Persson, Anders, 1975, et al.
(author)
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A unified analysis for coded DS-CDMA with equal-gain chip combining in the downlink of OFDM systems
- 2005
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In: IEEE Transactions on Communications. - 0090-6778 .- 1558-0857. ; 53:2, s. 289-298
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Journal article (peer-reviewed)abstract
- This paper presents a novel unified analysis for the bit-error rate in the downlink of convolutionally coded and single-user detected multicarrier code-division multiple access (CDMA), multicarrier direct-sequence CDMA, time and frequency-domain spreading CDMA, and orthogonal frequency-division multiple access. Performance is analyzed under the assumption of Hadamard spreading codes, equal-gain chip combining, and a highly correlated frequency-selective Rayleigh-fading channel. Closed-form expressions are presented for the cumulative distribution function, probability distribution function, and moment-generating function for the signal-to-noise plus interference ratio after despreading. The presented results assume error-free channel estimates, a perfectly synchronized receiver, and are found to reasonably well agree with simulation results. © 2005 IEEE.
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| 787. |
- Persson, Anna
(author)
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Activation Programs, Benefit Take-Up, and Labor Market Attachment
- 2013
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Doctoral thesis (other academic/artistic)abstract
- Essay 1 (with Ulrika Vikman): Previous literature shows that activation requirements for welfare participants reduce welfare participation, but the dynamics behind these results have not been fully examined. In this paper we use a rich set of register data covering the entire working age population in a Swedish municipality to study how the introduction of mandatory activation programs aimed at unemployed welfare participants affect the probability of entering and exiting welfare. Our results indicate that the reduction in the number of welfare participants is mainly due to an increase in welfare exits. The effect is larger for unmarried individuals without children and for young individuals. Among the young we also find a reduction in welfare entries. It thus seems that individuals with fewer family responsibilities are more responsive to the reform.Essay 2: We study the impact of a set of labour market programs directed to unemployed welfare participants on criminal behaviour. To isolate the causal effect we exploit the sequential implementation of activation programs in municipalities and districts in Stockholm county. We find that criminal activity increased as a result of the programs. The size and significance levels of the estimates should be interpreted with caution, but we can conclude that the reform did at least not have a mitigating effect on crime. We find no evidence that the effect is larger for financially motivated crime.Essay 3: Given the trend towards more active policies on reducing the take-up of welfare benefits, the consequences of leaving welfare constitutes an important issue. This paper studies disposable income and poverty among welfare leavers in Sweden during 19 years (1990-2008). Using a rich set of register data we can accurately measure disposable income and labor market outcomes. We find that there are large significant differences in post welfare financial situation among those working full time and those who work only a little or not at all. Leavers neither working nor receiving benefits from social insurance are likely to be financially dependent on family members, and are more likely than others to be in poverty. We conclude that leaving welfare is not always associated with becoming financially better off, post welfare well being depend heavily on labor market outcomes.Essay 4 (with Matz Dahlberg and Linna Martén): In 1999, the Swedish government announced one of the largest reforms of the national defense in modern times, which led to closures and significant downsizing of several military bases, as well as large reductions of the workforce. Previous studies have found that workers that have been displaced from their previous employers experience significant earnings declines, even in the long run. In this paper we study the labor market effects of the involuntary job losses following the drastic changes of the Swedish security policy. Using population wide register data we estimate how labor income and unemployment benefit take-up changed among those employed at the affected military bases, relative to workers at unaffected military units. We find a decrease in labor earnings, primarily among civil servants. We find no effect on neither unemployment nor employment, indicating that the drop in earnings is likely to be driven by lower re-employment wages.
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| 788. |
- Persson, Anna, et al.
(author)
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Adopting Open Source development tools in a commercial production environment : are we locked in?
- 2005
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In: EMMSAD'05: Exploring Modeling Methods for Systems Analysis and Design. - : CEUR. ; , s. 41-52
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Conference paper (peer-reviewed)abstract
- Many companies are using model-based techniques to offer a competitive advantage in an increasingly globalised systems development industry. Central to model-based development is the concept of models as the basis from which systems are generated, tested and maintained. The availability of high-quality tools, and the ability to adopt and adapt them to the company practice, are important qualities. Model interchange between tools becomes a major issue. Without it, there is significantly reduced flexibility, and a danger of tool lock-in. We explore the use of a standardised interchange format (XMI) for increasing flexibility in a company environment. We report on a case study in which a systems development company has explored the possibility of complementingtheir current proprietary tools with open source products for supporting their model-based development activities. We found that problems still exist with interchange, and that the technology needs to mature before industrial- strength model interchange becomes a reality.
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| 789. |
- Persson, Anna, et al.
(author)
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Adopting Open Source development tools in a commercial production environment : are we locked in?
- 2006
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In: Advanced Topics in Database Research. - : IGI Global. - 9781591409359 - 1591409357 - 9781591409366 - 9781591409373 ; , s. 427-438
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Book chapter (peer-reviewed)abstract
- Many companies are using model-based techniques to offer a competitive advantage in an increasingly globalised systems development industry. Central to model-based development is the concept of models as the basis from which systems are generated, tested and maintained. The availability of high-quality tools, and the ability to adopt and adapt them to the company practice, are important qualities. Model interchange between tools becomes a major issue. Without it, there is significantly reduced flexibility, and a danger of tool lock-in. We explore the use of a standardised interchange format (XMI) for increasing flexibility in a company environment. We report on a case study in which a systems development company has explored the possibility of complementingtheir current proprietary tools with open source products for supporting their model-based development activities. We found that problems still exist with interchange, and that the technology needs to mature before industrial- strength model interchange becomes a reality.
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| 790. |
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