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- Moberg, Christina, et al.
(författare)
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De unga gör helt rätt när de stämmer staten
- 2022
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Ingår i: Aftonbladet. - 1103-9000.
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Tidskriftsartikel (populärvet., debatt m.m.)abstract
- 1 620 forskare och lärare i forskarvärlden: Vi ställer oss bakom Auroras klimatkrav
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| 3. |
- Nordbeck, Patric C, et al.
(författare)
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DFA as a window into postural dynamics supporting task performance : Does choice of step size matter?
- 2023
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Ingår i: Frontiers in Network Physiology. - 2674-0109. ; 3
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Tidskriftsartikel (refereegranskat)abstract
- Introduction: Detrended Fluctuation Analysis (DFA) has been used to investigate self-similarity in center of pressure (CoP) time series. For fractional gaussian noise (fGn) signals, the analysis returns a scaling exponent, DFA-α, whose value characterizes the temporal correlations as persistent, random, or anti- persistent. In the study of postural control, DFA has revealed two time scaling regions, one at the short-term and one at the long-term scaling regions in the diffusion plots, suggesting different types of postural dynamics. Much attention has been given to the selection of minimum and maximum scales, but the choice of spacing (step size) between the window sizes at which the fluctuation function is evaluated may also affect the estimates of scaling exponents. The aim of this study is twofold. First, to determine whether DFA can reveal postural adjustments supporting performance of an upper limb task under variable demands. Second, to compare evenly-spaced DFA with two different step sizes, 0.5 and 1.0 in log2 units, applied to CoP time series. Methods: We analyzed time series of anterior-posterior (AP) and medial-lateral (ML) CoP displacement from healthy participants performing a sequential upper limb task under variable demand. Results: DFA diffusion plots revealed two scaling regions in the AP and ML CoP time series. The short-term scaling region generally showed hyper-diffusive dynamics and long-term scaling revealed mildly persistent dynamics in the ML direction and random-like dynamics in the AP direction. There was a systematic tendency for higher estimates of DFA-α and lower estimates for crossover points for the 0.5-unit step size vs. 1.0-unit size. Discussion: Results provide evidence that DFA-αcaptures task-related differences between postural adjustments in the AP and ML directions. Results also showed that DFA-αestimates and crossover points are sensitive to step size. A step size of 0.5 led to less variable DFA-α for the long-term scaling region, higher estimation for the short-term scaling region, lower estimate for crossover points, and revealed anomalous estimates at the very short range that had implications for choice of minimum window size. We, therefore, recommend the use of 0.5 step size in evenly spaced DFAs for CoP time series similar to ours.
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| 5. |
- Svensson-Hoglund, Sahra, et al.
(författare)
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The Role of Repair as a Resource for Resilience : Case Studies on the Effects of Repair Outcomes of Essential Products
- 2023
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Ingår i: Proceedings of the 5th PLATE Conference. - 9789526413679 ; , s. 1051-1057
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Konferensbidrag (refereegranskat)abstract
- In both the US and EU, policymakers and government agencies are acknowledging theimportance of having access to repair options, particularly for vulnerable product users who depend on their products. As such, repair can play an important role as a resource for resilience, but research is missing. We propose that repair can act as a resource for resilience. A comprehensive, structured way to understand this role of repair is needed to: (1) show how repair is a social interest and thereby increase public willingness to overcome current barriers to repair, and; (2) ensure that current policy efforts to increase access to repair succeed at strengthening the resilience of product users. To test this framing, we use four case studies on the breakdown of essential products; laptops in schools, tractors at farms; cell phones in refugee camps, and ventilators at hospitals. Our findings indicate that the conditions under which repair can function as a resource for resilience can be regarded as a span: on one end repair is crucial for continued functioning, due to the lack of other options in the pre-breakage context; on the other end, repair constitutes, compared to other available options, the most beneficial strategy for restoring functionality. Further, the effectiveness of repair as a resource for resilience is determined by the conditions of repair as high vs. low friction. Moreover, we find that while repair constitutes, in itself, a resource for resilience, it also has the potential to act as a gateway to other resources for resilience, such as financial and social. Implications for policy and future research are briefly discussed.
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