| 1. |
- Hemmingsson, Morten, et al.
(författare)
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Estimation of Electro-Mechanical Mode Parameters using Frequency Measurements
- 2001
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Ingår i: Power Engineering Society Winter Meeting, 2001. IEEE. - 0780366727 ; 3
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Konferensbidrag (refereegranskat)abstract
- Oscillation frequency and damping of electro-mechanical modes in a power system have traditionally been determined from events caused by large disturbances such as line switchings or generator tripping. Recent papers have shown the possibility to extract this information during normal operation from measurements of power through, or angle difference across, a transmission line. In this paper these methods are applied to frequency measurements from a 230 V wall-outlet. If accurate frequency and phase estimates can be obtained, this can be used for load control to damp electro-mechanical oscillations. Doing this in the distribution system is easier than in the transmission system. Using frequency for this has the advantage that this signal is available everywhere. It would thus be convenient if the estimation of modes and damping could be done in the distribution system. The results show that it is much harder to detect electro-mechanical mode information from frequency than from angle difference or power. However, it is possible to find the frequency of two electromechanical modes whereas the damping has too large an uncertainty. Fundamental problems when using frequency for mode estimation are further discussed
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| 2. |
- Samuelsson, Olof, et al.
(författare)
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Load Modulation for Damping of Electro-Mechanical Oscillations
- 2001
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Ingår i: [Host publication title missing]. - 0780366727
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Konferensbidrag (refereegranskat)abstract
- Today it is feasible for utilities to control selected customer loads in a nondisturbing fashion. This is comparable to load shedding, but has a wider area of application. This paper focuses on direct load control or modulation for power system damping and is based on a field test of on-off control and modal analysis of differential-algebraic equation models of three test systems. Real power load controlled by bus frequency is found to be robust to changes in network topology. It is shown that on-off modulation is more effective than sinusoidal modulation for damping of large oscillations, but not for small oscillations. It proves difficult to give a general measure of the required amount of controlled load, since modulation of real power loads has an additive rather than multiplicative effect on power flows. Different structures of load control systems are listed. If the system is centralized, it is suggested that the distribution company owns and operates the system and that damping is sold as ancillary service
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| 3. |
- Bylund, Bengt, et al.
(författare)
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Very low birth weight children at 9 years : School performance and behaviour in relation to risk factors
- 2000
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Ingår i: Prenatal and Neonatal Medicine. - 1359-8635 .- 1473-0774. ; 5:2, s. 124-133
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Tidskriftsartikel (refereegranskat)abstract
- Objectives To investigate the school performance and behavior of very low-birth-weight children in comparison with controls, and relate the findings to risk factors. Methods All children with birth weight below 1501 g (VLBW) and normal birth weight (NBW) controls, born in the south-east region of Sweden during a 15-month period in 1987-88, were enrolled in a prospective follow-up study; 81 % (n = 70) and 82% (n = 72), respectively, were re-examined at the age of 9 years regarding growth, neurological status, neurofunctional classification and academic achievement tests (Raven's matrices, mathematics, vocabulary, reading ability). The need for special education at school was assessed and four behavioral problem scores were also assessed (hyperactivity, fine motor skills, gross motor skills, social skills). Children with known handicaps were not re-examined. Results VLBW children were shorter and lighter than controls, and differed from them with regard to neurological functional classification. As a group, they produced poorer results in all academic achievement tests except vocabulary, and also in two out of four behavioral subscales (hyperactivity and fine motor skills). When the comparison was restricted to children with normal Raven scores, almost all the differences disappeared. VLBW children had more reading difficulties but were less often than expected defined as dyslexic compared to NEW children.
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| 4. |
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| 5. |
- Krupic, Ferid, et al.
(författare)
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The Influence of Age, Gender and Religion on Willingness to be an Organ Donor: Experience of Religious Muslims Living in Sweden.
- 2019
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Ingår i: Journal of religion and health. - : Springer Science and Business Media LLC. - 1573-6571 .- 0022-4197. ; 58, s. 847-859
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Tidskriftsartikel (refereegranskat)abstract
- The transplantation of organs is one of the most successful medical advances in recent decades, and transplantation is the treatment of choice for severe organ failure worldwide. Despite this situation and the general acknowledgment of organ donation (OD) as a global priority, the demand for organs outstrips the supply in virtually every country in the world. The study aims to elucidate whether age, gender and religion influence decision-making about organ donation in religious Muslims living in Sweden Data were collected through three group interviews using open-ended questions and qualitative content analysis. Twenty-seven participants, 15 males and 12 females from four countries, participated in the focus group interviews. The analysis of the collected data resulted in three main categories: "Information and knowledge about organ donation," "The priorities when deciding about organ donation" and "The religious aspects of organ donation," including a number of subcategories. Good information about and knowledge of OD, priorities in OD, importance of the fact that religion must be studied and taught daily and religious education were only a few of the factors informants emphasized as predictors of the total and successful donation of organs. Age, gender or religion did not have an impact on organ donation. High levels of education through religious education and good information via various media, as well as a good knowledge of the Swedish language, are predictors of improved OD. In order to overcome religious ideology as a source of misinformation relating to OD and to promote increased OD in the future, specific intervention studies and the improved involvement of religious communities and education in schools and the healthcare system are vital and must be a starting point for improved OD.
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| 6. |
- Samuelsson, Stefan, 1964-, et al.
(författare)
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A longitudinal study of reading skills among very-low-birthweight children : Is there a catch-up?
- 2006
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Ingår i: Journal of Pediatric Psychology. - : Oxford University Press (OUP). - 0146-8693 .- 1465-735X. ; 31:9, s. 967-977
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Tidskriftsartikel (refereegranskat)abstract
- Objective: To examine the development of reading skills among very-low-birthweight (VLBW) children and to what extent reading difficulties at 9 years of age persist unchanged, are attenuated, or are enhanced at 15 years of age. Methods: Fifty-six VLBW and 52 normal birthweight (NBW) children were assessed on word decoding, word recognition, and reading comprehension at 9 and 15 years of age. Results: VLBW children showed deficits in reading skill at 9 years of age, while most differences obtained at 15 years of age did not reach significance. VLBW children improved their reading comprehension between 9 and 15 years of age more than NBW children, and when controlling for individual differences in IQ, VLBW children improved both their reading comprehension and word-recognition skill. Conclusion: The results suggest that VLBW children display positive changes over time in reading skills. © The Author 2006. Published by Oxford University Press on behalf of the Society of Pediatric Psychology. All rights reserved.
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| 7. |
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| 8. |
- Akke, Magnus, et al.
(författare)
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An object-oriented transformer model in OMOLA
- 1997
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Ingår i: Proceedings of the world congress - International federation of Automatic Control. - 0080429262 ; , s. 259-264
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Konferensbidrag (refereegranskat)
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| 9. |
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| 10. |
- Alterman, Mathias, et al.
(författare)
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P1/P1' modified HIV protease inhibitors as tools in two new sensitive surface plasmon resonance biosensor screening assays
- 2001
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Ingår i: European Journal of Pharmaceutical Sciences. - : Elsevier. - 0928-0987 .- 1879-0720. ; 13:2, s. 203-212
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Tidskriftsartikel (refereegranskat)abstract
- The commonly used HIV-1 protease assays rely on measurements of the effect of inhibitions on the hydrolysis rate of synthetic peptides. Recently an assay based on surface plasmon resonance (SPR) was introduced. We have taken advantage of the fact that the SPR signal is proportional to the mass of the analyte interacting with the immobilised molecule and developed two new improved efficient competition assay methods. Thus, high molecular weight binders were used as amplifiers of the surface plasmon resonance signal. Linkers were attached by a Heck reaction to the para-positions of the P1/P1′ benzyloxy groups of a linear C2-symmetric C-terminal duplicated inhibitor to enable (a) biotin labelling or (b) direct immobilisation of the inhibitor to the biosensor surface matrix. The interaction properties of a series of 17 structurally diverse inhibitors was assessed and compared to previously reported data. The most sensitive assay was obtained by immobilising the enzyme and amplifying the signal with an antibody, giving a detection range between 0.1 nM and 10 μM. Immobilisation of the inhibitor resulted in a stable and durable surface but a narrower detection range (1–100 nM). The two competition assays are anticipated to be very suitable for fast screening of potential HIV inhibitors.
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| 11. |
- Andernord, Daniel, et al.
(författare)
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Anterior cruciate ligament graft selection and fixation
- 2015
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Ingår i: Sports Injuries: Prevention, Diagnosis, Treatment and Rehabilitation, Second Edition. - Berlin : Springer. - 9783642365690 ; , s. 817-822
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- This chapter presents a nonanatomical double-bundle ACL reconstruction technique. The reconstruction is performed using hamstring tendons that are harvested, maintaining intact the tibial insertion. The anteromedial bundle is restored placing the graft in the “over-the-top position, while the posterolateral bundle is replaced retrieving the graft from a femoral tunnel. Graft fixation is obtained using metal staples. Hundreds of patients have been treated with this technique during the last 10 years, including athletes with high functional requests. Furthermore, in vivo analysis of knee kinematic confirmed the effectiveness of the technique. © Springer-Verlag Berlin Heidelberg 2012, 2015, All Rights Reserved.
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| 12. |
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| 13. |
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| 14. |
- Björnstedt, Johan, et al.
(författare)
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Experimental investigation on steady-state and transient performance of a self-excited induction generator
- 2011
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Ingår i: IET Generation, Transmission & Distribution. - : Institution of Engineering and Technology (IET). - 1751-8687. ; 5:12, s. 1233-1239
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Tidskriftsartikel (refereegranskat)abstract
- This study presents a novel approach to determine the steady-state performance of a self-excited induction generator (SEIG). The method gives an intuitive understanding of the effects of loading on the steady-state performance of the SEIG, without requiring any major mathematical effort. The steady-state no-load voltage of the SEIG is determined as the intersection between the generator no-load curve and the capacitor characteristics. The proposed method extends this approach to a loaded generator by replacing the no-load characteristic by a new generator-load curve. The method is initially applied in a lab environment, but a suitable algorithm to be used instead is also introduced. The algorithm has been validated through laboratory measurement showing an excellent agreement between theoretical and experimental results. Furthermore, an experimental investigation of the demagnetisation process of the SEIG is performed, showing how remanent flux depends on applied fault or load resistance. This analysis reveals some issues not previously reported in the literature. The relationship between remanent flux and speed at which self-excitation occurs is shown to contain a discontinuity, above which a fixed minimum speed is required for re-excitation given a certain capacitance. Below the discontinuity the minimum re-excitation speed is dependent on how the generator was demagnetised.
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| 15. |
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| 16. |
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| 17. |
- Blomgren, Emma M.V., et al.
(författare)
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Intensive Data-Driven Model for Real-Time Observability in Low-Voltage Radial DSO Grids
- 2023
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Ingår i: Energies. - 1996-1073. ; 16:11
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Tidskriftsartikel (refereegranskat)abstract
- Increasing levels of distributed generation (DG), as well as changes in electricity consumption behavior, are reshaping power distribution systems. These changes might place particular stress on the secondary low-voltage (LV) distribution systems not originally designed for bi-directional power flows. Voltage violations, reverse power flow, and congestion are the main arising concerns for distribution system operators (DSOs), while observability in these grids is typically nonexistent or very low. The present paper addresses this issue by developing a method for nodal voltage estimation in unbalanced radial LV grids (at 0.4 kV). The workflow of the proposed method combines a data-driven grey-box modeling approach with generalized additive models (GAMs). Furthermore, the proposed method relies on experimental data from a real-world LV grid in Denmark and uses data input from only one measuring device per feeder. Predictions are evaluated by using a test data set of 31 days, which is more than twice the size of the training data set of 13 days. The prediction results show high accuracy at root mean squared errors (RMSEs) of 0.002–0.0004 p.u. The method also requires a short computation time (14 s for the first stage and 2 s for the second stage) that meets requirements for the practical, real-time monitoring of DSO grids.
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| 18. |
- Bollen, Math, et al.
(författare)
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Controlled island operation of part of the 50-kV grid in Southern Sweden
- 2009
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Ingår i: 2009 IEEE Bucharest PowerTech Proceedings. - Piscataway, NJ : : IEEE Communications Society. - 9781424422357 ; , s. 1-6
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Konferensbidrag (refereegranskat)abstract
- This paper is based on measurements obtained during a test of controlled islanding of part of the 50-kV grid in Southern Sweden. The purpose of the test was to verify operation of generator controls during islanding. The variations in voltage magnitude and frequency are shown as well as flicker severity and very-short variations. A number of performance indices have been calculated and compared with limits. Voltage magnitude and frequency have been studied in some detail around the disconnection and reconnection instants. The frequency varies much more during the island operation than during grid-connected operation. Voltage magnitude variations and flicker remain within their normal range. However the variations in the time range between 3 seconds and 10 minute appear to be higher than normal.
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| 19. |
- Bollen, Math, et al.
(författare)
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Performance indicators for microgrids during grid-connected and island operation
- 2009
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Ingår i: 2009 IEEE Bucharest PowerTech Proceedings. - Piscataway, NJ : IEEE Communications Society. - 9781424422357
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Konferensbidrag (refereegranskat)abstract
- This paper discusses methods for quantifying the performance of microgrids during island operation. Such methods are essential for comparing different designs and different control algorithms. Performance indicators and objectives are proposed for voltage-quality variations, for individual dips and interruptions, and for the reliability during island operation.
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| 20. |
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| 21. |
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| 22. |
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| 23. |
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| 24. |
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| 25. |
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| 26. |
- Ekström, Anna, 1979-, et al.
(författare)
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It depends on who Im with: How young people with developmental language disorder describe their experiences of language and communication in school
- 2023
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Ingår i: International journal of language and communication disorders. - : WILEY. - 1368-2822 .- 1460-6984. ; 58:4, s. 1168-1181
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Tidskriftsartikel (refereegranskat)abstract
- BackgroundThe risks of developmental language disorder (DLD) for both educational progress and socio-emotional development are well documented, but little is known about how children and young people with DLD experience and describe their language and communication. The need to complement experimental and quantitative studies with qualitative perspectives of the lived experience of individuals with DLD for speech and language therapists (SLT) practice has recently been foregrounded. AimsTo understand further the experiences of young people with DLD focusing on language and communication in a school context, and thereby contribute to the improvement of the communicative situation in school for this group. The study is guided by the following research question: How do young people diagnosed with DLD describe their experiences of language and communication in school? Methods & ProceduresThe study is based on data generated from qualitative semi-structured interviews with 23 participants diagnosed with DLD (age 13-19 years old) living in Sweden. All participants attended mainstream schools. To enable data to be collected during COVID-19 restrictions, all interviews were conducted using Zoom. Reflexive thematic analysis was used to analyse the data. Outcomes & ResultsFour main themes related to experiences of language and communication in school were constructed from the interviews: (1) feelings of inadequacy and comparisons with others; (2) feelings of being misjudged and misunderstood; (3) the importance of feeling safe and comfortable; and (4) the significance of the social and communicative context. The results bear witness of difficult and challenging aspects related to language and communication in school, including educational, social and emotional dimensions. An important outcome of this study is how young people diagnosed with DLD describe their language and communication functioning to be dependent on both individual characteristics and abilities, as well as situational, contextual and social factors. Conclusions & ImplicationsThe results from this study show that young people with DLD can have persisting problems related to language and communication in school, including educational, social and emotional dimensions. SLT services may therefore be needed throughout the school years to ensure that students with DLD receive adequate support. In addition, support that goes beyond language abilities and targets social, contextual and emotional aspects should be considered. WHAT THIS PAPER ADDSWhat is already known on this subjectChildren and young people have unique knowledge about their language and communication which is instrumental for designing interventions and support strategies. Qualitative analyses of interview data have been able to identify both risk factors and protective strategies in relation to the well-being of individuals with DLD. Despite this, children and young people with DLD are rarely heard in research or clinical discussions. What this paper adds to existing knowledgeIn this study we listen to the voices of young people with DLD as they describe their experiences of language and communication in school. The participants describe a condition that makes them struggle to keep up with peers and puts them at risk of being misjudged by teachers, but also give examples of situations where negative consequences are hardly felt. What are the potential or actual clinical implications of this work?DLD is a complex and dynamic disorder where contextual and social factors interact with individual abilities in creating the end result. The results of the study indicate that DLD can cause persisting problems related to language and communication in school, with impact on educational, social and emotional dimensions. To counteract these effects, SLT services may be needed throughout the school years, and support that goes beyond language abilities must be considered.
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| 27. |
- Ekström, Anna, 1979-, et al.
(författare)
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Likvärdig utbildning för barn med språkstörning : en studie av måluppfyllelse, erfarenheter och deltagande
- 2023
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Ingår i: Resultatdialog 2023. - Stockholm : Vetenskapsrådet. ; , s. 32-37
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Språkstörning är en funktionsnedsättning som förekommer hos cirka sju procent av alla barn. Eftersom skolans undervisning förutsätter en god språklig förmåga, är risken stor att dessa elever inte når skolans mål. I detta pågående projekt undersöks situationen för elever med språkstörning i den svenska skolan med både kvantitativa och kvalitativa undersökningar.
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| 28. |
- Ellman Kareld, Louise, et al.
(författare)
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Länsprogram Kronobergs län : Regional miljöövervakning 2015-2020
- 2014
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- SammanfattningLänsprogrammet för Regional miljöövervakning, 2015-2020 för Kronobergs län, omfattar åtta programområden: Luft, Skog, Jordbruk, Våtmarker, Landskap, Sötvatten, Miljögiftssamordning och Hälsorelaterad miljöövervakning. Övervakning planeras inom 24 delprogram, fördelade på åtta programområden. Inom två delprogram sker övervakning först nästa programperiod.Fem ingående delprogram är nationella, de genomförs över hela landet. I länet har övervakning genom Gemensamma delprogram prioriterats.19 delprogram är sådana och genomförs i samarbete med andra län. De är markerade med en asterisk (*) i anslutning till rubriken. Inga gemensamma delprogram leds dock från länet under den kommande programperioden. De gemensamma delprogrammen möjliggörs övervakning inom samtliga åtta programområden.I länsprogrammet redovisas, oberoende av finansiär, den övervakning i Kronobergs län som ska bedrivas kontinuerligt under programperioden. Den totala kostnaden för hela programmet är svår att beräkna. Naturvårdsverket lämnar bidrag med 852 000 kronor årligen, men det finns även andra medel till andra särskilt riktade medel för exempelvis kalkeffektuppföljningen inom programområde Sötvatten som Hav- och vattenmyndigheten fördelar. Inom programområde Sötvatten finansieras recipientkontrollen helt av Vattenvårdsförbunden m.fl., och råvattenkontrollen delvis av länets kommuner. Övervakning inom programområde Luft sker genom Kronobergs läns luftvårdsförbund. Övervakningen av luftföroreningar i tätorter finansieras till största delen av kommunerna inom ett så kallat samverkansområde för kontroll av luftkvalitet. Inom programområde Hälsa och miljögifter finns en god samverkan med Landstinget Kronoberg och länets kommuner.Länsprogrammet innebär att data samlas in för att ge underlag för uppföljning av preciseringar och regionala miljömål till Miljökvalitetsmålen Frisk luft, Bara naturlig försurning, Giftfri miljö, Ingen övergödning, Levande sjöar och vattendrag, Grundvatten av god kvalitet, Levande skogar, Ett rikt odlingslandskap, God bebyggd miljö och Ett rikt växt- och djurliv.
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| 29. |
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| 30. |
- Finnström, Orvar, 1938-, et al.
(författare)
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Very-low-birth-weight children at school age : Academic achievement, behavior and self-esteem and relation to risk factors
- 2003
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Ingår i: The Journal of Maternal-Fetal & Neonatal Medicine. - 1476-7058 .- 1476-4954. ; 14:2, s. 75-84
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Tidskriftsartikel (refereegranskat)abstract
- Objective: To investigate school performance, behavior and self-esteem of children with very low birth weight (VLBW). Methods: All children with birth weight below 1501 g (VLBW) and normal birth weight controls, born in the south-east region of Sweden during a 15-month period in 1987-88, were enrolled in a prospective follow-up study. At the age of 9 years, 81% and 82%, respectively, were re-examined regarding growth, neurofunctional classification, academic achievement tests, need for special education and behavioral problems. At 12 years, 89% and 76%, respectively, were re-examined regarding growth, neurofunctional classification, visual acuity and self-esteem. Results: VLBW children were shorter and lighter, and differed from the controls with regard to neurological functional classification. They produced poorer results in most academic achievement tests. When the comparison was restricted to children with normal intelligence, almost all the differences in other academic achievements disappeared. VLBW children had more reading difficulties but were less often than expected defined as dyslexics compared to control children. We did not find any major disparity in visual acuity and self-esteem between the groups. Low Apgar scores, intracranial hemorrhage and the need for mechanical ventilation neonatally were associated with poorer results in most outcome measures. Neurofunctional assessments in early childhood were associated with most outcome measures. The mother's education was related to delayed reading skills and need for special education. Conclusions: Although VLBW children performed less well in most academic achievement tests and on some behavioral subscales, those who had a normal intellectual capacity did not differ in any important aspects from the controls.
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| 31. |
- Gertmar, Lars, et al.
(författare)
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On DC injection to AC grids from distributed generation
- 2005
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Ingår i: 2005 IEEE 11th European Conference on Power Electronics and Applications. - 9075815093
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Konferensbidrag (refereegranskat)abstract
- Distributed generation, DG, introduces multi-generator grids and new modes of operation. DG will likely introduce power electronic, PE, converters on a large scale at the low- and medium-voltage levels. DC injection into the AC grid is a threat from grid-connected PE converters that are badly structured. Low DC currents in AC current are difficult to measure at those low levels decided in IEEE™ 1547 and discussed in other international working groups. Transformers and PE can be co-designed to eliminate DC injection. Modern adjustable-speed drives, ASDs, especially, those with active rectifiers, form a basis to discuss and solve issues of DC injection to AC grids from DG also named distributed energy resources, DER or even DR. DC components from power electronics, embedded in solar power, wind power, energy storage, smart houses, smart-office buildings, own generators, etc. give rise to grid-aspects like AC components give frequencies around the fundamental one. FMEA, failure mode and effects analysis, is judged to be a tool for further synthesis
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| 32. |
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| 33. |
- Guldbrand, Anna, et al.
(författare)
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Central or Local Compensation of Earth-Fault Currents in Non-Effectively Earthed Distribution Systems
- 2007
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Ingår i: 2007 IEEE LAUSANNE POWERTECH, VOLS 1-5. - 9781424421893 ; , s. 1129-1134
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Konferensbidrag (refereegranskat)abstract
- Centralized Petersen coil earthing in networks with extensive use of underground cable involves flow of large quantities of reactive earth fault current. In networks with long radial cable feeders this creates problems involving active losses and active and reactive earth fault current. One possible solution to the problem is the use of local compensation. This paper aims at understanding the limitations of traditionally compensated networks and compares these to networks that are locally compensated. This is done through analytical calculations and PSCAD simulations that are combined with results from a project studying cables in Swedish distribution networks. In addition, basic PSCAD simulations are used to clarify how the rating and placing of the distributed compensation units affects active earth fault current and investment costs
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| 34. |
- Guldbrand, Anna, et al.
(författare)
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Influence of distributed compensation on earth fault protection in cable distribution systems
- 2008
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Ingår i: Developments in Power System Protection, 2008. DPSP 2008. IET 9th International Conference on. - 9780863419027 ; , s. 615-620
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Konferensbidrag (refereegranskat)abstract
- The growing use of underground cables in distribution systems increases the capacitive coupling of the network to earth and as a consequence the capacitive earth fault current. In rural systems consisting of long cable feeders the extensive reactive current transportation gives rise to resistive losses that influence the earth fault protection. Simulations carried out in this work suggest the resistive losses disable sensitive earth fault protection in centrally compensated resonant earthed neutral systems unless unconventional low earth fault protection thresholds are applied. The introduction of distributed compensation will decrease the reactive current transportation and associated resistive losses. Distributed compensation will enable the use of sensitive earth fault protection using conventional protection thresholds.
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| 35. |
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| 36. |
- Gäddlin, Per-Olof, 1946-, et al.
(författare)
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Academic achievement, behavioural outcomes and MRI findings at 15 years of age in very low birthweight children
- 2008
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Ingår i: Acta Paediatrica. - : Wiley. - 0803-5253 .- 1651-2227. ; 97:10, s. 1426-1432
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Tidskriftsartikel (refereegranskat)abstract
- Aim: To assess cognitive, academic, and behavioural functions in 15-year-old very low birthweight (VLBW) children and relate results to gender, neonatal risk factors, growth, and Magnetic Resonance Imaging (MRI) findings. Methods: 61/86 VLBW children and 57/86 term controls born in the south-east region of Sweden were assessed regarding cognition (WISC III), school outcome, behaviour, and growth. VLBW children were examined using cerebral MRI. Results: VLBW children performed significantly lower than their term controls on WISC III and 49% had IQ lower than 85. Ten VLBW children with IQ <70 had not been clinically identified earlier and a majority of these children attended mainstream school. VLBW girls had significantly lower total problems scores. Using MRI, white matter damage (WMD) was detected in 16 (27%) children. VLBW boys with WMD had significantly lower IQ than those without. Small occipito-frontal circumference correlated with low IQ. Mechanical ventilation and intraventricular haemorrhage (IVH) showed significant correlations with lower IQ and reading skills. Conclusion: VLBW children achieved poorer results compared with their controls in cognitive tests. Mechanical ventilation and IVH were related to poorer academic outcome. Many of the children with low IQ had not been identified earlier. Therefore, we recommend that VLBW children undergo an IQ test before beginning school in order to receive adequate support.
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| 37. |
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| 38. |
- Hamrin Senorski, Eric, 1989, et al.
(författare)
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Increased odds of patient-reported success at 2years after anterior cruciate ligament reconstruction in patients without cartilage lesions: a cohort study from the Swedish National Knee Ligament Register.
- 2018
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Ingår i: Knee surgery, sports traumatology, arthroscopy. - : Springer Science and Business Media LLC. - 1433-7347 .- 0942-2056. ; 26:4, s. 1086-1095
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Tidskriftsartikel (refereegranskat)abstract
- To investigate whether the surgical technique of single-bundle anterior cruciate ligament (ACL) reconstruction, the visualization of anatomic surgical factors and the presence or absence of concomitant injuries at primary ACL reconstruction are able to predict patient-reported success and failure. The hypothesis of this study was that anatomic single-bundle surgical procedures would be predictive of patient-reported success.This cohort study was based on data from the Swedish National Knee Ligament Register during the period of 1 January 2005 through 31 December 2014. Patients who underwent primary single-bundle ACL reconstruction with hamstring tendons were included. Details on surgical technique were collected using an online questionnaire comprising essential anatomic anterior cruciate ligament reconstruction scoring checklist items, defined as the utilization of accessory medial portal drilling, anatomic tunnel placement, the visualization of insertion sites and pertinent landmarks. A univariate logistic regression model adjusted for age and gender was used to determine predictors of patient-reported success and failure, i.e. 20th and 80th percentile, respectively, in the Knee injury and Osteoarthritis Outcome Score (KOOS), 2years after ACL reconstruction.In the 6889 included patients, the surgical technique used for single-bundle ACL reconstruction did not predict the predefined patient-reported success or patient-reported failure in the KOOS4. Patient-reported success was predicted by the absence of concomitant injury to the meniscus (OR=0.81 [95% CI, 0.72-0.92], p=0.001) and articular cartilage (OR=0.70 [95% CI, 0.61-0.81], p<0.001). Patient-reported failure was predicted by the presence of a concomitant injury to the articular cartilage (OR=1.27 [95% CI, 1.11-1.44], p<0.001).Surgical techniques used in primary single-bundle ACL reconstruction did not predict the KOOS 2years after the reconstruction. However, the absence of concomitant injuries at index surgery predicted patient-reported success in the KOOS. The results provide further evidence that concomitant injuries at ACL reconstruction affect subjective knee function and a detailed knowledge of the treatment of these concomitant injuries is needed.Retrospective cohort study, Level III.
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| 39. |
- Hamrin Senorski, Eric, 1989, et al.
(författare)
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Ten-Year Risk Factors for Inferior Knee Injury and Osteoarthritis Outcome Score After Anterior Cruciate Ligament Reconstruction A Study of 874 Patients From the Swedish National Knee Ligament Register
- 2018
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Ingår i: American Journal of Sports Medicine. - : SAGE Publications. - 0363-5465 .- 1552-3365. ; 46:12, s. 2851-2858
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Tidskriftsartikel (refereegranskat)abstract
- Background: Factors relating to the patient and anterior cruciate ligament (ACL) reconstruction may help to identify prognostic factors of long-term outcome after reconstruction. Purpose: To determine 10-year risk factors for inferior knee function after ACL reconstruction. Methods: Prospectively collected data from the Swedish National Knee Ligament Register were extracted for patients who underwent ACL reconstruction between January 2005 and December 2006. Patients who had no data at the 10-year follow-up for the Knee injury and Osteoarthritis Outcome Score (KOOS) were excluded. Multivariable proportional odds regression modeling was used to assess 10-year patient- and surgery-related risk factors across all the KOOS subscales and the KOOS4 (mean score of 4 subscales: pain, knee-related symptoms, function in sport and recreation, and knee-related quality of life). Results: A total of 874 (41%) patients were included (male, 51.5%; median age at the time of ACL reconstruction, 27.5 years [range, 11.2-61.5 years]). An increase in the severity of concomitant articular cartilage injuries resulted in a reduced KOOS on 4 subscales (odds ratio, 0.64-0.80; P < .05). A higher preoperative KOOS pain score increased the odds of a higher score on the pain, symptoms, and sport subscales and the KOOS4. In addition, a higher preoperative body mass index was a significant risk factor for lower scores on 3 KOOS subscales and the KOOS4. No patient- or surgery-related predictor was significant across all KOOS subscales. Conclusion: This 10-year risk factor analysis identified several factors that can affect long-term knee function after ACL reconstruction. Most risk factors were related to preoperative patient-reported outcome and potentially modifiable. On the other hand, most of the surgery-related risk factors were nonmodifiable. Nevertheless, this information may be helpful to physicians and physical therapists counseling patients on their expectations of outcome after ACL reconstruction.
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| 40. |
- Hansson, Per-Olof, et al.
(författare)
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Teaching Avatars on Controversial Issues: Lessons Learned
- 2023
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Ingår i: IAFOR Journal of Education. - 2187-0594. ; 11:2, s. 61-78
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Tidskriftsartikel (refereegranskat)abstract
- This paper describes and evaluates student teachers’ virtual simulation training on teaching a controversial issue. In the fourth year of their program to become social science teachers at lower and upper secondary schools, 43 student teachers in Sweden conducted simulation teaching on conspiracy theories as an example of a controversial issue. Conspiracy theories appeal to young people and they often encounter these theories online, but they can be met with increased knowledge about how conspiracy theories work, and how they can be identified and countered. Thus, students at primary and secondary school need to develop their critical source skills. The Swedish Schools Inspectorate (2022) found that these issues were not properly taught because they were not connected to schools’ values-based work or to the development of students’ democratic competence. To analyze the simulation teaching, data was collected through observations, video-recorded simulation teaching, interviews with student teachers, and reflective documents. The results show that simulation teaching offers student teachers the opportunity to integrate content knowledge, pedagogical content knowledge, and subject knowledge, by being trained to become flexible and responsive to avatars’ individual differences as well as their different attitudes and understanding of the subject.
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| 41. |
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| 42. |
- Hillberg, Emil, et al.
(författare)
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Active Network Management for All : ANM4L a collaborative research project
- 2020
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Developments of the power system are driven by the need to decrease the environmental footprint, to meet international climate goals, pushing for fossil‐free energy system. The transition towards clean energy will require power systems to adapt on a global scale with significant investments needed in fossil‐free electricity generation and transport. Renewable Energy Sources (RES) play an increasingly important role in the power system and may become the dominant sources of electricity. Significant RES are integrated in distribution grids globally, resulting in an increased need for distribution grids to perform new and complex tasks necessary for continued grid stability. The rapidity of small‐scale investments calls for agile, alternative grid development solutions. This agility is furthermore necessary to meet challenges arising from demand scenarios encompassing intermittent renewables along with electrification of transport and heat sectors. New technologies and markets are emerging to provide flexibility in consumption, generation, and power transfer capacity. Active Network Management (ANM) solutions provides alternative methods for planning and operation of the power system, through monitoring and control of multiple grid assets. This paper presents an overview of the ongoing project ANM4L, where a toolbox will be developed to support operation and planning of distribution grids.The project ANM4L (Active network management for all - anm4l.eu), will develop and demonstrate innovative ANM solutions for increasing integration of distributed generation in electricity distribution systems. ANM solutions will consider management of active and reactive power to avoid overload situations and maintain voltage limits. The goal is to decrease the need of curtailment of renewable energy, theoretically enabling further integration of distributed generation potentially even above the current design limitations of the electricity network. Core research and development activities of the ANM4L project include development of: ANM methods for local energy systems. Economic considerations to provide decision support. A toolbox to support the planning and operation. The toolbox, methods and business models for ANM will be demonstrated in real life distribution grids in both Sweden and Hungary. Furthermore, the project will consider the replicability and scalability necessary for these ANM solutions to be applied across the EU.
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