| 1. |
- Ahrenby, Hanna, 1978-
(författare)
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Värdegrundsarbete i bildundervisning : en studie om iscensättning av policy i grundskolans senare år
- 2021
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The overall purpose of this thesis is to describe and discuss preconditions for the enactment and the construction of fundamental values in art education in secondary school. The study is based on ethnographic methods, including classroom observations, video recordings and interviews with art teachers and pupils. Three art teachers and 36 pupils in grade eight and nine (age 14-16) have participated in the study. The schools are located in areas of different socio-economic status. Besides interviews, the empirical material consists of observation notes, video and sound recordings, documents and photographs from the observed lessons. In total, 27 lessons were observed and recorded, 20 interviews with teachers and seven interviews with pupils were conducted. The empirical material is analysed with a combination of policy enactment theory (Ball et al. 2012) and concepts form Bernstein (2000, 2003) and Bakhtin (1981, 1986).The analysis reveals that the conditions for policy enactment are created by several factors that interact. It is impossible to designate a single factor to explain why the enacted curriculum turns out the way it does. The contextual dimensions, such as material context, situated context, professional culture and external context (Ball et al. 2012), constitute a complex and unique contextual mix in every school. Together with existing subject traditions and teaching practices in art education, the unique contextual mix creates the conditions for enacting the fundamental values in art education.The art subject carries a tradition of image-making that pushes more theoretical syllabus content,such as image analysis, aside. The situated context influences the professional culture and, therefore,they function as a lens for selecting and translating the curriculum. Regardless of teachers' intentionsto enact the fundamental values in art education, the external context can create obstacles. The goal and result management of school leads to a focus on measurable subject knowledge and drive awayother curriculum parts such as the fundamental values, making it challenging to work with fundamental values in Art education.In conclusion, there are no prerequisites for realising the intentions of the fundamental values as expressed in the curriculum. Despite this, the fundamental values have a given place in Art education. Although, it is not always expressed verbally; instead, it is image-borne.
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| 2. |
- Arroyo Mühr, Laila Sara, et al.
(författare)
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Does human papillomavirus-negative condylomata exist?
- 2015
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Ingår i: Virology. - : Elsevier BV. - 1096-0341 .- 0042-6822. ; 485, s. 283-288
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Tidskriftsartikel (refereegranskat)abstract
- Condylomata acuminata is caused by human papillomavirus (HPV). PCR with consensus primers will typically detect HPV in >96% of condylomata. Metagenomic sequencing has found that some "HPV-negative" condylomata do indeed contain HPV. We wished to perform a renewed evaluation of the "HPV-negative" condylomata using deeper metagenomics sequencing. Sequencing of whole genome amplified DNA from 40 apparently "HPV-negative" condylomata detected HPV in 37/40 specimens. We found 75 different HPV types, out of which 43 represented novel putative HPV types. Three types were cloned and established as HPV types 200, 201 and 202. Molluscum contagiosum virus was detected in 24 of the 40 samples. In summary, deep sequencing enables detection of HPV in almost all condylomata. "HPV-negative" condylomata might largely be explained by clinical misdiagnosis or the presence of viral variants, distantly related HPV types and/or low viral loads.
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| 3. |
- Galanti, Maria Rosaria, et al.
(författare)
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School environment and mental health in early adolescence - a longitudinal study in Sweden (KUPOL)
- 2016
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Ingår i: BMC Psychiatry. - : Springer Science and Business Media LLC. - 1471-244X. ; 16
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Tidskriftsartikel (refereegranskat)abstract
- Background: Longitudinal studies indicate strong associations between school proficiency and indicators of mental health throughout adulthood, but the mechanisms of such associations are not fully elucidated. The Kupol study is a prospective cohort study in Sweden set up in order to: (i) describe the association of school pedagogic and social environment and its specific dimensions with the risk of mental ill-health and psychiatric disorders in adolescence; (ii) evaluate the direct effects of school pedagogic and social environment on mental health and the effects mediated by the individual's academic achievements; and (iii) assess if school pedagogic and social environment are associated with mental ill-health through epigenetic mechanisms, in particular those involving genes regulating the response to stress.Methods: The Kupol cohort at baseline consists of 3959 children attending the 7th grade of compulsory school (13-14 years old) in 8 regions of central Sweden in the school years 2013-2014 or 2014-2015. Three follow-up surveys in subsequent years are planned. Teachers' and students' perceptions of the culture, climate and ethos of their schools, and students' mental ill-health are assessed at the whole school level by annual questionnaire surveys. In order to conduct epigenetic analyses saliva specimens are collected from a nested sample of students at inception and two years later. Further, class-, family-and child-level information is collected at baseline and during each year of follow-up. Self-reported information is being complemented with register data via record-linkages to national and regional health and administrative registers.Discussion: The topic being investigated is new, and the sample constitutes the largest adolescent cohort in Sweden involved in an ad hoc study. Epigenetic analyses centered on environmental cues to stress response are a thoroughly new approach. Finally a notable feature is the multi-informant and multi-method data collection, with surveys at the school, class, family, and student level. Collaboration and data access: interested investigators should contact the coordinating centre. Additional information is available on the study's website, http://kupolstudien.se/.
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| 4. |
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| 5. |
- Hultin, Hanna, et al.
(författare)
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A generative model of a limit order book using recurrent neural networks
- 2023
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Ingår i: Quantitative finance (Print). - : Informa UK Limited. - 1469-7688 .- 1469-7696. ; 23:6, s. 931-958
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Tidskriftsartikel (refereegranskat)abstract
- In this work, a generative model based on recurrent neural networks for the complete dynamics of a limit order book is developed. The model captures the dynamics of the limit order book by decomposing the probability of each transition into a product of conditional probabilities of order type, price level, order size and time delay. Each such conditional probability is modelled by a recurrent neural network. Several evaluation metrics for generative models related to trading execution are introduced. Using these metrics, it is demonstrated that the generative model can be successfully trained to fit both synthetic and real data from the Nasdaq Stockholm exchange.
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| 6. |
- Hultin, Hanna
(författare)
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Generative models of limit order books
- 2021
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- In this thesis generative models in machine learning are developed with the overall aim to improve methods for algorithmic trading on high-frequency electronic exchanges based on limit order books. The thesis consists of two papers.In the first paper a new generative model for the dynamic evolution of a limit order book, based on recurrent neural networks, is developed. The model captures the full dynamics of the limit order book by decomposing the probability of each transition of the limit order book into a product of conditional probabilities of order type, price level, order size, and time delay. Each such conditional probability is modeled by a recurrent neural network. In addition several evaluation metrics for generative models related to order execution are introduced. The generative model is successfully trained to fit both synthetic data generated by a Markov model and real data from the Nasdaq Stockholm exchange.The second paper explores reinforcement learning methods to find optimal policies for trading execution in Markovian models. A number of different approaches are implemented and compared, including a baseline time-weighted average price (TWAP) strategy, tabular Q-learning, and deep Q-learning based on predefined features as well as with the entire limit order book as input. The results indicate that it is preferable to use deep Q-learning with the entire limit order book as input to design efficient execution policies. In order to improve the understanding of the decisions taken by the agent, the learned action-value function for the deep Q-learning with predefined features is visualized as a function of selected features.
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| 7. |
- Hultin, Hanna, et al.
(författare)
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Lack of Adjustment Latitude at Work as a Trigger of Taking Sick Leave : A Swedish Case-Crossover Study
- 2013
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Ingår i: PLOS ONE. - : Public Library of Science. - 1932-6203. ; 8:4
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Tidskriftsartikel (refereegranskat)abstract
- ObjectivesResearch has shown that individuals reporting a low level of adjustment latitude, defined as having few possibilities to temporarily adjust work demands to illness, have a higher risk of sick leave. To what extent lack of adjustment latitude influences the individual when making the decision to take sick leave is unknown. We hypothesize that ill individuals are more likely to take sick leave on days when they experience a lack of adjustment latitude at work than on days with access to adjustment latitude.MethodsA case-crossover design was applied to 546 sick-leave spells, extracted from a cohort of 1 430 employees at six Swedish workplaces, with a 3–12 month follow-up of all new sick-leave spells. Exposure to lack of adjustment latitude on the first sick-leave day was compared with exposure during several types of control periods sampled from the previous two months for the same individual.ResultsOnly 35% of the respondents reported variations in access to adjustment latitude, and 19% reported a constant lack of adjustment latitude during the two weeks prior to the sick-leave spell. Among those that did report variation, the risk of sick leave was lower on days with lack of adjustment latitude, than on days with access (Odds Ratio 0.36, 95% Confidence Interval 0.25–0.52).ConclusionsThis is the first study to show the influence of adjustment latitude on the decision to take sick leave. Among those with variations in exposure, lack of adjustment latitude was a deterrent of sick leave, which is contrary to the à priori hypothesis. These results indicate that adjustment latitude may not only capture long-lasting effects of a flexible working environment, but also temporary possibilities to adjust work to being absent. Further studies are needed to disentangle the causal mechanisms of adjustment latitude on sick-leave.
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| 8. |
- Hultin, Hanna, et al.
(författare)
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Low level of adjustment latitude : a risk factor for sickness absence
- 2010
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Ingår i: European Journal of Public Health. - : Oxford University Press (OUP). - 1101-1262 .- 1464-360X. ; 20:6, s. 682-688
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Tidskriftsartikel (refereegranskat)abstract
- Background: The prerequisite for obtaining sickness benefit is reduced work ability for medical reasons in combination with work demands which cannot be adjusted accordingly. The aim of this study was to investigate if low levels of adjustment latitude, defined as the possibility to temporarily adjust work demands in case of ill health, influence sickness absence. Methods: A prospective cohort study of 1420 employees (47% participation, aged 19-68; 56% women) was conducted at six Swedish workplaces. Exposure to two general and nine specific types of adjustment latitude was ascertained at baseline. Outcome was defined as the first new employer-reported sick-leave spell during a follow-up of 3-12 months. Hazard ratios (HR) of sick leave, with 95% confidence intervals (CI), were estimated by Cox proportional hazards regression. Results: The incidence of sickness absence was 2.85/1000 person-days. The self-reported reasons for sick leave were mainly minor complaints such as colds, influenzas and headaches. Employees lacking adjustment latitude had an adjusted HR of sickness absence of 1.51 (95% CI 1.08-2.11). Among specific adjustment latitude types, those not having the possibility to work from home generated an HR of 1.86 (95% CI 1.31-2.64). The effects of lack of adjustment latitude were similar for men and women but seemed to vary between different occupations. Conclusion: A low level of adjustment latitude at work is a risk factor for sickness absence.
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| 9. |
- Hultin, Hanna, et al.
(författare)
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Low Workload as a Trigger of Sick Leave Results From a Swedish Case-Crossover Study
- 2012
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Ingår i: Journal of Occupational and Environmental Medicine. - : Lippincott, Williams and Wilkins. - 1076-2752 .- 1536-5948. ; 54:2, s. 202-209
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Tidskriftsartikel (refereegranskat)abstract
- Objectives: To investigate if exposure to an unusually low workload when ill can trigger taking sick leave. Methods: A case-crossover design was applied to 546 sick-leave spells obtained from a cohort of 1430 employees within six Swedish workplaces. New sick-leave spells were reported from the workplaces during 3 to 12 months follow-up. Exposure was assessed in structured participant interviews at sick leave. Case and control periods from the same individual were sampled according to the matched-pair and usual-frequency approaches. Results are presented as odds ratios with surrounding 95% confidence intervals. Results: The odds ratio of sick leave on a day with an unusually low workload was 2.57 (confidence interval, 1.07-6.16). Conclusions: Becoming ill on a day with a lower workload than usual can trigger the decision to take sick leave.
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| 10. |
- Hultin, Hanna, et al.
(författare)
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Pedagogical and Social School Climate : Psychometric Evaluation and Validation of the Student Edition of PESOC
- 2019
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Ingår i: Scandinavian Journal of Educational Research. - : Routledge. - 0031-3831 .- 1470-1170. ; 63:4, s. 534-550
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Tidskriftsartikel (refereegranskat)abstract
- Previous studies indicate that school climate is important for student health and academic achievement. This study concerns the validity and reliability of the student edition a Swedish instrument for measuring pedagogical and social school climate (PESOC). Data were collected from 5,745 students at 97 Swedish secondary schools. Multilevel confirmatory factor analyses were conducted, and multilevel composite reliability estimates, as well as correlations with school-level achievement indicators, were calculated. The results supported an 8-factor structure at the student level and 1 general factor at the school level. Factor loadings and composite reliability estimates were acceptable at both levels. The school-level factor was moderately and positively correlated with school-level academic achievement. The student PESOC is a promising instrument for studying school climate.
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