| 11. |
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| 12. |
- Kjus, SH, et al.
(författare)
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Statistics of the lower hybrid wave cavities detected by the FREJA satellite
- 1998
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Ingår i: JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS. - : AMER GEOPHYSICAL UNION. ; 103:A11, s. 26633-26647
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Localized electrostatic wave packets in the frequency region of lower hybrid waves have been detected by the instruments on the FREJA satellite and also earlier by instrumented rocket payloads. These waves are often associated with local density depletion
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| 13. |
- Meeren, H. K. M., et al.
(författare)
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Early Preferential Responses to Fear Stimuli in Human Right Dorsal Visual Stream - A Meg Study
- 2016
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Ingår i: Scientific Reports. - : Springer Science and Business Media LLC. - 2045-2322. ; 6
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Tidskriftsartikel (refereegranskat)abstract
- Emotional expressions of others are salient biological stimuli that automatically capture attention and prepare us for action. We investigated the early cortical dynamics of automatic visual discrimination of fearful body expressions by monitoring cortical activity using magnetoencephalography. We show that right parietal cortex distinguishes between fearful and neutral bodies as early as 80-ms after stimulus onset, providing the first evidence for a fast emotion-attention-action link through human dorsal visual stream.
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| 14. |
- Nordenskjöld, Arvid
(författare)
-
Long-term health hazards from diagnostic X-ray exposure
- 2018
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Medical imaging is an important function in the diagnosis and management of disease and its use have been increasing with technological advancements. A large part of medical imaging uses ionizing radiation as medium for imaging although it does pose potential risks to the patient. Computed Tomography (CT) uses a larger radiation dose than conventional X-rays and technological advances has led to more complex examinations increasing radiation doses even higher. The increased availability of CT machines has also facilitated the increased usage. This means that the population as a whole receives an increasing radiation dose and CT is now the most important contributor to radiation dose from medical examinations. The potential damage from ionizing radiation concerns long-term risks and includes cancer but other effects are known and includes cognitive difficulties amongst children. In study I we investigated the relationship between pelvimetry and negative effects from ionizing radiation on cognitive function expressed as changes in school grades. We examined 1 536 children exposed to pelvimetry in utero and compared them to 44 530 unexposed children. We found no negative effect on school grades when controlling for sex, birth order, mother’s education and birth position. In study II and III we examined the risk of ionizing radiation from CT of the head. We gathered data from a radiological archive in Sweden and collected 26 370 patients. Patients were then matched on age, sex and residence to 4 controls, both cohorts were then linked to national registries in order to gather outcome data. The outcome in study II was meningioma and in study III glioma. We found no evidence of increased risk for neither meningioma nor glioma after CT examinations. However, information in national registries were not enough for exclusion of prevalent tumor at time of first CT or radiotherapy, referral notes were necessary in order to minimize bias. Study IV is a method article and is a description of the international EPI-CT study that aims to investigate children who have had a CT examination. As part of EPI-CT we have collected RIS and PACS data from hospitals in order to assemble the Swedish cohort. This data will then be linked to national registries in order to investigate adverse effects from CT examinations. In conclusion we have not found any negative result on school performance after pelvimetry nor have we found any increased risk for meningioma or glial tumors after CT examination of the head.
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| 15. |
- Rolandsson, Lennart, 1965-
(författare)
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Programmed or Not : A study about programming teachers’ beliefs and intentions in relation to curriculum
- 2015
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- In the intersection of technology, curriculum and intentions, a specific issue of interest is found in the gap between teachers’ intentions and implementations of curriculum. Instead of approaching curriculum and technology as something fait accompli, teachers are considered crucial in the re-discovery of what and how to teach. The thesis depicts the mind-set of teachers and their beliefs in relation to computing curriculum. Three perspectives are covered in the thesis. Based on original documents and interviews with curriculum developers, the enactment of the computing/programming curriculum during the 1970s and 1980s is explored (Paper 1). This historical perspective is supplemented with a perspective from the present day where current teaching practice is explored through teachers’ statements (seminars with associated questionnaires) regarding their beliefs about teaching and learning programming(Paper 2). Finally with a view from a theoretical perspective, teachers’perception of instruction is discussed in relation to a theoretical framework where their intentions in relation to theoretical and practical aspects of knowledge are revealed (Papers 3 & 4). The initial incitement to offer computing education during the 1970s was discovered in the recruitment of a broader group of students within the Natural Science Programme and the perception that it would contribute to the development of students’ ability to think logically and learn problem solving skills. Data concerning teachers’ beliefs about teaching and learning programming unravels an instructional dependence among today’s teachers where students’ logical and analytical abilities (even before the courses start) are considered crucial to students’ learning, while teachers question the importance of their pedagogy. The thesis also discover two types of instruction; a large group putting emphasis on the syntax of programming languages, and a smaller group putting emphasis on the students’ experiences of learning concepts of computer science (not necessarily to do with syntax). In summary the thesis depicts an instructional tradition based on teachers’ beliefs where the historical development of the subject sets the framework for the teaching. Directly and indirectly the historical development and related traditions govern what programming teachers in upper secondary school will/are able to present to their students. From deploying two theoretical approaches, phenomenography and logic of events, upon teacher’s cases it is shown that the intended object of learning (iOoL) is shaped by the teacher’s intentions (e.g., balancing the importance oftheory and practice, using different learning strategies, encouraging learning by trial-and-error and fostering collaboration between students for a deeper understanding). The teachers also present a diverse picture regarding what theoretical knowledge students will reach for.
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| 16. |
- Rolandsson, Lennart, 1965-, et al.
(författare)
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Programming in School : Look Back to Move Forward
- 2014
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Ingår i: ACM Transactions on Computing Education. - : Association for Computing Machinery (ACM). - 1946-6226. ; 14:2, s. 12:1-12:25
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Tidskriftsartikel (refereegranskat)abstract
- In this article, the development of the Swedish informatics curriculum during the 1970s, 1980s and 1990sis studied and described. The study’s design is inspired by the curriculum theory presented by Lindensj¨oand Lundgren [2000], who suggest using the concept of arenas (the arenas of enactment, transformationand realisation) when discussing curriculum development. Data collection in this study comprises activitiesand actors in the arenas of enactment and transformation. Collected data include contemporary articles,journals, reports, booklets, government documents and archived documents. Findings show that informaticseducation in Sweden evolved from primarily focusing on programming knowledge related to automatic dataprocessing and offered exclusively in vocational education (the 1960s and 1970s) to later (early 1980s) beingintroduced in the upper secondary school curriculum under the heading Datakunskap. The enactment of theinformatics curriculum in 1983 encompassed programming, system development and computing in relationto applied sciences and civics. Mathematics teachers did much of the experimental work. It is shown that thecompetencies of upper secondary school teachers at the time rarely corresponded to the demands of the subject(content knowledge, resources and pedagogical skills). Stereotypical examples were therefore developedto support teachers in instructing about the subject content. When implemented in the theoretical naturalscience-programme, system development/systemisation was transformed into a twofold issue, comprisingvocational attributes and societal aspects of computer programming. The implementation of today’s informaticseducation, including programming in the curriculum, should draw from lessons learned from history.For a successful outcome, this study emphasises the necessity to understand 1) the common incentives forintroducing computer programming in the curriculum, 2) the requirement for teachers’ pedagogical contentknowledge and 3) the stakeholders’ role in the curriculum development process.
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| 17. |
- Rolandsson, Lennart, 1965-
(författare)
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Programming with a purpose
- 2020
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Ingår i: 2020 IEEE Frontiers in Education Conference (FIE). - 9781728189611 - 9781728189628
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Konferensbidrag (refereegranskat)abstract
- This research is a full paper problematizing pair programming. The paper highlights how different purposes emerge in a programming activity as three students relate differently to the aesthetic words "ugly" and "efficient". A problematic situation arises when the students pursue separate purposes during the activity, and it proves hard to overcome. This is something the paper discusses by focusing on various disturbances (emotional, intellectual and physical) to highlight the importance of designing collaborative educational activities with a clear-cut purpose, including or excluding the aesthetic value of the code.
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| 18. |
- Rolandsson, Lennart, 1965-
(författare)
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Teacher Pioneers in the Introduction of Computing Technology in Swedish Upper Secondary School
- 2011
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Ingår i: History of Nordic Computing 3Third IFIP WG 9.7 Conference, HiNC 3, Stockholm, Sweden, October 18-20, 2010, Revised Selected Papers. - Boston : Springer. - 9783642233142 ; , s. 159-167
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Konferensbidrag (refereegranskat)abstract
- The paper elaborates on programming and computing 1970 to 1983 in the Swedish upper secondary school. Articles from contemporary journals and firsthand text sources are used. During that period, programming never qualified as a separate subject; it was a tool for problem solving in engineering, economics, and mathematics, and did become a literacy subject in its own right. Early adopters of computers in education became important pioneers in the production of discourses about “how-to” and “what-to” teach. The diffusion of computer technology was substantiated in a curriculum for computing in natural sciences, which embraced programming.
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| 19. |
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