| 711. |
- Johansson, Sandra, et al.
(författare)
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An all solid-state UV source based on a frequency-quadrupled, passively Q-switched 946 nm laser
- 2007
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Ingår i: Optics Express. - 1094-4087. ; 15:2, s. 449-
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Tidskriftsartikel (refereegranskat)abstract
- We report a 236 nm light source with 20 mW of average power based on critically phase-matched second-harmonic generation in a beta-barium borate crystal at room temperature. The fundamental light source was a passively Q-switched 946 nm Nd: YAG laser tunable from 10-38 kHz and with a pulse length of 16 ns. In the generation of 473 nm light, periodically poled KTP and BiBO was compared in terms of conversion efficiency and stability.
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| 712. |
- Johansson, Stefan, et al.
(författare)
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An OFDM Timing Synchronization ASIC
- 2000
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Ingår i: The 7th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2000.. - 0780365429 ; 1, s. 324-327
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Konferensbidrag (refereegranskat)abstract
- In this paper an OFDM timing synchronization ASIC is presented. The proposed synchronization unit can be used in any OFDM system. The algorithm is based on the correlation introduced by the cyclic prefix, which is exploited in the time domain where the time offset is estimated. Although the algorithm is too complex to be implemented on today's most powerful standard DSP, a hardware architecture that is optimized for the algorithm is implemented with moderate complexity. The unit contains 32 kbit RAM and 3000 gates. At the sample rate of 25 Msamples/s the power consumption is 16 mW, which is small for such a complex algorithm
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| 713. |
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| 714. |
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| 715. |
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| 716. |
- Johansson, Stefan, 1980, et al.
(författare)
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Are Mathematics Curricula Harmonizing Globally Over Time? : Evidence from TIMSS National Research Coordinator Data
- 2019
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Ingår i: Eurasia Journal of Mathematics, Science and Technology Education. - : Modestum Publishing Ltd. - 1305-8223. ; 15:2
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Tidskriftsartikel (refereegranskat)abstract
- Given the impact of international large-scale assessments (ILSAs) on policy-making in different educational systems around the world, this study aims to examine whether national mathematics curricula in different educational systems harmonize over time. Data from the Trends in International Mathematics and Science Study (TIMSS) is used to explore this issue. In addition to background questionnaires given to students, teachers and schools, a curriculum questionnaire was completed by each national research coordinator (NRC) in all participating countries in each TIMSS cycle. In the present study, data from 2003, 2007, 2011 and 2015 was used. The analyses focused on the information about the extent to which the national mathematics curriculum covered certain topics in the subdomains of mathematics tested in TIMSS Grade 8. Growth curve modeling and latent profile analyses were applied to uncover the development trend and countries’ unobserved profiles in mathematics content domains of Number, Algebra, Geometry, and Data. Three clusters of countries were identified. Most countries belonged to the same profile in the later cycles of TIMSS. The study found indications of a general harmonization with respect to number of topics covered in countries’ curricula over time, thus contributing to discussions of policy implications of a global curriculum.
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| 717. |
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| 718. |
- Johansson, Stefan, 1963-, et al.
(författare)
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Can Mainstream Smart Technology Support Homeless People Leaving Homelessness?
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- We present a work to create a user-informed practice on how to use smart technology as support for homeless people. The practice challenge traditional methods used by the Social Service Administration, hat may have become obsolete in a digitalized societyThe paper presents and reflects on the process from initial qualitative research, over pilot testing and implementation activities up to the presentation of an implementation-handbook. The paper also presents outcomes of interventions with smart technology conducted during the pilot and implementation phase. 36 of the participating 41 homeless people reported on significant functional improvements and 12 of those labelled them as life-changing improvements.The unique contribution in this paper that we have presented a result on homeless people using smart technology and that such technology can be used in areas where before more costly assistive technology had to be used. Contemporary mainstream devices; smartphones, smartwatches and smart pens together with an assemblage of applications supporting cognitive needs were tested and found useable to fulfil the needs for many homeless people. The cost for such intervention is low and homeless people report on important changes in life when using smart technology. The paper also contributes by describing the Social Service Administrations struggle to adopt to a situation where homeless people want to use digital tools in the interaction.
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| 719. |
- Johansson, Stefan, 1963-, et al.
(författare)
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Co-Designing with Extreme Users : A Framework for User Participation in Design Processes
- 2023
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Ingår i: Scandinavian Journal of Disability Research. - : Stockholm University Press. - 1501-7419 .- 1745-3011. ; 25:1, s. 418-430
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Tidskriftsartikel (refereegranskat)abstract
- The demand for user participation in design processes is increasing, and there is a need to formulate guidance on how to involve disabled users and their representative organisations. Their participation contributes an extreme user perspective to the design process. The aim of this study was to develop an empirically grounded framework for user participation in co-design processes, involving the users with wide range of characteristics. The study was theoretically grounded in ‘participatory design’ and ‘value sensitive design’ and used an exploratory study design with online workshops to iteratively collect and analyse data. All participants collaborated on an online Miro-board to identify themes and formulate guiding principles for the framework. We propose a framework consisting of three themes: participation fundamentals, participation ethics and participation practicalities, entailing 11 guiding principles. By applying this framework, the premises, methods and activities in the design process will be accessible to all participants, and user participation in design projects will become more transparent, equitable and easier to implement. It will enable all users, people with disabilities and others, to participate and contribute to a design that can be used by the widest range of people.
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| 720. |
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