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- Andersson, Tommy
(författare)
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Moment-method calculations of scattering by a square plate using singular basis functions and multipole expansions
- 1993
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Ingår i: Journal Electromagnetic Waves and Applications. - 1569-3937. ; 7:1, s. 93-121
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Tidskriftsartikel (refereegranskat)abstract
- The method of moments is used to solve electromagenetic boundary value problems numerically. It is known that the choice of basis functions is crucial for the numerical efficiency. Fast convergence is achieved provided the basis functions efficiently approximate the unknown function. In this paper the far field (incl. RCS) of a thin square conducting plate is calculated. Basis functions with correct edge and corner singularities are shown to greatly enhance the convergence compared to ordinary "rooftop" functions. The calculations of the matrix elements as well as the right side of the matrix equation and the scattered field are simplified by the use of a multipole technique.
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| 2. |
- Abid, Nosheen, 1993-, et al.
(författare)
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UCL: Unsupervised Curriculum Learning for Water Body Classification from Remote Sensing Imagery
- 2021
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Ingår i: International Journal of Applied Earth Observation and Geoinformation. - : Elsevier. - 1569-8432 .- 1872-826X. ; 105
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents a Convolutional Neural Networks (CNN) based Unsupervised Curriculum Learning approach for the recognition of water bodies to overcome the stated challenges for remote sensing based RGB imagery. The unsupervised nature of the presented algorithm eliminates the need for labelled training data. The problem is cast as a two class clustering problem (water and non-water), while clustering is done on deep features obtained by a pre-trained CNN. After initial clusters have been identified, representative samples from each cluster are chosen by the unsupervised curriculum learning algorithm for fine-tuning the feature extractor. The stated process is repeated iteratively until convergence. Three datasets have been used to evaluate the approach and show its effectiveness on varying scales: (i) SAT-6 dataset comprising high resolution aircraft images, (ii) Sentinel-2 of EuroSAT, comprising remote sensing images with low resolution, and (iii) PakSAT, a new dataset we created for this study. PakSAT is the first Pakistani Sentinel-2 dataset designed to classify water bodies of Pakistan. Extensive experiments on these datasets demonstrate the progressive learning behaviour of UCL and reported promising results of water classification on all three datasets. The obtained accuracies outperform the supervised methods in domain adaptation, demonstrating the effectiveness of the proposed algorithm.
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| 3. |
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| 4. |
- Alexopoulou, Sofia, 1984-
(författare)
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The portrait of older people as (non) users of digital technologies: A scoping literature review and a typology of digital older (non) users
- 2020
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Ingår i: Gerontechnology. - : International Society for Gerontechnology. - 1569-1101 .- 1569-111X. ; 19:3, s. 1-15
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Forskningsöversikt (refereegranskat)abstract
- Background: The images of older people while using (or not) technology is a theme that plays a crucial role not only in the implementation of policies, but also in the design of e-services or more broadly e-governance. Older people is a complex and a non-homogenous group that requires public (welfare) services which in many cases have been moved to a digital interface. The real challenge is to provide these services without excluding anyone.Objective: This paper aims to investigate how older people are represented as (non)users of technology in the digital literature and public discourse and to produce a typology of older digital users based on the work of Schneider and Ingram (1993). Method: The study followed established methods for a scoping literature review to discover the profile of older digital (non) users and their relationship with technology. Results: Based on this literature review, two positive profiles of different power were found: the silver surfers or “athletes” who are proficient digital users and the “older people with borrowed access” to digital technologies who are less powerful and independent while using technology. On the other hand, we also found some negative images of older adults: the “laidback” who are reluctant to use digital technologies but they have the necessary intellectual capacity to acquire IT skills on their own (strong in terms of power). The biggest group entails older people as technophobic, non-users, want-nots, digitally backward/internet laggards, digital immigrants, needy and those who are unaware of their digital condition.Conclusion: This research could offer a substantial contribution to policy-makers and public servants to provide better and friendlier online services, digital tools and applications in conjunction with the supply of IT courses for older individuals.
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| 5. |
- Bahmanyar, Shahram, et al.
(författare)
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Cystic fibrosis gene mutations and gastrointestinal diseases
- 2010
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Ingår i: Journal of Cystic Fibrosis. - : Elsevier BV. - 1569-1993 .- 1873-5010. ; 9:4, s. 288-291
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Tidskriftsartikel (refereegranskat)abstract
- Background: This study examined if CF mutation heterozygosity is associated with diseases of gastrointestinal epithelial barrier function. Design and methods: Swedish registers identified 865 patients with a diagnosis of CF between 1968 and 2003 and matched with 8101 individuals without CF. Gastrointestinal disease risk was examined among 1534 biological parents and 1396 siblings of CF patients, compared with 15,526 parents and 15,542 siblings of individuals without CF. Results: First-degree relatives of CF patients were not at lower risk of the gastrointestinal diseases, in contrast with a raised risk among CF patients. Conclusion: Heterozygosity for CF gene mutations does not protect against gastrointestinal diseases where impaired barrier function may be relevant. (C) 2010 European Cystic Fibrosis Society. Published by Elsevier B.V. All rights reserved.
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| 8. |
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| 9. |
- Bresso, F, et al.
(författare)
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The cystic fibrosis F508del mutation in Crohn's disease
- 2011
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Ingår i: Journal of cystic fibrosis : official journal of the European Cystic Fibrosis Society. - : Elsevier BV. - 1873-5010. ; 10:2, s. 132-132
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 10. |
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