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Browsing by Author "Ulfarsson, Magnus"

Browsing by Author "Ulfarsson, Magnus"

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  • Ulfarsson, Magnus; Walters, G B; Gústafsson, O; Steinberg, S; Silva, A; Doyle, O M; Brammer, M; Gudbjartsson, Daniel; Arnarsdóttir, S; Jonsdottir, Gudbjorg; Gísladóttir, R S; Bjornsdottir, Gyda; Helgason, H; Ellingsen, L M; Halldórsson, J G; Sæmundsen, Evald E.; Stefánsdóttir, B; Jónsson, L; Eiríksdóttir, V K; Eiríksdóttir, G R; Jóhannesdóttir, G H; Unnsteinsdóttir, U; Jónsdóttir, B; Magnúsdóttir, B B; sulem, patrick; Þorsteinsdóttir, Unnur; Sigurðsson, E; Brandeis, D; Meyer-Lindenberg, A; Stefánsson, H; Stefansson, Kari (Springer Nature, 2017-04-25)
    Several copy number variants have been associated with neuropsychiatric disorders and these variants have been shown to also influence cognitive abilities in carriers unaffected by psychiatric disorders. Previously, we associated the 15q11.2(BP1–BP2) ...
  • Aufaristama, Muhammad; Höskuldsson, Ármann; Ulfarsson, Magnus; Jónsdóttir, Ingibjörg; Thordarson, Thorvaldur (MDPI AG, 2019-02-26)
    The Holuhraun lava flow was the largest effusive eruption in Iceland for 230 years, with an estimated lava bulk volume of ~1.44 km3 and covering an area of ~84 km2. The six month long eruption at Holuhraun 2014–2015 generated a diverse surface environment. ...
  • Jónsson, Benedikt Atli; Bjornsdottir, Gyda; Thorgeirsson, Thorgeir; Ellingsen, Lotta María; Walters, G. Bragi; Gudbjartsson, Daniel; Stefansson, Hreinn; Stefansson, Kari; Ulfarsson, Magnus (Springer Science and Business Media LLC, 2019-11-27)
    Machine learning algorithms can be trained to estimate age from brain structural MRI. The difference between an individual’s predicted and chronological age, predicted age difference (PAD), is a phenotype of relevance to aging and brain disease. Here, ...
  • Rasti, Behnood; Ghamisi, Pedram; Ulfarsson, Magnus (MDPI AG, 2019-01-10)
    In this paper, we develop a hyperspectral feature extraction method called sparse and smooth low-rank analysis (SSLRA). First, we propose a new low-rank model for hyperspectral images (HSIs) where we decompose the HSI into smooth and sparse components. ...
  • Palsson, Burkni; Sigurdsson, Jakob; Sveinsson, Jóhannes Rúnar; Ulfarsson, Magnus (Institute of Electrical and Electronics Engineers (IEEE), 2018)
    In this paper, we present a deep learning based method for blind hyperspectral unmixing in the form of a neural network autoencoder. We show that the linear mixture model implicitly puts certain architectural constraints on the network, and it effectively ...
  • Aufaristama, Muhammad; Höskuldsson, Ármann; Ulfarsson, Magnus; Jónsdóttir, Ingibjörg; Thordarson, Thorvaldur (MDPI AG, 2020-03-31)
    Roughness can be used to characterize the morphologies of a lava flow. It can be used to identify lava flow features, provide insight into eruption conditions, and link roughness pattern across a lava flow to emplacement conditions. In this study, we ...
  • Walters, G. Bragi; Gústafsson, Ómar; Sveinbjornsson, Gardar; Eiriksdottir, Valgerdur Kristin; Ágústsdóttir, Arna B.; Jónsdóttir, Guðrún A.; Steinberg, Stacy; Gunnarsson, Árni F.; Magnússon, Magnús I.; Unnsteinsdóttir, Unnur; Lee, Amy L.; Jónasdóttir, Aðalbjörg; Sigurðsson, Ásgeir; Jónasdóttir, Áslaug; Skúladóttir, Ástrós; Jonsson, Lina; Nawaz, Muhammad S.; Sulem, Patrick; Frigge, Mike; Ingason, Andrés; Love, Askell; Norðdahl, Guðmundur L.; Zervas, Mark; Gudbjartsson, Daniel; Ulfarsson, Magnus; Sæmundsen, Evald E.; Stefansson, Hreinn; Stefansson, Kari (Springer Science and Business Media LLC, 2018-08-27)
    Discovery of coding variants in genes that confer risk of neurodevelopmental disorders is an important step towards understanding the pathophysiology of these disorders. Wholegenome sequencing of 31,463 Icelanders uncovers a frameshift variant ...
  • Aufaristama, Muhammad; Höskuldsson, Ármann; Jónsdóttir, Ingibjörg; Ulfarsson, Magnus; Thordarson, Thorvaldur (MDPI AG, 2018-01-20)
    A new lava field was formed at Holuhraun in the Icelandic Highlands, north of Vatnajökull glacier, in 2014–2015. It was the largest effusive eruption in Iceland for 230 years, with an estimated lava bulk volume of ~1.44 km3 covering an area of ~84 km2. ...
  • Silva, Ana I.; Ulfarsson, Magnus; Stefansson, Hreinn; Gústafsson, Ómar; Walters, G. Bragi; Linden, David E.J.; Wilkinson, Lawrence S.; Drakesmith, Mark; Owen, Michael J.; Hall, Jeremy; Stefansson, Kari (Elsevier BV, 2019-04-01)
    Background: The 15q11.2 BP1-BP2 cytogenetic region has been associated with learning and motor delays, autism, and schizophrenia. This region includes a gene that codes for the cytoplasmic FMR1 interacting protein 1 (CYFIP1). The CYFIP1 protein is ...
  • Palsson, Frosti; Sveinsson, Jóhannes Rúnar; Ulfarsson, Magnus (MDPI AG, 2018-08-15)
    Single sensor fusion is the fusion of two or more spectrally disjoint reflectance bands that have different spatial resolution and have been acquired by the same sensor. An example is Sentinel-2, a constellation of two satellites, which can acquire ...
  • Benediktsson, Jon Atli; Ulfarsson, Magnus; Ghamisi, Pedram (IEEE, 2014)
    Hyperspectral remote sensing technology allows one to acquire a sequence of possibly hundreds of contiguous spectral images from ultraviolet to infrared. Conventional spectral classifiers treat hyperspectral images as a list of spectral measurements ...
  • Aufaristama, Muhammad; Höskuldsson, Ármann; Jónsdóttir, Ingibjörg; Ulfarsson, Magnus; Erlangga, I G D; Thordarson, Thorvaldur (IOP Publishing, 2019-08-14)
    In the beginning of December 2017, Mt. Agung eruption powered down to minor ash emissions and on the middle of December, aerial photographs of the crater were taken by Indonesia Centre of Volcanology and Geological Hazard Mitigation (PVMBG) showing a ...