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Search Results: 1 - 10 of 195500 matches for " Thomas E. Nordahl "
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On groups generated by involutions of a semigroup
James East,Thomas E. Nordahl
Mathematics , 2015,
Abstract: An involution on a semigroup S (or any algebra with an underlying associative binary operation) is a function f:S->S that satisfies f(xy)=f(y)f(x) and f(f(x))=x for all x,y in S. The set I(S) of all such involutions on S generates a subgroup C(S)= of the symmetric group Sym(S) on the set S. We investigate the groups C(S) for certain classes of semigroups S, and also consider the question of which groups are isomorphic to C(S) for a suitable semigroup S.
NetTurnP – Neural Network Prediction of Beta-turns by Use of Evolutionary Information and Predicted Protein Sequence Features
Bent Petersen,Claus Lundegaard,Thomas Nordahl Petersen
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0015079
Abstract: β-turns are the most common type of non-repetitive structures, and constitute on average 25% of the amino acids in proteins. The formation of β-turns plays an important role in protein folding, protein stability and molecular recognition processes. In this work we present the neural network method NetTurnP, for prediction of two-class β-turns and prediction of the individual β-turn types, by use of evolutionary information and predicted protein sequence features. It has been evaluated against a commonly used dataset BT426, and achieves a Matthews correlation coefficient of 0.50, which is the highest reported performance on a two-class prediction of β-turn and not-β-turn. Furthermore NetTurnP shows improved performance on some of the specific β-turn types. In the present work, neural network methods have been trained to predict β-turn or not and individual β-turn types from the primary amino acid sequence. The individual β-turn types I, I', II, II', VIII, VIa1, VIa2, VIba and IV have been predicted based on classifications by PROMOTIF, and the two-class prediction of β-turn or not is a superset comprised of all β-turn types. The performance is evaluated using a golden set of non-homologous sequences known as BT426. Our two-class prediction method achieves a performance of: MCC = 0.50, Qtotal = 82.1%, sensitivity = 75.6%, PPV = 68.8% and AUC = 0.864. We have compared our performance to eleven other prediction methods that obtain Matthews correlation coefficients in the range of 0.17 – 0.47. For the type specific β-turn predictions, only type I and II can be predicted with reasonable Matthews correlation coefficients, where we obtain performance values of 0.36 and 0.31, respectively.
Evaluating Environmental Sounds from a Presence Perspective for Virtual Reality Applications
Rolf Nordahl
EURASIP Journal on Audio, Speech, and Music Processing , 2010, DOI: 10.1155/2010/426937
Evaluating Environmental Sounds from a Presence Perspective for Virtual Reality Applications
Nordahl Rolf
EURASIP Journal on Audio, Speech, and Music Processing , 2010,
Abstract: We propose a methodology to design and evaluate environmental sounds for virtual environments. We propose to combine physically modeled sound events with recorded soundscapes. Physical models are used to provide feedback to users' actions, while soundscapes reproduce the characteristic soundmarks of an environment. In this particular case, physical models are used to simulate the act of walking in the botanical garden of the city of Prague, while soundscapes are used to reproduce the particular sound of the garden. The auditory feedback designed was combined with a photorealistic reproduction of the same garden. A between-subject experiment was conducted, where 126 subjects participated, involving six different experimental conditions, including both uni- and bimodal stimuli (auditory and visual). The auditory stimuli consisted of several combinations of auditory feedback, including static sound sources as well as self-induced interactive sounds simulated using physical models. Results show that subjects' motion in the environment is significantly enhanced when dynamic sound sources and sound of egomotion are rendered in the environment.
Plasma creatinine in dogs: intra- and inter-laboratory variation in 10 European veterinary laboratories
Tina Ulleberg, Joris Robben, Kathrine M Nordahl, Thomas Ulleberg, Reidun Heiene
Acta Veterinaria Scandinavica , 2011, DOI: 10.1186/1751-0147-53-25
Abstract: Samples were collected from 10 healthy dogs, 10 dogs with expected intermediate plasma creatinine concentrations, and 10 dogs with azotemia. Overlap was observed for the first two groups. The 30 samples were divided into 3 batches and shipped in random order by postal delivery for plasma creatinine determination. Statistical testing was performed in accordance with ISO standard methodology.Inter- and intra-laboratory variation was clinically acceptable as plasma creatinine values for most samples were usually of the same magnitude. A few extreme outliers caused three laboratories to fail statistical testing for consistency. Laboratory sample means above or below the overall sample mean, did not unequivocally reflect high or low reference intervals in that laboratory.In spite of close analytical results, further standardization among laboratories is warranted. The discrepant reference intervals seem to largely reflect different populations used in establishing the reference intervals, rather than analytical variation due to different laboratory methods.Creatinine is produced in muscle at a constant rate and excreted by the kidney primarily through glomerular filtration; tubular secretion or reabsorption is negligible. Glomerular filtration rate (GFR) is generally considered the most useful parameter for overall evaluation of renal function and can be estimated by use of urine or plasma clearance methods [1-3]. Clearance methods are time-consuming or require expensive laboratory equipment and are therefore not much used in routine clinical practice, nor in patient screening for research. Plasma creatinine is commonly used as a practical indicator of GFR. A major advantage of plasma creatinine is that laboratory analysis is readily available. The international working group, IRIS (International Renal Interest Society) recommends the use of fasting plasma creatinine as an important clinical parameter for staging chronic kidney disease (CKD) in dogs and cats [4].Plasma c
Prediction of Disease Causing Non-Synonymous SNPs by the Artificial Neural Network Predictor NetDiseaseSNP
Morten Bo Johansen, Jose M. G. Izarzugaza, S?ren Brunak, Thomas Nordahl Petersen, Ramneek Gupta
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0068370
Abstract: We have developed a sequence conservation-based artificial neural network predictor called NetDiseaseSNP which classifies nsSNPs as disease-causing or neutral. Our method uses the excellent alignment generation algorithm of SIFT to identify related sequences and a combination of 31 features assessing sequence conservation and the predicted surface accessibility to produce a single score which can be used to rank nsSNPs based on their potential to cause disease. NetDiseaseSNP classifies successfully disease-causing and neutral mutations. In addition, we show that NetDiseaseSNP discriminates cancer driver and passenger mutations satisfactorily. Our method outperforms other state-of-the-art methods on several disease/neutral datasets as well as on cancer driver/passenger mutation datasets and can thus be used to pinpoint and prioritize plausible disease candidates among nsSNPs for further investigation. NetDiseaseSNP is publicly available as an online tool as well as a web service: http://www.cbs.dtu.dk/services/NetDiseas?eSNP
Kulturlivet i en dansk kommune. Steen Bengtsson: Det lokale kulturliv og kommunen
Erik Nordahl Svendsen
Massekultur & Medier , 1981,
Abstract: Kulturlivet i en dansk kommune.
TV-sening i 1988-91 - konkurrencen om seerne
Erik Nordahl Svendsen
MedieKultur : Journal of Media and Communication Research , 1992,
Abstract: Hvad er der sket med danskernes TV-sening i de r, hvor de har haft adgang til 2 danske TV-kanaler? Eller sagt med andre ord, hvordan har konkurrencen om seerne udviklet sig? Siden oktober 1988, da TV2 begyndte, har DR og TV2 samarbejdet om indsamlingen af daglige oplysninger om TV-forbruget. Derfor er det muligt at f et overblik over, hvor mange seere den enkelte kanal dagligt er i kontakt med (d kningen), hvor lang tid befolkningen i gennemsnit bruger p kanalen (seertiden) og hver enkelt kanals andel af den samlede seer- tid. Alle seertal er hentet fra AIMs interviewunders gelser af 500 personer. Fra 1.1.1992 er TV-selskaberne g et over til at anvende AGB Gallerups elektroniske TV-Meters (panel p 500 husstande med ca. 1200 personer). De foreliggende testdata fra december 1991 viser mindre forskelle mellem DR og TV2 end AIM-tallene i artiklen. Nedenst ende artikel er ogs trykt i "Medieforskning i Danmarks Radio 1990".
How to Formulate Relevant and Assessable Learning Outcomes in Statistics  [PDF]
Thomas E. Holgersson
Creative Education (CE) , 2016, DOI: 10.4236/ce.2016.74070
Abstract: Course syllabuses, outlines or similar academic documents specifying the content of a course will often be a helpful tool both for teachers and students to grasp the content and purpose of a course. In many cases, however, the compilation of such documents is a painstaking process for the educator designing it, and is a task that many teachers will shun. In this paper we propose a fairly simple pedagogical model for designing specific learning outcomes that the students are expected to attain after completion of a course.
Alternative Theories, Pedagogy and Education for Fostering Creativity in a Diverse Global World  [PDF]
Gail E. Thomas
Open Journal of Social Sciences (JSS) , 2016, DOI: 10.4236/jss.2016.47033

Fostering creativity and social responsibility in children and youth are essential for more effec- tively addressing society’s most pressing problems. This article proposes alternative pedagogy and methods for fostering creativity and enhancing teaching and learning for creativity. It emphasizes the importance of connecting the goals of teaching creative education to the broader goal of education for social and global responsibility. Two schools attempting to implement the latter are described.

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