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Search Results: 1 - 10 of 198 matches for " Ilkka Maunu; "
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Virtual worlds, fiction, and reality
Niiniluoto,Ilkka Maunu;
Discusiones Filosóficas , 2011,
Abstract: my aim in this paper is to raise and discuss some philosophical questions about virtual reality (vr). the most fundamental problem concerns the ontological nature of vr: is it real or fictional? is vr comparable to illusions, hallucinations, dreams, or worlds of fiction? are traditional philosophical categories at all sufficient to give us understanding of the phenomenon of vr? in approaching these questions, i shall employ possible world semantics and logical theories of perception and imagination as my philosophical tools. my main conclusion is that vr is comparable to a 3-d picture which can be seen from the inside.
Fast algorithm for robust subspace recovery
Gilad Lerman,Tyler Maunu
Computer Science , 2014,
Abstract: This paper presents a fast algorithm for robust subspace recovery. The datasets considered include points drawn around a low-dimensional subspace of a higher dimensional ambient space, and a possibly large portion of points that do not lie nearby this subspace. The proposed algorithm, which we refer to as Fast Median Subspace (FMS), is designed to robustly determine the underlying subspace of such datasets, while having lower computational complexity than existing methods. Numerical experiments on synthetic and real data demonstrate its competitive speed and accuracy.
Pressurised Water Reactor Control by the Hierarchical Method
Ilkka Leikkonen
Modeling, Identification and Control , 1987, DOI: 10.4173/mic.1987.2.1
Abstract: A simple version of the hierarchical optimization method is used to solve the control problem for the power distribution of a pressurized water reactor. The control period is about twenty hours. The control objectives include the total power, power distribution and use of boron. The controllers are a rod bank, soluble boron in the coolant and the coolant temperature deviation. A one-dimensional non-linear core model is used, with full xenon-iodine dynamics.
Pulse palpation and limited joint mobility examination are better indicators than oscillometric measurement for diagnosing abnormal ankle-brachial index  [PDF]
Laura Rantamaula, Juha Varis, Ilkka Kantola
World Journal of Cardiovascular Diseases (WJCD) , 2014, DOI: 10.4236/wjcd.2014.42013
Abstract:

Background: Peripheral artery disease (PAD) is the least recognized form of atherosclerosis and may even result in amputation if the diagnosis is delayed. Manual pulse palpation is the traditional way to diagnose PAD. Doppler ultrasonographic measurement of ankle-brachial index (ABI) is the gold standard diagnosing method but requires training and is not necessarily available as an outpatient procedure. Using automated oscillometric blood pressure devices has been suggested as an easier method for measuring the ABI. Methods: A single observer palpated the arterial dorsalis pedis, examined hand joints and measured the ABI of one hundred diabetic patients using both Doppler and oscillometric methods. The purpose of this study was to compare the oscillometric method and the manual diagnosing methods to the gold standard method of using a hand held Doppler device for measuring the ABI and detecting PAD. Results: ABI was abnormal in 24 patients (24%) (22 males, 2 females) when measured with the Doppler method. Of these 24 patients, the oscillometric method would have missed 12 giving 12 false negatives. We found that the sensitivity of the oscillometric method was 50.0% and specificity 90.8%. Clinical examination with palpation of ADP combined with limited joint mobility (LJM) scoring would have missed only four cases. Conclusions: Although the oscillometric method is easy and accessible, it is not sensitive enough to be used as the only method in measuring ABI. The simple and inexpensive ADP pulse palpation combined with testing for LMJ was able to find 20 of the 24 (83%) patients with an abnormal ABI measured by Doppler stethoscope.

A Massively Parallel Face Recognition System
Olli Lahdenoja,Mika Laiho,Janne Maunu,Ari Paasio
EURASIP Journal on Embedded Systems , 2006, DOI: 10.1155/2007/72316
Abstract: We present methods for processing the LBPs (local binary patterns) with a massively parallel hardware, especially with CNN-UM (cellular nonlinear network-universal machine). In particular, we present a framework for implementing a massively parallel face recognition system, including a dedicated highly accurate algorithm suitable for various types of platforms (e.g., CNN-UM and digital FPGA). We study in detail a dedicated mixed-mode implementation of the algorithm and estimate its implementation cost in the view of its performance and accuracy restrictions.
A Massively Parallel Face Recognition System
Lahdenoja Olli,Laiho Mika,Maunu Janne,Paasio Ari
EURASIP Journal on Embedded Systems , 2007,
Abstract: We present methods for processing the LBPs (local binary patterns) with a massively parallel hardware, especially with CNN-UM (cellular nonlinear network-universal machine). In particular, we present a framework for implementing a massively parallel face recognition system, including a dedicated highly accurate algorithm suitable for various types of platforms (e.g., CNN-UM and digital FPGA). We study in detail a dedicated mixed-mode implementation of the algorithm and estimate its implementation cost in the view of its performance and accuracy restrictions.
Molecular-Level Variation Affects Population Growth in a Butterfly Metapopulation
Ilkka Hanski,Ilik Saccheri
PLOS Biology , 2012, DOI: 10.1371/journal.pbio.0040129
Abstract: The dynamics of natural populations are thought to be dominated by demographic and environmental processes with little influence of intraspecific genetic variation and natural selection, apart from inbreeding depression possibly reducing population growth in small populations. Here we analyse hundreds of well-characterised local populations in a large metapopulation of the Glanville fritillary butterfly (Melitaea cinxia), which persists in a balance between stochastic local extinctions and recolonisations in a network of 4,000 discrete habitat patches. We show that the allelic composition of the glycolytic enzyme phosphoglucose isomerase (Pgi) has a significant effect on the growth of local populations, consistent with previously reported effects of allelic variation on flight metabolic performance and fecundity in the Glanville fritillary and Colias butterflies. The strength and the sign of the molecular effect on population growth are sensitive to the ecological context (the area and spatial connectivity of the habitat patches), which affects genotype-specific gene flow and the influence of migration on the dynamics of local populations. The biological significance of the results for Pgi is underscored by lack of any association between population growth and allelic variation at six other loci typed in the same material. In demonstrating, to our knowledge for the first time, that molecular variation in a candidate gene affects population growth, this study challenges the perception that differential performance of individual genotypes, leading to differential fitness, is irrelevant to population dynamics. These results also demonstrate that the spatial configuration of habitat and spatial dynamics of populations contribute to maintenance of Pgi polymorphism in this species.
Sounds of Silence. Mystical Paradox in the Atthakavagga
Ilkka Pyysi?inen
Folklore : Electronic Journal of Folklore , 2000,
Abstract:
Kognitiivne usundilugu
Ilkka Pyysi?inen
M?etagused. Hüperajakiri , 2000,
Abstract: The article is concerned with a scientific approach which emerged in the 1990s and uses scientific results in psychology, linguistics, neurology and other sciences for studying religious convictions and behaviour. Cultural anthropology tends to explain religious beliefs through cultural context , but this has often proved insufficient: beliefs also reflect the essence of human perception. The spectrum of religious ideas not unlimited as the ideas are based on human cognitive structures. The author makes a reference to Boyer by categorising the forms of perception into intuitive and counterintuitive . Pyysi inen concludes that specifically religious cognitive mechanisms do not exist. Religious reasoning and behaviour can be explained without reference to God's revelation. By that the author does not claim that revealed perception does not exist, but that it cannot be distinguished from natural perception.
Team Exploratory Testing Sessions
Soili Saukkoriipi,Ilkka Tervonen
ISRN Software Engineering , 2012, DOI: 10.5402/2012/324838
Abstract:
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