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Department of Applied Physics
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Department of Biotechnology and Chemical Technology
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Department of Industrial Engineering and Management
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    ABSTRACT: We discuss the importance of timing in brain function: how temporal dynamics of the world has left its traces in the brain during evolution and how we can monitor the dynamics of the human brain with non-invasive measurements. Accurate timing is important for the interplay of neurons, neuronal circuitries, brain areas and human individuals. In the human brain, multiple temporal integration windows are hierarchically organized, with temporal scales ranging from microseconds to tens and hundreds of milliseconds for perceptual, motor and cognitive functions, and up to minutes, hours and even months for hormonal and mood changes. Accurate timing is impaired in several brain diseases. From the current repertoire of non-invasive brain imaging methods, only magnetoencephalography (MEG) and scalp electroencephalography (EEG) provide millisecond time-resolution; our focus in this paper is on MEG. Since the introduction of high-density whole-scalp MEG/EEG coverage in the 1990s, the instrumentation has not changed drastically; yet, novel data analyses are advancing the field rapidly by shifting the focus from the mere pinpointing of activity hotspots to seeking stimulus- or task-specific information and to characterizing functional networks. During the next decades, we can expect increased spatial resolution and accuracy of the time-resolved brain imaging and better understanding of brain function, especially its temporal constraints, with the development of novel instrumentation and finer-grained, physiologically inspired generative models of local and network activity. Merging both spatial and temporal information with increasing accuracy and carrying out recordings in naturalistic conditions, including social interaction, will bring much new information about human brain function.
    Philosophical Transactions of The Royal Society B Biological Sciences 05/2015; 370(1668). DOI:10.1098/rstb.2014.0170
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    ABSTRACT: A numerical approach to modelling contact problems with a unified friction and cohesion interface is formulated. A new nonlinear friction law is suggested for modelling micro-slip of metallic junctions due to contact asperities, and an associated cohesive zone due to adhesion describes the linear portion of the unified total interfacial hysteresis. A variational equality including both the regularized friction and cohesion terms is formulated for the numerical solution of the derived boundary value problem. The suggested modelling technique is readily implementable in the finite element method. There is an application on the representative problem involving the adhesively bonded and significantly normal-stressed contact surface. Macroscopic constitutive relationships between the cyclic tangential load and micro-displacements are established for the set of constant compressive normal loads. The related micromechanical arguments and experimental observations supporting the modelling theory are addressed.
    European Journal of Mechanics - A/Solids 02/2015; 49:205–213. DOI:10.1016/j.euromechsol.2014.08.002
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    ABSTRACT: A power outage brings in economic losses for both the customers and the utilities. Studying these unwanted events and making solid predictions about the outcomes of the interruptions has been an attractive area of interest for the researchers for the last couple of decades. By making use of a customer survey study conducted in Finland, this paper benefits from both the reported cost data collected from customers and from the analytical data that are available and then presents a new hybrid approach to estimate the customer interruption costs of service sector customer segment. Making use of Value Added information of the customers is a common practice for the cost normalization purposes. This paper verifies the approach by comparing the findings of the customer survey and the econometric model suggested here. This study is a unique source in terms of providing a reliable, easy to apply, and a straightforward model for calculating the economic impacts of power outages.
    International Journal of Electrical Power & Energy Systems 01/2015; 64:588–595. DOI:10.1016/j.ijepes.2014.07.046


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Top publications last week by reads

the 47th Hawaii International Conference on System Sciences, Hawaii, USA; 01/2014
154 Reads
Canadian Journal of Remote Sensing 12/2013; 39(5):382–395. DOI:10.5589/m13-046
96 Reads

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