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1.
Frederik Verbist Nikos Deligiannis Marc Jacobs Joeri Barbarien Peter Schelkens Adrian Munteanu Jan Cornelis 《Multimedia Tools and Applications》2013,66(3):405-430
Distributed video coding (DVC) constitutes an original coding framework to meet the stringent requirements imposed by uplink-oriented and low-power mobile video applications. The quality of the side information available to the decoder and the efficiency of the employed channel codes are primary factors determining the success of a DVC system. This contribution introduces two novel techniques for probabilistic motion compensation in order to generate side information at the Wyner-Ziv decoder. The employed DVC scheme uses a base layer, serving as a hash to facilitate overlapped block motion estimation at the decoder side. On top of the base layer, a supplementary Wyner-Ziv layer is coded in the DCT domain. Both proposed probabilistic motion compensation techniques are driven by the actual correlation channel statistics and reuse information contained in the hash. Experimental results report significant rate savings caused by the novel side information generation methods compared to previous techniques. Moreover, the compression performance of the presented DVC architecture, featuring the proposed side-information generation techniques, delivers state-of-the-art compression performance. 相似文献
2.
Joeri Engelfriet Heinrich Herre Jan Treur 《Annals of Mathematics and Artificial Intelligence》1998,24(1-4):225-248
In complex reasoning tasks it is often the case that there is no single, correct set of conclusions given some initial information.
Instead, there may be several such conclusion sets, which we will call belief sets. In the present paper we introduce nonmonotonic
belief set operators and selection operators to formalize and to analyze structural aspects of reasoning with multiple belief
sets. We define and investigate formal properties of belief set operators as absorption, congruence, supradeductivity and
weak belief monotony. Furthermore, it is shown that for each belief set operator satisfying strong belief cumulativity there
exists a largest monotonic logic underlying it, thus generalizing a result for nonmonotonic inference operations. Finally,
we study abstract properties of selection operators connected to belief set operators, which are used to choose some of the
possible belief sets.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
3.
This work presents a modified TSR model of the nitric oxide/hydrogen fuel cell operating in potentiostatic mode with the co-current flow direction. The developed model accounts for the component and the energy balances in gas channels, liquid catholyte and catalyst layers together with charge balances at electrode/electrolyte interfaces. The simulation results indicate the influence of catalyst selectivity and mass transfer on the distribution of concentration, temperature and current density. 相似文献
4.
Maria Mytiliniou Joeri A. J. Wondergem Thomas Schmidt Doris Heinrich 《Journal of the Royal Society Interface》2022,19(187)
Intracellular transport is pivotal for cell growth and survival. Malfunctions in this process have been associated with devastating neurodegenerative diseases, highlighting the need for a deeper understanding of the mechanisms involved. Here, we use an experimental methodology that leads neurites of differentiated PC12 cells into either one of two configurations: a one-dimensional configuration, where the neurites align along lines, or a two-dimensional configuration, where the neurites adopt a random orientation and shape on a flat substrate. We subsequently monitored the motion of functional organelles, the lysosomes, inside the neurites. Implementing a time-resolved analysis of the mean-squared displacement, we quantitatively characterized distinct motion modes of the lysosomes. Our results indicate that neurite alignment gives rise to faster diffusive and super-diffusive lysosomal motion than the situation in which the neurites are randomly oriented. After inducing lysosome swelling through an osmotic challenge by sucrose, we confirmed the predicted slowdown in diffusive mobility. Surprisingly, we found that the swelling-induced mobility change affected each of the (sub-/super-)diffusive motion modes differently and depended on the alignment configuration of the neurites. Our findings imply that intracellular transport is significantly and robustly dependent on cell morphology, which might in part be controlled by the extracellular matrix. 相似文献
5.
Noshin Omar Hamid Gualous Justin Salminen Grietus Mulder Ahmadou Samba Yousef Firouz Mohamed Abdel Monem Peter Van den Bossche Joeri Van Mierlo 《Journal of Applied Electrochemistry》2014,44(4):509-522
This paper represents an assessment of the main ageing phenomena in electrical double-layer capacitors (EDLCs). In this study the cycle life of the EDLC cells with a rated capacitance of 1,600 F has been investigated at different ambient temperatures and current rates. From the experimental results we can observe that the impact of the high ambient temperature is significant on the cycle life of the cells. Moreover, the results also show the negative impact of the current rate. The internal resistance tests showed that the increase of the resistance is much higher than the decrease of the capacitance. Thus, the ageing of the EDLC during cycling was clearly non-linear. Further the EIS measurements indicated the higher increase of the imaginary part of the impedance at low frequencies during cycling, which indicates the capacitance fade. 相似文献
6.
Belgin BozbiyikValery A. Danilov Joeri Denayer 《International Journal of Hydrogen Energy》2011,36(22):14552-14561
This study presents an improved Tank in Series Reactor (TSR) Proton Exchange Membrane (PEM) fuel cell model with mass and energy balance equations accounting for evaporation and condensation in cathode channels. The TSR model includes the modified charge balance equation suitable for potentiostatic fuel cell operation mode. Polarization curves calculated with the improved model agree with experimental data from the literature. The developed TSR model is able to predict the limiting two-dimensional profiles in PEMFC. Simulation results illustrate the influence of co-current and counter current mode on PEM fuel cell performance. 相似文献
7.
The notion of a graph type is introduced by a collection of axioms. A graph of type (or -graph) is defined as a set of edges, of which the structure is specified by . From this, general notions of subgraph and isomorphism of -graphs are derived. A Cantor-Bernstein (CB) result for -graphs is presented as an illustration of a general proof for different types of graphs. By definition, a relation on -graphs satisfies the CB property if and imply that A and B are isomorphic. In general, the relation ‘isomorphic to a subgraph’ does not satisfy the CB property. However, requiring
the subgraph to be disconnected from the remainder of the graph, a relation that satisfies the CB property is obtained. A
similar result is shown for -graphs with multiple edges.
Received: 25 October 1996 / 5 February 1998 相似文献
8.
An attribute grammar is simple multi-visit if each attribute of a nonterminal has a fixed visit-number associated with it such that, during attribute evaluation, the attributes of a node which have visit-number j are computed at the jth visit to the node. An attribute grammar is l-ordered if for each nonterminal a linear order of its attributes exists such that the attributes of a node can always be evaluated in that order (cf. the work of Kastens).An attribute grammar is simple multi-visit if and only if it is l-ordered. Every noncircular attribute grammar can be transformed into an equivalent simple multi-visit attribute grammar which uses the same semantic operations.For a given distribution of visit-numbers over the attributes, it can be decided in polynomial time whether the attributes can be evaluated according to these visit-numbers. The problem whether an attribute grammar is simple multi-visit is NP-complete. 相似文献
9.