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Transitions to Chaos and Chaos Synchronization for Solitons in the Presence of Spatially Inhomogeneous Forces

100%
Fronczak P., Hołyst J.
Acta Physica Polonica A
|
2002
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vol. 101
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issue 4
465-476
EN
Motion of kink solitons in the φ^4 model in the presence of external spatially inhomogeneous forces is studied. Depending on the system parameters various routes to chaos, i.e. Feigenbaum's scenario, type-I intermittency, and chaos-chaos intermittency are observed. Synchronization of chaotic solitons is investigated.
2
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Spanning Trees of the World Trade Web: Real-World Data and the Gravity Model of Trade

81%
Skowron P., Karpiarz M., Fronczak A., Fronczak P.
Acta Physica Polonica A
|
2015
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vol. 127
|
issue 3A
A-123-A-128
EN
In this paper, we investigate the statistical features of the weighted international-trade network. By finding the maximum weight spanning trees for this network we make the extraction of the truly relevant connections forming the network's backbone. We discuss the role of large-sized countries (strongest economies) in the tree. Finally, we compare the topological properties of this backbone to the maximum weight spanning trees obtained from the gravity model of trade. We show that the model correctly reproduces the backbone of the real-world economy.
3
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On-Line Noise Suppression for Enhancing Speech Recognition

81%
Urbanowicz K., Fronczak P., Hołyst J.
Acta Physica Polonica A
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2009
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vol. 116
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issue 2
119-126
EN
An experimental setup has been designed that makes possible a real-time noise reduction and an increase of automatic word recognition rate. The applied algorithm uses a dynamical filtering method for investigated time-series and has been implemented in Spartan 3 FPGA evaluation board RC10 made by Celoxica. We show that our approach increases the number of correctly recognized words in the commercial speech recognition program ViaVoice 10.
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