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Complex activity patterns generated by short-term synaptic plasticity [article]

Bulcsú Sándor, Claudius Gros
<span title="2018-03-14">2018</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
Short-term synaptic plasticity (STSP) affects the efficiency of synaptic transmission for persistent presynaptic activities. We consider attractor neural networks, for which the attractors are given, in the absence of STSP, by cell assemblies of excitatory cliques. We show that STSP may transform these attracting states into attractor relics, inducing ongoing transient-state dynamics in terms of sequences of transiently activated cell assemblies, the former attractors. Subsequent cell
more &raquo; ... may be both disjoint or partially overlapping. It may hence be possible to use the resulting dynamics for the generation of motor control sequences.
<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1803.05369v1">arXiv:1803.05369v1</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/2k2mtvbmabe3hiwu6w3bvpwjea">fatcat:2k2mtvbmabe3hiwu6w3bvpwjea</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20191016123646/https://arxiv.org/pdf/1803.05369v1.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/aa/c2/aac20b919da7c6862a2b9af419b13c3e1ee0255c.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1803.05369v1" title="arxiv.org access"> <button class="ui compact blue labeled icon button serp-button"> <i class="file alternate outline icon"></i> arxiv.org </button> </a>

Embodied robots driven by self-organized environmental feedback [article]

Frederike Kubandt, Michael Nowak, Tim Koglin, Claudius Gros, Bulcsu Sandor
<span title="2019-05-17">2019</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
Which kind of complex behavior may arise from self-organizing principles? We investigate this question for the case of snake-like robots composed of passively coupled segments, with every segment containing two wheels actuated separately by a single neuron. The robot is self organized both on the level of the individual wheels and with respect to inter-wheel coordination, which arises exclusively from the mechanical coupling of the individual wheels and segments. For the individual wheel, the
more &raquo; ... nerating principle proposed results in locomotive states that correspond to self-organized limit cycles of the sensorimotor loop. Our robot interacts with the environment by monitoring the state of its actuators, that is via propriosensation. External sensors are absent. In a structured environment the robot shows complex emergent behavior that includes pushing movable blocks around, reversing direction when hitting a wall and turning when climbing a slope. On flat grounds the robot wiggles in a snake-like manner, when moving at higher velocities. We also investigate the emergence of motor primitives, viz the route to locomotion, which is characterized by a series of local and global bifurcations in terms of dynamical system theory.
<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1905.07153v1">arXiv:1905.07153v1</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/rzeawswjo5d6pe5yr6lg4h6aa4">fatcat:rzeawswjo5d6pe5yr6lg4h6aa4</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20200826081927/https://arxiv.org/pdf/1905.07153v1.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/d2/4d/d24db90484f655c24f42542b428ae82a78c53196.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1905.07153v1" title="arxiv.org access"> <button class="ui compact blue labeled icon button serp-button"> <i class="file alternate outline icon"></i> arxiv.org </button> </a>

Synchronization patterns in rings of time-delayed Kuramoto oscillators [article]

Károly Dénes, Bulcsú Sándor, Zoltán Néda
<span title="2020-03-31">2020</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
Phase-locked states with a constant phase shift between the neighboring oscillators are studied in rings of identical Kuramoto oscillators with time-delayed nearest-neighbor coupling. The linear stability of these states is derived and it is found that the stability maps for the dimensionless equations show a high level of symmetry. The size of the attraction basins is numerically investigated. These sizes are changing periodically over several orders of magnitude as the parameters of the model
more &raquo; ... are varied. Simple heuristic arguments are formulated to understand the changes in the attraction basin sizes and to predict the most probable states when the system is randomly initialized.
<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/2003.14369v1">arXiv:2003.14369v1</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/essoqeamnjcplfceubena3uyjy">fatcat:essoqeamnjcplfceubena3uyjy</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20200402011218/https://arxiv.org/pdf/2003.14369v1.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] </button> </a> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/2003.14369v1" title="arxiv.org access"> <button class="ui compact blue labeled icon button serp-button"> <i class="file alternate outline icon"></i> arxiv.org </button> </a>

Limit cycles with transient state dynamics in cyclic networks

Bulcsú Sándor, Claudius Gros
<span title="">2015</span> <i title="Springer Nature"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/hus553nnwfhsbi2wiivfjdwxru" style="color: black;">BMC Neuroscience</a> </i> &nbsp;
Sándor and Gros BMC Neuroscience 2015, 16(Suppl 1):P89  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1186/1471-2202-16-s1-p89">doi:10.1186/1471-2202-16-s1-p89</a> <a target="_blank" rel="external noopener" href="https://pubmed.ncbi.nlm.nih.gov/PMC4697609/">pmcid:PMC4697609</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/shjfm7ur2fbdhihag62gf2s3ma">fatcat:shjfm7ur2fbdhihag62gf2s3ma</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20170816142519/https://bmcneurosci.biomedcentral.com/track/pdf/10.1186/1471-2202-16-S1-P89?site=bmcneurosci.biomedcentral.com" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/c7/fd/c7fd86c439c5fc398f25d6533c61b6c661edd28b.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1186/1471-2202-16-s1-p89"> <button class="ui left aligned compact blue labeled icon button serp-button"> <i class="unlock alternate icon" style="background-color: #fb971f;"></i> springer.com </button> </a> <a target="_blank" rel="external noopener" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4697609" title="pubmed link"> <button class="ui compact blue labeled icon button serp-button"> <i class="file alternate outline icon"></i> pubmed.gov </button> </a>

Pattern selection in a ring of Kuramoto oscillators [article]

Károly Dénes, Bulcsú Sándor, Zoltán Néda
<span title="2019-01-22">2019</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
Emergence of generalized synchronization patterns in a ring of identical and locally coupled Kuramoto-type rotators are investigated by different methods. These approaches offer a useful visual picture for understanding the complexity of the dynamics in the high dimensional state-space of this system. Beside the known stable stationary points novel unstable states are revealed. We find that the prediction of the final stationary state is limited by the presence of such saddle points. This is
more &raquo; ... ustrated by considering and comparing two different attempts for forecasting the final stationary state
<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1801.03028v2">arXiv:1801.03028v2</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/h5y3sz4iq5fljgpdcpgksy6ug4">fatcat:h5y3sz4iq5fljgpdcpgksy6ug4</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20191026051459/https://arxiv.org/pdf/1801.03028v2.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/21/45/2145229c7fabf7355d724737cf4e299d3054113c.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1801.03028v2" title="arxiv.org access"> <button class="ui compact blue labeled icon button serp-button"> <i class="file alternate outline icon"></i> arxiv.org </button> </a>

Flickering candle flames and their collective behavior

Attila Gergely, Bulcsú Sándor, Csaba Paizs, Robert Tötös, Zoltán Néda
<span title="2020-12-04">2020</span> <i title="Springer Science and Business Media LLC"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/tnqhc2x2aneavcd3gx5h7mswhm" style="color: black;">Scientific Reports</a> </i> &nbsp;
AbstractOscillation and collective behavior of diffusion flames is a fascinating phenomena. Considering candle bundles with different sizes in variable oxygen concentration, the flickering dynamics of the flames are experimentally and theoretically investigated. Trends for the flickering frequency as a function of the candle number in the bundle and oxygen concentration is revealed for various topologies of the candles packing. The collective behavior of the flames as a function of their
more &raquo; ... ion distance is studied by measuring an appropriate synchronization order parameter and through the common oscillation frequency. In agreement with previous results we find a discontinuous phase transition between an in-phase synchronized state at small separation distance and a counter-phase synchronized state at larger separation distances. A previously used dynamical model is modified in order to accommodate our experimental findings.
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1038/s41598-020-78229-x">doi:10.1038/s41598-020-78229-x</a> <a target="_blank" rel="external noopener" href="https://www.ncbi.nlm.nih.gov/pubmed/33277528">pmid:33277528</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/t575hyi5rjgvthl6gutvvqh2ke">fatcat:t575hyi5rjgvthl6gutvvqh2ke</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20210429094539/https://www.nature.com/articles/s41598-020-78229-x.pdf?error=cookies_not_supported&amp;code=f61a3bb6-8fbf-4e86-9c4a-4852f4762062" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/bd/26/bd2623b12a62bd6bc114079ac8de7cc5b5fc296a.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1038/s41598-020-78229-x"> <button class="ui left aligned compact blue labeled icon button serp-button"> <i class="unlock alternate icon" style="background-color: #fb971f;"></i> Publisher / doi.org </button> </a>

When the goal is to generate a series of activities: A self-organized simulated robot arm [article]

Tim Koglin, Bulcsú Sándor, Claudius Gros
<span title="2019-05-17">2019</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
Behavior is characterized by sequences of goal-oriented conducts, such as food uptake, socializing and resting. Classically, one would define for each task a corresponding satisfaction level, with the agent engaging, at a given time, in the activity having the lowest satisfaction level. Alternatively, one may consider that the agent follows the overarching objective to generate sequences of distinct activities. To achieve a balanced distribution of activities would then be the primary goal, and
more &raquo; ... not to master a specific task. In this setting, the agent would show two types of behaviors, task-oriented, and task-searching phases, with the latter interseeding the former. We study the emergence of autonomous task switching for the case of a simulated robot arm. Grasping one of several moving objects corresponds in this setting to a specific activity. Overall, the arm should follow a given object temporarily and then move away, in order to search for a new target and reengage. We show that this behavior can be generated robustly when modeling the arm as an adaptive dynamical system. The dissipation function is in this approach time dependent. The arm is in a dissipative state when searching for a nearby object, dissipating energy on approach. Once close, the dissipation function starts to increase, with the eventual sign change implying that the arm will take up energy and wander off. The resulting explorative state ends when the dissipation function becomes again negative and the arm selects a new target. We believe that our approach may be generalized to generate self-organized sequences of activities in general.
<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1905.07235v1">arXiv:1905.07235v1</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/a3os6rsnvbgt5lvv6udcq73u2e">fatcat:a3os6rsnvbgt5lvv6udcq73u2e</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20200912094335/https://arxiv.org/pdf/1905.07235v1.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/94/35/9435f31704e208616731a39df6ac78c4cfdbd39e.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1905.07235v1" title="arxiv.org access"> <button class="ui compact blue labeled icon button serp-button"> <i class="file alternate outline icon"></i> arxiv.org </button> </a>

Chaos on the conveyor belt

Bulcsú Sándor, Ferenc Járai-Szabó, Tamás Tél, Zoltán Néda
<span title="2013-04-23">2013</span> <i title="American Physical Society (APS)"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/nuk2stxzvvhf7ljciu325kj77m" style="color: black;">Physical Review E</a> </i> &nbsp;
The dynamics of a spring-block train placed on a moving conveyor belt is investigated both by simple experiments and computer simulations. The first block is connected by spring to an external static point, and due to the dragging effect of the belt the blocks undergo complex stick-slip dynamics. A qualitative agreement with the experimental results can only be achieved by taking into account the spatial inhomogeneity of the friction force on the belt's surface, modeled as noise. As a function
more &raquo; ... f the velocity of the conveyor belt and the noise strength, the system exhibits complex, self-organized critical, sometimes chaotic dynamics and phase transition-like behavior. Noise induced chaos and intermittency is also observed. Simulations suggest that the maximum complexity of the dynamical states is achieved for a relatively small number of blocks, around five.
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1103/physreve.87.042920">doi:10.1103/physreve.87.042920</a> <a target="_blank" rel="external noopener" href="https://www.ncbi.nlm.nih.gov/pubmed/23679502">pmid:23679502</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/rd5dcttihnfpve4owwoiko3ouq">fatcat:rd5dcttihnfpve4owwoiko3ouq</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20170808144520/http://theorphys.elte.hu/tel/pdf_pub/PRE871.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/6b/3f/6b3fc6baa2e8fcad8005cbe463d775cfe4b61895.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1103/physreve.87.042920"> <button class="ui left aligned compact blue labeled icon button serp-button"> <i class="external alternate icon"></i> aps.org </button> </a>

Chaos in time delay systems, an educational review [article]

Hendrik Wernecke, Bulcsú Sándor, Claudius Gros
<span title="2019-05-15">2019</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
The time needed to exchange information in the physical world induces a delay term when the respective system is modeled by differential equations. Time delays are hence ubiquitous, being furthermore likely to induce instabilities and with it various kinds of chaotic phases. Which are then the possible types of time delays, induced chaotic states, and methods suitable to characterize the resulting dynamics? This review presents an overview of the field that includes an in-depth discussion of
more &raquo; ... most important results, of the standard numerical approaches and of several novel tests for identifying chaos. Special emphasis is placed on a structured representation that is straightforward to follow. Several educational examples are included in addition as entry points to the rapidly developing field of time delay systems.
<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1901.04826v3">arXiv:1901.04826v3</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/fwfyma6tsfcjncnhsjjqgbvu3e">fatcat:fwfyma6tsfcjncnhsjjqgbvu3e</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20200905210733/https://arxiv.org/pdf/1901.04826v3.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/46/d6/46d6cebf4afeb071a888990c003a473f15273df7.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1901.04826v3" title="arxiv.org access"> <button class="ui compact blue labeled icon button serp-button"> <i class="file alternate outline icon"></i> arxiv.org </button> </a>

Spring-block model for a single-lane highway traffic

Ferenc Járai-Szabó, Bulcsú Sándor, Zoltán Néda
<span title="2011-01-01">2011</span> <i title="Walter de Gruyter GmbH"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/r4ecuox7yrdy7h75vf7dx5nbau" style="color: black;">Open Physics</a> </i> &nbsp;
Ferenc Járai-Szabó, Bulcsú Sándor, Zoltán Néda  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.2478/s11534-011-0007-6">doi:10.2478/s11534-011-0007-6</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/dyaqok7fbrbz5mz5lgr6ij62ae">fatcat:dyaqok7fbrbz5mz5lgr6ij62ae</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20180728001100/https://www.degruyter.com/downloadpdf/j/phys.2011.9.issue-4/s11534-011-0007-6/s11534-011-0007-6.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/fd/e2/fde28a8e3f36aa9835b1cb70b28c4aad78a2ea48.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.2478/s11534-011-0007-6"> <button class="ui left aligned compact blue labeled icon button serp-button"> <i class="unlock alternate icon" style="background-color: #fb971f;"></i> Publisher / doi.org </button> </a>

A Novel Measure Inspired by Lyapunov Exponents for the Characterization of Dynamics in State-Transition Networks

Bulcsú Sándor, Bence Schneider, Zsolt I. Lázár, Mária Ercsey-Ravasz
<span title="2021-01-12">2021</span> <i title="MDPI AG"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/4d3elkqvznfzho6ki7a35bt47u" style="color: black;">Entropy</a> </i> &nbsp;
(Bulcsú Sándor) and Z.I.L.; investigation, B.S. (Bulcsú Sándor), Z.I.L. and B.S. (Bence Schneider); writing-original draft preparation, B.S. (Bulcsú Sándor), Z.I.L. and M.E.  ...  (Bulcsú Sándor), Z.I.L. and M.E.-R.; methodology, B.S. (Bulcsú Sándor), Z.I.L. and M.E.-R.; software, B.S. (Bulcsú Sándor), Z.I.L. and B.S. (Bence Schneider); formal analysis, B.S.  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.3390/e23010103">doi:10.3390/e23010103</a> <a target="_blank" rel="external noopener" href="https://www.ncbi.nlm.nih.gov/pubmed/33445685">pmid:33445685</a> <a target="_blank" rel="external noopener" href="https://pubmed.ncbi.nlm.nih.gov/PMC7828116/">pmcid:PMC7828116</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/72o4ad6o2bekfjqkfdsicuyqqm">fatcat:72o4ad6o2bekfjqkfdsicuyqqm</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20210115191546/https://res.mdpi.com/d_attachment/entropy/entropy-23-00103/article_deploy/entropy-23-00103-v2.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/ae/77/ae7700d6b4cab96e5d8ac6313c67f1c7e525462e.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.3390/e23010103"> <button class="ui left aligned compact blue labeled icon button serp-button"> <i class="unlock alternate icon" style="background-color: #fb971f;"></i> mdpi.com </button> </a> <a target="_blank" rel="external noopener" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7828116" title="pubmed link"> <button class="ui compact blue labeled icon button serp-button"> <i class="file alternate outline icon"></i> pubmed.gov </button> </a>

A spring–block analogy for the dynamics of stock indexes

Bulcsú Sándor, Zoltán Néda
<span title="">2015</span> <i title="Elsevier BV"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/dlb6tmf5cve7dphk62d6tkyuvy" style="color: black;">Physica A: Statistical Mechanics and its Applications</a> </i> &nbsp;
A spring-block chain placed on a running conveyor belt is considered for modeling stylized facts observed in the dynamics of stock indexes. Individual stocks are modeled by the blocks, while the stock-stock correlations are introduced via simple elastic forces acting in the springs. The dragging effect of the moving belt corresponds to the expected economic growth. The spring-block system produces collective behavior and avalanche like phenomena, similar to the ones observed in stock markets.
more &raquo; ... artificial index is defined for the spring-block chain, and its dynamics is compared with the one measured for the Dow Jones Industrial Average. For certain parameter regions the model reproduces qualitatively well the dynamics of the logarithmic index, the logarithmic returns, the distribution of the logarithmic returns, the avalanche-size distribution and the distribution of the investment horizons. A noticeable success of the model is that it is able to account for the gain-loss asymmetry observed in the inverse statistics. Our approach has mainly a pedagogical value, bridging between a complex socio-economic phenomena and a basic (mechanical) model in physics.
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1016/j.physa.2015.01.079">doi:10.1016/j.physa.2015.01.079</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/y4c4qgvkkjfknozqyqq4sab3cq">fatcat:y4c4qgvkkjfknozqyqq4sab3cq</a> </span>
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A self-organized one-neuron controller for artificial life on wheels

Claudius Gros, Laura Martin, Bulcsú Sándor
<span title="">2017</span> <i title="MIT Press"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/3a3rcmfryvdyviiewtmf62khs4" style="color: black;">Proceedings of the 14th European Conference on Artificial Life ECAL 2017</a> </i> &nbsp;
Compliant control is achieved here through the emergence of self-organized attractors in sensorimotorloop (Sándor et al., 2015) .  ...  ., 2016) , i. e. in the combined phase space of neuronal controller and the dynamics of the body and of the environment (Sándor et al., 2015) . • We find that a single neuron per joint is sufficient for  ... 
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When the goal is to generate a series of activities: A self-organized simulated robot arm

Tim Koglin, Bulcsú Sándor, Claudius Gros, Dante R. Chialvo
<span title="2019-06-19">2019</span> <i title="Public Library of Science (PLoS)"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/s3gm7274mfe6fcs7e3jterqlri" style="color: black;">PLoS ONE</a> </i> &nbsp;
Supporting information Author Contributions Conceptualization: Bulcsú Sándor, Claudius Gros. • Polar representation of the velocity (M-PV).  ... 
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A versatile class of prototype dynamical systems for complex bifurcation cascades of limit cycles

Bulcsú Sándor, Claudius Gros
<span title="2015-07-22">2015</span> <i title="Springer Nature"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/tnqhc2x2aneavcd3gx5h7mswhm" style="color: black;">Scientific Reports</a> </i> &nbsp;
We introduce a versatile class of prototype dynamical systems for the study of complex bifurcation cascades of limit cycles, including bifurcations breaking spontaneously a symmetry of the system, period doubling bifurcations and transitions to chaos induced by sequences of limit cycle bifurcations. The prototype system consist of a 2d-dimensional dynamical system with friction forces f(V(x)) functionally dependent exclusively on the mechanical potential V(x), which is typically characterized,
more &raquo; ... ere, by a finite number of local minima. We present examples for d=1,2 and simple polynomial friction forces f(V), where the zeros of f(V) regulate the relative importance of energy uptake and dissipation respectively, serving as bifurcation parameters. Starting from simple Hopf- and homoclinic bifurcations, complex sequences of limit cycle bifurcation are observed when energy uptake gains progressively in importance.
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