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Search Results: 1 - 10 of 190414 matches for " Géza Makay "
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Invariance groups of finite functions and orbit equivalence of permutation groups
Eszter K. Horváth,Géza Makay,Reinhard P?schel,Tamás Waldhauser
Mathematics , 2012,
Abstract: Which subgroups of the symmetric group S_n arise as invariance groups of n-variable functions defined on a k-element domain? It appears that the higher the difference n-k, the more difficult it is to answer this question. For k>=n, the answer is easy: all subgroups of S_n are invariance groups. We give a complete answer in the cases k=n-1 and k=n-2, and we also give a partial answer in the general case: we describe invariance groups when n is much larger than n-k. The proof utilizes Galois connections and the corresponding closure operators on S_n, which turn out to provide a generalization of orbit equivalence of permutation groups. We also present some computational results, which show that all primitive groups except for the alternating groups arise as invariance groups of functions defined on a three-element domain.
Critical behavior in reaction-diffusion systems exhibiting absorbing phase transitions
ódor, Géza;
Brazilian Journal of Physics , 2003, DOI: 10.1590/S0103-97332003000300003
Abstract: phase transitions of reaction-diffusion systems with a site occupation restriction, particle creation requiring n > 2 parents, and in which explicit diffusion of single particles (a) is possible, are reviewed. arguments based on mean-field approximation and simulations are given which support novel kind of nonequilibrium criticality. these are in contradiction with the implications of a suggested phenomenological, multiplicative noise langevin equation approach and with some recent numerical analyses. simulation results for one- and two-dimensional binary spreading model, 2a ? 4a, 4a ? 2a, reveal a new type of mean-field criticality characterized by the critical exponents a = 1/3 and b = 1/2, as suggested in a recent preprint [cond-mat/0210615]
Peer bullying in schools
R?za G?kler
International Journal of Human Sciences , 2009,
Abstract: In this study, the term of "Peer Bullying" has been observed according to definitions and approaches variety in Turkey and abroad. "Bullying" is used synonym of violence and aggressiveness today and spread of all cultures in the world as an international concept. "Bullying" is a widespread fact which consists of physical, verbal and social damage to a feeble one. It is a kind of violence and can be defined as incapability of someone to a person or more than one person's violence. Bullying can be classified as follows: psychological and emotional (a gossip or exclusion etc.), verbal (get a nickname, impose constraints, intimidation etc.) and physical (impellent, to kick a victim etc.)The findings of this study can be summarized as follows: the frequency and extent of violence is very effective on espousal, insensitivity and unresponsiveness of the students. Thus, they use them as a problem solving instrument and also can move them to all parts of theri life. Bully has been determined that some precautions should be taken not to be effected from the short term and long term effects of violence.
EXAMINATIONS ON THE AIR QUALITY IN BEREHOVE (UKRAINE) BETWEEN 1997 AND 2007
GéZA PAPP
Acta Geographica Debrecina. Landscape and Environment Series , 2008,
Abstract: First results of the examinations on the air quality in Beregszász (Ukraine) are presented in the present paper. Data sets of air quality monitoring network in Beregszász were provided by the Beregszász township office of National Health Service of Ukraine. Monitoring network consists of five stations in the industrial residential and recreational districts of the town. Measurements were carried out between 1995 and 2007 in the heating and in the non heating seasons. Spatial and seasonal distributions of SO2, NO2 and particulate matter were analyzed using the Student t-test.
DEVELOPING LEAN PRODUCTION STEP BY STEP
HUSI Géza
Debreceni M?szaki K?zlemények , 2007,
Abstract: As with most other production philosophies and management practices, lean principles cannot be universally applied. However, because they are fundamentally customer value driven, they are suitable for many manufacturing environments. There are five basic principles of lean manufacturing: understanding customer, value stream analysis, flow, pull, perfection. These five lean principles work together and are fundamental to the elimination of waste. This paper illustrates how I supports the first steps of lean principles in a factory, using a simple Value Stream Mapping symbols. Value Stream Mapping (VSM) is a visualization tool oriented to the Toyota version of Lean Manufacturing (Toyota Production System). It helps to understand and streamline work processes using the tools and techniques of Lean Manufacturing.
Slow dynamics of the contact process on complex networks
ódor Géza
EPJ Web of Conferences , 2013, DOI: 10.1051/epjconf/20134404005
Abstract: The Contact Process has been studied on complex networks exhibiting different kinds of quenched disorder. Numerical evidence is found for Griffiths phases and other rare region effects, in Erd s Rényi networks, leading rather generically to anomalously slow (algebraic, logarithmic,…) relaxation. More surprisingly, it turns out that Griffiths phases can also emerge in the absence of quenched disorder, as a consequence of sole topological heterogeneity in networks with finite topological dimension. In case of scalefree networks, exhibiting infinite topological dimension, slow dynamics can be observed on tree-like structures and a superimposed weight pattern. In the infinite size limit the correlated subspaces of vertices seem to cause a smeared phase transition. These results have a broad spectrum of implications for propagation phenomena and other dynamical process on networks and are relevant for the analysis of both models and empirical data.
Critical behavior in reaction-diffusion systems exhibiting absorbing phase transitions
ódor Géza
Brazilian Journal of Physics , 2003,
Abstract: Phase transitions of reaction-diffusion systems with a site occupation restriction, particle creation requiring n > 2 parents, and in which explicit diffusion of single particles (A) is possible, are reviewed. Arguments based on mean-field approximation and simulations are given which support novel kind of nonequilibrium criticality. These are in contradiction with the implications of a suggested phenomenological, multiplicative noise Langevin equation approach and with some recent numerical analyses. Simulation results for one- and two-dimensional binary spreading model, 2A -> 4A, 4A -> 2A, reveal a new type of mean-field criticality characterized by the critical exponents a = 1/3 and b = 1/2, as suggested in a recent preprint [cond-mat/0210615]
Crossover of a nonequilibrium system studied by coherent anomaly method
Géza ódor
Physics , 1995,
Abstract: In the stochastic cellular automaton of rule 18 defined by S. Wolfram [Rev.\ Mod.\ Phys.\ {\bf 55}, 601 (1983)] the crossover of the critical behaviour induced by nonlocal site exchange was investigated using the coherent anomaly method. The continuous variation of the critical $\beta$ exponent was confirmed.
Slow, bursty dynamics as the consequence of quenched network topologies
Géza ódor
Physics , 2014, DOI: 10.1103/PhysRevE.89.042102
Abstract: Bursty dynamics of agents is shown to appear at criticality or in extended Griffiths phases, even in case of Poisson processes. I provide numerical evidence for power-law type of inter-communication time distributions by simulating the Contact Process and the Susceptible-Infected-Susceptible model. This observation suggests that in case of non-stationary bursty systems the observed non-poissonian behavior can emerge as the consequence of an underlying hidden poissonian network process, which is either critical or exhibits strong rare-region effects. On contrary, in time varying networks rare-region effects do not cause deviation from the mean-field behavior and heterogeneity induced burstyness is absent.
Localization transition, Lifschitz tails and rare-region effects in network models
Géza ódor
Physics , 2014, DOI: 10.1103/PhysRevE.90.032110
Abstract: Effects of heterogeneity in the suspected-infected-susceptible model on networks are investigated using quenched mean-field theory. The emergence of localization is described by the distributions of the inverse participation ratio and compared with the rare-region effects appearing in simulations and in the Lifschitz tails. The latter, in the linear approximation, is related to the spectral density of the Laplacian matrix and to the time dependent order parameter. I show that these approximations indicate correctly Griffiths Phases both on regular one-dimensional lattices and on small world networks exhibiting purely topological disorder. I discuss the localization transition that occurs on scale-free networks at $\gamma=3$ degree exponent.
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