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Search Results: 1 - 10 of 190381 matches for " Géza Kogler "
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A portable powered ankle-foot orthosis for rehabilitation
K. Alex Shorter, PhD,Géza F. Kogler, PhD, CO,Eric Loth, PhD,William K. Durfee, PhD
Journal of Rehabilitation Research and Development , 2011,
Abstract: Innovative technological advancements in the field of orthotics, such as portable powered orthotic systems, could create new treatment modalities to improve the functional outcome of rehabilitation. In this article, we present a novel portablepowered ankle-foot orthosis (PPAFO) to provide untethered assistance during gait. The PPAFO provides both plantar flexor and dorsiflexor torque assistance by way of a bidirectional pneumatic rotary actuator. The system uses a portable pneumatic power source (compressed carbon dioxide bottle) and embedded electronics to control the actuation of the foot. We collected pilot experimental data from one impaired and three nondisabled subjects to demonstrate design functionality. The impaired subject had bilateral impairment of the lower legs due to cauda equina syndrome. We found that data from nondisabledwalkers demonstrated the PPAFO’s capability to provide correctlytimed plantar flexor and dorsiflexor assistance during gait. Reduced activation of the tibialis anterior during stance and swing was also seen during assisted nondisabled walking trials. An increase in the vertical ground reaction force during the second half of stance was present during assisted trials for the impaired subject. Data from nondisabled walkers demonstrated functionality, and data from an impaired walker demonstrated the ability to provide functional plantar flexor assistance.
A pneumatic power harvesting ankle-foot orthosis to prevent foot-drop
Robin Chin, Elizabeth T Hsiao-Wecksler, Eric Loth, Géza Kogler, Scott D Manwaring, Serena N Tyson, K Alex Shorter, Joel N Gilmer
Journal of NeuroEngineering and Rehabilitation , 2009, DOI: 10.1186/1743-0003-6-19
Abstract: The PhAFO was constructed from a two-part (tibia and foot) carbon composite structure with an articulating ankle joint. Ankle motion control was accomplished through a cam-follower locking mechanism actuated via a pneumatic circuit connected to the bellow pump and embedded in the foam sole. Biomechanical performance of the prototype orthosis was assessed during multiple trials of treadmill walking of an able-bodied control subject (n = 1). Motion capture and pressure measurements were used to investigate the effect of the PhAFO on lower limb joint behavior and the capacity of the bellow pump to repeatedly generate the required pneumatic pressure for toe clearance.Toe clearance during swing was successfully achieved during all trials; average clearance 44 ± 5 mm. Free ankle motion was observed during stance and plantarflexion was blocked during swing. In addition, the bellow component repeatedly generated an average of 169 kPa per step of pressure during ten minutes of walking.This study demonstrated that fluid power could be harvested with a pneumatic circuit built into an AFO, and used to operate an actuated cam-lock mechanism that controls ankle-foot motion at specific periods of the gait cycle.Foot-drop is a condition where the foot does not effectively clear the ground due to weak or absent ankle dorsiflexors which results in a steppage-type gait pattern. Steppage gait is a compensatory walking pattern for foot-drop that is characterized by increased knee and hip flexion during the swing phase to insure that the toe clears the ground during walking. The cause of foot-drop can be neurological and/or muscular in origin due to a multitude of pathologies [1]. A common treatment intervention is the use of an ankle-foot orthosis (AFO) that supports the ankle and foot to preclude foot-drop. This study presents a novel self-contained power harvesting ankle-foot orthosis that controls the unwanted plantarflexion movements associated with foot-drop and permits free ankle
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.
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