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Search Results: 1 - 10 of 335957 matches for " András Zsolt "
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Efficient Sparse Coding in Early Sensory Processing: Lessons from Signal Recovery
András L?rincz ,Zsolt Palotai,Gábor Szirtes
PLOS Computational Biology , 2012, DOI: 10.1371/journal.pcbi.1002372
Abstract: Sensory representations are not only sparse, but often overcomplete: coding units significantly outnumber the input units. For models of neural coding this overcompleteness poses a computational challenge for shaping the signal processing channels as well as for using the large and sparse representations in an efficient way. We argue that higher level overcompleteness becomes computationally tractable by imposing sparsity on synaptic activity and we also show that such structural sparsity can be facilitated by statistics based decomposition of the stimuli into typical and atypical parts prior to sparse coding. Typical parts represent large-scale correlations, thus they can be significantly compressed. Atypical parts, on the other hand, represent local features and are the subjects of actual sparse coding. When applied on natural images, our decomposition based sparse coding model can efficiently form overcomplete codes and both center-surround and oriented filters are obtained similar to those observed in the retina and the primary visual cortex, respectively. Therefore we hypothesize that the proposed computational architecture can be seen as a coherent functional model of the first stages of sensory coding in early vision.
Effect of Alternative Housing on Carcass Traits of Rabbits
Szilvia Metzger,Károly Kustos,Zsolt Szendr?,András Szabó
Agriculturae Conspectus Scientificus (ACS) , 2003,
Abstract: One hundred and sixty one New Zealand White weaned rabbits were housed in cages (0.4x0.4 m, 3 rabbits/cage, 18.7 rabbits/m2) or in a pen on deep litter (3x3.3 m, 0.2 m thick wheat straw litter, 80 rabbits/pen, 8.1 rabbits/m2). At 13 weeks of age pen-housed rabbits (n=52) had lower body weight (2318 vs. 2437 g; P<0,01) and dressing out percentage (59.8 vs. 61.0 %; P<0,01) than the cage-housed animals (n=68). Higher proportion of the fore (32.3 vs. 31.4 %; P<0,01) and the hind part of the carcass (40.3 vs. 37.9 %; P<0.001) were found in pen-housed group compared to cage-housed rabbits. While the proportion of the intermediate part (27.5 vs. 30.7 %; P<0,001) was lower in pen-housed animals. The ratio of perirenal fat to pre-slaughter body weight was lower in pen-housed rabbits (0.45 vs. 0.83 % P<0.001) than in cagehoused group.
B?LCSKEI, Attila,KOVáCS, András Zsolt
Debreceni M?szaki K?zlemények , 2012,
Abstract: In this paper we present some results of a survey that aimed to examine the development of spatial abilities of architect students at Ybl Miklós Faculty of Architecture and Civil Engineering. The survey was carried out by the world-wide Mental Cutting Test (shortly MCT). Among others, we examined the impact of the studies of the discipline Descriptive Geometry on MCT test results; analized as the effect of some recorded factors, as the distribution in different subject groups and found signs of considerable differences between genders. During data processing we used statistical methods, the conclusions extracted from data evaluation were submitted to hypothesis testing. We also try to explain the observations.
Phase statistics of the WMAP 7 year data
András Kovács,István Szapudi,Zsolt Frei
Physics , 2013, DOI: 10.1002/asna.201211985
Abstract: We performed a comprehensive statistical analysis using complex phases of the a_lm coefficients computed from the most recent data of the Wilkinson Microwave Anisotropy Probe (WMAP). Our aim was to confirm or constrain the presence of non-Gaussianities in the data. We found phase correlations - that suggest non-Gaussianity - at high-l in a_lm coefficients by applying various statistical tests. Most of all, we detected a non-Gaussian signal reaching a significance of 4.7 sigma using random walk statistics and simulations. However, our conclusion is that the non-Gaussian behavior is due to contamination from galactic foregrounds that show up in small scales only. When masked out the contaminated regions, we found no significant non-Gaussianity. Furthermore, we constrained the f_NL parameter using CMB simulations that mimic primordial non-Gaussianity. Our estimate is f_NL=40 +/- 200, in agreement with previous measurements and inflationary expectations.
Sparse and silent coding in neural circuits
András L\Horincz,Zsolt Palotai,Gábor Szirtes
Computer Science , 2010,
Abstract: Sparse coding algorithms are about finding a linear basis in which signals can be represented by a small number of active (non-zero) coefficients. Such coding has many applications in science and engineering and is believed to play an important role in neural information processing. However, due to the computational complexity of the task, only approximate solutions provide the required efficiency (in terms of time). As new results show, under particular conditions there exist efficient solutions by minimizing the magnitude of the coefficients (`$l_1$-norm') instead of minimizing the size of the active subset of features (`$l_0$-norm'). Straightforward neural implementation of these solutions is not likely, as they require \emph{a priori} knowledge of the number of active features. Furthermore, these methods utilize iterative re-evaluation of the reconstruction error, which in turn implies that final sparse forms (featuring `population sparseness') can only be reached through the formation of a series of non-sparse representations, which is in contrast with the overall sparse functioning of the neural systems (`lifetime sparseness'). In this article we present a novel algorithm which integrates our previous `$l_0$-norm' model on spike based probabilistic optimization for sparse coding with ideas coming from novel `$l_1$-norm' solutions. The resulting algorithm allows neurally plausible implementation and does not require an exactly defined sparseness level thus it is suitable for representing natural stimuli with a varying number of features. We also demonstrate that the combined method significantly extends the domain where optimal solutions can be found by `$l_1$-norm' based algorithms.
Pneumatic vehicle. Research and design
Feigi András-Alfréd,Lokodi Zsolt,Balazsi Arnold,árgyo András-Botond
Scientific Bulletin of the ''Petru Maior" University of T?rgu Mure? , 2011,
Abstract: This experimental vehicle was designed for an international competition organized by Bosch Rexroth yearly in Hungary. The purpose of this competition is to design, build and race vehicles with a fuel source of compressed gas. The race consists of multiple events: longest run distance, the smartness track and the best acceleration event. These events test to the limit the capabilities of the designed vehicles.
András Lévai,Gábor Milisits,Zsolt Szendr?,István Radnai
Poljoprivreda (Osijek) , 2000,
Abstract: The aim of this study was to clarify the effect of body fat content on some reproductive traits of Pannon White rabbit does. For this purpose rabbits of average 1 S.D. live weight at 10 weeks and of average 1 S.D. daily weight gain between 6 and 10 weeks of age were chosen from the experimental stock of the university, and their fat content was determined with an EM-SCAN SA-3152 type Small Animal Body Composition Analyser (by means of the TOBEC method). Based on the fat content determined the best and worst 16% of the does and the best and worst 8% of the bucks were chosen and mated with each other (fatty doe with fatty buck and lean doe with lean buck). It was found that the conception rate was significantly higher (71.4% vs. 43.7%) and the time between two kindlings significantly lower (56 vs. 67 days) in the case of fatty rabbits. No differences were observed in litter size (8.3 vs. 8.3) or litter weight at birth (437g vs. 450g), but mortality among the suckling rabbits was significantly lower (16.7% vs. 28.3%) in the case of fatty rabbits.
Brief Description of the Survival Analysis Procedure Using the Running Rejection Behaviour of Young Rabbits as a Model Trait
István Nagy,András Szabó,Róbert Romvári,Zsolt Szendr?
Agriculturae Conspectus Scientificus (ACS) , 2004,
Abstract: The application possibilities of certain parametric and nonparametric methods concerning survival analysis were investigated on 18 Pannon White rabbits of a physiological trial. The running rejection behaviour was used as an accurate model trait for the above mentioned analysis. Rabbits had to run on a motor-driven treadmill until exhaustion twice every day. The duration of the experiment was set to be 24 days and the rabbits were arbitrarily sorted into two groups (above and below the median of the end weight of the experiment) labeled as large and small, respectively. The pattern of the results was very similar regardless of the applied method (Kaplan Meier survival curves, Cox PH model, Weibull distribution). Higher inclination towards the running rejection with the increasing weight of the rabbits seemed to be undeniable. Yet probably due to the small sample size it was impossible to obtain significant differences between the groups. Nevertheless, the appropriateness of survival analysis was clearly demonstrated in the present study and its application can strongly be recommended in order to analyze similar (i.e. time to event) data.
Extreme Procalcitonin Elevation without Proven Bacterial Infection Related to Amphetamine Abuse
András Lovas,Zsuzsanna ágoston,Klára Késmárky,Péter Hankovszky,Zsolt Molnár
Case Reports in Critical Care , 2014, DOI: 10.1155/2014/179313
Abstract: Systemic inflammatory response with rhabdomyolysis and consequent multiorgan failure is a known sequela of psychotropic drug abuse. However, in cases with uncertain past medical history the initial diagnosis can be challenging. Here we report the case of a 21-year-old male who was admitted to the intensive care unit with severe neurological impairment caused by amphetamine intoxication. First laboratory investigations revealed extremely high serum procalcitonin (PCT) levels reaching a maximum concentration of 1640?ng/mL on the second day of observation. Although PCT has high sensitivity and specificity in differentiating bacterial sepsis from nonbacterial inflammation, our case report shows for the first time that it can be extremely elevated following serious amphetamine intoxication without bacterial infection. 1. Introduction Procalcitonin (PCT) is a well-known biomarker for the diagnosis of sepsis. Although its absolute value and its kinetics over time have high sensitivity and specificity for differentiating bacterial infection from systemic inflammation in the critically ill [1, 2] but it is also important to interpret the results of the first measurement in the context of the full medical picture. One has to take into account that one cut-off value for PCT cannot be applied in all circumstances. Indeed, “elevated” PCT levels were described in surgical and trauma patients without proven infection but this increment was generated by the systemic inflammatory response syndrome (SIRS) in answer to the injurious insult [3, 4]. Severe SIRS can also be present in various medical conditions including amphetamine overdose [5]. We report the case of an extreme elevation of PCT without bacterial sepsis in a young man who presented with altered level of consciousness due to amphetamine intoxication which was initially thought to be infectious meningitis. 2. Case Report The 21-year-old male was found unconscious by his parents at home. The attending ambulance crew measured severe hypoglycaemia. After the serum glucose level was normalised by iv. glucose infusion the patient was transferred to the Accident and Emergency Department with oxygen supplementation via a face mask. Regarding his medical history he was fit and well, not on any regular medication. On the first assessment he was tachypnoeic (30/min) and had a SpO2 of 98%, sinus tachycardia (135/min), and a blood pressure of 96/67?mmHg. His neurological examination showed a Glasgow Coma Scale of 9 with no meningeal signs, dilated, equal pupils reacting for light, bulbs fixed to the left, and right sided
Cross-correlation of WMAP7 and the WISE Full Data Release
András Kovács,István Szapudi,Benjamin R. Granett,Zsolt Frei
Physics , 2013, DOI: 10.1093/mnrasl/slt002
Abstract: We measured the cross-correlation of the Wilkinson Microwave Anisotropy Probe (WMAP) 7 year temperature map and the full sky data release of the Wide-field Infrared Survey Explorer (WISE) galaxy map. Using careful mapmaking and masking techniques we find a positive cross-correlation signal. The results are fully consistent with a Lambda-CDM Universe, although not statistically significant. Our findings are robust against changing the galactic latitude cut from |b|>10 to |b|>20 and no color dependence was detected when we used WMAP Q, V or W maps. We confirm higher significance correlations found in the preliminary data release. The change in significance is consistent with cosmic variance.
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