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Search Results: 1 - 10 of 167598 matches for " E. Pantic "
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Studies of a three-stage dark matter and neutrino observatory based on multi-ton combinations of liquid xenon and liquid argon detectors
K. Arisaka,P. Beltrame,C. W. Lam,P. F. Smith,C. Ghag,D. B. Cline,K. Lung,Y. Meng,E. Pantic,P. R. Scovell,A. Teymourian,H. Wang
Physics , 2011, DOI: 10.1016/j.astropartphys.2012.05.006
Abstract: We study a three stage dark matter and neutrino observatory based on multi-ton two-phase liquid Xe and Ar detectors with sufficiently low backgrounds to be sensitive to WIMP dark matter interaction cross sections down to 10E-47 cm^2, and to provide both identification and two independent measurements of the WIMP mass through the use of the two target elements in a 5:1 mass ratio, giving an expected similarity of event numbers. The same detection systems will also allow measurement of the pp solar neutrino spectrum, the neutrino flux and temperature from a Galactic supernova, and neutrinoless double beta decay of 136Xe to the lifetime level of 10E27 - 10E28 y corresponding to the Majorana mass predicted from current neutrino oscillation data. The proposed scheme would be operated in three stages G2, G3, G4, beginning with fiducial masses 1-ton Xe + 5-ton Ar (G2), progressing to 10-ton Xe + 50-ton Ar (G3) then, dependent on results and performance of the latter, expandable to 100-ton Xe + 500-ton Ar (G4). This method of scale-up offers the advantage of utilizing the Ar vessel and ancillary systems of one stage for the Xe detector of the succeeding stage, requiring only one new detector vessel at each stage. Simulations show the feasibility of reducing or rejecting all external and internal background levels to a level <1 events per year for each succeeding mass level, by utilizing an increasing outer thickness of target material as self-shielding. The system would, with increasing mass scale, become increasingly sensitive to annual signal modulation, the agreement of Xe and Ar results confirming the Galactic origin of the signal. Dark matter sensitivities for spin-dependent and inelastic interactions are also included, and we conclude with a discussion of possible further gains from the use of Xe/Ar mixtures.
THE USE OF FUZZY THEORY IN GRADING OF STUDENTS IN MATH
Momcilo BJELICA,Dragica RANKOVIC,Misa Pantic
The Turkish Online Journal of Distance Education , 2010,
Abstract: The development of computer science, statistics and other technological fields, give us more opportunities to improve the process of evaluation of degree of knowledge and achievements in a learning process of our students. More and more we are relying on the computer software to guide us in the grading process. An improved way of grading can help overcome some limitations of the educational process, that have caused problems, and had as a consequence a lower degree of success. With the combination of old, traditional way of evaluation of students knowledge and success, and the application of “fuzzy logic” and “the theory of fuzzy sets”, “the method of ponderous areas”, and other new computer and scientific technologies, we are getting a complex formula , that is also, friendly to constant changes, depending on developments in the schooling process. The new grading system is very user friendly, and can be applied in primary-middle schools as well as in high schools. It takes into account all the students activities and achievements, raises the quality of a teacher’s performance and can be updated with new computer technologies. This model is, also, a great support program in grading of students involved in “distance learning“systems.
Anthropocentric Video Analysis: Tools and Applications
Nikos Nikolaidis,Maja Pantic,Ioannis Pitas
EURASIP Journal on Image and Video Processing , 2008, DOI: 10.1155/2008/676094
Abstract:
Anthropocentric Video Analysis: Tools and Applications
Nikolaidis Nikos,Pantic Maja,Pitas Ioannis
EURASIP Journal on Image and Video Processing , 2008,
Abstract:
A Unified Framework for Probabilistic Component Analysis
Mihalis A. Nicolaou,Stefanos Zafeiriou,Maja Pantic
Computer Science , 2013,
Abstract: We present a unifying framework which reduces the construction of probabilistic component analysis techniques to a mere selection of the latent neighbourhood, thus providing an elegant and principled framework for creating novel component analysis models as well as constructing probabilistic equivalents of deterministic component analysis methods. Under our framework, we unify many very popular and well-studied component analysis algorithms, such as Principal Component Analysis (PCA), Linear Discriminant Analysis (LDA), Locality Preserving Projections (LPP) and Slow Feature Analysis (SFA), some of which have no probabilistic equivalents in literature thus far. We firstly define the Markov Random Fields (MRFs) which encapsulate the latent connectivity of the aforementioned component analysis techniques; subsequently, we show that the projection directions produced by all PCA, LDA, LPP and SFA are also produced by the Maximum Likelihood (ML) solution of a single joint probability density function, composed by selecting one of the defined MRF priors while utilising a simple observation model. Furthermore, we propose novel Expectation Maximization (EM) algorithms, exploiting the proposed joint PDF, while we generalize the proposed methodologies to arbitrary connectivities via parameterizable MRF products. Theoretical analysis and experiments on both simulated and real world data show the usefulness of the proposed framework, by deriving methods which well outperform state-of-the-art equivalents.
Heteroscedastic Conditional Ordinal Random Fields for Pain Intensity Estimation from Facial Images
Ognjen Rudovic,Maja Pantic,Vladimir Pavlovic
Computer Science , 2013,
Abstract: We propose a novel method for automatic pain intensity estimation from facial images based on the framework of kernel Conditional Ordinal Random Fields (KCORF). We extend this framework to account for heteroscedasticity on the output labels(i.e., pain intensity scores) and introduce a novel dynamic features, dynamic ranks, that impose temporal ordinal constraints on the static ranks (i.e., intensity scores). Our experimental results show that the proposed approach outperforms state-of-the art methods for sequence classification with ordinal data and other ordinal regression models. The approach performs significantly better than other models in terms of Intra-Class Correlation measure, which is the most accepted evaluation measure in the tasks of facial behaviour intensity estimation.
Characterization of the QUartz Photon Intensifying Detector (QUPID) for Noble Liquid Detectors
A. Teymourian,D. Aharoni,L. Baudis,P. Beltrame,E. Brown,D. Cline,A. D. Ferella,A. Fukasawa,C. W. Lam,T. Lim,K. Lung,Y. Meng,S. Muramatsu,E. Pantic,M. Suyama,H. Wang,K. Arisaka
Physics , 2011, DOI: 10.1016/j.nima.2011.07.015
Abstract: Dark Matter and Double Beta Decay experiments require extremely low radioactivity within the detector materials. For this purpose, the University of California, Los Angeles and Hamamatsu Photonics have developed the QUartz Photon Intensifying Detector (QUPID), an ultra-low background photodetector based on the Hybrid Avalanche Photo Diode (HAPD) and entirely made of ultraclean synthetic fused silica. In this work we present the basic concept of the QUPID and the testing measurements on QUPIDs from the first production line. Screening of radioactivity at the Gator facility in the Laboratori Nazionali del Gran Sasso has shown that the QUPIDs safely fulfill the low radioactive contamination requirements for the next generation zero background experiments set by Monte Carlo simulations. The quantum efficiency of the QUPID at room temperature is > 30% at the xenon scintillation wavelength. At low temperatures, the QUPID shows a leakage current less than 1 nA and a global gain of 10^5. In these conditions, the photocathode and the anode show > 95% linearity up to 1 uA for the cathode and 3 mA for the anode. The photocathode and collection efficiency are uniform to 80% over the entire surface. In parallel with single photon counting capabilities, the QUPIDs have a good timing response: 1.8 +/- 0.1 ns rise time, 2.5 +/- 0.2 ns fall time, 4.20 +/- 0.05 ns pulse width, and 160 +/- 30 ps transit time spread. The QUPIDs have also been tested in a liquid xenon environment, and scintillation light from 57Co and 210Po radioactive sources were observed.
Screen viewing, body mass index, cigarette smoking and sleep duration in Belgrade University student population: results of an observational, cross-sectional study
Pantic,Igor; Malbasa,Milica; Ristic,Sinisa; Turjacanin,Drenka; Medenica,Snezana; Paunovic,Jovana; Pantic,Senka;
Revista médica de Chile , 2011, DOI: 10.4067/S0034-98872011000700010
Abstract: background: subjects that spend more time working on computers or watching television could have a higher body mass index. aim: to assess the relationship between time spent in front of a screen and studying, body mass index (bmi), smoking, and sleep duration among university students. material and methods: a cross-sectional study of 734 randomly selected students aged 21 ±2 years (450 females) that responded an anonymous, structured questionnaire about time spent watching television or in front of a computer, time spent studying, number of daily hours of sleep, smoking habits and number of daily meals. body mass index was also calculated for all subjects results: among males, the number of daily sleep hours, time spent working with computers and number of daily meals were significantly higher and time spent studying was significantly lower than females. nonsmokers ate a significantly higher number of meals and spent less time watching television. no association was observed between time spent in front of a screen and number of sleep hours of body mass index. conclusions: men and smokers spend more time working in computers. there is no association between body mass index and time spent in front of screens.
Screen viewing, body mass index, cigarette smoking and sleep duration in Belgrade University student population: results of an observational, cross-sectional study Asociación entre el tiempo dedicado a actividades sedentarias e índice de masa corporal en estudiantes universitarios en Belgrado
Igor Pantic,Milica Malbasa,Sinisa Ristic,Drenka Turjacanin
Revista médica de Chile , 2011,
Abstract: Background: Subjects that spend more time working on computers or watching television could have a higher body mass index. Aim: To assess the relationship between time spent in front of a screen and studying, body mass index (BMI), smoking, and sleep duration among university students. Material and Methods: A cross-sectional study of 734 randomly selected students aged 21 ±2 years (450 females) that responded an anonymous, structured questionnaire about time spent watching television or in front of a computer, time spent studying, number of daily hours of sleep, smoking habits and number of daily meals. Body mass index was also calculated for all subjects Results: Among males, the number of daily sleep hours, time spent working with computers and number of daily meals were significantly higher and time spent studying was significantly lower than females. Nonsmokers ate a significantly higher number of meals and spent less time watching television. No association was observed between time spent in front of a screen and number of sleep hours of body mass index. Conclusions: Men and smokers spend more time working in computers. There is no association between body mass index and time spent in front of screens. Antecedentes: Aquellos individuos que trabajan en computadores o ven televisión por mucho tiempo pudieran tener un índice de masa corporal mayor. Propósito: Evaluar la asociación entre el tiempo ocupado viendo televisión o trabajando en el computador, índice de masa corporal, hábito de fumar y horas diarias de sue o en estudiantes universitarios. Material y Métodos: Se efectuó un estudio transversal de 734 estudiantes elegidos al azar de 21 ±2 a os de edad (450 mujeres), que respondieron una encuesta acerca del número de horas que pasaban viendo televisión, trabajando en un computator o estudiando, el número de horas diarias de sue o, hábito tabáquico y número diario de comidas. Además se calculó el índice de masa corporal de los encuestados. Resultados: Los hombres dormían más horas por día, pasaban más tiempo trabajando en computadores o viendo televisión y estudiaban menos horas por día que las mujeres. Los no fumadores comían más comidas por día y permanecían menos horas viendo televisión. No hubo una asociación significativa entre el número de horas enfrente de una pantalla o la cantidad de horas diarias de sue o con el índice de masa corporal. Conclusiones: Los hombres y los fumadores pasan más tiempo viendo televisión o trabajando en computadores. No se observó una relación entre el tiempo que se permanece frente a una pantalla y el índice de
Thyroid Hormones in Rats with Hyperluteinized Ovaries
M. Demajo,P. Plamenac,A. Karakasevic,V. Pantic
Journal of Medical Sciences , 2001,
Abstract: The findings of research work showed that animals with hyperluteinized ovaries (HL) obtained after mechanical lesions in the posterior hypothalamus, the circulatory patterns of pituitary and ovarian steroid hormones were disturbed. In these animals the pre-ovulatory surge of luteinizing hormone (LH) was lower and prolactin (Prl) was higher, while in early proestrus estradiol was higher, and progesterone in late proestrus was lower when compared to the intact controls. It is recognized that there is a close relationship between ovarian function and thyroid hormones, measured the serum content of total tri-iodothyronine (T3) and thyroxine (T4) in animals with hyperluteinized ovaries obtained after mechanical lesions in the posterior hypothalamus. There were no a significant differences in the circulatory concentrations of these hormones between rats with HL and intact controls. Histological analysis also showed that there were no significant differences in structure of thyroids between the two groups of animals, although the weights of the thyroid glands in the lesioned animals were significantly heavier than in intact controls. These results showed that lesions in the posterior hypothalamus, which result in a disturbance of the hypothalamo-pituitary-ovarian axis inducing HL, did not bring about changes in the hypothalamo-pituitary-thyroid axis.
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