4,967 research outputs found

    Controlling a remotely located Robot using Hand Gestures in real time: A DSP implementation

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    Telepresence is a necessity for present time as we can't reach everywhere and also it is useful in saving human life at dangerous places. A robot, which could be controlled from a distant location, can solve these problems. This could be via communication waves or networking methods. Also controlling should be in real time and smooth so that it can actuate on every minor signal in an effective way. This paper discusses a method to control a robot over the network from a distant location. The robot was controlled by hand gestures which were captured by the live camera. A DSP board TMS320DM642EVM was used to implement image pre-processing and fastening the whole system. PCA was used for gesture classification and robot actuation was done according to predefined procedures. Classification information was sent over the network in the experiment. This method is robust and could be used to control any kind of robot over distance

    Properties of the integrated spectrum of serendipitous 2XMM catalogue sources

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    Our analysis is aimed at characterizing the properties of the integrated spectrum of active galactic nuclei (AGNs) such as the ubiquity of the Fe K{\alpha} emission in AGNs and the dependence of the spectral parameters on the X-ray luminosity and redshift. We selected 2646 point sources from the 2XMM catalogue at high galactic latitude (|BII| > 25 degrees) and with the sum of EPIC-PN and EPIC-MOS 0.2-12 keV counts greater than 1000. Redshifts were obtained for 916 sources from the NED. The final sample consists of 507 AGN. Individual source spectra have been summed in the observed frame to compute the integrated spectra in different redshift and luminosity bins over the range 0<z<5. Detailed analysis of these spectra has been performed. We find that the narrow Fe K{\alpha} line at 6.4 keV is significantly detected up to z=1. The line equivalent width decreases with increasing X-ray luminosity in the 2-10 keV band (''IT effect''). The anti-correlation is characterized by the relation log(EWFe) = (1.66 +/- 0.09) + (-0.43 +/- 0.07) log(LX,44), where EWFe is the rest frame equivalent width of the neutral iron K{\alpha} line in eV and LX,44 is the 2-10 keV X-ray luminosity in units of 10^{44} erg s^{-1}. The equivalent width is nearly independent of redshift up to z ~ 0.8 with an average value of 101+/-40 (rms dispersion) eV in the luminosity range 43.5<= logLX <= 44.5. Our analysis also confirmed the hardening of the spectral indices at low luminosities implying a dependence of obscuration on luminosity. We confirm that the neutral narrow Fe K{\alpha} line is an almost ubiquitous feature of AGNs. We find compelling evidence for the ''IT effect'' over a redshift interval larger than probed in any previous study. We detect no evolution of the average rest frame equivalent width of the Fe K{\alpha} line with redshift.Comment: 10 pages, 7 figures, 2 Tables. A&A in pres

    Evaluation of role of computed tomography scan brain in children with generalized seizures

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    Objective: To evaluate the role of computed tomography (CT) scan brain in children over the age of 1 year with generalized seizures.Design: Prospective, hospital-based study. Materials and Methods: Children of 1-12 years presenting with generalized seizuresin pediatric outpatient department and emergencies were subjected for CT scan brain with contrast along with other appropriateinvestigations after stabilization. Results: A total of 101 cases of children with generalized seizures underwent CT scan brain, 36 cases(35.64%) were found to have CT brain abnormalities. Conclusion: CT brain should be considered in children with generalized seizuresin health care settings where magnetic resonance imaging is either unavailable or unaffordable

    Rest-frame stacking of 2XMM catalog sources : Properties of the Fe Kalpha line

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    The aim of this work is to characterize the average Fe K emission properties of active galactic nuclei (AGNs) in the source rest-frame. We selected a sample of 248 AGNs from the 2XMM catalog, covering a wide redshift range 0 < z < 5 and with the EPIC-PN net 2-10 keV rest-frame counts >=200 and power law photon indices in the range 1.5-2.2. We employed two fully independent rest-frame stacking procedures to compute the mean Fe K profile. The counting statistics for the integrated spectrum is comparable to the one available for the best studied local Seyferts. To identify the artifacts possibly introduced by the stacking procedure, we have carried out simulations. We report that the average Fe K line profile in our sample is best represented by a combination of a narrow and a broad line. The equivalent widths of the narrow and broad (parametrized with a diskline) components are ~30 eV and ~100 eV, respectively. We also discuss the results of more complex fits and the implications of the adopted continuum modeling on the broad line parameters and its detection significance.Comment: 13 pages, 13 figures, Accepted for publication in A&

    Comparison of total serum immunoglobulin E and absolute eosinophil count levels among asthmatic and non-asthmatic children

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    Background: Immunoglobulin E (IgE) and associated cellular responses such as absolute eosinophil count (AEC) are responsible for allergic airway diseases. A hypersensitivity reaction initiated by immunological mechanisms, mediated by IgE antibodies, and eosinophils occur in allergic asthma. Objective: To compare the total serum IgE level and AEC levels among asthmatic and non-asthmatic children. Methods: The present study was conducted in the department of pediatrics and TB and Chest of a Medical College of North India from October 2015 to November 2016. Children from 3 years to 18 years, 30 with bronchial asthma and 30 healthy children were included in this study randomly. Results: The mean total serum IgE level in children with bronchial asthma was significantly higher (700.97±571.01 IU/ml) than that in healthy children (189.33±14.29 IU/ml). The mean AEC was also significantly higher in cases (746.63±492.02 cells/mm3) as compared to healthy children (220.23±121.69 cells/mm3). In bronchial asthma group, mean AEC increased with the increasing severity of asthma. Conclusion: The elevated level of total serum IgE and AEC may demonstrate the allergic etiology of asthma and hence, estimation of serum IgE and AEC levels can be considered as laboratory investigations in diagnosing cases of bronchial asthma

    Using the Discrete Dipole Approximation and Holographic Microscopy to Measure Rotational Dynamics of Non-spherical Colloidal Particles

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    We present a new, high-speed technique to track the three-dimensional translation and rotation of non-spherical colloidal particles. We capture digital holograms of micrometer-scale silica rods and sub-micrometer-scale Janus particles freely diffusing in water, and then fit numerical scattering models based on the discrete dipole approximation to the measured holograms. This inverse-scattering approach allows us to extract the the position and orientation of the particles as a function of time, along with static parameters including the size, shape, and refractive index. The best-fit sizes and refractive indices of both particles agree well with expected values. The technique is able to track the center of mass of the rod to a precision of 35 nm and its orientation to a precision of 1.5∘^\circ, comparable to or better than the precision of other 3D diffusion measurements on non-spherical particles. Furthermore, the measured translational and rotational diffusion coefficients for the silica rods agree with hydrodynamic predictions for a spherocylinder to within 0.3%. We also show that although the Janus particles have only weak optical asymmetry, the technique can track their 2D translation and azimuthal rotation over a depth of field of several micrometers, yielding independent measurements of the effective hydrodynamic radius that agree to within 0.2%. The internal and external consistency of these measurements validate the technique. Because the discrete dipole approximation can model scattering from arbitrarily shaped particles, our technique could be used in a range of applications, including particle tracking, microrheology, and fundamental studies of colloidal self-assembly or microbial motion.Comment: 11 pages, 9 figures, 2 table

    An Appraisal of the Jamaica Labour Relations and Disputes Act, 1975

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    Maintaining regularity and generalization in data using the minimum description length principle and genetic algorithm: case of grammatical inference

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    In this paper, a genetic algorithm with minimum description length (GAWMDL) is proposed for grammatical inference. The primary challenge of identifying a language of infinite cardinality from a finite set of examples should know when to generalize and specialize the training data. The minimum description length principle that has been incorporated addresses this issue is discussed in this paper. Previously, the e-GRIDS learning model was proposed, which enjoyed the merits of the minimum description length principle, but it is limited to positive examples only. The proposed GAWMDL, which incorporates a traditional genetic algorithm and has a powerful global exploration capability that can exploit an optimum offspring. This is an effective approach to handle a problem which has a large search space such the grammatical inference problem. The computational capability, the genetic algorithm poses is not questionable, but it still suffers from premature convergence mainly arising due to lack of population diversity. The proposed GAWMDL incorporates a bit mask oriented data structure that performs the reproduction operations, creating the mask, then Boolean based procedure is applied to create an offspring in a generative manner. The Boolean based procedure is capable of introducing diversity into the population, hence alleviating premature convergence. The proposed GAWMDL is applied in the context free as well as regular languages of varying complexities. The computational experiments show that the GAWMDL finds an optimal or close-to-optimal grammar. Two fold performance analysis have been performed. First, the GAWMDL has been evaluated against the elite mating pool genetic algorithm which was proposed to introduce diversity and to address premature convergence. GAWMDL is also tested against the improved tabular representation algorithm. In addition, the authors evaluate the performance of the GAWMDL against a genetic algorithm not using the minimum description length principle. Statistical tests demonstrate the superiority of the proposed algorithm. Overall, the proposed GAWMDL algorithm greatly improves the performance in three main aspects: maintains regularity of the data, alleviates premature convergence and is capable in grammatical inference from both positive and negative corpora

    An Appraisal of the Jamaica Labour Relations and Disputes Act, 1975

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    Comparative evaluation of efficacy of terbinafine and itraconazole in treatment of tinea cruris

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    Background: In a hot and humid country like India, the prevalence of superficial mycotic infections is on the rise due to contributing environmental and demographic factors. In this study, we sought to assess the efficacies of two oral antifungal drugs, Itraconazole (a traditional azole) and Terbinafine (the only orally available allylamine). The two drugs were analyzed to see whether they differed significantly in their cure rates of tinea cruris. Since data, that compares only systemically administered Itraconazole and Terbinafine in the treatment of tinea cruris, is limited, this study becomes imperative.Methods: 60 patients, all clinically confirmed cases of tinea cruris and belonging to the age group of 18-65 years, were recruited for this prospective study. Patients were then randomly divided into groups A and B and followed-up for a month. Group A received cap. Itraconazole 100 mg, twice a day, for 15 days while group B received tab. Terbinafine 250 mg, once a day, for 4 weeks. Both groups were given topical 2% Sertaconazole that had to be continued for 8 weeks. During the 4 visits, scores for the 3 parameters (erythema, pruritis and scaling) were calculated and recorded for statistical analysis.Results: Authors observed that majority of the patients were exposed to hot and humid environment that contributed to sweating and poor personal hygiene. The changes in scores of erythema, pruritis and scaling from the baseline visit for both, Itraconazole and Terbinafine, were statistically significant at week 4 with P < 0.05 for all parameters. But the difference between the scores of the two drugs was not found to be statistically significant.Conclusions: Although the sample size of this study was small and the data was limited, findings of this study supported that both Itraconazole and Terbinafine were highly effective in the treatment of tinea cruris
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