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Search Results: 1 - 10 of 2443 matches for " Autish Chandra Moulik "
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Handwritten Numeric and Alphabetic Character Recognition and Signature Verification Using Neural Network  [PDF]
Md. Hasan Hasnain Nashif, Md. Badrul Alam Miah, Ahsan Habib, Autish Chandra Moulik, Md. Shariful Islam, Mohammad Zakareya, Arafat Ullah, Md. Atiqur Rahman, Md. Al Hasan
Journal of Information Security (JIS) , 2018, DOI: 10.4236/jis.2018.93015
Abstract: Handwritten signature and character recognition has become challenging research topic due to its numerous applications. In this paper, we proposed a system that has three sub-systems. The three subsystems focus on offline recognition of handwritten English alphabetic characters (uppercase and lowercase), numeric characters (0 - 9) and individual signatures respectively. The system includes several stages like image preprocessing, the post-processing, the segmentation, the detection of the required amount of the character and signature, feature extraction and finally Neural Network recognition. At first, the scanned image is filtered after conversion of the scanned image into a gray image. Then image cropping method is applied to detect the signature. Then an accurate recognition is ensured by post-processing the cropped images. MATLAB has been used to design the system. The subsystems are then tested for several samples and the results are found satisfactory at about 97% success rate. The quality of the image plays a vital role as the images of poor or mediocre quality may lead to unsuccessful recognition and verification.
Flavor Tagging at Tevatron incl. calibration and control
T. Moulik
Physics , 2007, DOI: 10.1016/j.nuclphysbps.2007.05.052
Abstract: This report summarizes the flavor tagging techniques developed at the CDF and D{\O}experiments. Flavor tagging involves identification of the B meson flavor atproduction, whether its constituent is a quark or an anti-quark. It is crucial for measuring the oscillation frequency of neutral B mesons, both in the B^0 and B_S system. The two experiments have developed their unique approaches to flavor tagging, using neural networks, and likelihood methods to disentangle tracks from $b$ decays from other tracks. This report discusses these techniques and the measurement of B^0 mixing, as a means to calibrate the taggers.
Bs Mixing at D0 experiment
Tania Moulik
Statistics , 2008,
Abstract: In this report, we present a preliminary measurement of the Bs0 mixing parameter using samples of four partially reconstructed semileptonic Bs0 decays and one fully reconstructed hadronic decay mode, corresponding to approximately 2.4 fb^{-1} of integrated luminosity. We perform an unbinned likelihood fit to the proper decay length and obtain Dms = 18.53 +- 0.93 (stat.) +- 0.30 (syst) ps^{-1}$.
Interaction between O-GlcNAc Modification and Tyrosine Phosphorylation of Prohibitin: Implication for a Novel Binary Switch
Sudharsana R. Ande, Saby Moulik, Suresh Mishra
PLOS ONE , 2009, DOI: 10.1371/journal.pone.0004586
Abstract: Prohibitin (PHB or PHB1) is an evolutionarily conserved, multifunctional protein which is present in various cellular compartments including the plasma membrane. However, mechanisms involved in various functions of PHB are not fully explored yet. Here we report for the first time that PHB interacts with O-linked β-N-acetylglucosamine transferase (O-GlcNAc transferase, OGT) and is O-GlcNAc modified; and also undergoes tyrosine phosphorylation in response to insulin. Tyrosine 114 (Tyr114) and tyrosine 259 (Tyr259) in PHB are in the close proximity of potential O-GlcNAc sites serine 121 (Ser121) and threonine 258 (Thr258) respectively. Substitution of Tyr114 and Tyr259 residues in PHB with phenylalanine by site-directed mutagenesis results in reduced tyrosine phosphorylation as well as reduced O-GlcNAc modification of PHB. Surprisingly, this also resulted in enhanced tyrosine phosphorylation and activity of OGT. This is attributed to the presence of similar tyrosine motifs in PHB and OGT. Substitution of Ser121 and Thr258 with alanine and isoleucine respectively resulted in attenuation of O-GlcNAc modification and increased tyrosine phosphorylation of PHB suggesting an association between these two dynamic modifications. Sequence analysis of O-GlcNAc modified proteins having known O-GlcNAc modification site(s) or known tyrosine phosphorylation site(s) revealed a strong potential association between these two posttranslational modifications in various proteins. We speculate that O-GlcNAc modification and tyrosine phosphorylation of PHB play an important role in tyrosine kinase signaling pathways including insulin, growth factors and immune receptors signaling. In addition, we propose that O-GlcNAc modification and tyrosine phosphorylation is a novel previously unidentified binary switch which may provide new mechanistic insights into cell signaling pathways and is open for direct experimental examination.
The $k$-essence scalar field in the context of Supernova Ia Observations
Abhijit Bandyopadhyay,Debashis Gangopadhyay,Arka Moulik
Physics , 2011, DOI: 10.1140/epjc/s10052-012-1943-z
Abstract: A $k$-essence scalar field model having (non canonical) Lagrangian of the form $L=-V(\phi)F(X)$ where $X=1/2g^{\mu\nu}\nabla_{\mu}\phi\nabla_{\nu}\phi$ with constant $V(\phi)$ is shown to be consistent with luminosity distance-redshift data observed for type Ia Supernova. For constant $V(\phi)$, $F(X)$ satisfies a scaling relation which is used to set up a differential equation involving the Hubble parameter $H$, the scale factor $a$ and the $k$-essence field $\phi$. $H$ and $a$ are extracted from SNe Ia data and using the differential equation the time dependence of the field $\phi$ is found to be: $\phi(t) \sim \lambda_0 + \lambda_1 t + \lambda_2 t^2$. The constants $\lambda_i$ have been determined. The time dependence is similar to that of the quintessence scalar field (having canonical kinetic energy) responsible for homogeneous inflation. Furthermore, the scaling relation and the obtained time dependence of the field $\phi$ is used to determine the $X$-dependence of the function $F(X)$.
Semi-classical treatment of $k$-essence effect on cosmic temperature
Abhijit Bandyopadhyay,Debashis Gangopadhyay,Arka Moulik
Physics , 2014,
Abstract: A phenomenological model is described for Cosmic Microwave Background Radiation (CMBR) evolution with dark energy an essential ingredient in the form of a $k-$essence scalar field. The following features of this evolution can be successfully obtained from this model: (a) the {\it observed} variation of the rate of change of scale factor $a(t)$, i.e. $\dot a$, with time and (b) the {\it observed} value of the epoch when the universe went from a decelerating phase to an accelerated phase. These two features have been matched with graphical transcriptions of SNe Ia data. The model also indicates that the evolution is sensitive to the presence of inhomogeneity and this sensitivity increases as one goes further into the past. Further, the value of the inhomogeneity parameter determines the epoch of switch over to an accelerated phase. A positive value of inhomogeneity parameter leads to switch over at earlier epochs, while a negative value leads to switch over at later epochs. If the value of the inhomogeneity parameter is a bit negative then the crossover point from deceleration to acceleration gives better agreement with the observed value.
Duality in Solving Multi-Objective Optimization (MOO) Problems  [PDF]
Chandra Sen
American Journal of Operations Research (AJOR) , 2019, DOI: 10.4236/ajor.2019.93006
Abstract: Multi-Objective Optimization (MOO) techniques often achieve the combination of both maximization and minimization objectives. The study suggests scalarizing the multi-objective functions simpler using duality. An example of four objective functions has been solved using duality with satisfactory results.
Phosphatidylinositol 3-Kinase and NF-kappaB Involved in Epidermal Growth Factor-Induced Matrix Metalloproteinase-9 Expression
Shuvojit Moulik,Triparna Sen,Anindita Dutta,Aniruddha Banerji
Journal of Cancer Molecules , 2008,
Abstract: AIM: Matrix metalloproteinase-9 (MMP-9) is a zinc-dependent endopeptidase that is capable of digesting the components of extracellular matrix and basement membrane influencing cancer cell invasion and metastasis. This study is to investigate the signaling pathways responsible for epidermal growth factor (EGF)-induced MMP-9 expression. METHODS: Gelatinase zymography, RT-PCR, and Western blot analysis were exploited to detect the induction of MMP-9 expression in EGF-treated human breast cancer MDA-MB-231 cells. EGF-induced nuclear translocation of EGF receptor (EGFR) and NF-kappaB was demonstrated by immunofluorescence. RESULTS: EGF induced nuclear translocation of EGFR and gene expression of MMP-9 in MDA-MB-231 cells. Phosphorylation of phosphatidylinositol 3-kinase (PI3-K) and nuclear localization of NF-kappaB were also observed with EGF-treated MDA-MB-231 cells. EGF-induced MMP-9 expression was significantly prevented by the inhibitors against PI3-K or NF-kappaB. When MDA-MB-231 cells were treated with curcumin prior to the EGF treatment, cellular EGFR level was drastically reduced and EGF-induced MMP-9 expression was also efficiently prevented. CONCLUSION: EGF induced expression of MMP-9 in MDA-MB-231 cells through the NF-kappaB and PI3-K pathways. Curcumin was able to down regulate cellular EGFR level and inhibit EGF-induced MMP-9 expression.
Positron Annihilation Study of Biopolymer Inulin for Understanding its Structural Organization
Bichitra Nandi Ganguly,Madhusudan Roy,S. P. Moulik
Physics , 2014,
Abstract: Inulins are nano-meter size semi-crystalline particles, composed of oligomeric fructose units. It has been subjected to fine micro-structural analysis under temperature variations using mainly positron annihilation spectroscopy. The results show a non-monotonous temperature sensitive behaviour of the positron parameters, with considerable variation of its free volume size. The ortho-positronium pick-off component shows a major thermotropic transition at ~320K and a structure loss due to glass transition. Differential scanning calorimetry confirms the onset of the major molecular transition around the same temperature with an enthalpy change of {\Delta}H ~379J /gm and thermo-gravimetric analysis shows mass loss in the said transition. Keywords: Inulin, fructose units, positron annihilation spectroscopy, microstructure, free volume analysis. thermotropic transition, thermal analysis.
Cation Distribution in Lithium Ferrite (LiFe5O8) Prepared via Aerosol Route  [PDF]
Sonal Singhal, Kailash Chandra
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2010, DOI: 10.4236/jemaa.2010.21008
Abstract: Nano size lithium ferrite was prepared through aerosol route and characterized using TEM, XRD, magnetic measurements and Mössbauer spectroscopy. The particle size of as obtained samples were found to be ~10 nm through TEM, that increases upto ~80 nm on annealing at 1200 oC. The unit cell parameter ‘a’ calculated using XRD, confirms the formation of ?-LiFe5O8. Room temperature Mössbauer spectra of as obtained sample of all the ferrites exhibited broad doublet suggesting super paramagnetic nature. This doublet further resolved into two doublets and assigned to the surface region atoms and internal region atoms of the particles. The annealed samples (1200 oC) show broad sextets, which were fitted with two sextets indicating different local environment of both tetrahedrally and octahedrally coordinated Fe-cation. Cation distribution obtained from the X-ray, magnetic and Mössbauer data confirms that the three fifth of the iron atom goes in to the octahedral site.
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