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Partially Occluded Face Reconstruction Using Graph-based Algorithm
Meena Manisha Kumari,Meena Hemant Kumar,Sharma Ramnivas 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.6
This study introduces a novel algorithm rooted in spectral graph theory for the reconstruction of occluded facial images, with the aim of enhancing face recognition accuracy. The proposed method, Face Reconstruction using Graph Fourier Transform (FRGFT) comprises three key stages: fi rstly, construct a graph representation of the image where each pixel is a node, and edges between nodes represent pixel adjacency with weights that capture both intensity and spatial relationships; secondly, identify occluded parts of the image using a graph-based segmentation technique to update the occlusion mask; and thirdly, reconstruct the original image from the occluded version using the Laplacian matrix of the graph and the updated occlusion mask. The whole process lies on the Graph Laplacian (GL) technique, which draws the concepts from graphical models and the Laplace equation, proving to be eff ective in the high-quality restoration of faces that are damaged or occluded. This paper establishes the connection between GL and the traditional Fourier transform methods. To assess the utility of the GLbased restoration, completed facial images processed through the algorithm are subjected to face recognition testing. The eff ectiveness of the proposed approach is validated on two datasets: extended AR and CelebA face dataset, which have been signifi cantly noticeable as our proposed approach achieves 98.5% accuracy as compared with the existing method.
Meena, Daleep K.,Akunuri, Shalini,Meena, Preetam,Bhramer, Ashok,Sharma, Shiv D.,Gupta, Rajkumar The Korean Society of Pediatric Gastroenterology 2019 Pediatric gastroenterology, hepatology & nutrition Vol.22 No.4
Purpose: This study aimed to evaluate a possible association between the anti-tissue transglutaminase antibody (anti-tTG) titer and stage of duodenal mucosal damage and assess a possible cut-off value of anti-tTG at which celiac disease (CD) may be diagnosed in children in conjunction with clinical judgment. Methods: This observational study was conducted at a gastroenterology clinic in a tertiary hospital from April 2012 to May 2013. Seventy children between 6-months and 18-years-old with suspected CD underwent celiac serology and duodenal biopsy. Statistical analyses were done using SPSS 16. Diagnostic test values were determined for comparing the anti-tTG titer with duodenal biopsy. An analysis of variance and Tukey-Kramer tests were performed for comparing the means between groups. A receiver operating characteristics curve was plotted to determine various cut-off values of anti-tTG. Results: The mean antibody titer increased with severity of Marsh staging (p<0.001). An immunoglobulin (Ig) A-tTG value at 115 AU/mL had 76% sensitivity and 100% specificity with a 100% positive predictive value (PPV) and 17% negative predictive value (NPV) for diagnosis of CD (p<0.001, 95% confidence interval [CI], 0.75-1). Conclusion: There is an association between the anti-tTG titer and stage of duodenal mucosal injury in children with CD. An anti-tTG value of 115 AU/mL (6.4 times the upper normal limit) had 76% sensitivity, 100% specificity, with a 100% PPV, and 17% NPV for diagnosing CD (95% CI, 0.75-1). This cut-off may be used in combination with clinical judgment to diagnose CD.
Daleep K. Meena,Shalini Akunuri,Preetam Meena,Ashok Bhramer,Shiv D. Sharma,Rajkumar Gupta 대한소아소화기영양학회 2019 Pediatric gastroenterology, hepatology & nutrition Vol.22 No.4
Purpose: This study aimed to evaluate a possible association between the anti-tissue transglutaminase antibody (anti-tTG) titer and stage of duodenal mucosal damage and assess a possible cut-off value of anti-tTG at which celiac disease (CD) may be diagnosed in children in conjunction with clinical judgment. Methods: This observational study was conducted at a gastroenterology clinic in a tertiary hospital from April 2012 to May 2013. Seventy children between 6-months and 18-years-old with suspected CD underwent celiac serology and duodenal biopsy. Statistical analyses were done using SPSS 16. Diagnostic test values were determined for comparing the anti-tTG titer with duodenal biopsy. An analysis of variance and Tukey-Kramer tests were performed for comparing the means between groups. A receiver operating characteristics curve was plotted to determine various cut-off values of anti-tTG. Results: The mean antibody titer increased with severity of Marsh staging ( p <0.001). An immunoglobulin (Ig) A-tTG value at 115 AU/mL had 76% sensitivity and 100% specificity with a 100% positive predictive value (PPV) and 17% negative predictive value (NPV) for diagnosis of CD ( p <0.001, 95% confidence interval [CI], 0.75–1). Conclusion: There is an association between the anti-tTG titer and stage of duodenal mucosal injury in children with CD. An anti-tTG value of 115 AU/mL (6.4 times the upper normal limit) had 76% sensitivity, 100% specificity, with a 100% PPV, and 17% NPV for diagnosing CD (95% CI, 0.75–1). This cut-off may be used in combination with clinical judgment to diagnose CD.
Meena Prathwiraj,Singh Surabhi,Sharma Manisha,Saharan Virendra Kumar,George Suja,Bhoi Rohidas 한국화학공학회 2024 Korean Journal of Chemical Engineering Vol.41 No.4
In this work, the fossil fuel-based thermoplastics, i.e., low-density polyethylene (LDPE), polypropylene (PP), and polystyrene (PS) were pyrolyzed at 450 °C, 500 °C, and 550 °C thermally and catalytically to enhance the oil yield and further enrichment via fractionation. In the catalytic process, spent FCC (sFCC) and low-cost BaCO 3 with 10 wt% loading were used in a semibatch quartz reactor. Thermogravimetric analysis (TGA) and derivative thermogravimetric analysis (DTG) were carried out at 10 °C/min for LDPE, PP, and PS to analyze the degradation behavior. Among the used catalysts, the sFCC gives higher oil yield than BaCO 3 under identical conditions. The LDPE oil yield obtained was 55.5% and 35.7% for sFCC and BaCO 3 , respectively. Similar trends were observed for PP (80.0% and 70.0%) and PS (98.0% and 95.0%). Gas chromatography–mass spectrometry (GC–MS) analysis revealed that product oil composition obtained for sFCC-catalyzed pyrolysis process was majorly in the gasoline range (C 6 –C 12 ) whereas for BaCO 3 enabled pyrolysis in the diesel range (C 13 –C 18 ). Plausible acid and base-catalyzed reaction mechanism and product formation are discussed for catalytic pyrolysis of PP. Fractionation of pyrolysis oil was performed at 150 °C, 250 °C, and 350 °C and physiochemical properties as well as the visual inspection of resulting fractions were carried out as per ASTM methods. Overall, this work represents the utilization of sFCC and low-cost BaCO 3 catalyst to convert plastic waste into promising fuel.
THE HYDROMAGNETIC FLOW BETWEEN ECCENTRIC CYLINDERS WITH VELOCITY SLIP AT THE CYLINDER WALLS
Meena, S.,Kandaswamy, P. 한국전산응용수학회 1999 Journal of applied mathematics & informatics Vol.6 No.2
The hydrodynamic flow between two eccentric cylinders is examined for small values of modified Reynolds number porosity parameter and the non-dimensional slip velocity parameter in the presence of a radial magnetic field. The stream function and the pres-sure distribution are calculated and the results are presented graph-ically.
Aging Mechanism of p-Type Dopingless JLFET: NBTI and Channel-Hot-Carrier Stress
Meena Panchore,Chithraja Rajan 한국전기전자재료학회 2023 Transactions on Electrical and Electronic Material Vol.24 No.2
In this work, an extensive study of the aging mechanisms of the p-type dopingless JLFET (DL JLFET) structure is reported for the first time. The negative-bias-temperature-instability (NBTI) and channel-hot-carrier (CHC) stress conditions are considered for analyzing the aging behavior of p-type DL JLFET. The variations in electrical characteristics of lightly doped DL JLFET are compared with its conventional counterpart JLFET against NBTL and CHC stress. We have shown that JLFET with heavily doped channel region exhibits higher drain current degradation under CHC stress due to high electric field and large gate leakage current. The JLFET has 19% drain current degradation due to CHC stress which is 1.7 times higher than DL JLFET. However, under NBTI stress, the DL JLFET has slightly higher drain current degradation and almost symmetric shift in Vth than JLFET. Hence, this study suggests that dopingless devices are superior candidate for designing aging-resilient and more reliable circuits.
Pt-like hydrogen evolution on a V2O5/Ni(OH)2 electrocatalyst
Meena, Abhishek,Ha, Miran,Chandrasekaran, S. Selva,Sultan, Siraj,Thangavel, Pandiarajan,Harzandi, Ahmad M.,Singh, Bhupendra,Tiwari, Jitendra N.,Kim, Kwang S. The Royal Society of Chemistry 2019 Journal of materials chemistry. A, Materials for e Vol.7 No.26
<P>We report a highly efficient and cost-effective binder-free catalyst for the hydrogen evolution reaction (HER) using V2O5 particles on nickel foam (NF) (V2O5/Ni(OH)2@NF). This low-cost catalyst exhibits Pt-like activity with a low overpotential of 39 mV at 10 mA cm<SUP>−2</SUP> (lowest among V-based materials which are known to be generally non-explosive and safe) and long-term stability in a 1 M KOH solution. The overall performance is highly comparable to that of a commercial 20% Pt/C catalyst on NF. Furthermore, the V2O5/Ni(OH)2@NF outperforms the Pt/C catalyst at a higher current density (100 mA cm<SUP>−2</SUP>) which is more preferable for industrial applications. First principles calculations show that the remarkable HER activity is ascribed to the near-zero adsorption free energy (Δ<I>G</I>H*) on the Ni-site of Ni(OH)2@NF and the Ni- and O-sites of <I>in situ</I> generated V2O5@NF, due to the charge transfer arising from adsorbed O atoms on Ni(111), along with high conductivity of NF. O-adsorption on the Ni transition metal surface downshifts the d-band center of the transition metal, which helps in quick hydrogen desorption by weakening the hydrogen binding strength. As a result, most Ni fcc sites of V2O5/Ni(OH)2@NF are more active than pristine Ni fcc sites. The V2O5/Ni(OH)2@NF catalyst initiates overall water splitting at 1.53 V in a 6 M KOH solution for solar-to-hydrogen generation in a two-electrode set-up using a solar panel.</P>