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Pankaj,Ashish Kumar,Manjeet Kumar,Rama Komaragiri 대한의용생체공학회 2023 Biomedical Engineering Letters (BMEL) Vol.13 No.4
Appropriate blood pressure (BP) management through continuous monitoring and rapid diagnosis helps to take preventivecare against cardiovascular diseases (CVD). As hypertension is one of the leading causes of CVDs, keeping hypertensionunder control by a timely screening of subjects becomes lifesaving. This work proposes estimating BP from motion artifactaffectedphotoplethysmography signals (PPG) by applying signal processing techniques in realtime. This paper proposes adeep neural network-based methodology to accurately classify PPG signals using a Fourier theory-based time–frequency(TF) spectrogram. This work uses the Fourier decomposition method (FDM) to transform a PPG signal into a TF spectrogram. In the proposed work, the last three layers of the pre-trained deep neural network, namely, GoogleNet, DenseNet, andAlexNet, are modified and then used to classify the PPG signal into normotension, pre-hypertension, and hypertension. Theproposed framework is trained and tested using the MIMIC-III and PPG–BP databases using five-fold training and testing. Out of the three deep neural networks, the proposed framework with the DenseNet-201 network performs best, with a testaccuracy of 96.5%. The proposed work uses FDM to compute the TF spectrogram to accurately separate the motion artifactsand noise components from a noise-corrupted PPG signal. Capturing more frequency components that contain moreinformation from PPG signals makes the deep neural networks extract better and more meaningful features. Thus, training adeep neural network model with clean PPG signal features improves the generalized capability of a BP classification modelwhen tested in realtime.
THREE-DIMENSIONAL LORENTZIAN PARA-KENMOTSU MANIFOLDS AND YAMABE SOLITONS
( Pankaj ),( Sudhakar K. Chaubey ),( Rajendra Prasad ) 호남수학회 2021 호남수학학술지 Vol.43 No.4
The aim of the present work is to study the properties of three-dimensional Lorentzian para-Kenmotsu manifolds equipped with a Yamabe soliton. It is proved that every three-dimensional Lorentzian para-Kenmotsu manifold is Ricci semi-symmetric if and only if it is Einstein. Also, if the metric of a three-dimensional semi-symmetric Lorentzian para-Kenmotsu manifold is a Yamabe soliton, then the soliton is shrinking and the flow vector field is Killing. We also study the properties of threedimensional Ricci symmetric and η-parallel Lorentzian para-Kenmotsu manifolds with Yamabe solitons. Finally, we give a non-trivial example of three-dimensional Lorentzian para-Kenmotsu manifold.
Morphological and electro-optical responses of dichroic polymer dispersed liquid crystal films
Pankaj Kumar,K.K. Raina 한국물리학회 2007 Current Applied Physics Vol.7 No.6
polymerization induced phase separation technique using nematic liquid crystal material in UV curable polymer NOA 65 and anthra-quinone dichroic dye. The eects of applied voltage and temperature on the LC droplet morphology and its optical characteristics werestudied in detail. Liquid crystal droplets containing low concentration of dye (6 0.25%) in polymer matrix exhibit bipolar conguration atlower applied voltage (6 10 V) whereas at relatively higher voltage (Plow concentration DPDLC lm shows better optical transmission and higher contrast ratio.
Pankaj Agarwal,Mukesh Kumar,Mahavir Choudhary,Ankush Sharma,Amar Patnaik 한국섬유공학회 2022 Fibers and polymers Vol.23 No.5
This work clearly demonstrates the effective utilization of industrial waste metal fiber to replace glass fiber loadingfor the development of hybrid glass/metal fiber reinforced polymer composites for marine applications. The presentcomposite is fabricated by vacuum assisted resin transfer modelling technique under controlled conditions by varying bothglass fiber and metal fiber in a desired percentage weight ratio. The fabricated hybrid composites are characterized byphysical (density and void content), mechanical (tensile strength, flexural strength, inter-laminar shear strength and impactstrength), thermomechanical analysis (storage modulus, loss modulus and damping factor), water absorption, thermalconductivity and thermo-gravimetric analysis respectively. The second part of this study mainly covers the simulationanalysis of both mechanical properties and the thermal conductivity of the hybrid polymer composites. This analysis mainlyhelps to understand the major causes affecting during experimental analysis along with finding the desired results bycomparing them with the experimental results. The last part of this analysis focuses on studying the composite defects duringmechanical characterization with the help of scanning electron microscope. Finally, adopted multicriteria decision-makingtechnique to optimize the process parameters by considering all the obtained experimental results to satisfy the proposedapplication specifically can be used for marine structure development.
Cavitating Turbulent Flow Study for Low Head Francis Turbine by Transient Analysis
Pankaj P Gohil,R P Saini 한국유체기계학회 2019 International journal of fluid machinery and syste Vol.12 No.1
Cavitation is undesirable phenomenon and it is difficult to eliminate completely, however it is minimized to the acceptable limits. It becomes more severe under off-design conditions and lower tail race level. Shear Stress Transport (SST) turbulence model and Rayleigh-Plesset mass transfer models are used using CFX solver for performing the transient simulation and investigating the cavitation turbulent flow through Francis turbine. An attempt has been carried out to analysis of cavitating flow at low head Francis turbine under different operating conditions having varying suction heads. Experimentation has been carried out to validate the simulation results. It was found that obtained simulation results are very close agreement with experimental results. Summarizing, the performance loss and cavitation rate are found maximum under over load operating conditions. At part load operating conditions of the turbine, high amplitude of pressure at low frequency has been found which may cause fatigue damage to the turbine over time. Cavitation rate, performance loss and magnitude of pressure pulsation increase with increase of suction head.
Pankaj V. Katariya,Subrata Kumar Panda 국제구조공학회 2020 Steel and Composite Structures, An International J Vol.34 No.2
The computational post-buckling strength of the tilted sandwich composite shell structure is evaluated in this article. The computational responses are obtained using a mathematical model derived using the higher-order type of polynomial kinematic in association with the through-thickness stretching effect. Also, the sandwich deformation behaviour of the flexible soft-core sandwich structural model is expressed mathematically with the help of a generic nonlinear strain theory i.e. Green-Lagrange type strain-displacement relations. Subsequently, the model includes all of the nonlinear strain terms to account the actual deformation and discretized via displacement type of finite element. Further, the computer code is prepared (MATLAB environment) using the derived higher-order formulation in association with the direct iterative technique for the computation of temperature carrying capacity of the soft-core sandwich within the post-buckled regime. Further, the nonlinear finite element model has been tested to show its accuracy by solving a few numerical experimentations as same as the published example including the consistency behaviour. Lastly, the derived model is utilized to find the temperature load-carrying capacity under the influences of variable factors affecting the soft-core type sandwich structural design in the small (finite) strain and large deformation regime including the effect of tilt angle.