A5071526251- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Cognitive Radio Networks and Spectrum Sensing
- Superconducting Materials and Applications
- Gyrotron and Vacuum Electronics Research
- Remote-Sensing Image Classification
- Plasma Diagnostics and Applications
- Distributed Sensor Networks and Detection Algorithms
- Wireless Signal Modulation Classification
- Magnetic Field Sensors Techniques
- Remote Sensing and Land Use
- Advanced Image Fusion Techniques
- Electric and Hybrid Vehicle Technologies
- Advanced Queuing Theory Analysis
- Power Systems Fault Detection
- Pulsed Power Technology Applications
- Railway Systems and Energy Efficiency
- Erosion and Abrasive Machining
- Remote Sensing in Agriculture
- Microgrid Control and Optimization
- Sparse and Compressive Sensing Techniques
- Surface Treatment and Residual Stress
- Advanced Image Processing Techniques
- Electric Vehicles and Infrastructure
- Advanced optical system design
Automotive Research Association of India
2024
Indian Institute of Information Technology Vadodara
2023-2024
Dhirubhai Ambani Institute of Information and Communication Technology
2018-2021
Institute for Plasma Research
2006-2019
ITER
2016
New Mexico Institute of Mining and Technology
2009
Cognitive radio (CR) serves as an effective solution to the spectrum scarcity issue in current wireless communication. Spectrum sensing is one of key enabling technologies for CR. based on single user detection often suffers from channel ailments such path loss, fading, and shadowing. Cooperative (CSS) proposed overcome these adverse effects. However, CSS easy target malicious users (MUs). The Byzantine attack a major hurdle success Hence, identification MUs CR network essential improve...
In this paper, we propose a novel approach for spectral unmixing based on unsupervised learning using autoencoder with Inhomogeneous Gaussian Markov random field (IGMRF) as prior regularization. The decoder part of our has linear weights making it mixture model (LMM). represent the endmember matrix that makes hidden unit abundances. IGMRF is used to apply spatial regularization abundances also preserves discontinuities. To incorporate regularization, use priors endmembers. addition, and...
Cooperative Spectrum Sensing (CSS) is an effective approach used to determine accessible spectrum in cognitive radio networks (CRN). However, CSS susceptible being attacked by malicious users (MUs) launching the Byzantine attack, which degrades performance. This study focuses on reducing effects of MUs performance and identifying CRN. We propose entropy-based weighted algorithm for CSS, not only enhances but also enables detection Extensive analysis demonstrates superiority proposed...
Abundance estimation is used to infer the proportions of endmembers with given endmember signatures and reflectance value at each location. In this paper, we propose a two-phase iterative approach estimate abundances (fractions) materials (endmembers) from pixels hyperspectral images (HSIs) by using energy minimization framework. A linear mixture model define data term. We observe that abundance maps have homogeneous regions limited discontinuity, they exhibit spatial redundancy. Hence, use...
The fast evolution of digital data exchange has forced the information security to be much important in storage and transmission.As large amount is transmitted over network, it preliminary secure all types before sending them.The problem with AES, most extensively used encryption that uses many multi variant equations which are linear nature.Thus can broken using algebraic cryptanalysis.This provides a serious threat as AES was considered unbreakable thus systems.The current paper presents...
Hyperspectral image (HSI) Super-resolution (SR) methods enhance the spatial resolution. In this paper, we propose a novel SR approach for HSIs by making use of spectral unmixing and transfer learning. We first train deep convolutional neural network (CNN) to learn mapping between low-resolution (LR) high-resolution (HR) natural images same learning get initial estimates super-resolved abundances where input corresponds LR abundances. To better hence improve HSIs, regularization framework in...
In the process of studying charge holding capability and delay time for breakdown in liquids under nanosecond (ns) scales, a Tesla based pulse generator has been developed. Pulse is combination transformer, forming line, fast closing switch, test chamber. Use transformer over conventional Marx generators makes very compact, cost effective, requires less maintenance. The system designed developed to deliver maximum output voltage 300 kV rise order tens nanoseconds. paper deals with design...
We have constructed and operated an automated instrument for measuring ground-level microthermal seeing at the Magdalena Ridge Observatory (MRO). The MRO is located altitude of 10500' in Cibola National Forest New Mexico, USA. It planned site Optical Interferometer (MROI) up to 10 collecting elements, each with a diameter 1.4 m, baselines eventually approximately 400 m. As part preparation construction we deployed system characterize across observatory site. built largely off-the-shelf...
The 42GHz Electron Cyclotron resonance Heating (ECRH) system is used in tokamaks Aditya and SST-1 to carry out ECRH related experiments at fundamental second harmonic. Gyrotron capable deliver 500kW power for 500ms duration commissioned tokamak hall ~75m long transmission line laid connect both the tokamaks. corrugated waveguide (φ63.5mm) based normal atmospheric pressure transmit HE11 mode. special feature of this that it consists two switches, which facilitates either without changing any...
Cooperative spectrum sensing (CSS) is a key approach in cognitive radio (CR) systems for dealing with fading, shadowing, and concealed node problems. CSS improves detection performance by utilizing the spatial range that results from cooperative secondary users (CSUs). As part of centralized CSS, these CSUs collaborate to share information fusion center (FC), which makes global decisions. However, malicious (MUs) can significantly decrease operation's accuracy. The crucial problem Byzantine...
Automatic Modulation Classification (AMC) represents a technique utilised to discern the modulation scheme employed in radio signals at receiver's end. This holds substantial importance within intelligent receivers, which serve as pivotal components for upcoming wireless communication technologies like cognitive and adaptive modulation. Deep learning (DL) has gained widespread use automatic classification due its exceptional capabilities enhanced performance. In this paper, we introduce...
<div class="section abstract"><div class="htmlview paragraph">The article presents radio frequency electromagnetic emission measurement results from a Vehicle semi-anechoic chamber (VSAC) with different electric drivetrains under loading conditions. The measurements are conducted based on AIS 004 part-3 and CISPR 12 standard guidelines in which radiated broadband emissions the range of 30 MHz to 1 GHz using quasi-peak detector is measured [<span class="xref">1</span>,...
In this paper, we propose an algorithmic approach to estimate fractions (abundances) of materials (endmembers) in a pixel by considering linear mixture model (LMM) and prior knowledge endmembers. We the use inhomogeneous Gaussian Markov random field (IGMRF) that captures smoothness as well preserves discontinuities among abundance values. obtain IGMRF parameters for proposed using initial abundances both are refined optimizing objective function. A two-step iterative is final estimates maps...
A compact generator based on Tesla transformer for application in plasma opening switch has been developed. This system will be used to produce microwave plasma-microwave interaction studies. Overall dimension of this is 6 feet by 4 feet. designed operate with up 350 kV water pulsed forming line generate 75 kA, 40 ns pulse, which further compressed time the help switch. Operation VIRCATOR (virtual cathode oscillator) as a load presented paper
Several plasma discharge campaigns have been carried out in steady state superconducting tokamak (SST-1). SST-1 has toroidal field (TF) and poloidal (PF) magnet system (SCMS). The TF coils is cooled to 4.5 - 4.8 K at 1.5 – 1.7 bar(a) under two phase flow condition using 1.3 kW helium cryo plant. Experience revealed that the PF demand higher pressure heads even lower temperatures comparison because of its longer hydraulic path lengths. Thermal run away are observed within single common...
Throughout its history, BP Solar has focussed strongly on the production of integrated power solutions to it's customers, using photovoltaics as central, but not unique, technology. This paper discusses customer driven development two 'new generation' hybrid systems, one AC other DC. Both involve combination with a conventional source (diesel/wind) in fully system, well providing remote electronic system access, advanced data and event logging, comprehensive computer graphic analysis software.
During a few recent lunar missions, possibility of water ice existing in the permanently shadowed regions on moon has come forward.The content is an open question current study.It known that existence mixed with regolith can affect permittivity surface material and consequently to microwave brightness temperature surface.In this paper, we have considered measured soil simulant JSC-1A pure ice.A dielectric mixing models been discussed Odelevsky model used derive effective mixture.The...
A repetitive compact Tesla transformer and plasma-opening switch (POS) based VIRCATOR system has been developed. This whole generates electrical powers well in excess of 20 GW a single shot can be operated up-to 10 Hz. power is converted into the microwave by using with efficiency around one percent. Plasma opening being used as for enhancing feeding voltage to axial VIRCATOR. Two supplies 40 kV, 750 mA Hz are charging capacitors plasma guns POS.
As a part of up gradation plans in SST-1 Tokamak, one pair 3.3 kA rated prototype hybrid current leads were developed using Di-BSCCO as High Temperature Superconductors (HTS) and the copper heat exchanger. In order to validate manufacturing procedure prior go for series production such leads, it was recommended test these dedicated very reliable DC switch mode power supply (SMPS). facility, 12 kA, 16 VDC programmable SMPS successfully installed, commissioned tested. This has special features...