Rupam Kumar Das - Academia.edu (original) (raw)

Papers by Rupam Kumar Das

Computers and Devices for Communication, 2021

A new current-mode sinusoidal quadrature oscillator is presented using current differencing trans... more A new current-mode sinusoidal quadrature oscillator is presented using current differencing transconductance amplifier (CDTA). This oscillator circuit is designed using one CDTA and two grounded capacitors. By adjusting the bias of CDTA, the oscillation condition and the oscillation frequency can be controlled. The output of the oscillator is current and has high output impedance. It is resistorless and uses grounded capacitors, which ease the IC implementation. PSPICE simulation satisfies the theoretical results.

The differential difference current controlled current conveyor transconductance amplifier (DVCCC... more The differential difference current controlled current conveyor transconductance amplifier (DVCCCTA) is a novel active building block which can substitute the widely used operational amplifier in analog circuit design. The operation of differential difference current controlled current conveyor transconductance amplifier is different from the operation of operational amplifier. The DVCCCTA can be used to design various circuits like integrator, differentiator, adder, substractor etc. The advantages of DVCCCTA are it has high slew rate, wide bandwidth, and also current processing capabilities at input terminals. Since DVCCCTA is not slew limited in the same fashion of OPAMP, it can provide amplification of high frequency signals with a constant bandwidth virtually independent of gain.

INTERNATIONAL JOURNAL OF ADVANCED ENGINEERING AND MANAGEMENT, Sep 1, 2017

Here a simple current mode Schmitt trigger circuit is designed using a single current controlled ... more Here a simple current mode Schmitt trigger circuit is designed using a single current controlled current differencing transconductance amplifier (CCCDTA). The presented circuit is proposed here by single CCCDTA without utilizing any passive components. A supply voltage of ±1v and 0.35μm TSMC CMOS model parameter is used for the design of Schmitt trigger. The circuit presented in this paper operates at a low voltage and low frequency. The proposed circuit is tested in PSPICE platform and it meet with the theoretical prediction.

IEEE Transactions on Industrial Electronics, 2018

In this study, a metamaterial-coupled, highlyefficient, miniaturized, and long range Wireless Pow... more In this study, a metamaterial-coupled, highlyefficient, miniaturized, and long range Wireless Power Transfer (WPT) system based on a Cubic High Dielectric Resonator (CHDR) is explored. The proposed WPT system consists of two CHDR metamaterials separated by a distance and excited by two rectangular coils. Initially, this WPT system is analyzed by considering the cube dielectric permittivity, εr = 1000, and loss tangent, tanδ = 0.00001. From the Ansoft HFSS simulation, it is observed that the system operates in the hybrid resonance mode resonating as a horizontal magnetic dipole providing more than 90% power transfer efficiency at a distance of 0.1λ. In addition, parametric studies regarding the transmitter and receiver sizes, loss tangent, receiver misorientation, cube periodicity, etc. are carried out. One of the significant findings of this parametric study reveals that the suggested WPT system is less sensitive to the displacement of the receiver coil, and the WPT efficiency due to misorientation of the receiver can be increased by changing the CHDR cube rotation. Due to inaccessibility of the very high εr = 1000, eighteen microwave ceramic samples of EXXELIA TEMEX E5080 (Oxide composition: Ba Sm Ti) which has a permittivity, εr = 78, permeability, µr = 1, and a loss tangent, tanδ = 0.0004 was made for experimental verification. These cubes are surrounded by Teflon to make the CHDR resonators. From simulations and measurements, it is found that the proposed system outperforms the most recent high-dielectric or copper based WPT systems in terms of efficiency, range, size, and Specific Absorption Rate (SAR).

International Journal of Signal Processing, Image Processing and Pattern Recognition, 2016

Intel RealSense™ is an exciting new technology that offers innovative multimodal human computer i... more Intel RealSense™ is an exciting new technology that offers innovative multimodal human computer interaction with hand tracking, face tracking, emotion detection, speech synthesis and voice recognition. The technology supports real time background separation by combining the depth and RGB streams of RealSense™ camera. Several past works have provided robust techniques for background separation. Background separated frame is used to augment segmented user photo in an artificial scene. In this work we propose a novel real time technique for augmenting the user in an artificial scene and apply various image filters on the constructed scene. We also propose a "Split Grid" based novel hand gesture driven UI control system that enables the user an intuitive way of working with the system with on-air hand movement and gesture. The system can be used in a wide range of applications like puppetry, photo retouching, and video recording on augmented scene .Usability tests performed by both amateur as well as professional digital photo artists proves ease and efficiency of the tool in generating quick wonderful photo effect in multimodal environment.

대한전기학회 학술대회 논문집, Oct 1, 2013

2015 International Workshop on Antenna Technology (iWAT), 2015

In this paper, we address the telemetry and wireless powering problems associated with the recent... more In this paper, we address the telemetry and wireless powering problems associated with the recently invented leadless pacemaker. To overcome the telemetry problem, we propose a conformal spiral type Implantable antenna at Medical Implanted Communication Service (MICS) band. In addition, we also apply the recently proposed midfield wireless power transfer (WPT) technique at 1.5 GHz to avoid the bulky energy storage component. We simulate and experimentally measure the performance of the implantable antenna by using porcine heart tissue. Our research shows that, the implantable antenna and wireless power transfer scheme can be implemented in a leadless pacemaker without any significant coupling between them.

Physical review. E, Statistical, nonlinear, and soft matter physics, 2015

Using the magnetofluid unification framework, we show that the accretion disk plasma (embedded in... more Using the magnetofluid unification framework, we show that the accretion disk plasma (embedded in the background geometry of a black hole) can relax to a class of states known as the Beltrami-Bernoulli (BB) equilibria. Modeling the disk plasma as a Hall magnetohydrodynamics (MHD) system, we find that the space-time curvature can significantly alter the magnetic (velocity) decay rates as we move away from the compact object; the velocity profiles in BB states, for example, deviate substantially from the predicted corresponding geodesic velocity profiles. These departures imply a rich interplay of plasma dynamics and general relativity revealed by examining the corresponding Bernoulli condition representing "homogeneity" of total energy. The relaxed states have their origin in the constraints provided by the two helicity invariants of Hall MHD. These helicities conspire to introduce an oscillatory length scale into the system that is strongly influenced by relativistic and t...

Digital Image Processing, 2014

Image inpainting is an image processing technique to remove unwanted objects from the images by d... more Image inpainting is an image processing technique to remove unwanted objects from the images by diffusing the pixel information from the neighborhood pixels. Image inpainting techniques are in use over a long time for various applications like removal of objects from the images, scratch removal and so on. The algorithms developed can be broadly categorized into two major classes: Structure inpainting and Texture inpainting. Structures inpainting techniques are used to remove objects or inpaint the image against a homogeneous background where as the texture inpainting techniques are used to diffuse texture map in the inpainted area. Most of the structure inpainting techniques propagate the information from the inpainting boundary into the inpainting area. Number of iterations are to be selected manually prior to the inpainting in order to avoid instability. In this work we present simple and unexplored inpainting technique which achieves better results in terms of both visual quality and analytical quality. The technique is inherently stable and converges. In this project we propose three techniques: Median Inpaiting based technique. Gaussian Pyramidal Technique. Local Binary pattern based Image Inpainting Technique. The proposed algorithm is based on propagating 1) median value, 2) Gaussian filtered values and 3) LBP values of pixels from exterior area to be inpainted into the inner area. Results show remarkable improvements in terms of PSNR over the methods proposed by Bertalmio and Roth.

IEEE Microwave and Wireless Components Letters, 2015

Physical Review D, 2015

A grand unified field M µν is constructed from Maxwell's Field tensor and appropriately modified ... more A grand unified field M µν is constructed from Maxwell's Field tensor and appropriately modified flow field, both non-minimally coupled to gravity, to analyze the dynamics of hot charged fluids in curved background space-time. With a suitable 3 + 1 decomposition, this new formalism of the hot fluid is then applied to investigate the vortical dynamics of the system. Finally, the equilibrium state for plasma with non-linear coupling through Ricci scalar R to gravity is investigated to derive a double Beltrami equation in curved space-time.

2012 International Conference on Communication, Information & Computing Technology (ICCICT), 2012

ABSTRACT In this paper we present a simple convolution encoder that is implemented over mixed sig... more ABSTRACT In this paper we present a simple convolution encoder that is implemented over mixed signals of various types of real number values. We make use of the Orthogonal Frequency Division Multiplexing (OFDM) technique for the band pass modulation methods. Here we also make use of the multiband OFDM transmitter that consists of blocks performing IFFT, interleaving, puncturing of sequences and modulation using orthogonal sequences. The main purpose of our paper is to set a basic example of working with higher error correcting codes over real number sequences directly using Fourier transforms and implement it through the noisy AWGN channel using the latest OFDM technique.[1].

2009 Fifth International Conference on Wireless Communication and Sensor Networks (WCSN), 2009

Mobile adhoc network(MANET) is a ¿on the fly¿ network of mobile nodes. Packets are routed through... more Mobile adhoc network(MANET) is a ¿on the fly¿ network of mobile nodes. Packets are routed through mobile nodes instead of any fixed base station. (AODV) is most adopted routing protocol in MANET where a path is established when a node wants to communicate with another node. The period over which the communication proceeds through this path is known as a

Thinkquest~2010, 2011

A mobile ad-hoc network (MANET) is a self configuring network of mobile routers (and associated h... more A mobile ad-hoc network (MANET) is a self configuring network of mobile routers (and associated hosts) connected by wireless links—the union of which form an arbitrary topology. The routers are free to move randomly and organize themselves arbitrarily; thus, ...

2009 First Asian Himalayas International Conference on Internet, 2009

Let F be a strongly regular graph with adjacency matrix A. Let I be the identity matrix, and J th... more Let F be a strongly regular graph with adjacency matrix A. Let I be the identity matrix, and J the all-1 matrix. Let p be a prime. Our aim is to study the prank (that is, the rank over F p , the finite field with p elements) of the matrices M = aA + bJ + cI for integral a, b, c. This note is based on van Eijl [8]. 1. The Smith normal form Let us write M ~ N for integral matrices M and N of order n, if there are integral matrices P and Q of determinant ±1 such that N = PMQ. Clearly, ĩ s an equivalence relation. Given the matrix M, we can find a diagonal matrix S(M) with S(M) ~ M and S(M) = diag (s 1 ,•••,s n) with s 1 |s 2 | •••|s n. The matrix S(M) is uniquely determined up to the signs of the S i (we might require S i > 0, but that is not always convenient), and is called the (more precisely, a) Smith normal form of M. (Thus, "S(M) = A" is to be interpreted as stating that A is a Smith normal form of M.) Clearly, P i s i = det S(M) = ±det M, and more generally P k i=1 s i is the g.c.d. of all minors of M of order k. The prank rk p (M) of M equals the number of Si not divisible by p, and the Q-rank rk(M) of M equals the number of nonzero S i. In particular, rk p M < rkM. If p e ||det M, then rk p M > n-e. SNFO. Let M be an integral matrix of order 2, and g the g.c.d. of its four elements. Then S(M) = diag (g,(detM)/g). SNF1. S(J n + cI n) = diag (1,c n-2 ,c(c + n)) for c E Z. (We use exponents to denote multiplicities.) More generally S(bJ n + cI n) = diag (g,c n-2 ,(bn + c)c/g), where g = gcd(b, c).

2009 First Asian Himalayas International Conference on Internet, 2009

CDMA is most widely used standard for multiuser system in wireless ad hoc network. CDMA standards... more CDMA is most widely used standard for multiuser system in wireless ad hoc network. CDMA standards presents set of protocols for power control, BER control and multiuser detection system in ad hoc network. Therefore behevior of MANET depends upon the modeling of CDMA based MAC layer, which also attributes to the performance of the network. In this paper we present

2010 10th International Symposium on Communications and Information Technologies, 2010

A CMOS current differencing transconductance amplifier (CDTA) with high transconductance has been... more A CMOS current differencing transconductance amplifier (CDTA) with high transconductance has been proposed. The transconductance (g m) of CDTA is generally increased either by increasing the biasing current I B or by increasing the size of transistors used in differential pair and current mirror structures. The first technique leads to higher power dissipation and limited range of transconductance while the second limits the input/output swing and bandwidth of CDTA due to higher parasitic capacitances. In the proposed design of CDTA, a cross coupled PMOS active load has been used in place of conventional PMOS active load. The cross coupled PMOS active load forms a positive feedback which results in higher transconductance, wider tuning range and less power consumption without any limitations on input/output swing and bandwidth of the CDTA. Mentor Graphics Eldo simulation tool has been used to verify the performance of proposed CDTA with TSMC 0.18 lm technology parameters. A voltage/current mode oscillator circuit of third order has been designed by proposed CDTA.

Physical Review D, 2007

The equation of state for radiation is derived in a canonical formulation of the electromagnetic ... more The equation of state for radiation is derived in a canonical formulation of the electromagnetic field. This allows one to include correction terms expected from canonical quantum gravity and to infer implications to the universe evolution in radiation dominated epochs. Corrections implied by quantum geometry can be interpreted in physically appealing ways, relating to the conformal invariance of the classical equations.

SPIE Proceedings, 2010

Signature verification is one of the most widely researched areas in document analysisand signatu... more Signature verification is one of the most widely researched areas in document analysisand signature biometric. Various methodologies have been proposed in this area foraccurate signature verification and forgery detection. In this paper we propose a uniquetwo stage model of detecting ...

2011 International Conference on Emerging Trends in Electrical and Computer Technology, 2011

... Nibedita Das (4th Author) Assistant Professor, Department of Electrical Engineering MITM, BBS... more ... Nibedita Das (4th Author) Assistant Professor, Department of Electrical Engineering MITM, BBSR,Orissa Orissa, India email: nibeditadas_2004@rediffmail.com Dr. V. Mukherjee (6th Author) Assistant Professor, Department of Electrical Engg. ...

Computers and Devices for Communication, 2021

INTERNATIONAL JOURNAL OF ADVANCED ENGINEERING AND MANAGEMENT, Sep 1, 2017

IEEE Transactions on Industrial Electronics, 2018

International Journal of Signal Processing, Image Processing and Pattern Recognition, 2016

대한전기학회 학술대회 논문집, Oct 1, 2013

2015 International Workshop on Antenna Technology (iWAT), 2015

Physical review. E, Statistical, nonlinear, and soft matter physics, 2015

Digital Image Processing, 2014

IEEE Microwave and Wireless Components Letters, 2015

Physical Review D, 2015

2012 International Conference on Communication, Information & Computing Technology (ICCICT), 2012

2009 Fifth International Conference on Wireless Communication and Sensor Networks (WCSN), 2009

Thinkquest~2010, 2011

2009 First Asian Himalayas International Conference on Internet, 2009

2010 10th International Symposium on Communications and Information Technologies, 2010

Physical Review D, 2007

SPIE Proceedings, 2010

2011 International Conference on Emerging Trends in Electrical and Computer Technology, 2011