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Rahaman F.,Jadavpur University | Kuhfittig P.K.F.,Milwaukee School of Engineering | Bhui B.C.,Meghnad Saha Institute of Technology | Rahaman M.,Meghnad Saha Institute of Technology | Mondal U.F.,Behala College
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2013

In this paper, a Bañados-Teitelboim-Zanelli (BTZ) black hole is constructed from an exact solution of the Einstein field equations in a (2+1) - dimensional anti - de Sitter spacetime in the context of noncommutative geometry. The BTZ black hole turns out to have either two horizons, no horizon, or a single horizon corresponding to a minimal mass. Certain thermodynamical properties are investigated, including Hawking temperature, entropy, and heat capacity. Also discussed is the geodesic structure of BTZ black holes for both massless and massive particles. In particular, it is shown that bound orbits for test particles are possible. © 2013 American Physical Society.

Rahaman F.,Jadavpur University | Salucci P.,International School for Advanced Studies | Salucci P.,National Institute of Nuclear Physics, Italy | Kuhfittig P.K.F.,Milwaukee School of Engineering | Rahaman M.,Meghnad Saha Institute of Technology
Annals of Physics | Year: 2014

An earlier study (Rahaman, etal., 2014 and Kuhfittig, 2014) has demonstrated the possible existence of wormholes in the outer regions of the galactic halo, based on the Navarro-Frenk-White (NFW) density profile. This paper uses the Universal Rotation Curve (URC) dark matter model to obtain analogous results for the central parts of the halo. This result is an important compliment to the earlier result, thereby confirming the possible existence of wormholes in most of the spiral galaxies. © 2014 Elsevier Inc.

Maulik R.,Meghnad Saha Institute of Technology | Chaki N.,University of Calcutta
2010 International Conference on Computer Information Systems and Industrial Management Applications, CISIM 2010 | Year: 2010

As MANETs use wireless medium for communication, these are vulnerable to many security attacks. In this paper a comprehensive review is done on the very recent state of the art research results on wormhole attacks and relevant mitigation measures. 100% of the works reviewed here are published in last five years, out of which 80% are published in last three years. The simulation results in NS2 helps to quantify the comparative performances of the different solutions proposed. ©2010 IEEE.

Das D.,Meghnad Saha Institute of Technology | Maitra A.,University of Calcutta
International Journal of Satellite Communications and Networking | Year: 2012

A channel model is proposed to predict the time series of Ku band rain attenuation during a rain event at a tropical location. The model is based on considering the Gaussian distribution of the conditional occurrence of rain attenuation with a particular value of the attenuation occurring before. The mean (μ) and standard deviation (σ) for the distribution are modeled with the experimental data. The measured attenuation at a particular time instant is used to obtain μ and σ and to predict the attenuation after certain interval. The channel model has tested well giving the predicted attenuation that agrees with the measured value with a mean error within 15% higher than 1 dB. Validity of the model is also tested with the first-order and second-order statistics of attenuation occurrence, on a long-term basis. The method can also be applied even if attenuation measurements are missing for certain period of time with increased error. © 2011 John Wiley & Sons, Ltd.

Das D.,Meghnad Saha Institute of Technology | Maitra A.,University of Calcutta
IET Microwaves, Antennas and Propagation | Year: 2012

A new model is proposed to predict rain rate series during a rain event at a tropical location. The model is based on Gaussian distribution of conditional occurrence of rain rate with a particular value of the rain occurring earlier. The mean and standard deviation of the distribution are modelled with the measured data. The rain rate at a particular time instant is predicted from the knowledge of previous samples. The predictor has tested well with a maximum mean error within 20%. This model produces predicted rain rate series whose first and second-order statistics fit very accurately with those of the experimental data. The method can also be applied with increased error, even if rain rate measurements are missing for certain periods of time. Comparisons with other models are also shown. © The Institution of Engineering and Technology 2012.

Sarkar A.,Kalyani Goverenment Engineering College | Kumar Das A.,Kalyani Goverenment Engineering College | De S.,Meghnad Saha Institute of Technology | Kumar Sarkar C.,Jadavpur University
Microelectronics Journal | Year: 2012

This work uncovers the potential benefit of fully-depleted short-channel triple-material double-gate (TM-DG) SOI MOSFET in the context of RF and analog performance characteristics. A systematic, quantitative investigation of the analog and RF performance figures-of-merits (FOMs) of TM-DG MOSFET are presented. The key idea in this paper is to demonstrate the improved RF, analog and linearity performance exhibited by TM-DG MOSFET over dual-material dual-gate (DM-DG) and conventional single-material double-gate (SM-DG) MOSFET. Using two-dimensional (2-D) device simulations, we have examined various design issues and provided the reasons for the improved performance. The effect of different length ratios of three channel regions related to three different gate materials of TM-DG structure on the RF and analog performance have also been discussed. Simulations reveal an improvement of intrinsic gain by 20.41% and 38.53%, an increase of 14.23% and 26.4% in the case of f T, an increase of 13.9% and 23.85% in the case of f max values for TM-DG (1:2:3) MOSFET compared to DM-DG and SM-DG MOSFET respectively. As a result, we demonstrate that TM-DG MOSFET can be a viable option to enhance the performance of SOI technology for high-frequency analog applications. © 2012 Elsevier Ltd.

Sarkar A.,Kalyani Government Engg College | De S.,Meghnad Saha Institute of Technology | Dey A.,Kalyani Government Engg College | Sarkar C.K.,Jadavpur University
Journal of Computational Electronics | Year: 2012

We report a systematic, quantitative investigation of analog and RF performance of cylindrical surroundinggate (SRG) silicon MOSFET. To derive the model, a pseudotwo- dimensional (2-D) approach applying Gauss's law in the channel region is extended for the cylindrical SRG MOSFET. Based on surface potential approach, expressions of drain current and differential capacitances are obtained analytically. Analog/RF figures of merit of SRG MOSFET are studied, including transconductance efficiency g m/I d, intrinsic gain, output resistance, cutoff frequency f T, maximum oscillation frequency f max and gain bandwidth product GBW. The trends related to their variations along the downscaling of dimension are provided. In order to validate our model, the modeled predictions have been extensively compared with the simulated characteristics obtained from the ATLAS device simulator and a nice agreement is observed with a wide range of geometrical parameters. © Springer Science+Business Media LLC 2012.

Maity B.K.,Meghnad Saha Institute of Technology | Hatua S.R.,Rabindra Bharati University
Scientometrics | Year: 2015

Like all other discipline Library and Information Science also gives emphasis on research in doctoral level. Since the first doctoral degree in 1957 it grows slowly and gets acceleration after IT revolution in India during 1990s. Based on INDCAT, Vidyanidhi, INFLIBNET and University News databases it has been found 1058 doctoral thesis have been submitted in various universities in India during 1950–2012. Present study is an attempt to find out the research trends of library management in Library and Information Science and quantitatively analyze the research activity in India based on doctoral thesis which has been already awarded in the period of 1950–2012. This work analysed 1058 PhD thesis awarded various universities in India during last 63 years, based on INDCAT database, Vidyanidhi and INFLIBNET databases and University News data. © 2015, Akadémiai Kiadó, Budapest, Hungary.

Das D.,Meghnad Saha Institute of Technology | Das D.,Bengal Engineering and Science University | Rahaman H.,Bengal Engineering and Science University
IEEE Transactions on Nanotechnology | Year: 2011

This paper analyses the crosstalk effects in carbon nanotube (CNT) interconnect, and its impact on the gate oxide reliability. Using the existing models of CNT, circuit parameters for the single-wall CNT-bundle and multiwall CNT interconnects are calculated and the equivalent circuit has been developed to perform the crosstalk analysis. The crosstalk-induced overshoot/undershoots have been estimated and the impact of the overshoot/undershoots on the gate oxide reliability in terms of failure-in-time rate is calculated. A similar analysis is performed for Cu-based interconnects and comparisons are made with the results obtained for CNT-based interconnect. It has been found that the CNT-based interconnect is more suitable in VLSI circuits as far as the gate oxide reliability is concerned. © 2011 IEEE.

Sahoo S.,Meghnad Saha Institute of Technology
Advances in Acoustics and Vibration | Year: 2011

Use of laminated composites in civil engineering structural components including shell roofs is increasing day by day due to their light weight, high specific strength, and stiffness properties. In the present paper, laminated composite hypar shell (hyperbolic paraboloidal shells bounded by straight edges) roofs with cutouts are analyzed for their free vibration characteristics using finite element method. An eight-noded curved shell element is used for modeling the shell. Specific numerical problems of earlier investigators are solved to compare their results with the present formulation. A number of problems are further solved where the size of the cutouts and their positions with respect to the shell centre are varied for different edge constraints. The results are furnished in the form of figures and tables. The results are examined thoroughly to arrive at some meaningful conclusions useful to designers. Copyright © 2011 Sarmila Sahoo.

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