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Singha A.K.,Calcutta Institute of Technology | Debnath U.,Bengal Engineering and Science University
International Journal of Theoretical Physics

In this paper, we have considered a model for Brans-Dicke scalar field in presence of Chaplygin gas and interaction between them. We have shown that the BD parameter ω is constant or not, the Chaplygin gas provides early deceleration and late time acceleration of the universe. The graphical representation of statefinder parameters shows the total evolution of the universe starts from radiation era to phantom model. © 2011 Springer Science+Business Media, LLC. Source

Das B.K.,Calcutta Institute of Technology | Pal S.,Bengal Institute of Technology
International Journal of Multimedia and Ubiquitous Engineering

This paper presents a framework of intelligent tutorial system to incorporate adaptive learning and assess the relative performance of adaptive learning system over general classroom learning. In conventional classroom teaching and in distance learning the students may be from different backgrounds, their need of study and goal may be different; above all their ability to learn may not be similar. So teaching style and fitting teaching material may differ from student to student. A layered architecture of an Intelligent Tutorial System [ITS] for adaptive learning is proposed that assess the requirement, goal and capability of a student and dynamically sets a path for study, the instruction materials are dynamically selected as per the student's level of understanding from a given set of instruction materials. The system monitors the student and changes the path of study automatically as per the performance. Formative and summative test are taken by the system for decision making - as to which material is best for student and for assessing student's understanding level. The system also intelligently helps the user to overcome the misconceptions, as human teacher. Experimental results show the impressive improvement of the performances of students in distance mode learning using ITS following the proposed framework. Source

Dhar P.,Calcutta Institute of Technology | Chakraborty N.,Jadavpur University
2015 IEEE Power, Communication and Information Technology Conference, PCITC 2015 - Proceedings

Optimal reactive power management is very important due to its ability of maintaining the voltage level and system security of a power system. An accurate and feasible method for the pricing of reactive power is essential for a competitive market scenario. In this paper a method for the pricing of reactive power is formulated considering the generation from synchronous generators and shunt capacitors present in the system. Minimization of total reactive power generation cost of the system is considered to be the objective function of the problem formulated in this paper. The pricing method for generated reactive power from shunt capacitors is based on the locational marginal price (LMP) of the bus. The output of the shunt capacitors are regulated depending on their LMP throughout the day. The method is implemented on a standard IEEE 30 bus test system. Cuckoo Search algorithm is used for the optimization process. The total cost of reactive power generation is found to be $2308.36 for a typical day having variable loads throughout the 24 hour of operation. © 2015 IEEE. Source

Maity G.K.,Calcutta Institute of Technology | Roy J.N.,National Institute of Technology Agartala | Maity S.P.,Bengal Engineering and Science University
Communications in Computer and Information Science

Conservative and reversible logic gates are widely known to be compatible with revolutionary computing paradigms such as low-power CMOS, nanotechnology, optical and quantum computing. A conservative reversible logic gate is the Peres Gate (PG). This gate is also known as New Toffoli Gate (NTG), combining Toffloi Gate and Feynman Gate. This paper presents an optical circuit for realization of Peres Gate in all-optical domain. Semiconductor optical amplifier (SOA) based Mach-Zehnder interferometer (MZI) can play a significant role in this field of ultra fast all optical signal processing. © 2011 Springer-Verlag. Source

Bandyopadhyay P.K.,Calcutta Institute of Technology | Sarkar S.N.,University of Calcutta
Optical Engineering

In this paper, we approximate the fundamental mode in single mode step and graded index optical fiber by a single parameter Lorentzian function within scalar variational framework. We show that it works in a low V region, a region important for evanescent wave coupling, more accurately in terms of propagation constant in comparison to single parameter Gaussian for linear and nonlinear fibers. Furthermore, we show that the low V variations of normalized propagation constant b(V), group delay d(V), and waveguide dispersion g(V) with V based on Lorentzian approximation match more accurately with the results for linear optical fiber in comparison to Gaussian approximation in the low V region. © 2011 Society of Photo-Optical Instrumentation Engineers (SPIE). Source

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