Mandal S.,Bp Poddar Institute Of Management And Technology |
Ghosh A.,University of Calcutta
Optik | Year: 2012
We study the intensity point spread function (IPSF) of a uniaxial birefringent lens sandwiched between two linear polarizers under broadband illumination having flat-top spectral profile. The optic axis of the birefringent crystal is perpendicular to the lens axis. For monochromatic input illumination, a low-power birefringent lens offers enhanced resolution under parallel-polarizers configuration and apodization under crossed-polarizers configuration with a single focus as well. At a relatively high value of birefringence parameter, the proposed system behaves as a double-focus lens. The present communication uses a novel technique to study the effect of polychromatic illumination on the imaging characteristics of birefringent lenses. The studies reveal that the imaging characteristics of the low-power birefrigent lens does not deteriorate considerably under polychromatic illumination. However, for a polychromatic beam with large bandwidth, the imaging behavior of the system having high birefringence parameter deviates appreciably from that under strictly monochromatic illumination. The said system even loses its inherent bi-focal nature due to depolarization of polarized polychromatic light upon passage through the birefringent crystal. © 2011 Elsevier GmbH.
Sanyal N.,Bp Poddar Institute Of Management And Technology |
Chatterjee A.,Jadavpur University |
Munshi S.,Jadavpur University
Expert Systems with Applications | Year: 2011
In this paper an Adaptive Bacterial Foraging is proposed for fuzzy entropy optimization when it is applied to the segmentation of gray images. The proposed algorithm represents the improved version of classical bacterial foraging algorithm which is a newly developed stochastic optimization tool. This optimization technique is applied for optimization of the fitness function which is fuzzy entropy. Classical bacterial foraging algorithm is improved by adaptively selecting the exploitation and exploration state in chemotaxis of E.coli. bacteria. The newly developed algorithm is applied on benchmark gray images and proved to be suitable for thresholding based image segmentation. © 2011 Elsevier Ltd. All rights reserved.
Saha P.,Bp Poddar Institute Of Management And Technology |
Saha D.C.,Prabhu Jagatbandhu College |
Ray A.,Jadavpur University |
Chowdhury A.R.,Jadavpur University
European Physical Journal: Special Topics | Year: 2015
Effects of memristor on non-linear dynamical systems exhibiting chaos are analysed both form the view point of theory and experiment. It is observed that the memristive system has always fewer number of fixed points than the original one. Sometimes there is no fixed point in the memristive system. But its chaotic properties are retained. As such we have a situation known as hidden attractor because if it is a stable fixed point then the attractor does not evolve from its basin of attraction(obtained from its stable fixed point) or if there is no fixed point, the question of basin of attraction from fixed point does not arise at all [1, 2]. Our analysis gives a detailed accounts of properties related to its chaotic behavior. Important observations are also obtained with the help of electronic circuits to support the numerical simulations. © 2015, EDP Sciences and Springer.
Haldar R.,Bp Poddar Institute Of Management And Technology |
Mukhopadhyay D.,Calcutta Business School
Journal of Convergence Information Technology | Year: 2010
Computer Science departmental Web pages of universities usually portray the gist of their academic activities, with special emphasis on fields of research, faculty strength with their respective specialties and research labs. By text mining the departmental Web pages and individual faculty Web pages, we can get a better idea of the actual strengths and weaknesses of the specific department. This strength or weakness is quantified by performing frequency analysis of technical words of specific subcategory in the Web pages. Consequently, by analyzing the ratio of a category of technical words in the departmental Web page to the faculty Web pages, we can get an idea if the departmental claims are matched by the faculty Web pages. For this particular objective, frequency analysis came out to be a better technique than clustering.
Gazi N.H.,St Xaviers College |
Das K.,Bp Poddar Institute Of Management And Technology
Nonlinear Analysis: Real World Applications | Year: 2010
The paper deals with the dynamical behavior of plankton population ecosystem, mainly found in Sunderban mangrove area. The ecosystem is represented by a set of two dimensional non-linear differential equations involving zooplankton-phytoplankton population. Plankton populations undergo dramatic changes in marine ecology. We propose a description of plankton communities as excitable systems which resemble the behavior of excitable media. The delay parameter dependency of the various 'excitable' phenomena, trigger mechanism, threshold, and slow recovery, is clear, and permits ready investigation of the influence of properties of the physical environment, including variations in nutrient fluxes, temperature or population levels. We have analyzed the stability and bifurcation of the model system with and without delay. We have shown the existence and uniqueness of limit cycles in the rapid growth of the plankton population. We also studied the model system into a stochastic one, by incorporating random fluctuations of the environment. And we study the stochastic stability of the dynamical system in mean square sense around the interior equilibrium. © 2009 Elsevier Ltd. All rights reserved.
Khan G.,Bp Poddar Institute Of Management And Technology |
Sengupta S.,Bp Poddar Institute Of Management And Technology |
Sarkar A.,National Institute of Technology Durgapur |
Debnath N.C.,Winona State University
23rd International Conference on Software Engineering and Data Engineering, SEDE 2014 | Year: 2014
Cloud computing refers to a web service model that delivers on demand based services over the network. Agent based Cloud computing technology has gained more importance recently due to the rapid increase in no of clouds and their services. Modeling and Design methodologies for agent based cloud infrastructure have not taken a shape as yet. One of the most challenging domains is to model various agent based architecture of SOA in cloud computing environment to make the SOA system modeling more reliable and robust. To support their software development process this paper deals with modeling of an abstraction layers of SaaS architecture called Enterprise Cloud Bus, using UML 2.0 to focusing on service interaction, service collaboration, service discovery, service scheduling and service dispatching. © ISCA, SEDE 2014.
Ray A.,Bp Poddar Institute Of Management And Technology |
De D.,Maulana Abul Kalam Azad University of Technology
Smart Innovation, Systems and Technologies | Year: 2014
One of the basic requirements of Wireless Sensor Network is enhanced network lifetime. Usually Multi-hop communications between sensor nodes and the sink is more energy efficient than single hop communication. However, because the cluster heads (CHs) closer to the sink are loaded with heavy relay traffic, they exhaust much faster than other CHs in the network and ultimately the whole network becomes in operational before time. In this paper we propose a LevelWise Initial Energy Assignment (LWIEA) technique for better network lifetime.For this purpose the whole sensing region is separated in to multiple hierarchical levels and level wise initial energy of sensor nodes have been calculated before real sensor deployment. Applying LWIEA, the resultant heterogeneous sensor network with level wise different initial energy can handle different energy consumption rate in different level. Simulation results show that assigning the initial energies using LWIEA technique effectively improves the network lifetime up to 79% comparedto uniform initial energy assignment strategy with respect to the parameter Full Energy Consumption (FEC) in the network. © Springer International Publishing Switzerland 2014.
Goswami R.,Bp Poddar Institute Of Management And Technology
AIP Conference Proceedings | Year: 2014
In the present work the measurement of the dc conductivity of graphite clay nanocomposite at low temperature has been undertaken. The resistivity curve can be fitted to a polynomial function with the temperature exponent varying from 0.5 - 1 for 63,50 and 40% graphite in clay. The activation energy has also been extracted for all three samples. The corresponding variation of resistivity with temperature and the variation in temperature exponent and activation energy proves that the composite behaves like a semiconductor and its semiconducting trend can be suitably modified with the change in graphite concentration. © 2014 AIP Publishing LLC.
Mandal S.,Bp Poddar Institute Of Management And Technology
Optik | Year: 2014
Polychromatic or white-light optical transfer function (OTF) is put forward as a criterion to evaluate the performance of a uniaxial birefringent lens sandwiched between two linear polarizers. The optic axis of the birefringent crystal is perpendicular to the lens axis. The results show that the same system may be adapted for both enhanced resolution and apodization just by rotating any of the polarizers included in the system even under broadband illumination. The proposed system may also be exploited for image processing applications under polychromatic input illumination. © 2013 Elsevier GmbH.
Chanda J.,Bp Poddar Institute Of Management And Technology |
Kanjilal A.,Bp Poddar Institute Of Management And Technology |
Sengupta S.,Bp Poddar Institute Of Management And Technology
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2010
UML being semi formal in nature, it lacks formal syntax and hence automated verification of design specifications cannot be done. To address this we propose a UML Compiler that takes context free grammars for UML diagrams and verifies the syntactic correctness of the individual diagrams and semantic correctness in terms of consistency verification with other diagrams. This UML-Compiler is a part of a framework, which consists of two modules. First module converts XMI format of UML diagrams, as generated by any standard tool into string format and second module (UML-Compiler) is for verification of the diagrams. This paper focuses on the second module and proposes a formal context free grammar for the two of the commonly used UML diagrams - Class diagram (depicting the static design) and sequence diagram (depicting behavioral design) and validated by using Lex and YACC. © 2010 Springer.