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Kumar A.,AMC Engineering College
International Journal of Soft Computing | Year: 2010

This study presents an influence of mutation operator in genetic algorithm for small to large network design problem. A network design problem for this study falls under the network topology category which is a minimum spanning tree with various types of constraint which makes it NP-hard problem. Mutation operator plays an important role in genetic algorithm approach. Since many researchers have tried to solve this problem for small to mid size, we have explored the use of genetic algorithm with various mutation functions with modification but without changing the nature of genetic algorithm. Various mutation functions have been developed here as per the requirement of the problem and applied with the various size of network. In this study we have tried to show that how mutation functions affects the performance of genetic algorithm and also shown that GA is an alternative solution for this NP-hard problem. © Medwell Journals, 2010. Source


Shivakumara I.S.,Yonsei University | Shivakumara I.S.,Bangalore University | Lee J.,Yonsei University | Ravisha M.,Smt Rukmini Shedthi Memorial National Government First Grade College | Gangadhara Reddy R.,AMC Engineering College
International Journal of Heat and Mass Transfer | Year: 2011

The combined effect of magnetic field dependent (MFD) viscosity and a local thermal non-equilibrium (LTNE) on the criterion for the onset of ferromagnetic convection in a ferrofluid saturated horizontal porous layer heated from below in the presence of a uniform vertical magnetic field is studied analytically using linear stability theory. A modified Darcy equation is used to describe the flow in the porous medium and a two-field model for temperature each representing the solid as well as fluid phases separately is used for energy equation. It is demonstrated that the principle of exchange of stability is valid. The results indicate that the onset of ferromagnetic convection is delayed with an increase in the MFD viscosity parameter but shows no influence on the critical wave number. Moreover, the system is found to be more stable when the magnetic forces alone are present. Asymptotic solutions for both small and large values of scaled interphase heat transfer coefficient Ht are presented and compared with those computed numerically. An excellent agreement is obtained between the asymptotic and the numerical results. Besides, the influence of magnetic and LTNE parameters on the stability characteristics of the system is also discussed. © 2011 Elsevier Ltd. All rights reserved. Source


Raghunandan G.H.,AMC Engineering College | Lakshmi B.N.,Institute of Management Sciences
Proceedings of National Conference on Innovations in Emerging Technology, NCOIET'11 | Year: 2011

Wireless Sensor Networks (WSNs) consist of small nodes with sensing, computation and wireless communications capabilities. These sensor networks interconnect a several other nodes when established in large and this opens up several technical challenges and immense application possibilities. These wireless sensor networks communicate using multi-hop wireless communications, regular ad hoc routing techniques cannot be directly applied to sensor networks domain due to the limited processing power and the finite power available to each sensor nodes hence recent advances in wireless sensor networks have developed many protocols depending on the application and network architecture and are specifically designed for sensor networks where energy awareness is an essential consideration. This paper surveys recent routing protocols for sensor networks and compares the routing protocols that are presently of increasing importance. Here three main categories of protocols, flat based, hierarchical and location based protocols are distinguished based on the way the next hop is selected on the route of a message and briefly describes the operation of a representative member from each group. Each routing protocol is described and discussed under the appropriate category. We also highlight the advantages and performance issues of each routing technique. The paper concludes with possible future research areas. © 2011 IEEE. Source


Shivakumara I.S.,Yonsei University | Shivakumara I.S.,Bangalore University | Lee J.,Yonsei University | Ravisha M.,First Grade College | Reddy R.G.,AMC Engineering College
Meccanica | Year: 2012

The simultaneous effect of local thermal nonequilibrium (LTNE) and magnetic field dependent (MFD) viscosity on thermal convective instability in a horizontal ferrofluid saturated Brinkman porous layer in the presence of a uniform vertical magnetic field is studied analytically. The results indicate that the onset of Brinkman ferroconvection is delayed with increasing MFD viscosity parameter but the critical wave number is found to be independent of this parameter. When compared to the simultaneous presence of buoyancy and magnetic forces, it is observed that the onset of Brinkman ferroconvection is delayed more when the magnetic forces alone are present. Asymptotic solutions for both small and large values of scaled inter-phase heat transfer coefficient Ht are compared with those computed numerically and good agreement is found between them. Besides, the influence of magnetic and LTNE parameters on the stability characteristics of the system is also discussed. The available results in the literature are recovered as particular cases from the present study. © Springer Science+Business Media B.V. 2011. Source


Kayarvizhy N.,AMC Engineering College | Kanmani S.,Pondicherry Engineering College
Communications in Computer and Information Science | Year: 2011

Measurement is fundamental to any engineering discipline. There is considerable evidence that object oriented design metrics can be used to make quality management decisions. This paper focuses on an empirical evaluation of object oriented metrics proposed by Chidamber and Kemerer across the two languages. Three projects in Java and two projects in C++ have been considered as input for the study. The resulting values have been analyzed to provide significant insight about the object oriented characteristics of the projects. © 2011 Springer-Verlag Berlin Heidelberg. Source

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