Informatics Publishing Limited

M. Vidhyalakshmi ¹, G. Vennila ¹

Affiliations
1 Department of Computer Science and Engineering, Jayaram College of Engineering and Technology, Trichy, Tamil Nadu, IN

Abstract

The objective of this paper is to analyze the unsteady magneto hydrodynamic flow of a viscous incompressible fluid past an infinite hot vertical porous plate in presence of constant suction and periodic variation of plate temperature. The governing equations of the flow field are solved employing multiparameter perturbation technique assuming Eckert number as perturbation parameter. The effects of magnetic parameter M, Grashof number for heat transfer Gr, Eckert number Ec, Prandtl number Pr, frequency parameter ω, etc. on velocity, temperature, skin friction and heat flux are discussed with the help of figures and tables. It is observed that a growing magnetic parameter enhances the velocity of the flow field near the plate and there after the effect reverses due to the magnetic pull of the Lorentz force on the flow field. The Grash of number/permeability parameter/Eckert number has an accelerating effect on the velocity of the flow field. A growing Prandtl number / Reynolds number has a retarding effect on the temperature of the flow field at all points. The permeability parameter enhances the ski n friction and decreases the magnitude of heat flux at the wall. On the other hand, the magnetic parameter enhances the skin friction as well as the magnitude of heat flux at the wall.

Keywords

Contourlet Transform, Maximum Likelihood Detector, Multiplicative Image Watermarking

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N. Manickasankari ¹, D. Arivazhagan ¹, G. Vennila ¹

Affiliations
1 Department of Information Technology, AMET University, Chennai, IN

Abstract

A mobile computing device connected through wireless network then it is called as mobile database. The main objective of this paper proposes a survey on mobile database requirements, architecture of Mobile database Query processing, and its various challenges. Data-driven application is best method of enabling access to any kind of information retrieval from anywhere at any time. In Database query processing linear search, index based search algorithms are mainly used. This survey shows various existing algorithm used in mobile database query processing like CNFS, Flooding algorithm and their issues.

Keywords

Architecture, CNFS, Database, Data-driven, Query Processing

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N. Manickasankari ¹, D. Arivazhagan ¹, G. Vennila ¹

Affiliations
1 Department of Information Technology, AMET University, Chennai, IN

Abstract

The rapid advanced development of mobile phone usage has been increased very sharply. A semantic web is major concept about creation of Meta data. Most of the web page oriented application like HTML and XML uses the concept of Meta data. This paper proposes class concept hierarchy method for implementing and retrieving information about e-learning domain through PROTÉGÉ tools and also shows RDFS and OWL based samples method implementation for e-learning domains in these tools. It produced the result like number of course material prepared by tutor, total number of student registration and number of exam, quiz, assignment conducted by particular tutor using SPARQL query language.

Keywords

No Keywords

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G. Vennila ¹, D. Arivazhagan ¹

Affiliations
1 Department of Information Technology, AMET University, Chennai - 603112, IN

Abstract

Mobile Ad-hoc NETwork (MANET) is a collection of mobile nodes that communicate with other node without any defined network. The node which decline to share its resource with other nodes is a selfish node. The main idea of selfish node is to drop the data packets and preserve the resource for its own use. The co-operation between the nodes is not guaranteed when the node behaves as selfish nodes. Most of the existing techniques use cryptographic algorithm such as Message Authentication Code (MAC), Rivest Shamir Adelman (RSA) etc, in identifying the selfish node. All of those techniques are take more time to find out the selfish node behavior. This paper applies hash function to identify the misbehaving node. The Hash function is a technique used in the Route Reply (RREP) to authenticate the message, which works in an efficient way. The result shows the better performance in terms of packet delivery ratio up to 70% and time delay has been reduced up to 80% compared to the existing Dynamic Source Routing (DSR) protocol.

Keywords

Hash Function, Mobile Ad-hoc Network, Rrep, Rreq, Selfish Node.

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G. Vennila ¹, T. Subramani ², L. Elango ³

Affiliations
1 Deptt. of Civil Engineering, K. S. Rangasamy College of Technology, Tiruchengode-637 215, T. N., IN
2 Department of Civil Engineering, Government College of Engineering, Salem-636 011, T.N., IN
3 Department of Geology, Anna University, Chennai-600 025, T.N., IN

Abstract

A detailed GIS based study on hydrochemistry of groundwater in Vattamalaikarai Basin, Tamil Nadu, India has been carried out to assess the quality of groundwater for determining its suitability for drinking purpose. Further, the spatial variation of various groundwater quality parameters over the basin has also been studied for January 2008. The area is underlained by crystalline rocks of peninsular gneissic complex, comprising of hornblende-biotite-gneiss and charnokite. Black, alluvial, and calcareous soils are major soil types in this region. Fifty nine groundwater samples spread over the basin have been collected from open and tube wells during January 2008. The physicochemical parameters have been compared with the standard guideline values as recommended by the WHO for drinking and public health. The abundance of major ions in groundwater is in the following order: Na⁺ > Mg²⁺ > Ca²⁺ > K⁺ = Cl^- > SO₄^2- > HCO₃^- > NO₃^- > CO₃^2-. TDS widely varied from 124 to 4270 mg/L with an average value of 1422 mg/L, and at 24 locations it exceeds the maximum allowable limit of 1500 mg/L leading to unsuitability of groundwater in nearly 40% of the total basin area. TDS exhibits good positive correlation with Na⁺, Mg²⁺ and Cl^-. Groundwater of the basin belongs to hard to very hard water category since the total hardness (TH) exceeds the permissible limit of 500 mg/L prescribed for drinking water. Nitrate concentration in groundwater also widely varies from 0 mg/l to 647 mg/L with an average value of 125 mg/L. Forty four well samples out of 59 exceed the maximum allowable limit of 45 mg/L (60% of the total basin area). Fluoride is also high (> 1.5 mg/L) in groundwater at 17 locations, which may cause dental fluorosis.

Keywords

Vattamalaikarai Basin, Groundwater Quality, Hydrochemistry, Drinking Water, Spatial Variation, GIS.

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