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Palanisamy P.,Annai Mathammal Sheela Engineering College
International Journal of ChemTech Research | Year: 2015

This paper deals with an experimental investigation of the tube side heat transfer co-efficient in concentric tube heat exchanger with inner tube,arrangement as inserting of different porous material on the outer surface of the inner tube wall of concentric tube heat exchanger using Wilson plot analysis. The exhaust gas of twin cylinder diesel engine is used as coolant and water as heating fluid. The flow circulation develops turbulent motion which results in increase the heat transfer co-efficient values. The experimental tests are conducted on developed concentric tube heat exchanger with four different porous particles selected as cast iron, mild steel, copper and aluminum. The heat transfer co-efficient is analyzed and verified by Wilson plot method and Nusselt’s number correlations are developed. The results with Wilson plot method and the experimental results are found with good agreements. © 2015, Sphinx Knowledge House, All rights reserved.

Palanisamy P.,Annai Mathammal Sheela Engineering College
International Journal of Ambient Energy | Year: 2015

This paper aims to analyse and improve the thermal performance of a concentric tube heat exchanger using porous material inserts. In this method, two different types of porous materials such as cast iron and mild steel were introduced on the outer surface of the inner tube wall of a concentric tube exchanger. The porous particle improves the convective heat transfer co-efficient between the tube wall and fluid flow surface. Experimentally, it was found that the inserted porous material enhances the heat exchanger effectiveness by 76% for cast iron and 77% for mild steel. The effect of inserting porous particles on the waste heat recovered from the engine exhaust was also investigated in the present study. © 2015 Taylor & Francis

Saravanabhavan C.,Annai Mathammal Sheela Engineering College
European Journal of Scientific Research | Year: 2011

Conventional association rules mining cannot satisfy the demands emerging from certain real applications. By regarding the diverse values of distinct items as utilities, utility mining concentrates on discovering the itemsets with high utilities. In recent times, high utility pattern mining is one of the most significant research issues in data mining because of its ability to account for the non-binary frequency values of items in transactions and diverse profit values of each item. In this paper, we have presented an efficient tree structure for mining high utility itemsets. At first, we have developed a novel utility frequent-pattern tree structure, an extended tree structure for storing crucial information about utility itemsets. Then, we have utilized the pattern growth methodology for mining the complete set of utility patterns. Improved high utility itemsets mining efficiency is achieved using two major concepts: 1) Compressing a large database into a smaller data structure as well as the utility FP-tree avoids repeated database scans, 2) The pattern growth method utilized in our proposed FP-tree-based utility mining avoids the costly generation of a large number of candidate sets and thereby reduces the search space dramatically. Experimental analysis is carried out on our tree structure mining concept using different real life datasets. The performance evaluation results demonstrate the efficiency of our proposed approach in mining high utility itemsets. © EuroJournals Publishing, Inc. 2011.

Karthikeyan R.,Annai Mathammal Sheela Engineering College
European Journal of Scientific Research | Year: 2011

Multilevel inverters can be widely applied in industries. Different modulation techniques have been proposed to control the multilevel inverter. This paper proposes a new algorithm for hybrid multilevel inverters with unequal voltage steps under the space vector pulse width modulation (SVPWM). The SVPWM can be applied practically in hybrid multilevel inverters with different voltage steps; it can be applied to most multilevel topologies. A scheme is presented to identify the center of a subhexagon containing the reference space vector. The reference space vector is mapped to the innermost subhexagon, using the center of the subhexagon. The algorithm offers an intuitive method for minimizing the total harmonic distortion (THD) of the output voltage of the inverter and the proposed techniques lead to a significant reduction in THD. Finally, the algorithm was implemented on a Digital Signal Processor (DSP) and the scheme is explained for a five level inverter, and experimental results are presented for a five level inverter. © EuroJournals Publishing, Inc. 2011.

Bhoopathy V.,Annai Mathammal Sheela Engineering College
European Journal of Scientific Research | Year: 2011

In the existing secure data aggregation techniques, reduction in the energy consumption is not much discussed and combined solution for both integrity and authentication is not addressed. In this paper, we propose to design an Energy Efficient Secure Data Aggregation Protocol for wireless sensor networks. In this protocol, we incorporate the authentication and security to maintain the efficiency of the data aggregation. First the network is divided into clusters, each cluster is headed by an aggregator and the aggregators are connected to sink either directly or through other aggregators. The aggregator is selected based on the nearest distance to a set of sensor nodes and its energy level. Separate keys are distributed to the two levels i.e., sensor node to the aggregator and aggregator to the sink. Whenever a sensor node wants to send data to another node; first the sensor node encrypts the data using a key and sends it to the aggregator. For integrity of the data packet, a MAC based authentication code is used. Simulation results show that our proposed protocol has reduced energy consumption while attaining good packet delivery ratio.

Sivakumar P.,Annai Mathammal Sheela Engineering College
European Journal of Scientific Research | Year: 2011

By employing traditional search engines, it has become increasingly hard to explore for appropriate information, as web keeps on growing. From the content of web pages, mining of web contents aims to extort constructive information or knowledge. Different kinds of Web contents which can offer valuable information to users are available in the Web, for example multimedia data, structured (i.e. XML documents), semi-structured (i.e. HTML documents) and unstructured data (i.e. plain text). Here, only part of the information is useful for a particular application and the remaining information are noises. In this research work, we propose an approach for removing the noises from a given web page which will improve the performance of web content mining. At first, the web page information is divided into various blocks. From which, the duplicate blocks are removed using Simhash. For each block, using three parameters Keyword Redundancy, LinkwordPercentage and Titleword Relevancy; the importance of the block is calculated. Based on a predefined threshold value, the noise blocks are removed and the remaining important blocks, which are then utilized for the task of web content mining. The performance of theproposed approach is evaluated with several web pages and the results ensure the effectiveness of the proposed approach in identifying the important blocks. © EuroJournals Publishing, Inc. 2011.

Jagadeesan N.,Annai Mathammal Sheela Engineering College
Journal of Theoretical and Applied Information Technology | Year: 2014

Digital images are used everywhere and it is easy to manipulate and edit because of availability of various image processing and editing software. Resizing the image to a lower resolution can alter the appearance of an image. It is useful at times to create a downsampled version of the image that gives the same impression as the original. There are many methods for image downsampling. In this paper, an efficient thresholding technique is used for image downsampling based on Discrete Wavelet Transforms and Genetic Algorithm. We have combined Genetic Algorithm (GA) with Discrete Wavelet Transform (DWT) to make the image down sampling faster and to get adequate results. First the length of the histogram is reduced by using DWT. Using this reduced histogram, the number of thresholds and threshold value are determined by applying Genetic Algorithm. From the analysis of results, it can be concluded that the proposed method is fast and accurate. © 2005 - 2014 JATIT & LLS. All rights reserved.

Ramesh S.,Annai Mathammal Sheela Engineering College | Sathish Gandhi V.C.,Anna University | Joemax Agu M.,CSI Institute of Technology | Thanmanaselvi M.,Anna University
Structural Engineering and Mechanics | Year: 2013

A leaf spring, especially the longitudinal type is liable and persistent element in automotive suspension system. In the present scenario the composite materials are widely used in the automobile industries has shown a great interest in the replacement of steel spring due to high strength by weight ratio. Previous investigations focused on stresses and displacement analysis of single leaf spring for different materials. The present work aims to design and analysis of leaf spring for two different cases by considering the Young's modulus to yield strength ratio. In the first case the analysis deals with the design and analysis of a single cantilever solid triangle beam which is an equivalent beam of a spring with three leaves having uniform strength. In the second case a 3- beams of rectangular cross section has been considered which is equivalent to a spring with three leaves. The analysis was carried out based on contact mechanics approach. The results were compared, that the fiberglass composite leaf spring is suitable for high loading capacity, reliability and efficiency. Copyright © 2013 Techno-Press, Ltd.

Saravanabhavan C.,Annai Mathammal Sheela Engineering College
Journal of Theoretical and Applied Information Technology | Year: 2013

Data mining services require accurate input data for their results to be meaningful, but privacy concerns may influence users to provide spurious information. The problem of privacy-preserving data mining has numerous applications in homeland security, medical database mining, and customer transaction analysis. The main feature of the most PPDM algorithms is that they usually modify the database through insertion of false information or through the blocking of data values in order to hide sensitive information. In this paper, we have incorporated the privacy preserving concept into the previously developed weighted utility mining approach. In this, we have presented an efficient algorithm for mining of privacy preserving high utility item sets by considering the sensitive item sets. The algorithm comprise of three major steps to attain the aim of our research includes, 1) Data sanitization, 2) Construction of sensitive utility FP-tree and, 3) Mining of sensitive utility item sets. The experimentation has carried out using real as well as the synthetic dataset and the performance of the proposed algorithm is evaluated with the aid of the evaluation metrics such as Miss cost and Database difference ratio. © 2005 - 2013 JATIT & LLS. All rights reserved.

Murugesan M.,V S B Engineering College | Asokkumar G.,Annai Mathammal Sheela Engineering College | Ramani K.,KS Rangasamy College of Technology
Journal of Electrical Engineering | Year: 2012

In this paper, a modified hybrid multilevel inverter is introduced which employs bypass diode technique with H-bridge inverter topology. It aims to reduce number of controlled switches. The proposed inverter consists of a H-bridge and 3 unit cells. Each unit cell requires a serially connected voltage source and switch with a parallel diode. In a conventional multilevel inverter, presence of high number of switches increase the harmonics, switching losses, cost and total harmonics distortion. This proposed topology achieves fifteen level with only seven number of switches. It dramatically reduces complexity of control circuit, cost and low order harmonics and thus effectively reduces total harmonics distortion.

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