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Vanitha M.,Sriram Engineering College | Parvathavarthini B.,St. Josephs College
2013 IEEE International Conference on "Smart Structures and Systems", ICSSS 2013 | Year: 2013

The two ad-hoc routing protocols, Ad-hoc On demand Distance Vector (AODV) and Dynamic Source Routing (DSR) suffer a number of shortcomings. The main issues are longer path set up time in case of link failures, scalability problem because of routing overhead and etc. A combination of the two routing protocols called DOA (DSR over AODV) is used to overcome these issues. DOA is usually implemented using a model called Way Point Routing model in which the problem of position estimation errors occurs. This work enhances DOA with a new algorithm called Exponential Weighted Moving Average (EWMA) for on-line updating of nodal contact probability to minimize the possibilities of position estimation errors. In this work, new packet called Delay to Send (DTS) packets instead of NACK packets has been used in addition to RTS and CTS packets. Here DTS packets are to recover the delayed data within a certain time period instead of dropping the packet after final retransmission in case of delay due to unexpected traffic in packet delivery. A Simulation analysis is carried out to analyze the performance of DOA with EWMA compared to AODV and DSR. It proves that DOA with EWMA reduces the routing overhead by 80% and scalability problem that occurred in AODV and DSR. © 2013 IEEE. Source

Kavitha K.,k-Technology | Manikandan S.,Sriram Engineering College
International Journal of Applied Engineering Research | Year: 2015

In this paper, we propose an improved linear channel estimation algorithm using a channel shortening prefilter for OFDMA (Orthogonal Frequency Division Multiple Access) based Worldwide Interoperability for Microwave Access (WiMAX) systems. The prefilter employs the Channel Impulse Response (CIR) length estimated from channel autocorrelation. The simulation results show that the improvement of Mean Square Error (MSE) for Signal to Noise Ratio (SNR) of 10 dB with CIR length estimation is about 10 dB when compared to conventional methods. © Research India Publications. Source

Senthil Kumar B.,Anna University | Suresh K.,Sriram Engineering College
International Journal of Applied Engineering Research | Year: 2015

In this paper control of a nonlinear underactuated system is considered. The nonlinear underactuated system taken here is an rotary inverted pendulum. The regulatory and tracking control is done using pole placement technique and Linear Quadraticregulatory. Sliding Mode Control method was applied for bounded disturbance when the system is maintained in upright motion by applying bounded disturbance. © 2015 Research India Publications. Source

Chitradevi B.,Thanthai Hans Roever College | Manikandan S.,Sriram Engineering College
International Journal of Applied Engineering Research | Year: 2015

The problem of data hiding has been well studied in several methods and the application of steganography has been well known. To perform data hiding using steganography method has been used in number of situations and there are some issues of distortion and irreversible data as well as image. To overcome the issues of earlier methods, the block based continuous reversible character encoding scheme is proposed in this paper. The method starts with encoding the meta data in the first block of the image, where the size of block is decided based on the size of data to be encoded. First the method computes the size of data to be encoded in bit and computes number of blocks to be used. Then the method choose the first block with size 3×3, and each row of the pixels are used to encode different information. The first row is to store the size of data has been encoded and the next row is used to encode number of blocks being used. The third row is used to specify whether multi level encoding has been used or not. The method then splits the input data into number of characters and based on the value of multi level being used, the method encodes the data using averaging scheme. © Research India Publications. Source

Thomas F.K.,Sathyabama University | Partheeban P.,Sriram Engineering College
Proceedings of Institution of Civil Engineers: Construction Materials | Year: 2010

An experimental study on high-performance concrete made with granite powder as fine aggregate and partial replacement of cement with admixtures subjected to water curing was carried out. The percentage of granite powder added by weight was 0, 25, 50, 75 and 100% as a replacement of the sand used in concrete and cement was partially replaced with 7·5% silica fume, 10% fly ash, 10% slag and 1% superplasticiser. The water-to-binder (w/b) ratio was 0·40. The effects of curing water temperature at 26 and 32°C for 1, 7, 14, 28, 56 and 90 days on the compressive strength, split tensile strength, modulus of elasticity, drying shrinkage, hydration and water penetration of concrete were studied. The test results showed clearly that granite powder of marginal quantity, used as partial sand replacement, has beneficial effects on the compressive strength and split tensile strength, modulus of elasticity. The highest compressive strength was achieved in samples containing 25% granite powder. The overall performance revealed that granite powder can be utilised as a partial replacement of natural sand in highperformance concrete. Source

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