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Articles by T. Ravichandran
Total Records ( 6 ) for T. Ravichandran
  P. Thangavel and T. Ravichandran
  In this study, we present an Integrated Cross-layer Design Approach (IXLDA) to enable smart interactions between Transport, Network, Medium Access Control and Physical layers. This approach jointly enhances the data rate adaptation, link quality prediction, routing mechanism and congestion control to realize significant gains in the overall performance of the network. We implant our IXLDA in AODV routing protocol and the new cross-layer AODV (XL-AODV) protocol is simulated using Network Simulator (NS-2). The performance of XL-AODV is compared with non-optimized traditional routing protocols based on three well-known performance metrics. The mean packet delay of the proposed algorithm is 21.86% lesser than basic AODV and 8.10% lesser than M-AODV. Indeed, the average throughput improvement of XL-AODV is about 26.67% higher than basic AODV and 17.70% higher than M-AODV. The substantial improvement in the Packet Delivery Ratio (PDR) achieved by XL-AODV is 8.80% compared to AODV and about 3.32% compared to M-AODV.
  S. Mohanasundaram and T. Ravichandran
  The establishment of Quality of Service (QoS) guarantees as required by applications through conventional routing protocols is a challenging endeavor in MANET due to its dynamic topology, lack of load balancing capabilities, limited power supply and a deficiency of unified authority. Hence, it is essential to have an efficient routing algorithm to satisfy a set of QoS constraints in spite of network dynamics. In this research, we afford a new improvement in AODV routing protocol to deliver QoS guarantees for hard real time applications in MANET. Conventional AODV routing protocol uses priority-only-based packet scheduling to arrange the packets in its queue. Existing scheduling algorithms in AODV are not efficient enough to provide QoS for hard real time packets in uncertain and dynamic environments because these approaches assume that the network is deterministic and predefined decisions will be statically implemented during scheduling. To tackle this problem, we present an interval number theory to explore the network dynamics and an argency aware architecture for packet scheduling to enhance the service demands. According to our architecture, we develop a novel Urgency aware Packet Scheduling (UaPS) algorithm and priority based buffer management policy for real time packets. We perform extensive experiments in order to examine the efficiency of the UaPS-AODV in the NS-2.34 (Network Simulator) and compare with basic AODV and Delay aware AODV (AODV-D) protocols. Our results reveal that the UaPS-AODV outperforms those existing algorithms in terms of performance metrics.
  K. Mathan , T. Ravichandran , D. Mahesh Kumar and R. Kannusamy
  In order to shield memories against MCUs (Multiple Cell Upset) as SEUs (Single Event Upset) an advanced fault detecting and correcting codes called Low Density Parity Check (LDPC) codes is devised. It is found to correct one fault per word which belongs to the family of the majority logic decoding recently projected for Ternary Content Addressable Memory (TCAM) memory application and Difference Set Cyclic Codes (DSCC). ML (Majority Logic) decodable codes measure appropriate Ternary Content Addressable Memory (TCAM) applications because of their capability to correct an outsized variety of faults. The present parity check algorithm on ML decodable codes optimizes the chip area overhead. But our projected idea for fault diagnosis algorithm makes significant Ternary Content Addressable Memory (TCAM) space overhead. Compared with the prevailing technique used for scaling back the decoding time through hybrid codes, our proposed technique offers promising choice for (TCAM) applications. It will reduce extra overhead in decoding algorithms specially designed for TCAM applications which intend to enhance the error-detection and correction capabilities. HDL (Hardware Description Language), simulation and synthesis results are enclosed herewith show that the projected techniques will be expeditiously analyzed in Spartan 6 low power FPGA for analyzing parameter in terms of TCAM, timing and power.
  S. Dhanalakshmi and T. Ravichandran
  The Breast Cancer detection is performed with the help of mammogram. In the mammogram other regions of breast have been estimated with the deep sensible notations. The functions and the constraints of the cells are observed. The fibro glandular cells to be estimate for the detection of Breast Cancer. The fat conditions are notice with another hand and the ratio generous has evaluates the Breast Cancer depth.
  S. Karthik , V.P. Arunachalam and T. Ravichandran
  Problem Statement: Denial of Service/Distributed Denial of Service (DoS/DDoS) attacks deny regular, internet services from being accessed by legitimate users, either by blocking the services completely, or by disturbing it completely, so as to cause customer baulking. Approach: Several traceback schemes were available to mitigate these attacks. Directional geographical traceback8 (DGT8), directional geographical trackback scheme, with 8 directions was one of them. Having a limited set of 8 directions, DGT8 may not work for routers with more than 8 interfaces. In this study, we had proposed Multi-DGT (DGT-16), a 16 directional geographical traceback scheme having all the advantages of DGT. The 16 directions, though not having exactly equal interface, had nearly equal measures and were identified using a novel scheme of Segment Direction Ratios (SDR). Results: The scheme of DGT16 SDR in directions D1-D16 in quadrant I-IV and DGT32 SDR in directions D1-D9 in quadrant I were examined. Conclusion: The implementation of DGT16, when a packet arrives at the victim, the geographical location of the attack router can be obtained from the data in the SDR subfields, regardless of the source IP address which may be incorrect or compromised.
  T. Ravichandran and K. Durai Samy
  The Transport of Voice Over Network has been existing for a long time. Due to the bad quality of speech and absence of useful service, it has not yet been widely spread. The benefits of reduced cost and bandwidth savings of carrying voice over data network is associated with Quality of Service (QoS). Many different techniques and protocols are used to improve the quality of service in voice over data network. We review our data on the voice quality effects of background noise and the compression option of suppressing transmission during silence. Because the main problem of echo has emerged repeatedly in the VOIP environment, we review this issue in voice over data communication network is used to VAD algorithms and cepstral analysis of VOIP network performance.
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