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Search Results: 1 - 10 of 191528 matches for " D. Sridharan "
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Critical Data Delivery Using TOPSIS in Wireless Body Area Networks  [PDF]
K. Suriyakrishnaan, D. Sridharan
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.76053
Abstract: Technology development in the Wireless Sensor Network (WSN) has paved the way for body area network for remote health monitoring. For this purpose, a message or a data packet should be transmitted from the patient to the medical evaluator without any loss. In this work, Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) algorithm is implemented for Wireless Body Area Networks (WBAN) to deliver the message, based on the criticality of the pa- tient. Finally, we compare the results for both the real-time data and the simulated (random) values in terms of packet-size forwarding for different parameters such as Packet Delivery Ratio (PDR), Delay and Throughput. The result shows better performance in the real time value by using TOPSIS scheme in the WBAN. By improving the quality of service in body area networks, health monitoring system can be automated with good performance.
Wireless Sensor Networks Based Control Strategies for the Enhancement of Reliability in Smart Grids  [PDF]
A. K. P. Kovendan, D. Sridharan
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.79216
Abstract: The rapid increase in the demand for electricity necessitates the power quality improvement for achieving better reliability in smart grids. Wireless Sensor Networks (WSN) is the proven technology for reliable monitoring. This paper proposes a system model for the development and implementation of WSN based communication system for the monitoring of distributed generation, loads and transmission lines in the electrical grid and a controller system for automated control on the electrical grid. This work also aims to reduce the carbon footprints by reducing the dependency of electrical grid through the enhancement of distributed generation and grid sharing for avoiding voltage rise problem. To achieve this, a smarter electrical grid has been developed for the validation of smart grid considering a generation substation, a transmission substation and a distributed generation with loads. The occurrence of power quality issue and voltage rise has been controlled by active power control strategy. The communication network and controller has been modeled and tested for the performance of monitoring system and data communication capability on smart grid.
Authors′ reply
Manayani D,Sridharan G
Indian Journal of Medical Microbiology , 2002,
Mitigating Misbehaving Node Using Receiver Network Allocation Vector
R. Kalaiarasi,D. Sridharan
International Journal of Computer and Electrical Engineering , 2013, DOI: 10.7763/ijcee.2013.v5.667
Abstract: In MANET, MAC layer uses Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA)mechanism to access the medium. This mechanism allowscontention to access the medium among the competing nodes.Misbehaving nodes may violate the IEEE 802.11 MAC protocolrules to increase their throughput at the expense of other nodes.In order to rectify this drawback, the misbehavior nodes have tobe detected to improve the network performance. Hence, theproposed work involves the detection of misbehaving nodeusing the contention window value. In addition, The RNAV (Receiver Network Allocation vector) timer is to be fixed at thereceiver side to avoid the collisions.
High resolution 2-D maps of OI 630.0 nm thermospheric dayglow from equatorial latitudes
D. Pallam Raju,R. Sridharan
Annales Geophysicae (ANGEO) , 2003,
Abstract: The first-ever high resolution 2-D maps of OI 630.0 nm dayglow obtained from equatorial latitudes clearly reveal the movement as a large-scale feature of the equatorial ionization anomaly (EIA). These also show the presence of wave-like features classified as gravity waves presumably originating at the crest of the EIA, similar to the equatorial electrojet acting as a source of these waves. These results are presented and discussed. Key words. Atmospheric composition and structure (Airglow and aurora) · Ionosphere (Equatorial ionosphere; Instruments and techniques).
Latency Optimized Data Aggregation Timing Model for Wireless Sensor Networks
A. Sivagami,K. Pavai,D. Sridharan
International Journal of Computer Science Issues , 2010,
Abstract: In Wireless Sensor Networks (WSN), the data aggregation schemes are extensively used to avoid the redundant transmission of correlated data from densely deployed sensor nodes. Even though, it enhances the network lifetime, it seriously suffers from the increased data delivery time. The high end-to-end delay experienced by the packets is not acceptable in the delay-constrained applications like seismic activity monitoring, military field monitoring, etc. In this work, we propose a novel data aggregation-timing model for node's aggregation time out to reduce the data delivery time.
High Frequency Charging Techniques—Grid Connected Power Generation Using Switched Reluctance Generator  [PDF]
S. Sridharan, S. Sudha
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.714352
Abstract: Power generation becomes the need of developed, developing and under developed countries to meet their increasing power requirements. When affordability increases their requirement of power increases, this happens when increased per capita consumption. The existing power scenario states that highest power is produced using firing of coals called thermal energy. A high efficiency Switched Reluctance Generator (SRG) based high frequency switching scheme to enhance the output for grid connectivity is designed, fabricated and evaluated. This proposed method generates the output for the low wind speed. It provides output at low speed because of multi-level DC-DC converter and storage system. It is an efficient solution for low wind power generation. The real time readings and results are discussed.
First results from ground-based daytime optical investigation of the development of the equatorial ionization anomaly
D. Pallam Raju,R. Sridharan,S. Gurubaran,R. Raghavarao
Annales Geophysicae (ANGEO) , 2003,
Abstract: A meridional scanning OI 630.0-nm dayglow photometer was operated from Ahmedabad (17.2°N dip lat.) scanning a region towards the south in the upper atmosphere extending over ~5° in latitude from 10.2°N to 15.2°N dip latitude. From the spatial and temporal variabilities of the dayglow intensity in the scanning region we show for the first time, evidence for the passage of the crest of the equatorial ionization anomaly (EIA) in the daytime by means of a ground-based optical technique. The relationship between the daytime eastward electric field over the dip equator in the same longitude zone as inferred from the equatorial electrojet strength and the evolutionary pattern of EIA is clearly demonstrated. The latter as inferred from the dayglow measurements is shown to be consistent with our present understanding of the electrodynamical processes in the equatorial region. The present results reveal the potential of this ground-based optical technique for the investigation of ionospheric/thermospheric phenomena with unprecedented spatial and temporal resolution.
Performance Analysis of Contention Window Cheating Misbehaviors in Mobile Adhoc Networks
R. Kalaiarasi,Getsy S. Sara,S. Neelavathy Pari,D. Sridharan
International Journal of Computer Science & Information Technology , 2010,
Abstract: Mobile Ad Hoc Network (MANET) is a collection of nodes that can be rapidly deployed as a multi-hop network without the aid of any centralized administration. Misbehavior is challenged by bandwidth and energy efficient medium access control and fair share of throughput. Node misbehavior plays an important role in MANET. In this survey, few of the contention window misbehavior is reviewed and compared. The contention window cheating either minimizes the active communication of the network or reduces bandwidth utilization of a particular node. The classification presented is in no case unique but summarizes the chief characteristics of many published proposals for contention window cheating. After getting insight into the different contention window misbehavior, few of the enhancements that can be done to improve the existing contention window are suggested. The purpose of this paper is to facilitate the research efforts in combining the existing solutions to offer more efficient methods to reduce contention window cheating mechanisms.
High Performance Hybrid Two Layer Router Architecture for FPGAs Using Network On Chip
P. Ezhumalai,S. Manojkumar,C. Arun,P. Sakthivel,D. Sridharan
Computer Science , 2010,
Abstract: Networks on Chip is a recent solution paradigm adopted to increase the performance of Multicore designs. The key idea is to interconnect various computation modules (IP cores) in a network fashion and transport packets simultaneously across them, thereby gaining performance. In addition to improving performance by having multiple packets in flight, NoCs also present a host of other advantages including scalability, power efficiency, and component reuse through modular design. This work focuses on design and development of high performance communication architectures for FPGAs using NoCs Once completely developed, the above methodology could be used to augment the current FPGA design flow for implementing multicore SoC applications. We design and implement an NoC framework for FPGAs, MultiClock OnChip Network for Reconfigurable Systems (MoCReS). We propose a novel microarchitecture for a hybrid two layer router that supports both packetswitched communications, across its local and directional ports, as well as, time multiplexed circuitswitched communications among the multiple IP cores directly connected to it. Results from place and route VHDL models of the advanced router architecture show an average improvement of 20.4 percent in NoC bandwidth (maximum of 24 percent compared to a traditional NoC). We parameterize the hybrid router model over the number of ports, channel width and bRAM depth and develop a library of network components (MoClib Library). For your paper to be published in the conference proceedings, you must use this document as both an instruction set and as a template into which you can type your own text. If your paper does not conform to the required format, you will be asked to fix it.
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