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Articles by R. Senthil Kumar
Total Records ( 4 ) for R. Senthil Kumar
  R. Senthil Kumar , Jovitha Jerome and S. Nithya Bhama
  A Three phase inverter with a neutral connection i.e., three phase four wire inverter is proposed. The UPS system is fed by three phase four wire inverter and the load neutral point voltage is low to meet the requirement of the system. The four leg inverters effectively provide the neutral connection in three phase four wire system. They are used in many applications to handle the neutral current caused by the unbalanced and non-linear load. The unbalanced load becomes non-linear where the neutral of the loads are accessible. The four leg inverter produces the three output voltages independently with one additional leg. The main feature of a three phase inverter with an additional neutral leg is its ability to deal with load unbalance in a system. The goal of the three phase four leg inverter is to maintain the desired sinusoidal output voltage waveform for all loading conditions and transients. The neutral connection is present to handle the ground current due to unbalanced loads. The feasibility of the proposed modulation technique is verified by Matlab/Simulink.
  J.K. Sridhar , R. Senthil Kumar and S. Arun Kumar
  The recent growth, popularity and extensive need for the deployment of group oriented applications like multiparty video conferencing, multiplayer online gaming and real time push based delivery systems has triggered the demand for secure group communication. These applications require multicast to minimize the volume of network traffic they generate. Multiparty communications have recently become the focus of new developments in the area of applications. The goal of this study is to establish a secure group communication using multicast key distribution scheme. In general, to meet forward secrecy and backward secrecy, any change in the group membership will induce group rekeying. Here, a novel key management scheme is proposed in which no redistribution of group key (shared key) is required during the group dynamics there by reducing computation and communication complexities considerably.
  R. Senthil Kumar and C. Ramesh
  Bad weather, consisting of thunderstorms, normally causes the presence of strong winds and heavy rain that may develop into a storm over a certain area. Radar has been the most potential and powerful instrument used to detect and monitor the development of thunderstorms over a large area, however, it also has certain weaknesses. Weather radar can be affected by different sources of errors which have to be well considered and quantified for a proper interpretation of the collected data. We design a method that combines the Kalman filter with a multivariate analysis technique. The implementation of this technique is for the purpose of developing a formulation that may help to reduce error. These studies involved parameters such as temperature, humidity, point of gauge rainfall and weather radar reflectivity. The approach of using the Kalman filter combined with multivariate analysis is still a new way to improve radar rainfall estimates by prediction (time update) and correction (measurement update). This particular research was developed purposefully to reduce radar rainfall bias due to the uncertain sources of error seen in the weather radar and many studies have been developed but still did not achieve suitable values between radar readings with rain gauge returns.
  N. Subramanian , C. Jothimanivannan , R. Senthil Kumar and S. Kameshwaran
  Background: Anxiety is associated with diverse range of psychiatric conditions. Justicia gendarussa Burm. (Acanthaceae) has been traditionally used for the treatment of various ailments such as rheumatism, inflammation, nerve diseases, lumbago and chorea. Despite a long tradition of use, no systematic phytochemical and pharmacological work has been carried out on this potential plant. Objective: Thus, Justicia gendarussa Burm was subjected to preliminary anti-anxiety screening studies, with a view to ascertain the verity of its traditional use as an anxiolytic. Materials and method: In the present investigation the aerial parts of plant parts were extracted with ethanol. The plant extract (EJG) at the dose of 250 and 500 mg kg-1 were evaluated for anti-anxiety screening studies, with a view to ascertain the verity of its traditional use as an anxiolytic. EJG administered orally in two different doses of 250 and 500 mg kg-1, was able to increase the time spent and the number of arm entries in the open arms of the elevated plus-maze, also increases the time spent by mice in the illuminated side of the light-dark test, as well as caused significant reduction in freezing time in comparison with control animals. This effect was comparable to that of the benzodiazepine diazepam at the dose of 2.0 mg kg-1. Conclusion: These results indicate that ethanolic extract of Justicia gendarussa Burm has an effective anti-anxiety effect.
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