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Articles by P. Narayanasamy
Total Records ( 4 ) for P. Narayanasamy
  Komathy, K. and P. Narayanasamy
  The primary objective of the paper is to augment the efficiency of signature process in Elliptic Curve Digital Signature Algorithm(ECDSA), which turns out to be a bottleneck in mobile devices due to its heavy consumption of resources. An improved algorithm for strengthening the speed of verification process in ECDSA is proposed and evaluated. Also the recent research studies have demonstrated collision attacks on popularly used hash functions, including the widely deployed MD5 and SHA-1 algorithms. To overcome this threat, this paper attempts to present a few novel solutions to reinforce the ECDSA signature against such attacks. Several simple and efficient message pre-processing techniques have been suggested, which can be combined with SHA-1 so that applications are no longer vulnerable to the known collision attacks. A detailed analysis on the results of implementation of these techniques has also been presented.
  M. Sugumaran , K.S. Easwarakumar and P. Narayanasamy
  Meeting scheduling is generally considered as one of the most common activities that takes place in organizations. The basic problem in meeting scheduling is to find a common free time for all participants of a particular meeting. It is an important activity in many organizations as most of the office workers spend much of their times in meeting scheduling. It is a time-consuming, iterative and tedious task. There exists several solutions in the literature for centralized calendar management and meeting scheduling, but they are of limited success. In this paper, we propose a new approach based on A-algorithm using heuristic function for meeting scheduling, which is performs effectively even in the case of larger problem instances than the existing algorithm.
  V. Mariappan and P. Narayanasamy
  One of the most exciting new services anticipated in 3G Universal Mobile Telecommunication Network (UMTS) is QoS enabled media streaming. Providing peer-to-peer QoS support is one of the most challenging problems towards the system integration of 3G UMTS networks. Variation in network and system conditions can dramatically affect real time media streaming services. The present study presents Policy Based QoS (PBQoS) architecture to provide QoS enabled media streaming services for all-IP packet switched 3G networks. This architecture introduces a direct one-to-one and one-to-many media streaming service in the cellular network by extending Session Description Protocol (SDP) and the XML Configuration Access Protocol (XCAP) for call and QoS management. This architecture brings new business opportunities in the domain of media streaming in 3G.
  Purusottam Mohapatra , Jobichen Chacko and P. Narayanasamy
  Studies on Diamondback moth (DBM), Plutella xylostella (L.) population gathered from eight different locations in India revealed significant variations existing among them. The tenure of life cycle of all the eight ecotypes varied from each other ranging from 20.1±1.3 to 20.9±1.01 days, longevity of adult males and females also differed. The other biological traits like egg hatchability (Varying from 83.2±7.96-91.2±4.68) and fecundity of female (Between 268.5±10.59-305.11±12.11) differed among the DBM population.
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