S.Rama Krishna

Work place: Dept. of Computer Science, S.V. University, Tirupati, A.P., India

E-mail: drsramakrishna@yahoo.com


Research Interests: Computer systems and computational processes, Computer Architecture and Organization, Computer Networks, Data Structures and Algorithms


Prof. Dr. S. Rama Krishna received the M.Sc., M.Phil., and Ph.D Degrees from S.V. University, Tirupati.  He is working in different positions in the department of Mathematics S.V. University, Tirupati.  Recently he is working as Vice-Principal and Professor, Department of Computer Science, S.V. University, Tirupati.

His research interest includes Computational Fluid Dynamics and Computer Networks and Cryptography.  He has supervised a number of M.Phil. students 10, Ph.D students 10 guided and has completed supervised one Research Project.

Author Articles
Self-organized Detection of Relationships in a Network

By P.Lokesh Kumar Reddy B.Rama Bhupal Reddy S.Rama Krishna

DOI: https://doi.org/10.5815/ijitcs.2013.02.09, Pub. Date: 8 Jan. 2013

Multistate operations within a network result in high-dimensional, multivariate temporal data, and are useful for systems, which monitor access to network entities like resources, objects, etc. Efficient self organization of such multistate network operations stored in databases with respect to relationships amongst users or between a user and a data object is an important and a challenging problem. In this work, a layer is proposed where discovered relationship patterns amongst users are classified as clusters. This information along with attributes of involved users is used to monitor and extract existing and growing relationships. The correlation is used to help generate alerts in advance due to internal user-object interactions or collaboration of internal as well as external entities. Using an experimental setup, the evolving relationships are monitored, and clustered in the database.

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A New Transmission Control Protocol for Satellite Networks

By P.Lokesh Kumar Reddy B.Rama Bhupal Reddy S.Rama Krishna

DOI: https://doi.org/10.5815/ijisa.2013.01.06, Pub. Date: 8 Dec. 2012

According to technical statistics, current TCP protocols with approximately 80% Internet applications run on perform very well on wired networks. However, due to the effects of long propagation delay, great band- width asymmetry, high sporadic Bit Error Rate (BER) and etc., TCP performance degrades obviously on the satellite communication networks. To avoid the problems, TP-S, a novel transport control protocol, is introduced for satellite IP networks. Firstly, in order to increase the increment speed of Congestion Window (cwnd) at the beginning of data transmission, the traditional Slow Start strategy is replaced by a new strategy, known as Super Start. Secondly, a new packet lost discriminated scheme based on IP packets alternately sending with different priority is used in the protocol to decouple congestion decision from errors. Thirdly, bandwidth asymmetry problem is avoided by adopting Modified NACK (M-NACK) in receiving ends, which is sent periodically. In addition, the sending strategy in routers is also modified along with other’s changes to support the protocol. Finally, the simulation experiments show that the new protocol can not only significantly enhance throughput performance, but also reduce sharply bandwidth used in the reverse path as compared with traditional TCP protocols and those protocols, which are recently proposed for satellite IP networks.

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