Harinarayanan Balakrishnan

Learn More
In recent advances, many routing protocols have been proposed based on heterogeneity with main research goals such as achieving the energy efficiency, lifetime, deployment of nodes, fault tolerance, latency, in short high reliability and robustness. In this paper, we have proposed an energy efficient cluster head scheme, for heterogeneous wireless sensor(More)
A wireless sensor network is a resource constraint network, in which all sensor nodes have limited resources. In order to save resources and energy, data must be aggregated, and avoid amounts of traffic in the network. The aim of data aggregation is that eliminates redundant data transmission and enhances the life time of energy in wireless sensor network.(More)
Preserving the consumed energy of each node for increasing the network lifetime is an important goal that must be considered when developing a routing protocol for wireless sensor networks. The main objective of cluster-based routing protocol is to efficiently maintain the energy consumption of sensor nodes by involving them in multi-hop communication(More)
In Wireless sensor networks, several routing protocols have been developed to improve the various parameters such as stability period, throughput etc . After a homogenous protocol leach, many heterogeneous protocol were developed which successfully improved the routing in WSNs . In this Paper we studied one of the heterogeneous protocol DEEC and its(More)
Alkaline xylanases from alkaliphilic Bacillus strains NCL (87-6-10) and Sam III were compared with the commercial xylanases Pulpzyme HC and Biopulp for their compatibility with detergents and proteases for laundry applications. Among the four xylanases evaluated, the enzyme from the alkaliphilic Bacillus strain NCL (87-6-10) was the most compatible. The(More)
The proteolytic activity of an alkalophilic Bacillus sp. (NCL 87-6-10) correlates with xylanase secretion. Addition of DL-norvaline, glycine or Casamino acids to a medium formulated for xylanase production resulted in 2-5-fold enhancement of xylanase secretion (8 to 45 IU/ml). Inhibition of proteolytic activity is a possible mechanism for enhanced xylanase(More)
This paper describes a methodology for aiding the learning of troubleshooting tasks in the course of an engineer's work. The approach supports learning in the context of actual, on-the-job troubleshooting and, in addition, supports performance of the troubleshooting task in tandem. This approach has been implemented in a computer tool called WALTS(More)
The use of wireless sensor networks has grown tremendously in the last decade, wireless sensor networks are used in wide variety of applications. Nodes in WSN have limited battery lifetime that affects the performance of the network. Scalability is also a major concern. The use of clustering in WSN provides a solution to this. Many improvements have been(More)
With the drastic growth of Internet and VLSI design, applications of WSNs are increasing tremendously that ranges from environmental monitoring, habitat monitoring, traffic surveillance to battle fields. In WSN a number of tiny sensor nodes managed by small batteries are deployed in a hostile environment to monitor the physical parameters. During(More)
Wireless sensor network made up of sensor nodes which are fix or mobile. LEACH is clustered based protocol uses time division multiple access. It supports mobile nodes in WSN. Mobile node changes cluster. LEACH wait for two TDMA cycles to update the cluster, within these two cycles mobile node which changed cluster head, can't send data to any other(More)