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Articles by A. Krishnan
Total Records ( 5 ) for A. Krishnan
  A. Krishnan , P. Kamalakkannan and V. Karthikeyani
  A dynamic topology is distinguishing feature and challenge of wireless ad hoc networks. Links between the nodes are created and broken, as the node moves within the network. This node mobility affects not only the source and/or multicast receiver, as in conventional wireless network, but also intermediate nodes, due to network mutihop nature. Furthermore, the packets are more likely to be lost due to external environmental factors wireless interference if the signal strength is not strong enough. The major strength of web-structured multicast routing protocol is simplicity. This study propose an improved stability scheme to estimate link stability based on signal strength. We perform simulations to investigate the benefits and costs of using signal strength as route selection criteria. The proposed method increase total number of bytes received by the receiver and decrease the control overhead compare with the basic WSMRP.
  A. Subramani and A. Krishnan
  A general goal of the Asynchronous Transfer Mode (ATM) network is to support connections a cross Local-Area Networks (LANs), Metropolitan Area Networks (MANs) and Wide Area Networks (WANs). However, in Available Bit Rate (ABR) service, different treatments are offered according to different Round Trip Times (RTTs) of connections. To improve the above unfairness, this study presents Doubly Finite Queue mechanism and Multi Source Virtual Dynamic Routing Algorithm, in which 3 reference parameters for cell delay are defined and reflect on the messages of Resource Management (RM) cells. To evaluate our mechanism, we execute simulations on a simple ATM network model where multiple connections and background traffic with different RTTs share the bandwidth of a bottleneck link. The simulation results, based on good throughput and efficiency, clearly show that the mechanism improves the fairness among multiple connections, although the considered implementation of ABR transfer capacity is simple.
  S. Ramesh and A. Krishnan
  Power engineers have the responsibility to deliver economically, adequate and quality power to the consumers. In order to achieve this, the power system must be maintained at the desired operating level by suitable modern control strategies. The controlling of power system is becoming increasingly more complex due to large interconnections. The load frequency control is very important in power system operation and control for supplying sufficient and reliable electric power with good quality. This study deals with the application of real coded genetic algorithm for optimizing the gain of a proportional integral controller for load frequency control of interconnected power systems. Non-linearities such as Governor Dead Band (GDB) and Generation Rate Constraints (GRC) for a two-area reheat thermal power system have been included. Floating point representation has been used, since it is more consistent, more precise and leads to faster convergence. The simulation results confirm the designed control performance of the proposed controller.
  K. Sathiyasekar , K. Thyagarajah , A. Krishnan and A. Ebenezer Jeyakumar
  The condition of the insulation of an machine can be assessed by measuring the various parameters of the insulation like capacitance, leakage current, dissipation factor, polarization index, surge voltage with standing strength etc. To assess these parameters of the insulations used in high voltage rotating machines a number of measurements have been conducted on actual stator coils of machines manufactured using resin rich technology for various test voltages, the capacitance and dissipation factors were measured and correlated as a function of test voltages. Attempts were made using Neural Network tool to predict the possibilities of establishing a correlation between the applied test voltage and the maximum variation of capacitance and dissipation factor in relation to the volume of the air filled voids in the insulation.
  A. Subramani and A. Krishnan
  The ATM forum has proposed the Private Network-Network Interface (PNNI) specification to facilitate routing in ATM networks, pre-path selection (or) routing algorithms that guarantee a user’s multiple Quality of Service (QoS) requirements remain an open issue. In this study, we consider Multi-Source Virtual dynamic QoS Routing in an integrated-services environment where some of the offered traffic streams are dynamic. While there has been work on routing performance in the presence of purely stationary traffic, the presence of dynamic traffic has received very little attention. We consider here two routing schemes: Multi-Source Virutal Dynamic Routing (MSVDR), Hierarchical Based Least Loaded Routing with Periodic update (HBLLR). Based on simulation, we have found that while MSVDR performs and adapts better than Backward Hierarchal Routing Algorithm (BHRA) in the case of no trunk reservation, it is other way around when there is moderately high trunk reservation (even for less frequent routing updates). Further, we found that dynamics of a traffic class can result in dynamic flow blocking behavior even on stationary traffic, especially at a low or no trunk reservation level. This proposed Algorithm (MSVDR) reduce the Reservation Time, Minimize the Queue length, Fast route recovery, Maximum link utilization and Good throughput compare to the other Routing Algorithms.
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