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Karīmnagar, India
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Lakshmi Narayan K.,VITS
International Journal of Ecology and Development | Year: 2017

This paper deals with the stability analysis of a three species ecological model with a Prey, Predator and competitor. The competitor is competing with both the Prey and predator.The predator and competitor have alternative food resources other than prey. A time delay is proposed in the interaction between the predator and the competitor. The model is characterized by system of integro- differential equations. Further equilibrium points are derived. The Global stability of the system is discussed by constructing suitable Lyapunov’s function. Finally Numerical simulation is performed to study the delay effect that can cause a switch from unstable to stable or stable to unstable leads hopf bifurcation. © 2017 by International Journal of Ecology & Development.


Padmaja P.,VITS
International Journal of Applied Engineering Research | Year: 2016

In recent years Wireless Sensor Network has become potentially most important technology. Improvisation in wireless communications and electronics paved way for the production of low-cost, low-power, multifunctional miniature devices that can be implemented in remote sensing applications. As a result of these factors, it is possible to collect the process and disseminate valuable information that has been gathered from variety of environments using a sensor network comprising a large number of intelligent sensors. A network of energy-constrained sensors deploying over a region is considered, in that each sensor monitors its surrounding area and periodically generates information. The systematic gathering and transmission of sensed data to a base station for further processing is the basic operation in such a network. Sensors have the ability to carry out in-network aggregation or fusion of data packets reroute to the base station when data gathering. In such sensor system, the lifetime is the time in which the information can be gathered from all the sensors to the base station. In data gathering, from agreed energy constraints of the sensors expanding the system lifetime is a major threat. The data aggregator node or the cluster head combine the data to the base station and the malicious attacker may attack this cluster node. The base station cannot ensure the accuracy of the aggregate data sent to it, if a cluster head is compromised. Due to the uncompromised nodes, the existing systems may send several copies of aggregate results to the base station and the power consumption at these nodes is increased. When sensors are deployed at differet locations in wider area, it is possible to compromising attacks by adversaries. false data injected in compromised sensors during data aggregation process which results in false decision making at the Base Station (BS). Simple average data aggregation process is suitable only in attacker free environment. So to filter the false data during data aggregation, induced by the attacker. For every round of data agg. regation need to observe the behavior of nodes. So that it easy to minimize an impact of attacker contribution at the final result. For secure data aggregation process along with trustworthiness estimation using Trust wEighted Secure Data Aggregation algorithm (TESDA). Data aggregation process is optimized by performing aggregation in energy efficient manner through clustering If the aggregator is compromised, then it affects entire aggregation accuracy. Hence it is necessary to propose a aggregation protocol that is resilient against compromised sensor and compromised aggregator in energy efficient and secure manner. © Research India Publications.


Arya L.D.,SGSITS | Singh P.,VITS | Titare L.S.,Government Engineering College
International Journal of Electrical Power and Energy Systems | Year: 2012

This paper presents an algorithm for anticipatory control of load bus voltages. The algorithm optimizes a set of reactive power control variables and maximizes reactive reserve available at generating buses. Voltage dependent reactive power limits have been accounted. The optimal settings of reactive power control variables have been obtained for next interval predicted loading condition. These optimized settings satisfy the operating inequality constraints in predicted load condition as well as in present base case loading conditions. A population based differential evolution strategy has been used for optimization. Results obtained have been compared with those obtained using another population based technique known as PSO. © 2011 Elsevier Ltd. All rights reserved.


Arya L.D.,SGSITS | Singh P.,VITS | Titare L.S.,Government Engineering College
International Journal of Electrical Power and Energy Systems | Year: 2012

This paper presents an anticipatory load shedding methodology which determines optimum load shedding at selected buses under emergency based on voltage stability. Accurate load shedding saves loss of revenue to power utility in addition to avoiding voltage instability problem. The buses for load shedding have been selected based on the sensitivity of minimum eigenvalue of load flow Jacobian with respect to load shed. A computational algorithm for minimum load shedding has been developed using DE. The algorithm accounts inequality constraints not only in present operating condition but also for predicted next interval load. Developed algorithm has been implemented on IEEE 6-bus and 14-bus test systems. Results have been compared with those obtained using particle swarm optimization (PSO) and its variant based on statistical inference. © 2012 Elsevier Ltd. All rights reserved.


Arya L.D.,SGSITS | Singh P.,VITS | Titare L.S.,Government Engineering College
Swarm and Evolutionary Computation | Year: 2012

This paper proposes a methodology to optimize the load curtailments necessary to restore the equilibrium of operating point by accounting for operating and stability inequality constraints. To get desired stability margin Schur's inequality based proximity indicator has been selected whose threshold value along with minimization of load shedding assures desired static voltage stability margin. The methodology anticipates the risk of voltage instability in a time frame using sensitivity of proximity indicator of load flow Jacobian with respect to load. If the normal controls are exhausted, the proposed algorithm based on sensitivity, sheds, required amount of low priority loads in advance. This makes the system to survive voltage instability threat even during worst system period. The buses which are having large sensitivity are selected for load shedding. A computational algorithm for minimum load shedding at selected load buses has been developed using Differential Evolution (DE), Self-adaptive Differential Evolution (SaDE) and Ensemble of Mutation and Crossover Strategies and Parameters in Differential Evolution (EPSDE). Developed algorithm accounts inequality constraints not only in present operating conditions (after load shedding) but also for predicted next interval load (with load shedding). Proposed methodology has been implemented on IEEE 14-bus and 25-bus test systems. Performance of the methodology has been compared with Davidon-Fletcher-Powell's (DFP), Particle Swarm Optimization (PSO), Co-ordinated Aggregation based Particle Swarm Optimization (CAPSO) and Genetic Algorithm (GA) techniques based on statistical inference. Simulation results have been obtained which confirm that the proposed methodology provide considerable mitigation in the load shedding and enhancement in voltage stability. By using this methodology various power system blackouts can be prevented. © 2012 Elsevier B.V. All rights reserved.


Titare L.S.,Government Engineering College | Singh P.,VITS | Arya L.D.,SGSITS | Choube S.C.,UIT
International Journal of Electrical Power and Energy Systems | Year: 2014

This paper presents an efficient and reliable evolutionary-based approach to solve the optimal reactive power dispatch (ORPD) problem. Optimal reactive power dispatch is a mixed integer, nonlinear optimization problem which includes both continuous and discrete control variables. The proposed approach employs Ensemble of Mutation and Crossover Strategies and Parameters in Differential Evolution (EPSDE) algorithm for optimizing a set of reactive power control variables such as generator voltages, tap positions of tap changing transformers and the amount of reactive compensation which maximizes reactive reserve available at generating buses. Voltage dependent reactive power limits have been accounted. Developed algorithm accounts inequality constraints not only in present operating conditions (after reactive power rescheduling) but also for predicted next interval load (with reactive power rescheduling). Proposed methodology has been implemented on IEEE 14-bus and 25-bus test systems. Performance of the methodology has been compared with Selfadaptive Differential Evolution (SaDE), Teaching Learning Based Optimization (TLBO) and Genetic Algorithm (GA) techniques based on statistical inference. © 2014 Elsevier Ltd. All rights reserved.


Singarapu U.,Jawaharlal Nehru Technological University | Adepu K.,National Institute of Technology Warangal | Arumalle S.R.,VITS
Journal of Magnesium and Alloys | Year: 2015

In this investigation, the effect of friction stir welding (FSW) parameters such as tool material rotational speed, and welding speed on the mechanical properties of tensile strength, hardness and impact energy of magnesium alloy AZ31B was studied. The experiments were carried out as per Taguchi parametric design concepts and an L9 orthogonal array was used to study the influence of various combinations of process parameters. Statistical optimization technique, ANOVA, was used to determine the optimum levels and to find the significance of each process parameter. The results indicate that rotational speed (RS) and traverse speed (TS) are the most significant factors, followed by tool material (TM), in deciding the mechanical properties of friction stir processed magnesium alloy. In addition, mathematical models were developed to establish relationship between different process variables and mechanical properties. © 2015.


Palagiri A.H.V.,V.I.T.S | Makkena M.L.,Jawaharlal Nehru Technological University | Chantigari K.R.,Nalla Narsimha Reddy Group of Institutions
Advances in Intelligent Systems and Computing | Year: 2016

SONAR and RADAR makes use of multiple beamforming systems. A novel Onboard Digital Beamforming (DBF) system suitable for various applications is implemented with mixed signal design of Sigma Delta ADC architecture. FPGA is configured as a Reconfigurable On-chip Sigma Delta ADC and analyzed for a multichannel beamforming system with Spartan 6, Virtex 4, and Virtex 6 FPGA. With the architectural variation, major advantages can be seen in SONAR beamforming and similar array processing applications. © Springer India 2016.


Kumar B.A.,VITS
Proceedings - 2012 2nd International Conference on Advanced Computing and Communication Technologies, ACCT 2012 | Year: 2011

Cross Language Information Retrieval is a sub field of Information Retrieval that deals with retrieving relevant information stored in a language different from the language of user's given query. It plays a vital role in future because large volume of information is stored in the web is in English. So there is a necessity of proper mechanisms that can retrieve some required relevant information in a collection of information or in a database. Generally the collection of stored information may not be necessarily in one language. The simplest way to search for the information is to scan every item in the database and when the need to translate the languages being used arises, and then there will be a need of developing Cross Language Information Retrieval systems will take place. This paper reviews some of the recent research methods focus on topics in cross language information retrieval and there great role in On-going latest innovative research directions in wide area of information retrieval systems will take place. © 2012 IEEE.


Sushma G.,VITS | Ramesh V.,VITS
2016 International Conference on Recent Trends in Information Technology, ICRTIT 2016 | Year: 2016

D flip flops are extensively used in analog, digital and mixed signal systems. D flip flops are first choice to realize different counters, shift registers and other circuits. One major consequence of scaling of CMOS technology is leakage power. To decrease power consumption and to improve life time of battery, the voltage supplied to the given circuit during standby mode should be reduced. This paper proposes a new D flip flop design which employs improved SVL technique in order to reduce power consumption due to leakage currents in standby mode. Also the proposed design uses less number of clocked transistors, thus reduces the dynamic power consumption as well as delay compared to existing design. Proposed design achieves 60.54% reduction in power delay product in comparison with existing D flip flop design. Both existing design and proposed design are simulated using Tanner T spice tool at 45nm technology. © 2016 IEEE.

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