Vignan Institute of Technology and Science
Nalgonda, India

Vignan Institute of Technology & Science is one of the engineering institutions run by the Vignan group of Guntur. It was established in 1999 to offer undergraduate courses in Engineering and Technology. It is situated in Deshmukhi, a suburban region of Hyderabad, India.The college is affiliated to Jawaharlal Nehru Technological University, Hyderabad, Telangana.BTech programs offered are Computer Science and Engineering, Electrical & Electronics Engineering, Electronics and Communications Engineering, Electronics & Instrumentation Engineering, Instrumental & Control Engineering and Mechanical Engg. The Post Graduate courses offered are MBA, MCA and M.Tech. Wikipedia.

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Radha Rani K.,Rashtreeya Vidyalaya College of Engineering | Amarnath J.,JNTUH College of Engineering | Kamakshaiah S.,Vignan Institute of Technology and Science
International Review on Modelling and Simulations | Year: 2011

The electric power industry is in transition to a deregulated market place for power transactions. In this environment, all power transactions are made based on price rather than cost. In a deregulated energy marketplace, participants are interested in maximizing their own profits, regardless of the system-wide profits. It is perceived that the competition will reduce the price of electricity for retail customers; however, the key issue for participants is related with the price definition to remain competitive. With increased power transfer, transient stability is increasingly important for secure operation. Transient stability evaluation of large scale power systems is an extremely intricate and highly non-linear problem. An important function of transient evaluation is to appraise the capability of the power system to withstand serious contingency in time, so that some emergencies or preventive control can be carried out to prevent system breakdown. In practical operations correct assessment of transient stability for given operating states is necessary and valuable for power system operation. In this paper, transient stability analysis is used to test the stability of the system for contingency. Contingency analysis (CA) is critical in many routine power system and market analyses to show potential problems with the system. The proposed method is to analyze an IEEE 37-bus, 9-generator system with contingency using Power World simulator. © 2011 Praise Worthy Prize S.r.l. - All rights reserved.

Vijayalaxmi,Gandhi Institute of Technology and Management | Rao P.S.,Vignan Institute of Technology and Science
International Conference on Intelligent Systems Design and Applications, ISDA | Year: 2012

Eye detection has many applications in computer vision systems. A novel approach of eye detection for facial images using Gabor Filter and support vector machine (SVM) is proposed in this paper. Eye/non-eye patterns are rotated by different angels using Gabor Filter and then used to train SVM. In the proposed approach first face is extracted using skin colour information and later using Lab transform and Morphological operations eye pair candidates are detected which are given to SVM classifier to classify the detected eye pair candidates as eye or non-eye. The Lab and HSV colour space are used for face extraction and to find eye pair candidates. Separable Gabor filters are used to decrease computation time and the rotation-invariant characteristics of the Gabor Filter makes this method robust against rotation. The proposed approach is tested on rotated images of the GTAV[13] database and is also experimented on videos captured at VITS and the success rate achieved is 96%. © 2012 IEEE.

Biradar V.,Vignan Institute of Technology and Science | Elizabath Rani D.,Gandhi Institute of Technology and Management
Advances in Intelligent Systems and Computing | Year: 2016

The real-time implementation of embedded image processing applications needs a fast processor. Eye recognition is an important part of image processing systems such as driver fatigue detection system and eye gaze detection system. In these systems, a fast and accurate real-time implementation of face and eye tracking is required. Hence, a new approach to determine and track face and eye on live images is proposed in this paper. This proposed method is implemented and successfully tested in laboratory for various real-time images with and without glasses captured through Logitech USB Camera of 1600 × 1200 pixels @ 30 fps. The method is developed on 1 GHz open multimedia applications platform (OMAP) processor and the algorithm is developed using OpenCV libraries. The success rate of the proposed algorithm shows that the hardware has sufficient speed and accuracy, which can be used in real time. © Springer Science+Business Media Singapore 2016.

Venkata Ramana M.,Vignan Institute of Technology and Science
International Journal of Applied Engineering Research | Year: 2015

Present investigation aims at optimizing the process parameters of CO2 moulding process for better Tensile Strength. Taguchi method has been successfully applied for the purpose. It is observed that % of sodium silicate and coal dust are the significant factors affecting Tensile Strength and out of these two sodium silicate has got more predominant effect. © Research India Publications.

Upender P.,Vignan Institute of Technology and Science
RAECE 2015 - Conference Proceedings, National Conference on Recent Advances in Electronics and Computer Engineering | Year: 2015

Soil moisture estimation has been an area of significant interest due to its widespread applications in the estimation and modeling of various large-scale ecological processes. Many approaches based on experimental observations and theoretical reasoning has been developed for soil moisture retrieval from SA systems. Among the major models developed, the empirical model proposed by Dubois et al. proves to be a good choice, because of its wide applicability and simplicity of implementation. Therefore to retrieve crop /vegetation covered soil moisture with SAR data is quite challenging. It is important point of research to minimize the use of apriori information while retrieving the parameters with SAR data. In this paper, two approaches have been selected for the retrieval of soil moisture and account for the vegetation effects. In the first approach, the water cloud model is used to introduce vegetation correction into the backscattering coefficients, which are then used in the inversion model to yield better soil moisture retrieval results. This requires apriori knowledge of several ground-measurable vegetation parameters. In the second approach, role of fusion of optical data into microwave synergistic model is applied where use of apriori information in minimizing the vegetation effects. First approach has been further modified in this paper to get good soil moisture estimation. The two approaches are applied to PALSAR data and MODIS data and its accuracy is estimated using Root Mean Square Error (RMSE) calculated between ground truth data and that measured using the two approaches. A quite good agreement between observed and retrieved soil moisture is observed from both the methods (water cloud & ground truth data. © 2015 IEEE.

Goura R.,Vignan Institute of Technology and Science
International Journal of Sustainable Energy | Year: 2015

In the near future, the power scenario across countries worldwide is expected to impact substantially on the solar photovoltaic system. This paper demonstrates the design and performance analysis of a 1000-kilowatt (kW)-grid-tied solar photovoltaic plant (PVP). The PVP is partitioned into four small solar PVPs of 250 kW each, consisting of an inverter and a combination of solar panels arranged in series and parallel. For better characterisation of overall plant performance, the power-generating system (solar PVP) is analysed by considering several parameters. After monitoring the plant over a span of one year, the data-based information is compiled by adding some final conditions and relative results on the PVP efficiency. Results show the annual performance ratio average was 0.77. © 2013, © 2013 Taylor & Francis.

Jillella V.R.,Vignan Institute of Technology and Science | Parvataneni S.R.,Vignan Institute of Management and Technology for Women
Advances in Intelligent Systems and Computing | Year: 2016

At present, performance and efficiency of a system-on-chip (SoC) design depends significantly on the on-chip global communication across various modules on the chip. System-on-chip communication is generally implemented using a bus architecture that runs very long distances and covers significant area of the integrated circuit. The difficult challenges in design of a large SoC such as one containing many processor cores include routing complexity, power dissipation, hardware area, latency, and congestion of the communication system. This paper proposes an analog bus for digital data. In this scheme, it replaces ‘n’ wires of an ‘n’-bit digital bus carrying data between cores with just one (or a few) wire(s) carrying analog signal(s) encoding ‘2n’ voltage levels. This analog bus uses digital-to-analog converter (DAC) drivers and analog-to-digital converter (ADC) receivers. This on-chip communication proposal can potentially save power and area. Diminution in the number of wire lines saves chip area and the reduction in total intrinsic wire capacitance consequently reduces the power consumption of the bus. The scheme should also reduce signal interference and cross-talk by eliminating the need for multiple line drivers and buffers. In spite of over-heads of the ADCs and DACs, this scheme provides significant power saving. Linear technology SPICE simulations show that the ratio of the power of the bus consumed by the proposed analog scheme to a typical digital scheme (without bus encoding or differential signalling) is given by Panalog/Pdigital = 1/(3n) where ‘n’ is the width of the bus. © Springer Science+Business Media Singapore 2016.

Dinesh Kumar N.,Vignan Institute of Technology and Science
Advances in Intelligent Systems and Computing | Year: 2016

Indian MST Radar antenna comprises of 1024 three-component Yagi-Uda receiving antennas masterminded in a 32 × 32 matrix over a territory of 130 m × 130 m. The antenna array is fed by 32 distributed transmitters whose peak output power varies from 15 to 120 kW. Because of different reasons a few number of transmitters are nonoperational making the linear subarray relating to these transmitters ineffectual. Also, inside a subarray, it is conceivable that a few components would not get the excitation motion because of the detached association or discontinuity issues in the feeder line. The paper talks about these outcomes in the thinning of the aperture, array pattern distortion, and the deviation of the excitation from the predefined Taylor distribution. The constantly expanding demand in the advancement of software for aperture thinned radiation pattern has spurred to model the present work. Matlab is used to perform the investigation and to plot the radiation designs in both principle planes and in three-dimensional view. © Springer Science+Business Media Singapore 2016.

Narmada A.,Vignan Institute of Technology and Science | Rao P.S.,Vignan Institute of Technology and Science
Proceedings of International Conference on Computational Intelligence, Modelling and Simulation | Year: 2012

Wireless sensor network (WSN) consists of distributed sensor nodes in the remote locations and are used to measure the sensor data in remote locations. Each node of WSN consists of a wireless micro controller interfaced with sensors. The user is confronted with independently working and diverse electronic devices like television, PDAs, laptops etc. Middleware is required to glue all these heterogeneous devices. This also integrates WSN with IP to cater the real world requirements and enables the electronic device of the IP-based WSN to access the other device of the same or different network. TCP / IP stack is not suitable to be ported into the memory of WSN node. It occupies more memory and causes more overhead to the WSN. There are two basic approaches towards the realization of IP based WSN viz., gateway based approach and virtual gateway approach. A new network based on wireless micro controllers to integrate IP and WSN is proposed. The hardware is employed with one coordinator, three routers and one handheld device that integrate IP and WSN. New addressing mechanisms are proposed to create virtual IP and WSN addresses as part of this integration. © 2012 IEEE.

Suresh D.,Vignan Institute of Technology and Science | Singh S.P.,Indian Institute of Technology Roorkee
Electric Power Components and Systems | Year: 2016

A three-phase four-wire active power filter is proposed in this article that consists of a three-phase three-wire active power filter, zero-sequence transformer, and single-phase active power filter. The reference current for tracking the desired source current is based on the neural network (constraint anti-Hebbian rule algorithm). The three-phase three-wire active power filter compensates current harmonics and reactive power requirement of the non-linear load. A zero-sequence transformer and single-phase active power filter are used to mitigate the neutral current. The proposed hybrid scheme (three-phase four-wire active power filter) significantly reduces the volt–ampere rating of the active power filter and improves the performance under different utility voltage conditions. The simulation of the proposed three-phase four-wire active active power filter is carried out for different voltage conditions. Further, the MATLAB-simulated (The MathWorks, Natick, Massachusetts, USA) response of the three-phase four-wire active active power filter has been validated on a prototype of the three-phase four-wire active-active power filter. The experimental result obtained from the prototype verifies the effectiveness and viability of the proposed scheme. 2016 Copyright © Taylor & Francis Group, LLC

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