Vignan University

About: Vignan University is a education organization based out in Guntur, Andhra Pradesh, India. It is known for research contribution in the topics: Control theory & CMOS. The organization has 1138 authors who have published 1381 publications receiving 7798 citations.

A Review on Utilizing Bio-Mimetics in Solving Localization Problem in Wireless Sensor Networks.

Abstract: Wireless Sensor Networks (WSNs) have the feasibility to connect the physical world with the virtual world by framing a network of sensors. The supreme function of a sensor network is to collect and forward data to the destination. Applications based on WSNs needs location knowledge about randomly deployed nodes. Localization of these nodes is the basic problem in WSNs. Several types of research have been done so far, using various strategies to improve the network performance as well as energy efficiency and communications effectiveness of WSNs. Among the strategies used, algorithms inspired by natural behaviours of a group of organisms like butterflies, fireflies, grey wolf, etc., showed higher efficiency in locating the nodes. In this survey, some of the inherent nature inspired localization algorithms are briefly discussed. Also, some other collective behaviours which can be used to develop localization algorithms are also explained.

A New Approach for Quiet wellbeing organization framework using e-health Monitoring design

Abstract: In this work delineates the plan and usage of e-wellbeing checking arranged framework by using Raspberry pi- processor. The engineering for this framework depends on shrewd gadgets and remote sensor systems for constant investigation of different parameters of patients. This framework is gone for building up an arrangement of modules which can encourage the conclusion for the specialists through checking of patients. It likewise encourages nonstop examination of the patient for emergencies researched by members and parental figures. A course of action of therapeutic and biological sensors is used to screen the prosperity and the including of the patient. This sensor information is then handed-off to the server utilizing a savvy gadget or a base station in nearness. The specialists and parental figures screen the patient continuously through the information got through the server. The restorative history of every patient including solutions and therapeutic reports are put away on cloud for simple get to and handling for coordination’s and anticipation of future difficulties. The engineering is so intended for observing a unitary patient secretly at home and additionally different patients in doctor's facilities and general human services units. Utilization of cell phones to transfer information over web lessens the aggregate cost of the framework. We have additionally considered the protection and security parts of the framework keeping the arrangement for specific power for patients and their relatives to get to the distributed storage and in addition the conceivable dangers to the framework.

Design and implementation of micro controller based four - level converter for Energy storage system used in Electric/ Hybrid Electric Vehicle

Abstract: The Hybrid Electric Vehicle (HEV) is the first step in reducing the environmental impacts of automobile use without losing comfort, performance and extended driving range. The success of the transition to Hybrid Vehicles depends on battery capabilities, converter system and cost. This paper proposes a new isolated Dual bridge Four-level pulse width modulated dc-dc converter (DBPWMC) with small inductance and no dead time operation for Energy storage system (composed of several Batteries) of Electric/ Hybrid Electric Vehicle. With no dead time operation, energy is continuously transmitted from input DC source to Battery in whole switching period, which causes lower input ripple current and hence the smaller size input filter. Detailed analysis shows the proposed converter can have either lower voltage stress on all primary side power switches or soft switching properties when different driving schemes are applied. The 48V/100-W DC - DC to converter with PWM oscillator with a frequency of 20 KHz has been tested for the verification of the principle. The simulation and experimental results ensure the feasibility and advantages of the new approach.

Environmental Noise Analysis for Robust Automatic Speech Recognition

Abstract: Most of the speech communication applications viz. telephony, hands-free communication, voice recording, automatic speech recognition, interactive voice response system, human-machine interfaces, etc. that require at least one microphone, desired speech signal is usually contaminated by background noise and reverberation. As a result, the speech signal has to be “cleaned” with digital signal processing tools before it is played out, transmitted, or stored. The noise estimation and reduction techniques will help to clean and attenuate the noise component in speech data, known as Speech Enhancement. In this paper, we recorded the speech in different environmental conditions and estimated the noise signal/background noise distribution in speech. Now the speech is enhanced by using the compliment of Weiner-Hopf optimal filter. And this enhanced speech signal is given for training and testing the Automatic Speech Recognition (ASR) system, which will improve the word accuracy. The analysis of speech and results presented in this paper are produced using MATLAB.