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Gudavalli M.,Vignans Nirula Institute of Technology and Science for Women | Viswanadha Raju S.,Jawaharlal Nehru Technological University | Vinaya Babu A.,JNTUH College of Engineering | Srinivasa Kumar D.,Nalanda Institute of Technology
Proceedings - 2012 International Symposium on Biometrics and Security Technologies, ISBAST 2012

Biometrics is the science and technology of measuring and analyzing biological data of human body, extracting a feature set from the acquired data, and comparing this set against to the template set in the database. The increasing demand of enhanced security systems has led to an unprecedented interest in biometric based person authentication system. Biometric systems based on single source of information are called Unimodal systems. Although some Unimodal systems have got considerable improvement in reliability and accuracy, they often suffer from enrollment problems due to non-universal biometrics traits, susceptibility to biometric spoofing or insufficient accuracy caused by noisy data. Hence, single biometric may not be able to achieve the desired performance requirement in real world applications. One of the methods to overcome these problems is to make use of multimodal biometric authentication systems, which combine information from multiple modalities to arrive at a decision. Multimodal biometric systems are those which utilize, or capability of utilizing, more than one physiological or behavioral characteristic for enrollment, verification, or identification. Studies have demonstrated that multimodal biometric systems can achieve better performance compared with Unimodal systems. We discuss here different multimodal sources, multimodal architectures different fusion techniques used in multimodal biometric systems. © 2012 IEEE. Source

Rajesh T.,Vignans Nirula Institute of Technology and Science for Women | Babu Y.S.K.,Vignan University | Tagore Y.R.,Vignan University
Proceedings - 4th International Conference on Computational Intelligence and Communication Networks, CICN 2012

This paper presents a hybrid system controller, incorporating fuzzy controller with vector control method for induction motors. The vector-control method has been optimized by using both PI and fuzzy controllers. This combines the benefits of fuzzy logic controller and vector-control in a single system controller. High quality of the regulation process is achieved through utilization of the fuzzy logic controller, while stability of the system during transient processes and a wide range of operation are assured through application of the vector control. This paper also deals with the speed estimators for applications in sensor less induction motor drive with vector control. In the present work, Indirect vector controlled induction motor sensor less drive with PI and Fuzzy controllers is implemented. It shows that the performance is better for fuzzy when compare to PI controller. © 2012 IEEE. Source

Nagateja T.,Andhra University | Venkata Rao T.,Vignans Nirula Institute of Technology and Science for Women | Srinivasulu A.,Andhra University
2015 International Conference on Communication and Signal Processing, ICCSP 2015

Feature size of CMOS technology continues to scale down; new devices like FinFET are experimented and proposed as an alternative device due to its superior characteristics. In this paper we have presented low voltage, high speed 1-bit full adder cells in Branch Based Logic and Pass Transistor (BBL-PT) logic by using FinFET model parameters. In BBL-PT full adder lies a drawback i.e. voltage step existed in sum output. That could be eliminated in the proposed logics by using the diode connected FinFET (D-FinFET) inverter, N-type FinFET inverter and modified current sink restorer structures. Proposed full adder circuits are compared with conventional adder circuits, and proposed circuits have demonstrated the good delay performance. The performance of proposed and other conventional full adder circuits are examined using Cadence and the model parameters of 180 nm CMOS technology with +1.2 V supply rail voltage and 20 nm FinFET model files with +0.6 V supply rail voltage with frequency 100 MHz. © 2015 IEEE. Source

Gudavalli M.,Vignans Nirula Institute of Technology and Science for Women | Raju S.V.,Jawaharlal Nehru Technological University | Kumar K.S.M.V.,Siddhartha Institute of Engineering and Technology
ACM International Conference Proceeding Series

Biometrics have long been used for various applications in the areas like access control to facilities and computers, criminal identification, border security, access to nuclear power plant, identity authentication in network environment, airport security, and issue of passports or driver licenses, forensic and medical databases. As biometric finds its applications in several high security areas providing security to biometric template is of utmost importance. A biometric is permanently associated with a user and cannot be changed. Hence, if a biometric identifier is compromised, it is lost forever and possibly for every application where the biometric is used. Moreover, if the same biometric is used in multiple applications, a user can potentially be tracked from one application to the next by cross-matching biometric databases. Biometrics also leaks personal information to the attacker. Nevertheless, biometric systems are prone to a variety of attacks. The stored biometric template attack is the most severe of all the attacks. Biometric templates cannot be reissued on spoofing. Therefore, apart from security; biometric templates should be imparted with revocability. No single template protection method reported in recent years is capable of satisfying the diversity, revocability, security and performance requirements. Copyright 2012 ACM. Source

Ravindranath Tagore Y.,Vignan University | Pidikiti T.,Vignans Nirula Institute of Technology and Science for Women
Proceedings - 2013 International Conference on Machine Intelligence Research and Advancement, ICMIRA 2013

In this paper a new soft-switching technique for ZVS based buck converter using coupled inductors is considered in detail. The purpose of soft switching technique is to minimize voltage and current overlapping area, which in turn minimizes the switching losses and increase the efficiency of the converter. In this paper modeling and simulation of ZVS based converter with PID and Sliding mode Controllers is explained for performance comparison. © 2013 IEEE. Source

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