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Comparison Of Classification Methods For Perspiration-Based Liveness Algorithm, Sujan T. V. Parthasaradhi
Comparison Of Classification Methods For Perspiration-Based Liveness Algorithm, Sujan T. V. Parthasaradhi
Graduate Theses, Dissertations, and Problem Reports
In the modern world there is a need for security. Biometric technologies provide a means for providing this security. Of the many different available biometric technologies, fingerprint recognition is the most popular. As with all security measures, biometric devices may be subject to attacks on the system. Fingerprint scanners may be susceptible to spoofing using artificial materials, or in the worst case, dismembered fingers. Liveness, i.e. to determine whether the introduced biometric is coming from a live source, has been suggested as a means to circumvent attacks that use spoof fingers. It has been shown that water based casting materials …
Designing A Scalable Dynamic Load -Balancing Algorithm For Pipelined Single Program Multiple Data Applications On A Non-Dedicated Heterogeneous Network Of Workstations, Ashraf Osman
Graduate Theses, Dissertations, and Problem Reports
Dynamic load balancing strategies have been shown to be the most critical part of an efficient implementation of various applications on large distributed computing systems. The need for dynamic load balancing strategies increases when the underlying hardware is a non-dedicated heterogeneous network of workstations (HNOW). This research focuses on the single program multiple data (SPMD) programming model as it has been extensively used in parallel programming for its simplicity and scalability in terms of computational power and memory size.;This dissertation formally defines and addresses the problem of designing a scalable dynamic load-balancing algorithm for pipelined SPMD applications on non-dedicated HNOW. …
Spline Based Controller For Nonlinear Systems, Ali Karimi
Spline Based Controller For Nonlinear Systems, Ali Karimi
Graduate Theses, Dissertations, and Problem Reports
The objective of this thesis is to apply spline theory to implement controllers for nonlinear systems. Two different systems, forced Duffing oscillators and power systems, are investigated. The spline method is used to mimic the controller which drives a state of the Duffing system toward a desired path. The spline-based nonlinear controller has piecewise polynomial segments with different order of polynomials on each segment. Controller efforts for different order of polynomial interpolants and power spectral densities of the controller signals are compared with the exact feedback linearizaton method.;The first objective for power systems is to design nonlinear excitation controllers for …
Adding Liveness Detection To The Hand Geometry Scanner, Musat C. Crihalmeanu
Adding Liveness Detection To The Hand Geometry Scanner, Musat C. Crihalmeanu
Graduate Theses, Dissertations, and Problem Reports
In today's dynamic society, the efficiency of the Biometric Systems has an increasing tendency to replace the classic but obsolete keys and passwords. Hand Geometry Readers are popular biometrics used for Access and Control applications. One of their weaknesses is vulnerability to spoofing using fake hands (latex, play-doh or dead-hands).;The objective of this thesis is to design a feature to be added to the Hand Geometry Scanner in order to detect vitality in the hand, reducing spoofing possibilities.;This thesis demonstrates how the Hand Reader was successfully spoofed and shows the implementation of the live detection feature through an inexpensive but …
Model Predictive Control Design For Load Frequency Control Problem, Nedzad Atic
Model Predictive Control Design For Load Frequency Control Problem, Nedzad Atic
Graduate Theses, Dissertations, and Problem Reports
Load Frequency Control (LFC) is a mechanism by which power generation and power demand are balanced.;Model Predictive Control (MPC) has been widely accepted as a viable control strategy in the process industry. It is a model based control strategy where an optimization procedure is performed in every sampling interval over a prediction horizon, yielding an optimal control action. The optimization criterion, or objective function, is chosen in such a way as to satisfy the controlled system dynamics and constraints, penalize system output deviation from the desired trajectory, and minimize control efforts. Furthermore, a possibility to incorporate economic objectives into the …
Estimating Reliability Impact Of Biometric Devices In Large Scale Applications, Karthikeyan Mahadevan
Estimating Reliability Impact Of Biometric Devices In Large Scale Applications, Karthikeyan Mahadevan
Graduate Theses, Dissertations, and Problem Reports
In the last two decades, there has been a tremendous growth of biometric applications especially in security. Reliability of the biometric devices is extremely important.;This thesis discusses an approach for estimating the reliability of systems, which contain biometric user authentication subsystem. The ECRA (Early Component Based Reliability Assessment) tool utilizes an easy to use interface and employs the Bayesian algorithm to predict the system reliability. This application of the ECRA technique to biometrics is new. Using the UML diagrams and the ECRA tool, the reliability of the system is predicted.
Telecommunication Of Stabilizing Signals In Power Systems, Guillaume Julien Raux
Telecommunication Of Stabilizing Signals In Power Systems, Guillaume Julien Raux
Graduate Theses, Dissertations, and Problem Reports
Deregulation of the power industry has occurred at a rapid pace, opening some promising competition between suppliers. The result of this competition should be to the benefit of customers.;Telecommunication plays a crucial role in integrating systems and ensuring smooth operation by way of exchanging data and information between various systems that are responsible for monitoring and control of the grid. For example, a Power System Stabilizer (PSS) controller could be placed at one of the generators and requires remote measurements. All the communication schemes within the network generate delays that are characterized in this project using OPNET Modeler. OPNET Modeler …
Adaptive Fault Diagnosis In Interactive Electronic Technical Manuals (Ietms), Rabih Faysal Kraidli
Adaptive Fault Diagnosis In Interactive Electronic Technical Manuals (Ietms), Rabih Faysal Kraidli
Graduate Theses, Dissertations, and Problem Reports
An Interactive Electronic Technical Manual (IETM) is a technical manual that is prepared in digital format to provide information about the diagnostics and maintenance of complex systems.;In this thesis we present a methodology for adaptive fault diagnosis in IETMs, a methodology that constantly adapts the fault diagnosis procedure, according to the experience of the user performing the diagnosis. We develop a framework of adaptation that constantly monitors user behavior, and "learns" about the fault and its possible causes as the system is used, hence making it easier to perform such procedures, which increases efficiency of usage of such a manual, …
Novel Control Design And Strategy For Load Frequency Control In Restructured Power Systems, Dulpichet Rerkpreedapong
Novel Control Design And Strategy For Load Frequency Control In Restructured Power Systems, Dulpichet Rerkpreedapong
Graduate Theses, Dissertations, and Problem Reports
In restructured electric power systems, a number of generation companies and independent power producers compete in the energy market to make a profit. Furthermore, a new marketplace for ancillary services is established, providing an additional profit opportunity for those power suppliers. These services are essential since they help support the transmission of power from energy sources to loads, and maintain reliable operation of the overall system. This dissertation addresses regulation , a major ancillary service also known as the load frequency control (LFC) problem, and presents novel control designs and strategies for the LFC in restructured power systems.;A power system …