Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- Adaptive control (1)
- Artificial Intelligence (1)
- Automotive (1)
- Continuum robot (1)
- Deregulation (1)
-
- Electric/Hydraulic Actuators (1)
- Frequency conversion (1)
- IQ mixer (1)
- Neural network (1)
- Nonlinear Control (1)
- Optimal Power Flow (1)
- Power Systems (1)
- Robot manipulator (1)
- Software defined radio (1)
- Taylor Series Expansion (1)
- Thermal Management System (1)
- Transient Stability (1)
- Uncertain kinematics (1)
- Whole arm grasping (1)
Articles 1 - 10 of 10
Full-Text Articles in Engineering
On The Stability Of Region Count In The Parameter Space Of Image Analysis Methods, Li Yu
On The Stability Of Region Count In The Parameter Space Of Image Analysis Methods, Li Yu
All Dissertations
In this dissertation a novel bottom-up computer vision approach is proposed. This approach is based upon quantifying the stability of the number of regions or count in a multi-dimensional parameter scale-space. The stability analysis comes from the properties of flat areas in the region count space generated through bottom-up algorithms of thresholding and region growing, hysteresis thresholding, variance-based region growing. The parameters used can be threshold, region growth, intensity statistics and other low-level parameters. The advantages and disadvantages of top-down, bottom-up and hybrid computational models are discussed. The approaches of scale-space, perceptual organization and clustering methods in computer vision are …
Techniques For Improving The Performance Of Coupled Oscillator Arrays, Venkatesh Seetharam
Techniques For Improving The Performance Of Coupled Oscillator Arrays, Venkatesh Seetharam
All Dissertations
Coupled oscillator arrays (COAs) have excellent synchronization properties that can be utilized to develop a low cost alternative to phased array systems for beam steering applications. The primary concerns in implementing the COA architecture are the sensitivity to cell-to-cell component variation and poor phase noise performance. Wide injection locking range oscillators reduce the sensitivity to component variation but degrade the array phase noise performance. The objective of this dissertation is to alleviate the concerns hindering the application of COAs by employing techniques to realize COAs with wide mutual injection locking ranges (MILR), improved phase noise characteristics and beam steering capabilities. …
Multi-Objective Generation Scheduling With Hybrid Energy Resources, Manas Trivedi
Multi-Objective Generation Scheduling With Hybrid Energy Resources, Manas Trivedi
All Dissertations
In economic dispatch (ED) of electric power generation, the committed generating units are scheduled to meet the load demand at minimum operating cost with satisfying all unit and system equality and inequality constraints. Generation of electricity from the fossil fuel releases several contaminants into the atmosphere. So the economic dispatch objective can no longer be considered alone due to the environmental concerns that arise from the emissions produced by fossil fueled electric power plants. This research is proposing the concept of environmental/economic generation scheduling with traditional and renewable energy sources. Environmental/economic dispatch (EED) is a multi-objective problem with conflicting objectives …
Improving The Performance Of Software Defined Radio By Employing Digital Feedback Of Radio Frequency Properties, Joel Simoneau
Improving The Performance Of Software Defined Radio By Employing Digital Feedback Of Radio Frequency Properties, Joel Simoneau
All Dissertations
This dissertation provides tools for the analysis and integration of the hardware and software components of a software defined radio for optimum radio frequency performance. A device is introduced that is able to give baseband feedback of radio frequency properties suitable for analysis in software. Three applications for the device are devised. The first is an image rejection upconverter that achieves greater than 65 dB of image rejection over a broad frequency range without the use of a radio frequency filter. The second application is a baseband correction scheme for extending the bandwidth and improving the magnitude and phase match …
Nonlinear Control Strategies For Advanced Vehicle Thermal Management Systems, Mohammad Salah
Nonlinear Control Strategies For Advanced Vehicle Thermal Management Systems, Mohammad Salah
All Dissertations
Advanced thermal management systems for internal combustion engines can improve coolant temperature regulation and servo-motor power consumption to positively impact the tailpipe emissions, fuel economy, and parasitic losses by better regulating the combustion process with multiple computer controlled components. The traditional thermostat valve, coolant pump, and clutch-driven radiator fan are upgraded with servo-motor actuators. When the system components function harmoniously, desired thermal conditions can be accomplished in a power efficient manner. Although the vehicle's mechanical loads can be driven by electric servo-motors, the power demands often require large actuator sizes and electrical currents. Integrating hydraulically-driven actuators in the cooling circuit …
Control Techniques For Robot Manipulator Systems With Modeling Uncertainties, David Braganza
Control Techniques For Robot Manipulator Systems With Modeling Uncertainties, David Braganza
All Dissertations
This dissertation describes the design and implementation of various nonlinear control strategies for robot manipulators whose dynamic or kinematic models are uncertain. Chapter 2 describes the development of an adaptive task-space tracking controller for robot manipulators with uncertainty in the kinematic and dynamic models. The controller is developed based on the unit quaternion representation so that singularities associated with the otherwise commonly used three parameter representations are avoided. Experimental results for a planar application of the Barrett whole arm manipulator (WAM) are provided to illustrate the performance of the developed adaptive controller.
The controller developed in Chapter 2 requires the …
Control Of Nonlinear Mechatronic Systems, Enver Tatlicioglu
Control Of Nonlinear Mechatronic Systems, Enver Tatlicioglu
All Dissertations
This dissertation is divided into four self-contained chapters. In Chapter 1, an adaptive nonlinear tracking controller for kinematically redundant robot manipulators is presented. Past research efforts have focused on the end-effector tracking control of redundant robots because of their increased dexterity over their non-redundant counterparts. This work utilizes an adaptive full-state feedback quaternion based controller developed in [1] and focuses on the design of a general sub-task controller. This sub-task controller does not affect the position and orientation tracking control objectives, but instead projects a preference on the configuration of the manipulator based on sub-task objectives such as the following: …
Manufacturable Process And Tool For High Performance Metal/High-K Gate Dielectric Stacks For Sub-45 Nm Cmos & Related Devices, Aarthi Venkateshan
Manufacturable Process And Tool For High Performance Metal/High-K Gate Dielectric Stacks For Sub-45 Nm Cmos & Related Devices, Aarthi Venkateshan
All Dissertations
Off state leakage current related power dominates the CMOS heat dissipation problem of state of the art silicon integrated circuits. In this study, this issue has been addressed in terms of a low-cost single wafer processing (SWP) technique using a single tool for the fabrication of high-κ dielectric gate stacks for sub-45 nm CMOS. A system for monolayer photoassisted deposition was modified to deposit high-quality HfO2 films with in-situ clean, in-situ oxide film deposition, and in-situ anneal capability. The system was automated with Labview 8.2 for gas/precursor delivery, substrate temperature and UV lamp. The gold-hafnium oxide-aluminum (Au-HfO2-Al) stacks processed in …
Low-Complexity Iterative Detection Techniques For Slow-Frequency-Hop Spread-Spectrum Communications With Reed-Solomon Coding., Harish Ramchandran
Low-Complexity Iterative Detection Techniques For Slow-Frequency-Hop Spread-Spectrum Communications With Reed-Solomon Coding., Harish Ramchandran
All Dissertations
Slow-frequency-hop (SFH) spread-spectrum communications provide a high level of robustness in packet-radio networks for both military and commercial applications. The use of a Reed-Solomon (R-S) code has proven to be a good choice for use in a SFH system for countering the critical channel impairments of partial-band fading and partial-band interference. In particular, it is effective when reliability information of dwell intervals and individual code symbols can be obtained and errors-and-erasures decoding (EE) can be employed at the receiver.
In this dissertation, we consider high-data-rate SFH communications for which the channel in each frequency slot is frequency selective, manifesting itself …
Analytical And Intelligent Techniques For Dynamically Secure Dispatches, Aftab Alam
Analytical And Intelligent Techniques For Dynamically Secure Dispatches, Aftab Alam
All Dissertations
The NERC August 14th Blackout report brought out by the task force cited 'failure to ensure operation within secure limits' as one of the main reasons. Many of the numerous recommendations focused on the need for better real-time tools for operators and reliability coordinators. In the absence of such tools the operators are limited to operating in conservative secure operating regions established using offline studies. At the same time, with the fast inception of deregulation, the need to ensure a reliable and secure power system has become all the more vital. The success of a competitive market is dependent upon …