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Some of the material in is restricted to members of the community. By logging in, you may be able to gain additional access to certain collections or items. If you have questions about access or logging in, please use the form on the Contact Page.
Superconducting magnet systems are the enabling technology for several research fields, e.g., experimental high-energy physics and fusion. Advanced superconducting magnet systems are strongly needed to achieve ever-higher beam energy in...
Systems with critical functionality and are prone to damage due to excessive stress level from operation conditions and working environment requires health monitoring. Condition or health monitoring involves acquiring data that can be...
In order to image or map targets on an ocean floor, a synthetic aperture sonar platform is moved underwater over the ocean floor. The platform pings or transmits acoustic signals, which reflect off the target back to the receiver. A...
The demand for high-voltage and high-power power electronics devices, especially for the next generation electrical ship system, has increased rapidly these years. The three-phase three-level neutral point clamped (NPC) rectifier...
Recent increased popularity in plug-in hybrid electric vehicles (PHEVs) has been influenced by their ability to relieve the economic dependence on oil, meanwhile reducing the carbon footprint through the decreased level of harmful...
In this thesis, an approach is proposed for the design and implementation of fuzzy traffic controllers using Field Programmable Gate Arrays (FPGAs).The focus of this study is to develop an effective traffic signaling strategy to be...
In this research, two important concepts concerning parallel robots are investigated: compliance and fault tolerance. First, we address the issue of synthesizing a suitable compliance. This is an important problem since a well-designed...
A proposed alternative wireless communication technique is developed and compared to the current radio frequency command link in a Flight Termination System. The command link in a Flight Termination System requires a reliable signal in a...
The demand for high-speed mobile wireless communications is rapidly growing. MIMO technology promises to be a key technique for achieving the high date capacity and spectral efficiency for wireless communication systems of the near...
Although many attempts have been made to construct an economically feasible Fault Current Limiter (FCL), no FCL has yet been widely accepted by the power industry. This thesis presents a novel fault current limiter for power system...
Many pattern recognition tasks employ artificial neural networks based on radial basis functions. The statistical characteristics of pattern generating processes are determined by neural networks. The Gaussian potential function is the...
Swarm behavior indicates the direct or indirect interactions among relatively simple agents to perform a particular task that is unknown to the individual agent. The study of swarm behavior originates from the research of swarms in...
Large-scale storage arrays are always in high demand by universities, government agencies, web search engines, and research laboratories. This unvarying need for more data storage has begun to push storage array magnitudes into an...
Switching-mode single-phase DC-AC converters have been widely used in critical applications such as uninterrupted power supply systems and AC motor drivers. Among various control techniques, Pulse Width Modulation (PWM) technique is the...
In this work, Side-Channel Attacks (SCAs) are considered as a security metric for the implementation of hybrid cryptosystems utilizing the neural network-based Tree Parity Re-keying Machines (TPM). A virtual study is presented within the...
Motion control of robot manipulators is typically accomplished by sensing and regulating the positions of the joint actuators to cause the end-effector to follow a programmed trajectory. Unfortunately, position control schemes usually...
An analytical impedance model and a small-signal equivalent circuit are derived for the impedance spectra of Li-air batteries with porous cathodes. The model takes into consideration the effects of the oxygen diffusion, double layer, and...
From an agency's perspective, having an Actuated Signal Controller that is interchangeable with a controller from a different manufacturer provides the agency with more options and does not get the agency locked with one specific...
The aim of the thesis is to include a Field Programmable Gate Array (FPGA) based electromagnetic transient simulation into a Real-time Digital Simulator (RTDS) power system simulation. This will enable the simulation of high-frequency...
In this thesis, three different RF coils were investigated for their application in Magnetic Resonance Imaging (MRI). We developed transmit/receive birdcage volume coils since they provide better B1 field homogeneity than other coils....
In recent years there has been an explosive growth in the number of wireless users, particularly in the area of mobile communication. In future, wireless mobile systems will be more sophisticated and more widespread. This growth has...
The microstructure of the catalyst layer in proton exchange membrane fuel cells (PEMFCs) greatly influences the utilization of the catalyst (Pt) and the overall cell performance. Research focused on two key components in optimizing the...
Estimation of a dynamical system under unknown influences is always subjected to uncertainty. Thus, reducing the estimation variance under external influences is absolutely desired and becomes the motivation for the field of System...
A physics-based model is proposed for the simulation of Li-air batteries. The model is carefully calibrated against published data and is used to simulate standard Li-air batteries with nonaqueous (organic) electrolyte. It is shown that...
Nuclear Magnetic Resonance (NMR) field mapping is a highly accurate tool that can be used to determine the homogeneity of the magnetic field of a strong laboratory magnet. Typically, an NMR signal is observed from a small experimental...
This dissertation addresses the development of efficient digital filter implementation techniques. Measures for area, latency, and throughput are used to quantify the benefits of the proposed implementation schemes, as well as...
Common military radar systems transmit sophisticated pulse compression waveforms for range information. Although much progress has been made in suppressing the platform radar cross section to avoid detection by enemy active radar, little...
Electrical power systems utilizing electromagnetic devices, namely those of electrical ships, are subject to nonlinearities from regenerative loads, distributed energy storage systems, and onboard loads such as air handling and fluid...
The proper intensity and chromaticity of traffic signals and signs play a key role in the safe management of the traffic environment. Light Emitting Diode (LED) becomes the most important light emitting device for traffic signals and...
My dissertation researches are on the field of fuel cell materials and fuel cell modeling. During my dissertation research, I authored two US patent applications and have developed several innovative approaches to new fuel cell materials...
Since their discovery by Iijima in 1991 carbon nanotubes have been used in many novel applications of nanotechnology. Carbon nanotubes thin films in particular can be used to create, among others, anti-reflection coatings or stretch...
Shapes of boundaries can play an important role in characterizing objects in images. Shape analysis involves choosing mathematical representations of shapes, deriving tools for quantifying shape differences, and characterizing imaged...
A robust and computationally efficient technique is developed for the design of fluctuation resistant structures (fault-tolerant) semiconductor devices. This technique can be applied to the computation of the doping profiles that...
As land-based robotic missions to Mars have increased in scope and mobility, NASA has intensified its research efforts involving the mechanisms of electrostatic charging on the surface of Mars. The primary concern is that electrostatic...
Mines pose a major threat to the fleet. Finding and clearing minefields is an extremely important but difficult task. In response, systems have been produced to scan the sea floor for mines. A tow fish, used in mine countermeasures by...
Quantum mechanical effects on fluctuations in ultrasmall semiconductor devices are studied. Quantum mechanical effects are included in the analysis by using the density gradient model, for which the main parameters ~effective masses! are...
Recently there have been increasing interests in developing the renewable energy resources for the future energy need. Solar energy generation has shown its great potential to serve as a clean distributed energy source. While one...
Field programmable gate arrays (FPGAs) are becoming increasingly prevalent in embedded digital signal processing applications. Faster clock speeds (now at 500 MHz), greater logic density, and dedicated embedded DSP hardware blocks are...
Nios Embedded processors provide a powerful, robust platform for developing and implementing complex algorithms. The unique custom instruction feature of Nios processors could be used to enhance the performance of these algorithms...
Advanced vehicle technology including hybrid electric vehicles, plug-in hybrid electric vehicles, and fuel cell hybrid electric vehicles are attracting attention recently, as climate change and energy shortage become a more and more...
Teleoperation is the control, operation, and manipulation of a robot or other device over distance. The way in which the master controller dictates how the slave moves in its workspace is called a command strategy. Here, two command...
Switching-mode single-phase DC-AC inverters have been widely used in many applications such as AC motor drivers and uninterrupted power supply systems. Among various control techniques, pulse-width-modulation (PWM) is the most effective...
Most clinical Magnetic Resonance Imaging (MRI) techniques use body coils for near field excitation and detection of an RF signal at 64-128 MHz, corresponding to magnetic field scanners of 1.5-3 T. Use of these conventional RF coils for...
Robot manipulators can be used to navigate and perform tasks in unstructured and hazardous environments where human safety is a primary concern. For example, they are used for nuclear waste disposal, space exploration, nuclear power...
The main goal of this master's thesis is to explore and develop centralized and optimization techniques for terrestrial power systems and for heterogeneous systems like a ship's cooling system. First, an agent based decentralized multi...
A motor drive system should be reliable, efficient, and robust under numerous applications, loads, and control schemes. To ensure such characteristics and fully test the range of operation for a motor drive, manufacturers and developers...
The research in this paper looks to advance a non-intrusive load monitoring system into a large-scale power system application. The basic concept of residential non-intrusive monitoring is looked at for implementation in monitoring...
Modal based traditional Structural Health Monitoring techniques are limited because of several factors – including a poorly-formed aggregate system model, very low SNR, and unrealistic boundary conditions. Moreover, global techniques...
Locating ground faults in ungrounded systems is inherently difficult because such faults do not provide considerable fault currents for tracing the fault location and the locating process has to be done during system operation. In this...
The newly discovered bulk Ca2 RuO4 is an antiferromagnetic Mott insulator with the metal-insulator transition above room temperature and Neel temperature at 113 K. There is a strong coupling between crystal structures and electronic...
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