Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 30 for “"Electrical/Computer Engineering"”.
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Securing Wireless Broadcast Communications against Internal Attacks
The pervasiveness of wireless communications in modern society is unprecedent. Using numerous wireless technologies, including cellular, WiFi, WiMax and others, users gain ubiquitous access to a wealth of information services relevant to their everyday lives. These include communication services …
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Compressive Measurement of Spread Spectrum Signals
Spread Spectrum (SS) techniques are methods used in communication systems where the spectra of the signal is spread over a much wider bandwidth. The large bandwidth of the resulting signals make SS signals difficult to intercept using conventional methods based on Nyquist sampling. Recently, a …
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Micromagnetic analysis of co-based magnetic nanostructures.
… this method achieved good agreement with electrical measurements performed on Co/Cu multilayer nanowire arrays.
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Non-Binary Coded Modulation for FMF-Based Coherent Optical Transport Networks
The Internet has fundamentally changed the way of modern communication. Current trends indicate that high-capacity demands are not going to be saturated anytime soon. From Shannon's theory, we know that information capacity is a logarithmic function of signal-to-noise ratio (SNR), but a linear …
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Design and Implementation of Low Jitter Clock Generators in Communication and Aerospace System
The high demands on data processing and bandwidth in wireless/wireline communication and aerospace systems have been pushing forward circuit design techniques to their limitations to obtain maximum performances with respect to high operating frequency, low noise, small area, and low power …
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Spoken Language Processing and Modeling for Aviation Communications
<p>With recent advances in machine learning and deep learning technologies and the creation of larger aviation-specific corpora, applying natural language processing technologies, especially those based on transformer neural networks, to aviation communications is becoming increasingly feasible. …
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Antenna Multi-Band Enhancement by Employing Negative Impedance Converters
<p>This thesis presents the implementation of a Negative Impedance Converter (NIC) integrated with a planar monopole antenna, originally centered at 2.9 GHz, to create a multi-band network. The network exhibits resonances at frequencies of 0.9 GHz, 1.5 GHz and 1.9 GHz. The work highlights the …
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Sensing, Actuation, and Embedded Control for a Custom SCR Nitrogen Oxides Emissions Reduction System
<p>Diesel engines are the main power source for medium and heavy duty on road vehicles. With the rising standards for mileage of vehicles set by the Corporate Average Fuel Economy and the Environmental Protection Agency, diesel engines should soon be considered in lieu of gas engines. Despite …
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A Design Flow for Additively Manufactured 3D Metasurface Antennas
<p>Metasurface (MTS) antennas are complex arrays consisting of hundreds or thousands of individual elements that each exert their own influence on the performance of the antenna. Due to this, the process of designing and developing a MTS antenna can be intensive in terms of both the time to …
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Characterization of Electron Number Density of Rocket Exhaust Plumes Through Microwave Transmissions
… to the plume can be associated with the plume's electrical properties, which are coupled to plasma characteristics including the electron number density. However, the electron number density of rocket plumes is not well-known. In this study, the electron number density is characterized through …
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Tsunami Warning System
<p>The effects of a tsunami on a coastline can be devastating. In an attempt to mitigate the damages caused by tsunamis, and to provide coastal communities with evacuation alerts, it is essential to have early warning systems installed offshore. Tsunami early warning systems can detect the …
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An Approach to Automotive Electrification and Testing
… charging capability. This paper will cover the electrical work performed on the vehicle during the summer prior to year three of the competition, EcoCAR 2 year three, and preliminary work for EcoCAR 3 year one competition. The main focus of this paper will be on the electrical system integration …
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Feasibility of Neural Networks for Maritime Visual Detection on a Mobile Platform
<p>Object detection through computer vision has traditionally been difficult to reliably implement due to various lighting conditions caused by weather and time of day. Any changes in conditions can be detrimental to the detector’s ability to accurately identify objects. A modern approach …
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Reduction of Near-Field Grating Lobes in Sparse Acoustic Phased Arrays
<p>Acoustic phased arrays with inter-element spacings of greater than one half-wavelength will produce grating lobes that decrease the usefulness of the array. With many array configurations, the near-field and far-field character of these lobes is significantly different -- an optimization of the …
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Investigation of Communication Constraints in Distributed Multi-Agent Systems
… and the distributed algorithm is studied through computer simulations. Finally, to better exploit the communication channel among agents, we study a recently proposed formation control multi-agent algorithm, which optimizes the inter-agent distance in order to achieve optimum inter-agent …
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A System for the Detection of Adversarial Attacks in Computer Vision via Performance Metrics
… are prevalent in the deep learning tasks of computer vision and are one of the greatest threats to these models' safe and accurate use. These attacks force the trained model to misclassify an image, using pixel-level changes undetectable to the human eye. Various defenses against these …
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Aircraft Detection and Tracking Using UAV-Mounted Vision System
<p>For unmanned aerial vehicles (UAVs) to operate safely in the national airspace where non-collaborating flying objects, such as general aviation (GA) aircraft without automatic dependent surveillance-broadcast (ADS-B), exist, the UAVs' capability of “seeing" these objects is especially important. …
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The Design, Simulation and Synthesis of Pipelined Floating-Point Radix-4 Fast Fourier Transform Data Path in VHDL
The Fast Fourier Transform (FFT) converts time or spatial information into the frequency domain. The FFT is one of the most widely used digital signal processing (DSP) algorithms. DSPs are used in a number of applications from communication and controls to speech and image processing. DSPs have …
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Electrical Optimization of a Plug-In Hybrid Electric Vehicle
… the power distribution unit and the approach the electrical team took when building the electric portion of the vehicle. Simulations were done based on manufacturer data and bench tests to create an ideal model. Data was collected from the vehicle and compared to the ideal model to determine …
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Experimental Validation of a New Distributed Cooperative Control Algorithm for Multi-agent Systems with Switching Communication Topologies and Time-Delays
… in distributed cooperative formation control. Computer simulations and hardware experiments presented include point consensus control and formation control, both with changing topologies and time-delays. In addition to 2D simulations and experiments, we also developed the 3D model for more …
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