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Articles 61 - 76 of 76
Full-Text Articles in Engineering
Planar Electromagnetic Band Gap For Broadband Switching Noise Mitigation In High-Speed Pcb, Kevin H. Nguyen
Planar Electromagnetic Band Gap For Broadband Switching Noise Mitigation In High-Speed Pcb, Kevin H. Nguyen
Theses and Dissertations
Electromagnetic band gap (EBG) structure with novel meandered lines for mitigation of simultaneous switching noise (SSN) from multiple switch mode power supplies on a high speed digital circuit card assembly is investigated. The electromagnetic band gap structure is designed for a wideband operation from 200 MHz to 15 GHz. The application interest for this planar structure can be used as high impedance surfaces to suppress EMI noise for EMC compliance in Mil-Std-461, which is an electromagnetic compatibility standard for military equipment operating in the frequency range from 10 KHz to 18 GHz. ANSYS HFSS was used for simulation of these …
Hybrid Phonon Polaritons Mimic Te Surface Wave Enhanced Supercoupling, Delroy Dominic Rebello
Hybrid Phonon Polaritons Mimic Te Surface Wave Enhanced Supercoupling, Delroy Dominic Rebello
Theses and Dissertations
The study and excitation of surface plasmon polaritons SPhPs modes in polar dielectrics have attracted the interest of a wide range of research in various fields such as biology, physics and engineering. The excitation of SPhP in optical waveguides is because of TM-component of the incident light. TE-components are usually disbarred because, for TE-polarization component, orthogonal to the TM-polarization components, of the incidence waves, no SPhP mode exists. This thesis presents a novel hybrid TE SPhP mode waveguide in the mid-infrared region. By introducing a thin layer of high index dielectric material on the polar dielectric, where SPhPs are excited, …
Optical Nanoantenna Impedance Matching And Duality And Hybrid Surface Phononic Waveguide, Yuancheng Xu
Optical Nanoantenna Impedance Matching And Duality And Hybrid Surface Phononic Waveguide, Yuancheng Xu
Theses and Dissertations
This work contributes to critical requirements for optical and infrared nanoantenna and waveguide applications; 1) the impedance of an optical nanoantenna is addressed, and 2) long propagation lengths and high confinement waveguide is designed. Optical nanoantennas have been studied as a means to manipulate nanoscale fields, local field enhancements, radiative rates, and emissive directional control. However, a fundamental function of antennas, the transfer of power between a coupled load and far-field radiation, has seen limited development in optical antennas owing largely to the inherent challenges of extracting impedance parameters from fabricated designs. As the transitional element between radiating fields and …
Analysis, A Technique, And Incremental Learning Of Wake-Up-Word Speech Recognition, Ahmad Zuhair S. Hasanain
Analysis, A Technique, And Incremental Learning Of Wake-Up-Word Speech Recognition, Ahmad Zuhair S. Hasanain
Theses and Dissertations
Even thought the cutting-edge speaker-independent Automatic Speech Recognition (ASR) systems demand big training data, they barely handle time-varying speaking rates, tolerate various uttering alterations, or are robust to noise. In contrast, our Wake-Up-Word (WUW) technique is tuned to these challenges in the light ASR systems with minimal number of initial training samples. It is crucial that users of ASR systems be capable of rolling out new WUW calls swiftly and modifying ASR vocabulary at any time, such as in the cases of foreign WUW addition and adaptation to phonetic change. We had tested our proposed methodologies in the acoustic WUW-II …
An Extrinsic Fabry-Perot Interferometric Sensor Using Intermodal Phase Shifting And Demultiplexing Of The Propagating Modes In A Few-Mode Fiber, Julius Chatterjee
An Extrinsic Fabry-Perot Interferometric Sensor Using Intermodal Phase Shifting And Demultiplexing Of The Propagating Modes In A Few-Mode Fiber, Julius Chatterjee
Theses and Dissertations
This dissertation demonstrates a fiber-optic phase shifted Fabry-Perot interferometer (PS-FPI) as a sensor using modal demultiplexing. Single wavelength Fabry-Perot interferometers suffer from fringe ambiguity and loss of sensitivity at fringe extremes. These hindrances cause it to be a secondary choice when being selected for a measurement task at hand, and more often than not, white light based sensors are selected in favor of the single wavelength Fabry-Perot sensors. This work aims to introduce a technique involving the demultiplexing of the propagating linearly polarized (LP) modes in few mode fibers to obtain two fringe systems from the same sensing cavity. This …
Measurement Comparison Of Rf Receivers In Umts 1900mhz, Mohammed Najat Mohammed Sayan
Measurement Comparison Of Rf Receivers In Umts 1900mhz, Mohammed Najat Mohammed Sayan
Theses and Dissertations
In every day engineering practice, drive test systems are used to verify coverage, estimate quality of service and optimize RF network. To accomplish these tasks, drive tests need to be conducted in a systematic and cost efficient way. There are several commercial UMTS drive test systems and they can be classified as high dynamic range, multiband, and phone-based measurement tools. The data obtained from the measurement tools are then analyzed using statistical methods and inference. This thesis presents a detailed and comparative study of some of the physical layer measurements in UMTS 1900MHz frequency band. The collected measurements are compared …
Interpolation Methods For Coverage Area In Cellular Systems, Abdlmagid Mohamed Basere
Interpolation Methods For Coverage Area In Cellular Systems, Abdlmagid Mohamed Basere
Theses and Dissertations
Evaluating the coverage area in a wireless network is very important for cellular system designers in order to provide good service to users. It is hard to collect the Receive Signal Level (RSL) for an entire coverage area because of many obstacles, such as buildings, lakes, and vegetation. Therefore, estimation of the coverage area is essential for locations for which it is difficult to measure the RSL. This dissertation considers the process of RSL interpolation. Two main aspects of the interpolation are considered. Firstly, various interpolation methods are considered and it was determined that a very good performance is obtained …
Specialized Distributed Hardware Design For Real-Time Atmospheric Turbulence Mitigation Error Correction Calculation, Subhadra Subramanian
Specialized Distributed Hardware Design For Real-Time Atmospheric Turbulence Mitigation Error Correction Calculation, Subhadra Subramanian
Theses and Dissertations
This thesis demonstrates an approach to solve execution challenges of Image processing of an Atmospheric turbulence mitigation technique in real-time. An atmospheric turbulence mitigation technique is used to eliminate the aberrations caused by turbulence in the images. The error calculation is a mathematically intensive process, that includes Fast Fourier Transform (FFT) to convert the image from the spatial domain to the spatial frequency domain. The FPGA based hardware accelerator design and architectures are investigated in this work to perform Fast Fourier Transform and error calculations in real-time, defined as 30Hz. A scalable and parallel platform is designed to execute the …
A Robust Speaker Identification Algorithm Based On Atomic Decomposition And Sparse Redundant Dictionary Learning, Thomas James Bryan Jr.
A Robust Speaker Identification Algorithm Based On Atomic Decomposition And Sparse Redundant Dictionary Learning, Thomas James Bryan Jr.
Theses and Dissertations
Speaker identification is performed in high additive white Gaussian noise environments by processing sounds as images in the time-frequency plane. The technique creates audio streams that remove background noise from speech while preserving speech quality. Atomic decomposition is implemented by the matching pursuit algorithm using Gabor or gammatone atomic dictionaries. Gabor atoms were originally proposed as fundamental building blocks of speech; whereas, gammatone atoms closely resemble the human cochlear impulse response. Atomic decomposition creates a sparsely populated time-frequency vector referred to as weight space. The populated positions in weight space have amplitude weights that are proportional to localized energy in …
Analysis Of The Fm Radio Spectrum For Secondary Licensing Of Low-Power Short-Range Cognitive Internet-Of-Things Devices Via Cognitive Radio, Derek Thomas Otermat
Analysis Of The Fm Radio Spectrum For Secondary Licensing Of Low-Power Short-Range Cognitive Internet-Of-Things Devices Via Cognitive Radio, Derek Thomas Otermat
Theses and Dissertations
The number of Internet of Things (IoT) devices is predicated to reach 200 billion by the year 2020. This rapid growth is introducing a new class of low-power short-range wireless devices that require the use of radio spectrum for the exchange of information. To offset this extraneous demand for radio spectrum, the low-power short-range IoT devices need to utilize vacant spectrum through the use of Cognitive Radio (CR). The analysis presented in this dissertation indicates that the FM radio spectrum is underutilized in areas of the continental United States that have a population of 100,000 or less. These locations have …
Angle Of Attack Visualization: A Proposal For A Tangible Interactive In-Flight Loss Of Control Recovery System, Nicholas Kasdaglis
Angle Of Attack Visualization: A Proposal For A Tangible Interactive In-Flight Loss Of Control Recovery System, Nicholas Kasdaglis
Theses and Dissertations
The Trajectory Recovery System (TRS) is a proposed system that will help a pilot quickly restore the aircraft to controlled flight. In-flight Loss of Control (I-LOC) is the leading cause of aviation fatalities. While attempts to address this threat have mainly focused upon prevention and avoidance, there has been little offered for recovery from an I-LOC event. The work presented herein addresses this gap. Offered here will be a Human- Centered Design (HCD) solution to the problem of I-LOC. The TRS is a real-world application arising from robust multi-agent models of human-automation teaming. The use of such models transforms cognitive …
Contribution To T He Onboard Context Sensitive Information System ( Of Commercial Aircraft, Wei Tan
Contribution To T He Onboard Context Sensitive Information System ( Of Commercial Aircraft, Wei Tan
Theses and Dissertations
Pilots currently use paper-based documentation and electronic systems (e.g., Electronic Centralized Aircraft Monitor (ECAM) for Airbus, and Engine Indication and Crew Alerting System (EICAS) for Boeing) to help them perform procedures to ensure safety, efficiency and comfort on commercial aircrafts. Management of interconnections among paper-based operational documents can be a challenge for pilots, especially when time pressure is high in normal, abnormal, and emergency situations. This dissertation is a contribution to the design of an Onboard Context-Sensitive Information System (OCSIS). The claim is that the use of contextual information facilitates access to appropriate operational content at the right time either …
Measurement Based Statistical Model For Path Loss Prediction For Relaying Systems Operating In 1900 Mhz Band, Masoud Dao Hamid
Measurement Based Statistical Model For Path Loss Prediction For Relaying Systems Operating In 1900 Mhz Band, Masoud Dao Hamid
Theses and Dissertations
Relays play important role in deployment of Long Term Evolution (LTE) and LTE-Advanced systems. They are used to enhance coverage, throughput and system capacity. The impact of the relay deployment on the network planning has to be modeled so that the above mentioned goals can be achieved. For successful modeling one needs to predict the path loss on the link between an eNodeB and a relay station. The review of literature shows that there is a general shortage of measured data to help empirical understanding of the propagation conditions in relay environment. This dissertation aims at developing empirical path loss …
Holographic-Based Leaky Wave Antennas And Phonon-Enhanced Waveguides For Infrared Applications, Franklin Muriuki Manene
Holographic-Based Leaky Wave Antennas And Phonon-Enhanced Waveguides For Infrared Applications, Franklin Muriuki Manene
Theses and Dissertations
This work contributes to critical requirements for antenna-coupled detection applications: 1) large capture cross section with design control of angular response and 2) long propagation lengths of complex signals. Antenna-coupled detectors for infrared applications provide appreciable capture cross sections while delivering signals to sub-wavelength-sized detectors. In this work, leaky-wave antennas are considered for the first time in the infrared spectrum. Design characterization of angular radiation patterns as well as polarization is presented. While leaky-wave antennas hold great promise for enhancing capture cross section, thus narrowing the field of view of the detector, there is a parallel need to preserve coherent …
Resonant Coupling Of An Infrared Metasurface With Pmma, Michael Francis Finch
Resonant Coupling Of An Infrared Metasurface With Pmma, Michael Francis Finch
Theses and Dissertations
Resonance coupling between a metasurface or planar metamaterial and PMMA’s, polymethyl methacrylate, phonon resonance corresponding to the C=O molecular bond at 1733 cm-1 (52 THz) is investigated. Two metasurfaces, nano rod and nano slot, are modeled using ANSYS HFSS and measured material optical properties for gold and PMMA in inferred spectrum. Both metasurfaces exhibited normal mode splitting also known as avoidance crossing, quantum level repulsion, or vacuum Rabi splitting. Normal mode splitting is shown to be a result of coupling between the PMMA phonon resonance and the resonance of the metasurface. Analytical models, which are tied to physical descriptions, are …
Infrared Leaky Wave Antenna Coupled Bolometer, Navaneeth Premkumar
Infrared Leaky Wave Antenna Coupled Bolometer, Navaneeth Premkumar
Theses and Dissertations
A four-element infrared leaky-wave antenna coupled bolometer was investigated with the goal of characterizing signal extraction as a long wave infrared (LWIR) detector. Simulations were carried out using Ansys HFSS. Various simple loading techniques were seen and their behavior characterized. A transmission line loaded antenna coupled bolometer was investigated using an incident-wave excitation and angle of sensing inaccuracies were observed. A position pertaining to the design criterion of angular scanning in frequency was then parametrically tuned for. The leaky-wave antenna was then simulated in the transmitting scenario. A waveport fed case was explored and far-field pattern generated. Transmission line losses …