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Articles 61 - 90 of 370
Full-Text Articles in Electrical and Computer Engineering
Surface Phonon Polariton-Enhanced Ring Resonator And E-Plane Hybrid Ring Coupler, Cláudio Augusto Barreto Saunders Filho
Surface Phonon Polariton-Enhanced Ring Resonator And E-Plane Hybrid Ring Coupler, Cláudio Augusto Barreto Saunders Filho
Theses and Dissertations
Surface polaritons are known for providing the ability to confine light beyond the Abbe’s limit of diffraction. While metals efficiently support surface plasmon polaritons in the visible-UV spectrum, some semiconductors can support surface phonon polaritons in the infrared. Ring resonators are devices with high integration level with optical interconnects and with applications including filters, directional couplers, modulators and interferometers. Loss associated to ring curvature yields ring radius on the order of tens of free-space wavelengths. SPhP-enhanced micro-ring resonator was proposed and it was shown that ring dimensions are reduced. Advances in nanofabrication processes allow the design of optical interconnects using …
Integrating A Modified Pulse Amplitude Modulation (Pam4) Scheme With Two Spatially Multiplexed Channels In Optical Fiber Communication Systems, Bilas Chowdhury
Integrating A Modified Pulse Amplitude Modulation (Pam4) Scheme With Two Spatially Multiplexed Channels In Optical Fiber Communication Systems, Bilas Chowdhury
Theses and Dissertations
A multi-input multi-output (MIMO) based optical fiber multiplexing architecture known as Spatial Domain Multiplexing (SDM) adds a new dimension to optical fiber communication systems by spatially reusing the optical frequencies. SDM allocates different spatial location for different input signals based on the input launch angles. These input signals propagate helically inside the carrier fiber. They abide total internal reflection and exit as concentric donut shaped rings while travelling the fiber. These SDM channels do not exhibit any crosstalk or intersymbol interference. SDM systems can also complement different modulation techniques such as Return to Zero (RZ), Non-Return to Zero (NRZ), and …
Unified Model Combining The Boundary Conditions Encountered At The Input, The Carrier Optical Fiber And The Output In Spatially Multiplexed Optical Communication Channels, Gregory Lewis Lovell
Unified Model Combining The Boundary Conditions Encountered At The Input, The Carrier Optical Fiber And The Output In Spatially Multiplexed Optical Communication Channels, Gregory Lewis Lovell
Theses and Dissertations
Spatial domain multiplexing allows for expansion of optical fiber data rates by utilizing the spatial dimensions within the fiber. One form of this multiplexing method utilizes oblique input angles to generate ring-like spatial modes within the optical fiber core. This radial based spatial multiplexing (rSDM) is compatible with single core fibers and conventional optical fiber systems. As rSDM has been shown to be independent of wavelength, rSDM channels allow for adaption of wavelength division multiplexing, and has been experimentally shown to be capable of improving optical fiber data rates by at least an order of magnitude. Current research into rSDM …
Geo-Locating Ues Using Multi-Output Decision Tree Regressor, Edel Goreil Dawood
Geo-Locating Ues Using Multi-Output Decision Tree Regressor, Edel Goreil Dawood
Theses and Dissertations
Mobile communication networks constantly need to monitor and improve the quality of service and network coverage to their users, and to do so, radio measurements are required. One common method for gathering these measurements is Drive Tests (DT) in which vehicles equipped with measuring devices are sent to locations of interests. However, DT has several limitations one of which is that DT cannot be performed on indoor locations. Other approaches were later used; however, failed to prove a considerably higher efficiency. To address this need, mobile operators developed a standardized technique called Minimization of Drive Test (MDT) that take advantage …
Ue Based Performance Evaluation Of 4g Lte Network, Hazza Saif Saeed Alshamisi
Ue Based Performance Evaluation Of 4g Lte Network, Hazza Saif Saeed Alshamisi
Theses and Dissertations
In the past ten years, we have witnessed an increase in demand for mobile services as we have come to depend more and more on mobile phones as an indispensable part of everyday life. And not merely for making phone calls or sending text messages, but also for services such as games, mobile banking, streaming videos and making video calls. These mobile applications consume far more data than simple voice calls. Reflecting what an end user experiences when using a mobile device is an aspect that has not yet been properly catered for. The LTENetScan framework introduced a novel method …
Calibration Of The Rapidscat Microwave Brightness Temperature, Ali Al-Sabbagh
Calibration Of The Rapidscat Microwave Brightness Temperature, Ali Al-Sabbagh
Theses and Dissertations
NASA RapidScat is the first satellite scatterometer that flown in non-Sun-synchronous orbit. Its unique orbit enabled collocated measurements with multiple satellite remote-sensing instruments that usually fly in Sun-synchronous orbits. RapidScat’s primary mission was retrieval of global ocean wind vectors from normalized radar backscatter measurements. The instrument operated onboard the International Space Station between September 2014 and August 2016 covering latitude range between ±51.6ᵒ . To serve as a cross-calibration reference with other instruments, RapidScat must be internally calibrated. This dissertation presents the first radiometric calibration of RapidScat brightness temperature measurements and describes the process that combines RapidScat’s active/passive mode, simultaneously …
A Sensor Fusion And Machine Learning Approach For Predicting Signal Power Path Loss In Wireless Communications, Yunus Egi
Theses and Dissertations
When it comes to Wireless Communication systems and their optimization in different environments, estimation of SPPL for different terrain models becomes one of the most tedious problems for Radio Frequency engineers. Since every terrain has their complex terrain structures and contains micro-variations, they end up with an ambiguous SPPL via scattering and absorption. Also, modern SPPL prediction models are error free since they use predefined estimation parameters for classified terrain model. Sometimes, terrain-related estimation errors may cause over undesirable SPPL level which is much larger than 5% tolerance error. To avoid this problem, one can benefit from 3D map of …
Establishing A People Qualification Framework At Embraer Executive Aircraft, Inc., Yassine Rayad
Establishing A People Qualification Framework At Embraer Executive Aircraft, Inc., Yassine Rayad
Theses and Dissertations
Technical training in the aviation industry is a multi-faceted and complex topic. Research efforts in aviation maintenance training are extensive, however, we observe a paucity of studies directly focused on aircraft manufacturing environments. Nevertheless, the recent growth of the training industry and the advent of more disruptive technologies such as virtual and augmented reality solutions are making training program design efforts more and more relevant. The research and design contributions presented in this thesis focus on the establishment of a people qualification framework at a local aircraft final assembly and testing plant in Melbourne, FL. The design thinking cycle was …
Rapidscat Backscatter Measurements Calibration, Ruaa Alsabah
Rapidscat Backscatter Measurements Calibration, Ruaa Alsabah
Theses and Dissertations
Scatterometers are microwave radars deployed to estimate global wind speeds and directions over sea surface by measuring Normalized Radar Cross Section (σᵒ) of the sea. Measured is determined by the sea surface roughness that is modulated mostly by wind, thus establishing a relationship between and wind conditions. Wind vectors are retrieved by inverting an empirical Geophysical Model Function that relates measured to a wind vector (speed and direction) and radar measurement configuration (polarization, incidence, and azimuth angle). Careful scatterometer calibration is required for accurate wind retrieval. RapidScat is a National Aeronautics and Space Administration (NASA) Ku-Band scatterometer that was operated …
Hybrid Long-Range Mid-Infrared Hyperbolic Phonon Polariton Waveguide Using Hexagonal Boron Nitride, Di Xiong
Hybrid Long-Range Mid-Infrared Hyperbolic Phonon Polariton Waveguide Using Hexagonal Boron Nitride, Di Xiong
Theses and Dissertations
For any photonic-on-chip applications long propagation waveguides are critical. The use of plasmon polaritons for near-infrared and optical networks has been extensively studied for the purpose of achieving long propagation lengths, however, due to plasmonic polariton effects being negligible in mid- to long-wave infrared (IR) applications, phonon polaritons are required. In recent years, extensive research has been carried out on hexagonal boron nitride (h-BN), and it has been found that h-BN has naturally occurring sub-range phonon volume-constrained hyperbolic phonon polaritons (HPhPs). The numerical results in this thesis show both the long-range and short-range phonon volume polaritons modes in h-BN. A …
System Level Performance Evaluation Of 60 Ghz Downlink Under Different Beamforming And Scheduling Methods, Monera Elhashmi M Salah
System Level Performance Evaluation Of 60 Ghz Downlink Under Different Beamforming And Scheduling Methods, Monera Elhashmi M Salah
Theses and Dissertations
The research in millimeter-wave (mm-wave) area is of special interest to the upcoming fifth generation (5G) communications. The 60 GHz band is one of the most attractive 5G bands. That is due to the abundantly available spectrum, higher achievable throughput, and lower latency when compared to the conventional 4G bands. This research addresses the 60 GHz system level performance evaluation for cellular downlink transmission in an outdoor environment. Using a custom system level simulator, different parameters associated with the mm-wave communication system are predicted. These parameters include path loss (PL), signal-to-noiseplus-interference-ratio (SINR), number of antenna elements and several arrays implementations. …
A Queueing Theory-Based Modeling And Performance Analysis Of Push-To- Talk Over Cellular Networks, Hisham Zorghani
A Queueing Theory-Based Modeling And Performance Analysis Of Push-To- Talk Over Cellular Networks, Hisham Zorghani
Theses and Dissertations
Public Safety organizations play a vital role in emergencies. Their ultimate goal is to protect people and save lives and properties during disasters. Public safety communities have been using narrowband Trunking systems for their communications for decades. These systems were designed with only voice communications in mind. Even though these narrowband systems have gone throughout many enhancement phases, yet their data capabilities are still limited. Long Term Evolution (LTE) has been selected by many countries including the United States to be the platform for next-generation Public Safety Networks(PSN). The 3GPP LTE standard is all-IP architecture mainly developed to boost its …
An Efficient Low Voltage Dc Microgrid With Power Array Conversion For Commercial Buildings, Zhiqing Wu
An Efficient Low Voltage Dc Microgrid With Power Array Conversion For Commercial Buildings, Zhiqing Wu
Theses and Dissertations
PV solar energy is becoming increasingly more prevalent in electricity generation for residential and commercial buildings. Since PV solar directly supplies DC power, a DC microgrid is an ideal platform for PV energy resource in building applications. Existing DC power converters typically have low power conversion efficiency at light and heavy load conditions. Much research has been done on efficiency improvement of DC converters, but material, technology, and manufacturing processes all impose limitations on efficiency gain. This paper addresses the efficiency improvement of a DC microgrid with a power array conversion (PAC) for a commercial building application. The PAC configuration …
Cloud Based Wireless Sensor Monitoring, Pruthvi Devendrakumar Mistry
Cloud Based Wireless Sensor Monitoring, Pruthvi Devendrakumar Mistry
Theses and Dissertations
Internet of Things (IoT) brought a revolutionary change in embedded systems. It offloads the physical work of managing an equipment, appliance or device to a smart and network connected application. IoT makes it possible to monitor and control a huge network of devices remotely. The aim of this project is to develop a complete framework for smart data acquisition from a wireless sensor network to cloud servers. The framework includes configurable, low power, and small size embedded module that is attached to a sensor. The device reads data from the sensor and forwards them to the cloud server using the …
Human-Centered Design Of The Enhanced Pilot Learning Interface For The Aviation Community, De Vere Michael Kiss
Human-Centered Design Of The Enhanced Pilot Learning Interface For The Aviation Community, De Vere Michael Kiss
Theses and Dissertations
he purpose of this research is to introduce a new device to help pilots navigate aircraft manuals. This informational navigational tool is designed to improve learning by reducing the time it takes a pilot candidate to retrieve aircraft system information within an aircraft manual. The device is called the Enhanced Pilot Learning Interface, an Advanced Interactive Media. The research project is based on human-centered design and consists of participatory design, modeling and simulation, human-in-the-loop simulation (HITLS), and expert user experience. Additionally, a traditional research experimentation was conducted to collect supporting statistical data. Preliminary tests of four current professional airline pilots …
An Approach To Improve Single Photon Detectors For Highly Sensitive Applications, Ahmed Chyad Kadhim
An Approach To Improve Single Photon Detectors For Highly Sensitive Applications, Ahmed Chyad Kadhim
Theses and Dissertations
The problem of detecting a single photon is receiving considerable attention with the development of new single photon detectors in biophotonics, stressed free-space optical communication, low probability of intercept (LPI) optical communication, quantum communication, and remote sensing. The theoretical modeling of the waveforms of the single photon detector output produced in particular systems will expedite the search for and analysis of detected signals. Since SNSPDs require cooling to very low temperature, 4K, and PMTs work on the visible wavelength, current photon detection focus on research developing SPADs and using InGaAs/InP materials. However, SPADs can work over the infrared range of …
Phonon Polariton Enhanced Infrared Waveguides, Yuchen Yang
Phonon Polariton Enhanced Infrared Waveguides, Yuchen Yang
Theses and Dissertations
The need for robust, reliable and sensitive terahertz (THz) sources and detectors has motivated the research into waveguiding structures. The increasing adoption of micro- and nanofabricated optical components addresses the critical challenge of guiding light with subwavelength confinement. Surface plasmon polariton (SPP) waveguides are among the most promising candidates for manipulating light on subwavelength scales and harbor many potential applications at visible and nearinfrared (NIR) wavelengths. However, the metal in the waveguide yields very weak or nonexistent response in the mid and long wave infrared range, since metal in this region is very lossy and has large magnitude real and …
Two Channel Sdm Communication System Simultaneously Operating At 10gb/S Using C-Band Transceivers, Han Wang
Two Channel Sdm Communication System Simultaneously Operating At 10gb/S Using C-Band Transceivers, Han Wang
Theses and Dissertations
Increasing the bandwidth of optical fiber communications to cope with high-speed network traffic is an important goal for the communications industry. Therefore, optical communication is growing at a very rapid pace, including the multiplexing technology. Spatial domain multiplexing (SDM), also known as Space division multiplexing, is a Multi-Input Multi-Output (MIMO) architecture that can increase the data carrying capacity of optical fibers by multiple folds. SDM allows multiple channels of same wavelength to be transmitted in parallel over standard multi-mode fibers, where each SDM channel follows a different helical trajectory while traversing the length of the fiber that lead to unique …
Adaptive Spaceship Cockpit Architecture, Ondřej Doule
Adaptive Spaceship Cockpit Architecture, Ondřej Doule
Theses and Dissertations
This research project is focused on a system design theory and practice of the most complex environment that a human-system architect can ever encounter. It is the environment of the spaceship cockpit or cabin that is affected by forces of propulsion and gravity accelerations and freefall while the direction and magnitude of gravity change during the flight. Furthermore, the hyperbaric, restrictive environment of Intra Vehicular Activity spacesuit adds another layer of complexity. In off-nominal or emergency situations, these environmental effects combine, which results in specific human-system interaction requirements. Considering human-system integration requirements on safety, comfort and efficiency of communication between …
An Empirical Path Loss Model For Wireless Sensor Network Deployment In A Library Environment, Thomas John Misilo
An Empirical Path Loss Model For Wireless Sensor Network Deployment In A Library Environment, Thomas John Misilo
Theses and Dissertations
Wireless networks are becoming more commonplace which has necessitated the know-how to optimally place the devices. There have been studies using wireless sensor networks inside of libraries and museums. However, extensive research has not been completed on propagation modeling for use in the library environment. The main aim of this research is to provide a propagation path loss model for a typical library environment, while comparing two types of antennas (wire and small dipole antenna). This research develops path loss models for a peer-to-peer 2.4 GHz system, where both the transmitter and the receiver are located at the same elevated …
Evaluation And Design Improvement Of An Augmentative And Alternative Communication Tool For Children With Autism, Moez Lidinallah Fessi
Evaluation And Design Improvement Of An Augmentative And Alternative Communication Tool For Children With Autism, Moez Lidinallah Fessi
Theses and Dissertations
Autism Spectrum Disorder treatment is a real challenge in our society. In an attempt to manage this, Augmentative and Alternative Communication devices became more and more prevalent in the form of software installed on portable devices such as tablets. These mobile applications help individuals with autism to enhance their communication capabilities. Some of the concerns pertaining to the success these systems are the efficacy and the capability, the ease of use, and the user engagement. The research described in this thesis focuses on the usability of a particular application named Livox. This usability evaluation consisted of a threefold approach: (1) …
Infrared Resonant-Coupled Metamaterial Sensing And Phonon-Polariton-Enhanced Infrared Interconnects, Michael Francis Finch
Infrared Resonant-Coupled Metamaterial Sensing And Phonon-Polariton-Enhanced Infrared Interconnects, Michael Francis Finch
Theses and Dissertations
Coupled-mode theory has been applied to various fields of endeavor from waveguide splitters/combiners and molecular sensing to light-matter interactions. Metamaterials, engineered periodic or aperiodic structures, are employed to sense molecular vibrational fingerprints in the mid to long infrared wavelengths. A metasurface, a 2D metamaterial, can be designed such that it has a resonance at a molecular vibrational frequency. Mode splitting results from the coupling of two electromagnetic field distributions, or modes, spatially and/or temporally. Metamaterial and molecular resonance coupling is a result of near field interaction. Fano resonances have an asymmetric line-shape that results from the coupling of a continuum …
An Advanced Context Aware Operator Support System (Caoss) For Chemical Plant Operation, Sujin Babu Alfred Retna Dhason
An Advanced Context Aware Operator Support System (Caoss) For Chemical Plant Operation, Sujin Babu Alfred Retna Dhason
Theses and Dissertations
Analyzing potential causes for recent industrial accidents and production losses highlights that the majority of these incidents are due to human factor failure: operator error, poor decision-making and violations (Dźwiarek, 2004). In the meantime, the process equipment design, fabrication, metallurgy and control system has improved significantly to combat these unpredictable failures. This research focus on the errors due to human-machine interaction (HMI) in chemical plant. This paper presents an advanced support system for operators in chemical plants, to perform safe and reliable plant operation and maintenance (O&M). In chemical industry, almost every tasks involving human interaction with the machines are …
Helping College Students To Manage Stress: A Human Centered Smartphone Application For Stress Relief, Saad R. Almesalm
Helping College Students To Manage Stress: A Human Centered Smartphone Application For Stress Relief, Saad R. Almesalm
Theses and Dissertations
This dissertation represents a Human Centered Design research to evaluate the perception and handling of stress. To successfully evaluate this research, an iOS smartphone application was developed. This research includes five HCD stages: identify needs, research/analysis, design, evaluation and delivery. The importance of this topic was revealed when we realized that stress can affect students internally and externally. We started with understanding the topic and gathering information about stressed students specifically in college. We created an ontology representing the causes of stress based on previous studies. The ontology includes three main factors: Academic, Social, and Personal/Family stress. In addition, the …
A Subwavelength Perfect Absorbing Metamaterial Patch Array Coupled With A Molecular Resonance, Michael F. Finch, Brian A. Lail
A Subwavelength Perfect Absorbing Metamaterial Patch Array Coupled With A Molecular Resonance, Michael F. Finch, Brian A. Lail
Electrical Engineering and Computer Science Faculty Publications
A perfectly absorbing metamaterial (PAMM) coupled with vibrational modes has varied applications ranging from surface-enhanced vibrational spectroscopy to biological sensing. This endeavor considers a subwavelength PAMM sensor design and analysis using a commercially available finite element method (FEM) solver and analytically with temporal coupled mode theory (TCMT). A carbon double oxygen bond (C=O) at 52 THz or 1733 cm⁻¹ that resides in poly(methyl methacrylate), PMMA, will be used as a stand-in analyte. Normal mode splitting that results from the resonant coupling between the PAMM and analyte’s molecular resonance is investigated and analyzed.
Optimal Transfer Point Locations In Two-Stage Distribution Systems, Jeffrey A. Mcdougall, Luis Daniel Otero
Optimal Transfer Point Locations In Two-Stage Distribution Systems, Jeffrey A. Mcdougall, Luis Daniel Otero
Electrical Engineering and Computer Science Faculty Publications
Limited range of emerging delivery vehicles, speci cally unmanned aerial systems, creates gaps in last mile retail distribution networks and excludes signi cant numbers of potential customers. Implementing a two-stage distribution process is one approach that eliminates this de cit. However, dispatchers must load the vehicles hauling orders in the initial stage of the process and assign orders for delivery to transfer points in a way that ensures timely arrival while utilizing only the minimum required resources. This paper investigates the capacitated transfer point covering problem which has, until now, been unstudied. The research proposes a mathematical programming model to …
Performance Evaluation Of Mission Critical Communications Services Over Lte Networks, Kehinde Olumide Olasupo
Performance Evaluation Of Mission Critical Communications Services Over Lte Networks, Kehinde Olumide Olasupo
Theses and Dissertations
he existing Private/Professional Mobile Radio (PMR) technologies designed specifically for Mission Critical Communication (MCC) systems are narrowband and wideband devices, with limited network data capacity in emergency scenarios. They are majorly used to support MCC voice communications and low data rate applications during mission critical operations. However, the need for broadband systems that would support high radio data capacity keep increasing during major incidents and accident scenarios. Because of this, the MCC agencies were attracted by the broadband capabilities of Long Term Evolution (LTE) technology. But, the uplink capacity of LTE- based MCC systems is still a concern. In planning …
Comparison Of Reference Signal Received Power Measurements Between Cell Phone And Scanning Receiver In Lte, Sahin Gullu
Comparison Of Reference Signal Received Power Measurements Between Cell Phone And Scanning Receiver In Lte, Sahin Gullu
Theses and Dissertations
In cellular technology, before giving service to customers, coverage estimation, network optimization, and maintenance rely on RSRP (Received Signal Reference Power) measurements that are collected in a given area. This measurement collection is called “drive test or drive testing” that is very common practical experiment for RF engineers. These measurements are usually recorded by a professional receiver or a professional phone with appropriate software and license. A scanning receiver, PCTEL SeeGull EX scanning Receiver in this thesis, is a common professional tool for RF engineers to collect data. A cell phone, HTC One M7 for this experiment, has an appropriate …
Efficiency Analysis And Optimization Of Light Trapping In Amorphous Silicon Heterojunction Solar Cell With Lumerical Fdtd/Device, Muhammad Riaz
Efficiency Analysis And Optimization Of Light Trapping In Amorphous Silicon Heterojunction Solar Cell With Lumerical Fdtd/Device, Muhammad Riaz
Theses and Dissertations
This study investigated the two-dimensional computer analysis of a tandem solar cell: c-Si/a-Si:H/µc-SiGe, with Lumerical FDTD/DEVICE 4.6. Optical characterization was performed in FDTD and then the total generation rate was transported into DEVICE for electrical characterization. Electrical characterization of the solar cell was carried out in DEVICE. In the first stage, a single junction solar cell was studied with both a-Si and µc-SiGe, respectively, as its absorbing layers. The thickness for both layers was kept the same. For the a-Si absorbing layer Jsc = 10.959 mA/cm2 , Voc = 696.97 mV, FF = 78.985%, and η = 6.033% were achieved. …
A Compact Energy-Independent Czt-Based Gamma Camera, Youngho Seo, Yonggang Cui, Paul O'Connor, Qiu Huang, Ralph B. James, Debasis Mitra, Hui Pan
A Compact Energy-Independent Czt-Based Gamma Camera, Youngho Seo, Yonggang Cui, Paul O'Connor, Qiu Huang, Ralph B. James, Debasis Mitra, Hui Pan
Electrical Engineering and Computer Science Faculty Publications
Conventional gamma cameras are heavy and occupy large volume for all required hardware components. Direct-conversion solid-state detectors like cadmium zinc telluride (CZT) enable a compact design of gamma cameras. In addition, conventional gamma cameras require different collimators for different gamma-ray photon energies, and the change of collimators between studies sometimes disrupts the workflow. To ease this inconvenience (i.e., bulkiness and collimator change), we have recently developed a compact, CZT-based, energy-independent gamma camera that requires only one collimator to cover a broad range of photon energies. In this paper, we show our design parameters and system specifications as well as simulation …