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Articles 4861 - 4890 of 11510
Full-Text Articles in Engineering
Gpu Implementation Of Data-Aided Equalizers, Jeffrey Thomas Ravert
Gpu Implementation Of Data-Aided Equalizers, Jeffrey Thomas Ravert
Theses and Dissertations
Multipath is one of the dominant causes for link loss in aeronautical telemetry. Equalizers have been studied to combat multipath interference in aeronautical telemetry. Blind equalizers are currently being used with SOQPSK-TG. The Preamble Assisted Equalization (PAQ) project studied data-aided equalizers with SOQPSK-TG. PAQ compares, side-by-side, no equalization, blind equalization, and five data-aided equalization algorithms: ZF, MMSE, MMSE-initialized CMA, and frequency domain equalization. This thesis describes the GPU implementation of data-aided equalizer algorithms. Static lab tests, performed with channel and noise emulators, showed that the MMSE, ZF, and FDE1 show the best and most consistent performance.
Modeling Three Dimensional Ground Reaction Force Using Nanocomposite Piezoresponsive Foam Sensors, Parker Gary Rosquist
Modeling Three Dimensional Ground Reaction Force Using Nanocomposite Piezoresponsive Foam Sensors, Parker Gary Rosquist
Theses and Dissertations
Three dimensional (3D) ground reaction force (GRF) are an essential component for gait analysis. Current methods for measuring 3D GRF involve using a stationary force plate embedded in the ground, which captures the forces as subjects walk across the platform. This approach has several limitations, a few being: it can only capture a few steps at a time, it is expensive to purchase and maintain, it can't reflect forces caused by natural uneven surfaces, etc. Previous research has attempted to develop wearable force sensors to overcome these problems; however, these endeavors have resulted in devices that are expensive, bulky, and …
Integration Of A Complete Detect And Avoid System For Small Unmanned Aircraft Systems, Jared Kevin Wikle
Integration Of A Complete Detect And Avoid System For Small Unmanned Aircraft Systems, Jared Kevin Wikle
Theses and Dissertations
For unmanned aircraft systems to gain full access to the National Airspace System (NAS), they must have the capability to detect and avoid other aircraft. This research focuses on the development of a detect-and-avoid (DAA) system for small unmanned aircraft systems. To safely avoid another aircraft, an unmanned aircraft must detect the intruder aircraft with ample time and distance. Two analytical methods for finding the minimum detection range needed are described. The first method, time-based geometric velocity vectors (TGVV), includes the bank-angle dynamics of the ownship while the second, geometric velocity vectors (GVV), assumes an instantaneous bank-angle maneuver. The solution …
Evaluating A Personal Stress Monitoring System, Sneha Gogineni
Evaluating A Personal Stress Monitoring System, Sneha Gogineni
Theses and Dissertations
Now-a-days, Life is generally much more stressful than in the past. "Stress" is the word that we use when we feel that we are overloaded mentally in our thoughts and wonder whether we can really cope with those placed upon us. Sometimes, stress gets us going and they are good for us but at other times, it could be the cause to undermine both our mental and physical health. The way we respond to a challenge can be considered as a kind of stress. Part of our response to a challenge is physiological and affects our own physical state. When …
Discrete Element Analysis Of Scb Variability: Asphalt Mixtures, David Saul Renteria
Discrete Element Analysis Of Scb Variability: Asphalt Mixtures, David Saul Renteria
Theses and Dissertations
The Semi-Circular Bending (SCB) test was modeled using the Discrete Element Method (DEM) implemented in numerical software Particle Flow Code (PFC). The fracture analysis of the SCB was studied using two mixtures gradation, Superpave and Coarse Matrix High Binder. The aggregate phase in the model was achieved by using two-dimensional aggregate images with different angularity indexes. The study of the variability of the SCB extends to the random generation of aggregate particles and air voids in the model, in addition to changing the properties at the interface between the aggregate and mastic phases. Results indicate the strong influence of the …
Multidisciplinary Shape Optimization Of A Composite Blended Wing Body Aircraft, Charles Maxwell Boozer
Multidisciplinary Shape Optimization Of A Composite Blended Wing Body Aircraft, Charles Maxwell Boozer
Theses and Dissertations
A multidisciplinary shape optimization tool coupling aerodynamics, structure, and performance was developed for battery powered aircraft. Utilizing high-fidelity computational fluid dynamics analysis tools and a structural wing weight tool, coupled based on the multidisciplinary feasible optimization architecture; aircraft geometry is modified in the optimization of the aircraft’s range or endurance. The developed tool is applied to three geometries: a hybrid blended wing body, delta wing UAS, the ONERA M6 wing, and a modified ONERA M6 wing. First, the optimization problem is presented with the objective function, constraints, and design vector. Next, the tool’s architecture and the analysis tools that are …
Symbol Salience Affects Change Detection Performance In General Aviation Weather Displays, Adam A. Hruszczyk
Symbol Salience Affects Change Detection Performance In General Aviation Weather Displays, Adam A. Hruszczyk
Theses and Dissertations
General aviation pilots perform many tasks during a flight such as navigating a route, performing 'see and avoid', operating the radio and navigational instruments, viewing charts and approach plates, and scanning and interpreting their flight instruments. In addition to these tasks, pilots may utilize a cockpit weather presentation to monitor weather information for areas along the route of flight. Due to the complexity of most modern weather displays, information changes may go unnoticed. The objective of this study was to examine how saliency characteristics such as line color, thickness, and orientation affected an observer’s change detection performance and response time. …
Exploring Usability In Web-Based Aviation Weather: An Assessment Of The Aviation Weather Center Website, Benjamin Remy
Exploring Usability In Web-Based Aviation Weather: An Assessment Of The Aviation Weather Center Website, Benjamin Remy
Theses and Dissertations
To provide a starting point for usability research in the area of online aviation weather, we performed a two-part usability study of the popular Aviation Weather Center website for general aviation users. The first part of the study utilized the System Usability Scale to examine different types of weather information as used by a general aviation pilot on a VFR cross-country flight and compare the usability of the information to an existing benchmark. No scores were significantly less than the benchmark, but the ordering of weather information by usability score provided valuable insight into the relationship between usability and pilot …
The Effects Of Laser Eye Protection On Color Recognition And Discrimination, Sherisse Melanie Pierre
The Effects Of Laser Eye Protection On Color Recognition And Discrimination, Sherisse Melanie Pierre
Theses and Dissertations
The number of reported laser strikes on aircraft has increased over the years. Laser strikes pose a threat to safety and thus, warrant attention and mitigation efforts. Laser Eye Protection (LEP) is one mitigation method available to pilots; however, LEP can affect a person’s color vision. When wearing the LEP pilots should be able to retain sufficient color recognition and discrimination abilities. This exploratory study investigates the effect of LEP on color recognition and discrimination of four colors, red, blue, green, and amber, using a sample of 90 participants. When using the LEP the majority of participants were able to …
Single Waypoint Zem/Zev Based Closed-Loop Controller Design For Rendezvous With A Rotating Target, Armando Alvarez Rolins
Single Waypoint Zem/Zev Based Closed-Loop Controller Design For Rendezvous With A Rotating Target, Armando Alvarez Rolins
Theses and Dissertations
The research presented in this thesis addresses a very specific kind of autonomous rendezvous procedure between two spacecraft in close proximity, namely that in which the chaser object is attempting to dock at a location on a rotating target which is tracing a circle perpendicular to the axis of rotation. The approaches that have been mentioned in literature which focus on this specific condition make use of offline optimization algorithms to plot the trajectory of the chaser and use closed-loop control to follow that trajectory. This method is computationally demanding and does not allow for feedback in the desired boundary …
Takeoff And Landing Distance Measurement: An Evaluation Of Laser Altimetry For The Collection Of Absolute Aircraft Altitude, Christopher John Kennedy
Takeoff And Landing Distance Measurement: An Evaluation Of Laser Altimetry For The Collection Of Absolute Aircraft Altitude, Christopher John Kennedy
Theses and Dissertations
The measurement of takeoff and landing distance during flight testing of general aviation aircraft requires the accurate measurement of aircraft position over the ground and altitude up to 50 feet above surface elevation. Current methods of evaluating takeoff and landing distances include cinetheodolites, laser and radar trackers, and Differential Global Positioning Systems (DGPS). The use of laser altimetry to range altitude above the ground originated with military and agricultural aircraft. The AgLaser laser module was an infrared laser ranging unit designed for agricultural aircraft to gauge optimal spray height above a field. The AgLaser system has a stated accuracy of …
Assessing The Effects Of Sensitizing Tungsten Oxide With Zinc Telluride, Chengeto Kazuva
Assessing The Effects Of Sensitizing Tungsten Oxide With Zinc Telluride, Chengeto Kazuva
Theses and Dissertations
This thesis is a comparison study of the performance of plain tungsten oxide (WO₃) thin films and tungsten oxide thin films sensitized with zinc telluride (ZnTe) as photoelectrocatalysts. Tungsten oxide and zinc telluride are semiconductors which were prepared on indium tin oxide (ITO) coated glass, and subsequently studied for water splitting applications. The main method of synthesis employed was electrochemical deposition. Tungsten oxide thin films were deposited from a precursor solution of peroxotungstic acid while the zinc telluride thin films were deposited from a solution containing dissolved zinc sulfate heptahydrate, sulfuric acid and tellurium dioxide. Surface morphology, film composition and …
Synthesis And Characterization Of 3-D Tissue Engineered Tumor Models For Melanoma Study And Extracellular Matrix Investigation, Joseph L. Spano
Synthesis And Characterization Of 3-D Tissue Engineered Tumor Models For Melanoma Study And Extracellular Matrix Investigation, Joseph L. Spano
Theses and Dissertations
Introduction: Melanoma is the deadliest form of skin cancer, projected to claim over 9,700 American lives and necessitate $3.3 billion in care and treatment costs in 2017. In order to reduce the socioeconomic burdens and lessen cancer-related mortality and morbidity, advancements in early-stage diagnostics and treatments are essential. Two-dimensional (2-D) tissue culture treated plastics (TCTP) are reductionist in vitro models that are commonly used in drug development and preclinical drug evaluation. These models poorly recapture the native tumor microenvironment (TME), providing unrealistic growth conditions, and are thus poorly suited to measure the efficacy of newly emerging therapies. We have developed …
Pegda Pouches To Prevent Adhesions With In Vivo Bioreactor- Based Vascular Graft Strategies, Kranthi Vuppuluri
Pegda Pouches To Prevent Adhesions With In Vivo Bioreactor- Based Vascular Graft Strategies, Kranthi Vuppuluri
Theses and Dissertations
Different strategies have been investigated for the fabrication of vascular grafts. Using the peritoneal cavity of the patient as an “in vivo bioreactor” to recruit autologous cells to the implanted vascular conduit is one of the promising options. One of the main drawbacks with this strategy is the potential to form adhesions in the peritoneal cavity. In this project we are trying to address this potential side-effect by using polyethylene (glycol) diacrylate (PEGDA) to produce a hydrogel pouch into which the electrospun conduits are placed, with the goal of reducing the potential to form peritoneal adhesion after implantation. PEG is …
Repeatability Of Reference Signal Received Power Measurements In Lte Networks, Hayder A Abdulrasool Khzaali
Repeatability Of Reference Signal Received Power Measurements In Lte Networks, Hayder A Abdulrasool Khzaali
Theses and Dissertations
No abstract provided.
Low Complexity Transmission Schemes For Future Wireless Communication Systems, Geamel Alyami
Low Complexity Transmission Schemes For Future Wireless Communication Systems, Geamel Alyami
Theses and Dissertations
Future of mobile communication technologies is coupled with multi-antenna systems. Recent research results encourage a massive increase in the number of base station antenna elements in order to meet high data rate demands. However, at the current mobile communication frequencies (< 6 GHz), the amount of spectrum is very limited. Therefore, increase number of antenna elements and higher carrier frequencies in millimeter wavelength range need to be understood and their corresponding potentials need to be identified. Studies proposed in this work aim to identify the degree of orthogonality of millimeter wave massive MIMO channels. For this purpose, various simulation based experiments have been done which are based on the state of the art millimeter channel models. Effect of certain propagation parameters such as the probability of existence of LOS link, number of clusters, inter-antenna elements spacing and number of base station antennas in the array have been investigated. It has been found that probability of LOS link has the highest impact at the multiuser orthogonality of the multiuser channels. In general, millimeter wave massive MIMO channels are found to be low rank. Therefore, in the last part of this work a low complexity user selection algorithm is proposed. Novelty of the work is established by both performance and computational complexity comparison. Computational cost of the proposed algorithm is significantly lower than state of the art user algorithms while the sum rate performance is exactly the same as that of best user selection algorithm
Arabic Speech Recognition Systems, Hamda M. M. Eljagmani
Arabic Speech Recognition Systems, Hamda M. M. Eljagmani
Theses and Dissertations
Arabic automatic speech recognition is one of the difficult topics of current speech recognition research field. Its difficulty lies on rarity of researches related to Arabic speech recognition and the data available to do the experiments. Moreover, to build Arabic speech recognition system with an optimal word error rate (WER), the system has to be completely trained to the individual user. Even though speaker dependent system can effectively achieve this by training it explicitly for this one speaker, it requires a large amount of training data. In addition speaker dependent system requires to be trained to each speaker individually. For …
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 …
Dynamics Of Asymmetrical Configurations Of Catamaran Hull Forms, Vaibhav Aribenchi
Dynamics Of Asymmetrical Configurations Of Catamaran Hull Forms, Vaibhav Aribenchi
Theses and Dissertations
It is important to understand asymmetrical catamarans motions since it influences the loads which increases stress on structures while causing discomfort to passengers and crew members. Researchers so far have been mainly focused on motions characteristics of the conventional catamaran hull forms. There is scant literature or research work in the public domain on asymmetrical catamaran hull form, with regards to its seakeeping performance. This thesis undertakes a comparative analysis of the motion characteristics between newly developed alternative catamaran hull forms of different asymmetrical configurations. The asymmetrical catamarans developed from the original NPL round bilge catamaran hull forms have a …
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 …
Estimation Of Groundwater Loads Into A Coastal Estuary Using Seawat, Antonio S. Berber Jr.
Estimation Of Groundwater Loads Into A Coastal Estuary Using Seawat, Antonio S. Berber Jr.
Theses and Dissertations
The research of regional groundwater flow is of vital importance at the Indian River Lagoon (IRL) due to the potential contribution groundwater flow has on nutrients into the IRL. If too many nutrients are introduced into the IRL, algal blooms could occur and impact the health of IRL system. The IRL is a coastal estuary located on the east coast of Florida. Submarine groundwater seepages (SGD) and groundwater loads into the IRL were numerically estimated by using SEAWAT, a program designed to simulate variable-density groundwater flow coupled with multi-species solute transport. Models were completed at three different study transects that …
An Empirical Examination Of Cognitive Chunking And Information Generation In Freehand Sketches During Design Ideation, Omar Magdy Ibrahim Zaki Mohammed Galil
An Empirical Examination Of Cognitive Chunking And Information Generation In Freehand Sketches During Design Ideation, Omar Magdy Ibrahim Zaki Mohammed Galil
Theses and Dissertations
This thesis proposes a method to measure information content of freehand sketches during design ideation based on the cognitive chunk formation. The research is broken down into two phases. The first is a protocol study to explore chunk formation in freehand sketches by novice designers while generating solutions for a novel design problem. The second is the identification of entities and functional relations explicitly expressed in the designers’ output. Next, a form neutral (F-ER) representation model is formulated, and information metrics are applied to measure the information content. This work is motivated by the notion that engineering design can be …
Dynamic Anchoring In Soft Regolith For Celestial Exploration, Tom Ebert
Dynamic Anchoring In Soft Regolith For Celestial Exploration, Tom Ebert
Theses and Dissertations
Recent exploration missions to celestial bodies have shown an increasing demand for surface based landers and rovers designed to perform experiments on the ground, rather than relying purely on traditional orbiting observatories. Many of the scientifically interesting locations have proven hazardous and difficult to reach and traverse, driving the need for different methods of locomotion. Some of these locations lie in deep, permanently shadowed craters or in rocky, highly uneven landscapes. Various wheeled, flying, jumping and legged rovers have been proposed, some of which have been implemented with success and problems alike. Even though the Curiosity rover has the largest …
Multipath Channel Considerations In Aeronautical Telemetry, Edem Coffie Gagakuma
Multipath Channel Considerations In Aeronautical Telemetry, Edem Coffie Gagakuma
Theses and Dissertations
This thesis describes the use of scattering functions to characterize time-varying multipath radio channels. Channel Impulse responses were measured at Edwards Air Force Base (EAFB) and scattering functions generated from the impulse response data. From the scattering functions we compute the corresponding Doppler power spectrum and multipath intensity profile. These functions completely characterize the signal delay and the time varying nature of the channel in question and are used by systems engineers to design reliable communications links. We observe from our results that flight paths with ample reflectors exhibit significant multipath events. We also examine the bit error rate (BER) …
Casimir And Van Der Waals Effects On Electrostatically Actuated Nems Resonator Sensors, Christian Reyes
Casimir And Van Der Waals Effects On Electrostatically Actuated Nems Resonator Sensors, Christian Reyes
Theses and Dissertations
The behavior of nano and micro-electromechanical systems (N/MEMS) cantilever beams under electrostatic actuation is studied. The cantilever system is actuated by soft AC voltage that is set to a frequency of near half natural and near natural frequency of the beam. These actuating frequencies result in primary and parametric resonances, respectively. Two methods are used to analytically model the behavior of the cantilever. The first method is Method of Multiple Scales (MMS), which is a perturbation method that works for small parameters. The second method is the Reduced Order Method (ROM), which is a Galerkin method that works for large …
Design And Implementation Of A Pid Controller For The Low-Speed Wind Tunnel, Carlos F. Vasquez
Design And Implementation Of A Pid Controller For The Low-Speed Wind Tunnel, Carlos F. Vasquez
Theses and Dissertations
The purpose of this research is to investigate the implementation of an external PID controller on an existing variable frequency motor drive (VFD) while using MODBUS communication to read/write data from a LabVIEW station. LabVIEW is the chosen user interface and programming language. It allows human-machine interfacing for the collecting, displaying of information, and automation of the system. The main objective was to develop a new controller to facilitate the operation of the wind tunnel. The current setup makes the operator set the motor frequency manually which then correlates to a test section wind velocity. This involved a calibration period …
Bird's Eye View: Cooperative Exploration By Ugv And Uav, Shannon Hood
Bird's Eye View: Cooperative Exploration By Ugv And Uav, Shannon Hood
Theses and Dissertations
This paper proposes a solution to the problem of cooperative exploration using an Unmanned Ground Vehicle (UGV) and an Unmanned Aerial Vehicle (UAV). More specifically, the UGV navigates through the free space, and the UAV provides enhanced situational awareness via its higher vantage point. The motivating application is search and rescue in a damaged building. A camera atop the UGV is used to track a fiducial tag on the underside of the UAV, allowing the UAV to maintain a fixed pose relative to the UGV. Furthermore, the UAV uses its front facing camera to provide a birds-eye-view to the remote …
Dynamic Model And Control Of Quadrotor In The Presence Of Uncertainties, Courage Agho
Dynamic Model And Control Of Quadrotor In The Presence Of Uncertainties, Courage Agho
Theses and Dissertations
This thesis considers the control of quadrotor using a linear PID control and ℒ1 adaptive control. In a justifiable concept, PID controller can be used to control a quadrotor, but in the presence of uncertainties or disturbance, the quadrotor can’t be automatically adjusted to control the changing dynamics of the quadrotor. To solve the problem associated with uncertainties, various control methodology can be used for controlling the changing dynamic of quadrotor, but in this thesis, ℒ1 adaptive control is used because it allows for fast and robust adaptation for desired transient performance in the presence of matched and unmatched uncertainties. …
Computer-Aided Design Integration In Virtual Reality Design Reviews For Improved Interaction With Engineering Models, Ian James Freeman
Computer-Aided Design Integration In Virtual Reality Design Reviews For Improved Interaction With Engineering Models, Ian James Freeman
Theses and Dissertations
Leveraging virtual reality (VR) technology to enhance engineering design reviews has been an area of significant interest for researchers since the advent of modern VR. The ability to interact meaningfully with 3D engineering models in these VR design reviews is an important, though often neglected, capability due to the difficulty of performing data translation between native CAD data and VR compatible file formats. A bi-directional interface was developed between a VR design review environment and a commercial CAD package that streamlines the data translation process. By transmitting both geometric data and selected metadata from the CAD system an improved format …