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Articles 61 - 90 of 91
Full-Text Articles in Engineering
Residence Time Distribution (Rtd) Analysis Of A Bioreactor's External Recirculation Loop For A Tissue Engineering Test Bed, Adrien Hosking
Residence Time Distribution (Rtd) Analysis Of A Bioreactor's External Recirculation Loop For A Tissue Engineering Test Bed, Adrien Hosking
Theses and Dissertations
Currently, in tissue engineering, the focus is on morphing cells into a particular type of tissue by hand, rather than automating the process. Automating cell feeding and waste removal, alone, still requires the removal of cells from their culture to perform imaging and analysis. Without the ability to automate the imaging in a way that does not risk cell death, the advantages of automating the feeding and waste removal are largely lost. By building a fully automated tissue engineering test bed, the capacity for cell reproducibility and cell yield increases significantly. This thesis outlines the design, some initial testing, and …
Hrv - Ecg Generator: Software For Testing Heart Rate Variability Detection, Matthew Joseph Pogorelec
Hrv - Ecg Generator: Software For Testing Heart Rate Variability Detection, Matthew Joseph Pogorelec
Theses and Dissertations
Heart rate variability (HRV) has been shown to serve as an effective diagnostic and prognostic tool in a variety of clinical applications, including for patients who have suffered from myocardial infarction, sepsis and liver cirrhosis. There currently exist a variety of devices and software to quantify HRV based on RR interval series collected from ECG data. However, as the uses for HRV expand, a greater variety of devices for different applications are being designed and developed. Thus, it is useful to have available a method for efficiently testing preliminary software. The HRV/ECG Generator software is designed to build both an …
A Game Theory Motivated Approach To Analyzing Modularity In Automotive Systems, David John Thiess Jr.
A Game Theory Motivated Approach To Analyzing Modularity In Automotive Systems, David John Thiess Jr.
Theses and Dissertations
This paper examines the effect of integrated and modular design on consumers and manufacturers and seeks to determine if there is an optimal design that benefits both. Some consumers perceive the automotive industry to design vehicles with only the company’s benefit in mind, rather than the desires of the consumer. However, the automotive industry seeks to please consumers, while minimizing the cost of production. A game-theoretic based model was developed that was used to determine if there existed a level of modularity for a system that optimized for both the manufacturer and consumer. The game model consisted of two players, …
Acceleration, Braking, And Steering Controller For Polaris Gem E2, Matthew Benton Salfer-Hobbs
Acceleration, Braking, And Steering Controller For Polaris Gem E2, Matthew Benton Salfer-Hobbs
Theses and Dissertations
This paper discusses the design and simulation of lane keeping and velocity controllers for a Polaris GEM e2. The controllers were designed to be implemented in Florida Institute of Technology’s entry for the Intelligent Ground Vehicle Competition self-drive challenge. The software and physical implementation of actuators were included to control the acceleration, braking, and steering. The accelerator pedal was replaced with a set of digitally controlled potentiometers, the brake pedal was replaced with a linear actuator, and the steering column was replaced with a stepper motor. Each actuator was controlled by a Raspberry Pi 3. A sliding mode controller was …
Membrane Hull Technology Implemented Into A D-Collar Work Boat, Joshua Hagan
Membrane Hull Technology Implemented Into A D-Collar Work Boat, Joshua Hagan
Theses and Dissertations
Membrane Hull Technology (MHT) was initially developed for the United States Navy Rigid-Hull Inflatable Boats (RHIB) as an alternative structure design to provide weight savings and shock mitigation. MHT accomplishes this by veering away from traditional hull design and utilizing a grid like system with an increased number of longitudinal stringers and transverse frames with a significantly lower moment of inertia when compared to traditional stringers and bulkheads. The decrease in stiffness allows for increased deflection in the hull during high load events with the added benefit of shock absorption. This technology, developed by Structural Composites Inc., has been successfully …
Feasibility Study And Hydrodynamics Of Transformable Submersible Hydrofoil Trimaran, Yipeng Pan
Feasibility Study And Hydrodynamics Of Transformable Submersible Hydrofoil Trimaran, Yipeng Pan
Theses and Dissertations
It has been the endeavor of naval architects to design innovative hull forms to address the political, socio-economic climate and sustainability around the world. It is imperative that countries be able to protect their sea lanes and coastal zones from surveillance and infiltration from hostile foreign entities. Hence there is a need to develop radically different hull form, which possess the elusive ability and are capable of high-speed. In order to fulfill the idea, the hypothesis envisioned in this thesis is: the Transformable Submersible Hydrofoil Trimaran (TSHT) as an innovative and ground breaking hull form would address the feasibility of …
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 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 …
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 …
Formal Trust Architecture For Assuring Trusted Interactions In The Internet Of Things, Milankumar Patel
Formal Trust Architecture For Assuring Trusted Interactions In The Internet Of Things, Milankumar Patel
Theses and Dissertations
The Internet of Things (IoT) has provided a flexible platform for a large number of heterogeneous devices to dynamically join and leave the network. This enhances the availability of a diverse range of services provided by a network. However, this dynamic expansion of the network with mobile IoT devices introduces a major challenge to security especially related to management of trust across the IoT platforms. Furthermore, IoT is open and distributed in nature, which allows the integration and registration of diverse entities. Thus arises the necessity for a mechanism that can ensure the selection of secure and trusted devices as …
Energy, Exergy And Economic Analysis Of A Micro-Cchp System, Ganesh Vinayak Doiphode
Energy, Exergy And Economic Analysis Of A Micro-Cchp System, Ganesh Vinayak Doiphode
Theses and Dissertations
Combined cooling, heating and power generation (CCHP) systems can be utilized for commercial or multi-family residential buildings as efficient and reliable means to satisfy building power requirements and thermal loads. In the present study, a CCHP system consist of a Bryton cycle, an Organic Rankine cycle (ORC) and an absorption Ammonia-water cycle is considered. A detailed model is developed via MATLAB to assess the performance of the considered cycle from energy, exergy and economic perspectives. Appropriate ranges for inputs are considered and the first law efficiency, second law efficiency and ECOP of the cycle are determined as 77.17%, 33.18% and …
Tuning Of The Zero Dispersion Point For Micro Electrical Mechanical Systems, Rebekah Mercedes Blackwell
Tuning Of The Zero Dispersion Point For Micro Electrical Mechanical Systems, Rebekah Mercedes Blackwell
Theses and Dissertations
Resonant micro-electromechanical systems (MEMS) are increasingly common in applications, including inertial sensors and frequency sources. These devices operate at resonance and take advantage of their size, ability to integrate with electronics, and light damping. The performance of these devices can be improved by operation at higher vibration amplitudes, but they often begin to exhibit frequency shifts near resonance as the amplitude is increased, due to nonlinear stiffness effects. Previous works have sought to balance nonlinearities in order extend the linear dynamic range (LDR) of these resonators. The focus of this thesis is to characterize, for design purposes, another possible operating …
Lateral And Torsional Seismic Vibration Control For Torsionally Irregular Buildings, Osman Akyürek
Lateral And Torsional Seismic Vibration Control For Torsionally Irregular Buildings, Osman Akyürek
Theses and Dissertations
During strong earthquakes or wind gusts, it is likely that buildings with torsional irregularity in the plan have an can be seriously damaged, partially collapsed or fully collapsed. This is because Torsionally Irregular Buildings (TIBs) may have significant aerodynamic torsion loads that increase the eccentricity between the center of mass and the center of rigidity, especially in dominant torsion modes. For this reason, torsion leads to excessive increase in lateral motions when dynamic loads excite the buildings. Torsional irregularity is one of the main failure causes during strong dynamic excitations due to earthquakes or wind gusts. Ignoring torsional irregularity in …
Drone Path Scheduling For Data Gathering In Disaster Effected Environments, James Bologna
Drone Path Scheduling For Data Gathering In Disaster Effected Environments, James Bologna
Theses and Dissertations
Creative networks in a disaster effected area have been a concern for a long time. With the innovation of flying ad hoc networks the problem can be tackled from a more practical standpoint. The use of low altitude drones equipped with wireless transmission and receiving capability can be used under the circumstances to enable ad-hoc communication. Drone coordination and route planning is a critical consideration when determining how to gather data from ground nodes, since the drones are constrained by limited battery capacity. In this research, we set out to explore a wide range of policies for determining the trajectories …
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 …
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. …
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 …
Unmanned Aerial System Integration Into The National Airspace System And Airports: Risk Mitigation Using Content Analysis Methodology, Bhoomin Bhupendrabhai Chauhan
Unmanned Aerial System Integration Into The National Airspace System And Airports: Risk Mitigation Using Content Analysis Methodology, Bhoomin Bhupendrabhai Chauhan
Theses and Dissertations
Over the last few years, the use of unmanned aerial systems (UAS) has significantly increased. With an increase in the use of UASs, the number of UAS sightings near manned aircraft and airports have also increased, as shown by the Federal Aviation Administration (FAA)(FAA, 2019a). Although not every near sighting had a severe consequence associated with it, the risks were still present. As UASs are becoming more readily available to the general public, the risks present due to UASs flying in the National Airspace System (NAS) and near airports is also increasing. For the study, incident and accident reports were …
Study Of A Crew Transfer Vehicle Using Aerocapture For Cycler Based Exploration Of Mars, Larissa Balestrero Machado
Study Of A Crew Transfer Vehicle Using Aerocapture For Cycler Based Exploration Of Mars, Larissa Balestrero Machado
Theses and Dissertations
This thesis presents the results of a conceptual design and aerocapture analysis for a Crew Transfer Vehicle (CTV) designed to carry humans between Earth or Mars and a spacecraft on an Earth-Mars cycler trajectory. The thesis outlines a parametric design model for the Crew Transfer Vehicle and presents concepts for the integration of aerocapture maneuvers within a sustainable cycler architecture. The parametric design study is focused on reducing propellant demand and thus the overall mass of the system and cost of the mission. This is accomplished by using a combination of propulsive and aerodynamic braking for insertion into a low …
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 …
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 …
Taxonomy And Abstraction Of The On-Demand Mobility Aviation System For Smart Cities, Wancheng Dai
Taxonomy And Abstraction Of The On-Demand Mobility Aviation System For Smart Cities, Wancheng Dai
Theses and Dissertations
The on-demand mobility aviation system is a new paradigm providing aircraft-based point-to-point transportation services to travelers in urban and suburban areas. Many consider it as the next revolution in intelligent transportation systems. Since it does not require pre-scheduling and vehicles travel at high speed, travel times are dramatically decreased, which overcomes issues of the current ground transportation system, improves travel times and level of service, increases productivity and creates new business models. Likewise, it is envisioned to generate positive environmental outcomes. Since this is a new and unique mode of intelligent transportation, few is known about its potential success and …
Airport Taxiway Traversal And Safety Optimization Using Combinatorics, Thore Groenlund Rasmussen
Airport Taxiway Traversal And Safety Optimization Using Combinatorics, Thore Groenlund Rasmussen
Theses and Dissertations
The demand for air travel has increased dramatically in the last decade, putting large strain on airports and their limited resources. Expanding the available resources at an airport is not always an option either due to location, budget or time. This forces the administrators of an airport system to use the limited resources as efficiently as possible. This thesis proposes a tool for air traffic controllers and pilots that can be used when planning taxiway systems. Taking inspiration from Dijkstra’s Algorithm, an algorithm is proposed to safely move aircraft from the terminal to the runway. Applying constraints to the algorithm …
Wavelet–Based Functional Data Analysis For Classification And Change Point Detection, Nenad Mijatovic
Wavelet–Based Functional Data Analysis For Classification And Change Point Detection, Nenad Mijatovic
Theses and Dissertations
Data collection and analysis, performed close to the source and transferred to other devices for different analysis, are the major paradigms of the Internet of Things (IoT). Usually, the raw data comes in the form of a time-series sequence that can be considered as functions, and as such can be examined by the functional analysis apparatus. Among others, the two major tasks in data analysis are (1) categorical signal classification and (2) change detection in signal statistical parameters. Here, we study both problems: featureless signal classification using discriminative interpolation regularized with the ℓ1 norm is performed using Classification by Discriminative …
Effect Of Industry Clusters And Commodity Flow Characteristics On The Selection Of Freight Transportation Modes In The United States With Advanced Econometric Approaches, Taleb Eissa Ali Eissa
Effect Of Industry Clusters And Commodity Flow Characteristics On The Selection Of Freight Transportation Modes In The United States With Advanced Econometric Approaches, Taleb Eissa Ali Eissa
Theses and Dissertations
Mode choice is an important strategic decision for shippers to carry commodities efficiently. Freight mode-choice is an important activity to develop a successful freight transportation business in the private sector and to plan for economically consistent freight transportation infrastructures in the public sector. Freight activities result from the complex interactions between different economic agents, but these relationships are commonly relaxed to account for three major agents: shippers, carriers and receivers. Furthermore, the behavior of freight choice is commonly not concentrated in one agent, but rather is divided jointly over multiple individuals and firms in a logistics process, each component of …
Experimental And Numerical Analysis Of The Drag Force On Surfboards With Different Shapes, Omar Lahlou
Experimental And Numerical Analysis Of The Drag Force On Surfboards With Different Shapes, Omar Lahlou
Theses and Dissertations
The aim of the present study is to define the hydrodynamic resistance of surfboards with different designs. Decreasing the drag acting on a board helps the surfer to attain higher surfing performances. It helps to attain higher speeds and maneuvering for the surfer. In this thesis, theoretical, experimental and computational approaches are used to explain how the drag changes with different surfboard shapes. Four surfboards with varying shapes were towed at different speeds and the resulting force was recorded. Two computational models were developed using Star CCM and Flowsquare to confirm the experimental results. The drag force on the boards …
Characterization Of Rf Signal Propagation For Wireless Sensor Network Deployed In Mountainous Environment, Bandar Mohammad Alshawi
Characterization Of Rf Signal Propagation For Wireless Sensor Network Deployed In Mountainous Environment, Bandar Mohammad Alshawi
Theses and Dissertations
Wireless sensor network (WSN) nodes, in mountainous forests, report real-time data to base stations concerning events, in which researchers and decision makers are interested in. A thorough research reveals the deficiency of any study modeling radio frequency (RF) in that environment. The lack of accurately modeling RF signal propagation in any environment can have a great impact on the network life, connectivity, and coverage. This dissertation models the loss of RF signal in the mountainous environment and demonstrates the inconsistency of theoretical models, compared to actual measurements. The models proposed in this research yield satisfactory results, and the theoretical models …
Simulation Environment For Astrobee-Rings System, Tamerlan Yeleussizov
Simulation Environment For Astrobee-Rings System, Tamerlan Yeleussizov
Theses and Dissertations
The thesis analyzes a flight software of a new free flying robot Astrobee, that will change the current Synchronized Position Hold Engage Reorient Experimental Satellites (SPHERES) on International Space Station (ISS). First, the main components of the flight software were examined: Robotic Operating System (ROS), Gazebo and MATLAB. During that phase, functionalities of ROS, Gazebo and MATLAB were analyzed, and it was found how these components integrate between each other to build Astrobee flying software. Next, simulation of two Astrobees performing “in-home” and “torque” maneuvers was executed. After a successful completion of simulation, results of Astrobee’s trajectory was recorded. Then, …
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 …
Numerical Study On Seakeeping Performance Of Hydrofoil Assisted Submersible Trimaran (Hast), Yuchen Lin
Numerical Study On Seakeeping Performance Of Hydrofoil Assisted Submersible Trimaran (Hast), Yuchen Lin
Theses and Dissertations
The present study focuses on the seakeeping characteristics of Hydrofoil Assisted Submersible Trimaran (HAST). The seakeeping performance is an important part in ship design because it effects the comfort, control, resistance and safety. The motions in wave will reduce the performance of ship which is designed and optimized in calm water. The heave and pitch motions of HAST in calm water and regular waves have been investigated by STAR CCM+, a CFD analysis program. The theory of numerical simulation based on STAR CCM+ has been presented. The basic theory of seakeeping performance studies has been discussed. A series of simulations …