Open Access. Powered by Scholars. Published by Universities.®
- Discipline
- Keyword
-
- Capacitance (1)
- Controllers (1)
- Decoupling Capacitor (1)
- Electromagnetic Band gap (1)
- Electromagnetic Compatibility (1)
-
- Electromagnetic Interference (1)
- Ground Plane (1)
- High Frequency Structural Simulator (1)
- High Impedance Surfaces (1)
- Inductance (1)
- Leap Motion (1)
- Meander Lines (1)
- Metamaterials (1)
- Mil (1)
- Millimeter (1)
- Mobile VR (1)
- Planar Electromagnetic Band gap (1)
- Power Distribution Network (1)
- Printed Circuit Board (1)
- S-parameter (1)
- Simultaneous Switching Noise (1)
- Switch Mode Power Supplies (1)
- Usability (1)
- Virtual reality (1)
Articles 1 - 30 of 66
Full-Text Articles in Engineering
A Heuristic Method For The Determination Of Assembly Network And Line Design For Discrete Manufacturing Processes, Ismael Hernan Naranjo Velez
A Heuristic Method For The Determination Of Assembly Network And Line Design For Discrete Manufacturing Processes, Ismael Hernan Naranjo Velez
Theses and Dissertations
This paper presents with a proposed alternative precedence algorithm which is determined by the Solid surfaces of the product design. The representation address in this paper address the manufacturing planning from all manufacturing levels of the product. Sequence is introduce to this paper in order to proof the propose precedence network alternatives. Both manufacturing level solutions are heuristic. This thesis explores the connection of the precedence and the sequence, as it introduces physical manufacturing constraints and its relationships to the station process planning. Precedence network are usually determine by the designer principal point and assembled connections. The proposed algorithm avoids …
Model Based Systems Engineering High Level Design Of A Sustainable Electric Vehicle Charging And Swapping Station Using Discrete Event Simulation, Obinna Henry Ginigeme
Model Based Systems Engineering High Level Design Of A Sustainable Electric Vehicle Charging And Swapping Station Using Discrete Event Simulation, Obinna Henry Ginigeme
Theses and Dissertations
In line with the spate of technological advances, the transportation industry has also witnessed an increase in the adoption of Electric Vehicles (E.Vs). However, there has been and are still some underlying negating factors to the wide spread acceptance of these electric vehicles; one of note is the unavailability and inaccessibility of adequate charging infrastructure, long charging times, limited driving ranges, costs of the vehicles etc. These and many more characteristics lead to a trend popularly known as “range anxiety”. One of the major strengths of electric vehicles are their ability to be powered by electric energy via stored chemical …
Managed Containers For Increased Cyber-Resilience, Xavier J. Merino Aguilera
Managed Containers For Increased Cyber-Resilience, Xavier J. Merino Aguilera
Theses and Dissertations
Traditional defense mechanisms are no longer adequate in protecting critical infrastructure and mission critical systems. These systems require to be always-on-always-connected. High availability and data integrity become crucial to deliver their mission. Unable to guarantee uncompromisable security and given that systems will inevitably be attacked, we must change our goals to guarantee mission survivability, the ability of the system to fight through the attack. Previous work has been done to increase availability and integrity using virtual machines. We move away from virtual machines towards Linux containers and implement resiliency strategies to guarantee stateful system recovery after an attack. The goal …
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. …
Investigating The Influence Of Functional And Nonfunctional Requirements On Change And Change Propagation, Nathaniel Conde Voris
Investigating The Influence Of Functional And Nonfunctional Requirements On Change And Change Propagation, Nathaniel Conde Voris
Theses and Dissertations
The research presented in this thesis investigates the nature of change and change propagation in requirement documents as they are influenced by requirement type, that is, “Functional” or “NonFunctional,” and how an understanding of these types may refine utilization of the Automated Requirement Change Propagation Prediction (ARCPP) tool when used by design teams. Functionality is determined by asking the question “Does the requirement prescribe something for the project to accomplish?” This question separates the requirements into their requisite types. Using the ARCPP, the relationship and propagation scores were determined for each requirement. Furthermore, the number of relationships were determined for …
System Study Of An On-Orbit Additive Manufacturing Cubesat, Juliette Isabelle Bido
System Study Of An On-Orbit Additive Manufacturing Cubesat, Juliette Isabelle Bido
Theses and Dissertations
The AddCube mission aims to demonstrate additive manufacturing technology in microgravity on a CubeSat platform by 3D-printing a 1-meter long rectangular beam on orbit. To accomplish this task, Made In Space Inc. (MIS) will provide the Extended Structure Additive Manufacturing Machine – CubeSat (ESAMM-C) payload. The high power required by the ESAMM-C payload creates a complex thermal problem within the spacecraft due to tight volume constraints associated with CubeSats. To cope with this problem, an in depth worst-case thermal analysis of the integrated spacecraft is conducted and an appropriate thermal management system for the mission is designed. Temperature regulation is …
The Psychological Health Of Airline Pilots: A Flight Deck Crew’S Perceptions And Willingness To Fly, Jason Charles Herkimer
The Psychological Health Of Airline Pilots: A Flight Deck Crew’S Perceptions And Willingness To Fly, Jason Charles Herkimer
Theses and Dissertations
Pilots have an image of bravado and charisma which includes that of a hardened, unemotional professional. What happens when the inevitable hardship occurs to a pilot? In the past, physical attributes were highly sought after in the recruitment of pilots. Eventually, pilots can and will suffer from the same psychological stressors as the general population. The purpose of this study is to determine the effect stigmatizing attitudes and psychological treatment of pilots have on a flight deck crew’s willingness to fly. The current study incorporated several different methodologies including a between subjects true experimental, an analysis of covariance (ANCOVA), an …
Flight Testing Angle-Of-Attack Warning Combinations On Part 23 Aircraft, Jennifer Grey Geehan
Flight Testing Angle-Of-Attack Warning Combinations On Part 23 Aircraft, Jennifer Grey Geehan
Theses and Dissertations
The high number of accidents involving General Aviation (GA) aircraft leads to a need for improved methods to warn pilots of high angles of attack (AOA) and impending stall. Such methods must be certified by the Federal Aviation Administration (FAA) under Federal Aviation Regulations Part 23 regarding their effectiveness in preventing departures from controlled flight. Therefore, methods of compliance must be developed to certify Part 23 aircraft equipped with AOA warning or limiting systems. The research objectives were to (a) determine methods for the evaluation of AOA warning and limiting systems and to (b) evaluate the effectiveness of baseline combinations …
Sensitivity Of Facial Organs Of Pythons As Deduced By Radiation Heat Transfer Analysis Under Varying Environmental Conditions, Rama Wairagkar
Sensitivity Of Facial Organs Of Pythons As Deduced By Radiation Heat Transfer Analysis Under Varying Environmental Conditions, Rama Wairagkar
Theses and Dissertations
Predicting the behavior of snakes has been an interest to several scientists for the last few decades. Even though considerable amount of research has been carried out pertaining to snakes, there remains a degree of curiosity regarding their striking ability, live prey detection at locations where visual clues are unobtainable, thermosensation and the phenomena that drives these conducts. Researches carried out so far have moderately disregarded the perception of sensitivity of facial pits of snakes and its characteristics under contrasting temperature domains. This thesis attempts to undertake a computational analysis of the sensitivity of facial pits of Burmese pythons under …
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 …
Towards Green Building: Energy Efficient Roof System For Buildings, Dhruv Sangal
Towards Green Building: Energy Efficient Roof System For Buildings, Dhruv Sangal
Theses and Dissertations
The present work focusses on investigating the thermal performance of different energy efficient roof systems for buildings for different climates. Buildings constitutes about 40 percent of total energy consumed by United States, and previous research shows that 20 percent of the building cooling load comes through ceiling of a building. Thus, it is important to analyze different energy efficient roof systems which can help in reducing building cooling and heating load. The present study focusses on three technologies – green roof, radiant barriers and photovoltaics. To analyze the performance of these systems, a detailed energy based mathematical model were developed …
Temporal Transformation Of Barrier Islands A Round Nakdong Estuary, Sukzun Youn
Temporal Transformation Of Barrier Islands A Round Nakdong Estuary, Sukzun Youn
Theses and Dissertations
The Nakdong Estuary system near Busan, South Korea consists of dynamic shorelines characterized by morphological transformations that result from both natural disasters (typhoons and flooding) and construction projects (Nakdong Estuary Dam, gates in the West Nakdong River and Busan New-ports). This study aims to synthesize existing data for tides, waves, bathymetry and meteorological data obtained from a variety of institutions with the objectives of (1) identifying and ranking major factors that influence morphological transformations and (2) determining how these factors influence morphological change over time. These objectives were met by analyzing patterns of flow and sediment transport using Center Point …
Holistic Methodology For Stochastic Space Mission Utility Analysis, Ja'mar Alexander Watson
Holistic Methodology For Stochastic Space Mission Utility Analysis, Ja'mar Alexander Watson
Theses and Dissertations
Analysis and design mechanisms have a profound effect on space missions; yet, space mission engineering is a discipline without unanimous definition and implementation. Current philosophies are inadequate due to incomplete mission phasespaces, disaggregated design methods, exclusion of constitutive relations, curtailed tradespace exploration, and unsubstantiated mission concept solutions. This dissertation presents a new paradigm for simultaneously developing, exploring, and assessing statistically validated space mission concepts. Stochastic modeling and simulation, providing multivariate mission utility analysis with concurrently integrated tradespace exploration, risk assessment, and holistic design, facilitates the methodology. Backtesting of the Apollo II-17 crewed missions to the Moon and retrodiction of Martian …
Effect Of Bioglass Incorporation Into Electrochemically Aligned Collagen Threads On Mechanical Properties And Cell-Mediated Mineralization, Madhura Nijsure
Effect Of Bioglass Incorporation Into Electrochemically Aligned Collagen Threads On Mechanical Properties And Cell-Mediated Mineralization, Madhura Nijsure
Theses and Dissertations
Bone related diseases and disorders are a significant socioeconomic burden in the United States. Autografts and allografts are most commonly used for the treatment of bone defects and non-unions; however, they are associated with limitations such as donor site morbidity and immune rejection, respectively. Over the past few decades, bone tissue engineering (BTE) using scaffold and cells has garnered significant interest as an alternative method for the repair and regeneration of bone defects. Recreation of the tissue microenvironment via the development of biomimetic scaffolds that resemble the physicochemical aspects (i.e., composition, topography, stiffness) of native bone is a promising approach …
Impact Of Electrospun Conduit Composition And Peritoneal Pre-Conditioning On Patency And Remodeling Of Tissue Engineered Vascular Grafts, Mozhgan Shojaee
Impact Of Electrospun Conduit Composition And Peritoneal Pre-Conditioning On Patency And Remodeling Of Tissue Engineered Vascular Grafts, Mozhgan Shojaee
Theses and Dissertations
Overall goal of this project was to develop a tissue engineered vascular graft by implanting an electrospun tubular conduit into the peritoneal cavity to recruit autologous cells to it and provide the cells with the components of the hysiological environment prior to grafting the conduit into the artery. This was accomplished through three complimentary studies: finding the best ratio of poly(ε-caprolactone) (PCL) and collagen that improves inflammatory response within the peritoneal cavity; determining the effect of peritoneal pre-implantation and the amount of incorporated collagen on graft functionality; and reducing the potential side effect of peritoneal adhesion formation. In the first …
A Prediction Model Of Airline Passenger Preference: Identifying Factors That Predict Passenger Preference Between Low Cost And Legacy Carriers., Rian Mahiar Mehta
A Prediction Model Of Airline Passenger Preference: Identifying Factors That Predict Passenger Preference Between Low Cost And Legacy Carriers., Rian Mahiar Mehta
Theses and Dissertations
The purpose of the study was to identify factors that influence a commercial airline passenger’s preference between low-cost and legacy airline carriers. In turn a prediction model of passenger preference was created for American travelers. The study utilized a correlational design with linear multiple regression analyses as the statistical analyses to build the prediction model. The study was conducted in two stages utilizing two independent samples totaling 936 participants (379 females), all from the United States. Data from the first sample was used to create the regression equation for passenger preference. Data from the second sample was used to test …
Vulnerability Model Of Residential Structures Subject To Hurricane Induced Wind, Surge And Inundation, Mohammad Baradaranshoraka
Vulnerability Model Of Residential Structures Subject To Hurricane Induced Wind, Surge And Inundation, Mohammad Baradaranshoraka
Theses and Dissertations
Annualized hurricane-related losses to the built environment in the United States are in the billions of dollars. According to the National Oceanic and Atmospheric Administration, in 2010 39% of the United States population, or 123.3 million inhabitants, lived in a coastal county. This population is expected to increase by 8% from 2010 to 2020. The majority of these people live in buildings prone to hurricanes. The hurricanes can result in wind damage (due to high wind and/or wind-driven rain infiltration) and water damage (due to storm surge and waves or freshwater flooding) to the building and its contents, which are …
Geometry Driven Probabilistic Models For Shape Matching, Classification And Retrieval, Mark Matthew Moyou
Geometry Driven Probabilistic Models For Shape Matching, Classification And Retrieval, Mark Matthew Moyou
Theses and Dissertations
Emulating human vision in a computational framework—known as computer vision—is one of the next major research areas being pursued; this emulation of vision can be viewed from a Systems Engineering perspective. The goal would be to design and develop an Intelligent Vision System built on a framework that could be tailored for specific vision applications. One of the fundamental components of vision is shape, so to design effective vision systems one needs to incorporate shape based algorithms as a core component. This dissertation progresses three facets of shape analysis algorithms: classification, retrieval and registration. Through the use of probabilistic models …
Concept Of Operations And High Level Requirements Framework For The Development Of A Computational Tool For Bridge Deterioration Analysis, Gabrielle Sue Leesman
Concept Of Operations And High Level Requirements Framework For The Development Of A Computational Tool For Bridge Deterioration Analysis, Gabrielle Sue Leesman
Theses and Dissertations
In developing the lifecycles of a system, maintenance and support must be considered. Associated with this portion of the life cycle are periods between needs of maintenance and the cost of each type of maintenance. Previously a few state deterioration models have been created separately to better predict these maintenance cycles for varying ages, materials, traffic flow, and environmental conditions in the deck, substructure, and superstructure of bridges. A particular analysis tool from previous studies involves the development of Markov Chain (MC) models. This paper presents a systematic process to develop MC bridge deterioration models for state/federal transportation agencies. A …
Consumers’ Willingness To Fly In Augmented Cognition Equipped Aircraft, Eric Schanafelt
Consumers’ Willingness To Fly In Augmented Cognition Equipped Aircraft, Eric Schanafelt
Theses and Dissertations
Current advancements in the field of Augmented Cognition have garnered attention from the aviation industry. Equipping flight management systems with Augmented Cognition is a possibility in the near future as the result of recent computing breakthroughs. The purpose of this study was to determine to what extent gender, country of origin and condition of Augmented Cognition affect consumers willingness to fly. To further understand the consumer's decision-making process the participant’s willingness to fly measured through affect (emotion), represented through the six universal facial expressions, (anger, disgust, fear, happiness, sad, and surprise) (Ekman & Friesen, 1971). This study surveyed participants from …
Effect Of Tannic Acid Crosslinking On The Mechanical Properties Of Collagen Scaffolds And Melanoma Cell Proliferation, Christopher J. Bridgeman
Effect Of Tannic Acid Crosslinking On The Mechanical Properties Of Collagen Scaffolds And Melanoma Cell Proliferation, Christopher J. Bridgeman
Theses and Dissertations
Metastatic melanoma is responsible for nearly 10,000 deaths in the United States each year. While the prognosis for patients with localized early stage melanoma cancer is good, the chances of survival for patients with late stage metastatic melanoma are only 16%. Matrix stiffness has been shown to have a profound effect on tumor metastasis for breast cancer, but little is known about its role on melanoma metastasis and progression. Similarly, the therapeutic effect of tannic acid (TA) has been extensively characterized for soft breast and leukemia cancers, but not for melanoma. The goal of the current study was to investigate …
Mathematical Model And Experimental Verification Of Spatially Multiplexed System Using Ray Theory And Modified Laguerre Gaussian Beams, Saud Alanzi
Theses and Dissertations
Spatial/Space Division Multiplexing (SDM) is based on a channel spacing technique in optical fibers that has the potential to inspire a revolution in optical communications. This patented technique provides a method to launch, transport, and detect two or more optical channels that operate at exactly the same wavelength inside a single multimode optical fiber. In addition, the patented technique added a new dimension and a new degree of photon freedom to the existing fiber multiplexing techniques and complements Time Division Multiplexing (TDM) and Wavelength Division Multiplexing (WDM). As a result, the bandwidth of existing and new optical fiber systems maybe …
Tuning Micro-Electro-Mechanical Resonators For Maximum Dynamic Range, Joseph William Fisher
Tuning Micro-Electro-Mechanical Resonators For Maximum Dynamic Range, Joseph William Fisher
Theses and Dissertations
This research seeks to improve the linear dynamic range (LDR) of micro-electromechanical systems (MEMS) resonators, which are commonly used in sensing and timing applications. We address specifically the need for devices whose response is relatively large yet remains single-valued near resonance. We develop and analyze a model for a class of electrostatically actuated micro structures that includes higher order electrostatic effects, thereby allowing one to determine the LDR for devices that are tuned to eliminate cubic order nonlinear effects. The inclusion of the capacitive forces produces a model that is best solved by expanding the force in a Taylor series. …
Improving Crash Safety Of Jet Dragsters Through Modeling And Analysis, Paige Leigh Sanchez
Improving Crash Safety Of Jet Dragsters Through Modeling And Analysis, Paige Leigh Sanchez
Theses and Dissertations
The objective of this thesis was to analyze how additional foam implementation in a jet dragster driver’s compartment can improve driver safety in the case of an accident. This analysis was divided into two sections: a crash simulation analysis and a base excitation mass-spring-damper model analyzing foam behavior. The jet dragster crash simulation modeled, reflected a Larsen Motorsports jet dragster accident in 2011, where a dragster hit the wall at 270 mph between a 43 to 60 degree angle. A static structural simulation, using the dragster chassis, was modeled in ANSYS and several dynamic simulations at varying impact angles were …
Design Of A Compact Helical Counterflow Heat Exchanger, Aravindakshan Thirumalai Ananthanpillai
Design Of A Compact Helical Counterflow Heat Exchanger, Aravindakshan Thirumalai Ananthanpillai
Theses and Dissertations
Compact heat exchangers are desirable in many aerospace applications. New additive manufacturing approaches, such 3D printing, have enabled the fabrication of heat exchange devices utilizing geometries that cannot be fabricated using traditional approaches. The new geometries enabled by 3D printing may result in higher heat transfer using smaller devices, however, constraints associated with the fabrication of these devices also impose potential performance degradations. This document presents the design and analysis of a novel, compact counter flow heat exchanger which uses helically shaped passages to enhance the effectiveness of the heat transfer. Although the helical passages increase the heat transfer and …
Application-Driven Traffic Sensor System Acceptance Tests For Intelligent Transportation Systems, Thiago Goncalves Pereira Mendonca
Application-Driven Traffic Sensor System Acceptance Tests For Intelligent Transportation Systems, Thiago Goncalves Pereira Mendonca
Theses and Dissertations
Transportation agencies strive to keep people and goods moving. Operation and maintenance of transportation infrastructure is key to accomplish their objectives. Intelligent Transportation Systems (ITS) applications rely on massive detection grids that collectively demand significant maintenance resources. Resource constraints force transportation agencies to look for innovative ways to optimize their operational and maintenance costs while serving their users at intended performance levels. This paper presents a Systems Engineering (SE) view to derive traffic detection sensor requirements for components and subsystems based on application-specific needs. The goal of the approach is to obtain stakeholders view of an acceptable performance based on …
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
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 …