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Articles 96901 - 96930 of 197998

Full-Text Articles in Engineering

Optimization Of Heterogeneous Wireless Networks With Massive Mimo, Shitong Yuan May 2016

Optimization Of Heterogeneous Wireless Networks With Massive Mimo, Shitong Yuan

Electrical Engineering Dissertations - Archive

In the next generation wireless communication system, multi-layers of Heterogeneous Networks (HetNets) are required to provide high efficiency bandwidth usage and high speed data throughput. Users’ distribution and their quality of service (QoS) request are random, and the number of users may vary through the time. In order to deal with this problem, this thesis builds two games’ models to optimize the resource allocation corresponding to different situations in the first chapter. The spectrum efficiency is analyzed and compared between two games. By playing those games, cells can serve more users inside one cell, and all users are fair to …

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Hdr Video Compression Using H.265 (Hevc) Main 10 Profile, Srikanth Vasireddy May 2016

Hdr Video Compression Using H.265 (Hevc) Main 10 Profile, Srikanth Vasireddy

Electrical Engineering Theses - Archive

Increasing the resolution of the video has been the main interest in the television industry for a long time. More recently the industry is studying techniques to increase the range of luminance and color representation in videos. This is achieved through High Dynamic Range/ Wide Color Gamut (HDR/WCG) videos by providing visual quality of experience to the end consumers close to that of real life compared to the Standard Dynamic Range (SDR) videos.In order to deliver high-quality video services to consumers, efficient compression techniques are required to store or transmit a video especially for high resolution video formats whilst maintaining …

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Improved Similarity Measures For American Sign Language Recognition Using Manual Handshapes And Hand Appearances, Siddhartha Goutham Swaminathan May 2016

Improved Similarity Measures For American Sign Language Recognition Using Manual Handshapes And Hand Appearances, Siddhartha Goutham Swaminathan

Electrical Engineering Theses - Archive

American sign language is a primary language for approximately 0.5 to 2 million people who are deaf or hard of hearing in the United States[22][23]. When a user encounters an English word which he does not understand, he looks up the meaning for it in a dictionary. However, when an American Sign Language (ASL) user encounters an unknown sign, looking up the meaning of that sign is not an easy task. There are many systems available to access ASL signs that require articulatory properties such as handshapes but these systems fail if there is a slight variation of what the …

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Multilayer Perceptron With Adaptive Activation Functions, Chinmay Appa Rane May 2016

Multilayer Perceptron With Adaptive Activation Functions, Chinmay Appa Rane

Electrical Engineering Theses - Archive

A Multilayer perceptron typically has a fixed nonlinear activation function for each hidden unit. In this thesis, an adaptive activation function for individual hidden unit is designed, where the network learns these activation functions at every iteration using a modern second order algorithm. Methods and algorithms for these adaptive activation functions along with several other techniques for training a multilayer perceptron’s weights are discussed. Comparisons between a multilayer perceptron with sigmoidal activation functions and a multilayer perceptron with piecewise linear activation functions are also discussed. The common activation function used is the sigmoidal activations, but it is still not proven …

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Multi-Stage Enhancement Scheme For Low Quality Fingerprint Images, Ramakrishna Vighna Venkata Lanka May 2016

Multi-Stage Enhancement Scheme For Low Quality Fingerprint Images, Ramakrishna Vighna Venkata Lanka

Electrical Engineering Theses - Archive

Security and authentication go hand in hand in today’s internet age. The population growth and increase in web-based services have posed a substantial risk of identity theft and fraud. The need for reliable authentication to protect one’s belongings has become essential. The goal of such an authentication system is to recognize a person by validating his/her identity. The traditional identity management systems which validate on the basis of knowledge and tokens such as passwords and identity cards are susceptible to theft and duplication. Hence these systems cannot suffice for reliable identity management. Biometrics on the other hand validate an individual …

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Reversible Data Hiding Using Histogram Shifting, Sai Saketh Nandagiri May 2016

Reversible Data Hiding Using Histogram Shifting, Sai Saketh Nandagiri

Electrical Engineering Theses - Archive

With the current state-of-the-art technology, intruders can easily gain access to sensitive information. To avoid this, different methods with improved security to hide information have been developed like, covert channels, hiding data in images, null ciphers, etc. The focus of this work is to enhance the security and data hiding capacity of the current state-of-the-art reversible data hiding algorithms. The proposed data hiding method is designed such that the original image is losslessly restored after extraction of a payload. The proposed framework allows embedding of a binary bit stream into the host or cover image while retaining the quality of …

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Future Of Jpeg Xt: Privacy And Security, Maitri Shah May 2016

Future Of Jpeg Xt: Privacy And Security, Maitri Shah

Electrical Engineering Theses - Archive

JPEG is de facto the most important and popular image format since 1992 which provides compressed images to a great extent. JPEG XT, the latest standardization of the JPEG committee, provides some amazing features like: backwards compatibility, support for High Dynamic Range (HDR), lossless and near-lossless coding, and alpha channel coding, which were not provided by the previous JPEG standards. With the increase in the demand for photos- capturing, sharing, editing- privacy concerns have become the primary issue. Leakage of private photos to unauthorized users is unacceptable and hence the need for protecting and developing an algorithm to maintain the …

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Compression Artifact Reduction In Hevc Using Adaptive Bilateral Filter, Rohith Reddy Etikala May 2016

Compression Artifact Reduction In Hevc Using Adaptive Bilateral Filter, Rohith Reddy Etikala

Electrical Engineering Theses - Archive

The High Efficiency Video Coding (HEVC) [8] is the latest video standard developed by Joint Collaborative Team on Video Coding (JCT-VC), a group of video coding experts from ITU-T Video Coding Experts Group and ISO/IEC Moving Picture Experts Group (MPEG). As the demand for HD video (4K and 8K) increased, there is a need for higher coding efficiency than H.264/AVC. Also, there is increased use of parallel processors. So, HEVC [8] has been introduced to support increased video resolution and parallel processing. HEVC obtains about 50% reduction in bit rate when compared to its predecessor H.264/AVC at the same visual …

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A Switched Capacitor Based Transimpedance Amplifier For Detection Of Hab Through Optical Sensing, Uthra Mahendran May 2016

A Switched Capacitor Based Transimpedance Amplifier For Detection Of Hab Through Optical Sensing, Uthra Mahendran

Electrical Engineering Theses - Archive

In the recent years, there has been a substantial increase in the manifestation of harmful algal blooms. A certain species called cyanobacteria that is commonly present in freshwater bodies are found to release a class of deadly toxins known as microcystin. This toxin poses a threat to humans and wildlife since they can cause severe illness or even death on consumption of contaminated water. Traditional sampling methods are essentially lab based detection methods that are inconvenient and demands extensive manual effort. Hence, large-scale occurrence of harmful blooms in water resources demands the development of efficient and reliable methods for monitoring …

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Comparison Of Different Metals As Electrodes For A Flexible Micro Ph Sensor, Pavan Kumar Kota May 2016

Comparison Of Different Metals As Electrodes For A Flexible Micro Ph Sensor, Pavan Kumar Kota

Electrical Engineering Theses - Archive

pH can be explained in general terms as a numerical scale used to state the acidity or basicity of an aqueous solution. Keeping track of pH is very useful in many applications like medicine, civil engineering, chemical engineering, biology, water purification etc. Most commonly used pH sensors employ glass electrodes but there are some disadvantages associated with these kinds of pH sensors. Glass is a rigid, chemically reactive and fragile material. Also, glass electrodes, owing to the size require significant quantity of solution to test for pH which makes it difficult to use in cases where we have very little …

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Analysis Of Shock-Plugs In Quasi-One-Dimensional Compressible Flow, Matthew Alexander Thompson May 2016

Analysis Of Shock-Plugs In Quasi-One-Dimensional Compressible Flow, Matthew Alexander Thompson

Graduate Theses - Mechanical Engineering

At small length scales, such as in micro-nozzles, the assumption that a shock wave is infinitesimally thin breaks-down due to the thickness of the shock being non-negligible compared to the dimensions of the nozzle. In this thesis, shock waves of finite thickness, or “shock-plugs,” are modeled using the same methods and assumptions as a standard shock wave analysis. Due to the finite thickness of shock-plugs, however, two additional parameters are required in order to account for the differing inlet and exit areas, as well as the pressure on the side walls of the channel. A “typical” micro-nozzle with appropriate dimensions …

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Framework Of Performance-Based Contracting For Chip Seal And Striping Maintenance Activities, Kishor Shrestha May 2016

Framework Of Performance-Based Contracting For Chip Seal And Striping Maintenance Activities, Kishor Shrestha

UNLV Theses, Dissertations, Professional Papers, and Capstones

In the United States, there are more than four million miles of road network and new roads are being constructed every year. Most of the road networks were constructed more than two decades ago. Therefore, the age of the majority of the pavement inventory has exceeded original design life. This results in increased work load for the maintenance division of the state Departments of Transportation (DOTs). To maintain the road system, state DOTs use In-House or outsource maintenance works to private contractors using Method Based Contracting (MBC), or Performance Based Contracting (PBC), or any combination of these three. Literature reviews …

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Design Of A Wide Area Controller Using Eigenstructure Assignment In Power Systems, Parimal Saraf May 2016

Design Of A Wide Area Controller Using Eigenstructure Assignment In Power Systems, Parimal Saraf

All Dissertations

Small signal stability has become a major concern for power system operators around the world. This has resulted from constantly evolving changes in the power system ranging from increased number of interconnections to ever increasing demand of power. In highly stressed operating conditions, even a small disturbance such as a load change can make the system unstable resulting in small signal instability. The main reason for small signal instability in power systems is an inter-area mode/s becoming unstable. Inter-area modes involve a group of generators oscillating against each other. Traditionally, power system stabilizers installed on the synchrous machines were used …

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Developing A Logistics Risk Assessment Tool, Daniel C. Fritsche May 2016

Developing A Logistics Risk Assessment Tool, Daniel C. Fritsche

Industrial Engineering Undergraduate Honors Theses

Economies around the world have thrived in the wake of the development and keen understanding of effective supply chain management practices. As a result, organizations have become more dependent on other organizations to move their products and services to completion due to complex sourcing and shipping arrangements that have precipitated from the formation of sophisticated supply chains. A supply chain is in general a flow of products or services. When this flow is disrupted or halted, disastrous consequences can ensue. In the worst cases, such as with a disaster relief organization like the American Red Cross, disruptions in supply chains …

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Engineered Resilient Systems Model Applied To Network Design, Zephan W. Wade May 2016

Engineered Resilient Systems Model Applied To Network Design, Zephan W. Wade

Industrial Engineering Undergraduate Honors Theses

Engineered Resilient Systems (ERS) is a Department of Defense (DoD) program focusing on the effective and efficient design and development of resilient complex engineered systems throughout their lifecycle. There is growing literature with qualitative definitions of resilience and quantitative models for systems, but these focus typically on systems with one performance measure. In application, many systems have multiple functions and multiple performance measures. This research uses a quantitative resilience framework for ERS that includes system design options, reliability, external threats, vulnerabilities, responses, and consequences assessed on multiple system performance measures. This paper applies the ERS framework to designing resilient networks.

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A Dj Robot, Robert Hure, Josh King May 2016

A Dj Robot, Robert Hure, Josh King

Mechatronics Final Projects

This report discusses the design of an audio entertainment device incorporating movement, lights, and motion in order to entertain the user, shown in Fig. 1. The user inserts a source of music through an AUX cord, which controls the color of the lights display based on the frequency of music. Through a control box tethered to the device, shown in Fig. 2, the user controls the amplitude of rotary motion the lights move before returning back to its original position and repeating, which is controlled by a stepper motor. The user also has control of which color represents the bass, …

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Sustainability Assessment Of Recycled Asphalt Mixtures In Texas, Reza Saeedzadeh May 2016

Sustainability Assessment Of Recycled Asphalt Mixtures In Texas, Reza Saeedzadeh

Civil Engineering Dissertations - Archive

The pavement practitioners use more recycled materials in asphalt mixtures in order to compensate for the high price of petroleum products and save the limited resources of virgin materials. Reclaimed Asphalt Pavement (RAP) and Recycled Asphalt Shingles (RAS) have been in wide use in asphalt mixtures for several decades. Public perception on the utilization of recycled materials is that the mixtures become more cost effective and more environmental friendly. This is true when the initial stage of construction of pavements is assessed. However, a mixture that costs less and/or burdens the environment less at the beginning may require more frequent …

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Wallarm, Amanda Dinh, Kate Walls May 2016

Wallarm, Amanda Dinh, Kate Walls

Mechatronics Final Projects

The nature of our project is essentially an upgraded alarm clock that ensures that the user will wake up at the time set. Figure 1 displays the hardware of the project and has colored circles to indicate different components. The alarm functions by initially sounding a loud buzzer (red) at the set alarm time. If the user decides to snooze the alarm by pressing the snooze button (purple), the alarm will wait for a given amount of time before setting off the buzzer again. It will then trigger a Servo motor (pink) that will flip a traditional toggle switch to …

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Smart Fan, Sang Choi, Shawn Sunday May 2016

Smart Fan, Sang Choi, Shawn Sunday

Mechatronics Final Projects

The conventional desk fans rely on manual user inputs such as buttons or some sort of mechanical inputs that require user’s physical contact. The Smart Fan, however, is a fan that is purely operated by sound as user input to adjust speed and directionality of the fan. The device listens for user to provide sound input such as clapping, snapping or tapping through microphones attached on the front and the sides of the device.

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Mechalele (Self-Playing Ukulele), Timothy F. Davison, Arsenio Gonzalez, Taylor Piske May 2016

Mechalele (Self-Playing Ukulele), Timothy F. Davison, Arsenio Gonzalez, Taylor Piske

Mechatronics Final Projects

This project involves the design and implementation of a self-playing ukulele. The ukulele plays chords and plucks open strings based on a song or chord progression selected by the user. Each string on the ukulele has a designated hobby servo motor that plucks the string with pre-programmed timing as is shown in Figure 1 (3). The plucking is achieved by attaching a flexible piece of cardboard to the shaft of the servo to act as the guitar pick. By moving the motors together at once, the action of strumming can be approximated. The design uses the last three frets on …

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Simulation Of Conservation Practice Effects On Water Quality Under Current And Future Climate Scenarios, Carlington W. Wallace May 2016

Simulation Of Conservation Practice Effects On Water Quality Under Current And Future Climate Scenarios, Carlington W. Wallace

Open Access Dissertations

Analysis of the effects of implementing different conservation practices, as well as increased levels of conservation practices under existing and projected future climate, will determine if current conservation practice recommendations will be sufficient to maintain soil and water resources. The Soil and Water Assessment Tool (SWAT) was used to study four watersheds of different sizes (CCW = 680 km2, F34 = 183 km2, AXL = 42 km 2 and ALG = 20 km2) located in Northeastern Indiana. The overarching goal of this study was to evaluate the effect of various agricultural practices on runoff and agricultural chemical losses under current …

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Development And Analysis Of A Statics And Kinematics Demonstration As A Learning Tool In The Biomechanics Classroom, Bethany D. Knight May 2016

Development And Analysis Of A Statics And Kinematics Demonstration As A Learning Tool In The Biomechanics Classroom, Bethany D. Knight

Biomedical Engineering Undergraduate Honors Theses

This study was done with the objective of determining if students in the biomedical engineering department at the University of Arkansas would gain better understanding of basic biomechanics principles through the implementation of in-class demonstrations. Biomechanics was chosen because it is the first class taken in sequence after the “Introduction to Biomedical Engineering” class. A pre-demonstration survey was administered to gauge how comfortable the students were with the topics on the syllabus. Two demonstrations were done in class and related homework was assigned. The post-semester survey was administered and collected to determine how effective the students felt the presentations to …

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A 'Tissue Model' To Study The Barrier Effects Of Living Tissues On The Reactive Species Generated By Surface Air Discharge, Tongtong He, Dingxin Liu, Han Xu, Zhichao Liu, Dehui Xu, Dong Li, Qiosong Li, Mingzhe Rong, Michael G. Kong May 2016

A 'Tissue Model' To Study The Barrier Effects Of Living Tissues On The Reactive Species Generated By Surface Air Discharge, Tongtong He, Dingxin Liu, Han Xu, Zhichao Liu, Dehui Xu, Dong Li, Qiosong Li, Mingzhe Rong, Michael G. Kong

Bioelectrics Publications

Gelatin gels are used as surrogates of human tissues to study their barrier effects on incoming reactive oxygen and nitrogen species (RONS) generated by surface air discharge. The penetration depth of nitrite into gelatin gel is measured in real time during plasma treatment, and the permeabilities of nitrite, nitrate, O3 and H2O2 through gelatin gel films are quantified by measuring their concentrations in the water underneath such films after plasma treatment. It is found that the penetration speed of nitrite increases linearly with the mass fraction of water in the gelatin gels, and the permeabilities of …

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Bbq Grill Temperature Uniformity Study, Monty Dodge Jr, Samuel Melo May 2016

Bbq Grill Temperature Uniformity Study, Monty Dodge Jr, Samuel Melo

Mechanical Engineering

Bull Outdoor Products, Incorporated, a barbeque grill and outdoor kitchen manufacturer, sponsored this project with the intent of improving the temperature uniformity across the surface of their barbecue grills. For this project, the Cal Poly team of mechanical engineering students, Monty Dodge Jr. and Samuel Melo, used the Brahma grill head model with setups for both natural gas and propane. In order to determine exactly what the uniformity across the grill surface was, the student team designed a testing apparatus which would measure a grid of temperature locations one inch apart spanning an area 16 by 36 inches. Developing a …

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Material Evaluation Of A Lightweight, Automated Canned Pet Food Dispenser, Kathryn Marie Carr May 2016

Material Evaluation Of A Lightweight, Automated Canned Pet Food Dispenser, Kathryn Marie Carr

Honors Capstones

No abstract provided.

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Pentaerythritol Triacrylate-Co-Trimethylolpropane Nanocomposite Scaffolds As Osteogenic Components For Bone Tissue Engineering, Mollie Marie Smoak May 2016

Pentaerythritol Triacrylate-Co-Trimethylolpropane Nanocomposite Scaffolds As Osteogenic Components For Bone Tissue Engineering, Mollie Marie Smoak

Honors Capstones

No abstract provided.

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Developing Modeling, Optimization, And Advanced Process Control Frameworks For Improving The Performance Of Transient Energy-Intensive Applications, Seyed Mostafa Safdarnejad May 2016

Developing Modeling, Optimization, And Advanced Process Control Frameworks For Improving The Performance Of Transient Energy-Intensive Applications, Seyed Mostafa Safdarnejad

Theses and Dissertations

The increasing trend of world-wide energy consumption emphasizes the importance of ongoing optimization of new and existing technologies. In this dissertation, two energy–intensive systems are simulated and optimized. Advanced estimation, optimization, and control techniques such as a moving horizon estimator and a model predictive controller are developed to enhance the profitability, product quality, and reliability of the systems. An enabling development is presented for the solution of complex dynamic optimization problems. The strategy involves an initialization approach to large–scale system models that both enhance the computational performance as well as the ability of the solver to converge to an optimal …

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Markov-Based Ranking Methods, Baback Vaziri May 2016

Markov-Based Ranking Methods, Baback Vaziri

Open Access Dissertations

Ranking methods are an essential tool to help make decisions. This dissertation document examines different aspects of the theory and application of pairwise comparison ranking methods, specifically those that use Markov chains. First, a new method is developed to solve a traditional recruiting problem, and is shown to improve the predictive power of its ranking. Next, modifications are made to an existing method that theoretically improves the reliability, while maintaining the rank integrity. Last, a framework is developed that defines a fair and comprehensive ranking method, and several popular methods are evaluated in their ability to adhere to the said …

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A Cross-Sectional And Mixed-Method Assessment Of Safety Culture And Safety Climate At A Regional Airline, Micah S. Walala May 2016

A Cross-Sectional And Mixed-Method Assessment Of Safety Culture And Safety Climate At A Regional Airline, Micah S. Walala

Open Access Dissertations

The researcher applied a mixed methods approach to conduct a cross-sectional assessment of the safety culture, safety climate, and SMS at a regional airline in the United States. Data collection techniques were comprised of interview, on-line-survey, and a focus group activity. Participants in the current study were maintenance technicians, flight attendants, dispatchers, pilots, and managers. Results indicated significant differences of perception of safety climate, safety culture, and Safety Management System between the maintenance technicians and flight attendants. The length of time a participant had worked at the subject airline and age of the participant appeared to be significant factors of …

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Investigation Of Climate Variability And Climate Change Impacts On Corn Yield In The Eastern Corn Belt, Usa, Ruoyu Wang May 2016

Investigation Of Climate Variability And Climate Change Impacts On Corn Yield In The Eastern Corn Belt, Usa, Ruoyu Wang

Open Access Dissertations

The increasing demand for both food and biofuels requires more corn production at global scale. However, current corn yield is not able to meet bio-ethanol demand without jeopardizing food security or intensifying and expanding corn cultivation. An alternative solution is to utilize cellulose and hemi-cellulose from perennial grasses to fulfill the increasing demand for biofuel energy. A watershed level scenario analysis is often applied to figure out a sustainable way to strike the balance between food and fuel demands, and maintain environment integrity. However, a solid modeling application requires a clear understanding of crop responses under various climate stresses. This …

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