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Articles 1591 - 1620 of 3180
Full-Text Articles in Engineering
Distributed Algorithms For Electric Vehicle Charging, Akshay Malhotra
Distributed Algorithms For Electric Vehicle Charging, Akshay Malhotra
Electrical Engineering Theses - Archive
Coordinated charging of plug-in electric vehicles (PEVs) can effectively mitigate the negative effects imposed on the power distribution grid by uncoordinated charging. Simultaneously, coordinated charging algorithms can accommodate the PEV user’s needs in terms of desired state-of-charge and charging time. In this work, the problem of tracking an arbitrary power profile, by coordinated charging of PEVs, is formulated as a discrete scheduling process, while accounting for the heterogeneity in charging rates and restricting the charging to only the maximum rated power. Then, a novel distributed algorithm is proposed to coordinate the PEV charging and eliminate the need for a central …
Reducing Encoder Complexity Of Intra-Mode Decision Using Cu Early Termination Algorithm, Nishit Samirbhai Samirbhai Shah
Reducing Encoder Complexity Of Intra-Mode Decision Using Cu Early Termination Algorithm, Nishit Samirbhai Samirbhai Shah
Electrical Engineering Theses - Archive
In this thesis an intra prediction algorithm is proposed that terminates complete full search prediction for the CU and is replaced by CU early termination algorithm which determines the complexity of the CU block and then decision is made to further split or non-split the CU. When the CU texture is complex the CU is split into smaller sub units to find the best size and when the CU texture is flat, the CU is not divided further into sub – units. Down sampling is done first after which complexity is calculated by which a threshold value is set. This …
H.265 (Hevc) Bitstream To H.264 (Mpeg 4 Avc) Bitstream Transcoder, Deepak Hingole
H.265 (Hevc) Bitstream To H.264 (Mpeg 4 Avc) Bitstream Transcoder, Deepak Hingole
Electrical Engineering Theses - Archive
With every new video coding standard the general rule of thumb has been to maintain same video quality at a reduced bit rate of about 50% as compared to the previous standard. H.265 is the latest video coding standard with support for encoding videos with wide range of resolutions, starting from low resolution to beyond High Definition i.e. 4k or 8k. H.265 also known as HEVC was preceded by H.264 which is very well established and widely used standard in industry and finds its applications in broadcast, storage, multimedia telephony. Currently almost all devices including low power handheld mobile devices …
Sparse Signal Reconstruction In Linear Inverse Scattering Problem, Tanmoy Bhowmik
Sparse Signal Reconstruction In Linear Inverse Scattering Problem, Tanmoy Bhowmik
Electrical Engineering Theses - Archive
Proper mathematical modeling of inverse scattering problem is of utmost importance in applications such as optical imaging and microscopy, radar, acoustic, seismic and medical imaging. However, the problem is non-linear and ill-posed due to the diffusive nature of wave propagation through the scattering medium. Born and Rytov approximation are two widely used techniques to linearize the inverse scattering problem that simplifies the mathematics and modeling of wave propagation through scattering medium in special cases. The linear inverse scattering problem is still severely ill-posed and hence, in general, the solution is not stable and unique, unless a priori knowledge about the …
A High Frequency Memristor Emulator Circuit, Manu Chilukuri
A High Frequency Memristor Emulator Circuit, Manu Chilukuri
Electrical Engineering Theses - Archive
In this thesis, a low power, high frequency memristor emulator has been designed. The purpose of emulator circuit is to mimic the behavior of a memristor. The circuit consists of a summing amplifier, an integrator and a multiplier. The circuit has been implemented using commercial off the shelf (COTS) components in Keysight ADS simulation tool. For CMOS implementation, the emulator circuit has been designed using IBM 0.18um technology. The design of each circuit has been explained in this work. The Opamp designed achieves a gain of 89 dB, output swing of 1.584V and a bandwidth of 3.67 MHz. The circuit …
Multi-Stage Prediction Scheme For Screen Content Based On Hevc, Nagashree Mundgemane Nagaraj
Multi-Stage Prediction Scheme For Screen Content Based On Hevc, Nagashree Mundgemane Nagaraj
Electrical Engineering Theses - Archive
Screen content is a computer generated content which contains text, graphics and animations and the coding of such content is different from coding a photographic content. This thesis emphasizes on coding the screen content keeping the present video coding standard High Efficiency Video Coding (HEVC) as the base. An extension to HEVC to support screen content coding (SCC) is currently under development by the Joint Collaborative Team on Video Coding (JCT- VC) and the main goal of the extension is to provide improved compression performance of text, graphics and animation in addition to photographic content. This thesis focuses on a …
Reducing The Encoding Time Of Motion Estimation In Hevc Using Parallel Programming, Vasavee Vijayaraghavan
Reducing The Encoding Time Of Motion Estimation In Hevc Using Parallel Programming, Vasavee Vijayaraghavan
Electrical Engineering Theses - Archive
High Efficiency Video Coding (HEVC) is the current state-of-art video codec which is widely being adopted by lot of users. It has close to 50% reduction in encoding time compared to its predecessor, H.264 or AVC (Advanced Video Coding) at the cost of increased complexity. Lot of research is going towards reducing the complexity of this codec, at the same time, maintaining the visual quality that it produces and maintaining the reduced encoding time from its predecessor. As an effort to decrease the encoding time further, there can be several approaches. Parallel processing is taking a dominant role in many …
Enhanced Shrinkage Characterization Of Clayey Soils, Raju Acharya
Enhanced Shrinkage Characterization Of Clayey Soils, Raju Acharya
Civil Engineering Dissertations - Archive
Surficial slope failure is a common problem experienced by most of the compacted earth dams in Texas and several other southern states in USA as a result of desiccation or shrinkage induced cracking of the surficial soils. Cracking of the soil occurs when the tensile stress exceeds the tensile strength during drying process. Tensile stress increases with an increase in shrinkage strain and thus soil chemical admixtures can reduce the tensile stress by reducing the shrinkage potential of soil. Inclusion of such admixtures invariably affects the tensile strength. Yet there are not many test methods that could be utilized for …
A Study On Evaporative Cooling For Data Centers & Artificial Neural Network Modeling, Pritam Karmokar
A Study On Evaporative Cooling For Data Centers & Artificial Neural Network Modeling, Pritam Karmokar
Mechanical and Aerospace Engineering Theses - Archive
This study mainly aims at exploring how, one of the best “Green” solutions for IT equipment cooling aka Evaporative Cooling, can be optimized for better future deployment. Also, this study focuses on ways to deploy Artificial Neural Network models to Dynamic Systems. Today, SERVERS are one of most important devices that our technology driven world cannot do without. Efficiently cooling these delicate yet highly power dense beasts, while being environment friendly is one of our prime concerns. This study is a combination of two deceptively divergent works. First, on exploring the workings of this technique by investigating one such Evaporative …
Cae Analysis On A Ford Ecoboost Mustang Connecting Rod For Forged Steel, Aluminum 7075, Shiva Prasad Keralapura Basavaraju
Cae Analysis On A Ford Ecoboost Mustang Connecting Rod For Forged Steel, Aluminum 7075, Shiva Prasad Keralapura Basavaraju
Mechanical and Aerospace Engineering Theses - Archive
Connecting rod is high volume production critical component in an automobile engine. Every Internal combustion engine uses a connecting rod. Connecting rod must have highest possible rigidity with lowest possible weight. The major stress developed in the connecting rod are axial stress, due to combustion chamber pressure, and bending stress, due to centrifugal effect. Connecting rod mainly fails due to fatigue; according to survey, about 90% of the time the failure is due to fatigue. CAE analysis on Ford Eco boost Mustang connecting rod is carried out to validate the life of the connecting rod for forged steel and Aluminium7075. …
Computational Model For Steady State Simulation Of A Plate-Fin Heat Exchanger, Ajit Rajesh Desai
Computational Model For Steady State Simulation Of A Plate-Fin Heat Exchanger, Ajit Rajesh Desai
Mechanical and Aerospace Engineering Theses - Archive
High performance heat transfer devices are critical components in hybrid power generation systems. The design of a Recuperator for 'waste heat recovery' is crucial for reducing the operating cost of a hybrid system. Plate-fin heat exchangers occupy a special position among high performance heat exchangers because of the compactness, efficiency and flexibility they offer. The performance of these heat exchange devices is typically very sensitive to fluid property variations, axial conduction and heat losses to environment. This thesis presents a numerical model of a plate fin heat exchanger in which fluid property variations including temperature driven changes in specific heat …
Experimental Investigation Of Spatial-Mode-Selective Frequency Up-Conversion, Mohan Giribabu
Experimental Investigation Of Spatial-Mode-Selective Frequency Up-Conversion, Mohan Giribabu
Electrical Engineering Theses - Archive
We experimentally investigate the spatial-mode-selective frequency up-conversion by sum-frequency generation in a second-order medium. In particular, we are interested in zero and first order Gaussian modes. In our experiment, we generate pump and signal pulses of 400 ps duration, spatially modulate them, and couple them into a Periodically Poled Lithium Niobate (PPLN) waveguide. Only one signal mode selected by the pump’s spatial profile is up-converted. The up-converted signal is separated from the original signal and pump beams, modes are captured on a camera and efficiency of up-conversion is recorded. We also discuss some important phase-matching conditions for nonlinear interaction in …
Investigation Of Scalable Hevc And Its Bitrate Allocation For Uhd Deployment In The Context Of Http Streaming, Uma Sagar Madhugiri Dayananda
Investigation Of Scalable Hevc And Its Bitrate Allocation For Uhd Deployment In The Context Of Http Streaming, Uma Sagar Madhugiri Dayananda
Electrical Engineering Theses - Archive
High Efficiency Video Coding (HEVC/H.265) [1] is the state of the art video compression standard, which provides bitrate reduction in the range of 50% when compared to the previous Advanced Video Coding (AVC/H.264) [5] standard at similar video quality. Scalable High Efficiency Video Coding (SHVC) [2] is the scalable extension of HEVC, which provides traditional scalability options in terms of quality, spatial resolution and temporal frame rate and newer scalability options as well. SHVC can be used to deliver Ultra High Definition (UHD) or 4K resolution video content to mix of clients having varying characteristics. The distribution of clients is …
Comprehensive Neural Network Forecasting System For Ground Level Ozone In Multiple Regions, Gautam Raghavendra Eapi
Comprehensive Neural Network Forecasting System For Ground Level Ozone In Multiple Regions, Gautam Raghavendra Eapi
Civil Engineering Dissertations - Archive
A comprehensive neural network daily maximum 8 hour-ozone forecasting model was developed based on five years of data (2010-2014) collected from 50 monitoring sites from the Dallas Fort Worth, Houston-Galveston-Brazoria, Los Angeles, San Joaquin and San Diego regions. This work represents the first neural network developed to forecast ozone in multiple regions, as well as multiple sites in the same region. Previous studies have developed separate neural network models to forecast ozone at each location. Two stages of feature selection were applied to reduce input vector dimension and redundancy. These are Piecewise Linear Orthonormal Floating Search (PLOFS), and Karhunen - …
Mechanical Reliability Of Porous Low-K Dielectrics For Advanced Interconnect: Study Of The Instability Mechanisms In Porous Low-K Dielectrics And Their Mediation Through Inert Plasma Induced Re-Polymerization Of The Backbone Structure, Yoonki Sa
Material Science and Engineering Dissertations - Archive
Continuous scaling down of critical dimensions in interconnect structures requires the use of ultralow dielectric constant (k) films as interlayer dielectrics to reduce resistance-capacitance delays. Porous carbon-doped silicon oxide (p-SiCOH) dielectrics have been the leading approach to produce these ultralow-k materials. However, embedding of porosity into dielectric layer necessarily decreases the mechanical reliability and increases its susceptibility to adsorption of potentially deleterious chemical species during device fabrication process. Among those, exposure of porous-SiCOH low-k (PLK) dielectrics to oxidizing plasma environment causes the increase in dielectric constant and their vulnerability to mechanical instability of PLKs due to the loss of methyl …
Continuum-Scale Investigation Of Evaporation From Bare Soil Under Different Boundary And Initial Conditions: An Evaluation Of Nonequilibrium Phase Change, Andrew C. Trautz, Kathleen M. Smits, Abdullah Cihan
Continuum-Scale Investigation Of Evaporation From Bare Soil Under Different Boundary And Initial Conditions: An Evaluation Of Nonequilibrium Phase Change, Andrew C. Trautz, Kathleen M. Smits, Abdullah Cihan
Civil Engineering Faculty Publications - Archive
Evaporation and condensation in bare soils govern water and energy fluxes between the land and atmosphere. Phase change between liquid water and water vapor is commonly evaluated in soil hydrology using an assumption of instantaneous phase change (i.e., chemical equilibrium). Past experimental studies have shown that finite volatilization and condensation times can be observed under certain environmental conditions, thereby questioning the validity of this assumption. A comparison between equilibrium and nonequilibrium phase change modeling approaches showed that the latter is able to provide better estimates of evaporation, justifying the need for more research on this topic. Several formulations based on …
Quantification And Normalization Of Noise Variance With Sparsity Regularization To Enhance Diffuse Optical Tomography, Jixing Yao, Fenghua Tian, Yothin Rakvongthai, Soontorn Oraintara, Hanli Liu
Quantification And Normalization Of Noise Variance With Sparsity Regularization To Enhance Diffuse Optical Tomography, Jixing Yao, Fenghua Tian, Yothin Rakvongthai, Soontorn Oraintara, Hanli Liu
Bioengineering Faculty Publications - Archive
Conventional reconstruction of diffuse optical tomography (DOT) is based on the Tikhonov regularization and the white Gaussian noise assumption. Consequently, the reconstructed DOT images usually have a low spatial resolution. In this work, we have derived a novel quantification method for noise variance based on the linear Rytov approximation of the photon diffusion equation. Specifically, we have implemented this quantification of noise variance to normalize the measurement signals from all source-detector channels along with sparsity regularization to provide high-quality DOT images. Multiple experiments from computer simulations and laboratory phantoms were performed to validate and support the newly developed algorithm. The …
Multiregional Functional Near-Infrared Spectroscopy Reveals Globally Symmetrical And Frequency-Specific Patterns Of Superficial Interference, Yujin Zhang, Fulun Tan, Xu Xu, Lian Duan, Hanli Liu, Fenghua Tian, Chao-Zhe Zhu
Multiregional Functional Near-Infrared Spectroscopy Reveals Globally Symmetrical And Frequency-Specific Patterns Of Superficial Interference, Yujin Zhang, Fulun Tan, Xu Xu, Lian Duan, Hanli Liu, Fenghua Tian, Chao-Zhe Zhu
Bioengineering Faculty Publications - Archive
Linear regression with short source-detector separation channels (S-channels) as references is an efficient way to overcome significant physiological interference from the superficial layer for functional nearinfrared spectroscopy (fNIRS). However, the co-located configuration of Schannels and long source-detector separation channels (L-channels) is difficult to achieve in practice. In this study, we recorded superficial interference with S-channels in multiple scalp regions. We found that superficial interference has overall frequency-specific and globally symmetrical patterns. The performance of linear regression is also dependent on these patterns, indicating the possibility of simplifying the Schannel configurations for multiregional fNIRS imaging.
Evaluating The Economic Impacts Of Pipeline Useage On The Indian Oil And Gas Supply Chain., Atul Vilas Kamble
Evaluating The Economic Impacts Of Pipeline Useage On The Indian Oil And Gas Supply Chain., Atul Vilas Kamble
Industrial, Manufacturing, and Systems Theses - Archive
The objective of this dissertation is to find the minimum supply chain cost for the Indian oil and gas industry. The problem is solved by introducing a mixed – integer programming model which will avail in taking the obligatory decisions predicated on the cost estimates for sundry scenarios. In order to meet the objective, categorical objectives were put down to evaluate their impacts. This research was to evaluate the economic impact of mode of transport. This research primarily focusses on the Pipeline mode of transport and how the selected pipe diameter and the flow through the selected pipe affect the …
Evaluating The Economic Impacts Of Pipeline Usage On Texas Oil & Gas Supply Chain, Jashandeep Singh
Evaluating The Economic Impacts Of Pipeline Usage On Texas Oil & Gas Supply Chain, Jashandeep Singh
Industrial, Manufacturing, and Systems Theses - Archive
The objective of this dissertation is to find the minimum supply chain cost for the Texas oil and gas industry, when pipeline is used as the major mode of transporting oil. The problem is solved, by introducing a mixed – integer linear programming model which will help in taking the necessary decisions based on the cost estimates for various scenarios. In order to meet the objective, specific objectives were put down to evaluate their impacts. First was to evaluate the economic impact of mode of transport and the infrastructure second was to evaluate the economic impact of refinery flow. Finally …
Dynamic Functional Connectivity Revealed By Resting-State Functional Near-Infrared Spectroscopy, Zhen Li, Hanli Liu, Jingping Xu, Wenli Liu, Fenghua Tian, Yong He, Haijing Niu, Xuhong Liao
Dynamic Functional Connectivity Revealed By Resting-State Functional Near-Infrared Spectroscopy, Zhen Li, Hanli Liu, Jingping Xu, Wenli Liu, Fenghua Tian, Yong He, Haijing Niu, Xuhong Liao
Bioengineering Faculty Publications - Archive
No abstract provided.
Exploring The Effects Of Atmospheric Forcings On Evaporation: Experimental Integration Of The Atmospheric Boundary Layer And Shallow Subsurface, Kathleen Smits, Victoria Eagen, Andrew Trautz
Exploring The Effects Of Atmospheric Forcings On Evaporation: Experimental Integration Of The Atmospheric Boundary Layer And Shallow Subsurface, Kathleen Smits, Victoria Eagen, Andrew Trautz
Civil Engineering Faculty Publications - Archive
Evaporation is directly influenced by the interactions between the atmosphere, land surface and soil subsurface. This work aims to experimentally study evaporation under various surface boundary conditions to improve our current understanding and characterization of this multiphase phenomenon as well as to validate numerical heat and mass transfer theories that couple Navier-Stokes flow in the atmosphere and Darcian flow in the porous media. Experimental data were collected using a unique soil tank apparatus interfaced with a small climate controlled wind tunnel. The experimental apparatus was instrumented with a suite of state of the art sensor technologies for the continuous and …
Efficient Method To Cool The Data Center Using Solar Energy, Krishna Ketanbhai Desai
Efficient Method To Cool The Data Center Using Solar Energy, Krishna Ketanbhai Desai
Mechanical and Aerospace Engineering Theses - Archive
Solar energy is the only source which is abundantly available and which can be used to power a cooling system that is based on absorption cycle. Solar cooling system can be used to provide refrigeration for food and medicines and comfort cooling also. Such systems are speci cally applicable to the large applications having large cooling loads for particularly big periods of a year. Peak demand for the cooling of a building and the highest availability of solar radiation are in similar phase, which makes solar cooling of any building a potential energy source and also a green solution. In …
Multiphase Flow Modeling And Analysis Of Filling Process For Pulsed Detonation Engines, Swati Chandran Thirumangalath
Multiphase Flow Modeling And Analysis Of Filling Process For Pulsed Detonation Engines, Swati Chandran Thirumangalath
Mechanical and Aerospace Engineering Theses - Archive
The filling process of a pulsed detonation engine with fuel and oxidizer should be carried out quickly in order to maintain a high frequency of operation. The objectives of this research were to model an efficient inlet system for filling the detonation tube with fuel/air mixture in stoichiometric ratio and to evaluate various filling schemes. Numerical modeling of the filling process was done using PointwiseTM for meshing and FluentTM as the flow solver, solving the Reynolds-averaged Navier-Stokes equations with a k-? turbulence model. Five different filling configurations were studied, including endwall, normal and angled, opposing and staggered sidewall. The fuel …
Evaluate The Impact Of Sustainability And Pipeline Quality On Global Crude Oil Supply Chain, Sunny Paraskumar Jain
Evaluate The Impact Of Sustainability And Pipeline Quality On Global Crude Oil Supply Chain, Sunny Paraskumar Jain
Industrial, Manufacturing, and Systems Engineering Dissertations - Archive
United states is one of the largest crude oil producer in the world but the consumption rate is higher than production hence united states imports oil from varies part of world depend on different criteria. The objective of this dissertation is to evaluate the impact of pipeline quality and facility sustainability on crude oil supply chain cost for Russia and Colombia that gave idea about when and where we have to invest to satisfy United states oil requirement. In order to meet this objective, three specific criteria are investigated as follow:1. Evaluate the supply chain factors that determine pipeline quality …
Enhanced Mechanical Stability Of Interlayer Dielectrics With Self-Organized Molecular Pores, Akanksha Pandey
Enhanced Mechanical Stability Of Interlayer Dielectrics With Self-Organized Molecular Pores, Akanksha Pandey
Material Science and Engineering Theses - Archive
In order to reduce resistance-capacitance delays in interconnect structures, ultralow-k films are used as interlayer dielectric materials. In most cases the preferred method to achieve the lower dielectric constant is the use of porous carbon doped silicon oxide (p-SiCOH) dielectrics. A downside of porosity in a dielectric layer during device fabrication is that it reduces the mechanical reliability of the dielectric and increases the susceptibility to adsorption of damaging materials. To overcome this and produce a material which can sustain the rigorous processes of fabrication, it is necessary to optimize the mechanical, thermal and chemical properties along with the electrical …
Enhanced Photocatalytic Performance Of Titania Nanobelts Decorated With Gold Particles Synthesized Using Stirring-Assisted Hydrothermal Method, Yi Shen
Material Science and Engineering Theses - Archive
In this thesis, anatase TiO2 nanobelts (TNBs) have been successfully obtained via an optimized stirring-assisted hydrothermal synthesis. The impact of stirring speed has been studied. Difference in morphology caused by stirring speed was observed by high resolution Field-Emission SEM (FE-SEM). Methylene Blue degradation test indicated that at certain stirring speed, i.e., 700 rpm, which was the highest, produced the best photoactivity than commercial P25 TiO2.Furthermore, Au decorated TNBs were obtained by a simple reduction reaction with Au-containing precursor. The Au-TNBs were founded to outperform in MB degradation the commercial P25 TiO2 and the pristine TNBs under both UV and visible …
Three-Dimensional Indeterminate Impacts In Legged Robotic Locomotion, Abhishek Chatterjee
Three-Dimensional Indeterminate Impacts In Legged Robotic Locomotion, Abhishek Chatterjee
Mechanical and Aerospace Engineering Theses - Archive
Legged robotic systems undergo a large number of impacts during walking or running tasks. These impacts occur over the surface of contact between the feet and the ground. If a rigid body assumption is held, these impacts can be analyzed by selecting a certain number of points on the impacting bodies. A minimum of three points are required for analyzing a surface contact on a plane. However, using a minimum number of points for analyzing surface impact would require an additional analysis for appropriately selecting these points. On the other hand, if a large number of evenly distributed impact points …
Biomechanical Analysis Of The Cornea To Improve Post Surgical Outcomes Through Finite Element Analysis, Salman Nasir Khan
Biomechanical Analysis Of The Cornea To Improve Post Surgical Outcomes Through Finite Element Analysis, Salman Nasir Khan
Mechanical and Aerospace Engineering Dissertations - Archive
Vision deterioration is a major healthcare concern. It is estimated that one in three persons develops some form of vision reducing eye disease by the age of 65 and these numbers are expected to increase. Deterioration in visual acuity is due to ocular diseases that change the shape or clarity of the cornea. Health/shape of the cornea is extremely important as it determines the refractive power of the eye.This work studies ocular surgeries from a mechanical/structural engineering perspective. It begins by discussing laser in-situ keratomileusis (LASIK) surgery and explains the role of lasers in modifying the corneal shape to improve …
Design Of Cooling And Ventilation Of Telecommunication Shelter At High Altitude, Palak Patel
Design Of Cooling And Ventilation Of Telecommunication Shelter At High Altitude, Palak Patel
Mechanical and Aerospace Engineering Theses - Archive
Telecommunication shelters house information technology (IT), networking, power, and cooling equipment such as racks, power cabinets, batteries, fans, etc. For reliable operation of the IT and networking equipment, shelters need to satisfy or exceed minimum environmental guidelines for all equipment they contain. These guidelines typically contain specified operational temperature, maximum gaseous and particular contaminant levels. In this work, cooling and ventilation needs of a telecommunication shelter at an altitude of 9,678 feet are studied by modeling the system and simulating various operational and weather scenarios using FloVENT 10.1, a computational fluid dynamics (CFD) tool. The shelter contains two compartments: the …