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Articles 1 - 22 of 22
Full-Text Articles in Engineering
Route Recovery Schemes For Link And Node Failure And Link Congestion, Ibrahim Takouna
Route Recovery Schemes For Link And Node Failure And Link Congestion, Ibrahim Takouna
Theses
Link/Node failure occurs frequently causing service disruption in computer networks. Hardware techniques have been developed to protect the network from Link/Node failure. These techniques work in physical layer, therefore their convergence time is very small. On the other hand, many schemes have been proposed to mitigate the failure influence on the network. These schemes work in upper layers such as the network layer. However, hardware solutions faster than other schemes, but they are expensive. Link/Node failure causes all flows which were using the failed link/node are temporarily interrupted till a new path reestablished.
Three recovery algorithms have been proposed that …
Theoretical Framework For Predicting Joint Reaction And Ground Reaction Forces In A Dynamic Pendulum Tree Model Of Human Motion, Peyman Rajai
Theses
Lagrangian dynamics and the method of superfluous coordinates are applied to find ground and joint reaction forces on the human body modeled as a general branched 2-D pendulum tree system with arbitrary segments and arbitrarily distributed point masses. A theoretical framework is established for predicting these constraint forces during human motion and consequently their effects on dynamics, dynamic stability, energy efficiency and the potential of these forces to produce joint injury and/or pain. Applications to human walking are initiated. During idealized phases where there is only single point contact of the stance leg with the ground such as just after …
Vibrotactile Sensory Substitution For Post-Stroke Rehabilitation, Carlos X. Rosado
Vibrotactile Sensory Substitution For Post-Stroke Rehabilitation, Carlos X. Rosado
Theses
The aftermath of a stroke leaves people with side effects such as speech and hearing problems, and loss of sensation in one side of their body. Sensory feedback in the hand is used to assess if the individual is using appropriate grip force to hold and use objects; lack of sensory feedback can lead to dropped or damaged objects, and possible hand injury. Existing force biofeedback devices are overly complex and difficult to use in the home. The goal of this project is to provide increased environmental awareness of hand grip force for individuals with reduced hand sensation. Although hand …
Automatic Registration And Segmentation Of Abdominal Images And Detection Of Pancreatic Cancer, Girish Kumar Maniprasad
Automatic Registration And Segmentation Of Abdominal Images And Detection Of Pancreatic Cancer, Girish Kumar Maniprasad
Theses
Localized and detailed analyses of 3D abdominal images obtained through different imaging modalities help greatly in determining the progression of a disease or for postoperative treatment / evaluation. However, such analyses become difficult and sometimes unfeasible due to the effects of patient motion and breathing. This is particularly evident during analysis of the pancreas for cancer, due to its proximity to other intra-abdominal organs. Within subject registration thus becomes imperative for pathological analysis of pancreatic cancer. An intensity-based, global image registration algorithm was developed in the present work, for registration of pancreatic abdominal images. The registration algorithm was automatic and …
In Vitro Feasibility Testing Of Floating Light-Activated Minroelectrical Stimulators, Ammar Riad Abdo
In Vitro Feasibility Testing Of Floating Light-Activated Minroelectrical Stimulators, Ammar Riad Abdo
Theses
One of the major challenges of neural stimulation is the mechanical stress and resulting trauma induced on the implanted electrodes by the constant movement of the interconnects. A potential way of eliminating interconnects is to use floating micro-stimulators that can be activated through optical means. As a method of energy transfer to the micro-stimulator, we propose to use a laser beam at near infrared (NIR) wavelengths.
There are two main objectives in this project to test the feasibility of the main approach; investigate the charge injection capacity of titanium nitride (TiN) and iridium oxide (IrOx) as potential contact materials, and …
Adaptable Videogame Platform For Interactive Upper Extremity Rehabilitation, Sally M. Jensen
Adaptable Videogame Platform For Interactive Upper Extremity Rehabilitation, Sally M. Jensen
Theses
The primary objective of this work is to design a recreational rehabilitation videogame platform for customizing motivating games that interactively encourage purposeful upper extremity gross motor movements. Virtual reality (VR) technology is a popular application for rehabilitation therapies but there is a constant need for more accessible and affordable systems. We have developed a recreational VR game platform can be used as an independent therapy supplement without laboratory equipment and is inexpensive, motivating, and adaptable. The behaviors and interactive features can be easily modified and customized based on players' limitations or progress.
A real-time method of capturing hand movements using …
Development And Evaluation Of A Simultaneous Multithreading Processor Simulator, Carla Verena S. Nunez
Development And Evaluation Of A Simultaneous Multithreading Processor Simulator, Carla Verena S. Nunez
Theses
Modem processors are designed to achieve greater amounts of instruction level parallelism (ILP) and thread level parallelism (TLP). Simultaneous multithreading (SMT) is an architecture that exploits both LLP and TLP. It improves the utilization of the processor resources by allowing multiple independent threads to reside in the pipeline and dynamically scheduling the available resources among the threads.
The first part of this thesis presents the development of a simultaneous multithreading processor simulator. The SMT simulator is derived from SimpleScalar, a superscalar processor simulator widely used in the computer architecture research field. The basic pipeline is expanded to allow multiple threads …
Titanium Nitride As An Electrode Material For High Charge Density Applications, Mustafa Khan Patan
Titanium Nitride As An Electrode Material For High Charge Density Applications, Mustafa Khan Patan
Theses
Present day neural prostheses require electrodes with high current densities. Traditional electrodes are not capable of delivering such high current densities. Titanium nitride as an electrode material and other techniques like reactive ion etching, platinization of titanium were studied in this thesis towards improving charge density of electrodes.
Titanium nitride (TiN) was sputtered in a custom designed pattern of electrodes with silicon as substrate, at a deposition rate of 2 A /sec. Atomic Force Microscopy (AFM) analysis of TiN film showed a smooth surface for a film thickness of 1 μm. X-Ray Diffraction (XRD) analysis of the film showed the …
Non-Repudiation Secure File Transfer Protocol (Nrsftp), Jerry Chen
Non-Repudiation Secure File Transfer Protocol (Nrsftp), Jerry Chen
Theses
Non Repudiation Secure File Transfer Protocol (NRSFTP) is designed to resolve three main concerns for today's electronic file transfer methodology. The three main concerns are Non-Repudiation, Secure, and Non-Real Time file transfer. Non-repudiation is to assure the receiver that the sender of the document is not an imposter. Secure document transfer is to assure the sender that only the intended receiver will be able to read the document. Non-real-time file transfer is to provide convenient and low cost transportability of the encrypted data from one party to another. With the above three concerns addressed, the NRSFTP protocol can be widely …
Numerical Analysis Of The Operation Of A Water Cannon, Teymuraz G. Bitadze
Numerical Analysis Of The Operation Of A Water Cannon, Teymuraz G. Bitadze
Theses
This study was designed to investigate the operational process of a launcher for generation of high speed water projectiles, and it involved the optimization of the geometry of a launcher body. The objective of the optimization of the internal geometry was to increase the effective momentum of the projectile while the optimization of the external geometry resulted in the reduction of the mass of the launcher.
In the course of the optimization of the internal geometry the exit velocity variation was determined, and used to compute an effective projectile momentum, which actually affects a workpiece. In this research, it was …
Functionalization Of Nanoclays Through Exchange Reactions, Jin Uk Ha
Functionalization Of Nanoclays Through Exchange Reactions, Jin Uk Ha
Theses
A cationic clay (sodium-montmorillonite, MMT) and an anionic clay (hydrotalcite, HT) were treated with two phosphonium based ionic liquids (ILs) and a commercial corrosion inhibitor. Clay modification was examined by TGA, FTLR and WXRD. The cationic clay modified with both ILs had similar thermal stabilities since they contained the same cation although the original anions were different. The thermal stability of the modified clays was higher than that of a commercial organoclay and of clays modified in our group with smaller MW pyridinium and imidazolium based cations. 10 wt% of interchanged cation was found under selected time/temperature treatment conditions.
Clays …
Inverse Solid-Liquid Fluidization Of Aerogel Granules And Its Application In Removing Oil From Water, Gaurav Babubhai Patel
Inverse Solid-Liquid Fluidization Of Aerogel Granules And Its Application In Removing Oil From Water, Gaurav Babubhai Patel
Theses
Fluidization is a very well known unit operation used in the chemical industry for various purposes. Inverse solid-liquid fluidization, where the solid particles to be fluidized are less dense than the fluid, is one of the several different kinds of fluidization being studied for its potential in industrial applications. The present work focuses on finding the hydrodynamic characteristics (minimum fluidization velocity, bed expansion and pressure drop) of an inverse fluidized bed of aerogel granules and using this system to remove oil from an oil-water mixture. The solid particles employed for this study are low density (100 kg/m3) surface …
Inverse Dynamic Modeling For Characterization Of Spasticity, Katharine Markel Swift
Inverse Dynamic Modeling For Characterization Of Spasticity, Katharine Markel Swift
Theses
Spasticity affects subjects with cerebral palsy, stroke, multiple sclerosis, and traumatic brain injury. The need to develop a deeper understanding of spasticity is driven by the existing limited understanding and the lack of satisfactory interventions for this disabling phenomenon.
An inverse model is implemented to describe the motion in the pendulum knee drop test. Inverse kinematic modeling is implemented to investigate the pathophysiology of spasticity.
Using the equilibrium point hypothesis as a conceptual framework to explain disabled and non-disabled neuromuscular control, it has been demonstrated that the equilibrium point of the passive knee is dynamic and exhibits a pseudo-exponential trajectory …
Channel-Predictive Link Layer Arq Protocols In Wireless Networks, Huseyin Dogukan Cavdar
Channel-Predictive Link Layer Arq Protocols In Wireless Networks, Huseyin Dogukan Cavdar
Theses
Communication performance over a wireless channel should be considered according to two main parameters: energy and throughput. The reliable data transfer is a key to these goals. The reliable node-to-node data transfer is performed by link layer protocols. One prominent approach is Automatic Repeat Request (ARQ) protocol. The traditional ARQ protocols attempt to recover the erroneously transmitted frames by retransmitting those frames, regardless of the channel state. Since this channel state unaware behaviour may cause unnecessary retransmissions, traditional ARQ protocols are expected to be energy inefficient. Some ideas have been proposed such as stochastic learning automaton based ARQ, and channel …
A Dynamic Supine Stander For Subjects With Disabilities Leading To Prolonged Immobility, Luis Alberto Espina
A Dynamic Supine Stander For Subjects With Disabilities Leading To Prolonged Immobility, Luis Alberto Espina
Theses
Bone tissue needs to be exposed to loading in order to stimulate the osteogenic response of the body. Disabilities that lead to prolonged immobility will result in a decrease of the osteogenic processes and an increase in resorption of bone by osteoclast cells. This disuse modeling can lead to osteopenia, osteoporosis, and subsequent non-traumatic fractures. These disabilities are varied in nature and duration, and can include load bearing bone fracture, excessive obesity, spinal cord injury, and cerebral palsy.
The following describes the concept and design of a novel dynamic supine stander that will provide loads simulating ambulation to the lower …
Multi-Degree Of Freedom Telemanipulation In An Unstructured Environment, Diego Ramirez
Multi-Degree Of Freedom Telemanipulation In An Unstructured Environment, Diego Ramirez
Theses
Two approaches to 6-degrees-of-freedom telemanipulation that will accommodate different needs and skills of potential users with congenital amputation, arthrogryposis, muscular dystrophy and cerebral palsy were developed. One method uses scalable movements (i.e. position and orientation), and the second employs isometric forces and torques without movement. The scalable position approach employs a 6-degress-of-freedom electromechanical stylus whose joint orientations are used by the controlling computer to determine the position and orientation of the robot's end effector via inverse kinematics or by one-to-one matching of the stylus joint angles with those of the manipulator. The isometric method uses the measured forces and torques …
Solubility In Supercritical Carbon Dioxide, Syed Asif Abdullah
Solubility In Supercritical Carbon Dioxide, Syed Asif Abdullah
Theses
The different techniques used for the determination of the solubility of compounds in supercritical carbon dioxide are described. A comparative study is made of the methods used in the measurement of the concentration of benzoic acid and caffeine in supercritical carbon dioxide. The difference in measurement techniques did not have much effect on the solubility data at lower pressures. However, at higher pressures, the solubility data obtained by different techniques began to deviate from each other.
Further, the method used by different researchers in generating the solubility data in supercritical carbon dioxide is also discussed. A number of data sheets …
Determining Continual Improvement Process Methods Within Quality Management Systems, Diane M. Bové
Determining Continual Improvement Process Methods Within Quality Management Systems, Diane M. Bové
Theses
Institutionalized standards require organizations to actively define and implement quality management systems, which includes active participation in continual improvement efforts. Interpretations and practices vary on implementation methodology.
Traditional views of quality do not integrate the technical disciplines into a defined science which would support a standardized approach for continual improvement implementation.
In order to optimize improvement efforts, a conceptual hypothesis is proposed to integrate quality through combining and collaborating implementation efforts of engineering, control, assurance, improvement and costs. The purpose of this thesis is to establish a roadmap to assist in choosing effective quality improvement methodologies and toolsets that assist …
A Kinematic Analysis Of Sign Language, Chemuttaai C. Koech
A Kinematic Analysis Of Sign Language, Chemuttaai C. Koech
Theses
Signed languages develop among deaf populations and employ manual communication instead of voiced communication. Stokoe attributes classify individual signs in American Sign Language (ASL) and include handshape, hand location, movement, orientation, and facial expression. Signed and oral languages are not mutually understood, and many deaf individuals live in linguistic isolation. This research addresses computer translation between signing and speech, investigating sign duration in sentence context versus in isolation and identifying kinematic sign markers. To date, there has been little study of continuous signing kinematics; it was previously unknown if kinematic markers existed.
Kinematic data were collected from a proficient signer …
Burmester Curve And Numerical Motion Generation Of Grashof Mechanisms With Perimeter And Transmission Angle Optimization In Mathcad, Peter J. Martin
Burmester Curve And Numerical Motion Generation Of Grashof Mechanisms With Perimeter And Transmission Angle Optimization In Mathcad, Peter J. Martin
Theses
An infinite number of planar four-bar mechanism solutions exist for a series of prescribed rigid-body positions. Given a set of Burmester curves or numerically-generated fixed and moving pivot curves, sorting through the limitless number of possible mechanism solutions to find one that ensures full link rotatibility, satisfies compactness criteria and produces feasible transmission angles can be a daunting task. In this work, two algorithms are developed and presented by which the user can select optimum planar four-bar motion generators (optimum with respect to Grashof criteria, mechanism perimeter criteria and transmission angle criteria) from a set of all mechanism solutions produced …
Jet Assisted Fluidization Of Nanoparticle Agglomerates, Ayokunle O. Omosebi
Jet Assisted Fluidization Of Nanoparticle Agglomerates, Ayokunle O. Omosebi
Theses
Fluidization serves as a primary operation used to disperse, handle and process nanoparticles, but due to the complications involved with achieving homogenous fluidization of the agglomerates of nanoparticles, several methods have been developed to assist their conventional mode of fluidization.
In this work, the conventional mode of fluidization was coupled with secondary gas flow emerging from a micro jet nozzle. The effect of the jet on the fluidization behavior of various APF and ABF nanopowders was studied and compared with the pure conventional fluidization mode. Generally, experiments were conducted to find the optimal operation of the jet by varying parameters …
Implementation Of Stereo Correspondence Algorithms For Multi-Baseline Vision System, Navaneetha Shivram
Implementation Of Stereo Correspondence Algorithms For Multi-Baseline Vision System, Navaneetha Shivram
Theses
The purpose of this study is to determine the impact of varying camera baselines on correspondence and depth estimation. As the baseline increases the resolution of depth increases but finding correspondences is very tedious. On the other hand when cameras are placed close to each other and thereby reducing the baseline distance points in the images are easily matched however depth resolution deteriorates. This problem is solved by using a multi-camera system is used in which the cameras are spaced close to each other along a straight line. Calculating the correspondence along successive camera pairs is relatively easy. These respondences …