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Diagnosis And Prognosis Of Electrical And Mechanical Faults Using Wireless Sensor Networks And A Two-Stage Neural Network Classifier, Akarsha Ramani Jul 2008

Diagnosis And Prognosis Of Electrical And Mechanical Faults Using Wireless Sensor Networks And A Two-Stage Neural Network Classifier, Akarsha Ramani

Electrical Engineering Theses - Archive

Diagnosis and isolation of electrical and mechanical problems in induction motors has always been a very challenging task. Some of the common problems in induction motors are: bearing, stator winding, and rotor bar failures. This thesis has three phases: The first one pertains to development of low-cost test-beds for simulating bearing faults and short circuit stator winding faults in a motor. Bearing fault is due to the failure of any of the components of the bearing and the stator winding fault is due to the failure of insulation between the windings. Bearing faults can be identified from the motor vibration …

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Theoretical And Experimental Study Of Wide-Band Quasi-Planar Conical Antennas, Tsungyin Wu Jul 2008

Theoretical And Experimental Study Of Wide-Band Quasi-Planar Conical Antennas, Tsungyin Wu

Electrical Engineering Theses - Archive

Conical antennas are widely used in many applications because of their broad input impedance bandwidth and omni-directional radiation pattern. However, conical antennas usually have three-dimensional structures and are, hence, relatively difficult to fabricate and integrate. In this thesis, a quasi-planar conical antenna is proposed, where the simulation and measurement results indicate that dielectric loading could mechanically stabilize the antenna while keeping the input impedance invariant within a broad band. Also, the proposed antenna keeps the original wide-band and omni-directional properties. Specifically, a few configurations of the quasi-planar conical antenna are simulated, fabricated, and tested. The simulation and measurement results show …

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Eukasimbiosys: A Stochastic Discrete Event-Based Simulation Software For In-Silico Study Of Insulin Signaling And Metabolism In Cardiac Myocytes, Amin Reza Mazloom Jul 2008

Eukasimbiosys: A Stochastic Discrete Event-Based Simulation Software For In-Silico Study Of Insulin Signaling And Metabolism In Cardiac Myocytes, Amin Reza Mazloom

Computer Science and Engineering Dissertations - Archive

The advent of human genome annotation in the early years of third millennium has enabled the scientist to interlink the processes of life at the molecular level. The coincidence of this breakthrough along with advances in computational technology and high-throughput experimental techniques has promoted the emergence of numerous -omics data resources. Although for years before such discovery, scientist believed that cellular processes are the product of interaction between genes and gene products; However, any effort to exploit a comprehensive picture of cellular processes had been obscured due to the knowledge gap that avoided to correlate the cellular processes at the …

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Architectures And Methods For Energy-Efficient Querying And Indexing In Wireless Sensor Networks, Kyungseo Park Jul 2008

Architectures And Methods For Energy-Efficient Querying And Indexing In Wireless Sensor Networks, Kyungseo Park

Computer Science and Engineering Dissertations - Archive

Wireless sensor networks have been an active research area for about a decade due to their adaptability to applications involving long-term environmental monitoring. Recent technologies make it possible that a small device equipped with multi-purposed sensors, small CPU and memory, wireless transmitter and receiver, and software can form a network, measure some quantitative phenomena and communicate with each other seamlessly. In wireless sensor networks, one of the basic applications is to monitor events and measure values at places that people cannot reach easily or where a long term sensing task is required. In this case, we need to know the …

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Biodegradable Fluorescent Polymers, Santosh Gautam Jul 2008

Biodegradable Fluorescent Polymers, Santosh Gautam

Bioengineering Theses - Archive

Most of the works done on fluorescent polymers are focused on their potential applications in lighting industries. Much less interest has been paid for their potential application in the field of biology and biomedical engineering. Although multiple biological uses of green fluorescent proteins (GFPs) have been addressed by different groups, their potential for biomedical applications is hampered by their tendency to photobleach rapidly and their short fluorescence lifetime. Quantum dots have emerged as a potential substitute for those applications, but their cytotoxicity and lack of biodegradability restrict their use in a biological system. An ideal fluorescent material that could be …

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Decision And Control In Distributed Cooperative Systems, Prasanna Mohan Ballal Jul 2008

Decision And Control In Distributed Cooperative Systems, Prasanna Mohan Ballal

Electrical Engineering Dissertations - Archive

This dissertation presents novel matrix-based approaches for decision and control in distributed cooperative systems such as wireless sensor networks. A novel matrix-based Discrete Event Controller has been implemented for task planning and resource dispatching in a network consisting of stationary ground sensors and mobile agents also known in the literature as mobile wireless sensor networks. The use of shared resources in such systems can sometimes cause a phenomenon called system deadlock, where all the processes in the system come to a standstill. This work presents a new matrix-based algorithm that has been implemented for deadlock avoidance in a system with …

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Hardware Platform For Research In Helicopter Uav Control, Petru Emanuel Stingu Jul 2008

Hardware Platform For Research In Helicopter Uav Control, Petru Emanuel Stingu

Electrical Engineering Theses - Archive

The topic discussed in this work addresses the current research being conducted at the Automation & Robotics Research Institute in the areas of UAV helicopter instrumentation targeted towards aerobatic flight control and heterogenous multi-vehicle cooperation. A modular electronic control system is designed which includes sensors communicating over a CAN bus and an on-board computer that runs a special real-time Linux kernel. The majority the electronics is developed by the author, including the electronic schematics, PCB design, component soldering and the supporting software. Commercially available modules are used for the radio transceivers or the on-board computer. The same control system is …

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Visible Versus Near-Infrared Light Penetration Depth Analysis In An Intralipid Suspension As It Relates To Clinical Hyperspectral Images, Tinsy John Perumanoor Jul 2008

Visible Versus Near-Infrared Light Penetration Depth Analysis In An Intralipid Suspension As It Relates To Clinical Hyperspectral Images, Tinsy John Perumanoor

Bioengineering Theses - Archive

We determine the penetration depth of near-infrared and visible light in a tissue phantom model using various image processing techniques and chemometrics and use these results to demonstrate the application of a multimodal hyperspectral imaging system for monitoring blood perfusion in amputation wounds. It is capable of performing a noninvasive, in vivo, quantitative analysis of human tissue in a clinical environment, in terms of the percent saturation of oxyhemoglobin. The instrument majorly consists of near-infrared and visible charge coupled devices (CCDs), lenses, liquid crystal tunable filters (LCTFs) for both the CCDs attached to their respective lenses, and a broad band …

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Cap: A Context-Aware Privacy Protection System For Location-Based Services, Aniket Pingley Jul 2008

Cap: A Context-Aware Privacy Protection System For Location-Based Services, Aniket Pingley

Computer Science and Engineering Theses - Archive

Location Based Services (LBS) are information services that provide users with customized contents, such as the nearest restaurants/hotels/clinics, retrieved from a dedicated spatial database. They make use of technologies such as Global Positioning System (GPS), triangulation/triliteration etc. to get the geographical position of the user. Since the queries on spatial database include the user's current location, LBS may raise serious concerns on the user's location privacy. If disclosed, a user's location information may be misused in many ways by a malicious adversary who has access to the LBS server or even by the LBS provider. Therefore, our aim in this …

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High-Level Constraint Support For Combinatorial Testing, Anthony C. Opara Jul 2008

High-Level Constraint Support For Combinatorial Testing, Anthony C. Opara

Computer Science and Engineering Theses - Archive

Combinatorial testing constructs test cases by combining different input parameter values based on some effective combinatorial strategy. This software testing approach has displayed very promising attributes and is rapidly gaining popularity in recent years. However, existing work does not provide adequate support for constraint handling. Constraints are often specified as part of an input parameter model and they may be due to several reasons such as incompatibility between certain hardware and software components. A test generation algorithm needs to take these constraints into account during the test generation process to exclude combinations that are invalid from the domain semantics. In …

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Novel Algorithms For Medium/Low-Voltage Arcing Faults In Switchgear & Motor Coils: From Concept To Realization, Mandhir Singh Sahni Jul 2008

Novel Algorithms For Medium/Low-Voltage Arcing Faults In Switchgear & Motor Coils: From Concept To Realization, Mandhir Singh Sahni

Electrical Engineering Dissertations - Archive

Switchgear arcing faults have been a primary cause for concern for the manufacturing industry and safety personnel alike. The deregulation of the power industry being in full swing and ever-growing competitiveness in the distribution sector calls for the transition from preventive to predictive maintenance. Switchgear forms an integral part of the distribution system in any power system set-up. Keeping in mind the switchgear arcing faults, the transition mentioned above applies most of all to the switchgear industry. Apart from the fact that it is the primary cause of serious injuries to electrical workers worldwide, switchgear arcing faults directly affect the …

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Stepping-Stone Network Attack Kit (Sneak) For Evading Timing-Based Detection Methods Under The Cloak Of Constant Rate Multimedia Streams, Jaideep D. Padhye Jul 2008

Stepping-Stone Network Attack Kit (Sneak) For Evading Timing-Based Detection Methods Under The Cloak Of Constant Rate Multimedia Streams, Jaideep D. Padhye

Computer Science and Engineering Theses - Archive

With the advent of the Internet, network-based security threats have been constantly on the rise. The source of an attack could be traced by studying the system logs and the source IP address of the attack can be used to identify and prosecute the attacker. To avoid getting traced and to mislead the forensic investigators, attackers usually compromise weaker nodes on less secure networks and use them as stepping stones to attack the victim. This technique makes it difficult for the investigators to trace the real source of attack. Hence, it is important to research the stepping stone detection techniques …

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Efficient Processing Of Set Queries Using Bitmap Index, Muhammad Assad Safiullah Jul 2008

Efficient Processing Of Set Queries Using Bitmap Index, Muhammad Assad Safiullah

Computer Science and Engineering Theses - Archive

Growing complexity of enterprise-wide data and business processes necessitates the efficiency of complex decision support set queries. However, contemporary DBMS remain unsuccessful in handling set queries efficiently. In this thesis we propose efficient set query processing methods using bitmap index. The methods use bitmap vectors to represent attributes values in binary format. The methods test groups within a schema in a hierarchical fashion. Satisfying groups are bisected further and checked recursively while non-satisfying groups are pruned resulting in significant reduction in response times. In addition, our iterative implementation avoids the inefficiency that can be introduced by recursive implementation by reading …

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Image Mirroring, Rotation And Interpolation In The Wavelet Domain, Theju Isabelle Jacob Jul 2008

Image Mirroring, Rotation And Interpolation In The Wavelet Domain, Theju Isabelle Jacob

Electrical Engineering Theses - Archive

JPEG2000, the international standard for still image compression, uses the wavelet transform. The filters used in JPEG2000 for transformation are the 9/7 Daubechies filters and the 5/3 Le Gall filters. At present, to achieve image mirroring or rotation for images, one has to convert them back to spatial domain and proceed. This thesis presents methods by which it can be implemented in the wavelet domain, without extra computational complexity. To do so, one manipulates the transform domain coefficients so that the condition of perfect reconstruction still holds true. The thesis also discusses a method to achieve image interpolation, which would …

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A Context-Aware Learning, Prediction And Mediation Framework For Resource Management In Smart Pervasive Environments, Nirmalya Roy Jul 2008

A Context-Aware Learning, Prediction And Mediation Framework For Resource Management In Smart Pervasive Environments, Nirmalya Roy

Computer Science and Engineering Dissertations - Archive

Advances in smart devices, mobile wireless communications, sensor networks, pervasive computing, machine learning, middleware and agent technologies, and human computer interfaces have made the dream of smart environments a reality. An important characteristic of such an intelligent, ubiquitous computing and communication paradigm lies in the autonomous and pro-active interaction of smart devices used for determining inhabitants' important contexts such as current and near-future locations, activities or vital signs. `Context Awareness' is perhaps the most salient feature of such an intelligent computing environment. An inhabitant's mobility and activities play a significant role in defining his contexts in and around the home. …

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Mass Spectrometry Based Proteomic Biomarker Selection And Sample Prediction, Jung Hun Oh Jul 2008

Mass Spectrometry Based Proteomic Biomarker Selection And Sample Prediction, Jung Hun Oh

Computer Science and Engineering Dissertations - Archive

High-resolution MALDI-TOF (matrix-assisted laser desorption/ionization time-of-flight) mass spectrometry has recently shown promise as a screening tool for detecting discriminatory peptide/protein patterns. The major computational obstacle in finding such patterns is the large number of mass/charge peaks (features, biomarkers, data points) in a spectrum. To tackle this problem, we have developed methods for data preprocessing and biomarker selection. The preprocessing consists of binning, baseline correction, and normalization. An algorithm, Extended Markov Blanket (EMB), is developed for biomarker detection, which combines redundant feature removal and discriminant feature selection. The biomarker selection couples with support vector machine (SVM) to achieve sample prediction from …

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Comprehensive Data Analysis For Biomarker Pattern Discovery Using Dna/Protein Microarrays, Young Bun Kim Jul 2008

Comprehensive Data Analysis For Biomarker Pattern Discovery Using Dna/Protein Microarrays, Young Bun Kim

Computer Science and Engineering Dissertations - Archive

During the last decade, the advent of microarray technology has stimulated rapid research advances in bioinformatics. Microarray data pose great challenges for computational data analysis, because of their large dimensionality (up to several tens of thousands of genes) and their small sample sizes. In order to deal with these particular characteristics of microarray data, the need and importance for feature selection techniques were realized. While a lot of research deals with classification methods and their application to microarray data, only a few approaches are explicitly designed to consider interaction among the investigated features. It is well known that the interactions …

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Performance Analysis And Effect Of Multi-User Interference For Ultra Wideband Communications, Mukta Athavale Jul 2008

Performance Analysis And Effect Of Multi-User Interference For Ultra Wideband Communications, Mukta Athavale

Electrical Engineering Theses - Archive

Ultra-Wideband (UWB) is an upcoming technology for short-range high data rate applications like Wireless Personal Area Networks or medium/long-range low data rate applications like sensor networks. UWB has many captivating characteristics such as very short duration pulses (order of nanoseconds), multipath channel, large instantaneous bandwidth and time hopping pulse trains resulting in coexistence with the existing narrow band users. The Ultra Wideband communication systems employ the technique of Impulse radio of transmitting short duration pulses which result in extremely wide bandwidth and many performance benefits. Since UWB systems operate in dense multipath environments, RAKE receiver is the optimum choice for …

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Silicon Carbide Nanotubes: Promises Beyond Carbon Nanotubes, Kazi Mohammad Monirul Alam Jul 2008

Silicon Carbide Nanotubes: Promises Beyond Carbon Nanotubes, Kazi Mohammad Monirul Alam

Physics Theses - Archive

First-principles calculations for the electronic and geometric structures of three different types of armchair and zigzag silicon carbide nanotubes from (3, 3) to (11, 11) and (3, 0) to (11, 0) have been performed using hybrid density functional theory and the finite cluster approximation. Full geometry and spin optimizations have been performed without any symmetry constraints. A detailed comparison of the structures and stabilities of the three types of nanotubes is presented. The dependence of the electronic band gaps on the respective tube diameters, energy density of states and dipole moments as well as Mulliken charge distributions have been investigated. …

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Magnetic Drug Targeting: Development Of A Novel Drug Delivery System For Prostate Cancer Therapy, Maham Rahimi Jun 2008

Magnetic Drug Targeting: Development Of A Novel Drug Delivery System For Prostate Cancer Therapy, Maham Rahimi

Bioengineering Dissertations - Archive

Magnetic nanoparticles (MNPs) have been attracting a great amount of attention because of their numerous applications including contrast agents in magnetic resonance imaging (MRI), magnetic targeted drug carriers, and hyperthermia treatments for cancer. However, complications, including aggregation of MNPs, have limited their use in drug delivery applications. To overcome these limitations, several methods have been developed to coat magnetic particles. One method includes coating them with polymers to produce polymer/MNPs for increasing the MNP dispersion and stability. This method also increases the efficiency of loading and releasing drugs to specific locations for the treatment of various diseases including prostate cancer. …

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Tribological And Antiwear Mechanisms Of Fluorinated Zinc Dialkyl Dithiophosphate In Comparison To Zinc Dialkyl Dithiophosphate In Engine Oils, Ramoun Mourhatch May 2008

Tribological And Antiwear Mechanisms Of Fluorinated Zinc Dialkyl Dithiophosphate In Comparison To Zinc Dialkyl Dithiophosphate In Engine Oils, Ramoun Mourhatch

Material Science and Engineering Dissertations - Archive

Tribofilms generated in wear tests using lubricants containing fluorinated ZDDP and ZDDP were studied. Fluorinated ZDDP demonstrated superior wear performance compared to ZDDP under tribological conditions even at lower phosphorus levels. Chemical properties and the molecular structure of the fluorinated ZDDP were examined and presented in a previous companion study by Parekh and Aswath [1] using techniques such as NMR and DSC while this study examines the tribological behavior of this compound and the characteristics of the tribofilms formed by it. Ball on cylinder tribological tests were conducted with lubricants containing this new fluorinated thiophosphate compound and compared to lubricants …

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A Study Of The Antiwear Behavior And Oxidation Stability Of Fluorinated Zinc Dialkyl Dithio Phosphate In The Presence Of Antioxidants, Anuradha Somayaji May 2008

A Study Of The Antiwear Behavior And Oxidation Stability Of Fluorinated Zinc Dialkyl Dithio Phosphate In The Presence Of Antioxidants, Anuradha Somayaji

Material Science and Engineering Dissertations - Archive

The antiwear additive Zinc dialkyl dithio phosphate (ZDDP) is one of the most important components of engine-oil additives and a major source of phosphorus. Phosphorus plays a crucial part in mitigating engine wear, yet has been proven harmful to modern catalytic converters. Progressive regulatory caps on phosphorus content in automotive lubricants have led to widespread efforts to reduce its levels. A new fluorinated ZDDP (F-ZDDP) complex developed at the University of Texas at Arlington has found to breakdown at lower temperatures compared to ZDDP and has showed better wear performance than ZDDP alone. This would allow the possibility of further …

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An Assistive Navigation Paradigm For Semi-Autonomous Wheelchairs Using Force-Feedback And Goal Prediction, John H.C. Staton May 2008

An Assistive Navigation Paradigm For Semi-Autonomous Wheelchairs Using Force-Feedback And Goal Prediction, John H.C. Staton

Computer Science and Engineering Theses - Archive

As computer technology advances and facilitates an increased amount of autonomous sensing and control, the interface between the human and autonomous computer systems becomes increasingly important. This applies in particular in the realm of service robotics where robots with increasing levels of autonomy are constantly interacting with human users and where it is paramount to have an efficient way to convey user intentions and commands to the robot system, integrate them into the robot's action and control, and to indicate robot control choices to the user in a "natural", intuitive way. One particular example where semi-autonomous operation of a vii …

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Trajectory Optimization Using Collocation And Evolutionary Programming For Constrained Nonlinear Dynamical Systems, Brandon Merle Shippey May 2008

Trajectory Optimization Using Collocation And Evolutionary Programming For Constrained Nonlinear Dynamical Systems, Brandon Merle Shippey

Mechanical and Aerospace Engineering Theses - Archive

Trajectory design and optimization has a broad variety of applications in fields such as aerospace and electrical engineering. The solution of a trajectory that minimizes a cost function subject to nonlinear differential equations of motion and various types of constraints may be obtained by the methods of optimal control theory. A framework is presented for numerical solution of the optimal control problem. The solution is converted to that of a constrained discrete parameter optimization problem. Direct collocation and nonlinear programming are used to perform a local gradient-based search for the optimal solution. A genetic algorithm combined with a shooting method …

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Regenerative Peripheral Neurointerfacing Of Upper Extremity Prostheses, Kshitija Garde May 2008

Regenerative Peripheral Neurointerfacing Of Upper Extremity Prostheses, Kshitija Garde

Bioengineering Theses - Archive

Current robotic prosthetic devices provide limited functionality to the user as they rely on gross myogenic control and lack critical sensory feedback needed for fine movement control. Interfacing the nervous system with the robotic prosthesis would facilitate amputees to control them naturally, in resemblance to the human hand. Functional neuro-electrode connections have been demonstrated in the brain and peripheral nervous system; however, gliosis, micro hemorrhages, axonopathy and excessive inflammation limit their long-term use. We evaluated the possibility of enticing peripheral nerve regeneration through a multi-electrode array with an open architecture as an alternative to enhance longevity of nerve-electrode interface. Regenerative …

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Energy-Efficient Connected K-Coverage, Duty-Cycling, And Geographic Forwarding In Wireless Sensor Networks, Habib M. Ammari May 2008

Energy-Efficient Connected K-Coverage, Duty-Cycling, And Geographic Forwarding In Wireless Sensor Networks, Habib M. Ammari

Computer Science and Engineering Dissertations - Archive

With the fast advances in inexpensive sensor technology and wireless communications, the design and development of large-scale wireless sensor networks has become cost-effective and viable enough to attract the attention of a wide range of civilian, natural, and military applications, such as health and environmental monitoring, seism monitoring, and battlefields surveillance. The main challenge in the design of wireless sensor networks is the limited battery power of the sensors and the difficulty of replacing and/or recharging these batteries due to the nature of the monitored field, such as hostile environments, and cost. Thus, it is necessary that the sensors be …

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A Multi-Level Biomedical Ontology-Enabled Broker: Dynamic Service-Based Data Source Integration, Sheng-Chieh Jack Fu May 2008

A Multi-Level Biomedical Ontology-Enabled Broker: Dynamic Service-Based Data Source Integration, Sheng-Chieh Jack Fu

Computer Science and Engineering Dissertations - Archive

Web services have recently become a new trend for gathering biomedical information. However, it is not easy to integrate and obtain a concise/complete query result among thousands of service operations. In this dissertation, we propose a multi-level ontology-enabled service broker system for dynamically integrating web services in the biomedical domain (BioServiceBroker). By introducing multi-level modeling concepts and intra/inter level relationships, our approach facilitates more accurate modeling of biomedical ontologies, which leads to a better understanding of the data stored in various biological data sources as well as the services provided by the data sources. In addition, we incorporate temporal concepts …

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Design For Reliability In Microoptelectromechanical Systems (Moems), Abiodun Abiodun Fasoro May 2008

Design For Reliability In Microoptelectromechanical Systems (Moems), Abiodun Abiodun Fasoro

Mechanical and Aerospace Engineering Dissertations - Archive

Microelectromechanical systems (MEMS) is an enabling technology for miniaturization. MEMS consist of micron sized moving mechanical structures and electronics fabricated on a suitable substrate such as silicon. MEMS has found applications in virtually every aspect of human life, ranging from the automobile to the aerospace, and from the telecommunications to the consumer electronic industries. Technology integration has led to several subsets of MEMS e.g. microoptoelectromechanical systems (MOEMS), radio-frequency MEMS (RF MEMS), etc. Together with these added functionalities, by way of technology integration come additional issues and challenges never before experienced by packaging engineers. MEMS and MOEMS package requirements vary widely …

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Dynamic Modeling, Control And Optimization Of Pem Fuel Cell System For Automotive And Power System Applications, Woon Ki Na May 2008

Dynamic Modeling, Control And Optimization Of Pem Fuel Cell System For Automotive And Power System Applications, Woon Ki Na

Electrical Engineering Dissertations - Archive

This dissertation is focusing on fuel cell dynamic modeling and control, the optimization design of fuel cell systems, power electronics interface designs, and control for the fuel cell based hybrid system. First, a dynamic PEM fuel cell model is proposed as a nonlinear, multiple-input, multiple-output (MIMO) system so that feedback linearization can be directly utilized and the PEM fuel cells can be protected through the controller. For the design of the dynamic model PEM fuel cells, all possible water effects are considered, and the anode and cathode gas pressures, as well as the fuel cell voltage are defined as the …

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Biaxial Mechanical Characterization Of Porcine Periosteum, Phillip Daniel Warren May 2008

Biaxial Mechanical Characterization Of Porcine Periosteum, Phillip Daniel Warren

Bioengineering Theses - Archive

Periosteum is multipotent tissue responsible for cortical bone deposition and is important in fracture repair. Research indicates the periosteum is mediated by similar mechanical signals to those that mediate bone growth and remodeling. Therefore, biaxial mechanical characterization of periosteum can be very informative, indeed. This paper presents the results of the first such examination. The porcine periosteum herein has at least three distinct layers - a cellular layer, an elastin-rich layer, and a collagen-rich layer - the latter two providing structural integrity. Not surprisingly then, the general biaxial mechanical characteristics of periosteum resemble those of other collagen and/or elastin-rich membranes. …

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