Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 33 for “"Switching performance"”.
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Characterizing Task-Switching Performance in Adults with ADHD
… areas of executive functioning, including task-switching. Individuals with ADHD are typically slower and less accurate when switching between tasks during a cued paradigm. However, Sams et al. (2017) examined task-switching ability in adult ADHD with a more naturalistic voluntary paradigm that …
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Unlocking SiC MOSFET Switching Performance Through Packaging and Instrumentation
… this reduces losses and supports higher switching frequencies. In contrast, packaging and measurement technologies have not significantly evolved to support these emerging high-speed devices. Traditional wire-bonding packaging technologies that were originally developed in the 1950's are …
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Design and Optimization of Multichip GaN Module Enabling Improved Switching Performance
… semiconductors (SiC & GaN) due to their enhanced performance and superior material properties compared to traditional silicon power devices have become the ultimate choice for future high-performance power electronics energy conversion. GaN high electron mobility transistor (HEMT) offers very fast …
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Task switching and short-term retention: The role of memory load in task switching performance
Shifting, which is the process of switching task sets between two or more tasks, incurs a cost: participants are slower and more error prone when a switch is required, relative to when the same task is performed in a sequential manner. Recent research in our lab has found a performance dissociation …
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An experimental investigation of the effects of inlet geometry on the performance of a bistable fluid amplifier
The effects of varying inlet geometry on the performance of bistable fluid amplifiers were investigated experimentally on a large scale model flip-flop operated with air. Performance curves and power jet velocity profiles were taken for straight, right angle, and layer change entries to the power …
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Task Switching in Predictable and Unpredictable Cases
… the cognitive processes that underlie the switching between simple cognitive tasks. Central to these experiments was the predictability factor; in half of the cases, the upcoming task could be predicted in advance with absolute certainty while in the other half no foreknowledge regarding …
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Experimental Evaluation of Medium-Voltage Cascode Gallium Nitride (GaN) Devices for Bidirectional DC–DC Converters
… the boundaries of power devices to handle higher switching frequencies, output power levels, blocking voltages, and operating temperatures. However, tradeoffs in switching performance and converter efficiency when substituting GaN devices for Si and SiC counterparts are not well defined, …
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LLC Resonant Converter Based Single-stage Inverter with Multi-resonant Branches
… converter can achieve high efficiency and soft-switching performance. Since the dc gain curve of the single-resonant LLC converter is flat when the switching frequency is larger than the resonant frequency, namely fs>fr, an additional L-C series resonant branch is paralleled to the original …
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The Folded Hypercube ATM Switches
Over the past few years, many high performance asynchronous transfer mode (ATM) switches have been proposed. The majority of these switches have high performance but also high hardware complexity. Therefore, there is a need for switch designs with low complexity and high performance. This research …
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Optimization of Power MOSFET for High-Frequency Synchronous Buck Converter
… MOSFETs plays an important role in the system performance. Circuit and device modeling is important in understanding the relationship between the device parameters and the power loss. The gate-to-drain charge (Qgd) is studied by a novel nonlinear model and compared with the simulation results. …
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Application of High-Power Snubberless Semiconductor Switches in High-Frequency PWM Converters
… but lacked the ability to perform high frequency switching. Low-power converters, such as computer power supplies and low horsepower motor drives, have employed high-frequency switching for years and have benefited from very nice output waveforms, good control dynamic performance, and many other …
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Code-switching, Structural change and Convergence: A study of Sesotho in contact with English in Lesotho
This study investigates whether code-switching practices among Sesotho-English bilinguals promote convergence between Sesotho and English. First, the study identifies different types and patterns of code-switching between Sesotho and English and analyses them using Myers-Scotton’s (1993) Matrix …
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Performance Analysis of Multicomputer Interconnection Network Designs
In this thesis, the design and performance issues of multicomputer interconnection networks are addressed. Analytic models are used to evaluate the performance of large scale multicomputer networks. Performance is measured as the average end-to-end delay between communicating nodes. The models …
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Atomic Layer Deposition of Vanadium Dioxide: Synthesis, Doping, and Device Applications
… MIT makes VO₂ useful for devices with improved switching performance and as the building block for alternative computing architectures such as oscillators and memristors. The pressing issue of integrating VO₂ into the existent semiconductor device fabrication process is the synthesis of VO₂ thin …
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Switching Trajectory Control for High Voltage Silicon Carbide Power Devices with Novel Active Gate Drivers
… ideal switch with high dv/dt and di/dt. The fast switching speed of SiC devices introduces challenges for the application since electromagnetic interference (EMI) noise and overshoot voltage can be serious. Also, the insulation should be carefully designed to prevent partial discharge.</p> <p>To …
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A Low Temperature Co-fired Ceramic (LTCC) Interposer Based Three-Dimensional Stacked Wire Bondless Power Module
… bonded module. The 3-D stack exhibits better switching performance compared to the wire bonded counterpart. The measurement results for the 3-D stack shows 30% decrease in current overshoot at turn-on and 43% voltage overshoot at turn-off compared to the wire bonded module. Through …
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Highly scaled silicon field emitter arrays with integrated silicon nanowire current limiters
… between the gate and the substate that limits switching performance. In this thesis, we address these challenges with a new device architecture that consists of a sharp silicon emitter atop a silicon nanowire embedded in a dielectric matrix of SiO₂ and SiNx. The 10-[mu]m tall, 200-nm diameter …
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Characterization and Failure Mode Analysis of Cascode GaN HEMT
… HEMT to switch with faster transition and lower switching loss. By applying the GaN HEMT in a circuit design, it is possible to achieve high frequency, high efficiency, and high density power conversion at the same time. To characterize the switching performance of the GaN HEMT, an accurate …
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The Clustered Insulated Gate Bipolar Transistor (CIGBT) — from concept to manufacturing
… in excellent current saturation and efficient switching performance. Principals of the device operation and the internal mechanisms at different operation conditions have been analysed using numerical modeUing. It is shown that a superior trade off between the on state voltage and the turn off …
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DESIGN OF DYNAMIC CAPACITIVE WIRELESS POWER TRANSFER SYSTEMS FOR ELECTRIC VEHICLE CHARGING
… environment while maintaining a favorable cost-performance tradeoff. Furthermore, a novel technique using metasurface-based coupling plates (referred to as ‘metacoupler’) to reduce the fringing electricfields outside the charging pads is also proposed. Different physical implementations of the …
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