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.
Results
Showing 1 to 20 of 58 for “"Technical challenge"”.
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Integrated Multiwavelength Semiconductor Lasers
The next technical challenge is to increase the number of lasing modes with as much control over the wavelength and linewidth as in today's single-wavelength semiconductor lasers. By utilizing multiple sections of periodic structures, dual-wavelength InGaAs-GaAs ridge waveguide semiconductor lasers …
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A Deep Learning Based Real-time Pedestrian Recognition System
… algorithms are combined to address this technical challenge. Our system is scalable to a large number of video feeds.
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A power electronic approach to improved dual-frequency vibration energy harvesting
… at both frequencies. This thesis addresses the technical challenge of achieving maximum power transfer from multi-frequency vibration energy sources, simultaneously. Improved dual-frequency energy harvesting is demonstrated using a piezoelectric vibration energy harvester loaded with …
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Tritium thermal desorption testing of nuclear graphites irradiated at fluoride-salt-cooled high-temperature reactor conditions
… and an Air-Brayton power cycle. A prominent technical challenge for the FHR is maintaining the release of tritium generated from neutron irradiation of flibe below acceptable levels. One proposed method for partitioning tritium from the salt is through adsorption onto graphite. Demonstrating …
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Return on investment and library complexity analysis for DNA sequencing
… in medical and population genetics. One known technical challenge and cost driver in next-generation sequencing data is the occurrence of non-independent observations that are created from sequencing artifacts and duplication events from polymerase chain reaction (PCR). The current study …
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Memristor Based Gain-Varying PI Control for Erbium-Doped Fiber Amplifiers (EDFAs)
… systems. Traditional control systems face challenges in control complexity and cost-effectiveness. This research addresses this challenge by introducing a novel approach—incorporating memristor-based Proportional-Integral (PI) controllers. The methodology involves integrating memristor into …
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Eulerian-Lagrangian stereo-to-multi-view Conversion
… 3D experience to multiple viewers. The main technical challenge that hampers the adaptation of this technology is the lack of multi-view content. We develop a real-time system that converts stereoscopic video to a high-quality, multi-view video, which can be directly fed to automultiscopic …
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Spatiotemporal Encoding Methods for Brain Magnetic Resonance Imaging
… of brain MRI are limited by the well-known technical challenge of MRI acquisition—low image encoding efficiency, leading to limited acquisition speed, spatial resolution and signal-to-noise ratio especially for in-vivo imaging. In order to address these challenges, this thesis presents newly …
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MultiView-Systeme zur explorativen Analyse unstrukturierter Information
… implements the system concept. One conceptional-technical challenge has been the adaptability of the reference technology for different application domains, business processes, and tasks. Therefore, the methods for tailoring the system and for measuring usefulness are considered important …
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Machine learning and task disambiguation in hand-picked agriculture
… detection during harvest still remains an open technical challenge. This thesis proposes and tests a pattern recognition approach to harvest mode recognition from GPS travel data collected from 4 volunteers for 2 days in Oxnard, California. Three profiles were created to characterize activities …
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New cryptographic protocols With side-channel attack security
… primitives resist "more" RKAs than others. A technical challenge was to achieve RKA security without assuming the class of allowed tampering functions is "claw-free"; this mathematical assumption fails to describe how tampering occurs in practice, but was made for all prior constructions in …
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A Synthesis and Optimization of Patented Direct Air Capture Technology
… levels in the air are only 0.04%, it presents a technical challenge. Ambient air has a concentration that is 2-4 orders of magnitude lower than other typically targeted sources for CO₂ capture, like flue gases from energy production and industrial activities. Nevertheless, direct air capture has …
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An MRI compatible manipulator for prostate cancer detection and treatment
… Resonance Imaging (MRI). This presents a technical challenge because it requires robotic assistance since there is very limited access to a patient inside the bore. Additionally, the high magnetic fields prohibit the use of conventional actuators in the procedure. Dielectric Elastomer …
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Tavarua : a mobile telemedicine system using WWAN striping
… a imobile node to a stationary location. The key technical challenge is transmitting high-bandwidth, loss-sensitive data over multiple low-bandwidth, lossy channels. We overcome these challenges using dynamic adjustment of the encoding parameters and a novel video encoding technique (grid …
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Development of Structural Health Monitoring Systems Incorporating Acoustic Emission Detection for Spacecraft and Wind Turbine Blades
… windmills, bridges, and aircraft. A major technical challenge for existing SHM systems is high power consumption, which severely limits the range of its applications. In this thesis, we investigated adoption of acoustic emission detection to reduce power dissipation of SHM systems employing …
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Configuration Validation of a Novel In-Space Propellant Storage and Transfer System
… liquids in space involves considerable technical challenge due to high vacuum and potential zero gravity environment. In order to raise the technology readiness level of this system, experimental study was conducted on (a) system dynamics, (b) mass gauging, (c) CFD analysis. The …
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Making Sense of the Space Between: A Qualitative Study of Therapist’s Experience and Use of Therapeutic Enactments
… study sought to examine a particular category of technical challenge in therapy: enactments. Enactments, broadly defined, are moments or stretches of time in therapy where both the patient and therapist cannot put their conflicts into words, and instead act them out within the therapeutic milieu. …
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Magnetostrictive Particle Tagging of Epoxy and Epoxy Composites for Self Assessment of Damage
… process of polymer matrix composite poses a technical challenge for their introduction in structural applications. Thus, there is a critical need to develop new techniques to monitor the health of structural composites on a continuous basis. Inspired by diagnostic techniques used in …
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Imaging Glioblastoma metabolism using mass spectrometry imaging
… metabolic subtypes. An outstanding question and technical challenge is to visualize the metabolism of a tumour within its native microenvironment and understand to what extent its metabolism is driven by the microenvironment. Using isotope tracing and mass spectrometry imaging (MSI), I identified …
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Technically superior but unloved : a multi-faceted perspective on multi-core's failure to meet expectations in embedded systems
… from several vendors now offer several technical advantages over single-core architectures. However, despite these advantages, adoption of multi-core processors in embedded systems has fallen short of expectations and not increased significantly in the last 3-4 years. There are several …
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