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 104 for “"Portable devices"”.
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Low-power SAR ADC for biomedical portable devices
In energy constrained edge devices such as wireless sensor nodes, Internet of Things (IoT) devices and biomedical implants, ultra-low power operation is a critical consideration when operating from a lifetime battery or an energy harvesting source. In such applications, it is important to ensure …
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6.78MHz Omnidirectional Wireless Power Transfer System for Portable Devices Application
… power transfer; 5). soft switching of active devices. A LCCL-LC resonant converter is derived to satisfy all of the five requirements. In consumer electronics applications, Megahertz (MHz) WPT systems are used to improve the charging spatial freedom. 6.78 MHz is selected as the system …
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High energy density entrainment-based catalytic micro-combustor for portable devices in extreme environmental conditions
… of compact and lightweight combustion-based devices. In this work, we first optimized the catalytic bed segmentation scheme to enhance fuel management in a mesoscale parallel-plate combustor. After contextualizing the driving parameters for combustion efficiency, we developed an energy-dense …
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Design and control of photoflash capacitor charging circuits
… as high as 350V in low-voltage battery-powered portable devices. With the decreasing size of digital cameras, existing solutions are too large. This thesis will study the operation and losses of a flyback capacitor charger. Specifically, the thesis will focus on minimizing the solution size, …
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User generated content for IMS-based IPTV
… now connect to the internet with a variety of portable devices which are capable of performing multiple tasks. Due to this, services such as Voice over IP (VoIP), presence, social networks, instant messaging (IM) and Internet Protocol television (IPTV) to mention but a few, started to …
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Dynamic services in mobile ad hoc networks
The increasing diffusion of wireless-enabled portable devices is pushing toward the design of novel service scenarios, promoting temporary and opportunistic interactions in infrastructure-less environments. Mobile Ad Hoc Networks (MANET) are the general model of these higly dynamic networks that …
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Quality of service management for multimedia communications : investigations on usability of interfaces for desktop and portable systems
… and re-negotiating QoS on Desktop Systems and on Portable Devices – such as, Personal Digital Assistants (PDAs) and Mobile Phones. Conducting the usability tests for these interfaces required re-engineering of traditional usability testing processes – to improve the efficiency of performing each …
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Chemo and biodetection in liquid with organic transistor
… has made possible to conceive the realization of portable devices, i.e. chemical sensors capable to analyse small quantities in situ. Nowadays, the availability of portable devices allows to test those samples which are di�cult or impossible to transport for long distances without degradation. …
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Circuits and systems for efficient portable-to-portable wireless charging
In today's world of ever-increasing low-power portable electronics, from implants to wireless accessories, powering these devices efficiently and conveniently is an escalating issue. The proposed solution is to wirelessly recharge these lower-power portable devices through a common magnetic link …
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Low Power Demodulator Design for RFID Applications
… in today's digital and analog design for various portable devices. Radio frequency identification (RFID) is a technology which requires very low power and it uses electromagnetic waves in the radio frequency to transmit the ID of objects. It has a broad range of uses although inventory management …
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Pulsed nanosecond dielectric barrier discharge in nitrogen at atmospheric pressure
Small power devices are of strong interest as many electronics are made more compact. Those portable power sources are widely used in aerospace applications such as small UAVs and satellite thrusters. Typically, these portable devices rely on batteries, but small power generators based on …
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A Hydrogel Based Thermal Management System for Lithium-ion Batteries
Many portable devices such as soldier carried devices are powered by low-weight but high-capacity lithium ion (Li-ion) batteries. An effective battery thermal management (BTM) system is required to keep the batteries operating within a desirable temperature range with minimal variations, and thus …
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Stretchable, soft, and wireless biomedical electronics
… commonly take place outside the hospital with portable recording devices, but also contributes to development in neuroscience by enabling studies on neural activity with the help of an implantable neural interface. This thesis presents a soft, stretchable, and wireless biomedical electronics …
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IMU-Integrated 'Smart' Knee Brace Validation Using Optoelectronic Motion Capture During Treadmill Walking
… Inertial measurement units (IMUs) are small, portable devices that measure linear acceleration, angular velocity, and magnetic field and have been proven to be valid in measuring joint angles. A ‘smart’ brace was implemented with two IMUs and the knee joint angles calculated using data from …
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High-Speed, Low-Power 54-B X 54-B Digital Multiplier Architecture Using Redundant Binary
… candidate for low-power, high-speed, portable devices.
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Miniature HCCI Engine Compressor
… and are thus a desirable power supply for portable devices. A reliable lightweight long lasting power supply will be an enabler for human assist devices and miniature robotics. A prototype miniature free-piston engine compressor runs for up to 30 s. New pistons and cylinder liners with …
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Controlling coupling in an electrically steerable parasitic array
… varactors, avoiding the cost and complexity of devices like phase shifters. Past attempts to design multi-band ESPARs have often superimposed multiple antenna arrays, each scaled for a different frequency band. This often results in large, cluttered, complicated designs. To accommodate …
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Business plan of starting up a viral web service bridging online video with e-commerce In Chinese market
The proliferation of broadband network and smart portable devices dramatically change the video service consumption behavior of Chinese millennials who are quite different from elder generation. This thesis presents a business plan for launching a new web service VideoTag for them. Based on tablets …
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Achieving More with Less: Learning Generalizable Neural Networks With Less Labeled Data and Computational Overheads
… in resource-constrained environments involving portable devices. This dissertation aims to improve efficiency in machine learning by exploring different ways to learn generalizable neural networks that require less labeled data and computational resources. We demonstrate that using physics …
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Mobility management in 5G heterogeneous networks
… a result of widespread popularity and uptake of portable devices, such as smartphones, tablets and laptops. This growth has placed enormous stress on network service providers who are committed to offering the best quality of service to consumer groups. Consequently, telecommunication engineers …
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