Дисертації з теми "Interface devices"
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1
Devi, M. K. Sowmia Agrawal Prathima. "Interface selection in multi-interface mobile devices." Auburn, Ala., 2006. http://repo.lib.auburn.edu/2006%20Summer/Theses/MYLAPORE_KRISHNA_8.pdf.
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2
Thong, Yee Keat. "A novel computer interface tool using low cost inertial sensors." Thesis, University of Nottingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246360.
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3
Pachoumi, Olympia. "Metal oxide/organic interface investigations for photovoltaic devices." Thesis, University of Cambridge, 2014. https://www.repository.cam.ac.uk/handle/1810/246263.
Повний текст джерелаАнотація:
This thesis outlines investigations of metal oxide/organic interfaces in photo-voltaic devices. It focuses on device instabilities originating from the metal oxide layer surface sensitivity and it presents suggested mechanisms behind these in- stabilities. A simple sol-gel solution deposition technique for the fabrication of stable and highly performing transparent conducting mixed metal oxides (ZnMO) is presented. It is demonstrated that the use of amorphous, mixed metal oxides allows improving the performance and stability of interfacial charge extraction layers for organic solar cells. Two novel ternary metal oxides, zinc-strontrium- oxide (ZnSrO) and zinc-barium-oxide (ZnBaO), were fabricated and their use as electron extraction layers in inverted organic photovoltaics is investigated. We show that using these ternary oxides can lead to superior devices by: prevent- ing a dipole forming between the oxide and the active organic layer in a model ZnMO/P3HT:PCBM OPV as well as lead to improved surface coverage by a self assembled monolayer and promote a significantly improved charge separation efficiency in a ZnMO/P3HT hybrid device. Additionally a spectroscopic technique allowing a versatility of characterisa- tion for long-term stability investigations of organic solar cells is reported. A device instability under broadband light exposure in vacuum conditions for an inverted ZnSrO/PTB7:PC71BM OPV is observed. Direct spectroscopic evidence and electrical characterisation indicate the formation of the PC71BM radical an- ion associated with a loss in device performance. A charge transfer mechanism between a heavily doped oxide layer and the organic layers is suggested and dis- cussed.
4
Sanderson, Brett Matthew. "Interface control in small molecule organic photovoltaic devices." Thesis, Imperial College London, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.442000.
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5
Kratz, Sven. "Sensor-based user interface concepts for continuous, around-device and gestural interaction on mobile devices." Diss., lmu, 2012. http://nbn-resolving.de/urn:nbn:de:bvb:19-152202.
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6
Cheung, Hon Lung. "Multimedia video interface controller for silicon microdisplay application /." View Abstract or Full-Text, 2002. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202002%20CHEUNG.
Повний текст джерелаАнотація:
Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2002.Includes bibliographical references (leaves [61]-[65]). Also available in electronic version. Access restricted to campus users.
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Bridle, Robert Angus, and robert bridle@gmail com. "Adaptive User Interfaces for Mobile Computing Devices." The Australian National University. College of Engineering and Computer Sciences, 2008. http://thesis.anu.edu.au./public/adt-ANU20081117.184430.
Повний текст джерелаАнотація:
This thesis examines the use of adaptive user interface elements on a mobile phone and presents two adaptive user interface approaches. The approaches attempt to increase the efficiency with which a user interacts with a mobile phone, while ensuring the interface remains predictable to a user.
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An adaptive user interface approach is presented that predicts the menu item a user will select. When a menu is opened, the predicted menu item is highlighted instead of the top-most menu item. The aim is to maintain the layout of the menu and to save the user from performing scrolling key presses. A machine learning approach is used to accomplish the prediction task. However, learning in the mobile phone environment produces several difficulties. These are limited availability of training examples, concept drift and limited computational resources. A novel learning approach is presented that addresses these difficulties. This learning approach addresses limited training examples and limited computational resources by employing a highly restricted hypothesis space. Furthermore, the approach addresses concept drift by determining the hypothesis that has been consistent for the longest run of training examples into the past. Under certain concept drift restrictions, an analysis of this approach shows it to be superior to approaches that use a fixed window of training examples. An experimental evaluation on data collected from several users interacting with a mobile phone was used to assess this learning approach in practice. The results of this evaluation are reported in terms of the average number of key presses saved. The benefit of menu-item prediction can clearly be seen, with savings of up to three key presses on every menu interaction.
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An extension of the menu-item prediction approach is presented that removes the need to manually specify a restricted hypothesis space. The approach uses a decision-tree learner to generate hypotheses online and uses the minimum description length principle to identify the occurrence of concept shifts. The identification of concept shifts is used to guide the hypothesis generation process. The approach is compared with the original menu-item prediction approach in which hypotheses are manually specified. Experimental results using the same datasets are reported.
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Another adaptive user interface approach is presented that induces shortcuts on a mobile phone interface. The approach is based on identifying shortcuts in the form of macros, which can automate a sequence of actions. A means of specifying relevant action sequences is presented, together with several learning approaches for predicting which shortcut to present to a user. A small subset of the possible shortcuts on a mobile phone was considered. This subset consisted of shortcuts that automated the actions of making a phone call or sending a text message. The results of an experimental evaluation of the shortcut prediction approaches are presented. The shortcut prediction process was evaluated in terms of predictive accuracy and stability, where stability was defined as the rate at which predicted shortcuts changed over time. The importance of stability is discussed, and is used to question the advantages of using sophisticated learning approaches for achieving adaptive user interfaces on mobile phones. Finally, several methods for combining accuracy and stability measures are presented, and the learning approaches are compared with these methods.
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Pérez, Martín. "Conditional resource management for mobile devices." Universidade Tecnológica Federal do Paraná, 2014. http://repositorio.utfpr.edu.br/jspui/handle/1/1036.
Повний текст джерелаАнотація:
Dispositivos móveis, como os tablets e smartphones, ficam mais populares a cada dia. Esta nova classe de dispositivos está evoluindo constantemente em suas capacidades computacionais, permitindo os usuários trocarem computadores maiores por estes dispositivos móveis menores. Diariamente novas aplicações para estes dispositivos são desenvolvidas e publicadas em repositórios de software, possibilitando que os usuários instalem e se beneficiem de novos aplicativos rapidamente. Para gerenciar múltiplas requisições de recursos de diferentes aplicações rodando em paralelo, o design de gestão de recursos do sistema operacional desempenha um papel chave. A vasta maioria dos gerentes de recursos disponíveis nos dispositivos móveis são projetados para maximizar o desempenho do sistema como um todo, nem sempre levando em consideração as características dos processos solicitando recursos na camada de aplicação. Este tipo de estratégia pode levar a casos onde algumas aplicações experimentem tempos de latência mais longos que os desejados durante os acessos aos recursos, comprometendo a Qualidade de Serviço ou a segurança do sistema. Este trabalho tem por objetivo oferecer um novo modelo de gerência de recursos para dispositivos móveis, permitindo a criação de regras que priorizem a alocação de recursos para aplicações específicas de acordo com suas necessidades. Além disso foi implementado um prototótipo como prova de conceito deste modelo, usando a plataforma Android, para confirmando a viabilidade do mesmo.Mobile devices, such as smartphones and tablets, are becoming more popular everyday. This new devices class is constantly evolving on what concerns computing capabilities, allowing users to switch from larger computers to smaller mobile devices in several cases. Everyday new apps for these devices are developed and published in software repositories, enabling users to quickly install and benefit from new software. In order to deal with the multiple resource requests from different applications running in parallel, the operating system’s resource management design plays a key role. Most resource managers available to mobile phones are designed to maximize the performance of the system as a whole, not always taking into account the characteristics of the processes requiring resources in the application layer. This type of strategy can lead to cases where some applications experience longer latencies than desired while accessing resources, compromising the Quality of Service or system security. This work aims to offer a new resource management model for mobile devices, allowing the creation of rules that can prioritize the resource allocation for specific applications according to their needs. Also it implemented a proof of concept prototype version of this model, using the Android platform, confirming its viability.
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Jadhav, Shraddha. "Accounting of energy consumption from Wi-Fi interface in portable devices." Thesis, Wichita State University, 2010. http://hdl.handle.net/10057/3725.
Повний текст джерелаАнотація:
Various reports about greenhouse emissions over the past decade have raised the global consciousness regarding worldwide energy consumption in various arenas. The time has come to adopt energy-efficient methods in all areas, including computing devices. The need for energy efficiency in portable computing and communication devices is great, first due to the fact that because their usage has been increasing exponentially and, second, because little has been done in this field, with performance still being tracked as the focal point of development. One of the major features of any portable device is the wireless communication interface (typically a Wi-Fi card), with many applications being based on the Internet. A major concern with portable devices is maintaining a battery charge for long periods of time. All major applications like the voice over Internet protocol (VOIP), file transfer protocol (FTP), and video conferencing deplete a large amount of energy from portable devices. Thus, accounting for the energy consumption of the Wi-Fi card is very important, both to improve the battery lifetimes of these devices in the future and to reduce the amount of energy consumed from the power grid to charge these batteries.
In this thesis, the energy consumption of the Wi-Fi interface in portable devices, such as laptops and smartphones, was calculated for various applications. Energy consumption was measured experimentally and then scaled to account for the large number of devices in use. The carbon footprint was calculated and the offset required was determined. Considering the explosive growth in the number of portable devices in use, projections on energy consumption over the next few years were made.Thesis (M.S.)--Wichita State University, College of Engineering, Dept. of Electrical Engineering and Computer Science.
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Nakazawa, Satoshi. "Interface Charge Engineering in AlGaN/GaN Heterostructures for GaN Power Devices." Kyoto University, 2019. http://hdl.handle.net/2433/244553.
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11
Li, Sheng-han. "Organic-metal interface formation and its applications in organic electronic devices." Diss., Restricted to subscribing institutions, 2008. http://proquest.umi.com/pqdweb?did=1667991421&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.
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Li, Stella. "Interface state generation induced by Fowler-Nordheim tunneling in mos devices /." Hong Kong : University of Hong Kong, 1999. http://sunzi.lib.hku.hk/hkuto/record.jsp?B20566487.
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Budak, Ronya, and Bergman Ted Klein. "Identifying effectiveness of different input devices as pointing devices for graphical user interfaces." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-232170.
Повний текст джерелаАнотація:
As new input devices are introduced to the technological market and an increasing part of the population are familiar with the usage of digital devices, it may seem difficult to know which input devices to aim for when developing new programs and applications that use graphical interfaces. According to a previous study in this area, the computer mouse was the most preferred and performed best when tested in speed and accuracy when compared to the keyboard and drawing tablet even though the keyboard was the device most were familiar with. This paper attempted to recreate the study with the exception of testing morethings, such as number of miss-clicks, distance travelled, directional changes and time. The keyboard was replaced by a handheld controller as well. The results were that the mouse performed best yet again, and proved to be easy to use efficiently for both new and experienced users. The handheld controller was shown not to be an optimal pointing device, mostly due to it being stuck to a fixed speed and not able to accelerate. It did well in the matter of amount off miss-clicks and directional changes, which can be tied to its slow speed. The drawing tablet was well received by the new users and experienced as more accurate than the handheld device. Its results suggest that the drawing tablet could be an efficient pointing device than proven here in the hands of an experienced user, but for new users it could not perform as well as the mouse device overall.Eftersom nya inmatningsenheter introduceras på den tekniska marknaden och en större del av befolkningen bekantar sig med användningen av digitala enheter, kan det verka svårt att veta vilka inmatningsenheter man ska rikta sig till när man utvecklar nya program och applikationer som använder grafiskt gränssnitt. Enligt en tidigare studie var datormusen den mest föredragna enheten och fick bäst resultat inom snabbhet och noggrannhet, jämfört med tangentbordet och ritplattan inom detta område, trots att tangentbordet var den enhet som de flesta var bekanta med. Denna undersökning försökte återskapa studien med undantaget att testa flera egenskaper, såsom antal missade klickar, avstånd, byten av färdriktning och tid samt att tangentbordet ersattes av en handhållen kontroller. Resultaten var att musen presterade bäst än en gång och visade sig vara lätt att använda effektivt för både nya och erfarna användare. Den handhållna styrenheten visade sig inte vara en optimal pekdon, främst på grund av att den hade en bestämd hastighet och inte kunde accelerera. Det gick bra i fråga om mängden missade klickar och riktningsförändringar, som kan vara knutna till dess långsamma hastigheten. Ritplattan mottogsväl av de nya användarna och upplevdes som mer exakt än den handhållna enheten. Resultatet tyder på att ritplattan kan vara en effektiv pekdon i händerna på en erfaren användare än bevisat här, men för nya användare kan det inte fungera lika bra som datormusen överlag.
14
Mao, Yu-lung. "Novel high-K gate dielectric engineering and thermal stability of critical interface /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.
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Stålnacke, Daniel. "Designing and Implementing Communication and a Graphical Interface for Antenna Test Devices." Thesis, Umeå University, Department of Computing Science, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-33772.
Повний текст джерелаАнотація:
Esrange Space Center, located in Kiruna, is a company which specializes in the area of satellite service as well as rocket and balloon launches. To communicate with the satellites Esrange use antennas that is between eight and thirteen meters in diameter. The antennas must always be ready to operate which is why there is a need for an application to test the antennas when they are not used.This master's thesis work aims to develop such a system that tests the antennas when they are not communicating with satellites. This report contains background information about the problem and system requirements as well as the solution and description of the developed system. It also contains an in-depth study about similar applications that has been developed by others.To solve the problem, a client-server application was developed. The server controls the test devises used to test the antennas and the client gives the users a GUI to control the server and its functions. An automated system called OASIS, developed at Esrange, was included in the solution to make it possible to automate some of the core tests.
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Ahmadi, Danesh Ashtiani Ali. "ProGes: A User Interface for Multimedia Devices over the Internet of Things." Thesis, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/31865.
Повний текст джерелаАнотація:
With the rapid growth of online devices, a new concept of Internet of Things (IoT) is emerging in which everyday devices will be connected to the Internet. As the number of devices in IoT is increasing, so is the complexity of the interactions between user and devices. There is a need to design intelligent user interfaces that could assist users in interactions. Many studies have been conducted on different interaction techniques such as proxemic and gesture interaction in order to propose an intuitive and intelligent system for controlling multimedia devices over the IoT, though most could not propose a universal solution. The present study proposes a proximity-based and gesture-enabled user interface for multimedia devices over IoT. The proposed method employs a cloud-based decision engine to support user to choose and interact with the most appropriate device, reliving the user from the burden of enumerating available devices manually. The decision engine observes the multimedia content and device properties, learns user preferences adaptively, and automatically recommends the most appropriate device to interact. In addition to that, the proposed system uses proximity information to find the user among people and provides her/him gesture control services. Furthermore, a new hand gesture vocabulary is proposed for controlling multimedia devices through conducting a multiphase elicitation study. The main advantage of this vocabulary is that it can be used for all multimedia devices. Both device recommendation system and gesture vocabulary are evaluated. The device recommendation system evaluation shows that the users agree with the proposed interaction 70% of the times. Moreover, the average agreement score of the proposed gesture vocabulary (0.56) exceeds the score of similar studies. An external user evaluation study shows that the average score of being a good-match is 4.08 out of 5 and the average of ease-of-performance equals to 4.21 out of 5. The memory test reveals that the proposed vocabulary is easy to remember since participants could remember and perform gestures in 3.13 seconds on average. In addition to that, the average accuracy of remembering gestures equals to 91.54%.
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Martin, C. M. "Modelling the Effect of the Interface Morphology in Organic-Inorganic Photovoltaic Devices." Thesis, University of Oxford, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.504434.
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Mirbozorgi, Seyed Abdollah. "High-performance wireless power and data transfer interface for implantable medical devices." Doctoral thesis, Université Laval, 2015. http://hdl.handle.net/20.500.11794/26209.
Повний текст джерелаАнотація:
D’importants progès ont été réalisés dans le développement des systèmes biomédicaux implantables grâce aux dernières avancées de la microélectronique et des technologies sans fil. Néanmoins, ces appareils restent difficiles à commercialier. Cette situation est due particulièrement à un manque de stratégies de design capable supporter les fonctionnalités exigées, aux limites de miniaturisation, ainsi qu’au manque d’interface sans fil à haut débit fiable et faible puissance capable de connecter les implants et les périphériques externes. Le nombre de sites de stimulation et/ou d’électrodes d’enregistrement retrouvés dans les dernières interfaces cerveau-ordinateur (IMC) ne cesse de croître afin d’augmenter la précision de contrôle, et d’améliorer notre compréhension des fonctions cérébrales. Ce nombre est appelé à atteindre un millier de site à court terme, ce qui exige des débits de données atteingnant facilement les 500 Mbps. Ceci étant dit, ces travaux visent à élaborer de nouvelles stratégies innovantes de conception de dispositifs biomédicaux implantables afin de repousser les limites mentionnées ci-dessus. On présente de nouvelles techniques faible puissance beaucoup plus performantes pour le transfert d’énergie et de données sans fil à haut débit ainsi que l’analyse et la réalisation de ces dernières grâce à des prototypes microélectroniques CMOS. Dans un premier temps, ces travaux exposent notre nouvelle structure multibobine inductive à résonance présentant une puissance sans fil distribuée uniformément pour alimenter des systèmes miniatures d’étude du cerveaux avec des models animaux en ilberté ainsi que des dispositifs médicaux implantbles sans fil qui se caractérisent par une capacité de positionnement libre. La structure propose un lien de résonance multibobines inductive, dont le résonateur principal est constitué d’une multitude de résonateurs identiques disposés dans une matrice de bobines carrées. Ces dernières sont connectées en parallèle afin de réaliser des surfaces de puissance (2D) ainsi qu’une chambre d’alimentation (3D). La chambre proposée utilise deux matrices de résonateurs de base, mises face à face et connectés en parallèle afin d’obtenir une distribution d’énergie uniforme en 3D. Chaque surface comprend neuf bobines superposées, connectées en parallèle et réailsées sur une carte de circuit imprimé deux couches FR4. La chambre dispose d’un mécanisme naturel de localisation de puissance qui facilite sa mise en oeuvre et son fonctionnement. En procédant ainsi, nous évitons la nécessité d’une détection active de l’emplacement de la charge et le contrôle d’alimentation. Notre approche permet à cette surface d’alimentation unique de fournir une efficacité de transfert de puissance (PTE) de 69% et une puissance délivrée à la charge (PDL) de 120 mW, pour une distance de séparation de 4 cm, tandis que le prototype de chambre complet fournit un PTE uniforme de 59% et un PDL de 100 mW en 3D, partout à l’intérieur de la chambre avec un volume de chambre de 27 × 27 × 16 cm3. Une étape critique avant d’utiliser un dispositif implantable chez les humains consiste à vérifier ses fonctionnalités sur des sujets animaux. Par conséquent, la chambre d’énergie sans fil conçue sera utilisée afin de caractériser les performances d’ une interface sans fil de transmisison de données dans un environnement réaliste in vivo avec positionement libre. Un émetteur-récepteur full-duplex (FDT) entièrement intégré qui se caractérise par sa faible puissance est conçu pour réaliser une interfaces bi-directionnelles (stimulation et enregistrement) avec des débits asymétriques: des taux de tramnsmission plus élevés sont nécessaires pour l’enregistrement électrophysiologique multicanal (signaux de liaison montante) alors que les taux moins élevés sont utilisés pour la stimulation (les signaux de liaison descendante). L’émetteur (TX) et le récepteur (RX) se partagent une seule antenne afin de réduire la taille de l’implant. L’émetteur utilise la radio ultra-large bande par impulsions (IR-UWB) basée sur l’approche edge combining et le RX utilise la bande ISM (Industrielle, Scientifique et Médicale) de fréquence central 2.4 GHz et la modulation on-off-keying (OOK). Une bonne isolation (> 20 dB) est obtenue entre le TX et le RX grâce à 1) la mise en forme les impulsions émises dans le spectre UWB non réglementée (3.1-7 GHz), et 2) le filtrage espace-efficace (évitant l’utilisation d’un circulateur ou d’un diplexeur) du spectre du lien de communication descendant directement au niveau de l’ amplificateur à faible bruit (LNA). L’émetteur UWB 3.1-7 GHz utilise un e modultion OOK ainsi qu’une modulation par déplacement de phase (BPSK) à seulement 10.8 pJ / bits. Le FDT proposé permet d’atteindre 500 Mbps de débit de données en lien montant et 100 Mbps de débit de données de lien descendant. Il est entièrement intégré dans un procédé TSMC CMOS 0.18 um standard et possède une taille totale de 0.8 mm2. La consommation totale d’énergie mesurée est de 10.4 mW (5 mW pour RX et 5.4 mW pour TX au taux de 500 Mbps).In recent years, there has been major progress on implantable biomedical systems that support most of the functionalities of wireless implantable devices. Nevertheless, these devices remain mostly restricted to be commercialized, in part due to weakness of a straightforward design to support the required functionalities, limitation on miniaturization, and lack of a reliable low-power high data rate interface between implants and external devices. This research provides novel strategies on the design of implantable biomedical devices that addresses these limitations by presenting analysis and techniques for wireless power transfer and efficient data transfer. The first part of this research includes our proposed novel resonance-based multicoil inductive power link structure with uniform power distribution to wirelessly power up smart animal research systems and implanted medical devices with high power efficiency and free positioning capability. The proposed structure consists of a multicoil resonance inductive link, which primary resonator array is made of several identical resonators enclosed in a scalable array of overlapping square coils that are connected in parallel and arranged in power surface (2D) and power chamber (3D) configurations. The proposed chamber uses two arrays of primary resonators, facing each other, and connected in parallel to achieve uniform power distribution in 3D. Each surface includes 9 overlapped coils connected in parallel and implemented into two layers of FR4 printed circuit board. The chamber features a natural power localization mechanism, which simplifies its implementation and eases its operation by avoiding the need for active detection of the load location and power control mechanisms. A single power surface based on the proposed approach can provide a power transfer efficiency (PTE) of 69% and a power delivered to the load (PDL) of 120 mW, for a separation distance of 4 cm, whereas the complete chamber prototype provides a uniform PTE of 59% and a PDL of 100 mW in 3D, everywhere inside the chamber with a chamber size of 27×27×16 cm3. The second part of this research includes our proposed novel, fully-integrated, low-power fullduplex transceiver (FDT) to support bi-directional neural interfacing applications (stimulating and recording) with asymmetric data rates: higher rates are required for recording (uplink signals) than stimulation (downlink signals). The transmitter (TX) and receiver (RX) share a single antenna to reduce implant size. The TX uses impulse radio ultra-wide band (IR-UWB) based on an edge combining approach, and the RX uses a novel 2.4-GHz on-off keying (OOK) receiver. Proper isolation (> 20 dB) between the TX and RX path is implemented 1) by shaping the transmitted pulses to fall within the unregulated UWB spectrum (3.1-7 GHz), and 2) by space-efficient filtering (avoiding a circulator or diplexer) of the downlink OOK spectrum in the RX low-noise amplifier (LNA). The UWB 3.1-7 GHz transmitter using OOK and binary phase shift keying (BPSK) modulations at only 10.8 pJ/bit. The proposed FDT provides dual band 500 Mbps TX uplink data rate and 100 Mbps RX downlink data rate. It is fully integrated on standard TSMC 0.18 nm CMOS within a total size of 0.8 mm2. The total power consumption measured 10.4 mW (5 mW for RX and 5.4 mW for TX at the rate of 500 Mbps).
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Light, Geraldine. "User-Centered Design Strategies for Clinical Brain-Computer Interface Assistive Technology Devices." ScholarWorks, 2019. https://scholarworks.waldenu.edu/dissertations/6349.
Повний текст джерелаАнотація:
Although in the past 50 years significant advances based on research of brain-computer interface (BCI) technology have occurred, there is a scarcity of BCI assistive technology devices at the consumer level. This multiple case study explored user-centered clinical BCI device design strategies used by computer scientists designing BCI assistive technologies to meet patient-centered outcomes. The population for the study encompassed computer scientists experienced with clinical BCI assistive technology design located in the midwestern, northeastern, and southern regions of the United States, as well as western Europe. The multi-motive information systems continuance model was the conceptual framework for the study. Interview data were collected from 7 computer scientists and 28 archival documents. Guided by the concepts of user-centered design and patient-centered outcomes, thematic analysis was used to identify codes and themes related to computer science and the design of BCI assistive technology devices. Notable themes included customization of clinical BCI devices, consideration of patient/caregiver interaction, collective data management, and evolving technology. Implications for social change based on the findings from this research include focus on meeting individualized patient-centered outcomes; enhancing collaboration between researchers, caregivers, and patients in BCI device development; and reducing the possibility of abandonment or disuse of clinical BCI assistive technology devices.
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Villaroman, Norman. "Face Tracking User Interfaces Using Vision-Based Consumer Devices." BYU ScholarsArchive, 2013. https://scholarsarchive.byu.edu/etd/3941.
Повний текст джерелаАнотація:
Some individuals have difficulty using standard hand-manipulated input devices such as a mouse and a keyboard effectively. For such users who at the same time have sufficient control over face and head movement, a robust perceptual or vision-based user interface that can track face movement can significantly help them. Using vision-based consumer devices makes such a user interface readily available and allows its use to be non-intrusive. Designing this type of user interface presents some significant challenges particularly with accuracy and usability. This research investigates such problems and proposes solutions to create a usable and robust face tracking user interface using currently available state-of-the-art technology. In particular, the input control in such an interface is divided into its logical components and studied one by one, namely, user input, capture technology, feature retrieval, feature processing, and pointer behavior. Different options for these components are studied and evaluated to see if they contribute to more efficient use of the interface. The evaluation is done using standard tests created for this purpose. The tests were done by a single user. The results can serve as a precursor to a full-scale usability study, various improvements, and eventual deployment for actual use. The primary contributions of this research include a logical organization and evaluation of the input process and its different components in face tracking user interfaces, a common library for computer control that can be used by various face tracking engines, an adaptive pointing input style that makes pointing using natural movement easier, and a test suite that can be used to measure performance of various user interfaces for desktop systems.
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Yamashita, Naoto. "Study on the Physics of Metal/Si Interfaces in Si-based Spin Devices." Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/265203.
Повний текст джерелаАнотація:
付記する学位プログラム名: 京都大学卓越大学院プログラム「先端光・電子デバイス創成学」京都大学
新制・課程博士
博士(工学)
甲第23431号
工博第4886号
新制||工||1764(附属図書館)
京都大学大学院工学研究科電子工学専攻
(主査)教授 白石 誠司, 教授 木本 恒暢, 教授 引原 隆士
学位規則第4条第1項該当
Doctor of Philosophy (Engineering)
Kyoto University
DGAM
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Shafqat, Adnan. "Mobile Usability of Intelligent Electronic Devices." Thesis, Blekinge Tekniska Högskola, Institutionen för datalogi och datorsystemteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-10526.
Повний текст джерелаАнотація:
Context: The Human Machine Interface (HMI) for Intelligent Electronic Devices (IEDs) is limited in its capability and is often the most common cause of failure when interacting with devices. A new approach to interact with these devices is needed with focus on improving interaction and effective visualization of information. Objectives: In this thesis, we investigate and propose a solution to visualize data of existing IED in interactive way. A mobile based prototype is proposed to list alarms, events and disturbances. Further single line diagram shown with capability to switch controls. Objective of proposed solution is to investigate specific use of mobile device from the perspective of usability and compare the new prototype with existing use of IED monochrome screen interface. Methods: Mixed approach based on qualitative and quantitative methods is conducted for analysis of the problem, method and approach to solve the problems in the domain of Substation automation. Analysis of the problem was carried out with the literature review of the technical documentation of IEDs. Experiments are performed in real environment to test and verify the usability of prototype. Results: Experiments results of proposed solution indicate that new approach is acceptable. The interfaces developed in mobile provide better results than traditional interfaces of IED. The difference between them is significant. Conclusions: We conclude that mobile usability gives better interaction, freedom, visualization of information and enhance the users’ experience by providing context specific information as compared to the existing Local Human Machine Interface of Intelligent Electronic Devices. The study provides strong results that recent developments of mobile technologies have revolutionized users’ possibilities to access information in an easy and better way.
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Аврунін, О. Г., Т. В. Носова, and В. В. Семенець. "Experience of Developing a Laboratory Base for the Study of Modern Microprocessor Systems." Thesis, NURE, MC&FPGA, 2019. https://mcfpga.nure.ua/conf/2019-mcfpga/10-35598-mcfpga-2019-001.
Повний текст джерелаАнотація:
A laboratory workshop was developed, consisting of a series of works aimed at studying and studying the principles of microcontroller programming, practical implementation of interaction with sensors, organization of work with input / output devices, and development of interface devices. By changing sensors that are connected to laboratory mockups or real equipment, and reprogramming the micro-controller system, you can perform laboratory work on almost all engineering profile courses.
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Zhao, Tong. "Designing a Mobile Reading User Interface for Aging Populations." Kent State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=kent152422790328748.
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Maric, Danilo. "Firmware development of a User Interface on medical devices of DIMA ITALIA Srl." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.
Знайти повний текст джерелаАнотація:
This dissertation was written based on an internship experience at Dima Italia Srl, a leader in designing, production and marketing of medical ventilators. Once these ventilators were simple machines for breathing support, manually pumping the air in and out. Today, medical ventilators are computerized machines, electronically controlled by a small embedded system. They feature a plethora of available modes and an easy-to-use graphical interface. Exactly this is the topic of the thesis: developing a firmware with graphical interface for the next ventilator, produced and sold by Dima Italia. The firmware is based on C++ language and was developed in a Qt Creator framework, ideal for developing applications with graphical interfaces on Linux-based devices. In the paper are found all the pages of the firmware, along with the logic of operation of the application. Moreover, all the details about the operation and modes of a medical ventilator are also found in the document. In the end, there's a section related to deployment of a Qt application on a device, along with the issues and bugs encountered during the development process.
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Chiabrera, Francesco Maria. "Interface Engineering in Mixed Ionic Electronic Conductor Thin Films for Solid State Devices." Doctoral thesis, Universitat de Barcelona, 2019. http://hdl.handle.net/10803/667601.
Повний текст джерелаАнотація:
Interface-dominated materials such as nanocrystalline thin films have emerged as an enthralling class of materials able to engineer functional properties of transition metal oxides widely used in energy and information technologies. In this direction, it has been recently proved that grain boundaries (GBs) in the perovskite La1-xSrxMnO3±δ (manganite) deeply impact its functional properties, boosting the oxygen mass transport while abating the electronic and magnetic order. The impact of grain boundary in nanocrystalline thin films is so relevant to radically change the behaviour of the material, transforming an electronic conductor into a mixed ionic-electronic conductor functional for redox-based solid state devices. Based on these preliminary studies, it became crucial to understand the origin of this enhancement, in order to gain engineering capabilities and potentially extend it to other functional perovskite materials.
Following this approach, this thesis focuses in analysing the remarkable properties of GBs in manganites and, ultimately, investigating the possibility of engineering these interfaces. First, the structural and chemical characterization of the LSM thin films deposited by pulsed laser deposition (PLD) is presented. The compositional analysis of the layers revealed a severe Mn deficiency, ascribed to the plasma-background interactions during the deposition. The analysis of the GBs of these Mn-deficient thin films revealed a remarkable local modification of ionic composition, consisting in a Mn and O depletion along with a La and Sr enrichment (viz. GBdef). Then, through a PLD combinatorial approach, Mn was progressively inserted in the perovskite structure, altering the overall cationic ratio of the thin films (Mn/(La+Sr)). The variation of cationic chemical potential of the thin films was observed to significantly affect the GB composition, which passed from Mn depletion (La-enrichment) to Mn enrichment (La-depletion), while maintaining an O deficiency character (viz. GBrich). This behaviour suggests that through the tuning of the overall cationic concentration in the thin films the GB composition can be altered, offering an innovative way for engineering chemical defects in strained interfaces.
The effect of these different GBs on the electrical conductivity and the oxygen mass transport properties of LSM thin films with different Mn content was then measured. It was found that in the layers characterized by GBdef, the lack of Mn hinders the low temperature metal insulator transition and, in its place, a variable range hopping mechanism occurs, where electrons tunnels across the GBs for reaching distant Mn atoms. Moreover, a simultaneous decrease of activation energies of both GB oxygen diffusivity and GB oxygen surface exchange coefficient was observed further decreasing the Mn concentration in these thin films, indicating a strong interdependence between the two phenomena. The results suggest that the GB accumulation of oxygen vacancies is at the origin of the large improvement of both oxygen mass transport parameters observed in LSM polycrystalline thin films.
In LSM thin films characterized by GBrich, the low temperature metallic behaviour is progressively restored and an increase of electronic conductivity is observed in the entire temperature range. Additionally, in these layers relative changes of Mn do not give rise to a variation of the oxygen diffusivity, meaning that the GBs oxygen vacancy concentration is not altered anymore. Overall, the results demonstrate the possibility of engineering the functional properties of LSM polycrystalline thin films by modifying the GB cationic composition.
In the third part of the thesis, the effect of Co substitution on LSMC functional properties was investigated. The LSMC thin films were produced by combinatorial PLD, which allow a direct measure of real-continuous spread LSMC system. The oxygen mass transport properties of bulk and GB were evaluated by finite element model fitting of 18O exchange profiles. The results revealed that GBs enhance the transport properties of the whole material in the range of composition under study, although for high Co concentration the GB effect is concealed by the high bulk diffusion.
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Min, Byoung-Chul. "Interface engineering of spin-tunnel contacts to silicon towards silicon-based spintronic devices /." University of Twente [Host], 2007. http://doc.utwente.nl/57923.
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Elsafty, Aisha Mohamed-Salama. "A naming and trust approach for seamless handover in multiple-interface mobile devices." Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648173.
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Wei, Chen. "A novel interface for first person shooter games on personal digital assistant devices." Master's thesis, University of Cape Town, 2008. http://hdl.handle.net/11427/6368.
Повний текст джерелаАнотація:
Includes abstract.Includes bibliographical references (leaves 71-73).
The main aim of this study is to enhance the playability of games on current standard PDA devices. The newly designed interface more effectively leverages current well-established devices, which solves the problem of rapidly and accurately executing a large number of gaming commands. The outcomes of this research are beneficial for interface design of mobile applications.
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Drees, Martin. "Polymer/Fullerene Photovoltaic Devices - Nanoscale Control of the Interface by Thermally-controlled Interdiffusion." Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/27823.
Повний текст джерелаАнотація:
In this thesis, the interface between the electron donor polymer and the electron acceptor fullerene in organic photovoltaic devices is studied. Starting from a bilayer system of donor and acceptor materials, the proximity of polymer and fullerene throughout the bulk of the devices is improved by inducing an interdiffusion of the two materials by heating the devices in the vicinity of the glass transition temperature of the polymer. In this manner, a concentration gradient of polymer and fullerene throughout the bulk is created. The proximity of a fullerene within 10 nm of any photoexcitation in the polymer ensures that the efficient charge separation occurs. Measurements of the absorption, photoluminescence, and photocurrent spectra as well as I-V characteristics are used to study the interdiffusion and its influence on the efficiency of the photovoltaic devices. In addition, the film morphology is studied on a microscopic level with transmission electron microscopy and with Auger spectroscopy combined with ion beam milling to create a depth profile of the polymer concentration in the film.
Initial studies to induce an interdiffusion were done on poly(2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene) (MEH-PPV) as the electron donor polymer and the buckminsterfullerene C60 as the electron acceptor. Interdiffused devices show an order of magnitude photoluminescence quenching with concomitant increase in the photocurrents by an order of magnitude. Variation of the polymer layer thickness shows that the photocurrents increase with decreasing thickness down to 70 nm due to charge transport limitation. The choice of layer thickness in organic photovoltaic devices is critical for optimization of the efficiency. The interdiffusion process is also monitored in situ and a permanent increase in photocurrents is observed during the heat treatment. Transmission electron microscopy (TEM) studies on cross sections of the film reveal that C60 interdiffuses into the MEH-PPV bulk in the form of >10 nm clusters. This clustering of C60 is a result of its tendency to crystallize and the low miscibility of C60 in MEH-PPV, leading to strong phase separation.
To improve the interdiffusion process, the donor polymer is replaced by poly(3-octylthiophene-2,5-diyl) (P3OT), which has a better miscibility with C60. Again, the photocurrents of the interdiffused devices are improved significantly. A monochromatic power conversion efficiency of 1.5 % is obtained for illumination of 3.8 mW/cm2 at 470 nm. The polymer concentration in unheated and interdiffused films is studied with Auger spectroscopy in combination with ion beam milling. The concentration profile shows a distinct interface between P3OT and C60 in unheated films and a slow rise of the P3OT concentration throughout a large cross-section of the interdiffused film. TEM studies on P3OT/C60 films show that C60 still has some tendency to form clusters.
The results of this thesis demonstrate that thermally-controlled interdiffusion is a viable approach for fabrication of efficient photovoltaic devices through nanoscale control of composition and morphology. These results are also used to draw conclusions about the influence of film morphology on the photovoltaic device efficiency and to identify important issues related to materials choice for the interdiffusion process. Prospective variations in materials choice are suggested to achieve better film morphologies.Ph. D.
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Waller, William Michael. "Optimisation of AlGaN/GaN power devices : interface analysis, fieldplate control and current collapse." Thesis, University of Bristol, 2018. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.743050.
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Townsend, Thomas James. "Vivado Design Interface: Enabling CAD-Tool Design for Next Generation Xilinx FPGA Devices." BYU ScholarsArchive, 2017. https://scholarsarchive.byu.edu/etd/6492.
Повний текст джерелаАнотація:
The popularity of field-programmable gate arrays (FPGA) has grown in recent years due to their potential performance advantages over sequential software, and as a prototyping platform for application-specific integrated circuits (ASIC). Vendors such as Xilinx offer automated tool suites that can be used to program FPGAs based on a RTL description. These tool suites are sufficient forgeneral users, but they usually don't provide the opportunity to integrate custom computer-aideddesign (CAD) tools into the regular design flow. Xilinx first offered this capability in their ISE tool suite with the Xilinx Design Language (XDL). Using XDL, a Xilinx design could be extracted from the regular CAD flow, run through an external tool, and injected back into the flow. Research tools targeting commercial FPGAs have most commonly been based on XDL. Vivado (Xilinx's newest tool suite) no longer supports XDL, preventing similar tools from being created for next-generation devices. Instead, Vivado includes a Tcl interface that exposes Xilinx's internal design and device data structures. Considerable challenges still remain to users attempting to leverage this Tcl interface to develop external CAD tools. This thesis presents the Vivado Design Interface (VDI), a set of file formats and Tcl functions that address the challenges of exporting and importing designs to and from Vivado. To demonstrate its use, VDI has been integrated with RapidSmith2, an external FPGA CAD framework. To the best of our knowledge this work is the first successful attempt to provide an opensource tool-flow that can export designs from Vivado, manipulate them with external CAD tools, and re-import an equivalent representation back into Vivado.
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Kiel-Chisholm, Scott. "Civil liability challenges for the law and neural interface devices: Reconceptualising the law." Thesis, The University of Queensland, 2018. https://eprints.qut.edu.au/135189/1/PhD%20Thesis%20-%20Scott%20Kiel-Chisholm.pdf.
Повний текст джерелаАнотація:
Neural interface devices are artificial devices that are controlled by the human mind. Neural interface systems encompass sophisticated technology that enables integration of machine with the human brain and body. The complexity of the brain and neural system is so great that full understanding of how these work is still being discovered through neuroscientific research. Interfacing with the human brain and neural system is far from perfect so the ways in which they work and the limitations of neural interface devices must be recognised when a dispute comes before a court of law.
The research hypothesis tested in this thesis is that when a person who has a neural interface device is involved in circumstances where harm to another person or another person's property occurs, the Australian law will require re evaluation and adaptation to resolve subsequent civil action. Complexity will arise because of the existence of the neural interface device and what might be regarded as a merging of mind and machine. This will make it difficult to determine factual causation and as a result, the law will need to adapt to these circumstances. Thomas Kuhn's concept of revolutionary science, involving paradigm shift, is applied to determine this hypothesis.
While doctrinal methodology is applied in the analysis of the law, policy considerations that will impact on the judicial decision making and legislative action are also discussed. Delphi Method research has been undertaken to obtain the insight of legal experts regarding the legal issues that will arise in the context of civil disputes and how the current law will address these issues. The information upon which the participants in the Delphi Method research based their responses purposely excluded malfunction of the neural interface device as the law will have most difficulty determining liability when the device does not malfunction.
In the analysis of the legal issues, scenarios have been introduced to better assess the application of the law and identify the difficulties that will require re-evaluation and adaptation of the law. While the facts that arise in disputes differ, identification of the difficulties the current law will have in resolving a dispute presented in this thesis will provide insight for future civil proceedings where the person with a neural interface device is involved. Throughout this thesis, the person with the neural interface device is regarded as a defendant in a civil proceeding. The issues involving neural interface devices are multifactorial, so while neuroscientist and engineers develop neural interface devices, lawyers, academics and politicians must consider the ethical, legal and social frameworks within which innovation can exist and thrive. This thesis concludes with recommendations, based on the legal issues identified and analysed, to assist the judiciary, the legislature and the legal profession with this new area of technological advancement.
The challenges that the melding of mind and machine through neural interface present at law are analysed throughout this thesis. This thesis seeks to provide a substantial contribution to the legal literature that is both innovative and pioneering. This new, developing field of inquiry provides the opportunity for ground breaking advances in legal analysis of the existing legal frameworks that, in particular circumstances, will require re-evaluation and adaptation.
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Gargiulo, Gaetano <1977>. "Portable bio-signals devices for brain computer interface and long-term patient monitoring." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/3011/1/Gaetano_Gargiulo_tesi.pdf.
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Gargiulo, Gaetano <1977>. "Portable bio-signals devices for brain computer interface and long-term patient monitoring." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/3011/.
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Ljungström, Andreas, and Jack Panikian. "Implementation and Evaluation of Bluetooth Low Energy for Musical Devices." Thesis, KTH, Data- och elektroteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-188535.
Повний текст джерелаАнотація:
This paper presents the possibility to transfer Musical Instrument Digital Interface messages overBluetooth Low Energy. The main problem was to transmit the messages between two computers inless than 10 milliseconds. Anything above 10 milliseconds could be noticed as a delay by the personplaying or listening to the music. A prototype was written which could transfer Musical InstrumentDigital Interface messages over Bluetooth Low Energy between two Linux-computers together with atesting framework which was used to make measurements. The prototype was written in the languageC++ with the BlueZ library. The time it took for one packet to travel back and forth from the computerswas clocked to get an estimation of the time it took for a packet to travel from one computer to theother. The measured results showed that it was possible to reach the desired time of 10 milliseconds.The results can also be used when considering development of other kind of equipment and/or applicationsthat implements the use of Bluetooth Low Energy.Denna rapport presenterar möjligheterna att överföra Musical Instrument Digital Interfacemeddelanden över Bluetooth Low Energy. Huvudproblemet var att överföra meddelandena mellantvå datorer under en tid av 10 millisekunder. Allt över 10 milliskunder skulle kunna uppfattas somen fördröjning av den som spelade eller lystnade på musiken. En prototyp skapades som kundeöverföra denna typ meddelanden över Bluetooth Low Energy mellan två Linux-datorer tillsammansmed ett test-ramverk som kunde utföra prestandamätningar. Prototypen skrevs i språket C++tillsammans med biblioteket BlueZ. Den tid det tog för ett paket att färdas fram och tillbaka mellande båda datorerna klockades för att få en uppskattning på hur lång tid det tog för ett paket att färdasfrån en dator till en annan. De uppmätta resultaten visar att det är möjligt att uppnå deneftersträvade tiden på 10 millisekunder. Resultatet kan också användas då det övervägs att utvecklaett annat typ av program eller applikation som ska nyttja Bluetooth Low Energy.
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Richards, Mark Andrew. "An intuitive motion-based input model for mobile devices." Thesis, Queensland University of Technology, 2006. https://eprints.qut.edu.au/16556/1/Mark_Richards_Thesis.pdf.
Повний текст джерелаАнотація:
Traditional methods of input on mobile devices are cumbersome and difficult to use. Devices have become smaller, while their operating systems have become more complex, to the extent that they are approaching the level of functionality found on desktop computer operating systems. The buttons and toggle-sticks currently employed by mobile devices are a relatively poor replacement for the keyboard and mouse style user interfaces used on their desktop computer counterparts. For example, when looking at a screen image on a device, we should be able to move the device to the left to indicate we wish the image to be panned in the same direction.
This research investigates a new input model based on the natural hand motions and reactions of users. The model developed by this work uses the generic embedded video cameras available on almost all current-generation mobile devices to determine how the device is being moved and maps this movement to an appropriate action.
Surveys using mobile devices were undertaken to determine both the appropriateness and efficacy of such a model as well as to collect the foundational data with which to build the model. Direct mappings between motions and inputs were achieved by analysing users' motions and reactions in response to different tasks.
Upon the framework being completed, a proof of concept was created upon the Windows Mobile Platform. This proof of concept leverages both DirectShow and Direct3D to track objects in the video stream, maps these objects to a three-dimensional plane, and determines device movements from this data.
This input model holds the promise of being a simpler and more intuitive method for users to interact with their mobile devices, and has the added advantage that no hardware additions or modifications are required the existing mobile devices.
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Kratz, Sven [Verfasser], and Michael [Akademischer Betreuer] Rohs. "Sensor-based user interface concepts for continuous, around-device and gestural interaction on mobile devices / Sven Kratz. Betreuer: Michael Rohs." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2012. http://d-nb.info/1031379932/34.
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Jackson, Tyler Andrew. "Gas gun studies of armature-rail interface wear effects." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37223.
Повний текст джерелаАнотація:
The objective of this work has been to investigate the applicability of the gas gun to study the armature-rail interface wear characteristics relevant to rail gun operations. The approach involved developing constitutive models for armature materials (aluminum 6061) as well as oxygen-free high-thermal conductivity copper as the rail material. Taylor rod-on-anvil impact experiments were performed to validate the accuracy of constitutive strength models by correlating predictions of dynamic simulations in ANSYS AUTODYN with experimental observations. An optical comparator was used to discretize the cross sectional deformation profile of each rod-shaped sample. Parameters of the Johnson-Cook strength model were adjusted for each material to match deformation profiles obtained from simulations with profiles obtained from impact experiments. The fitted Johnson-Cook model parameters for each material were able to give overall deformed length and diameter values within 2% of the experimentally observed data. Additional simulations were then used with the validated strength model parameters to design the geometry involving cylindrical rods of armature material accelerated through a concentric cylindrical extrusion die made of copper, to emulate the interface wear effects produced in a rail gun operation. Experiments were conducted using this geometry and employing both the 7.62mm and 80mm diameter gas guns. Microstructural analysis was conducted on interfaces of the recovered samples from both designs. Hardness measurements were also performed along the interface layer to evaluate the structure formation due to solid-state wear or melt formation. The stress and strain conditions resulting in the observed microstructural effects were correlated with predictions from numerical simulations performed using the validated material models. The overall results illustrate that the stress-strain conditions produced during acceleration of Al through hollow concentric copper extrusion die, result in interface deformation and wear characteristics that are influenced by velocity. At velocities (less than 800m/s), interface wear leads to formation of layer dominated by solid-state alloying of Cu and Al, while higher velocities produce a melted and re-solidified aluminum layer. Hence, use of different armature (Al-based) and rail (Cu-based) materials can be evaluated with the gas-gun set-up employed in the current work to study the effects of interface wear ranging from formation melt layer to solid-state alloying as a function of material properties and velocity.
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Bégon-Lours, Laura. "Ferroelectric field-effects in high-tc superconducting devices." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066007/document.
Повний текст джерелаАнотація:
Les supraconducteurs à haute température critique (HTS) sont des systèmes fortement corrélés. Dans ces matériaux, une petite modification du nombre de porteurs peut avoir de grandes conséquences sur leurs propriétés physiques. C'est le cas lorsqu'un matériau ferroélectrique est à proximité immédiate d'un HTS : de manière locale et rémanente, la polarisation ferroélectrique modifie par effet de champ électrostatique le nombre d'électrons dans le HTS, au voisinage de l'interface avec le ferroélectrique. Cet effet peut être exploité dans le but de définir des structures à géométrie variable : dans un premier cas, des jonctions qui consistent en deux électrodes supraconductrices, séparées par une zone où la supraconductivité a été affaiblie par effet de champ. Dans un second cas, des jonctions tunnel ferroélectriques - à nouveau avec des électrodes supraconductrices - où l'épaisseur de la barrière est modulable par effet de champ ferroélectrique. Les travaux menés au cours de cette thèse visent à développer les matériaux et les technologies de lithographie pour fabriquer de telles structures, et à caractériser les propriétés de transport de ces dernièresIn this experimental thesis, we fabricated ferroelectric field-effect devices based on high-Tc superconductors. We grew high-quality epitaxial heterostructures consisting of an ultra-thin (2 to 6 unit cells) film of YBCO and a thin ferroelectric film (BFO-Mn). We fabricated transport measurement microbridges and used a CT-AFM tip to polarise the BFO-Mn outwards or towards the BFO-Mn/YBCO interface. Due to the ferroelectric field-effect, the superconducting properties of the underlying YBCO film were consequently modified. We then used this effect locally in order to design weak links within the microbridges: two regions where the superconducting properties are enhanced are separated by a narrow region where they are depressed. We explored the conditions of existence of a Josephson coupling across this weak link. In parallel, we fabricated ferroelectric junctions. The barrier is an ultra-thin BFO-Mn film sandwiched between a high-Tc superconducting YBCO bottom electrode and a low-Tc superconducting top electrode. Both at room temperature and at low temperature, we characterised the transport properties across the barrier and the resistive switching resulting from the polarisation of the ferroelectric barrier
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Wang, Lei. "Modeling of the armature-rail interface in an electromagnetic launcher with lubricant injection." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26519.
Повний текст джерелаАнотація:
Thesis (Ph.D)--Mechanical Engineering, Georgia Institute of Technology, 2009.Committee Chair: Salant, Richard F.; Committee Member: Bair, Scott; Committee Member: Cowan, Richard S; Committee Member: Danyluk, Steven; Committee Member: Scott, Waymond R. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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Kulkarni, Dhaval Deepak. "Interface properties of carbon nanostructures and nanocomposite materials." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/49092.
Повний текст джерелаАнотація:
Two different interfaces were the focus of study: 1) the interface between disordered amorphous carbon and inorganic materials (metal nanostructures and silicon), and 2) the interface between partially ordered graphene (graphene oxide) and synthetic polymer matrix. Specifically, the uniqueness of this study can be summarized through the following novel findings, fabrication processes, and characterization techniques:
• A simple and efficient process for faster, greener, less-expensive, and highly localized transformation of amorphous carbon nanostructures into graphitic nanostructures using low temperature heat and light treatments was developed for the fabrication of low-resistance interfaces between carbon nanomaterials and inorganic metal surfaces.
• A new protocol for high resolution mapping the charge distribution and electronic properties of nanoscale chemically heterogeneous domains on non-homogeneous surfaces such as graphene oxide was established.
• High strength laminated mechanical nanocomposites based on high interfacial stress transfer between polymer matrices and large area, flat, and non-wrinkled graphene oxide sheets were suggested and demonstrated.
• Scanning Thermal Twist Microscopy – a thermal microscopy based technique was developed and demonstrated for characterizing the thermal properties of homogeneous and heterogeneous interfaces with nanoscale spatial resolution and high thermal sensitivity unachievable using traditional techniques.
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Tewksbury, Theodore L. (Theodore Locke). "Relaxation effects in MOS devices due to tunnel exchange with near-interface oxide traps." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/13238.
Повний текст джерелаАнотація:
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1992.Includes bibliographical references (p. 299-317).
by Theodore L. Tewksbury III.
Ph.D.
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Wang, Jue. "System Design, Fabrication, and Characterization of Thermoelectric and Thermal Interface Materials for Thermoelectric Devices." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/83546.
Повний текст джерелаАнотація:
Thermoelectric devices are useful for a variety of applications due to their ability to either convert heat directly into electricity, or to generate a temperature gradient from an electric current. These devices offer several attractive features including compact size, no moving parts, limited maintenance requirements, and high reliability. Thus thermoelectric devices are used for temperature-control, cooling, or power generation in various industrial systems such as automobiles, avionics, refrigerators, chillers, laser diodes, dehumidifiers, and a variety of sensors. In order to improve the efficiency of thermoelectric devices, many endeavors have been made to design and fabricate materials with a higher dimensionless thermoelectric figure of merit (ZT), as well as to optimize the device structure and packaging to manage heat more effectively. When evaluating candidate thermoelectric materials, one must accurately characterize the electrical conductivity, thermal conductivity, and the Seebeck coefficient over the temperature range of potential use. However, despite considerable research on thermoelectric materials for decades, there is still significant scatter and disagreement in the literature regarding accurate characterization of these properties due to inherent difficulties in the measurements such as requirements for precise control of temperature, simultaneous evaluation of voltage and temperature, etc. Thus, a well-designed and well-calibrated thermoelectric measurement system that can meet the requirements needed for multiple kinds of thermoelectric materials is an essential tool for the development of advanced thermoelectric devices.
In this dissertation, I discuss the design, fabrication, and validation of a measurement system that can rapidly and accurately evaluate the Seebeck coefficient and electrical resistivity of thermoelectric materials of various shapes and sizes from room temperature up to 600 K. The methodology for the Seebeck coefficient and electrical resistivity measurements is examined along with the optimization and application of both in the measurement system. The calibration process is completed by a standard thermoelectric material and several other materials, which demonstrates the accuracy and reliability of the system.
While a great deal of prior research has focused on low temperature thermoelectric materials for cooling, such as Bi2Te3, high temperature thermoelectric materials are receiving increasing attention for power generation. With the addition of commercial systems for the Seebeck coefficient, electrical resistivity, and thermal conductivity measurements to expand the temperature range for evaluation, a wide range of materials can be studied and characterized. Chapter Two of this dissertation describes the physical properties characterization of a variety of thermoelectric materials, including room temperature materials such as Bi0.5Sb1.5Te3, medium temperature level materials such as skutterudites, and materials for high temperature applications such as half-Heusler alloys. In addition, I discuss the characterization of unique oxide thermoelectric materials, which are Al doped ZnO and Ca-Co-O systems for high temperature applications.
Chapter Four of this dissertation addresses the use of GaSn alloys as a thermal interface material (TIM), to improve thermal transport between thermoelectric devices and heat sinks for power generation applications at high temperature. I discuss the mechanical and thermal behavior of GaSn as an interface material between electrically insulating AlN and Inconel heat exchangers at temperatures up to 600 °C. Additionally, a theoretical model for the experimental thermal performances of the GaSn interface layer is also examined.Ph. D.
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Wei, Ran. "A VIBRATIONAL ENERGY HARVESTING SYSTEM WITH RESONANT PIEZOELECTRIC DEVICES AND LOW-POWER ELECTRONIC INTERFACE." Case Western Reserve University School of Graduate Studies / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=case1396628545.
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Argüello, Ron Diego. "Development of an Intelligent Embedded Interface for Interpreting Biosignals Recorded by Novel Wearable Devices." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-264992.
Повний текст джерелаАнотація:
In recent years there has been a considerable development in the realm of sensing technologies, embedded systems, wireless communication technologies, nanotechnologies, and miniaturization has made it possible to create smart wearable systems that can record data from the human bodies and monitor our daily activities. Most expectations for the successful deployment of wearable devices and their tangible impact for the society is in healthcare. Nevertheless, its use has been limited by the absence of intelligent mobile device interfaces able to process, analyse and inference the recorded data, giving relevant information to the user. On the other hand, new advances in nanotechnology have allowed the creation of so-called electronic skin, which consists in thin and flexible electrodes, easy and comfortable to use. This allows building new wearable devices able to record electrical activity from the surface of the body, which has a large diagnostic and monitoring potential. In this work, the goal is to study the feasibility of using these new sensors for continuous biopotential recording while supporting them with a mobile phone application able to receive, process and analyse the recorded biosignals in order to deliver useful feedback to the user in real-time. The wearable device known as Senso Medical Bio Pot V2 is proposed as a possible candidate to carry out electromyography (EMG), electrocardiography (ECG) and electroencephalography (EEG) recordings via skin tattoo electrodes. Moreover, an Android Application that connects to this device is created. It uses Machine Learning Algorithms embedded on it in order to classify the received signals. Finally, Long-Short Term Memory (LSTM) networks are implemented for classifying EEG and EMG signals. Several conclusions are derived from this work. Firstly, the device Senso Medical Bio Pot V2 is not suitable for its use as a wearable device for biosignal recording. Secondly, the Application designed and simulated offline achieves good performance. As a consequence, it could be used in the future with a suitable wearable sensor and offer good potential for processing and interpreting recorded biosignals with an opportunity to provide real-time feedback to the user in Brain-Computer Interface (BCI) type of applications.Under de senaste åren har det varit en betydande utveckling inom kännetecknande teknik, inbyggda system, trådlös kommunikationsteknik, nanoteknik och miniatyrisering gjort det möjligt att skapa smarta bärbara system som kan spela in data från människokroppen och övervaka våra dagliga aktiviteter. Bärbar teknik är viktig på grund av dess inverkan på sjukvård. Ändå har användningen begränsats av avsaknaden av intelligenta gränssnitt för mobila enheter som kan bearbeta, analysera och avleda de inspelade data, vilket ger användaren viktig information. Å andra sidan har nya framsteg inom nanotekniken gjort det möjligt att skapa så kallad elektronisk hud, som består av tunna och flexibla elektroder, lätt och bekväm att använda. Detta gör det möjligt att bygga nya bärbara enheter som kan registrera elektrisk aktivitet från kroppens yta, vilket har en stor diagnostisk och övervaknings potential. I detta arbete är målet att studera möjligheten att använda dessa nya sensorer för kontinuerlig biopotentiell inspelning samtidigt som de stöder dem med en mobilapplikation som kan ta emot, bearbeta och analysera de inspelade biosignalerna för att ge användbar feedback till användaren i realtid. Den bärbara enheten Senso Medical Bio Pot V2 föreslås som en möjlig kandidat för att genomföra elektromyografi (EMG), elektrokardiografi (EKG) och elektroencefalografi (EEG) inspelningar via elektroniska tatueringar. Dessutom skapas en Android-applikation som ansluter till den här enheten. Den använder maskinlärningsalgoritmer inbäddade på den för att klassificera mottagna signaler. Slutligen implementeras Långt Korttidsminne Nätverk för att klassificera EEG och EMG signaler. Flera slutsatser härrör från detta arbete. För det första är enheten Senso Medical Bio Pot V2 inte lämplig för användningen som en bärbar anordning för biosignalinspelning. För det andra åstadkommer applikationen designad och simulerad offline, god prestanda. Till följd av detta kan den användas i framtiden med en lämplig bärbar sensor och erbjuda god potential för bearbetning och tolkning av inspelade biosignaler med möjlighet att ge realtid återkoppling till användaren i hjärndatorgränssnittet typ av applikationer.
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Borrachero, Conejo Ana Isabel <1989>. "Brain glial interface: Advance materials and devices targeting molecular and functional study of astrocytes." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amsdottorato.unibo.it/9009/1/BorracheroConejo_AnaIsabel_Tesi.pdf.
Повний текст джерелаАнотація:
Astrocytes are fundamental for the physiology of the central nervous system. Indeed, astrocytes dysfunction has been observed in many brain pathologies making them an attractive target for innovative therapeutical approaches. Proteins mediating calcium signaling are critically implicated in astrocytic function and dysfunction. However, state-of-the-art tools to study and modulate astroglial functions faced limited spatio-temporal sensitivity, cell selectivity and low throughput. While the use of materials and devices enabling photo- and electrical stimulation, have been shown to modulate neuronal activity, their potential to selectively alter astroglial behaviour have largely been neglected. To address this challenging issue, we use materials and devices to modulate and study astrocytes physiology in vitro.
We present a device based on N, N’-ditridecylperylene-3,4,9,10-tetracarboxylic diimide (P13), that enables electrical stimulation of astrocytes by evoking increases in intracellular calcium concentrations in primary astrocytes. Pharmacological evidences show that the channels TRPV4 and TRPA1 are critically implicated in the observed effect. Moreover, we show that electrical stimulation promotes also cell swelling.
We also explore the potential of graphene-based materials as neural interface by using graphene oxide functionalized with a phospholipid (GO-PL). We demonstrate that GO-PL allows an enhanced adhesion of astrocytes without promoting gliosis, that is not caused by modification of physicochemical properties.
Finally, we investigate the effect of infrared neural stimulation (INS) on Ca2+-signaling in vitro and in a validated cell culture model of differentiated astrocytes demonstrating that INS represents a new label-free method to modulate astroglial Ca2+-signaling in vitro. Pharmacology and siRNA experiments, show that INS evoke extracellular Ca2+ influx, mediated by TRPV4 and TRPA1 channels, and Ca2+ release from intracellular stores. Notably, experiments on astrocytes from AQP4-KO-/- showed a delayed response.
Collectively, we show the impact of novel technologies for understanding the mechanisms behind astrocytes function as well as the use of this technologies to target astrocyte functioning.
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Astistova, T. I., and O. B. Typa. "Chatbot development for Telegram social network." Thesis, Київський національний університет технологій та дизайну, 2021. https://er.knutd.edu.ua/handle/123456789/19330.
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Judge, Elizabeth Eileen. "Direct measurement of dissipative forces in superconducting BSCCO." Access restricted to users with UT Austin EID Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3035957.
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Toure, Zikra. "Human-Machine Interface Using Facial Gesture Recognition." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc1062841/.
Повний текст джерелаАнотація:
This Master thesis proposes a human-computer interface for individual with limited hand movements that incorporate the use of facial gesture as a means of communication. The system recognizes faces and extracts facial gestures to map them into Morse code that would be translated in English in real time. The system is implemented on a MACBOOK computer using Python software, OpenCV library, and Dlib library. The system is tested by 6 students. Five of the testers were not familiar with Morse code. They performed the experiments in an average of 90 seconds. One of the tester was familiar with Morse code and performed the experiment in 53 seconds. It is concluded that errors occurred due to variations in features of the testers, lighting conditions, and unfamiliarity with the system. Implementing an auto correction and auto prediction system will decrease typing time considerably and make the system more robust.