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Richards, Adam Stephens. "The effect of imagined interactions on secret revelation and health." Diss., [Missoula, Mont.] : The University of Montana, 2009. http://etd.lib.umt.edu/theses/available/etd-06032009-135857.
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Coduto, Kathryn D. "Understanding Receiver Effects of the Hyperpersonal Model Using the Imagined Interactions Framework." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1587728475851046.
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Covington, Emily N. "Enhancing Constructive Political Conflict Using Positive Imagined Interactions| A Qualitative Test of the Seventh Theorem of Conflict Linkage Theory." Thesis, University of Louisiana at Lafayette, 2019. http://pqdtopen.proquest.com/#viewpdf?dispub=10980987.
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This narrative inquiry sought to determine whether the strategic use of positive imagined interactions (IIs), or the conversations one has in their mind, could enhance cross-cutting political conflict while also testing the seventh theorem of II conflict linkage theory which states, “In order to enhance constructive conflict, individuals need to imagine positive interactions and outcomes” (Honeycutt, 2003a, p. 6). Undergraduate student participants were assigned to one of three conditions (positive II, negative II, or control) and engaged in a three-phase procedure. Phase one, pre-interaction, prompted the participants to engage in an II, and then reflect on their IIs by answering open-ended questions. During phase two, interaction, participants engaged in an actual, cross-cutting conversation about the political topic of their choice with a trained confederate. During the final stage, post-interaction, participants completed a second questionnaire to assess the constructiveness or destructiveness of their interaction. A thematic analysis revealed that 40 out of 45 total participants, regardless of their pre-assigned condition, engaged in a positive, constructive conflict with their conversation partner. The results also indicate that positive IIs aid in perspective-taking while negative IIs satisfy individuals by allowing them to mentally defend their beliefs. While the results neither confirm nor disprove Theorem 7 of II conflict linkage theory, they do support Theorem 3 which explains that negative intrusive IIs often occur when a person purposely attempts to have a positive II.
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Marske, Sarah Lindley. "Plaza Fiesta: A Re-Imagined Homeland Contributing to Latino Identity and Community." Digital Archive @ GSU, 2008. http://digitalarchive.gsu.edu/communication_theses/39.
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This study analyzes the relationship between Plaza Fiesta, a Latino shopping center located in Atlanta, Georgia, and concepts of Latino identity and community formation among immigrants in a U.S. city. It is focused specifically on the complexities of identification for Latin American immigrants, who relate in various ways to Plaza Fiesta. One chapter explores the relationships between product consumption, marketing, spaces, and memory in the production of hybrid identity formations. Another chapter considers the relationship between pan-ethnic Latino identity construction and notions of belonging and not belonging for these Latin American immigrants. The final chapter adds to knowledge about identity by analyzing the complexities and contradictions based on interviews, questionnaires, and observations at Plaza Fiesta. Moreover, this paper examines the importance these topics have with immigration issues and U.S. society. Overall, this paper suggests that Plaza Fiesta plays a role in establishing a sense of Latino community in Atlanta.
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Simmons, Arlecia Deandra. ""Serving sinners, comforting saints and increasing faith": the Reverend Edythe Stirlen's imagined radio church community." Diss., University of Iowa, 2009. https://ir.uiowa.edu/etd/435.
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In the early 1920s, commercial radio presented many possibilities, including the nationalization of the listening audience, professional opportunities for women, the ability for ministers to spread the gospel, and access to the world for geographically isolated listeners. The media ministry of the Rev. Edythe Elem Swartz Stirlen operated outside the confines of a brick-and-mortar church and created an imagined religious community of congregants. Through the Shenandoah, Iowa, based Radio Church of the Air program, the Send Out Sunshine magazine, and the Send Out Sunshine Clubs, Stirlen and her virtual parishioners created images of communion they interpreted and used to maintain their community. This project examines the cultural work and the community building function of early American radio.
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McConnell, Kristen. "Let's go to the Park: Allegheny County Parks Re-imagined through Service Design." Research Showcase @ CMU, 2013. http://repository.cmu.edu/theses/47.
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Abstract. This thesis project analyzes how the principles and methods of service design, design thinking, and human-centered design research can be utilized to re-imagine a county-level parks department, specifically Allegheny County Parks. Allegheny County Parks is a system of nine parks that have suffered for 30+ years from deferred maintenance, funding cuts, and other shortages. Boyce Park, one of the nine County parks, includes a broad range of prototypical park activities. My previous employment and established relationships made Boyce Park an excellent service design case study. To begin the project, I employed exploratory research methods (e.g., literature reviews, observations, participation in services, surveys, and interviews) to understand the design space. Then, generative research methods (e.g., affinity diagrams, personas, stakeholder maps, and service blueprints) led to the identification of key service improvement areas: organizational structure, increase revenue, infrastructure, user-centered park policies and communications. The area of communications was chosen for further exploration, due to its potential as a first step in transforming the parks and affecting the other service improvement areas. Another round of communications-centered exploratory and generative research (e.g., benchmarking and speed dating) was completed, resulting in a new service ecology and communications system proposal for Allegheny County Parks. A portion of the new communications system, specifically a responsive website design for mobile, tablet and desktop platforms, was prototyped. The responsive design, which showcased an activity finder and reservation system, was evaluated through paper prototyping sessions. The feedback from these sessions was implemented within a final HTML prototype.
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Wu, Lu. "Tell It if You Can: A Study of Post-Traumatic Stress Disorder in Newspapers and Military Blogs." Ohio University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1366731661.
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Sheng, Yingyan. "Communication Between Left-Behind Children and Their Migrant Parents in China: A Study of Imagined Interactions, Relational Maintenance Behaviors, Family Support, and Relationship Quality." Kent State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=kent1574615755025795.
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Makeschin, Sarah [Verfasser], Karsten [Akademischer Betreuer] Fitz, and Volker [Akademischer Betreuer] Depkat. "“The Imagined Presidency”: Political Communication as “Narrative” and “Performance” – A Case Study of Barack Obama’s 2008 Presidential Campaign / Sarah Makeschin ; Karsten Fitz, Volker Depkat." Passau : Universität Passau, 2017. http://d-nb.info/1124229671/34.
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Thompson, Andrea. "Sexual tension : the imagined learner projected through the recontextualising of sexual knowledge into pedagogic communication in two curricula in South Africa and Ontario, Canada." Master's thesis, University of Cape Town, 2014. http://hdl.handle.net/11427/13027.
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Includes bibliographical references.This study conducts a textual analysis of the structure and discourses present in two sets of sex education curriculum documents - one from South Africa and one from Ontario, Canada. It did so to make visible the imagined learner projected by these curricula in the recontextualising of sexual knowledge into pedagogic communication. Using a deductive framework built on Basil Bernstein’s concepts of classification, framing, vertical and horizontal discourse and instructional and regulative discourse to recognise the structure, and an inductive coding process complemented by Louisa Allen’s discourse of erotics to recognise the discourses and strategic silences present and absent, it concludes that the imagined learner would have a sex negative, context independent orientation to meaning, be heterosexual and not yet be sexually active. The study problematises this learner, presenting statistical evidence that the vertical discourse of the school is significantly disconnected from the horizontal discourse of the everyday. The research raises questions about the role of recontextualising in reproducing a sex negative hegemonic discourse of adolescent sexuality and, through a unique coding scheme, provides a framework for recognising the relative implicitness and explicitness of regulative discourses and their respective relations to power and control over sexual knowledge.
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Bi, Chang. "How Do Credibility of For-profit and Non-profit Source and Sharer, Emotion Valence, Message Elaboration, and Issue Controversiality Influence Message Sharing to Imagined Audience on Facebook?" Bowling Green State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1562106043868372.
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FEARING, CHRISTOPHER JAMES. "IMAGING SENSORS WITH DATA COMMUNICATIONS CAPABILITIES." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1141352420.
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O'Such, William R. "Information theoretic analysis of multi-stage communication/imaging systems /." Online version of thesis, 1988. http://hdl.handle.net/1850/10568.
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Lashley, Brandon Christopher. "Communicating Community at Tesla Motors: Maintaining Corporate Values in Blogging Communities." Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/78222.
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Knowing how organizations engage employees can help researchers and practitioners better understand how to effectively communicate and engage employees to create an efficient and collaborative work environment. This research sought to discover if Tesla Motors strategically communicated values from its Master Plan through company blogs to create an imagined community. The theory of imagined communities provided the theoretical foundation. This research used a content analysis of words and phrases within Tesla's Master Plan and 2015 corporate blog. Although the blog provided some indication that it was communicating values, this study concluded that the Master Plan did not provide enough value information to support a strategic imagined community. This study does, however, imply that imagined communities can be used in public relations research.Master of Arts
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Hajjarian, Kashany Zeinab Kavehrad Mohsen. "Mimo optical communications and imaging through turbulent cloudy atmosphere." [University Park, Pa.] : Pennsylvania State University, 2009. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-4524/index.html.
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Britton, Thomas George 1950. "Picture archiving and communication system model and simulation using Network II5." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/276656.
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This paper describes the application of Network II.5, a modelling tool, to the development of a model for a Picture Archiving and Communication System (PACS). The model is used to evaluate the performance of a PACS through computer simulation. The work includes interpretation of the ACR-NEMA Standard for Digital Imaging and Communications. This standard adheres to the ISO-OSI reference model which separates the functions of device communication into well-defined layers. In this work, the Application/Presentation, Session, and Transport layers are treated in detail, in fact, the model structure is based on these layers. Results and conclusions show that Network II.5 is useful in this application, however some weaknesses were exposed due to the size and complexity of the final system model.
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Schuerger, Jonathan Paul. "Ultra-Wideband OFDM Radar and Communication System." Miami University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=miami1240346718.
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Newman, Ganer L. IV. ""Now Imagine You're One of Them": Using Serious Games to Induce Identification with Out-Groups." TopSCHOLAR®, 2012. http://digitalcommons.wku.edu/theses/1224.
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The purpose of this study was to expand our understanding of the utility of identification in the reduction of out-group derogation. Specifically, this research examined the extent to which individuals can be persuaded to identify with members of a perceived out-group, particularly through the use of online games. Spent is an online, point-and-click game that places users in the role of the working poor. Spent was used to test the potential of serious or prosocial games to increase players’ identification with a group of people who are often on the fringes of social acceptance. Specifically, this research (a) developed a new measurement of cause identification, the Identification with Perceived Out-Group Scale (IPOGS), (b) tested the validity and reliability of the IPOGS, and (c) examined the change in identification with America’s poor after playing the online game Spent.
Following a pilot test of the Identification with Perceived Out-Group Scale, 55 young adults (ages 18-35) were recruited to participate in a quasi-experiment. Initially, participants completed the IPOGS and then played the online game Spent. Upon completion of the game, participants took the IPOGS again. Participants were also asked questions about their game play experience and basic demographic information.
Results indicate that individuals who had lower levels of identification with America's poor had significantly higher levels of identification after playing the online game. The increase in identification was evidenced in a greater perception of common interests and values, greater affective attachment, and greater willingness to interact with the working poor after playing Spent. These findings suggest that nonprofit organizations may find online gaming beneficial when trying to cultivate identification with their causes, particularly among young adults.
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Griffiths, Alexander D. "Novel optical communications and imaging enabled by CMOS interfaced LED technology." Thesis, University of Strathclyde, 2018. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=30328.
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Arrays of micron sized light-emitting diodes (micro-LEDs) allow high-frequency spatial and temporal modulation of an optical signal. Contacting micro-LED arrays to complementary metal-oxide-semiconductor (CMOS) electronics provides a mm-chip-scale device with a high level of control over the optical emission through digital input. Such devices enable novel forms of optical communication and imaging to be investigated. This thesis first demonstrates the use of CMOS controlled micro-LEDs in multi-level intensity modulated optical communications. By generating signals in a discrete fashion with weighted groups of pixels in an array, the non-linearity issues of single LED elements can be avoided and the device functions as a digital-to-light converter. Pulse amplitude modulation and discrete orthogonal frequency division multiplexing were performed, yielding data rates up to 200 Mb/s, and spectral efficiencies up to 3.96 bits/s/Hz. A novel form of optical communications is introduced where data is sent through modulation of the temporal correlation of a pulsed optical signal. Utilising single-photon detection at the receiver enables transmission at low received power levels, on the order of picowatts. While data rates prove to be modest, the scheme is robust to both constant and modulated background signals. Additionally, the implementation requires only simple semiconductor components, exhibits low electrical power consumption, and has been demonstrated under power from a nanosatellite simulation testbed. The pulse correlation approach also presents opportunities in imaging. Received signals are dependent on optical power; therefore, if relative emitted power from multiple transmitters is known, information on the reectance or absorption of an intermediate material can be obtained. This potentially enables colour or hyperspectral imaging with single-photon detectors by temporally structuring light sources. Proof-of-principle experiments have been performed using commercially available LEDs of 10 different wavelengths and printed colour targets.
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Khan, Sajjad. "Liquid Crystal Optics for Communications, Signal Processing and 3-D Microscopic Imaging." Doctoral diss., University of Central Florida, 2005. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3389.
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This dissertation proposes, studies and experimentally demonstrates novel liquid crystal (LC) optics to solve challenging problems in RF and photonic signal processing, freespace and fiber optic communications and microscopic imaging. These include free-space optical scanners for military and optical wireless applications, variable fiber-optic attenuators for optical communications, photonic control techniques for phased array antennas and radar, and 3-D microscopic imaging. At the heart of the applications demonstrated in this thesis are LC devices that are non-pixelated and can be controlled either electrically or optically. Instead of the typical pixel-by-pixel control as is custom in LC devices, the phase profile across the aperture of these novel LC devices is varied through the use of high impedance layers. Due to the presence of the high impedance layer, there forms a voltage gradient across the aperture of such a device which results in a phase gradient across the LC layer which in turn is accumulated by the optical beam traversing through this LC device. The geometry of the electrical contacts that are used to apply the external voltage will define the nature of the phase gradient present across the optical beam. In order to steer a laser beam in one angular dimension, straight line electrical contacts are used to form a one dimensional phase gradient while an annular electrical contact results in a circularly symmetric phase profile across the optical beam making it suitable for focusing the optical beam. The geometry of the electrical contacts alone is not sufficient to form the linear and the quadratic phase profiles that are required to either deflect or focus an optical beam. Clever use of the phase response of a typical nematic liquid crystal (NLC) is made such that the linear response region is used for the angular beam deflection while the high voltage quadratic response region is used for focusing the beam. Employing an NLC deflector, a device that uses the linear angular deflection, laser beam steering is demonstrated in two orthogonal dimensions whereas an NLC lens is used to address the third dimension to complete a three dimensional (3-D) scanner. Such an NLC deflector was then used in a variable optical attenuator (VOA), whereby a laser beam coupled between two identical single mode fibers (SMF) was mis-aligned away from the output fiber causing the intensity of the output coupled light to decrease as a function of the angular deflection. Since the angular deflection is electrically controlled, hence the VOA operation is fairly simple and repeatable. An extension of this VOA for wavelength tunable operation is also shown in this dissertation. A LC spatial light modulator (SLM) that uses a photo-sensitive high impedance electrode whose impedance can be varied by controlling the light intensity incident on it, is used in a control system for a phased array antenna. Phase is controlled on the Write side of the SLM by controlling the intensity of the Write laser beam which then is accessed by the Read beam from the opposite side of this reflective SLM. Thus the phase of the Read beam is varied by controlling the intensity of the Write beam. A variable fiber-optic delay line is demonstrated in the thesis which uses wavelength sensitive and wavelength insensitive optics to get both analog as well as digital delays. It uses a chirped fiber Bragg grating (FBG), and a 1xN optical switch to achieve multiple time delays. The switch can be implemented using the 3-D optical scanner mentioned earlier. A technique is presented for ultra-low loss laser communication that uses a combination of strong and weak thin lens optics. As opposed to conventional laser communication systems, the Gaussian laser beam is prevented from diverging at the receiving station by using a weak thin lens that places the transmitted beam waist mid-way between a symmetrical transmitter-receiver link design thus saving prime optical power. LC device technology forms an excellent basis to realize such a large aperture weak lens. Using a 1-D array of LC deflectors, a broadband optical add-drop filter (OADF) is proposed for dense wavelength division multiplexing (DWDM) applications. By binary control of the drive signal to the individual LC deflectors in the array, any optical channel can be selectively dropped and added. For demonstration purposes, microelectromechanical systems (MEMS) digital micromirrors have been used to implement the OADF. Several key systems issues such as insertion loss, polarization dependent loss, wavelength resolution and response time are analyzed in detail for comparison with the LC deflector approach. A no-moving-parts axial scanning confocal microscope (ASCM) system is designed and demonstrated using a combination of a large diameter LC lens and a classical microscope objective lens. By electrically controlling the 5 mm diameter LC lens, the 633 nm wavelength focal spot is moved continuously over a 48 [micro]m range with measured 3-dB axial resolution of 3.1 [micro]m using a 0.65 numerical aperture (NA) micro-objective lens. The ASCM is successfully used to image an Indium Phosphide twin square optical waveguide sample with a 10.2 [micro]m waveguide pitch and 2.3 [micro]m height and width. Using fine analog electrical control of the LC lens, a super-fine sub-wavelength axial resolution of 270 nm is demonstrated. The proposed ASCM can be useful in various precision three dimensional imaging and profiling applications.Ph.D.
Optics and Photonics
Optics
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Anderson, Christopher R. "A Software Defined Ultra Wideband Transceiver Testbed for Communications, Ranging, or Imaging." Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/29026.
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Impulse Ultra Wideband (UWB) communications is an emerging technology that promises a number of benefits over traditional narrowband or broadband signals: extremely high data rates, extremely robust operation in dense multipath environments, low probability of intercept/detection, and the ability to operate concurrently with existing users. Unfortunately, most currently available UWB systems are based on dedicated hardware, preventing researchers from investigating algorithms or architectures that take advantage of some of the unique properties of UWB signals.
This dissertation outlines the development of a general purpose software radio transceiver testbed for UWB signals. The testbed is an enabling technology that provides a development platform for investigating ultra wideband communication algorithms (e.g., acquisition, synchronization, modulation, multiple access), ranging or radar (e.g., precision position location, intrusion detection, heart and respiration rate monitoring), and could potentially be used in the area of ultra wideband based medical imaging or vital signs monitoring. As research into impulse ultra wideband expands, the need is greater now than ever for a platform that will allow researchers to collect real-world performance data to corroborate theoretical and simulation results.
Additionally, this dissertation outlines the development of the Time-Interleaved Analog to Digital Converter array which served as the core of the testbed, along with a comprehensive theoretical and simulation-based analysis on the effects of Analog to Digital Converter mismatches in a Time-Interleaved Sampling array when the input signal is an ultra wideband Gaussian Monocycle. Included in the discussion is a thorough overview of the implementation of both a scaled-down prototype as well as the final version of the testbed. This dissertation concludes by evaluating the of the transceiver testbed in terms of the narrowband dynamic range, the accuracy with which it can sample and reconstruct a UWB pulse, and the bit error rate performance of the overall system.Ph. D.
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Brake, David R. "'As if nobody's reading'? : the imagined audience and socio-technical biases in personal blogging practice in the UK." Thesis, London School of Economics and Political Science (University of London), 2009. http://etheses.lse.ac.uk/4/.
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This thesis examines the understandings and meanings of personal blogging from the perspective of blog authors. The theoretical framework draws on a symbolic interactionist perspective, focusing on how meaning is constructed through blogging practices, supplemented by theories of mediation and critical technology studies. The principal evidence in this study is derived from an analysis of in-depth interviews with bloggers selected to maximise their diversity based on the results of an initial survey. This is supplemented by an analysis of personal blogging’s technical contexts and of various societal influences that appear to influence blogging practices. Bloggers were found to have limited interest in gathering information about their readers, appearing to rely instead on an assumption that readers are sympathetic. Although personal blogging practices have been framed as being a form of radically free expression, they were also shown to be subject to potential biases including social norms and the technical characteristics of blogging services. Blogs provide a persistent record of a blogger’s practice, but the bloggers in this study did not generally read their archives or expect others to do so, nor did they retrospectively edit their archives to maintain a consistent self-presentation. The empirical results provide a basis for developing a theoretical perspective to account for blogging practices. This emphasises firstly that a blogger’s construction of the meaning of their practice can be based as much on an imagined and desired social context as it is on an informed and reflexive understanding of the communicative situation. Secondly, blogging practices include a variety of envisaged audience relationships, and some blogging practices appear to be primarily self-directed with potential audiences playing a marginal role. Blogging’s technical characteristics and the social norms surrounding blogging practices appear to enable and reinforce this unanticipated lack of engagement with audiences. This perspective contrasts with studies of computer mediated communication that suggest bloggers would monitor their audiences and present themselves strategically to ensure interactions are successful in their terms. The study also points the way towards several avenues for further research including a more in-depth consideration of the neglected structural factors (both social and technical) which potentially influence blogging practices, and an examination of social network site use practices using a similar analytical approach.
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Khire, Sourabh Mohan. "Time-sensitive communication of digital images, with applications in telepathology." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/29761.
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Thesis (M. S.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2010.Committee Chair: Jayant, Nikil; Committee Member: Anderson, David; Committee Member: Lee, Chin-Hui. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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Fouda, Ahmed Elsayed. "Electromagnetic Time-Reversal Imaging and Tracking Techniques for Inverse Scattering and Wireless Communications." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1366202740.
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Riseby, Emil, and Alexander Svensson. "Multispectral Imaging for Surveillance Applications." Thesis, Linköpings universitet, Medie- och Informationsteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-115731.
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Silicon based sensors is a commonly used technology in digital cameras today. That has made such cameras relatively cheap and widely used. Unfortunately they are constructed to capture and represent image quality for humans. Several image applications work better without the restrictions of the visible spectrum. Human visual restrictions are often indirectly put on technology by using images showing only visible light. Thinking outside the box in this case is seeing beyond the visible spectrum.
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Wang, Xiong. "Thermoacoustic Applications In Breast Cancer Detection And Communications." Diss., The University of Arizona, 2014. http://hdl.handle.net/10150/332895.
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In this dissertation, applications of thermoacoustic (TA) effect in breast cancer detection and wireless communications are explored. Thermoacoustic imaging (TAI) is a promising candidate for breast cancer detection. TAI creates an image of the internal morphological features of a dielectrically lossy sample by employing generated acoustic waves from absorbed microwave energy in the sample owing to the thermoacoustic effect based on thermoelastic expansion. Malignant tissues, usually embracing higher dielectric loss, absorbing more energy and emanating stronger acoustic waves than the surrounding healthy tissues, may be distinguished in the image. Besides high contrast inherited from microwave imaging and excellent resolution inherited from ultrasound imaging, TAI is also non-ionizing and noninvasive compared with other existing breast cancer imaging modalities. A potential clinically feasible TAI system is more cost-efficient and compact than mammography and especially MRI. Two sets of breast model are investigated by simulations in this work. The first set is made of a slab-shaped breast model. The main purpose of this study is to perform safety evaluation of TAI and calculate the amount of microwave power needed to generate a detectable acoustic pressure. The second set employs four realistic numerical breast phantoms to study the feasibility of applying contrast agents to TAI for breast cancer imaging, which is named as contrast-enhanced TAI (CETAI). The presented results unveil the promising potential of CETAI as a complementary safe, rapid, sensitive, accurate, high-resolution and breast-density-insensitive tomography for 3-D breast cancer detection. Compressive sensing (CS) is applied to significantly reduce the required number of measurements and expedite CETAI applications in breast cancer detection. Results show that the total measurements can be reduced by at least a factor of 13, which is very favorable to potential clinical applications. The second application of TAI explored in this work is wireless communications, which is referred to as thermoacoustic communications (TAC). It is proposed as a potential complementary method to mitigate the challenge in conventional wireless communication from air to water, in which the electromagnetic wave cannot penetrate deep in water. TAC employs a microwave antenna in air to irradiate the water surface with a microwave signal encoded with information to be communicated. Due to the thermoacoustic effect, acoustic waves are subsequently emanated from the water near the surface and propagate in the water with much less attenuation than electromagnetic waves and thus can propagate a longer distance in the water. Finally, an underwater device with an acoustic transducer can detect the generated acoustic signals and the information is acquired by decoding the signals. Its working principle is presented and proof-of-concept experiments are demonstrated. Parametric studies are performed to investigate the dependence of the generated acoustic signals on relevant parameters. Bit rate and link budget of TAC are derived to evaluate the probability of its potential practical applications.
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Burvall, Anna. "Axicon imaging by scalar diffraction theory." Doctoral thesis, KTH, Microelectronics and Information Technology, IMIT, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3736.
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Axicons are optical elements that produce Bessel beams,i.e., long and narrow focal lines along the optical axis. Thenarrow focus makes them useful ine.g. alignment, harmonicgeneration, and atom trapping, and they are also used toincrease the longitudinal range of applications such astriangulation, light sectioning, and optical coherencetomography. In this thesis, axicons are designed andcharacterized for different kinds of illumination, using thestationary-phase and the communication-modes methods.
The inverse problem of axicon design for partially coherentlight is addressed. A design relation, applicable toSchell-model sources, is derived from the Fresnel diffractionintegral, simplified by the method of stationary phase. Thisapproach both clarifies the old design method for coherentlight, which was derived using energy conservation in raybundles, and extends it to the domain of partial coherence. Thedesign rule applies to light from such multimode emitters aslight-emitting diodes, excimer lasers and some laser diodes,which can be represented as Gaussian Schell-model sources.
Characterization of axicons in coherent, obliqueillumination is performed using the method of stationary phase.It is shown that in inclined illumination the focal shapechanges from the narrow Bessel distribution to a broadasteroid-shaped focus. It is proven that an axicon ofelliptical shape will compensate for this deformation. Theseresults, which are all confirmed both numerically andexperimentally, open possibilities for using axicons inscanning optical systems to increase resolution and depthrange.
Axicons are normally manufactured as refractive cones or ascircular diffractive gratings. They can also be constructedfrom ordinary spherical surfaces, using the sphericalaberration to create the long focal line. In this dissertation,a simple lens axicon consisting of a cemented doublet isdesigned, manufactured, and tested. The advantage of the lensaxicon is that it is easily manufactured.
The longitudinal resolution of the axicon varies. The methodof communication modes, earlier used for analysis ofinformation content for e.g. line or square apertures, isapplied to the axicon geometry and yields an expression for thelongitudinal resolution. The method, which is based on abi-orthogonal expansion of the Green function in the Fresneldiffraction integral, also gives the number of degrees offreedom, or the number of information channels available, forthe axicon geometry.
Keywords:axicons, diffractive optics, coherence,asymptotic methods, communication modes, information content,inverse problems
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Tims, William Keith. "Masks and Sartre's Imaginary: Masked Performance and the Imaging Consciousness." Digital Archive @ GSU, 2007. http://digitalarchive.gsu.edu/communication_diss/10.
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The use of masks in performance and actor training is often linked to the imagination, but there is seldom discussion of the nature of this imaginary link. Using the philosophy of Jean-Paul Sartre (most especially his work The Imaginary) and the writings of modern mask theorists, this dissertation examines the relationship between masks and the imaging consciousness in both masked actors and the audiences who observe them. We discover that a mask is an analogon for an Other and that a mask authorizes games of identity which play out imaginatively in the performance milieu. In fact, generally speaking, a mask in performance is apprehended in a more imaginative way than a non-masked performance. Further than this, the mask illustrates the basic nature of the human consciousness and identity espoused by Sartre: that who we are is not a product of our psychology, but rather, the product of our imaginations and our choices. The dissertation concludes by suggesting that masks point to an alternative approach to character creation which likewise rejects psychology, and instead relies on physicality, abstraction, and ambiguity, all of which are essential to activating the imaging consciousness.
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Brinks, Raymond Gerald 1960. "A REPROGRAMMABLE HIGH SPEED INTERFACE DESIGN FOR A PICTURE ARCHIVING AND COMMUNICATION SYSTEM." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276488.
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High resolution imaging devices have made a digital medical archiving system feasible. The large volumes of information generated must be stored and retrieved at high data rates in order to insure the timely diagnosis of patients. This creates some unique technological challenges that must be resolved, including the problem dealing with multiple vendor products interacting in one environment. The high speed interface card design presented in this thesis is able to deal with different computer host busses as well as different interprocessor communication protocols. The ACR-NEMA standard has been implemented in the design as one possible network protocol that provides a solution that can be easily adapted to different vendors. The design has been analyzed using the Network II.5 simulation language. The simulation was performed to insure that the original objectives are met and to determine the impact on the protocols rated throughput.
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Nematbakhsh, Mohammed Ali. "Design and performance evaluation of a high-speed fiber optic integrated computer network for imaging communication systems." Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184597.
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In recent years, a growing number of diagnostic examinations in a hospital are being generated by digitally formatted imaging modalities. The evolution of these systems has led to the development of a totally digitized imaging system, which is called Picture Archiving and Communication System (PACS). A high speed computer network plays a very important role in the design of a Picture Archiving and Communication System. The computer network must not only offer a high data rate, but also it must be structured to satisfy the PACS requirements efficiently. In this dissertation, a computer network, called PACnet, is proposed for PACS. The PACnet is designed to carry image, voice, image pointing overlay, and intermittent data over a 200 Mbps dual fiber optic ring network. The PACnet provides a data packet channel and image and voice channels based on Time Division Multiple Access (TDMA) technique. The intermittent data is transmitted over a data packet channel using a modified token passing scheme. The voice and image pointing overlay are transferred between two stations in real-time to support the consultive nature of a radiology department using circuit switching techniques. Typical 50 mega-bit images are transmitted over the image channel in less than a second using circuit switching techniques. A technique, called adaptive variable frame size, is developed for PACnet to achieve high network utilization and short response time. This technique allows the data packet traffic to use any residual voice or image traffic momentarily available due to variation in voice traffic or absence of images. To achieve optimal design parameters for network and interfaces, the PACnet is also simulated under different conditions.
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Castillo, Aguilella Jose Elias. "Non Imaging Applications of Volume Diffractive Optics." Diss., The University of Arizona, 2012. http://hdl.handle.net/10150/238648.
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This dissertation presents theoretical and experimental work on non-imaging diffractive optics. The new use of devices based on this work is shown and grouped by application. First, devices for telecommunications applications are described: volume reflection Bragg gratings were designed for wavelength division multiplexing (WDM) and optical code division multiple access (OCDMA) applications. Two devices based on reflection Bragg filters are presented in this work. Tunable phenanthrenquinone-doped poly(methyl methacrylate) (PQ-PMMA) edge illuminated Bragg filters were found to be wavelength selectable via the application of a constant stress, either in tension or compression, allowing for a wavelength tuning of ~4.5nm. Silica on silicon, multichannel parallel anti-symmetric waveguide Bragg gratings (AWBG) are theoretically demonstrated based on coupled mode theory, mode overlap with parallel gratings and previous experimental results with single channel AWBGs. These parallel AWBG devices are shown to be scalable, with the device length increasing as the number of parallel channels increases. Second, diffractive devices based on flexible, volume transmission holograms are presented and demonstrated for low level solar concentration in latitude mounted applications. The film, arrayed next to the solar cells, directs the incoming solar irradiance incident upon it towards the solar cell. These holograms are shown to work for both silicon and Copper Indium Gallium diSelenide (CIGS) solar cells. New solar holographic designs for non-latitude mounting applications are also shown for common photovoltaic materials. The holographic designs are based on approximate coupled wave analysis (ACWA), the latitude and mounting angle of the application, the spectral response of the photovoltaic material, and the seasonal and daily sun angle position. The simulation work suggests that holograms optimized for non-latitude mounted applications contribute proportionately more energy throughout the year than earlier latitude mounted hologram designs.
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Imbert, Villà Marc. "Design and performance evaluation of millimeter-wave flat lens antennas for communications, radar and imaging applications." Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/397648.
Full textAbstract:
Millimeter-wave systems introduce a set of particular severe requirements from the antenna point of view in order to achieve specific performances. In this sense, high directive antennas are required to overcome the huge extra path loss. Moreover, each particular application introduces additional requirements. For example, in very high throughput (VHT) wireless personal area networks (WPANs) communication systems at 60 GHz band beam-steering antennas are needed to deal with high user random mobility and human-body shadowing characteristic of indoor environments. Similarly, beam-steering capabilities are
also needed in automotive radar applications at 79 GHz, since the determination of the exact position of an object is essential for most of the functions realized by the radar sensor. In the same way, beam-scanning, which is still commonly mechanically performed nowadays, is also needed in passive imaging systems at 94 GHz. Finally, from the integration perspective, the antennas must be small, low-profile, light weight and low-cost, in order to be successfully integrated in a commercial millimeter-wave wireless system.
For these reasons, many types of antenna structures have been considered to achieve high directivity and beam-steering capabilities for the aforementioned millimeter-wave communication, radar and imaging applications at 60, 79 and 94 GHz.
The most part of the currently adopted solutions are based on the expensive, complex and bulky phased-array antena concept. Actually, phased-array antenna systems can scan the beam at a fast rate. However, they require a complex integration of many expensive, lossy and bulky circuits, such as solid-state phase shifters and beam-forming networks.
This doctoral thesis has contributed to the study, development, and assessment of the performance of innovative antena solutions in order to improve the existing architectures at millimeter-wave frequencies, conveniently solving the problems related specifically to short-range high data rate communication systems at 60 GHz WPAN band (including future 5G millimeter-wave systems), automotive radar sensors at 79 GHz band, and communications, radar, and imaging systems at 94 GHz. The specific goals pursued in this work, focused on defining an alternative antenna architecture able to achieve a full reconfigurable 2-D beam-scanning of high gain radiation beams at millimeter-wave frequencies, has been fulfilled. In this
sense, this thesis has been mainly devoted to study in depth and practically develop the fundamental part of an innovative switched-beam antenna array concept: novel inhomogeneous gradient-index dielectric flat lenses, which, despite their planar antenna profile configurations, allow full 2-D beam-scanning of high gain radiation beams. A transversal study, going from theoretical investigations, passing by numerical analysis, new fabrication strategies, performance evaluation, and to full experimental assessment of the new antenna architectures in real application environment has been successfully carried out.Los sistemas a frecuencias de ondas milimétricas introducen una serie de requisitos muy estrictos desde el punto de vista de la antena con el objetivo de conseguir unos rendimientos específicos. En este sentido, se requieren antenas con una muy alta directividad con tal de conseguir superar las enormes pérdidas adicionales por propagación. Además, cada aplicación en concreto introduce unos requisitos adicionales. Por ejemplo, en redes de área personal de alta velocidad para sistemas de comunicación a la banda de 60 GHz, antenas con la capacidad de reconfiguración del haz de radiación son necesarias para poder tratar la problemática de la alta movilidad de los usuarios en entornos cerrados. De la misma forma, capacidades de reconfiguración de la orientación del haz de radiación son necesarias en aplicaciones relacionadas con radar de automoción a 79 GHz, dado que la determinación de la posición exacta de un objeto es esencial para muchas de las funciones del sensor de radar. De forma muy similar, la capacidad de apuntamiento del haz, que muchas veces todavía se realiza mediante sistemas mecánicos, es también imprescindible en sistemas de escaneo para aplicaciones biomédicas y de seguridad a 94 GHz. Finalmente, desde la perspectiva de la integración, las antenas deben ser eléctricamente pequeñas, ligeras, y económicas para poder ser incorporadas a un sistema inalámbrico comercial a frecuencias de onda milimétricas. Por todos estos motivos, diferentes tipos de estructuras de antenas han sido propuestos para conseguir alta directividad, junto con capacidades de reconfiguración y apuntamiento del haz de radiación para las aplicaciones anteriormente mencionadas y descritas en la banda de 60, 79, y 94 GHz. La solución tradicionalmente adoptada en este tipo de casos està estrictamente basada en el siempre caro, complejo y aparatoso concepto del phased-array. De hecho, los phased-arrays permiten el rápido escaneo de haces de radiación de alta directividad. Sin embargo, el hecho que requieran una compleja integración de muchos y caros componentes a alta frecuencia, tales como desfasadores de estado sólido o redes de conformación, los cuales introducen ciertos niveles de pérdidas, siendo además aparatosos, hacen que esta solución resulte inviable. La presente tesis doctoral contribuye al estudio, desarrollo, y ensayo experimental del rendimiento de soluciones de antenas innovadoras para la mejora de las existentes arquitecturas de antena en la banda frecuencial de las ondas milimétricas, convenientemente solucionando los problemas asociados específicamente a los sistemas de comunicación de corto alcance y alta velocidad a 60 GHz (incluyendo los futuros sistemas 5G a milimétricas), a los sistemas de radar de automoción a 79 GHz, y a los sistemas de comunicación, radar, y escaneo para aplicaciones a 94 GHz. Los objetivos específicos perseguidos en este trabajo académico, focalizados en definir una arquitectura alternativa de antena, capaz de conseguir una completa reconfiguración y escaneo de los haces de radiación en dos dimensiones del espacio a frecuencias de onda milimétricas, se han conseguido plenamente. En este sentido, esta tesis doctoral ha sido dedicada esencialmente al estudio en profundidad y desarrollo práctico de la parte fundamental del innovador concepto del switchedbeam array: nuevas lentes dieléctricas inhomogéneas de gradiente de índice con estructura plana, las cuales, a pesar de su configuración física totalmente llana, permiten una reconfiguración total, en dos dimensiones del espacio, de haces de radiación de alta directividad. Un estudio eminentemente transversal, que abarca desde la investigación teórica, pasando por el análisis numérico, nuevas metodologías y técnicas de fabricación, evaluación de rendimientos, hasta una completa caracterización y ensayo del rendimiento en entornos reales de aplicación de las nuevas arquitecturas de antena, se ha llevado a cabo con total éxito.
Els sistemes a freqüències d'ones mil·limètriques introdueixen una sèrie de requisits molt estrictes des del punt de vista de l'antena per tal d’aconseguir uns rendiments específics. En aquest sentit, es requereixen antenes amb una alta directivitat per aconseguir superar les enormes pèrdues addicionals per propagació. A més a més, cada aplicació en concret introdueix uns requeriments addicionals . Per exemple, en xarxes d'àrea personal d'alta velocitat per a sistemes de comunicació a la banda de 60 GHz, antenes amb la capacitat de reconfiguració del feix de radiació són necessàries per tal de poder tractar la problemàtica de l'alta mobilitat dels usuaris en entorns tancats . De la mateixa manera, capacitats de reconfiguració de l'orientació del feix de radiació són necessàries en aplicacions associades a radar d'automoció a 79 GHz, donat que la determinació de la posició exacta d'un objecte és essencial per moltes de les funcions portades a terme pels ens or del radar. De forma molt similar, la capacitat d'apuntament del feix, que moltes vegades encara es realitza per mitjà de sistemes mecànics, és també imprescindible en sistemes d'escaneig per aplicacions mèdiques i de seguretat a 94 GHz. Finalment, des de la perspectiva de la integració, les antenes han de ser petites en termes elèctrics, lleugeres, i econòmiques per tal de poder ser incorporades en un sistema sense fils comercial a freqüència d'ones mil·limètriques. Per aquestes raons , diversos tipus d'estructures d'antenes han sigut proposats per aconseguir alta directivitat, conjuntament amb la capacitat d'apuntament del feix de radiació per les aplicacions anteriorment descrites a les bandes de 60, 79, i 94 GHz. La solució tradicionalment adoptada en aquests casos és estrictament basada en el sempre car, complexe, i aparatós concepte del phased-array. De fet, els phased-arrays tenen la capacitat de reconfigurar a gran velocitat feixos de radiació d'alta directivitat. Tot i això, el fet que requereixin la complexa integració de molts components cars a alta freqüència, amb certs nivells de pèrdues i aparatosos, com són els desfasadors d'estat sòlid, i les xarxes de conformació, fan d'aquesta solució inviable. La present tesis doctoral contribueix a l'estudi, des envolupament, i assaig experimental del rendiment de solucions d'antenes innovadores per tal de millorar les existents arquitectures d'antena a la banda freqüencial de les ones mil·limètriques, convenientment solucionant els problemes associats específicament als sistemes de comunicació de rang proper d'alta velocitat a 60 GHz (incloent els futurs sistemes 5G a mil·limètriques ), als sistemes de radar d'automoció a la banda dels 79 GHz, i als sistemes de comunicació, radar, i escaneig per aplicacions a 94 GHz. Els objectius específics perseguits en aquest treball acadèmic, focalitzats en definir una arquitectura d'antena alternativa, capaç d'aconseguir una completa reconfiguració i escaneig dels feixos de radiació en dues dimensions de l'espaia freqüències d'ona mil·limètriques , s'han plenament aconseguit. En aquest sentit, aquesta tesis doctoral s'ha dedicat essencialment a l'estudi en profunditat i desenvolupament pràctic de la part fonamental de l'innovador concepte del switched-beam array: noves lents dielèctriques inhomogenees de gradient d'índex amb estructura planar, les quals, tot i preservar una configuració física totalment plana, permeten una reconfiguració total en dues dimensions de l'espai de feixos de radiació d'alta directivitat. Un estudi transversal, que comprèn des de la investigació teòrica, passant per l'anàlisi numèric, noves metodologies i tècniques de fabricació, avaluació de rendiments, fins a una completa caracterització i assaig del rendiment en entorns reals d'aplicació de les noves arquitectures d'antena s'ha dut a terme amb total èxit.
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Tadeyeske, Chelsea Raina. "Imagine If This Were In Comic Sans." Miami University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=miami1461847296.
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Benabdallah, Suzanne Nezha. "New model for long-range chromatin reorganisation upon enhancer-driven gene activation." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/23575.
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Enhancers are non-coding DNA sequences which are able to activate the expression of a gene in a specific tissue manner and at a precise stage during embryonic development. First identified almost 40 years ago, our growing understanding of enhancers has transformed the concept of gene regulation to recognise the key role of these sequences in the expression of many genes. Moreover, the identification of human diseases caused by genetic variation in non-coding enhancer elements highlights the importance of characterising enhancers in order to understand human disease. However, enhancers are often located far from the promoter they influence and the mechanisms through which enhancers govern gene expression remain unclear. The most widely accepted model for the action of distal enhancers involves the formation of a chromatin loop, in which the enhancer and promoter physically interact at the loop base. The kinetics or molecular basis for the formation of enhancer/promoter loops is unknown and it remains unclear whether this mechanism of enhancer communication is universal, or indeed whether it is the most pervasive. The aim of my PhD is to investigate further the mechanism of action of distal enhancers in the regulation of developmental genes. Using chromatin profiling during the differentiation of embryonic stem cells to neural progenitor cells in order to see which Shh enhancer is active in neural progenitor cells (NPCs), I report the identification of a novel long-range enhancer for Shh - Shh-Brain- Enhancer-6 (SBE6) – that is located 100kb upstream of Shh and that is required for the proper induction of Shh expression during a neural differentiation programme. SBE6 enhances Shh expression during the differentiation of neural progenitor cells (NPCs) and is active in the brain of developing zebrafish and mouse embryos. Next, using a super-resolution 3D-FISH based approach to study the enhancer-driven activation of the Sonic hedgehog gene (Shh) I have identified a novel mechanism of longrange enhancer regulation that is incompatible with the looping model. Instead, gene activation is associated with an increase in nuclear distance between Shh and Shh-Brain- Enhancers. Using a synthetic biology approach I have determined that the chromatin unfolding is regulated specifically by the Shh-Brain-Enhancer and is mediated by the recruitment of transcription factor SIX3 and Poly (ADP-Ribose) Polymerase 1. Chromatin decondensation upon gene activation has been observed previously in Drosophila polytene chromosomes. I suggest an analogous decompaction is driven by Shh-Brain-Enhancer to promote the activation of Shh in mouse neural progenitor cells. This ‘chromatin unfolding’ model represents a new mechanism of long-range enhancer-promoter communication in addition to the looping and tracking models.
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Konopka, Regiane Machado. "Moda imaginada : consumo, representações e atribuições de sentido à carreira fashion." Escola Superior de Propaganda e Marketing, 2017. http://tede2.espm.br/handle/tede/252.
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This research aimed to understand the attribution of meanings to the fashion career, from the social representations and the institutional discourses of the Higher Education Institutions (HEIs), and their connection with the constitution of identities professionals of young graduates in fashion. We reflect on the social imaginary about the fashion universe, from the point of view of the idealization of the daily life of professionals area. We carried out this study in the perspective of Communication and Consumption, organizing it in four driving axes of reflection, namely: Communication, Consumption, Identity and Fashion. Our theoretical-conceptual framework is based mainly on in Mary Ap. Baccega, Marcia Tondato, Gilles Lipovetsky, Vander Casaqui, Don Slater and Simone Tuzzo, among several other authors who contributed to the construction of search. As for the empirical material, we have two databases: one documents and images of the IES websites, to institutional discourses, and another one built from the realization of three focus groups composed of fashion students from three São Paulo colleges, which enabled us to understand the universe of beliefs and the aspirations of the students. For the analysis of the speeches of young people and HEIs, we adopted the principles of French Speech Analysis, the from Eni Orlandi, through which we interviewed about the future profession and the articulations with the formation of their identity professional. Synthetically, the result is that the symbolic sphere that fashion represents, and in which it is inserted, builds an ethos of the profession structured around the glamorization and spectacularization, but not without questioning because of its ephemeral nature and historically linked to frivolity. Our findings show us, however, that a change is taking place that manifests itself in a latent desire of the young people to resemantize fashion from a social and political dimension, in the private individual and more in the collective.
Esta pesquisa teve como objetivo compreender a atribuição de sentidos à carreira fashion, a partir das representações sociais e dos discursos institucionais das Instituições de Ensino Superior (IES), e sua conexão com a constituição das identidades profissionais dos jovens graduandos em moda. Refletimos sobre o imaginário social acerca do universo da moda, do ponto de vista da idealização do cotidiano de profissionais dessa área. Realizamos este estudo na perspectiva da Comunicação e do Consumo, organizando-a em quatro eixos condutores de reflexão, a saber: Comunicação, Consumo, Identidade e Moda. Nosso quadro teórico-conceitual está fundamentado principalmente em Maria Ap. Baccega, Marcia Tondato, Gilles Lipovetsky, Vander Casaqui, Don Slater e Simone Tuzzo, dentre outros diversos autores que contribuíram para a construção da pesquisa. Quanto ao material empírico, constituímos duas bases de dados: uma documental, formada por textos e imagens dos sites das IES, para compreender os discursos institucionais, e outra construída a partir da realização de três grupos focais compostos por estudantes de moda de três faculdades paulistanas, que nos permitiram entender o universo de crenças e as aspirações dos estudantes. Para a análise dos discursos dos jovens e das IES, adotamos princípios da Análise de Discurso de linha francesa, a partir principalmente de Eni Orlandi, por meio do qual identificamos a perspectiva dos entrevistados quanto à futura profissão e as articulações com a formação de sua identidade profissional. Sinteticamente, o resultado é que a esfera simbólica que a moda representa, e na qual está inserida, constrói um ethos da profissão estruturado em torno da glamorização e da espetacularização, mas não sem causar questionamentos devido à sua natureza efêmera e atrelada historicamente à frivolidade. Nossos achados nos mostram, contudo, que está em curso uma mudança que se manifesta em um desejo latente dos jovens em ressemantizar a moda a partir de uma dimensão social e política, calcada menos no indivíduo privado e mais na coletividade.
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Wahl, Jacob D. "Development and Characterization of an IoT Network for Agricultural Imaging Applications." DigitalCommons@CalPoly, 2020. https://digitalcommons.calpoly.edu/theses/2131.
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Smart agriculture is an increasingly popular field in which the technology of wireless sensor networks (WSN) has played a large role. Significant research has been done at Cal Poly and elsewhere to develop a computer vision (CV) and machine learning (ML) pipeline to monitor crops and accurately predict crop yield numbers. By autonomously providing farmers with this data, both time and money are saved. During the past development of a prediction pipeline, the primary focuses were CV and ML processing while a lack of attention was given to the collection of quality image data. This lack of focus in previous research presented itself as incomplete and inefficient processing models. This thesis work attempts to solve this image acquisition problem through the initial development and design of an Internet of Things (IoT) prototype network to collect consistent image data with no human interaction. The system is developed with the goals of being low-power, low-cost, autonomous, and scalable. The proposed IoT network nodes are based on the ESP32 SoC and communicate over-the-air with the gateway node via Bluetooth Low Energy (BLE). In addition to BLE, the gateway node periodically uplinks image data via Wi-Fi to a cloud server to ensure the accessibility of collected data. This research develops all functionality of the network, comprehensively characterizes the power consumption of IoT nodes, and provides battery life estimates for sensor nodes. The sensor node developed consumes a peak current of 150mA in its active state and sleeps at 162µA in its standby state. Node-to-node BLE data transmission throughput of 220kbps and node-tocloud Wi-Fi data transmission throughput of 709.5kbps is achieved. Sensor node device lifetime is estimated to be 682 days on a 6600mAh LiPo battery while acquiring five images per day. This network can be utilized by any application that requires a wireless sensor network (WSN), high data rates, low power consumption, short range communication, and large amounts of data to be transmitted at low frequency intervals.
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D'Assonville, Gustav Andre. "Factors affecting the acceptance and meaningful use of picture archive and communication systems by referring clinicians in private practice." Thesis, Nelson Mandela Metropolitan University, 2016. http://hdl.handle.net/10948/4688.
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A Picture Archive and Communication System (PACS) is a health information technology that facilitates the electronic storage, transmission, presentation and processing of digital medical-imaging datasets. The benefits of PACS have been well-documented. It provides a means to replace traditional film-based workflows and their inherent limitations. Referring clinicians’ acceptance is a critical factor in the overall success of a PACS implementation; and given the financial implications of project failure, research into physician acceptance and meaningful use is crucial. Very few PACS acceptance studies have focused on the referring clinicians, and even less in the context of the private sector. Therefore, the problem that this research aims to address is: There is a lack of understanding on which factors influence PACS acceptance and the meaningful use thereof by referring clinicians in private practice. This explorative study follows an embedded mixed methodology approach in order to meet the research objectives, favouring a qualitative method of inquiry with the support of a quantitative strand. Electronic questionnaires were distributed to private practice referring clinicians to probe the aspects related to PACS acceptance and its meaningful use. The conceptual framework, as devised by Paré and Trudel (2007), was used as a theoretical lens to categorize and discuss the research results in terms of Project, Technological, Organizational and Behavioural factors that affect PACS acceptance and its meaningful use. The findings showed good acceptance rates, which is in line with other research conducted in this field, including research done in the public sector. Technical and Organizational factors were the most prevalent. An extension of the above-mentioned theoretical framework was proposed to assist in maintaining positive results after the project Implementation phase has been completed. This research expands the Information Technology PACS body of knowledge – by identifying both the technical and the non-technical factors that are crucial in private practice referring doctor acceptance and meaningful use. By addressing these factors, institutions can improve the likelihood of PACS project success in private practice settings. Maximising referring doctor acceptance and meaningful use could also give private practices a competitive advantage over their competitors.
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Rostrom, Timothy James. "Framework to Secure Cloud-based Medical Image Storage and Management System Communications." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/3124.
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Picture Archiving and Communication Systems (PACS) have been traditionally constrained to the premises of the healthcare provider. This has limited the availability of these systems in many parts of the world and mandated major costs in infrastructure for those who employ them. Public cloud services could be a solution that eases the cost of ownership and provides greater flexibility for PACS implementations. This could make it possible to bring medical imaging services to places where it was previously unavailable and reduce the costs associated with these services for those who utilize them. Moving these systems to public cloud infrastructure requires that an authentication and encryption policy for communications is established within the PACS environment to mitigate the risks incurred by using the Internet for the communication of medical data. This thesis proposes a framework which can be used to create an authenticated and encrypted channel to secure the communications with a cloud-based PACS. This framework uses the Transport Layer Security (TLS) protocol and X.509 certificates to create a secured channel. An enterprise style PKI is used to provide a trust model to authorize endpoints to access the system. The validity of this framework was tested by creating a prototype cloud-based PACS with secured communications. Using this framework will provide a system based on trusted industry standards which will protect the confidentiality and integrity of medical data in transit when using a cloud-based PACS service.
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Felekoglu, Oktay. "Propagation and performance analysis for a 915 MHz wireless IR image transfer system." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Jun%5FFelekoglu.pdf.
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Thesis (M.S. in Applied Physics)--Naval Postgraduate School, June 2005.Thesis Advisor(s): Richard M. Harkins, Gamani Karunasiri. Includes bibliographical references (p. 77-78). Also available online.
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Schlutz, Matthew. "Synthetic Aperture Radar Imaging Simulated in MATLAB." DigitalCommons@CalPoly, 2009. https://digitalcommons.calpoly.edu/theses/92.
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This thesis further develops a method from ongoing thesis projects with the goal of generating images using synthetic aperture radar (SAR) simulations coded in MATLAB. The project is supervised by Dr. John Saghri and sponsored by Raytheon Space and Airborne Systems. SAR is a type of imaging radar in which the relative movement of the antenna with respect to the target is utilized. Through the simultaneous processing of the radar reflections over the movement of the antenna via the range Doppler algorithm (RDA), the superior resolution of a theoretical wider antenna, termed synthetic aperture, is obtained. The long term goal of this ongoing project is to develop a simulation in which realistic SAR images can be generated and used for SAR Automatic Target Recognition (ATR). Current and past Master’s theses on ATR were restricted to a small data set of Man-portable Surveillance and Target Acquisition Radar (MSTAR) images as most SAR images for military ATR are not released for public use. Also, with an in-house SAR image generation scheme the parameters of noise, target orientation, the elevation angle or look angle to the antenna from the target and other parameters can be directly controlled and modified to best serve ATR purposes or other applications such as three-dimensional SAR holography.
At the start of the project in September 2007, the SAR simulation from previous Master’s theses was capable of simulating and imaging point targets in a two dimensional plane with limited mobility. The focus on improvements to this simulation through the course of this project was to improve the SAR simulation for applications to more complex two-dimensional targets and simple three-dimensional targets, such as a cube. The input to the simulation uses a selected two-dimensional, grayscale target image and generates from the input a two-dimensional target profile of reflectivity over the azimuth and range based on the intensity of the pixels in the target image. For three-dimensional simulations, multiple two-dimensional azimuth/range profiles are imported at different altitudes. The output from both the two-dimensional and three-dimensional simulations is the SAR simulated and RDA processed image of the input target profile.
Future work on this ongoing project will include an algorithm to calculate line of sight limitations of point targets and processing optimization of the radar information generation implemented in the code so that more complex and realistic targets can be simulated and imaged using SAR for applications in ATR and 3D SAR holography.
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Schneider, Sabrina [Verfasser], and Andreas Jochen [Akademischer Betreuer] Fallgatter. "Verbal and nonverbal communication in schizophrenia - New insights from uni- and multimodal brain imaging / Sabrina Schneider ; Betreuer: Andreas Jochen Fallgatter." Tübingen : Universitätsbibliothek Tübingen, 2014. http://d-nb.info/1196878161/34.
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Benton, Hillary Ann. "Brain Imaging of Event Related Potentials in Children with Language Impairment." BYU ScholarsArchive, 2013. https://scholarsarchive.byu.edu/etd/3614.
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Event related potentials (ERPs) may provide specific information about how particular aspects of language are processed by the brain over time. This study investigated the electrophysiology of language processing in two children with language impairment (LI) when compared to five typically developing children. The N400, P600, and the early left anterior negativity (ELAN) were analyzed after participants listened to linguistically correct, syntactically incorrect, and semantically incorrect sentences. Participants were instructed to indicate whether the sentences were correct or incorrect. Latency and amplitude of the ERP components were compared between the two groups of participants and sentence types. Results from the current study concerning the typically developing children suggest that, at least by eight years of age, typically developing children may process linguistic information similarly to adults with regard to the areas of the brain that are activated during the processing of linguistic stimuli. When comparing results from participants with LI and their typically developing counterparts, results indicate that children with LI exhibit slower real-time language processing than typically developing children. Results also indicate that children with LI require more effort than typically developing children in processing linguistic information as indicated by the amplitude of the N400 and the ELAN. In analyzing the P600 in both groups of participants, results indicate that syntactic processing may be intact in children with LI as well as typical children. Results concerning the N400 and the ELAN were variable between the two participants with LI indicating that children with LI may be heterogeneous even in the presence of similar tasks. Results obtained from the ELAN may also indicate that the ELAN is not fully mature at eight years of age.
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Trujillo, Victor Esteban. "Global Shipping Container Monitoring Using Machine Learning with Multi-Sensor Hubs and Catadioptric Imaging." W&M ScholarWorks, 2019. https://scholarworks.wm.edu/etd/1582642585.
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We describe a framework for global shipping container monitoring using machine learning with multi-sensor hubs and infrared catadioptric imaging. A wireless mesh radio satellite tag architecture provides connectivity anywhere in the world which is a significant improvement to legacy methods. We discuss the design and testing of a low-cost long-wave infrared catadioptric imaging device and multi-sensor hub combination as an intelligent edge computing system that, when equipped with physics-based machine learning algorithms, can interpret the scene inside a shipping container to make efficient use of expensive communications bandwidth. The histogram of oriented gradients and T-channel (HOG+) feature as introduced for human detection on low-resolution infrared catadioptric images is shown to be effective for various mirror shapes designed to give wide volume coverage with controlled distortion. Initial results for through-metal communication with ultrasonic guided waves show promise using the Dynamic Wavelet Fingerprint Technique (DWFT) to identify Lamb waves in a complicated ultrasonic signal.
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Koller, Lynn. "GREEN CHAIRS, FICTIONAL PHALLUSES, INFILTRATION, AND LOVE ON THE ROCKS: MEDICAL IMAGING ARTIFACTS BLOWN UP." Doctoral diss., Orlando, Fla. : University of Central Florida, 2008. http://purl.fcla.edu/fcla/etd/CFE0002193.
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Monypenny, James Edward. "Development of quantitative live cell imaging techniques and their applications in the study of inter-cellular communication and Sarcoma cell motility." Thesis, University College London (University of London), 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.406165.
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Pottier, Erwan. "Porto Alegre, ville imaginaire : socialit?, mythes et communication dans un Br?sil postmoderne." Pontif?cia Universidade Cat?lica do Rio Grande do Sul, 2009. http://tede2.pucrs.br/tede2/handle/tede/4376.
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Previous issue date: 2009-02-06Este trabalho se baseia na sociologia do imagin?rio. Trata-se do imagin?rio de Porto Alegre, a sua constru??o, distribui??o bem como o rela??o entre eles. A primeira parte descreve e discute o conceito de imagin?rio na sociologia cl?ssica e contempor?nea. A segunda parte trata dos imagin?rios fundadores em Porto Alegre, e das suas rela??es aos im?ginarios do Brasil. A terceira parte trata do imagin?rio do cotidiano em Porto Alegre, atrav?s de v?rios itens, como a festa, a noite, a m?sica, mas tamb?m o futebol e a Internet. Estes momentos sociais s?o ent?o colocados em perspectiva como m?dias diferentes para transmitir estes mesmos imagin?rios. Por ?ltimo, estes diferentes imagin?rios s?o pensados como um imagin?rio da diferen?a, e finalmente ? discutido o conceito de anomia.
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Ghavami, Navid. "Ultra-wideband imaging techniques for medical applications." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:6f590d26-ee7c-41d7-a89b-393c864c9d82.
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Ultra-wideband (UWB) radio techniques have long promised good contrast and high resolution for imaging human tissue and tumours; however, to date, this promise has not entirely been realised. In recent years, microwave imaging has been recognised as a promising non-ionising and non-invasive alternative screening technology, gaining its applicability to breast cancer by the significant contrast in the dielectric properties at microwave frequencies of normal and malignant tissues. This thesis deals with the development of two novel imaging methods based on UWB microwave signals. First, the mode-matching (MM) Bessel-functions-based algorithm, which enables the identification of the presence and location of significant scatterers inside cylindrically-shaped objects is introduced. Next, with the aim of investigating more general 3D problems, the Huygens principle (HP) based procedure is presented. Using HP to forward propagate the waves removes the need to apply matrix generation/inversion. Moreover, HP method provides better performance when compared to conventional time-domain approaches; specifically, the signal to clutter ratio reaches 8 dB, which matches the best figures that have been published. In addition to their simplicity, the two proposed methodologies permit the capture of a minimum dielectric contrast of 1:2, the extent to which different tissues, or differing conditions of tissues, can be discriminated in the final image. Moreover, UWB allows all the information in the frequency domain to be utilised, by combining information gathered from the individual frequencies to construct a consistent image with a resolution of approximately one quarter of the shortest wavelength in the dielectric medium. The power levels used and the specific absorption rates are well within safety limits, while the bandwidths satisfy the UWB definition of being at least 20% of the centre frequencies. It follows that the methodologies permit the detection and location of significant scatterers inside a volume. Validation of the techniques through both simulations and measurements have been performed and presented, illustrating the effectiveness of the methods.
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Bardi, Benaiah George. "Musilingua : a model for thinking and communication based on the imaging of acoustically constituted two and three dimensional static and mobile configurations." Thesis, University of Southampton, 1990. https://eprints.soton.ac.uk/402130/.
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Kotze, P. P. A. (Pieter Paul Adriaan). "Development of a QPSK demodulator for the Sunsat 1 groundstation." Thesis, Stellenbosch : Stellenbosch University, 2000. http://hdl.handle.net/10019.1/51689.
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Thesis (MEng)--Stellenbosch University, 2000.ENGLISH ABSTRACT: The purpose of this thesis is the description of the development of a QPSK demodulator for the Sunsat 1 groundstation. A general overview of the functioning and requirements of a typical QPSK demodulator system is given. Several methods or algorithms for clock and carrier recovery are discussed. Specific attention is given to the QPSK demodulator chipset from Philips used for the implementation of the demodulator. The digital decoding logic used to serialize the parallel I and Q datastream is explained. Finally measurement techniques for performance evaluation of QPSK systems are investigated. As part of this the implementation loss of the developed QPSK demodulator is measured.
AFRIKAANSE OPSOMMING: Die doelwit van hierdie tesis is om die ontwikkeling van 'n QPSK demodulator vir die Sunsat 1 grondstasie te beskryf. 'n Algemene oorsig oor die funksionering en vereistes van 'n tipiese QPSK demodulator stelsel word gegee. Verskeie algoritmes en tegnieke vir klok en draersein herwinning word ondersoek en bespreek. Spesifieke verwysing word telkens gemaak na die QPSK demodulasie vlokkie paar van Philips gebruik vir die implementering van die demodulator. Die digitale dekodering logika benodig vir die datastroom verpakking word ondersoek en beskryf. Laastens word daar gekyk na meettegnieke en evaluasie van QPSK demodulasie stelsels se prestasie. As deel hiervan word die implementasie verlies van die ontwikkelde QPSK demodulator stelsel gemeet.
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McFarlane-Alvarez, Susan Lillian. "Imaging and the National Imagining: Theorizing Visual Sovereignty in Trinidad and Tobago Moving Image Media through Analysis of Television Advertising." Digital Archive @ GSU, 2006. http://digitalarchive.gsu.edu/communication_diss/3.
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Academic and popular discourse frequently positions postcolonial countries as receivers of visual culture rather than as producers and transmitters. These countries are often deemed as being subject to hegemonic forces of global media flows, the influx of foreign programming into their media landscapes hindering any significant development of distinct national identity through visual media. Since independence from British rule in 1962, government, media practitioners and viewers in the postcolonial Caribbean nation of Trinidad and Tobago have sought ways to build a national visual culture despite the inundation of non-local visual texts into the country. This study positions postcolonial Trinidad and Tobago as actively productive of its own identity, and through a cultural studies analysis of television advertising, examines the central role that this industry (including personnel, economic structure, equipment and texts) plays in the construction of a national visual culture. This process of collective imagining takes place within the visual imaging of the advertising industry, and ultimately charts the undoing of colonial, hegemonic discourses within the broader mediascape. Ultimately the advertising industry facilitates the active negotiation of national identity, catalyzing the process of visual sovereignty.