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1
Spence, Charles J. „Audiovisual links in attention“. Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264512.
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2
Papageorgiou, Kostas A. „Individual differences in infant visual attention : links to child temperament, behaviour and genetic variation“. Thesis, Birkbeck (University of London), 2015. http://bbktheses.da.ulcc.ac.uk/114/.
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Individual differences in infants’ visual attention have been associated with individual variation in cognition in childhood. However, it has not been explored the degree to which individual variation in newborn and infant visual attention relates to individual differences in some forms of temperament and behaviour in childhood. Furthermore, little is known about the genetic causes of individual differences on newborn and infant visual attention. Chapter 1 will review studies on individual differences in infant visual attention. Chapter 2 will review all genetic studies on infant attention, temperament and behaviour. Chapter 3 will present results of a study that explored the degree to which individual differences in infant mean fixation duration (mean age = 7.69 months) are associated with some forms of temperament and behaviour in childhood (sample mean age = 41.59 months). It was found that infant mean fixation duration predicted positively child effortful control and negatively surgency and hyperactivity-inattention. Chapter 4 will present a study that explored whether individual differences in newborn average dwell time (mean age = 2.20 days) are associated with some forms of temperament and behaviour in childhood (mean age = 90.00 months). Newborn mean dwell time predicted negatively child surgency and behavioural difficulties. Chapters 5 will present analyses that explore the degree to which genome-wide variants previously found to increase the liability for ADHD and schizophrenia are associated with infant mean fixation duration and newborn average dwell time. Τhe findings suggest that individual differences in infant visual attention are linked to attentional and behavioural control in childhood. Results are presented on the genetic mechanisms underlying individual differences in infant attention. Chapter 6 will evaluate critically the findings and will present limitations of this work to inform future studies.
3
Strelčiūnienė, Rima. „Miglotosios logikos grandžių ir struktūrų modelių sudarymas“. Master's thesis, Lithuanian Academic Libraries Network (LABT), 2004. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2004~D_20040910_120958-38538.
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The topic of the work for Master’s degree is: “The formation of fuzzy logic links and structural models”.
The purpose of this work is to design a calculator, which would make arithmetic operations with the elements of fuzzy logic. This programme would allow to make such operations with fussy logic elements: addition (+), substraction (–), multiplication (×), division
( : ).
Five main parts are presented in the work: analytical one, designed one, the documentation of the consumer, the evaluation of fuzzy logic calculator, the conclusions.
In the first part the analysis of fussy arithmetic operation is made, the operations which can be applied in designing are given.
In the second part the requirements of the consumer are analyzed and functional requirements are given.
The specification of the system is made. The schedule of the project performance is set. The measures of project hazard and prevention are set. The testing, which has been made is described. The plan of system developing is presented.
In the third part the documentation of consumer is written.
In the fourth part a thorough analysis of calculator working is made, its advantages and disadvantages, fields of application are singled out.
The fifth part is the conclusions. Fussy logic makes it possible to achieve much better management characteristics than by traditional methods. One may use the designed calculator by teaching the course of “Calculating methods with indefinite sets” and will help students to master... [to full text]
4
Alkhalil, Fadi. „Stereo visual servoing from straight lines“. Phd thesis, Université de Strasbourg, 2012. http://tel.archives-ouvertes.fr/tel-00750946.
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Closing the control loop of a manipulator robot with vision feedback is widelyknown. It concerns nowadays all areas of robotics. Such a return can make a comparison between a desired state and current state, using visual measurements. The main objective of this doctoral thesis is to design several types of kinematic control laws for stereo visual servoing. It strongly involves the formalism of the task function which is a well-known and useful mathematical tool to express the visual error as a function of state vectors.We have investigated the decoupling between the rotational and translational velocities control laws together with the epipolar constraint with a stereo visual feedback.That is why, the visual measurements and features used in this thesis are the 3Dstraight lines.The interests of this type of visual features rely on the robustness against the noise, and the possibility to represent straight lines or other features like points or planes pairs by the Plücker coordinates, as a 3D straight line can be represented as well by two points or the intersection of two planes. This makes all the control laws designed in this thesis valid for another visual features like points
5
Melikian, Simon Haig. „Visual Search for Objects with Straight Lines“. Case Western Reserve University School of Graduate Studies / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=case1134003738.
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6
Rogers, Erika. „Visual interaction : a link between perception and problem-solving“. Diss., Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/9117.
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7
Smith, Mathew Neville. „EDUC : a visual database for supporting link chart analysis“. Thesis, Birkbeck (University of London), 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.406701.
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Link Analysis (LA) is a visual data analysis technique originally developed for analysing crime related data. The technique enables the user to gain a better understanding of the connections between objects of interest in the problem domain by displaying the connections in a form of network diagram referred to as a link chart. A link chart is often altered during its lifetime, as part of the exploratory nature of the knowledge discovery process, to reflect new information, and to increase the level of comprehensibility. To provide the necessary flexibility for accessing and manipulating large volumes of data the data collected in an investigation is often stored in a database. Permitting link charts to be constructed from this data is of great value, as LA is not adequately supported by the database query systems currently available. This is because the record-based data models they often use are inappropriate for modelling connections between objects, the query languages they typically provide can only retrieve connections between objects if the way connections may be derived are specified in the query, and their data visualisation facilities generally do not allow the results of a number of queries to be integrated and edited. This thesis concerns the Exploratory Database View Constructor (EDVC), an experimental visual database interface for supporting LA. The results obtained from a user evaluation of EDVC indicate that the system may be used by individuals with no experience of interacting directly with a database management system (DBMS). This is a consequence of the style of interaction supported, which allows the data stored to be browsed without having to possess explicit knowledge of the database schema. Such knowledge is typically a prerequisite for using a database query language and can prevent productive use of such a language by an inexperienced DBMS user.
8
Schmude, Naja von [Verfasser], und Bernd [Akademischer Betreuer] Jähne. „Visual Localization with Lines / Naja von Schmude ; Betreuer: Bernd Jähne“. Heidelberg : Universitätsbibliothek Heidelberg, 2017. http://d-nb.info/1177688581/34.
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9
Blackwood, Andria Lynn. „Curating Inequality: The Link Between Cultural Reproduction and Race in the Visual Arts“. Kent State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=kent1321704421.
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10
Lee, Katherine, und katielee mail@gmail com. „Embodying the Built World: Drawing Boundaries, Walking Lines“. RMIT University. Art, 2009. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20091015.141915.
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Intro In this practice-led research project I investigate relations between structures of coercion in the built world and sculptural language. The aim of my project is to present a series of exhibitions and situations that examine architectures of bodily discipline as practices of form/space composition and spatial manipulation. Such architectures range from the delineation of public space to the choreography of bodies by urban design. The project engages the viewer in a dialogue around art and the spatio-visual codes that embody what Michel Foucault regarded as the coercive powers of modern 'carceral culture'. I research a range of studio and workshop, site and gallery based processes contextualised by contemporary notions of sculpture, materiality and art practice. I work from a position derived from the writings on art by the minimalist sculptor Robert Morris (1966, 1970), Rosalind Krauss (1977, 1979) and Hal Foster (1996), which stress the experience of the viewer as an integral part of the art work and emphasise the nature of art work in 'real' spaces. Proposed Project To investigate relations between 'structures of coercion' in the built world and sculptural language through a series of exhibitions and situations (installations at ARIs, public collaborative works, studio documentations) that examine architectures of bodily discipline as practices of form/space composition and spatial manipulation. The proposed artworks will engage the viewer in a dialogue around art and the spatio-visual codes that exist in urban space. Main objective The main objective of this research project is to: Identify new ways of understanding spatio-visual codes of discipline in the city through sculpture practice.
11
Smith, Jackson. „The link between neural activity in area MT of visual cortex and motion perception“. Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=110544.
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The transformation from action potentials to perception can only beunderstood by first explaining how the brain uses sensory neural responses todrive perceptual behaviour. It is currently unknown to what extent this is achievedby bottom-up or top-down processes. In a bottom-up model, sensory neuralactivity has a direct impact upon perceptual performance. But in a top-downmodel, the subject's high-order mental state determines perceptual performance,while also feeding signals back down to sensory neurones. The validity of eithermodel is complicated by the prediction that the link between sensory neurones andperceptual behaviour is critically affected by the level of correlation betweensensory neural signals.In this thesis, three main questions are asked to better understand how thebrain connects sensory neural activity to perceptual behaviour. (1) Can a bottom-up model explain the detection of visual motion? (2) Do visual neurones receivetop-down signals that predict motion detection performance? (3) Is the connectionof visual neurones to motion detection related to the correlations between visualneural signals?To answer these questions, we recorded neural activity from the middletemporal area (MT i.e. V5) of visual cortex – while monkey subjects performed amotion-detection task. The experiment was designed to separate bottom-up fromtop-down activity in time, by using a brief and unpredictable motion signal tocontrol when the neurones were informative. Separation was further achieved bycomparing the bottom-up versus top-down spectral components of local fieldpotentials that were recorded alongside the spiking responses. The potentialsources of neural correlation were limited by choosing pairs of neurones withreceptive fields that did not overlap, and by recording each neurone on a separateelectrode 1–2 mm from its partner. Crucially, the motion stimuli were tailored tomaximise the contribution of each neurone to the subject's detection performance.There were three major observations. (1) The link between MT spikingresponses and the subject's detection performance was well accounted for by abottom-up model. (2) Top-down signals arrived in MT, but after the local, bottom-up response to the motion signal. (3) The correlation between a pair of MTneurones was dynamic, and varied with the pair's link to motion detectionperformance. Altogether, the results presented in this thesis favour a bottom-upconnection between sensory neurones and perceptual behaviour, but suggest adynamic interaction between sensory responses and top-down signals.La transformation des potentiels d'action en perception ne peut êtrecomprise qu'en expliquant d'abord la façon dont le cerveau utilise les réponsesneurosensorielles pour dicter le comportement perceptif. À l'heure actuelle, nousignorons dans quelle mesure cela est accompli par les processus ascendant etdescendant. Dans un modèle ascendant, l'activité neurosensorielle a une incidencedirecte sur la perception. Cependant, dans un modèle descendant, l'état mentald'ordre supérieur du sujet détermine la perception, tout en alimentant également leretour des signaux vers les neurones sensoriels. La validité de chaque modèle estcomplexifiée par la prédiction que le lien entre les neurones sensoriels et lecomportement perceptif est fortement influencé par le niveau de corrélation entreles signaux neurosensoriels.Dans la présente thèse, trois questions importantes sont posées afin demieux comprendre la façon dont le cerveau relie l'activité neurosensorielle aucomportement perceptif. (1) Un modèle ascendant peut-il expliquer la détectiond'un mouvement visuel? (2) Les neurones visuels reçoivent-ils des signauxdescendants qui prédisent la détection du mouvement? (3) La connexion entre lesneurones visuels et la détection du mouvement est-elle liée aux corrélations entreles signaux neurovisuels?Pour répondre à ces questions, nous avons enregistré l'activité neuronalede la région temporale médiane (MT i.e. V5) du cortex visuel pendant que lessujets simiens effectuaient un exercice de détection du mouvement. L'expériencea été conçue afin de distinguer l'activité ascendante de l'activité descendante dansle temps au moyen d'un signal mobile bref et imprévisible pour capter le momentoù les neurones échangeaient de l'information. On a poussé la distinction encomparant les composantes spectrales, ascendante et descendante, des potentielsde champs locaux qui ont été enregistrées pendant les réponses de décharge. Lessources potentielles de corrélation neurale ont été limitées en choisissant despaires de neurones ayant des champs réceptifs qui ne se chevauchaient pas, et enenregistrant le signal de chaque neurone à l'aide d'une électrode distincte située à1 à 2 mm de sa contrepartie. Il a été tout particulièrement important d'adapter lesstimuli mobiles pour maximiser la contribution de chaque neurone à la détectiondu sujet.Trois observations majeures ont été faites. (1) Le lien entre les réponses dedécharge de l'aire MT et la détection du sujet est bien expliqué par un modèleascendant. (2) Les signaux descendants sont arrivés dans l'aire MT, mais après laréponse ascendante locale au signal mobile. (3) La corrélation entre une paire deneurones de l'aire MT et le lien de la paire par rapport à la détection dumouvement a été dynamique et variée. Somme toute, les résultats présentés danscette thèse favorisent une connexion ascendante entre les neurones sensoriels et lecomportement perceptif, mais suggèrent une interaction dynamique entre lesréponses sensorielles et les signaux descendants.
12
Foster, Rosie. „Plants signalling to herbivores : is there a link between chemical defence and visual cues?“ Thesis, University of Sussex, 2013. http://sro.sussex.ac.uk/id/eprint/45168/.
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The use of visual cues by insect herbivores is likely to be an important component of plant-herbivore interactions in the wild, yet has until recently received little attention from researchers. In the last decade, however, interest in this topic has intensified following Hamilton & Brown's (2001) autumn colouration hypothesis, which proposes that the intensity of colouration of trees at autumn time is a signal of their defensive commitment to potential herbivores. This idea remains controversial and to date robust empirical data linking colouration with chemical defence and herbivory have been lacking. This thesis begins with a meta-analysis, in which I synthesize and analyse previously published data to determine the evidence for the use of host plant colouration by herbivores. I then move to explore the relationship between chemical defences and colouration in a classic plant-herbivore system: the wild cabbage (Brassica oleracea) and its herbivores the cabbage white butterfly (Pieris rapae) and the cabbage aphid (Brevicoryne brassicae). Both species have colour vision, and I use spectral sensitivity data to model the colour of the host ‘through the eyes' of the herbivores. First, I present data from a field study of wild cabbage populations showing significant relationships between herbivory, plant colouration and levels of glucosinolates defensive compounds. These results suggest that plant colouration could be used by herbivores to gain information about plant chemical defence. I then show colouration has a fixed genetic component in a common garden experiment; a necessary requirement for evolution of a colour signal. I explore the use of colouration in host choice by herbivores in more detail in a series of behavioural experiments. I show that cabbage aphids do not use leaf brightness as a cue when selecting among plants, but they do respond to different leaf colours. I also show that cabbage white butterflies do not choose hosts based on particular colour cues, even though this colouration potentially provides important information about host defence levels, which are shown to impact upon offspring fitness. Together, these results provide a clear demonstration of a link between plant chemistry and colouration in the wild cabbage system. However, the data presented in this thesis indicate that the use of colouration as a guide to host defence is limited, and I conclude by discussing possible reasons why this might be the case.
13
Helsby, Wendy Frances. „Comics in education : the link between visual and verbal literacy : how readers read comics“. Thesis, University of Southampton, 1999. https://eprints.soton.ac.uk/194425/.
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This case study investigates how readers read comics. The work, based upon Roland Barthes' concept of relay discussed in Image, Music, Text (1977), considers that a reader tmderstands the comic at the higher level of the diegesis by switching between signifying systems. The research fmdings suggest that the reading of comics requires visual and verbal intermediate literacy skills and that textual coherence occurs for readers when they reach the critical point in their own reading. The coherence of the text and critical point for the reader are achieved as a result of the cOlmections between the signifying systems of description and depiction, at the level of the individual sign and the textual structure. The analysis of such data as the features of the comic and readers' responses to texts, proposes a model based upon the concept of a core and periphery spiral. It suggests that knowledge frameworks, visual and verbal literacy and the metalinguistic skill of 'relay' are required to read the comic text; but in order to reach a critical point for understanding these need to be synthesised with affective responses. The comic form is also placed into a cultural and literacy context and implications of the fmdings for using this form in education are discussed.
14
Östlund, Gustaf. „Läsa: Mellan Rutorna : Reading: Between the Lines“. Thesis, Konstfack, Grafisk design & illustration, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:konstfack:diva-8001.
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Projektet handlar om att utforska hur man läser och skapar en serietidning. Under mitt liv har jag använt mig av min fantasi för att lösa problem. Jag växte upp i en idyllisk och konservativ villaförort i norra Stockholm, där man förväntades vara som normen. Jag hade svårt att passa in och flydde istället in i min fantasi och det var då jag började läsa serietidningar.
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Dawson, Thomas. „Red Lines & Hockey Sticks : A discourse analysis of the IPCC’s visual cultureand climate science (mis)communication“. Thesis, Uppsala universitet, Institutionen för ABM, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-445887.
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Within the climate science research community there exists an overwhelming consensus on the question of climate change. The scientific literature supports the broad conclusion that the Earth’s climate is changing, that this change is driven by human factors (anthropogenic), and that the environmental consequences could be severe. While a strong consensus exists in the climate science community, this is not reflected in the wider public or among policymakers, where sceptical attitudes towards anthropogenic climate change is much more prevalent. This discrepancy in the perception of the urgency of the problem of climate change is an alarming trend and likely a result of a failure of science communication, which is the topic of this thesis. This paper analyses the visual culture of climate change, with specific focus on the data visualisations comprised within the IPCC assessment reports. The visual aspects of the reports were chosen because of the prioritisation images often receive within scientific communication and for their quality as immutable mobiles that can transition between different media more easily than text. The IPCC is the central institutional authority in the climate science visual discourse, and its assessment reports, therefore, are the site of this discourse analysis. The analysis tracks the development and variations in the IPCC’s visual culture, investigates in detail the use of colour and the visual form of the “Hockey Stick” graph. This work is undertaken to better understand the state of the art of climate science data visualisation, in an effort to suggest the best way forward to bridge the knowledge gap between the scientific community and the public on this important issue. The thesis concludes that a greater emphasis on the information aesthetics of their data visualisations could benefit the IPCC’s pedagogical reach, but that it may also be argued that it is not the IPCC’s role in climate change discourse to produce the most visually persuasive images. That they exist as a tone-setting institution that provides authority to entities that are better geared towards wider communication, such as journalism and activism.
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Tesař, Michal. „Návrh na zlepšení výrobní linky BS Unit ve výrobní společnosti“. Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2017. http://www.nusl.cz/ntk/nusl-316960.
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The thesis focuses on the analysis of the current production system on the production line BS Unit in the company Daikin Device Czech Republic, s.r.o. in terms of material flow and move of worker. The main outcome is the proposal of precaution for improvement of the currently production of proces.The first part of the thesis describes the basic terms and methods from the field of industrial engineering. These findings are then used for data analysis and for the solution proposal in the analytical part.
17
Blackett, Norman. „Developing understanding of trigonometry in boys and girls using a computer to link numerical and visual representations“. Thesis, University of Warwick, 1990. http://wrap.warwick.ac.uk/2307/.
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18
Zhao, Yanji. „The Journey from Chinese Landscape Paintings to Architecture“. University of Cincinnati / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1491318233161403.
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19
Fors, Vaike. „The Missing Link in Learning in Science Centres“. Doctoral thesis, Luleå : Luleå University of Technology, 2006. http://epubl.luth.se/1402-1544/2006/07.
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20
Teruya, Hideko. „Deciding to Look: Revisiting the Link between Lexical Activations and Eye Movements in the Visual World Paradigm in Japanese“. Thesis, University of Oregon, 2019. http://hdl.handle.net/1794/24212.
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All current theories of spoken word recognition (e.g., Allopenna et al., 1998; McClelland & Elman, 1986; Norris, 1994) suggest that any part of a target word triggers activation of candidate words. Visual world paradigm studies have relied on the linking hypothesis that the probability of looking at the referent of a word directly tracks the word’s level of activation (e.g., Allopenna et al., 1998).
However, how much information is needed to trigger a saccade to a visual representation of the word’s referent? To address this question, the present study manipulated the number and location of shared segments between the target and competitor words. Experimental evidence is provided by two visual world paradigm experiments on Japanese, using natural and synthesized speech. In both experiments, cohort competitor pictures were not fixated more than unrelated distractor pictures unless the cohort competitor shares the initial CVC with the target. Bayesian analyses provide strong support for the null hypothesis that shorter overlap does not affect eye movements. The results suggest that a listener needs to accumulate enough evidence for a word before a saccade is generated.
The human data were validated by an interactive computational model (TRACE: McClelland & Elman, 1986). The model was adapted to Japanese language to examine whether the TRACE model predicts competitor effects that fit human data. The model predicted that there should be effects when words share any amount with a target which confirms the current theory. However, the model did not fit the human data unless there is longer overlap between words. This indicates that eye movements are not as closely tied to fixation probabilities of lexical representations as previously believed.
The present study suggests that looking at a referent of a word is a decision, made when the word’s activation exceeds a context-specific threshold. Subthreshold activations do not drive saccades. The present study conclude that decision-making processes need to be incorporated in models linking word activation to eye movements.
21
Steenkamp, Martha Katharina Johanna. „An investigation into visual problems of crane operators at a petrochemical factory and the possible link with exposure to hydrocarbons / M.K.J. Steenkamp“. Thesis, North-West University, 2004. http://hdl.handle.net/10394/198.
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The aim of this investigation was to determine the exposure to total hydrocarbons
including toluene and to determine if there are any relation between exposure to toluene
and visual problems experienced by crane operators. Exposure to industrial chemicals can
affect a number of sensory capacities including colour perception. The nature of a crane
operator's duties does not allow for any error in judgement since this can have disastrous
consequences. Colour vision and contrast sensitivity tests were performed on all 30
operators and on the control group. The results obtained from analysing air samples using
OVM badges revealed levels of toluene ranging from 0 to 0.477 ppm. These levels are
well below the threshold limit value (TLV) for toluene which is 50ppm. Hydrocarbon
levels were also determined by biological monitoring. The levels of hippuric acid/g
creatinine and ortho-cresol/ g creatinine in the urine were also lower than the threshold
values. Some subjects of the experimental group did have problems with colour and
contrast discrimination. Evident from the results is the fact that more problems regarding
contrast sensitivity and colour discrimination were observed on the Friday than on the
Monday but not statistically significantly so. Considering the findings, recommendations
are made regarding minimum risk levels (MRLs) for toluene.Thesis (M.Sc. (Occupational Hygiene))--North-West University, Potchefstroom Campus, 2004.
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Pereira, Thomas Tadeu de Oliveira. „Estudo e desenvolvimento de antena de microfita aplicada à veículos aéreos não tripulados para inspeção em linhas de transmissão“. Universidade Federal Rural do Semi-Árido, 2018. http://bdtd.ufersa.edu.br:80/tede/handle/tede/848.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
In wireless communications, there is a growing need for more compact and portable systems. In this context, research related to the development of antennas has intensified in recent years, especially those related to microstrip antennas, since these have unique properties as well as several applications. In this work, two different antenna configurations were designed, an array of microstrip antennas for the transmitting device and a single element with an omnidirectional pattern for the receiver, according to the needs of the application. The antennas are designed by the Transmission Line Theory according to the frequency of radio operation and the electrical and physical properties of the substrates used. The results were obtained through simulations in the ANSYS HFSS® software, and the best results were used to fabricate the devices in order to validate the simulations performed. The results of the simulations reached the characteristics of the application, as the return losses of both antennas were in accordance with the frequency band of the application in the band ISM in 2.4 GHz, with respect to the behavior of the radiation, the antenna proposed to the transmitter had a gain of 6.1 dB, approximately three times greater than the commonly used dipole / monopole antenna. The experimental result of the loss of return was shown to be in agreement with the simulated standard, in spite of the frequency displacement, both antennas constructed were suitable for application in the radio control of the UAV, having the microstrip array 7.5 MHz of bandwidth in the band of application and the simple element proposed to the 58.5 MHz receiver. The antennas were then implemented in the radiofrequency system and a range test was performed in order to verify the communication of the devices, presenting satisfactory results. Thus, a flight is performed via software for visual inspection of transmission lines, aiming the collection of images for analysis
Em comunicações sem fio, existe uma crescente necessidade por sistemas mais compactos e portáteis. Nesse contexto, as pesquisas relacionadas ao desenvolvimento de antenas têm se intensificado nos últimos anos, em especial, as relacionadas às antenas de microfita, visto que estas possuem propriedades singulares, bem como diversas aplicações. Neste trabalho foram projetadas duas configurações distintas de antenas, um arranjo de antenas de microfita para o dispositivo transmissor e um elemento simples com padrão omnidirecional para o receptor, de acordo com as necessidades da aplicação. As antenas são projetadas pela Teoria da Linha de Transmissão de acordo com a frequência de operação do rádio e as propriedades elétricas e físicas dos substratos utilizados. Os resultados foram obtidos através de simulações no software ANSYS HFSS®, e os melhores resultados foram utilizados para fabricação dos dispositivos a fim de validar as simulações realizadas. Os resultados das simulações atingiram as características da aplicação, pois as perdas de retorno de ambas antenas apresentaram conformidade com a faixa de frequências da aplicação na banda ISM em 2,4 GHz, no que diz respeito ao comportamento da radiação, a antena proposta ao transmissor teve ganho de 6,1 dB, aproximadamente três vezes maior do que a antena dipolo/monopolo comumente utilizada. O resultado experimental do coeficiente de reflexão se mostrou concordante com o padrão simulado, apesar do deslocamento de frequência, ambas antenas construídas se adequaram para aplicação no rádio controle do VANT, tendo o arranjo de microfita 7,5 MHz de largura de banda na faixa de aplicação e o elemento simples proposto ao receptor 58,5 MHz. Em seguida, as antenas foram implementadas no sistema de radiofrequência e foi realizado um teste de alcance a fim de averiguar a comunicação dos dispositivos, apresentando resultados satisfatórios. Desse modo, um voo foi realizado para inspeção visual de linhas de transmissão, visando a coleta de imagens para análise
2018-04-25
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Ameli, Nikola, Isabela Schachinger und Natela Khrikina. „Visuell kommunikation : En studie om könsneutralt mode“. Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-12730.
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Hur kan modeföretag genom sin kommunikation leva upp till sina koncept om könsneutralt mode? Under en längre tid har en debatt kring könsroller och könsuppdelning pågått, och modebranschens sätt att skildra män och kvinnor har kritiserats hårt. Modet framhäver vad som skiljer sig mellan det manliga och det kvinnliga alltmer, samtidigt som fler modeföretag börjar förmedla koncept om könsneutralt mode. Det är inte bara plaggen i sig som gör det svårt att könsöverskrida, media har även en stor påverkan, både på samhället som stort, och på individnivå. Vad konsumenter önskar se i media stämmer inte alltid med det företagen kommunicerar ut. Samhället strävar efter ökad genusmedvetenhet, jämställdhet och jämlikhet. För att en skillnad skall kunna ske krävs en förändrad inställning och en faktisk förändring, inte minst i modebranschen. En del forskare menar att kampanjer med representationer av icke stereotypiska könsroller spelar en positiv social roll för att en samhällsförändring gradvis skall ske. Vi har undersökt två utvalda företag som kommunicerar den typen av reklam och om deras butiker lever upp till de koncepten som de förmedlar i kampanjerna. Makt gestaltas i vad en bär för plagg. Åhléns ville med sin kampanj, Bryt Klädmaktsordningen , belysa förhållandet mellan kön, plagg och makt. Forskare menar att en kvinna klättrar upp i maktstegen om hon bär stereotypt maskulina plagg medan en man går ner i maktstegen. Samhället har accepterat att se kvinnan representera något som värderas lika högt som mannens plagg, vilket förknippas med dagens unisexmode. Hur skulle det se ut om rollerna byttes? Syftet med denna uppsats var att undersöka hur modebutiker genom sin kommunikation lever upp till sina koncept om könsneutralt mode samt föreslå hur företagen kan förbättra kommunikationen av begreppet könsneutralt mode till konsumenterna. För att kunna besvara syftet användes teoretiska modeller som identifierar vart det brister i kommunikationen som företagen försöker att förmedla till konsument. Det empiriska materialet bestod av två intervjuer, fyra fokusgrupper, observationer och pressmaterial. Först utfördes en intervju med en doktor i modevetenskap som också är idékläckare bakom Åhléns kampanj “Bryt klädmaktsordningen”. En intervju genomfördes med sekreteraren på transföreningen Full Personality Expression Sweden. Sedan fick vi en pressrelease utav projektledaren bakom & Other Stories kampanj “The Gaze & Other Stories”. Därefter lät vi våra fokusgrupper se samtliga kampanjfilmer och tolka vad för koncept kampanjerna förmedlar för att sedan diskutera kring hur företag kan leva upp till konceptets idé i deras fysiska butiker. Två observationer gjordes i de två respektive företagens butiker vars kampanjer vi utgått ifrån. Modebranschen är en av många olika sändare som utsätter oss för budskap och ideal, varför den blir mer synlig än andra branscher i fråga, handlar om att den är påtagligt mer synlig. Vi, ihop med alla respondenter hoppas på att en förändring är på väg, mot mer jämställdhet och jämlikhet, samt att den nya generationen som nu stiger in i branschen kommer att bidra till en förändring i vad som sänds ut genom de olika marknadsföringskanalerna. Viktigt att tänka på är att förändringar sker konstant, även inom modet. En förändring större än trender kommer att ske men frågan är: När?Visual communication of gender neutral clothing within the fashion industryA study that examines whether chosen companies live up to the concept of gender neutral fashion. How can fashion companies through their communication live up to their concepts of gender neutral fashion? During a longer period of time there has been a debate on gender roles and segregation of genders, also within the fashion industry. The way it divides and depicts the differences between men and women has been criticized for a long time. A change is coming, there are more and more fashion companies that mediate concepts of gender neutral fashion within their communication. What consumers wish to see when it comes to the way fashion companies communicate concepts about gender neutral fashion do not often accord with the way they are actually communicating it. The concepts are not cohesive, the way it is displayed in their communication does not match what you are exposed to in their stores. Our society strives for an increase of gender awareness, gender equality and equality. In order for a change to happen, a change of attitude and an actual alteration needs to happen, not at least in the fashion industry.
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Fintling, Nils, und Johan Ling. „Automatiserad projektering av gång- och cykelbro- med parameterstyrd dimensionering via Grasshopper“. Thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-69984.
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En projekteringsprocess av en konstruktion kan ofta delas in i två delar, dimensionering ochprojektering. Dimensioneringen utförs enligt för konstruktionen gällande normkrav ochprojekteringen följer sina egna normer samt den dimensionering som är utförd.Även om 2D-projektering fortfarande är vanligt förekommande i projekteringen har BIMmodelleringblivit allt vanligare och värdet av att lagra information i en modell ses alltmersom en nytta i ett projekt.BIM-modelleringen bygger på parameterstyrning av objekt och egentligen finns inga gränserför vilka parametrar som ska ingå i ett objekt.En av de senaste utvecklingarna i projekteringsprocessen är den visuella programmeringensom ger användare möjlighet att styra parametrar till en BIM-modell med hjälp av ett visuelltskript kopplat till BIM-modelleringsverktyget.Det här arbetet syftar på att visa hur ett skript kan driva modelleringen med hjälp avprojektspecifika indata genom att dimensionering av objekt integreras i programmeringen.Med hjälp av programmeringen kan även dimensioneringen redovisas i en annanprogramvara.Resultatet visar att det är fullt möjligt att skapa en modell med hjälp av objektspecifika indataoch att parametrar kan styras med integrerad dimensionering i ett skript skapat med visuellprogrammering.A design process of a construction can often be divided into two parts, structural design anddrawing. The structural design is made with current standard requirements for theconstruction while the drawing has its own standard requirements along with the results fromthe dimensioning to follow.Even if 2D- drawing still is common in design of a project, BIM-modelling has become morefrequently used and the value of storing information in a model is see more and more as abenefit in a project.The BIM-modelling is based on parametric design of objects and there are actually no limitsto which parameters that should be a part of an object.One of the most recent developments in the design process is the visual programming whichgives users the opportunity to guide parameters in a BIM-model through a visual scriptconnected to the BIM-modelling tool.This work is aiming to show how a script can push the modelling by using project specificinput and perform structural design of load bearing members integrated in the script. With theuse of the script, results can also be verified in another software.Result is showing that it is possible to create a structurally designed model by using only afew object specific inputs and that parameters can be controlled in a script made with visualprogramming.
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Halbach, Till. „Error-robust coding and transformation of compressed hybered hybrid video streams for packet-switched wireless networks“. Doctoral thesis, Norwegian University of Science and Technology, Faculty of Information Technology, Mathematics and Electrical Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-136.
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This dissertation considers packet-switched wireless networks for transmission of variable-rate layered hybrid video streams. Target applications are video streaming and broadcasting services. The work can be divided into two main parts.
In the first part, a novel quality-scalable scheme based on coefficient refinement and encoder quality constraints is developed as a possible extension to the video coding standard H.264. After a technical introduction to the coding tools of H.264 with the main focus on error resilience features, various quality scalability schemes in previous research are reviewed. Based on this discussion, an encoder decoder framework is designed for an arbitrary number of quality layers, hereby also enabling region-of-interest coding. After that, the performance of the new system is exhaustively tested, showing that the bit rate increase typically encountered with scalable hybrid coding schemes is, for certain coding parameters, only small to moderate. The double- and triple-layer constellations of the framework are shown to perform superior to other systems.
The second part considers layered code streams as generated by the scheme of the first part. Various error propagation issues in hybrid streams are discussed, which leads to the definition of a decoder quality constraint and a segmentation of the code stream to transmit. A packetization scheme based on successive source rate consumption is drafted, followed by the formulation of the channel code rate optimization problem for an optimum assignment of available codes to the channel packets. Proper MSE-based error metrics are derived, incorporating the properties of the source signal, a terminate-on-error decoding strategy, error concealment, inter-packet dependencies, and the channel conditions. The Viterbi algorithm is presented as a low-complexity solution to the optimization problem, showing a great adaptivity of the joint source channel coding scheme to the channel conditions. An almost constant image qualiity is achieved, also in mismatch situations, while the overall channel code rate decreases only as little as necessary as the channel quality deteriorates. It is further shown that the variance of code distributions is only small, and that the codes are assigned irregularly to all channel packets.
A double-layer constellation of the framework clearly outperforms other schemes with a substantial margin.
Keywords — Digital lossy video compression, visual communication, variable bit rate (VBR), SNR scalability, layered image processing, quality layer, hybrid code stream, predictive coding, progressive bit stream, joint source channel coding, fidelity constraint, channel error robustness, resilience, concealment, packet-switched, mobile and wireless ATM, noisy transmission, packet loss, binary symmetric channel, streaming, broadcasting, satellite and radio links, H.264, MPEG-4 AVC, Viterbi, trellis, unequal error protection
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Fulton, Neale Leslie Aerospace & Mechanical Engineering Australian Defence Force Academy UNSW. „Regional airspace design: a structured systems engineering approach“. Awarded by:University of New South Wales - Australian Defence Force Academy. School of Aerospace and Mechanical Engineering, 2002. http://handle.unsw.edu.au/1959.4/38722.
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There has been almost fifteen years of political controversy surrounding changes to the rules and procedures by which aircraft conduct their flight within regional Australia. Decisions based on a predominately heuristic (rule of thumb) approach to design have had many adverse consequences for the integrity of the proximity warning function. A sound mathematical model is required to establish this function on a mature engineering foundation. To achieve this, the proximity warning function has been investigated as a hybrid-system. This approach recognises the dual nature of the design: that aircraft dynamics give rise to continuous mathematical models while the communication protocols controlling proximity require discrete mathematical approaches. The blending of each aspect has yielded a deeper insight into the operational limitations and failure modes of this function. The presentation of the thesis follows a design thread through the function. It begins with a description of existing standards and implementations. Risk models are then developed. The pilot interface is recognised as a primary design constraint. Mathematical models are then developed to describe the topology of flow, proximity dynamics, and the scheduling constraints associated with visual, voice, and data-link communications required by the proximity warning function. These analyses show that many aspects of design can be bounded by analytical formulae that bring new robustness to the design and resolve some of the misconceptions arising from the often inaccurate perceptions of present airspace operations. Failure modes, unaccounted for in existing designs are found to actually aggravate failure in the very situations in which the airspace design should be robust and should act to prevent collisions. In particular, there are divergences of performance between the demands required by the system design and the ability of the pilot to deliver such performances. In some cases, these failures may be traced to policy decisions such as service between Instrument Flight Rule and Visual Flight Rule category aircraft. On the basis of the conclusions of this research, a formal engineering review of the proximity warning function is required to assure the containment of the likelihood of mid-air collision for all future operations.
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Mohd, Noor Mohd Junaizee. „Application of knowledge-based fuzzy inference system on high voltage transmission line maintenance“. Queensland University of Technology, 2004. http://eprints.qut.edu.au/16050/.
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A majority of utilities conduct maintenance of transmission line components based on the results of routine visual inspection. The inspection is normally done by inspectors who detect defects by visually checking transmission line components either from the air (in helicopters), from the ground (by using high-powered binoculars) or from the top of the structure (by climbing the structure).
The main problems with visual inspection of transmission lines are that the determination of the defects varies depending on the inspectors' knowledge and experience and that the defects are often reported qualitatively using vague and linguistic terms such as "medium crack", "heavy rust", "small deflection". As a result of these drawbacks, there is a large variance and inconsistency in defect reporting (which, in time, makes it difficult for the utility to monitor the condition of the components) leading to ineffective or wrong maintenance decisions. The use of inspection guides has not been able to fully address these uncertainties.
This thesis reports on the application of a visual inspection methodology that is aimed at addressing the above-mentioned problems. A knowledge-based Fuzzy Inference System (FIS) is designed using Matlab's Fuzzy Logic Toolbox as part of the methodology and its application is demonstrated on utility visual inspection practice of porcelain cap and pin insulators. The FIS consists of expert-specified input membership functions (representing various insulator defect levels), output membership functions (indicating the overall conditions of the insulator) and IF-THEN rules. Consistency in the inspection results is achieved because the condition of the insulator is inferred using the same knowledge-base in the FIS rather than by individual inspectors. The output of the FIS is also used in a mathematical model that is developed to suggest appropriate component replacement date.
It is hoped that the methodology that is introduced in this research will help utilities achieve better maintenance management of transmission line assets.
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Wilson, Anna Naomi. „What is, and what might be, learned from images shared during Twitter conversations among professionals?“ Thesis, University of Stirling, 2016. http://hdl.handle.net/1893/24371.
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This thesis explores the pedagogical potential of images shared during intra-professional conversations held on the social media platform, Twitter. Twitter chats are loosely synchronous exchanges of tweets sharing a unique, identifying keyword or hashtag. They are increasingly being used among professionals to create professional networks in which practice-knowledge and opinion might be shared and where communal connections may be created. As such, they may serve as sites in which professional learning unfolds, both in relation to workplace practices and in relation to the development of new forms of professional practice around social media use. Because the exchanges and broadcasts on Twitter are, for the most part, public, and the conversations are ongoing, they also provide open, freely-accessible, and constantly renewing resources for use in pre-service learning contexts. The research focused on two example chats, one held among midwives and the other among teachers. Inspired by the increasing use of images in new forms of digital communication, the research used images tweeted during the chats as starting points from which to explore flows of knowledge and affect. Data were generated from observations of the two Twitter chats over extended periods, together with interviews with practising professionals, student professionals and their educators in which images were used as elicitation devices. The research combined an approach to reading and “being with” data inspired by ideas drawn from the work of Deleuze (1994; Williams 2013) and Deleuze and Guattari (1988; Massumi 1992), with approaches to reading images drawn from visual social semiotics (Kress and van Leeuwen 1996). The findings suggest that Twitter chats such as those studied here can provide rich opportunities for professional learning. Practice knowledge can flow from one participant to many others, and flows of affect can be used to remoralize individuals and communities. Both chats seemed to serve as sites in which professionals could experience a positivity and affirmation that was not always available in the workplace. However, the forces and intensities at play in these spaces influence both what is said and what is not said, creating new norms of online interaction that generally seemed to avoid negative comments or open disagreement. Educators saw potential to use images such as those shared in the chats in a variety of ways. For example, images could be used as prompts for examination and critique of practices. The educators I interviewed also suggested that the images could be used to help student professionals develop their sensitivity to the forces and intensities that produce particular practices. Group interviews with student professionals suggested that the former happened spontaneously when students encountered and discussed such images, but that the latter might need deliberate facilitation or prompting. The thesis concludes with some recommendations for: (i) educators considering using such images in pre-service professional learning; (ii) professional developers considering using Twitter chats; and (iii) policy-makers involved in drafting guidelines for professionals’ use of social media.
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Medvedskienė, Violeta. „Poggendorfo iliuzijos stiprumo ir akių dominavimo įvertinimas“. Master's thesis, Lithuanian Academic Libraries Network (LABT), 2011. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20110712_092109-81659.
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Poggendorfo iliuzijos stiprumas didėja mažinant kampą tarp pasvirųjų ir vertikalių tiesių ir didinant atstumą tarp vertikalių tiesių. Poggendorfo iliuzijos stiprumas mažinant kampą tarp pasvirųjų ir vertikalių tiesių (išskyrus 5°) ir atstumą tarp vertikalių statistiškai reikšmingai (p-reikšmė 0,000-0,006) susijęs. Remiantis visais Poggendorfo iliuzijos stiprumo rezultatais tiriamuosius pagal akies dominavimą galima suskirstyti 61,7% tikslumu. Tiriamųjų akies dominavimo klasifikavimas pagal Poggendorfo iliuzijos stiprumą keičiant kampą tarp pasvirųjų ir vertikalių tiesių galimas 48,0% tikslumu. Tiriamųjų akies dominavimo klasifikavimas pagal Poggendorfo iliuzijos stiprumą keičiant atstumą tarp vertikalių tiesių galimas 49,0% tikslumu. Pagal visus Poggendorfo iliuzijos matavimus kairės ir dešinės akies dominavimą (neįtraukiant tiriamųjų, kurių abi akys dominuojančios) galima numatyti 88,9% (kairės akies dominavimą galima numatyti 87,5%, dešinės – 89,7%) tikslumu.There are many research on visual perception illusions but still there are many questions how visual system create illusory perception. There is no only theory and only mechanism which could explain the basic depth illusions. There is presumption that different illusions determine by different factors, which ones could be related with the structure of the eye and the neural interactions in retina, other ones – with superior level – the processing of cognitive information. The Poggendorff illusion is not the exception. The goal of this work is to explore the strenth of Poggendorff illusion while changing the angle between sloping and vertical lines and the distance between vertical lines, and its relation with the dominance of the eye. The tasks: 1. To measure the strength of Poggendorff illusion while changing the angle between sloping and vertical lines. 2. To measure the strength of Poggendorff illusion while changing the distance between vertical lines. 3. To explore the relation between the strength of Poggendorff illusion while changing the angle between sloping and vertical lines and the distance between vertical lines. 4. To compare the strength of Poggendorff illusion between left and right dominant eye having subjects. The Poggendorff illusion was given by the computer-based program. The subjects have to find the continuation of the sloping line while changing the angle between sloping and vertical lines and the distance between vertical lines. 135 subjets (17 men... [to full text]
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Seba, Ali. „Fusion de données capteurs visuels et inertiels pour l'estimation de la pose d'un corps rigide“. Thesis, Versailles-St Quentin en Yvelines, 2015. http://www.theses.fr/2015VERS020V/document.
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Cette thèse traite la problématique d'estimation de la pose (position relative et orientation) d'un corps rigide en mouvement dans l’espace 3D par fusion de données issues de capteurs inertiels et visuels. Les mesures inertielles sont fournies à partir d’une centrale inertielle composée de gyroscopes 3 axes et d’accéléromètres 3 axes. Les données visuelles sont issues d’une caméra. Celle-ci est positionnée sur le corps rigide en mouvement, elle fournit des images représentatives du champ visuel perçu. Ainsi, les mesures implicites des directions des lignes, supposées fixes dans l’espace de la scène, projetées sur le plan de l’image seront utilisées dans l’algorithme d’estimation de l’attitude. La démarche consistait d’abord à traiter le problème de la mesure issue du capteur visuel sur une longue séquence en utilisant les caractéristiques de l’image. Ainsi, un algorithme de suivi de lignes a été proposé en se basant sur les techniques de calcul du flux optique des points extraits des lignes à suivre et utilisant une approche de mise en correspondance par minimisation de la distance euclidienne. Par la suite, un observateur conçu dans l’espace SO(3) a été proposé afin d’estimer l’orientation relative du corps rigide dans la scène 3D en fusionnant les données issues de l’algorithme de suivi de lignes avec les données des gyroscopes. Le gain de l’observateur a été élaboré en utilisant un filtre de Kalman de type M.E.K.F. (Multiplicative Extended Kalman Filter). Le problème de l’ambigüité du signe dû à la mesure implicite des directions des lignes a été considéré dans la conception de cet observateur. Enfin, l’estimation de la position relative et de la vitesse absolue du corps rigide dans la scène 3D a été traitée. Deux observateurs ont été proposés : le premier est un observateur en cascade avec découplage entre l’estimation de l’attitude et l’estimation de la position. L’estimation issue de l’observateur d’attitude alimente un observateur non linéaire utilisant des mesures issues des accéléromètres afin de fournir une estimation de la position relative et de la vitesse absolue du corps rigide. Le deuxième observateur, conçu quant à lui directement dans SE(3) , utilise un filtre de Kalman de type M.E.K.F afin d’estimer la pose par fusion de données inertielles (accéléromètres, gyromètres) et des données visuelles. Les performances des méthodes proposées sont illustrées et validées par différents résultats de simulationAbstractThis thesis addresses the problems of pose estimation of a rigid body moving in 3D space by fusing data from inertial and visual sensors. The inertial measurements are provided from an I.M.U. (Inertial Measurement Unit) composed by accelerometers and gyroscopes. Visual data are from cameras, which positioned on the moving object, provide images representative of the perceived visual field. Thus, the implicit measure directions of fixed lines in the space of the scene from their projections on the plane of the image will be used in the attitude estimation. The approach was first to address the problem of measuring visual sensors after a long sequence using the characteristics of the image. Thus, a line tracking algorithm has been proposed based on optical flow of the extracted points and line matching approach by minimizing the Euclidean distance. Thereafter, an observer in the SO(3) space has been proposed to estimate the relative orientation of the object in the 3D scene by merging the data from the proposed lines tracking algorithm with Gyro data. The observer gain was developed using a Kalman filter type M.E.K.F. (Multiplicative Extended Kalman Filter). The problem of ambiguity in the sign of the measurement directions of the lines was considered in the design of the observer. Finally, the estimation of the relative position and the absolute velocity of the rigid body in the 3D scene have been processed. Two observers were proposed: the first one is an observer cascaded with decoupled from the estimation of the attitude and position estimation. The estimation result of the attitude observer feeds a nonlinear observer using measurements from the accelerometers in order to provide an estimate of the relative position and the absolute velocity of the rigid body. The second observer, designed directly in SE (3) for simultaneously estimating the position and orientation of a rigid body in 3D scene by fusing inertial data (accelerometers, gyroscopes), and visual data using a Kalman filter (M.E.K.F.). The performance of the proposed methods are illustrated and validated by different simulation results
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Paula, Maurício Braga de. „Visão computacional para veículos inteligentes usando câmeras embarcadas“. reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/122511.
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O uso de sistemas de assistência ao motorista (DAS) baseados em visão tem contribuído consideravelmente na redução de acidentes e consequentemente no auxílio de uma melhor condução. Estes sistemas utilizam basicamente uma câmera de vídeo embarcada (normalmente fixada no para-brisa) com o propósito de extrair informações acerca da rodovia e ajudar o condutor num melhor processo de dirigibilidade. Pequenas distrações ou a perda de concentração podem ser suficientes para que um acidente ocorra. Este trabalho apresenta uma proposta para o desenvolvimento de algoritmos para extrair informações sobre a sinalização em rodovias. Mais precisamente, serão abordados algoritmos de calibração de câmera explorando a geometria da pista, de extração da marcação de pintura (sinalização horizontal) e detecção e identificação de placas de trânsito (sinalização vertical). Os resultados experimentais indicam que o método de calibração de câmera alcançou bons resultados na obtenção dos parâmetros extrínsecos com erros inferiores a 0:5 . O erro médio encontrado nos experimentos com relação a estimativa da altura da câmera foi em torno de 12 cm (erro relativo aproximado de 10%), permitindo explorar o uso da realidade aumentada como uma possível aplicação. A acurácia global para a detecção e reconhecimento da sinalização horizontal (marcas seccionadas, contínuas e mistas) foi acima de 96% perante uma diversidade de situações apresentadas, tais como: sombras, variação de iluminação, degradação do asfalto e pintura. O uso da câmera calibrada para a detecção da sinalização vertical contribui para delimitar o espaço de varredura da janela deslizante do detector, bem como realizar a procura por placas em uma única escala para cada região de busca, caracterizada pela distância ao veículo. Os resultados apresentados reportam uma taxa global de classificação de aproximadamente 99% para o sinal de proibido ultrapassar, considerando-se uma base de dados limitada a 962 amostras.The use of driver assistance systems (DAS) based on computer vision has helped considerably in reducing accidents and consequently aid in better driving. These systems primarily use an embedded video camera (usually fixed on the windshield) for the purpose of extracting information about the highway and assisting the driver in a better handling process. Small distractions or loss of concentration may be sufficient for an accident to occur. This work presents the development of algorithms to extract information about traffic signs on highways. More specifically, this work will tackle a camera calibration algorithm that exploits the geometry of the road track, algorithms for the extraction of road marking paint (lane markings) and detection and identification of vertical traffic signs. Experimental results indicate that the proposed method for obtaining the extrinsic parameters achieve good results with errors of less than 0:5 . The average error in our experiments, related to the camera height, were around 12 cm (relative error around 10%). Global accuracy for the detection and classification of road lane markings (dashed, solid, dashed-solid, solid-dashed or double solid) were over 96%. Finally, our camera calibration algorithm was used to reduce the search region and to define the scale of a slidingwindow detector for vertical traffic signs. The use of the calibrated camera for the detection of traffic signs contributes to define the scanning area of the sliding window and perform a search for signs on a unique scale for each region of interest, determined by the distance to the vehicle. The results reported a global classification rate of approximately 99% for the no overtaking sign, considering a limited of 962 samples.
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VENUTA, MARIA LUISA. „La città da energivora a nodo attivo delle reti di produzione e di scambio energetico“. Doctoral thesis, Università Cattolica del Sacro Cuore, 2007. http://hdl.handle.net/10280/85.
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Il concetto di rete dell'informazione può diventare uno schema logico con cui descrivere l'evoluzione delle politiche sulle energie rinnovabili e sulla sostenibilità?
La ricerca è stata svolta analizzando l'architettura delle due reti (internet e reti energetiche) e l'evoluzione del bene prodotto e distribuito nella rete energetica, l'energia, esplicitando l'accessibilità da parte della distribuzione mondiale delle risorse petrolifere tradizionali e delle risorse rinnovabili. La struttura metodologica del progetto di ricerca si basa due tipi di analisi teorica:
1) l'analisi della nascita delle società in rete attraverso le teorie di Manuel Castells (concetto di spazio di flussi) e di Saskia Sassen e l'evoluzione delle città (cap.2 e cap.5)
2) le analisi dei flussi dei materiali e delle energie avendo come riferimento metodologico l'approccio ecologico ideato dai ricercatori dell'istituto per il Clima, l'Ambiente e l'Energia di Wuppertal, Germania (cap.3 e cap.4)
La contraddizione tra città innovative e città che sono ai livelli di enormi discariche o di baraccopoli è esposta nel cap.6 attraverso casi studio e progetto dei Programmi Europei.
Nell'ultimo capitolo (cap.7) si riassumono le ipotesi di partenza e i risultati della ricerca e si espongono le questioni aperte.Can internet logic scheme be used as a basis to describe public policies evolution on renewable energies production and sharing in urban areas all over the world? The research project analyses the two networks (internet and energetic grids) architectures in actual and future urban areas. This analysis is connected with present and future forecasts energy productions from traditional fuels and from renewable sources. Theoretical analysis is conducted following a double conceptual pathway: - societal networks (Manuel Castells theory) and urban areas evolution (Saskia Sassen and Mike Davis) in order to picture the evolution of cities and towns in modern economies and in developing countries (Chapters 2 and 5); - Material and Energy Flow Analysis (approach by Wuppertal Institute for Climate, Environment and Energy) applied to renewable energy (Chapters 3 and 4) In Chapter 6 case studies are exposed on the deep cleavage between two different worlds: innovative, rich towns on a side and the landfills cities, slums on the other side. In the last part hypothesis and thesis are put together and open questions are explained (Chapter 7).
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Poço, Diogo Miguel Tavares. „VisualChain: Visual Inspection in Production Lines“. Master's thesis, 2020. http://hdl.handle.net/10316/93958.
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Dissertação de Mestrado Integrado em Engenharia Electrotécnica e de Computadores apresentada à Faculdade de Ciências e TecnologiaO controlo de qualidade é uma etapa necessária na linha de produção de todas as fábricas, o que se pode tornar num constrangimento se feito manualmente. Este procedimento manual não só pode ser lento, mas também pode estar sujeito a erros humanos. Este projeto faz um estudo de diferentes métodos para automatizar o procedimento de controle de qualidade em placas de correntes de bicicleta usando métodos não intrusivos por um meio de visão por computador. O objetivo é criar um sistema mais confiável e acelerar este processo de inspeção, exigindo o mínimo de interação com o operador. Para resolver este problema, três sistemas diferentes foram desenvolvidos. Um dos sistemas faz uma verificação baseada em imagens, usando apenas uma câmara e luz direcionada de vários ângulos para detetar e medir as placas considerando apenas duas dimensões, tornando-se assim um sistema rápido e preciso, mas sem efetuar uma verificação de qualidade completa. Os outros dois sistemas têm o mesmo objetivo, complementar o sistema baseado em imagens, fazendo uma reconstrução tridimensional das placas. Estes são o Sistema de Varrimento por Laser e o Sistema de Luz Estruturada. As reconstruções resultantes destes dois sistemas são comparadas, discutindo assim o sistema mais apropriado. Após a aquisição da reconstrução das placas, a nuvem de pontos é comparada com uma outra nuvem de pontos modelo, completando o controle de qualidade com a verificação se a placa cumpre os requisitos necessários para o seu uso.
Quality control is a necessary step in the production lines of all factories, which can become a bottleneck if done manually. A manual quality control procedure not only is slower but can also be prone to human errors. Therefore, this project studies different methods to automate bicycle chainplates' quality control procedures using non-intrusive methods through computer vision. The goal is to create a more reliable system and accelerate the plates' inspection of an existing quality control, requiring minimal interaction with the operator. Three different systems were developed to solve this problem. An image-based quality control system uses only one camera and directed light from different angles to detect and measure the plates considering only two dimensions, making it a fast and accurate method. However, this system does not complete the plates' inspection, requiring another source of information, requiring an additional process. The other two systems share the same goal: complementing the image-based system by acquiring a three-dimensional reconstruction of the plates. These are the projection-based: Laser Stripe Scanning and the Structured Light System. The resulted reconstructions of these two scanning systems are discussed, and the more efficient system is chosen. After acquiring the plates' 3D information, the point cloud is processed and compared to a model point cloud, completing the quality control by verifying if the plates have the needed requirements for their use.
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Thomas, Nathan. „Fault lines : homophobic visual perceptions of masculinity“. Thesis, 2017. http://hdl.handle.net/10321/2499.
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Submitted in fulfillment of the requirements of the Degree of Master of Applied Arts: Graphic Design, Durban University of Technology, 2017.This study explores connections between masculinity and homophobia in a Faculty of Arts and Design at a South African university. Connections between masculinity and homophobia may have consequences for the visual representation of the male body in graphic design. Literature suggests that gender is socially constructed and performed, and that masculinity and homophobia are connected. As such understanding this connection might assist graphic designers who are often tasked with visually representing gendered bodies. The study uses critical theory as the research orientation for inquiry, which is then related to masculinity studies. Photo elicitation using context-free images of male body language in focus groups is the main data generation strategy. Multimodal Critical Discourse Analysis with particular reference to participants’ personal stake and interest in masculinity are employed as analytical tools. Overall, the research data reveals four discursive ‘positions’ in relation to visual perceptions of body language: human or situational performance of masculinity, socially gendered performance of masculinity, effeminate or ‘gay’ performance of masculinity, and homosexual performance of masculinity. However, in the data these positions overlap and combine when participants manage their stake or interest in masculinity. The thesis of this study is therefore that homophobic visual perceptions of masculinity may permeate gender performance as ‘fault lines’. Although the study finds these homophobic fault lines in visual perceptions of masculinity, there is also evidence of acceptance of non-mainstream forms of masculinity.
M
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Chuan, Hsiao Hu, und 蕭木川. „The Perception and Application of Living Esthetics in Visual Art----Experiencing the Visual Art of Dots, Lines, Dimensions, and Colors“. Thesis, 2006. http://ndltd.ncl.edu.tw/handle/20298859671944667688.
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碩士國立屏東教育大學
視覺藝術教育學系
94
This research includes case study and document analysis, in an attempt to search for creative elements from nativist nostalgia and thoughts. The purpose is to examine the theme of personal creativity from the meaning of living esthetics. Painting is a plastic art, which is a concrete presentation completely and substantially delivering the ideas, feelings, and concepts of an artist’s life and experiences of nature with artistic skill. After the middle of 19th century, the social-realism style based on real life had been gradually developed as an art theme in the west which honestly reflected the situation of the lower classes. It transferred sympathy for one’s fellow humans and the dedicated respect for working people into a celebration, with such motifs and styles of realism taken real life directly or indirectly blended into paintings by artists. The author is trying to search for creative style from personal life images based on a nativist complex, choosing “Mrs. Oyster” as the topic to express the concerns of nativist humanism. It further reflects the meaning of living esthetics by fashioning creative space from practical subjects in daily life. The six pieces of the “Mrs. Oyster” series express: (1) the yearning for home and its natural concern for community, (2) a witness of social mobility and an expression of nostalgia for the countryside, (3) a reflection of the living memories and feelings of the artist, (4) the illustration of caring for society; with feelings have turned into an eternal “living esthetic” of truth, goodness, and beauty that transcends time and space and mundane concerns practical interests. The creations of the “Mrs. Oyster” series are a record of individual intuition and experience, which match the symbols of Taiwan humanity and have become an art theme worthy of continuing study and research. From this theme it is hoped to build a personal creative style and start a new personal life experience to paint the sights of life and living.
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Armstrong, Deborah, Emily Charlesworth, Alison J. Alderson und David B. Elliott. „Is there a link between dizziness and vision? A systematic review“. 2016. http://hdl.handle.net/10454/8710.
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YesPurpose: The aim of this study was to systematically review the literature to investigate the link (if any) between vision and dizziness. Methods: Medline, CINAHL, AMED, Web of Science and The Cochrane Library were searched with keywords chosen to find articles which investigated the causes of dizziness and considered vision as a possible trigger. Citation chaining of all included papers was performed in addition to the hand searching of all reference lists. Unpublished literature was identified using www.opengrey.eu. The review considered studies involving adults which link, measure or attempt to improve any aspect of vision in relation to dizziness. Results: Nine thousand six hundred and eighty one possible references were found, and the abstracts were screened independently by two reviewers to determine if they should be included in the study. Thirteen papers were found which investigated whether dizziness was linked to an assessment of vision. Visual impairment measures were crude and typically self-report, or Snellen visual acuity with little or no measurement details. Five studies found an independent link between dizziness and vision, five found a weak association (typically finding a link when univariate analyses were used, but not when multivariate analyses were used), and three found no association. Studies finding a strong link were usually cross-sectional with a large study population whereas those finding a weak association had relatively small numbers of participants. Studies which did not find an association used a broad definition of dizziness that included the term light-headedness, an unreliable Rosenbaum near visual acuity chart or an unusual categorisation of visual acuity. Conclusions: This review suggests that dizziness (although likely not ‘light-headedness’) is linked with poor vision although further studies using more appropriate measures of vision are recommended.
Deborah Armstrong was funded by a College of Optometrists Research Scholarship and Emily Charlesworth by a College of Optometrists summer studentship.
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Almeida, Tiago Miguel Rodrigues de. „Multi-camera and multi-algorithm architecture for visual perception onboard the ATLASCAR2“. Master's thesis, 2019. http://hdl.handle.net/10773/29133.
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Road detection is a crucial concern in Autonomous Navigation and Driving Assistance. Despite the multiple existing algorithms to detect the road, the literature does not offer a single effective algorithm for all situations. A global more robust set-up would count on multiple distinct algorithms running in parallel, or even from multiple cameras. Then, all these algorithms’ outputs should be merged or combined to produce a more robust and informed detection of the road lane, so that it works in more situations than each algorithm by itself. This dissertation integrated in the ATLAS-CAR2 project, developed at the University of Aveiro, proposes a ROS-based architecture to manage and combine multiple sources of lane detection algorithms ranging from the algorithms that return the spatial localization of the road lane lines and those whose results are the navigable zone represented as a polygon. The architecture is fully scalable and has proved to be a valuable tool to test and parametrise individual algorithms. The combination of the algorithms’ results used in this work uses a confidence based merging of individual detections.A deteção de estradas é uma questão crucial na Navegação Autónoma e na Assistência à Condução. Apesar de os múltiplos algoritmos existentes para detetar a estrada, a literatura não oferece um único algoritmo eficaz para todas as situações. Uma configuração global mais robusta incorporaria vários algoritmos distintos e executados em paralelo, ou mesmo baseado em múltiplas câmaras. Então, todos os resultados destes algoritmos devem ser fundidos ou combinados para produzir uma deteção mais robusta e informada da via da estrada, para que funcione em mais situações do que cada algoritmo funcionando individualmente. Esta dissertação integrada no projeto ATLASCAR2, desenvolvido na Universidade de Aveiro, propõe uma arquitetura baseada em ROS para gerir e combinar múltiplas fontes de algoritmos de deteção de vias da estrada, desde algoritmos que devolvem a localização espacial da faixa de rodagem até àqueles cujos resultados são a zona navegável representada como um polı́gono. A arquitetura é totalmente escalável e provou ser uma ferramenta valiosa para testar e parametrizar algoritmos individuais. A combinação dos resultados dos algoritmos utilizados neste trabalho utiliza uma combinação de deteções individuais baseada na confiança.
Mestrado em Engenharia Mecânica
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Simões, José Tiago da Cunha Botelho. „Implementação do Standard Work e outras ferramentas Lean Production numa empresa de máquinas-ferramentas“. Master's thesis, 2013. http://hdl.handle.net/1822/25668.
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Dissertação de mestrado integrado em Engenharia e Gestão IndustrialEste projeto de dissertação, inserido no plano de estudos do curso do Mestrado Integrado em Engenharia e Gestão Industrial da Universidade do Minho, do 5º ano, foi realizado em ambiente industrial na empresa de máquinas-ferramentas Adira SA. Este projeto teve como principal objetivo implementar algumas ferramentas Lean Production, focando essencialmente a implementação do Standard Work. Outro objetivo desta dissertação foi a preparação do processo de implementação de uma linha de montagem de produtos misturados (guinadora) numa outra unidade produtiva da empresa. Estes dois objetivos foram integrados para melhorar o desempenho da empresa do sistema de montagem de produtos (guilhotinas e quinadoras). A metodologia de investigação utilizada foi a Action Research. Assim, iniciou-se a investigação com uma revisão bibliográfica sobre Lean, a sua origem, os princípios e alguma das suas ferramentas. Nesta revisão também se reviram algumas implantações dos sistemas produtivos, apresentando alguns casos de reconfiguração do sistema de produção. Posteriormente, fez-se o diagnóstico ao sistema de produção da empresa, através da apresentação e caracterização deste e dos seus produtos. Identificados os produtos a estudar pela empresa, foi então analisado o sistema de montagem desses produtos. Esta análise permitiu tirar várias ilações quanto às medidas de desempenho, às competências dos operadores e aos desperdícios existentes neste sistema. Após o levantamento dos problemas, foram identificadas algumas propostas para os solucionar. Sem nunca esquecer a ideologia do Lean “doing more with less”, a maioria das propostas não acarretaria custos significativos para a empresa quando implementadas na linha de montagem de produtos misturados (guinadora). Em relação a resultados estimados, foram obtidos valores positivos tanto em relação ao aumento da produção, onde se prevê um aumento de 72 guilhotinas para 112 guilhotinas e de 144 quinadoras para 186 quinadoras, como na diminuição no tempo de produção de 45% e 40% para as guilhotinas e quinadoras, respetivamente, reduzindo o número de operadores na secção de montagem de 10 para 8.
This dissertation project inserted in the course of Integrated Masters in Industrial Engineering and Management, University of Minho 5th grade was performed in an industrial environment in a company of machine tools. This project aimed to implement some Lean Production tools, focusing essentially on implementation of Standard Work. Another objective of this work was the preparation of the implementation process of an mixed assembly line of blended products (guinadora) in another production unit of the company. These two goals have been integrated to improve the performance of the company’s mounting system products (press brakes and guillotine shears). The research methodology used was the Action Research. Thus, the research began with a literature review on Lean, its origin, the principles and some of its tools. This review also revised certain deployments of production systems, with some cases of reconfiguration of the production system. Subsequently, the diagnosis was made to the production system of the company through the presentation and characterization of this and its products. Products identified by studying company was then analyzed the mounting system for these products. This analysis allowed us to draw several conclusions regarding the performance measures, the skills of the operators and the waste exist in this system. After identified the problems, some proposals to solve them were presented. Never forgetting the ideology of Lean "doing more with less" most proposals do not entail significant costs for the company when implemented in mixed assembly line products (guinadora). Regarding the estimated results were obtained positive values both in relation to increased production which provide an increase of 72 to 112 guillotine shears and press brakes 144 to 186 press brakes as well as a decrease in production time by 45% and 40% for press brakes and shears, respectively, reducing the number of operators in the assembly section from 10 to 8.
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YANG, CHEN-HUAN, und 楊承寰. „Some moments existing in some spaces:Reconstruction of forgotten time and space through the emotional link of art visual statement“. Thesis, 2016. http://ndltd.ncl.edu.tw/handle/79547174978814582382.
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碩士實踐大學
時尚與媒體設計研究所
104
During the days at work, leaving home early and returning late day by day, I felt a lack of my own will out of a feeling of retriction and overwhelming environment, being reprssed and numb. It is just like Sisyphus in Greek mythology, who was punished and had to roll a boulder up a hill for eternity, for him it is in the end futile and helpless. The numbness I felt in life made me have doubt in the existence and wondered if I were shaped by merely work. Yet out of my anxious mind I was urge to find a way out. The mythology of Sisyphus became the origin of my creation. Same roads I was accustomed to are just like the boulder that was rolled repeatedly. Nevertheless, when I changed my thinking and extented my observation and imagination, I found new perspectives in those things around me that I thought I was accustomed to. The whole process and the new findings led me to think of certain moments in the past and to unlid the memories that were long sealed. During the process of observation, the feeling of numbness for work became a feeling of sentiment for the time passed. However, I became to adapt a different thought while thinking of the film 'Interstellar'. Originally, I thought the passed time was never again retrievable. Yet in 'Interstellar' the concept of a fifth dimension is mentioned, with which the image of the past could be recurred. Once the dimension is opened, the image in the past could be scanned while hauling among timeline as it were a vedio-playing program. The series of creation if me practicing the dimension with my imagination by retrieving the time passed via every paintings. All these paintings are a reminder that the past is never gone.
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Jansen, Jessica Mary-Ann. „Exploring the teaching of Grade 1–3 English spelling using the Sound Reading System : a case of a Namibian primary school“. Diss., 2017. http://hdl.handle.net/10500/22715.
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Exploring the teaching of Grade 1 – 3 English spelling using the Sound Reading System: A case of a Namibian primary school
Spelling is crucial for literacy development in children and therefore needs to be taught effectively during the primary grades. A plethora of studies on spelling instruction have been carried out to shed light on the importance of applying scientifically based methods. This study investigated the implementation of the Sound Reading System (SRS) for teaching spelling in Grades 1, 2 and 3 in Namibia – a country where English is mostly acquired as a taught subject. A qualitative design was used to examine the application of the SRS in whole-class instruction in the Erongo region of Namibia. Using observations, interviews and document analysis, data was obtained from one school where the SRS was used to teach spelling. Three teachers were observed and subsequently interviewed on the teaching of English spelling. The findings revealed that, after using the SRS, teachers felt their own alphabetic knowledge had improved and their approach to teaching spelling had changed, leading to an awareness of what meaningful spelling activities entail. They felt that the methodology had provided a systematic approach to their teaching. The teachers were convinced that there is a link between spelling and reading and the methodology provided an opportunity to teach these skills simultaneously.
In terms of the SRS, an integrated approach is applied whereby the target sound becomes the focal point of language development to provide an opportunity for skill transfer. However, the teachers found it challenging to slot in all the activities in a timetable that does not cater specifically for spelling. Another challenge perceived by the teachers was the effective teaching of sight words. This study recommends teamwork between teachers and parents to ensure that all SRS activities are completed successfully at home. Furthermore, it emphasises the importance of applying scientific methods in classroom practice. It further suggests that teaching the full range of spellings in the SRS be continued in Grades 4 and 5 to reinforce a deeper understanding of English orthography. Lastly, it is suggested that higher institutions link teacher training to curricular outcomes.Curriculum and Instructional Studies
M. Ed. (Curriculum Studies)