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Hale, Rebecca O. "POSITION CLASS PRECLUSION: A COMPUTATIONAL RESOLUTION OF MUTUALLY EXCLUSIVE AFFIX POSITIONS." UKnowledge, 2014. http://uknowledge.uky.edu/ltt_etds/3.
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In Paradigm Function Morphology, it is usual to model affix position classes with an ordered sequence of inflectional rule blocks. Each rule block determines how (or whether) a particular affix position is filled. In this model, competition among inflectional rules is assumed to be limited to members of the same rule block; thus, the appearance of an affix in one position cannot be precluded by the appearance of an affix in another position. I present evidence that apparently disconfirms this restriction and suggests that a more general conception of rule competition is necessary. The data appear to imply that an affixation rule may in some cases override a rule introducing an affix occupying another, distinct position. I propose that each inflectional rule R carry two indices — the first, as usual, specifying the position of the affix introduced by R. The second, however, specifies the position(s) that R satisfies. By default, these two indices identify the same position. However, where one affix precludes another, the second index of the appearing affix specifies two affix positions: the one in which it appears and the one which it precludes. With both blocks satisfied, no other rules which fill either may be applied.
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Adamian, Nika. "Predictive position coding : attentional account of motion-induced position shifts." Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCB164/document.
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La localisation des objets dans l'espace est l'une des fonctions centrales du système visuel. Lorsqu'un observateur ou une cible se déplace, le mouvement de l’œil ou de l'objet peut être pris en compte pour calculer la position de l'objet à n'importe quel moment. Il a été démontré à plusieurs reprises que le mouvement visuel peut fortement influencer la position perçue d'un objet. Par exemple, la position d'un stimulus contenant une texture en mouvement (De Valois & De Valois, 1991; Ramachandran & Anstis, 1990), celle d'un flash présenté sur (Cavanagh & Anstis, 2013) ou à côté (Whitney & Cavanagh, 2000) d'une texture en mouvement, et même les positions d'apparition et de disparition d'objets en mouvement (Fröhlich, 1923) sont perçus comme étant déplacées dans le sens du mouvement. Dans le cadre de cette thèse, nous avons exploré la relation entre ces changements de position provoqués par le mouvement et différentes formes d'attention visuelle: 1) l'attention spatiale temporaire, 2) l'attention globale et locale, 3) l'attention spatiale maintenue, et 4) l'attention centrée sur les objets. Dans une première série d'expériences, nous avons étudié dans quelle mesure et de quelle manière l'attention module l'effet Fröhlich (i.e la position perçue du début du mouvement est déplacée dans le sens du mouvement). Dans les expériences 1 et 2, nous avons mesuré l'effet Fröhlich dans différentes conditions de d'indiçage et nous avons montré que les indices non valides ou tardifs entraînent des déplacements perceptifs plus importants. Dans l'expérience 3, nous avons comparé les déplacements provoqués par le mouvement lorsque les sujets portaient leur attention sur un ensemble d'objets en mouvement qui formaient un groupe à quand ils portaient leur attention à un seul stimulus parmi cet ensemble. Les résultats montrent que l'effet Fröhlich n'était présent que lorsque l'attention sélectionne un seul objet et qu'il disparaît lorsque le stimulus est perçu dans un contexte de groupe (global). Ainsi, ces résultats suggèrent que l'attention sélective est à la fois à l'origine de et module l'effet Fröhlich. Ayant établi que les délais temporels de l'attention augmentent les changements de la position provoqués par le mouvement, l'étude suivante était conçue pour explorer si la distribution spatiale de l'attention a le même effet. Dans cette étude, nous avons utilisé le « flash grab » - un changement de position illusoire aperçu quand une cible est brièvement présentée brièvement sur un fond en mouvement au moment de l'inversion du sens du mouvement (Cavanagh & Anstis, 2013). Les essais étaient regroupés en différents blocks au début desquels un indice indiquait la région de l'espace dans laquelle la cible était susceptible d'apparaître. Nos résultats mettent en évidence une diminution du flash-grab quand la distribution spatiale des cibles était limitée à une plage de 90° ou moins. Dans la dernière étude, nous nous sommes demandés si l'effet du mouvement sur la position perçue affecte l'objet dans son ensemble ou si il affecte les caractéristiques distinctes d'un même objet indépendamment les uns des autres. Pour cela nous avons utilisé le paradigme flash grab en présentant brièvement une forme sur un fond en mouvement au moment de l'inversion du sens du mouvement. Les résultats indiquent que les attributs de la cible orthogonaux au mouvement du fond étaient déplacés, alors que les attributs parallèles au mouvement restaient intacts. Ceci suggère que le mouvement interagit avec la position des attributs de l'objet (et que l'attention focale sélectionne) avant que ces attributs ne soient regroupés en un objet. En conclusion, nous avons utilisé une variété de manipulations attentionnelles à des changements de position provoqués par le mouvement pour étudier le lien entre l'amplitude de l'illusion et les caractéristiques attentionnelles utilisé<br>Localizing objects in space is one of the central functions of the visual system. When an observer or a target is moving, the motion of the eye or the object can be taken into account to compute the current object locations. It has been shown many times that visual motion can strongly influence the perceived position of an object. For example, a stationary patch containing moving texture (De Valois & De Valois, 199; Ramachandran & Anstis, 1990), a flash presented on (Cavanagh & Anstis, 2013) or next to (Whitney & Cavanagh, 2000) a moving texture, and even the onset and offset positions of the moving targets (Fröhlich, 1923) are perceived as shifted in the direction of motion. In this thesis we explore the relationship between these motion-induced position shifts and visual attention in the following forms: 1) transient spatial attention, 2) global and local attention, 3) sustained spatial attention, and 4) object-based attention. In the first series of experiments we looked at whether and how attention modulates the shift in localization of motion onset (Fröhlich effect). In Experiments 1 and 2 we measured Fröhlich effect under different cueing conditions and established that invalid or late cues produced larger perceptual shifts. In Experiment 3 we compare the motion-induced shifts when the subjects attended to a set of moving stimuli as a group and when they attended to an orientation singleton. We showed that the Fröhlich effect was only present when the target was individuated and disappeared when the stimulus was perceived globally. Thus, the Fröhlich effect appeared to be both produced and modulated by focal attention. Having established that temporal delays of attention increase motion-induced position shifts, the next study explored if spatial distribution of attention has a similar effect. In this study we used flash grab - an illusory position shift seen when a target is briefly flashed on top of a moving background that abruptly changes direction (Cavanagh & Anstis, 2013). Trials were presented in blocks and before each block a cue indicated a range of possible target locations. We found that the flash grab was reduced if the spatial distribution of targets was limited to a range of 90° or less. The final study asked whether motion shifts the perceived position of an object as a whole or if separate features of a single object are shifted independently. To test this we used the flash grab paradigm and briefly presented a shape on top of a moving background at the moment it changed direction. The results showed that the features of the target that were orthogonal to the background motion were shifted, whereas the features parallel to the motion were intact. This suggests that motion interacts with the position of the object's features (and focal attention selects them) before they are bound together into an object. In conclusion, we applied a variety of attentional manipulations to motion-induced position shifts, and examined the link between the strength of the illusion and the characteristics of attention used in a particular task. We found that 1) motion-induced position shifts require focused attention and the possibility to track an individual motion trajectory; 2) allowing attention to be allocated more efficiently in space reduces the illusion; and 3) motion-induced shifts operate on the feature-based and not object-based level
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Håkansson, Pontus, and David Knutsson. "Safe Sleeping Position." Thesis, Halmstad University, School of Business and Engineering (SET), 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-750.
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<p>Project Safe Sleeping Position (SSP) contains all parts in a product development phase. The project comprises the whole cycle from idea to a complete product where all aspects are included. The scope is to develop an innovative solution for a common known problem and work with all parts within the man-machine-way. The result is an inflatable product which secures a child in the correct way for the seatbelt to work properly in the rearseat of a car. Ergonomics, technical extent, usability, design, construction, product solutions and market potential are some of all parts witch the project includes. The targetgroup for the project is children 4 to 12 years old, but there is a great potential for a further development to provide a solution for adults. </p><p>Signed project managers are commissioned by Volvo Car Corporation (VCC), a large car manufacturer with the whole world as the market. This sets requirements to the product to be adaptable to all markets without cutting down on usability. Except the assigner, the project comprises several partners, both companies, independent organizations and students at Halmstad University.</p>
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Joris, Hannah. "Our vulnerable position." Thesis, Konstfack, Ädellab/Metallformgivning, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:konstfack:diva-3228.
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Today outer –often opposing- influences are endless; varying from contact with group features such as cultural, economical, national distinctions to differences in individual religious beliefs, sexual behavior, political views, ecological consciousness, etc. … Being confronted with this otherness leads to a crumbling, an unsettling notion of the known, the established values which throughout time were thought to have become one’s own; leading to confusion and resulting in the questioning of the self. A learning and growing process which does not become easier with all the changes in our contemporary Western society… How do we, contemporary Western human beings deal with the apparent freedom and insecurity we are confronted with in our society?The essay starts off by looking at some of the major shifts in our contemporary society. A first important change is the space-time compression. The consequences of this shift, such as the dissolving of nations, hybridizing of national identities, globalization and theuncertainty it brings forth, are explored from different angles.Fast-moving trends have caused a confusion of beliefs and identities and as there is not one principle provided, one has to learn to grasp the contrasts. Today there is a taste for heterogeneity, causing a shift towards openness, inclusion and tolerance. Even though it is on its dispositions that contemporary society thrives, it also means that opposing extremes exist next to one another.In our ‘information society’ innovation of communication and knowledge occupy a significant role. Besides the confusion caused through the space-time compression, all truly transformative advances in knowledge bring along the downside of uncertainty and incalculability.Along with these ‘sources for uncertainty’, there is also a short look into possible certainties in contemporary life, since traditional religions and modern substitutes are not satisfactory and a strong belief in anything today seems rather improbable.A possible source for answers and improvements which is given are the humanities. They confront people with making judgments about the relationship between facts and values.It is important in creating awareness in an ‘information society’ since innovations are value-free. Humanities can have the ambition to bring people towards each other to take up new forms of identification that are open for collaboration and unity.
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Rau, Alexander V. "Relative-position localization." Thesis, University of Oxford, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.403983.
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Pfajfer, Aleksander. "Position-dependent encoding." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/36461.
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Morris, Eric M. "The Tornado Position." University of Akron / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=akron1279143567.
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Wagner, Claude. "L'ergothérapie dans le champ des professions paramédicales : positions, prises de position et représentations." Metz, 2004. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/2004/Wagner.Claude.LMZ0405.pdf.
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Notre démarche consiste à prendre pour objet d'étude la profession d'ergothérapeute. Celle-ci peut être inscrite dans un champ professionnel plus vaste où existent des enjeux de légitimation et de reconnaissance. Profession paramédicale de la rééducation et de la réadaptation elle implique une formation de trois ans dans des écoles spécialisées sanctionnée par un diplôme d'Etat en ergothérapie. En effet, l'Etat en tant qu'administration est le vecteur premier de légitimation de cette profession, il lui reconnaît la maîtrise d'une technique formalisée dans le décret d'actes. Détenteur d'une qualification, d'une compétence technique spécifique l'ergothérapeute est toutefois subordonné à l'autorité du médecin prescripteur. En cela, dans le cadre de la division du travail médical, l'ergothérapie tient une place " d'intermédiaire " à l'identique des kinésithérapeutes ou des psychomotriciens, par exemple. Dans ces conditions une profession comme l'ergothérapie peut-elle jouir d'un certain degré d'autonomie ? Au sein des professions paramédicales et du monde médical en général les ergothérapeutes ont justement des difficultés à se positionner parce que les savoirs qui fondent la profession émanent de plusieurs disciplines (médecine, psychologie, techniques d'appareillage, ergonomie,). De plus, leurs domaines d'intervention ne sont pas toujours connus des médecins praticiens, des autres professions paramédicales et du grand public en général. Ainsi, la reconnaissance d'une profession telle que l'ergothérapie dépend en grande partie de la capacité des membres qui la composent à mettre en valeur leurs compétences auprès du corps médical, des patients ainsi qu'auprès de l'administration<br>Occupational therapy in the paramedical field: positions, stand points, perceptions. Our reasoning consists in studying the trade of occupational therapists. This profession can be included in a professional field in which legitimacy and recognition are at stake. Occupational therapy is a profession of reeducation and rehabilitation, that supposes a three-year training in special schools and for which a state degree is delivered. Indeed the state validates the professional qualification of occupational therapists through the decree of competences. However, the therapy performed by the occupational therapists has to be (taken) in accordance with medical doctor instruction. So, in the medical work division the place of the occupational therapist is in the middleman like the physiotherapist or the psychomotrician for instance. In these conditions can the occupational therapists get autonomy to a certain extent? Among the medical world in general the occupational therapists have difficulties to find a place because the knowledge on which is based the profession stems from many areas (medicine, psychology, ergonomics, ). In addition to that, all the areas covered by occupational therapists are not always known by the general practitioners, the others paramedical professions and people in general. So the recognition of the trade like the occupational therapists depends in great part on ability on his members to emphasize their expertise among the medical body, the patients and the administration
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Wagner, Claude Trépos Jean-Yves. "L'ergothérapie dans le champ des professions paramédicales positions, prises de position et représentations /." Metz : Université Metz, 2008. ftp://ftp.scd.univ-metz.fr/pub/Theses/2004/Wagner.Claude.LMZ0405.pdf.
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Lu, Yun Ran. "Position mobile phone market." Thesis, University of Macau, 2000. http://umaclib3.umac.mo/record=b1636664.
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Andersson, Mathilda, and Martina Popovska. "Revisorns position och identitet." Thesis, Linnéuniversitetet, Institutionen för ekonomistyrning och logistik (ELO), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-27126.
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Inledning: Vilken position en revisor innehar kan bero på ett flertal faktorer. Bland annat styrs revisorns position av revisionsbyråns krav och demografi. Revisorns identitet är också något som kan påverkas av en rad olika faktorer, vilka skapar incitament för att revisorn identifierar sig med revisionsbyrån, klientföretaget eller professionen. Då det även har visat sig att relationer inom revisionsbyrån, klientföretaget eller professionen kan påverka revisorns position, är det då möjligt att det finns en samvariation mellan revisorns identitet och position? Problemformulering: Vilka faktorer påverkar revisorns position och identitet? Hur samvarierar revisorns identitet och uppnådda position? Syfte Syftet med denna uppsats är att förklara vilka faktorer som påverkar revisorns position och dess identitet samt hur revisorns identitet och position samvarierar. Metod: I denna studie har vi antagit en deduktiv forskningsansats, där vi har lyft fram existerande teorier om revisorns position och identitet. Vi har med hjälp av dessa kunnat finna faktorer som kan påverka revisorns position och identitet samt att det finns en samvariation mellan revisorns identitet och position. Därefter genomfördes en kvantitativ undersökning där webbaserade enkäter sändes ut till godkända och auktoriserade revisorer i Sverige. Resultat och slutsats: Resultaten av vår studie säger att faktorerna övertidsarbete, nya klienter och revisionsbyråns storlek påverkar revisorns position. Vi har även funnit en samvariation mellan identitet och position, vilken säger att identifiering med professionen är negativt relaterat till revisorns position. Vi har däremot inte kunnat finna några faktorer som påverkar revisorns identitet.
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Chiang, Chi-Ting. "Position-dependent power spectrum." Diss., Ludwig-Maximilians-Universität München, 2015. http://nbn-resolving.de/urn:nbn:de:bvb:19-183996.
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Truman, Andrew. "Position-sensitive scintillation counters." Thesis, University of Southampton, 1996. https://eprints.soton.ac.uk/399480/.
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Lau, K. S. "Position controlled disc valve." Thesis, University of Surrey, 1987. http://epubs.surrey.ac.uk/847625/.
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Recent developments of electro-hydraulic disc valves at Surrey University have shown that with a careful balance between the hydraulic and magnetic forces, this type of valve can be used as a digital or proportional device. As the valve is simpler in construction and involves very few critical dimension compared with a servo-valve, the sensitivity to contamination is considerably reduced. The dynamic response of the valve is fast due to utilising high electro-magnetic and fluid forces for actuation. The research described in this thesis is an extension of earlier work by Yuksel and Usman to improve electro-hydraulic disc valves by applying closed-loop position or pressure control to the disc. From an investigation of an unbalanced single disc valve, it was found that using position feedback can help to stabilise the disc under varying load conditions. A special differential capacitive transducer to measure the disc position was designed and constructed and was found to perform satisfactorily. As the pressure-flow characteristic of the valve can be varied by controlling the disc position, the function of the valve is similar to an electrically controlled variable orifice. Various modular configurations are proposed to perform more complicated control functions. In the final part of the research, a double disc valve is described for used in an application study to control the damping characteristic of a modified vehicle shock absorber. Initially, the valve was designed for closed-loop position control due to the non-linear hydraulic and magnetic forces. Results show that the valve can be controlled to generate the required range of damping force and has adequate dynamic performance with a response time in the range of 10 to 30 msec. However, tests using direct pressure control were also carried out. Preliminary results indicate that pressure feedback is preferable to position feedback and that by using lead compensation together with a proportional plus integral controller, stable operation is possible.
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Marquet, Bernard. "Electrofluoration en position benzylique." Lyon 1, 1990. http://www.theses.fr/1990LYO10196.
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L'oxydation anodique de derives benzyliques fonctionnalises dans cette position par un groupement electro-attracteur (carbonyle, nitrile, sulfonate) dans l'acetonitrile en presence de trihydrofluorure de triethylamine permet d'introduire un atome de fluor sur le chainon benzylique, via un mecanisme transitant par un carbocation destabilise. En serie paramethoxylee, les mono et les difluorures benzyliques sont obtenus avec de bons rendements quel que soit le groupement electro-attracteur. Pour les autres structures, la formation concurrentielle d'acetamide, ainsi qu'une fluoration du noyau aromatique sont observees. L'utilisation du sulfolane comme solvant en remplacement de l'acetonitrile permet d'eviter l'acetamidation. La fluoration de derives paramethyles a ete egalement etudiee. Elle conduit a une fonctionnalisation regioselective de ces composes. Les principaux facteurs responsables de cette regioselectivite ont ete examines
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Rastogi, Ravi. "POSITION CONCORDANT - HAPTIC MOUSE." VCU Scholars Compass, 2009. http://scholarscompass.vcu.edu/etd/1699.
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Haptic mice, computer mice modified to have a tactile display, have been developed to enable access to computer graphics by individuals who are blind or visually impaired. Although these haptic mice are potentially very helpful and have been frequently used by the research community, there are some fundamental problems with the mouse, limiting its acceptance. In this paper we have identified the problems and have suggested solutions using one haptic mouse, the VT Player. We found that our modified VT Player showed significant improvement both in terms of the odds of obtaining a correct responses and the time to perform the tasks.
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Hultman, Mikael. "For Position Only Studio." Thesis, Konstfack, Grafisk design & illustration, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:konstfack:diva-6855.
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FPO Studio is based in Stockholm, Sweden. The structure was founded in 1996. We work for clients in both cultural and commercial fields with a focus on editorial design, communication concepts, brand identity, graphic production as well as website design and development. FPO offer a complete range of services that can be applied to all communication media. We manage to carry out your projects through an expanding network of specialized experts in a vast range of services. For more than 20 years, we have built our profile and maintained high skills and knowledge in terms of visual conception, graphic design, production and Art Direction.
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FREVILLE-HERENTHALS, STEPHANIE. "Synthese enantioselective d'alcaloides monosubstitues en position 2 et disubstitues en positions 2 et 6." Paris 6, 1996. http://www.theses.fr/1996PA066557.
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La these presentee porte sur l'elaboration de nouvelles syntheses enantioselectives d'alcaloides piperidiniques monosubstitues en position 2 et disubstitues en positions 2 et 6. Le travail a pour point de depart un substrat bicyclique oxazolopiperidonique, lui-meme issu de la condensation du phenylglycinol et d'un -cetoacide dont une nouvelle methode de preparation a ete developpee. Ce bicycle possede en et de l'atome d'azote des reactivites potentielles: fonction carbonyle du lactame et fonction iminium aminal masquee. Une ouverture stereoelectronique en (cycle oxazolidinique) conduit aux lactames n-proteges. Trois voies sont alors envisagees: la premiere donne acces aux 2-alkylpiperidines apres une reaction d'extrusion d'oxygene et une elimination de la partie chirale. La deuxieme conduit aux lactames chiraux par debenzylation. Ces derniers sont des synthons-cles permettant l'acces direct aux 2-alkylpiperidines apres une reaction d'extrusion d'oxygene et aux 2,6-dialkylpiperidines trans ou cis par une suite de reactions stereoselectives effectuee en de la fonction carbonyle. Une inversion de configuration du carbone portant la fonction hydroxyle de l'un de ces derives conduit au (-)-pinidinol. C'est la premiere synthese enantioselective de ce compose. La derniere voie conduit aux oxazolopiperidines par action d'organomagnesiens sur la fonction carbonyle du lactame. L'ouverture ulterieure du cycle oxazolopiperidinique et la debenzylation conduisent stereoselectivement aux 2,6-dialkylpiperidines trans. La plupart des composes obtenus sont des produits naturels et presentent un interet biologique
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Klaszky, Robert A. "Analysis of the positional accuracy of a range difference missile position measuring system." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2000. http://handle.dtic.mil/100.2/ADA384866.
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Thesis (M.S. in Systems Engineering) Naval Postgraduate School, Sept. 2000.<br>"September 2000." Thesis advisor(s): Schleher, D. Curtis. Includes bibliographical references (p. 105). Also available online.
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Treu, Georg. "Position-Management für ortsbezogene Community-Dienste : effiziente Position-Update-Methoden und Betrachtungen zum Datenschutz /." Saarbrücken : VDM Verlag Dr. Müller, 2008. http://d-nb.info/988615754/04.
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Dretvik, Trond Michael. "The effect of strength and absolute load on position variability in isometric position tasks." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for bevegelsesvitenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-17482.
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The purpose of this study was to investigate the relationship between strength and position control, with an emphasis on measurements at low, absolute levels of force, as well as to examine the effect of load on position control. 33 healthy and physically active male university students were subjected to maximum voluntary contraction (MVC) tests and a weighted positional knee extension task involving trials at force levels ranging from 0.5-20kg, with the goal of maintaining position. Among the principal findings was the fact that strength did not affect position variability at lower levels of force, while at higher force levels, the stronger subjects exhibited lower levels of position variability. Thus, it was concluded that general strength training up to a certain level is non-detrimental to force control at low levels of resistance, and that increases in strength may contribute positively to force control at moderate force levels. In accordance with previous research, variability increased as a function of load, while variability relative to load decreased with added weight. At the heaviest weights, strength became the main determinant of performance, while its importance at lower force levels was negligible. Mean and maximum frequency of velocity and acceleration exhibited a U-shaped relationship with weight, which at the lower end was attributed in part to an inability to perceive and correct for the small force oscillations, as well as low inertia.
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Makepeace, Lester Brown. "Theoretical basis for state vector comparison, relative position display, and relative position/rendezvous prediction." Thesis, Monterey, California. Naval Postgraduate School, 1993. http://hdl.handle.net/10945/27307.
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This thesis outlines the theoretical underpinnings used for the software designed to meet Detailed Technical Objectives 700-6 and 700-7 for the Space Shuttle Discovery mission STS-5 1. The primary goal was to compare state vector information produced by an on board GPS receiver and Discovery's computers, and provide real time display of the results. Because state vector information for the ORFEUS/SPAS payload was also available, relative position and rendezvous information between Discovery and ORFEUS/SPAS was made possible. Analysis of the various state vectors was used to produce a graphical display, in an operationally meaningful format, to the flight crew of Discovery
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Treu, Georg. "Position-Management für ortsbezogene Community-Dienste effiziente Position-Update-Methoden und Betrachtungen zum Datenschutz." Saarbrücken VDM Verlag Dr. Müller, 2007. http://d-nb.info/988615754/04.
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Berntsen, Per Ivar Barth. "Structural reliability based position mooring." Doctoral thesis, Norwegian University of Science and Technology, Department of Marine Technology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-2134.
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<p>This thesis considers control of moored marine structures, referred to as position mooring. Moored marine structures can take on a number of different forms, and two applications are considered in this work, namely aquacultural farms and petroleum producing vessels. It is anticipated that future aquacultural farms will be significantly larger than the existing ones, and placed in much more exposed areas. Hence, there is a significant technology transfer potential between the two seemingly different fields of aquaculture and petroleum exploitation.</p><p>Today’s implemented state of the art positioning controllers use predetermined safety regions and gain-scheduling for evaluating the necessary thruster force for the vessel to operate safely. This represents a suboptimal solution; the operator is given a significant number of variables to consider, and the thrusters are run more than necessary. Also, it is likely that a more conservative controller regime does not necessarily increase the overall reliability of the structure as compared with a less conservative but better designed controller.</p><p>Motivated by this, a new control methodology and strategy for position mooring is developed. Two controllers using information about the reliability of the mooring system are implemented and tested, both via numerical simulations and model scale experiments. The first controller developed uses a reliability criterion based on the tension in the mooring system as a pretuning device. A nonlinear function based on the energy contained by the system is included in the controller to ensure that the thrusters are run only when needed. The controller is an output-feedback controller, based on measurement of position and estimated values of the velocities and slowly varying environmental loads. The second controller developed contains the reliability criterion intrinsically, thus, less pretuning is needed. The backstepping technique is applied during the design process, and the controller has global asymptotical stability properties.</p>
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Tooth, Richard James Economics Australian School of Business UNSW. "Relative position and saving behaviour." Awarded by:University of New South Wales. School of Economics, 2006. http://handle.unsw.edu.au/1959.4/24958.
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There appears to be a growing recognition among economists and other social commentators that people attempt to enhance their relative position (which is commonly described as status) through consumption choices and other behaviour. It has been less common to consider whether attempts to enhance relative position impact on saving behaviour. This thesis makes a number of contributions relating to the impact of relative position on saving behaviour. In this thesis I: - consider why concern for relative position may impact on saving behaviour. I demonstrate, with a simple intertemporal model the surprising result that when people are concerned with relative position, income risk can lead to most people saving less and the rich saving more. - conduct an empirical study to test the importance of relative position on saving behaviour. I find a statistically and economically significant relationship between peer income and saving behaviour consistent with theories that people actively forgo saving to seek to enhance their relative position. I use the data to demonstrate that relative position can help to explain why prior research has consistently found that the rich have higher saving rates. - consider the policy implications of relative position to saving behaviour. I examine the policies, primarily corrective taxation, that have been advocated to address externalities of relative position in a static setting. I find that there are significant issues when these policies are considered in an intertemporal setting. I examine the policy of mandatory saving in addressing distortions caused by relative position and the possibility that concern for relative position improves the effectiveness of mandatory saving policy.
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Mahoney, Richard M. "Human target-directed position control." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320154.
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Bant, Elise. "The change of position defence." Thesis, University of Oxford, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.479399.
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Gowdy, Stephen J. "Position sensitive detectors in GaAs." Thesis, University of Glasgow, 1987. http://theses.gla.ac.uk/1625/.
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Presented in this thesis is a summary of the development of gallium arsenide position sensitive detectors. These are aimed at various applications with the original motivation being experimental particle physics. An account is given of basic semiconductor physics relevant to particle detectors. A review of electronics applicable to reading out charged signals from semiconductor detectors is included. Applications of gallium arsenide X-ray detectors are described together with results from a Monte-Carlo simulation of the spectrum obtained from an X-ray source. The design, fabrication and laboratory testing of detectors is presented for pixel and microstrip detectors and other test structures. Test beam results are also presneted for pixel and microstrip detectors. An introduction to ATLAS detector simulation is also given, with examples of detector descriptions for the GaAs Forward Semiconductor Tracker. Results from a generator level study of b-jets from the process Hbb and predictions of influences in the Forward Tracker are also given.
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Johnston, David John. "Position sensing and augmented reality." Thesis, University of Essex, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.402787.
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Araújo, Filipe. "Position-Based Distributed Hash Tables." Doctoral thesis, Department of Informatics, University of Lisbon, 2006. http://hdl.handle.net/10451/14297.
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In this thesis we want to create scalable, fault-tolerant and self-configuring dictionaries that can be deployed in a wide range of networks, including highly dynamic networks with frequent membership changes, like peer-to-peer overlay networks or wireless ad hoc networks. In recent years, distributed hash tables (DHTs) have emerged as a solution to implement large-scale dictionaries. However, given the existing bandwidth limitations, updating routing information in DHTs remains a challenge. Position-based routing schemes arise as an attractive solution to this problem, due to inexpensive and ubiquitous localization mechanisms. Positional information enables the creation of oblivious (or memoryless) routing schemes, where the coordinates of the current forwarding node, of its neighbors and of the destination, suffice to determine the next hop. Such routing schemes are very suitable to rapidly changing networks, because they require very little control information. We argue in this thesis that we can use positional information to efficiently support routing and DHT operation in wireless ad hoc and in wired networks, whenever position of nodes reflects network topology. To support this claim, we create and evaluate a number of algorithms that simultaneously support routing and DHT operation in both types of networks. % As an interesting result of our work, we can combine solutions into a single architecture that spans wired and wireless networks. This architecture can provide a seamless integration and use of a position-based DHT, despite the access network of the peer nodes
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Witter, Kevin Glenn. "A position on architectural education." Thesis, Virginia Tech, 1990. http://hdl.handle.net/10919/41494.
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PART I
I believe we are products of the age in which we live. Contemporary thinking shapes our historical present and reinterprets our historical past. This world is shaped by many keyhole views. The cornerstones of knowledge are built on a foundation of theory and objective reality. However, the fundamental underpinning of knowledge and theory lies in our perception of reality itself. The old cliche, “you don’t know what you have until you lose it,” is a perspective from which we can evaluate that which preceded as well as the threshold of new thought. A construction of reality is fundamental, yet particular to the temporal context. I propose to explore these issues and their relationship to judgement and decision making processes in design. The approach will be essentially pluralistic.
PART II
The uncertainty of the historical present is coupled with a hope for the future. For many architects the future holds their vision and inspiration. The future is, after all, the horizon we travel toward. Man is now expanding this horizon to space and other planets with alternative environments. Part II will explore architecture as atmosphere, landscape and dwellings through a collection of paintings free of the constraints of existing technology and theory. Architecture must first exist in the mind and heart before it can come into being.<br>Master of Architecture
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Gembris, Heiner. "Zur gegenwärtigen Position der Musikpsychologie." Bärenreiter Verlag, 2000. https://slub.qucosa.de/id/qucosa%3A36651.
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Haislip, Sean Patrick. "The Position of a Chair." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/23865.
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A chair was made of northern white ash wood. Steamed laminates make up each leg, and the spans are solid wood. A bent seat perches on this frame. Drawings, words, and photographs expose the chair in this book. A full exposition of the work can be found in the Art and Architecture Library at the College of Architecture and Urban Studies.<br>Master of Architecture
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Fagan, Gary T. "An experimental investigation into active damage control systems using positive position feedback for AVC." Thesis, Virginia Tech, 1993. http://hdl.handle.net/10919/42624.
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This work discusses the use of Positive Position Feedback (PPF) for Active Vibration
Control as part of an Active Damage Control System (ADCS). Vibration control
increases the fatigue life of a structure and decreases the in-plane stresses that can
cause delamination in a composite. PPF is a collocated direct-output feedback control
method that increases the effective damping in a structure. A simply-supported
beam was used as the testbed which used strain gages as the sensing element and
piezoelectric ceramics as the actuator.</p>
<p>
Initial investigations into sampled-data systems using PPF are presented. The
issues addressed are: stability of the sampled system, the effects of the sampling rate
on the system, and degradation from predicted analog performance. A digital design
procedure for the tuning filters in the Z-plane is suggested if the sampling rate to
be used is known. If the sampling rate varies significantly, to avoid redesigning the
filters for each new sampling rate, they should be designed in the continuous-time
and transformed to the Z-plane. The Tustin transformation was found to adequately
map the poles and zeros of the compensator to the Z-plane for digital control.</p>
<p>
Experimental implementation of PPF on a simply-supported beam resulted in
vibration suppression of three modes with a S180 controller. The beam was subjected
to both a single-frequency harmonic disturbance and a broadband harmonic
disturbance. One, two, and three-mode controllers were designed with disturbance
suppression up to 15dB achieved.</p><br>Master of Science
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Fanson, James L. Caughey Thomas Kirk. "An experimental investigation of vibration suppression in large space structures using positive position feedback /." Diss., Pasadena, Calif. : California Institute of Technology, 1987. http://resolver.caltech.edu/CaltechETD:etd-08112005-104730.
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Elftorp, Kristian. "Abuse of a dominant position : The legal position of tying practices within European Competition Law." Thesis, Jönköping University, JIBS, Commercial Law, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-12245.
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<p>This thesis intends to analyze and clarify the legal position regarding abuse of a dominant position and particularly tying practices. The practice is central within European competition law and has been highly discussed in literature recently. In Article 102 TFEU it is explicitly stated that supplementary obligations which have no connection with the subject of such contracts, shall be considered as a way of abusing a position of strength. Although the method is often reasonable and very common within many business areas, it might be pursued as a tactic of excluding competition. The General Court’s decision in <em>Microsoft </em>led to some confusion as regards to the European approach towards tying practices. Prior to that judgment, the EU Courts appeared quite negative to the practice and seemed determined that the practice was in fact anticompetitive. For an example, in <em>Hilti </em>the Court found it sufficient that the company had deprived its costumers of a choice. The effects on competition were not analyzed in great detail and in most cases the EU Courts fined the undertaking involved in such business methods. However, in <em>Microsoft </em>the General Court took a new approach and focused on the actual effects that followed from the practice. Many argues that European competition law has moved from a <em>per se </em>approach to a <em>rule of reason</em> approach. In my opinion however, it seems relatively unclear whether or not this new approach shall apply to all versions of tying or if it was applied due to the certain circumstances involved in <em>Microsoft</em>. The tying practice involved a form of technical tying, i.e. an integration of two distinctive products. Cases prior to <em>Microsoft </em>mostly concerned a form of contractual tying and were treated very differently by the EU Courts. My opinion on the matter is therefore that it is not possible to declare a clear legal position regarding the practice of tying. There is a need for new judgments and official guidelines since the current situation deprives companies of legal security as concerns the practice of tying within European competition law.</p>
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Medjkane, François. "Position autistique, position psychotique : pour une perspective psychopatologique des troubles envahissants du développement de l'enfant." Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCC087/document.
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A partir d’une expérience clinique pédopsychiatrique réalisée dans le dispositif d’un secteur de psychiatrie infanto juvénile, ce travail tend à expliciter les particularités de fonctionnements psychopathologiques d’enfants présentant un diagnostic de Trouble Envahissant du Développement (TED) tel que décrit dans la Classification Internationale des Maladies de l’Organisation Mondiale de la Santé dans sa 10éme version (CIM10).La réalisation d’une revue de la littérature inscrite dans une perspective historicisante et compréhensive de la construction de l’ensemble nosographique des TED nous a permis de générer l’hypothèse que la position autistique serait corrélée de manière privilégiée aux catégories diagnostiques dénommées TED Autistique et recouvrant les catégories diagnostiques F84.0 d’autisme infantile et F84.5 de syndrome d’Asperger de la CIM 10 et que la position psychotique est corrélée de manière privilégiée aux catégories diagnostiques dénommées TED Non Autistique et recouvrant les catégories diagnostiques F84.1 Autisme atypique et F84.8 Autres TED de la CIM 10.Dans le cadre de ce travail, nous avons pu réaliser une étude rétrospective d’une population clinique d’enfants à partir de données recueillies dans le cadre des évaluations pluridisciplinaires portées par le Centre Ressource Autisme du Nord Pas de Calais.Au vu des éléments analysés dans le cadre de cette recherche, un élément de différenciation possible entre les deux groupes de sujets s’organise autour des capacités de repérage et de la prise en compte des aspects affectifs et émotionnels dans le rapport au Monde. Ce travail, portant sur l’étude de particularités de fonctionnement psychopathologique des enfants présentant un TED, s’inscrit dans le l’objectif de pouvoir contribuer à l’élaboration d’un projet thérapeutique, pédagogique et d’accompagnement personnalisé et le plus ajusté aux besoins mis en évidence<br>From clinical experience of psychiatry practice in a French department for mental health, this work is focused on defining psychopathological specificities which are encountered in children with Pervasive Developmental Disorders (PDD) from described in ICD 10.A literature review from a historical and comprehensive perspective has allowed us to generate a research hypothesis. The autistic position would be correlated with autistic PDD and the psychotic position would be correlated with non-autistic PDD.For this project, we implemented a retrospective study based on a clinical population of children who have been evaluated with standard multidisciplinary assessments, done in the Nord-Pas de Calais’s Centre Resource Autisme.Through different observations, we could support the hypothesis that there is a difference between autistic PDD children and non-autistic PDD children in their affective and emotional relationship with the World.Thanks to this description of psychopathological particularities, this study takes us a step closer to offering each child with PDD the best individual support possible
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OMRANI, MARYAM. "Application of machine learning to remove false positive genomic position in vector insertion site data." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2022. http://hdl.handle.net/10281/357623.
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La terapia genica (GT), il recente approccio per curare malattie genetiche rare ed ereditarie fornendo geni terapeutici in cellule mirate, ha interagito con la bioinformatica e i domini correlati all'analisi dei dati. Nelle applicazioni GT, è richiesto il monitoraggio molecolare del trattamento e sfrutta il sequenziamento di nuova generazione (NGS) per valutare l'efficacia e la sicurezza. Uno degli sforzi principali nell'identificazione dell'IS è mappare milioni di letture sequenziate nel genoma di riferimento. Oggi sono disponibili diversi allineatori per questo scopo. Tuttavia, lo scopo di alcuni lavori è ancora migliorare le prestazioni di rilevamento dell'IS tramite la scelta dell'algoritmo appropriato e testare varie strategie di filtraggio pre/post-allineamento. Poiché nonostante gli attuali miglioramenti nel campo, alcuni fattori come la lunghezza delle letture della sequenza, le regioni ripetute nei genomi di riferimento e gli errori di sequenza riducono l'accuratezza della mappatura. SI falso positivo, è un SI che viene riportato alla fine dell'identificazione SI quando non è presente. Il disallineamento è una delle possibili fonti di False Positive IS.Qui, per risolvere il problema dei False Positive e scartare il rumore nei nostri database clinici di IS, ci siamo prima concentrati sull'allineamento e sul filtraggio post-allineamento. A questo scopo, abbiamo generato una verità di base di letture simulate complessivamente composta da 125.778.685 letture di sequenziamento contenenti un numero totale di 4.333.904 IS e abbiamo provato a testare diversi passaggi della nostra pipeline bioinformatica. Abbiamo confermato che BWA-MEM, l'allineatore ampiamente utilizzato che è anche la scelta di VISPA2, ha buone prestazioni con una precisione del 91%. Ulteriori analisi hanno rivelato che alcune delle misurazioni statistiche come la qualità della mappatura (MAPQ) e il punteggio di allineamento subottimale (XS) riportate per ciascun risultato della mappatura non sono ben correlate con l'accuratezza dell'allineamento. Pertanto, i passaggi di filtraggio dopo l'allineamento potrebbero portare a scartare molte letture senza migliorare la precisione. L'eliminazione delle letture allineate correttamente potrebbe ridurre notevolmente il conteggio delle sequenze. Inoltre, sapendo che l'interazione di diversi fattori come la lunghezza di lettura, gli errori di sequenziamento, l'unicità del genoma di riferimento insieme potrebbero contribuire al risultato dell'allineamento finale, abbiamo proposto un approccio di filtraggio basato sull'albero decisionale. Il nostro risultato ha mostrato che l'algoritmo XGBoost e l'insieme di funzionalità correlate alle letture di sequenze, alle statistiche di allineamento e alle proprietà del genoma con una precisione del 95% è in grado di identificare gli artefatti delle letture sintetiche. Ciò ha suggerito che l'attuale approccio di filtraggio può essere sostituito dal nostro metodo proposto. Nella seconda parte, abbiamo mirato ad assegnare un punteggio di probabilità a ciascun IS da osservare in quella regione genomica. Per raggiungere questo obiettivo, abbiamo sfruttato le note preferenze genomiche del vettore virale e aggiunto nuove caratteristiche genomiche per generare un punteggio di probabilità. I nostri risultati su pazienti GT con due diversi background di malattia hanno mostrato AUROC > 80%. La maggior parte degli IS con punteggio di probabilità basso ha valori bassi per il conteggio delle sequenze e la ricorrenza. Ora stiamo convalidando punti di dati isolati con analisi più specifiche dell'IS.<br>Gene Therapy (GT), the recent approach to cure rare and inherited genetic disorders by delivering therapeutic gene in targeted cells interacted with bioinformatics and data analysis-related domains. In GT applications, the molecular monitoring of the treatment is required and exploits Next generation sequencing (NGS) to assess efficacy and safety. One of the principal efforts in IS identification is mapping millions of sequenced reads to the reference genome. Today, several aligners are available for this aim. However, still improving the IS detection performance by choice of appropriate algorithm and testing various pre-/post-alignment filtering strategies is the scope of some works. Since despite the current improvements in the field, some factors like length of sequence reads, repeat regions in the reference genomes and sequence errors decrease the mapping accuracy. False Positive IS, is an IS that is reported at the end of IS identification when it is not present. Mis-alignment is one of the possible sources for False Positive IS.Here, to solve the problem of False Positive and discarding the noise in our clinical IS databases, we first focused on alignment and post-alignment filtering. For this aim, we generated a ground truth of simulated reads overall composed by 125,778,685 sequencing reads containing a total number of 4,333,904 IS and tried to test several steps of our bioinformatics pipeline. We confirmed that BWA-MEM, the widely-used aligner which is also the choice of VISPA2 has a good performance with 91% accuracy. Further analyses revealed that some of the statistic measurements such as Mapping Quality (MAPQ) and Sub optimal Alignment Score (XS) that are reported for each mapping result are not well-correlated with alignment accuracy. Therefore, filtering steps after alignment might lead to discarding many reads without improving the accuracy. Discarding reads which are aligned correctly might highly reduce sequence count. Moreover, knowing that interaction of several factors such as read length, sequencing errors, uniqueness of the reference genome together could contribute to the final alignment outcome, we proposed a decision tree-based filtering approach. Our result showed that XGBoost algorithm and the set of features which are related to sequence reads, alignment statistics and genome properties with the accuracy of 95% is able to identify artifacts of synthetic reads. This suggested that the current filtering approach can be replaced by our proposed method. In the second part, we aimed at assigning a probability score to each IS to be observed in that genomic region. To achieve this goal, we exploited the known genomic preferences of viral vector and added new genomic features to generate a probability score. Our results on GT patients with two different disease backgrounds showed AUROC > 80%. Majority of IS with low probability score have low values for sequence count and re-occurrence. We are now validating isolated data points with more IS specific analyses.
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Inberg, R. Brandon. "Enhanced step mode FTIR position control." Thesis, Montana State University, 2005. http://etd.lib.montana.edu/etd/2005/inberg/InbergR1205.pdf.
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Jeong, Paul Yonggap. "Mission from a position of weakness /." New York : P. Lang, 2007. http://opac.nebis.ch/cgi-bin/showAbstract.pl?u20=9781433100963.
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Alleyne, Jason C. "Position estimation from range only measurements." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2000. http://handle.dtic.mil/100.2/ADA386399.
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Thesis (M.S. in Mechanical Engineering) Naval Postgraduate School, September 2000.<br>Thesis advisor(s): Healey, Anthony J. "September 2000." Includes bibliographical references (p. 89). Also available online.
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Winter, Pieter Arnoldus. "Position control of a mobile robot /." Link to the online version, 2005. http://hdl.handle.net/10019/1317.
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Ozkaya, Tugba. "Hezbollah And Its Position Towards Israel." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/2/12611119/index.pdf.
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This thesis analyses how Hezbollah has perceived Israel since its establishment. In
this study it is argued that Israel is the main enemy of and source of hatred for
Hezbollah. The references of this overall statement are the ideology and political,
social and military history of Hezbollah. The armed struggle of Hezbollah against
Israel started with the 1982 Israeli invasion of Lebanon evolved into both a
political participation with the continued armed militia in the period between 1982
to today. During this period, in addition to its armed conflict with Israel,
Hezbollah came on the stage with social services for Lebanese society and
political propaganda in Lebanese elections. The intersection point of these three
identities is the endless encouragement of Hezbollah for a determined resistance
against Israel. While on the one hand Hezbollah defines Israel to be the most
dangerous threat for the world, in addition to being a prominent enemy for the
Arab and Muslim community<br>on the other hand Israel regards Hezbollah to be
the highest impact menace. Consequently, the thesis is finalized with outputs and
predictions taking all historical and ideological aspects into concern.
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Treu, Georg. "Position Management für ortsbezogene Community-Dienste." Diss., lmu, 2007. http://nbn-resolving.de/urn:nbn:de:bvb:19-74025.
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Roohi, Melodi. "Hur kan MissBella.se stärka sin position." Thesis, Uppsala universitet, Företagsekonomiska institutionen, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-151486.
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Hassellöf, Daniel. "Position Determination using multiple wireless interfaces." Thesis, KTH, Kommunikationssystem, CoS, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-91861.
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This Master’s thesis studies different ways of exploiting the signal strength measurements from wireless interfaces for position determination. Difficulties include handling the fluctuating observations and their sensitivity to obstruction. We list important factors to take into account before describing a new system based on location fingerprinting and capable of integrating observations from multiple wireless interfaces. Compared to typical fingerprinting solutions, the training time is an order of magnitude shorter, but the location resolution is limited to locations of particular interest. In an office environment, the proposed solution determines the location correctly 80 percent of the time with sufficient precision for being used with context-aware services. In an open space environment, an incorrect location is reported 42 percent of the time.<br>Det här exjobbet studerar olika sätt att använda signalstyrka från trådlösa gränssnitt för positionsbestämning. Några av svårigheterna ligger i att hantera observationernas fluktuationer och deras känslighet för obstruktion. De viktigaste faktorerna att ta hänsyn till tas upp innan ett nytt system beskrivs. Det är baserat på positionsigenkänning (location fingerprinting) och kan dra nytta av observationer från flera olika trådlösa gränssnitt. Jämfört med vanliga metoder för positionsigenkänning är träningstiden en storleksordning kortare, men positionsupplösningen är begränsad till ett visst antal positioner av särskilt värde. I en kontorsmiljö klarar den föreslagna lösningen att korrekt bestämma positionen i 80 procent av fallen med tillräckligt hög noggrannhet för att användas till kontextmedvetna tjänster (context-aware services). I en öppen rumslösning ger lösningen en felaktig position i 42 procent av fallen.
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Ray, Indrani. "Analysis of offset pulse position modulation." Thesis, University of Huddersfield, 2015. http://eprints.hud.ac.uk/id/eprint/24847/.
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This work presents the performance analysis of the offset pulse position modulation (PPM) scheme using graded-index plastic optical fibre with a Gaussian impulse response. The aim of this analysis is to predict how sensitivity, error, number of required photons, threshold voltage, and the effect of inter-symbol interference will change with the change in the number of data bits encoded at a rate of 1 Gbit/s. An information theory analysis is presented in detail and also the band-utilization efficiency is determined. Results are compared to equivalent digital PPM and multiple PPM schemes and it is also shown that offset PPM gives an advantage over on-off keying (OOK). Bit error rate (BER) analysis has been presented numerically. The errors due to different coding techniques are compared. It has also been shown that offset pulse position modulation is more power efficient than multiple pulse position modulation. The spectral analysis of offset pulse position modulation coding scheme has been carried out. For an offset PPM sequence the spectral characteristics is presented both theoretically and numerically. The results show strong frequency components at the frame rate and, if return-to-zero pulses are used, the slot rate. Slot synchronisation has been taken into consideration for the first time as offset PPM spectrum exhibits discrete slot rate component. The effect of pulse shaping and modulating index on the spectrum has been shown. The dependency of slot component on the pulse shape is examined. The results show that the frame synchronisation is possible for offset PPM as this coding exhibits a strong frame rate component. A comparison of spectral characteristics has been presented considering digital, multiple and shortened PPM. For ease of implementation an offset PPM coder has been designed. In this work an efficient clock recovery topology is presented for offset PPM data sequence at the receiver end. For clock recovery, a phase locked loop is designed. Data recovery has also been presented. It is shown that a frame clock can be extracted from the data sequence that yields the possibility of frame synchronization. A detailed noise analysis has been performed for random offset PPM input. It has been shown that the proposed clock recovery system is also effective for extracting other data sequence. To elucidate, a multiple Pulse Position Modulation (MPPM) data sequence is considered. The MPPM data sequence has also been synchronised with the recovered clock. A noise analysis is carried out for multiple PPM.
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Mahmood, Faaiz Hadi. "Implementation of Offset Pulse Position Modulation." Thesis, University of Huddersfield, 2017. http://eprints.hud.ac.uk/id/eprint/34409/.
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Optical fibre systems have played a key role in making possible the extraordinary growth in world-wide communications that has occurred in the last 25 years, and are vital in enabling the proliferating use of the Internet. Its high bandwidth capabilities, low attenuation characteristics, low cost, and immunity from the many disturbances that can afflict electrical wires and wireless communication links make it ideal for gigabit transmission and a major building block in the telecommunication infrastructure. The main concern of this thesis is a full and detailed investigation and implementation of the Offset Pulse Position Modulation (Offset PPM) communication system. Novel work is carried out for applying Offset PPM over an optical communication channel theoretically and experimentally to examine the system performance. An Offset PPM encoder and decoder were implemented to code Pulse Code Modulation (PCM) format into Offset PPM format and to decode back the Offset PPM to PCM. The first paradigm of implementation was implemented using electronic components. A further investigation took place on the Offset PPM associated output. Computer programming and simulation using the VHSIC Hardware Description Language (VHDL) of this PPM code was considered and comparison with previous theoretical results presented. The received Offset PPM signal returned back to its original input PCM form without errors. Successful VHDL and Field Programmable Gate Array (FPGA) implementation using Altera Quartus II of Offset PPM encoder and decoder as a single system has been presented in the study. An FPGA embedded Bit Error Rate (BER) test device has also been implemented for sensitivity measurements purposes and all the designs have been tested successfully with back-to-back testing. Results show that Offset PPM is an advantageous PPM code for optic communication. Furthermore, the system has achieved a very high data rate of 50 Mb/s without an optical communication set. An optical communication system (transmitter/receiver) over POF was developed and the Offset PPM scheme was investigated through this optical channel. Results show that the Offset PPM sequence transferred through the optic system without being altered. In addition, this implementation is optimised PPM coding; the system is working perfectly with up to 10 Mb/s with 10-12 BER based on the limitations of the optical communication set. All the results and analyses indicate that Offset PPM is an ideal alternative to be considered for highly dispersive optical channels, and performance evaluation for higher bandwidths also favourably compares to existing coding schemes.
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Vander, Zanden M. Jake. "Trophic position in aquatic food webs." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ55390.pdf.
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Travis, Melissa E. "Assume the Position: Exploring Discipline Relationships." Digital Archive @ GSU, 2013. http://digitalarchive.gsu.edu/sociology_diss/71.
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Discipline relationships are consensual adult relationships between submissive and dominant partners who employ authority and corporal punishment. This population uses social media to discuss the private nature of their ritualized fantasies, desires, and practices. Participants of these relationships resist a sadomasochistic label of BDSM or domestic abuse. I conducted in-depth interviews and narrative analysis of social media to explore experiences and identities of people in discipline relationships. The sample includes social media bloggers and past and present participants in discipline relationships. I compared explanations participants give for wanting and participating in discipline relationships. I combine identity theory, constructionism, post-structuralism, and critical feminism as an analytic frame to understand this practice sociologically. I found gender differences in the media format and communication style of participants, but the ritualized expressions for discipline relationships remain consistent regardless of gender. The social process of community identification for participants includes coming out, educating others and “inviting in.” The online community provides a forum for relationship negotiation techniques, and encouraging the embrace of non-normative sexual identity. Participants use social media to form a nascent social movement that resists normative views of sexuality and relationships in the dominant culture.