Dissertations / Theses on the topic 'Constellations'
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1
Morris, Neil Gerald. "Working memory constellations." Thesis, Durham University, 1986. http://etheses.dur.ac.uk/7057/.
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Evidence is presented that supports the view that most models of short-term memory cannot account for the flexibility of the primary memory system. It is argued that the working memory model outlined by Baddeley and Hitch (1974) is, however, a potentially adequate model. Working memory, in this thesis, is depicted as a system that assembles 'constellations' consisting of the central executive and one or more sub-systems. This view suggests a formulation that is considerably more complex than the 1974 model. The empirical studies examine the role of the visuo-spatial scratch pad in the formation and maintenance of working memory constellations. It is concluded from these studies that the scratch pad is independent of the articulatory loop but is usually coupled to the central executive except during maintenance rehearsal. Furthermore, it can be used concurrently with the articulatory loop to process spatial aspects of highly verbal tasks. However a constellation consisting of the executive, the loop and the scratch pad is vulnerable to a wider range of interference effects than a simpler constellation. Paivio (1971) suggested that 'dual coding' leads to better memory performance, however, this is only the case when no distractors are present. The final two chapters present some speculations on how working memory research might proceed in the future. It is concluded that the current trend towards collecting convergent evidence and the emphasis on testing theory in applied situations should give us insights into memory that were not available to Ebbinghaus and other early memory researchers.
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Ferentinos, Andrew (Andrew George Phillip). "Constellations and anti-corridors." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/72812.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Architecture, 2012.Page 77 blank. Cataloged from PDF version of thesis.
Includes bibliographical references (p. 67-69).
To perceive the many stars in the sky, corridic logic would force one to view one star at a time, one after the other in a linear order. An anti-corridic logic, on the other hand, is non-linear and permits constellations to emerge: many stars can be perceived at once and the imagination can link them into any desired figure. The space of corridors is linear: rooms are perceived and passed in a fixed sequence of one space following another. The space of anti-corridors is non-linear: rooms are dispersed into a field. Many spaces can be perceived at once and one can pass through them in any order. Desired constellations can emerge. Airports and intermodal hubs typically follow corridic logic. An airport/intermodal hub that is anti-corridic disperses all spaces into a field of options whereby individuals with different itineraries can perceive and move through a field of spatial choices resulting in ideally perceived and desired spatial constellations. This thesis proposes a prototype for an anti-corridic airport/ intermodal hub.
by Andrew Ferentinos.
S.M.
3
Wood, Lloyd. "Internetworking with satellite constellations." Thesis, University of Surrey, 2001. http://epubs.surrey.ac.uk/704760/.
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The development and growth of the Internet during the past thirty years has led to demand for and development of Internet services everywhere and over every possible communications medium. This includes the medium of satellite communications. During those same three decades, the growth in use of satellite communications to provide a widely-available wireless communications infrastructure has led to the development of broadband satellite communications using satellite constellation networks. These two technological trends have intersected. Here, we examine networking and internetworking issues affecting satellite networking in complex satellite constellation networks, and determine what is needed in order to support services based on the TCP/IP suite well in satellite constellations. We analyse constellation network topology. Its movement and effects on end-to-end delays experienced by network traffic travelling across the constellation are examined in detail. Analysis of the impact of cross-seam links upon delays experienced by traffic across star constellations shows that the use of cross-seam links is worthwhile. We examine the effects of multi-path routing within the constellation upon TCP communication, and demonstrate the performance advantages of an intelligent flowbased approach to routing in the constellation network. The desirability of implementing IP routing functionality in the space segment of the constellation is shown. The use of IP routing, to enable good support for IP QoS and IP multicast, is shown to be possible. We present an approach to implementing IP multicast within the constellation, evaluating use of a core-based tree algorithm, and outline an architecture permitting IP routing of IP traffic in an ATM-based satellite constellation network, using MPLS. Finally, we present and demonstrate the advantages of a novel method of managing path delay between ground terminals across a rosette constellation with intersatellite links, by using controlled handover to manage surface diversity to provide classes of service to network traffic.
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Galai, Yoav. "Transnational constellations of the past." Thesis, University of St Andrews, 2017. http://hdl.handle.net/10023/12200.
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This dissertation interrogates the political use of the past in global politics, with a focus on Israel/Palestine. Collective memory is mostly theorised in IR as determinant of national identities. Similarly, in the field of Memory Studies, collective memory is mostly confined to “Methodological Nationalism.” My main argument is that while national narratives purport to be stand-alone stories of the past, or monological narratives, they are in fact in constant negotiation with other stories of that past, they are dialogical. Furthermore, their dynamic transcends the boundaries of the nation state and of transnational institutional politics. To encapsulate these cross-narrative intertextual relationships into a framework that would enable productive analysis, I suggest the re-articulation of the dialogical relationships as transnational constellations, which focus first and foremost on the narratives themselves.
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Huckert, Chantal. "Constellations textiles : la leçon Maya." Paris, EHESS, 1992. http://www.theses.fr/1991EHES0319.
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L'objectif de ce travail est d'analyser et interpreter les figures textiles mayas (c'est a dire, les representations de certains decors textiles), de l'epoque classique. Ayant-disparu physiquement, les tissus existent sous la forme de representations sur les monuments et les ceramiques. L'interet est de connaitre la fonction et la signification de leurs decors en tant qu'ils font partie de la representation dans son ensemble. J'ai choisi des exemples qui me permettent d'etudier les figures textiles dans un contexte epigraphique. La these comprend six chapitres organises conformement au reperage et a la classification des figures. Chaque chapitre est centre sur des figures repetees selon un patron specifique. Dans chacun des chapitres j'examine le cas des figures qu'il comprend et les materiaux iconographiques, stela, linteau, ceramique, qui leur sont rattaches. J'analyse ces representations en tant que plan et tableau et je signale les donnees historiques. Par consequent je puis lire ou rapporter les figures aux entites divines, aux toponymes et aux rituels, indiques dans l'iconographie et l'epigraphie correspondantes. Dans la conclusion a chaque fin de chapitre je reprends les resultats des enquetes specifiques et ebauche ce qui constituera un lexique de figures textiles. Une conclusion commune aux six chapitres preconise l'etude particuliere de chaque site de provenanceThis work takes as its central objective the interpretation and analysis of mayan textiles figures (that is, representations of various patterns of textiles), of the classic epoch. Not having survived as actual fabrics, the textiles appear primarily in the form of monumental and ceramic representations. My interest is to know what are the function and the meaning of the textiles figures within the representation as a whole. Have selected examples which permit me to study the figures within an epigraphic context. The dissertation comprises six chapters which are organized according to the location and classification of the figures. Each chapter focuses on designs repeated in a specific pattern. In each one examine the case of the respective figures and the iconographic materials-stela, lintel, ceramic, which pertain to them. Analysed these representations as a plan, as a picture and as an object having historical significance. Consequently am able to read or reference the figures in terms of their relationship to the divines entities, toponymes and rituals, indicated in the iconography and epigraphy to which they correspond. In the conclusion of each chapter review the results of these specific studies and then outline what will constitute a lexicon of textiles figures. A comprehensive conclusion of the six chapters recommend the particular study of each site of provenance
6
Shah, Naresh Harkishan. "Automated station-keeping for satellite constellations." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10514.
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Toh, Dorothy. "The changing constellations of audit quality." Thesis, London School of Economics and Political Science (University of London), 2016. http://etheses.lse.ac.uk/3426/.
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This thesis examines the emergence and rise of audit quality as an object of concern from the post-war period onwards, as manifested in the discourse of regulators, practitioners and academics primarily in the US and the UK. By drawing upon Burchell et al’s (1985) notions of the arena and the constellation, this thesis seeks to investigate the changing nature of the audit quality ‘problem’ and in so doing, reconceptualises the constellation as being dynamic in nature. It puts forward the notions of the emergent constellation, when an altogether new arena becomes formulated through the emergence of a new event or object and the reformation constellation, when an existing field of operations becomes further delineated or differentiated into more distinct arenas. Central to this dynamism is the notion of linkages, and the precise nature of the linking work entailed, which connect together disparate ideas and attach these to the audit quality discourse. Together, this thesis aims to contribute to our understanding of audit quality, the interrelationship between the three arenas of regulation, practice and academia, and of accounting change. Ultimately, this thesis will show that audit quality, a topic of profound and resilient interest, should be understood primarily, and merely, as a basis through which very particular sets of historically contingent concerns and practices are articulated, and that efforts to measure and improve audit quality are fraught with difficulties. Indeed, the attempts to do so play a role in shifting the conceptualisation of the audit quality problem and are consequently, and in this sense, susceptible to continual failure. An alternate interpretation of the importance and meaning of this rise of audit quality, beyond and irrespective of the large scale failures and crises, is an alignment with the trend of economization in society.
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Hanusse, Nicolas. "Cartes, constellations et groupes : questions algorithmiques." Bordeaux 1, 1997. http://www.theses.fr/1997BOR10646.
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Lobjet de cette etude est la constellation. La carte en est un eminent representant. Un des objectifs de notre travail est de mettre en avant le caractere representatif d'une carte et de montrer qu'une carte est un objet unificateur de domaines varies : combinatoire, theorie de surfaces de riemann, theorie des groupes, theorie de galois. Nous nous sommes attaches a l'etude et au developpement d'algorithmes pour la manipulation et la visualisation des constellations. Les principaux problemes abordes sont les suivants : la generation cartographique, l'action du groupe de tresses sur les constellations, composition et decomposition de constellations et algorithmes de dessins automatiques de cartes.
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Becker, Tanja. "Moduli spaces of (G,h)-constellations." Nantes, 2011. http://www.theses.fr/2011NANT2073.
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Nous construisons l'espace de modules M(X) des (G; h)constellations stables sur X pour un groupe réductif G qui agit sur un schéma ane X sur C et pour une fonction de Hilbert h: IrrG ! N0. Cet espace de modules est une généralisation commune du schéma de Hilbert invariant d'après Alexeev et Brion [AB05] et de l'espace de modules des Gconstellations stables pour un groupe ni G introduit par Craw et Ishii [CI04]. Notre construction d'un morphisme M(X) ! X//G fait de cet espace de modules un candidat pour une résolution des singularités du quotient X//G. De plus, nous déterminons le schéma de Hilbert invariant de la bre en zéro de l'application moment d'une action de Sl2 sur (C2)6. C'est un des premiers exemples d'un schéma de Hilbert invariant avec multiplicités. Ceci nous amène à décrire une façon générale de procéder pour eectuer de tels calculs. En outre, nous démontrons que notre schéma de Hilbert invariant est lisse et connexe : Cet exemple est donc une résolution des singularités de la réduction symplectique de l'actionGiven a reductive group G acting on an a#ne scheme X over C and a Hilbert function h: IrrG ! N0, we construct the moduli space M#(X) of ##stable (G; h)#constellations on X, which is a common generalisation of the invariant Hilbert scheme after Alexeev and Brion [AB05] and the moduli space of ##stable G#constellations for #nite groups G introduced by Craw and Ishii [CI04]. Our construction of a morphism M#(X) ! X//G makes this moduli space a candidate for a resolution of singularities of the quotient X//G. Furthermore, we determine the invariant Hilbert scheme of the zero #bre of the moment map of an action of Sl2 on (C2)#6 as one of the #rst examples of invariant Hilbert schemes with multiplicities. While doing this, we present a general procedure for the realisation of such calculations. We also consider questions of smoothness and connectedness and thereby show that our Hilbert scheme gives a resolution of singularities of the symplectic reduction of the action
10
Becker, Tanja. "Espaces de modules de (G,h)-constellations." Phd thesis, Université de Nantes, 2011. http://tel.archives-ouvertes.fr/tel-00675853.
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Nous construisons l'espace de modules M_θ(X) des (G,h)-constellations θ-stables sur X pour un groupe réductif G qui agit sur un schéma affine X sur C et pour une fonction de Hilbert h: Irr G → N_0. Cet espace de modules est une généralisation commune du schéma de Hilbert invariant d'après Alexeev et Brion et de l'espace de modules des G-constellations θ-stables pour un groupe fini G introduit par Craw et Ishii. Notre construction d'un morphisme M_θ(X) → X//G fait de cet espace de modules un candidat pour une résolution des singularités du quotient X//G. De plus, nous déterminons le schéma de Hilbert invariant de la fibre en zéro de l'application moment d'une action de Sl_2 sur (C²)⁶. C'est un des premiers exemples d'un schéma de Hilbert invariant avec multiplicités. Ceci nous amène à décrire une façon générale de procéder pour effectuer de tels calculs. En outre, nous démontrons que notre schéma de Hilbert invariant est lisse et connexe : Cet exemple est donc une résolution des singularités de la réduction symplectique de l'action.
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Sanzgiri, James Suneil. "Domesticating the ghost : constellations of Mexico, 1968." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/111271.
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Thesis: S.M. in Art, Culture and Technology, Massachusetts Institute of Technology, Department of Architecture, 2017.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis. Page 96 blank.
Includes bibliographical references (pages 93-95).
Organized primarily as an essayistic method of investigation to accompany and supplement my thirty-minute short film AT THE TOP OF GRASSHOPPER'S HILL, this thesis traces minor encounters or discrepant engagements¹ between myself and and images of the 1968 state-sponsored student massacre in Mexico City. I adopt these engagements, most of which exist as encounters within state-sponsored institutions, to take 1968 and the Tlatelolco Massacre as a point of departure with which to navigate the density of such questions and problems as the production of collective memory, cultural heritage, disappearance, the archive, history and authority, and above all how power and knowledge function within a hegemonic terrain. Through an analysis of the many manifestations of images surrounding the 1968 student massacre, including Hollywood-esqe adaptations and 16mm documentation of the event by the military themselves, I explore the role representation plays in political struggles as well as its potential co-optation by the state. Such co-optation I argue, perpetuates cycles of oppression that maintain the status quo; and within Mexico specifically, the nearly ninety-year rule of the PRI party. At its essence, this thesis pries open the inconsistencies of such representations within Mexico, 1968 and its aftermath. These questions are sparked by my long term considerations of theorists such as Walter Benjamin, Paul Virilio, and Michel Foucault. I have found my investigations within Mexico indicative of their writings among a range of others that appear in this text. As such, this essayistic exploration stretches and drifts across many different disciplines, geographies, and figures. Thus, I develop a "constellatory framework" to expand an analysis of technologies of reproduction themselves towards their facility to impact national memory through circulation.
by James Suneil Sanzgiri.
S.M. in Art, Culture and Technology
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Chatham, Rick 1962. "Constellations: For Wind Ensemble and Computer Music." Thesis, University of North Texas, 1992. https://digital.library.unt.edu/ark:/67531/metadc1038771/.
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Constellations is a single movement work that explores the color between acoustic instruments and computer generated sounds. It is scored for four flutes (two doubling on piccolos), two oboes, two bassoons, eight B-flat clarinets, two bass B-flat clarinets; two alto saxophones, tenor saxophone, baritone saxophone; four trumpets in B-flat, four horns in F; three trombones, bass trombone; two tubas;piano; six percussionists; and contrabass. The duration of the work is nine minutes and twenty-eight seconds. Mapping of stellar constellations provide the primary material for all pitch and harmonic progressions throughout the work. Software synthesis and digital sampling techniques coalesce to produce the computer music on tape.
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Wallbaum, Christopher. "Summary comparing normative constellations in music education." Georg Olms Verlag, 2018. https://slub.qucosa.de/id/qucosa%3A34646.
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This summary connects parts of nearly every chapter of the book with a thick brush regarding normative constellations. Comparing the constellations shows both, how practices within lessons are normatively connected with practices in other social fields, and that there are fractures that show a need for further research. In conclusion I sketch a model for comparative praxial music education.
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Mayr, Fabian Patrick. "Consciousising Relatedness. Systemic Conflict Transformation in Political Constellations." Doctoral thesis, Universitat Jaume I, 2010. http://hdl.handle.net/10803/669142.
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Los conflictos son. En esta frase, aparentemente incompleta, residen muchos elementos importantes para el estudio de los conflictos y su transformación - la práctica. En una visión más reciente de los conflictos, estos no son percibidos como algo estrictamente negativo, limitados por el tiempo y violentos, sino principalmente como relacionales, que no deben ser juzgados de antemano, considerados desde un enfoque positivo y, sobre todo, transformables.
Esta es la noción de los conflictos que será fundamental en este trabajo según la encontramos en el discurso contemporáneo sobre la transformación de los conflictos. De esta manera, los conflictos están omnipresentes en por lo menos cuatro dimensiones de nuestro Ser fenomenológico: intrapersonal, interpersonal, estructural y cultural. Los conflictos siempre tienen elementos psicológicos y sociológicos que coexisten y por lo tanto habrá que contemplar lo psicosocial de ¿Quién y cómo soy yo en los sistemas sociales? Nuestro Ser está siempre vinculado a los sistemas de los cuales formamos parte. No podemos no formar parte de ciertos sistemas. Tan pronto como la vida humana comienza, tan pronto como estamos en el mundo, es la familia; son padres y niños. De esta manera nuestro Ser sistémico está más entre nosotros que en nosotros. Las relaciones que formamos y que naturalmente tenemos nos influyen mucho más de lo que yo soy como individuo.
La hipótesis de este trabajo es: "La esencia de la transformación de conflictos son las relaciones dentro de, y en particular entre, las partes en conflicto. Una mayor consciencia acerca de la relacionalidad suscitada con el método fenomenológico de las constelaciones sistémicas, permite acercarse con más transcendencia al Ser, el cual consiste en cuatro dimensiones: translocalidad, -personalidad, -racionalidad, y -temporalidad."Conflicts are. This seemingly incomplete sentence bears many insights for the study of conflicts and their transformation - the practise. A newer consciousness of conflicts perceives them not per se as something negative, timely limited and violent but as first of all relational, not to be immediately judged on, also positive, and only transformable. This is the notion of conflicts that will be underlying this work and as we find it in the contemporary conflict transformation discourse (e.g. Lederach, 2005, 2007a; Galtung, 2000; Senghaas, 2004; Wills and others, 2006). Thereby conflicts are ubiquitously present on at least four dimensions of our phenomenological Being (Heidegger, 1995): the intrapersonal, the interpersonal, the structural, and the cultural one (e.g. Lederach and Maiese, 2003; Galtung, 2003). Conflicts always have psychological and sociological elements which coexist and therefore have to be contemplated psychosocially of: How and who am I in social systems? Our Being is always bound to systems we are forming part of. We cannot not be in systems. As soon as human life is formed, as soon as we are in the world, is family; are parents and child (Mahr, 1996). Thereby our systemic Being is more between us than in us. The relationships we form and naturally have, shape us much more than what I am individually
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Grandchamp, Enguerran. "Quelque contribution à l'optimisation de constellations de satellites." Phd thesis, Institut National Polytechnique de Toulouse - INPT, 2001. http://tel.archives-ouvertes.fr/tel-00634769.
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A mi-chemin entre l optimisation et l astronautique ce travail de recherche s attaque au problème du design de constellations de satellites Déterminer le nombre de satellites nécessaires pour ré- pondre à un besoin et les positionner de manière correcte tels sont les enjeux techniques de cette thèse Minimiser les coûts et les délais tels sont les enjeux économiques auxquels est confronté le domaine spatial au quotidien Les difficultés majeures de ce problème sont d une part la taille et les caractéristiques de l espace de recherche; D autre part la non-régularité des critères utilisés et la nature mathématique et phy- sique hétérogène de l ensemble des paramètres (paramètres entiers et paramètres réels) interdisant l utilisation d algorithmes classiques; Enfin l évaluation des solutions qui met en oeuvre une simu- lation coûteuse en temps et en calculs sans retourner d information pertinente sur les bonnes ou mauvaises propriétés de la constellation évaluée interdit une exploration massive de l espace de recherche De ces constatations et de diverses études préliminaires est née une nouvelle approche Basé sur une meilleure exploitation de la simulation et sur une simplification des critères utilisés l algorithme composé de plusieurs niveaux met en oeuvre plusieurs techniques d optimisation En intégrant une base de connaissance sur les orbites et une méthode numérique de recherche d optimum le tout or- chestré par un algorithme métaheuristique cette nouvelle approche tente de résoudre les difficultés intrinsèques au domaine d application en décomposant le problème.
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Koo, Gregory Andre. "Signal constellations of a retrodirective array phase modulator." Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/39612.
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A quadrature phase shift keying (QPSK) retrodirective array phase modulator (RAPM) was designed and fabricated to characterize its backscatter signal constellation when placed near objects with varying conductivities and relative permittivities. The signal constellations produced when the RAPM was placed near objects were compared to a constellation in free space to determine relative magnitude and phase changes. When conductors and high permittivity dielectrics were placed close behind the RAPM, constellation points were found to shrink in magnitude by up to twenty percent and shift in phase by up to eight degrees. When conductors were placed between the RAPM and an interrogator, the signal constellation was found to collapse, shrinking by up to 95.6 percent. For materials similar to free space, minimal constellation shrinkage resulted, but signal constellation rotation by up to 68 degrees occurred. The power consumption of a RAPM was also characterized and found to decrease as the number of bits per symbol increased. This result demonstrates that in comparison to conventional backscatter tags, which implement one bit per symbol, the RAPM can implement a greater number of bits per symbol, reduce its power consumption, and increase its range in a passive backscatter communication system. To characterize the beamwidth of the RAPM's retrodirective array, a radar cross section (RCS) measurement of the RAPM was performed over a scan angle range of -90 to +90 degrees. The structural component generated by the RAPM's patch antenna ground plane was found to dominate the antenna mode of the retrodirective array. As a result, a novel homodyne receiver based RCS measurement was performed to filter out the structural RCS component and measure the pure antenna mode of the RAPM.
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Wilkins, Matthew Paul. "The Flower Constellations - theory, design process, and applications." Texas A&M University, 2004. http://hdl.handle.net/1969.1/3053.
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In this research, constellations of satellites all having orbits compatible with rotating
reference frames are considered. That is to say, no matter how many satellites are considered
for the constellation, when viewed from an arbitrarily defined rotating reference frame
of interest, they all follow a single, identical relative trajectory. In this regard, one could
think of the relative trajectories as ?space trajectories on a rotating reference frame.?
In particular, this research concerns itself with reference frames constrained to rotate
with the planet under consideration (e.g. the Earth Centered Earth Fixed (ECEF) frame,
a frame rotating with the Earth). When the axis of symmetry of these constellations is
aligned with the spin axis of the planet, then the ground track as projected onto the planet
surface will be repeating.
Flower Constellations are identified by eight parameters. Five are integer parameters:
the number of petals (Np), the number of sidereal days to repeat the ground track (Nd), the
number of satellites (Ns), and two integers to govern the phasing (Fn and Fd). Three are
orbit parameters that are generally equal for all satellites: the argument of perigee (w), the
orbit inclination (i), and the perigee altitude (hp). Each of these parameters has a unique effect on the overall design of a Flower Constellation. Based upon specific choices of these parameters, some broad categories of constellation types are presented along with some unique cases. Often, a large number of satellites are used to completely visualize these constellations. While Flower Constellations lend themselves to micro- and nano-satellite constellations very easily, they are also readily scalable to any mission requirement. Also investigated are inverse design techniques where the governing equations are solved for the Flower Constellation parameters to achieve a desired final constellation or formation shape. Flower Constellations present beautiful and interesting dynamical features that allow us to explore a wide range of potential applications that include: telecommunications, Earth and deep space observation, global positioning systems, and new kinds of formation flying schemes among others. To demonstrate their potential, some specific Flower Constellations are described and discussed. Finally, the effect of perturbations such as the Earth?s oblateness are investigated and options for mitigating perturbations are discussed.
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Mah, Edward. "Phase sweeping transmit diversity with fading resistant constellations." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0008/MQ34137.pdf.
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Zaidan, Mahdi Yahya. "Trellis coded modulation with σ-tree signal constellations." Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/14984.
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Becker, Tanja [Verfasser]. "Moduli spaces of (G,h)-constellations / Tanja Becker." Mainz : Universitätsbibliothek Mainz, 2011. http://d-nb.info/103180112X/34.
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Kwok, Kenneth C. H. (Kenneth Chun Hei) 1977. "Cost optimization and routing for satellite network constellations." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8774.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.Includes bibliographical references (p. 140-142).
Low-earth orbit (LEO) satellite communications systems have been under rapid development in the past few years as it is predicted that they will become part of the Next Generation Internet (NGI), a global heterogeneous network that provides ubiquitous access to every part of the world. Nevertheless, very little research has been done on the cost aspect of a satellite network. In this thesis, uplink and downlink costs are ignored and a cost equation based solely on crosslinks is developed and studied closely together with a seamless constellation model. Using this cost equation, cost optimization is performed in LEO and GEO satellite systems to find the optimum constellation size with respect to the amount of uniform traffic present. Modifications of the constellations, such as the 3-crosslink-per-node mesh network, and the 1-inter-plane-crosslink mesh network, are introduced in an attempt to further reduce the cost of the system. Interaction of hotspot traffic with uniform traffic in a square mesh is also studied. We are able to find a lower bound and an upper bound of the minimum required crosslink capacity, given a stream of uniform traffic and multiple streams of hot spot traffic. We also find the properties of hot spot traffic in an infinite grid and extend the result to a fixed size grid. Finally, the notion of incorporating the satellite network into the global heterogeneous network is explored. The relationship between the satellite network and the terrestrial network is studied. In particular, the assignment of cost metrics to inter-satellite links, uplinks and downlinks, and terrestrial links is investigated. At the end a basic simulation of the traffic in a heterogeneous network is developed in MATLAB, which can be used to study the transient properties of the network.
by Kenneth C.H. Kwok.
S.M.
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Twohig, Niall Ivan. "Revolutionary Constellations| Seeing Revolution Beyond the Dominant Frames." Thesis, University of California, San Diego, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10161871.
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The dissertation looks beyond the dominant frames of Western epistemology and philosophy that largely determine the ways revolution and revolutionaries are conceptualized and remembered in modern society. Rather than focusing on historically grounded political projects that conform to a particular revolutionary doctrine, our focus will be on common people whose praxis posed, and still poses, an alternative to a social order premised on the separation and stratification of the commons and its people. The revolutionaries we will meet in these pages see through what we will unravel as the myth of separateness. They see through a mythic reality that veils people’s interconnections with each other, with the commons, and with the cosmos from which all life emerges. Their praxis touches this deeper reality.
To ground our discussion, we will look deeply at three flashpoints of revolt against the myth as it manifested itself in the liberal capitalist regimes of the 19th and 20th centuries: The Paris Commune of 1871, the student protests of 1968 in Paris and Mexico, and a self-immolation in protest of the Vietnam War that occurred in 1970. We will thread these flashpoints together to see how, despite the distance that separates these revolts in time and space, they illuminate an alternative way of being that stands in contrast to the atomized, competitive, and militant existence that is formed in the crucible of liberal capitalist empire. Threading these flashpoints together, we will begin to reconceptualize what is meant by success and failure, beginnings and endings. Though these revolts may end with defeat and death, the way of being that they touched continues on past their historical or biographical endpoint. Like the light from a dead star or from an extinguished candle, their revolution travels across space and across time waiting for the right conditions to manifest itself again in renewed praxis. Cultural production, particularly art and literature, will serve as our vehicle for illuminating this revolution and its continuations.
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Grandchamp, Enguerran. "Quelques contributions pour l'optimisation de constellations de satellites." Toulouse, INPT, 2001. http://www.theses.fr/2001INPT045H.
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A mi-chemin entre l'optimisation et l'astronautique, ce travail de recherche s'attaque au problème du design de constellations de satellites. Déterminer le nombre de satellites nécessaires pour répondre à un besoin et les positionner de manière correcte, tels sont les enjeux techniques de cette thèse. Minimiser les coûts et les délais, tels sont les enjeux économiques auxquels est confronté le domaine spatial au quotidien. Les difficultés majeures de ce problème sont : d'une part la taille et les caractéristiques de l'espace de recherche; D'autre part la non-régularité des critères utilisés et la nature mathématique et physique hétérogène de l'ensemble des paramètres (paramètres entiers et paramètres réels) interdisant l'utilisation d'algorithmes classiques; Enfin l'évaluation des solutions qui met en oeuvre une simulation coûteuse en temps et en calculs sans retourner d'information pertinente sur les bonnes, ou mauvaises, propriétés de la constellation évaluée interdit une exploration massive de l'espace de recherche. De ces constatations et de diverses études préliminaires est née une nouvelle approche. Basé sur une meilleure exploitation de la simulation et sur une simplification des critères utilisés, l'algorithme composé de plusieurs niveaux met en oeuvre plusieurs techniques d'optimisation. En intégrant une base de connaissance sur les orbites et une méthode numérique de recherche d'optimum,le tout orchestré par un algorithme métaheuristique, cette nouvelle approche tente de résoudre les difficultés intrinsèques au domaine d'application en décomposant le problème.
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Bergé, Aline. "Philippe Jaccottet, trajectoires et constellations : lieux, livres, paysages /." Lausanne : Éd. Payot Lausanne, 2004. http://catalogue.bnf.fr/ark:/12148/cb39953489m.
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Holden, Bobby Glenn II. "Onboard distributed replanning for crosslinked small satellite constellations." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/122513.
Full textAbstract:
Thesis: S.M., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 2019Cataloged from PDF version of thesis.
Includes bibliographical references (pages 81-85).
This work implements distributed onboard planning and scheduling approach for crosslinked small satellites Earth observation missions. The example cases used involve 65 small satellites in ISS and Sun Synchronous Orbits, as well as NASA's Near Earth Network groundstations, and three target cases. Target cases include urgent observations. This work focuses on handling dynamic modifications to an existing nominal plan. The disruptions considered include failures to complete an activity and new user requests. The Scheduling Planning Routing Intersatellite Networking Tool, or SPRINT, is the infrastructure used in this work. SPRINT's global planner advances the state of the art by addressing the combinatorially expensive crosslink routing planning challenges, given the constraints of small satellites. SPRINT's distributed onboard planner, the focus of this work, manages both proactive state sharing and reactive planning activities. By introducing robust onboard planning components, high-performance schedules are enabled. An atmospheric model is integrated to provide the SPRINT scenarios. Results are presented for performance of the onboard replanning system. Given arbitrary activity failures, improvement, by means of reduction of the penalty, of 6 to 10 times the unmitigated effects are demonstrated using the onboard planning approach. A path to flight software integration is developed.
NASA Small Spacecraft Technology Program (SSTP)Grant/ Cooperative Agreement Number 80NSSC18M0042
by Bobby Glenn Holden II.
S.M.
S.M. Massachusetts Institute of Technology, Department of Aeronautics and Astronautics
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Browning, Helen. "Producing constellations : opening new documentary to rhizome theory." Thesis, Queensland University of Technology, 2004. https://eprints.qut.edu.au/15944/1/Helen_Browning_Thesis.pdf.
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Uncertainty is a documentary film about belief systems that human animals use to navigate the unknown and assign meaning to experiences. It acknowledges that we exist amidst the parameters of our own perceptual constructs. Our frameworks for navigation often range in degrees of openness to the unknown and to outside scrutiny.
I set out to explore these concepts through interactions with different individuals and social groups, each with their unique templates. I hoped to produce a stimulating film that engaged diverse audiences through diverse content.
Structural and stylistic considerations are paramount to my theoretical and post-production reflections on Uncertainty. Deleuze and Guattari's (1988) theory of rhizomes provides a good reference in terms of the cross-fertilisation of ideas, decentralised structure and different states of connection that I hoped to provoke through the film.
New documentary theory highlights a trend towards greater interaction between filmmaker, audience and subject (Bruzzi, 2000). This signals a growing understanding that striving for objectivity in documentary is redundant. Although it is a welcome development, discussion could be broadened in relation to filmmaker presence and interactivity, to include style and structure as modes of primary interaction for the filmmaker with the audience and subject. This exegesis approaches expanding the parameters for interaction to examples, such as Uncertainty, where the filmmaker is neither present in image or voice.
Texts that offer constellations of ideas, like a rhizome, provide an alternative to those following a more linear progression or centralised argument. Promoting greater connectivity and multiplicity in documentary is congruous with the current developments in communications and technologies.
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Browning, Helen. "Producing Constellations : Opening New Documentary To Rhizome Theory." Queensland University of Technology, 2004. http://eprints.qut.edu.au/15944/.
Full textAbstract:
Uncertainty is a documentary film about belief systems that human animals use to navigate the unknown and assign meaning to experiences. It acknowledges that we exist amidst the parameters of our own perceptual constructs. Our frameworks for navigation often range in degrees of openness to the unknown and to outside scrutiny. I set out to explore these concepts through interactions with different individuals and social groups, each with their unique templates. I hoped to produce a stimulating film that engaged diverse audiences through diverse content. Structural and stylistic considerations are paramount to my theoretical and post-production reflections on Uncertainty. Deleuze and Guattari's (1988) theory of rhizomes provides a good reference in terms of the cross-fertilisation of ideas, decentralised structure and different states of connection that I hoped to provoke through the film. New documentary theory highlights a trend towards greater interaction between filmmaker, audience and subject (Bruzzi, 2000). This signals a growing understanding that striving for objectivity in documentary is redundant. Although it is a welcome development, discussion could be broadened in relation to filmmaker presence and interactivity, to include style and structure as modes of primary interaction for the filmmaker with the audience and subject. This exegesis approaches expanding the parameters for interaction to examples, such as Uncertainty, where the filmmaker is neither present in image or voice. Texts that offer constellations of ideas, like a rhizome, provide an alternative to those following a more linear progression or centralised argument. Promoting greater connectivity and multiplicity in documentary is congruous with the current developments in communications and technologies.
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Dhaou, Riadh. "Modélisation de réseaux composés de constellations de satellites." Paris 6, 2002. http://www.theses.fr/2002PA066405.
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Boukhatem, Lila. "Le handover dans les constellations de satellites LEO." Paris 6, 2001. http://www.theses.fr/2001PA066501.
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Basil, Peter G. "Real-time multi-frequency modulation using differentially-encoded signal constellations." Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA236839.
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Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, June 1990.Thesis Advisor(s): Moose, P. H. Second Reader: Terman, F. W. "June 1990." Description based on title screen as viewed on October 19, 2009. DTIC Descriptor(s): Signal processing, input, control, industries, real time, computers, signal to noise ratio, rates, coding, receivers, errors, data acquisition, vector analysis, throughput, microcomputers, data rate, modulation, data processing equipment, decoding, plug in units, frequency DTIC Indicator(s): Packet communications, frequency modulation, program listings, signal to noise ratio. Author(s) subject terms: MFM, Differential encoding, D16QAM Includes bibliographical references (p. 68). Also available in print.
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Sanders, Devon Stetson. "Study of Lunar Constellations for Situational Awareness and Surveillance." MSSTATE, 2006. http://sun.library.msstate.edu/ETD-db/theses/available/etd-11072006-111530/.
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Lunar constellations providing the capabilities of situational awareness and surveillance for future mission operators are analyzed in this study. The use of specialty orbits, such as sun-synchronous and frozen orbits, are analyzed to determine the applicability of these unique orbits. Additionally, altitude and inclination trades are performed to determine the degree to which mission objectives are achieved through ranges of these orbital parameters. Using the analyzed orbits, constellations of varying patterns are developed and surface coverage figures of merit are used to evaluate them. The research concludes with calculation of the yearly cross-track and in-track stationkeeping costs of a representative constellation. This stationkeeping is necessary for preservation of the designed coverage statistics.
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Kitchens, John David Stone Lynda. "Orientation and education critical constellations in the new millennium /." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2007. http://dc.lib.unc.edu/u?/etd,1130.
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Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2007.Title from electronic title page (viewed Mar. 27, 2008). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the School of Education Culture, Curriculum, and Change." Discipline: Education; Department/School: Education.
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Pressley, Daniel Lawrence. "Constellations : authorship and authority in Franz Kafka’s short prose." Thesis, University of Warwick, 2008. http://wrap.warwick.ac.uk/877/.
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More than eighty years after the death of its author, Kafka fiction continues to stimulate diverse critical interest: only Shakespeare has generated more publications, more biographies or indeed more PhD theses. In recent years, scholarship has recognised the irreducible, polysemantic nature of Kafka’s writing as a stimulus for this regenerative criticism. Another factor is the author himself, along with his well-known biography. Particularly in published monographs, Franz Kafka’s life story has attracted almost as much attention as the fiction he produced. Thus, unusually for a writer whose works have been so thoroughly dissected by criticism, Franz Kafka seems to have survived the so-called death of the author, promulgated throughout literary theory. This thesis highlights a tension between these two stimuli; between the elusive multivocality of Kafka’s fiction and the ongoing influence of the author. It argues that mythologies about Kafka have now outlived their usefulness, and suggests that greater attentiveness to theoretical insights might benefit the field. Accordingly, this study proposes new ways of looking at Kafka which marginalise the influence of the author and related approaches to his fiction. In its investigation of authority as a theme of Kafka’s writing, this volume repositions Kafka’s fictional and non-fictional output within new and established contexts, exploring philosophical and critical dimensions of the oeuvre. In so doing, it asks what Kafka can teach us about our reading of Kafka, our reading of theory and reading in general.
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Ritchey, Kathleen M. "Women with a history of incest : MMPI profile constellations." Virtual Press, 1991. http://liblink.bsu.edu/uhtbin/catkey/776710.
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The current study assessed the effects of incest utilizing the Minnesota Multiphasic Personality Inventory (MMPI), an objective measure that can address such long term effects as low self esteem, isolation, depression, anxiety, suicidality, substance abuse, impaired sexual adjustment, psychosomatic concerns, and interpersonal relationship difficulties. Eighty-one women seeking counseling for issues related to an incestuous childhood, and 90 non sexually abused adult female clients completed the MMPI and a background information questionnaire.A Multivariate Analysis of Variance test comparing the mean profiles demonstrated that the incest group was more somatic, depressed, angry, anxious, and confused. A chi square analysis of two-point code type configurations found the incest group being more classified by the 48/84 and the 24/42 code types whereas the control group was more represented by the 46/64 code type. Lastly, the groups were compared by completing cluster analyses on each group's profiles. Both groups yielded an "overwhelmed" cluster that was statistically the same. Secondly, they each yielded a "normal" cluster that was similar but statistically different. Finally, the incest group yielded an "angry and confused" cluster and the control group yielded a "somatizer" cluster. Descriptions of the clusters and reasons for their differences are proposed.Differential impact was examined by comparing the incest clusters on number of abusers, use of threat or force, identity of the abuser, perceived betrayal by a non offending parent, length of time since abuse, and length of time in counseling. The only significant finding in these analyses was that the "overwhelmed" cluster had a greater number of abusers than the "angry and confused" and the "normal" clusters.The first two analyses were included in the study to validate the similarity of the present data with previous research and to demonstrate the myopic vision that results from analyzing the data in these manners. The cluster analysis allowed for the examination of the differential impact of the numerous long term sequalae. Recommendations for further research are presented as well as implications for treatment.Department of Counseling Psychology and Guidance Services
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Gillis, A. A. "Awakening constellations : history in Irish poetry of the 1930s." Thesis, Queen's University Belfast, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390887.
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Thompson, Zoë. "Urban constellations : reading contemporary cityscapes with Benjamin and Baudrillard." Thesis, University of Birmingham, 2010. http://etheses.bham.ac.uk//id/eprint/1188/.
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This thesis seeks to contribute to the literature on Walter Benjamin and Jean Baudrillard, but not to merely retread old debates. It is concerned instead with a re-evaluation of the work of both thinkers in a particular context: the experience of the new cultural spaces, of twenty-first century post-industrial cities, and in relation to each other. I argue, following Benjamin, that these spaces function as contemporary ‘dreamhouses’. Deploying a constellation of Benjamin and Baudrillard’s ideas to read such spaces illuminates the experience of the contemporary cityscape around the themes of spectacle, distraction, interactivity, simulation and consumption. The thesis examines how these iconic architectural projects, the technological body of the cityscape, mediate our experiences of art, nature, personal and collective memory, and notions of public culture. I argue that we must read Benjamin again after Baudrillard in order to assess the value of both thinkers’ contribution to the understanding of contemporary cities organisation of space and culture. The contingent proximity that is uncovered when reading the theorists both together and against each other, is one which ultimately argues for the persistence of certain ‘messianic’ moments; traces or interruptions which can be uncovered against the notion of Baudrillardian ‘simulation’. This is to take seriously, rather than dispense with, Baudrillardian ideas. Both Benjamin and Baudrillard, together, are necessary to understand the experience of contemporary urban culture. Taking the form of four empirical encounters between the theoretical concepts and the cultural spaces themselves, I set out to locate these messianic possibilities. Each of the analytical chapters focuses on a different cultural space: The Lowry, Salford; The Deep, Hull, The Sage, Gateshead; and The Public, West Bromwich.
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Marinan, Anne Dorothy. "From CubeSats to constellations : systems design and performance analysis." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/85807.
Full textAbstract:
Thesis: S.M., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 2013.Cataloged from PDF version of thesis. "September 2013."
Includes bibliographical references (pages 87-91).
The primary purpose of an Earth observing spacecraft constellation is to obtain global measurements with improved spatial and temporal resolution. The small size, low cost, standardized form factor, and increasing availability of commercial parts for CubeSats make them ideal for use in constellations. In this work, we provide an in-depth analysis of how to evolve from a single Earth-observing CubeSat to an effective CubeSat constellation. We first consider pointing capability provided by three different CubeSat attitude determination and control system (ADCS) architectures to an Earth-observing payload. Our approach of performing a comprehensive orbital altitude and inclination reference point analysis for all subsystems allows us not only to evaluate trades between subsystems when designing a CubeSat that may be manifest in any low-Earth orbit, but the reference point analysis also provides a database of impacts that the orbital parameters have on subsystems and performance for designing a constellation. Next, we consider the practical challenge of trying to launch and distribute a CubeSat constellation into a specific configuration. We suggest a cost-effective way to launch a constellation of CubeSats via consecutive secondary payload launch opportunities.
by Anne Dorothy Marinan.
S.M.
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Hein, Ayesha Georgina (Ayesha Georgina Iwalanai). "A systems analysis of CubeSat constellations with distributed sensors." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/112464.
Full textAbstract:
Thesis: S.M., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 2017.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 95-103).
This thesis explores the use of CubeSat constellations as "gap fillers" and supplements to traditionally complex, multi-sensored satellites, increasing resiliency of the system at very low cost. In standard satellite acquisitions, satellites can take years and billions of dollars to reach operational status. Should there be delays in schedule or on-orbit failures, gaps in data integral to US operations can be lost. CubeSats present a low cost temporary solution. In this thesis, the weather sensing satellite, JPSS-1, is used as a reference case for a traditional multi-sensored satellite. The sensors from JPSS-1 are paired with state-of-the-art CubeSat sensors of similar functions. These CubeSats are used to make up three different constellation architectures which are examined for the revisit times and coverage they offer. These architectures are based on some of the common methods of launching and implementing a CubeSat constellation, a single mass launch, a series of available launches, and a planned configuration. This analysis shows that in some areas, like radiometry, CubeSat sensors are comparable with operational heritage sensors. In the other cases, like optical imaging and hyperspectral imagers, CubeSats have not yet advanced enough or cannot be advanced much more based on the limitations of their size and power. A practical use of a CubeSat constellation is to supplement and augment a traditional system, increasing the overall redundancy and providing data over larger geographic regions and with lower revisit times for a approximately 4.5% of the cost of a traditional satellite.
by Ayesha Georgina Hein.
S.M.
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Legge, Robert S. Jr. "Optimization and valuation of recongurable satellite constellations under uncertainty/." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/97261.
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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 2014.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 303-320).
Space-based persistent surveillance provides decision makers with information necessary to effectively respond to both natural and man-made crises. This thesis investigates a reconfigurable constellation strategy that utilizes on-demand, maneuverable satellites to provide focused regional coverage with short revisit times at greatly decreased cost when compared to traditional static satellite constellations. The thesis develops and demonstrates a general framework to guide the design and optimization of recongurable satellite constellations specifically tailored to stakeholder objectives while considering requirement uncertainty. The framework is novel in that it avoids many of the assumptions and simplifications of past research by: 1. explicitly considering uncertainty in future operating conditions; 2. concurrently optimizing constellation pattern design, satellite design, and operations design; and, 3. investigating layered and asymmetric patterns. The framework consists of three elements: a detailed simulation model to compute constellation performance and cost for a variety of architectures and patterns, Monte Carlo simulation to determine how well each design performs under uncertain future conditions, and a parallel multi-objective evolutionary algorithm developed from the [epsilon]-NSGA-II genetic algorithm to nd designs that maximize performance while simultaneously minimizing cost. Additionally, a new performance metric is developed to measure directly how well a design meets desired temporal and spatial sampling requirements and a decision model and optimal assignment process is developed to determine how to employ the option of reconfigurability to respond to specific regional events. The framework was used to perform 85 optimization runs selected to compare the cost-effectiveness of several constellation architectures over varied operating conditions and coverage requirements. All optimization runs were performed in less than three months, demonstrating that parallel computing coupled with sophisticated optimization routines enable rapid spiral development of satellite constellations. Results show that recongurable constellations cost 20 to 70% less than similarly performing static constellations for the scenarios studied. The cost savings grows with increasingly demanding coverage requirements. Results from optimizing a fully asymmetric constellation pattern led to two the development of new 'quasi'-asymmetric patterns that were found to significantly outperform symmetric patterns for providing discontinuous coverage. Additionally, results show that the sun-synchronous and rapid launch architectures are the least cost-eective approaches.
by Robert Scott Legge Jr.
Ph. D.
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Kennedy, Andrew Kitrell. "Planning and scheduling for earth-observing small satellite constellations." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/120415.
Full textAbstract:
Thesis: Ph. D. in Space Systems, Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 2018.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 225-235).
The growth of Earth-observing small satellite constellations requires effective, automated operations management. State-of-the-art techniques must be improved to manage scheduling of observation data collection, data routing through a crosslinked constellation network, and maintenance of limited onboard resources, as well as to enable scaling to hundreds of satellites. This work has four primary contributions. The first is the development of a hierarchical smallsat constellation planning and scheduling system that addresses data routing and resource management. A centralized ground-based algorithm, the Global Planner, manages the whole constellation, while an onboard algorithm, the Local Planner, replans in real-time to handle urgent, unexpected observations. The second contribution is the development of the software infrastructure for simulating the constellation with high fidelity. The third is the analysis of system performance with a set of representative orbit geometries, ground station networks, and communications contexts. The fourth is the demonstration of routing of urgent observation data. The Global Planner algorithm demonstrates execution on larger problem sizes than the state-of-the-art, by quickly executing for both long planning horizons (requiring < 1 minute for a 1000 min. horizon) and many satellites (< 30 mins for 100 sats). Representative constellation geometries are simulated and analyzed with a 6U CubeSat bus model, including a 10-sat Sun-synchronous Orbit Ring and a 30-sat Walker Delta constellation. The improvement using crosslinks in addition to downlinks is assessed over a set of metrics including observation data throughput, latency of data delivery to ground, average Age of Information (freshness) of observation data, and freshness of TT&C data. In every case, performance is found to improve when using crosslinks and downlinks versus only using downlinks. Unplanned, urgent observation data is routed effectively by the Local Planner, achieving comparable latency performance with regular observation data (median of 42 minutes versus 38 mins) in a 6-sat simulation. This work enables efficient scheduling of operations for large, complex smallsat constellations. Future work is discussed that promises further scalability and schedule quality increases from the algorithm architecture presented.
by Andrew Kitrell Kennedy.
Ph. D. in Space Systems
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Wallace, Scott Thomas. "Parallel orbit propagation and the analysis of satellite constellations." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/46444.
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Soares, Diogo Lopes. "Design of multidimensional compact constellations with high power efficiency." Master's thesis, Faculdade de Ciências e Tecnologia, 2013. http://hdl.handle.net/10362/11111.
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Pahwa, Samir. "The theory of simultaneous lifting : constellations in conflict hypergraphs." Thesis, Manhattan, Kan. : Kansas State University, 2009. http://hdl.handle.net/2097/2317.
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Dalla, Costa Murilo José Farias. "Significações mortuárias da série Les constellations de Joan Miró." reponame:Repositório Institucional da UFSC, 2012. http://repositorio.ufsc.br/xmlui/handle/123456789/100639.
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Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Comunicação e Expressão, Programa de Pós-Graduação em Literatura, Florianópolis, 2012Made available in DSpace on 2013-06-25T21:08:56Z (GMT). No. of bitstreams: 1 312420.pdf: 1982562 bytes, checksum: fb022ff66808f9f254d474ef07f65ed1 (MD5)
Não há estudos aprofundados sobre a série Constelações (1940-1941) de Joan Miró (1893-1983). O caráter hermético das pinturas pode ser considerado uma das causas do silêncio crítico sobre a série. Nesta investigação, propomos a hipótese, a partir da análise dos documentos disponíveis, de que a dispersão da série depois de sua chegada aos Estados Unidos em meados da década de 1940 prejudicou a recepção das Constelações, pois, segundo a idéia inicial de Miró, a série de pinturas deveria ter sido integralmente adquirida pelo Museum of Modern Art (MoMA), o que garantiria a sua exposição de maneira permanente na sede da prestigiosa instituição de Nova York. A investigação também sugere que o Guernica de Pablo Picasso tenha sido uma das motivações secretas das Constelações, idealizadas por Miró como uma alternativa estética ao tratamento do tema da guerra na Arte, epitomado pelo célebre painel de Picasso. Le bel oiseau déchiffrant l'inconnu au couple d'amoureux, o vigésimo quadro da série, destaca-se dos demais por apresentar características peculiares à série, que permitem a identificação de temas e personagens do imaginário do artista, constituindo uma chave de acesso ao significado oculto das Constelações de Joan Miró e suas relações com a Cabala hebraica.
Abstract : There are no detailed studies about the Constellations series (1940-1941) by Catalan artist Joan Miró (1893-1983). The hermetic character of the paintings can be considered one of the causes of the critical silence about the series. In this research, we propose the hypothesis that the dispersion of the series after its arrival to the United States in the mid-1940s hampered the appraisal of the Constellations by critics and public, inasmuch as the initial idea of Miró was taht the series should have been fully acquired by the Museum of Modern Art (MoMA), which would had ensured its permanent display at the prestigious institution in New York. The research suggests that the Guernica by Pablo Picasso could be considered one of the secret motivations of Constellations, devised by Miró as an alternative to the aesthetic treatment of the theme of war in the Arts, epitomized by the celebrated panel by Picasso. Le bel l'oiseau déchiffrant l'inconnu au couple d'amoureux, the twentieth painting of the series, stands out from the others pictures of the suite by presenting peculiar features that enables the identification of themes and characters of the imagery of the artist, providing a key access to the hidden meaning of the Constellations of Joan Miró and its ignored relation with the Hebrew Kabbalah.
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Contreras-Koterbay, Scott, and Łukasz Mirocha. "The New Aesthetic and Art: Constellations of the Postdigital." Digital Commons @ East Tennessee State University, 2016. https://dc.etsu.edu/etsu_books/112.
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The case for the new aesthetic -- Manifestations of the new aesthetic -- Glitch ontology and the new aesthetic -- Setting the stage : the new precursorsand boundaries for a new aesthetic art -- Letting go : new aesthetic artists and the new aesthetic art that works -- Teleology and the new aesthetic -- Conclusion -- References -- Biographies.
"The new aesthetic and art: constellations of the postdigital is an interdisciplinary analysis focusing on new digital phenomena at the intersections of theory andcontemporary art. Asserting the unique character of New Aesthetic objects, Contreras-Koterbay and Mirocha trace the origins of the New Aesthetic in visual arts, design, and software, find its presence resonating in various kinds of digital imagery, and track its agency in everyday effects of the intertwined physical world and the digital realm. Contreras-Koterbay and Mirocha bring to light an original perspective that identifies an autonomous quality in common digital objects and examples ofart that are increasingly an important influence for today's culture and society."https://dc.etsu.edu/etsu_books/1118/thumbnail.jpg
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Leber, Deanne. "Constellations – a space in time that’s filled with moving." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2016. https://ro.ecu.edu.au/theses/1810.
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Constellations in the sky have been a source of inspiration, in both science and literature, for aeons. Working within the constraints of the ‘official’ 88 constellations, as devised by the International Astronomical Union, this study involved researching the myths and histories of constellations, and then creating a collection of poems based upon those. Thematic connections between the eight modern constellation “families” or groups of constellations were explored and it is in these groupings that the poems work, to tie together, through experimentations with language, a somewhat cohesive fabric of poetry.
Each constellation consists of three poems. The first is a dense prose poem. The poem is then reconfigured, containing elements of the old prose poem, but offering new associations and meanings as punctuation and words are removed. The third and final poem reflects the actual constellation shape, as observed in star maps. It is a movement of poetic archaeology, with new poems emerging through excavation of the first two pages. The poems challenge notions of language, such as closure, dealing with repetitions, renewal and discontinuous narrative threads. There is an element of play with the work, and the final page encourages reading beyond the left to right formation of conventional reading structures, instead making connections to be traversed in an improvised reading process.
The poems are presented as four pages for each constellation. Three pages are the poems, and the fourth page, on the reverse of the final constellation shape, is the actual constellation map. The pages are clipped and folded into a black storage box. This design is to encapsulate the feeling of discovering a box of maps, with the folding and unfolding process aimed at being part of the play involved in reading and discovering the poems.
Accompanying the box is a Powerpoint presentation on a USB stick. This is a ‘Twitter’ type feed, where a one sentence epigraph, derived from the beginning of each constellation, is inscribed in a continuous feed, in an attempt to illustrate the futility of trying to comprehend and keep up with an endlessly shifting landscape of words online, and in particular, in social media. The 88 phrases revolve aimlessly across the screen. It becomes a blank space, littered with odd words and phrases, recognizable but fleeting The accompanying exegesis discusses language, mapping and orienteering. It explores theoretical concerns in poetry and language, and how, by looking at constellations and the way we interpret them, that they can be seen as metaphors for the way the constellation poems have been created.
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ZANETTE, LUCA. "Communication Networks in CubeSat Constellations: Analysis, Design and Implementation." Doctoral thesis, Politecnico di Torino, 2018. http://hdl.handle.net/11583/2704132.
Full textAbstract:
CubeSat constellations are redefining the way we approach to space missions, from
the particular impact on scientific mission possibilities, constellations potential is
growing with the increasing accessibility in terms of low development and launch
costs and higher performances of the available technologies for CubeSats.
In this thesis we focus on communication networks in CubeSat constellations: the
project consist of developing a clustering algorithm able to group small satellites
in order to create an optimized communication network by considering problems
related to mutual access time and communication capabilities we reduce the typical
negative effects of clustering algorithms such as ripple effect of re-clustering and
optimizing the cluster-head formation number.
The network creation is exploited by our proposed hardware system, composed
by a phased array with up to 10dB gain, managed by a beamforming algorithm,
to increase the total data volume transferable from a CubeSat constellation to the
ground station. The total data volume earned vary from 40% to a peak of 99% more,
depending on the constellation topology analyzed.
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Löf, Emma, and Malin Löf. "The Relations between Gender Roles, Sibling Constellations, and Modern Sexism." Thesis, Örebro universitet, Institutionen för juridik, psykologi och socialt arbete, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-65469.
Full textAbstract:
In this study we investigated the relations between gender roles, siblings and sexism. We wanted to know if boys who spent more time with their sisters were less sexist than those who did not. Another question we asked was if girls who identified with their traditional gender roles were more sexist than those who did not. We sampled 127 high school students in the ages of 15 to 19. The results showed that time spent with sisters among boys, did not significantly correlate with sexism. However boys were more sexist than girls. Girls who identified with their traditional gender roles were less sexist than those who did not. Another important finding was that boys not identifying with the feminine gender role were more sexist than those who did. In conclusion, Contact with sisters did not have a relation to boys being sexist. However, gender and gender roles did. Unexpected findings included the importance of the feminine gender role. Where not identifying with feminine gender role traits for boys showed higher tendencies for sexism. Whereas girls who identified with the feminine traits showed lower tendencies for sexism.I denna studie undersökte vi relationen mellan könsroller, syskon och sexism. Vi ville veta om pojkar som spenderade mer tid med sina systrar var mindre sexistiska än dem som inte gjorde det. En annan fråga vi undersökte var om flickor som identifierade sig med sin traditionella könsroll var mer sexistiska än dem som inte gjorde det. Vårt urval bestod av 127 gymnasieelever i åldrarna 15 till 19 år. Resultaten visade att tid spenderad med systrar inte var signifikant korrelerat med sexism bland pojkar. Däremot var pojkar mer sexistiska än flickor. Flickor som identifierade sig med sin traditionella könsroll var mindre sexistiska än de som inte gjorde det. En annan viktig upptäckt var att pojkar som inte identifierade sig med den feminina könsrollen var mer sexistiska än de som gjorde det. Sammanfattningsvis, kontakt med systrar hade ingen relation till pojkars sexism. Däremot, hade kön och könsroller det. Oväntade resultat visade betydelsen av den feminina könsrollen där pojkar som inte identifierade sig med den feminina könsrollens egenskaper visade högre tendenser till sexism, medan flickor som identifierade sig med dessa egenskaper visade mindre tendenser till sexism.
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Santos, Michel. "Improving the coverage of earth targets by maneuvering satellite constellations." College Park, Md. : University of Maryland, 2007. http://hdl.handle.net/1903/7328.
Full textAbstract:
Thesis (Ph. D.) -- University of Maryland, College Park, 2007.Thesis research directed by: Aerospace Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Paek, Sung Wook. "Reconfigurable satellite constellations for geo-spatially adaptive Earth observation missions." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/76106.
Full textAbstract:
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2012.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 145-151).
Continuously increasing demand for Earth observation in atmospheric research, disaster monitoring, and intelligence, surveillance and reconnaissance (ISR) has been met by responsive architectures such as unmanned aerial systems (UAS) or artificial satellites. Space-based architectures can provide non-dominated design solutions on the utility-cost curve compared to alternate architectures through the use of two approaches: (1) reducing satellite manufacturing and launch costs and (2) introducing reconfigurability to the satellite constellations. Reconfigurable constellations (ReCons) enable fast responses to access targets of interest while providing global monitoring capability from space. The wide-area coverage and fast responses provided ReCon can complement high-resolution imagery provided by UAS. A newly proposed ReCon framework improves the model fidelity of previous approaches by utilizing Satellite Tool Kit (STK) simulations and Earth observation mission databases. This thesis investigates the design and optimization of ReCon in low Earth orbits. A multidisciplinary simulation model is developed, to which optimization techniques are applied for both single-objective and multi-objective problems. In addition to the optimized baseline ReCon design, its variants are also considered as case studies. Future work will potentially co-optimize ReCon and UAS-like systems.
by Sung Wook Paek.
S.M.