Thèses sur le sujet « Explorers and exploration »
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Dritsas, Lawrence Stratton. « Local Informants and British Explorers : the Search for the Source of the Nile, 1850-1875 ». Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/35306.
Texte intégralMaster of Science
Murray, Katie. « Memorials of endurance and adventure : exhibiting British polar exploration, 1819-c.1939 ». Thesis, University of St Andrews, 2017. http://hdl.handle.net/10023/11087.
Texte intégralLiegel, Roy 1940. « Paradigms of experiencing the new in Pacific voyages and explorations ». Monash University, German Studies, 2001. http://arrow.monash.edu.au/hdl/1959.1/9156.
Texte intégralTeo, Leonghwee. « Modeling Goal-Directed User Exploration in Human-Computer Interaction ». Research Showcase @ CMU, 2011. http://repository.cmu.edu/dissertations/681.
Texte intégralGauss, Veronica A. « A fuzzy logic solution for navigation of the Subsurface Explorer planetary exploration robot ». Thesis, This resource online, 1997. http://scholar.lib.vt.edu/theses/available/etd-08222008-063102/.
Texte intégralTremblay, Pierre-Jules. « The skeptical explorer : a multiple-hypothesis approach to visual modelling and exploration ». Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape10/PQDD_0007/MQ44046.pdf.
Texte intégralMatheron, Guillaume. « Integrating motion planning into reinforcement learning to solve hard exploration problems ». Electronic Thesis or Diss., Sorbonne université, 2020. http://www.theses.fr/2020SORUS348.
Texte intégralMotion planning is able to solve robotics problems much quicker than any reinforcement learning algorithm by efficiently searching for a viable trajectory. Indeed, while the main object of interest in the field of Reinforcement Learning is the behavior of an agent, Motion Planning is concerned with the geometry and properties of the state-space, and uses a different set of primitives to achieve more efficient exploration. Some of these primitives require a model of the system and are not studied in this work, others such as reset-anywhere are only available in simulated environments. In contrast, Motion Planning approaches do not benefit from the same generalization properties as the policies produced by reinforcement learning. In this thesis, we study the ways in which techniques inspired from motion planning can speed up the solving of hard exploration problems for reinforcement learning without sacrificing the advantages of model-free learning and generalization. We identify a deadlock that can occur when applying reinforcement learning to seemingly-trivial sparse-reward problems, and contribute an exploration algorithm inspired by motion planning but specifically designed for reinforcement learning environments, as well as a framework to use the collected data to train a reinforcement learning algorithm in previously-intractable scenarios
Costa, Vianna Maria Luiza. « A Geometrical Approach to Estimate the Coverage Measure of the Area Explored by a Robot ». Electronic Thesis or Diss., Institut polytechnique de Paris, 2023. http://www.theses.fr/2023IPPAX115.
Texte intégralMobile robots are increasingly being deployed across different domains. These robots find applications in domestic settings, as well as in agriculture, where they enable precision farming, and logistics, ensuring the efficient transportation of materials and goods. Moreover, they play crucial roles carrying out a wide range of challenging tasks that would be too dangerous or difficult for humans, being pivotal in area-covering missions.Area-covering missions refer to tasks where the primary objective is to systematically traverse and explore a defined area, leaving no region unexamined. Additionally, they are often undertaken in environments that pose significant risks to human operators, such as minefields or disaster-stricken areas. In this context, examples of safety-critical area-covering missions are Mine Countermeasure (MCM) missions and Search and Rescue (SAR) operations.Accurate knowledge of the area explored by a mobile robot is crucial for assessing the completeness of these missions. Some applications might also require the robot to revisit an area of interest, in this case, to verify the completion a mission, one has to be capable of determining how many times each part of the space has been in the robot's range of detection.In this context, we introduce the concept of coverage measure, that represents how many times a part of the environment was explored by a mobile robot during a mission. In adition to evaluating revisiting missions, the coverage measure is also useful for path optimization and it can be valuable for improving the efficiency of localization algorithms in homogeneous environments, such as the underwater environment.Furthermore, we establish a relation between the coverage measure and the topological degree. This relation allows us to propose a novel approach for estimating the explored area based on topological properties of the environment that has been observed. Uncertainty associated to the mission in noisy environments is taken into consideration through the use of interval analysis in the problem formalization.The theory and the algorithms developed in this thesis are illustreated through real world experiments in the marine environment
Bergqvist, Tomas. « To explore and verify in mathematics ». Doctoral thesis, Umeå universitet, Institutionen för matematik och matematisk statistik, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-9345.
Texte intégralLa, Tour Paul A. (Paul Alexis). « Combining tradespace exploration with system dynamics to explore future space architectures ». Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/106593.
Texte intégralSome pages printed landscape orientation. Cataloged from PDF version of thesis.
Includes bibliographical references (pages 342-351).
This work proposes a merger of Tradespace Exploration with System Dynamics modeling techniques in a complementary approach. It tests the value of this mixed method for modeling the multiplicity of inputs and complexity of feedback loops that affect the cost, schedule and performance of satellite constellations within the Department of Defense. The resulting simulation enables direct comparison of the effect of changing architectural design points and policy choices with respect to satellite acquisitions and fielding. A generation-over-generation examination of policy choices is made possible through the application of soft systems modeling of experience and learning effects. The resulting model enables examination of possible futures given variations in assumptions about both internal and external forces on a satellite production pipeline. This thesis performs a policy analysis examining the current path of the Global Positioning System acquisition and compares it to equivalent position navigation and timing capability delivered through a variety of disaggregated options while varying: design lives, production quantities, non-recurring engineering and time between generations. The extensibility of this technique is investigated by adapting the model to the mission area of Weather and Climate Sensing. This thesis then performs a policy analysis examining different disaggregated approaches for the Joint Polar Satellite, focusing on the impact of complexity. Discussion of factors such as design choices, context variables, tuning variables, model execution and construction is also included.
by Paul A. La Tour.
Ph. D. in Engineering Systems
Boërio, Delphine. « Excitabilité neuromusculaire et fatigue à l'effort : exploration neurophysiologique et application à la pathologie ». Paris 12, 2006. https://athena.u-pec.fr/primo-explore/search?query=any,exact,990002464060204611&vid=upec.
Texte intégralThe present work focused on electrophysiological assessment of neuromuscular excitability and effort-related fatigability in healthy humans and patients. Non-invasive techniques have been developed in this goal, to appraise the pathophysiological mechanisms involved at cortical, spinal, neural or muscular level. Following validation in healthy subjects, these tests have been applied to patients who suffered from disease affecting the central or the peripheral nervous system (multiple sclerosis, neuropathies) or the skeletal muscle (myotonic dystrophy). The results have been interpreted to enlighten the potential pathophysiological causes of such diseases. These studies are not painful and can be rapidly performed with a good repetability, authorizing their future application to ensure long-term follow-up and assessment of therapy in neurophysiological practice
Gales, Mathis. « Collaborative map-exploration around large table-top displays : Designing a collaboration interface for the Rapid Analytics Interactive Scenario Explorer toolkit ». Thesis, Ludwig-Maximilians-University Munich, 2018. https://eprints.qut.edu.au/115909/1/Master_Thesis_Mathis_Gales_final_opt.pdf.
Texte intégralGillet, Kévin. « Explorer les hétérogénéités de petite échelle de la lune et de la terre ». Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30310/document.
Texte intégralDuring their propagation, seismic waves are attenuated by two phenomena: on one hand, absorption caused by the anelastic properties of the materials, and on the other hand, scattering caused by the presence of small-scale heterogeneities in the medium. The aim of this thesis is to map the properties of scattering and absorption of seismic waves in two extreme geophysical contexts with very different spatial scales. The first part of this memoir is devoted to the stratification of heterogeneities in the Moon. We use a new diffusion model in spherical geometry to invert measurements of the time of arrival of the maximum of energy and the seismic coda decay on data from the Apollo missions. Our inversions provide evidence of a very sharp contrast of scattering properties between the highly attenuating megaregolith and the transparent deep lunar mantle. Attenuation is largerly dominated by scattering and suggests the presence of fractures down to about 100 km depth, into the mantle. A new method for estimating the depth of shallow moonquakes based on diffusive signals was developped and confirms the existence of active faults around 50 km deep. The second part of this thesis is devoted to the attenuation structure of Taiwan, a region with a wide variety of geological structures in the context of two subduction zones. We use the MLTWA (Multiple Lapse Time Window Analysis) -a method based on the ratio between the coherent and incoherent energy of the seismic signal- to image the lateral variations of attenuation. We worked first with the classical hypothesis of isotropic scattering in a half-space. Our results provide evidence for a globally high level of attenuation with sharp contrasts of scattering properties across small spatial scales, of the order of 10-20 km. Scattering is particularly strong in the basins of the west coast, southern Taiwan and the eastern Coastal Range associated with the collision with the Luzon volcanic arc. Absorption increases gradually eastwards and reaches a maximum below the volcanic arc. A posteriori examination of the fit between data and model shows unambiguously the limits of the hypothesis of isotropic scattering in a half-space for a number of stations located along the coasts. This leads us to explore the effects of anisotropic scattering in a guide for seismic waves representing the crust. Taking anisotropy into account significantly improves the fitness of the model to the data. In particular, at low frequency (1-2 Hz), our study shows the prevalence of backscattering. This result is compatible with the presence of sharp contrasts of impedance in the crust and suggests the strong presence of fluids in fault zones and volcanoes in Taiwan. The measurement of scattering anisotropy opens new perspectives for characterizing small-scale geophysical heterogeneities
Pinaire, Jessica. « Explorer les trajectoires de patients via les bases médico-économiques : application à l'infarctus du myocarde ». Thesis, Montpellier, 2017. http://www.theses.fr/2017MONTS020/document.
Texte intégralWith approximately 120,000 people affected each year, 12,000 deaths from the first crisis and 18,000 deaths after one year, myocardial infarction is a major public health issue. This pathology requires hospitalization and management in an intensive care cardiology unit. We study this pathology using the French national Prospective Paiement System (PPS) databases.The collection of national hospital data within the framework of the PPS generates about 25 million records per year.These data, which are initially collected for medico-economic purposes, contain information that may have other purposes: improving patient care, predicting the evolution of care, planning their costs, etc.Another emerging issue is that of providing tools for exploring patients' hospital trajectories using data from the PPS. Through several objectives, this thesis aims to suggest tools combining methods from three disciplines: medical computing, data mining and biostatistics.We make four contributions.The first contribution concerns the constitution of a quality database to analyze patient trajectories. The second contribution is a semi-automatic method for the systematic review of the literature. This part of the work delineates the contours of the trajectory concept in the biomedical field. The third contribution is the identification of care trajectories in the prediction of intra-hospital death. Our research strategy is divided into two phases: 1) Identification of typical patient trajectories using data mining tools; 2) Construction of a prediction model from these trajectories to predict death. Finally, the last contribution is the characterization of patient flows through the various hospital events, also considering of delays and costs. In this contribution, we propose a combined-data mining and a longitudinal data clustering technique
Balikas, Georgios. « Explorer et apprendre à partir de collections de textes multilingues à l'aide des modèles probabilistes latents et des réseaux profonds ». Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAM054/document.
Texte intégralText is one of the most pervasive and persistent sources of information. Content analysis of text in its broad sense refers to methods for studying and retrieving information from documents. Nowadays, with the ever increasing amounts of text becoming available online is several languages and different styles, content analysis of text is of tremendous importance as it enables a variety of applications. To this end, unsupervised representation learning methods such as topic models and word embeddings constitute prominent tools.The goal of this dissertation is to study and address challengingproblems in this area, focusing on both the design of novel text miningalgorithms and tools, as well as on studying how these tools can be applied to text collections written in a single or several languages.In the first part of the thesis we focus on topic models and more precisely on how to incorporate prior information of text structure to such models.Topic models are built on the premise of bag-of-words, and therefore words are exchangeable. While this assumption benefits the calculations of the conditional probabilities it results in loss of information.To overcome this limitation we propose two mechanisms that extend topic models by integrating knowledge of text structure to them. We assume that the documents are partitioned in thematically coherent text segments. The first mechanism assigns the same topic to the words of a segment. The second, capitalizes on the properties of copulas, a tool mainly used in the fields of economics and risk management that is used to model the joint probability density distributions of random variables while having access only to their marginals.The second part of the thesis explores bilingual topic models for comparable corpora with explicit document alignments. Typically, a document collection for such models is in the form of comparable document pairs. The documents of a pair are written in different languages and are thematically similar. Unless translations, the documents of a pair are similar to some extent only. Meanwhile, representative topic models assume that the documents have identical topic distributions, which is a strong and limiting assumption. To overcome it we propose novel bilingual topic models that incorporate the notion of cross-lingual similarity of the documents that constitute the pairs in their generative and inference processes. Calculating this cross-lingual document similarity is a task on itself, which we propose to address using cross-lingual word embeddings.The last part of the thesis concerns the use of word embeddings and neural networks for three text mining applications. First, we discuss polylingual document classification where we argue that translations of a document can be used to enrich its representation. Using an auto-encoder to obtain these robust document representations we demonstrate improvements in the task of multi-class document classification. Second, we explore multi-task sentiment classification of tweets arguing that by jointly training classification systems using correlated tasks can improve the obtained performance. To this end we show how can achieve state-of-the-art performance on a sentiment classification task using recurrent neural networks. The third application we explore is cross-lingual information retrieval. Given a document written in one language, the task consists in retrieving the most similar documents from a pool of documents written in another language. In this line of research, we show that by adapting the transportation problem for the task of estimating document distances one can achieve important improvements
Paleologos, Esther, et esther paleologos@rmit edu au. « An exploration of new processes and products for knitted textiles : this research will explore the combination of standard and non-standard fibres and finishing processes to create three-dimensional and sculptural knitted fabric structures, while expanding the potential of domestic machine knitting to be viewed as an art form ». RMIT University. Fashion & ; Textiles, 2010. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20100329.143129.
Texte intégralErceg, Diane. « Explorers of a Different Kind : A History of Antarctic Tourism 1966-2016 ». Phd thesis, 2017. http://hdl.handle.net/1885/132936.
Texte intégralStarbuck, Nicole. « Constructing the "perfect" voyage : Nicolas Baudin at Port Jackson, 1802 ». 2010. http://hdl.handle.net/2440/60141.
Texte intégralThesis (Ph.D.) -- University of Adelaide, School of Humanities, 2010
Hoolihan, Tanya Louise. « Beyond exploration : illustrating the botanical legacy of the German/Australian explorer Friedrich Wilhelm Ludwig Leichhardt based on his written observations, letters and herbarium specimens 1842-1844 ». Thesis, 2018. http://hdl.handle.net/1959.13/1395086.
Texte intégralLudwig Leichhardt is synonymous with Australian exploration, yet his achievements extend well beyond the success of his overland expeditions. Beyond exploration, Leichhardt was a passionate observer of Australian natural history, who left a significant legacy of collected and written material, especially in the field of botany. The recent translations of his diaries recorded between 1842 and 1844 have exposed a lesser known period of Leichhardt’s life and helped to evidence him as a capable and diligent scientist. The published materials combined with Leichhardt’s collected plant specimens establish the foundation for my research and have subsequently informed my outcomes. From my research I have painted a series of botanical illustrations depicting specimens that were observed, recorded and collected by Leichhardt more than 170 years ago. The documentation of this research and creative methodology from field observations through to the final illustrations visually depicts Leichhardt’s historical contribution to Australian botanical science while providing information on creative process to botanical illustrators.
Starbuck, Nicole. « Constructing the "perfect" voyage : Nicolas Baudin at Port Jackson, 1802 ». Thesis, 2010. http://hdl.handle.net/2440/60141.
Texte intégralThesis (Ph.D.) -- University of Adelaide, School of Humanities, 2010
Chao-Yu, Hung, et 洪肇佑. « Exploration of VGA Mobilephone Camera Lens Design with Global Explorer Optimization ». Thesis, 2007. http://ndltd.ncl.edu.tw/handle/10403342886921123732.
Texte intégral國立交通大學
光電工程系所
95
We explore the mobilephone camera lens with typical VGA sensor format by global explorer (GE) optimization. Besides that use GE to design the two-element system, we first deduce the basic lens forms as the initial approach. Physically different merit functions have been set to explore how the best performance could be achieved. On the other hand ,we identify the improvement that can be achieved by GE.
Hassall, Cameron Dale. « The neural correlates of exploration ». Thesis, 2019. http://hdl.handle.net/1828/11074.
Texte intégralGraduate
Garceau, Simon. « La fiction en réalité virtuelle : une approche de recherche-création pour explorer le potentiel narratif et poétique d’une œuvre à 360° ». Thesis, 2019. http://hdl.handle.net/1866/24298.
Texte intégralLe dispositif connu du public sous l'appellation "réalité virtuelle" propose une expérience multisensorielle qui encourage à repenser nos habitudes de perception spectatorielle. Avec le volet recherche, j’élabore une réflexion sur la représentation du réel au cinéma pour mieux cerner le rapport qu’entretient le spectateur avec l’image. Menée dans un souci d’envisager conjointement « récit » et « dispositif », la perspective qui est la nôtre consiste à se pencher sur le processus de collaboration du spectateur et à examiner comment, avec la réalité virtuelle, le « pacte de représentation » et le « cognitivisme spectatoriel » se voient bouleversés. Pour cela, nous élargirons notre étude en nous appuyant sur les aspects techniques de la réalité virtuelle relatifs au photoréalisme et à l’immersion sensorimotrice. Le volet création — qui prend la forme d’un court-métrage en réalité-virtuelle — explore le thème de l’art de la mémoire à partir de l’étude de certains lieux réels qui l’abrite. L’histoire se déroule dix ans après qu’un événement d’origine inconnu ait décimé la population mondiale. Estéban, qui a survécu au mal mystérieux alors qu’il était enfant, entame une exploration des paysages architecturaux désormais en ruine, il parviendra à trouver une passion dans la photographie. Le procédé narratologique de « mise en abyme » utilisé dans ce court-métrage nous fournira une première clé pour ouvrir des pistes vers une réflexion sur la fictionnalisation dans son rapport avec d’autres phénomènes artistiques et représentationnels, notamment la pratique contemporaine appelé « urbex ».
The device known to the public as "virtual reality" offers a multisensory experience that encourages rethinking our habits of spectator perception. With the research component, I develop a reflection on the representation of reality in the cinema to better understand the relationship between the viewer and the image. Conducted with a view to jointly considering "narrative" and "device" our perspective is to look at the process of collaboration of the viewer, and to examine how with virtual reality, the "pact of representation" and the "spectatorial cognitivism" are upset. To do this, we will expand our study by relying on the technical aspects of virtual reality related to photorealism and sensorimotor immersion. The creation component, which takes the form of a short film in virtual reality, will explore the theme of the art of memory from the study of some real places that shelters it. The story takes place 10 years after an event of unknown origin decimated the world's population. Estéban, who survived the mysterious evil as a child, begins an exploration of architectural landscapes now in ruins, he will find a passion in photography. The narratological process of "mise en abyme" used in this short film will provide us with a first key to open avenues towards a reflection on fictionalization in its relationship with other artistic and representational phenomena, notably the contemporary practice called "urbex". .
Lomba, Marisa Filipa Pimenta. « Conhecimento do mundo : explorar e descobrir o mundo físico na creche e no jardim de infância ». Master's thesis, 2013. http://hdl.handle.net/1822/28858.
Texte intégralEste relatório apresenta o projeto de intervenção pedagógica desenvolvido nos contextos de creche e jardim de infância no âmbito da Unidade Curricular, Prática de Ensino Supervisionada, inserida no plano de estudos do Mestrado em Educação Pré-Escolar, da Universidade do Minho, que permitiu proporcionar às crianças um conjunto de atividades relacionadas com a abordagem ao conhecimento do mundo físico. O projeto de intervenção num e noutro contexto partiu da observação e interação com o grupo de crianças e reflexão com as educadoras cooperantes, estes processos permitiram conhecer e compreender o contexto educativo, identificar os interesses e necessidades das crianças e desenvolver uma intervenção pedagógica intencional, sustentada nos mesmos, assim como, promover um ambiente de aprendizagem ativa. O projeto desenvolvido em ambos os contextos foi resultado dos interesses das crianças, desta forma o projeto visou responder aos mesmos, ampliando a sua curiosidade e desejo de saber mais acerca do mundo físico, através da criação de oportunidades de exploração, experimentação e descoberta, desenvolvendo uma aprendizagem ativa. No jardim de infância as estratégias pedagógicas relacionaram-se com o desenvolvimento de atividades experimentais e a inclusão de uma área das ciências e experiências. As crianças tiveram oportunidade de explorar, manipular e experimentar diversos objetos e materiais e fazer novas descobertas acerca dos fenómenos naturais, favorecendo o interesse e gosto pelas ciências físicas. A intervenção contribuiu para as crianças desenvolverem novos conhecimentos acerca dos fenómenos físicos, assim como, promoveu o desenvolvimento de algumas competências e atitudes ligadas às ciências. Em creche as estratégias de intervenção relacionaram-se com o desenvolvimento de atividades de exploração de materiais e objetos. Às crianças foram proporcionadas atividades de exploração e manipulação que permitiram o contacto com novos e diferentes materiais e objetos, bem como, promoveram a observação atenta e a participação ativa em fenómenos do quotidiano, tornando possível a construção de novos conhecimentos acerca do mundo que as rodeia e apoiar a curiosidade e o desejo de saber acerca do mesmo.
This report presents a pedagogical intervention project developed in the day care and kindergarten context regarding the Practical Curricular, Unit of Supervised Teaching Practice, which is part of the Master’s study plan for Preschool Education in University of Minho. It provided the children with a set of activities related to the approach of physical world knowledge. The intervention project in one and other contexts came from the observation and interaction with the group of children and from the reflection with the cooperating teachers. These processes made it possible to know and understand the educational context, to identify the children´s interests and needs and to develop an intentional pedagogical intervention, based upon the children, and to promote an active learning environment. The project developed in both contexts resulted from the children’s interests, aiming to fulfill them, widening their curiosity and their desire to know more about the physical world, through the creation of exploration opportunities, experiments and discovery, developing an active learning. The pedagogical strategies in kindergarten had to do with the development of experimental activities and the introduction of a science and experiments topic area. The children had the opportunity to explore, manipulate and experiment several objects and materials and to make new discoveries about natural phenomena, increasing the interest and pleasure in physical sciences. The intervention allowed the children to develop new knowledge about physical phenomena, and promoted the development of certain skills and attitudes towards the science. In day care, the intervention strategies had to do with the development of activities related to the exploring of materials and objects. The children were provided with exploration and manipulation activities. These provided contact with new and different materials and objects. They also promoted the careful observation and the active participation in daily phenomena, making the construction of new knowledge of their surrounding world possible, and supporting the curiosity and desire to know more about it.