Tesi sul tema "Sourves"
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Feideropoulou, Georgia. "Codage Conjoint Source-Canal des Sources Vidéo". Phd thesis, Télécom ParisTech, 2005. http://pastel.archives-ouvertes.fr/pastel-00001294.
Testo completoFeideropoulou, Georgia. "Codage conjoint source-canal des sources vidéo /". Paris : École nationale supérieure des télécommunications, 2005. http://catalogue.bnf.fr/ark:/12148/cb40021763z.
Testo completoO'Neill, Meagan. "Source Memory Failures: Comparing Source Misattribution to Sources of False Memories". Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/78099.
Testo completoMaster of Science
Franco, Bedoya Oscar Hernán. "Open source software ecosystems quality analysis from data sources". Doctoral thesis, Universitat Politècnica de Catalunya, 2018. http://hdl.handle.net/10803/462101.
Testo completontecedentes: el software de código abierto (OSS, por sus siglas en inglés) y los ecosistemas de software (SECOs, por sus siglas en inglés) son dos áreas de investigación consolidadas en ingeniería de software. La adopción de OSS por parte de empresas, gobiernos, investigadores y profesionales se ha incrementado rápidamente en las últimas décadas, y, en consecuencia, todos ellos hacen parte de un nuevo tipo de ecosistema formado por comunidades de software, fundaciones, desarrolladores y socios denominado ecosistema de software de código abierto. (OSSECO, por sus siglas en inglés)). Para realizar una evaluación sistemática de la calidad de un SECO, es necesario definir ciertos tipos de elementos concretos. Esto significa que tanto las métricas como las evaluaciones deben ser descritos (por ejemplo, a través de datos históricos o el conocimiento de expertos). La evaluación de la calidad de un OSSECO puede ser de utilidad desde diferentes perspectivas, por ejemplo: los que adoptan los productos del OSSECO pueden querer conocer la vitalidad del OSSECO (por ejemplo, el número de actualizaciones recientes); los desarrolladores de software pueden querer saber sobre la actividad del OSSECO (por ejemplo, cuántos colaboradores están involucrados y qué tan activos son); incluso la propia comunidad del OSSECO para conocer el estado de salud del OSSECO (por ejemplo, si está evolucionando en la dirección correcta). Sin embargo, los enfoques actuales para evaluar la calidad del software (incluso aquellos específicos para el software de código abierto) no cubren todos los aspectos relevantes en un OSSECO desde una perspectiva ecosistémica. Objetivo: El objetivo principal de esta tesis doctoral es apoyar la evaluación de la calidad de OSSECO mediante el diseño de un marco de trabajo que ayude a la evaluación de la calidad de un OSSECO. Métodos: Para lograr este objetivo, hemos utilizado un enfoque basado en la metodología design science propuesta por Wieringa [1]. Adicionalmente, nos hemos basado en la caracterización de la ingeniería de software propuesta por M. Shaw [2], con el fin de construir un conjunto de artefactos que contribuyan en la evaluación de la calidad de un OSSECO y para conocer los efectos del uso de estos artefactos en la práctica. Resultados: Hemos realizado un mapeo sistemático para caracterizar los OSSECOs y hemos diseñado el marco de trabajo denominado QuESo (es un marco de trabajo para evaluar la calidad de los OSSECOs). QuESo a su vez está compuesto por tres artefactos: (i) QuESo-model, un modelo de calidad para OSSECOs; (ii) QuESo-process, un proceso para llevar a cabo las evaluaciones de calidad de OSSECOs utilizando el modelo QuESo; y (iii) QuESo-tool, un conjunto de componentes de software que apoyan la evaluación de calidad de los OSSECOs de manera semiautomática. QuESo ha sido validado con un estudio de caso sobre Eclipse. Conclusiones: esta tesis ha contribuido a aumentar el conocimiento y la comprensión de los OSSECOs, y tambien ha apoyado la evaluación de la calidad de los OSSECOs
Albertson, Fredrik. "Acoustic source characterisation for non-linear in-duct sources /". Stockholm, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3187.
Testo completoLatif, Mohamed Amin. "Localization of brain signal sources using blind source separation". Thesis, Cardiff University, 2006. http://orca.cf.ac.uk/54567/.
Testo completoWu, Zhenyu, Ali Bilgin e Michael W. Marcellin. "JOINT SOURCE/CHANNEL CODING FOR TRANSMISSION OF MULTIPLE SOURCES". International Foundation for Telemetering, 2005. http://hdl.handle.net/10150/604932.
Testo completoA practical joint source/channel coding algorithm is proposed for the transmission of multiple images and videos to reduce the overall reconstructed source distortion at the receiver within a given total bit rate. It is demonstrated that by joint coding of multiple sources with such an objective, both improved distortion performance as well as reduced quality variation can be achieved at the same time. Experimental results based on multiple images and video sequences justify our conclusion.
Naqvi, Syed Mohsen Raza. "Multimodal methods for blind source separation of audio sources". Thesis, Loughborough University, 2009. https://dspace.lboro.ac.uk/2134/36117.
Testo completoSouviraà-Labastie, Nathan. "Détection de motifs audio pour la séparation de sources guidée : application aux bandes-son de films". Thesis, Rennes 1, 2015. http://www.theses.fr/2015REN1S174.
Testo completoIn audio signal processing, source separation consists in recovering the different audio sources that compose a given observed audio mixture. They are many techniques to estimate these sources and the more information are taken into account about them the more the separation is likely to be successful. One way to incorporate information on sources is the use of a reference signal which will give a first approximation of this source. This thesis aims to explore the theoretical and applied aspects of reference guided source separation. The proposed approach called SPOtted REference based Separation (SPORES) explore the particular case where the references are obtained automatically by motif spotting, i.e., by a search of similar content. Such an approach is useful for contents with a certain redundancy or if a large database is be available. Fortunately, the current context often puts us in one of these two situations and finding elsewhere similar motifs is possible. The primary objective of this study is to provide a broad theoretical framework that once established will facilitate the efficient development of processing tools for various audio content. The second objective is the specific use of this approach to the processing of movie soundtracks with application in 5.1 upmixing for instance
Querol, del Amo Marc. "Open Source Software: critical review of scientific literature and other sources". Thesis, Norwegian University of Science and Technology, Department of Computer and Information Science, 2007. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9548.
Testo completoThis thesis presents the results of a survey of Open Source Licensing literature. It aims to assist the reader in choosing the best license for his/her business. For this reason, the content of this thesis can be divided into: (i) an open source licensing overview, (ii) the explication of the main features of the most popular open source licenses, (iii) the consequences of using one or another and (iv) the critical or controversial issues related to Open Source Licensing. Furthermore, at the end of the thesis, the reader can ¯nd the method we followed to collect, classify and analyze the relevant information for the purpose of the survey.
Erupe, Mark E. "Sources and Source Processes of Organic Nitrogen Aerosols in the Atmosphere". DigitalCommons@USU, 2008. https://digitalcommons.usu.edu/etd/196.
Testo completoLee, Hanlim. "Identifying sources and source contributions of PM [subscript 2.5] in Atlanta Georgia". Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/20716.
Testo completoSpalding, Duncan Robert. "Characterisation of treated timber sources of pesticide contaminants using source modelling techniques". Thesis, De Montfort University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391694.
Testo completoSama, Sanjana. "An Empirical Study Investigating Source Code Summarization Using Multiple Sources of Information". Youngstown State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1527673352984124.
Testo completoIvwurie, Wisdom. "Source appointment and use of hydropyroysis to elucidate sources of heavily biodegraded hydrocarbons". Thesis, University of Nottingham, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.422740.
Testo completoSubbalakshmi, K. P. "Joint source-channel decoding of variable-length encoded sources with applications to image transmission". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0013/NQ61684.pdf.
Testo completoPatzer, Cedric [Verfasser]. "Time-lapse inversion of Controlled Source Electromagnetics using vertical sources and receivers / Cedric Patzer". Berlin : Freie Universität Berlin, 2019. http://d-nb.info/1192755650/34.
Testo completoJacques-Boussard, Elodie. "Aux sources du malentendu entre interlocuteurs sourds et entendants : L'histoire, la langue, la culture". Thesis, Sorbonne Paris Cité, 2016. http://www.theses.fr/2016USPCD001.
Testo completoDeafness is a disability which concerns not only the hearing perception, butlanguage as well as relationships. Numerous misconceptions have been createdover time, and even today they plague the relations between individuals withimpaired hearing and the rest of the world. These misconceptions stem from aphilosophical basis which considers language to be the only vector for thought.These misunderstandings were further aggravated by the traumatic history, namelythe ban on sign language, as well as the particular language known as LSF. All ofthese elements combined create the culture and identity of a deaf person today andplay a role in his interaction with society. The resulting conflicts have led us to thestudy of a different misconception, one which is mainly based on the sensoryrelationship with the world. This thesis tries to consider the different sources of thesemisconceptions and their impact on the development of the expression of a deafindividual. Then we'll discuss a new form of misconception, concerning theperception of vibrations
ZEITUNI, CARLOS A. "Dosimetria de fontes de iodo-125 aplicadas em braquiterapia". reponame:Repositório Institucional do IPEN, 2008. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11759.
Testo completoMade available in DSpace on 2014-10-09T14:04:57Z (GMT). No. of bitstreams: 0
Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
RODRIGUES, BRUNA T. "Estudo e desenvolvimento de metodologia para fixação de iodo radioativo em substrato polimérico para confecção de fontes utilizadas em braquiterapia". reponame:Repositório Institucional do IPEN, 2015. http://repositorio.ipen.br:8080/xmlui/handle/123456789/23913.
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Dissertação (Mestrado em Tecnologia Nuclear)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
Traore, Sidi Yaya. "Le renouvellement des sources du droit des affaires". Thesis, Pau, 2019. http://www.theses.fr/2019PAUU2052/document.
Testo completoTo what extent does the renewal of business law sources influence its development? This is the question this study seeks to answer. The need to address such an issue arises today as a necessity for two main reasons. The first is that this area of law is marked by an unprecedented proliferation of standards. Indeed, in addition to the emergence of new sources in this branch of law, we are witnessing a parallel shift in its traditional sources: law, jurisprudence and practices. Many of the new sources are soft law. This thesis demonstrates how they can be admitted to the pantheon of the sources of the business world. The second is globalization, which exacerbates competition between legal systems "within and outside the European Union". In this context, it is important to verify whether the renewal of the sources of French business law favours or hinders its competitiveness. Consequently, the codification of business law, its attractiveness and its epistemological basis are examined from the perspective of the renewal of the sources of this field of law. Research shows that business law is renewed by its sources, because they make it more flexible, unify it and strengthen its epistemological basis. This renewal must however be put into perspective as it generates legal uncertainty in business world as a consequence of the aforementioned developments.The study proposes a renewed approach to the sources of business law, and suggests a new definition of the concept of formal source. In this way, it aims to contribute to the evolution of the general theory of the sources of law
MATTOS, FABIO R. de. "Estudo e desenvolvimento de uma semente de irídio-192 para aplicação em câncer oftálmico". reponame:Repositório Institucional do IPEN, 2013. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10518.
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Dissertação (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
Perotin, Lauréline. "Localisation et rehaussement de sources de parole au format Ambisonique : analyse de scènes sonores pour faciliter la commande vocale". Thesis, Université de Lorraine, 2019. http://www.theses.fr/2019LORR0124/document.
Testo completoThis work was conducted in the fast-growing context of hands-free voice command. In domestic environments, smart devices are usually laid in a fixed position, while the human speaker gives orders from anywhere, not necessarily next to the device, or nor even facing it. This adds difficulties compared to the problem of near-field voice command (typically for mobile phones) : strong reverberation, early reflections on furniture around the device, and surrounding noises can degrade the signal. Moreover, other speakers may interfere, which make the understanding of the target speaker quite difficult. In order to facilitate speech recognition in such adverse conditions, several preprocessing methods are introduced here. We use a spatialized audio format suitable for audio scene analysis : the Ambisonic format. We first propose a sound source localization method that relies on a convolutional and recurrent neural network. We define an input feature vector inspired by the acoustic intensity vector which improves the localization performance, in particular in real conditions involving several speakers and a microphone array laid on a table. We exploit the visualization technique called layerwise relevance propagation (LRP) to highlight the time-frequency zones that are correlate positively with the network output. This analysis is of paramount importance to establish the validity of a neural network. In addition, it shows that the neural network essentially relies on time-frequency zones where direct sound dominates reverberation and background noise. We then present a method to enhance the voice of the main speaker and ease its recognition. We adopt a mask-based beamforming framework based on a time-frequency mask estimated by a neural network. To deal with the situation of multiple speakers with similar loudness, we first use a wideband beamformer to enhance the target speaker thanks to the associated localization information. We show that this additional information is not enough for the network when two speakers are close to each other. However, if we also give an enhanced version of the interfering speaker as input to the network, it returns much better masks. The filters generated from those masks greatly improve speech recognition performance. We evaluate this algorithm in various environments, including real ones, with a black-box automatic speech recognition system. Finally, we combine the proposed localization and enhancement systems and evaluate the robustness of the latter to localization errors in real environments
Wetzel, William C. "Overcoming interferences in plasma source mass spectrometry alternative ionization sources, novel correction methods, and new instrumentation /". [Bloomington, Ind.] : Indiana University, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3223057.
Testo completo"Title from dissertation home page (viewed June 28, 2007)." Source: Dissertation Abstracts International, Volume: 67-06, Section: B, page: 3109. Adviser: Gary M. Hieftje.
Drouet, Julie. "Séparation des sources de bruit des moteurs Diesel : Application en hi'erarchisation de source et qualit'e sonore". Phd thesis, INSA de Lyon, 2013. http://tel.archives-ouvertes.fr/tel-01006187.
Testo completoDrouet, Julie. "Séparation des sources de bruit des moteurs Diesel : Application en hiérarchisation de source et qualité sonore". Thesis, Lyon, INSA, 2013. http://www.theses.fr/2013ISAL0053/document.
Testo completoThe spectrofilter is a Wiener filter used to extract combustion noise. This filter requires an important data processing and is determined in all operating conditions. Thus it is difficult to carry out perceptual studies on combustion noise from various motor adjustments. To overcome this drawback, this PhD dissertation aims to define a common filter which can synthesize a combustion noise in all operating conditions. For this, a perceptual study showed that the substitution of the conventional spectrofilter by another Wiener filter allows the synthesis of a combustion noise. The use of a common spectrofilter is thus possible. The experimental modal analysis allows to estimate the Wiener filter from characteristic data of the engine structure. After studying on a synthetic signal, the ESPRIT method seems to be the most appropriate, but requires some optimizations to be adapted to spectrofilter peculiarities. The Wiener filters of several running speeds are estimated in different estimating conditions, defined by the ESTER criterion. A fictitious damping evolution with the running speed is observed and linked to the temporal windowing applied on the spectrofilter computation. A perceptual experience is then carried out to identify if the ESTER criterion allows to estimate accurately filters to synthesize combustion noises similar to conventional combustion noises. The results lead to conceive the spectrofilter obtained in idling condition as a good common filter, as in a physical point of view that perception
Camacho, José Carlos. "Musique, drame et thérapie : un processus d'intégration pour les personnes sourdes". Thesis, Toulouse 2, 2014. http://www.theses.fr/2014TOU20067/document.
Testo completoThe object of this study is to present the use of the game as therapy musical and theatrical (dramatherapy) for Deaf people to find the playful and funny character of the therapy and also to facilitate their integration to the University. This is fundamental in the therapy and the exploration of the pleasure shared through the game, the meaning and creative progress of every Deaf person and his physical and emotional and playful participation within the group
Cook, Shaun P. "Are All Sources Equal? Examining the Roles of Aging and the Frontal Lobes on Multiple Types of Source Memory Using a Repeated-Measures Design". Diss., The University of Arizona, 2006. http://hdl.handle.net/10150/195539.
Testo completoLi, Kwan-lok, e 李君樂. "Study of x-ray supernovae and supersoft/quasisoft x-ray sources with an automated source search program". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B46084125.
Testo completoMatthews, James. "News sources and perceptual effects : an analysis of source attribution within news coverage of alleged terrorist plots". Thesis, Bournemouth University, 2010. http://eprints.bournemouth.ac.uk/16207/.
Testo completoMeyer-Waarden, Lars. "Les sources d'efficacité des programmes de fidélisation : une étude empirique sur la base d'un panel single source". Pau, 2002. http://www.theses.fr/2002PAUU2010.
Testo completoThe purpose of this research is to contribute to a better theoretical knowledge about the sources of efficiency in loyalty programs, in the retail sector. We develop two ideas: the selective impact of the loyalty program, and its effect on the modification of purchase behaviour. Our investigation has been carried out for a 36 months period, based on the BehaviorScan single-source panel, covering 300. 000 purchase transactions from 7 hyper-and supermarkets, which has been crossed with the store database of a French retailer. We conclude with the multinomial Dirichlet model that the double jeopardy phenomenon is present and loyalty programs do not substantially change market structures. At an individual level, variance analyses with repeated measures and survival analyses show that the impact of loyalty cards on purchase behaviour is relatively weak, short-term and selective as they primarily attract heavy customers of the store but not of the category. The principal role of loyalty cards is thus to select and identify the best customers, leading therefore to an improved focus of resources
Picquenot, Adrien. "Introduction and application of a new blind source separation method for extended sources in X-ray astronomy". Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASP028.
Testo completoSome extended sources, among which we find the supernovae remnants, present an outstanding diversity of morphologies that the current generation of spectro-imaging telescopes can detect with an unprecedented level of details. However, the data analysis tools currently in use in the high energy astrophysics community fail to take full advantage of these data : most of them only focus on the spectral information without using the many spatial specificities or the correlation between the spectral and spatial dimensions. For that reason, the physical parameters that are retrieved are often widely contaminated by other components. In this thesis, we will explore a new blind source separation method exploiting fully both spatial and spectral information with X-ray data, and their correlations. We will begin with an exposition of the mathematical concepts on which the algorithm rely, and particularly on the wavelet transforms. Then, we will benchmark its performances on supernovae remnants models, and we will investigate the vast question of the error bars on non-linear estimators, still largely unanswered yet essential for data analysis and machine learning methods. Finally, we will apply our method to the study of three physical problems : the asymmetries in the heavy elements distribution in the supernova remnant Cassiopeia A, the filamentary structures in the synchrotron of the same remnant and the X-ray counterpart to optical filamentary structures in the Perseus galaxy cluster
Fritzler, Sven. "Particle sources with high-intensity lasers : a tool for plasma diagnostics and an innovative source for applications". Palaiseau, Ecole polytechnique, 2003. http://www.theses.fr/2003EPXX0056.
Testo completoD'Silva, Faye I. "Writing from sources: How three undergraduate multilingual writers negotiated elements of source-based writing in an EAP course that used literary and nonliterary source texts". The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1386765963.
Testo completoLarouer, Marion. "Les codes de conduite, sources du droit". Thesis, Lyon, 2016. http://www.theses.fr/2016LYSES071.
Testo completoCorporate-initiated codes of conduct appeared at the end of the 1980s. They are part of corporate social responsibility (CSR), an effort on the part of corporations to protect their right to operate in a business environment increasingly subject to new norms, especially when it comes to labour conditions in developing countries.Codes of conduct raise several legal questions, most notably with respect to their form, the behaviors they regulate and their ethical nature, generating strong, diverse doctrinal positions. Many call into question the legal nature of such codes and their connection with the sources of law. Therefore, the objective of this research is to explore the complex relationship between codes of conduct and the sources of law. In this light, the traditional conception of the sources of law reveals some shortcomings, whereas the more contemporary soft law approach seems more inclusive. The nexus between soft law and the codes of conduct revolves around the legal effects that each can produce. To that end, the study of how these codes work in practice is essential not only to address their legal effect, but also to see codes of conduct as true sources of law
Pinson, Samuel. "Caractérisation des fonds marins par la méthode des sources images". Phd thesis, Université de Bretagne occidentale - Brest, 2011. http://tel.archives-ouvertes.fr/tel-00665037.
Testo completoAbdulghani, Mohamad. "Les sources infra-législatives en droit fiscal : analyse d'un désordre normatif". Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM1078.
Testo completoMondor, Luke. "Does source matter? Using ProMED-mail to compare the timeliness of outbreak communications from governmental and nongovernmental sources". Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=106558.
Testo completoHistorique : Comparé aux systèmes de déclaration gouvernementaux traditionnels, les sources d'information non gouvernementales (ou informelles) sont réputées produire des avertissements plus précoces en terme d'éclosion de maladies, facilitant ce faisant la reconnaissance rapide et une réponse prompte aux flambées épidémiques naissantes et aux potentielles pandémies. Malgré un recours accru aux systèmes de déclaration informels, il existe peu de preuves empiriques pour supporter cette affirmation. Dans ce projet, nous avons examiné (1) si la source originale de l'information sur une flambée épidémique (gouvernemental ou non gouvernementale) était un facteur explicatif dans la déclaration précoce de flambées épidémiques et (2) l'évolution des communications sur les flambées épidémiques par les sources gouvernementales et non gouvernementales.Méthodes : En utilisant une base de données comptant 398 flambées épidémiques infectieuses distinctes sélectionnées à partir du « Disease Outbreak News » de l'Organisation Mondiale de la Santé de 1996 à 2009, nous avons identifié la ou les sources et la date de la première communication au sujet de cette flambée épidémique, au moyen des archives de ProMED-mail. Des modèles de régression négative binomiale ont été utilisés pour évaluer les différences et améliorations en terme de déclaration rapide de flambées épidémiques (comparé à la date présumée de leur début), par type de sources.Résultats : Nous n'avons trouvé aucune différence statistiquement significative dans la rapidité des communications au sujet des flambées épidémiques entre celles rapportées en premier par des sources non gouvernementales comparées à celle déclarées en premier par des sources gouvernementales pour la période 1996-2009 (IRR=0.95, 95% CI [0.77, 1.18]). De plus, bien que les deux types de sources rapportent les flambées épidémiques plus rapidement, une amélioration statistiquement significative n'a été notée que pour les sources gouvernementales (IRR=0.94, 95% CI [0.91, 0.97]). Conclusion : À notre connaissance, il s'agit de la première étude à quantifier la rapidité des communications au sujet de flambées épidémiques provenant des sources gouvernementales et non gouvernementales, touchant une période étendue et une variété de maladies. Bien qu'aucune différence statistiquement significative n'a été démontrée entre ces deux types de sources, nos résultats sont limités à un petit échantillon de flambées épidémiques confirmées par l'OMS. D'autres études sont nécessaires pour confirmer ces résultats.
Placko, Dominique, Thierry Bore e Tribikram Kundu. "Family of Quantum Sources for Improving Near Field Accuracy in Transducer Modeling by the Distributed Point Source Method". MDPI AG, 2016. http://hdl.handle.net/10150/621954.
Testo completoGalluzzi, Vincenzo <1987>. "Multi-frequency polarimetric study of a complete sample of extragalactic radio sources: radio source populations and cosmological perspectives". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amsdottorato.unibo.it/8650/1/Tesi_PhD_Galluzzi_Vincenzo.pdf.
Testo completoLiu, Miaomiao. "Actinomycetes Sourced From Unique Environments as a Promising Source of New TB-Active Natural Products". Thesis, Griffith University, 2017. http://hdl.handle.net/10072/366523.
Testo completoThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Natural Sciences
Science, Environment, Engineering and Technology
Full Text
Lopez, Colin. "Développement de sources haute-résolution de particules chargées grâce au contrôle de leur trajectoire par corrélation temps-position". Thesis, université Paris-Saclay, 2021. http://www.theses.fr/2021UPASP013.
Testo completoThe topic of this thesis is the development of charged particle sources (ions or electrons) whose energy resolution, position and time approach the limits permitted by physic laws. The idea is to use the sensitive detection in time and position for one of the two correlated charged particles produced by the photoionization of an cold atoms cloud, to correct in real time the 3D trajectory of the particle partner to know as thinly as possible its spatiotemporal characteristics. The project aims to create, from the ionization of cesium atoms cooled by laser, a new type of ion or electron source allowing a better beam. We can now consider new experiences based on the unique control of charged particles and thus overpass the Coulomb repulsion effects that degrades the common sources.The ultimate goal is to be able to depose an ion or an electron on a surface with the speed, position and time characteristics never reached. Some applications in ions implantation are expected (lithography). In terms of trajectory correction it could allow a full control of time, position and velocity of ions reaching the target. A further increase of the flow is already considered for purposes of imaging (real-time processing of time-position data). The project presented here is now part of a larger project: an ion source based on this concept is under study with the Orsay Physics Company specialized in the design and manufacture of columns Focused ion beam (FIB)
Hursky, Paul. "Using ambient noise and sources of opportunity to estimate environment parameters and improve matched field source detection and localization /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2001. http://wwwlib.umi.com/cr/ucsd/fullcit?p3000404.
Testo completoLundberg, Emelie, e Adrian Sadikovic. "Vem skyddar vi källan från? : En kvalitativ studie om digital säkerhet och källskydd bland svenska journalister". Thesis, Mittuniversitetet, Avdelningen för medie- och kommunikationsvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-32885.
Testo completoPerotin, Lauréline. "Localisation et rehaussement de sources de parole au format Ambisonique : analyse de scènes sonores pour faciliter la commande vocale". Electronic Thesis or Diss., Université de Lorraine, 2019. http://www.theses.fr/2019LORR0124.
Testo completoThis work was conducted in the fast-growing context of hands-free voice command. In domestic environments, smart devices are usually laid in a fixed position, while the human speaker gives orders from anywhere, not necessarily next to the device, or nor even facing it. This adds difficulties compared to the problem of near-field voice command (typically for mobile phones) : strong reverberation, early reflections on furniture around the device, and surrounding noises can degrade the signal. Moreover, other speakers may interfere, which make the understanding of the target speaker quite difficult. In order to facilitate speech recognition in such adverse conditions, several preprocessing methods are introduced here. We use a spatialized audio format suitable for audio scene analysis : the Ambisonic format. We first propose a sound source localization method that relies on a convolutional and recurrent neural network. We define an input feature vector inspired by the acoustic intensity vector which improves the localization performance, in particular in real conditions involving several speakers and a microphone array laid on a table. We exploit the visualization technique called layerwise relevance propagation (LRP) to highlight the time-frequency zones that are correlate positively with the network output. This analysis is of paramount importance to establish the validity of a neural network. In addition, it shows that the neural network essentially relies on time-frequency zones where direct sound dominates reverberation and background noise. We then present a method to enhance the voice of the main speaker and ease its recognition. We adopt a mask-based beamforming framework based on a time-frequency mask estimated by a neural network. To deal with the situation of multiple speakers with similar loudness, we first use a wideband beamformer to enhance the target speaker thanks to the associated localization information. We show that this additional information is not enough for the network when two speakers are close to each other. However, if we also give an enhanced version of the interfering speaker as input to the network, it returns much better masks. The filters generated from those masks greatly improve speech recognition performance. We evaluate this algorithm in various environments, including real ones, with a black-box automatic speech recognition system. Finally, we combine the proposed localization and enhancement systems and evaluate the robustness of the latter to localization errors in real environments
Costa, Facundo hernan. "Bayesian M/EEG source localization with possible joint skull conductivity estimation". Thesis, Toulouse, INPT, 2017. http://www.theses.fr/2017INPT0016/document.
Testo completoM/EEG mechanisms allow determining changes in the brain activity, which is useful in diagnosing brain disorders such as epilepsy. They consist of measuring the electric potential at the scalp and the magnetic field around the head. The measurements are related to the underlying brain activity by a linear model that depends on the lead-field matrix. Localizing the sources, or dipoles, of M/EEG measurements consists of inverting this linear model. However, the non-uniqueness of the solution (due to the fundamental law of physics) and the low number of dipoles make the inverse problem ill-posed. Solving such problem requires some sort of regularization to reduce the search space. The literature abounds of methods and techniques to solve this problem, especially with variational approaches. This thesis develops Bayesian methods to solve ill-posed inverse problems, with application to M/EEG. The main idea underlying this work is to constrain sources to be sparse. This hypothesis is valid in many applications such as certain types of epilepsy. We develop different hierarchical models to account for the sparsity of the sources. Theoretically, enforcing sparsity is equivalent to minimizing a cost function penalized by an l0 pseudo norm of the solution. However, since the l0 regularization leads to NP-hard problems, the l1 approximation is usually preferred. Our first contribution consists of combining the two norms in a Bayesian framework, using a Bernoulli-Laplace prior. A Markov chain Monte Carlo (MCMC) algorithm is used to estimate the parameters of the model jointly with the source location and intensity. Comparing the results, in several scenarios, with those obtained with sLoreta and the weighted l1 norm regularization shows interesting performance, at the price of a higher computational complexity. Our Bernoulli-Laplace model solves the source localization problem at one instant of time. However, it is biophysically well-known that the brain activity follows spatiotemporal patterns. Exploiting the temporal dimension is therefore interesting to further constrain the problem. Our second contribution consists of formulating a structured sparsity model to exploit this biophysical phenomenon. Precisely, a multivariate Bernoulli-Laplacian distribution is proposed as an a priori distribution for the dipole locations. A latent variable is introduced to handle the resulting complex posterior and an original Metropolis-Hastings sampling algorithm is developed. The results show that the proposed sampling technique improves significantly the convergence. A comparative analysis of the results is performed between the proposed model, an l21 mixed norm regularization and the Multiple Sparse Priors (MSP) algorithm. Various experiments are conducted with synthetic and real data. Results show that our model has several advantages including a better recovery of the dipole locations. The previous two algorithms consider a fully known leadfield matrix. However, this is seldom the case in practical applications. Instead, this matrix is the result of approximation methods that lead to significant uncertainties. Our third contribution consists of handling the uncertainty of the lead-field matrix. The proposed method consists in expressing this matrix as a function of the skull conductivity using a polynomial matrix interpolation technique. The conductivity is considered as the main source of uncertainty of the lead-field matrix. Our multivariate Bernoulli-Laplacian model is then extended to estimate the skull conductivity jointly with the brain activity. The resulting model is compared to other methods including the techniques of Vallaghé et al and Guttierez et al. Our method provides results of better quality without requiring knowledge of the active dipole positions and is not limited to a single dipole activation
Qi, Liqiang. "Measurements of Prompt Gamma Rays Emitted in Fission of ²³⁸U and ²³⁹ Pu Induced by Fast Neutrons from the LICORNE Neutron Source". Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS320/document.
Testo completoPrompt fission γ-ray spectra are important nuclear data for reactor physics, as an input for gamma heating calculations, since the gamma heating effect can be under-estimated by up to ~28% with present nuclear data. Furthermore the new prompt fission γ-ray information will be useful from a fundamental physics point of view, where results can be compared with many competing theoretical predictions to refine models of fission process. Prompt fission γ-ray spectra have been measured for the fast-neutron-induced fission of ²³⁸U and ²³⁹PuPu, using fast neutrons generated from the LICORNE source. The experimental setup consisted of an ionization chamber and different types of scintillation detectors, including LaBr₃ and PARIS phoswich detectors. An analysis procedure, including unfolding and recovering the γ-ray response in the scintillation detectors, is developed to extract the prompt fission γ-ray spectrum and corresponding spectral characteristics. The experimental results are compared to the fission modeling codes GEF and FREYA. This comparison reveals that the spectral characteristics are related to the energetic conditions, isotopic yields and angular momentum of the fission fragments. The energy dependence of the spectral characteristics shows that the prompt γ-rays emission is quite insensitive to the incident neutron energy. However, a strong dependence on the particular fissioning system is observed
Yaacoub, Charles. "Codage conjoint source-canal pour l'optimisation d'un système de codage distribué de sources vidéo transmises sur un lien sans fil". Phd thesis, Paris, ENST, 2009. https://pastel.hal.science/pastel-00005457.
Testo completoIn this thesis, we first develop a comparative study between binary and non binary turbo-codes used for channel coding as well as for the compression of distributed sources, and we implement a distributed video coding system based on quadri-binary turbo-codes. We then derive the theoretical compression bounds for the case of source coding as well as for joint source-channel coding. These calculations are then used in a cross-layer approach that aims at reducing the excessive use of the feedback channel. Therefore, our system determines the transmission rate for each user taking into account the amount of motion in the captured video scene as well as the state of the transmission channel. We propose afterwards a coding technique that estimates the transmission rate for each user while optimizing the value of the quantization parameter. As a result, we obtain a distributed video coding system with adaptive quantization and dynamic rate allocation. The influence of H. 264 Intra-coding of key frames on the system's performance is also considered. Based on our theoretical study, we then develop novel algorithms that dynamically adapt the GOP size and determine the coding mode for each frame, without the need for a feedback channel. Finally, a frame fusion approach that aims at improving the side information is proposed, based on genetic algorithms
Yaacoub, Charles. "Codage conjoint source-canal pour l'optimisation d'un système de codage distribué de sources vidéo transmises sur un lien sans fil". Phd thesis, Télécom ParisTech, 2009. http://pastel.archives-ouvertes.fr/pastel-00005457.
Testo completoVardomskaya, Tamara Nikolaevna. "Sources of Subjectivity". Thesis, The University of Chicago, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10812973.
Testo completoSubjectivity is the phenomenon of the apparent truth of a predicate depending on a perspective of evaluation, such that one person may sincerely assert a proposition p while another may sincerely assert not-p. Among the numerous analyses of the semantics of subjective predicates (Lasersohn 2005, Stojanovic 2007, Stephenson 2007, MacFarlane 2014, Barker 2002, a.o.), few consider what makes them differ from objective ones: what makes delicious allow faultless disagreement while wooden or red do not? Assumptions that subjective and objective predicates differ In their semantics (do not have truth conditions as per expressivism, have another index or argument as per relativism or contextualism) ignore the fact that the same predicate may be subjective in a context where it is loosely defined and objective in a context where it is stringently defined. E.g. the truth of good figure skater is objective to trained figure skating judges but subjective to casual TV watchers.
I provide a relatively theory-neutral analysis of what makes subjective predicates what they are. I argue that objective predicates are precisely those for which there is a reliable consensus of what evidence matters (to distinguish from a reliable consensus as to whether propositions containing them are true: we do not know whether there is life on other planets, but we know what it would take to prove it). For subjective predicates, and propositions containing them, there is no reliable and socially enforced consensus as to what evidence matters, and how much, and what does not, and for some predicates, there cannot be. Thus, speakers are allowed, in a pragmatic context, to perceive the evidence differently (to have different taste perceptions due to genetic differences in smell receptors) or to classify it differently (looking at a painting, to judge whether it is excellent or poor based on differing prior expertise in painting). If we allow differing perceptions or different categorizations to be valid, we have a subjective predicate.
As a follow-up, I explain the selection criteria of find (NP ) (Predicate) - `I find the soup disgusting/wonderful’ - which is known (Saebo2009 a.o.) to select for subjective constructions. I argue that find actually selects for direct experience of its object, as was proposed by Stephenson (2007), and I address subsequent criticisms of that analysis and extend it to modal expressions such as `I find the Cubs winning unlikely,’ which had not been previously considered in the literature. I conclude by showing how my analysis fits into different theories (expressivism, relativism, contextualism, metalinguistic negotiation) by providing them with clearer selection criteria for not only what a subjective predicate is, but why it is so.