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1
Henson, Richard Nevill Astley. "Short-term memory for serial order". Thesis, University of Cambridge, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396139.
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Preece, Timothy Edward. "Modelling human short-term memory for serial order". Thesis, Bangor University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320400.
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Glasspool, David William. "Modelling serial order in behaviour : studies of spelling". Thesis, University College London (University of London), 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391254.
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4
Raymond, Donald Michael. "On the efficient serial realization of multidimensional order statistics filters". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/nq22492.pdf.
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Pfordresher, Peter Q. "Auditory feedback in music performance : serial order and relative timing /". The Ohio State University, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486572165278604.
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6
Hurlstone, Mark John. "The problem of serial order in visuospatial short-term memory". Thesis, University of York, 2010. http://etheses.whiterose.ac.uk/14214/.
Testo completoAbstract (sommario):
How do we remember the order of a novel sequence of items? Much research has examined how people remember sequences of verbal stimuli (e.g., digits in a phone number), and several mechanisms of serial order have been proposed to underlie memory for such sequences. Less research has examined how people remember the order of sequences of visuospatial stimuli (e.g., a series of spatial locations), and the mechanisms of serial order underlying such sequences remain unspecified. This thesis explores the extent to which memory for sequences of visuospatial stimuli is explicable in term of mechanisms proposed to underlie memory for verbal sequences. Contemporary models of verbal short-term memory represent serial order either by: (I) using a competitive queuing sequence planning and control mechanism, by (2) position marking, by (3) a primacy gradient of activation, by (4) incorporating response suppression, and by (5) implementing output interference, or through some combination of these mechanisms. Empirical evidence suggests that all five mechanisms must coexist in any adequate model of serial order memory for verbal sequences. In this thesis, I argue that extant data indicating functional similarities between verbal and visuospatial serial order memory support the idea that visuospatial sequences are planned and controlled using a competitive queuing mechanism. However, direct evidence for the role of the four remaining mechanisms of serial order in visuospatial short-term memory is currently lacking. I present a series of twelve experiments examining memory for visuospatial sequences, combined with computational modelling work, which sought direct evidence for the role (or lack thereof) of the different mechanisms of serial order. The outcomes of the experiments and computational modelling work suggest that the serial order of a visuospatial sequence is represented by a competitive queuing system, equipped with a primacy gradient, positional markers, and response suppression. The results therefore buttress the notion that verbal and visuospatial short-term memory rely on some common mechanisms for the representation and generation of serial order.
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Horton, Neil James. "Memory for Serial Order Across Domains : Order Reconstrucion and Hebb Repetition Learning in Adults and Children". Thesis, Lancaster University, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.531697.
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8
Pennington, Elisabeth Anne. "Temporal memory in ageing". Thesis, University of Warwick, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247969.
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9
Butler, Jennifer. "The Relationship between Birth Order and Victim Selection in Serial Killers". Thesis, The Chicago School of Professional Psychology, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3729095.
Testo completoAbstract (sommario):
Homicides linked to serial killers comprise a small percentage of the total number of murders committed in the United States, as well as overseas; however, there has always been an immense interest in these type of killings due to the mysterious nature of their perpetrators and their motives for killing. This small percentage could be due to the decreased incidence of the mental illnesses usually associated with serial killers (i.e., Antisocial Personality Disorder and Psychopathy), and advances in police investigative methods such as DNA matching that have resulted in a higher rate of solved murders, and consequently fewer serial killers still at large. Many theories have been proposed to try to explain why serial killers murder their victims. The most popular of these theories is the organized and disorganized dichotomy of serial killers’ methods. By using this theory and linking it with both Alfred Adler’s (1928) theory of birth order and Michael Kirton’s (1976) adaptor and innovator theory the relationship between a serial killer’s birth order and the types of victims he chooses can be explored.
10
Tullberg, Hugo Mattias. "Bit-interleaving and serial-concatenation techniques for higher-order coded modulation /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2002. http://wwwlib.umi.com/cr/ucsd/fullcit?p3070989.
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Nakayama, Masataka. "The problems of serial order in language:Clustering, context discrimination, temporal distance, and edges". Kyoto University, 2015. http://hdl.handle.net/2433/200480.
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Baskan, Fevzi. "Analysis Of Serial Inventory Systems Under Nonstationary Demand". Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605584/index.pdf.
Testo completoAbstract (sommario):
In this study we consider a two-echelon supply chain with a nonstationary demand process. The retailer batches the customer demand for a predetermined number of periods before placing an order to the supplier. We show that the demand process for the supplier is more variable than that for the retailer. It is observed that the supplier can reduce the variability of orders by tracking the exogenous demand occurring at the retailer's side.
13
Xie, Danke. "A computational biologically-plausible model of working memory for serial order, repetition and binding". Diss., [La Jolla, Calif.] : University of California, San Diego, 2009. http://wwwlib.umi.com/cr/ucsd/fullcit?p3344748.
Testo completoAbstract (sommario):
Thesis (Ph. D.)--University of California, San Diego, 2009.Title from first page of PDF file (viewed April 1, 2009). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 150-163).
14
Foster, Christa Lorraine. "Observational sequence learning". Thesis, University College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322504.
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Santana, Jeanny Joana Rodrigues Alves de. "Codificação incidental da ordem serial na memória de trabalho visuoespacial: evidências baseadas em uma tarefa de detecção da mudança". Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/59/59134/tde-08092010-091347/.
Testo completoAbstract (sommario):
A memória para a ordem dos eventos em uma sequência está relacionada com muitos domínios cognitivos, como direcionar o comportamento a um objetivo, reconhecer uma ação e prever eventos do ambiente. A codificação da ordem serial tem sido, portanto, um tema polêmico a ser explicado pelos modelos de memória de trabalho visuoespacial. Neste estudo investigamos a codificação incidental da ordem serial de eventos em tarefas de reconhecimento de sequências, nas quais a dimensão relevante para a resposta poderia ser a aparência visual, a localização espacial ou a conjunção visuoespacial dos eventos. A tarefa exigia que os participantes (n=60) detectassem uma mudança em um dos estímulos da sequência e ignorassem mudanças na dimensão irrelevante: a ordem na qual os eventos eram apresentados. De maneira geral, o desempenho foi mais prejudicado nas sequências em que a ordem dos itens mudava. A comparação das três condições de memória (aparência visual, localização espacial e conjunção visuoespacial) revelou que houve melhor desempenho na tarefa espacial. Nesta condição, ocorreu uma interação entre os fatores mudança na dimensão relevante (localização espacial) e mudança na dimensão irrelevante (ordem serial). Estes resultados revelam que a ordem foi codificada de forma incidental com as informações relevantes para a tarefa. A diferença do efeito da mudança da dimensão irrelevante para os três tipos de sequências sugere que a ordem foi codificada em um estágio inicial do processamento de informações e, por isto, incluída na comparação de características, gerando diferentes padrões de respostas conforme a modalidade do estímulo. A interação entre localização e ordem serial indica que a informação espacial foi registrada de maneira integrada à ordem dos eventos na sequência, em uma representação espaço-temporal unitária. Supõe-se que um mecanismo de manutenção da informação espacial tenha operado recitando os eventos na ordem em que foram apresentados na sequência. Considera-se, também, a possibilidade de a apresentação sequencial dos estímulos ter gerado uma representação visuoespacial baseada em uma organização temporal das informações. Neste caso, é provável que um mecanismo de integração de informações tenha operado para realizar a interface entre uma estrutura temporal previamente armazenada na memória de longo prazo e o conteúdo da memória de trabalho. Estes achados sugerem a existência de um sistema responsável pela conjunção de informações de diferentes dimensões e integração de conteúdos da memória de trabalho e memória de longo prazo. As evidências obtidas neste estudo têm implicações em diferentes áreas do conhecimento. Na perspectiva da psicologia cognitiva experimental são discutidos os modelos atuais de memória de trabalho. No âmbito da psicologia cognitiva aplicada são fornecidos subsídios teóricos para o desenvolvimento de ferramentas diagnósticas para caracterização de déficits de aprendizagem e lesões neurológicas relacionados com o processamento de sequências de informações visuoespaciais. Além disso, é possível estabelecer uma relação entre os processos de memória e os mecanismos de organização do comportamento em contextos clínicos.The memory for the events order in a sequence is related to many cognitive domains, such as managing behavior to a goal, to recognize an action and anticipate events in the real world. The encoding of serial order has been a controversial topic to be explained by the models of visuospatial working memory. We investigated the incidental encoding of events serial order in recognition tasks sequences, in which a relevant dimension to the response could be the visual appearance, the spatial location or visuospatial conjunction of events. The task required that participants (n = 60) to detect a change in a sequence of stimuli and ignore changes in irrelevant dimension: the order in which events were presented. In general, performance was more impaired in the sequences where the order of items changed. The comparison of the three memory conditions (visual appearance, spatial location and visuospatial conjunction) revealed that there was better performance in spatial task. In this condition, there was an interaction between change in the relevant dimension (spatial location) and change in the irrelevant dimension (serial order). These results show that the order was codified indirectly with relevant information to the task. The difference in the effect of changing the dimension irrelevant to the three types of sequences suggests that the order was codified in an early stage of information processing and, therefore, included in feature comparison, generating different patterns of responses depending on the modality of the stimulus. The interaction between location and serial order indicates that the spatial information was registered in an integrated manner to the order of events following in a unitary space-time representation. It is assumed that a mechanism for maintenance of spatial information has operated reciting the events in the order they were presented in sequence. It is considered also the possibility that the sequential presentation of stimuli have generated a visuospatial representation based on information temporal organization. In this case, it is likely that a mechanism of information integration has operated to achieve the interface between a temporal structure previously stored in long-term memory and the contents of working memory. These findings suggest the existence of a system responsible for the combination of information from different dimensions and integration of working memory contents and long-term memory. Data obtained in this study have implications in different areas of knowledge. In view of experimental cognitive psychology current models of working memory are discussed. Within the cognitive psychology applied theoretical support are provided for the development of diagnostic tools for characterizing learning deficits and neurological injuries related to the processing of visuospatial information sequences. Furthermore, it is possible to establish a relationship between memory processes and the mechanisms of organization of behavior in clinical settings.
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Grenfell-Essam, Rachel. "Examining the similarities between immediate serial recall and immediate free recall : the effects of list length and output order". Thesis, University of Essex, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.589444.
Testo completoAbstract (sommario):
This thesis examines the similarities and differences between two widely-used immediate memory tasks: immediate serial recall (ISR) and immediate free recall (IFR). Until recently these two tasks were explained by separate theories, but recent researchers have encouraged greater integration by showing considerable similarities under identical list lengths (LL) and methods. Eight experiments are presented in three chapters. Chapter 2 examines strategy use in the two tasks. Participants were shown not to use LL-specific strategies in IFR (Experiment 1) or ISR (Experiment 2). Indeed, encoding strategy use was similar in both tasks: participants showed no effect of test-expectancy (Experiment 3). These findings show that participants encode ISR and IFR in similar ways, irrespective of knowledge of the LL, and that differences between the tasks are due to retrieval. Chapter 3 examines why participants tend to initiate IFR of short lists with the first word in the list. I looked at three putative mechanisms for generating the primacy effect in IFR: covert rehearsal (Experiment 4), selective attention (Experiment 5), and temporal distinctiveness (Experiment 6). I found that no manipulation abolished primacy. Chapter 4 showed similar effects of modality (Experiment 7) and temporal isolation (Experiment 8) on ISR and IFR when examined under the same methodology. In summary, this thesis has shown that when LL is equated ISR and IFR are more similar than previously thought. Due to the growing evidence that both tasks are underpinned by common memory mechanisms I conclude that there is a need for greater theoretical integration between the two tasks. I relate my results to different theories of ISR and IFR, and provide a verbal description of a preferred explanation of the data.
17
Ng, Li Huang Honey. "Evaluating models of verbal serial short-term memory using temporal grouping phenomena". University of Western Australia. School of Psychology, 2007. http://theses.library.uwa.edu.au/adt-WU2008.0059.
Testo completoAbstract (sommario):
[Truncated abstract] Various capabilities such as the ability to read or conduct a conversation rely on our ability to maintain and recall information in the correct order. Research spanning more than a century has been devoted to understanding how units of information are retained in order in short-term memory. The nature of the mechanisms that code the positions of items in serial short-term verbal recall can be investigated by examining a set of phenomena that can be termed temporal grouping effects. Inserting extended pauses to break a list of verbal items into sub-lists (e.g. SHD-QNR-BJF, where the dashes represents the pauses) improves the accuracy of serial recall relative to performance observed without this temporal grouping. In addition, two other effects are linked to temporal grouping. One of these effects is a shift in the shape of the serial position function, which changes from a single bowed function to a multiple-bowed function. That is, the serial position curve for ungrouped sequences is typically characterized by better performance for the beginning and ending items compared to the mid-list items. For grouped lists, the multiple-bowed function comprises better recall for the beginning and ending items within each group. Another effect associated with temporal grouping is a change in the patterns of order errors. For ungrouped sequences (e.g. SHDQNRBJF), order errors often involve the swapping of items in neighbouring positions, such as exchanging D for Q or R for B. By contrast, grouped sequences (such as SHD-QNR-BJF) show a reduction in order errors that cross group boundaries such as exchanging items D and Q or R and B; instead, there tend to be an increased incidence of exchanging items that share similar within-group positions such as swapping H and N or Q and B. According to several current models of short-term memory, items are retained by associating them with extra-list information such as contextual information. ... This was done by unconfounding temporal position (time from group onset) and ordinal position (number of items from group onset) for certain key items in sequences comprising two groups of four consonants. The critical manipulation was to vary the SOAs within and across the two groups. Errors that involve items migrating across groups should preserve within-group temporal position according to oscillator models, but should preserve within-group ordinal position according to non-oscillator models. Results from the intergroup errors strongly favored preservation of ordinal rather than temporal position. Finally, the Appendix reports an unpublished experiment that examined patterns of errors in recalling sequences of nine visually presented letters, where the letters were grouped into threes using temporal gaps. A critical manipulation was the insertion of a tobe- ignored item (an asterisk) between the first and second letters of selected groups. Inclusion of this item failed to alter the patterns of errors observed, indicating that the coding of serial position is based on only those events represented for recall. The central conclusion based on all the studies is that serial order for verbal items is retained using contextual positional codes that change with each presentation of a tobe- remembered item, are influenced by large temporal gaps that lead to grouping, but otherwise are not dependent on the timing of events.
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Santana, Jeanny Joana Rodrigues Alves de. "A função executiva de atualização de informações na memória de trabalho para a ordem serial de eventos visuais e espaciais". Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/59/59134/tde-24102013-150940/.
Testo completoAbstract (sommario):
No modelo dos multicomponentes da memória de trabalho o problema do armazenamento da ordem serial de eventos visuais e espaciais ainda é muito discutido. A literatura sugere que recursos do executivo central (o sistema de controle atencional da memória de trabalho) são utilizados para manter a representação da posição serial dos estímulos visuais e espaciais na memória. Mais precisamente, é proposto que a função executiva de atualização de informações esteja envolvida com este processo. Esta função promoveria a modificação contínua da representação mental conforme a entrada de novas informações no sistema cognitivo. Entretanto, não está esclarecido se ocorre uma dissociação visual e espacial no uso de recursos da função executiva de atualização de informações para o registro da ordem serial. O objetivo do presente estudo foi verificar o envolvimento da função executiva de atualização da informação na memória para a ordem de eventos visuais e espaciais. Os participantes foram estudantes universitários (n = 71) que realizaram as tarefas de memória delineadas segundo o paradigma de tarefas duplas. Neste procedimento as tarefas primárias de memória visual e espacial foram combinadas a tarefas secundárias executivas de tempo de reação de escolha (CRT) e tarefas que exigiam recursos de atualização da informação (tarefa de tempo de reação de escolha para um item anterior CRT-1). Na tarefa CRT o participante deveria julgar dois tons auditivos como sendo de alta ou baixa frequência. Na tarefa CRT-1 esta resposta deveria ser atrasada em um item, ou seja, a resposta ao estímulo n só deveria ser dada quando o estímulo n + 1 fosse apresentado. As tarefas secundárias eram realizadas durante a apresentação dos estímulos e no intervalo de retenção das tarefas primárias. No primeiro experimento a capacidade máxima de armazenamento espacial e visual (span) de cada participante foi estabelecida em sessão pré-teste, e no segundo experimento o participante memorizou sequências de três a sete itens. Os resultados mostraram que, de modo geral, o desempenho dos participantes nas tarefas primárias foi prejudicado mediante a interferência na função de atualização de informações. As semelhanças entre a memória serial visual e a memória serial espacial foram: curvas de posição serial caracterizadas por primazia e recência; predominância de erros de transposição de deslocamento em um item da posição correta; efeito prejudicial do aumento do tamanho da sequência; queda do desempenho quando recursos executivos são reduzidos, principalmente os designados a sustentar a função executiva de atualização da informação. As diferenças entre os dois tipos de representação serial em geral foram: menor capacidade e precisão na representação de itens na memória visual em comparação à espacial; a memória visual é mais susceptível ao aumento da quantidade de itens para retenção e para este tipo de armazenamento não há uma diferenciação clara entre os efeitos dos dois tipos de interferência executiva (CRT e CRT-1), como pôde ser determinado para a tarefa espacial. Conclui-se que recursos executivos de atualização da informação participam dos mecanismos envolvidos com o registro da ordem serial dos eventos visuais e espaciais de maneira integrada aos recursos específicos do armazenador visuoespacial. Sugere-se que a memória visual conta com um mecanismo de registro da ordem serial semelhante à memória espacial, sendo que as diferenças entre os dois padrões de desempenho são atribuídas às especificidades no registro da identidade dos itens, e não na manutenção da ordem serial dos mesmos. Implicações para a compreensão da interação funcional entre recursos de armazenamento e processamento da informação na memória de trabalho são discutidos.In the multicomponent model of working memory is still unclear how the serial order of visual and spatial events is retained in memory. The literature suggests that the central executive resources (the attentional control system of working memory) are used to maintain the representation of serial position. More precisely, it is proposed that the executive function of updating information is involved with this process. This function makes continuous modification of mental representation to accommodate new information in the cognitive system. However, until now had not yet been determined whether there is a visual-spatial dissociation in use of executive function of updating information for the registration of serial order. The aim of this study was to investigate the involvement of the executive function of updating information in memory for the order of visual and spatial events. Participants were undergraduate students (n = 71) who performed memory tasks designed under the paradigm of dual-tasks. In this procedure the primary tasks of visual and spatial memory were combined with secondary executive tasks of choice reaction time (CRT) and tasks that occupied resources required to update the information (one-back choice reaction time CRT-1). In the CRT task the participant should judge two auditory tones as high or low frequency. In CRT-1 task this response should be delayed in one item, that is, the response to the n stimulus should only be given when the n + 1 stimulus was presented. The secondary tasks were performed during the presentation of the stimuli and the retention interval of the primary tasks. In the first experiment the capacity (span) to retain spatial and visual information was established in pre-test session, and in the second experiment the participants memorized sequences of three to seven items. The results showed that, overall, participants\' performance on primary tasks was impaired by interference on the updating information. The similarities between visual and spatial serial memory were: primacy and recency in serial position curves; most frequent serial position error of transposition in one item; detrimental effect of increasing the size of the sequence, performance impaired by the interference in the executive resources, especially those designed to support the executive function of updating information. The differences between the two types of serial representation, in general, were: smaller capacity and precision in the representation of visual items as compared to the spatial characteristics; the vulnerability of visual memory to the increasing the amount of items is bigger than in spatial memory, and for visual memory there is not a clear differentiation between the effects of two types of executive interference (CRT and CRT-1) as could be determined for the spatial task. We conclude that executive resources of updating information are part of the mechanisms involved in the registration of the serial order of visual and spatial events, and they work in an integrated manner to specific visuospatial resources. The data suggests that visual memory has a mechanism for registration of serial order like spatial memory, and the differences between the two patterns of performance are attributed to the maintenance of identity of the items, and not the maintenance of serial order. Implications for understanding the functional interaction between storage resources and processing of information in working memory are discussed.
19
Turconi, Eva. "Differential processing of quantity and order of numbers : neuropsychological, electrophysiological and behavioural evidence". Université catholique de Louvain, 2005. http://edoc.bib.ucl.ac.be:81/ETD-db/collection/available/BelnUcetd-09212005-170934/.
Testo completoAbstract (sommario):
Numbers convey different meanings when used in different contexts (Wiese, 2003). In a cardinal context, a number will tell us how many entities are in a set and convey quantity meaning. In an ordinal context, a number will refer to the relative position (or rank) of one element within a sequence; non-numerical ordered series (e.g. the letters of the alphabet) can also be used to provide meaningful order information. Because quantity and order are linked up with each other in the cognitive number domain (the larger the quantity a number refers to, the later it is located in the conventional number sequence), the question of whether they rely on some common or distinct underlying mechanism(s) is theoretically relevant and was addressed in the present thesis. Experimental studies showed evidence of both similarities (similar distance and SNARC effects, recruitment of parietal and frontal regions, and conjoint impairment or preservation after brain damage) and dissociations (different developmental course, dissociation after cerebral lesion, and specific behavioural markers) between quantity and order neuro-functional processes. The aim of the present thesis was to clarify the relationship between numerical quantity and order processing and to test the hypothesis that they rely on (at least partially) dissociated mechanisms. We tested this hypothesis in a single case study, an electrophysiological study and in two behavioural experiments. In the neuropsychological study, we reported the case of patient CO, who showed Gerstmann syndrome after bilateral parietal damage and became unable to process sequence order relations (e.g. he couldn't recite the number sequence backwards, nor decide whether a number, letter, day or month comes before or after a given target in the corresponding sequence, and he was unable to verify the order of items in a pair). Nonetheless, the patient had largely preserved quantity processing abilities (he could compare numbers and dot patterns to find the smaller or larger, and showed a standard distance effect, he could produce a number smaller or larger than a given target, and match dot patterns with Arabic numerals). Overall, CO's pattern of performance was interpreted as reflecting the involvement of different mechanisms when processing quantity or sequence order relations. Our electrophysiological study corroborated this finding since different spatio-temporal patterns of the distance effect were observed when subjects had to process numbers in a quantity comparison task or in an order judgment task. Quantity processing elicited an early distance effect over the P2p component on left parietal sites, whereas the distance effect was slightly delayed and bilaterally distributed in the numerical order judgment task; and this latter task additionally recruited prefrontal regions on a later (P3-counterpart) component. Finally, our behavioural study further emphasized the involvement of different mechanisms underlying the processing of quantity and numerical order and provided some evidence about the nature of these specific mechanisms. In the number comparison (quantity) task, the standard distance effect was proposed to reflect the involvement of a magnitude comparison mechanism; whereas the reverse distance effect observed in the numerical order verification task was taken as evidence for the recruitment of a serial search (recitation) process. Besides, the pair-order effect was also found to specifically affect order but not quantity judgments. Taken together, the data collected in the present thesis lend further support to the hypothesis that quantity and numerical order rely on distinct processing mechanisms that can be damaged selectively after cerebral lesions, that recruit similar brain areas but with a different spatio-temporal course and that show specific behavioural markers.
20
Antoine, Sophie. "The spatial nature of ordinal information in verbal working memory". Doctoral thesis, Universite Libre de Bruxelles, 2016. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/238833.
Testo completoAbstract (sommario):
At the beginning of this work, recent studies had evidenced a tight link between serial order in verbal working memory and space processing. In a first study, we investigated the nature of this link. By discarding the possibility that it results from conceptual associations, our results favoured the idea that the representation of serial order is intrinsically of a spatial nature. This led us to hypothesize that a deficit of space processing should be accompanied by a deficit of serial order. To test this hypothesis, we investigated verbal working memory abilities in a group of brain-damaged patients with hemispatial neglect, a syndrome characterized by a deficit of spatial attention. We showed that these patients have a specific deficit for serial order, as they showed difficulties when judging the ordinal relations between memorized items, whereas they were able to judge the identity of these items. This deficit of serial order was related to hemispatial neglect severity and to posterior parietal lesions. We formulated the hypothesis that the link between serial order and space results from the overlap of brain networks subtending these cognitive processes, at the level of the posterior parietal cortex. To test this hypothesis, we used transcranial magnetic stimulation (TMS) to temporarily disrupt this area in healthy participants, with the prediction that TMS would induce a similar bias when judging the position of a landmark on horizontal lines (spatial task), and when judging the position of an item in memorized sequences (ordinal task). In line with previous studies, TMS induced a bias in the spatial task. However, contrary to our prediction, TMS over the same area in the same participants did not induce a similar bias in the ordinal task.Doctorat en Sciences psychologiques et de l'éducation
info:eu-repo/semantics/nonPublished
21
Gamsby, Christopher William. "Working Memory Updating using Meaningful Trigraphs". Bowling Green State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1459339645.
Testo completo
22
Rehn, Martin. "Aspects of memory and representation in cortical computation". Doctoral thesis, KTH, Numerisk Analys och Datalogi, NADA, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4161.
Testo completoAbstract (sommario):
Denna avhandling i datalogi föreslår modeller för hur vissa beräkningsmässiga uppgifter kan utföras av hjärnbarken. Utgångspunkten är dels kända fakta om hur en area i hjärnbarken är uppbyggd och fungerar, dels etablerade modellklasser inom beräkningsneurobiologi, såsom attraktorminnen och system för gles kodning. Ett neuralt nätverk som producerar en effektiv gles kod i binär mening för sensoriska, särskilt visuella, intryck presenteras. Jag visar att detta nätverk, när det har tränats med naturliga bilder, reproducerar vissa egenskaper (receptiva fält) hos nervceller i lager IV i den primära synbarken och att de koder som det producerar är lämpliga för lagring i associativa minnesmodeller. Vidare visar jag hur ett enkelt autoassociativt minne kan modifieras till att fungera som ett generellt sekvenslärande system genom att utrustas med synapsdynamik. Jag undersöker hur ett abstrakt attraktorminnessystem kan implementeras i en detaljerad modell baserad på data om hjärnbarken. Denna modell kan sedan analyseras med verktyg som simulerar experiment som kan utföras på en riktig hjärnbark. Hypotesen att hjärnbarken till avsevärd del fungerar som ett attraktorminne undersöks och visar sig leda till prediktioner för dess kopplingsstruktur. Jag diskuterar också metodologiska aspekter på beräkningsneurobiologin idag.In this thesis I take a modular approach to cortical function. I investigate how the cerebral cortex may realise a number of basic computational tasks, within the framework of its generic architecture. I present novel mechanisms for certain assumed computational capabilities of the cerebral cortex, building on the established notions of attractor memory and sparse coding. A sparse binary coding network for generating efficient representations of sensory input is presented. It is demonstrated that this network model well reproduces the simple cell receptive field shapes seen in the primary visual cortex and that its representations are efficient with respect to storage in associative memory. I show how an autoassociative memory, augmented with dynamical synapses, can function as a general sequence learning network. I demonstrate how an abstract attractor memory system may be realised on the microcircuit level -- and how it may be analysed using tools similar to those used experimentally. I outline some predictions from the hypothesis that the macroscopic connectivity of the cortex is optimised for attractor memory function. I also discuss methodological aspects of modelling in computational neuroscience.
QC 20100916
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Oberhauser, Joseph Q. "Design, Construction, Control, and Analysis of Linear Delta Robot". Ohio University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1460045979.
Testo completo
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Karlsson, Isak. "Order in the random forest". Doctoral thesis, Stockholms universitet, Institutionen för data- och systemvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-142052.
Testo completoAbstract (sommario):
In many domains, repeated measurements are systematically collected to obtain the characteristics of objects or situations that evolve over time or other logical orderings. Although the classification of such data series shares many similarities with traditional multidimensional classification, inducing accurate machine learning models using traditional algorithms are typically infeasible since the order of the values must be considered. In this thesis, the challenges related to inducing predictive models from data series using a class of algorithms known as random forests are studied for the purpose of efficiently and effectively classifying (i) univariate, (ii) multivariate and (iii) heterogeneous data series either directly in their sequential form or indirectly as transformed to sparse and high-dimensional representations. In the thesis, methods are developed to address the challenges of (a) handling sparse and high-dimensional data, (b) data series classification and (c) early time series classification using random forests. The proposed algorithms are empirically evaluated in large-scale experiments and practically evaluated in the context of detecting adverse drug events. In the first part of the thesis, it is demonstrated that minor modifications to the random forest algorithm and the use of a random projection technique can improve the effectiveness of random forests when faced with discrete data series projected to sparse and high-dimensional representations. In the second part of the thesis, an algorithm for inducing random forests directly from univariate, multivariate and heterogeneous data series using phase-independent patterns is introduced and shown to be highly effective in terms of both computational and predictive performance. Then, leveraging the notion of phase-independent patterns, the random forest is extended to allow for early classification of time series and is shown to perform favorably when compared to alternatives. The conclusions of the thesis not only reaffirm the empirical effectiveness of random forests for traditional multidimensional data but also indicate that the random forest framework can, with success, be extended to sequential data representations.
25
Basson, Dirk (Dirk Johannes). "Parametrizing finite order automorphisms of power series rings". Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/5243.
Testo completoAbstract (sommario):
Thesis (MSc (Mathematics))--University of Stellenboswch, 2010.ENGLISH ABSTRACT: In the work of Green and Matignon it was shown that the Oort-Sekiguchi conjecture is equivalent to a local question of lifting automorphisms of power series rings. The Oort-Sekiguchi conjecture asks when an algebraic curve in characteristic p can be lifted to a relative curve in characteristic 0, while keeping the same automorphism group. The local formulation asks when an automorphism of a power series ring over a field k of characteristic p can be lifted to an automorphism of a power series ring over a discrete valuation ring with residue field k of the same order as the original automorphism. This thesis looks at the local formulation and surveys many of the results for this case. At the end it presents a new theorem giving a Hensel's Lemma type sufficient condition under which lifting is possible.
AFRIKAANSE OPSOMMING: Green en Matignon het bewys dat die Oort-Sekiguchi vermoede ekwivalent is aan `n lokale vraag oor of outomorfismes van magsreeksringe gelig kan word. Die Oort-Sekiguchi vermoede vra of `n algebra ese kromme in karakteristiek p gelig kan word na `n relatiewe kromme in karakteristiek 0, terwyl dit dieselfde outomorfisme groep behou. Die lokale vraag vra wanneer `n outomorfisme van `n magsreeksring oor `n liggaam k van karakteristiek p gelig kan word na `n outomorfisme van `n magsreeksring oor `n diskrete waarderingsring met residuliggaam k, terwyl dit dieselfde orde behou as die aanvanklike outomorfisme. Hierdie tesis fokus op die lokale vraag en bied `n opsomming van baie bekende resultate vir hierdie geval. Aan die einde word `n nuwe stelling aangebied wat voorwaardes stel waaronder hierdie vraag positief beantwoord kan word.
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Breitenbucher, Jon W. "Third order mock theta functions for multivariable symplectic hypergeometric series /". The Ohio State University, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486394475981188.
Testo completo
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DESHMUKH, DINAR V. "PHYSICS BASED REDUCED ORDER MODELS FOR FRICTIONAL CONTACTS". University of Cincinnati / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1115997302.
Testo completo
28
Oh, Sang Min. "Switching linear dynamic systems with higher-order temporal structure". Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/29698.
Testo completoAbstract (sommario):
Thesis (Ph.D)--Computing, Georgia Institute of Technology, 2010.Committee Chair: Dellaert, Frank; Committee Co-Chair: Rehg, James; Committee Member: Bobick, Aaron; Committee Member: Essa, Irfan; Committee Member: Smyth, Padhraic. Part of the SMARTech Electronic Thesis and Dissertation Collection.
29
Mihalicek, Vedrana. "Serbo-Croatian Word Order: A Logical Approach". The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1354280257.
Testo completo
30
Lan, Yang. "Computational Approaches for Time Series Analysis and Prediction. Data-Driven Methods for Pseudo-Periodical Sequences". Thesis, University of Bradford, 2009. http://hdl.handle.net/10454/4317.
Testo completoAbstract (sommario):
Time series data mining is one branch of data mining. Time series analysis and prediction have always played an important role in human activities and natural sciences. A Pseudo-Periodical time series has a complex structure, with fluctuations and frequencies of the times series changing over time. Currently, Pseudo-Periodicity of time series brings new properties and challenges to time series analysis and prediction. This thesis proposes two original computational approaches for time series analysis and prediction: Moving Average of nth-order Difference (MANoD) and Series Features Extraction (SFE). Based on data-driven methods, the two original approaches open new insights in time series analysis and prediction contributing with new feature detection techniques. The proposed algorithms can reveal hidden patterns based on the characteristics of time series, and they can be applied for predicting forthcoming events. This thesis also presents the evaluation results of proposed algorithms on various pseudo-periodical time series, and compares the predicting results with classical time series prediction methods. The results of the original approaches applied to real world and synthetic time series are very good and show that the contributions open promising research directions.
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Mendez, Barrios César. "Low-Order Controllers for Time-Delay Systems : an Analytical Approach". Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00719477.
Testo completoAbstract (sommario):
The research work presented in this thesis concern to the stability analysis of linear time-delay systems with low-order controllers. This thesis is divided into three parts.The first part of the thesis focus on the study of linear SISO (single-input/single-output) systems with input/output delays, where the feedback loop is closed with a controller of PID-type. Inspired by the geometrical approach developed by Gu et al. we propose an analytical method to find the stability regions of all stabilizing controllers of PID-type for the time-delay system. Based on this same approach, we propose an algorithm to calculate the degree of fragility of a given controller of PID- type (PI, PD and PID).The second part of the thesis focuses on the stability analysis of linear systems under an NCS (Networked System Control) based approach. More precisely, we first focus in the stabilization problem by taking into account the induced network delays and the effects induced by the sampling period. To carry out such an analysis we have adopted an eigenvalue perturbation-based approach.Finally, in the third part of the thesis we tackle certain problems concerning to the behavior of the zeros of a certain class of sampled-data SISO systems. More precisely, given a continuous-time system, we obtain the sampling intervals guaranteeing the invariance of the number of unstable zeros in each interval. To perform such an analysis, we adopt an eigenvalue perturbation-based approach.
32
Evangelista, Dilson Henrique Ramos. "Análise espectral através de cruzamentos de ordem superior". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2000. http://hdl.handle.net/10183/126768.
Testo completoAbstract (sommario):
Muitas vezes, é de interesse na análise de séries temporais verificar se existe periodicidade numa série dada. Para isso é empregada a análise espectral clássica, utilizando a função densidade espectral e a função periodograma. O objeti,·o desse trabalho é fornecer uma análise espectral alternativa baseada em cruzamentos de ordem superior, ou HOC. Enunciamos um teorema que mostra a relação entre análise espectral clássica e análise espectral utilizando cruzamento de ordem superior.In the analysis of time series, it is often intercsting to seek for periodicities in a given series, where the classical spectral analysis is used through the spectral density and periodogram functions . The goal of this work is to supply an alternative spectral analysis technique based on Higher Order Crossings or HOC. A theorem showing the relationship between classical spcctral analysis and Higher Order Crossings is given.
33
Elezovic, Suad. "Modeling financial volatility : A functional approach with applications to Swedish limit order book data". Doctoral thesis, Umeå universitet, Statistik, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-18757.
Testo completoAbstract (sommario):
This thesis is designed to offer an approach to modeling volatility in the Swedish limit order market. Realized quadratic variation is used as an estimator of the integrated variance, which is a measure of the variability of a stochastic process in continuous time. Moreover, a functional time series model for the realized quadratic variation is introduced. A two-step estimation procedure for such a model is then proposed. Some properties of the proposed two-step estimator are discussed and illustrated through an application to high-frequency financial data and simulated experiments. In Paper I, the concept of realized quadratic variation, obtained from the bid and ask curves, is presented. In particular, an application to the Swedish limit order book data is performed using signature plots to determine an optimal sampling frequency for the computations. The paper is the first study that introduces realized quadratic variation in a functional context. Paper II introduces functional time series models and apply them to the modeling of volatility in the Swedish limit order book. More precisely, a functional approach to the estimation of volatility dynamics of the spreads (differences between the bid and ask prices) is presented through a case study. For that purpose, a two-step procedure for the estimation of functional linear models is adapted to the estimation of a functional dynamic time series model. Paper III studies a two-step estimation procedure for the functional models introduced in Paper II. For that purpose, data is simulated using the Heston stochastic volatility model, thereby obtaining time series of realized quadratic variations as functions of relative quantities of shares. In the first step, a dynamic time series model is fitted to each time series. This results in a set of inefficient raw estimates of the coefficient functions. In the second step, the raw estimates are smoothed. The second step improves on the first step since it yields both smooth and more efficient estimates. In this simulation, the smooth estimates are shown to perform better in terms of mean squared error. Paper IV introduces an alternative to the two-step estimation procedure mentioned above. This is achieved by taking into account the correlation structure of the error terms obtained in the first step. The proposed estimator is based on seemingly unrelated regression representation. Then, a multivariate generalized least squares estimator is used in a first step and its smooth version in a second step. Some of the asymptotic properties of the resulting two-step procedure are discussed. The new procedure is illustrated with functional high-frequency financial data.
34
Yip, Martha. "Genus one partitions". Thesis, University of Waterloo, 2006. http://hdl.handle.net/10012/2933.
Testo completoAbstract (sommario):
We obtain a tight upper bound for the genus of a partition, and calculate the number of partitions of maximal genus. The generating series for genus zero and genus one rooted hypermonopoles is obtained in closed form by specializing the genus series for hypermaps. We discuss the connection between partitions and rooted hypermonopoles, and suggest how a generating series for genus one partitions may be obtained via the generating series for genus one rooted hypermonopoles. An involution on the poset of genus one partitions is constructed from the associated hypermonopole diagrams, showing that the poset is rank-symmetric. Also, a symmetric chain decomposition is constructed for the poset of genus one partitions, which consequently shows that it is strongly Sperner.
35
Zamora-Zapata, Carlos. "Crítica Contextural: El corazón del instante de Alberto Blanco: Ensayo de un Método". UKnowledge, 2014. http://uknowledge.uky.edu/hisp_etds/14.
Testo completoAbstract (sommario):
The most common approaches to arranged Poetic Collection are the chronological and the bibliographical orders, that is, the ones that privileges a book that normally would be called an anthology: the arrangements of poems following the order of the compositions of the poems (chronological), or the order of previous publications (bibliographical). "El corazón del instante" (The Heart of the Instant, 1998) by the Mexican poet Alberto Blanco (Mexico City, 1951) is a collection of twelve books of poems in one volume. The books in the collection --or the “chapters”, as Alberto Blanco call them in his “Introductory Note” of the book --are presented not in a bibliographical or chronological order, but in accordance to an order that the poet imposed to the book himself. The structural proposal of the book contradicts the definition of any “normal” anthology. In order to approach a book of such nature, we would use and apply the concept of “contextural poetics”, introduced by Neil Fraistat in his book "Poems in Their Place (The Intertextuality and Order of Poetic Collections)", published in 1986. This approach suggest that a PoetryCollection or a simple Book of Poems should be able to be read as one long and single poem. Some of the key concepts of my investigation are already listed in the subtitle of the book: “Intertextuality” and “Order”, and we would like to add “Context”. The concept of “contextural poetics” is explain by Fraistat as the resultant of the context of the book where the poems are reunited, the interaction among poems, and the “contexture” that derives from that interaction. Many critics claim that in every long poem has to exist some kind of narrative, idea that brings other important concepts that we have to approach, like long poem, poetic sequences and poetic series that would complement our study. We believe that the book "Libertad bajo Palabra [1935-1957]" by Octavio Paz, in the critical edition of Enrico Mario Santí, is the implicit model of "El corazón del instante". Our goal is to try to determine what is "El corazón del instante", because in the “Introductory Note” the poets claim that the book is not an anthology, but a “complete cycle of poems”. That is what we would try to find out: what is “a complete cycle of poems”.
36
Šimková, Marcela. "Popis provozu lékárny Helios pomocí statistických metod". Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2013. http://www.nusl.cz/ntk/nusl-224275.
Testo completoAbstract (sommario):
Master thesis is dealing with the application of particular statistical methods for a description of pharmacy Helios operation. The attention is primarily focused on stock management within the scope of independent demand model, where the related performance indicators of weekly revenues, daily revenues and expenditures per customer are subsequently exposed to thorough analysis. In addition, one of the main goals of this thesis can be identified as the intention to create an application for continuous monitoring of available stock, where their depletion below the specified level would be reported. This thesis should also provide a certain guidelines how the aforementioned application could be integrated within the existing information system in order to automate the process of orders processing.
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Scussel, Oscar. "On the use of Volterra series in structural dynamics : contributions from input-output to output-only analysis and identification /". Ilha Solteira, 2017. http://hdl.handle.net/11449/150506.
Testo completoAbstract (sommario):
Orientador: Samuel da SilvaResumo: Muitas aplicações da engenharia envolvem estruturas essencialmente não-lineares onde várias técnicas têm sido recentemente estudadas e investigadas por muitos pesquisadores. Dentre as várias abordagems, as que usam séries de Volterra têm apresentado propriedades úteis para fornecer um melhor entendimento para identificação e análise. Neste contexto, a presente tese propõem novas contribuições em como usar as séries de Volterra para caracterização, identificação e análise dinâmica de sistemas não-lineares usando sinais de entrada e saída e sinais somente de saída. Inicialmente, apresenta-se uma metodologia para análise de sistemas mecânicos não-lineares através das funções de resposta em frequência de alta-ordem (HOFRFs) e o conceito de HOFRFs estendidas com dados apenas de saída é introduzido e descrito em detalhes. Após isso, uma abordagem para identificação de sistemas não-lineares com base nas séries de Volterra através da expansão na base ortonormal de Kautz é proposta. Essa técnica permite identificar os seus núcleos mais facilmente e permite separar as contribuições dos termos lineares e não-lineares usando somente sinais de saída. Além disso, uma metodologia para análise modal de sistemas fracamente não-lineares sujeito a excitações com vários níveis de amplitude é também apresentada. A contribuição desse novo método reside no fato de que as HOFRFs são simplesmente estimadas como função das FRFs lineares. Basicamente, essa metodologia estende o conceito ... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: Most recent engineering applications involve structures essentially nonlinear where several techniques have been recently studied and investigated by many researchers. Among them, the methods based on Volterra series expansion have presented powerful properties to provide a better understanding for identification and analysis. In this context, the present thesis proposes new contributions in how to use Volterra series for characterization, identification and dynamical analysis of nonlinear systems based on input and output signals and output-only signals. Initially, a methodology for analysis of nonlinear mechanical systems through higher-order frequency response functions (HOFRFs) is presented and the concept of extended HOFRFs based on output-only is introduced and described in detail. Afterwards, an approach for identification of nonlinear systems based on Volterra series through the expansion onto orthonormal Kautz basis is proposed. This technique allows to identify the Volterra kernels easily and enable to split the contribution of the linear and nonlinear terms using input-output as well as output-only signals. Furthermore, a methodology for modal analysis of weakly nonlinear systems under multilevel excitation is also proposed. The contribution of this new approach lies in the fact that HOFRFs are simply computed as functions of the linear FRFs. Basically, it extends the conventional experimental modal analysis methods in order to characterize and treat no... (Complete abstract click electronic access below)
Doutor
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Perez, Eder de Almeida. "Descritor de movimento baseado em tensor e histograma de gradientes". Universidade Federal de Juiz de Fora (UFJF), 2012. https://repositorio.ufjf.br/jspui/handle/ufjf/3549.
Testo completoAbstract (sommario):
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CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
O reconhecimento de padrões de movimentos tem se tornado um campo de pesquisa muito atrativo nos últimos anos devido, entre outros fatores, à grande massificação de dados em vídeos e a tendência na criação de interfaces homem-máquina que utilizam expressões faciais e corporais. Esse campo pode ser considerado um dos requisitos chave para análise e entendimento de vídeos. Neste trabalho é proposto um descritor de movimentos baseado em tensores de 2a ordem e histogramas de gradientes (HOG - Histogram of Oriented Gradients). O cálculo do descritor é rápido, simples e eficaz. Além disso, nenhum aprendizado prévio é necessário sendo que a adição de novas classes de movimentos ou novos vídeos não necessita de mudanças ou que se recalculem os descritores já existentes. Cada quadro do vídeo é particionado e em cada partição calcula-se o histograma de gradientes no espaço e no tempo. A partir daí calcula-se o tensor do quadro e o descritor final é formado por uma série de tensores de cada quadro. O descritor criado é avaliado classificando-se as bases de vídeos KTH e Hollywood2, utilizadas na literatura atual, com um classificador Máquina Vetor Suporte (SVM). Os resultados obtidos na base KTH são próximos aos descritores do estado da arte que utilizam informação local do vídeo. Os resultados obtidos na base Hollywood2 não superam o estado da arte, mas são próximos o suficiente para concluirmos que o método proposto é eficaz. Apesar de a literatura apresentar descritores que possuem resultados superiores na classificação, suas abordagens são complexas e de alto custo computacional.
The motion pattern recognition has become a very attractive research field in recent years due to the large amount of video data and the creation of human-machine interfaces that use facial and body expressions. This field can be considered one of the key requirements for analysis and understanding in video. This thesis proposes a motion descriptor based on second order tensor and histograms of oriented gradients. The calculation of the descriptor is fast, simple and effective. Furthermore, no prior knowledge of data basis is required and the addition of new classes of motion and videos do not need to recalculate the existing descriptors. The frame of a video is divided into a grid and the histogram of oriented gradients is computed in each cell. After that, the frame tensor is computed and the final descriptor is built by a series of frame tensors. The descriptor is evaluated in both KTH and Hollywood2 data basis, used in the current literature, with a Support Vector Machine classifier (SVM). The results obtained on the basis KTH are very close to the descriptors of the state-of-the-art that use local information of the video. The results obtained on the basis Hollywood2 not outweigh the state-of-the-art but are close enough to conclude that the proposed method is effective. Although the literature presents descriptors that have superior results, their approaches are complex and with computational cost.
39
Scussel, Oscar [UNESP]. "On the use of Volterra series in structural dynamics: contributions from input-output to output-only analysis and identification". Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/150506.
Testo completoAbstract (sommario):
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Muitas aplicações da engenharia envolvem estruturas essencialmente não-lineares onde várias técnicas têm sido recentemente estudadas e investigadas por muitos pesquisadores. Dentre as várias abordagems, as que usam séries de Volterra têm apresentado propriedades úteis para fornecer um melhor entendimento para identificação e análise. Neste contexto, a presente tese propõem novas contribuições em como usar as séries de Volterra para caracterização, identificação e análise dinâmica de sistemas não-lineares usando sinais de entrada e saída e sinais somente de saída. Inicialmente, apresenta-se uma metodologia para análise de sistemas mecânicos não-lineares através das funções de resposta em frequência de alta-ordem (HOFRFs) e o conceito de HOFRFs estendidas com dados apenas de saída é introduzido e descrito em detalhes. Após isso, uma abordagem para identificação de sistemas não-lineares com base nas séries de Volterra através da expansão na base ortonormal de Kautz é proposta. Essa técnica permite identificar os seus núcleos mais facilmente e permite separar as contribuições dos termos lineares e não-lineares usando somente sinais de saída. Além disso, uma metodologia para análise modal de sistemas fracamente não-lineares sujeito a excitações com vários níveis de amplitude é também apresentada. A contribuição desse novo método reside no fato de que as HOFRFs são simplesmente estimadas como função das FRFs lineares. Basicamente, essa metodologia estende o conceito de métodos convencionais de analise modal experimental para caracterizar e tratar efeitos não-lineares. Os resultados via exemplos numéricos e experimentais apresentados ao longo da tese mostram as contribuições, benefícios e eficácia da proposta.
Most recent engineering applications involve structures essentially nonlinear where several techniques have been recently studied and investigated by many researchers. Among them, the methods based on Volterra series expansion have presented powerful properties to provide a better understanding for identification and analysis. In this context, the present thesis proposes new contributions in how to use Volterra series for characterization, identification and dynamical analysis of nonlinear systems based on input and output signals and output-only signals. Initially, a methodology for analysis of nonlinear mechanical systems through higher-order frequency response functions (HOFRFs) is presented and the concept of extended HOFRFs based on output-only is introduced and described in detail. Afterwards, an approach for identification of nonlinear systems based on Volterra series through the expansion onto orthonormal Kautz basis is proposed. This technique allows to identify the Volterra kernels easily and enable to split the contribution of the linear and nonlinear terms using input-output as well as output-only signals. Furthermore, a methodology for modal analysis of weakly nonlinear systems under multilevel excitation is also proposed. The contribution of this new approach lies in the fact that HOFRFs are simply computed as functions of the linear FRFs. Basically, it extends the conventional experimental modal analysis methods in order to characterize and treat nonlinear effects. The results based on numerical and experimental examples presented along the thesis show the contributions, benefits and effectiveness of the proposal.
FAPESP: 2012/09135-3
CNPq: 47058/2012-0
CNPq: 203610/2014-8
40
Paditz, Ludwig. "Über mittlere Abweichungen". Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-112977.
Testo completoAbstract (sommario):
In diesem Artikel werden notwendige und hinreichende Bedingungen für die Gültigkeit von Grenzwertsätzen für mittlere Abweichungen untersucht. In der Terminilogie von J.V.LINNIK (1971) werden die x-Bereiche für mittlere Abweichungen gewöhnlich als "sehr enge" Zonen der integralen normalen Anziehung bezeichnet. Darüber hinaus werden die Restglieder untersucht, die in den asymptotischen Beziehungen auftreten. Die Ordnung der Konvergenzgeschwindigkeit wird angegeben. Frühere Ergebnisse einiger Autoren werden verallgemeinert. Abschließend werden einige Literaturhinweise angegebenIn this paper we study necessary and sufficient conditions for the validity of limit theorems on moderate deviations. Usually x-zones for moderate deviations are called in the terminilogy by YU.V.LINNIK (1971) "very narrow" zones of integral normal attraction. Moreover we analyse the remainder term appearing in the asymptotic relations. Informations on the order of the rate of convergence are given. Earlier results by several authors are generalized. Finally some references are given
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Soale, Abdul-Nasah. "Spatio-Temporal Analysis of Point Patterns". Digital Commons @ East Tennessee State University, 2016. https://dc.etsu.edu/etd/3120.
Testo completoAbstract (sommario):
In this thesis, the basic tools of spatial statistics and time series analysis are applied to the case study of the earthquakes in a certain geographical region and time frame. Then some of the existing methods for joint analysis of time and space are described and applied. Finally, additional research questions about the spatial-temporal distribution of the earthquakes are posed and explored using statistical plots and models. The focus in the last section is in the relationship between number of events per year and maximum magnitude and its effect on how clustered the spatial distribution is and the relationship between distances in time and space in between consecutive events as well as the distribution of the distances.
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Lebre, Sophie. "Stochastic process analysis for Genomics and Dynamic Bayesian Networks inference". Phd thesis, Université d'Evry-Val d'Essonne, 2007. http://tel.archives-ouvertes.fr/tel-00260250.
Testo completoAbstract (sommario):
This thesis is dedicated to the development of statistical and computational methods for the analysis of DNA sequences and gene expression time series.First we study a parsimonious Markov model called Mixture Transition Distribution (MTD) model which is a mixture of Markovian transitions. The overly high number of constraints on the parameters of this model hampers the formulation of an analytical expression of the Maximum Likelihood Estimate (MLE). We propose to approach the MLE thanks to an EM algorithm. After comparing the performance of this algorithm to results from the litterature, we use it to evaluate the relevance of MTD modeling for bacteria DNA coding sequences in comparison with standard Markovian modeling.
Then we propose two different approaches for genetic regulation network recovering. We model those genetic networks with Dynamic Bayesian Networks (DBNs) whose edges describe the dependency relationships between time-delayed genes expression. The aim is to estimate the topology of this graph despite the overly low number of repeated measurements compared with the number of observed genes.
To face this problem of dimension, we first assume that the dependency relationships are homogeneous, that is the graph topology is constant across time. Then we propose to approximate this graph by considering partial order dependencies. The concept of partial order dependence graphs, already introduced for static and non directed graphs, is adapted and characterized for DBNs using the theory of graphical models. From these results, we develop a deterministic procedure for DBNs inference.
Finally, we relax the homogeneity assumption by considering the succession of several homogeneous phases. We consider a multiple changepoint
regression model. Each changepoint indicates a change in the regression model parameters, which corresponds to the way an expression level depends on the others. Using reversible jump MCMC methods, we develop a stochastic algorithm which allows to simultaneously infer the changepoints location and the structure of the network within the phases delimited by the changepoints.
Validation of those two approaches is carried out on both simulated and real data analysis.
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Cavalcante, Charles Casimiro. "Sobre separação cega de fontes : proposições e analise de estrategias para processamento multi-usuario". [s.n.], 2004. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260272.
Testo completoAbstract (sommario):
Orientadores: João Marcos Travassos Romano, Francisco Rodrigo Porto CavalcantiTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação
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Resumo: Esta tese é dedicada ao estudo de tecnicas de separação cega de fontes aplicadas ao contexto de processamento multiusuario em comunicações digitais. Utilizando estrategias de estimação da função de densidade de probabilidade (fdp), são propostos dois metodos de processamento multiusuario que permitem recuperar os sinais transmitidos pela medida de similaridade de Kullback-Leibler entre a fdp dos sinais a saida do dispositivo de separação e um modelo parametrico que contem as caracteristicas dos sinais transmitidos. Alem desta medida de similaridade, são empregados diferentes metodos que garantem a descorrelação entre as estimativas das fontes de tal forma que os sinais recuperados sejam provenientes de diferentes fontes. E ainda realizada a analise de convergencia dos metodos e suas equivalencias com tecnicas classicas resultando em algumas importantes relações entre criterios cegos e supervisionados, tais como o criterio proposto e o criterio de maxima a posteriori. Estes novos metodos aliam a capacidade de recuperação da informação uma baixa complexidade computacional. A proposição de metodos baseados na estimativa da fdp permitiu a realização de um estudo sobre o impacto das estatisticas de ordem superior em algoritmos adaptativos para separação cega de fontes. A utilização da expansão da fdp em series ortonormais permite avaliar atraves dos cumulantes a dinamica de um processo de separação de fontes. Para tratar com problemas de comunicação digital e proposta uma nova serie ortonormal, desenvolvida em torno de uma função de densidade de probabilidade dada por um somatorio de gaussianas. Esta serie e utilizada para evidenciar as diferenças em relação ao desempenho em tempo real ao se reter mais estatisticas de ordem superior. Simulações computacionais são realizadas para evidenciar o desempenho das propostas frente a tecnicas conhecidas da literatura em varias situações de necessidade de alguma estrategia de recuperação de sinais
Abstract: This thesis is devoted to study blind source separation techniques applied to multiuser processing in digital communications. Using probability density function (pdf) estimation strategies, two multiuser processing methods are proposed. They aim for recovering transmitted signal by using the Kullback-Leibler similarity measure between the signals pdf and a parametric model that contains the signals characteristics. Besides the similarity measure, different methods are employed to guarantee the decorrelation of the sources estimates, providing that the recovered signals origin from different sources. The convergence analysis of the methods as well as their equivalences with classical techniques are presented, resulting on important relationships between blind and supervised criteria such as the proposal and the maximum a posteriori one. Those new methods have a good trade-off between the recovering ability and computational complexity. The proposal os pdf estimation-based methods had allowed the investigation on the impact of higher order statistics on adaptive algorithms for blind source separation. Using pdf orthonormal series expansion we are able to evaluate through cumulants the dynamics of a source separation process. To be able to deal with digital communication signals, a new orthonormal series expansion is proposed. Such expansion is developed in terms of a Gaussian mixture pdf. This new expansion is used to evaluate the differences in real time processing when we retain more higher order statistics. Computational simulations are carried out to stress the performance of the proposals, faced to well known techniques reported in the literature, under the situations where a recovering signal strategy is required.
Doutorado
Telecomunicações e Telemática
Doutor em Engenharia Elétrica
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Amrane, Amazigh. "Posets série-parallèles transfinis : automates, logiques et théories équationnelles". Thesis, Normandie, 2020. http://www.theses.fr/2020NORMR102.
Testo completoAbstract (sommario):
Nous étudions dans cette thèse des structures généralisant la notion classique de mot. Elles sont construites à partir d’un ensemble partiellement ordonné (partially ordered set ou poset) vérifiant les propriétés suivantes : — elles ne contiennent pas 4 éléments distincts x, y, z, t dont l’ordre relatif est exactement x < y, z < y, z < t (posets dits sans N) ; — les chaînes sont des ordres linéaires dénombrables et dispersés ; — les antichaînes sont finies ; et chaque élément est étiqueté par une lettre d’un alphabet fini. De manière équivalente, la classe des posets que nous considérons est la plus petite construite à partir du poset vide et du singleton, fermée par les produits séquentiel et parallèle finis, et le produit ω et son renversé −ω (posets série-parallèles). Elle est une généralisation à la fois des posets série-parallèles finis étiquetés, en y ajoutant l’infinitude, et des mots transfinis, en affaiblissant l’ordre total des éléments en ordre partiel. En informatique, les posets série-parallèles finis trouvent leur intérêt dans la modélisation des processus concurrents basés sur les primitives fork/join, et les mots transfinis dans l’étude de la récursivité. Les langages rationnels de ces posets étiquetés sont définis à partir d’expressions et d’automates équivalents introduits par Bedon et Rispal, qui généralisent le cas des mots transfinis (Bruyère et Carton) et celui des posets finis (Lodaya et Weil). Dans cette thèse nous les étudions du point de vue de la logique. Nous généralisons en particulier le théorème de Büchi, Elgot et Trakhtenbrot, établissant pour le cas des langages de mots finis l’égalité entre la classe des langages rationnels et celle des langages définissables en logique monadique du second ordre (MSO). La logique mise en oeuvre est une extension de MSO par de l’arithmétique de Presburger. Nous nous intéressons également à certaines variétés d’algèbres de posets. Nous montrons que l’algèbre dont l’univers est la classe des posets série-parallèles transfinis et dont les opérations sont les produits séquentiel et parallèle finis et les produits (resp. puissances) ω et − ω est libre dans la variété correspondante V (resp. V 0). Nous en déduisons la liberté de la même algèbre sans le produit parallèle ou le produit − ω. Enfin, nous montrons que la théorie équationnelle de V 0 est décidable. Ce sont notamment des généralisations de résultats similaires de Bloom et Choffrut pour la variété d’algèbres de mots de longueur inférieure à ω!, de Choffrut et Ésik pour la variété d’algèbres de posets sans N dont les antichaînes sont finies et les chaînes sont de longueur inférieure à ω! et ceux de Bloom et Ésik pour la variété d’algèbres de mots sur les ordres linéaires dénombrables et dispersésWe study in this thesis structures extending the classical notion of word. They are built from a partially ordered set (poset) verifying the following properties : — they do not contain 4 distinct elements x, y, z, t whose relative order is exactly x < y, z < y, z < t (posets called N-free) ; — their chains are countable and scattered linear orderings ; — their antichains are finite ; and each element is labeled by a letter of a finite alphabet. Equivalently, the class of posets which we consider is the smallest one built from the empty poset and the singleton, and being closed under sequential and parallel products, and ω product and its backward ordering −ω (series-parallel posets). It is a generalization of both of finite series-parallel labeled posets, by adding infinity, and transfinite words, by weakening the total ordering of the elements to a partial ordering. In computer science, series-parallel posets find their interest in modeling concurrent processes based on fork/join primitives, and transfinite words in the study of recursion. The rational languages of these labeled posets are defined from expressions and equivalent automata introduced by Bedon and Rispal, which generalize thecase of transfinite words (Bruyère and Carton) and the one of finite posets (Lodaya and Weil). In this thesis we study such structures from the logic point of view. In particular, we generalize the Büchi-Elgot-Trakhtenbrot theorem, establishing in the case of finite words the correspondence between the class of rational languages and the one of languages definable in monadic second order logic (MSO). The implemented logic is an extension of MSO by Presburger arithmetic. We focus on some varieties of posets algebras too. We show that the algebra whose universe is the class of transfinite series-parallel posets and whose operations are the sequential and parallel products and the ω and −ω products (resp. powers) is free in the corresponding variety V (resp. V 0). We deduce the freeness of the same algebra without parallel or −ω product. Finally, we showthat the equational theory of V 0 is decidable. These results are, in particular, generalizations of similar results of Bloom and Choffrut on the variety of algebras of words whose length are less than ω!, of Choffrut and Ésik on the variety of algebras of N-free posets whose antichains are finite and whose chains are less than ω! and those of Bloom and Ésik on the variety of algebras of words indexed by countable and scattered linear orderings
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REIS, Bruno Trindade. "Séries de Hilbert de algumas álgebras associadas a grafos orientados via cohomologia de conjuntos parcialmente ordenados". Universidade Federal de Goiás, 2011. http://repositorio.bc.ufg.br/tede/handle/tde/1948.
Testo completoAbstract (sommario):
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Previous issue date: 2011-08-31We begin with a definition of the algebras Qn, who originated the study of algebra associated to directed graphs. Then, we define key concepts such as Hilbert series, graded and filtered algebras. Among the quadratic algebras, we introduce the Koszul algebras. The Hilbert series is a useful tool to study the Koszulity of a quadratic algebra. The homological interpretation of the coefficients of the Hilbert series of algebras associated with direct graphs allowed us to give conditions Koszulity these algebras in terms of the homological properties of the graph. We use this interpretation to construct algebras with Hilbert series prescribed.
Começamos definindo as álgebras Qn, que originaram o estudo das álgebras associadas a grafos orientados em níveis. Em seguida, definimos conceitos importantes, tais como séries de Hilbert , álgebras graduadas e álgebras filtradas. Entre as álgebras quadráticas, introduzimos as álgebras de Koszul. As séries de Hilbert são instrumentos úteis para estudar a Koszulidade de álgebras quadráticas. A interpretação homológica dos coeficientes da série de Hilbert de álgebras associadas a grafos em níveis nos permite dar condições de Koszulidade dessas álgebras em termos das propriedades homológicas do grafo. Usamos essa interpretação para construir álgebras com séries de Hilbert préestabelecidas.
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Bitseki, Penda Siméon Valère. "Inégalités de déviations, principe de déviations modérées et théorèmes limites pour des processus indexés par un arbre binaire et pour des modèles markoviens". Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2012. http://tel.archives-ouvertes.fr/tel-00822136.
Testo completoAbstract (sommario):
Le contrôle explicite de la convergence des sommes convenablement normalisées de variables aléatoires, ainsi que l'étude du principe de déviations modérées associé à ces sommes constituent les thèmes centraux de cette thèse. Nous étudions principalement deux types de processus. Premièrement, nous nous intéressons aux processus indexés par un arbre binaire, aléatoire ou non. Ces processus ont été introduits dans la littérature afin d'étudier le mécanisme de la division cellulaire. Au chapitre 2, nous étudions les chaînes de Markov bifurcantes. Ces chaînes peuvent être vues comme une adaptation des chaînes de Markov "usuelles'' dans le cas où l'ensemble des indices à une structure binaire. Sous des hypothèses d'ergodicité géométrique uniforme et non-uniforme d'une chaîne de Markov induite, nous fournissons des inégalités de déviations et un principe de déviations modérées pour les chaînes de Markov bifurcantes. Au chapitre 3, nous nous intéressons aux processus bifurcants autorégressifs d'ordre p (). Ces processus sont une adaptation des processus autorégressifs linéaires d'ordre p dans le cas où l'ensemble des indices à une structure binaire. Nous donnons des inégalités de déviations, ainsi qu'un principe de déviations modérées pour les estimateurs des moindres carrés des paramètres "d'autorégression'' de ce modèle. Au chapitre 4, nous traitons des inégalités de déviations pour des chaînes de Markov bifurcantes sur un arbre de Galton-Watson. Ces chaînes sont une généralisation de la notion de chaînes de Markov bifurcantes au cas où l'ensemble des indices est un arbre de Galton-Watson binaire. Elles permettent dans le cas de la division cellulaire de prendre en compte la mort des cellules. Les hypothèses principales que nous faisons dans ce chapitre sont : l'ergodicité géométrique uniforme d'une chaîne de Markov induite et la non-extinction du processus de Galton-Watson associé. Au chapitre 5, nous nous intéressons aux modèles autorégressifs linéaires d'ordre 1 ayant des résidus corrélés. Plus particulièrement, nous nous concentrons sur la statistique de Durbin-Watson. La statistique de Durbin-Watson est à la base des tests de Durbin-Watson, qui permettent de détecter l'autocorrélation résiduelle dans des modèles autorégressifs d'ordre 1. Nous fournissons un principe de déviations modérées pour cette statistique. Les preuves du principe de déviations modérées des chapitres 2, 3 et 4 reposent essentiellement sur le principe de déviations modérées des martingales. Les inégalités de déviations sont établies principalement grâce à l'inégalité d'Azuma-Bennet-Hoeffding et l'utilisation de la structure binaire des processus. Le chapitre 5 est né de l'importance qu'a l'ergodicité explicite des chaînes de Markov au chapitre 3. L'ergodicité géométrique explicite des processus de Markov à temps discret et continu ayant été très bien étudiée dans la littérature, nous nous sommes penchés sur l'ergodicité sous-exponentielle des processus de Markov à temps continu. Nous fournissons alors des taux explicites pour la convergence sous exponentielle d'un processus de Markov à temps continu vers sa mesure de probabilité d'équilibre. Les hypothèses principales que nous utilisons sont : l'existence d'une fonction de Lyapunov et d'une condition de minoration. Les preuves reposent en grande partie sur la construction du couplage et le contrôle explicite de la queue du temps de couplage.
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Bouvier, Damien. "Identification de systèmes non linéaires représentés en séries de Volterra : applications aux systèmes sonores". Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS162/document.
Testo completoAbstract (sommario):
Cette thèse porte sur l’identification de systèmes non linéaires représentables en séries de Volterra, et son application à des systèmes sonores. Les séries de Volterra, qui permettent de représenter une large classe de systèmes non linéaires, correspondent à un développement en série organisé par ordre d'homogénéité par rapport à l’entrée: chaque terme homogène est caractérisé par un noyau convolutif dont l’ensemble fournit une "signature complète" du système représenté. Les travaux présentés reposent sur le développement d’une étape préalable de séparation des termes de la série pour améliorer l’identification des noyaux de Volterra. Par rapport aux méthodes déjà existantes de séparation en ordres homogènes, basées sur des relations d’amplitudes entre signaux tests, l'approche adoptée dans cette thèse consiste à exploiter les relations de phase entre signaux afin d'obtenir une méthode robuste. Cela est tout d’abord obtenu de manière abstraite pour le cas de signaux d’excitations complexes. De cette idée, plusieurs méthodes adaptées au cas des signaux réels sont développées. Ceci amène à définir de nouvelles catégories de signaux pour décrire la sortie d’une série de Volterra, regroupant les contributions selon leurs propriétés de phase. Les méthodes de séparation proposées sont testées et appliquées à une pédale d’effet de guitare. Ensuite, des méthodes d’identification spécifiques aux nouveaux types de signaux sont présentées. Enfin, une méthode d’estimation des paramètres d’une représentation d’état à non-linéarités polynomiales est développée. Celle-ci est appliquée à un haut-parleur électrodynamique, dont les caractéristiques non linéaires sont étudiéesThis thesis addresses the identification of nonlinear systems that can be represented with Volterra series, and its application to audio systems. Volterra series give an input-output representation, approximated to within a given error, of any time-invariant continuous nonlinear system with fading memory. Technically, they correspond to a series expansion sorted by homogeneity order with respect to the input: each homogeneous term is characterized by a convolutive kernel whose set provides a "complete signature" of the modelled system. The works presented are based on the development of a preliminary step that consists in separating the series' terms to improve Volterra kernels' identification. Compared to existing homogeneous order separation methods, which are based on amplitude relationships between test signals, the approach chosen in this thesis is to exploit phase relationships between signals to obtain a robust method. This is first obtained in the theoretical case of complex excitation signals. From this idea, several methods suited to the use of real signals are developed. This leads to define new signals categories that describes the output of a Volterra series, sorting nonlinear contributions according to their phase properties. The proposed separation methods are applied and tested on a guitar pedal effect. Then, specific identification methods for the new types of signals are presented Finally, a method for estimating the parameters of a polynomial nonlinear state-space representation is developed. This is applied to an electrodynamic loudspeaker whose nonlinear characteristics are studied
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Rincon, Guillermo. "Kinetics of the electrocoagulation of oil and grease". ScholarWorks@UNO, 2011. http://scholarworks.uno.edu/td/131.
Testo completoAbstract (sommario):
Research on the electrocoagulation (EC) of hexane extractable materials (HEM) has been conducted at the University of New Orleans using a proprietary bench-scale EC reactor. The original reactor configuration forced the fluid to follow a vertical upward-downward path. An alternate electrode arrangement was introduced so that the path of flow became horizontal. Both configurations were evaluated by comparing the residence time distribution (RTD) data generated in each case. These data produced indication of internal recirculation and stagnant water when the fluid followed a vertical path. These anomalies were attenuated when the fluid flowed horizontally and at a velocity higher than 0.032 m s-1 . A series of EC experiments were performed using a synthetic emulsion with a HEM concentration of approximately 700 mg l-1. It was confirmed that EC of HEM follows first-order kinetics, and kinetic constants of 0.0441 s-1 and 0.0443 s-1 were obtained from applying both the dispersion and tanks-in-series (TIS) models, respectively. In both cases R2 was 0.97. Also, the TIS model indicated that each cell of the EC behaves as an independent continuous-stirred-tank reactor.
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Hudec, Jiří. "Studie optimalizace řízení zásob". Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2007. http://www.nusl.cz/ntk/nusl-221448.
Testo completoAbstract (sommario):
This master´s thesis deals with problems of inventory control optimalization in a business company. It contains theory data, company analyses and its market position, an analysis of information systems and inventory control in use, its evaluation and own recommendation leading to the optimalization.
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Monnet-Cantagrel, Hélène. "Les Séries télévisées du format aux franchises. Pratique et esthétique des dramas américains de prime-time, créés entre 1996 et 2006". Thesis, Sorbonne Paris Cité, 2015. http://www.theses.fr/2015USPCA173.
Testo completoAbstract (sommario):
Les séries télévisées de fiction suscitent depuis quelques années un intérêt sans précédent dans leur histoire, qui amène à s’interroger sur le sens pris par cette forme de fiction. Mais, à cette question de la signification de l’objet, s’ajoute celle de la méthode permettant d’y répondre. Récits, fictions, les séries sont aussi des produits commerciaux et industriels et, de ce fait, fortement déterminées par leurs contextes de production et de réception.Depuis 1996 et la dérégulation des télécommunications aux Etats-Unis, le paysage médiatique et le marché télévisuel, américains puis internationaux, ont connu d’importants bouleversements économiques et technologiques dont une des conséquences a été l’adoption de stratégies d’expansion et de branding des programmes, qui prennent un tour inédit et auxquelles les séries n’échappent pas.Adaptées, dérivées, reprises, les séries, notamment dramatiques, se franchisent, faisant apparaître alors ce qui constitue une spécificité de la création sérielle, le format. Forme minimale de la fiction, le format consiste en une présentation écrite qui en fixe les constituants fondamentaux permettant non seulement sa sérialisation mais aussi sa distribution.A partir de formats et de franchises de séries dramatiques américaines de la décennie initiée à 1996, cette thèse se propose d’examiner en quoi le format pourrait contribuer à enrichir l’étude des séries télévisées dans une perspective autant théorique qu’interprétativeSince the beginning of the 2000s, television series arouse an unheard-of interest in their history, which brings to question the sense of this kind of fiction. But, in this issue of the meaning of the object, is also the one of the method to answer it.Narratives and fictions, series are also commercial and industrial products and, therefore, strongly determined by their contexts of production and reception. Since 1996 and the deregulation of telecommunications in the United States, american then international media landscapes and markets have known important economic and technological upheavals which led to new strategies of expansion and branding of the programs, in an unprecedented tourAdapted, spun off, remade, dramatic series lead to franchises, revealing then what establishes a specificity of the serial creation : the format. The television format is a written presentation which sets the fundamental core of the fiction, allowing not only serialization but also its distribution.Studying formats and franchises of American dramatic series of the decade introduced in 1996, this thesis examines how the television format could contribute to enrich the study of television series in a theoretical as well as in an interpretative objective