936 resultados para Stereo vision, mutual information


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El capítulo 1 de esta tesis doctoral describe conceptos relativos a la ontología y a la arquitectura como, por ejemplo, la cuestión de “El lugar” o “Basho” o el espacio visto desde un punto de vista filosófico. En este capítulo se examinan las diferencias y similitudes entre la ideología oriental y la filosofía de occidente a lo largo de la historia y se esbozan los puntos comunes entre ambas en cuestiones que atañen al habitar. En el capítulo 2, estos conceptos se enumeran y ordenan y se extraen diferentes conclusiones en cuanto a la percepción de valores como el espacio o el vacío, fundamentales para entender la arquitectura y el paisaje en las culturas de Oriente y Occidente. El capítulo 3 describe el paisaje oriental y el jardín chino a modo de prólogo del de Japón. Este capítulo introduce al lector en la historia del jardín y explica las transformaciones que éste ha sufrido a lo largo de la historia de China. El capítulo 4 es una asimilación de los conceptos examinados en los capítulos 1,2 y 3 y en él se analizan los aspectos compositivos fundamentales del jardín chino y sus elementos como, por ejemplo, el centro, el límite, el agua o la montaña. El capítulo 5 consiste en una introducción al paisaje japonés que comienza con el estudio de su geografía, su lengua, su literatura y sus períodos históricos más importantes previos a la era moderna: la era primitiva “Jomon”, la era “Yayoi”, los tres Shogunatos y la Revolución Meiji. La segunda parte del capítulo 5 describe los jardines japoneses a lo largo de la historia tales como el jardín Karesansui, los jardines de Kioto o el arte del jardín Tatebana, entre otros. El capítulo 6 comienza con una copia del texto medieval japonés, “HOJOKI”. Al igual que en los capítulos 2 y 4, en el capítulo 6 se extraen los valores del capítulo anterior, esta vez, mediante un comentario de texto. En esencia, este libro demuestra la importancia de la “cabaña en la naturaleza” para la cultura japonesa, así como la relación del espacio doméstico y el jardín a lo largo de su historia. El capítulo 7 describe la evolución del paisaje de la ciudad china en paralelo a la evolución del paisaje urbano japonés que se desarrolla en el capítulo 9. El capítulo 8 es un nexo de unión entre los capítulos 7 y 9 puesto que explica las influencias paisajísticas y urbanas mutuas entre las culturas china y japonesa a lo largo de la historia como es el caso del trazado de las antiguas ciudades capitales chinas y japonesas o el de los paisajes y urbes proyectados sobre la topografía de Manchuria durante la ocupación japonesa de China. El capítulo 9 describe el paisaje japonés moderno, sus ciudades y sus paisajes interurbanos como, por ejemplo, el Tokai-do. A continuación describe la evolución de la arquitectura y el jardín japonés a lo largo del siglo XX, los principales movimientos de vanguardia, las circunstancias económicas que llevaron al país a la crisis de los 90 y la lenta recuperación económica posterior. Por último, este capítulo explica la destrucción del paisaje del norte tras El Gran Terremoto del Este del 2011 y su recuperación a corto plazo. El capítulo 10 se compone de tres entrevistas a tres figuras relevantes del mundo académico y de la arquitectura japonesa. Algunos de los temas que exponen son la arquitectura doméstica japonesa, el jardín y la naturaleza de esta cultura, la situación de la ciudad de Tokio o el rol del arquitecto en la sociedad contemporánea, entre otros. Además de estas cuestiones, se debate acerca de los recursos y la recuperación del país tras El Gran Terremoto del Este de Japón. Finalmente, el capítulo 11 consiste en un estudio en profundidad acerca del paisaje de la ciudad de Tokio y el espacio doméstico y el jardín en base a los conceptos estudiados en los capítulos 1 y 2 y en relación a los valores paisajísticos vistos en los capítulos 3,4,5 y 6, además de los temas urbanos y topográficos estudiados en los capítulos 7,8,9 y 10. En este capítulo se estudia la figura del sujeto individual y colectivo, el refugio, el jardín, las acciones urbanas del Machizukuri, el parque y la morfología y evolución de los barrios centrales de Tokio y sus espacios domésticos y parques y jardines vistos a través de los datos estadísticos proporcionados por el gobierno. Además, el texto estudia un total de 21 casos seleccionados y analizados a través de la comparación de cerca de 800 viviendas domésticas publicadas entre 1991 y 2011 en las revistas de gran prestigio nacional e internacional, Shinkenchiku Jutakutokushu y GA Houses. Tras el análisis de los casos de estudio, se extraen una serie de conclusiones y clasificaciones del jardín en el espacio doméstico del centro de Tokio en dicho periodo. Los últimos tres capítulos de la tesis doctoral se dividen en: una traducción al inglés del resumen y las conclusiones más importantes del capítulo 11 (capítulo 12) una conclusión y resumen homólogos en japonés (capítulo 13) y un cuaderno de dibujos a mano realizado por la autora sobre especies botánicas naturalizadas domésticas de la ciudad de Tokio (capítulo 14) ABSTRACT Chapter 1 of this Ph.D. thesis describes concepts related to ontology and architecture like the issue of “The place” in Japan, or “The space” as seen from a philosophic point of view. In this chapter, the differences between the essential ancient Asian ideology and the philosophical contemporary thought of the East are discussed, and at the same time the transcendental thought coming from the West is analysed and compared to both of them. In Chapter 2 these concepts are analysed specifically in the field of “inhabiting the domestic space” and the text fathoms the common points between Eastern and Western thought relating to the house and the garden. Chapter 3 describes the oriental landscape and garden of China as a prologue to that of Japan. This chapter starts with a brief description of the history of the garden in the East and the West and introduces the reader into the geography and changes that have taken place in China since the birth of its culture. Chapter 4 entails a brief assimilation of what has been deduced from chapters 1, 2 and 3. In this chapter the compositive and design aspects of the Chinese garden are described, aspects such as centre, limit, the element of the mountain, emptiness, water, and vision or the theatre. Chapter 5 is an introduction to the history of landscape and architecture in Japan that starts with a geographical insight into the country and with a short summary about the language, the primitive “Jomon” culture, the “Yayoi” era , the three Shogunates.and the Meiji Revolution. In the second part of chapter 5, the text describes Japanese gardens throughout history, for example the Karesansui garden, the history of Kyoto and its gardens, the garden in relationship with art and with Japanese literature or the art of Tatebana. Chapter 6 starts with a copy of the medieval text “HOJOKI” and discusses issues such as the meaning of “the hut in the nature” for Japanese culture and its relationship with the domestic space and the garden. Chapter 7 discusses the development of cities in the landscape in Chinese culture in parallel with an observation of the evolution of cities in Japanese culture and landscape. Chapter 8 is the crux of the Ph.D. research as it explains the mutual influences of landscape, urban planning, construction and architecture between Japan in China. Chapter 9 describes the Japanese urban planning since the very first urban developments and develops a study on the evolution of the Japanese cities and roads (like the Tokai-do) in the landscape. Also, it describes the reconstruction of the cities of Japan after the Second World War, the cultural vanguard movements, the economical circumstances that led to the Japan´ s economic crisis of the 90´s and the slow recovery of its economy. Also, at the end of this chapter, the text analyses the event of the Great East Japan Earthquake of 211. Chapter 10 of this Ph.D. research is composed of a number of interviews with architects and professors about architecture, nature in the domestic space, the role of the architect nowadays in addition to facts about energy and about the Great East Japan Earthquake . Finally, chapter 11 consists of a deep study concerning the current situation in the city of Tokyo and the relationship between its domestic spaces (dwellings) and gardens based on the philosophical values studied in chapters 1 and 2, aswell as the landscape values of the garden studied in chapters 3,4,5, and 6 plus the information about the cities in the landscape studied in chapters 7,8, 9 and 10. In this chapter the main goal is to study the human being, the refuge, the garden, the urban planning actions of Machizukuri, the park and the morphology and evolution of the central quarters of Tokyo and of its domestic spaces and parks seen through the statistical data provided by the Japanese government in the last decades. Also, the text provides a study on 21 cases selected and analysed through the comparison of around 800 domestic spaces designed in between 1991 and 2011 and published in “Shinkenchiku Jutakutokushu” and “GA Houses” magazines. After these study cases, a number of conclusions are developed and also a classification of the domestic garden in the center of Tokyo. The last three chapters of this Ph.D. work are divided in: the translation to English of the summary and main conclusions of chapter 11 of the research in Chapter 12, the translation to Japanese of the summary and main conclusions of chapter 11 of the research in Chapter 13, and a collection of hand-drawings done by the author about the botanical species found in the gardens of the domestic realms of Tokyo in Chapter 14.

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Deciphering the information that eyes, ears, and other sensory organs transmit to the brain is important for understanding the neural basis of behavior. Recordings from single sensory nerve cells have yielded useful insights, but single neurons generally do not mediate behavior; networks of neurons do. Monitoring the activity of all cells in a neural network of a behaving animal, however, is not yet possible. Taking an alternative approach, we used a realistic cell-based model to compute the ensemble of neural activity generated by one sensory organ, the lateral eye of the horseshoe crab, Limulus polyphemus. We studied how the neural network of this eye encodes natural scenes by presenting to the model movies recorded with a video camera mounted above the eye of an animal that was exploring its underwater habitat. Model predictions were confirmed by simultaneously recording responses from single optic nerve fibers of the same animal. We report here that the eye transmits to the brain robust “neural images” of objects having the size, contrast, and motion of potential mates. The neural code for such objects is not found in ambiguous messages of individual optic nerve fibers but rather in patterns of coherent activity that extend over small ensembles of nerve fibers and are bound together by stimulus motion. Integrative properties of neurons in the first synaptic layer of the brain appear well suited to detecting the patterns of coherent activity. Neural coding by this relatively simple eye helps explain how horseshoe crabs find mates and may lead to a better understanding of how more complex sensory organs process information.

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Although neuronal synchronization has been shown to exist in primary motor cortex (MI), very little is known about its possible contribution to coding of movement. By using cross-correlation techniques from multi-neuron recordings in MI, we observed that activity of neurons commonly synchronized around the time of movement initiation. For some cell pairs, synchrony varied with direction in a manner not readily predicted by the firing of either neuron. Information theoretic analysis demonstrated quantitatively that synchrony provides information about movement direction beyond that expected by simple rate changes. Thus, MI neurons are not simply independent encoders of movement parameters but rather engage in mutual interactions that could potentially provide an additional coding dimension in cortex.

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Blindsight is the rare and paradoxical ability of some human subjects with occipital lobe brain damage to discriminate unseen stimuli in their clinically blind field defects when forced-choice procedures are used, implying that lesions of striate cortex produce a sharp dissociation between visual performance and visual awareness. Skeptics have argued that this is no different from the behavior of normal subjects at the lower limits of conscious vision, at which such dissociations could arise trivially by using different response criteria during clinical and forced-choice tests. We tested this claim explicitly by measuring the sensitivity of a hemianopic patient independently of his response criterion in yes-no and forced-choice detection tasks with the same stimulus and found that, unlike normal controls, his sensitivity was significantly higher during the forced-choice task. Thus, the dissociation by which blindsight is defined is not simply due to a difference in the patients’ response bias between the two paradigms. This result implies that blindsight is unlike normal, near-threshold vision and that information about the stimulus is processed in blindsighted patients in an unusual way.

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The dichotomy between two groups of workers on neuroelectrical activity is retarding progress. To study the interrelations between neuronal unit spike activity and compound field potentials of cell populations is both unfashionable and technically challenging. Neither of the mutual disparagements is justified: that spikes are to higher functions as the alphabet is to Shakespeare and that slow field potentials are irrelevant epiphenomena. Spikes are not the basis of the neural code but of multiple codes that coexist with nonspike codes. Field potentials are mainly information-rich signs of underlying processes, but sometimes they are also signals for neighboring cells, that is, they exert influence. This paper concerns opportunities for new research with many channels of wide-band (spike and slow wave) recording. A wealth of structure in time and three-dimensional space is different at each scale—micro-, meso-, and macroactivity. The depth of our ignorance is emphasized to underline the opportunities for uncovering new principles. We cannot currently estimate the relative importance of spikes and synaptic communication vs. extrasynaptic graded signals. In spite of a preponderance of literature on the former, we must consider the latter as probably important. We are in a primitive stage of looking at the time series of wide-band voltages in the compound, local field, potentials and of choosing descriptors that discriminate appropriately among brain loci, states (functions), stages (ontogeny, senescence), and taxa (evolution). This is not surprising, since the brains in higher species are surely the most complex systems known. They must be the greatest reservoir of new discoveries in nature. The complexity should not deter us, but a dose of humility can stimulate the flow of imaginative juices.

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Visual information is increasingly being used in a great number of applications in order to perform the guidance of joint structures. This paper proposes an image-based controller which allows the joint structure guidance when its number of degrees of freedom is greater than the required for the developed task. In this case, the controller solves the redundancy combining two different tasks: the primary task allows the correct guidance using image information, and the secondary task determines the most adequate joint structure posture solving the possible joint redundancy regarding the performed task in the image space. The method proposed to guide the joint structure also employs a smoothing Kalman filter not only to determine the moment when abrupt changes occur in the tracked trajectory, but also to estimate and compensate these changes using the proposed filter. Furthermore, a direct visual control approach is proposed which integrates the visual information provided by this smoothing Kalman filter. This last aspect permits the correct tracking when noisy measurements are obtained. All the contributions are integrated in an application which requires the tracking of the faces of Asperger children.

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La recherche d'informations s'intéresse, entre autres, à répondre à des questions comme: est-ce qu'un document est pertinent à une requête ? Est-ce que deux requêtes ou deux documents sont similaires ? Comment la similarité entre deux requêtes ou documents peut être utilisée pour améliorer l'estimation de la pertinence ? Pour donner réponse à ces questions, il est nécessaire d'associer chaque document et requête à des représentations interprétables par ordinateur. Une fois ces représentations estimées, la similarité peut correspondre, par exemple, à une distance ou une divergence qui opère dans l'espace de représentation. On admet généralement que la qualité d'une représentation a un impact direct sur l'erreur d'estimation par rapport à la vraie pertinence, jugée par un humain. Estimer de bonnes représentations des documents et des requêtes a longtemps été un problème central de la recherche d'informations. Le but de cette thèse est de proposer des nouvelles méthodes pour estimer les représentations des documents et des requêtes, la relation de pertinence entre eux et ainsi modestement avancer l'état de l'art du domaine. Nous présentons quatre articles publiés dans des conférences internationales et un article publié dans un forum d'évaluation. Les deux premiers articles concernent des méthodes qui créent l'espace de représentation selon une connaissance à priori sur les caractéristiques qui sont importantes pour la tâche à accomplir. Ceux-ci nous amènent à présenter un nouveau modèle de recherche d'informations qui diffère des modèles existants sur le plan théorique et de l'efficacité expérimentale. Les deux derniers articles marquent un changement fondamental dans l'approche de construction des représentations. Ils bénéficient notamment de l'intérêt de recherche dont les techniques d'apprentissage profond par réseaux de neurones, ou deep learning, ont fait récemment l'objet. Ces modèles d'apprentissage élicitent automatiquement les caractéristiques importantes pour la tâche demandée à partir d'une quantité importante de données. Nous nous intéressons à la modélisation des relations sémantiques entre documents et requêtes ainsi qu'entre deux ou plusieurs requêtes. Ces derniers articles marquent les premières applications de l'apprentissage de représentations par réseaux de neurones à la recherche d'informations. Les modèles proposés ont aussi produit une performance améliorée sur des collections de test standard. Nos travaux nous mènent à la conclusion générale suivante: la performance en recherche d'informations pourrait drastiquement être améliorée en se basant sur les approches d'apprentissage de représentations.

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Mutual recognition is a remarkable innovation facilitating economic intercourse across borders. In the EU's internal goods market it has been helpful in tackling or avoiding the remaining obstacles, namely, regulatory barriers between Member States. However, there is a curious paradox. Despite the almost universal acclaim of the great merits of mutual recognition the principle has, in and by itself, contributed only modestly to the actual realisation of free movement in the single market. It is also surprising that economists have not or hardly underpinned their widespread appreciation for the principle by providing rigorous analysis which could substantiate the case for mutual recognition for policy makers. Business in Europe has shown a sense of disenc hantment with the principle because of the many costs and uncertainties in its application in actual practice. The purpose of the present paper is to provide the economic and strategic arguments for employing mutual recognition much more systematically in the single market for goods and services. The strategic and the "welfare" gains are analysed and adetailed exposition of the fairly high information , transaction and compliance costs is provided. The information costs derive from the fact that mutual recognition remains a distant abstraction for day-to-day business life. Understandably, verifying the "equivalence" of objectives of health and safety between Member States is perceived as difficult and uncertain. This sentiment is exacerbated by the complications of interpreting the equivalence of "effects". In actual practice, these abstractions are expected to override clear and specific national product or services rules, which local inspectors or traders may find problematic without guidance. The paper enumerates several other costs including, inter alia, the absence of sectoral rule books and the next-to-prohibitive costs of monitoring of the application of the principle. The basic problems in applying mutual recognition in the entire array of services are inspected, showing why the principle can only be used in a limited number of services markets and even there it may contribute only modestly to genuine free movement and competitive exposure. A special section is devoted to a range of practical illustrations of the difficulties business experiences when relying on mutual recognition. Finally, the corollary of mutual recognition - regulatory competition - is discussed in terms of a cost/benefits analysis compared to what is often said to be the alternative , that is "harmonisation" , in EU parlance the "new approach" to approximation. The conclusion is that the manifold benefits of mutual recognition for Europe are too great to allow the present ambiguities to continue. The Union needs much more pro-active approaches to reduce the costs of mutual recognition as well as permanent monitoring structures for its application to services (analogous to those already successfully functioning in goods markets). Above all, what is required is a "mutual recognition culture" so that the EU can better enjoy the fruits of its own regulatory ingenuity.

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Capital Markets Union (CMU) is a welcome initiative. It could augment economic risk sharing, set the right conditions for more dynamic development of risk capital for high-growth firms and improve choices and returns for savers. This offers major potential for benefits in terms of jobs, growth and financial resilience. • CMU cannot be a short-term cyclical instrument to replace subdued bank lending, because financial ecosystems change slowly. Shifting financial intermediation towards capital markets and increasing cross-border integration will require action on multiple fronts, including increasing the transparency, reliability and comparability of information and addressing financial stability concerns. Some quick wins might be available but CMU’s real potential can only be achieved with a long-term structural policy agenda. • To sustain the current momentum, the EU should first commit to a limited number of key reforms, including more integrated accounting enforcement and supervision of audit firms. Second, it should set up autonomous taskforces to prepare proposals on the more complex issues: corporate credit information, financial infrastructure, insolvency, financial investment taxation and the retrospective review of recent capital markets regulation. The aim should be substantial legislative implementation by the end of the current EU parliamentary term.

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La recherche d'informations s'intéresse, entre autres, à répondre à des questions comme: est-ce qu'un document est pertinent à une requête ? Est-ce que deux requêtes ou deux documents sont similaires ? Comment la similarité entre deux requêtes ou documents peut être utilisée pour améliorer l'estimation de la pertinence ? Pour donner réponse à ces questions, il est nécessaire d'associer chaque document et requête à des représentations interprétables par ordinateur. Une fois ces représentations estimées, la similarité peut correspondre, par exemple, à une distance ou une divergence qui opère dans l'espace de représentation. On admet généralement que la qualité d'une représentation a un impact direct sur l'erreur d'estimation par rapport à la vraie pertinence, jugée par un humain. Estimer de bonnes représentations des documents et des requêtes a longtemps été un problème central de la recherche d'informations. Le but de cette thèse est de proposer des nouvelles méthodes pour estimer les représentations des documents et des requêtes, la relation de pertinence entre eux et ainsi modestement avancer l'état de l'art du domaine. Nous présentons quatre articles publiés dans des conférences internationales et un article publié dans un forum d'évaluation. Les deux premiers articles concernent des méthodes qui créent l'espace de représentation selon une connaissance à priori sur les caractéristiques qui sont importantes pour la tâche à accomplir. Ceux-ci nous amènent à présenter un nouveau modèle de recherche d'informations qui diffère des modèles existants sur le plan théorique et de l'efficacité expérimentale. Les deux derniers articles marquent un changement fondamental dans l'approche de construction des représentations. Ils bénéficient notamment de l'intérêt de recherche dont les techniques d'apprentissage profond par réseaux de neurones, ou deep learning, ont fait récemment l'objet. Ces modèles d'apprentissage élicitent automatiquement les caractéristiques importantes pour la tâche demandée à partir d'une quantité importante de données. Nous nous intéressons à la modélisation des relations sémantiques entre documents et requêtes ainsi qu'entre deux ou plusieurs requêtes. Ces derniers articles marquent les premières applications de l'apprentissage de représentations par réseaux de neurones à la recherche d'informations. Les modèles proposés ont aussi produit une performance améliorée sur des collections de test standard. Nos travaux nous mènent à la conclusion générale suivante: la performance en recherche d'informations pourrait drastiquement être améliorée en se basant sur les approches d'apprentissage de représentations.

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Contract US AEC AT(11-1)1469.

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"NSF 07-28" --p. 4 of cover.

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Thesis (Ph.D.)--University of Washington, 2016-06

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Social isolation is a predictor of morbidity and mortality in older people. Speech pathologists often consider that communication disabilities associated with normal ageing (sensory loss, language and discourse changes) contribute to social isolation. The aims of this study were to describe the functioning of older people using the International Classification of Functioning, Disability and Health (WHO, 2001) as a conceptual framework for language and sensory functioning, communicative activity, and social participation, and to explore the relationship between communication (both at an impairment level and an activity level), social participation and personal factors (demographics and emotional health). In a prospective study, 47 women and 28 men aged 62 to 98 years (mean=74 yrs) completed objective and subjective assessments of functioning and participation, and provided personal information. Assessments were individually conducted in a face- to-face interview situation with the primary researcher, who was a speech pathologist. Assessments revealed the sample had predominantly mild hearing and vision impairments, unimpaired naming ability, frequent involvement in a wide range of communication activities, and variable social network size and social activities participation. Social participation was shown to be associated with vision, communication activities, age, education and emotional health. Naming and hearing impairments were not reliable predictors of social participation. It was concluded that professionals interested in maintaining and improving social participation of older people could well consider these predictors in community-directed interventions. Speech pathologists should therefore promote older people's involvement in everyday communicative activities while also limiting the impact of communication-related impairments, so that social participation is maintained in our ageing population.