Dissertationen zum Thema „Structured patterns“
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1
Bergeron, Mathieu. „Structured polyphonic patterns“. Thesis, City University London, 2010. http://openaccess.city.ac.uk/12097/.
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The present dissertation develops, applies and evaluates a novel method for the representation and retrieval of patterns in musical data. The method supports the typical polyphonic patterns that one finds in music theory textbooks. Most current computational methods to musical patterns are restricted to monophony (one melody at a time). The Structured Polyphonic Patterns method (SPP) applies to the general case of polyphonic music, where many melodies may unfold concurrently. Pattern components are conjunctions of features which encode properties of musical events, or relations that they form with other events. Relations between events that overlap in time but are not simultaneous are supported, enabling patterns to express key temporal relations of polyphonic music. Patterns are formed by joining and layering pattern components into sequences (horizontal structures) and layers (vertical structures). A layer specifies voicing in an abstract way, and the exploration of different voice permutations is handled automatically. The SPP method also provides a mechanism for defining new features. We evaluate SPP by developing a small catalog of musicologically relevant queries and analyzing the results on four corpora: 185 chorale harmonizations by J.S. Bach, Mozart Symphony no. 40, a small set of piano pieces by Chopin, and a collection of folk songs containing more than 8000 pieces – in addition to its size, demonstrating the scalability of the method, that latter corpus is interesting as it shows that SPP is also usable for monophony. Examining several corpora allows us to establish that some polyphonic patterns constitute salient properties of a corpus: they are over-represented in one corpus by comparison to the others. In addition, the queries we develop demonstrate that the SPP method possesses sufficient expressiveness to capture important music-theoretic notions. At the same time, we show how the method is more restrictive than some existing polyphonic pattern representations, hence providing a better approximation of the expressive power required for polyphonic patterns. It is a better candidate representation for music data mining, a difficult problem that has received significant attention for the monophonic case, but limited attention for the more general polyphonic case.
2
Desjardins, Danick. „Structured lighting stereoscopy with marching pseudo-random patterns“. Thesis, University of Ottawa (Canada), 2008. http://hdl.handle.net/10393/27760.
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This thesis discusses the development of a 3D reconstruction system based on active stereoscopy with structured lighting. The proposed system accomplishes 3D reconstruction of objects using a combination of spatial-neighboring and time-multiplexing structured light patterns encoded with pseudo-random codes. This combination builds upon the concept of marching patterns that can adaptively increase the reconstruction resolution on demand. Original techniques are introduced to recover and validate pseudo-random codes from images using a combination of image processing algorithms. The validation of codes is performed such that potential outliers are minimized and the density of 3D point clouds remains fairly high in the models. Finally, the system simultaneously provides models with color and texture mapping using linear interpolation between vertices which enables a more accurate and intuitive representation of 3D objects. Experimental results presented demonstrate the various reconstruction densities possible with the proposed approach, its performance on objects with different surface properties, and the quality of the colored 3D models achieved.
3
Wang, Chao. „Exploiting non-redundant local patterns and probabilistic models for analyzing structured and semi-structured data“. Columbus, Ohio : Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1199284713.
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4
Robertson, Suzanne Lora. „Spatial Patterns in Stage-Structured Populations with Density Dependent Dispersal“. Diss., The University of Arizona, 2009. http://hdl.handle.net/10150/194472.
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Spatial segregation among life cycle stages has been observed in many stage-structured species, including species of the flour beetle Tribolium. Patterns have been observed both in homogeneous and heterogeneous environments. We investigate density dependent dispersal of life cycle stages as a mechanism responsible for this separation. By means of mathematical analysis and numerical simulations, we explore this hypothesis using stage-structured, integrodifference equation (IDE) models that incorporate density dependent dispersal kernels.In Chapter 2 we develop a bifurcation theory approach to the existence and stability of (non-extinction) equilibria for a general class of structured integrodifference equation models on finite spatial domains with density dependent kernels. We show that a continuum of such equilibria bifurcates from the extinction equilibrium when it loses stability as the net reproductive number n increases through 1. We give several examples to illustrate the theory.In Chapter 3 we investigate mechanisms that can lead to spatial patterns in two dimensional Juvenile-Adult IDE models. The bifurcation theory shows that such patterns do not arise for n near 1. For larger values of n we show, via numerical simulation, that density dependent dispersal can lead to the segregation of life cycle stages in the sense that each stage peaks in a different spatial location.Finally, in Chapter 4, we construct spatial models to describe the population dynamics of T. castaneum, T. confusum and T. brevicornis and use them to assess density dependent dispersal mechanisms that are able to explain spatial patterns that have been observed in these species.
5
Schröder, Arne. „Alternative Stable States in Size-Structured Communities : Patterns, Processes, and Mechanisms“. Doctoral thesis, Umeå University, Ecology and Environmental Science, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-1628.
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Alternative stable states have been, based on theoretical findings, predicted to be common in ecological systems. Empirical data from a number of laboratory and natural studies strongly suggest that alternative stable states also occur in real populations, communities and ecosystems. Potential mechanisms involve population size-structure and food-dependent individual development. These features can lead to ontogenetic niche shifts, juvenile recruitment bottlenecks and emergent Allee effects; phenomena that establish destabilising positive feedbacks in a system and hence create alternative stable states.
I studied the consequences of population size-structure for community dynamics at different scales of system complexity. I performed laboratory and ecosystem experiments. Small poecilliid fishes and planktonic invertebrates with short generation times and life spans were used as model organisms. This allowed me to assess the long-term dynamics of the populations and communities investigated.
The main experimental results are: (a) An ontogenetic niche shift in individuals of the phantom midge Chaoborus made the population vulnerable to an indirect competitive recruitment bottleneck imposed by cladoceran mesozooplankton via rotifers. Consequentially the natural zooplankton food web exhibited two alternative attractors. (b) Body size determined the success of Poecilia reticulata invading resident population of Heterandria formosa and thus the type of alternative stable state that established. Small invaders were outcompeted by the residents, whereas large invaders excluded their competitor by predating on its recruits. (c) External juvenile and adult mortality altered the internal feedback structure that regulates a laboratory population of H. formosa in such a way that juvenile biomass increased with mortality. This biomass overcompensation in a prey population can establish alternative stable states with top-predators being either absent or present.
The major conclusion is that size-structure and individual growth can indeed lead to alternative stable states. The considerations of these ubiquitous features of populations offer hence new insights and deeper understanding of community dynamics. Alternative stable states can have tremendous consequences for human societies that utilise the ecological services provided by an ecological system. Understanding the effects of size-structure on alternative stability is thus crucial for sustainable exploitation or production of food resources.
6
Schröder, Arne. „Alternative stable states in size-structured communities : patterns, processes, and mechanisms /“. Umeå : Department of Ecology and Environmental Science, Umeå Univ, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-1628.
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7
Roumpos, Konstantinos [Verfasser], und Günter [Akademischer Betreuer] Reiter. „Tuning topography and patterns of thin polymer films on structured substrates“. Freiburg : Universität, 2021. http://d-nb.info/1230322248/34.
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8
Kirby, Melissa. „The search for structure : an assessment of the benefits of using structured patterns in human spatial memory“. Thesis, University of Leicester, 2017. http://hdl.handle.net/2381/40443.
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The search for food is directly related to individual fitness, with many cognitive competences thought to be the products of foraging pressures faced by our hominid ancestors. Efficient spatial working memory, which often shows a male advantage, is of particular importance to maximise benefits whilst minimising costs during search. An ability to benefit from spatial structure, which reduces memory load, interestingly shows an inverse relationship with taxonomic distance from humans. Eleven experiments highlighted a propensity to detect and benefit from structure during search, and considered the evolutionary and comparative importance of this high-level cognitive skill. In the first study to disentangle the cognitive and energetic motivations of human search, a preference was found for the reduction of cognitive load by exploiting spatial structure, over the reduction of travelling distance. Further findings suggested that data-reducing strategies exploiting spatial structure may be characteristic of primate cognition. The development of an ecologically valid task based on primate foraging situations, showed a strong tendency in humans to detect and use temporal structure. When adapted for the assessment of older adults and children, older adults were less efficient foragers and showed a deficit in their ability to detect temporal structure, whilst children appeared to show a developmental trend in foraging efficiency. This task afforded a direct comparison between humans and a non-human primate species, which suggested that baboons did not exploit temporal structure during search. The finding that humans show a tendency to promote cognitive over energetic economy, and a strong proficiency to benefit from structure in stimuli, has implications for the evolution of this competency, the role of the dorsolateral prefrontal cortex, and sex differences in spatial memory. These findings have implications for theories which suggest that diet and the requirements of foraging played an important role in the high-level cognition humans possess today.
9
Zhang, Yujia. „A Structured Light Based 3D Reconstruction Using Combined Circular Phase Shifting Patterns“. The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1546488253821736.
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10
Wang, Haiying. „Self-adaptive neural network approaches to dicovering and visualising patterns in semistructured and structured biomedical data“. Thesis, University of Ulster, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399965.
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11
Le, Andrew Phong. „Design patterns for online learning environments: A structured approach for operationalizing and sharing theory-based design knowledge“. Diss., Connect to online resource, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1439424.
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12
Oita, Marilena. „Deriving Semantic Objects from the Structured Web (Inférer des Objects Sémantiques du Web Structuré)“. Phd thesis, Telecom ParisTech, 2012. http://tel.archives-ouvertes.fr/tel-00922459.
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This thesis focuses on the extraction and analysis of Web data objects, investigated from different points of view: temporal, structural, semantic. We first survey different strategies and best practices for deriving temporal aspects of Web pages, together with a more in-depth study on Web feeds for this particular purpose. Next, in the context of dynamically-generated Web pages by content management systems, we present two keyword-based techniques that perform article extraction from such pages. Keywords, either automatically acquired through a Tf−Idf analysis, or extracted from Web feeds, guide the process of object identification, either at the level of a single Web page (SIGFEED algorithm), or across different pages sharing the same template (FOREST algorithm). We finally present, in the context of the deep Web, a generic framework which aims at discovering the semantic model of a Web object (here, data record) by, first, using FOREST for the extraction of objects, and second, by representing the implicit rdf:type similarities between the object attributes and the entity of the Web interface as relationships that, together with the instances extracted from the objects, form a labeled graph. This graph is further aligned to a generic ontology like YAGO for the discovery of the graph's unknown types and relations.
13
Chern, Peter Kyaw Zaw Naing. „Patterns of coal sedimentation in the Ipswich Basin Southeast Queensland“. Thesis, Queensland University of Technology, 2004. https://eprints.qut.edu.au/15924/1/Peter_Chern_Thesis.pdf.
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The intermontane Ipswich Basin, which is situated 30km south-west of Brisbane, contains coal measures formed in the Late Triassic Epoch
following a barren non-depositional period. Coal, tuff, and basalt were deposited along with fluvial dominated sediments. The Ipswich Coal
Measures mark the resumption of deposition in eastern Australia after the coal hiatus associated with a series of intense tectonic activity in Gondwanaland during the Permo-Triassic interval. A transtensional tectonic
movement at the end of the Middle Triassic deformed the Toogalawah Group before extension led to the formation of the Carnian Ipswich Coal
Measures in the east.
The Ipswich Coal Measures comprise the Brassall and Kholo Subgroups. The Blackstone Formation, which forms the upper unit of the Brassall
Subgroup, contains seven major coal seams. The lower unit of the Brassall Subgroup, the Tivoli Formation, consists of sixteen stratigraphically
significant coal seams. The typical thickness of the Blackstone Formation is 240m and the Tivoli Formation is about 500m.
The coal seams of the Ipswich Basin differ considerably from those of other continental Triassic basins. However, the coal geology has previously attracted little academic attention and the remaining exposures of the Ipswich coalfield are rapidly disappearing now that mining has ceased. The primary aim of this project was to study the patterns of coal sedimentation and the response of coal seam characteristics to changing depositional
environments.
The coal accumulated as a peat-mire in an alluvial plain with meandering channel systems. Two types of peat-mire expansion occurred in the basin. Peat-mire aggradation, which is a replacement of water body by the peatmire,
was initiated by tectonic subsidence. This type of peat-mire expansion is known as terrestrialisation. It formed thick but laterally limited coal seams in the basin. Whereas, peat-mire progradation was related to
paludification and produced widespread coal accumulation in the basin.
The coal seams were separated into three main groups based on the mean seam thickness and aerial distribution of one-meter and four-meter thickness contour intervals. Group 1 seams within the one-meter thickness interval are
up to 15,000m2 in area, and seams within the four-meter interval have an aerial extent of up to 10,000m2. Group 1A contains the oldest seam with numerous intraseam clastic bands and shows a very high thickness to area ratio, which indicates high subsidence rates. Group 1B seams have moderately high thickness to area ratios. The lower clastic influx and slower subsidence rates favoured peat-mire aggradation. The Group 1A seam is relatively more widespread in aerial extent than seams from Group 1B. Group 1C seams have low mean thicknesses and small areas, suggesting short-lived peat-mires as a result of high clastic influx. Group 2 seams arebetween 15,000 and 35,000m2 in area within the one-meter interval, and between 5,000 and 10,000m2 within the four-meter interval. They have
moderately high area to thickness ratios, indicating that peat-mire expansion
occurred due to progressively shallower accommodation and a rising groundwater table. Group 3 seams, which have aerial extents from 35,000 to 45,000m2 within the one-meter thickness contour interval and from 10,000
to 25,000m2 within the four-meter interval, show high aerial extent to thickness ratios. They were deposited in quiet depositional environments
that favoured prolonged existence of peat-mires. Group 3 seams are all relatively young whereas most Group 1 seams are relatively old seams.
All the major fault systems, F1, F2 and F3, trend northwest-southeast. Apart from the West Ipswich Fault (F3), the F1 and F2 systems are broad Palaeozoic basement structures and thus they may not have had a direct influence on the formation of the much younger coal measures. However, the sedimentation patterns appear to relate to these major fault systems. Depocentres of earlier seams in the Tivoli Formation were restricted to the northern part of the basin, marked by the F1 system. A major depocentre
shift occurred before the end of the deposition of the Tivoli Formation as a result of subsidence in the south that conformed to the F2 system configuration. The Blackstone Formation depocentres shifted to the east (Depocentre 1) and west (Depocentre 2) simultaneously. This depocentre shift was associated with the flexural subsidence produced by the
rejuvenation of the West Ipswich Fault. Coal accumulation mainly occurred in Depocentre 1.
Two types of seam splitting occurred in the Ipswich Basin. Sedimentary splitting or autosedimentation was produced by frequent influx of clastic sediments. The fluvial dominant depositional environments created the
random distribution of small seam splits. However, the coincidence of seam splits and depocentres found in some of the seams suggests tectonic splitting. Furthermore, the progressive splitting pattern, which displays seam splits overlapping, was associated with continued basin subsidence. The tectonic splitting pattern is more dominant in the Ipswich Basin.
Alternating bright bands shown in the brightness profiles are a result of oscillating water cover in the peat-mire. Moderate groundwater level, which was maintained during the development of the peat, reduced the possibility of salinisation and drowning of the peat swamp. On the other hand, a slow continuous rise of the groundwater table, that kept pace with the vertical growth of peat, prevented excessive oxidation of peat.
Ipswich coal is bright due to its high vitrinite content. The cutinite content is also high because the dominant flora was pteridosperms of Dicroidium assemblage containing waxy and thick cuticles. Petrographic study revealed that the depositional environment was telmatic with bog forest formed under ombrotrophic to mesotrophic hydrological conditions. The high preservation
of woody or structured macerals such as telovitrinite and semifusinite indicates that coal is autochthonous. The high mineral matter content in coal is possibly due to the frequent influx of clastic and volcanic sediments.
The Ipswich Basin is part of a much larger Triassic basin extending to Nymboida in New South Wales. Little is known of the coal as it lacks exposures. It is apparently thin to absent except in places like Ipswich and Nymboida. This study suggests that the dominant control on depocentres of thick coal at Ipswich has been the tectonism. Fluvial incursions and
volcanism were superimposed on this.
14
Chern, Peter Kyaw Zaw Naing. „Patterns of Coal Sedimentation in the Ipswich Basin Southeast Queensland“. Queensland University of Technology, 2004. http://eprints.qut.edu.au/15924/.
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The intermontane Ipswich Basin, which is situated 30km south-west of Brisbane, contains coal measures formed in the Late Triassic Epoch following a barren non-depositional period. Coal, tuff, and basalt were deposited along with fluvial dominated sediments. The Ipswich Coal Measures mark the resumption of deposition in eastern Australia after the coal hiatus associated with a series of intense tectonic activity in Gondwanaland during the Permo-Triassic interval. A transtensional tectonic movement at the end of the Middle Triassic deformed the Toogalawah Group before extension led to the formation of the Carnian Ipswich Coal Measures in the east. The Ipswich Coal Measures comprise the Brassall and Kholo Subgroups. The Blackstone Formation, which forms the upper unit of the Brassall Subgroup, contains seven major coal seams. The lower unit of the Brassall Subgroup, the Tivoli Formation, consists of sixteen stratigraphically significant coal seams. The typical thickness of the Blackstone Formation is 240m and the Tivoli Formation is about 500m. The coal seams of the Ipswich Basin differ considerably from those of other continental Triassic basins. However, the coal geology has previously attracted little academic attention and the remaining exposures of the Ipswich coalfield are rapidly disappearing now that mining has ceased. The primary aim of this project was to study the patterns of coal sedimentation and the response of coal seam characteristics to changing depositional environments. The coal accumulated as a peat-mire in an alluvial plain with meandering channel systems. Two types of peat-mire expansion occurred in the basin. Peat-mire aggradation, which is a replacement of water body by the peatmire, was initiated by tectonic subsidence. This type of peat-mire expansion is known as terrestrialisation. It formed thick but laterally limited coal seams in the basin. Whereas, peat-mire progradation was related to paludification and produced widespread coal accumulation in the basin. The coal seams were separated into three main groups based on the mean seam thickness and aerial distribution of one-meter and four-meter thickness contour intervals. Group 1 seams within the one-meter thickness interval are up to 15,000m2 in area, and seams within the four-meter interval have an aerial extent of up to 10,000m2. Group 1A contains the oldest seam with numerous intraseam clastic bands and shows a very high thickness to area ratio, which indicates high subsidence rates. Group 1B seams have moderately high thickness to area ratios. The lower clastic influx and slower subsidence rates favoured peat-mire aggradation. The Group 1A seam is relatively more widespread in aerial extent than seams from Group 1B. Group 1C seams have low mean thicknesses and small areas, suggesting short-lived peat-mires as a result of high clastic influx. Group 2 seams arebetween 15,000 and 35,000m2 in area within the one-meter interval, and between 5,000 and 10,000m2 within the four-meter interval. They have moderately high area to thickness ratios, indicating that peat-mire expansion occurred due to progressively shallower accommodation and a rising groundwater table. Group 3 seams, which have aerial extents from 35,000 to 45,000m2 within the one-meter thickness contour interval and from 10,000 to 25,000m2 within the four-meter interval, show high aerial extent to thickness ratios. They were deposited in quiet depositional environments that favoured prolonged existence of peat-mires. Group 3 seams are all relatively young whereas most Group 1 seams are relatively old seams. All the major fault systems, F1, F2 and F3, trend northwest-southeast. Apart from the West Ipswich Fault (F3), the F1 and F2 systems are broad Palaeozoic basement structures and thus they may not have had a direct influence on the formation of the much younger coal measures. However, the sedimentation patterns appear to relate to these major fault systems. Depocentres of earlier seams in the Tivoli Formation were restricted to the northern part of the basin, marked by the F1 system. A major depocentre shift occurred before the end of the deposition of the Tivoli Formation as a result of subsidence in the south that conformed to the F2 system configuration. The Blackstone Formation depocentres shifted to the east (Depocentre 1) and west (Depocentre 2) simultaneously. This depocentre shift was associated with the flexural subsidence produced by the rejuvenation of the West Ipswich Fault. Coal accumulation mainly occurred in Depocentre 1. Two types of seam splitting occurred in the Ipswich Basin. Sedimentary splitting or autosedimentation was produced by frequent influx of clastic sediments. The fluvial dominant depositional environments created the random distribution of small seam splits. However, the coincidence of seam splits and depocentres found in some of the seams suggests tectonic splitting. Furthermore, the progressive splitting pattern, which displays seam splits overlapping, was associated with continued basin subsidence. The tectonic splitting pattern is more dominant in the Ipswich Basin. Alternating bright bands shown in the brightness profiles are a result of oscillating water cover in the peat-mire. Moderate groundwater level, which was maintained during the development of the peat, reduced the possibility of salinisation and drowning of the peat swamp. On the other hand, a slow continuous rise of the groundwater table, that kept pace with the vertical growth of peat, prevented excessive oxidation of peat. Ipswich coal is bright due to its high vitrinite content. The cutinite content is also high because the dominant flora was pteridosperms of Dicroidium assemblage containing waxy and thick cuticles. Petrographic study revealed that the depositional environment was telmatic with bog forest formed under ombrotrophic to mesotrophic hydrological conditions. The high preservation of woody or structured macerals such as telovitrinite and semifusinite indicates that coal is autochthonous. The high mineral matter content in coal is possibly due to the frequent influx of clastic and volcanic sediments. The Ipswich Basin is part of a much larger Triassic basin extending to Nymboida in New South Wales. Little is known of the coal as it lacks exposures. It is apparently thin to absent except in places like Ipswich and Nymboida. This study suggests that the dominant control on depocentres of thick coal at Ipswich has been the tectonism. Fluvial incursions and volcanism were superimposed on this.
15
Sogoni, Msimelelo. „The paradox of enrichment in predator-prey systems“. University of Western Cape, 2020. http://hdl.handle.net/11394/7737.
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>Magister Scientiae - MScIn principle, an enrichment of resources in predator-prey systems show prompts destabilisation of a framework, accordingly, falling trophic communication, a phenomenon known to as the \Paradox of Enrichment" [54]. After it was rst genius postured by Rosenzweig [48], various resulting examines, including recently those of Mougi-Nishimura [43] as well as that of Bohannan-Lenski [8], were completed on this problem over numerous decades. Nonetheless, there has been a universal none acceptance of the \paradox" word within an ecological eld due to diverse interpretations [51]. In this dissertation, some theoretical exploratory works are being surveyed in line with giving a concise outline proposed responses to the paradox. Consequently, a quantity of di usion-driven models in mathematical ecology are evaluated and analysed. Accordingly, piloting the way for the spatial structured pattern (we denote it by SSP) formation in nonlinear systems of partial di erential equations [36, 40]. The central point of attention is on enrichment consequences which results toward a paradoxical state. For this purpose, evaluating a number of compartmental models in ecology similar to those of [48] will be of great assistance. Such displays have greater in uence in pattern formations due to diversity in meta-population. Studying the outcomes of initiating an enrichment into [9] of Braverman's model, with a nutrient density (denoted by n) and bacteria compactness (denoted by b) respectively, suits the purpose. The main objective behind being able to transform [9]'s system (2.16) into a new model as a result of enrichment. Accordingly, n has a logistic- type growth with linear di usion, while b poses a Holling Type II and nonlinear di usion r2 nb2 [9, 40]. Five fundamental questions are imposed in order to address and guide the study in accordance with the following sequence: (a) What will be the outcomes of introducing enrichment into [9]'s model? (b) How will such a process in (i) be done in order to change the system (2.16)'s stability state [50]? (c) Whether the paradox does exist in a particular situation or not [51]? Lastly, (d) If an absurdity in (d) does exist, is it reversible [8, 16, 54]? Based on the problem statement above, the investigation will include various matlab simulations. Therefore, being able to give analysis on a local asymptotic stability state when a small perturbation has been introduced [40]. It is for this reason that a bifurcation relevance comes into e ect [58]. There are principal de nitions that are undertaken as the research evolves around them. A study of quantitative response is presented in predator-prey systems in order to establish its stability properties. Due to tradeo s, there is a great likelihood that the growth rate, attack abilities and defense capacities of species have to be examined in line with reviewing parameters which favor stability conditions. Accordingly, an investigation must also re ect chances that leads to extinction or coexistence [7]. Nature is much more complex than scienti c models and laboratories [39]. Therefore, di erent mechanisms have to be integrated in order to establish stability even when a system has been under enrichment [51]. As a result, SSP system is modeled by way of reaction-di usion di erential equations simulated both spatially and temporally. The outcomes of such a system will be best suitable for real-world life situations which control similar behaviors in the future. Comparable models are used in the main compilation phase of dissertation and truly re ected in the literature. The SSP model can be regarded as between (2018-2011), with a stability control study which is of an original.
16
Grant, Vernon Matthew. „Effect of a structured exercise program on physical activity patterns and assessing relationships between accelerometry and strength and running performance characteristics in male, college students“. The University of Montana, 2010. http://etd.lib.umt.edu/theses/available/etd-08242010-134442/.
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The primary purpose of this study was to determine the effect of a supervised exercise training program on physical activity (PA) patterns. A secondary objective of the study was to determine if accelerometers can predict variables associated with strength and running performance. A total of 79 adult, male, college students completed a 12 week exercise training program that consisted of pull-ups, sit-ups, push-ups, and running three hours per week. The subjects trained three days/week (Monday, Wednesday, and Friday) and conducted a performance test (PT) every Wednesday. Physical activity (average daily time spent in sedentary, light, moderate, and vigorous PA), performance strength and running variables (pull-ups, sit-ups, push-ups, and 1.5 mile run time), and body composition (BC) (weight (kg), percent body fat (PBF), fat free mass (FFM;kg), and fat mass (FM;kg)) were assessed before and after 12 weeks of the exercise training program. Results showed the 12 week exercise training program had no effect on the average daily time (min) spent in sedentary, light, moderate or vigorous activity. There were significant positive correlations between average daily time spent in vigorous PA and pull-ups (p<.05), sit-ups (p<.01), and push-ups (p<.01). There were significant negative correlations between average daily time spent in moderate (p<.05) and vigorous (p<.01) PA and 1.5 mile run times. Additionally, there were significant negative correlations between BC and weight, PBF, and FM and pull-ups, sit-ups, and push-ups (p<.01). Data showed a a significant positive relationship between weight, PBF, and FM and 1.5 mile run time (p<.01). As expected, strength and running performance significantly improved in every area (p<0 .001) with an average gain of four pull-ups, 31 sit-ups, 15 push-ups, and a mean decrease of 30 seconds on the 1.5 mile run. The structured exercise intervention significantly improved strength and running performance characteristics, which included pull-ups, sit-ups, push-ups and a 1.5 mile run time. The results from this study show that the 12 week exercise training program did not affect PA levels in the participants but PA (vigorous) and BC (weight, PBF, and FM) may be able to predict pull-ups, sit-ups, push-ups, and 1.5 mile run performance variables.
17
Grenier, Charline. „Génération procédurale et rendu en temps réel de motifs structurés“. Electronic Thesis or Diss., Strasbourg, 2024. http://www.theses.fr/2024STRAD007.
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Dans un monde virtuel, les objets représentés sont décrits autant par leur géométrie que par le comportement lumineux de leur surface. Ce dernier est un élément important pour le réalisme de la scène créée. Pour simuler le comportement lumineux des surfaces, une méthode couramment utilisée consiste à recouvrir la géométrie des objets avec des textures.Dans cette thèse, nous nous intéressons aux textures stochastiques structurées. Et plus particulièrement à leur génération et à leur rendu multi-échelle en temps réel. Ces textures se caractérisent par un caractère stochastique qui leur donne une apparence plus organique et naturelle, et de brusques variations de couleur ou de contraste, faisant apparaître des motifs distincts que nous appelons structures.Nous proposons une nouvelle méthode de génération procédurale de motifs structurés. Celle-ci se base sur la composition d'un bruit procédural vectoriel par une fonction de transfert multi-variée. Cette méthode permet de tirer parti de la séparation entre l'information de structure, contenue dans la fonction de transfert, et le côté stochastique, apporté par le bruitIn a virtual world, objects represented are described as much by their geometry as by the luminous behaviour of their surface. The latter is an important element in the realism of the scene created. To simulate the luminous behaviour of surfaces, a commonly used method consists of covering the geometry of objects with textures.In this thesis, we focus on structured stochastic textures. More specifically, we are interested in their generation and rendering at different level of detail, in real time. These textures are characterised by a stochastic nature which gives them a more organic and natural appearance, and by abrupt variations in colour or contrast giving rise to distinct patterns which we call structures.We propose a new method for procedural generation of structured patterns. It is based on the composition of a procedural vector noise by a multivariate transfer function. This method takes advantage of the separation between the structural information contained in the transfer function and the stochastic information provided by the noise
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Sattari, Amir. „Investigations of Flow Patterns in Ventilated Rooms Using Particle Image Velocimetry : Applications in a Scaled Room with Rapidly Varying Inflow and over a Wall-Mounted Radiator“. Doctoral thesis, KTH, Installations- och energisystem, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-167804.
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This thesis introduces and describes a new experimental setup for examining the effects of pulsating inflow to a ventilated enclosure. The study aimed to test the hypothesis that a pulsating inflow has potential to improve ventilation quality by reducing the stagnation zones through enhanced mixing. The experimental setup, which was a small-scale, two-dimensional (2D), water-filled room model, was successfully designed and manufactured to be able to capture two-dimensional velocity vectors of the entire field using Particle Image Velocimetry (PIV). Using in-house software, it was possible to conclude that for an increase in pulsation frequency or alternatively in the flow rate, the stagnation zones were reduced in size, the distribution of vortices became more homogeneous over the considered domain, and the number of vortices in all scales had increased. Considering the occupied region, the stagnation zones were moved away in a favorable direction from a mixing point of view. In addition, statistical analysis unveiled that in the far-field occupied region of the room model, stronger eddies were developed that we could expect to give rise to improved mixing. As a fundamental experimental study performed in a 2D, small-scale room model with water as operating fluid, we can logically conclude that the positive effect of enhanced mixing through increasing the flow rate could equally be accomplished through applying a pulsating inflow. In addition, this thesis introduces and describes an experimental setup for study of air flow over a wall-mounted radiator in a mockup of a real room, which has been successfully designed and manufactured. In this experimental study, the airflow over an electric radiator without forced convection, a common room-heating technique, was measured and visualized using the 2D PIV technique. Surface blackening due to particle deposition calls for monitoring in detail the local climate over a heating radiator. One mechanism causing particle deposition is turbophoresis, which occurs when the flow is turbulent. Because turbulence plays a role in particle deposition, it is important to identify where the laminar flow over radiator becomes turbulent. The results from several visualization techniques and PIV measurements indicated that for a room with typical radiator heating, the flow over the radiator became agitated after a dimensionless length, 5.0–6.25, based on the radiator thickness. Surface properties are among the influencing factors in particle deposition; therefore, the geometrical properties of different finishing techniques were investigated experimentally using a structured light 3D scanner that revealed differences in roughness among different surface finishing techniques. To investigate the resistance to airflow along the surface and the turbulence generated by the surfaces, we recorded the boundary layer flow over the surfaces in a special flow rig, which revealed that the types of surface finishing methods differed very little in their resistance and therefore their influence on the deposition velocity is probably small.Det övergripande syftet med den första studien i avhandlingen var att undersöka hypotesen att ett pulserande inflöde till ett ventilerade utrymme har en potential till att förbättra ventilationens kvalitet genom att minska stagnationszoner och därigenom öka omblandningen. För genomförande av studien byggdes en experimentuppställning i form av en tvådimensionell (2D) småskalig modell av ett ventilerat rum. Strömningsmediet i modellen var vatten. Det tvådimensionella hastighetsfältet registrerades över hela modellen med hjälp av Particle Image Velocimetry (PIV). Vid ett stationärt tillflöde bildas ett stagnationsområde i centrum av rumsmodellen. Vid ett pulserade inflöde genererades sekundära virvlar. Med en egen utvecklad programvara var det möjligt att kvantifiera statistiken hos virvlarna. Det pulserade inflödet gjorde att inom området där det vid stationärt tillflöde fanns en stagnationszon ökade antalet virvlar i alla storlekar och fördelningen av virvlar blev mera homogen än tidigare. Detta kan förväntas ge upphov till förbättrad omblandning. Baserat på en grundläggande experimentell studie utförd i en småskalig tvådimensionell rumsmodell med vatten som strömningsmedium kan vi logiskt dra slutsatsen att ett pulserande tilluftsflöde har en potential att förbättra omblandningen. I en fortsatt studie i avhandlingen visuliserades och mättes hastighetsfältet och därefter beräknades statistiska värden av exempelvis medelhastighet, standardavvikelse och skjuvspänning hos hastighetsfluktuationerna i luftströmmen över en väggmonterad radiator med 2D-PIV-teknik. Bakgrunden till studien är att en bidragande orsak till partikelavsättning på väggytor är turbofores som uppträder vid en turbulent luftström. Studien genomfördes genom uppbyggnad av en fullskalig rumsmodell. Eftersom turbulens spelar en roll vid partikelavsättning genom turbofores är det viktigt att identifiera var det laminära flödet över radiatorn blir turbulent. Resultaten baserat på visualisering och PIV-mätningar indikerade att, för ett rum med denna typ av radiatoruppvärmning, blev flödet över radiatorn turbulent efter en dimensionslös längd lika med 5,0‒6,25 gånger radiatorns tjocklek. Ytors egenskaper är viktiga vid partikelavsättning. Därför har de geometriska egenskaperna hos några olika metoder för ytbehandling undersökts experimentellt med hjälp av en scanner för strukturerat 3D-ljus. Resultaten visar på skillnader i ytråhet hos de olika ytbehandlingsmetoderna. För att undersöka motståndet mot luftströmning längs ytan och den turbulens som genereras av ytorna registrerade vi gränsskiktsflödet över ytorna i en speciell luftströmningsrigg. Detta påvisade att motståndet hos de olika typerna av ytbehandlingsmetoder skilde sig mycket litet åt och därför är troligt vid deras påverkan på depositionshastigheten mycket liten.
QC 20150525
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Wong, C. C. „Novel defected ground structure patterns“. Thesis, University of Surrey, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.431128.
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Afsharnaderi, M. „Studies of coloured space patterns“. Thesis, City University London, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375826.
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Ash, Roisin L. „Perception of structure in auditory patterns“. Thesis, University of Stirling, 1998. http://hdl.handle.net/1893/26669.
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The present research utilised five tasks to investigate non-musicians' perception of phrase, rhythm, pitch and beat structure in unaccompanied Gaelic melodies and musical sequences. Perception of phrase structure was examined using: i) a segmentation task in which listeners segmented Gaelic melodies into a series of meaningful units and ii) a novel click localisation task whereby listeners indicated where they perceived a superimposed click in the melody had occurred. Listeners consistently segmented the melodies into units of 2.4 - 5.4 seconds. Clicks which were positioned before and after perceived boundaries (identified by segmentation) were perceptually migrated towards the boundary. These results suggest that listeners perceptually differentiate between phrasal groups in melodies (See Sloboda & Gregory, 1980; Stoffer, 1985, for similar results with musicians). Short term memory for rhythmic structure was examined using rhythm recall of computer generated sequences and Gaelic melodies. Computer generated rhythms with small tonal pitch intervals (1 - 4 semitones) were easier to recall than large atonal intervals (predominantly greater than 4 semitones). Recall of Gaelic melodies, containing repetitive rhythmic units, was better than recall of computer sequences. Pitch reversal of Gaelic melodies did not effect recall. Beat-tapping with three Gaelic melodies revealed that the majority of listeners established the underlying beat 1.5 - 3 seconds (5 - 6 notes) after the start of the melodies. Perception of meaning and content in two note melodic intervals and three Gaelic melodies was examined using an adjective pair two-alternative forced choice task. Responses to musical intervals showed evidence of perceptual similarity based mainly on interval size. Perceived information content in the melodies increased significantly by the fourth note. The results suggest that the amounts of Gaelic melody which are: i) required to establish an underlying beat, ii) remembered after one hearing, and iii) perceptually grouped into a meaningful unit, include the unit of melody which is necessary to establish a basic meaning.
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Clarkson, Brian Patrick 1975. „Life patterns : structure from wearable sensors“. Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/8030.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, School of Architecture and Planning, Program in Media Arts and Sciences, February 2003.Includes bibliographical references (leaves 123-129).
In this thesis I develop and evaluate computational methods for extracting life's patterns from wearable sensor data. Life patterns are the reoccurring events in daily behavior, such as those induced by the regular cycle of night and day, weekdays and weekends, work and play, eating and sleeping. My hypothesis is that since a "raw, low-level" wearable sensor stream is intimately connected to the individual's life, it provides the means to directly match similar events, statistically model habitual behavior and highlight hidden structures in a corpus of recorded memories. I approach the problem of computationally modeling daily human experience as a task of statistical data mining similar to the earlier efforts of speech researchers searching for the building block that were believed to make up speech. First we find the atomic immutable events that mark the succession of our daily activities. These are like the "phonemes" of our lives, but don't necessarily take on their finite and discrete nature. Since our activities and behaviors operate at multiple time-scales from seconds to weeks, we look at how these events combine into sequences, and then sequences of sequences, and so on. These are the words, sentences and grammars of an individual's daily experience. I have collected 100 days of wearable sensor data from an individual's life. I show through quantitative experiments that clustering, classification, and prediction is feasible on a data set of this nature. I give methods and results for determining the similarity between memories recorded at different moments in time, which allow me to associate almost every moment of an individual's life to another similar moment. I present models that accurately and automatically classify the sensor data into location and activity.
(cont.) Finally, I show how to use the redundancies in an individual's life to predict his actions from his past behavior.
by Brian Patrick Clarkson.
Ph.D.
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Engin, Elif. „The Relationship Between Self-concept Structure And Behavioral Flexibility: A Model Relating Cognitive Structures To Behavioral Patterns“. Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605169/index.pdf.
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Self-concept structure has been extensively studied in the literature especially with
regard to its relationship with psychological adjustment. However, the behavioral
outcomes of the cognitive structure of the self and the mechanisms through which the
relationship between self-concept structure and psychological adjsutment operate are
still to be maintained. This study offered that the two dimensions of self-concept
structure, differention and integration, would be related to the two dimensions of
behavioral flexibility: Behavioral repertoire and deliberate adjustment of behaviors.
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Differentiation, tapping behavioral repertoire, was assumed to determine whether a
person is flexible or rigid, while integration tapping deliberate adjustment were
supposed to determine the quality of flexibility (i.e., whether the repertoire is controlled
by the individual or by situational factors). By crossing these two dimensions, a model
with four behavioral patterns was proposed: (1) Functional flexibility, characterized by
both high integration and high differentiation(2) situational flexibility, characterized by high differentiation but low integration
(3) stereotypical rigidity, characterized by low differentiation but high integration, and (4) effacing rigidity, which is low on both dimensions. Three studies were conducted on university students (N = 163, N = 123 and N = 242 for the three studies respectively) in order to test this model. Results revealed that the behavioral repertoire dimension of behavioral flexibility was linked to selfconcept differentiation, whereas the deliberate adjustment dimension was related to selfconcept integration. Functional flexibility and effacing rigidity patterns were clearly specified by measures of psychological adjustment, locus of control, need for cognition, need for approval and Big Five dimensions. Stereotypical rigidity and situational flexibilty patterns, however, seemed to require more elaboration. The model offering that flexibility mediates the link between self-concept structure and self-esteem was not supported.
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Bhuta, Arvind Aniel Rombawa. „Variation in the structure, composition, and dynamics of a foundation tree species at multiple scales and gradients“. Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/40487.
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Scientists and land managers often focus on the Southeastern Plains and Coastal Plain of the southeastern United States when considering the ecology, restoration, and management of longleaf pine (Pinus palustris P. Mill.) communities and ecosystems. However, the range of this foundation tree species and its associated communities and ecosystems also extend into the Piedmont and Montane Uplands: the Piedmont of Alabama, Georgia, North and South Carolina and Virginia; the Ridge and Valley of Alabama and Georgia; and the Southwestern Appalachians of Alabama. The composition, structure, and dynamics of Piedmont and Montane Uplands longleaf pine communities have been understudied compared to their Southeastern Plains and Coastal Plain counterparts, and knowledge is based on historical accounts and a handful of studies at site-specific scales. The biogeography and ecology of Piedmont and Montane Uplands longleaf pine communities differ significantly from those in the Southeastern Plains and Coastal Plain. My research combines geospatial and ecological approaches to provide insights on current composition, structure, and dynamics of longleaf pine communities in the Southeastern Plains, Piedmont, and Ridge and Valley at multiple scales and highlights differences and similarities with communities in the Coastal Plain. The Piedmont and Montane Uplands longleaf pine communities showed high variation in canopy tree diversity compared to those in the Coastal Plain. Longleaf pine was sometimes the only canopy tree, while in other communities longleaf pine was one constituent in a mixed oak-pine canopy. My study showed that longleaf pine communities were not just restricted to south-facing slopes as previously thought, but were found on northwestern-facing slopes as well. Analysis of tree rings across my study sites showed that as longleaf pine approaches its northern range margin in the Piedmont and Montane Uplands, its radial growth is restricted by minimum temperature especially at longleaf pineâ s elevational, latitudinal, and longitudinal extremes; at all sties radial growth was influenced by drought and precipitation. At the local scale, I found that an Alabama Piedmont longleaf pine community showed a diameter-class distribution typical of an old-growth site but contrary to current knowledge, diameter was not a good indicator of age.Ph. D.
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García, Padilla Marta. „Optimization of thin sheet structures with patterns perforations“. Master's thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/13712.
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Mestrado em Engenharia MecânicaNowadays, metal storage systems are generally used in industrial companies. The several stages of the metallic structures design are based in the standard EN 15512:2009. However, this standard do not the most efficient design solution, only design constraints. In this work, it is intended to improve the structural elements that are on the base of the metal storage systems, particularly shelves, in order to reduce costs and increase the structure stiffness, enforcing the international standard that define the characteristics of these products. The main purpose is the optimization of a representative section of profiled steel component taking into account the variable thickness, geometry and number of perforations. In order to do this a computational finite element model is developed and pre-‐validated, replacing a numerous set of experimental tests in a design of Experiments (DoE) methodology. The optimized solutions were obtained through a response surface optimization methodology (RSM). The final results were analysed and discussed.
Hoje em dia, os sistemas metálicos de armazenamento são vulgarmente utilizados pela indústria. As várias etapas de projeto destas estruturas metálicas são baseadas na norma EN 15512:2009. No entanto, esta norma não propõe a solução de projeto mais eficiente, apenas as suas restrições. Neste trabalho, pretende-‐se aperfeiçoar os elementos estruturais que estão na base dos sistemas de armazenamento de metal, particularmente prateleiras, a fim de reduzir custos e aumentar a rigidez da estrutura, satisfazendo a norma internacional que define as características necessárias desses produtos. O objetivo principal é a otimização de uma secção representativa do componente de aço perfilado tendo em conta as variáveis espessura, geometria e número de perfurações. Para isso, é desenvolvido e validado um modelo computacional de elementos finitos, substituindo um numeroso conjunto de testes experimentais numa metodologia de Design of Experiments (DoE). As soluções otimizadas são obtidas através de uma metodologia de otimização baseada numa superfície de resposta (RSM). Os resultados finais são analisados e discutidos.
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Gupta, Pratibha. „Gray Code Composite Pattern Structured Light Illumination“. UKnowledge, 2007. http://uknowledge.uky.edu/gradschool_theses/438.
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Structured light is the most common 3D data acquisition technique used in the industry. Traditional Structured light methods are used to obtain the 3D information of an object. Multiple patterns such as Phase measuring profilometry, gray code patterns and binary patterns are used for reliable reconstruction. These multiple patterns achieve non-ambiguous depth and are insensitive to ambient light. However their application is limited to motion much slower than their projection time. These multiple patterns can be combined into a single composite pattern based on the modulation and demodulation techniques and used for obtaining depth information. In this way, the multiple patterns are applied simultaneously and thus support rapid object motion. In this thesis we have combined multiple gray coded patterns to form a single Gray code Composite Pattern. The gray code composite pattern is projected and the deformation produced by the target object is captured by a camera. By demodulating these distorted patterns the 3D world coordinates are reconstructed.
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Jackson, Jarom Silver. „Mechanically Scanned Interference Pattern Structured Illumination Imaging“. BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/7483.
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A method of lensless, single pixel imaging is presented. This method, referred to as MAS-IPSII, is theoretically capable of resolutions as small as one quarter of the wavelength of the imaging light. The resolution is not limited by the aperture of any optic, making high resolutions (including subwavelength) feasible even at very large (greater than a meter) distances. Imaging requires only flat optics and a coherent source, making it a good candidate for imaging with extreme wavelengths in the UV and x-ray regimes. The method is demonstrated by the imaging of various test targets. Both real and complex imaging (i.e. holography) is demonstrated.
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Zhang, Xin Iris, und 張欣. „Fast mining of spatial co-location patterns“. Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B30462708.
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Lefford, M. Nyssim 1968. „The structure, perception and generation of musical patterns“. Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/28781.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, School of Architecture and Planning, Program in Media Arts and Sciences, 2004.Includes bibliographical references (p. 149-151).
Structure distinguishes music from noise. When formulating that structure, musical artists rely on both mental representations and sensory perceptions to organize pitch, rhythm, harmony, timbre and dynamics into musical patterns. The generative process may be compared to playing a game, with goals, constraints, rules and strategies. In this study, games serve as a model for the interrelated mechanisms of music creation, and provide a format for an experimental technique that constrains creators as they generate simple rhythmic patterns. Correlations between subjects' responses and across experiments with varied constraints provide insight into how structure is defined in situ and how constraints impact creators' perceptions and decisions. Through the music composition games we investigate the nature of generative strategizing, refine a method for observing the generative process, and model the interconnecting components of a generative decision. The patterns produced in these games and the findings derived from observing how the games are played elucidate the roles of metric inference, preference and the perception of similarity in the generative process, and lead us to a representation of generative decision tied to a creator's perception of structure.
M. Nyssim Lefford.
Ph.D.
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Wilding, Nigel Blair. „Studies of structural patterns at phase transitions“. Thesis, University of Edinburgh, 1991. http://hdl.handle.net/1842/13233.
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The work described in this thesis comprises two distinct components. In the first part, Monte-Carlo computer simulation methods are employed within a finite-size scaling framework to investigate both universal and non-universal behaviour in two scalar models, the 1-d φ4 model and the 2-d Lennard-Jones fluid. In both these models the properties of interest are obtained from studies of the large-length scale configurational patterns via measurements of the probability distribution function (PDF) of the coarse-grained (block) ordering variable. For the 1-d φ4 model, simulations are employed to obtain the block PDF of the spin variable. This function is shown to map onto an analytically-derived expression for the 1-d Ising chain, thus exposing the model's essentially Ising-like character. It is further demonstrated that the corrections to the limiting form of the block PDF reflect system-specific features of the 1-d φ4 model associated with its elementary excitations. In the 2-d Lennard-Jones fluid, the combined use of simulation and finite-size scaling is shown to provide a powerful method for accurately determining the location of the liquid-vapour coexistence curve and critical point. At the critical point, the limiting form of the coarse-grained density distribution is found to collapse onto a previously determined function characteristic of the 2-d Ising model, thereby confirming and clarifying fluid-magnet universality. Clear evidence is also presented for mixing of the temperature and chemical potential in the two relevant scaling fields-a phenomenon responsible for the failure of the law of rectilinear diameter. As an addendum, a discussion is given of the prospects for generalising to fluids, the cluster updating techniques recently developed to reduce critical slowing down in simulations of spin systems.
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Choudhury, Sabyasachy. „Hierarchical Data Structures for Pattern Recognition“. Thesis, Indian Institute of Science, 1987. https://etd.iisc.ac.in/handle/2005/74.
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Pattern recognition is an important area with potential applications in computer vision, Speech understanding, knowledge engineering, bio-medical data classification, earth sciences, life sciences, economics, psychology, linguistics, etc. Clustering is an unsupervised classification process corning under the area of pattern recognition. There are two types of clustering approaches:
1) Non-hierarchical methods 2) Hierarchical methods. Non-hierarchical algorithms are iterative in nature and. perform well in the context of isotropic clusters. Time-complexity of these algorithms is order of (0 (n) ) and above, Hierarchical agglomerative algorithms, on the other hand, are effective when clusters are non-isotropic. The single linkage method of hierarchical category produces a dendrogram which corresponds to the minimal spanning tree, conventional approaches are time consuming requiring O (n2 ) computational time.
In this thesis we propose an intelligent partitioning scheme for generating the minimal spanning tree in the co-ordinate space. This is computationally elegant as it avoids the computation of similarity between many pairs of samples me minimal spanning tree generated can be used to produce C disjoint clusters by breaking the (C-1) longest edges in the tree.
A systolic architecture has been proposed to increase the speed of the algorithm further. Simulation study has been conducted and the corresponding results are reported. The simulation package has been developed on DEC-1090 in Pascal. It is observed based on the simulation study that the parallel implementation reduces the time enormously. The number of processors required for the parallel implementation is a constant making the approach more attractive.
Texture analysis and synthesis has been extensively studied in the context of computer vision, Two important approaches which have been studied extensively by researchers earlier are statistical and structural approaches, Texture is understood to be a periodic pattern with primitive sub patterns repeating in a particular fashion. This has been used to characterize texture with the help of the hierarchical data structure, tree. It is convenient to use a tree data structure as, along with the operations like merging, splitting, deleting a node, adding a node, etc, .it would be useful to handle a periodic pattern. Various functions like angular second moment, correlation etc, which are used to characterize texture have been translated into the new language of hierarchical data structure.
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Choudhury, Sabyasachy. „Hierarchical Data Structures for Pattern Recognition“. Thesis, Indian Institute of Science, 1987. http://hdl.handle.net/2005/74.
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Pattern recognition is an important area with potential applications in computer vision, Speech understanding, knowledge engineering, bio-medical data classification, earth sciences, life sciences, economics, psychology, linguistics, etc. Clustering is an unsupervised classification process corning under the area of pattern recognition. There are two types of clustering approaches:
1) Non-hierarchical methods 2) Hierarchical methods. Non-hierarchical algorithms are iterative in nature and. perform well in the context of isotropic clusters. Time-complexity of these algorithms is order of (0 (n) ) and above, Hierarchical agglomerative algorithms, on the other hand, are effective when clusters are non-isotropic. The single linkage method of hierarchical category produces a dendrogram which corresponds to the minimal spanning tree, conventional approaches are time consuming requiring O (n2 ) computational time.
In this thesis we propose an intelligent partitioning scheme for generating the minimal spanning tree in the co-ordinate space. This is computationally elegant as it avoids the computation of similarity between many pairs of samples me minimal spanning tree generated can be used to produce C disjoint clusters by breaking the (C-1) longest edges in the tree.
A systolic architecture has been proposed to increase the speed of the algorithm further. Simulation study has been conducted and the corresponding results are reported. The simulation package has been developed on DEC-1090 in Pascal. It is observed based on the simulation study that the parallel implementation reduces the time enormously. The number of processors required for the parallel implementation is a constant making the approach more attractive.
Texture analysis and synthesis has been extensively studied in the context of computer vision, Two important approaches which have been studied extensively by researchers earlier are statistical and structural approaches, Texture is understood to be a periodic pattern with primitive sub patterns repeating in a particular fashion. This has been used to characterize texture with the help of the hierarchical data structure, tree. It is convenient to use a tree data structure as, along with the operations like merging, splitting, deleting a node, adding a node, etc, .it would be useful to handle a periodic pattern. Various functions like angular second moment, correlation etc, which are used to characterize texture have been translated into the new language of hierarchical data structure.
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Buzmakov, Aleksey. „Analyse formelle de concepts et structures de patrons pour la fouille de données structurées“. Thesis, Université de Lorraine, 2015. http://www.theses.fr/2015LORR0112/document.
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Aujourd'hui de plus en plus de données de différents types sont accessibles. L’Analyse Formelle de Concepts (AFC) et les pattern structures sont des systèmes formels qui permettent de traiter les données ayant une structure complexe. Mais le nombre de concepts trouvé par l’AFC est fréquemment très grand. Pour faire face à ce problème, on peut simplifier la représentation des données, soit par projection de pattern structures, soit par introduction de contraintes pour sélectionner les concepts les plus pertinents. Le manuscrit commence avec l'application de l’AFC à l’exploration de structures moléculaires et la recherche de structures particulières. Avec l’augmentation de la taille des ensembles de données, de bonnes contraintes deviennent essentielles. Pour cela on explore la stabilité d'un concept et on l'applique à l’exploration d'un ensemble de données de substances chimiques mutagènes. La recherche de concepts stables dans cet ensemble de données nous a permis de trouver de nouveaux candidats mutagènes potentiels qui peuvent être interprétés par les chimistes. Cependant, pour les cas plus complexes, la représentation simple par des attributs binaires ne suffit pas. En conséquence, on se tourne vers des pattern structures qui peuvent traiter différents types de données complexes. On étend le formalisme original des projections pour avoir plus de liberté dans la manipulation de données. On montre que cette extension est essentielle pour analyser les trajectoires de patients décrivant l’historique de l’hospitalisation des patients. Finalement, le manuscrit se termine par une approche originale et très efficace qui permet de trouver directement des motifs stablesNowadays, more and more data of different kinds is becoming available. Formal concept analysis (FCA) and pattern structures are theoretical frameworks that allow dealing with an arbitrary structured data. But the number of concepts extracted by FCA is typically huge. To deal with this problem one can either simplify the data representation, which can be done by projections of pattern structures, or by introducing constraints to select the most relevant concepts. The manuscript starts with application of FCA to mining important pieces of information from molecular structures. With the growth of dataset size good constraints begin to be essential. For that we explore stability of a concept, a well-founded formal constraint. Finding stable concepts in this dataset allows us finding new possible mutagenetic candidates that can be further interpreted by chemists. However for more complex cases, the simple attribute representation of data is not enough. Correspondingly, we turn to pattern structures that can deal with many different kinds of descriptions. We extend the original formalism of projections to have more freedom in data simplification. We show that this extension is essential for analyzing patient trajectories, describing patients hospitalization histories. Finally, the manuscript ends by an original and very efficient approach that enables to mine stable patterns directly
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Kayastha, Shilva. „New methods of multiscale chemical space analysis : visualization of structure-activity relationships and structural pattern extraction“. Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAF042/document.
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Cette thèse est dédiée à l’analyse systématique de l’espace chimique, et des relations structure-activité (SAR) en particulier. L’ouvrage présente des nouveaux protocoles d’analyse combinant des méthodes classiques et originales, dans le but d’analyser les SAR à l’échelle globale ainsi que locale. L’analyse globale des espaces chimiques repose sur la recherche des motifs structuraux privilégiés par cartographie topographique générative (GTM), ainsi que par analyse classique des « châssis » moléculaires. La cartographie a été ensuite couplée avec l’analyse de réseaux chimiques (CSN), permettant une transition de la vue globale vers l’analyse locale de SAR. L’optimisation mutiobjectif des propriétés de potentiels médicaments a été adressé par la méthode « star coordinates ». L’analyse locale des SAR inclut des nouvelles stratégies pour prédire les discontinuités dans le paysage structure-activité biologique, et une étude de l’impact de la structure sur l’ionisation des molécules. Des matrices SAR ont servi pour monitorer le progrès dans l’optimisation de nouveaux principes actifsThis thesis presents studies devoted to aid in systematic analysis of chemical spaces, focusing on mining and visualization of structure-activity relationships (SARs). It reports some new analysis protocols, combining both existing and on-purpose developed novel methodology to address both large-scale and local SAR analysis. Large-scale analysis featured both generative topographic mapping (GTM)-based extraction of privileged structural motifs and scaffold analysis. GTM was combined with chemical space network (CSN) to develop a visualization tool providing global-local views of SAR in large data sets. We also introduce star coordinates (STC) to visualize multi-property space and prioritize drug-like subspaces. Local SAR monitoring includes new strategies to predict activity cliffs using support vector machine models and a study of structural modifications on ionization state of compounds. The SAR matrix methodology was applied to objectively evaluate SAR progression during lead optimization
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Eklöv, Peter. „Effects of behavioural flexibility and habitat complexity on predator-prey interactions in fish communities“. Doctoral thesis, Umeå universitet, Ekologi och geovetenskap, 1995. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-101769.
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Cook, Kathryn B. „Epipelagic zooplankton community structure : spatial patterns in abundance, species composition and size structure“. Thesis, Swansea University, 2001. https://cronfa.swan.ac.uk/Record/cronfa42911.
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Dewey, John Eliot. „American uncovered : structures and patterns of immigrant health uninsurance“. Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/37745.
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In this thesis I investigate disparities in U.S. immigrants’ access to health insurance, a strong proxy for differential access to quality care in the American non-universalized health system. The United States is notorious among industrialized nations for its high proportion of uninsured residents—about 15% of the total population. U.S. immigrants, however, lack health insurance at a rate nearly double or triple the national average. The immigrant uninsurance problem has been exacerbated by large-scale, deliberate economic and political adjustments to American health insurance institutions, and immigrants’ structural relations to these institutions. The two institutions I scrutinize in this thesis are (1) the employer-sponsored insurance system for immigrant workers, and (2) government-sponsored insurance systems for lower-income immigrants in need. Using a combination of primary and secondary data analysis, expert interviews, and a synthesis of multidisciplinary research, I map out the recent history and driving logic(s) of the immigrant uninsurance phenomenon, both for the United States in the 1980s-1990s and for the “case study” of Minnesota in the 2000s. During the 1980s and 1990s, new immigrants to the United States in need of health coverage were “squeezed” by both of the largest health insurance institutions. First, immigrants were negatively affected by a polarized private labor market that increasingly limited its provision of health insurance benefits to those workers at the higher end(s) of the skill/income spectrum. Second, immigrants were actively targeted by a federal government that decided to explicitly exclude many of them from the protection of the national health insurance safety net. The end result of these negative “stresses” was that by the 2000s, immigrants’ chances of obtaining health insurance were at once increasingly “personalized” (i.e. dependent upon immigrants’ individual and community characteristics), and increasingly dependent upon localized economic, political, and institutional contexts. In Minnesota, for example, the immigrant uninsurance rate in the 2000s remained lower than the national average. This outcome was enabled, however, by specific demographic and institutional contexts unavailable in most other states. The health insurance system for immigrants in the 2000s, in other words, became increasingly geographically fragmented and contingent.
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Ovadya, Aviv. „Origami transformers : folding orthogonal structures from universal hinge patterns“. Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/62667.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2010.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 57) and index.
We investigate a new approach to origami design using simple universal hinge patterns where the crease patterns for different shapes are just different subsets of a common hinge pattern. Several algorithms have previously been developed to design folded states for particular shapes, but they require a different crease pattern for each shape. Our motivations include the development of robotic "origami transformers," artistic tools, and theoretical insights. We show how to compose "cube gadgets" to fold any N-cube polycube from an O(N) x O(N) rectangle of paper, using only O(N 2 ) time to compute the parameters of the unambiguous folding sequence. We also describe extensions of our basic algorithm to larger classes of shapes with improved paper efficiency. Finally, we demonstrate that an implementation of this technique can actually be used to partially automate geometric paper folding.
by Aviv Ovadya.
M.Eng.
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Gaudreau, Marie-Andrée. „Description de l’évolution du savoir infirmier chez les infirmières en prévention et contrôle des infections ayant suivi un cours en microbiologie et infectiologie“. Mémoire, Université de Sherbrooke, 2015. http://hdl.handle.net/11143/7707.
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Résumé : L’Ordre des infirmières et infirmiers du Québec (OIIQ) a créé en 2011 une spécialisation pour les infirmières en PCI qui doivent maintenant suivre une formation de 2e cycle pour l’obtention de leur titre d’infirmière clinicienne spécialisée en PCI. Au sein de cette formation figure un cours de microbiologie et infectiologie (MI) qui vise à parfaire les connaissances et l’expertise en la matière. Jusqu’à présent, aucune étude n’avait été réalisée pour évaluer l’influence de ce cours sur le savoir infirmier des infirmières en PCI. Cette étude vise à décrire l’évolution du savoir infirmier des infirmières en PCI qui participent au cours de MI du programme de 2e cycle en PCI. Un devis qualitatif descriptif a été utilisé au cours de cette étude pour décrire l’évolution du savoir infirmier. Le modèle de réflexion structurée (MRS) de Johns (1995) a servi à l’élaboration d’entrevues semi-dirigées individuelles avant et après le cours de MI, afin de permettre l’identification du savoir infirmier selon un processus déductif. La méthode de codification de Miles et Huberman (2003) a ensuite favorisé un processus semi-inductif. Une analyse horizontale a finalement permis de repérer les récurrences ou les changements dans le savoir infirmier entre les entrevues de chaque participante ainsi qu’entre les participantes elles-mêmes. Des manifestations des dimensions du savoir infirmier telles que définies par Johns et influencées par Carper (1978) sont décrites, ainsi que l’évolution du savoir infirmier suite à la participation au cours de MI. Les thèmes qui ont découlé des entrevues sont : le développement d’un vocabulaire favorisant la communication dans l’équipe, la capacité d’aller au-delà des protocoles, une meilleure confiance en leurs capacités et l’élargissement d’une vision éthique qui comprend tous les acteurs de la communauté. Les retombées de l’étude se retrouvent au plan de la formation par la mise en valeur de la perspective infirmière dans le cours de MI et par l’évolution du savoir infirmier après avoir suivi ce cours. Sur le plan de la recherche, cette étude présente une nouvelle approche, pour de futures recherches, permettant d’évaluer la contribution d’un cours universitaire.Abstract : As the Ordre des infirmières et infirmiers du Québec (OIIQ) has created in 2011 a specialty, making it possible for nurses to develop their expertise in infection prevention and control (IPC). In order to become an IPC clinical nurse specialist, nurses must fulfil a graduate program, which includes a course in microbiology and infectious diseases (MID), among others. Until now, there has been no study evaluating the influence of this training or course on patterns of knowing in nursing for IPC nurses. The goal of this study was to determine the evolution of the patterns of knowing in nursing for IPC nurses who have completed an MID course as part of a graduate program in IPC. A qualitative descriptive evaluation made it possible to determine the evolution of the patterns of knowing. Johns’ model (1995) for structured reflection (MSR) which was used in semi-structured, individual interviews before and after an MID course, helped identify patterns of knowing through a deductive process. Furthermore, Miles and Huberman’s (2003) codification method ensured a semi-inductive process. A horizontal analysis allowed for the detection of recurrence or change in patterns of knowing between each participant’s interviews, as well as between participants. The illustration of the scope of the patterns of knowing in nursing, as defined by Johns and influenced by Carper (1978), as well as the evolution of the patterns of knowing after completing an MID course, were described. The topics that surfaced during the interviews were: the development of a vocabulary fostering team communication, the capacity to go beyond protocols, a greater confidence in their abilities, and the expansion of an ethical view that includes all stakeholders in the community. The benefits of the study are at the level of training and research. Training is represented by the development of nursing perspective in the MID courses and the development of nursing knowledge after completing a course in MID. Finally, towards the research, this has put forward a new approach to assess the contribution of a university course.
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Otaki, Keisuke. „Algorithmic Approaches to Pattern Mining from Structured Data“. 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/215673.
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The contents of Chapter 6 are based on work published in IPSJ Transactions on Mathematical Modeling and Its Applications, vol.9(1), pp.32-42, 2016.Kyoto University (京都大学)
0048
新制・課程博士
博士(情報学)
甲第19846号
情博第597号
新制||情||104(附属図書館)
32882
京都大学大学院情報学研究科知能情報学専攻
(主査)教授 山本 章博, 教授 鹿島 久嗣, 教授 阿久津 達也
学位規則第4条第1項該当
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Cavaturu, Raja Kalyan Ram. „Motion Correction Structured Light using Pattern Interleaving Technique“. UKnowledge, 2008. http://uknowledge.uky.edu/gradschool_theses/551.
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Phase Measuring Profilometry (PMP) is the most robust scanning technique for static 3D data acquisition. To make this technique robust to the target objects which are in motion during the scan interval a novel algorithm called ‘Pattern Interleaving’ is used to get a high density single scan image and making Phase Measuring Profilometry insensitive to ‘z’ motion and prevent motion banding which is predominant in 3D reconstruction when the object is in motion during the scan time
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Wang, Minghao. „Hybrid Single and Dual Pattern Structured Light Illumination“. UKnowledge, 2015. http://uknowledge.uky.edu/ece_etds/74.
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Structured Light Illumination is a widely used 3D shape measurement technique in non-contact surface scanning. Multi-pattern based Structured Light Illumination methods reconstruct 3-D surface with high accuracy, but are sensitive to object motion during the pattern projection and the speed of scanning process is relatively long. To reduce this sensitivity, single pattern techniques are developed to achieve a high speed scanning process, such as Composite Pattern (CP) and Modified Composite Pattern (MCP) technique. However, most of single patter techniques have a significant banding artifact and sacrifice the accuracy. We focus on developing SLI techniques can achieve both high speed, high accuracy and have the tolerance to the relative motion. We first present a novel Two-Pattern Full Lateral Resolution (2PFLR) SLI method utilizing an MCP pattern for non-ambiguous phase followed by a single sinusoidal pattern for high accuracy. The surface phase modulates the single sinusoidal pattern which is demodulated using a Quadrature demodulation technique and then unwrapped by the MCP phase result. A single sinusoidal pattern reconstruction inherently has banding error. To effective de-band the surface, we propose Projector Space De-banding algorithm (PSDb). We use projector space because the band error is aligned with the projector coordinates allowing more accurate estimation of the banding error. 2PFLR system only allows the relative motion within the FOV of the scanner, to extend the application of the SLI, we present the research on Relative Motion 3-D scanner which utilize a single pattern technique. The pattern in RM3D system is designed based on MCP but has white space area to capture the surface texture, and a constellation correlation filter method is used to estimate the scanner's trajectory and then align the 3-D surface reconstructed by each frame to a point cloud of the whole object surface.
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Kurra, Goutham. „Pattern Recognition in Large Dimensional and Structured Datasets“. University of Cincinnati / OhioLINK, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1014322308.
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Millaire, Jean-Francois. „Moche burial patterns : an investigation into prehispanic social structure“. Thesis, University of East Anglia, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368168.
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Pautasso, Marco. „Large scale patterns and determinants of avian assemblage structure“. Thesis, University of Sheffield, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.420999.
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Yu, Xuewei. „Interconnections between regional industrial structure and energy consumption patterns“. Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53853.
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The human society exerts its influence on the ecosystem through economic activities. While the robustness of an economy manifests through its industrial structure, human impact on nature is well represented by an economy's energy consumption patterns. Therefore, evaluating the industrial structure and unraveling its interconnection with energy consumption is crucial for achieving sustainable development.
In this dissertation, I address the topic from several perspectives. First, I start with an exploratory analysis on the industrial structure itself, developing an easy measure, revealed comparative dependence (RCD), to compare regional dependence on sectors. Building on the RCD measure, I indirectly evaluate the economic resilience of U.S. states by quantifying their economic diversity. Second, I bring the measure for industrial structure into context with energy consumption patterns. RCD is used to characterize sector interactions, which are then used to explain the historical trend of regional energy consumption. I find that while the expansion of low energy intensity sectors does reduce energy use, these sectors' level of interaction with other sectors also plays a key role in determining energy use. As a third step, I investigate how regional structure affects an economy's response towards energy efficiency improvements, i.e., the economy-wide rebound effect. My regional computable general equilibrium (CGE) model proves that production-side energy efficiency improvement induces moderate rebound effects, while feeding back into the industrial structure by changing sectoral production scale in different directions. I also identify sectors being able to trigger different levels of energy saving and energy rebound, and explore the mechanism for their impact propagation throughout the industrial structure.
This study establishes the linkage between regional industrial structure and energy consumption from different perspectives. From the scientific perspective, it improves the fundamental understanding of how industrial structure and energy consumption are intricately connected to each other. From the policy perspective, it informs policy makers of the importance of considering sector interaction when designing energy policies, as well as the effectiveness of efficiency measures in achieving energy conservation.
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Fan, Xiaojing Jessie. „Ethnic differences in preference structure and budget allocation patterns /“. The Ohio State University, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487844948076749.
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Davis, Richard. „Patterns in Fish Community Structure in a Regulated River“. VCU Scholars Compass, 2010. http://scholarscompass.vcu.edu/etd/73.
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I examined the abundance, composition, and distribution of fish communities in the lower Roanoke River, a hydropeaking system in North Carolina. Fishes were sampled at before and after peaking events over three years; 2007 to 2009. I evaluated trends in species richness, diversity, and assemblage composition. There were no significant differences in either richness or diversity suggesting consistent trends in richness and diversity throughout the study. I used non-metric multidimensional scaling (NMDS) to create a community composition model. Fish composition was noticeably greater post-peaking and changed minimally across time and event. There were no statistically significant differences in species composition among pre or post peaking samples, sites, or years (ANOSIM p < 0.05). I concluded that the small amount of fish community variation observed supports the possibility that the present assemblage has adapted to a regulated flow regime, however a direct relationship between peaking and community composition cannot be established. Additionally, fishes were sampled at three longitudinal sites during summer months of 2007 to 2009. I examined fish community composition to assess longitudinal gradients away from the source of peaking. Differences among fish species within each longitudinal site were examined by use of trophic and habitat/reproductive guilds. Statistically significant differences were detected between both trophic and reproductive guilds among sites and therefore aided in creating a pattern of longitudinal separation in community structure. The fish community of the Roanoke River between Roanoke Rapids and Hamilton does not appear to show signs of variation that may be attributed exclusively to hydropeaking. Changes in hydrology, river morphometry and topography, and habitat structure may account for the longitudinal variation observed in the community structure analyses. The Roanoke River has been regulated for over 50 years. It is possible that the existing fish community has adapted to fluctuating flows created by seasonal hydropeaking. I concluded that in order to develop an appropriate community model and evaluate the full extent of changes in fish community characteristics over time long-term monitoring is needed in the Roanoke River.
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Evangelista, Rinaldo. „Embodied and disembodied patterns of innovation and industrial structure“. Thesis, University of Sussex, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360521.
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Wilkerson, Diana Faissal. „Youth Assault-Injury Variation Patterns and Their Dimensional Structure“. ScholarWorks, 2015. https://scholarworks.waldenu.edu/dissertations/1832.
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Youth assault-injury is 1 of the 5 leading causes of adolescents' death in the United States. Despite public health efforts, the prevalence rates of youth assault-injury and almost all its risk factors have remained consistent in the past 10 years. The purpose in conducting this cross-sectional quantitative study using archival data of the Add Health Wave II in-home survey was to examine the underlying-multidimensional structure of youth assault-injury. Problem behavior theory (PBT) lens and a multidimensional model were used and a structural equation model was conducted to examine the relationships between 22 risk and protection variables, 3 unobserved latent factors, and assault-injury, while controlling for demographics. Three questions were answered that addressed whether the multidimensional model: (a) explained the underlying structure of youth assault-injury among the indicator variables and latent factors; (b) explained the relationships between assault-injury and indicator variables and latent factors; and (c) revealed whether the interaction among latent factors influenced assault-injury likelihood. The study results were affirmative for the 3 questions and explained the relationships between youth assault-injury and various risk and protection behaviors that researchers failed to examine in the past decade. The results also illustrated disagreements with many of the PBT's assumptions. Further research is necessary to affirm or dispute the study's results. The findings highlighted key intervention areas for adolescents' assault-injury prevention and control. Should public health practitioners use these study results, positive social change will occur from saving youths lives and altering their efforts toward positive contribution in their surroundings.