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Improved Approximation Algorithms for Box Contact RepresentationsBekos, Michael A., van Dijk, Thomas C., Fink, Martin, Kindermann, Philipp, Kobourov, Stephen, Pupyrev, Sergey, Spoerhase, Joachim, Wolff, Alexander 27 January 2016 (has links)
We study the following geometric representation problem: Given a graph whose vertices correspond to axis-aligned rectangles with fixed dimensions, arrange the rectangles without overlaps in the plane such that two rectangles touch if the graph contains an edge between them. This problem is called Contact Representation of Word Networks (Crown) since it formalizes the geometric problem behind drawing word clouds in which semantically related words are close to each other. Crown is known to be NP-hard, and there are approximation algorithms for certain graph classes for the optimization version, Max-Crown, in which realizing each desired adjacency yields a certain profit. We present the first O(1)-approximation algorithm for the general case, when the input is a complete weighted graph, and for the bipartite case. Since the subgraph of realized adjacencies is necessarily planar, we also consider several planar graph classes (namely stars, trees, outerplanar, and planar graphs), improving upon the known results. For some graph classes, we also describe improvements in the unweighted case, where each adjacency yields the same profit. Finally, we show that the problem is APX-complete on bipartite graphs of bounded maximum degree.
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Prise en compte de la dépression en oncologie : les coulisses de la recherche / Consideration of depression in oncology : the scenes of researchRhondali, Wadih 12 December 2013 (has links)
Ce travail s'est intéresser aux difficultés de la prise en charge de la dépression en explorant plusieurs niveaux de représentations : celui des soignants, des patients, de leur famille. La dépression est une pathologie fréquente en oncologie avec une prévalence d’environ 15% qui augmente avec l'aggravation de la maladie cancéreuse. Elle aggrave les autres symptômes tels que la douleur, la fatigue, l'anxiété et retentit sur la qualité de vie et la survie des patients. La prise en charge spécifique du cancer est plus difficile chez les patients déprimés. Les différents objectifs de cette recherche sont de déterminer les freins de la prise en charge de la pathologie dépressive en oncologie et de sensibiliser les soignants à cette problématique en proposant une réflexion sur les modalités de prise en charge. Après une avoir effectué une revue de la littérature, nous avons débuté un travail de traduction et validation d’une échelle de dépistage de la dépression qui semblait adapté à notre population et aux modalités de prise en charge. Cette échelle a ensuite été proposée et utilisée en routine dans différents lieux de prise en charge. Elle a permis de confirmer les résultats retrouvés dans la littérature internationale quant à la fréquence de la dépression et son association avec d’autres symptômes. Ce travail a été complété par une évaluation de la concordance entre l’évaluation par le patient, le médecin et l’infirmier de la symptomatologie dépressive. Les niveaux de concordance retrouvés étaient faibles. Des résultats similaires ont été retrouvés lorsque l’on s’est intéressé à l’utilisation de différentes méthodes pour évaluer la dépression chez la personne âgée atteinte d’un cancer en phase avancée. Nous avons complété ce travail par une étude rétrospective ayant pour objectif d’évaluer l’impact de l’intervention d’une équipe de soins de support sur la sévérité de la dépression des patients atteints d’un cancer en phase avancée avec des résultats positifs, ainsi qu’une synthèse de la littérature quant aux traitements pharmacologiques existants pour la dépression.La dernière partie a utilisé une autre approche de la dépression avec pour objectif d’évaluer les représentations sociales de la dépression dans plusieurs groupes (soignants et famille de patients. Après une discussion générale de ce travail ainsi que la présentation des limites, nous conclurons par les perspectives quant à la prise en charge de la dépression en oncologie. / This work is exploring the associated issues with the management of depression among cancer patients by exploring several levels of representations: health care professionals, patients and patients’ families. Depression is a common disease in oncology with a prevalence of 15%, which increases with the worsening of the cancer disease. It worsens other symptoms such as pain, fatigue, anxiety and impacts patients’ quality of life and survival. Furthermore, cancer specific management is more difficult among depressed patients. The different objectives of this research were to explore the barriers to depression management in oncology and to make health care porfessional aware of this disease by proposing a reflection on the modalities of care.After having conducted a literature review, we started a study to translate and validate a depression screening scale that seemed suited to our population and modalities of care. This scale was then proposed and used routinely in different places of care. Our results were consistent with the international literature regarding the prevalence of depression and its association with other symptoms. We have then explored correlation between depression assessment by the patient, the physician and the nurse. The levels of agreement were found weak. Similar results were found in another study exploring the use of different methods to assess depression in elderly patients with advanced cancer.After these studies, we conducted a retrospective study aiming to evaluate the impact of the intervention of a supportive care team on the severity of depression in advanced cancer patients with positive results and a summary of the existing literature on depression pharmacological treatments.The last part used a different approach to depression study with the goal to assess social representations of depression in several groups (health care professionals, patients and their family). After a general discussion of this work and the presentation of limitations, we conclude with the prospects for the management of depression in oncology.
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Exploring Attention to Numerical Features in Proportional Reasoning: The Role of Representations, Context, and Individual DifferencesHurst, Michelle Ann Roddy January 2017 (has links)
Thesis advisor: Sara Cordes / Human infants show relatively sophisticated abilities to track and use proportional information. However, by the age of 6, children tend to make predictable errors in their proportional reasoning and later encounter significant challenges in many aspects of formal fraction learning. Thus, one of the central questions motivating this research is to identify the factors leading to these difficulties, in light of evidence of early intuitions about these concepts. In the current dissertation, I address this question by investigating the tradeoff between attending to proportional magnitude information and discrete numerical information about the components (termed “numerical interference”) across both spatial (i.e., area models, number lines) and symbolic (fractions, decimals) representations of proportion information. These explorations focus on young children (5-7 year olds) who have yet to receive formal fraction instruction, older children (9-12 year olds) who are in the process of learning these concepts, and adults who have already learned formal fractions. In Project 1, I investigated how older children and adults map between symbolic and spatial representations, particularly focusing on their strategies in highlighting componential information versus magnitude information when solving these mapping tasks. In Projects 2 and 3, I explore the malleability of individual differences in this numerical interference in 4- to 7-year-old children. Across the three projects, I suggest that although numerical interference does impact proportional reasoning, this over-attention to number can be reduced through modifying early experiences with proportional information. These findings have implications for education and the way we conceptualize numerical interference more generally. / Thesis (PhD) — Boston College, 2017. / Submitted to: Boston College. Graduate School of Arts and Sciences. / Discipline: Psychology.
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A 'coloured' history, a black future: contesting the dominant representations in the media through hip-hop beatsMarco, Derilene 08 October 2009 (has links)
M.A.(Media Studies), Faculty of Humanities, University of the Witwatersrand, 2009 / This research will critically analyse “conscious” hip-hop music and the way in
which it contests media and mainstream ideas in the media. Conscious hip-hop
refers to rap music that critically engages with hegemonic discourses and
popular culture. It is framed and named in this manner by both the performers/
artists themselves as well as by leading hip-hop scholars within South Africa and
globally. This research uses the music of Godessa and Brasse Vannie Kaap to
interrogate representations of Black identities and gender in society.
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One or More External Representations: What Is Better for Learning?Ermakova, Anna V. January 2016 (has links)
Thesis advisor: Elida V. Laski / Use of base-10 decomposition strategy for addition in first grade is related to mathematics advantage in the later years (Geary et al., 2013), yet we know little about the strategy’s prevalence among first graders or factors contributing to its use. The present study sought to bridge this gap by testing 87 first graders in the greater Boston area. The results confirmed previous findings that showed that in the last 10 years first graders in the US have increased in frequency of base-10 decomposition. Children who had better knowledge of basic number facts used it more frequently, particularly on problems with smaller addends. Further, the study tested whether an instructional intervention would be effective in increasing reliance on base-10 decomposition. 61 of the original participants were selected to take part in an experimental intervention that taught them to execute the strategy while relying on external representations – sometimes known as manipulatives. Informed by two lines of research, the present study tested the hypothesis that the efficacy of the intervention may depend on whether one or multiple external representations are used for instruction. The results showed a dramatic increase in first graders’ mental base-10 decomposition use as a result of the intervention. Children grew in their use of the strategy at the same rates across genders, levels of basic arithmetic fluency, and working memory. Overall, the results showed that relying on multiple representations during instruction appears more beneficial to strategy use on mental arithmetic, but this benefit may be conditional on how well the children have mastered and abstracted the strategy. Implications to classroom interventions aimed to increase the use of advanced arithmetic strategies are discussed. / Thesis (PhD) — Boston College, 2016. / Submitted to: Boston College. Lynch School of Education. / Discipline: Counseling, Developmental and Educational Psychology.
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The experience of osteoarthritis in older adultsAlwan, Claire January 2000 (has links)
Aims: This study aims to explore the experience of osteoarthritis (OA) in older adults, drawing on concepts from the literature on chronic illness including social-cognition models (e.g. Self-Regulatory Model) and cognitive concepts (e.g. self-schema). Design and Participants: A qualitative research design and Phenomenological Interpretative Analysis Methodology were used. Sixteen participants were interviewed. Ten were recruited from an orthopaedic surgical waiting list source and six from a GP source: age ranged from 67 to 79 years, and history of osteoarthritis ranged from one to 35 years. Measures: A semi-structured interview schedule was designed and piloted, based on the research literature. Results: Analysis identified the following themes: Demands of OA (pain, impact on activity, and impact on mood); Perceptions ofOA (onset/deterioration, cause, label, seriousness, prognosis); Strategies to manage OA (use of health services, changes in behaviour, psychological strategies, appraisal of strategies); Perception of Self (compared to past/future/others) and Contextual factors (age, co-morbidity, waiting list). Links between themes were reciprocal, and a tentative model ofOA is presented. Implications: A comprehensive model of the experience of chronic illness could provide a framework to guide interventions for direct clinical interventions (e.g. adjustment to chronic illness, pain management, identification of psychological comorbidity) and indirect interventions (e.g. consultancy with other health professionals).
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ADE and affine ADE bundles over complex surfaces with pg = 0. / CUHK electronic theses & dissertations collectionJanuary 2013 (has links)
我们研究了P[subscript g]=0 的复曲面x 上的ADE 向量丛和仿射ADE 向量丛。 / 首先,我们假设x 上有一个ADE 奇异点。这个奇异点在极小分解Y 中的例外轨迹是一条相应形式的ADE 曲线。利用这条ADE 曲线和向量丛的扩张,我们构造了Y 上的一个ADE 向量丛,而且这个向量丛可以下降到x上。此外,我们利用Y 上( -1)- 曲线的组合,描述了他们的极小表示向量丛。 / 其次,我们假设x 是一个椭圆曲面,而且x 上有一个仿射ADE 形式的奇异纤维。类似于以前,我们构造了X 上的一个仿射ADE 向量丛,而且这个向量丛在这条仿射ADE 曲线上的每一个不可约成分上都是平凡的。 / 然后,当X 是P²上突起n ≤9 个点时, x 上有一个典型的En 向量丛。我们详细的研究了x 的几何和这个E[subscript n] 向量丛的可变形性之间的关系。 / We study ADE and affine ADE bundles over complex surfaces X with P[subscript g] = 0. / First, we suppose X admits an ADE singularity. The exceptional locus of this singularity in the minimal resolution Y is an ADE curve of corresponding type. Using this ADE curve and bundle extensions, we construct an ADE bundle over Y which can descend to X. Furthermore, we describe their minuscule representation bundles in terms of configuration of (reducible) (-1)-curves. / Second, we assume X is an elliptic surface with a singular fiber of affine ADE type. Similar to above studies, we construct the affine ADE bundle over X which is trivial on each irreducible component of the affine ADE curve. / Third, when X is the blowup of P² at n ≤9 points, there is a canonical E[subscript n] bundle over it. We give a detailed study of the relationship between the geometry of X and the deformability of this bundle. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Chen, Yunxia. / On t.p. "g" is subscript. / Thesis (Ph.D.)--Chinese University of Hong Kong, 2013. / Includes bibliographical references (leaves 84-87). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstracts also in Chinese. / Chapter I --- ADE bundles --- p.9 / Chapter 1 --- ADE Lie algebra bundles --- p.10 / Chapter 1.1 --- ADE singularities --- p.10 / Chapter 1.2 --- ADE bundles --- p.12 / Chapter 2 --- Minuscule representations and ( -1)-curves --- p.16 / Chapter 2.1 --- Standard representations --- p.16 / Chapter 2.2 --- Minuscule representations --- p.17 / Chapter 2.3 --- Configurations of ( -1)-curves --- p.17 / Chapter 2.4 --- Minuscule representations from ( -1)-curves --- p.19 / Chapter 2.5 --- Bundles from ( -1)-curves --- p.21 / Chapter 2.6 --- Outline of Proofs for g ≠E₈ --- p.22 / Chapter 3 --- A[subscript n] case --- p.24 / Chapter 3.1 --- A[subscript n] standard representation bundle Lη^(An,Cn+1) --- p.24 / Chapter 3.2 --- An Lie algebra bundle Sη^(An) --- p.28 / Chapter 3.3 --- An minuscule representation bundle Lη^(An,^kCn+1) --- p.28 / Chapter 4 --- Dn case --- p.30 / Chapter 4.1 --- Dn standard representation bundle Lη^(Dn;C2n) --- p.30 / Chapter 4.2 --- Dn Lie algebra bundle Sη^(Dn) --- p.34 / Chapter 4.3 --- Dn spinor representation bundles Lη^(Dn;S±06) --- p.34 / Chapter 5 --- En case --- p.39 / Chapter 5.1 --- E₆ case --- p.39 / Chapter 5.2 --- E₇ case --- p.42 / Chapter 5.3 --- E₈ case --- p.44 / Chapter 6 --- Proof of Theorem 1.2.1 --- p.45 / Chapter II --- Affine ADE bundles --- p.50 / Chapter 7 --- Affine ADE Lie algebra bundles --- p.51 / Chapter 7.1 --- Affine ADE curves --- p.51 / Chapter 7.2 --- Affine ADE bundles --- p.53 / Chapter 8 --- Trivialization of E₀ gover Ci's after deformations --- p.57 / Chapter 8.1 --- Trivializations in loop ADE cases --- p.58 / Chapter 8.2 --- Trivializations in affine ADE cases --- p.60 / Chapter 8.3 --- Proof (except the loop E₈ case) --- p.60 / Chapter 8.4 --- Proof for the loop E₈ case --- p.62 / Chapter III --- Deformability --- p.65 / Chapter 9 --- En-bundle over Xn with n≤9 --- p.66 / Chapter 9.1 --- En-bundle over Xn with n ≤ 9 --- p.66 / Chapter 9.2 --- Deformability of such E₀E₈ --- p.68 / Chapter 9.3 --- Negative curves in X9 --- p.70 / Chapter 9.4 --- Proof of Theorems 9.2.1 and 9.2.2 --- p.75 / Chapter A --- Minuscule configurations --- p.78 / Chapter B --- A ffine Lie algebras --- p.80
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Politics of anxiety : the imago turci in early modern English prose, c.1550-1620Schmuck, Stephan January 2007 (has links)
In sixteenth- and early seventeenth-century England, portrayals of the Turk reflected aspects of Christian thinking. More specifically, these views varied according to ideological outlook, place and time. To complicate matters further, while there are a variety of images of the Turk responding to a range of Christian concerns, the nexus of images of the Turk - the imago Turci – is essentially contradictory. English portrayals and responses to the Turks are not uniform, but vary, while the Turk operates at once both from within and at a distance from English culture in the sixteenth and early seventeenth century. In other words, the Turk is both real and imagined. This project is a response to these issues. It examines the ways in which Turks - both real and imagined - not only figure in early modem English prose texts as a site of their cultural production, perpetuation, and negotiation, but also the ways in which these images relate to and participate in current political and cultural debates that also informed these prose texts. As a consequence of the diversity of the imago Turci in a wide range of available, printed prose works, I adopt five categorical distinctions representing five groups of overlapping genres, or modes for my analysis: history, religion, travel, mercantile writings and romance. Reading the material in their historical contexts, one of the arguments to arise from this is that the use of the Turk in these English texts reflects the wider cultural and political developments in Western Christendom and England, and between Christendom and the Ottoman Empire. The central argument of this project is that the imago Turci in early modem English prose emerges as a complex discursive site in which a variety of competing interests are negotiated.
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Sphères d'influence des schémas d'attachement sur Internet et dans la vie quotidienne / Spheres of influence of attachment schema on the Internet and in everyday lifeDanet, Marie 08 December 2014 (has links)
Des recherches ont mis en évidence l’influence des modèles d’attachement sur les relations amicales, amoureuses et sociales. Cela interroge sur la portée de cette influence. La concordance observée entre les représentations d’attachement liées aux différentes relations suggère une généralisation des modalités d’attachement. Dans l’étude 1, nous explorons l’existence d’une influence des représentations d’attachement sur les relations dans l’environnement virtuel. L’étude 2 explore la généralisation des modalités d’attachement à des situations de la vie quotidienne ainsi que le rôle de l’insécurité dans la généralisation excessive et le caractère envahissant des schémas d’attachement. L’étude 1 (256 adultes tout-venant) comporte des auto-questionnaires, remplis en ligne, sur les relations d’attachement, l’usage d’Internet et le dévoilement de soi. Certains (n=56) ont aussi passé un entretien d’attachement. L’étude 2 (89 adultes tout-venant, dont 56 de l’étude 1) comporte un entretien d’attachement et un entretien de vie quotidienne. Les résultats de ces études indiquent :1) un lien entre l’attachement et l’usage social d’Internet, médiatisé par une recherche de communication sécurisée et un dévoilement de soi ; 2) une généralisation partielle de l’attachement au père aux situations du quotidien ; 3) un lien entre l’attachement à la mère et le degré de flexibilité face aux situations du quotidien. Tandis que les représentations d'attachement implicites sont liées au comportement au quotidien, le style d'attachement auto rapporté est lui davantage lié aux comportements sur Internet. Les limites, perspectives futures et implications cliniques sont discutées. / Research suggests that attachment models influence friendships, romantic relationships and other relationships. The question remains as to the extent of their influence. Concordance between attachment representations of different relationships suggest a generalization of attachment patterns. In Study 1, we examine the possible influence of attachment representations on relationships established on the Internet. Study 2 explores generalization of attachment patterns in situations of everyday life, and the role of insecurity in excessive generalization and pervasiveness of attachment schemas. In study 1, 256 adults completed self-reports on line on attachment, the use of the Internet, and self-disclosure. An attachment interview was also administered to a subsample of 56 participants. The same interview was used in study 2, along with an interview on everyday behavior (N=89). Results show 1) associations between attachment and the social use of the Internet, 2) partial generalization of attachment to father and everyday behavior, and 3) a link between attachment to mother and flexibility in everyday behavior. Whereas implicit representations of attachment are associated with everyday behavior, explicit declarative attachment style is linked to reported behavior on the Internet. The limits, future perspectives, and clinical implications are discussed.
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Cosmos in London : South Africans writing London after 1948Thorpe, Andrea Susan January 2017 (has links)
Many critics have argued that Englishness was forged on the peripheries of the British Empire - that, as Simon Gikandi puts it, Englishness was "elsewhere". In this thesis, I take this argument in another direction, and ask whether travel to London enabled South Africans not only to think about London and Englishness, but also to forge ideas about South Africanness. In order to answer this question, I explore South African representations of London from 1948 onwards. I focus on the writing of Peter Abrahams, Dan Jacobson, Todd Matshikiza, Arthur Nortje, J.M. Coetzee, Justin Cartwright, and Isthtiyaq Shukri, providing an alternative and transnational history of both South African literature and London by exploring the interface between London and South African authors across a broad timespan. My comparison of the writing of Peter Abrahams and Dan Jacobson highlights London's role in the midst of important debates about liberalism, artistic independence and the role of the South African writer during apartheid. My study of Todd Matshikiza's London-based writing exemplifies the layered, transhistorical counterpoint between South Africa and London that is common to many South African narratives about London. Matshikiza's writing also includes references to other spaces - in his case, a global black imaginary - foregrounding the global resonances that are present in both London and South Africa. Arthur Nortje's poetry about London evinces a shifting dialectic between traumatic alienation and bodily embeddedness in the city, suggesting the need to rethink how exiled South African writers have engaged with places of exile. In my study of novels by Justin Cartwright and J.M. Coetzee, I focus on the metonymic role that London plays in South African writing, and explore how writing about London enables or occludes self-reflection on the part of "white" writers. In my epilogue, I read Ishtiyaq Shukri's The Silent Minaret (2005) in order to consider the interlinked histories of South Africa and London, but also to look forward and outwards to South African literature's broader global reach. In this thesis, I argue that a study of South African writing in London enriches our understanding of the historical development of South African culture and identity in response to exile, and specifically in relation to one of the most important international touchstones within the South African imaginary.
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