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Dissertations / Theses on the topic 'Preferential attachment'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 July 2025

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1

Mönch, Christian. "Distances in preferential attachment networks." Thesis, University of Bath, 2013. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607617.

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Preferential attachment networks with power law degree sequence undergo a phase transition when the power law exponent τ changes. For τ > 3 typical distances in the network are logarithmic in the size of the network and for 2 < τ < 3 they are doubly logarithmic. In this thesis, we identify the correct scaling constant for τ ∈ (2, 3) and discover a surprising dichotomy between preferential attachment networks and networks without preferential attachment. This contradicts previous conjectures of universality. Moreover, using a model recently introduced by Dereich and Mörters, we study the critic
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2

Peterson, Nicholas Richard. "On Random k-Out Graphs with Preferential Attachment." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1370527839.

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3

Hébert-Dufresne, Laurent. "On the growth and structure of social systems following preferential attachment." Doctoral thesis, Université Laval, 2014. http://hdl.handle.net/20.500.11794/25331.

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L’inégalité est une caractéristique notoire des systèmes sociaux. Dans cette thèse, nous nous attarderons à la distribution et à la structure de la répartition de leurs ressources et activités. Dans ce contexte, leurs extrêmes iniquités tendent à suivre une propriété universelle, l’indépendance d’échelle, qui se manifeste par l’absence d’échelle caractéristique. En physique, les organisations indépendantes d’échelle sont bien connues en théorie des transitions de phase dans laquelle on les observe à des points critiques précis. Ceci suggère que des mécanismes bien définis sont potentiellement
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4

Chin-Lee, Jao-ke. "How to Win Ratings and Influence Reviewers: Preferential Attachment in Rating Systems." Thesis, Harvard University, 2015. http://nrs.harvard.edu/urn-3:HUL.InstRepos:14398548.

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In this paper we introduce the concept of preferential attachment in the context of recommendation and rating systems. We present several models incorporating different qualities that may manifest in such systems, such as inherent bias, and examine the resulting degree distributions (i.e. ratings) as snapshots and through time. We then take preliminary steps towards testing real-world feasibility with the Yelp Academic Dataset.
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5

Youssef, Bassant El Sayed. "Models for the Generation of Heterogeneous Complex Networks." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/54009.

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Complex networks are composed of a large number of interacting nodes. Examples of complex networks include the topology of the Internet, connections between websites or web pages in the World Wide Web (WWW), and connections between participants in social networks.Due to their ubiquity, modeling complex networks is importantfor answering many research questions that cannot be answered without a mathematical model. For example, mathematical models of complex networks can be used to find the most vulnerable nodes to protect during a virus attack in theInternet, to predict connections between web
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6

Maia, Rodrigo Filev. "Uma arquitetura de controle de qualidade de serviço aplicada a redes heterogêneas e serviços convergentes." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/3/3141/tde-16082010-130303/.

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Um dos objetivos das próximas gerações dos sistemas de comunicação é permitir que os usuários acessem e distribuam um ou mais serviços a qualquer hora, em qualquer lugar, independentemente do tipo de terminal (telefone convencional, telefone celular, assistentes pessoais digitais, notebooks, dentre outros) ou da tecnologia da rede de acesso utilizados. Esse cenário é denominado convergência de serviços utilizando-se redes heterogêneas, e em tal realidade, as arquiteturas de qualidade de serviço existentes em cada uma das tecnologias dos sistemas de comunicação não oferecem mecanismos de intero
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7

Dabkowski, Matthew Francis. "Using Network Science to Estimate the Cost of Architectural Growth." Diss., The University of Arizona, 2016. http://hdl.handle.net/10150/612431.

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Between 1997 and 2009, 47 major defense acquisition programs experienced cost overruns of at least 15% or 30% over their current or original baseline estimates, respectively (GAO, 2011, p. 1). Known formally as a Nunn-McCurdy breach (GAO, 2011, p. 1), the reasons for this excessive growth are myriad, although nearly 70% of the cases identified engineering and design issues as a contributing factor (GAO, 2011, p. 5). Accordingly, Congress legislatively acknowledged the need for change in 2009 with the passage of the Weapon Systems Acquisition Reform Act (WSARA, 2009), which mandated additional
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8

Zheng, Huanyang. "SOCIAL NETWORK ARCHITECTURES AND APPLICATIONS." Diss., Temple University Libraries, 2017. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/470889.

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Computer and Information Science<br>Ph.D.<br>Rather than being randomly wired together, the components of complex network systems are recently reported to represent a scale-free architecture, in which the node degree distribution follows power-law. While social networks are scale-free, it is natural to utilize their structural properties in some social network applications. As a result, this dissertation explores social network architectures, and in turn, leverages these architectures to facilitate some influence and information propagation applications. Social network architectures are analyz
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9

Luo, Hongwei, and Hongwei luo@rmit edu au. "Modelling and simulation of large-scale complex networks." RMIT University. Mathematical and Geospatial Sciences, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080506.142224.

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Real-world large-scale complex networks such as the Internet, social networks and biological networks have increasingly attracted the interest of researchers from many areas. Accurate modelling of the statistical regularities of these large-scale networks is critical to understand their global evolving structures and local dynamical patterns. Traditionally, the Erdos and Renyi random graph model has helped the investigation of various homogeneous networks. During the past decade, a special computational methodology has emerged to study complex networks, the outcome of which is identified by tw
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10

Santos, Bruno Vitorio dos. "Múltiplos assuntos no modelo de opiniões contínuas e ações discretas (CODA)." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/100/100132/tde-11122013-163456/.

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Entendimento de processos que levem ao surgimento de opiniões extremas é valioso na prevenção de atos de violência. Os modelos são ferramentas úteis para identificar possíveis padrões relacionados a estes processos. No entanto, modelos discretos ou contínuos com confiança limitada não se mostram adequados para estudar dinâmicas caracterizadas pela divergência de opiniões. É proposta uma extensão cultural do modelo de Opiniões Contínuas e Ações Discretas (CODA) com múltiplos assuntos alternados por um mecanismo de ligação preferencial. Os agentes são influenciados não só em suas opiniões, mas t
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11

Ma, Qi. "Reinforcement in Biology : Stochastic models of group formation and network construction." Doctoral thesis, Uppsala universitet, Analys och tillämpad matematik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-186989.

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Empirical studies show that similar patterns emerge from a large number of different biological systems. For example, the group size distributions of several fish species and house sparrows all follow power law distributions with an exponential truncation. Networks built by ant colonies, slime mold and those are designed by engineers resemble each other in terms of structure and transportation efficiency. Based on the investigation of experimental data, we propose a variety of simple stochastic models to unravel the underlying mechanisms which lead to the collective phenomena in different syst
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12

Betken, Carina. "Limit theorems in preferential attachment random graphs." Doctoral thesis, 2019. https://repositorium.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-201905171547.

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We consider a general preferential attachment model, where the probability that a newly arriving vertex connects to an older vertex is proportional to a (sub-)linear function of the indegree of the older vertex at that time. We provide a limit theorem with rates of convergence for the distribution of a vertex, chosen uniformly at random, as the number of vertices tends to infinity. To do so, we develop Stein's method for a new class of limting distributions including power-laws. Similar, but slightly weaker results are shown to be deducible using coupling techniques. Concentrating on a specifi
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13

(10177886), Valentina Concu. "Preferential Attachment and Language Change: werden in German." Thesis, 2021.

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<div>This study explores historical syntactic changes within a complex network framework focusing on the development of the German verb <i>werden</i> (to become) and the emergence of the related passive and future periphrases. The data are collected from a corpus of Middle and Early New High German texts and the analysis of the instances is carried out in two different stages. The first stage focuses on the frequency of the verb <i>werden</i> and the elements that co-occurred with it throughout Middle and Early New High German. The second stage investigates the same instances through a complex
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14

Duan, Cheng-Yu, and 段正有. "Exploring the impact of preferential attachment on social media." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/ghpgwh.

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碩士<br>輔仁大學<br>資訊管理學系碩士班<br>107<br>Nowdays, the social media and internet users are universal, users’ choice of social media is increasing, but users have different needs for choosing social media, in addition, does the users sharing of knowledge on social media have an impact on their personal needs? However, this study explore the perspectives of preferential attachment, self-referential value, group reference value and entertainment reference value, trying to explore the impact of preferential attachment , self-referential value, group reference value and entertainment reference on social me
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15

Bloem-Reddy, Benjamin Michael. "Random Walk Models, Preferential Attachment, and Sequential Monte Carlo Methods for Analysis of Network Data." Thesis, 2017. https://doi.org/10.7916/D8348R5Q.

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Networks arise in nearly every branch of science, from biology and physics to sociology and economics. A signature of many network datasets is strong local dependence, which gives rise to phenomena such as sparsity, power law degree distributions, clustering, and structural heterogeneity. Statistical models of networks require a careful balance of flexibility to faithfully capture that dependence, and simplicity, to make analysis and inference tractable. In this dissertation, we introduce a class of models that insert one network edge at a time via a random walk, permitting the location of new
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16

Wan, Phyllis. "Application of Distance Covariance to Extremes and Time Series and Inference for Linear Preferential Attachment Networks." Thesis, 2018. https://doi.org/10.7916/D8Q25GQB.

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This thesis covers four topics: i) Measuring dependence in time series through distance covariance; ii) Testing goodness-of-fit of time series models; iii) Threshold selection for multivariate heavy-tailed data; and iv) Inference for linear preferential attachment networks. Topic i) studies a dependence measure based on characteristic functions, called distance covariance, in time series settings. Distance covariance recently gathered popularity for its ability to detect nonlinear dependence. In particular, we characterize a general family of such dependence measures and use them to meas
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17

Chen, Po-Ting, and 陳柏廷. "A study to probe emotional feeling and preferential attachment toward different shapes of bonsai based on professional viewpoint." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/57790740351589923806.

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碩士<br>東海大學<br>景觀學系<br>99<br>There is a variety of plants in Taiwan bonsai. As a bonsai is a miniature of natural landscape, many people like to use it for gardening or indoor decoration. The bonsai is one part of plant growing, and the plant growing is an essential element in landscape. Over the past few years on discussing the landscape, most of the researches focused on the aesthetics and the space layout of plant growing, and most of the probes were made based on the linear and plane dimensions. As to the research on single element “bonsai”, the research cases were very few, and could be c
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18

Grining, Krzysztof. "Privacy-preserving protocols in unreliable distributed systems." Doctoral thesis, 2020. https://depotuw.ceon.pl/handle/item/3778.

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This thesis concerns chosen problems of privacy preserving data aggregation. It is based on differential privacy, which is a mathematically rigorous privacy definition resilient to post-processing. Differential privacy is connected with randomization of the result. The goal is to achieve both sufficient privacy and accuracy. We are interested in practical scenarios, so we consider aggregation in distributed systems with unreliable nodes and untrusted aggregator. First, we analyse current state-of-the-art solution and show that despite good asymptotical guarantees for the accuracy, in many prac
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