Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 65 for “"Directed Graph"”.
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Inferring Undirected and Causally Directed Graph Structures from Multivariate Time Series
… cortex of primates using a novel variation of undirected graph learning based on smoothness prior. In Part Two, we define and implement a novel spatiotemporal graph (STG) model for inferring causally directed graphs. Analysis of brain connectivity networks has a potential to advance our …
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Visualizing the conversation pathways of telephone linked care in a directed graph
Telephone linked care (TLC) is a telehealth intervention that has been shown to be effective in a variety of clinical settings. TLC is an interactive computerized telephone system. The system 'speaks' to patients, asking them questions and understanding their responses. There is logic built into …
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On the Existence of Knots and Links in the Complete Directed Graph on Six Vertices
… Gordon published "Knots and Links in Spatial Graphs" in the Journal of Graph Theory. In this paper, Conway and Gordon proved that the complete graph on six vertices is intrinsically linked. That is, any embedding of the complete graph on six vertices contains at least one pair of disjoint …
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An improved directed random walk framework for cancer classification using gene expression data
… cancer classification by introducing an improved directed random walk (DRW) framework. This improved DRW framework is proposed to identify risk pathway while correctly predict the significant genes. It is named as significant directed walk (SDW) because of its ability to identify significant genes …
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Eigenvalue Spacings of Transition Matrices Associated to Directed Graphs
… Markov chains and explores their applications to directed graphs. We derive an explicit expression for the error term in the convergence theorem in terms of the eigenvalues of the transition matrix. This expression reveals that the convergence behaviour is governed not only by the spectral gap but …
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Intelligent Memory Management Heuristics
… explore the use of statistical properties of the directed graph describing the set of live data to decide between garbage collection and heap expansion in a memory management algorithm combining the dynamic array represented heaps with a mark and sweep garbage collector to enhance its performance. …
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Translating Data Flow Graphs to Architectures
… language which is converted to a cyclic directed graph, called a data flow graph. Our design system takes this graph as input and translates it to an architecture and a control sequence which together realize the functional definition.
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Automating journey fare calculation for transport for London
… minimum distance. The algorithm operates on a directed graph model of the network. This thesis develops a method to structure the directed graph to capture the network's intricacies. Given a network and fare structure, the modified shortest path algorithm produces all path and fare information …
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Stabilization via smooth partitions, transversality and graphs
… edges. Stability is analyzed through the directed graph whose vertices are the subsets of the partition and whose arcs are consistent with the transversality. A strategy for the choice of partition is proposed using computable Pfaffian systems.
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Relating Thompson's group V to graphs of groups and Hecke algebras
… the first section, we take $\mathcal{G}$ to be a graph of groups, which acts on its universal cover, the Bass-Serre tree, by tree automorphisms. Brownlowe, Mundey, Pask, Spielberg and Thomas constructed a $C^*$-algebra for a graph of groups, writtten $C^*(\mathcal{G})$, which bears many …
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Geometry Of Quivers
<p>A quiver is a directed graph, but the term usually implies such a graph is being considered along with representations. These representations consist of vector spaces and linear transformations. We explore some the connections between quivers and geometric structures. To begin, we consider a …
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Fast spectral primitives for directed graphs
… linear time algorithms for a large class of directed graph problems including computing the stationary distribution of a Markov chain with only a logarithmic dependence on the mixing time. Our approach is based on developing new spectral tools for directed graphs, including the first …
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Finite Generation of Ext-Algebras for Monomial Algebras
The use of graphs in algebraic studies is ubiquitous, whether the graphs be finite or infinite, directed or undirected. Green and Zacharia have characterized finite generation of the cohomology rings of monomial algebras, and thereafter G. Davis determined a finite criteria for such generation in …
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Knitting with directed graphs
… structures by their geometry separate from a directed graph description of their topology. This thesis presents an algorithm that can generate a natural, deformed two-dimensional layout of Knit Meshes as well as a conversion pipeline that converts written hand knitting instructions to and from …
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REALIZING TOURNAMENTS AS MODELS FOR K-MAJORITY VOTING
<p>A <em>k</em>-majority tournament is a directed graph that models a <em>k</em>-majority voting scenario, which is realized by 2<em>k</em> - 1 rankings, called linear orderings, of the vertices in the tournament. Every <em>k</em>-majority voting scenario can be modeled by a tournament, but not …
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Decreasing Occlusion and Increasing Explanation in Interactive Visual Knowledge Discovery
… overlap. Each n-D point is represented as a directed graph in SPC. It is shown that the FSP method simplifies pattern discovery in n-D data providing explainable rules in a visual form with significantly decrease of the cognitive load for analysis of n-D data. The computational experiments on …
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Complexity of Dyck-reachability in directed graphs
We study the problem of Dyck-reachability in directed graphs de ned as follows: given a directed graph with edges labeled by either open or close parentheses, we claim that a vertex is Dyck-reachable from another if there is a path between these two vertices such that the string described by …
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Aspects of inference for the Influence Model and related graphical models
… in a variety of contexts. It consists of a directed graph of interacting sites whose Markov state transition probabilities depend on their present state and that of their neighbors. The major goals of this thesis are (1) to place the Influence Model in the broader framework of graphical …
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Visualization of Student Cohort Data With Sankey Diagrams via Web-Centric Technologies
… a student cohort is represented as a weighted, directed, graph, where a vertex represents a distinct class status for a semester and each weighted edge represents the number of students moving between class statuses. To ease understanding, this graph is represented visually as a Sankey Diagram, …
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Controllability and Observability of a Large Scale Thermodynamical System via Connectability Approach
… scale nonlinear dynamic thermal system using graph-theory. The novelty of this method is in adapting graph theory for nonlinear class and establishing a graphic condition that describes the necessary and sufficient terms for a nonlinear class system to be controllable and observable, which …
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