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Tesi sul tema "Trees"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Okoth, Isaac Owino. "Combinatorics of oriented trees and tree-like structures." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/96860.

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Thesis (PhD)--Stellenbosch University, 2015.<br>ENGLISH ABSTRACT : In this thesis, a number of combinatorial objects are enumerated. Du and Yin as well as Shin and Zeng (by a different approach) proved an elegant formula for the number of labelled trees with respect to a given in degree sequence, where each edge is oriented from a vertex of lower label towards a vertex of higher label. We refine their result to also take the number of sources (vertices of in degree 0) or sinks (vertices of out degree 0) into account. We find formulas for the mean and variance of the number of sinks or s

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2

Drinkwater, Kara M. "Trees." VCU Scholars Compass, 2006. http://hdl.handle.net/10156/1907.

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3

Garton, Ian Spencer. "Concurrency in B-trees and tries : search and insert." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=33400.

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Multiuser database systems require concurrency control in order to perform correctly. B-trees have become the standard data structure for storing indices that aid in data retrieval and there have been many algorithms published to enable concurrent operations for B-trees. Tries are another data structure useful for storing index data, particularly for text and spatial databases. Significant data compression can be achieved by using a trie to store index values. However, there have been no algorithms published to support concurrent trie operations.<br>We present algorithms that enable concurrent

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4

Hall, Justine Michelle. "Trees in towns : factors affecting the distribution of trees in high density residential areas of Greater Manchester." Thesis, University of Manchester, 2010. https://www.research.manchester.ac.uk/portal/en/theses/trees-in-towns-factors-affecting-the-distribution-of-trees-in-high-density-residential-areas-of-greater-manchester(568b58f3-4524-4a8d-abba-2094c4e21567).html.

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The distribution of trees across urban areas of the UK has been shown to be uneven, with lower density residential areas containing many more trees and much higher tree cover than areas of higher density housing. However, in Greater Manchester, tree number within high density housing areas also varies substantially. This thesis sought to explore the reasons for this variation in tree cover, whether tree cover should be increased and if so, how. The research investigated a potential cause for the variation in number of trees and tree cover within high density housing areas – housing type – for

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5

Abu-Ata, Muad Mustafa. "Tree-Like Structure in Graphs and Embedability to Trees." Kent State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=kent1397345185.

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6

Bryant, David. "Building trees, hunting for trees, and comparing trees : theory and methods in phylogenetic analysis." Thesis, University of Canterbury. Mathematics and Statistics, 1997. http://hdl.handle.net/10092/7914.

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Phylogenetics is the study and identification of evolutionary patterns and structures in nature; this thesis explores the mathematics of these structures. The basic objects of study are the leaf labelled tree and its substructures: quartets, splits, clusters and rooted triples, among others. We present fundamental theorems and characterisations, as well as efficient algorithms for a range of phylogenetic problems. It is often possible to deduce phylogenetic information not in the original data. We characterise an intriguing system of inference 'rules' that arise in this way, and prove that th

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7

Balakrishnan, Anantaram, Thomas L. Magnanti, and Prakash Mirchandani. "Heuristics, LPs, and Generalizations of Trees on Trees." Massachusetts Institute of Technology, Operations Research Center, 1993. http://hdl.handle.net/1721.1/5377.

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We study a class of models, known as overlay optimization problems, with a "base" subproblem and an "overlay" subproblem, linked by the requirement that the overlay solution be contained in the base solution. In some telecommunication settings, a feasible base solution is a spanning tree and the overlay solution is an embedded Steiner tree (or an embedded path). For the general overlay optimization problem, we describe a heuristic solution procedure that selects the better of two feasible solutions obtained by independently solving the base and overlay subproblems, and establish worst-case per

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8

Magnanti, Thomas L., and Laurence A. Wolsey. "Optimal Trees." Massachusetts Institute of Technology, Operations Research Center, 1994. http://hdl.handle.net/1721.1/5122.

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9

Prosser, Christopher Skinner 1978. "Two Trees." Thesis, University of Oregon, 2010. http://hdl.handle.net/1794/11048.

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1 score (viii, 79 p.) A print copy of this thesis is available through the UO Libraries. Search the library catalog for the location and call number.<br>The Two Trees is a fifteen-minute musical composition for orchestra. Inspired by William Butler Yeats' poem of the same name, the piece depicts the images described by Yeats' poetic narrative through a double theme and variations form consisting of two contrasting themes that are related, one ascending and one descending. Each theme represents one of the two contrasting sections of the poem and is followed by a set of five variations f

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10

Taylor, Paul Clifford. "Classification trees." Thesis, University of Bath, 1990. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.306312.

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11

Balakrishnan, Anantaram, Thomas L. Magnanti, and Prakash Mirchandani. "Heuristics, LPs, and Trees on Trees: Network Design Analyses." Massachusetts Institute of Technology, Operations Research Center, 1994. http://hdl.handle.net/1721.1/5277.

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Abstract (sommario):

We study a class of models, known as overlay optimization problems, with a "base" subproblem and an "overlay" subproblem, linked by the requirement that the overlay solution be contained in the base solution. In some telecommunication settings, a feasible base solution is a spanning tree and the overlay solution is an embedded Steiner tree (or an embedded path). For the general overlay optimization problem, we describe a heuristic solution procedure that selects the better of two feasible solutions obtained by independently solving the base and overlay subproblems, and establish worst-case per

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12

Choi, Myung Jin Ph D. Massachusetts Institute of Technology. "Trees and beyond : exploiting and improving tree-structured graphical models." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/62888.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2011.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student submitted PDF version of thesis.<br>Includes bibliographical references (p. 169-179).<br>Probabilistic models commonly assume that variables are independent of each other conditioned on a subset of other variables. Graphical models provide a powerful framework for encoding such conditional independence stru

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13

Skorin-Kapov, Darko. "On some problems on k-trees and partial k-trees." Thesis, University of British Columbia, 1989. http://hdl.handle.net/2429/29288.

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The objective of this thesis is to investigate some structural and algorithmic properties of k-trees and partial k-trees. A k-tree can be constructed from a k-complete graph by recursively adding a new vertex which is adjacent to all vertices of an existing k-complete subgraph. Partial k-trees are graphs embeddable in a k-tree with the same vertex set. They are natural generalizations of forests and series-parallel graphs which are the first two members of the hierarchy of partial k-trees. The many applications of k-trees and partial k-trees have motivated their study from both an algorithmic

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14

Travis, David J., Vernon Meentemeyer, and Roger P. Belanger. "Stressed Trees Produce a Better Climatic Signal than Healthy Trees." Tree-Ring Society, 1990. http://hdl.handle.net/10150/261930.

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The basis for the selection of trees to be used in the production of dendrochronologies has long been an issue (Douglass 1946; Fritts 1976). In humid regions the common practice has been to use trees that appear to be in good health. As a part of a larger study involving the impact of ice storms on tree-ring increments (Travis 1989), we show that trees stressed as a result of ice damage produced a stronger climatic signal than nondamaged trees.

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15

Kirkby, Richard Brendon. "Improving Hoeffding Trees." The University of Waikato, 2008. http://hdl.handle.net/10289/2568.

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Modern information technology allows information to be collected at a far greater rate than ever before. So fast, in fact, that the main problem is making sense of it all. Machine learning offers promise of a solution, but the field mainly focusses on achieving high accuracy when data supply is limited. While this has created sophisticated classification algorithms, many do not cope with increasing data set sizes. When the data set sizes get to a point where they could be considered to represent a continuous supply, or data stream, then incremental classification algorithms are required. In th

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16

Clark, David. "Compact PAT trees." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq21335.pdf.

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17

Kustra, Rafal. "Soft decision trees." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq28745.pdf.

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18

Kutscheid, Gloria J. "More than trees." Virtual Press, 1986. http://liblink.bsu.edu/uhtbin/catkey/473196.

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The purpose of this study was to complete a series of photographs utilizing trees as metaphors. This series of photographs is composed into book form for possible publication. It presents the psychological and symbolic impact of trees in different environments and from different perspectives through the development of a unique style of creative composition. The format consists of text and photographs. This project develops a working definition of metaphors and an approach using trees as the medium to convey various symbolic and psychological references. Both associated and inferred types of sy

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19

Puch-Solis, Roberto O. "Hierarchical junction trees." Thesis, University of Warwick, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365243.

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20

Della-Libera, Giovanni M. (Giovanni Moises). "Dynamic diffracting trees." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/40614.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.<br>Includes bibliographical references (p. 109-111).<br>by Giovanni M. Della-Libera.<br>M.Eng.

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21

Woznica, Hilary. "Hearts and Trees." VCU Scholars Compass, 2012. http://scholarscompass.vcu.edu/etd/306.

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The process of creating art is a visceral experience for me. Each piece is born from an inherent need to visually express and understand my experiences and emotions. I use a variety of materials to create mixed media sculptures, books, and two-dimensional images. Maps and trees are the common motifs and metaphors found in my work. I paint on the surface of maps to reference significant locations in my journey of personal growth. I incorporate found sticks and branches in my sculptures and paint images of trees to communicate my reverence for nature. I often use the tree as a symbol for m

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22

Wright, Glenn C. "Irrigating Citrus Trees." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2000. http://hdl.handle.net/10150/144778.

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5 pp.<br>Water is essential for citrus trees because it is an integral component of the biochemical reactions that occur within the plant, and also because it is the carrier that moves plant nutrients and other substances throughout the tree. This publication examines irrigating citrus trees. Topics include; water stress, estimating tree water use, timing water applications, dealing with salty water, calculating how much water is applied, as well as application methods and mulches. And it also includes a table which can be applied to spreadsheets, to calculate the exact amount of water a citru

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23

Wright, Glenn C. "Budding Citrus Trees." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2000. http://hdl.handle.net/10150/144814.

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3 pp.<br>Citrus budding is a plant propagation technique that any homeowner can do. Once the technique is learned, homeowners can add citrus tree. This publication addresses the budding techniques of citrus trees. Topics include the preparation prior to budding, selecting budsticks, storing budsticks, selecting and preparing the budding location, cutting the bud, inserting the bud in the t cut, and forcing the bud.

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24

Dawson, Shelly Jean. "Minimal congestion trees." CSUSB ScholarWorks, 2006. https://scholarworks.lib.csusb.edu/etd-project/3005.

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Analyzes the results of M.I. Ostrovskii's theorem of inequalities which estimate the minimal edge congestion for finite simple graphs. Uses the generic results of the theorem to examine and further reduce the parameters of inequalities for specific families of graphs, particularly complete graphs and complete bipartite graphs. Also, explores a possible minimal congestion tree for some grids while forming a conjecture for all grids.

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25

Goudjil, Amar. "Data structures, binary search trees, a study of random Weyl trees." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape7/PQDD_0026/MQ50778.pdf.

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26

Goudjil, Amar. "Data structures, binary search trees : a study of random Weyl trees." Thesis, McGill University, 1998. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=21559.

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This thesis covers the study of a particular class of binary search trees, the Weyl trees formed by consecutive insertion of numbers {theta}, {2theta}, {3theta}, ..., where theta is an irrational number from (0,1), and {x} denotes the fractional part of x. Various properties of the structure of these trees are explored and a relationship with the continued fraction expansion of theta is shown. Among these properties, an approximation of the height Hn of a Weyl tree with n nodes is given when theta is chosen at random and uniformly on (0, 1). The main result of this work is that in probability,

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27

Holmgren, Cecilia. "Split Trees, Cuttings and Explosions." Doctoral thesis, Uppsala universitet, Matematiska institutionen, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-112239.

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This thesis is based on four papers investigating properties of split trees and also introducing new methods for studying such trees. Split trees comprise a large class of random trees of logarithmic height and include e.g., binary search trees, m-ary search trees, quadtrees, median of (2k+1)-trees, simplex trees, tries and digital search trees. Split trees are constructed recursively, using “split vectors”, to distribute n “balls” to the vertices/nodes. The vertices of a split tree may contain different numbers of balls; in computer science applications these balls often represent “key number

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28

Kittle, T. Rene. "Influence of mycorrhizal inoculation treatments on native tree and shrub biomass and survival in a floodplain, Flathead Indian Reservation." CONNECT TO THIS TITLE ONLINE, 2007. http://etd.lib.umt.edu/theses/available/etd-06042007-104842/.

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29

Rathfon, Ronald A. "Developing DRIS norms for Fraser fir Christmas trees." Thesis, Virginia Tech, 1990. http://hdl.handle.net/10919/41610.

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Fraser fir [Abies fraseri (Pursh) Poir.] is an important Christmas tree species in Virginia. Because it is responsive to fertilization, and because most Fraser fir growers fertilize their crop, a scientifically-based nutrient diagnosis and fertilizer recommendation system is needed. The objective of this study was to develop and test DRIS norms for Fraser fir Christmas trees grown in Virginia for the ultimate purpose of establishing a nutrition diagnosis and fertilizer prescription system. A total of 107 Fraser fir plantations were sampled for foliage, soil, and diameter measurements. These pl

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30

Riitters, Kurt H. "Analysis of Biweight Site Chronologies: Relative Weights of Individual Trees over Time." Tree-Ring Society, 1990. http://hdl.handle.net/10150/261911.

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The relative weights on individual trees in a biweight site chronology can indicate the consistency of tree growth responses to macroclimate and can be the basis for stratifying trees in climate-growth analyses. This was explored with 45 years of ring-width indices for 200 trees from five even-aged jack pine (Pints banksiana Lamb.) stands. Average individual-tree relative weights were similar, but most trees had at least one transient occurrence of low relative weight. The standard deviations of individual-tree relative weights suggested that some trees had mom variable growth responses than o

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31

Biondi, Franco. "Development of a Tree-Ring Network for the Italian Peninsula." Tree-Ring Society, 1992. http://hdl.handle.net/10150/262358.

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This article describes the analysis of tree-ring collections from standing trees of sixteen species at twenty sites distributed throughout the Italian Peninsula. Visual and numerical crossdating among ring widths allowed the computation of standard and residual tree-ring chronologies. Relationships among chronologies were identified by Spearman's coefficient of rank correlation, using Bonferroni's inequality to adjust significance level. The oldest living tree sampled to date is a 963-year old palebark pine (Pinus leucodermis Ant.) at Parco del Pollino. Individuals more than two centuries old

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32

Grissino-Mayer, Henri D. "An Updated List of Species Used in Tree-Ring Research." Tree-Ring Society, 1993. http://hdl.handle.net/10150/262378.

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During the past 100 years, researchers have investigated the potential of hundreds of tree and shrub species for use in applications of tree-ring research. Although several lists of species known to crossdate have been published, investigated species that do not crossdate are rarely included despite the usefulness of this information for future research. This paper provides a list of the Latin and common names of 573 species that have been investigated in tree-ring research, information on species known to crossdate, and information on species with measurement and/or chronology data in the Int

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33

Thia, Joshua A. Y. W. "The plight of trees in disturbed forest: conservation of Montane Trees, Nigeria." Thesis, University of Canterbury. School of Biological Sciences, 2014. http://hdl.handle.net/10092/9887.

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The montane forests of Africa represent some of the Earth's most diverse and threatened ecosystems. In particular, those in West Africa have received comparatively little attention from scientists in terms of understanding the ecology and biodiversity of their species. This thesis wishes to understand genetic and ecological factors that underpin the long-term survival of selected tree species (Cordia millenii, Entandrophragma angolense, Lovoa trichilioides) in the montane forests of the Mambilla Plateau, Nigeria. The results obtained here provide a strong foundation for future work that wishes

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34

Tadros, Alexandre. "Topological recursive fitting trees : A framework for interpretable regression extending decision trees." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-272130.

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Many real-world machine learning applications need interpretation of an algorithm output. The simplicity of some of the most fundamental machine learning algorithms for regression, such as linear regression or decision trees, facilitates interpretation. However, they fall short when facing complex (e.g. high-dimensional, nonlinear) relationships between variables. Several approaches like artificial neural networks and bagging or boosting variants of decision trees have been able to overcome this issue but at the cost of interpretation. We propose a framework called Topological Recursive Fittin

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35

Yao, Chu. "Quad general tree drawing algorithm and general trees characterization : towards an environment for the experimental study on general tree drawing algorithms /." Full text available online, 2008. http://www.lib.rowan.edu/find/theses.

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36

MacKinnon, Richard Kyle. "Seeing the forest for the trees: tree-based uncertain frequent pattern mining." Springer International Publishing, 2014. http://hdl.handle.net/1993/31059.

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Many frequent pattern mining algorithms operate on precise data, where each data point is an exact accounting of a phenomena (e.g., I have exactly two sisters). Alas, reasoning this way is a simplification for many real world observations. Measurements, predictions, environmental factors, human error, &ct. all introduce a degree of uncertainty into the mix. Tree-based frequent pattern mining algorithms such as FP-growth are particularly efficient due to their compact in-memory representations of the input database, but their uncertain extensions can require many more tree nodes. I propose new

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37

Horton, M. "Graceful Trees: Statistics and Algorithms." Thesis, Honours thesis, University of Tasmania, 2003. https://eprints.utas.edu.au/19/1/GracefulTreesStatisticsAndAlgorithms.pdf.

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The Graceful Tree Conjecture is a problem in graph theory that dates back to 1967. It suggests that every tree on n nodes can be labelled with the integers [1..n] such that the edges, when labelled with the difference between their endpoint node labels, are uniquely labelled with the integers [1..n-1]. To date, no proof or disproof of the conjecture has been found, but all trees with up to 28 vertices have been shown to be graceful. The conjecture also leads to a problem in algorithm design for efficiently finding graceful labellings for trees. In this thesis, a new graceful labelling algo

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Kühn, Daniela. "Cycles, minors and trees." [S.l.] : [s.n.], 2001. http://www.sub.uni-hamburg.de/disse/511/kuehn.pdf.

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König, Bernhard. "Trees, games and reflections." [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=964459620.

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Strothmann, Willy-B. "Bounded degree spanning trees /." Paderborn : HNI, 1997. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=007959737&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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König, Bernhard Andreas. "Trees, Games and Reflections." Diss., lmu, 2002. http://nbn-resolving.de/urn:nbn:de:bvb:19-81.

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Brumpton, Aaron M. W. "Molecules, trees, and guillotines." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ28178.pdf.

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43

Zamora, Cura Carlos Alberto. "Analysis of random trees." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0032/NQ64705.pdf.

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44

Cole, July Oskar. "Red Trees and Why." The University of Montana, 2010. http://etd.lib.umt.edu/theses/available/etd-06032010-203108/.

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45

Zhao, Rongyao. "Placements of euclidean trees." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=74356.

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We define a Euclidean tree T = $(V,E)$ to be a weighted tree such that each edge $e in E$ has been assigned a positive integer weight l(e) called the length of e. A placement of T = $(V,E)$ is an assignment $f: V to { bf R} sp2$ (or R$ sp3$) of vertices to points in space satisfying the following: for each edge $e = (u,v) in E$, the Euclidean distance between f(u) and f(v) is equal to l(e). We define the EUCLIDEAN TREE PLACEMENT problem as follows. Given a Euclidean tree T = (V,E) and a subset of m vertices in V labeled $u sb1,u sb2, cdots,u sb{m}$, and given m nonempty sets $S sb1,S sb2, cdot

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46

Collins, Karen L. (Karen Linda). "Distance matrices of trees." Thesis, Massachusetts Institute of Technology, 1986. http://hdl.handle.net/1721.1/77687.

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47

Pardi, Fabio. "Algorithms on phylogenetic trees." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611685.

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48

Razanajatovo, Misanantenaina Valisoa. "Properties of greedy trees." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/95909.

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Thesis (MSc)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: A greedy tree is constructed from a given degree sequence using a simple greedy algorithm that assigns the highest degree to the root, the second, the third, . . . , -highest degree to the root’s neighbours, etc. This particular tree is the solution to numerous extremal problems among all trees with given degree sequence. In this thesis, we collect results for some distancebased graph invariants, the number of subtrees and the spectral radius in which greedy trees play a major role. We show that greedy trees are extremal

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49

Riveros, Jaeger Cristian. "Repairing strings and trees." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:012d384f-d1d0-471b-ae6e-bbf337892680.

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What do you do if a computational object fails a specification? An obvious approach is to repair it, namely, to modify the object minimally to get something that satisfies the constraints. In this thesis we study foundational problems of repairing regular specifications over strings and trees. Given two regular specifications R and T we aim to understand how difficult it is to transform an object satisfying R into an object satisfying T. The setting is motivated by considering R to be a restriction -- a constraint that the input object is guaranteed to satisfy -- while T is a target -- a const

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Kemerling, Robert Alan. "Controlling with Model Trees." NSUWorks, 2011. http://nsuworks.nova.edu/gscis_etd/193.

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Abstract (sommario):

This dissertation develops a method of control for nonlinear processes based on regression trees with kernel regression at the leaves as a general control methodology. This methodology offers the ability to control a wide variety of processes exhibiting nonlinear behavior. It takes a place with other machine learning methods that are being applied to nonlinear control, but it does not suffer from the shortcomings of other methods. The method draws on two well-known machine learning methods, regression trees and kernel regression. This dissertation shows that this control method may be programm

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