Browsing Mathematics (Faculty of) by Title
Now showing items 1838-1857 of 2994
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Numerical Stability in Linear Programming and Semidefinite Programming
(University of Waterloo, 2006)We study numerical stability for interior-point methods applied to Linear Programming, LP, and Semidefinite Programming, SDP. We analyze the difficulties inherent in current methods and present robust algorithms. ... -
Numerical Study of a Viscoelastic Model for Hydrocephalus
(University of Waterloo, 2006)Hydrocephalus is a clinical conditon where the brain tissue is deformed by the expanding ventricules. In this thesis, the mechanical deformation of a hydrocephalic brain is studied using a biomechanical model, where the ... -
Nymbler: Privacy-enhanced Protection from Abuses of Anonymity
(University of Waterloo, 2011-01-05)Anonymous communications networks help to solve the real and important problem of enabling users to communicate privately over the Internet. However, by doing so, they also introduce an entirely new problem: How can service ... -
The O'Nan-Scott Theorem for Finite Primitive Permutation Groups, and Finite Representability
(University of Waterloo, 2009-08-06)The O'Nan-Scott Theorem classifies finite primitive permutation groups into one of five isomorphism classes. This theorem is very useful for answering questions about finite permutation groups since four out of the five ... -
Obedience-based Multi-Agent Cooperation for Sequential Social Dilemmas
(University of Waterloo, 2020-05-14)We propose a mechanism for achieving cooperation and communication in Multi-Agent Reinforcement Learning (MARL) settings by intrinsically rewarding agents for obeying the commands of other agents. At every timestep, agents ... -
Occlusion-Ordered Semantic Instance Segmentation
(University of Waterloo, 2023-08-23)Conventional semantic ‘instance’ segmentation methods offer a segmentation mask for each object instance in an image along with its semantic class label. These methods excel in distinguishing instances, whether they belong ... -
OFF-DIAGONAL CORNERS OF SUBALGEBRAS OF L(Cn)
(Elsevier, 2020-12-15)Let n ∈ N, and consider Cn equipped with the standard inner product. Let A ⊆ L(Cn) be a unital algebra and P ∈ L(Cn) be an orthogonal projection. The space L := P ⊥A|ran P is said to be an off-diagonal corner of A, and L ... -
Offline Evaluation via Human Preference Judgments: A Dueling Bandits Problem
(University of Waterloo, 2022-11-22)The dramatic improvements in core information retrieval tasks engendered by neural rankers create a need for novel evaluation methods. If every ranker returns highly relevant items in the top ranks, it becomes difficult ... -
Offset Surface Light Fields
(University of Waterloo, 2003)For producing realistic images, reflection is an important visual effect. Reflections of the environment are important not only for highly reflective objects, such as mirrors, but also for more common objects such as ... -
On 2-crossing-critical graphs with a V8-minor
(University of Waterloo, 2014-05-22)The crossing number of a graph is the minimum number of pairwise edge crossings in a drawing of a graph. A graph $G$ is $k$-crossing-critical if it has crossing number at least $k$, and any subgraph of $G$ has crossing ... -
On a 2-class polling model with reneging and ki -limited service
(Springer, 2018-06-18)This paper analyzes a 2-class, single-server polling model operating under a ki-limited service discipline with class-dependent switchover times. Arrivals to each class are assumed to follow a Poisson process with phase-type ... -
On a general mixed priority queue with server discretion
(Taylor & Francis, 2016-10-01)We consider a single-server queueing system which attends to N priority classes that are classified into two distinct types: (i) urgent: classes which have preemptive resume priority over at least one lower priority class, ... -
On a Question of Wintner Concerning the Sequence of Integers Composed of Primes from a Given Set
(University of Waterloo, 2007-09-27)We answer to a Wintner's question concerning the sequence of integers composed of primes from a given set. The results generalize and develop the answer to Wintner’s question due to Tijdeman. -
On Achieving High Survivability in Virtualized Data Centers
(Institute of Electronics, Information and Communication Engineers, 2014-01-01)As businesses are increasingly relying on the cloud to host their services, cloud providers are striving to offer guaranteed and highly-available resources. To achieve this goal, recent proposals have advocated to offer ... -
On Aharoni’s rainbow generalization of the Caccetta–Häggkvist conjecture
(Elsevier, 2021-05-01)For a digraph G and v is an element of V(G), let delta(+)(v) be the number of out-neighbors of v in G. The Caccetta-Haggkvist conjecture states that for all k >= 1, if G is a digraph with n = |V(G)| such that delta(+)(v) ... -
On Algorithms, Separability and Cellular Automata in Quantum Computing
(University of Waterloo, 2007-09-26)In Part I of this thesis, we present a new model of quantum cellular automata (QCA) based on local unitary operations. We will describe a set of desirable properties for any QCA model, and show that all of these properties ... -
On Amenability Properties and Coideals of Quantum Groups
(University of Waterloo, 2022-07-27)We study amenability type properties of locally compact quantum groups and subobjects of quantum groups realized as submodules of their von Neumann algebras. An important class of such subobjects are the coideals, which ... -
On Asynchronous Interference Channels
(University of Waterloo, 2016-11-15)In the first part of the thesis, a decentralized wireless network of separate transmitter-receiver pairs is studied where there is no central controller to assign the resources to the users and users do not explicitly ... -
On coloring digraphs with forbidden induced subgraphs
(University of Waterloo, 2023-04-25)This thesis mainly focuses on the structural properties of digraphs with high dichromatic number. The dichromatic number of a digraph $D$, denoted by $\dichi(D)$, is designed to be the directed analog of the chromatic ... -
On Combinatorics, Integrability and Puzzles
(University of Waterloo, 2020-10-23)In the last decade, many old and new results in combinatorics have been shown using the theory of quantum integrable systems from particle physics. The key to solving such problems is the derivation of an underlying ...