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 31 for “"Hamilton Institute"”.
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Decentralised Algorithms for Wireless Networks.
Designing and managing wireless networks is challenging for many reasons. Two of the most crucial in 802.11 wireless networks are: (a) variable per-user channel quality and (b) unplanned, ad-hoc deployment of the Access Points (APs). Regarding (a), a typical consequence is the selection, for each …
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A Fast Minimal Infrequent Itemset Mining Algorithm
A novel fast algorithm for finding quasi identifiers in large datasets is presented. Performance measurements on a broad range of datasets demonstrate substantial reductions in run-time relative to the state of the art and the scalability of the algorithm to realistically-sized datasets up to …
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New Perspectives on Modelling and Control for Next Generation Intelligent Transport Systems
This PhD thesis contains 3 major application areas all within an Intelligent Transportation System context. The first problem we discuss considers models that make beneficial use of the large amounts of data generated in the context of traffic systems. We use a Markov chain model to do this, where …
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Information Diffusion on Social Networks
In this thesis we model the diffusion of information on social networks. A game played on a specific type of graph generator, the iterated local transitivity model, is examined. We study how the dynamics of the game change as the graph grows, and the relationship between properties of the game on a …
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Distributed Energy-Saving Algorithms for Wireless Networks
The rapid growth of wireless networks has led to increasing interest in designing new algorithms that can efficiently reduce the energy consumption of routers and other devices. We present a new formulation of the Network Flow problem that takes into account the energy consumption of the data …
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Humanoid Robot Soccer Locomotion and Kick Dynamics: Open Loop Walking, Kicking and Morphing into Special Motions on the Nao Robot
Striker speed and accuracy in the RoboCup (SPL) international robot soccer league is becoming increasingly important as the level of play rises. Competition around the ball is now decided in a matter of seconds. Therefore, eliminating any wasted actions or motions is crucial when attempting to kick …
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A Combinatorial Approach to Nearly Uncoupled Markov Chains
A discrete-time Markov chain on a state space S is a sequence of random variables X = fx0; x1; : : :g that take on values in S. A Markov chain is a model of a system which changes or evolves over time; the random variable xt is the state of the system at time t. A subset E � S is referred to as an …
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Stability Analysis of Positive Systems with Applications to Epidemiology
In this thesis, we deal with stability of uncertain positive systems. Although in recent years much attention has been paid to positive systems in general, there are still many areas that are left untouched. One of these areas, is the stability analysis of positive systems under any form of …
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Stability results for constrained dynamical systems
Differential-Algebraic Equations (DAE) provide an appropriate framework to model and analyse dynamic systems with constraints. This framework facilitates modelling of the system behaviour through natural physical variables of the system, while preserving the topological constraints of the system. …
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Coding in 802.11 WLANs
Forward error correction (FEC) coding is widely used in communication systems to correct transmis- sion errors. In IEEE 802.11a/g transmitters, convolutional codes are used for FEC at the physical (PHY) layer. As is typical in wireless systems, only a limited choice of pre-speci¯ed coding rates is …
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Contributions to the Analysis of Biochemical Reaction-Diffusion Networks Stability, Analysis, and Numerical Solutions
In this thesis we address dynamic systems problems that arise from the study of biochemical networks. Here we prefer a rigorous treatment of the differential equations that govern their spatio-temporal dynamics, at the cost of studying simplified scenarios of the biological systems under study. …
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A Two-Dimensional Systems Stability Analysis of Vehicle Platoons
The main contributions of this dissertation are in the field of stability analysis of linear and nonlinear two-dimensional systems. The study of stability of such systems is motivated by the “string stability” or “platooning” problem: In order to achieve tighter spacing between vehicles travelling …
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Stability and Spectral Properties in the Max Algebra with Applications in Ranking Schemes
This thesis is concerned with the correspondence between the max algebra and non-negative linear algebra. It is motivated by the Perron-Frobenius theory as a powerful tool in ranking applications. Throughout the thesis, we consider max-algebraic versions of some standard results of non-negative …
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Pacemaking Neurons in the study of Parkinson’s Disease
Parkinson’s disease is the second most common neurodegenerative disorder with a signiVcant social cost. The disease that develops over years results in signiVcant movement related problems for the aUected. The pathogenesis however is partially understood. Computational approaches are signiVcant in …
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On Wireless Local Area Networks
Wireless Local Area Networks (WLANs) have been widely developed during this decade, due to their mobility and exibility. During this period, IEEE 802.11 has become the dominant WLAN protocol. This thesis reports on research into WLANs, especially IEEE 802.11 networks. Since IEEE 802.11 denes rules …
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Mathematical modelling of autophagy pathway.
A system modelling autophagy is a new area of research. Current understanding of each step in this biochemical pathway is limited. The study of this mechanism is interesting in several aspects: autophagy plays an important role in physiological cellular processes, is a survival mechanism under …
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Piecewise smooth systems and monotonicity.
In this thesis we study piecewise smooth and switched positive systems and investigate the monotonicity properties of such systems. We describe many examples of such systems, particulary drawing from the mathematical biology literature, in order to motivate the work in later chapters. We describe …
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Providing fairness and maximising throughput in 802.11 wireless mesh network.
The thesis addresses two questions: how to provide fairness in 802.11 wireless mesh networks and how to maximize the overall throughput in an distributed way. Fairness and efficiency are two fundamental issues in wireless networks, which are widely researched in both wired and wireless networks. We …
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Power evaluation and performance enhancement of CSMA/CA based WLANs.
Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) based Wireless Local Area Networks (WLANs) are becoming pervasive. As the most commonly employed standard in WLANs, IEEE 802.11 not only gives rise to health and safety concern from the general public, but also has the potential for …
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A control theoretic approach to mitigate viral escape in HIV
A very important scientific advance was the identification of HIV as a causative agent for AIDS. HIV infection typically involves three main stages: a primary acute infection, a long asymptomatic period and a final increase in viral load with a simultaneous collapse in healthy CD4+T cell count …
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