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 18 of 18 for “"constraint-handling"”.
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Constraint handling rules. Compositional semantics and program transformation
This thesis intends to investigate two aspects of Constraint Handling Rules (CHR). It proposes a compositional semantics and a technique for program transformation. CHR is a concurrent committed-choice constraint logic programming language consisting of guarded rules, which transform multi-sets of …
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An engineering constraint handling and optimization system for integrated product development
… this research, the so-called ECHO (Engineering Constraint Handling and Optimization) system for integrated product development has been developed. A unique feature of this system is that it can explicitly represent and process both the upstream and downstream requirements. These requirements are …
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Model Predictive Control Structures in Non-Minimal State Space.
This thesis is concerned with constraint handling for systems described by a Non-Minimal State Space (NMSS) form. Such NMSS models are formulated directly from the measured input and output signals of the controlled process, without resort to the design and implementation of an observer. The thesis …
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Search Techniques for Evolutionary Constrained Optimization
… but they do not directly act to reduce constraint violations of constrained problems. Interestingly, the so called constraint handling techniques, used with most evolutionary algorithms, are not an integral part of the evolutionary search process. Instead, the constraint violations are …
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Predictive visual servoing; uncertainty analysis and probabilistic robust frameworks
… gained attention due to their optimal-ity and constraint-handling capabilities. However, their performance deteriorates in presence of uncertainties in the robotic platforms, system models, and measurements. This work proposes a set of robust image-based visual predictive control methods that …
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Constrained and High-dimensional Bayesian Optimization with Transformers
… algorithms that address critical limitations in handling constraints and high-dimensional spaces. First, we introduce a constraint-handling framework leveraging Prior-data Fitted Networks (PFNs), a foundation transformer model that evaluates objectives and constraints simultaneously in a single …
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SCHEDULING OF PAVEMENT MAINTENANCE ACTIVITIES
… to minimize traffic delays subject to the constraints of maintenance operational requirements. Two hypothetical problems to schedule the maintenance activities of an urban road network have been examined with this technique. In the first problem, 20 roads in a network have been scheduled …
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Differential Evolution for Dynamic Constrained Continuous Optimisation
… the first part of the thesis, we modify common constraint handling techniques from static domains to suit dynamic environments. We investigate the deficiencies of such techniques and the potential of each method based on the change characteristics of the environment. In the second part, we …
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Optimal management and operational control of urban sewer systems
… for a number of alternative formulations in constraint handling for the developed multi-objective optimization approach are compared. They produce interesting findings. Overall, the constraint handling formulations developed outside the genetic (NSGA II) algorithm provides better control in …
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Multiobjective genetic algorithms with application to control engineering problems.
… A unified approach to multiple objective and constraint handling with genetic algorithms is then developed from a decision making perspective and characterized, with application to control system design in mind. Related genetic algorithm issues, such as the ability to maintain diverse …
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Predictive control of urban wastewater systems
… treatment plant model, demonstrating the constraint handling ability of the predictive control structure. The limitations of an effluent-based control strategy in the maintenance of river quality is discussed. A more global approach to wastewater control must be considered in order to …
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Efficient Identification and Control Methods For Nonlinear Systems Under Uncertainty
… methods that address process nonlinearities and constraint handling capabilities under uncertainty. These methods are based on Moving Horizon Estimation (MHE), Nonlinear Model Predictive Control (NMPC), and Polynomial Chaos Theory (PCT).</p> <p>When implementing control on real multivariable …
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Spatial Optimization Techniques for School Redistricting
… of modification in the objective function and constraint-handling techniques. The source code and corresponding datasets are available at https://github.com/subhodipbiswas/schoolredistricting.
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Towards Efficient Hydraulic Manipulator Control using Learning-Based Model Predictive Control
… (MPC) have been explored for their foresight and constraint handling. Unfortunately, nonlinear Model Predictive Controllers pose a large computational burden, rendering these solutions infeasible for real-time applications. This work presents a learning-based MPC methodology incorporating …
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Expressiveness of Concurrent Languages
… fundamental role. We consider the language CHR (Constraint Handling Rules) a language which uses multi-headed (guarded) rules. We prove that multiple heads augment the expressive power of the language. Indeed we show that if we restrict to rules where the head contains at most n atoms we could …
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Real-time Forecasting and Control for Oscillating Wave Energy Devices
… physical meaning, for performance and motion constraint handling. The non-causality is removed by the parametrisation, the only input of the controller being an on-line estimate of the frequency and amplitude of the excitation force. Simulations in (synthetic and real) irregular waves …
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A penalty-free multi-objective evolutionary optimization approach for the design and rehabilitation of water distribution systems
… accounts for the node pressure constraints as well as the conservation of mass and energy. With accurate PDA, the direct application of the standard extended period simulation enables pump scheduling and tank sizing and siting to be seamlessly incorporated into the optimization …