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 20 for “"Re-optimization"”.
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Constructing Accurate Synopses for Database Query Optimization and Re-optimization
… and accurate estimations for complex queries are profoundly beneficial for large databases with heavy workloads. The most widely adopted query optimizers use synopses to tune up the databases in manners of optimization and re-optimization. From Chapter 1 to Chapter 3, we focus on the synopses …
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Dynamic re-optimization techniques for stream processing engines and object stores
… scale data storage and processing systems are strongly motivated by the need to store and analyze massive datasets. The complexity of a large class of these systems is rooted in their distributed nature, extreme scale, need for real-time response, and streaming nature. The use of these …
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Dynamic airline scheduling and robust airline schedule de-peaking
… many flights have empty seats at departure, while others suffer a lack of seats to accommodate passengers who desire to travel. Recognizing that demand forecast quality for a particular departure date improves as the date comes close, we tackle this challenge by developing a dynamic …
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Incremental Processing and Optimization of Update Streams
Over the recent years, we have seen an increasing number of applications in networking, sensor networks, cloud computing, and environmental monitoring, which monitor, plan, control, and make decisions over data streams from multiple sources. We are interested in extending traditional stream …
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Robust Updated MPC Schemes
We consider model predictive control (MPC) approaches to approximate the solution of infinite horizon optimal control problems (OCPs) for perturbed nonlinear discrete time systems. MPC provides an algorithmic synthesis of an approximately optimal feedback law by iteratively solving finite horizon …
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Real-time Multi-period truckload routing problems
… pick-up and delivery problem dealing with real-time requests over a finite time horizon. We introduce the notion of postponement of requests, whereby the company can postpone some requests to the next day in order to improve its operational efficiency. The postponed requests must then be …
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Modeling and algorithms for optimizing beam steering optical crossconnects
… through each possible input/output pair. The result from the fine-tuning process that produces optimization at one point in time, however, does not guarantee optimization for future attempts. This thesis models the transmissivity as a function of control variables in the vicinity of an optimal …
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Exploiting on-chip memory concurrency in 3d manycore architectures
… objective of this thesis is to optimize the uncore of 3D many-core architectures. More specifically, we note that technology trends point to large increases in memory-level concurrency. This in turn affects the design of the multi-core interconnect and organization of the memory hierarchy. The …
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Development of a decision framework and a knowledge management system for make/buy determinations in manufacturing
… decisions for final products and specifically addresses the Make/Buy issue. Background information describes the steps undertaken to develop this process, including a summary of best practice information. The process has three main elements that are described in detail: ** A strategic management …
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Approximate dynamic programming solutions with a single network adaptive critic for a class of nonlinear systems
… Critic (AC) based neural network (NN) structure has evolved as a powerful technique for solving the Hamilton-Jacobi-Bellman (HJB) equations. As interest in ADP and the AC solutions are escalating with time, there is a dire need to consider possible enabling factors for their implementations. A …
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What's on the table : revenue management and the welfare gap In the US airline industry
This thesis explores the potential improvements in Revenue Management from two distinct perspectives. The first piece of work is to explore the potential operational improvements, in which we aim to develop competitive and robust dynamic pricing rules in a market whose evolution can be highly …
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An investigation of perturbation-based balance training as a fall prevention intervention for older adults
Approximately one in three adults 65 years and older fall each year and these falls lead to a substantial number of serious injuries and deaths. Numerous interventions have been proposed for fall-prevention but the efficacy can vary, and may be due to the general nature of the interventions. Older …
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The Development of Artificial Intelligence-Based to ols For Expert Peer Review of Radiotherapy Treatment Plans
<p>Creating a patient-specific radiation treatment plan is a time-consuming and operator-dependent manual process. The treatment planner adjusts the planning parameters in a trial-and-error fashion in an effort to balance the competing clinical objectives of tumor coverage and normal tissue …
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Adaptive Radiation Therapy Of Prostate Cancer
… the organ deformation and motion right before the treatment and takes into account dose delivery variation daily to compensate for the difference between planned and delivered dose. It also has potential to allow further dose escalation and margin reduction to improve the clinical outcome. …
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Small-scale and flexible green ammonia production technology
Ammonia has been responsible for feeding population growth in the 20th century through synthetic fertilizer, and is poised to become the preferred energy storage medium for a society powered by renewable electricity in the 21st century. However, conventional brown ammonia production through the …
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Artificial Intelligence (AI)-assisted Cardiotoxicity Management in Lung Cancer Radiotherapy
<p>Lung cancer remains one of the leading causes of cancer-related mortality worldwide, with radiation therapy being a cornerstone of treatment. However, radiation-induced cardiotoxicity has emerged as a significant long-term complication, impacting patient survival and quality of life. There is …
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Optimizing The Performance Of As-manufactured Grazing Incidence X-ray Telescopes Using Mosaic Detector Arrays
… observatory, HEAO-1 was launched in 1977, a mere twenty-eight (28) years ago. Since that time large nested Wolter Type I X-ray telescopes have been designed, build, and launched by the European Space Agency (ROSAT) and NASA (the Chandra Observatory). Several smaller grazing incidence telescopes …
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Essays in Urban and Spatial Economics
My thesis consists of three chapters on how infrastructure and regulation shape urban and spatial outcomes. While rather different in terms of the specific topic, they share at least three common themes. First, all chapters are policy-oriented and speak to currently urgent issues. Second, they …
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Optimization Models Addressing Emergency Management Decisions During a Mass Casualty Incident Response
Emergency managers are often faced with the toughest decisions that can ever be made, people's lives hang in the balance. Nevertheless, these tough decisions have to be made, and made quickly. There is usually too much information to process to make the best decisions. Decision support systems can …
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Adaptive Intensity Modulated Radiation Therapy Planning Optimization with Changing Tumor Geometry and Biology Enforcing Both Cumulative and Fraction Size Dose Constraints
… is a modern technique of delivering radiation treatments to cancer patients. In IMRT technology, intensities must be chosen for the many small unit grids into which the beams are divided to produce a desired distribution of dose at points throughout the body with the goal of maximizing dose …