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 26 for “"Flow Optimization"”.
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Network flow optimization for distributed clouds
… This dissertation shows that network flow optimization can improve performance of distributed applications in the cloud by designing high-throughput schemes spanning all three layers. At the physical infrastructure layer, we devise a framework for measuring and understanding throughput …
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Patient flow optimization in the Department of Medicine at MGH
… This project studies General Medicine patient flow, develops and evaluates interventions to improve this flow, and provides recommendations to hospital leadership. To this end, we construct a discrete-event simulation based on historical data. Intervention effectiveness is measured primarily …
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Modeling of Distributed Naval Ship Systems using Architecture Flow Optimization
… they are logically connected to model the energy flow through a representative design and provide insight into sizing requirements of both system components and their connections using an Architecture Flow Optimization (AFO). This thesis presents a unique method and tool to optimize naval ship …
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Network-Based Naval Ship Distributed System Design using Architecture Flow Optimization
… system architecture framework and Architecture Flow Optimization (AFO) to naval ship Concept & Requirements Exploration (C&RE). It describes refinements to both C&RE and AFO, and naval surface combatant concept design case studies. The architectural framework decomposes naval ship distributed …
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Architecture Flow Optimization - Refinement and Application for Naval Ship Concept Design
… describes the refinement of an Architecture Flow Optimization (AFO) tool for naval surface ship design, specifically focusing on the development of new network and matrix-based methods for AFO formulation and their application in Concept Development. The AFO tool analyzes and optimizes the …
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Flow optimization of ventricular catheters for shear stress-induced death of astrocytes
… catheter geometries, we performed a numerical optimization based on a lumped-element model. We validated the lumped-element model against CFD simulations also in good agreement with the direct flow visualization we performed in the actual catheters. Apart from flow analysis, CSF was …
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Dynamic Architecture Flow Optimization for Capability-Based Assessment of Naval Ship Design
… and implementation of a Dynamic Architecture Flow Optimization (DAFO) tool for Combat, Power, and Energy System (CPES) design in naval surface ship concept development. As a continuation of earlier work, the DAFO has been refined using matrix-based methods with further development towards …
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Flow Optimization in Dynamic and Continuous Networks (Polymatroids, Submodular, Max-Flow Min-Cut)
… to be the destination, and a (tau)-maximum flow is defined to be a routing assignment which maximizes the amount of commodity reaching the destination before time (tau). The key discovery used to solve the problem is that a routing assignment has minimum delay if and only if it is a …
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Network-Based Naval Ship Distributed System Design and Mission Effectiveness using Dynamic Architecture Flow Optimization
… system architectural framework, Architecture Flow Optimization (AFO), and Dynamic Architecture Flow Optimization (DAFO) to naval ship Concept and Requirements Exploration (CandRE). The architectural framework decomposes naval ship distributed systems into physical, logical, and operational …
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Naval Ship Distributed System Design, Capability Modelling and Mission Effectiveness using a Dynamic Architecture Flow Optimization
… Capability Model (CM), and Dynamic Architecture Flow Optimization (DAFO). These models provide a critical interface between logical and operational architectures, quantifying warfighting capabilities through system measures of performance at specific capability nodes. These models' interface with …
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Development and Application of Dynamic Architecture Flow Optimization to Assess the Impact of Energy Storage on Naval Ship Mission Effectiveness, System Vulnerability and Recoverability
… system architecture framework, Architecture Flow Optimization (AFO), Dynamic Architecture Flow Optimization (DAFO), and Energy Storage System (ESS) model in naval ship Concept and Requirements Exploration (CandRE). The particular objective of this dissertation is to determine and assess …
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Sensitivity Calculations For Conservation Laws With Application To Discontinuous Fluid Flows
Flow sensitivities are the derivatives of the variables that describe the fluid flow with respect to the parameters that determine the fluid flow. Sensitivities are of interest in their own right and are also of use in flow optimization, control and design and in the calculation of perturbed flows. …
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Deactivation Diagram Development for Naval Ship System Vulnerability Analysis
… for rapid analysis of system connectivity and flow based on precomputed single-state system descriptions. This thesis explores the development of system deactivation diagrams and their use in early-stage naval ship system design. Software tools developed in C++ and VBA as part of this research …
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Accelerated algorithms for constrained optimization and control
Nonlinear optimization with equality and inequality constraints is a ubiquitous problem in several optimization and control problems in large-scale systems. Ensuring feasibility along with reasonable convergence to optimal solution remains an open and pressing problem in this area. A class of …
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Refinement of Surface Combatant Ship Synthesis Model for Network-Based System Design
… characteristics. Following an Architecture Flow Optimization (AFO), or energy flow analysis based on this framework, vital components are sized based on their energy flow requirements for application in the ship synthesis model (SSM). Previously, components were sized manually or …
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Low volume manufacturing strategies for the automotive industry : a global and emerging economy perspective
… of much research, this has largely focused on flow optimization, inventory reduction and logistics improvements. Less attention has been paid to the subject of process technology choices. Identifying and employing optimal processing technology for low volume applications can reduce costs …
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Collaborative direct to store distribution : the consumer packaged goods network of the future
… This thesis describes a modified minimum cost flow optimization model, which was developed to compare the costs of this multi-manufacturer collaborative distribution strategy with two more traditional distribution approaches in which each company would deliver product independently. The first …
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Models and algorithms for the optimization of traffic flows and emissions using dynamic routing and pricing
… and evaluation of models and algorithms for the optimization of traffic flows and emissions via routing and pricing in dynamic traffic networks. A set of problems that arise in this context are studied. These include: (1) the development of a probabilistic approach to model acceleration, (2) the …
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Optimizing empty container repositioning in a truck-rail intermodal network
… costs. A breadth of research exists for ECR optimization for intermodal ocean networks, but trucking industries operate cross-country and require a low-cost transcontinental solution. Intermodal railroad networks are the ideal ECR solution for trucking companies, but a lack of research exists …
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Scaling Bayesian optimization for engineering design : lookahead approaches and multifidelity dimension reduction
… Accordingly, whether the task is formal optimization or just design space exploration, there is often a finite budget specifying the maximum number of evaluations of the objectives and constraints allowed. Bayesian optimization (BO) has become a popular global optimization technique for …
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