Browsing Computation for Design and Optimization  Master's degree by Title
Now showing items 120 of 162

01 graph partitioning and image segmentation
(Massachusetts Institute of Technology, 2008)Graph partitioning is the grouping of all the nodes in a graph into two or more partitions based on certain criteria. Graph cut techniques are used to partition a graph. The Minimum Cut method gives imbalanced partitions. ... 
Adjoint sensitivity analysis of the intercontinental impacts of aviation emissions on air quality and health
(Massachusetts Institute of Technology, 2011)Over 10,000 premature mortalities per year globally are attributed to the exposure to particulate matter caused by aircraft emissions. Unlike previous studies that focus on the regional impacts from the aircraft emissions ... 
Algorithms for particle remeshing applied to smoothed particle hydrodynamics
(Massachusetts Institute of Technology, 2009)This thesis outlines adaptivity schemes for particlebased methods for the simulation of nearly incompressible fluid flows. As with the remeshing schemes used in mesh and gridbased methods, there is a need to use localized ... 
An analysis of scientific computing environments : a consumer's view
(Massachusetts Institute of Technology, 2008)In the last three decades, with rapid advancements in the hardware and software industry, a large number of commercial and free open source languages and software have evolved. Many of these are Very High Level Languages ... 
Analysis of the Projective ReNormalization method on semidefinite programming feasibility problems
(Massachusetts Institute of Technology, 2008)In this thesis, we study the Projective ReNormalization method (PRM) for semidefinite programming feasibility problems. To compute a good normalizer for PRM, we propose and study the advantages and disadvantages of a Hit ... 
An analysis of the TRBDF2 integration scheme
(Massachusetts Institute of Technology, 2007)We intend to try to better our understanding of how the combined Lstable 'Trapezoidal Rule with the second order Backward Difference Formula' (TRBDF2) integrator and the standard Astable Trapezoidal integrator perform ... 
An analysis on information diffusion by retweets in Twitter
(Massachusetts Institute of Technology, 2015)This dissertation examines retweeting activities as the information spreading function of Twitter. First, we investigated what kind of features of a tweet help to get retweets. We construct a model that describes peoples' ... 
Application of robust and inverse optimization in transportation
(Massachusetts Institute of Technology, 2010)We study the use of inverse and robust optimization to address two problems in transportation: finding the travel times and designing a transportation network. We assume that users choose the route selfishly and the flow ... 
Approximation algorithms for rapid evaluation and optimization of architectural and civil structures
(Massachusetts Institute of Technology, 2015)This thesis explores the use of approximation algorithms, sometimes called surrogate modelling, in the earlystage design of structures. The use of approximation models to evaluate design performance scores rapidly could ... 
Approximation of the transient joint queuelength distribution in tandem networks
(Massachusetts Institute of Technology, 2013)This work considers an urban traffic network, and represents it as a Markovian queueing network. This work proposes an analytical approximation of the timedependent joint queuelength distribution of the network. The ... 
Automatic design tool for robust radio frequency decoupling matrices in magnetic resonance imaging
(Massachusetts Institute of Technology, 2015)In this thesis we study the design of robust decoupling matrices for coupled transmit radio frequency arrays used in magnetic resonance imaging (MRI). In a coupled parallel transmit array, because of the coupling itself, ... 
Banded matrices with banded inverses
(Massachusetts Institute of Technology, 2010)We discuss the conditions that are necessary for a given banded matrix to have a banded inverse. Although a generic requirement is known from previous studies, we tend to focus on the ranks of the block matrices that are ... 
A Bayesian approach to feed reconstruction
(Massachusetts Institute of Technology, 2013)In this thesis, we developed a Bayesian approach to estimate the detailed composition of an unknown feedstock in a chemical plant by combining information from a few bulk measurements of the feedstock in the plant along ... 
Blast mitigation strategies for vehicles using shape optimization methods
(Massachusetts Institute of Technology, 2008)This thesis is concerned with the study of blast effects on vehicular structures. The specific problem of a point source blast originating under the vehicle hull is considered, and its impact on the solid body is measured ... 
Blast overpressure relief using air vacated buffer medium
(Massachusetts Institute of Technology, 2009)Blast waves generated by intense explosions cause damage to structures and human injury. In this thesis, a strategy is investigated for relief of blast overpressure resulting from explosions in air. The strategy is based ... 
Characterization of unsteady loading due to impellerdiffuser interaction in centrifugal compressors
(Massachusetts Institute of Technology, 2012)Time dependent simulations are used to characterize the unsteady impeller blade loading due to imipellerdiffuser interaction in centrifugal compressor stages. The capability of simulations are assessed by comparing results ... 
Cheeger sets for unit cube : analytical and numerical solutions for L [infinity] and L² norms
(Massachusetts Institute of Technology, 2008)The Cheeger constant h(Q) of a domain Q is defined as the minimum value of ...... with D varying over all smooth subdomains of Q. The D that achieves this minimum is called the Cheeger set of Q. We present some analytical ... 
Chemistry models for major gas species estimation and tar prediction in fluidized bed biomass gasification
(Massachusetts Institute of Technology, 2016)The present work deals with the process of fluidized bed biomass gasification (FBBG), which is the thermochemical conversion of solid biomass into combustible synthetic gas using a fluidized bed. Fluidized bed gasifiers ... 
Combining local and global optimization for planning and control in information space
(Massachusetts Institute of Technology, 2008)This thesis presents a novel algorithm, called the parametric optimized belief roadmap (POBRM), to address the problem of planning a trajectory for controlling a robot with imperfect state information under uncertainty. ... 
A comparison of discrete and flowbased models for air traffic flow management
(Massachusetts Institute of Technology, 2008)The steady increase of congestion in air traffic networks has resulted in significant economic losses and potential safety issues in the air transportation. A potential way to reduce congestion is to adopt efficient air ...