Browsing Computation for Design and Optimization (CDO) by Issue Date
Now showing items 2140 of 170

A linear multigrid preconditioner for the solution of the NavierStokes equations using a discontinuous Galerkin discretization
(Massachusetts Institute of Technology, 2007)A NewtonKrylov method is developed for the solution of the steady compressible NavierStokes equations using a Discontinuous Galerkin (DG) discretization on unstructured meshes. An element LineJacobi preconditioner is ... 
Must linear algebra be block cyclic? : and other explorations into the expressivity of data parallel and task parallel languages
(Massachusetts Institute of Technology, 2007)Prevailing Parallel Linear Algebra software block cyclically distributes data across its processors for good load balancing and communication between its nodes. The block cyclic distribution schema characterized by cyclic ... 
A fast 3D fullwave solver for nanophotonics
(Massachusetts Institute of Technology, 2007)Conventional fast integral equation solvers seem to be ideal approaches for simulating 3D nanophotonic devices, as these devices are considered to be open structures, generating fields in both an interior channel and in ... 
Discontinuous Galerkin solution of the Boltzmann equation in multiple spatial dimensions
(Massachusetts Institute of Technology, 2007)This thesis focuses on the numerical solution of a kinetic description of small scale dilute gas flows when the NavierStokes description breaks down. In particular, it investigates alternative solution techniques for the ... 
Datadriven revenue management
(Massachusetts Institute of Technology, 2007)In this thesis, we consider the classical newsvendor model and various important extensions. We do not assume that the demand distribution is known, rather the only information available is a set of independent samples ... 
Development of discontinuous Galerkin method for nonlocal linear elasticity
(Massachusetts Institute of Technology, 2007)A number of constitutive theories have arisen describing materials which, by nature, exhibit a nonlocal response. The formulation of boundary value problems, in this case, leads to a system of equations involving higherorder ... 
Robust transportation network design under user equilibrium
(Massachusetts Institute of Technology, 2007)We address the problem of designing a transportation network in the presence of demand uncertainty, multiple origindestination pairs and a budget constraint for the overall construction cost, under the behavioral assumption ... 
Fullykinetic PIC simulations for Halleffect thrusters
(Massachusetts Institute of Technology, 2007)In recent years, many groups have numerically modeled the nearanode region of a Hall thruster in attempts to better understand the associated physics of thruster operation. Originally, simulations assumed a continuum ... 
Recovery of primal solution in dual subgradient schemes
(Massachusetts Institute of Technology, 2007)In this thesis, we study primal solutions for general optimization problems. In particular, we employ the subgradient method to solve the Lagrangian dual of a convex constrained problem, and use a primalaveraging scheme ... 
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 ... 
Multilevel spectral clustering : graph partitions and image segmentation
(Massachusetts Institute of Technology, 2008)While the spectral graph partitioning method gives high quality segmentation, segmenting large graphs by the spectral method is computationally expensive. Numerous multilevel graph partitioning algorithms are proposed to ... 
A fast enriched FEM for Poisson equations involving interfaces
(Massachusetts Institute of Technology, 2008)We develop a fast enriched finite element method for solving Poisson equations involving complex geometry interfaces by using regular Cartesian grids. The presence of interfaces is accounted for by developing suitable jump ... 
LPbased subgradient algorithm for joint pricing and inventory control problems
(Massachusetts Institute of Technology, 2008)It is important for companies to manage their revenues and reduce their costs efficiently. These goals can be achieved through effective pricing and inventory control strategies. This thesis studies a joint multiperiod ... 
A simulationbased resource optimization and time reduction model using design structure matrix
(Massachusetts Institute of Technology, 2008)Project scheduling is an important research and application area in engineering management. Recent research in this area addresses resource constraints as well as stochastic durations. This thesis presents a simulationbased ... 
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 ... 
Robust scheduling in forest operations planning
(Massachusetts Institute of Technology, 2008)Forest operations planning is a complex decision process which considers multiple objectives on the strategic, tactical and operational horizons. Decisions such as where to harvest and in what order over different time ... 
Model reduction for dynamic sensor steering : a Bayesian approach to inverse problems
(Massachusetts Institute of Technology, 2008)In many settings, distributed sensors provide dynamic measurements over a specified time horizon that can be used to reconstruct information such as parameters, states or initial conditions. This estimation task can be ... 
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 ... 
Solution of fluidstructure interaction problems using a discontinuous Galerkin technique
(Massachusetts Institute of Technology, 2008)The present work aims to address the problem of fluidstructure interaction using a discontinuous Galerkin approach. Starting from the NavierStokes equations on a fixed domain, an arbitrary Lagrangian Eulerian (ALE) ... 
A preconditioned NewtonKrylov method for computing steadystate pulse solutions of modelocked lasers
(Massachusetts Institute of Technology, 2008)We solve the periodic boundary value problem for a modelocked laser cavity using a specially preconditioned matriximplicit NewtonKrylov solver. Solutions are obtained at least an order of magnitude faster than with ...