Now showing items 32-51 of 170

    • Data-driven models for reliability prognostics of gas turbines 

      Kumar, Gaurev (Massachusetts Institute of Technology, 2015)
      This thesis develops three data-driven models of a commercially operating gas turbine, and applies inference techniques for reliability prognostics. The models focus on capturing feature signals (continuous state) and ...
    • Data-driven revenue management 

      Uichanco, Joline Ann Villaranda (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 ...
    • A decentralized incentive mechanism for company-wide energy consumption reduction 

      Wang, Jingxi, S.M. Massachusetts Institute of Technology (Massachusetts Institute of Technology, 2010)
      This thesis proposes a decentralized reward-based incentive mechanism to address the problem of noncomplying subsidiaries when the parent company wish to meet its targeted energy consumption level. Besides its effectiveness ...
    • Design of a composite combat helmet liner for prevention of blast-induced traumatic brain injury 

      Vechart, Andrew (Andrew Peter) (Massachusetts Institute of Technology, 2011)
      Air blast-induced traumatic brain injuries (TBIs) represent a significant percentage of military personnel injuries observed in Operation Enduring Freedom (OEF) and Operation Iraqi Freedom (OIF). Prevalence of blast-induced ...
    • Development of discontinuous Galerkin method for nonlocal linear elasticity 

      Bala Chandran, Ram (Massachusetts Institute of Technology, 2007)
      A number of constitutive theories have arisen describing materials which, by nature, exhibit a non-local response. The formulation of boundary value problems, in this case, leads to a system of equations involving higher-order ...
    • A diagnostic analysis of retail out-of-stocks 

      Foo, Yong Ning (Massachusetts Institute of Technology, 2007)
      In the highly competitive retail industry, merchandise out-of-stock (OOS) is a significant and pertinent problem. This thesis performs a diagnostic analysis on retail out-of-stocks using empirical data from a major retailer. ...
    • Discontinuous Galerkin solution of the Boltzmann equation in multiple spatial dimensions 

      Lian, Zhengyi (Massachusetts Institute of Technology, 2007)
      This thesis focuses on the numerical solution of a kinetic description of small scale dilute gas flows when the Navier-Stokes description breaks down. In particular, it investigates alternative solution techniques for the ...
    • Domain partitioning to bound moments of differential equations using semidefinite optimization 

      Sethuraman, Sandeep (Massachusetts Institute of Technology, 2006)
      In this thesis, we present a modification of an existing methodology to obtain a hierarchy of lower and upper bounds on moments of solutions of linear differential equations. The motivation for change is to obtain tighter ...
    • The effectiveness of a simple policy for coordinating inventory control and pricing strategies 

      Sun, Zhibo, S.M. Massachusetts Institute of Technology (Massachusetts Institute of Technology, 2010)
      We investigate the effectiveness of an (s, S, p) policy relative to an (s, S, A, p) policy in a single product, periodic review, finite horizon model with stochastic multiplicative demand and fixed ordering cost, in which ...
    • Efficient reduced-basis approximation of scalar nonlinear time-dependent convection-diffusion problems, and extension to compressible flow problems 

      Men, Han (Han Abby) (Massachusetts Institute of Technology, 2006)
      In this thesis, the reduced-basis method is applied to nonlinear time-dependent convection-diffusion parameterized partial differential equations (PDEs). A proper orthogonal decomposition (POD) procedure is used for the ...
    • Empirical comparison of robust, data driven and stochastic optimization 

      Wang, Yanbo, S.M. Massachusetts Institute of Technology (Massachusetts Institute of Technology, 2008)
      In this thesis, we compare computationally four methods for solving optimization problems under uncertainty: * Robust Optimization (RO) * Adaptive Robust Optimization (ARO) * Data Driven Optimization (DDO) * stochastic ...
    • Energy optimal path planning using stochastic dynamically orthogonal level set equations 

      Narayanan Subramani, Deepak (Massachusetts Institute of Technology, 2014)
      The growing use of autonomous underwater vehicles and underwater gliders for a variety of applications gives rise to new requirements in the operation of these vehicles. One such important requirement is optimization of ...
    • Enhancements and computational evaluation of the hit-and-run random walk on polyhedra 

      Liang, Jiajie, S.M. Massachusetts Institute of Technology (Massachusetts Institute of Technology, 2006)
      The symmetry function of a convex set offers us numerous useful information about the set in relation to probabilistic theory and geometric properties. The symmetry function is a measure of how symmetric the convex set is, ...
    • Evaluating Intrusion Detection Systems for Energy Diversion Attacks 

      Sethi, Abhishek Rajkumar (Massachusetts Institute of Technology, 2016)
      The widespread deployment of smart meters and ICT technologies is enabling continuous collection of high resolution data about consumption behavior and health of grid infrastructure. This has also spurred innovations in ...
    • Evaluation of cost balancing policies in multi-echelon stochastic inventory control problems 

      Yu, Qian, S.M. Massachusetts Institute of Technology (Massachusetts Institute of Technology, 2010)
      We study a periodic-reviewed, infinite horizon serial network inventory control problem. The demands in different periods are independent of each other and follow an identical Poisson distribution. Unsatisfied demands are ...
    • The Evolutionary Design Model (EDM) for the design of complex engineered systems : Masdar City as a case study 

      Alfaris, Anas (Anas Faris) (Massachusetts Institute of Technology, 2009)
      This thesis develops a framework for constructing an Evolutionary Design Model (EDM) that would enhance the design of complex systems through an efficient process. The framework proposed is generic and suggests a group of ...
    • Fairness and optimality in trading 

      Nguyen, Van Vinh, S.M. Massachusetts Institute of Technology (Massachusetts Institute of Technology, 2010)
      This thesis proposes a novel approach to address the issues of efficiency and fairness when multiple portfolios are rebalanced simultaneously. A fund manager who rebalances multiple portfolios needs to not only optimize ...
    • A fast 3D full-wave solver for nanophotonics 

      Zhang, Lei, Ph. D. Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science. (Massachusetts Institute of Technology, 2007)
      Conventional fast integral equation solvers seem to be ideal approaches for simulating 3-D nanophotonic devices, as these devices are considered to be open structures, generating fields in both an interior channel and in ...
    • A fast enriched FEM for Poisson equations involving interfaces 

      Huynh, Thanh Le Ngoc (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 ...
    • Fully-kinetic PIC simulations for Hall-effect thrusters 

      Fox, Justin M., 1981- (Massachusetts Institute of Technology, 2007)
      In recent years, many groups have numerically modeled the near-anode region of a Hall thruster in attempts to better understand the associated physics of thruster operation. Originally, simulations assumed a continuum ...