Now showing items 146-165 of 170

    • Semidefinite relaxation based branch-and-bound method for nonconvex quadratic programming 

      Hu, Sha, S.M. Massachusetts Institute of Technology (Massachusetts Institute of Technology, 2006)
      In this thesis, we use a semidefinite relaxation based branch-and-bound method to solve nonconvex quadratic programming problems. Firstly, we show an interval branch-and-bound method to calculate the bounds for the minimum ...
    • Sensitivity analysis of oscillating hybrid systems 

      Saxena, Vibhu Prakash (Massachusetts Institute of Technology, 2010)
      Many models of physical systems oscillate periodically and exhibit both discrete-state and continuous-state dynamics. These systems are called oscillating hybrid systems and find applications in diverse areas of science ...
    • Setting optimal production lot sizes and planned lead times in a job shop system 

      Yuan, Rong, Ph. D. Massachusetts Institute of Technology (Massachusetts Institute of Technology, 2013)
      In this research we model a job shop that produces a set of discrete parts in a make-to-stock setting. The intent of the research is to develop a planning model to determine the optimal operating tactics that minimize the ...
    • A shifting method for dynamic system Model Order Reduction 

      Xu, Song, S.M. Massachusetts Institute of Technology (Massachusetts Institute of Technology, 2007)
      Model Order Reduction (MOR) is becoming increasingly important in computational applications. At the same time, the need for more comprehensive models of systems is generating problems with increasing numbers of outputs ...
    • Silence of the lamb waves 

      Benjamin, Rishon Robert (Massachusetts Institute of Technology, 2017)
      Roll-to-Roll (R2R) manufacturing has seen great interest in the recent decade due to the proliferation of personalized and wearable devices for monitoring a variety of biometrics. Given the sensitive nature of the potential ...
    • Simulation and design optimization for linear wave phenomena on metamaterials 

      Saà-Seoane, Joel (Massachusetts Institute of Technology, 2011)
      Periodicity can change materials properties in a very unintuitive way. Many wave propagation phenomena, such as waveguides, light bending structures or frequency filters can be modeled through finite periodic structures ...
    • Simulation and optimization of hot syngas separation processes in integrated gasification combined cycle 

      Prakash, Kshitij (Massachusetts Institute of Technology, 2009)
      IGCC with CO2 capture offers an exciting approach for cleanly using abundant coal reserves of the world to generate electricity. The present state-of-the-art synthesis gas (syngas) cleanup technologies in IGCC involve ...
    • Simulation and visualization of malaria transmission In West Africa 

      Qiu, Xin, S.M. Massachusetts Institute of Technology (Massachusetts Institute of Technology, 2016)
      This thesis consists of a simulation-based study and a data visualization framework development focusing on malaria transmission in West Africa. The simulation-based study introduces the concept of hysteresis in malaria ...
    • A simulation-based resource optimization and time reduction model using design structure matrix 

      Zhang, Yifeng, S.M. Massachusetts Institute of Technology (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 simulation-based ...
    • Situational awareness framework for risk ranking 

      Li, Rongsha (Massachusetts Institute of Technology, 2015)
      Today, organizations are generating large volumes of data. However, the challenge of extracting valuable information from the data has been a large and long-standing problem. Here, we address the problem of quantifying ...
    • Solution of fluid-structure interaction problems using a discontinuous Galerkin technique 

      Mohnot, Anshul (Massachusetts Institute of Technology, 2008)
      The present work aims to address the problem of fluid-structure interaction using a discontinuous Galerkin approach. Starting from the Navier-Stokes equations on a fixed domain, an arbitrary Lagrangian Eulerian (ALE) ...
    • Stochastic methods for improving secondary production decisions under compositional uncertainty 

      Gaustad, Gabrielle G (Massachusetts Institute of Technology, 2009)
      A key element for realizing long term sustainable use of any metal will be a robust secondary recovery industry. Secondary recovery forestalls depletion of non-renewable resources and avoids the deleterious effects of ...
    • Supply chain network for hydrogen transportation in Spain 

      Liang, Li (Massachusetts Institute of Technology, 2010)
      Hydrogen fuel is considered one of the major emerging renewable substitutes for fossil fuel. A crucial factor as to whether hydrogen will be successful depends on its cost as a substitute. Recently, there has been a growing ...
    • Surrogate modeling for large-scale black-box systems 

      Liem, Rhea Patricia (Massachusetts Institute of Technology, 2007)
      This research introduces a systematic method to reduce the complexity of large-scale blackbox systems for which the governing equations are unavailable. For such systems, surrogate models are critical for many applications, ...
    • Surrogate-based optimization of a BioMEMs microfluidic weir 

      Ooi, Boon Hooi (Massachusetts Institute of Technology, 2008)
      BioMEM microfluidic weirs enable biologists to study biological processes at the cell level. A novel substrate-affixed microfluidic array of weirs allows active sorting of cells via control electrodes. The ability of the ...
    • A tactical planning model for a serial flow manufacturing system 

      Huang, Bin, S.M. Massachusetts Institute of Technology (Massachusetts Institute of Technology, 2010)
      This project aims to improve the operation and planning of a specific type of manufacturing system, a serial flow line that entails a sequence of process stages. The objective is to investigate inventory policy, raw material ...
    • Tensor decomposition and parallelization of Markov Decision Processes 

      Smart, David P. (David Paul) (Massachusetts Institute of Technology, 2016)
      Markov Decision Processes (MDPs) with large state spaces arise frequently when applied to real world problems. Optimal solutions to such problems exist, but may not be computationally tractable, as the required processing ...
    • Testing for jumps and cojumps in financial markets 

      Ju, Cheng, S.M. Massachusetts Institute of Technology (Massachusetts Institute of Technology, 2010)
      In this thesis, we introduce a new testing methodology to detect cojumps in multi-asset returns. We define a cojump as a jump in at least one dimension of the return processes. For a multivariate process that follows a ...
    • A thread-based parallel programming library for numerical algorithms 

      Alhubail, Maitham Makki (Maitham Makki Hussain) (Massachusetts Institute of Technology, 2014)
      This thesis presents a new simple lightweight C++ thread based parallelization library, intended for use in numerical algorithms. It provides simple multitasking and task synchronization functions. The library hides all ...
    • The (travel) times they are a changing : a computational framework for the diagnosis of non-alcoholic fatty liver disease (NAFLD) 

      Benjamin, Alex (Alex Robert) (Massachusetts Institute of Technology, 2017)
      We propose and validate a non-invasive method to diagnose Non-Alcoholic Fatty Liver Disease (NAFLD). The proposed method is based on two fundamental concepts: 1) the speed of sound in a fatty liver is lower than that in a ...