Search
Now showing items 21-30 of 2309
Theory and design of integrated optical isolators and broadband couplers using Fresnel zone plates
(Massachusetts Institute of Technology, 2013)
This thesis is divided into two main sections: the first containing the analysis of the broadband vertical coupler, and the second involving the theory and design of the integrated optical isolators. In the first part we ...
Smaller steps for faster algorithms : a new approach to solving linear systems
(Massachusetts Institute of Technology, 2013)
In this thesis we study iterative algorithms with simple sublinear time update steps, and we show how a mix of of data structures, randomization, and results from numerical analysis allow us to achieve faster algorithms ...
An analytical framework for field electron emission, incorporating quantum- confinement effects
(Massachusetts Institute of Technology, 2013)
As field electron emitters shrink to nanoscale dimensions, the effects of quantum confinement of the electron supply and electric field enhancement at the emitter tip play a significant role in determining the emitted ...
Efficient MCMC inference for remote sensing of emission sources
(Massachusetts Institute of Technology, 2015)
A common challenge in environmental impact studies and frontier exploration is identifying the properties of some emitters from remotely obtained concentration data. For example, consider estimating the volume of some ...
Fast Fourier transform on a 3D FPGA
(Massachusetts Institute of Technology, 2005)
Fast Fourier Transforms perform a vital role in many applications from astronomy to cellphones. The complexity of these algorithms results from the many computational steps, including multiplications, they require and, as ...
A study of local approximations in information theory
(Massachusetts Institute of Technology, 2015)
The intractability of many information theoretic problems arises from the meaningful but nonlinear definition of Kullback-Leibler (KL) divergence between two probability distributions. Local information theory addresses ...
Finding important entities in continuous streaming data
(Massachusetts Institute of Technology, 2018)
In many applications that involve processing high-dimensional data, it is important to identify a small set of entities that account for a significant fraction of detections. Rather than formalize this as a clustering ...
Efficient light emitting devices utilizing CdSe(ZnS) quantum dots in organic host matrices
(Massachusetts Institute of Technology, 2002)
We demonstrate efficient electroluminescence from thin film structures containing core-shell CdSe(ZnS) quantum dots dispersed in molecular organic host materials. In the most efficient devices, excitons are created on the ...
Applying Critical Chain to improve the management of uncertainty in projects
(Massachusetts Institute of Technology, 1998)
In an ever intensifying global competitive market, the management of projects, particularly product development efforts, increasingly is one of the few areas which can produce a sustained competitive advantage. Firms that ...
Product development process modeling and analysis of digital wireless telephones
(Massachusetts Institute of Technology, 1998)