621 research outputs found
Forecasting stock price movements using neural networks
Includes bibliographical references (p. 99-101).The prediction of security prices has shown to be one of the most important but most difficult tasks in financial operations. Linear approaches failed to model the non-linear behaviour of markets and non-linear approaches turned out to posses too many constraints. Neural networks seem to be a suitable method to overcome these problems since they provide algorithms which process large sets of data from a non-linear context and yield thorough results. The first problem addressed by this research paper is the applicability of neural networks with respect to markets as a tool for pattern recognition. It will be shown that markets posses the necessary requirements for the use of neural networks, i.e. markets show patterns which are exploitable
Implicit-Explicit Time Integration for the Immersed Wave Equation
Immersed boundary methods simplify mesh generation by embedding the domain of
interest into an extended domain that is easy to mesh, introducing the
challenge of dealing with cells that intersect the domain boundary. Combined
with explicit time integration schemes, the finite cell method introduces a
lower bound for the critical time step size. Explicit transient analyses
commonly use the spectral element method due to its natural way of obtaining
diagonal mass matrices through nodal lumping. Its combination with the finite
cell method is called the spectral cell method. Unfortunately, a direct
application of nodal lumping in the spectral cell method is impossible due to
the special quadrature necessary to treat the discontinuous integrand inside
the cut cells. We analyze an implicit-explicit (IMEX) time integration method
to exploit the advantages of the nodal lumping scheme for uncut cells on one
side and the unconditional stability of implicit time integration schemes for
cut cells on the other. In this hybrid, immersed Newmark IMEX approach, we use
explicit second-order central differences to integrate the uncut degrees of
freedom that lead to a diagonal block in the mass matrix and an implicit
trapezoidal Newmark method to integrate the remaining degrees of freedom (those
supported by at least one cut cell). The immersed Newmark IMEX approach
preserves the high-order convergence rates and the geometric flexibility of the
finite cell method. We analyze a simple system of spring-coupled masses to
highlight some of the essential characteristics of Newmark IMEX time
integration. We then solve the scalar wave equation on two- and
three-dimensional examples with significant geometric complexity to show that
our approach is more efficient than state-of-the-art time integration schemes
when comparing accuracy and runtime
Accelerated Ru-Cu Trinuclear Cooperative C−H Bond Functionalization of Carbazoles : A Kinetic and Computational Investigation
The mechanism of a trinuclear cooperative dehydrogenative C−N bond-forming reaction is investigated in this work, which avoids the use of chelate-assisting directing groups. Two new highly efficient Ru/Cu co-catalyzed systems were identified, allowing orders of magnitude greater TOFs than the previous state of the art. In-depth kinetic studies were performed in combination with advanced DFT calculations, which reveal a decisive rate-determining trinuclear Ru-Cu cooperative reductive elimination step (CRE)
The Iowa Homemaker vol.39A, no.1
Follow an Oriental Formula, Marty Keeney, page 4
Planning + Imagination = Shower Success, Mary Jacobs Jensen, page 5
Gridiron Greats, Gail Devens, page 6
About Discount Houses, Carol Shellenbarger, page 7
Hem Yourself a Harem, Marcena Christian, page 8
Facial Focus, Marilyn Bratten, page 10
Does Your Equipment Measure Up?, Helen Rank, page 11
What’s Going On?, page 12
Inside Story, page 1
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