90,184 research outputs found
From Wrapping to Knowledge
One the most challenging problems for Enterprise Information Integration is to deal with heterogeneous information
sources on the Web. The reason is that they usually provide information that is in human-readable form only, which makes it difficult for
a software agent to understand it. Current solutions build on the idea of annotating the information with semantics. If the information is
unstructured, proposals such as S-CREAM, MnM, or Armadillo may be effective enough since they rely on using natural language
processing techniques; furthermore, their accuracy can be improved by using redundant information on the Web, as C-PANKOW has
proved recently. If the information is structured and closely related to a back-end database, Deep Annotation ranges among the most
effective proposals, but it requires the information providers to modify their applications; if Deep Annotation is not applicable, the
easiest solution consists of using a wrapper and transforming its output into annotations. In this paper, we prove that this
transformation can be automated by means of an efficient, domain-independent algorithm. To the best of our knowledge, this is the first
attempt to devise and formalize such a systematic, general solution.ComisiĂłn Interministerial de Ciencia y TecnologĂa TIC2003-02737-C02-0
Computing the elliptic genus of higher rank E-strings from genus 0 GW invariants
We show that the elliptic genus of the higher rank E-strings can be computed
based solely on the genus 0 Gromov-Witten invariants of the corresponding
elliptic geometry. To set up our computation, we study the structure of the
topological string free energy on elliptically fibered Calabi-Yau manifolds
both in the unrefined and the refined case, determining the maximal amount of
the modular structure of the partition function that can be salvaged. In the
case of fibrations exhibiting only isolated fibral curves, we show that the
principal parts of the topological string partition function at given
base-wrapping can be computed from the knowledge of the genus 0 Gromov-Witten
invariants at this base-wrapping, and the partition function at lower
base-wrappings. For the class of geometries leading to the higher rank
E-strings, this leads to the result stated in the opening sentence.Comment: 40 page
Double-logs, Gribov-Lipatov reciprocity and wrapping
We study analytical properties of the five-loop anomalous dimension of
twist-2 operators at negative even values of Lorentz spin. Following L. N.
Lipatov and A. I. Onishchenko, we have found two possible generalizations of
double-logarithmic equation, which allow to predict a lot of poles of anomalous
dimension of twist-2 operators at all orders of perturbative theory from the
known results. Second generalization is related with the reciprocity-respecting
function, which is a single-logarithmic function in this case. We have found,
that the knowledge of first orders of the reciprocity-respecting function gives
all-loop predictions for the highest poles. Obtained predictions can be used
for the reconstruction of a general form of the wrapping corrections for
twist-2 operators.Comment: 17 pages, references adde
Recommended from our members
Protective wrapping of off-the-shelf components
System designers using off-the-shelf components (OTSCs), whose internals they cannot change, often use add-on “wrappers” to adapt the OTSCs’ behaviour as required. In most cases, wrappers are used to change “functional” properties of the components they wrap. In this paper we discuss instead protective wrapping, the use of wrappers to improve the dependability – i.e., “non-functional” properties like availability, reliability, security, and/or safety – of a component and thus of a system. Wrappers can improve dependability by adding fault tolerance, e.g. graceful degradation, or error recovery mechanisms. We discuss the rational specification of such protective wrappers in view of system dependability requirements, and highlight some of the design trade-offs and uncertainties that affect system design with OTSCs and wrappers, and that differentiate it from other forms of fault-tolerant design
Calibrations, Torsion Classes and Wrapped M-Branes
The present work has two goals. The first is to complete the classification
of geometries in terms of torsion classes of M-branes wrapping cycles of a
Calabi-Yau. The second goal is to give insight into the physical meaning of the
torsion class constraints. We accomplish both tasks by defining new energy
minimizing calibrations in M-brane backgrounds. When fluxes are turned on, it
is these calibrations that are relevant, rather than those which had previously
been defined in the context of purely geometric backgrounds
Percolation on two- and three-dimensional lattices
In this work we apply a highly efficient Monte Carlo algorithm recently
proposed by Newman and Ziff to treat percolation problems. The site and bond
percolation are studied on a number of lattices in two and three dimensions.
Quite good results for the wrapping probabilities, correlation length critical
exponent and critical concentration are obtained for the square, simple cubic,
HCP and hexagonal lattices by using relatively small systems. We also confirm
the universal aspect of the wrapping probabilities regarding site and bond
dilution.Comment: 15 pages, 6 figures, 3 table
Chocolate Bar Wrapping Machine
Gilbert Chocolates has proposed to manufacture a machine to wrap chocolate bars. This machine is intended to replace two people wrapping the chocolate bars by hand, which is a time consuming method. This is especially apparent between October and January when the workers are working long hours in preparation for the Christmas rush of customers. Currently wrapping a bar takes about a minute and Gilbert Chocolates wants this time reduced down to 20-30 seconds. The budget for this project is set at $1000, and is being funded by the company. This machine needs to fit in a cubic foot of space and weigh under 30 pounds for storage purposes. This device can be either purely mechanical with manual input, or it may use step motors and a controller. This project pulls from our knowledge in kinematics, dynamics, 3D modeling, tolerance analysis, material selection, manufacturing techniques, and design of components. From doing this project we will learn how to apply all of these concepts together to solve real world problems. This project will encompass the design, manufacturing of a prototype, and optimization of the chocolate bar wrapping machine in hopes that the price of manufacturing chocolate bars can be reduced for Gilbert Chocolates. The final presentation of this project will include a working prototype, a report, and a presentation. The project will be presented at the Engineering Senior Design Project day. The machine will be operated and displayed at this event
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