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- Biblioteca Digitais de Teses e Dissertações da USP
- Biblioteca Digital da Unicamp
- Oxford University Press
- Universidade Federal de Goiás; BR; UFG; Doutorado em Letras e Linguistica; Linguistica, Letras e Artes
- Monterey, California. Naval Postgraduate School
- Monterey, California: U.S. Naval Postgraduate School
- Frontiers Media S.A.
- Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires
- Universidade Cornell
- Universidade Autônoma de Barcelona
- Mais Publicadores...

## Análise de distúrbios relacionados com a qualidade da energia elétrica utilizando a transformada Wavelet; Analysis of power quality disturbances using Wavelet transform

Fonte: Biblioteca Digitais de Teses e Dissertações da USP
Publicador: Biblioteca Digitais de Teses e Dissertações da USP

Tipo: Dissertação de Mestrado
Formato: application/pdf

Publicado em 07/04/2003
PT

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#Análise multiresolução#Classificação de distúrbios#Classifying disturbances#Multiresolution analysis#Power quality#Qualidade da energia#Transformada Wavelet#Wavelet transform

O presente trabalho visa a utilização da transformada Wavelet no monitoramento do sistema elétrico no que diz respeito a problemas de qualidade da energia com o intuito de detectar, localizar e classificar os mesmos. A transformada Wavelet tem surgido na literatura como uma nova ferramenta para análise de sinais, utilizando funções chamadas Wavelet mãe para mapear sinais em seu domínio, fornecendo informações simultâneas nos domínios tempo e freqüência. A transformada Wavelet é realizada através de filtros decompondo-se um dado sinal em análise multiresolução. Por esta, obtém-se a detecção e a localização de distúrbios relacionados com a qualidade da energia decompondo-se o sinal em dois outros que representam uma versão de detalhes (correspondente as altas freqüências do sinal) e uma versão de aproximação (correspondente as baixas freqüências do sinal). A versão de aproximação é novamente decomposta obtendo-se novos sinais de detalhes e aproximações e assim sucessivamente. Sendo assim, os distúrbios podem ser detectados e localizados no tempo em função do seu conteúdo de freqüência. Estas informações fornecem também características únicas pertinentes a cada distúrbio, permitindo classificá-los. Desta forma...

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## O algebroide classificante de uma estrutura geometrica; The classifying Lie algebroid of a geometric structure

Fonte: Biblioteca Digital da Unicamp
Publicador: Biblioteca Digital da Unicamp

Tipo: Tese de Doutorado
Formato: application/pdf

Publicado em 23/01/2009
PT

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#Algebroide de Lie#Lie#Simetrias de#Geometria diferencial#Lie algebroid#Lie symmetries#Differential geometry

O objetivo desta tese é mostrar como utilizar algebróides de Lie e grupóides de Lie para compreender aspectos das teorias de invariantes, simetrias e espaços de moduli de estruturas geométricas de tipo finito. De uma forma geral, podemos descrever tais estruturas como sendo objetos, definidos em uma variedade, que podem ser caracterizados por correferenciais (possivelmente em outra variedade). Exemplos incluem G-estruturas de tipo finito e geometrias de Cartan. Para uma classe de estruturas geométricas de tipo finito cujo espaço de moduli (dos germes) de seus elementos tem dimensão finita, construímos um algebróide de Lie A X, chamado de algebróide de Lie classificante, que satisfaz as seguintes propriedades: 1. Para cada ponto na base X corresponde um germe de uma estrutura geométrica pertencente à classe. 2. Dois destes germes são isomorfos se e somente se eles correspondem ao mesmo ponto de X. 3. A álgebra de Lie de isotropia de A num ponto x é a álgebra de Lie das simetrias infinitesimais da estrutura geométrica correspondente. 4. Se dois germes de estruturas geométricas pertencem à mesma estrutura geométrica global numa variedade conexa, então eles correspondem a pontos na mesma órbita de A em X. Além do mais...

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## A Neural Architecture for Potentially Classifying Cytology Specimens by Machines*

Fonte: PubMed
Publicador: PubMed

Tipo: Artigo de Revista Científica

Publicado em 07/11/1990
EN

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This paper describes a general purpose vision system. We have applied the system to classifying cytology specimens. The system uses neural network and conventional processing modules to model biological vision systems. The modules make up a locating channel and a classifying channel. The locating channel finds individual cells in the field-of-view. The classifying channel learns and recognizes the cells. Learning is by example. We tested the classifying channel on 156 cell images from human cervical smears. Results suggest one can drive the false negative and false positive rates below a few percent for initial screening. Training would require several hundred cells of normal and abnormal types.

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## Automatically classifying sentences in full-text biomedical articles into Introduction, Methods, Results and Discussion

Fonte: Oxford University Press
Publicador: Oxford University Press

Tipo: Artigo de Revista Científica

EN

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Biomedical texts can be typically represented by four rhetorical categories: Introduction, Methods, Results and Discussion (IMRAD). Classifying sentences into these categories can benefit many other text-mining tasks. Although many studies have applied different approaches for automatically classifying sentences in MEDLINE abstracts into the IMRAD categories, few have explored the classification of sentences that appear in full-text biomedical articles. We first evaluated whether sentences in full-text biomedical articles could be reliably annotated into the IMRAD format and then explored different approaches for automatically classifying these sentences into the IMRAD categories. Our results show an overall annotation agreement of 82.14% with a Kappa score of 0.756. The best classification system is a multinomial naïve Bayes classifier trained on manually annotated data that achieved 91.95% accuracy and an average F-score of 91.55%, which is significantly higher than baseline systems. A web version of this system is available online at—http://wood.ims.uwm.edu/full_text_classifier/.

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## O sistema de classificação nominal Akwe-Xerente (Jê): âmbitos de análise; The system of classification Akwe-Xerente:scope of analysis

Fonte: Universidade Federal de Goiás; BR; UFG; Doutorado em Letras e Linguistica; Linguistica, Letras e Artes
Publicador: Universidade Federal de Goiás; BR; UFG; Doutorado em Letras e Linguistica; Linguistica, Letras e Artes

Tipo: Tese de Doutorado
Formato: application/pdf

POR

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#Linguística#Língua Akwe-Xerente#Sistema de classificação nominal#Classificadores#Termos de classe#Nomes de partes do corpo em função classificadora#Sistema de classificação nominal Akwe-Xerente (Jê)#Linguistics#Akwe-Xerente language#Nominal classifying system#Classifier

The need to describe and document the languages threatened with extinction has been gaining
importance in the last decades, given the growing risks of cultural loss and the knowledge
accumulated by indigenous people. The purpose of continuity of each one of these languages
is ensured by actions based on the results of studies which focus on the description of the
sociolinguistic problem, as well as on the description and analysis of the linguistic aspects
which characterize the language of a determined linguistic family, since the death of a
language means, among many other things, an undetermined loss of the science of
Linguistics and, above all, the disrespect for the rights of these people to preserve their
immaterial richness. The present research has as objective to answer some questions regarding
the use of classifiers, terms of classes and names in classifying function as components of the
classifying system of the language Akwe-Xerente (Jê), spoken by the indigenous people of
the same name. The Akwe-Xerente add up to about 3,100 people and inhabit indigenous
lands in the region of Tocantinia, in the Tocantins State. The description of the system of the
Xerente classification is based on theoretical functional references for the recognition and
differentiation of some nominal radicals which may occur in the function of classifying or
organizing the classes which show common characteristics amongst the designated items such
as form...

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## A taxonomical structure for classifying the goods purchased by the Federal Government

Fonte: Monterey, California. Naval Postgraduate School
Publicador: Monterey, California. Naval Postgraduate School

Tipo: Tese de Doutorado

EN_US

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Approved for public release, distribution unlimited; This thesis is an attempt to develop a taxonomical structure to use in the classification of the goods purchased by the Federal Government. The primary objective was to develop a usable scheme that practitioners could employ in classifying goods along a continuum from simple to complex. A secondary objective of this thesis was to determine the characteristics of the goods, other than their obvious physical differences, to utilize in classifying. Using 21 randomly selected heterogeneous goods and a scaling process, a survey was conducted to determine the relationship between these goods and the chosen characteristics. Cluster analysis was then utilized to group the goods into categories that exhibited similar characteristics. As a result of the research, a taxonomical structure for classifying the population of Government goods into five categories was developed. The potential benefits from using such a scheme could arise in the staffing and directing of procurement functions, training and education of the acquisition workforce, and refinement of procurement policy. It is recommended that the taxonomical model resulting from this research be validated and refined through further use.

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## A taxonomical structure for classifying the services procured by the Federal Government

Fonte: Monterey, California: U.S. Naval Postgraduate School
Publicador: Monterey, California: U.S. Naval Postgraduate School

Tipo: Tese de Doutorado

EN_US

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This thesis was an attempt to develop a taxonomical scheme that practitioners may employ in classifying services that are procured by the Federal Government along a continuum from procurements that are strategically complex. A secondary research objective was to determine what characteristics are appropriate for classifying services on a strategic basis. A literature review, expert interviews, and survey using 20 heterogeneous sample services were conducted to determine the relationship between characteristics and services. Cluster analysis was used to group services into categories with similar compositions of selected characteristics. A taxonomical structure was developed for classifying services into five categories. Potential benefits may arise via application to staffing and directing of procurement functions and refinement of procurement policy. Is is recommended that the taxonomical model resulting from this research be validated and refined through further use.

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## Classifying aging as a disease in the context of ICD-11

Fonte: Frontiers Media S.A.
Publicador: Frontiers Media S.A.

Tipo: Artigo de Revista Científica

Publicado em 04/11/2015
EN

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Aging is a complex continuous multifactorial process leading to loss of function and crystalizing into the many age-related diseases. Here, we explore the arguments for classifying aging as a disease in the context of the upcoming World Health Organization’s 11th International Statistical Classification of Diseases and Related Health Problems (ICD-11), expected to be finalized in 2018. We hypothesize that classifying aging as a disease with a “non-garbage” set of codes will result in new approaches and business models for addressing aging as a treatable condition, which will lead to both economic and healthcare benefits for all stakeholders. Actionable classification of aging as a disease may lead to more efficient allocation of resources by enabling funding bodies and other stakeholders to use quality-adjusted life years (QALYs) and healthy-years equivalent (HYE) as metrics when evaluating both research and clinical programs. We propose forming a Task Force to interface the WHO in order to develop a multidisciplinary framework for classifying aging as a disease with multiple disease codes facilitating for therapeutic interventions and preventative strategies.

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## Espacios clasificantes de categorías fibradas; Classifying spaces of fibred categories

Fonte: Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires
Publicador: Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires

Tipo: info:eu-repo/semantics/doctoralThesis; tesis doctoral; info:eu-repo/semantics/publishedVersion
Formato: application/pdf

Publicado em //2009
SPA

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#CLASSIFYING SPACES#GROTHENDIECK FIBRATIONS#NERVES#SUBDIVISION#2-CATEGORIES#LOOP-SPACES#ESPACIOS CLASIFICANTES#FIBRACIONES DE GROTHENDIECK#NERVIOS DE CATEGORIAS#SUBDIVISIONES#2-CATEGORIAS

Esta tesis se desarrolla en torno al estudio de los espacios clasificantes de fibraciones de categorías. Toda categoría pequeña tiene asociado de un modo natural un espacio topológico, su espacio clasificante. Introducimos variantes de esta construcción para el caso en que la categoría tiene estructura fibrada. A partir de estas nuevas construcciones obtenemos nuevos resultados en la teoría de homotopía de categorías, e interpretamos desde un nuevo punto de vista y de un modo conceptual varios de los teoremas clásicos de Quillen, Segal y Thomason. Entre los resultados obtenidos destacamos una versión relativa del Teorema A de Quillen, una versión homológica de ese mismo Teorema y una sucesión espectral, análoga a la clásica sucesión espectral de Serre, para calcular la homología de fibraciones de Grothendieck. Exponemos también una construcción novedosa para la subdivisión de una categoría, y derivaciones de esta construcción en teoría de homotopía de posets y en teoría de categorías. Por último, estudiamos la generalización de espacios clasificantes a 2-categorías, e implementamos los resultados expuestos en homotopía de categorías fibradas para caracterizar los espacios de lazos de las 2-categorías. Parte de los resultados obtenidos fueron publicados en los artículos [dH08a] y [dH08b]...

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## The Borel-Serre Compactification for the Classifying Space of Hodge Structures

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

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A 1-parameter variation of Hodge structures corresponds to a holomorphic,
horizontal, locally liftable map into a classifying space of Hodge structures.
In this paper it is shown that such a map has a limit in the reductive
Borel-Serre compactification of the classifying space. The boundary component
in which the limit lies is a union over possible polarizations of classifying
spaces of Hodge structures on the primitive parts. It is discussed which
boundary components can contain such limit points.; Comment: This paper has been withdrawn by the author. Errors in article

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## The classifying topos of a topological bicategory

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

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For any topological bicategory B, the Duskin nerve NB of B is a simplicial
space. We introduce the classifying topos BB of B as the Deligne topos of
sheaves Sh(NB) on the simplicial space NB. It is shown that the category of
geometric morphisms Hom(Sh(X),BB) from the topos of sheaves Sh(X) on a
topological space X to the Deligne classifying topos is naturally equivalent to
the category of principal B-bundles. As a simple consequence, the geometric
realization |NB| of the nerve NB of a locally contractible topological
bicategory B is the classifying space of principal B-bundles, giving a variant
of the result of Baas, Bokstedt and Kro derived in the context of bicategorical
K-theory. We also define classifying topoi of a topological bicategory B using
sheaves on other types of nerves of a bicategory given by Lack and Paoli,
Simpson and Tamsamani by means of bisimplicial spaces, and we examine their
properties.; Comment: accepted for a publication in "Homology, Homotopy and Applications"

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## Alternative stable homotopy classification of p-completed classifying spaces

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

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#Mathematics - Algebraic Topology#Mathematics - Group Theory#55R35 (Primary) 20J06, 55P42 (Secondary)

We give an alternative to the stable classification of p-completed homotopy
types of classifying spaces of finite groups offered by Martino-Priddy. For a
finite group G with Sylow subgroup S, we regard the stable p-completed
classifying space of G as an object under the stable p-completed classifying
space of S via the canonical inclusion map. Thus we get a classification in
terms of induced fusion systems. Applying Oliver's solution to the
Martino-Priddy conjecture, we obtain the surprising result that the unstable
p-completed homotopy type of BG is determined by the stable p-completed
inclusion of BS in BG, but not by the stable p-completed homotopy type of BG.; Comment: 10 pages. Clarified text after Definition 1.1 and altered discussion
in Section 4 following suggestions from referee. To appear in Topology

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## A Segal conjecture for p-completed classifying spaces

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

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We formulate and prove a new variant of the Segal Conjecture describing the
group of homotopy classes of stable maps from the p-completed classifying space
of a finite group G to the classifying space of a compact Lie group K as the
p-adic completion of the Grothendieck group of finite principal (G,K)-bundles
whose isotropy groups are p-groups. Collecting the result for different primes
p, we get a new and simple description of the group of homotopy classes of
stable maps between (uncompleted) classifying spaces of groups. This
description allows us to determine the kernel of the map from the Grothendieck
group A(G,K) of finite principal (G,K)-bundles to the group of homotopy classes
of stable maps from BG to BK.; Comment: 31 pages. Minor changes. Final version, to appear in Advances in
Mathematics

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## Classifying spaces for homogeneous manifolds and their related Lie isometry deformations

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 28/02/1996

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Among plenty of applications, low-dimensional homogeneous spaces appear in
cosmological models as both, classical factor spaces of multidimensional
geometry and minisuperspaces in canonical quantization.
Here a new tool to restrict their continuous deformations is presented:
Classifying spaces for homogeneous manifolds and their related Lie isometry
deformations.
The adjoint representation of n-dimensional real Lie algebras induces a
natural topology on their classifying space, which encodes the natural
algebraic relationship between different Lie algebras therein. For n>1 this
topology is not Hausdorffian. Even more it satisfies only the separation axiom
T_0, but not T_1, i.e. there is a constant sequence which has a limit different
from the members of the sequence. Such a limit is called a transition.
Recently it was found that transitions are the natural generalization and
transitive completion of the well-known In\"on\"u-Wigner contractions. For n<5
the relational classifying spaces are constructed explicitly.
Calculating their characteristic scalar invariants via triad representations
of the characteristic isometry, local homogeneous Riemannian 3-spaces are
classified in their natural geometrical relations to each other. Their
classifying space is a composition of pieces with different isometry types.
Although it is Hausdorffian...

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## De Morgan classifying toposes

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 11/08/2008

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We present a general method for deciding whether a Grothendieck topos
satisfies De Morgan's law (resp. the law of excluded middle) or not;
applications to the theory of classifying toposes follow. Specifically, we
obtain a syntactic characterization of the class of geometric theories whose
classifying toposes satisfy De Morgan's law (resp. are Boolean), as well as
model-theoretic criteria for theories whose classifying toposes arise as
localizations of a given presheaf topos.; Comment: 37 pages

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## Classifying spectra of saturated fusion systems

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

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The assignment of classifying spectra to saturated fusion systems was
suggested by Linckelmann and Webb and has been carried out by Broto, Levi and
Oliver. A more rigid (but equivalent) construction of the classifying spectra
is given in this paper. It is shown that the assignment is functorial for
fusion-preserving homomorphisms in a way which extends the assignment of stable
p-completed classifying spaces to finite groups, and admits a transfer theory
analogous to that for finite groups. Furthermore the group of homotopy classes
of maps between classifying spectra is described, and in particular it is shown
that a fusion system can be reconstructed from its classifying spectrum
regarded as an object under the stable classifying space of the underlying
p-group.; Comment: This is the version published by Algebraic & Geometric Topology on 26
February 2006

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## Classifying spaces for braided monoidal categories and lax diagrams of bicategories

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

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This work contributes to clarifying several relationships between certain
higher categorical structures and the homotopy type of their classifying
spaces. Bicategories (in particular monoidal categories) have well understood
simple geometric realizations, and we here deal with homotopy types represented
by lax diagrams of bicategories, that is, lax functors to the tricategory of
bicategories. In this paper, it is proven that, when a certain bicategorical
Grothendieck construction is performed on a lax diagram of bicategories, then
the classifying space of the resulting bicategory can be thought of as the
homotopy colimit of the classifying spaces of the bicategories that arise from
the initial input data given by the lax diagram. This result is applied to
produce bicategories whose classifying space has a double loop space with the
same homotopy type, up to group completion, as the underlying category of any
given (non-necessarily strict) braided monoidal category. Specifically, it is
proven that these double delooping spaces, for categories enriched with a
braided monoidal structure, can be explicitly realized by means of certain
genuine simplicial sets characteristically associated to any braided monoidal
categories, which we refer to as their (Street's) geometric nerves.; Comment: This a revised version (with 59 pages now) of our paper on
realizations of braided categories...

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## Classifying Topoi and Preservation of Higher Order Logic by Geometric Morphisms

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 14/05/2013

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Topoi are categories which have enough structure to interpret higher order
logic. They admit two notions of morphism: logical morphisms which preserve all
of the structure and therefore the interpretation of higher order logic, and
geometric morphisms which only preserve only some of the structure and
therefore only some of the interpretation of higher order logic. The question
then arises: what kinds of higher order theories are preserved by geometric
morphisms? It is known that certain first order theories called internal
geometric theories are preserved by geometric morphisms, and these admit what
are known as classifying topoi. Briefly, a classifying topos for an internal
geometric theory $\mathbb{T}$ in a topos $\mathcal{E}$ is a topos
$\mathcal{E}[\mathbb{T}]$ such that models of $\mathbb{T}$ in any topos
$\mathcal{F}$ with a geometric morphism to $\mathcal{E}$ are in one to one
correspondence with geometric morphisms from $\mathcal{F}$ to
$\mathcal{E}[\mathbb{T}]$ over $\mathcal{E}$. One useful technique for showing
that a higher order theory $\mathcal{T}$ is preserved by geometric morphisms is
to define an internal geometric theory $\mathbb{T}$ of "bad sets" for
$\mathcal{T}$ and show that $\mathcal{T}$ is equivalent to the higher order
theory which says "the classifying topos for $\mathbb{T}$ is degenerate". We
set up a deduction calculus for internal geometric theories and show that it
proves a contradiction if and only if the classifying topos of that theory is
degenerate. We use this result to study a variant of the higher order theory of
Dedekind finite objects and the higher order theory of field objects considered
as ring objects with no non-trivial ideals.

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## Recognizing nullhomotopic maps into the classifying space of a Kac-Moody group

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Relevância na Pesquisa

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This paper extends certain characterizations of nullhomotopic maps between
p-compact groups to maps with target the p-completed classifying space of a
connected Kac-Moody group and source the classifying space of either a
p-compact group or a connected Kac-Moody group. A well known inductive
principle for p-compact groups is applied to obtain general, mapping space
level results. An arithmetic fiber square computation shows that a null map
from the classifying space of a connected compact Lie group to the classifying
space of a connected topological Kac-Moody group can be detected by restricting
to the maximal torus. Null maps between the classifying spaces of connected
topological Kac-Moody groups cannot, in general, be detected by restricting to
the maximal torus due to the nonvanishing of an explicit abelian group of
obstructions described here. Nevertheless, partial results are obtained via the
application of algebraic discrete Morse theory to higher derived limit
calculations which show that such detection is possible in many cases of
interest.; Comment: References added, minor corrections; 29 pages, 4 figures, one table

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## Intermediaries in Bredon (co)homology and classifying spaces

Fonte: Universidade Autônoma de Barcelona
Publicador: Universidade Autônoma de Barcelona

Tipo: Artigo de Revista Científica
Formato: application/pdf

Publicado em //2012
ENG

Relevância na Pesquisa

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For certain contractible G-CW-complexes and F a family of subgroups of G, we construct a spectral sequence converging to the F-Bredon cohomology of G with E1-terms given by the F-Bredon cohomology of the stabilizer subgroups. As applications, we obtain several corollaries concerning the cohomological and geometric dimensions of the classifying space EFG. We also introduce, for any subgroup closed class of groups F, a hierarchically de ned class of groups and show that if a group G is in this class, then G has finite F ∩ G-Bredon (co)homological dimension if and only if G has jump F ∩ G-Bredon (co)homology.

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