http://www.fct.mctes.pt/unidades/08/default.asp?p=1
Foi realizada uma reunião do Conselho do CEOC no dia 17/Dezembro/2008, após
a recepção da avaliação da unidade.
CEOC obteve "Very Good" na avaliação de 2007
Os resultados das várias UI&D portuguesas encontram-se aqui:
http://www.fct.mctes.pt/unidades/08/default.asp?p=1
http://www.fct.mctes.pt/unidades/08/default.asp?p=1
6th Iberian Workshop on Computational Geometry
The 6th IWCG intends to bring together, in an informal setting, researchers and students working in geometric computation. Its purpose is learning from each other of recent evolution on problems of common interest, leaving sufficient time for discussion and posing of new problems.
January 28-30,2009, Universidade de Aveiro, Portugal more details...
January 28-30,2009, Universidade de Aveiro, Portugal more details...
Lecture at foreigner university: Scattering by obstacles
Evgeny Lakshtanov will give an invited lecture in Mathematics Institut in
Munique.
http://www.mathematik.uni-muenchen.de/~lerdos/os0809/
Munique.
http://www.mathematik.uni-muenchen.de/~lerdos/os0809/
Recent publications and communications from Tatiana Tchemisova (CEOC Member)
Publications:
1) Kostyukova O.I., Tchemisova T.V, Yermalinskaya S.A.
{\it On One Optimality Criterion for the Problem of Convex Semi-Infinite
Programming}, proceedings of International Scientific Conference "X
Belarusian Mathematical Conference", Minsk, Belarus, 3-7 of November 2008,
pp.
101-102 (proceedings with referee).
2)Ozogur-Akyuz S., Akteke-Ozturk B., Tchemisova T., and Weber G.-W., {\it
New Optimization Methods in Data Mining}, proceedings of International
Conference "Operations Research 2008", Augsburg, Germany, September 3-5,
2008,(Accepted for proceedings with referee).
3)Kostyukova O.I., Tchemisova T.V., {\it Sufficient Optimality Conditions
for Convex Semi-Infinite Programming}, accepted to publication in Special
Issue of "Optimization Methods and Software", 2008.
4) Tchemisova T.V., Yermalinskaya S.A., {\it Algorithm of Determination of
the Orders of Immobile Indices and Implicit Optimality Criterion for the
Problems of Convex Semi-Infinite Programming}, proceedings of the
International Conference "Dynamic Systems: Stability, Control,
Optimization", devoted to 90-th anniversary of academician E.A.Barbashin,
p.165-166, Minsk, Belarus, 29
September-4 October, 2008 (proceedings with referee), pp.165-166.
1) Kostyukova O.I., Tchemisova T.V, Yermalinskaya S.A.
{\it On One Optimality Criterion for the Problem of Convex Semi-Infinite
Programming}, proceedings of International Scientific Conference "X
Belarusian Mathematical Conference", Minsk, Belarus, 3-7 of November 2008,
pp.
101-102 (proceedings with referee).
2)Ozogur-Akyuz S., Akteke-Ozturk B., Tchemisova T., and Weber G.-W., {\it
New Optimization Methods in Data Mining}, proceedings of International
Conference "Operations Research 2008", Augsburg, Germany, September 3-5,
2008,(Accepted for proceedings with referee).
3)Kostyukova O.I., Tchemisova T.V., {\it Sufficient Optimality Conditions
for Convex Semi-Infinite Programming}, accepted to publication in Special
Issue of "Optimization Methods and Software", 2008.
4) Tchemisova T.V., Yermalinskaya S.A., {\it Algorithm of Determination of
the Orders of Immobile Indices and Implicit Optimality Criterion for the
Problems of Convex Semi-Infinite Programming}, proceedings of the
International Conference "Dynamic Systems: Stability, Control,
Optimization", devoted to 90-th anniversary of academician E.A.Barbashin,
p.165-166, Minsk, Belarus, 29
September-4 October, 2008 (proceedings with referee), pp.165-166.
Communications:
1)Kostyukova O.I., Tchemisova T.V, Yermalinskaya S.A. {\it On One Optimality
Criterion for the Problem of Convex Semi-Infinite Programming},
International Scientific Conference "X Belarusian Mathematical Conference",
Minsk, Belarus, 3-7 of November 2008.
(regular seminar) Necessary optimality conditions and implicit function
Orador: ARAM ARUTYUNOV, Peoples Friendship University of Russia, Moscow.
Resumo: The talk consists of two parts. The first part is devoted to the abstract minimization problem with constraints, which is called the mathematical programming problem. In the second part we discuss local properties of smooth nonlinear mappings in a neighborhood of an abnormal point. The problems that are studied in this talk (of course, in addition to their extremal nature) are united by the fact that we are mainly interested in studying the so-called abnormal or nonlinearized problems.
Resumo: The talk consists of two parts. The first part is devoted to the abstract minimization problem with constraints, which is called the mathematical programming problem. In the second part we discuss local properties of smooth nonlinear mappings in a neighborhood of an abnormal point. The problems that are studied in this talk (of course, in addition to their extremal nature) are united by the fact that we are mainly interested in studying the so-called abnormal or nonlinearized problems.
Computer Application available from the Maple Application Centre
Title: Computing ODE symmetries as abnormal variational symmetries.
Authors: Paulo D. F. Gouveia and Delfim F. M. Torres
Application Type: Maple Worksheet Publish date: November, 2008
URL:
http://www.maplesoft.com/applications/app_center_view.aspx?AID=2326&CID=1&SC
ID=94
Authors: Paulo D. F. Gouveia and Delfim F. M. Torres
Application Type: Maple Worksheet Publish date: November, 2008
URL:
http://www.maplesoft.com/applications/app_center_view.aspx?AID=2326&CID=1&SC
ID=94
(local seminar) Rotas Seguras usando a 2-cobertura
Inês Pereira deMatos, Estudante de Doutoramento, Universidade de Aveiro.
Resumo: Dados n discos de raio r no plano, que representam
antenas, radares, sensores ou outros equipamentos de
vigilância com alcance limitado. Um ponto no plano está
2-coberto se estiver coberto por pelo menos dois destes discos.
Na sequência da importância prática desta classe de
problemas e dos resultados obtidos para minimizar o alcance
dos equipamentos de vigilância para 2-cobrir um ponto, apresentaremos
alguns resultados relacionados com o cálculo do
alcance mínimo para a 2-cobertura de um segmento de recta,
uma linha poligonal, um polígono arbitrário e um conjunto
de pontos no plano. Como último caso, analisaremos como
encontrar a melhor rota segura (2-coberta) entre duas localizações
(vértices) num grafo não dirigido, grafo esse que
representa um mapeamento de estradas.
21 de Novembro de 2008 (Departamento de Matemática, sala Sousa Pinto,
11:00-12:00)
Resumo: Dados n discos de raio r no plano, que representam
antenas, radares, sensores ou outros equipamentos de
vigilância com alcance limitado. Um ponto no plano está
2-coberto se estiver coberto por pelo menos dois destes discos.
Na sequência da importância prática desta classe de
problemas e dos resultados obtidos para minimizar o alcance
dos equipamentos de vigilância para 2-cobrir um ponto, apresentaremos
alguns resultados relacionados com o cálculo do
alcance mínimo para a 2-cobertura de um segmento de recta,
uma linha poligonal, um polígono arbitrário e um conjunto
de pontos no plano. Como último caso, analisaremos como
encontrar a melhor rota segura (2-coberta) entre duas localizações
(vértices) num grafo não dirigido, grafo esse que
representa um mapeamento de estradas.
21 de Novembro de 2008 (Departamento de Matemática, sala Sousa Pinto,
11:00-12:00)
(course) "Numerical issues in semi-infinite programming and applications"
by Professor Sven-Ake Gustafson, Professor emeritus in Applied Mathematics,
University of Stavanger, Norway.
Lection 1. Representing real numbers in a computer. Very simple examples of
semi-infinite programs including global optimization. Cl
Lection 2. Duality results in semi-infinite optimization. Approximation by
means of discretisation.
Lection 3. Semi-infinite programming in numerical analysis: approximation,
quadrature and convergence acceleration.
Lection 4. Applications to air pollution control and the treatment of
integral equations in the petroleum industry
Place: Mathematics Departament at University of Aveiro.
For more details, please contact Tatiana Tchemisova [tatiana@ua.pt].Data do curso: November 19-20, 2008.
University of Stavanger, Norway.
Lection 1. Representing real numbers in a computer. Very simple examples of
semi-infinite programs including global optimization. Cl
Lection 2. Duality results in semi-infinite optimization. Approximation by
means of discretisation.
Lection 3. Semi-infinite programming in numerical analysis: approximation,
quadrature and convergence acceleration.
Lection 4. Applications to air pollution control and the treatment of
integral equations in the petroleum industry
Place: Mathematics Departament at University of Aveiro.
For more details, please contact Tatiana Tchemisova [tatiana@ua.pt].Data do curso: November 19-20, 2008.
(local seminar)Reconhecimento de grafos hamiltonianos com recurso
Orador: DomingosMoreira Cardoso, Universidade de Aveiro.
Resumo: A partir da subdivisão G_ de um grafo arbitrário G, verifica-se a existência de um 2-factor e introduz-se um algoritmo para o reconhecimento de ciclos de Hamilton. Estende-se a análise de grafos com dois valores próprios principais a famílias de grafos com no máximo k valores próprios principais, com 2 <= k <= n, e apresentam-se alguns problemas em aberto.
14 de Novembro de 2008. Departamento de Matemática, sala Sousa Pinto, 11:00-12:00.
(published article) Computational Approach to Essential and Nonessential Objective
Authors: Agnieszka B. Malinowska and Delfim F. M. Torres
Title: Computational Approach to Essential and Nonessential Objective
Functions in Linear Multicriteria Optimization
Journal: Journal of Optimization Theory and Applications
Impact Factor: 0.688
Publisher: Springer Netherlands
ISSN: 0022-3239 (Print) 1573-2878 (Online)
Issue: Volume 139, Number 3 / December, 2008
Pages: 577-590
Title: Computational Approach to Essential and Nonessential Objective
Functions in Linear Multicriteria Optimization
Journal: Journal of Optimization Theory and Applications
Impact Factor: 0.688
Publisher: Springer Netherlands
ISSN: 0022-3239 (Print) 1573-2878 (Online)
Issue: Volume 139, Number 3 / December, 2008
Pages: 577-590
(local seminar) Reconhecimento de grafos hamiltonianos com recurso a técnicas espectrais
Orador: DomingosMoreira Cardoso, Universidade de Aveiro.
Resumo: A partir dos conceitos de valor próprio principal e polinómio
característico principal de um grafo G, deduzem-se várias propriedades e
algumas relações com a designada Walking Matrix de G. Determinam-se famílias
de grafos não regulares de ordem arbitrária com maior valor próprio
constante e, como aplicação de alguns dos resultados introduzidos,
apresenta-se um algoritmo para o reconhecimento de grafos de Hamilton.
Resumo: A partir dos conceitos de valor próprio principal e polinómio
característico principal de um grafo G, deduzem-se várias propriedades e
algumas relações com a designada Walking Matrix de G. Determinam-se famílias
de grafos não regulares de ordem arbitrária com maior valor próprio
constante e, como aplicação de alguns dos resultados introduzidos,
apresenta-se um algoritmo para o reconhecimento de grafos de Hamilton.
(local seminar) "Turing machine and Cellular Automata for primary school"
Orador: Evgeny Lakshtanov, Universidade de Aveiro.
Resumo: We consider some properties of these mathematical objects
which are exciting for mathematical community and then we discuss
some meaningful tasks for primary school pupils. One of the purposes
of this research is to introduce for children some mathematical worlds
which are aesthetical and natural, quite rich but still not too complicated
for self-study.
Resumo: We consider some properties of these mathematical objects
which are exciting for mathematical community and then we discuss
some meaningful tasks for primary school pupils. One of the purposes
of this research is to introduce for children some mathematical worlds
which are aesthetical and natural, quite rich but still not too complicated
for self-study.
(new PhD Thesis) "Modelação e optimização da distribuição de combustíveis e gestão portuária em Cabo Verde"
(in Portugese)
Aluno: Alexandrino Duarte Delgado
Orientador: Agostinho Agra
Co-orientador: Domingos Moreira Cardoso
Aluno: Alexandrino Duarte Delgado
Orientador: Agostinho Agra
Co-orientador: Domingos Moreira Cardoso
(local seminar) "O diâmetro do politopo de Birkhoff acíclico" (portuguese)
Orador: Liliana Costa, Universidade de Aveiro.
Resumo: Faz-se uma interpretação, segundo a teoria dos grafos, dos vértices
e arestas do politopo de Birkhoff acíclico, Omega_n(T) = Tn, onde T é uma
árvore com n vértices, e generaliza-se um resultado relativo ao diâmetro do
politopo de Birkhoff tridiagonal.
(local seminar) On the linear convergence of Newton-Krylov methods
Título: On the linear convergence of Newton-Krylov methods.
Orador: Gueorgui Smirnov, Professor Associado da Faculdade de Ciências
da Universidade do Porto.
Orador: Gueorgui Smirnov, Professor Associado da Faculdade de Ciências
da Universidade do Porto.
17 de Outubro de 2008 (Departamento de Matemática, sala Sousa Pinto,
11:00-12:00)
(new post-doc) Dra. Agnieszka Barbara Malinowska,
Dr. Agnieszka Barbara Malinowska, Assistant Professor at
the Institute of Mathematics of Bialystok Technical
University, received a Polish post-doc research fellowship
to work in Aveiro under the scientific supervision of
Prof. Delfim F. M. Torres, from October 2008 to December
2010, on "multiobjective optimal control problems" and
related issues.
the Institute of Mathematics of Bialystok Technical
University, received a Polish post-doc research fellowship
to work in Aveiro under the scientific supervision of
Prof. Delfim F. M. Torres, from October 2008 to December
2010, on "multiobjective optimal control problems" and
related issues.
Investigations will be carried out on several topics of
multiple criteria decision making, including the study of
nonessential objective functions and redundant objective
functions of mathematical static optimization programming
and functionals of optimal control theory.
(local seminar) Bodies of zero resistance and bodies invisible in one direction.
Título: Bodies of zero resistance and bodies invisible in one direction.
Orador: Alena Aleksenko, Universidade de Aveiro.
A body in a parallel flow of non-interacting particles is considered.
We introduce the notions of a body of zero resistance, a body
that leaves no trace, and a transparent body, and prove that all such
kinds of bodies do exist.
10/Outubro/2008, Sala Sousa Pinto (DMAt/UA)
Seminário para alunos do 1º e 2º ciclos
1ª parte
Apresentação do Instituto de Matemática e Informática de Vilnus
_________________________________________________________________
2ª parte
Integration of Data Mining Methods for Various Applications
Abstract: Nowadays huge amounts of data have been collected. However
comprehension of these data remains a topic problem so far. It is very
difficult for a human being to make use of such an amount of information and
to be able to find basic patterns, relations, or trends in the data. In such
a manner data become ever less and less valuable. Data mining could be
useful for comprehension of data and help to make decisions. The combination
and integrated use of data mining methods (classification, clustering,
visualisation, etc.) of a different nature are under a rapid development.
The combination of different methods can be applied to make a data analysis,
while minimizing the shortcomings of individual methods.
There are investigated following data mining methods:
- dimension reduction methods (principal component analysis,
multidimensional scaling (MDS), manifold learning);
- artificial neural networks (self-organizing maps (Kohonen maps) (SOM),
combination of SOM and MDS algorithm)
- classification methods (support vector machine (SVM), Naive Bayes, k-NN
classifier, classification tree, rule induction)
The great attention is paid to combination of self-organizing and a special
case of multidimensional scaling – Sammon algorithm. This method is applied
to some problem of a different nature: statistical analysis of curricula,
comparison of schools, and analysis of the economic and social conditions of
Central European countries.
Apresentação do Instituto de Matemática e Informática de Vilnus
_________________________________________________________________
2ª parte
Integration of Data Mining Methods for Various Applications
Abstract: Nowadays huge amounts of data have been collected. However
comprehension of these data remains a topic problem so far. It is very
difficult for a human being to make use of such an amount of information and
to be able to find basic patterns, relations, or trends in the data. In such
a manner data become ever less and less valuable. Data mining could be
useful for comprehension of data and help to make decisions. The combination
and integrated use of data mining methods (classification, clustering,
visualisation, etc.) of a different nature are under a rapid development.
The combination of different methods can be applied to make a data analysis,
while minimizing the shortcomings of individual methods.
There are investigated following data mining methods:
- dimension reduction methods (principal component analysis,
multidimensional scaling (MDS), manifold learning);
- artificial neural networks (self-organizing maps (Kohonen maps) (SOM),
combination of SOM and MDS algorithm)
- classification methods (support vector machine (SVM), Naive Bayes, k-NN
classifier, classification tree, rule induction)
The great attention is paid to combination of self-organizing and a special
case of multidimensional scaling – Sammon algorithm. This method is applied
to some problem of a different nature: statistical analysis of curricula,
comparison of schools, and analysis of the economic and social conditions of
Central European countries.
Short information about the lecturer: Olga Kurasova is a senior researcher
at Institute of Mathematics and Informatics (IMI), Vilnius, Lithuania. She
also is a senior lecturer of Information Technologies Department at Vilnius
Pedagogical University.
E-mail: Kurasova@ktl.mii.lt Homepage:
http://www.mii.lt/index.php?siteaction=personnel.view&id=380 Webpage of IMI:
http://www.mii.lt
DIA 24 DE SETEMBRO, SALA SOUSA PINTO, 15:00 HORAS
(local seminar) "Multiple Objective Linear Fractional Programming Problems"
by Prof. João Paulo Costa, Faculdade de Economia, Universidade de Coimbra
(jpaulo@fe.uc.pt).
The main reason for the interest in and importance of fractional programming
stems from the fact that various problems, ranging from engineering to
economics, consider the optimization of a ratio between physical and/or
economic linear functions.(...)
19 de Setembro de 2008, 11h30.
(jpaulo@fe.uc.pt).
The main reason for the interest in and importance of fractional programming
stems from the fact that various problems, ranging from engineering to
economics, consider the optimization of a ratio between physical and/or
economic linear functions.(...)
19 de Setembro de 2008, 11h30.
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http://ceoc.mat.ua.pt