ceoc

Seminar "Funções Especiais do Cálculo Fraccionário e a Função de Mittag-Leffler com Três Parâmetros"

2009-10-29T13:39:00.002Z

Em 30 de Outubro de 2009, (Departamento de Matemática, sala Sousa Pinto,
11:30-12:30)
Orador: Edmundo Capelas de Oliveira, Departamento de Matemática Aplicada,
Universidade de Campinas, Brasil.
Abstract: Apresentamos uma demonstração formal de um novo teorema envolvendo
a função de Mittag-Leffler com três parâmetros. Como consequência,
recuperamos resultados conhecidos e discutimos um corolário que emerge
naturalmente. Como uma aplicação obtemos a solução de uma equação
diferencial fracionária associada ao circuito elétrico RLC numa forma
fechada envolvendo uma função de Mittag-Leffler com dois parâmetros.

seminar "Eigenvalue statistics of non-Hermitian random"

2009-10-20T18:43:00.001+01:00

22 de Outubro de 2009 (Departamento de Matemática, sala Sousa Pinto,
10:00-11:00)
Boris Khoruzhenko, Queen Mary, University of London.
Abstract: In this talk I intend to discuss generic patterns of the
eigenvalue distribution in the complex plane for Gaussian random matrices
with no symmetry conditions imposed. For such matrices the mean eigenvalue
density and higher order correlation functions can be exactly reduced to
twopoint kernels. This makes it possible to analyse the eigenvalue
distribution in the strongly and weakly non-Hermitian limits of large matrix
size. No previous knowledge of random matrix theory will be assumed.

Seminar "Machine Learning and Neuroscience"

2009-09-28T13:38:00.000+01:00

6 de Outubro, Departamento de Matemática, sala Sousa Pinto, 12:00-13:00

Title: "Machine Learning and Neuroscience*

Speakers: Concha Bielza and Pedro Larrañaga (Universidad Politécnica de Madrid)

Abstract

Reverse-engineer the human brain has been identified by the National Academy of Engineering in 2009 as one of the 14 challenges that will influence science and technology for the next decade. This calls engineers and neuroscientists to work together. As participants of the Blue Brain international project, in this talk we will describe a number of interesting problems where Machine Learning and Neuroscience can collaborate. They are briefly explained below.

*A.* Define distinct populations of neurons in the brain cortex according to electrophysiological, molecular and morphological features.

This involves a supervised classification to distinguish between the common pyramidal neurons and interneurons or an unsupervised classification that discovers new groups of neurons inside these two classes, whose identity remains unclear.

*B.* Construct models that can simulate the huge variety of dendritic morphology, the shape of brain cells. Dendritic branching is poorly understood due to be driven by a complex process but understanding how these trees are formed in the brain, we can learn more about their normal function and why they are often malformed in neurological diseases. Virtual trees can be created by measuring from real cells different parameters controlling branching behaviour. These measures can be modelled as statistical distributions and a global simulation model accounts for all the parameters together.

*C.* Accurately reconstruct (semi-)automatically the 3D structure and connectivity of neurological tissue and label dendrites, axons and synapses unambiguously from electron microscope images that can provide a level of detail never reached before. It requires a huge amount of data to be processed (hundreds of terabytes) where machine learning and image processing techniques have to be combined.

*D.* The technique of functional magnetic resonance imaging (fMRI) provides high-contrast images of neuronal activity indicating variations in oxygen consumption. The source data are 3D pixels (voxels) representing different intensities. With brain images, we can identify regions of the ventral-occipital cortex involved in visual processing of objects or faces and predict neural activation while identifying pictures and words. A visionary approach would be to use fMRI to diagnose neurodegenerative diseases like Alzheimer's. Difficulties arise due to the joint use of clinical data and spatial, temporal and function information.

*E.* In the same spirit, Alzheimer's disease data and results from different -omics (genomics, proteomics, metabolomics) may be integrated into a single research to study the possible influences and interactions among them. These include DNA microarrays, SNP chips, mass spectrometry runs... that when combined, can open a major degree of knowledge discovery for the Alzheimer's disease.

*F.* Identify and solve some classes of optimization problems in neuronal modelling. The difficulty of the problems may lead to use evolutionary computation based on machine learning models. We identify three classes: (1) neuronal parameter optimization, where we search for the parameter values that yield a desired electrical activity pattern in a neuron (or neuronal network); (2) neuronal model selection, where besides the parameters we also optimize some of the structural components of the model (useful when an accurate formulation of the neuronal model is unavailable); and (3) structural optimization problems in brain networks, where a network topology satisfying a number of constraints has to be found. Brain activity can be modelled as a dynamic process acting on a network, with brain areas, groups of neurons or individual cells as vertices. Its topology may be a key element in understanding the behaviour of the process.

(online publication) Isoperimetric problems on time scales with nabla derivatives

2009-04-01T10:01:00.001+01:00

Ricardo Almeida and Delfim F. M. Torres, Isoperimetric problems on time
scales with nabla derivatives, Journal of Vibration and Control 2009,
doi:10.1177/1077546309103268

[Seminarios-CEOC] CONNECTED GRAPHS OF FIXED ORDER AND SIZE WITH MAXIMAL Q-INDEX: SOME SPECTRAL BOUNDS.

2009-03-10T15:30:00.001Z

Orador: Milica Anđelić, Universidade de Aveiro.
The Q−index (or spectral radius) of a simple graph is the largest eigenvalue of its signless Laplacian matrix. There are many results in the literature where, for some fixed class of graphs, all graphs whose index is maximal are identified. For connected graphs of fixed order and size this problem is not yet completely resolved (in contrast to the more general class when connectivity is not required). It is only known (for a long time) that the graphs with maximal Q−index in the former class (and the latter one) are the nested split graphs.
Focusing our attention on eigenvector techniques we got some new (lower and upper) bounds on the Q−index of nested split graphs.
2000 Mathematical Subject Classification: 05C50
Key words and phrases: signless Laplacian spectrum, largest eigenvalue,
spectral radius, graph Q−index, spectral bounds.
13 de Março de 2009, 11:30 - 12:30 - Sala Sousa Pinto, DMat, Universidade de Aveiro

(dissertação de mestrado) Computação no Cálculo das Variações

2009-03-05T15:26:00.002Z

A aluna Célia Teresa Ligeiro Mendes Pereira defendeu com sucesso a sua dissertação
orientada por João Pedro Cruz e Delfim F.M. Torres em 05/Março/2009.

(regular seminar) eXVisXML, uma ferramenta emblemática na análise documental

2009-03-03T14:42:00.001Z

Oradores: Pedro Henriques e Daniela da Cruz, Departamento de Informática,
Univ. do Minho
A análise de documentos estruturados, como é o caso dos documentos anotados
em XML, é fundamental para a sua compreensão que é requerida em todas as
tarefas de manutenção e reutilização. A manutenção é exigida no dia-a-dia
para corrigir defeitos, precaver problemas e adicionar funcionalidades. A
reutilização mostra-se relevante para economia de custos e rentabilização.
(...)
6 de Março de 2009, (Departamento de Matemática, sala Sousa Pinto,
11:30-12:30)

(local seminar) Report on my recent visit to Acoustics Research

2009-02-26T10:08:00.001Z

Evgeny Lakshtanov, Univ. de Aveiro
Abstract: Recently I had a short scientific visit to the acoustics research
institute in Vienna. My objective was to communicate
with mathematicians who work closely with sound engineers in order to pick
up some statements of interesting mathematical problems. During this talk I
intend to share the results of this experience.
27 de Fevereiro de 2009, (Departamento de Matemática, sala Sousa Pinto,
11:30-12:30)

(regular seminar) An asymptotic approach to conjugate time for bangbang

2009-02-17T09:44:00.001Z

Orador: Cristiana J. Silva, Univ. de Aveiro.
Resumo: We focus on the minimal time control problem for
single-input control-affine systems dx/dt = X(x) + u1 Y1(x) in Rn, where the
scalar control u1 fulfills the constraint |u1()|=<1.
We recall the concept of conjugate time for the bang-bang case in these
systems and propose an asymptotic approach, based on a penalized procedure,
which allows the application of the well-known results (theoretical and
practical) on the conjugate times for the smooth case into the bang-bang
case.
SEMINÁRIO - 20 de Fevereiro de 2009 (Departamento de Matemática, sala Sousa
Pinto, 11:30-12:30)

(computer application) A Computational Approach to Essential and Nonessential Objective Functions in Linear Multicriteria Optimization

2009-01-29T12:08:00.001Z

Agnieszka B. Malinowska and Delfim F. M. Torres, A Computational Approach to
Essential and Nonessential Objective Functions in Linear Multicriteria
Optimization, Application Type: Maple Worksheet; Publish date: December,
2008; Published by: Maplesoft, a division of Waterloo Maple Inc.
http://www.maplesoft.com/applications/app_center_view.aspx?AID=2374

The Control Theory Group (cotg)

2009-01-28T21:47:00.001Z

The Control Theory Group (cotg)
receives two new post-docs beginning March 1, 2009:

1) Dr. Ewa Pawluszewicz,
Assistant Professor at the Institute
of Mathematics of Bialystok Technical University, Poland,
Programa da FCT Ciência 2007,
(Concurso Internacional para a Contratação de 1000 Doutorados
para Instituições Científicas Portuguesas, referência C2007-UA/CEOC/03),
Title of the working programme: Control Theory on Time Scales.
Responsible: Delfim F. M. Torres

2) Dr. Ewa Girejko,
Post-doctoral Grant from FCT: SFRH/BPD/48439/2008
Title of the working programme:
Generalized differentials in dynamical inclusions
on time scales and optimal control
Responsible: Delfim F. M. Torres

(seminar) Calculus of Variations on Time Scales,

2009-01-25T11:48:00.000Z

Delfim F. M. Torres, Calculus of Variations on Time Scales,
Seminários de Matemática,
Seminário de Análise, Geometria e Física-Matemática,
Universidade do Minho, Campus de Gualtar, Braga,
22 de Janeiro de 2009.

(publication) Existence of solutions to a "water-oil" system

2009-01-20T10:10:00.001Z

M. R. Sidi Ammi, Existence of solutions to a "water-oil" system, PAMM,
Volume 7, Issue 1 , Pages2040081 - 2040082 Copyright C 2007 WILEY-VCH Verlag
GmbH & Co. KGaA, Weinheim
(http://www3.interscience.wiley.com/journal/121560471/abstract)
Published Online: Dec 12 2008 7:37AM
DOI: 10.1002/pamm.200701109

invited talk: "Transversality conditions in the calculus of variations on time scales"

2009-01-13T16:55:00.001Z

Agnieszka B. Malinowska will give an invited talk at the conference PROGRESS
ON DIFFERENCE EQUATIONS 2009 (PODE09), CONFERENCE IN HONOUR OF PROFESSOR
GERASIMOS LADAS, entitled
Transversality conditions in the calculus of variations on time scales
PODE09 conference will take place in The Mathematical Research and
Conference Center in Bedlewo, Poland, from May 25th to May 29th 2009.
The conference will be locally supported by Stefan Banach International
Mathematical Center, and by Poznan University of Technology.
The proceedings of PODE09 will be published as a special issue of FASCICULI
MATHEMATICI.

invited talk at the conference PROGRESS ON DIFFERENCE EQUATIONS 2009

2009-01-13T12:20:00.001Z

Delfim F. M. Torres will give an invited talk at the conference PROGRESS ON
DIFFERENCE EQUATIONS 2009 (PODE09), CONFERENCE IN HONOUR OF PROFESSOR
GERASIMOS LADAS, entitled
Unifying the Unifiable Calculus of Variations on Time Scales
PODE09 conference will take place in The Mathematical Research and
Conference Center in Bedlewo, Poland, from May 25th to May 29th 2009.
The conference will be locally supported by Stefan Banach International
Mathematical Center, and by Poznan University of Technology.
The proceedings of PODE09 will be published as a special issue of FASCICULI
MATHEMATICI.

(Project) Approximate Resolution of Geometric Optimization Problems

2009-01-07T17:25:00.001Z

Project approved from "Acções Integradas Luso-Espanholas, 2009-2010"
coordinated by Belen Palop (Universidad de Valladolid) and António Leslie
Bajuelos (Universidade de Aveiro).

CEOC obteve "Very Good" na avaliação de 2007

2008-12-18T11:51:00.001Z

Os resultados das várias UI&D portuguesas encontram-se aqui:
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.

6th Iberian Workshop on Computational Geometry

2008-12-16T14:30:00.004Z

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...

Encontro CEOC-CIMA 2008

2008-12-05T16:45:00.000Z

Mais detalhes em:
http://ceoc.mat.ua.pt/meetings/ceoc-cima2008/index.html

Lecture at foreigner university: Scattering by obstacles

2008-12-02T09:25:00.000Z

Evgeny Lakshtanov will give an invited lecture in Mathematics Institut in
Munique.
http://www.mathematik.uni-muenchen.de/~lerdos/os0809/

Recent publications and communications from Tatiana Tchemisova (CEOC Member)

2008-11-27T11:28:00.001Z

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.

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

2008-11-25T16:12:00.002Z

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.

Computer Application available from the Maple Application Centre

2008-11-21T11:01:00.001Z

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

(local seminar) Rotas Seguras usando a 2-cobertura

2008-11-19T17:04:00.001Z

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)

(course) "Numerical issues in semi-infinite programming and applications"

2008-11-17T15:46:00.000Z

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.

(local seminar)Reconhecimento de grafos hamiltonianos com recurso

2008-11-11T19:02:00.001Z

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

2008-11-08T15:07:00.001Z

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

(local seminar) Reconhecimento de grafos hamiltonianos com recurso a técnicas espectrais

2008-11-05T10:29:00.001Z

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.

(local seminar) "Turing machine and Cellular Automata for primary school"

2008-11-01T16:06:00.001Z

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.

(new PhD Thesis) "Modelação e optimização da distribuição de combustíveis e gestão portuária em Cabo Verde"

2008-10-21T16:59:00.001+01:00

(in Portugese)
Aluno: Alexandrino Duarte Delgado
Orientador: Agostinho Agra
Co-orientador: Domingos Moreira Cardoso

(local seminar) "O diâmetro do politopo de Birkhoff acíclico" (portuguese)

2008-10-21T16:47:00.001+01:00

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

2008-10-14T18:13:00.001+01:00

Título: On the linear convergence of Newton-Krylov methods.
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,

2008-10-09T17:07:00.001+01:00

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.

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.

2008-10-08T18:37:00.001+01:00

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

2008-09-23T14:57:00.001+01:00

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.

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"

2008-09-17T09:01:00.001+01:00

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.

(local seminar)"Minesweeper"without a computer

2008-09-10T15:41:00.001+01:00

How can we play "Minesweeper" without a computer?
It is shown that certain configurations of open cells guarantee the
existence and the uniqueness of the solution. Moreover, we propose an
algorithm for automatic generation of the initial table.
Evgeny Lakshtanov, Pós-Doc da UA, lakshtanov@rambler.ru.
(12 de Setembro de 2008)

(talk given in seminar) "Constantin integral inequalities on time scales"

2008-09-05T09:39:00.001+01:00

Title: Constantin integral inequalities on time scales
Speaker: Rui A. C. Ferreira (PhD student of the University of Aveiro)
Date: 3/September/2008
Place: Department of Mathematics and Statistics Missouri University of
Science and Technology Rolla, Missouri 65409-0020, USA
Abstract: It is well known that integral inequalities can be applied in many
branches of mathematics.
A. Constantin used an inequality and a topological transversality theorem to
prove the existence of a solution of a differential equation. This
inequality was then generalized and it was given a discrete analogue also.
Here, we prove that that inequality still remains true on a general time
scale. Moreover, we generalize it further, even if the time scale is the set
of the real numbers. Some sharpness issues of the inequality are also
discussed.

(article to appear) "Diamond-alpha Integral Inequalities on Time Scales"

2008-09-03T08:47:00.001+01:00

Title: Diamond-alpha Integral Inequalities on Time Scales
Authors: Rui A. C. Ferreira, Moulay Rchid Sidi Ammi, Delfim F. M. Torres
is accepted for International Journal of Mathematics and Statistics (IJMS),
Special Issue "Generalized Differentiation, Variational Analysis and
Mathematical Control Theory -- a 60th Birthday Tribute to Boris S.
Mordukhovich", Editors: Delfim F. M. Torres and Alexander J. Zaslavski.
Papers are scheduled to appear in Vol. 5, No. A09, 2009

Delfim F. M. Torres is Invited Speaker at I.C. "Calculus of Variations and Applications: from Engineering to Economy"

2008-09-02T18:43:00.001+01:00

Delfim F. M. Torres is Invited Speaker at the
International Conference "Calculus of Variations and
Applications: from Engineering to Economy", that takes
place at the Universidade Nova de Lisboa, from 8th to 10th
September 2008.
Information about the conference at
http://ferrari.dmat.fct.unl.pt/cva2008/
Abstract of Torres talk: "Recent Results on the Calculus
of Variations on Time Scales" at
http://ferrari.dmat.fct.unl.pt/cva2008/torres.pdf

(published article) "Relaxed optimality conditions for mu-differentiable functions"

2008-09-02T18:39:00.001+01:00

Ricardo Almeida and Delfim F. M. Torres, Relaxed
optimality conditions for mu-differentiable functions,
Int. J. Appl. Math. Stat. Vol. 14, No. M09, 2009, pp.
53--66.

Delfim F. M. Torres was member of the Scientific Committee

2008-09-02T18:38:00.001+01:00

Delfim F. M. Torres was member of the Scientific Committee
of
"The International Conference of Differential Geometry and
Dynamical Systems" (DGDS-2008) and "The V-th International
Colloquium of Mathematics in Engineering and Numerical
Physics" (MENP-5), that took place in Mangalia, Romania,
August 29 - September 02, 2008.

Visit of Prof. Irene Sciriha

2008-09-02T00:25:00.001+01:00

Visit of Prof. Irene Sciriha, Department of Mathematics, Faculty of Science, University of Malta, September 1-6, 2008.

The scientific program includes: Working sessions on the study of singular graphs and its relations with graphs having (k,k)-regular sets. Also the preparation of paper on regular subgraphs of singular graphs, a joint work with Cheryl Zerafa, post graduate student at University of Malta, Irene Sciriha and D M Cardoso.

A seminar: “Characterization of singular graphs”, I. Sciriha, Sept. 5, 2008.

Book announcement Mathematical Control Theory and Finance

2008-08-29T16:42:00.001+01:00

Mathematical Control Theory and Finance
Sarychev, A.; Shiryaev, A.; Guerra, M.; Grossinho, M.d.R.
(Eds.)
2008, XIV, 420 p. 41 illus., Hardcover
ISBN: 978-3-540-69531-8

http://www.springer.com/978-3-540-69531-8

Anúncio para atribuição de Bolsas de Integração na Investigação (BII)

2008-08-01T11:19:00.001+01:00

Encontra-se aberto concurso para a atribuição de 5 Bolsas de Integração na
Investigação (BII) a estudantes do 1º ciclo do ensino superior com bom
desempenho escolar, inscritos em instituições nacionais do ensino superior
público ou privado.

Consulte http://ceoc.mat.ua.pt/bolsas/bii2008

5-years research position

2008-07-31T21:05:00.002+01:00

The Centre for Research on Optimization and Control (CEOC), within the Department of Mathematics of University of Aveiro (http://www.ua.pt/), Portugal, invites applications for one 5-years research position in one of the following topics: Algebraic Graph Theory, Combinatorial Optimization or Computer Science.

The contract for this position is for one year minimum extendable to five years, equivalent to the index 195 of the Portuguese State research positions, corresponding to 3 038x14 = 42 532 euros per year. The candidates must have a PhD in mathematics with at least three years of experience in one of the above research topics. Furthermore, the candidates should be fluent in English. The successful candidate will develop his research activities at CEOC (http://ceoc.mat.ua.pt/).

Enquires about the position can be addressed to Domingos M Cardoso (dcardoso@ua.pt)

Deadline for applications: September 30 2008

Selecting Committee:

Domingos M Cardoso (University of Aveiro)
Dragos Cvetkovic (Serbian Academy of Sciences and Arts)
Franz Rendl (University of Klagenfurt)
Andrey Sarychev (University of Florence)
Jerzy Szymanski (Adam Mickiewicz University

More information can be obtained at: http://www.eracareers.pt/opportunities/index.aspx?task=global&jobId=10649

Obtenção de Limites Inferiores para Problemas de Desenho de Redes

2008-07-29T10:39:00.001+01:00

(published M.Sc. dissertation) Mónica Ferreira de Jesus: "Obtenção de Limites
Inferiores para Problemas de Desenho de Redes" (supervised by Cristina
Requejo), University of Aveiro, 2008.

Quality Illumination: Some Problems and Results

2008-07-23T14:19:00.010+01:00

(talk) Antonio L. Bajuelos: "Quality Illumination: Some Problems and Results";, X Spanish Seminar on Discrete Mathematics", Valladolid, Spain, 9-11 September,2008.

Algumas variantes do problema de iluminação de qualidade

2008-07-23T14:19:00.009+01:00

(published M.Sc dissertation) Cristina Pires: "Algumas variantes do problema de iluminação de qualidade",(supervised by Antonio L. Bajuelos), University of Aveiro, 2008.

Centre for Research on Optimization and Control

2008-07-23T14:02:00.000+01:00

This is a blog at blogspot created by Pedro Cruz in 23/07/2008.