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2010

Research Seminars at Foreign Institutions (1 occurrences)

1  E. A. Martins (with Domingos M. Cardoso, I. Gutman and M. Robbiano) “A Generalization of Fiedler’s Lemma and some applications”, Universidade Federal do Rio de Janeiro, Brasil, 3 February,2010.

2009

International Conferences (40 occurrences)

1   ICDEA 2009, International Conference on Difference Equations and Applications, Lisbon, Portugal, October 19--23, 2009 (contributed talk entitled Calculus of Variations with Discrete Fractional Derivatives).

2  "A. Agra and M. Constantino, "Mixing Polyhedra with Non-Divisible Coefficients", MIP2009, Berkeley, USA, 2009

3  "An asymptotic approach to conjugate time for bang- bang problems", 14th Belgian-French-German Conference on Optimization, September 14--18, 2009, Leuven, Belgium.

4  "An asymptotic approach to conjugate time for bang-bang problems", Workshop on Control, Nonsmooth Analysis and Optimization, Celebrating Francis Clarke's and Richard Vinter's 60th birthday, May 4--8, 2009, Porto, Portugal.

5  "Maximum Covered Path within a Region". XIII Encuentros de Geometría Computacional (XIII EGC), Universidad de Zaragoza, Spain, June 2009.

6  "Safe Routes on a Street Graph with Minimum Power Transmission Range", 25th European Workshop on Computational Geometry, Brussels, Belgium, March 2009

7  19-21, November 2009:Second Meeting on Optimization Modelization and Approximation, Hassania School Public works (Ecole Hassania des Travaux Pubilcs) in Casablanca, Morroco.

8  2nd Meeting on Optimization Modelization and Approximation, November 19-21, 2009 - Casablanca, Morocco; Transversality Conditions for Infinite Horizon Variational Problems on Time Scales.

9  Application of Time Scale Calculus to Control Systems, Conf.: Progress on Difference Equations PODE’2009, May 25-29, 2009, Bedlewo, Poland

10  Avoidence Control on Time Scales, International Conference on Difference Equations and Applications, October 19 - 23, 2009, Estoril, Portugal

11  C. Requejo, A. Agra, L. Gouveia. Extended formulations for the cardinality-constrained subtree of a tree problem. INOC 2009. Pisa, Italy, 26-29 April, 2009

12  Calculus of variations on time scales with delta, nabla and directional derivatives, Ewa Girejko, Agnieszka Malinowska and Delfim F. M.Torres, 15th International Conference on Difference Equations and Applications, October 19 - 23, 2009, Estoril, Portugal

13  Contingent epiderivatives of functions on time scales, E. Girejko, D.Mozyrska and M. Wyrwas, Workshop in Control, Nonsmooth Analysis and Optimization, May 4 - 8, 2009, Porto, Portugal

14  Dorota Mozyrska and Delfim F. M. Torres, Controllability of fractional linear control systems with commensurate orders of the Riemann-Liouville Derivative, Instytut Automatyki, Politechnika Lódzka, Poland, 26 June 2009.

15  Dorota Mozyrska and Delfim F. M. Torres, Modified Energy Control in the Memory Domain of Fractional Continuous-Time Linear Control Systems, Minsk, Belarus, October 2009.

16  Dorota Mozyrska and Delfim F. M. Torres, Modified energy control in the memory domain of fractional continuous-time linear control systems, Symposium on Fractional Signals and Systems, Universidade Nova de Lisboa, 4-6 November 2009.

17  Dorota Mozyrska and Delfim F. M. Torres, On controllability of fractional linear control systems with commensurate order of the Caputo derivatives Workshop in Control, Nonsmooth Analysis and Optimization, Celebrating Francis Clarke's and Richard Vinter's 60th birthday, Porto, May 4-8, 2009.

18  E. A. Martins. "Counting vertices and edges of a Birkhoff polytope for trees" (with L. Costa and C. M. da Fonseca) DIMAP workshop on Algorithmic Graph Theory , University of Warwick de 23-25 March

19  E. Lakshtanov. " Spectral Properties of the Dirichlet-To-Neumann Operator for Exterior Helmholtz Problem and Its Applications to Scattering Theory", The 9th International Conference on Mathematical and Numerical Aspects of Waves Propagation, June 2009, Pau, France.

20  Graphs With Convex Quadratic Stability Number com Domingos M. Cardoso, 23rd European Conference on Operational Research, Bonn - Alemanha, 5 - 8 Julho, 2009

21  Graphs With Convex Quadratic Stability Number, com Domingos M. Cardoso, ICNAAM 2009, International Conference on Numerical Analysis and Applied Mathematics, Creta - Grécia, 18-22 Setembro 2009

22  Helena Sofia Rodrigues, M. Teresa Torres Monteiro and Delfim F. M. Torres, Optimal Control with Nonlinear Programming, EURO XXIII Conference, EURO Conference 2009 in Bonn, 23rd European Conference on Operational Research, Bonn, July 5 - 8, 2009

23  Helena Sofia Rodrigues, M. Teresa Torres Monteiro and Delfim F. M. Torres, Optimization of Dengue Epidemics: a test case with different discretization schemes, 7th International Conference of Numerical Analysis and Applied Mathematics (ICNAAM 2009), Rethymno, Crete, Greece, 18-22 September 2009.

24  Input-Output Equivalence Transformations for Implicit Nonlinear Systems on Time Scales, Workshop on Control, Nonsmooth Analysis and Optimization, May 4-8, 2009, Porto, Portugal

25  J. S. Esteves, "An Algorithm for the Bicriterion Call Centers Staffing Problem", 7th EUROPT Workshop "Advances in Continuous Optimization", Remagen, Germany, July 3-4, 2009.

26  J. S. Esteves, "The Bicriterion Call Centers Dimensioning Problem", 6th International Conference on Computational Management Science, Geneve, Switzerland, May 1-3, 2009.

27  J. S. Esteves, "The Call Centers Staffing Problem: A Multicriterion Approach", XXIII EURO (European Conference on Operational Research), Bonn, Germany, July 5-8, 2009.

28  J. S. Esteves, “Algorithms for Higher-Order Derivatives of Erlang C Function”, Best Talk Award of the 13th WSEAS (World Scientific and Engineering Academy and Society) International Conference on Communications, Rhodes Island, Greece, July 22-25, 2009.

29  Jorge Sá Esteves. "The Bicriterion Call Centers Dimensioning Problem". CMS2009 - 6th International Conference on Computational Management Science; Geneve, Switzerland; May, 1-3, 2009

30  Milica Andjelic. "Combinatorial properties of graphs with (k,t)-regular star set" IPM - International Workshop on Combinatorics 2009, IPM, Tehran, IRAN

31  Nuno Bastos (with Delfim Torres and Rui Ferreira), Necessary Optimality Conditions for Fractional Difference Problems of the Calculus of Variations, Workshop in Control, Nonsmooth Analysis and Optimization, Celebrating Francis Clarke's and Richard Vinter's 60th birthday, Porto, May 4-8, 2009.

32  Nuno Bastos (with Delfim Torres and Rui Ferreira), The Fractional Difference Calculus of Variations, Symposium on Fractional Signals and Systems'09 in Lisbon, Portugal, from November 4th to November 6th 2009

33  Subdifferentials of convex functions on time scales, M. Wyrwas, D.Mozyrska and E. Girejko, Workshop in Control, Nonsmooth Analysis and Optimization, May 4 - 8, 2009, Porto, Portugal

34  The 20th International Symposium of Mathematical Programming (ISMP), Chicago, Illinois, USA, August 23 - 28 2009; Natural Boundary Conditions in the Calculus of Variations.

35  Uniform differentiability and critical points II, Logic and Math, Univ. of York, August 3rd to 7th

36  WCNAO, Porto 4-8 maio 2009, "Necessary and sufficient conditions for problems of the calculus of variations with fractional derivatives" (com Delfim Torres)

37  Workshop on Control, Nonsmooth Analysis and Optimization, Porto, Portugal, May 4-8, 2009; Euler-Lagrange equations for composition functionals of the calculus of variations on time scales.

38  Zbigniew Bartosiewicz, Natália Martins and Delfim F. M. Torres, Dubois-Reymond Equation and Noether's Theorem in Calculus of Variations on Time Scales, Progress on Difference Equations 2009 (PODE09), Conference in Honour of Professor Gerasimos Ladas, The Mathematical Research and Conference Center in Bedlewo, Poland, from May 25th to May 29th 2009.

39  The Second Euler-Lagrange Equation of Variational Calculus on Time Scales'' (with Delfim F. M. Torres and Zbigniew Bartosiewicz) Workshop on Control, Nonsmooth Analysis and Optimization, University of Porto, Portugal, 4-8 May 2009.

40  “EURO XXIII”, conferência realizada entre 4 e 9 de Julho em Bona, Alemanha; apresentou a comunicação “An upper bound on the 2-club number of a graph”.

National Conferences (14 occurrences)

1  "Smooth regularization of bang-bang optimal control problems", 5-th meeting CIMA-CEOC, Évora, December 18–19, 2009.

2  Análise Não Linear em Dimensão Infinita, SPIMNS Setembro de 2006, Univ. de Aveiro

3  C. Requejo. Comparação de heurísticas para o problema da gestão óptima da diversidade. Joint work with A. Agra, J. Orestes Cerdeira. IO2009, Caparica, 7-9 Setembro, 2009

4  C. Requejo. Genetic algorithm for the design of survivable optical transport networks: operators comparison. Joint work with R.Morais, C. Pavan, A. Nolasco Pinto. IO2009, Caparica, 7-9 Setembro, 2009

5  Composition functional in calculus of variations on time scales; Seminário de Análise, Geometria e Física-Matemática, Departamento de Matemática, Universidade do Minho, Portugal, 26 March 2009.

6  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, Janeiro de 2009.

7  Delfim F. M. Torres, Cálculo das Variações em Escalas Temporais, Seminário da linha de Estatística, Inv. Operacional \& Controlo do Centro de Matemática da UTAD (CM-UTAD), Universidade de Trás os Montes e Alto Douro, Vila Real, October 28, 2009.

8  Delfim F. M. Torres, Cálculo em time scales, Seminário do Programa Doutoral em Matemática e Aplicações das Universidades de Aveiro e Minho, Braga, Janeiro de 2009.

9  Delfim F. M. Torres, Interligação de Problemas de Controlo Óptimo com Programação Não-Linear, Seminário do Programa Doutoral em Matemática e Aplicações das Universidades de Aveiro e Minho, Braga, Janeiro de 2009.

10  Graphs With Convex Quadratic Stability Number com Domingos M. Cardoso, 23rd European Conference on Operational Research, Bonn - Alemanha, 5 - 8 Julho, 2009 Reconhecimento de Grafos com Número de Estabilidade Quadrático Convexo com Domingos M. Cardoso, IO2009, 14º Congresso Nacional da APDIO, FCT-UNL, Monte da Caparica, 7 - 9 de Setembro, 2009

11  J. S. Esteves, “Partilha de Carga Bicritério entre Filas de Espera do tipo Erlang-C”, IO'2009, 14.º Congresso da APDIO, Universidade Nova de Lisboa, Monte da Caparica, 7-9 de Setembro de 2009.

12  Nuno Bastos (with Delfim Torres and Rui Ferreira), Discrete-Time Fractional Variational Problems, 5º Encontro Anual CEOC-CIMA, Departamento de Matemática da Universidade de Évora, 18-19 de Dezembro de 2009.

13  Nuno Bastos (with Delfim Torres and Rui Ferreira), "Necessary Optimality Conditions for Fractional Difference Problems of the Calculus of Variations.", Departamento de Matemática da Universidade de Aveiro, 17 de Abril de 2009

14  Sobre diferenciação em termos não standard, Seminário Portugês Itinerante de Matemática Não Standard, IST, 20 e 21 de Novembro

Invited Talks at International Conferences (11 occurrences)

1  "On the DuBois-Reymond equation on time scales" (with Delfim F. M. Torres and Zbigniew Bartosiewicz), 2009 Mathematical Programming Symposium , August 23-29, 2009, Chicago, USA.

2  "Transversality Conditions for Infinite Horizon Variational Problems on Time Scales" (with Delfim F. M. Torres and Agnieszka B. Malinowska), CNMAC 2009, "Brazilian Computational and Applied Mathematics Conference", Cuiabá, Brasil, September 8-11, 2009.

3  Delfim F. M. Torres, Invited Plenary Speaker (1 hour talk), The second international Meeting on Optimization, Modeling, and Approximation (MOMA'09), November 19-21, 2009 -- Casablanca, Morocco. Talk: The Variational Calculus on Time Scales: a survey.

4  Delfim F. M. Torres, Invited Speaker at the conference Progress on Difference Equations 2009 (PODE09), Conference in Honour of Professor Gerasimos Ladas, The Mathematical Research and Conference Center in Bedlewo, Poland, May 25th to May 29th 2009. Invited Talk: Unifying the Unifiable Calculus of Variations on Time Scales

5  Delfim F. M. Torres, Invited talk "Calculus of variations with fractional derivatives and fractional integrals" in the invited session "Control, Optimization and Calculus of Variations", Brazilian Conference on Computational and Applied Mathematics, September 8--11, 2009, Cuiabá, Brazil.

6  Delfim F. M. Torres, Invited talk "Calculus of variations on time scales with delta-nabla iterated integrals", cluster "Variational Analysis", The 2009 Mathematical Programming Symposium, August 23-29, 2009, Chicago, USA.

7  Delfim F. M. Torres, “Transversality conditions in the calculus of variations on time scales”, Mathematical Research and Conference Center in Bedlewo, Poland, from May 25th to May 29th 2009

8  Domingos M. Cardoso and Peter Rowlinson, "Graph eingenvalues and upper bounds on the order of k-regular induced subgraphs," XIX Congreso de Matematica Capricornio - COMCA 2009, Universidade Catolica del Norte, Antofagasta, Chile, 5-7 Agust.

9  Domingos M. Cardoso and Sofia J. Piinheiro, "Spectral upper bounds on the size of k-regular induced subgraphs," Workshop on Algorithmic Graph Theory, University of Warwick, 23-25 March.

10  E. A. Martins -“Birkhoff polytope for trees” (with L. Costa and C. M. da Fonseca) Congresso de Matemática Capricórnio 2009 (COMCA 2009), Universidade Católica del Norte, Antofagasta, Chile,special session in “Spectral grapgh theory and matrices”, 5-7 August

11  Progress on Difference Equations 2009 (PODE2009), Conference in Honour of Professor Gerasimos Ladas, Bedlewo, Poland, from May 25th to May 29th 2009; Transversality conditions in the calculus of variations on time scales.

Invited Talks at National Conferences (1 occurrences)

1  Domingos M. Cardoso , "A natureza combinatória de muitos problemas práticos," 1as Jornadas de Física e Matemática do ISEC, Coimbra, 14 de Janeiro.2009

Research Seminars at Foreign Institutions (21 occurrences)

1  "Minesweeper and spectrum of discrete Laplacians", 21 oct, 2009 , Mathematics and statistics department, Univ. of North. Caroline, Charlotte, USA

2  "Scattering by Obstacles with Impedance Boundary Condition", Scattering Theory Seminar, department of mathematical sciences, Univ. of Delaware, Delaware, USA, 23 Oct, 2009

3  "Scattering by obstacles with impedance boundary conditions", Northeastern University, Analysis-Geometry Seminar, 16 Oct, Boston, USA

4  "Smooth regularization of bang-bang optimal control problems", Seminar of Dipartimento di Matematica Applicata "G. Sansone", University of Florence, Italy, October 27th, 2009.

5  "Transport Cross Section minimization in problems of wave diffraction", Andreyev Acoustics institute, Moscow, Aug. 2009

6  Closing the gap in mixed integer programs: a polyhedral description and an application, CORE SEMINAR, Louvain-La-Neuve, 8-12-2009

7  Delfim F. M. Torres, A combined approach to the theory of calculus of variations on time scales, 28 August 2009, Department of Mathematical Sciences, Northern Illinois University, USA

8  Delfim F. M. Torres, About different approaches to the theory of Calculus of Variations on Time Scales, Le Groupe de Travail de L'Equipe Commands (INRIA-ENSTA-CMAP-CNRS), Centre de Mathématiques Appliquées, Ecole Polytechnique, Palaiseau, Paris, France June 12, 2009

9  Delfim F. M. Torres, African Institute of Mathematical Sciences (AIMS), Cape Town, South Africa (several talks), March 2009

10  Delfim F. M. Torres, African University of Science and Technology (AUST), Abuja, Nigeria (several talks), February 2009

11  Delfim F. M. Torres, Calculus of Variations on Time Scales, Analysis seminar, Analysis/PDE group, Mathematics Department, September 2009, The University of Texas at Austin, USA

12  Delfim F. M. Torres, Cálculo das Variações em diferentes escalas temporais, Universidade Eduardo Mondlane, Maputo, Moçambique, April 2009

13  Delfim F. M. Torres, On the Calculus of Variations on Time Scales, Université d'Orléans, Laboratoire MAPMO, Orléans, France, June 18, 2009

14  Delfim F. M. Torres, Tudo sob controlo, Universidade Pedagógica, Maputo, Moçambique, April 2009

15  Domingos M. Cardoso , "Conjuntos parcialmente ordenados, polinómios cromáticos e Sudoku," Colóquio de Matemática, Universidade do Minho, Braga, 19 de Janeiro.2009

16  Domingos M. Cardoso, "Convex quadratic techniques for optimization in graphs – a survey, " Seminário de Optimización do Centro de Modelamiento Matematico (CMM), Universidade do Chile, Santiago de Chile, Agust 29.

17  E. A. Martins, “Face Counting on an acyclic Birkhoff polytope” (with L. Costa and C. M. da Fonseca) Centro de Modelamiento Matemático, Faculdade de Física e Ciências Matemáticas, Universidade do Chile, Santiago do Chile, 31 July

18  Natural Boundary Conditions in the Calculus of Variations; Seminar of Analysis and Applied Mathematics Group, Department of Mathematics, University of Texas , USA, 16 September 2009.

19  Pedro Cruz, Delfim F. M. Torres and Alan Zinober, A New Non-Classical Class of Optimal Variational Problems, Applied Mathematics Colloquium, Sheffield, UK, 25th November 2009.

20  Vítor Neves. Diferenciabilidade em espaços localmente convexos II. 6/7 de Janeiro de 2009 (Univ. de Évora).

21  Vítor Neves. Análise global a la Peter Michor, um enquadramento. 20/21 de Novembro de 2009 (IST)

2008

International Conferences (20 occurrences)

1  "The alpha-Embracing Contour", 2008 International Conference on Computational Science and Its Applications (ICCSA 2008), Perugia, Italy, July 2008.

2  26-28, July 2008: International Symposium on mathematical and numerical methods in fluid mechanics, Faculté des Sciences et Techniques, Errachidia, Morocco.

3  Alena Aleksenko, "Newton's problem of minimal resistance in the class of solids of revolution" 8TH INTERNATIONAL CONFERENCE, COMPUTATIONAL AND MATHEMATICAL METHODS IN SCIENCE AND ENGENEERING, June 13-16, 2008, La Manga del Mar Menor, Murcia, Spain

4  Alena Aleksenko, High frequency limit of the Transport Cross Section in scattering by an obstacle with impedance boundary condition, Analysis, PDEs and Applications on the occasion of the 70th birthday of Vladimir Maz'ya, Roma, June 30 - July 3, 2008

5  Ana M. Martins: "Estimating the Maximum Hidden Vertex Set in Polygons", ICCSA 2008 (Workshop on Computational Geometry and Applications), 29/June – 2/July, 2008

6  Ana M. Martins: "Hiding Points in Polygons Using Metaheuristics", 5th Iberian Workshop on Computational Geometry, 7-9 February, 2008

7  C. Requejo, A. Agra, L. Gouveia. The cardinality-constrained subtree of a tree problem. INFORMS-Telecom 2008. Washington, U.S.A., 27-29 March, 2008

8  E. A. Martins- "Bounding the Largest Eigenvalue of some Weighted Graphs", (with R. Fernandes and H. Gomes) SGT- in-Rio: Workshop on Spectra Graph Theory with applications on Computer Science, Combinatorial Optimization and Chemistry, 1-4 December

9  E. A. Martins- "On Spectra of Some Graphs like Weighted Rooted Trees", (with R. Fernandes and H. Gomes) 15 th Conference of International Linear Algebra Society Cancun-México 16 - 20 de June

10  E. Lakshtanov, "Turing machine and Cellular automata for primary school pupils" 8TH INTERNATIONAL CONFERENCE, COMPUTATIONAL AND MATHEMATICAL METHODS IN SCIENCE AND ENGENEERING, June 13-16, 2008, La Manga del Mar Menor, Murcia, Spain

11  E. Lakshtanov, "Upper bounds for Total Cross Section in scattering by an obstacle with impedance boundary conditions" 8TH INTERNATIONAL CONFERENCE, COMPUTATIONAL AND MATHEMATICAL METHODS IN SCIENCE AND ENGENEERING, June 13-16, 2008, La Manga del Mar Menor, Murcia, Spain

12  Figueiredo, R. M. V. ; Labbé, M. ; Mauttone, A. . A Tabu Search approach to solve the mixed integer bilevel formulation of a network design problem. International Symposium on Combinatorial Optimization 2008, 2008, Coventry.

13  Guerra, M.; Sarychev, A.: International Conference "Differential Equations and Topology" dedicated to the Centennial Anniversary of L. S. Pontryagin. Moscow, Russia, June 17-22 2008

14  Inês Matos: "Minimum Range 2-Illuminated Paths", 5th Iberian Workshop on Computational Geometry, 7-9 February, 2008

15  Inês Matos: "The alpha-Embracing Countour", ICCSA 2008 (Workshop on Computational Geometry and Applications), 29/June – 2/July, 2008

16  Liliana Costa, C.M. da Fonseca, Enide Andrade Martins,"Acyclic Birkhoff Polytope", Décima Quinta Conferência da International Linear Algebra Society, México, Cancun, 16 a 20 de Junho de 2008

17  Paula Rama, Paula Carvalho. "Integral graphs and (k,\tau)-regular sets". SGT- in-Rio: Workshop on Spectral Graph Theory with applications on Computer Science, Combinatorial Optimization and Chemistry, Rio de Janeiro, December 1-4, 2008

18  Pedro Cruz and E. L. Lakshtanov. "Explicit representation of Green function for 3Dimensional exterior Helmholtz equation". Proc. of the 8th International Conference on Computational and Mathematical Methods in Science and Engineering (CMMSE 2008), June 13-16, 2008, La Manga, Spain.

19  Sá Esteves, J.; Rocha, P., Relative Stability of Linear Systems. Accepted talk (19-04-2008) to CONTROLO 2008, 8th International Conference of Automatic Control, July, 21-23, 2008, Vila Real (Portugal).

20  Tatiana Tchemisova, Basak Akteke-Ozturk, Gerhard Wilhelm Weber "On Continuous Optimization Methods in Data Mining---, Cluster Analysis, Classification and Regression,--- Provided for Decision Support and Other Applications", International Conference on Collaborative decision Making, Toulouse, France, July 1-4,2008

National Conferences (10 occurrences)

1  "An asymptotic approach to conjugate time for bang-bang problems", Journée des doctorants, Fédération Denis Poisson, University of Orléans and University of Tours, France, November 25th, 2008.

2  "Introduction au Contrôle Optimal", Colloque Sciences en Sologne, University of Orléans, France, June 5th, 2008.

3  C. Requejo, A. Agra, L. Gouveia. Problema da determinação da subárvore óptima de uma árvore com restrição de cardinalidade. IO2008. Vila Real, 17-19 March, 2008

4  C. Requejo. Árvores no desenho de redes de telecomunicações. EN SPM2008, Coimbra, 25-28 June, 2008

5  Delfim F. M. Torres (co-authors: Rui A. C. Ferreira and Moulay Rchid Sidi Ammi), Diamond-alpha Integral Inequalities on Time Scales, 8th Portuguese Conference on Automatic Control -- CONTROLO'2008, held in Vila Real, from 21 to 23 July 2008

6  Domingos M. Cardoso, "Conjuntos parcialmente ordenados, polinómios cromáticos e Sudoku," Encontro Nacional da SPM, Coimbra, 25-28 de Junho, 2008

7  Dorota Mozyrska (co-author: Delfim F. M. Torres), Diamond-alpha polynomial series on time scales, 8th Portuguese Conference on Automatic Control -- CONTROLO'2008, held in Vila Real, from 21 to 23 July 2008

8  E. Santos, C. Requejo. Heurísticas para o problema da árvore de suporte com restrições de diâmetro. IO2008, Vila Real, 17-19 March, 2008

9  Tatiana Tchemisova and Carlos Rocha, "Um Algoritmo de Caracterização do Conjunto Admissível de Um Problema Convexo de Programação Semi-Infinita", 13º congresso de APDIO, IO2008, Vila Real, Portugal, Março 17-19, 2008

10  Vítor Neves, "Tamanho, dimensão e normabilidade", ENspm08 Coimbra Portugal, 25 a 28 Junho 2008

Invited Talks at International Conferences (9 occurrences)

1   Delfim F. M. Torres . . Recent Results on the Calculus of Variations on Time Scales. 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

2  Delfim F. M. Torres, Calculus of variations on time scales, Nonlinear Analysis and Optimization 2008, The Center for Mathematical Sciences, Technion, Haifa, Israel June 18-24, 2008 (conference to honor Alexander Ioffe and Simeon Reich for their 70th and 60th birthdays, respectively)

3  Delfim F. M. Torres, Computing ODE Symmetries as Abnormal Variational Symmetries, Fifth World Congress of Nonlinear Analysts (WCNA-2008), Orlando, Florida, USA, July 2-9, 2008

4  Delfim F. M. Torres, Computing ODE Symmetries from a Variational Point of View, International conference on "Smart Materials and Adaptive Structures: Mathematical Modeling and Computation", April 14--16, 2008, Tangier, Morocco

5  Delfim F. M. Torres, Recent Results on the Calculus of Variations on Time Scales, Calculus of Variations and Applications: from Engineering to Economy, Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa, Monte de Caparica, Portugal from 8th to 10th September 2008

6  Domingos M. Cardoso, "A survey on $(k,\tau)$-regular sets and their applications". International “Workshop on spectral graph theory with applications on computer science, combinatorial optimization and chemistry” (SGT in Rio), that takes place at the Federal University of Rio de Janeiro (PEP-COPPE-UFRJ), from1th to 4th, December 2008.

7  Natália Martins (co-author Delfim F. M. Torres) , An Euler-Lagrange equation for variational problems with higher-order nabla derivatives, Third Podlasie Conference on Mathematics, Universidade Técnica de Bialystok, Polónia, 11 a 13 de Abril de 2008

8  Natália Martins (co-author: Delfim F. M. Torres), "Calculus of Variations on Time Scales with Nabla Derivatives", WCNA-2008 (organization: International Federation of Nonlinear Analysts), Orlando, USA, 2 - 9 July 2008

9  Tatiana Tchemisova "On Comparison of Conditions Characterizing Optimality without Constraint Qualifications for Convex Semi-Infinite Problems", EURO mini-conference "Continuous Optimization and Knowledge-Based Technologies", EUROPT-2008, Neringa, Lithuanis, May 20-23, 2008

Research Seminars at Foreign Institutions (13 occurrences)

1  "Minimum Range 2-Illuminated Paths", Applied Mathematics Seminary of the Applied Mathematics Department, Universidad Politécnica de Madrid, Spain, June 2008.

2  An integer formulation to the problem of extracting embedded network. December/2008. Seminar at Instituto de Computación, Universidad de la República, Montevideo, Uruguay.

3  Ana M. Martins: “Hiding Points in Polygons Using Approximation Algorithms”, Scientific Seminar of the Department of Applied Mathematics, Universidad Politécnica de Madrid, Madrid, Spain, 3/June, 2008

4  C. Requejo. Árvores no desenho topológico de redes. IEETA, 07 July, 2008

5  D. M. Cardoso, Posets, "Matching and Partial Colouring," Department of Mathematics, Faculty of Science, University of Malta, 30 April, 2008

6  Domingos M. Cardoso, "Spectral Properties and Applications of (k,t)-regular sets: an overview," Department of Mathematics, Faculty of Science, University of Malta, 28 April, 2008

7  E. Lakshtanov, "Mathematics and little ones", Institute for Theoretical Physics, Zurich, 29 May 2008

8  E.Lakshtanov, "Quantum problem of minimal resistance", Institute for Theoretical Physics, Zurich, 27 May 2008

9  Evgeny Lakshtanov, Explicit representation of Green function for 3Dimensional exterior Helmholtz equation,INSTITUTE FOR INFORMATION TRANSMISSION PROBLEMS, Moscow, 5 Jan. 2008.

10  Inês Matos: “Safe routes under Minimum Range”, Scientific Seminar of the Department of Applied Mathematics, Universidad Politécnica de Madrid, Madrid, Spain, 3/June, 2008

11  Rui A. C. Ferreira. Constantin integral inequalities on time scales. Department of Mathematics and Statistics Missouri University of Science and Technology Rolla, Missouri 65409-0020, USA. 3/September/2008

12  Sá Esteves, J.; Rocha, P., Relative Stability of Linear Systems. Research Seminar of UIMA Group of Mathematical Systems Theory, February 29, 2008, Dep. of Mathematics, Universityof Aveiro, Aveiro, Portugal.

13  T. Tchemisova (with Olga Kostyukova) On a new approach to solution of convex SIP problems with continuum of constraints, talk on recearch seminar of the Department of Mathematical Theory of Systems of Institute of Mathematics, National Academy of Sciences of Belarus

2007

International Conferences (36 occurrences)

1  "Good theta-illumination of Points", 23rd European Workshop on Computational Geometry, Graz University of Technology, Graz, Austria, March 2007.

2  "Some Problems Related to Good Illumination", 2007 International Conference on Computational Science and Its Applications (ICCSA 2007), Kuala Lumpur, Malaysia, August 2007.

3  "Variations of Good Illumination", XII Encuentros de Geometría Computacional (XII EGC), Universidad de Valladolid, Spain, June 2007.

4  A. Aleksenko, "Newton’s Problem of Minimal Resistance in the Class of Solids of Revolution", The Twelfth International Conference on Difference Equations and Applications, July 23 - July 27, 2007, Lisbon, Portugal

5  Agnieszka B. Malinowska and Delfim F. M. Torres, A Computational Approach to Essential and Nonessential Objective Functions in Linear Multicriteria Optimization, 23rd IFIP TC 7 International Conference on System Modelling and Optimization, Cracow, Poland, July 23-27, 2007

6  Agostinho Agra, "Lower bounds for the optimal diversity management problem", Optimization 2007, July 22- 25, Porto

7  Ana M. Martins: “Some Problems Related to grid n-ogons”, XII Spanish Workshop on Computational Geometry, Valladolid, Spain, June 25-27, 2007

8  Antonio L. Bajuelos, “Solving some Combinatorial Problems in grid n-ogons”, 7th WSEAS International Conference on Applied Computer Science (ACS’07). Official conference of the World Scientific and Engineering Academy and Society (WSEAS), Venice, Italy, November 21-23, 2007

9  C. Requejo, L. Gouveia and T. Magnanti. Special cases of the diameter-constrained minimum spanning tree problem. OPTIMIZATION 2007, Porto, Portugal, 22-25 July, 2007

10  C. Requejo. Tight models for special cases of the diameter-constrained minimum spanning tree problem. Joint work with L. Gouveia and T. Magnanti. INOC 2007. Spa, Belgium, 22-25 April, 2007

11  Delfim F. M. Torres, Conservation laws for invariant functionals containing compositions, 7th IFAC Symposium on Nonlinear Control Systems (NOLCOS 2007), Session: Mathematical analysis of nonlinear systems, Pretoria, South Africa, 22--24 August, 2007

12  Delfim F. M. Torres, Constants of Motion for Non-Differentiable Quantum Variational Problems, Fifth Symposium on Nonlinear Analysis, Torun, Poland, 10-14 September, 2007

13  Delfim F. M. Torres, Higher-order calculus of variations on time scales, Workshop on Mathematical Control Theory and Finance, Instituto Superior de Economia e Gestão, Lisbon, on April 10-14, 2007

14  Domingos M. Cardoso and Sofia J. Piinheiro, "Graph eigenvalue techniques for the maximum cardinality k-regular induced subgraph problem" , Optimization 2007, Porto, 22-25 July.

15  Domingos M. Cardoso and Sofia Jorge Pinheiro, Graph eigenvalue techniques for the maximum cardinality k-regular induced subgraph, Optimization 2007, Porto, 22-25 July, 2007

16  Domingos M. Cardoso, Extensions of the Hoffman bound on the stability number of regular graphs, 6th Slovenian International Conference on Graph Theory, Bled, 24-30 June, 2007

17  E. Lakshtanov, "Scattering by Obstacles and Wave Problem of Minimal Resistance", The Twelfth International Conference on Difference Equations and Applications, July 23 - July 27, 2007, Lisbon, Portugal

18  Enide Andrade Martins, Fernando Silva, "On Jordan Product Problems", 14 th Conference of International Linear Algebra Society,University of Shangai, China, 16- 21 June 2007

19  Figueiredo, R. M. V. ; Labbé, M. ; de Souza, C. C . An integer formulation to the problem of extracting embedded network submatrices. Conférence scientifique conjointe en Recherche Opérationnelle et Aide à la Décision - FRANCORO V / ROADEF 2007, 2007, Grenoble.

20  Figueiredo, R. M. V. ; Labbé, M. ; de Souza, C. C. An integer formulation to the problem of extracting embedded network submatrices. INOC 2007-International Network Optimization Conference, 2007, Spa.

21  Guerra, M.; Centeno, M.L.: Maximization of the adjustment coefficient in "per claim" reinsurance. 11th International Congress on Insurance: Mathematics and Economics, IME2007, Piraeus, Greece, 10-12 July 2007

22  Guerra, M.; Centeno, M.L.: Optimal reinsurance for variance related premium calculation principles. 37th ASTIN Colloquium. Orlando, USA, 19-22 June 2007

23  Guerra, M.; Sarychev, A.: Approximants of generalized minimizers and degree of singularity of noncoercive optimal control problems. 13th Czech-French-German Conference on Optimization. Heidelberg, Germany, 17-21 September 2007

24  Guerra, M.; Sarychev, A.: Approximants of generalized minimizers and degree of singularity of noncoercive optimal control problems. ESF Research Conference "Control, Constraints and Quanta". Bedlewo, Poland, 10-16 October 2007

25  Inês Matos, "Good theta-illumination of Minimum Range", 4th Workshop on Computational Geometry, Universidade de Aveiro, February 7-9, 2007

26  Inês Matos: “Good theta-illumination of Points”, in Proc. of 23rd European Workshop on Computational Geometry, Graz, Austria, March 12-16, 2007

27  Inês Matos: “Some Problems Related to Good Illumination”, ICCSA 2007, Kuala Lumpur, Malaysia, August 26-29, 2007

28  Inês Matos: “Variations of Good Illumination”, XII Spanish Workshop on Computational Geometry, Valladolid, Spain, June 25-27, 2007

29  Jorge Sá Esteves, An Efficient Algorithm for Allocation of Servers to Erlang-C Systems, Optimization 2007, 6th. Protuguese Conference on Optimization, Porto, Portugal, July 22-25, 2007

30  Jorge Sá Esteves, On a Bicriterion Allocation of Servers for a Multidimensional Erlang Delay System, EURO XXII --- Conference of the European Federation of OR Societies, Prague, Check Republic, July 8-11, 2007

31  Moulay Rchid Sidi Ammi and Delfim F. M. Torres, Necessary Optimality Condition for a Discrete Dead Oil Isotherm Optimal Control Problem, Workshop on Mathematical Control Theory and Finance, Instituto Superior de Economia e Gestão, Lisbon, on April 10-14, 2007

32  Natália Martins (em co-autoria com Delfim Torres): "Necessary conditions for linear noncooperative $N$-player delta differential games on time scales", SNA 2007, Fifth Symposium on Nonlinear Analysis, Toruñ, Poland, 10 - 14 September 2007

33  Paula Carvalho, "Non Embeddability in Euclidean Three-space: an approach by Oriented Matroid Theory", na 14ª Conferência da International Linear Algebra Society, Universidade de Shangai, China, Julho de 2007

34  Tchemisova T.V., On reduction approach in convex Semi-Infinite Programming, "Optimization 2007", Porto, Portugal, 22-25 July 2007

35  Zbigniew Bartosiewicz and Delfim F. M. Torres, Noether's Theorem on Time Scales, 6th International ISAAC Congress, August 13, 2007 to August 18, 2007, Middle East Technical University (METU), Ankara, Turkey

36  “Optimization 2007”, conferência realizada entre 22 e 25 de Julho na Faculdade de Economia da Universidade do Porto; apresentou a comunicação “Exploring an alternative way for approximately computing the Lovász theta number”.

National Conferences (10 occurrences)

1  Alexander Plakhov and Tatiana Tchemisova, “Magnus effect and solution of minimal resistance problems”, 3rd Meeting “Optimization and Control” CIMA-CEOC, Évora, Oct. 12-13, 2007

2  Delfim F. M. Torres, Necessary optimality conditions for the calculus of variations on time scales, OPTIMIZATION 2007, University of Porto, from the 22nd to the 25th of July, 2007. Invited session "Optimal Control and Calculus Variations" (organized by: de Pinho & Fontes); Stream: Global Optimization and Control

3  Domingos M. Cardoso e Sofia J. Pinheiro, Majorantes espectrais para o número de estabilidade de grafos, CEOC/CIMA-UE Joint Meeting on Optimization and Control Theory, October 12-13 2007

4  Enide Andrade Martins e Fernando Silva, Problemas sobre Produtos de Jordan, CEOC/CIMA-UE, joint Meeting on Optimization and Control Theory, 12-13 October 2007

5  Liliana Costa, C.M. da Fonseca, Enide Martins, "O politopo de Birkhoff acíclico", 3º Encontro Anual CEOC-CIMA, Departamento de Matemática da Universidade de Évora, 12-13 de Outubro 2007

6  Moulay Rchid Sidi Ammi, Delfim F. M. Torres, Optimal control problem for a water-oil system, 3º encontro CEOC--CIMA-UE, 12 e 13 de Outubro de 2007, Évora

7  Natália Martins, Aplicações da Análise Não-Standard na Teoria dos Pontos Críticos, 4º SPIMNS (Seminário Português Itinerante de Matemática Não-Standard) , Departamento de Matemática do Instituto Superior Técnico (Universidade Técnica de Lisboa), 23 - 24 de Novembro de 2007

8  Natália Martins, Delfim F. M. Torres, "Nash-equilibrium necessary conditions for linear delta differential games", 3 º Encontro Anual CEOC-CIMA, Departamento de Matemática da Universidade de Aveiro, 12-13 October 2007

9  Paulo D. F. Gouveia, Alexander Yu. Plakhov, Delfim F. M. Torres, Uma forma bidimensional que maximiza a resistência aerodinâmica newtoniana, 3º encontro CEOC--CIMA-UE, 12 e 13 de Outubro de 2007, Évora

10  Ricardo Almeida, Vítor Neves - Geometria infinitesimal em curvas, Universidade do Porto (SPIMNS), 9 de Março de 2007

Invited Talks at International Conferences (4 occurrences)

1  Delfim F. M. Torres, Invited Speaker, "Nonconservative Noether's theorem for fractional action-like variational problems", International Conference on "Applied Mathematics, Technology and Environment", International Days of Applied Mathematics, 11-12 May 2007, Tanger, Morocco

2  Domingos M. Cardoso, Convex quadratic programming techniques on graphs and related spectral results, Seminar on Applied and Industrial Mathematics of the Mathematical Institute of Serbian Academy of Sciences and Arts, Belgrade, June 5 2007

3  Domingos M. Cardoso, Graphs whose stability number is easily determined, Conference to celebrate the 80th birthday of Professor Horst Sachs, Ilmenau, 26-30 March, 2007

4  Plakhov A. , Tchemisova T. An Example of multiobjective Optimization in Mechanics, "EURO XXII", Prague, Chech Republic, 8-11, July 2007

Research Seminars at Foreign Institutions (10 occurrences)

1  "The alpha -Embracing Contour", Seminário do Departamento de Matemática Aplicada da Universidad Politécnica de Madrid, Spain, November 2007.

2  A. Aleksenko, "Newton's problem of minimal resistance. Modern results", Moscow state University, Russia (Collaboration with prof.dr. N. Moschevitin), 12-14 August 2007

3  A. Aleksenko, "The problem of the body of revolution of minimal resistance", 26-28 December 2007, Moscow state University, Russia

4  Adaptive Learning Algorithms for Bayesian Network Classifiers. Dpto. Lenguajes y Ciencias de la Computación. Escuela Técnica Superior de Ingeniería Informática. Universidad de Málaga.

5  E. Lakshtanovalk , "Explicit representation of Green function for 3Dimensional exterior Laplace equation", Ya. Sinai's seminar at Moscow State University, 18 Aug. 2007

6  Guerra, M.: Control theory from the geometric point of view. Johann Radon Institute for Computational and Applied Mathematics (RICAM), November 21, 2007

7  Guerra, M.: Optimal reinsurance policy: The adjustment coefficient and the expected utility criteria. Dipartimento de Matematica per le Decisioni. University of Florence, November 7, 2007

8  Inês Matos, "The alpha-embracing contour", Univesidad Politécnica de Madrid, November, 6, 2007

9  Jorge Sá Esteves, Equidade e Eficiência na Optimização de Sistemas Multidimensionais de Erlang-B, Seminário no Centro de Matemática da Universidade de Coimbra, Linha de Análise Numérica, Optimização e Aplicações, 26 de Janeiro de 2007

10  Natália Martins and Delfim F. M. Torres, "Mathematical and Computer Activities at the University of Aveiro -- how to promote Mathematics?", Faculty of Computer Science, Bialystok Technical University, Poland, 2007

2006

International Conferences (38 occurrences)

1  "A new direct optimization method for problems of the calculus of variations and optimal control", ICM Satellite Conference, Trends and Challenges in the Calculus of Variations and its Applications, University Castilla La Mancha, Spain, August 16-19, 2006.

2  A. Agra and M. Constantino "A polyhedral study of a mixed integer set", ISMP 2006, Rio de Janeiro, Brasil, July, 30 to August, 4

3  A. Agra and M. Constantino, "Recent results on basic mixed-integer sets", Mixed Integer and Integer Programming: the way forward - CORE 40th anniversary, Belgium, May, 31 to June, 1, 2006

4  A.Plakhov and T.Tchemisova. Optimization problems for Newtonian aerodynamic resistance. Iberian Conference in Optimization, Coimbra, Portugal

5  Ana M. Martins, Characterizing and Covering Some Subclasses of Orthogonal Polygons (with Antonio L. Bajuelos), University of Reading, UK, May 28-31, 2006

6  Antonio L. Bajuelos, Guarding two Subclasses of Orthogonal Polygons (with Ana M. Martins), International Conference of Computational Methods in Sciences and Engineering, Crete, Greece, 27/October - 1/November, 2006

7  Antonio L. Bajuelos, On Visibility Problems in the Plane – Solving Minimum Vertex Guard Problems by Successive Approximations (with Ana P. Tomás), Ninth International Symposium on Artificial Intelligence and Mathematics, Fort Lauderdale, Florida, USA, January 4 - 6, 2006

8  António Pereira and Rosália Rodrigues, A Symbolic Approach to Quantum Computation Simulation, University of Reading, UK, May 28-31, 2006

9  Centeno, M. Lourdes e Guerra, M. The optimal reinsurance policy in terms of the adjustment coefficient criterion. Comunicação apresentada pela Professora Maria de Lourdes Centeno no "10th International Congress on Insurance: Mathematics and Economics", Lovaina, Bélgica, 18-20 de Julho, 2006

10  Cristiana J. Silva, A new direct optimization method for problems of the calculus of variations and optimal control (with Delfim F. M. Torres), Trends and Challenges in the Calculus of Variations and its Applications, Convento de Madre de Dios, Toledo, Spain, ICM Satellite Conference, August 16-19, 2006

11  Cruz, J. P. Evolution Strategies on Optimal Control. 5th Junior European Meeting on Control & Information Technology September 20-22, 2006, Tallinn, Estónia

12  Delfim F. M. Torres, Absolute Extrema of Invariant Optimal Control Problems, (with Cristiana Silva), Third International Conference of Applied Mathematics, August 12-18, 2006, Plovdiv, Bulgaria

13  Delfim F. M. Torres, Nonconservative Noether's Theorem in Optimal Control, 13th IFAC Workshop on Control Applications of Optimisation (CAO'06), Paris - Cachan, France, April, 2006

14  Delfim F. M. Torres, Some Applications of the Method of Normal Fundamental Functions to Oscillation Problems (with Olena V. Mul), MTNS 2006 -- the 17th International Symposium on Mathematical Theory of Networks and Systems, July 24-28, 2006, Kyoto, Japan

15  Delfim F. M. Torres, Noether's theorem for fractional optimal control problems (with Gastão S. F. Frederico), Fractional Differentiation and its Applications (FDA'06), 19 - 21 July, 2006, Porto, Portugal

16  Domingos M. Cardoso and Sofia J. Piinheiro, ,"Continuous optimization polynomial-time upper bounds on the stability number of graphs", Iberian Conference in Optimization, Coimbra, November.

17  Domingos M. Cardoso, Convex quadratic programming techniques on graphs, EURO XXI, Reykjavik, July 2-5 2006

18  Domingos M. Cardoso, Paula Rama, Spectral results on graphs with regularity constraints, Aveiro Workshop on Graph Spectra, April 10-12 2006

19  E. H. Manfredini, M. A. Martins and J. P. Cruz. Tautprover, A Teaching Aid for Building Proofs in Propositional Calculus. Second International Congress on Tools for Teaching Logic. 26-30 Setember 2006, Salamanca, Spain

20  Guerra, M. Generalized Synthesis for Singular Nonlinear Optimal Control Problems. International Symposium on Generalized Solutions in Control Problems. Ulan Ude, Russia, July 4-7, 2006

21  Guerra, M., Sarychev, A. Approximation of generalized minimizers and regularization of optimal control problems. 3rd Workshop on Lagrangian and Hamiltonian Methods for Nonlinear Control (LHMNLC'06), Nagoya, Japan, July 19-21, 2006

22  Guerra, M., Sarychev, A. Regularizations of optimal control problems for control-affine systems. 17th International Symposium on Mathematical Theory of Networks and Systems (MTNS 2006), Kyoto, Japan, July 24-28, 2006

23  Maria Paula Carvalho, Non embeddability in Euclidean 3-space: an algebraic approach, SIGMAC'06, Third Workshop in Symmetries in Graphs, Maps and Complexes, July 17-21 2006

24  Moulay Rchid Sidi Ammi, Existence and uniqueness of solutions for a nonlocal parabolic thermistor-type problem (with Delfim F. M. Torres), 13th IFAC Workshop on Control Applications of Optimisation, CAO'06, Paris - Cachan, France, 26-28 April 2006

25  Moulay Rchid Sidi Ammi, " Regularity of Minimizers in the second-Order Calculus of Variations" (with Delfim. F. M. Torres), 2nd Podlasie Conference of Mathematics (Druga Podlaska Konferencja Matematyczna), University of Mathematics and Applied Computer Science, Bialystok, Poland, April 2006

26  Moulay Rchid Sidi Ammi, "A Dead oil isotherm optimal control problem" (poster)(with Delfim F. M. Torres), A Conference in Honor of Thomas I. Seidman "Advances in Control of Partial Differential Equations", Department of Mathematics and Statistics, University of Maryland, Baltimore Country, USA, October 28 - 29, 2006

27  Moulay Rchid Sidi Ammi, "Error estimates to a nonlocal parabolic problem" at ICM 2006: International Congress of Mathematicians, Madrid, Spain, August 22-30, 2006

28  Natália Martins, Mountain Pass Theorems without Palais-Smale conditions, no encontro internacional Nonstandard Methods and Applications in Mathematics NSM2006, Departamento de Matemática da Universidade de Pisa, Itália, 25 - 31 de Maio de 2006

29  O. Kostyukova, T. Tchemisova. Explicit Optimality Conditions for Convex Semi-Infinite Programming, EURO XXI, Reykjavik, Iceland,

30  Olena Mul, "Analysis of Some Hybrid Controlled Systems", INTAS Summer School on Nonlinear Analysis with Applications in Economics, Energy, and Transportation, Bergamo, Italy, June 5-9, 2006

31  Olena Mul, "Some Applications of Partial Differential Equations Fof Analysis And Control of Hybrid Oscillation Systems" (poster), A Conference in Honor of Thomas I. Seidman "Advances in Control of Partial Differential Equations", Department of Mathematics and Statistics, University of Maryland, Baltimore County, USA, October 28 - 29, 2006

32  Paulo D. F. Gouveia, Delfim F. M. Torres, A Maple interface for computing variational symmetries in optimal control, poster presented by Paulo D. F. Gouveia at ICM 2006: International Congress of Mathematicians, Madrid, Spain, August 22-30, 2006

33  Ricardo Almeida, Vítor Neves, mu-differentiability of an internal function, NonStandard Methods and Applications in Mathematics", Pisa, Itália, 25-31 de Maio de 2006

34  T. Tchemisova and O. Kostyukova. Convex Parametric Semi-Infinite Programming Problems and Properties of their Solutions in a Neighborhood of Irregular Points, Workshop on Advances in Continuous Optimization, Reykjavik, Iceland, 2006

35  T. Tchemisova, O. Kostyukova. On New Concepts of Immobile Points and Immobility Orders in Convex Semi Infinite Programming, EURO XXI, Reykjavik, Iceland

36  T. Tchemisova. Study of a Special Nonlinear Problem Arising in Convex Semi-Infinite Programming, Iberian Conference in Optimization, Coimbra, Portugal, 16-18 November,2006

37  “Aveiro Workshop on Graph Spectra”, conferência realizada na Universidade de Aveiro entre 10 e 12 de Abril de 2006; apresentou a comunicação “A characterization of Delsarte's bound as a ratio bound”.

38  “EURO XXI – 2006 / 21st European Conference on Operational Research ”, realizado em Reykjavík, Islândia, entre 2 e 5 de Julho de 2006. Apresentou a comunicação “A Heuristic for the Stability Number of a Graph based on Convex Quadratic Programming and Tabu Search”, em co-autoria com Luís Cavique Santos.

National Conferences (18 occurrences)

1  A. Plakhov, T. Tchemisova. Multiobective problems of Newtonian Resistance for Non-Convex Bodies in Two Dimensions, XII APDIO Congress "IO 2006", Lisbon, Portugal, 2006

2  Agostinho Agra, Domingos M. Cardoso, J. Orestes Cerdeira, Miguel Miranda, Eugénio Rocha, "Optimização da diversidade e distribuição de cablagens para a indústria automóvel", 12º Congresso da APDIO - IO2006, October 8-11, 2006, Lisboa, Portugal

3  Alexander Plakhov, “Billiards in unbounded regions and applications to problems of minimal aerodynamic resistance”, 2nd Meeting “Optimization and Control”, CEOC (Aveiro) e CIMA-UE (Évora), Aveiro, June 12 - 13, 2006

4  Ana M. Martins, Iluminação de certas classes de polígonos ortogonais (with Antonio L. Bajuelos), Encontro CEOC-UA e CIMA-UE, 12 e 13 de Junho de 2006, Departamento de Matemática, Universidade de Aveiro

5  António Pereira e Rosália Rodrigues "Um ponto ponto de vista de vista simbólico sobre a Simulação de Algoritmos Quânticos", Encontro CEOC-UA e CIMA-UE, 12 e 13 de Junho de 2006, Departamento de Matemática, Universidade de Aveiro

6  Guerra, M. Geometrical synthesis for noncoercive nonconvex optimal control problems. Proceedings of CONTROLO'2006, 7th Portuguese Conference on Automatic Control, IST 11-13 September 2006

7  Guerra, M.: Contratos de Resseguro Óptimos para uma Seguradora que Procura Minimizar o Risco de Ruína. Meeting CEOC-CIMA/UE, University of Aveiro, June 13, 2006

8  Moulay Rchid Sidi Ammi, Regularity of solutions to variational problems with higher order derivatives (with Delfim F. M. Torres), Encontro CEOC-UA e CIMA-UE, 12 e 13 de Junho de 2006, Departamento de Matemática, Universidade de Aveiro

9  Moulay Rchid Sidi Ammi, " Regularity of Minimizers in the second-Order Calculus of Variations" (with Delfim. F. M. Torres), Conference "Views on ODEs" June 21-24, 2006 in honour of the Professors Arrigo Cellina and James A. Yorke on the occasion of their 65th birthday, Aveiro, Portugal

10  Moulay Rchid Sidi Ammi, "Error estimates to a nonlocal parabolic problem", "Control, Optimization and Computation", CONTROLO 2006 - 7th Portuguese Conference on Automatic Control, Lisbon, 11--13 September 2006

11  Moulay Rchid Sidi Ammi, XIX Encontro do Seminário Nacional de História da Matemática, June 9-10, 2006 Universidade de Aveiro - Departamento de Matemática, Portugal

12  Natália Martins, "Teoremas da Passagem da Montanha sem condições de Palais-Smale" no Encontro Anual CEOC-CIMA, que decorreu no Departamento de Matemática da Universidade de Aveiro, nos dias 12 e 13 de Junho de 2006

13  Olena V. Mul, Problemas de valores próprios para alguns sistemas híbridos de controlo de teleféricos (with Delfim F. M. Torres), Encontro CEOC-UA e CIMA-UE, 12 e 13 de Junho de 2006, Departamento de Matemática, Universidade de Aveiro

14  P. Rama, Graphs with regularity constraints , Seminário da Linha de Álgebra do CMUC, Dep. Mat., Univ. de Coimbra, 10 Jan. 2006

15  Ricardo Almeida, Vítor Neves - Análise Não Standard em Variedades Diferenciáveis, Universidade de Évora (SPIMNS), 24 de Novembro de 2006

16  Ricardo Almeida, Vítor Neves - Perturbações infinitesimais na m-diferenciabilidade, Universidade de Aveiro (SPIMNS), 23 de Setembro de 2006

17  T. Tchemisova. Implicit optimality criterion for Semi-infinite Programming, 2º anual meeting of research groups CEOC (Aveiro) and CIMA-UE (Évora), 2006

18  “IO 2006 / 12º Congresso da APDIO”, realizado no ISEG-UTL em Lisboa entre 9 e 11 de Outubro de 2006. Foi co-autor, com Aldina Soares e Paulo Ferrão, da comunicação “Modelação do Funcionamento do Mercado sobre Opções para a Sustentabilidade”, apresentada por Aldina Soares.

Invited Talks at International Conferences (10 occurrences)

1  Agnieszka B. Malinowska and Delfim F. M. Torres, Nonessential Functionals in Multiobjective Optimal Control Problems, 5th Junior European Meeting on Control and Information Technology (JEM'06), Tallinn, Estonia, September 20-22, 2006

2  Critical Points (NSM2006 Pisa, May)

3  Delfim F. M. Torres, Direct Optimization of Invariant Optimal Control Problems (with Cristiana Silva), 5th Junior European Meeting on Control and Information Technology (JEM'06), September 20-22, 2006, Tallinn, Estonia

4  Delfim F. M. Torres, Lipschitzian Regularity of Minimizers in the Higher-Order Calculus of Variations (with Moulay Rchid Sidi Ammi), 5th Junior European Meeting on Control and Information Technology(JEM'06), September 20-22, 2006, Tallinn, Estonia

5  Delfim F. M. Torres, The Noether's Principle and Fractional Differentiation, 2nd Podlasie Conference of Mathematics (Druga Podlaska Konferencja Matematyczna) (invited talk), University of Mathematics and Applied Computer Science, Bialystok, Poland, April 2006

6  Domingos M. Cardoso and Sofia Pinheiro, "Continuous optimization polynomial-time upper bounds on the stability number of graphs," Iberian Conference in Optimization, Coimbra, 16-18 November, 2006

7  Domingos M. Cardoso, The class of graphs with convex-qp stability number, International mathematical conference - Topics in mathematical analysis and graph theory (MAGT), August 31 - September 4, 2006, Belgrade, Serbia

8  Kostyukova O.I., Tchemisova T.V. Explicit Optimality Conditions for Convex semi-Infinite Programming, "EURO XXI", Reykjavik, Iceland, 2-5 July, 2006

9  Olena V. Mul, Dynamics of Controlled Hybrid Systems of Aerial Cable-Ways (with Delfim F. M. Torres), The International Conference of Hybrid Systems and Applications, The University of Louisiana, Lafayette, LA, USA, May 22-26, 2006

10  Pedro A. F. Cruz, Evolution Strategies on Optimal Control -- a numerical study (with Delfim F. M. Torres), 5th Junior European Meeting on Control and Information Technology (JEM'06), Tallinn, Estonia, September 20-22, 2006

Invited Talks at National Conferences (1 occurrences)

1  Delfim F. M. Torres, Regularity of solutions to second-order integral functionals in variational calculus, (with Moulay Rchid Sidi Ammi), Invited Session "Control, Optimization and Computation", CONTROLO 2006 -- 7th Portuguese Conference on Automatic Control, Lisbon, 11--13 September 2006

Research Seminars at Foreign Institutions (4 occurrences)

1  Acyclic orientations with path constraints. October / 2006. Computer Science Seminars. Computer Science Department. Université Libre de Bruxelles

2  E.L.Lakshtanov, "Quantum analogue of Newton minimal resistance problem", Ya.Sinai seminar, MSU Moscow, 25 aug. 2006

3  E.L.Lakshtanov, "Scattering amplitude as a distribution and some applications", Landau Institute for Theoretical Physics, Moscow, 8 sept. 2006.

4  Guerra, M.: Regularizations of Optimal Control Problems for Control-affine Systems. Dipartimento de Matematica per le Decisioni. University of Florence, January 17, 2006

2005

International Conferences (28 occurrences)

1  "Good Illumination with Limited Visibility", International Conference of Numerical Analysis and Applied Mathematics 2005 (ICNAAM 2005), Rhodes, Greece, September de 2005.

2  "Newton's Problem of Minimal Resistance in Arbitrary Dimension", 4th Junior European Meeting on Control, Optimization, and Computation, Bialystok Tecnhical University, Poland, September 11-14, 2005.

3  Abellanas M., Bajuelos A., Hernandez G., Matos I. and Belen Palop.: Minimum Illumination Range Voronoi Diagrams, in Proc. of 2nd International Symposium on Voronoi Diagrams in Science and Engineering (VD2005), Seoul, Korea, (2005)

4  Agra and M. Constantino, A special case of the integer single node flow set with upper bounds, Proceedings of the International Network Optimization Conference 2005, March 21-23, Lisbon, Portugal

5  António Pereira, Redundant Quantum Arithmetic, ICANNGA 2005 -- International Conference on Adaptive and Natural Computing Algorithms, March, 2005

6  Bajuelos A. L., "Good Illumination of Points and Line Segments with Limited Range Lights", 11th Spanish Conference on Computational Geometry (XI EGC), Universidad de Santander, Santander, Spain, June 27 - 29, 2005

7  Bajuelos A.L., "Some properties of FAT and THIN grid n-ogons", International Conference of Numerical Analysis and Applied Mathematics (ICNAAM 2005), Rhodes, Greece, September 16-20, 2005

8  C. Requejo. On a Diameter-Constrained Steiner Tree Problem. Joint work with L. Gouveia and T. Magnanti. INOC 2005. Lisboa, Portugal, 25-28 March, 2005

9  Cristiana J. Silva, Delfim F. M. Torres, Newton's Problem of Minimal Resistance in arbitrary dimension, 4th Junior European Meeting on "Control and Optimization", Department of Mathematics, Institute of Mathematics and Physics, Bialystok Technical University, September 11-14 2005, Bialystok, Poland

10  Delfim F. M. Torres, A Noether Theorem on Unimprovable Conservation Laws for Vector-Valued Optimization Problems in Control Theory, First International Conference on Modeling, Simulation and Applied Optimization (ICMSAO'05), February 1-3 2005, American University of Sharjah, United Arab Emirates, 2005

11  Delfim F. M. Torres, Scientific Computation of Conservation Laws in the Calculus of Variations and Optimal Control, 10th International Conference Mathematical Modelling and Analysis (MMA2005) and 2nd International Conference Computational Methods in Applied Mathematics (CMAM05), 1-5/June/05, June 2005, Trakai, Lithuania

12  Delfim F. M. Torres, Weak Conservation Laws for Minimizers which are not Pontryagin Extremals, 2nd International Conference "Physics and Control" (PhysCon 2005), 24-26/08/2005, Saint Petersburg, Russia

13  Domingos M. Cardoso, A spanning star forest model for the diversity problem in automobile industry, with Agostinho Agra, Orestes Cerdeira, and Eugénio Rocha. ECCO XVIII, Minsk, Belarus, May 26-28, 2005

14  Domingos M. Cardoso, On the maximum cardinality of k-regular induced subgraphs, INFORMS Annual Meeting, San Francisco, USA, November 13--16, 2005

15  Domingos M. Cardoso, Optimization of Diversity and Distribution of Cable Configuration for Automobile Industry, with Agostinho Agra, Orestes Cerdeira, and Eugénio Rocha. 17th EURO Mini Conference: Coninuous Optimization in Industry, Pécs, Hugary, June 29 - July 1, 2005

16  Eugénio A. M. Rocha, First Integrals for Problems of the Calculus of Variations on Locally Convex Spaces, OTFUSA'2005, International Conference on Operator Theory, Function Spaces and Applications, dedicated to the 60th birthday of Professor F.-O. Speck, 7-9 July 2005, Aveiro

17  Eugénio A. M. Rocha, Quadratures of Pontryagin Extremals of some Optimal Control Problems, 4th Junior European Meeting on "Control and Optimization", Department of Mathematics, Institute of Mathematics and Physics, Bialystok Technical University, September 11-14 2005, Bialystok, Poland

18  Figueiredo, R. M. V. ; Barbosa, V. C ; Maculan, N.; de Souza, C. C. . On the polytope of acyclic orientations with path constraints and its applications. V ALIO/EURO Conference on Combinatorial Optimization, 2005, Paris.

19  Ilona A. Dzenite, Delfim F. M. Torres, A Remark on Noether's Theorem of Optimal Control 10th International Conference Mathematical Modelling and Analysis, June 1 - 5, 2005, Trakai, Lithuania

20  Manuel Guerra, Generalized trajectories for affine control systems. 4th Junior European Meeting on "Control and Optimization", Institute of Mathematics and Physics of the Bialystok Technical University, Poland, September 11-14, 2005

21  Matos I., "Computing the MIR Point in linear time", III Workshop on Computational Geometry, Sedano, Spain, November, 2005

22  Matos I., "Good Illumination with Limited Visibility", International Conference of Numerical Analysis and Applied Mathematics (ICNAAM 2005), Rhodes, Greece, Setember 16-20, 2005

23  Olena V. Mul, Delfim F. M. Torres, On Asymptotical Method for Vibrations Analysis of Large Elastic Dynamical Systems, Sixth International Conference "Symmetry in Nonlinear Mathematical Physics", June 20-26, 2005, Institute of Mathematics, National Academy of Sciences of Ukraine, Kyiv (Kiev), Ukraine

24  Pedro Cruz, Speeding up backpropagation with multiplicative batch update step, International Conference on Adaptive and Natural Computing Algorithms in Coimbra -- Portugal, March, 2005

25  Rachid Sidi Ammi, A spatially semi discrete finite element method for a non local parabolic problem, Huitièmes Journées d'analyse Numérique et Optimisation, ENIM Rabat Maroc, 14-16 December 2005

26  Rasteiro, D.M.L.D, Anjo, A. Batel, Optimal Paths in Networks with Stochastic Traversal Lengths, Workshop on Global Optimization 2005, San José, Almeria, Spain

27  Tchemisova T.V., Plakhov A.Yu., On Discrete Simulation for Mass Transportation, 17-th Trienial Conference of the International Federation of Operational Research Societies “IFORS 2005”, Hawaii, USA, Julho, 2005

28  Tchemisova T.V., Plakhov A.Yu., On the application of Discrete Optimization Methods in Solution of the Mass Transfer Problem, International Conference "Control Problems and Applications (technology, industry, economics)", Minsk, Belarus, May, 2005

National Conferences (9 occurrences)

1  Alexander Plakhov, “Problemas de resistência mínima”, 1st Meeting “Optimization and Control”, CEOC (Aveiro) - Cuima-EU (Évora), Évora, Apr. 22, 2005

2  Cardoso, D. M., Álgebras de Jordan em Optimização Cónica, with Luís A. Vieira, CEOC/CIMA-UE joint meeting on Optimization and Optimal Control, Évora, Portugal, April 22-23, 2005

3  Delfim F. M. Torres, Leis de Conservação de Pareto para problemas de Controlo Óptimo Multicritério, Encontro Optimização e Controlo Óptimo CEOC (Aveiro) -- CIMA-UE (Évora) 2005, Abril 22-23 2005, Évora

4  Delfim F. M. Torres, Descobrir o Maple, Escola Secundária Homem Cristo, Aveiro, 19/Janeiro/2005

5  Delfim F. M. Torres, Variations around the Deductive Approach in Optimal Control, Socrates-Erasmus & Polish Mathematical Society Lecture, Bialystok Technical University, 29-Nov-2005, Poland

6  Eugénio A. M. Rocha, Calculus and representation of flows of nonautonomous ODEs, Socrates-Erasmus & Polish Mathematical Society Lecture, Bialystok Technical University, 28-Nov-2005, Poland

7  Eugénio A. M. Rocha, Método de redução para geodésicas sub-Riemannianas num grupo de Lie nilpotente, Encontro Optimização e Controlo Óptimo CEOC (Aveiro) - CIMA-UE (Évora) 2005, Abril 22-23 2005, Évora

8  Guerra, M.: Introdução ao Integral de Itô (short course). Seminar of Núcleo de Matemática Financeira do ISEG. 11, 18 and 25 May 2005. Generalized synthesis and computation of nonclosed accessible sets in control theory. Centro de Matemática e Aplicações. Instituto Superior Técnico/UTL, May 20, 2005

9  Manuel Guerra, Nonlinear control systems with high-order impulses. Encontro Optimização e Controlo Óptimo CEOC (Aveiro) - CIMA-UE (Évora) 2005, Abril 22-23 2005, Évora

Invited Talks at International Conferences (1 occurrences)

1  Delfim F. M. Torres, Symbolic Computation of Symmetries and Conservation Laws in Optimal Control, 4th Junior European Meeting on Control and Optimization, Department of Mathematics, Institute of Mathematics and Physics, Bialystok Technical University, September 11-14 2005, Bialystok, Poland

Invited Talks at National Conferences (1 occurrences)

1  Domingos M. Cardoso, A matemática e os seus problemas, Semana da Ciência e Tecnologia, Universidade de Aveiro, 21-27 de Novembro, 2005

Research Seminars at Foreign Institutions (4 occurrences)

1  "Computing the MIR Point in linear time", III Workshop on Computational Geometry, Sedano, Spain, November 2005.

2  "Good Illumination: a Variant to the Classical De finition of illumination in Computational Geometry", Applied Mathematics Seminary of the Applied Mathematics Department, Universidad Politécnica de Madrid, Spain, June 2005.

3  "Good Illumination: a Variant to the Classical De finition of illumination in Computational Geometry", VII Seminario de Matemática Discreta, Universidad de Valladolid, Spain, June 2005.

4  Guerra, M.: Generalized controls for affine systems and their extremal synthesis. Dipartimento de Matematica per le Decisioni. University of Florence, April 28, 2005

2004

International Conferences (14 occurrences)

1  "On the Classical Newton's Problem of Minimal Resistance", 3rd Junior European Meeting on Control, Optimization, and Computation, University of Aveiro, September 6-8, 2004.

2  Antonio Leslie Bajuelos: Partitioning orthogonal polygons by extension of all edges incident to reflex vertices: lower and upper bounds on the number of pieces, Workshop on Computational Geometry and Applications, ICCSA 2004, May, 14-17, 2004, Assisi, Italy

3  Antonio Leslie Bajuelos: Quadratic-time, linear-space algorithms for generating orthogonal polygons with a given number of vertices, 20th European Workshop on Computational Geometry, March, 24-26, 2004, Seville Spain

4  C. Requejo. A disjunctive programming approach for odd-diameter-constrained minimum spanning and Steiner trees. Joint work with L. Gouveia and T. Magnanti. Optimization 2004. Lisboa, Portugal, 25-28 July, 2004

5  Domingos M. Cardoso, Continuous optimization techniques on graphs. Workshop on Challenges of Continuous Optimization in Theory and Applications, Rhodes, Greece, July 2-3, 2004

6  Domingos M. Cardoso, Paula Rama, Eigenvectors and eigenvalues of graphs with regularity constraints, with Charles Delorme and Paula Rama. Conference on Graph Theory in memory of Claude Berge, Paris, France, July 5-9, 2004

7  Guerra, M.: Generalized synthesis for singular nonlinear control systems. "3rd Junior European Meeting on Control, Optimization and Computation", University of Aveiro, Portugal, 6-8 September 2004

8  Guerra, M.: Hamiltonian flows for impulsive control systems. IFAC Workshop GSCP-04 and satellite events, Pereslavl-Zalessky, Russia, September 21-29, 2004

9  Natália Martins, Nonstandard proofs of some Critical Point Theorems, Third Junior European Meeting on ''Control, Optimization and Computation'' - Departamento de Matemática da Universidade de Aveiro, 6-8 de Setembro de 2004

10  Natália Martins, Vítor Neves, Nonstandard Palais-Smale conditions. Conference on Non Standard Mathematics NSM2004, Departamento de Matemática da Universidade de Aveiro, 5-10 de Julho de 2004

11  Natália Martins, Vítor Neves, Nonstandard Palais-Smale conditions. First CTS Workshop, Instituto de Sistemas e Robótica da Universidade de Coimbra, 1-3 de Julho de 2004

12  Paulo D. F. Gouveia and Delfim F. M. Torres, A Computer Algebra Package for Determining Symmetries and Conservation Laws in the Calculus of Variations, Optimization 2004, Organized Session MA6: Optimal Control I, FCUL, Lisbon, Portugal, July 25-28, 2004

13  Rasteiro, D.M.L.D, Anjo, A. Batel, Optimal Paths in Networks with Stochastic Traversal Lengths, Optimization’2004, Lisboa, July 25-28 2004

14  Tchemisova T.V., Sarychev A.V., Abnormal Extrema in Non Linear Programming Problems: Optimality Conditions and Rigidity, Workshop on Challenges of Continuous Optimization in Theory and Application, Rodos, Greece, July, 2004

National Conferences (3 occurrences)

1  Guerra, M.: Nonlinear control systems with high-order impulses. Meeting CEOC-CIMA/UE, University of Évora, April 22, 2005. Geometric control theory: some singular cases. CEMAPRE/ISEG, November 16, 2004

2  Tchemisova T.V., Oliveira V.G., Santos J.S., Uma Abordagem Heurística a Resolução dum Problema de Rotação dos Veículos, XI congresso da APDIO "IO 2004", Porto, Portugal, 2004

3  V.Oliveira, J.S.Santos, T.Tchemisova, "Uma Abordagem Heuristica de um Problema de Optimização de Rotas e Veículos", 11º Congresso da APDIO IO 2004

Invited Talks at International Conferences (3 occurrences)

1  Delfim F. M. Torres, Symmetry in the Calculus of Variations and Optimal Control, Young European Researchers in Mechanics Meeting 2004 (YERM2004), Instituto Superior Técnico, Lisbon, Portugal, January 2004

2  Guerra, M.: Discontinuous Hamiltonian flows and generalized extremals for nonlinear control systems. Workshop Geometry of Control Systems and Distributions. Banach Center, Polish Academy of Science, Warsaw, 17 de Maio de 2004

3  Pereira, António, On Redundant Quantum Arithmetic, GQC - Group of Quantum Computation, Universidad Politecnica de Madrid, Spain, November 24, 2004

Research Seminars at Foreign Institutions (5 occurrences)

1  Domingos M. Cardoso, Graphs with convex-QP stability number. Seminar of Department of Discrete Mathematics, Adama Mickiewicza University, January 6, Poznan, Poland, 2004

2  Domingos M. Cardoso, Moore graphs and (k,t)-regular sets. Seminar on Applied Mathematics, Institute of Mathematics, Poznan University of Technology, January 7, Poznan, Poland, 2004

3  Guerra, M.: Discontinuous Hamiltonian flows and generalized extremals for nonlinear control systems. Workshop "Geometry of Control Systems and Distributions". Banach Center, Polish Academy of Science, Warsaw, May 17, 2004

4  Ricardo Almeida, Fundamentos da análise não standard, Universidade Portucalense, 17 de Março de 2004

5  V.G. Oliveira, J.S.Santos, T.Tchemisova, "Heuristicas na Solução dos Problemas de Roteirização de Veículos"

2003

International Conferences (10 occurrences)

1  Ana Paula Tomás, António Leslie Bajuelos, Fábio Marques, Approximation Algorithms to Minimum Vertex Cover Problems. X Encuentros de Geometria Computacional, Universidad de Sevilla, June 2003, Seville, Spain

2  C. Requejo. A 2-paths approach for odd-diameter-constrained minimum spanning and Steiner trees. Joint work with L. Gouveia and T. Magnanti. ISMP 2003. Copenhaga, Dinamarca, 18-22 August, 2003

3  C. Requejo. An intersecting tree model for odd-diameter-constrained minimum spanning and Steiner trees. Joint work with L. Gouveia and T. Magnanti. INOC 2003, Evry/Paris, France, 27-29 October, 2003

4  Delfim F. M. Torres, Integrals of Motion for Discrete-Time Optimal Control Problems, session "Optimal Control" (co-chair), IFAC Workshop on Control Applications of Optimization, CAO 2003, Visegrád, Hungary, July 2003

5  Delfim F. M. Torres, The Noether Principle of Optimal Control, Session on Optimal Control Theory, Eight Viennese Workshop on Optimal Control, Dynamic Games and Nonlinear Dynamics: Theory and Applications in Economics and OR/MS, Vienna, Austria, May 2003

6  Domingos M. Cardoso, Abordagens analíticas de um problema combinatório de descodificação de imagens, with M. Helena Silva. VI Congreso Galego de Estatística e Investigación de Operacións, November 5-7, 2003, Vigo, Espanha

7  Domingos M. Cardoso, On a subclass of well-covered graphs, with Rommel Barbosa. Thirty-fourth Southestearn International Conference on Combinatorics, Graph Theory, and Computing, March 3-7, 2003, Boca Raton, Florida, USA

8  Domingos M. Cardoso, Charles Delorme and Paula Rama, On Laplacian eigenvectors and eigenvalues and almost equitable partitions. Combinatorics in Oporto, September 12-17, 2003, Porto, Portugal

9  Natália Martins, Vítor Neves, Nonstandard Discrete Derivatives and Existence Theorems for ODEs,Second Junior European Meeting on Control Theory and Stabilization - Politécnico de Turim (Itália), 3 - 5 de Dezembro de 2003

10  Tomás A.P., Bajuelos A.L., Marques F., Aproximation Algorithms to Minimum Vextex Cover Problems on Polygons and Terrains, International Conference on Computational Science, June 2003, St. Petersburg, Russia

National Conferences (1 occurrences)

1  Domingos M. Cardoso, On Laplacian eigenvectors and eigenvalues and almost equitable partitions, with Charles Delorme and Paula Rama. Combinatorics in Oporto, September 12-17, 2003, Porto, Portugal

Invited Talks at International Conferences (7 occurrences)

1  Delfim F. M. Torres, A Proper Extension of Noether's Symmetry Theorem for Nonsmooth Extremals of the Calculus of Variations, Invited Session on Optimal Control, 2nd IFAC Workshop on Lagrangian and Hamiltonian Methods in Nonlinear Control, Sevilla, Spain, April 2003

2  Delfim F. M. Torres, Optimal Control of Newton-Type Problems of Minimal Resistance, Second Junior European Meeting, Control Theory and Stabilization, Dipartimento di Matematica, Politecnico di Torino, Torino, Italy, December 2003

3  Delfim F. M. Torres, The role of symmetry in the regularity properties of optimal controls, Symmetry in Nonlinear Mathematical Physics, Kiev, Ukraine, June 2003

4  E.Rocha, Computation of coordinates of first kind for nonlinear control systems, SciCADE03, Norway, Jul/2003

5  Guerra, M.: Discontinuous Hamiltonian flows for nonlinear control systems. Second Junior European Meeting "Control Theory and Stabilization", Politecnico de Torino, Torino, Italia, Dezembro de 2003

6  P. Carvalho, P. Oliveira, A. Batel Anjo, Uma Experiência no Ensino da Engenharia Usando o Computador, III Congresso Luso Moçambicano de Engenharia, Maputo, Moçambique, Agosto 2003

7  P. Oliveira, J.D. Vieira, P. Carvalho, Modelos: Vantagens e Desvantagens de um Sistema Baseado na Modelação de Questões Matemáticas, III Congresso Luso Moçambicano de Engenharia, Maputo, Moçambique, Agosto 2003

Invited Talks at National Conferences (1 occurrences)

1  Domingos M. Cardoso,Uma abordagem algébrica de grafos fortemente regulares. Sessão de Homenagem ao Professor Mário da Silva Rosa, Coimbra, Portugal, October 15, 2003

Research Seminars at Foreign Institutions (1 occurrences)

1  Guerra, M.: Linear-quadratic optimal control problems with time-variant order of singularity. Laboratoire de Mathématiques, Université Paris-Sud XI à Orsay, France. January 22, 2003

2002

International Conferences (3 occurrences)

1  Domingos M. Cardoso and Paula Rama, Spectral results with equitable bipartitions , Fourth Cracow Conference on Graph Theory-Czorsztyn2002, Czorsztyn, Poland, September 16-20, 2002

2  Guerra, M. Linear-Quadratic problems with time-variant order of singularity. First Junior European Meeting "Control Theory and Stabilization", Laboratoire Analyse Appliquée-Optimization, Université de Bourgogne, 2-4 October 2002

3  Guerra, M. On noncoercive quadratic forms. 4th International Conference on Dynamical Systems and Differential Equations, Wilmington, NC, USA, 24-27 May 2002

National Conferences (4 occurrences)

1  C. Requejo. A Disjunctive Programming Approach for Designing Diameter-Constrained Minimum Spanning and Steiner Trees. Joint work with L. Gouveia and T. Magnanti. IO 2002, Guimarães, 24-27 April, 2002

2  Guerra, M: Linear-quadratic problems with time-variant order of singularity. COPO 2002 - Matemáticos Portugueses em Controlo, Coimbra, Portugal, 2002

3  Paula Rama, D. M. Cardoso. “Resultados espectrais em grafos regulares-estáveis”. 10º congresso da APDIO-IO’2002, Universidade do Minho, Guimarães, Março 24 - 27, 2002

4  T. Tchemisova, A. Sarychev. On Rigidity of Abnormal Extrema in Problems of Nonlinear Programming, X Congresso da Apdio "IO 2002", Guimarães, Portugal, 2002

Research Seminars at Foreign Institutions (2 occurrences)

1  Duas novas formulações inteiras 0-1 para o problema de coloração de vértices. June / 2002. Seminários de Teoria da Computação do Instituto de Computação da UNICAMP - Campinas/Brasil.

2  Guerra, M.: Singular linear-quadratic optimal control problems, functional analysis and geometry. Banach Center Summer School on Mathematical Control Theory, Bedlewo, Poland, September 6, 2002