21 documents found, page 1 of 3
Teachers’ appreciation of benefits and shortcomings of online and blended highe...
Skliarova, Iouliia; Meireles, Inês; Tchemisova, Tatiana; Cação, Isabel; Martins, NatáliaThis paper is devoted to identifying online teaching strategies appropriate for blended and face-to-face higher STEM (Science, Technology, Engineering, and Mathematics) education. The study is inspired by the experience gained during the COVID-19 pandemic lockdown, which forced many higher education institutions worldwide to shift abruptly to distance education and try many new tools, teaching methods, and stra...
Regularization algorithms for linear copositive programming problems: an Approa...
Kostyukova, Olga; Tchemisova, TatianaIn this paper, we continue an earlier study of the regularization procedures of linear copositive problems and present new algorithms that can be considered as modifications of the algorithm described in our previous publication, which is based on the concept of immobile indices. The~main steps of the regularization algorithms proposed in this paper are explicitly described and interpreted from the point of vie...
Semidefinite optimization models in multivariate statistics: a survey
Macedo, Eloísa; Tchemisova, Tatiana; Freitas, AdelaideNo abstract available.
Enriching traditional higher STEM education with online teaching and learning p...
Skliarova, Iouliia; Meireles, Inês; Martins, Natália; Tchemisova, Tatiana; Cação, IsabelIn this paper, we aim to identify online teaching and learning practices that would be beneficial for blended and traditional on-campus education within STEM (Science, Technology, Engineering, and Mathematics) courses. Our university, as well as the majority of higher education institutions worldwide, has had few to no experience in delivering full online courses before 2020. The teaching process was, however, ...
Twenty years of EUROPT, the EURO working group on Continuous Optimization
Cafieri, Sonia; Tchemisova, Tatiana; Weber, Gerhard-WilhelmEUROPT, the Continuous Optimization working group of EURO, celebrated its 20 years of activity in 2020. We trace the history of this working group by presenting the major milestones that have led to its current structure and organization and its major trademarks, such as the annual EUROPT workshop and the EUROPT Fellow recognition.
International Conference on Dynamic Control and Optimization - DCO 2021: book o...
Cruz, João Pedro; Tchemisova, TatianaSem resumo disponível.
Structural properties of faces of the cone of copositive matrices
Kostyukova, Olga; Tchemisova, TatianaIn this paper, we study the properties of faces and exposed faces of the cone of copositive matrices (copositive cone), paying special attention to issues related to their geometric structure. Based on the concepts of zero and minimal zero vectors, we obtain several explicit representations of faces of the copositive cone and compare them. Given a face of the cone of copositive matrices, we describe the subspac...
CQ-free optimality conditions and strong dual formulations for a special conic ...
Kostyukova, Olga; Tchemisova, TatianaIn this paper, we consider a special class of conic optimization problems, consisting of set-semidefinite (orK-semidefinite) programming problems, where the setKis a polyhedral convex cone. For these problems, we introduce theconcept of immobile indices and study the properties of the set of normalized immobile indices and the feasible set. Thisstudy provides the main result of the paper, which is to formulate ...
Equações diferenciais ordinárias: resumos teóricos, exercícios resolvidos e pro...
Tchemisova, Tatiana; Kharlamova, Vera; Freitas, Adelaide; Plakhov, AlexanderO presente livro tem como base uma publicação interna da Universidade de Aveiro realizada pelas primeiras três autoras na forma de sebenta com resumos teóricos e exercícios propostos de equações diferenciais ordinárias. Neste livro os tópicos abordados na sebenta foram melhorados e novos exemplos, exercícios resolvidos e exercícios propostos, acompanhados das respetivas soluções, fora,m acrescentados (...)
Problems of optimal transportation on the circle and their mechanical applications
Plakhov, Alexander; Tchemisova, TatianaWe consider a mechanical problem concerning a 2D axisymmetric body moving forward on the plane and making slow turns of fixed magnitude about its axis of symmetry. The body moves through a medium of non-interacting particles at rest, and collisions of particles with the body's boundary are perfectly elastic (billiard-like). The body has a blunt nose: a line segment orthogonal to the symmetry axis. It is require...