Den 4. desember skal cand. scient Hao Yu disputere for graden ph.d i anvendt matematikk og beregningsorienterte ingeniøranvendelser, og vil offentlig forsvare avhandlingen "Optimization Models and Methods for Sustainable Reverse Logistics Network Design". Dagen etter, den 5. desember, skal teknologie licentiat Åke Staffan Lundberg disputere for graden ph.d i anvendt matematikk og beregningsorenterte ingeniøranvendelser. Han vil da offentlig forsvare avhandlingen "Studies of Some Operators of Harmonic Analyses in certain Function Spaces with Applications to PDEs".
Kort sammendrag av avhandlingen til Hao Yu:
"With the increased focus on environmental pollution and sustainable development, the value recovery and re-creation from the End-of-Use and End-of-Life products has been given considerable attention by the whole society.
Reverse logistics is the process for recovering the value from End-of-Use and End-of-Life products through a series of activities, i.e., reuse, repair, remanufacturing, recycling and energy recovery. Nevertheless, due to the stochastic reverse product flow, unstable quality, the changing costs for facility operation and transportation, as well as the price fluctuation of the recovered products, the design of a reverse logistics network is a complex decision-making problem. In this PhD project, advanced optimization models and methods have been developed for providing decision-makers, supply chain managers and practitioners with better support and implications for the planning of a sustainable reverse logistics system under an uncertain environment. Moreover, the development on the modelling and solution techniques has contributed to the knowledge accumulation in operational research and management science and can also be used for modelling and resolving optimization problems in some other fields."
Hovedveileder: professor Wei Deng Solvang
Førsteopponent: Professor Kenn Steger-Jensen, Aalborg University, Centre for Logistics, Department of Mechanical and Manufacturing Engineering
Andreopponent: Professor Eva Pongracz, University of Oulu, Department of Process and Environmental Engineering
Internt medlem og komitéens administrator: Førsteamanuensis Klas Pettersson
Disputasen ledes av dekan Raymond Kristiansen, Fakultet for Ingeniørvitenskap og Teknologi, UiT-Norges arktiske universitet.
Prøveforelesing over oppgitt emne holdes kl. 10.15, samme sted: «Application of reverse logistic models in industry practice».
Kort sammendrag av avhandlingen til Åke Staffan Lundberg:
The study in this PhD thesis aims at development of certain mathematical methods used in applications, in particular, in the study of regularity properties of solutions in various mathematical models described by Partial Differential Equations (PDEs).
To this end, we study various operators of harmonic analysis in certain function spaces, since solutions to many PDEs may be expressed in terms of such operators. This PhD thesis consists of four papers (papers A--D) and an Introduction. In Paper A we introduce a version of weighted anisotropic mixed norm Morrey spaces and anisotropic Hardy operators. We derive conditions for boundedness of these operators in such spaces. We also reveal the role of these operators in the solving of some degenerate hyperbolic PDEs of some class. In Paper B we prove the boundedness of potential operators in weighted generalised Morrey space in terms of Matuszewska-Orlicz indices of weights and apply this result to the Helmholtz equation in R^3 with a free term in such a space. We also give a short overview of some typical situations when potential type operators arise when solving PDEs. In Paper C we study the boundedness of some multi-dimensional Hardy type operators in Hölder spaces and derive some new results of interest also in the theory of inequalities. In Paper D we prove some differentiation formulas for weighted singular integrals, which we suppose to apply in our future studies concerning the solution of some integral equations of the first kind. These new results are put into a more general frame in an Introduction, where also crucial parts of previous research by the candidate (e.g. published in two Licentiate theses) are briefly described. Note, in particular, that this PhD thesis may be regarded as a more theoretically based continuation of the Licentiate thesis in Wood Technology. This important link is carefully described in the Introduction.
- Hovedveileder: Førsteamanuensis Natasha Samko, Luleå tekniske universitet
- Medveiledere: Professor Lars-Erik Persson (UiT/IVT-fak) og professor Dag Lukkassen (UiT/IVT-fak)
Første opponent: Assosiate professor Humberto Gil Silva Rafeiro, Department of Mathematical Sciences, United Arab Emirates University, Al Ain. Andre opponent Docent Sorina Barza, Department of Mathematics, University of Karlstad, Sverige. Professor Arne Lakså, UiT/IVT-fak. (internt medlem og komiteens administrator).
Disputasen ledes av prodekan Raymond Kristiansen, Fakultet for Ingeniørvitenskap og Teknologi, UiT Norges arktiske universitet.
Prøveforelesing over oppgitt emne holdes kl. 10.15, samme sted: «Some mathematical methods and tools in engineering sciences».