**Current projects**

- "Computer managed corpus linguistics - UNIOS - ZUP 2018 - Youth Research Projects", (Department of Mathematics, J. J. Strossmayer University of Osijek - J. J. Strossmayer University of Osijek ) - Project coordinator: Domagoj Ševerdija
**Summary:**Corpus linguistics investigate languages by using samples from given real-world texts. As a digitalized data source, it brings great possibilities for computer processing of corpus data inorder to help making corpus-based judgments. Most digitalized corpora today usually encompass a framework where one can make a linguistic-specific analysis. In this project, a unique network as a web application will be realized which will enable linguistic researchers to form their own corpora having at its disposal a set of tools for corpora analytics. This framework will be used for several case studies which are mostly investigated by theoretical linguistics approach. Our approach will be based on corpus data classification with respect to morphological and semantic features using standard corpus-based classification methods and recursive/recurrent neural network deep learning methods.**Programme:**UNIOS - ZUP 2018 - Youth Research Projects**Project members:**dr. sc. Ana Mikić Čolić, Assistant Professor (Faculty of Philosophy, Josip Juraj Strossmayer University of Osijek) i dr. sc. Mario Essert, Full Professor (Faculty of Mechanical Engineering and Naval Arcitecture of the University of Zagreb)**Project duration:**18 month - "Isolation of the unwanted part of the spectrum in the quadratic eigenvalue problem - UNIOS - ZUP 2018 - Youth Research Projects", (Department of Mathematics, J. J. Strossmayer University of Osijek - J. J. Strossmayer University of Osijek ) - Project coordinator: Suzana Miodragović
**Summary:**Some important properties of vibrational systems can be described by the corresponding quadratic eigenvalue problem. In the case when the eigenvalues of the mechanical system are close to the frequency of the external force this system undergo large oscillations. This is the phenomenon of so-called resonance. This acting of the system can be avoid by isolating the part of the eigenvalues in corresponding quadratic eigenvalue problem. If we define so-called resonance band in which we do not want eigenvalues, then the idea is to slightly modify damping matrix in order to obtain a new system whose eigenvalues are outside the resonance band. This problem will be obtained for the hyperbolic and also for gyroscopic quadratic eigenvalue problems.**Programme:**UNIOS - ZUP 2018 - Youth Research Projects**Project members:**Ninoslav Truhar (Department of Mathematics, J. J. Strossmayer University of Osijek), Zoran Tomljanović (Department of Mathematics, J. J. Strossmayer University of Osijek), Matea Puvača (Department of Mathematics, J. J. Strossmayer University of Osijek), Fernando de Teran (Universidad Carlos III de Madrid, Math. Department)**Project duration:**18 months - "Limiting behavior of intermittent processes and diffusions - UNIOS - ZUP 2018 - Youth Research Projects", (Department of Mathematics, J. J. Strossmayer University of Osijek - J. J. Strossmayer University of Osijek ) - Project coordinator: Danijel Grahovac
**Summary:**The inference in statistics and probability theory is largely based on limiting results that describe the stochastic properties of different models when time tends to infinity. For example, the central limit theorem guarantees that under some conditions the arithmetic mean has approximately a normal Gaussian distribution. Today it is quite clear that such results cannot describe the complexity of natural phenomena. Among other things, it is not possible to explain the fact that some phenomena show different behavior in small and large time scales (e.g. turbulent fluid flow, value of the financial asset, etc.). In this project the limiting properties of stochastic models will be studied. Emphasis will be placed on models that have the property of intermittency and on the implications that this property has on the stochastic nature of the model. In addition, the class of diffusion models will be studied, the limiting behavior of estimators of unknown parameters in these models, and the approximation of their transition density functions.**Programme:**UNIOS - ZUP 2018 - Youth Research Projects**Project members:**Nenad Šuvak (Department of Mathematics, J. J. Strossmayer University of Osijek), Ivan Papić (Department of Mathematics, J. J. Strossmayer University of Osijek), Nikolai N. Leonenko (School of Mathematics, Cardiff University), Murad S. Taqqu (Department of Mathematics and Statistics, Boston University), Una Radojčić (Department of Mathematics, J. J. Strossmayer University of Osijek) i Mirta Benšić (Department of Mathematics, J. J. Strossmayer University of Osijek)**Project duration:**18 months - "The optimization and statistical models and methods in recognizing properties of data sets measured with errors- Young Researchers' Career Development Project - Training of Doctoral Students", (Department of Mathematics, J. J. Strossmayer University of Osijek - Croatian Science Foundation) - Project coordinator: Mirta Benšić
**Summary:**The PhD student will deal with the methods of nonlinear regression and classification. Emphasis is placed on understanding, developing and applying nonparametric methods including neural networks. The specific purpose of this PhD education programme is to contribute to mathematical understanding of statistical and algorithmic properties of multilayer neural networks and related methods with a tendency to find expressions for the approximation of errors, complexity, statistical risk and time of calculation. Theoretically the results will be supported by simulations and applied to real problems. The PhD student is planned to enrol in the Joint Postgraduate Doctoral Study Programme in Mathematics of the universities of Osijek, Rijeka, Split and Zagreb, to specialise in the field of probability and mathematical ststistics and to further educate and train at the University of Yale (led by Prof. Andrew Barron).**Programme:**Young Researchers' Career Development Project - Training of Doctoral Students**Mentor's name and surname:**Mirta Benšić**PhD name and surname:**Una Radojičić**Project duration:**1 March 2017 - 28 February 2021 - "Optimization of parameter dependent mechanical systems - Young Researchers' Career Development Project - Training of Doctoral Students", (Department of Mathematics, J. J. Strossmayer University of Osijek - Croatian Science Foundation) - Project coordinator: Ninoslav Truhar
**Summary:**The doctoral student will deal with the optimization of active and passive damping of mechanical systems with and without external force. For this purpose, it will be necessary to develop a general theoretical framework that describes many important system properties and to construct adequate numerical algorithms for calculating the desired sizes. The doctoral candidate is planned to enroll in the Joint university postgraduate doctoral study program in mathematics at the universities of Osijek,Rijeka, Split and Zagreb and specialize in the field of control and optimization theory, i.e. ordinary differential equations and dynamic systems.**Programme:**Young Researchers' Career Development Project - Training of Doctoral Students**Mentor's name and surname:**Ninoslav Truhar**PhD name and surname:**Matea Puvača**Project duration:**20 September 2016 - 20 September 2020 - "Real-time measurements and forecasting for successful prevention and management of seasonal allergies in Croatia-Serbia cross-border region", (Department of Mathematics, J. J. Strossmayer University of Osijek - Interreg IPA CBC Croatia - Serbia 2014-2020) - Project coordinator: Kristian Sabo
**Summary:**Allergen avoidance is important for managing allergy. Knowledge about when certain pollen types are likely to be in the air helps allergy sufferers to plan activities and medication use. Since airborne pollen is transported by air masses it can easily cross the border resulting an increased risk for allergy symptoms in sensitive population. Airborne allergens are routinely monitored in cross-border area. However, applied methodology is time consuming and results are disseminated to end users with a delay which limits the impact of collected data in every day health management. The project will modernize public health service and notably enhance the quality and applicative value of the information they provide in cross-border area: by introducing real time monitoring of airborne allergens, by developing models for prediction exposure and by creating a joint platform for instantaneous dissemination of these information. In addition the project will make an effort to educate end users on the benefits from using information for prevention and management of allergy symptoms coming from the information public health services will provide following the implementation of this project. The project will focus on three major pollen allergens (i.e. Birch, Grass, Ambrosia) and thus, having in mind overall prevalence of seasonal allergies in the Croatia-Serbia cross-border region, its results will enhance public health services needed for 15-30% of the population. Particular attention will be given to introduction of developed services to vulnerable groups i.e. children and elderly people for which it can help to plan travelling, outdoor activities, start of the therapy, self assessment of the therapy effectiveness etc. Joint approach for dissemination of measurements and forecasts will improve information flow for people travelling from one side of the border to another but also for visitors coming from other regions.**Programme:**Interreg IPA Cross-border Cooperation Programme Croatia - Serbia 2014-2020**Project partners:**Institut BioSens - Istraživačko razvojni institut za informacione tehnologije biosistema (Lead Beneficiary), Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu and Grad Osijek**Project members:**Kristian Sabo, Krešimir Burazin, Nenad Šuvak and Slobodan Jelić**Project duration:**15 July 2017 - 14 January 2020 - "Robustness optimization of damped mechanical systems", (Department of Mathematics, J. J. Strossmayer University of Osijek - Ministry of Science and Education and Deutscher Akademischer Austanschdienst (DAAD)) - Project coordinator: Zoran Tomljanović
**Summary:**Mechanical systems have been widely investigated, but there are still many interesting and important open problems from the theoretical point of view and also from the applications themselves. Within this project we plan to consider robust damping optimization. The criterion for damping optimization that we want to consider corresponds to the H-infinity system norm which, compared to other criteria such as the H-2 norm or the total average energy, provides better damping properties in terms of the system's robustness. Thus, we plan to derive a new approach for efficient damping optimization and compare it to existing strategies.**Programme:**The programme aimed at encouraging the exchange of project participants between the Ministry of Science and Education of the Republic of Croatia and the DAAD**Project partners:**Technische Universität Berlin (Matthias Voigt, Volker Mehrmann and Philipp Schulze)**Team members (UNIOS):**Ninoslav Truhar and Matea Puvača**Project duration:**1 January 2017 - 31 December 2018 - "The optimization and statistical models and methods in recognizing properties of data sets measured with errors", (Department of Mathematics, J. J. Strossmayer University of Osijek - Croatian Science Foundation) - Project coordinator: Rudolf Scitovski
**Summary:**As a part of an attractive and active area of research known as big data analysis, optimization and statistical aspects of recognizing data sets properties will be analyzed. Research will be focused on clustering problems, deconvolution models and applications. The assumption is that the observed data sets represent the measured values of the variables to be analyzed but also that they contain a measurement error. In large data sets it is often appropriate to cluster data sets on the basis of certain characteristics and then apply models for each group that can describe variable properties such as relationship among them, possibility of separation, edges, specific form of the set of values, dimensions (length, surface or volume) of the set of values or general parameter vector which determines them. The problem in many practical situations can be formulated as an optimization problem for which the objective functions is generally neither differentiable nor convex. In order to solve such problems effectively, rapid and accurate numerical procedures will be developed. Also, due to errors in the data,in order to understand and correctly interpret the results, statistical models will be used and important statistical properties will be characterized.**Programme:**Croatian Science Foundation (IP-06-2016)**Team members (UNIOS):**Andrew Barron (Yale University, USA), Mirta Benšić (Department of Mathematics, University of Osijek, Croatia), Dragan Jukić (Department of Mathematics, University of Osijek, Croatia), Karlo Emmanuel Nyarko (Faculty of Electrical Engineering, Computer Science and Information Technology Osijek, University of Osijek, Croatia), Safet Hamedović (Faculty of Metallurgy and Materials, University of Zenica, BiH), Kristian Sabo (Department of Mathematics, University of Osijek, Croatia), Petar Taler (Department of Mathematics, University of Osijek, Croatia)**Project duration:**1 March 2017 - 28 February 2021 - "Mathematics for industry network (MI-NET) (TD COST Action TD1409 ), (Department of Mathematics, J. J. Strossmayer University of Osijek - COST - European Cooperation in Science and Technology) - Project coordinator: Kristian Sabo
**Summary:**Mathematics underpins all of modern science and technology but advances in mathematical research are not always applied to maximum advantage in industry. The objective of this Action is to create a Europe-wide partnership to promote collaboration in, and the benefits of, industrial mathematics. The Actiom will run industry workshops, trainings weeks, and short-term scientific missions to both academic and industrial hosts, with the general aim of increasing the interaction between industry and academia. Exploiting the mathematical knowledge and methodologies af academics will provide European industry with a competitive advantage. Universities will benefit, as mathematicians are able to focus on practically relevant and cutting edge research problems. The training of Early-Career Investigators in particular will lead to a new generation with problem solving and communication skills and collaborative links that will be essential to maintain the goals of this Action in the future long after this funding has finished.**Programme:**TD COST Action TD1409**Project partners:****Country****MC Member**Austria

Dr Andreas BINDER

Austria

Prof Ronny RAMLAU

Belgium

Dr Patricia TOSSINGS

Bosnia and Herzegovina

Dr Haris GAVRANOVIC

Bosnia and Herzegovina

Dr Harun ŠILJAK

Bulgaria

Mr Tihomir IVANOV

Bulgaria

Prof Petar POPOV

Croatia

Prof Anet REZEK JAMBRAK

Croatia

Prof Kristian SABO

Cyprus

Dr Katerina KAOURI

Cyprus

Dr Margarita ZACHARIOU

Denmark

Dr Poul HJORTH

Denmark

Prof Maria Dolores ROMERO MORALES

Estonia

Prof Peep MIIDLA

Estonia

Mr Jens HAUG

Finland

Dr Simo ALI-LÖYTTY

Finland

Dr Matylda JABLONSKA-SABUKA

France

Dr Joost ROMMES

France

Ms Edwige GODLEWSKI

fYR Macedonia

Dr Tatjana ATANASOVA-PACHEMSKA

fYR Macedonia

Dr Biljana JOLEVSKA-TUNESKA

Germany

Prof Dietmar HOEMBERG

Germany

Prof Rene PINNAU

Greece

Prof Vasileios KOSTOGLOU

Greece

Dr Nikolaus PLOSKAS

Hungary

Dr András BÁTKAI

Hungary

Prof Istvan FARAGO

Ireland

Dr Miguel BUSTAMANTE

Ireland

Dr William LEE

Israel

Dr Yirmeyahu KAMINSKI

Israel

Dr Aviv GIBALI

Italy

Prof Alessandra MICHELETTI

Italy

Dr Rada NOVAKOVIC

Lithuania

Prof Raimondas CIEGIS

Netherlands

Dr Vivi ROTTSCHAFER

Netherlands

Prof Wilhelmus SCHILDERS

Norway

Prof Elena CELLEDONI

Norway

Dr Svenn Anton HALVORSEN

Poland

Prof Wojciech OKRASINSKI

Poland

Dr Agnieszka WYLOMANSKA

Portugal

Prof Adérito ARAÚJO

Portugal

Ms Margarida PINA

Romania

Prof Costica MOROSANU

Romania

Dr Ionut PORUMBEL

Serbia

Prof Natasa KREJIC

Serbia

Prof Ivan OBRADOVIC

Slovakia

Dr Peter FROLKOVIC

Slovakia

Prof Karol MIKULA

Slovenia

Prof Janez POVH

Spain

Prof Tim MYERS

Spain

Prof Peregrina QUINTELA ESTÉVEZ

Sweden

Dr Hanifeh KHAYYERI

Sweden

Prof Johan HOFFMAN

Switzerland

Dr Joerg OSTERRIEDER

Switzerland

Prof Wolfgang BREYMANN

Turkey

Prof Enis KAYIS

United Kingdom

Dr Robert LEESE

United Kingdom

Dr Hilary OCKENDON

**Team members (UNIOS):**Kristian Sabo, Krešimir Burazin**Project duration:**5 May 2015 – 4 May 2019 - "Optimization of parameter dependent mechanical systems", (Department of Mathematics, J. J. Strossmayer University of Osijek - Croatian Science Foundation) - Project coordinator: Ninoslav Truhar
**Summary:**This project is devoted to second order mechanical systems which are described by a system of differential equations: M x''(t) + D x'(t)+ K x(t) =B f(t)+E w(t), x0=x(0), v0=x'(0), where M, D, K are semidefinite Hermitian large – scale matrices, dependent on one or more real parameters, while B and E are full rank matrices with p and q columns, respectively, much smaller than n. Although the above systems have been widely investigated, there are still many interest open problems from theoretical point of view, but also from the applications itself. One of such problems is optimization of a small rank damping of different kind (passive, viscose, semi-active) from which follow open problems as positioning of dampers, optimal number of dampers, optimal dampers characteristics, etc. The majority of the research within this project will therefore be focused to: optimization of active and passive damping and optimal control of parameter dependent mechanical systems with and without external force; describing the properties of eigenvalues and eigenvectors of the corresponding parameter-dependent quadratic eigenvalue problem as well as corresponding parameter-dependent nonlinear eigenvalue problems.

Within the problem of active and passive damping optimization and optimal control of parameter dependent mechanical systems with and without external force, we will develop a general theoretical framework which describe many important system properties, and we will construct the corresponding numerical algorithms for the calculation of desired quantites. These theoretical considerations will be related to the optimization of various damping parameters with respect to several different optimization criteria as e.g.: spectral abscissa optimization, optimization of total average energy of the system, optimization of average amplitude of displacement, optimization of average amplitude of energy and impulse response energy. Furthermore, within the stated objectives we will solve many numerical demanding problems, for example: mixed-integer nonlinear optimization problem, efficiently solving of large matrix equations (Lyapunov, Sylvester, Riccati), improving the optimization algorithms by dimension reduction. We will also consider theoretical and numerical aspects of optimization of semi-active damping problem and optimal control based on various criteria (minimization of H_2, H_infinity norms, etc.).

Within the problem of describing the behaviour of eigenvalues and eigenvectors of the parameter-dependent quadratic eigenvalue problems, we will develop perturbation theory for the corresponding quadratic problem where we will separately consider cases when M, D, K are semidefinite Hermitian matrices, and corresponding linearized pair is diagonalizable (this means that eigenvalues of quadratic eigenvalue problem can be complex) and so called overdamped case, i.e. the case when the corresponding linearized pair is definite. Further, we plan to generalize the obtained results on the parameter dependent nonlinear eigenvalue problem. For all cases we will develop perturbation theory which will contain perturbation bounds of absolute and relative type for the eigenvalues and associated eigenvectors i.e. subspaces.

Since the stated problems are closely related, insight into the behaviour of eigenvalues and corresponding eigenvectors will allow better understanding of the damping, or other parts of the mechanical systems, while the better understanding of optimal damping or parameters in mechanical system will clarify some important properties of mechanical systems, such as overdampness, stability etc.**Programme:**Croatian Science Foundation**Project partners:**Prof. dr. sc. Peter Benner, Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg, Germany

Prof. dr. sc. Ivan Slapničar, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split

Dr. sc. Nevena Jakovčević Stor, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split

Jonas Denißen, Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg, Germany**Project members:**prof. dr. sc. Ninoslav Truhar, doc. dr. sc. Zoran Tomljanović, dr. sc. Ivana Kuzmanović, dr. sc. Suzana Miodragović**Project duration:**1. 7. 2015. – 30. 6. 2019.