Dragan Jukić
Full Professor Department of Mathematics Josip Juraj Strossmayer University of Osijek Trg Ljudevita Gaja 6 Osijek, HR31000, Croatia

Research Interests
 As a mathematician, my fields of interest are numerical and applied mathematics. Specifically, my research focuses on the following areas:

 Parameter estimation

 Nonlinear least squares problems

 Curve fitting

 Smoothing methods

 Mathematical modelling
Degrees
 PhD in mathematics, Department of Mathematics, University of Zagreb, 1996.
 MSc in mathematics, Department of Mathematics, University of Zagreb, 1990.
 BSc in Mathematics and Physics, Josip Juraj Strossmayer University of Osijek, 1986.
Publications
 Dragan Jukić, A simple proof of the existence of the best estimator in a quasilinear regression model, Journal of optimization theory and applications 162 (2014), 293302We provide a theorem on the existence of the best estimator in a quasilinear regression model, from which the existence of the best estimator for the whole class of nonlinear model functions follows immediately. The obtained theorem both extends and generalizes the previously known existence result. Our proof is elementary and rests on the basic knowledge of linear algebra and calculus.
 Darija Marković, Dragan Jukić, Total least squares fitting the threeparameter inverse Weibull density, European Journal of Pure and Applied Mathematics 7/3 (2014), 230245The focus of this paper is on a nonlinear weighted total least squares fitting problem for the threeparameter inverse Weibull density which is frequently employed as a model in reliability and lifetime studies. As a main result, a theorem on the existence of the total least squares estimator is obtained, as well as its generalization in the l_q norm (1≤q<∞).
 Dragan Jukić, On nonlinear weighted least squares estimation of Bass diffusion model, Applied mathematics and computation 219/14 (2013), 78917900The Bass model is one of the most wellknown and widely used models of firstpurchase demand. Estimation of its parameters has been approached in the literature by various techniques. The focus of this paper is on a nonlinear weighted least squares fitting approach. As a main result, two theorems on the existence of the least squares estimate are obtained. One of them gives necessary and sufficient conditions which guarantee the existence of the least squares estimate. Some numerical experiments are given to illustrate the efficiency of our approach.
 Darija Marković, Dragan Jukić, On parameter estimation in the bass model by nonlinear least squares fitting the adoption curve, International Journal of Applied Mathematics and Computer Science 23/1 (2013), 145155The Bass model is one of the most wellknown and widely used firstpurchase diffusion models in marketing research. Estimation of its parameters has been approached in the literature by various techniques. In this paper, we consider the parameter estimation approach for the Bass model based on nonlinear weighted least squares fitting of its derivative known as the adoption curve. We show that it is possible that the least squares estimate does not exist. As a main result, two theorems on the existence of the least squares estimate are obtained, as well as their generalization in the ls norm (1 ≤ s < ∞). One of them gives necessary and sufficient conditions which guarantee the existence of the least squares estimate. Several illustrative numerical examples are given to support the theoretical work.
 Dragan Jukić, On the $l_s$norm generalization of the NLS method for the Bass model, European Journal of Pure and Applied Mathematics 6/4 (2013), 435450The bestknown and widely used model in diffusion research is the Bass model. Estimation of its parameters has been approached in the literature by various methods, among which a very popular one is the nonlinear least squares (NLS) method proposed by Srinivasan and Mason. In this paper, we consider the l_snorm (1≤s<∞) generalization of the NLS method for the Bass model. Our focus is on the existence of the corresponding best l_s norm estimate. We show that it is possible for the best l_snorm estimate not to exist. As a main result, two theorems on the existence of the best l_s norm estimate are obtained. One of them gives necessary and sufficient conditions which guarantee the existence of the best l_snorm estimate.
 Dragan Jukić, The L_pnorm estimation of the parameters for the JelinskiMoranda model in software reliability, Croatian Journal of Education 89 (2012), 467481The exponential model of Jelinski and Moranda [Software reliability research, in Statistical Computer Performance Evaluation, W. Freiberg, ed., Academic Press, New York, 1972, pp. 465–484] is one of the earliest models proposed for predicting software reliability. The estimation of its parameters has been approached in the literature by various techniques. The focus of this paper is on the L p norm (1≤p<∞) fitting approach. Special attention is paid to the nonlinear weighted least squares (LS) estimation. We show that it is possible for the best L p norm estimate to not exist. As the main result, a necessary and sufficient condition for the existence of the best L p norm estimate is obtained. This condition is theoretical in nature. We apply it to obtain two theorems on the existence of the LS estimate. One of them gives the necessary and sufficient conditions which guarantee the existence of the LS estimate. To illustrate the problems arising with the nonlinear normal equation approach for solving the LS problem, some illustrative examples are included.
 Dragan Jukić, Total least squares fitting Bass diffusion model, Mathematical and Computer Modelling 53/910 (2011), 17561779This paper is concerned with the Bass model, which is widely used as a firstpurchase diffusion model in marketing research. Estimation of its parameters has been approached in the literature by various techniques. In this paper, we consider the nonlinear weighted total least squares (TLS) fitting approach. We show that it is possible that the TLS estimate does not exist. As a main result, two theorems on the existence of the total least squares estimate are obtained, as well as their generalization in the total l_s norm (1≤s<∞). Several illustrative numerical examples are given to illustrate the efficiency of our approach.
 Miljenko Marušić, Darija Marković, Dragan Jukić, Least squares fitting the threeparameter inverse Weibull density, Mathematical Communications 15/2 (2010), 539553The inverse Weibull model was developed by Erto [10]. In practice, the unknown parameters of the ppropriate inverse Weibull density are not known and must be estimated from a random sample. Estimation of its parameters has been approached in the literature by various techniques, because a standard maximum likelihood estimate does not exist. To estimate the unknown parameters of the threeparameter inverse Weibull density we will use a combination of onparametric and parametric methods. The idea consists of using two steps: in the first step we calculate an initial nonparametric density estimate which needs to be as good as possible, and in the second step we apply the nonlinear least squares method to estimate the unknown parameters. As a main result, a theorem on the existence of the least squares estimate is obtained, as well as its generalization in the l_p norm (1 p < 1). Some simulations are given to show that our approach is satisfactory if the initial density is of good enough quality.
 Dragan Jukić, Darija Marković, On nonlinear weighted errorsinvariables parameter estimation problem in the threeparameter Weibull model, Applied mathematics and computation 215/10 (2010), 35993609This paper is concerned with the threeparameter Weibull distribution which is widely used as a model in reliability and lifetime studies. In practice, the Weibull model parameters are not known in advance and must be estimated from a random sample. Difficulties in applying the method of maximum likelihood to threeparameter Weibull models have led to a variety of alternative approaches in the literature. In this paper we consider the nonlinear weighted errorsinvariables (EIV) fitting approach. As a main result, two theorems on the existence of the EIV estimate are obtained. An illustrative example is also included.
 Dragan Jukić, Darija Marković, On nonlinear weighted least squares fitting of the threeparameter inverse Weibull distribution, Mathematical Communications 15/1 (2010), 1324In this paper we consider nonlinear least squares fitting of the threeparameter inverse Weibull distribution to the given data (wi; ti; yi), i = 1,...,n, n>3. As the main result, we show that the least squares estimate exists provided that the data satisfy just the following two natural conditions: (i) 0
 Darija Marković, Dragan Jukić, On nonlinear weighted total least squares parameter estimation problem for the threeparameter Weibull density, Applied Mathematical Modelling 34/7 (2010), 18391848The threeparameter Weibull density function is widely employed as a model in reliability and lifetime studies. Estimation of its parameters has been approached in the literature by various techniques, because a standard maximum likelihood estimate does not exist. In this paper we consider the nonlinear weighted total least squares fitting approach. As a main result, a theorem on the existence of the total least squares estimate is obtained, as well as its generalization in the total l_q norm ($qgeq 1$). Some numerical simulations to support the theoretical work are given.
 Darija Marković, Dragan Jukić, Mirta Benšić, Nonlinear weighted least squares estimation of a threeparameter Weibull density with a nonparametric start, Journal of Computational and Applied Mathematics, 228/1 (2009), 304312This paper is concerned with the parameter estimation problem for the threeparameter Weibull density which is widely employed as a model in reliability and lifetime studies. Our approach is a combination of nonparametric and parametric methods. The basic idea is to start with an initial nonparametric density estimate which needs to be as good as possible, and then apply the nonlinear least squares method to estimate the unknown parameters. As a main result, a theorem on the existence of the least squares estimate is obtained. Some simulations are given to show that our approach is satisfactory if the initial density is of good enough quality.
 Dragan Jukić, On the existence of the best discrete approximation in $l_p$ norm by reciprocals of real polynomials, Journal of Approximation Theory 156/2 (2009), 212222For the given data (wi,xi,yi), i=1,…,M, we consider the problem of existence of the best discrete approximation in l_p norm (1≤p<∞) by reciprocals of real polynomials. For this problem, the existence of best approximations is not always guaranteed. In this paper, we give a condition on data which is necessary and sufficient for the existence of the best approximation in $l_p$ norm. This condition is theoretical in nature. We apply it to obtain several other existence theorems very useful in practice. Some illustrative examples are also included.
 Dragan Jukić, Mirta Benšić, Rudolf Scitovski, On the existence of the nonlinear weighted least squares estimate for a threeparameter Weibull distribution, Computational Statistics & Data Analysis 52/9 (2008), 45024511The problem of nonlinear weighted least squares fitting of the threeparameter Weibull distribution to the given data (wi,ti,yi), i=1,…,n, is considered. The part wi>0 of the data stands for the data weights. It is shown that the best least squares estimate exists provided that the data satisfy just the following two natural conditions: (i) 0
 Dragan Jukić, Kristian Sabo, Rudolf Scitovski, A review of existence criteria for parameter estimation of the MichaelisMenten regression model, Annali dell'Universita' di Ferrara 53 (2007), 281291In this paper we consider the least squares (LS) and total least squares (TLS) problems for a MichaelisMenten enzyme kinetic model $f(x ; a, b)=ax/(b+x)$, $a, b>0$. In various applied research such as biochemistry, pharmacology, biology and medicine there are lots of different applications of this model. We will systematize some of our results pertaining to the existence of the LS and TLS estimate, which were proved in papers [16] and [17]. Finally, we suggest a choice of good initial approximation and give one numerical example.
 KarlPeter Hadeler, Dragan Jukić, Kristian Sabo, Least squares problems for Michaelis Menten kinetics, Mathematical Methods in the Applied Sciencies 30 (2007), 12311241The MichaelisMenten kinetics is fundamental in chemical and physiological reaction theory. The problem of parameter identification, which is not wellposed for arbitrary data, is shown to be closely related to the Chebyshev sum inequality. This inequality yields sufficient conditions for existence of feasible solutions both for nonlinear and for linear least squares problems. The conditions are natural and practical as they are satisfied if the data show the expected monotone and concave behavior.
 Dragan Jukić, Rudolf Scitovski, Kristian Sabo, Total least squares fitting MichaelisMenten enzyme kinetic model function, Journal of Computational and Applied Mathematics, 201 (2007), 230246The MichaelisMenten enzyme kinetic model $f(x ; a, b)=ax/(b+x)$, $a, b>0$, is widely used in biochemistry, pharmacology, biology and medical research. Given the data $(p_i, x_i, y_i)$, $i=1, ldots, m$, $mgeq 3$, we consider the total least squares (TLS) problem for the MichaelisMenten model. We show that it is possible that the TLS estimate does not exist. As the main result, we show that the TLS estimate exists if the data satisfy some natural conditions. Some numerical examples are included.
 Dragan Jukić, Rudolf Scitovski, Least squares fitting Gaussian type curve, Applied mathematics and computation 167/1 (2005), 286298Given the data (pi, ti, yi), i = 1, …, m, m ⩾ 3, we give necessary and sufficient conditions which guarantee the existence of the weighted least squares estimate for a Gaussian type function. To this end, we suggest a choice of the suitable initial approximation for an iterative minimization, and give some numerical examples.
 Dragan Jukić, A necessary and sufficient criteria for the existence of the least squares estimate for a 3parametric exponential function, Applied mathematics and computation 147/1 (2004), 117Given the data (pi,ti,yi), i=1,…,m, m⩾3, we give necessary and sufficient conditions which guarantee the existence of the least squares estimate for a 3parametric exponential function. To this end, we suggest a choice of the initial approximation and give some numerical examples.
 Dragan Jukić, Gordana Kralik, Rudolf Scitovski, Least squares fitting Gompertz curve, Journal of Computational and Applied Mathematics, 169/2 (2004), 359375In this paper we consider the leastsquares (LS) fitting of the Gompertz curve to the given nonconstant data (pi,ti,yi), i=1,…,m, m⩾3. We give necessary and sufficient conditions which guarantee the existence of the LS estimate, suggest a choice of a good initial approximation and give some numerical examples.
 Dragan Jukić, Rudolf Scitovski, Solution of the leastsquares problem for logistic function, Journal of Computational and Applied Mathematics, 156/1 (2003), 159177Given the data (pi,ti,fi), i=1,…,m, m>3, we consider the best leastsquares approximation of parameters for the logistic function . We give necessary and sufficient conditions which guarantee the existence of such optimal parameters.
 Rudolf Scitovski, Dragan Jukić, Igor Urbiha, Solving the parameter identification problem by using $TL_p$ spline, Mathematical Communications  Supplement 1/1 (2001), 8191
 Dragan Jukić, Rudolf Scitovski, The best least squares approximation problem for a 3parametric exponential regression model, ANZIAM Journal 42/2 (2000), 254266Given the data (pi, ti, fi), i = 1,…,m, we consider the existence problem for the best least squares approximation of parameters for the 3parametric exponential regression model. This problem does not always have a solution. In this paper it is shown that this problem has a solution provided that the data are strongly increasing at the ends.
 Rudolf Scitovski, Dragan Jukić, Analysis of solutions of the least squares problem, Mathematical Communications 4/1 (1999), 5361For the given data $(p_i,t_i,f_i),$ $i=1,ldots,m$, we consider the existence problem of the best parameter approximation of the exponential model function in the sense of ordinary least squares and total least squares. Results related to that problem which have been obtained and published by the authors so far are given in the paper, as well as some new results on nonuniqueness of the best parameter approximation.
 Dragan Jukić, Rudolf Scitovski, Helmuth Späth, Partial linearization of one class of the nonlinear total least squares problem by using the inverse model function, Computing 62/2 (1999), 163178In this paper we consider a special nonlinear total least squares problem, where the model function is of the form f(x;a,b)=ϕ−1(ax+b) . Using the fact that after an appropriate substitution, the model function becomes linear in parameters, and that the symmetry preserves the distances, this nonlinear total least squares problem can be greatly simplified. In this paper we give the existence theorem, propose an efficient algorithm for searching the parameters and give some numerical examples.
 Rudolf Scitovski, Šime Ungar, Dragan Jukić, Approximating surfaces by moving total least squares method, Applied mathematics and computation 93/23 (1998), 219232We suggest a method for generating a surface approximating the given data (xi, yi, zi) ϵ R^3, i = 1, …. m, assuming that the errors can occur both in the independent variables x and y, as well as in the dependent variable z. Our approach is based on the moving total least squares method, where the local approximants (local planes) are determined in the sense of total least squares. The parameters of the local approximants are obtained by finding the eigenvector, corresponding to the smallest eigenvalue of a certain symmetric matrix. To this end, we develop a procedure based on the inverse power method. The method is tested on several examples.
 Dragan Jukić, Tomislav Marošević, Rudolf Scitovski, Discrete total lpnorm approximation problem for the exponential function, Applied mathematics and computation 94/23 (1998), 137143In this paper we consider the total lpnorm (p > 0) approximation problem for the exponential function. We give sufficient conditions which guarantee the existence of such optimal parameters.
 Dragan Jukić, Rudolf Scitovski, Existence results for special nonlinear total least squares problem, Journal of Mathematical Analysis and Applications 226/2 (1998), 348363In this paper we prove an existence theorem for a special nonlinear total least squares problem. We show that the optimal parameters of the generalized logistic function exist in the sense of total least squares, provided the data satisfy the Chebyshev's inequality.
 Tomislav Marošević, Dragan Jukić, Least orthogonal absolute deviations problem for exponential function, Student 2/2 (1997), 131138We consider the existence problem of the optimal parameters for the exponential function, in the sense of the least orthogonal absolute deviations, and prove the existence of such optimal parameters for monotic data.
 Dragan Jukić, Rudolf Scitovski, Existence of optimal solution for exponential model by least squares, Journal of Computational and Applied Mathematics, 78/2 (1997), 317328In this paper we prove the existence theorem for the best least squares approximation of the optimal parameters for the exponential model function. We give sufficient conditions which guarantee the existence of such optimal parameters. Using these results and methods, we are able to localize a sufficiently narrow area where one can choose a good initial approximation.
 Dragan Jukić, Rudolf Scitovski, The existence of the optimal parameters of the generalized logistic function, Applied mathematics and computation 77/23 (1996), 281294The estimation of optimal parameters in a mathematical model described by the generalized logistic function with saturation level A and the asymmetry coefficient γ is a nonlinear least squares problem. In this paper we prove the existence of optimal parameters under considerably weaker conditions than those required in [1].
 Rudolf Scitovski, Dragan Jukić, A method for solving the parameter identification problem for ordinary differential equations of the second order, Applied mathematics and computation 74/23 (1996), 273291We give a method for solving the parameter identification problem for ordinary differential equations of the second order using a noninterpolated moving least squares method. The method is tested in two practical examples.
 Rudolf Scitovski, Dragan Jukić, Total least squares problem for exponential function, Inverse Problems 12/3 (1996), 341349Given the data (p_i,t_i,f_i), , i = 1,...,m, we consider the existence problem for the optimal parameters for the exponential function approximating these data in the sense of total least squares. We give sufficient conditions which guarantee the existence of such optimal parameters.
 Branimir Dukić, Drago Francišković, Dragan Jukić, Rudolf Scitovski, Mirta Benšić, Strategije otplate zajma, Financijska teorija i praksa (1994), 1526
 Darija Marković, Dragan Jukić, A review of some existence results on parameter estimation problem in the threeparameter Weibull model, 12th International Conference on Operational Research, Pula, Croatia, 2008, 103111
 Dragan Jukić, Rudolf Scitovski, Alfonzo Baumgartner, Kristian Sabo, Localization of the least squares estimate for twoparametric regression models, 10th International Conference on Operational Research KOI 2004, Trogir, 2005, 165174
 Dragan Jukić, Rudolf Scitovski, Kristian Sabo, Total least squares problem for the Hubbert function, Conference on Applied Mathematics and Scientific Computing, Brijuni, 2003, 217234
 Rudolf Scitovski, Gordana Kralik, Dragan Jukić, Radoslav Galić, Estimation of the saturation level and asymmetry coefficient of the generalized logistic model, 9th International Conference on Operational Research KOI 2002, Trogir, 2002, 5766
 Dragan Jukić, Kristian Sabo, Goran Bokun, Least squares problem for the Hubbert function, 9th International Conference on Operational Research KOI 2002, Trogir, 2002, 3746
 Dragan Jukić, Darija Marković, Mihaela Ribičić Penava, Andrea Krajina, On the choice of initial approximation of the least squares estimate in some growth models of exponential type, 9th International Conference on Operational Research KOI 2002, Trogir, 2002, 4755
 Dragan Jukić, Rudolf Scitovski, Šime Ungar, The best total least squares line in R^3, 7th International Conference on Operational Research KOI 1998, Rovinj, 1998, 311316
 Srečko Tomas, Dragan Jukić, Estimation of humid air properties by moving total least squares method, 7th International Conference on Operational Research KOI 1998, Rovinj, 1998, 9198
 Dragan Jukić, Miljenko Crnjac, Rudolf Scitovski, Surfaces generated by the noninterpolating moving least squares method, 4th International Symposium on Operations Research in Slovenia SOR’97, Preddvor, 1997, 189194
 Rudolf Scitovski, Šime Ungar, Dragan Jukić, Miljenko Crnjac, Moving total least squares for parameter identification in mathematical model, Symposium on Operations Research SOR '95, Passau, 1996, 196201
 Dragan Jukić, Rudolf Scitovski, The exponential growth model, 6th International Conference on Operational Research KOI 1996, Rovinj, 1996, 107112
 Rudolf Scitovski, Dragan Jukić, Ivica Bašić, Application of the moving least squares method in surface generating, 17th Int. Conf. Information Technology Interfaces, Cavtat, 1995, 469474
 Rudolf Scitovski, Tomislav Marošević, Dragan Jukić, Estimation of the optimal initial conditions in mathematical model, 17th Int. Conf. Information Technology Interfaces, Cavtat, 1995, 475480
 Dragan Jukić, Rudolf Scitovski, Miljenko Crnjac, Primjena metode potpunih najmanjih kvadrata za procjenu parametara u matematičkom modelu, 5th Conference on Operational Research KOI 1995, Rab, 1995, 99110
 Radoslav Galić, Rudolf Scitovski, Tomislav Marošević, Dragan Jukić, Problem optimalnih početnih uvjeta u matematičkom modelu, 5th Conference on Operational Research KOI 1995, Rab, 1995, 6271
 Rudolf Scitovski, Radoslav Galić, Ivan Kolund, Ivica Bašić, Dragan Jukić, Procjena rasprostiranja slojeva po dubini sondažnog profila, 5th Conference on Operational Research KOI 1995, Rab, 1995, 111120
 Miljenko Crnjac, Dragan Jukić, Rudolf Scitovski, Nove strategije otplate zajma, 4th Conference on Operational Research KOI 1994, Rab, 1994, 147154
 Dragan Jukić, Kristian Sabo, Najbolja aproksimacija rezultata eksperimentalnih mjerenja, Osječki matematički list 10 (1997)
 Dragan Jukić, The matrix of a linear operator in a pair of ordered bases, Mathematical Communications 2/1 (1997), 7782In the lecture it is shown how to represent a linear operator by a matrix. This representation allows us to define an operation with matrices.
 Dragan Jukić, Djeljivost cijelih brojeva, Osječki matematički list (1996), 4145
 Dragan Jukić, The existence theorem for the solution of a nonlinear least squares problems, Mathematical Communications 1/1 (1996), 6166In this paper we prove a theorem which gives necessary and sufficient conditions which guarantee the existence of the global minimum for a continuous real valued function bounded from below, which is defined on a noncompact set. The use of the theorem is illustrated by an example of the least squares problem.
 Dragan Jukić, The problem of the initial approximation for a special nonlinear least squares problems, Mathematical Communications 1/1 (1996), 2532In [6] the existence theorem for the best least squares approximation of parameters for the exponential function is proved. In this paper we consider the problem of choosing a good initial approximation of these parameters.
 Dragan Jukić, Rekurzivne relacije i potencije kvadratnih matrica , Ekonomski vjesnik 6/1 (1992), 133136
 Dragan Jukić, Rekurzivne relacije i potencije kvadratnih matrica, Ekonomski vjesnik 2 (1992), 133136
 Dragan Jukić, Uvod u LaTeX, Ekonomski vjesnik 1 (1989), 169178
 Dragan Jukić, Mjera i integral, Odjel za matematiku, Osijek, 2012.
 Dragan Jukić, Uvod u teoriju mjere i integracijeI dio, Odjel za matematiku, Osijek, 2008.
 Dragan Jukić, Rudolf Scitovski, Matematika I, Odjel za matematiku, Osijek, 1998.
 Miljenko Crnjac, Dragan Jukić, Rudolf Scitovski, Matematika, Ekonomski fakultet, Osijek, 1994.
Projects


2007 2013 head of scientific program (2352818) "Various aspects of parameter estimation problem in nonlinear mathematical models“ (Ministry of Science, Education and Sports)

2007 2013 head of scientific project (23523528181034) "Nonlinear parameter estimation problems in mathematical models“ (Ministry of Science, Education and Sports)

2002 2005  scientific project (0235001) "Parameter estimation in mathematical models“ (Department of Mathematics, University of Osijek  Ministry of Science, Education and Sports), investigator

1996  2000  scientific project (165021) "Parameter identification problems in mathematical models“ (Department of Mathematics, University of Osijek  Ministry of Science and Technology), investigator

19911995  scientific project (101129) "Application of numerical and finite mathematics“ (Ministry of Science, Technology and Computing), investigator

1986  1990  project task (2.08.01.03.02) "Operationalization of categories and relationships of value laws“ that was carried out within project (2.08.01) "Fundamental research in economy“ (Ministry of Science, Technology and Computing), investigator

Professional Activities
Editorial Boards
Mathematical Communications

Journal of Classical Analysis

Osječki matematički list

10^{th}^{ } International Conference on Operational Research (Trogir, Croatia, 2004), Editor
Committee Memberships

Member of the Scientific Committee of the international Conference on Applied Mathematics and Scientific Computing, 2013 (ApplMath13)
 Member of the Scientific Committee of the 5^{th} Croaatian Congress of Mathematics (Rijeka, 2012)

Member of the Scientific Committee of the international Conference on Applied Mathematics and Scientific Computing, 2011 (ApplMath11)

Member of the Scientific Committee of the international Conference on Applied Mathematics and Scientific Computing, 2009 (ApplMath09)

Member of the Scientific Committee of the 4^{th} Croaatian Congress of Mathematics (Osijek, 2008)

Member of the Organizing Committee of the International Conference on Operational Research, Croatian Operational Research Society (1996, 1998, 2000, 2002, 2004)

Member of the Program Committee of the International Conference on Operational Research, Croatian Operational Research Society (2000, 2002, 2004, 2006, 2008, 2010)

Member of the National Commission for Mathematics (since 2005)
Refereeing/Reviewing

Mathematical Communications

Journal of Classical Analysis

Osječki matematički list

AMS Mathematical Review
Periodically refereeing for journals:

Journal of Computational and Applied Mathematics

Mathematical and Computer Modelling

European Journal of Operational Research

Computational Statistics and Data Analysis

Communications in Statistics – Theory and Methods

International Journal of Mathematics and Mathematical Sciences

Information and Software Technology
Service Activities

Assistant Head of the Department of Mathematics, University of Osijek, 20072013

Head of the Department of Mathematics, University of Osijek, 2003 2007

ViceHead of the Department of Mathematics, University of Osijek, 19992003

Head of Engineering Section of the Croatian Mathematical SocietyDivision Osijek (since 1993)

Member of the National Commission for Mathematics (since 2005)
Teaching
Konzultacije (Office Hours): Srijeda (Wed) 11:30am. Konzultacije su moguće i po dogovoru.
Matematika 1 (Odjel za kemiju)
Matematika 2 (Odjel za kemiju)
Personal
 Birthdate: February 26, 1962
 Birthplace: Bračević (near Split), Croatia
 Citizenship: Croatian
 Family: Married, two children