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Hire Dr. Aleksandar K.

Serbia

USD 100 /hr

Professor at University of Belgrade | PhD in CS | Optimization and machine learning | Building software since 2008

Profile Summary

I am an Associate Professor of Computer Science at the Faculty of Mathematics, University of Belgrade. I earned my PhD in 2014, focusing on the application of optimization algorithms to enhance the classification process through feature selection and feature weighting. Over the course of my career, I have authored more than 40 research papers, including approximately 20 published in impact-factor journals, most of which fall into the category of exceptional (or Q1). My primary research areas are optimization and machine learning. In the field of optimization, I specialize in the development of both exact and heuristic techniques, such as integer (linear) programming models, branch and bound, beam search, variable neighborhood search, and genetic algorithms. These techniques have been applied to address complex, NP-hard problems across diverse domains, including computational biology, transportation, logistics, and social networks. In machine learning, I have extensive experience with a wide range of methods and applications, including classification, regression, cluster analysis, and dimensionality reduction. My research has a particular focus on symbolic regression, for which I developed one of the most effective algorithms in the literature. More recently, I have been actively exploring deep learning and large language models, broadening my expertise in contemporary AI techniques. Throughout my career, I have contributed to the development of approximately 30 software solutions, with a growing emphasis in recent years on science-oriented projects. Currently, my focus lies primarily on creating scientific prototypes; however, I am equally open to developing fully functional, production-ready solutions.

Subject Matter Expertise

• ★ Machine Learning
• ★ Artificial Intelligence
• ★ Mathematical Optimization
• ☆ Computational Biology
• ☆ Computer Science
• ☆ Data Analysis
• ☆ Social Network Analysis
• ☆ Computer Simulation/Computational Modeling
• ☆ Algorithm Design
• ☆ Predictive Modeling & Analytics
• ☆ Data Processing
• ☆ Data Exploration
• ☆ Cluster Analysis
• ☆ Data Visualization
• ☆ Big Data Analytics
• ☆ Data Collection
• ☆ Data Management
• ☆ Data Manipulation
• ☆ Text Mining & Analytics
• ☆ Data Mining
• ☆ Data Cleaning
• ☆ Natural Language Processing
• ☆ Data Architecture
• ☆ Neural Networks
• ☆ Pattern Recognition
• ☆ Deep Learning
• ☆ Statistics
• ☆ Applied Statistics
• ☆ Comparative Analysis
• ☆ Regression Analysis
• ☆ Nonlinear Regression
• ☆ Applied Mathematics
• ☆ Mathematical Models
• ☆ Pure Mathematics
• ☆ Graph Theory
• ☆ Discrete Mathematics
• ☆ Decision Science
• ☆ Information Retrieval
• ☆ Computer Science Education
• ☆ Python
• ☆ SPSS
• ☆ Matlab
• ☆ SQL
• ☆ Excel
• ☆ Java
• ☆ LaTex
• ☆ Scikit-learn
• ☆ Markup Languages
• ☆ Software Development
• ☆ Mobile Application Development
• ☆ Desktop Application Development
• ☆ Web Application Development
• ☆ Hypothesis
• ☆ Peer Review
• ☆ Research Methodology

Services

• Writing
• Research
• Consulting
• Data & AI
• Product Development

Writing General Proofreading & Editing

Research Scientific and Technical Research, Systematic Literature Review

Consulting Scientific and Technical Consulting

Data & AI Predictive Modeling, Statistical Analysis, Algorithm Design-Non ML, Algorithm Design-ML, Data Visualization, Big Data Analytics, Text Mining & Analytics, Data Mining, Data Cleaning, Data Processing, Data Insights

Product Development Prototyping

Work Experience

Associate Professor

University of Belgrade, Faculty of Mathematics

October 2023 - Present

Guest Professor

University of Banjaluka, Faculty of Natural Science and Mathematics

October 2018 - Present

Owner / Founder

Agency for Software Development, Kartelj PR

May 2018 - Present

Assistant Professor (tenured)

University of Belgrade, Faculty of Mathematics

October 2015 - October 2023

Teaching Assistant

University of Belgrade, Faculty of Mathematics

October 2008 - October 2015

Education

PhD Computer Science

University of Belgrade, Faculty of Mathematics

October 2010 - October 2014

MS Computer Science

University of Belgrade, Faculty of Mathematics

October 2008 - October 2010

BS in Computer Science

University of Belgrade, Faculty of Mathematics

October 2005 - October 2008

Certifications

• Certification details not provided.

Publications

JOURNAL ARTICLE

Aleksandar Kartelj, Marko Djukanović, Stefan Kapunac, Dragan Matić (2025). Graph protection under multiple simultaneous attacks: A heuristic approach . Knowledge-Based Systems.

Aleksandar Kartelj, Vladimir Filipovic, Jozef Kratica (2024). Integer programming model for distance-edge-monitoring problem . Yugoslav Journal of Operations Research.

Kartelj, Aleks, ar, Djukanović, Marko(2023). RILS-ROLS: Robust Symbolic Regression via Iterated Local Search and Ordinary Least Squares. Journal of Big Data. 10. (1). p. 71. Springer

Babović, Zoran, Bajat, Branislav, Barac, Dusan, Bengin, Vesna, Đokić, Vladan, Đorđević, Filip, Drašković, Dražen, Filipović, Nenad, French, Stephan, Furht, Borko, et al.(2023). Teaching computing for complex problems in civil engineering and geosciences using big data and machine learning: synergizing four different computing paradigms and four different management domains. Journal of Big Data. 10. (1). p. 89. Springer

Babović, Zoran, Bajat, Branislav, Đokić, Vladan, Đorđević, Filip, Drašković, Dražen, Filipović, Nenad, Furht, Borko, Gačić, Nikola, Ikodinović, Igor, Ilić, Marija, et al.(2023). Research in computing-intensive simulations for nature-oriented civil-engineering and related scientific fields, using machine learning and big data: an overview of open problems. Journal of Big Data. 10. (1). p. 1--21. SpringerOpen

Djukanovic, Marko, Kartelj, Aleks, ar, Blum, Christian(2023). Self-Adaptive Cmsa for Solving the Multidimensional Multi-Way Number Partitioning Problem. Expert Systems with Applications. p. 120762. Elsevier

Kapunac, Stefan, Kartelj, Aleks, ar, Djukanovic, Marko(2023). Variable Neighborhood Search for Weighted Total Domination Problem and Its Application in Social Network Information Spreading. Applied Soft Computing. 143. p. 110387. Elsevier

Filipović, Vladimir, Matić, Dragan, Kartelj, Aleks, ar(2022). Solving the signed Roman domination and signed total Roman domination problems with exact and heuristic methods. arXiv preprint arXiv:2201.00394.

Grbić, Milana, Crnogorac, Vukašin, Predojević, Milan, Kartelj, Aleks, ar, Matić, Dragan(2022). Supportness of the protein complex standards in PPI networks. Journal of Information and Telecommunication. 6. (1). p. 6--26. Taylor \& Francis

Djukanović, Marko, Kartelj, Aleks, ar, Matić, Dragan, Grbić, Milana, Blum, Christian, Raidl, Günther R(2022). Graph search and variable neighborhood search for finding constrained longest common subsequences in artificial and real gene sequences. Applied Soft Computing. 122. p. 108844. Elsevier

Aleksandar Kartelj, Bojan Nikolic, Marko Djukanovic, Milana Grbic, Christian Blum, Günther Raidl (2021). Solving the Longest Common Subsequence Problem Concerning Non-Uniform Distributions of Letters in Input Strings . Mathematics.

Aleksandar Kartelj, Milana Grbic, Dragan Matic, Vladimir Filipovic (2021). The Roman domination number of some special classes of graphs - convex polytopes . Applicable Analysis and Discrete Mathematics.

Grbić, Milana, Gemović, Branislava, Davidović, Radoslav, Kartelj, Aleks, ar, Matić, Dragan(2021). Prediction of GO terms for IDPs based on highly connected components in PPI networks. 431112

Nikolic, Bojan, Kartelj, Aleks, ar, Djukanovic, Marko, Grbic, Milana, Blum, Christian, Raidl, Günther(2021). Solving the Longest Common Subsequence Problem Concerning Non-Uniform Distributions of Letters in Input Strings. Mathematics. 9. (13). p. 1515. MDPI

Kartelj, Aleks, ar, Grbić, Milana, Matić, Dragan, Filipović, Vladimir(2021). The roman domination number of some special classes of graphs-convex polytopes. Applicable Analysis and Discrete Mathematics. 15. (2). p. 393--412. University of Belgrade, Serbia

Aleksandar Kartelj, Milana Grbić, Savka Janković, Dragan Matić, Vladimir Filipović (2020). Variable Neighborhood Search for Partitioning Sparse Biological Networks into the Maximum Edge-Weighted k-Plexes . IEEE/ACM Transactions on Computational Biology and Bioinformatics.

Kartelj, Aleks, ar, Filipović, Vladimir, Vrećica, Siniša, Živaljević, Rade(2020). Topologically sensitive metaheuristics. arXiv preprint arXiv:2002.11164.

Grbić, Milana, Matić, Dragan, Kartelj, Aleks, ar, Vračević, Savka, Filipović, Vladimir(2020). A three-phase method for identifying functionally related protein groups in weighted PPI networks. Computational biology and chemistry. 86. p. 107246. Elsevier

Kratica, Jozef, Filipovic, Vladimir, Matic, Dragan, Kartelj, Aleks, ar(2019). An integer linear programming formulation for the convex dominating set problems. arXiv preprint arXiv:1904.02541.

(2019). Variable neighborhood search for partitioning sparse biological networks into the maximum edge-weighted k-plexes . IEEE/ACM Transactions on Computational Biology and Bioinformatics.

Filipović, V., Kartelj, A., Kratica, J.(2019). Edge Metric Dimension of Some Generalized Petersen Graphs . Results in Mathematics. 74. (4).

Š, rih, Branislava, Filipović, Vladimir, Malkov, Saša, Kartelj, Aleks, ar(2017). DISTRIBUTED COMPUTING AMONG INDEPENDENT WEB BROWSERS APPLIED TO TEXT AND IMAGE PROCESSING.

Kartelj, A.(2015). An improved electromagnetism-like method for feature selection . Journal of Multiple-Valued Logic and Soft Computing. 25. (2-3). p. 169-187.

Kartelj, Aleks, ar, Dražic, Zorica, Mladenovic, Nenad(2015). Basic variable neighborhood search for the bipartite unconstrained 0-1 quadratic programming problem. PROCEEDINGS (ZBORNIK RADOVA). p. 241.

Kartelj, A., Šurlan, N., Cekić, Z.(2014). Case-based reasoning and electromagnetism-like method in construction management . Kybernetes. 43. (2). p. 265-280.

Kartelj, Aleks, ar(2014). Primene metaheuristike zasnovane na elektromagnetizmu u rešavanju problema klasifikacije. Beograd

Kartelj, A., Mitić, N., Filipović, V., Tošić, D.(2014). Electromagnetism-like algorithm for support vector machine parameter tuning . Soft Computing. 18. (10). p. 1985-1998.

Filipovíc, V., Kartelj, A., Matíc, D.(2013). An electromagnetism metaheuristic for solving the maximum betweenness problem . Applied Soft Computing Journal. 13. (2). p. 1303-1313.

Kartelj, A.(2013). Electromagnetism metaheuristic algorithm for solving the strong minimum energy topology problem . Yugoslav Journal of Operations Research. 23. (1). p. 43-57.

Kartelj, Aleks, ar, Filipovi, Vladimir, Milutinovi, Veljko(2012). AUTOMATIZOVANA KLASIFIKACIJA LI NOSTI AUTOMATED PERSONALITY CLASSIFICATION.

Kartelj, Aleks, ar(2010). Classification of Smoking Cessation Status Using Various Data Mining Methods. Mathematica Balkanica New Series. 24. (3-4). p. 199--205. Bulgarian Academy of Sciences-National Committee for Mathematics

PREPRINT

Aleksandar Kartelj, Miljana Mladenovic, Stasa Vujicic Stankovic (2024). Comparison of Algorithms for the Recognition of ChatGPT Paraphrased Texts .

BOOK CHAPTER

Aleksandar Kartelj, Marko Djukanović, Tome Eftimov, Jaume Reixach, Christian Blum (2024). Efficient Search Algorithms for the Restricted Longest Common Subsequence Problem .

Banković, M., Filipović, V., Graovac, J., Hadži-Purić, J., Hurson, A.R., Kartelj, A., Kovačević, J., Korolija, N., Kotlar, M., Krdžavac, N.B., et al.(2019). Teaching graduate students how to review research articles and respond to reviewer comments . Advances in Computers.

CONFERENCE PAPER

Aleksandar Kartelj, Milan Predojević, Marko Djukanović (2023). Variable neighborhood search for solving the k-domination problem .

Djukanovic, Marko, Matic, Dragan, Blum, Christian, Kartelj, Aleks, ar(2022). Application of A∗ to the Generalized Constrained Longest Common Subsequence Problem with Many Pattern Strings. Pattern Recognition and Artificial Intelligence: Third International Conference, ICPRAI 2022, Paris, France, June 1--3, 2022, Proceedings, Part II. p. 53--64.

Zec, Tatjana, Kartelj, Aleks, ar, Djukanović, Marko, Grbić, Milana, Matić, Dragan(2021). Statistical analysis of correlation between weather parameters and new COVID-19 cases: a case study of Bosnia and Herzegovina. 2021 International Conference on INnovations in Intelligent SysTems and Applications (INISTA). p. 1--6.

Grbić, Milana, Crnogorac, Vukašin, Predojević, Milan, Kartelj, Aleks, ar, Matić, Dragan(2020). How well are known protein complexes supported in PPI networks?. 2020 International Conference on INnovations in Intelligent SysTems and Applications (INISTA). p. 1--7.

Grbic, Milana, Kartelj, Aleks, ar, Matic, Dragan, Filipovic, Vladimir(2016). Improving 1NN strategy for classification of some prokaryotic organisms. Belgrade BioInformatics Conference 2016. p. 55.

Kartelj, A., Filipović, V., Milutinović, V.(2012). Novel approaches to automated personality classification: Ideas and their potentials . MIPRO 2012 - 35th International Convention on Information and Communication Technology, Electronics and Microelectronics - Proceedings. p. 1017-1022.

BOOK

Aleksandar Kartelj, Veljko Milutinović, Nenad Mitić, Miloš Kotlar (2022). Implementation of Machine Learning Algorithms Using Control-Flow and Dataflow Paradigms .

OTHER

Kartelj, Aleks, ar, Kotlar, Miloš, others(2022). Implementation of Machine Learning Algorithms Using Control-Flow and Dataflow Paradigms. IGI Global