Hatice Çalık

Operations Research Expert

I am a Research Expert in the Electrical Energy Systems and Applications (ELECTA) research unit at KU Leuven, Department of Electrical Engineering and EnergyVille.

My expertise lies in identifying Combinatorial Optimization and Operations Research (OR) problems in different real-world contexts, modeling them through mathematical formulations, and developing efficient and effective methods. My ultimate goal is to contribute to the improvement of the environment and the quality of human life.

I am particularly interested in addressing challenges in facility location, network design and routing (sequencing) decisions. My current primary research interests are on power system restoration. To name a few other specific applications, I have intensively focused on location of emergency facilities, distribution centers or hubs, electric vehicle recharging stations in combination with routing decisions and low voltage grid restrictions. I have also developed effective methods for several production planning, scheduling, container loading, angular and irregular cutting problems.

From a methodological point of view, I am specialized in developing efficient mathematical programming-based exact decomposition methods such as Branch-and-Cut and Benders Decomposition. When developing exact algorithms, I observed that effective integration of efficient lower and upper bounds as well as reduction techniques is an invaluable asset for the success of the algorithms. Further I investigated effectiveness of such improvement techniques when developing heuristics and observed considerable improvements also for the heuristics. Therefore, my research often focuses on hybrid frameworks combining mathematical models, heuristics (constructive, improvement) and approximation algorithms.

Numbers

Publications

Journal publications

Book chapters

Conference proceedings

Data sets

Invited talks

Conference talks

Resume

Hatice Çalık

Research Expert in Location Analysis and Mathematical Programming.

Education

PhD in Industrial Engineering

February 2009 - December 2013

Bilkent University, Ankara, Turkiye

My PhD thesis focused on development of exact methods for several variants of the p-center location problem. I developed novel mathematical formulations and efficient exact algorithms exploiting the particular structures of the underlying networks. I integrated the lower and upper bounds obtained from polynomial-time algorithms as well as several reduction rules to further improve the convergence of the algorithms.

Master of Science in Industrial Engineering

September 2006 - January 2009

Bilkent University, Ankara, Turkiye

My master thesis investigated the distribution network design for cargo delivery systems which aim at 24-hour delivery services. I developed a Tabu Search heuristic to obtain high quality solutions which do not require complete direct connections between selected hubs. This novel approach reduces system costs considerably, but imposes a huge challenge in finding feasible and high quality solutions.

Bachelor of Science in Industrial Engineering

August 2001 - May 2006

Bilkent University, Ankara, Turkiye

My senior bachelor project was an industrial project conducted at Turkish Aircraft Industries Inc.. In this one-year group project, we developed a heuristic algorithm to minimize the tardiness in a job-shop scheduling setting of parts fabrication for aircrafts. Our project was selected as finalist for the Industrial Project Award of the Turkish Operational Research Society in 2006.

Experience

Research Expert

August 2022 - Present

KU Leuven, Belgium

As an experienced researcher with a strong international network, I pursue research opportunities and initiate research collaborations around a variety of mono- and interdisciplinary real-world challenges. Although my main expertise is on Facility Location and Mathematical Programming domains of the Operations Research discipline, I also conduct research and teaching activities ranging from routing and scheduling to cutting and packing applications as well as heuristics to simulation methods. I document and disseminate my research outputs in the form of journal and conference publications. My expertise is well-recognized especially by the Location Analysis society which led to my election as Board Member of the EURO Working Group of Locational Analysis (EWGLA) in 2022. I am regularly invited for delivering lectures, talks, reviewing journal manuscripts and organizing conference sessions. Moeover, I supervise PhD and master students and coach several other researchers at KU Leuven.

Throughout my career, I contributed to several application fields including electric vehicle ecosystems (4 publications), fairness and service quality coverage (7 publications), vehicle routing (6 publications), scheduling and sequencing (4 publications), cutting, packing and loading (5 publications).

Senior Researcher

February 2019 - July 2022

KU Leuven, Ghent, Belgium

October 2017 - January 2019

LORIA, University of Lorraine, Nancy, France

January 2015 - September 2017

ULB, Brussels, Belgium

January 2014 - December 2014

HEC Montreal-CIRRELT, Montreal, Canada

Junior Researcher and Teaching Assistant

September 2006 - December 2013

Bilkent University, Ankara, Turkiye

Publications

This pages provides a classification of my publications with respect to application areas. Some publications fall into multiple categories and hence repeated. The full list can also be found on my Google Scholar, ORCID, Web of Science and Lirias pages.

Facility location and network design

Electric vehicle routing and charging station sizing

Çalık, Hatice, and Bernard Fortz. "A Benders decomposition method for locating stations in a one-way electric car sharing system under demand uncertainty." Transportation Research Part B: Methodological 125 (2019): 121-150.

Çalık, Hatice, Ammar Oulamara, Caroline Prodhon, and Said Salhi. "The electric location-routing problem with heterogeneous fleet: Formulation and Benders decomposition approach." Computers & Operations Research 131 (2021): 105251.

Çalık, Hatice, and Bernard Fortz. "Location of stations in a one-way electric car sharing system." In 2017 IEEE Symposium on Computers and Communications (ISCC), pp. 134-139. IEEE, 2017.

Çalık, Hatice, and Bernard Fortz. Demand forecasting models for one-way car sharing systems. Technical Report: Université 579 Libre de Bruxelles, Brussels, Belgium, 2017. 580 https://dipot. ulb. ac. be/dspace/bitstream/2013/277634/3/Demand Forecasting. pdf 581.

Fairness in service quality and coverage

Çalık, Hatice, Hakan Ergun, Kaan Yurtseven, and Dirk Van Hertem. "A bi-objective approach to power system restoration with renewable participation". PMAPS Auckland, New Zealand 2024.

Çalık, Hatice, and Barbaros C. Tansel. "Double bound method for solving the p-center location problem." Computers & operations research 40, no. 12 (2013): 2991-2999.

Çalık, Hatice, Sibel A. Alumur, Bahar Y. Kara, and Oya E. Karasan. "A tabu-search based heuristic for the hub covering problem over incomplete hub networks." Computers & Operations Research 36, no. 12 (2009): 3088-3096.

Çalık, Hatice, Martine Labbé, and Hande Yaman. "p-Center problems." Location science (2015): 79-92.

Çalık, Hatice, Markus Leitner, and Martin Luipersbeck. "A Benders decomposition based framework for solving cable trench problems." Computers & Operations Research 81 (2017): 128-140.

Zhu, Yi-Hang, Gilles Callebaut, Hatice Çalık, Liesbet Van der Perre, and François Rottenberg. "Energy Efficient Access Point Placement for Distributed Massive MIMO." Network 2, no. 2 (2022): 288-310.

Çalık, Hatice. "Exact solution methodologies for the p-center problem under single and multiple allocation strategies." PhD dissertation, Bilkent University (Türkiye), 2013.

De Walsche, Niels, Carlo Sulzbach Sartori, and Hatice Çalık. A radius-based approach for the bi-objective p-center and p-dispersion problem. In: 14th International Conference on Computational Logistics, (1-17). Presented at the ICCL, Berlin, 2023.

Coulier, Bryan, Hatice Çalık, and Greet Vanden Berghe (2024). " The constrained Bottleneck Spanning Tree Problem with upgrades." Discrete Applied Mathematics 353 (2024): 12-28.

Çalık, Hatice, Tony Wauters, and Greet Vanden Berghe. "The exam location problem: Mathematical formulations and variants". Computers & Operations Research 161 (2024).

Vehicle routing, sequencing and scheduling

Routing in distribution systems, passenger routing

Gandra, Vinícius Martins Santos, Hatice Çalık, Tony Wauters, Túlio AM Toffolo, Marco Antonio M. Carvalho, and Greet Vanden Berghe. "The impact of loading restrictions on the two-echelon location routing problem." Computers & Industrial Engineering 160 (2021): 107609.

Christiaens, Jan, Hatice Çalık, Tony Wauters, Reshma Chirayil Chandrasekharan, and Greet Vanden Berghe. "The prisoner transportation problem." European Journal of Operational Research 284, no. 3 (2020): 1058-1073.

Gandra, Vinícius SM, Hatice Çalık, Túlio AM Toffolo, Marco Antonio M. Carvalho, and Greet Vanden Berghe. "The vessel swap-body routing problem." European Journal of Operational Research 303, no. 1 (2022): 354-369.

Gandra, Vinícius, Carlo S. Sartori, Hatice Çalık, and Pieter Smet. "Multi-depot periodic vehicle routing with variable visit patterns." In Proceedings of the Genetic and Evolutionary Computation Conference Companion, pp. 2019-2026. 2022.

Çalık, Hatice, Jordi D'hondt, Marc Juwet, and Greet Vanden Berghe. "An integer programming formulation for the vehicle routing problem with cargo stability and multi-drop constraints." European Association of Research in Transportation (hEART) (2019).

Production scheduling, truck service scheduling, sequencing

Sartori, Carlo S., Vinícius Gandra, Hatice Çalık, and Pieter Smet. "Production scheduling with stock-and staff-related restrictions." In Computational Logistics: 12th International Conference, ICCL 2021, Enschede, The Netherlands, September 27–29, 2021, Proceedings 12, pp. 142-162. Springer International Publishing, 2021.

Van den Bossche, Thomas, Hatice Çalık, Evert-Jan Jacobs, Túlio AM Toffolo, and Greet Vanden Berghe. "Truck scheduling in tank terminals." EURO Journal on Transportation and Logistics 9, no. 1 (2020): 100001.

Çalık, Hatice, Pieter Smet, and Everton Fernandes da Silva. "Machine-personnel assignment with training and interim worker requirements." In Proceedings of the 13th International Conference on the Practice and Theory of Automated Timetabling (PATAT 2021), vol. 1, pp. 1-9. PATAT, 2020.

Çalık, Hatice, Aäron Hallaert, Farzaneh Karami, and Greet Vanden Berghe. "The video sequencing problem." MISTA 2019 (2019).

Cutting, packing and container loading

Two-dimensional container loading

Çalık, Hatice, Marc Juwet, Hande Yaman, and Greet Vanden Berghe. "Cargo securing under multi-drop and axle weight constraints." European Journal of Operational Research 307, no. 1 (2023): 157-176.

Gandra, Vinicius, Hatice Çalık, Tony Wauters, and Greet Vanden Berghe. "A heuristic approach to feasibility verification for truck loading." In Proceedings of the Genetic and Evolutionary Computation Conference Companion, pp. 1564-1569. 2021.

Angular and irregular cutting

Jonas Tollenaere, Hatice Çalık, and Tony Wauters. "Efficient use of collision detection for volume maximization problems". European Journal of Operational Research (2024).

Silva, Everton Fernandes, Hatice Çalık, Wim Vancroonenburg, Aline Aparecida Souza Leao, and Tony Wauters. "Extracting maximal objects from three-dimensional solid materials." Computers & Operations Research 132 (2021): 105290.

Projects

This page details a selection of the large-scale projects and short-term industrial collaborations that I contributed. I have been the co-promotor and supervisor of some of these projects. In others, I contributed as senior researcher. For confidentiality reasons, the identities of the industrial partners are not revealed.

Large-scale projects

Combinatorial bounds for heuristic neighbourhood search (KU Leuven Impulsfonds), 2021-2022

Investigated the effectiveness of combinatorial bounds into exact and heuristic algorithms. Developed mathematical models with high quality relaxation bounds as well as efficient algorithms for several location, routing, scheduling, cutting and packing problems. Computationally analyzed the systems under parametric changes and provided managerial insights. I published 11 peer-reviewed papers utilizing the bounding and filtering techniques, supervised 1 PhD student and collaborated with many researchers.

Optimizing the location of electric vehicle charging stations on the low-voltage network (VITO), 2022-2026

This is a PhD project which I have been supervising since November 2022. Prior to the official start of the project, I significantly contributed to the proposal writing. The project investigates strategies for location of EV charging stations by taking into account the low-voltage grid (LVG) stability. The approach is novel as the LVG restrictions were never considered when placing charging stations although excessive energy demand could cause undesirable impacts on the grid. My expertise in EV charging station location optimization has been a valuable asset in both setting up the goals and work plan as well as the succesful progress of the project so far. This project already led to a journal paper which is currently under review.

Optimization algorithms for vehicle routing problems with multiple decision levels (KU Leuven Internal Funds), 2019-2023

This is another PhD project which I supervised and has successfully completed in July 2023. In parallel to the combinatorial bounds project, we investigated the integration of aforementioned bounding and filtering methods into heuristics and metaheuristic frameworks to tackle optimization problems with multiple decision levels. These levels included two or more of location, routing, scheduling and loading decisions. In addition to supervision, I also contributed with mathematical models and conceptualization of methods and ideas. This project led to two journal and three conference papers.

Data driven optimization models for secure real-time operation of renewable dominated power systems (DISCRETE) (ETF ), 2023-2026

This is a joint project with University of Mons (Belgium). My focus in this project is on investigation of restoration strategies in power systems with renewable participation. The goal is to provide the power system operators with a set of rules for re-energizing the system after complete balckouts. Our first publication provided efficient models through a bi-objective optimization approach. Other challenges include integrated islanding and generator start-up sequencing.

Data-driven logistics - ORDinL (FWO - SBO), 2019-2021

ORDinL was a strategic basic research (SBO) project with academic partners from KU Leuven (CODeS and DTAI research groups), University of Hasselt (LOG research group), Vrije Universiteit Brussel (MOBI research center) as well as Flanders Institute for Logistics (VIL), as subcontracting partner to ensure the goals are aligned with industry needs. Throughout the project, close interaction with companies was maintained. Within this project, I developed efficient data-driven algorithms for several optimization problems. The solution methods largely benefited from the concepts investigated in the "Combiantorial Bounds" project.

EVERS – Electric vehicles routing and scheduling challenges within urban logistic (ANR), 2017-2019

EVERS was a multi-partner project addressing several strategic, tactical and operational challenges in EV ecosystems. Within this project, I had the opportunity to closely collaborate with researchers from LORIA, Université de technologie de Troyes (France) and University of Kent (the UK). Focused on urban distribution systems utilizing EVs, I developed a mathematical programming model and a Benders Decomposition framework for strategic, tactical and operational decision making. I introduced efficient lower and upper bounds and integrated them into the Benders framework to improve its convergence. My efforts in this project led to a peer-reviewed paper publicaiton in a highly recognized OR journal.

E4-share – Models for ecological, economical, efficient, electric car-sharing (Innoviris via JPI Urban Europe-Horizon 2020), 2015-2017

E4-share is a European project with partners from University of Vienna, Austrian Institute of Technology, University of Bologna, ULB and tbw research GesmbH (Austria). In this project, I investigated one-way car sharing systems under pre-booked and ad-hoc (uncertain) demand settings. In addition to effective mathematical programming models, I introduced efficient Benders Decomposition algorithms for determining station location and sizing as well as vehicle allocation decisions. Several enhancement techniques including stabilization and valid inequalities that I developed provided considerable performance improvements. My research work resulted in 2 peer-reviewed papers indexed in Web of Science Core Collection and two technical reports focusing on demand forecasting methods and heuristics for one-way electric car sharing systems.

Short-term industrial collaborations

Online simulation of an electric car sharing system under demand uncertainty

Our collaboration with a company in Flanders which provides car sharing service exclusively with electric cars was during the Spring 2022 semester. The company inroduced their system to my students in the Software Simulation course. After receiving a detailed historial data from the company, together with my students we analyzed and modeled the system. The students afterwards developed an online discrete-event system simulation and software visualization to analyze the system under multiple scenarios.

Customized algorithms for angular cutting of metal stocks.

Industrial manufacturing companies often require materials of irregular shapes to be cut with a non-zero angle. Maximizing yield and minimzing waste are main objectives when cutting such material parts. Prior to this project, no customized algorithms for angular cutting of stocks in batch were available. I developed a sequence-based mathematical programming formulation together with several enhancement techniques, valid inequalities and symmetry breaking constraints. My colleague developed an efficient heuristic algorithm which is able to solve large-scale problem in a matter of seconds. My formulation played a crucial role in the success of the algorithm which has been integrated in the software solution of the company which brought us this project. Thanks to the several enhancements to our model, we were able to evaluate and improve the performance of the heuristic considerably.

Machine-personnel assignment with training and interim worker requirements

In the production environment of a company from the Food Sector, machines can only be utilized under the supervision of trained employees. Preferably, employees rotate among different machines to gain multiple skills. However, they lose their skills if they do not work with a machine for a certain period. If a job cannot be performed by an employee on a certain day, this incurs costs. Therefore, this optimization problem requires minimizing the total cost while ensuring that the production requirements and training restrictions are satisfied. I developed a mathematical programming formulation for this problem together with several basic valid inequalities. In order to solve realistic problem instances, my colleague developed a heuristic algorithm and we published our work in a conference proceeding which can be accessed online.

Machine-personnel assignment with training and interim worker requirements

Production scheduling with stock- and staff-related restrictions

Multi-period service and route assignment for a distribution system

Multi-depot periodic vehicle routing with variable visit patterns

Teaching

I have been teaching bachelor and graduate (master and PhD) courses on a wide variety of Operations Research and Industrial Engineering subjects since 2006. As transfering my knowledge has always been a passion for me, I grabbed the opportunities to teach in four different instutions with different education systems. This page presents a list of the subjects I have taught together with brief details about the topics and course structures.

Lecturer

KU Leuven

Spring 2021, 2022, 2023

Software Simulation, Master in Industrial Sciences: Elektronica-ICT

Most real-world systems are prone to uncertainty. In this course, I teach how to simulate a stochastic system which consists of discrete events such as a new customer request or completion of a service. I usually invite an industrial collaborator to introduce an interesting case with historical data. Based on the historical data, the student determine the demand pattern in the form of a probability distribution. Afterwards, the students develop simulation software using Python to analyze the system under different scenarios, rules and restrictions. Additionally, they develop visualizations by using the Salabim package or any other library of their choice.

In 2022, I re-designed the course and since then I have delivered the lectures individually. The students obtained very satisfactory outputs and they also evaluated my teaching skills and the content of the course as very good.

Ecole des Mines de Nancy

Spring 2018

Advanced Discrete Optimization , Master in Industrial Engineering and Applied Mathematics

I designed this course by following the Integer Programming book of Laurence Wolsey from UCLouvain. The course starts by introducing basic modeling techniques for Integer Programs. It is possible to formulate a real-world problem in multiple ways, but not every formulation will make us happy. To increase the awareness about this fact, I taught the concept of 'good' and 'ideal' formulations. The course content evolved towards advanced concepts such as duality, relaxations and valid inequalities as well as more efficient techniques including branch-and-cut and dynamic programming.

I utilize my lecture notes for delivering Integer Programming lectures at KU Leuven as Guest Lecturer.

Guest Lecturer and contributor

KU Leuven

Fall 2019, 2020, 2021, 2022

Optimization Techniques, Master in Industrial Sciences: Elektronica-ICT

I regularly contribute to this course by delivering Integer Programming lectures. Each year student work on an industrial project. Depending on the optimization problem to tackle in the project, I update the content of my lecture notes for this course. My lectures have been received so well that I was invited to deliver several other topics in the faculty.

In 2019, 2020 and 2021, I also supervised the projects and contributed by developing mathematical programming models. These formulations were then published in international conference proceedings together with heuristics developed by my colleagues.

Spring 2019

Artificial Intelligence, Department of Computer Science, Campus De Nayer Sint-Katelijne-Waver

In this course, I supervised the master students during their project work focused on a car sharing project. The project was concerned with allocating cars to customer requests. Each allocation had certain cost and the goal was to minimize the total assignment cost while serving all requests.

Teaching Assistant

Université Libre de Bruxelles

Fall 2016

Combinatorial Optimization, Master in Computer Science

I introduced and supervised student projects.

2015-2016

Bachelor Projects, Department of Computer Science

I introduced, supervised and evaluated student projects.

Bilkent University

Spring 2010, 2011, 2012

Linear Programming, Graduate School of Engineering and Science, Industrial Engineering

This is a graduate level course focused on the theory and methods of linear programming such as polyhedral theory, simplex methods, duality theory, sensitivy analysis, decomposition, network flows and network simplex method. I contributed the course by preparing, organizing and evaluating the assignments, exams, problem solving sessions and parts of the lectures.

Fall 2011, 2012

Mathematical Analysis (Set Theory), Graduate School of Engineering and Science, Industrial Engineering

This is also a graduate level course focused on the set theory and proof techniques. The content of the course is essential in understanding the theoretical concepts especially for nonlinear optimization. I contributed the course by preparing, organizing and evaluating the assignments, exams, problem solving sessions and parts of the lectures.

Spring 2010

Nonlinear Programming, Bachelor in Industrial Engineering

This course aimed teaching senior bachelor students the theoretical and methodological concepts for nonlinear optimization. Lectures initially focus on the set theory and evolves towards Lagrangean duals and optimality conditions. I contributed the course by preparing, organizing and evaluating the assignments.

Fall 2006, 2007, 2008

Production Planning, Bachelor in Industrial Engineering

This is a fundamental course for the Industrial Engineering bachelors. The course initially focuses on forecasting and modeling techniques for the lot sizing problem. The students then learn the concept of economic order quantitiy under deterministic and stochastic settings.

In addition to typical teaching assistant duties, I also acted as the coordinator of the teaching assistants for this course in 2007 and 2008.

Fall 2010

Modeling and Methods in Optimization (Integer Programming), Bachelor in Industrial Engineering

This is the bachelor course where we taught modeling and algorithmic techniques for several well-know combinatorial optimization problems such as coloring problem and network flow problems. I contributed the course by preparing, organizing and evaluating the assignments.

Spring 2009

Manufacturing Processes, Bachelor in Industrial Engineering

This Industrial Engineering course focuses on manufacturing concepts and tools. The students learn how to control robots and basic manufacturing machines such as milling, turning and drilling in manual and automation labs. I coordinated the lectures and student projects in the automation lab with CNC machines.

Spring 2007

Distribution Logistics, Bachelor in Industrial Engineering

This course targets senior bachelor students and teaches fundamental combinatorial optimization problems in distribution logistics and well-known algorithmic techniques for solving them. I contributed the course by preparing, organizing and evaluating the assignments.

Service Activities and Engagements

In addition to my research and teaching acitivities, I have also contributed to the academic society through several service and engagement activities which I briefly summarized in this page.

Conference stream and workshop organizations

Conference stream and sessions

The “Location Analysis” stream for the EURO 2024 conference, Copenhagen, Denmark.

Scientific Committee member of EWGLA 2024 Meeting, Sheffield, UK.

A “Data Science meets Optimization” session for the EURO 2021 conference, Athens, Greece.

The “Data-driven decisions in OR” session for the ORBEL 2021 conference (online).

The “Staff Scheduling” session for the ORBEL 2021 conference (online).

The “Decomposition Methods” stream for IFORS conference in Seoul, South Korea, postponed (Original dates 21-26 June 2020).

Workshops

Quarterly workshop of Leuven Institute of Mobility (LIM), KU Leuven, Campus Rabot, 12 Jan. 2023.

The Workshop on Dynamic Stability Constraints, KU Leuven- Gent, Campus Rabot, 27-28 Nov. 2019.

Seminars

At LORIA and KU Leuven, I invited local and international OR experts and organized their talks. I also organized an online seminar series within the Impuls project.

Reviewing Activities for Journals and Conferences

List of the top OR journals for which I regularly review upon invitation (non-exhaustive)

European Journal of Operational Research

Computers and Operations Research

Transportation Research Part B

INFORMS Journal on Computing

Journal of Operational Research Society

Transportation Research Part E

Engagements

Board Member - EURO Working Group on Locational Analysis (EWGLA)

I am Coordination Board Member of EURO Working Group on Locational Analysis (EWGLA) since September 2022. In addition to support and coordination of the working group activities, I moderate the EWGLA list-server and maintain and update the website.

Member - International Staff Workgroup at KU Leuven-Gent, Campus Rabot

I have been a member of International Staff Workgroup at KU Leuven-Gent, Campus Rabot since 2019. The mission of the workgroup is to support the international staff through meetings and social activities.

Invited and Conference Talks

In addition to my research and teaching acitivities, I have also contributed to the academic society through several service and engagement activities which I briefly summarized in this page.

Invited talks

ELECTA, KU Leuven, Genk (Belgium), August 2023.
Title: Optimization of electric vehicle charging station locations on the low-voltage grid network.
Hosted by Dirk Van Hertem.

Universidad de Sevilla (Spain), November 2021.
Title: Electric Location-Routing Problem with Heterogeneous Fleet.
Hosted by Diego Ponce.

Polytechnic University of Valencia (Spain), February 2020.
Title: Scheduling trucks in a maritime tank terminal.
Hosted by Ruben Ruiz.

CODeS, KU Leuven, Ghent (Belgium), October 2018.
Title: A Benders decomposition method for locating stations in a one-way electric car sharing system under demand uncertainty.
Hosted by Greet Vanden Berghe

HEC - Ecole de gestion de l’Universite de Liege (Belgium), January 2016.
Title: Location, Allocation, and Routing Decisions in an Electric Car Sharing System.
Hosted by Yasemin Arda.

GERAD, Montreal (Canada), May 2014.
Title: Exact Solution Methodologies for the Capacitated p-Center Problem.
Hosted by Gilbert Laporte, GERAD and HEC Montreal.

Invited campus talks

NUMA, KU Leuven, 4 February 2021.
Title: The electric location-routing problem with heterogeneous fleets: Formulation and Benders decomposition.

NUMA, KU Leuven, 21 June 2019.
Title: Mathematical Programming Models with Decomposable Structure.

LORIA, University of Lorraine, Nancy (France), March 2018.
Title : A Benders decomposition method for locating stations in a one-way electric car sharing system under demand uncertainty.

Conference talks

Hatice Çalık, Dirk Van Hertem, and Hande Yaman. “New integer programming formulations for parallel power system restoration”. INFORMS, Seattle, USA, 2024.

Hatice Çalık, Hakan Ergun, Kaan Yurtseven, and Dirk Van Hertem . “A bi-objective approach to power system restoration with renewable participation”. International Conference on Probabilistic Methods Applied to Power Systems - PMAPS, Auckland, New Zealand, 2024.

Hatice Çalık, Tony Wauters, and Greet Vanden Berghe. “Exam Location and Room Selection”. EWGLA - EURO Working Group on Locational Analysis, Aveiro, Portugal, 2022.

Hatice Çalık and Tony Wauters. “Cutting trapezoids with rotations and angle-dependent loss”. ORBEL - Belgian OR Conference, Gent, Belgium, 2022.

Hatice Çalık, Marc Juwet, Hande Yaman, and Greet Vanden Berghe. “Secure Container Loading Under Axle Weight And Multi-Drop Restrictions: A Branch-And-Cut Framework”. YAEM - OR and Industrial Engineering Conference, Denizli, Türkiye, 2022.

Hatice Çalık, Pieter Smet, and Everton Fernandes Silva. “Staffing with training requirements”. ORBEL, online, 2021.

Van den Bossche, Thomas, Hatice Çalık, Evert-Jan Jacobs, Tulio A.M. Toffolo, and Greet Vanden Berghe. “Truck Scheduling in Tank Terminals”. ORBEL, Lille, France, 2020.

Hatice Çalık, Jordi D’hondt, Marc Juwet, and Greet Vanden Berghe. “An integer programming formulation for the vehicle routing problem with cargo stability and multi-drop constraints.” hEART Conference, Budapest, Hungary, 2019.

Hatice Çalık, Marc Juwet, and Greet Vanden Berghe. “Vehicle routing with cargo safety and multi-drop constraints”. EURO - European Conference on Operational Research, Dublin, Ireland, 2019.

Hatice Çalık, Marc Juwet, and Greet Vanden Berghe. “Vehicle routing with cargo safety and multi-drop constraints”. 23rd Belgian Mathematical Optimization Workshop, La Roche-en-Ardenne, Belgium, 2019.

Hatice Çalık and Ammar Oulamara. “A Benders decomposition approach for the electric locationrouting problem”. OR2018 - German OR Conference, Brussels, Belgium, 2018.

Hatice Çalık and Bernard Fortz. “A Benders decomposition approach for location of stations in an electric car sharing system”. OR2017, Berlin, Germany, 2017.

Hatice Çalık and Bernard Fortz. “Location of recharging stations under demand uncertainty in a one-way electric car sharing system”. ISOLDE - International Symposium on Locational Decisions, Toronto, Canada, 2017.

Hatice Çalık and Bernard Fortz. “A Benders decomposition approach for location of charging stations in an electric car sharing system with demand uncertainty”. IFORS, Quebec City, Canada, 2017.

Hatice Çalık and Bernard Fortz. “Location of Stations in a One-Way Electric Car Sharing System”. ISUT - International Workshop on Intelligent and Sustainable Urban Transportation, Heraklion, Crete, Grece, 2017.

Hatice Çalık, Markus Leitner, and Martin Luipersbeck. “A Benders decomposition based framework for solving cable trench problems”. 22nd COMEX Belgian Mathematical Optimization Workshop, La Roche-en-Ardenne, Belgium, 2017.

Çalık, Hatice, Markus Leitner, and Martin Luipersbeck. “A Benders decomposition based framework for solving cable trench problems”. INOC - International Network Optimization Conference, Lisbon, Portugal, 2017.

Hatice Çalık Hatice and Bernard Fortz. “A Benders decomposition approach for locating stations in a one-way electric car sharing system”. ORBEL, Brussels, Belgium, 2017.

Hatice Çalık and Bernard Fortz. “Location Of Stations In A One-way Electric Car Sharing System”. INFORMS Annual Meeting, Nashville, USA, 2016.

Hatice Çalık and Bernard Fortz. “Location of stations in a one-way electric car sharing system.” EWGLAXXIII - EURO Working Group on Locational Analysis, Malaga, Spain, 2016.

Hatice Çalık and Bernard Fortz. “Location and Routing Decisions in an Ad-hoc Electric Car Sharing System” EURO - 28th European Conference on Operational Research, Poznan, Poland, 2016.

Hatice Çalık and Bernard Fortz. “Location, Allocation, and Routing Decisions in an Electric Car Sharing System.” ORBEL, Louvain-la-Neuve, Belgium, 2016.

Hatice Çalık and Bernard Fortz. “Location, Allocation, and Routing Decisions in an Electric Car Sharing System.” COMEX Annual Workshop, Brussels, Belgium, 2015.

Hatice Çalık, Bahar Y. Kara, and Barbaros C. Tansel, “Mutlak p-Merkez Probleminin Büyük Ölçekli Serimlerde Kesin Çözümüne Yönelik Yeni Bir Algoritma (Solving the Absolute p-Center Location Problem on Large Networks).”, YAEM - National Conference of OR and IE, Ankara, Türkiye, 2015.

Hatice Çalık, Hatice and Bernard Fortz. “Location, allocation, and routing decisions in an electric car sharing system”. OR2015 - International Conference on Operations Research, Vienna, Austria, 2015.

Hatice Çalık, Bahar Y. Kara, and Barbaros C. Tansel,“Solving the Absolute p-Center Location Problem on Large Networks”, EWGLAXXII, Budapest, Hungary, 2015.

Hatice Çalık, Bahar Y. Kara, and Barbaros C. Tansel, “Solving the Absolute p-Center Location Problem on Large Networks”, ORBEL, Antwerp, Belgium, 2015.

Hatice Çalık, Oya Karaşan, and Barbaros Tansel, “Exact Solution Methodologies for the Capacitated p-Center Problem”, ISOLDE & EWGLA, Naples and Capri, Italy, 2014.

Hatice Çalık, Oya Karaşan, and Barbaros Tansel, “Exact Solution Methodologies for the Capacitated p-Center Problem”, Optimization Days, Montreal, Canada, 2014.

Hatice Çalık, Bahar Yetiş Kara, Oya Ekin Karaşan, and Barbaros Tansel, “New Formulations and Exact Algorithms for the Capacitated p-Center Problem”, INFORMS Annual Meeting, Minneapolis, USA, 2013.

Hatice Çalık, Bahar Yetiş Kara, Oya Ekin Karaşan, and Barbaros Tansel, “New Formulations and Exact Algorithms for the Capacitated p-Center Problem”, EURO-INFORMS, Rome, Italy, 2013.

Hatice Çalık, and Barbaros Tansel, “Double Bound Method for Solving the p-Center Location Problem”, International IIE Conference, Istanbul, Türkiye, 2013.

Hatice Çalık, and Barbaros Tansel, “Double Bound Method for Solving the p-Center Location Problem”, EWGLA XX, Ankara, Türkiye, 2013.

Hatice Çalık, Bahar Yetiş Kara, and Oya Ekin Karaşan, “Eksikli ADÜ Ağlarında Hava Yollarını Kullanan Kargo Sistemleri İçin Kaplama Problemi (Hub Covering Model for Cargo Delivery Systems That Use Airlines)”, YAEM, İzmir, Türkiye, 2007.

Contact

Location:

Kasteelpark Arenberg 10, 3001 Leuven, Belgium

E-mail:

hatice . calik [ a t ] kuleuven . be