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Sixth International Conference of the Tunisian Operational Research Society  

TORS'23

December 18-20, 2023 - Hammamet - TUNISIA

Scope and Objectives

|Scope and Objectives

The international conference of the Tunisian Operational Research Society (TORS) aims to share and exchange knowledge in the field of operational research and to promote collaborations and interactions between researchers and industrials. After last year’s success, the sixth edition of TORS conference will take place on December 18 - 20, 2023 in Hammamet, Tunisia. It covers research issues in the operational research and decision aid fields involving recent theoretical developments and real applications.

The scope of TORS'23 includes:

  • Theoretical developments, recent developments in linear, nonlinear, integer, stochastic, multilevel and multi-objective optimization.

  • Business Analytics.

  • Simulation, Learning and Statistical methods.

  • Information Systems, Decision theory, Game theory and Multi-Criteria Decision Aid.

  • Constraint Programming and Artificial Intelligence.

  • Heuristics and Meta-Heuristics.

  • DEA and Performance Measures.

  • Risk Management and Resilience.

  • Management Quality and Integrated Management Systems.

  • Healthcare Logistics and Supply Chain.

  • Sustainable and Resilient Supply Chain.

  • Uncertainty theories, Belief Functions, Probability, Possibility and Fuzzy Sets theories.

  • Some Applications of OR such as: Planning and Scheduling, Logistic and Routing problems, Timetabling, Cutting problem, Knapsack problem, Portfolio Optimization, Set Covering / Clustering / Packing, Reliability and Maintenance, Data Mining, Health and Environment and Bioinformatics, Supply Chain Management, Industry 4.0, Sustainable Renewable Energy, Circular Economy and Sustainability.

  • Economic Intelligence and Firm Performance.

  • All topics related to OR are welcome. 

|Keynote Speakers

Our speakers come from Europe and Canada to share their knowledge at the TORS'23 Conference. You can read their biography below and learn more about them, and what they will tell you about during their talks.
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Walid Klibi

Kedge Business School France

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Jacques Teghem

University of Mons

Belgium

Fatma Gzara.jpeg
Fatma Gzara

Walerloo University Canada

Anissa Frini.jpeg
Anissa Frini 

Université du Québec

Canada

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Oualid Jouini

Centrale Supélec

France

Keynote Speakers
Important Dates

|Important Dates

July 10, 2023

Submission of Short Papers

September 30, 2023

Extended Deadline of Submission of Short Papers

October 15, 2023

Acceptance Notification

Note: Early notification can be sent to authors under request, within 15 days from submission, for visa or administrative formalities.

November 01, 2023

Final Version Due

November 20, 2023

Early Registration

Submission Details

|Submission Details

All submitted short papers of 4 - 5 pages should be written in English. They should clearly include: title, brief abstract, list of key-words, author(s) full name(s), affiliation(s), complete address(es), and e-mail address(es). Please state the name of the contact person. Papers must be submitted electronically using the online submission system according this template.

SPECIAL SESSION 1 - “Metaheuristics, Heuristics and Optimization techniques for Green Vehicle Routing Problem (MHO-GVRP)”. Session Co-Chairs: Dr. DalilaTAYACHI. More Details.

SPECIAL SESSION 2 - “Applications of Mathematical Programming and Computing in Decision-making". Session Chair: Dr. Umar Muhammad Modibbo. More Details.

Publication

|Publication

A selection of extended-papers will be considered for publication in special issues.

Registration Instructions

|Registration Instructions

Conference Fees
  • Registration fees include participation and accommodation Hotel (2-nights stay “December 18 - 20, 2023” in double occupancy rooms, All Inclusive Soft), admission to scientific sessions, all conference materials, coffee breaks, certificate of attendance.

  • Registration fees do not include the fees for the social program.  

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For Tunisian Residents:

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1-  Tunisian participants may pay the registration fees by order form (bon de commande).

      The Tax Registration Number (matricule fiscale) of TORS is 1403146/Q.

2-   A document confirming your student position must be sent by email to: torsasso@gmail.com   

3-   The organization committee will be pleased to send an invitation letter to registered participants under request.

       For any help regarding the registration, please contact us by email: torsasso@gmail.com

4-   Additional fees should be paid for the accompanying persons (adults and children) and if the participant chooses to stay in a single        room (see the registration form).

5-   Additional fees should be paid for the extra nights.

Methods of Payment

All payments should be made by order form (for Tunisian participants), cash or by bank transfer to the following Bank Account: 

-    Account Name: ASSOCIATION T.O.R.S

-    Bank Name: Banque Zitouna

-    Bank Address: Route Gremda 2,5km - 3022 Sfax

-    RIB: 25022000000029034026

-    International Bank Account Number ‘IBAN’: TN59 2502 2000 0000 2903 4026

-    Bank Identification Code (BIC):BZITTNTT

Please clearly indicate YOUR NAME, and the announcement: “TORS 2023″. Please take into account that most banks apply costs for international transfers. These costs should be paid by the registrant.The payment justification must be sent by email to: torsasso@gmail.com  

REGISTRATION (Will be Opening Soon)

|Committees

Committees

Honorary Conference Chair

Jacques Teghem

Conference Chairs

Taicir Moalla Loukil
Mohamed Ayman Boujelben

Publication Chair

Talel Laadhari 

Organizing Committee Chair

Hela Frikha

Scientific Committee Chair

Ahmed Frikha

Scientific Committee Co-Chair

Sonia Rebai

Public Relation Chair

Diala Dhouib

Public Relation Co-Chair

Achraf Ammar

Web Master & Submission Manager

Mariem Masmoudi

Organizing Committee

Achraf Ammar
Aida Kharrat
Bassem Chaker
Bilel Ammar

Emna Marrekchi
Fatma Ben Yahia
Ines Kanoun
Mariem Masmoudi
Mohamed Ali Elleuch
Safa Bhar Layeb
Sameh Chtourou

Wiem Daoud

Scientific Committee

Abdelaziz Dammak (TN),

Abdeljalil Farhat(TN),

Abdelkarim Elloumi (TN),

Abdewaheb Rebai (TN),

Abderrahmen Elmhamedi (FR),

Adnen Elamraoui (FR),

Ahmed Frikha (TN),

Ahmed Ghorbel (TN),

Ali Ridha Mahjoub (FR),

Anis Ben Ishak (TN),

Anis Chelbi (TN),

Anis Gharbi (KSA),

Anissa Frini (CA),

Canstantin Zoupunidis (GR),

Dalila Tayachi (TN)

Dave Evans (SA),

Diala Dhouib (TN),

El-ghazali Talbi, (FR),

Faouzi Masmoudi (TN), 

Farhat Abdeljalil (TN),

Fatma Gzara (CA),

Fouad Jawab (MA),

François Delmotte (FR),

Habib Chabchoub  (UAE),

Hatem Hadda (TN),

Hatem Masri (BHR),

Hedi Nabli (TN),

Hedi Essid (TN),

Hela Frikha (TN),

Henri Pierreval (FR),

Hichem Hassin (TN),

Hichem Kamoun (TN),

Houda Derbel (TN),

Imed Kacem (FR),

Issam Ksentini (TN)

Jacques Teghem (BE),

Jamal Chaabane (DZ),

Jaouad Boukachour (FR),

José Rui Figueira (PT),

Jouhaina Siala (TN),

Khaled Ghedira (TN),

Khaled Jabeur (TN),

Lotfi Belkacem (TN),

Luis Martinez (ES),

Mahdi Khemakhem (KSA),

Mahdi Mrad (KSA),

Marie Ange Manier (FR),

Modibbo Umar (NG),

Mohamed Amine Chergui (DZ),

Mohamed Ayman Boujelben (TN),

Mohamed Haouari (QR),

Mohamed Naceur Azaiez (TN),

Moncef Abbas (DZ),

Mounir Benaissa (TN),

Mustapha Moulay(DZ),

Najeh Ben Guedria (TN)

Nesrine Halouani (TN),

Omar Benayed (TN),

Oualid Jouni (FR),

Rafaa Mraihi (TN),

Raoudha Kammoun (TN),

Rosa Rodriguez (ES), 

Sabeur Elkossentini (TN),

Safa Bhar Layeb (TN),

Said Hanafi, (FR),

Said Algattofi (TN),

Samir Elhedhli  (CA),

Saoussen Krichen (TN),

Sarah Ben Amor (CA)

Slim Benyoussef (TN),

Sonda Elloumi (KSA),

Sondes Hammami (TN),

Sonia Rebai (TN),

Souhail Dhouib (TN),

Soulef Smaoui (TN),

Sue Merchant (EN),

Tadeusz Trzaskalik (PL),

Taicir Moalla Loukil (TN),

Talel Laadheri (TN),

Tomasz Wachowicz (PL),

Walid Klibi (FR),

Yasmina Heni (FR),

Younes Boujelbene (TN),

Ziad Babai (FR)

Ziad Jemai (TN),

Committees
Venue

|Venue

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How to reach Tunisia

The major airports in Tunisia are:

  • Tunis – Carthage International Airport (TUN)

  • Enfidha Hammamet International Airport (NBE)

  • Monastir Habib Bourguiba International Airport (MIE)

About Hammamet

A city in the northeast of Tunisia, Hammamet is bordered by the Mediterranean Sea. The city covers an area of 36 square kilometers at a low altitude. Tunis, the capital, is located 60 kilometers to the northwest.

Tunisia’s coastline is characterised by white sandy beaches and turquoise sea, making it an increasingly popular destination for discerning tourists. One of the most fashionable places on the coast is undoubtedly Hammamet, whose name derives from hammam, the thermal bath. The waters that flow from its springs have therapeutic and regenerating properties, which not only confer well-being to the body but also serenity to the spirit.

The city of Hammamet, however, offers a great deal more than just physical and mental well-being. It has a coastline where all kinds of water sports can be enjoyed, and a cuisine among the most tasty and sophisticated of the country.

Hammamet has inspired numerous artists for its spectacular landscapes. The blue of the sea blends into the green of its golf courses, while the multi-coloured flowers in the gardens contrast with the white houses. A very lively and elegant city, it is also popular with international tourists. The painter Paul Klee, for example, after visiting Hammamet, declared that he felt completely at home in this colorful city and used the warm and bright tones found in the area in many of his paintings.

The charm of Hammamet is also due to its wonderful Medina, the old town, which, according to experts, is the most spectacular of all those in Tunisia. An imposing fort, known as the Kasbah in Arabic, is found in a corner of the old town.

One of the main attractions of Hammamet is, however, the modern Dar Sebastian International Cultural Centre, built in 1920 by a millionaire Romanian businessman, George Sebastian. The villa cleverly combines Art Deco with elements of local architecture, and when the architect Frank Lloyd Wright entered the villa for the first time, he was amazed by the luxury and elegance. Inside it houses a large open-air theatre that holds concerts in the summer months.  

Hammamet is mainly famous for its Marina Yasmine Hammamet which makes it one of the favorite destinations for tourists during the summer. But limiting Hammamet to this hotel complex, as luxurious and beautiful as it is, would be a shame. Because this city is rich in a fascinating history that began in Roman times, and its characteristic beauty has led many personalities of all kinds, artists as tyrants, to stay there.

It was perhaps during Roman times that the city had its greatest influence on the regional chessboard.

From this time, the number of conquests of the city by different civilizations is impressive. Attracted by its beauty and wealth, Arabs, Normans, Catalans, Ottomans, Spaniards and many others. All these civilizations can be found in the architecture of the city, from the Great Mosque built in 3 stages, the ramparts, the upper Medina to the Catholic church.

The superb complex of Yasmine Hammamet attracts the most visitors each year. This seaside resort offers many fine sandy beaches, a splendid seaside promenade, luxurious hotels and residences, a Marina that can accommodate more than 700 boats, the reproduction of a typical medina with its souk and even a theme park.

Tourism Offices

In each major city (Tunis, Sousse, Nabeul, Hammamet, Tozeur, etc) you will find an ONTT (National Tunisia Tourism Office) branch office. These offices are open during regular working hours, as well as Saturdays and Sundays. They can help you with any information you need, excluding tour and excursion information.

Voltage

- 230 V and 50 Hz

- Electrical plugs type C and E (same round plugs like in Western Europe.)

- Make sure to bring a converter for your hair-dryer and other powerful electronics.

Time Zone

Tunisia is at UTC/GMT +1. Check time and date.com for further information about time zones.

Biography & Abstract

|Biography & Abstract

Walid Klibi
Jacques Teghem
Fatma Gzara

Prof. Walid Klibi

Fostering Robustness in Supply Chain Design : 

A unifying framework for future opportunities

The Center of Excellence in Supply Chain (CESIT), Kedge Business School, France.

MIT Center for Transportation and Logistics – MIT CTL, USA.

Biography:

Walid Klibi is Professor of Supply Chain Management and Analytics at Kedge Business School (France), and member of its Center of Excellence in Supply Chain (CESIT), since 2011. He obtained his Ph.D. in Business Administration at Laval University’s Business School in Canada, in 2009. He holds since 2020 a habilitation degree in Applied Mathematics at University of Bordeaux in France.

His research interests relate primarily to Supply Chain design, resilience and robustness, distribution in omnichannel retailing, and hyperconnected urban logistics, with a focus on stochastic modeling and optimization. Most of his research work is carried out in partnership with international companies such as: Sephora, ID Logistics, Groupe La Poste, Groupe OCP, South Shore Furniture, Johnson & Johnson, Airbus Atlantic, Sanofi.

He is co-author of several international scientific and professional articles, and of an “award winner” book in the field of Supply Chain, entitled “The Design of Value Creating Supply Chain Networks”. He is currently appointed as a research affiliate at the MIT Center for Transportation and Logistics (USA), an affiliated faculty of the Supply Chain & Logistics Institute – Physical Internet Center - Georgia Tech (USA) and collaborating member of the Interuniversity Research Center on Business Networks, Logistics and Transport (CIRRELT) in Canada.

Supply chain design (SCD) problems deal with strategic decisions on the reengineering of the network structure, in terms of deployment of long-term resources and the planning of the role of those resources' and their mission in terms of capacities to assign and policy-making for the primary supply chain (SC) activities. Such strategic investments in resources, policy making and deployment issues are the responsibility of top management and at a core of corporate strategy.

From an operations research perspective, the design of SC networks is one of the most important areas of application for multi-commodity network design models. Despite the abundant literature in this area, extant approaches fail to comprehensively capture the reality of modern SC systems.

In this paper, based on our review of literature in the field, unifying SCD and SC network design models, we identify critical challenges and main opportunities for future research in this area. These are articulated around three axes, with the aim to improve the ability of SCD models to drive business decisions: (1) expanding of the scope of SCD models, (2) enhancing methodologically the accuracy of SCD models and (3) improving solution methods and decision-making approaches. In each of these axes, we review the current state of the art of the literature, and we confront this to the requirements of the modern supply chain systems. We identify main gaps in the extant literature, provide guidelines on key modeling-solvability tradeoffs and identify concrete opportunities for future research fostering the robustness of SC designs.

Prof. Jacques Teghem

A bi-objective approach to reschedule new jobs in an one machine scheduling model

Jacques Teghem and Daniel Tuyttens

Polytechnic Faculty (UMONS), Belgium

Biography:

Dr. en sciences mathématiques de l’Université Libre de Bruxelles (ULB). Professeur émérite de la Faculté Polytechnique (UMONS) ; Professeur (partim) honoraire de l’ULB. Président de la société belge de Recherche Opérationnelle de 1983 à 1985. Editeur de la revue « European Journal of Operational Research » (EJOR) de 1999 à 2007.

Domaines de recherche : contrôle des systèmes d’attente ; optimisation combinatoire ; métaheuristiques ; optimisation multi-objectifs ; gestion de production. Auteur des deux tomes du livre « Recherche Opérationnelle » (Editions Ellipses). Tome 1 : méthodes d’optimisation (634 pages) ; tome 2 : gestion de production ; modèles aléatoires ; aide multicritère (634 pages).

Coordonnateur de projets belges de coopération universitaire au développement avec la Faculté des Sciences Economiques et de Gestion de l’Université de Sfax de 2002 à 2014.

We consider an one machine scheduling model, minimizing a classical objective function – either the total completion time or the maximum tardiness – and with two sets of jobs : one with initial jobs already scheduled and one with new jobs which must be inserted in the schedule. As such reschedule can create a modification of the schedule of the initial jobs, a disruption objective is considered in addition to the original objective. This additional objective can be formulated in four different ways. Such model has been introduced by Hall and Potts, minimizing either a linear aggregation of the two objectives or the initial objective under a constraint giving an upper limit of the disruption objective. In this study, the aim is to obtain the set of efficient schedules in regard of the two objectives. Algorithms are provided for the eight possible bi-objective problems and illustrated by some didactic examples.

Prof. Fatma Gzara

Analytics for smart city logistics

Faculty of Engineering

University of Waterloo, Canada

Biography:

Fatma Gzara is Professor at the Department of Management Sciences and co-founder and co-director of WANOPT, the Waterloo Analytics and Optimization Lab. Her primary research interests are in supply chain analytics, smart city logistics, and large scale optimization.  Her current research focusses on optimizing supply chain operations using data driven approaches, the analysis of emerging technologies in logistics and distribution like crowdsourced and drone delivery, and the optimization of systems operating in uncertain environments. Recently, she led several industry collaborations on data analytics and optimization funded by NSERC, OCE, and MITACS and industry collaborators Bombardier Inc., Unilever, Navblue Inc., AirMatrix, and Dematic Ltd. Her work appeared in Transportation Science, Informs Journal on Optimization, Journal of Global Optimization, Omega, Networks, Computers and OR, EJOR, and IISE Transactions, among others.

In this talk, we will discuss critical challenges in sustainable and responsive city logistics and last mile delivery. We will cover research progress on the adoption of emerging transportation technology such as drones, electrical vehicles, and crowdsourcing, and on novel data-driven optimization approaches to address the uncertainty prevalent due to technology and operating environments.

Prof. Anissa Frini

Temporal MCDA methods for sustainable decisions under uncertainty

Université du Québec à Rimouski, Canada

Biography: 

Dr. Anissa Frini is professor in operations management in the department of management science of Université du Québec à Rimouski. She holds a Ph.D in operations and decision support systems in 2006 from Laval University, a MBA in Information Systems in 1999 from Laval University; and an engineering degree in 1997 from École Polytechnique de Tunisie. She has expertise with multiple criteria decision aid, dynamic decisions, temporal MCDA, uncertainty modelling, and risk management. She has developed temporal multi-criteria decision-making methods in a context of uncertainty both for ranking and sorting problems, that were applied for sustainable forest management. She is also working on climate change related risk management and on supply chain resilience. Her research was funded by Fonds de recherche du Quebec and Social science and humanities research council of Canada and applied in different contexts such as sustainable development, climate change, healthcare, flood risk management, sustainable forest management and corporate sustainability. Results of her research have benefit to different ministries and agencies of Quebec government as The Ministry of Environment and Fight Against Climate Change, The Chief Forester Office of Quebec and OURANOS.

Sustainable decision-making problems are complex in a context where decisions have to be made based concurrently on economic, social and environmental considerations and to be evaluated on the short, medium and long term. In the last five years, development of temporal MCDA has witnessed the interest of some researchers. However, the latest developments remain limited and only a few research studies offer aggregation frameworks for temporal evaluations settings. This tutorial presents recent temporal MCDA methods that we proposed to recommend sustainable decisions. Three MCDA methods will be presented. First, the outranking MUPOM method will demonstrate how outranking MCDA methods, based on concordance-discordance principles, can be generalized to processing temporal impacts of decisions. Secondly, the PROMETHEE-MP method which consists of a multi-period generalization of PROMETHEE under random uncertainty is discussed. Thirdly, we present a temporal sorting MCDA method under stochastic uncertainty, called TSMAA-Tri. This proposed method consists of sorting the alternatives into predefined categories based on a generalization of SMAA-Tri to a temporal context (multi-period evaluation of alternatives) where alternative evaluations are stochastic. The proposed methods are illustrated for sustainable forest management to show their applicability.

Keywords: Multiple criteria decision aid (MCDA); Temporal evaluations; Outranking methods; Sorting methods, Sustainable decisions; Uncertainty.

Prof. Oualid Jouini

Stochastic models for the optimization of modern call centers

CentraleSupélec, University of Paris-Sacaly, France

Biography:

Oualid Jouini is a full professor at the Department of Industrial Engineering (LGI) at the engineering school CentraleSupélec, University of Paris-Sacaly in France. He is the head of the Operations Management research group at LGI. He is the director of the doctoral program on artificial intelligence at University of Paris-Saclay. He is also the director of the curriculum Engineering of Complex Systems with 12 master programs at the University of Paris-Saclay. He held the research chair Call Centers at CentraleSupélec from 2015 to 2020.

His research interests are in operations management and operations research for services with main applications to call centers, healthcare systems and air traffic flow management. The main purpose of his research is to develop insights and recommendations for managers in order to make their systems more efficient and more reactive. He employs quantitative methods based on stochastic models. He won several awards, including the IBM Faculty Award for a healthcare project on streamlining the pathway of severe trauma care. He held public and private research grants with several millions of euro (ANR Jeunes Chercheurs, DIGITEO, ARS, QNRF, Interactiv, Bluelink services, General Electric Healthcare, …). He is also Associate Editor in several international journals, including the INFORMS journal Service Science.

Call centers are complex service systems with labor-intensive operations. They employ millions of agents across the globe and serve as a primary customer-facing channel for firms in many different industries. New technology-driven innovations in call centers are multiplying the opportunities to make more efficient use of agents as they can handle different types of workflow, including inbound calls, outbound calls, emails, web calls, chats and social medias. However, several issues on the management of call center operations emerged also as a result of advanced technology. Managers in practice are particularly interested in how to efficiently share the agent time between the available job types in order to improve the call center performance, i.e., efficient routing mechanisms of multiple flows from multiple channels to the capacity.

 

We discuss various optimization problems for modern call centers with human-human channels. We illustrate how stochastic models, such as queueing and Markov chain techniques, can help in generating solutions and insights for the settings of delay announcement, chat online assistance, and advertising during waiting. This contributes to bridge the gap between the scientific literature on stochastic modeling and the needs of call center managers in real-life.

Anissa Frini
Oualid Jouini

|Social Program

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|Contact

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