DEFENDED THESES IN 2017


 

Samedi HENG, UCLouvain, LouRIM/CEMIS

 

Impact of Unified User-Story-Based Modeling on Agile Methods: Aspects on Requirements, Design and Life Cycle Management

SUPERVISORS:

Manuel KOLP, UCLouvain

Yves WAUTELET, KULeuven

JURY :

Jean VANDERDONCKT, UCLouvain

Isabelle MIRBEL, Université Nice Sophia Antipolis

Vincent ENGLEBERT, UNamur

CHAIRMAN :

Per AGRELL, UCLouvain

https://cdn.uclouvain.be/groups/cms-editors-LouRIM/Samedi_HENG_Annonce_soutenance_publique_.pdf

ABSTRACT:

User stories (US) are the most used requirements artifacts within agile methods such as XP and Scrum. They are written in natural language using prose or following a specific template. In practice, many templates have been proposed with no semantic for each syntax used in these templates. Therefore, this thesis has studied US templates with the following structure: As [WHO], I want [WHAT], so that [WHY]. We have proposed a unified model for US templates and provided semantic of each syntax. We have also proposed a goal-based model called Rationale Tree (RT) aiming at analyzing US sets. It allows identifying dependencies between US, Epic US and Themes. In addition, the RT provides a global view of the systems which allows to improve the planning activities, and therefore the development life-cycle of agile methods. As an alternative to RT, we have also proposed a US model based on the Use-Case model that allows US to be used within non-agile projects and fill the gaps between US and Object-Oriented design.

 

Mehdi MADANI, UCLouvain, IMMAQ/CORE

 

Revisiting European day-ahead electricity market auctions: MIP models and Algorithms.

SUPERVISOR(s):

Mathieu VAN VYVE, UCLouvain

JURY:

François GLINEUR, UCLouvain

Anthony PAPAVASILIOU, UCLouvain

Carlos RUIZ, Universidad Carlos III de Madrid

Bertrand CORNELUSSE, Université de Liège

CHAIRMAN:

Per AGRELL, UCLouvain

https://cdn.uclouvain.be/groups/cms-editors-LouRIM/affiches-theses/Madani%20Mehdi_Annonce_soutenance%20publique_.pdf

ABSTRACT:

In Europe, orders are submitted to power exchanges to sell or buy substantially large amounts of electricity for the next day. The orders include so-called non-convexities rendering the underlying microeconomic optimization problem `non-convex’, departing from more classical assumptions in microeconomic theory. Most of the power exchanges are integrated at a European level under the Price Coupling of Region project. Uniform prices are computed, in the sense that every market participant of a same market segment (location and hour of the day) will pay or receive the same electricity price and no other transfers or payments are considered. This is done at the expense of having some bids “paradoxically rejected” in the market outcome, as for the computed market prices, some bids propose a price which is “good enough” but are yet rejected. It is also at the expense of welfare optimality, as most of the time, no welfare optimal solution can be supported by uniform prices such that no financial losses are incurred. The present thesis proposes mixed integer programming models and algorithms for such non-convex uniform price auctions. In particular, a new bidding product is proposed which generalizes both block orders used in the Central Western Europe Region (France, Germany, Belgium, the Netherlands, etc) or Nord Pool (coupling Northern countries), and, mutatis mutandis, complex orders with a minimum income condition as used in Spain and Portugal. 

 

Mathieu ZEN, UCLouvain, LouRIM/PRISME

 

A Methodology for Assessing Aesthetics of a Graphical User Interface of an Information System. Visual Measures-based Automated Evaluation.

SUPERVISOR(s):

Jean VANDERDONCKT, UCLouvain

JURY:

Francisco MONTERO, Universidad De Castilla-LaMancha

Ahmed Seffah LAPPEENRANTA, University of Technology

Suzanne KIEFFER, UX Strategist / VUB / UCLouvain

CHAIRMAN:

Per AGRELL, UCLouvain

https://cdn.uclouvain.be/groups/cms-editors-LouRIM/affiches-theses/Zen%20Mathieu_Annonce_soutenance%20publique_.pdf

ABSTRACT:

The Graphical User Interface (GUI) is probably the most frequently used interaction modality of all interactive systems. While the information contents of these GUIs are of high importance, their presentation is recognized as an essential factor that determines the GUI quality that is impacted by several determinants such as, but not limited to: visual design, aesthetics, pleasurability, arousal, and fun. Consequently, assessing the aesthetic quality of a GUI becomes a potential element to focus on in order to facilitate communication between the end user and her information system. “How to assess user interface aesthetics?” remains a question faced by several researchers and designers during the user interface development life cycle since aesthetics has been demonstrated to positively influence usability, user experience, pleasureability, and trust. Visual techniques borrowed from visual design suggest that the GUI layout could be assessed against a set of visual measures such as balance, symmetry, alignment, and simplicity, to name a few. For each visual technique, a visual measure could be computed based on a mathematical formula that captures the basic elements for each technique. Whereas different formulas exist for computing each visual measure, no consensus exists today on how to consistently evaluate these measures in a way that is aligned with human judgment, which is intrinsically subjective. In order to appropriately assess the aesthetic quality of a GUI of an information system, there is a need to align the machine objectivity based on computerized visual measures to the human subjectivity based on human perception.” 

 

Stéphanie COSTER, UCLouvain, LouRIM/CRECIS

 

La « fabrique » de l’intégration professionnelle : entre contraintes institutionnelles et dynamiques organisationnelles

SUPERVISOR(s):

Evelyne LEONARD, UCLouvain

JURY:

Donatienne DESMETTE, UCLouvain

François PICHAULT, Université de Liège

Anne DIETRICH, IAE Lille I

CHAIRMAN:

Nathalie DELOBBE, UCLouvain

https://cdn.uclouvain.be/groups/cms-editors-LouRIM/affiches-theses/Coster%20St%C3%A9phanie_Annonce_soutenance%20publique_.pdf

ABSTRACT:

La thèse examine l’influence des contraintes institutionnelles et des dynamiques organisationnelles au sein de la « fabrique » de l’intégration professionnelle.  Dans le but de comprendre l’intrication entre les différents processus en jeu, cette recherche fait dialoguer les théories néo-institutionnelles et la théorie de la régulation sociale, mettant en avant les pressions institutionnelles cadrant les organisations et les choix managériaux, mais également les réactions des acteurs de l’organisation – gestionnaires et travailleurs – par rapport aux règles imposées. Au travers d’une enquête quantitative, d’une analyse documentaire et d’études de cas, cette thèse de doctorat démontre que l’intégration professionnelle est influencée par les contraintes institutionnelles et les processus organisationnels, mais dans une certaine mesure seulement. C’est finalement le jeu des acteurs en présence qui façonne l’intégration professionnelle. 

 

Thi Thy Thao LE,UCLouvain, IACCHOS/CRIDIS

 

La formation professionnelle continue face au défi de la justice dans les organisations – Le cas des entreprises et universités vietnamiennes.

SUPERVISOR(s):

Matthieu de NANTEUIL, UCLouvain

JURY:

Evelyne LEONARD, UCLouvain

Hervé POURTOIS, UCLouvain

Philippe DEBROUX, University of Soka

Sandrine FERNEZ-WALCH, Université Toulouse 1 Capitole

CHAIRMAN:

Per AGRELL, UCLouvain

https://cdn.uclouvain.be/groups/cms-editors-LouRIM/L%C3%AA%20-%20Annonce_soutenance%20publique_Thi%20Thu%20Thao%20L%C3%AA_0.pdf

ABSTRACT:

Face au problème universel de l’inégalité d’accès des salariés actifs à la FPC, nous nous interrogeons sur les logiques d’action des acteurs. Les enjeux de justice en la matière se trouvent non seulement sur une proportion importante d’inégalité d’accès, mais la liberté d’action, la question du choix et les relations au travail constituent autant de questions qui touchent aux sphères de justice. Dans cette thèse, nous avons examiné les principes de justification qui ont légitimé l’engagement des acteurs dans cette pratique. Nous nous sommes intéressés également aux mécanismes institutionnels, socioéconomiques et culturels susceptibles d’influencer ces justifications. En partant d’une approche constructiviste et centrée sur les acteurs, nous avons étudié le sens de la justice en matière de FPC des salariés vietnamiens des secteurs manufacturier et universitaire. Les résultats de notre recherche montrent que l’inégalité d’accès en soi, ne constitue pas forcément un problème de justice en matière de FPC. Cette inégalité dissimule la pluralité des critères de justice des personnes concernées. 

 

Thanh-Diane NGUYEN ,UCLouvain, LouRIM/PRISME

 

A cross-device pattern-based approach for designing multiple user interfaces to information systems.

SUPERVISOR(s):

Jean VANDERDONCKT, UCLouvain

JURY:

Oscar PASTOR, Universidad Politécnica de Valencia, Espagne

Ahmed SEFFAH LAPPEENRANTA, University of Technology, Finland

Suzanne KIEFFER, UX Strategist / VUB / UCLouvain

Tran Thi Ai Vi, ULB

CHAIRMAN:

Per AGRELL, UCLouvain

https://cdn.uclouvain.be/groups/cms-editors-LouRIM/Nguyen_Thanh-Diane%20Annonce_soutenance%20publique_%20(1).pdf

ABSTRACT:

Based on a comparative analysis of different user interface pattern catalogues, languages, and on the requirements elicited from it, this thesis defines a cross-device pattern as a pattern expecting to capture a general solution to a problem of designing multiple user interfaces of information systems for multiple contexts of use, particularly devices and platforms.A conceptual model of cross-device pattern is defined with its semantics expressed as a UML 2.0 class diagram and its syntax via User Interface Pattern Language Markup Language (UIPLML), a XML-compliant markup language for designing Multiple User Interfaces (MUIs) patterns for multiple contexts of use. To validate UIPLML, four pattern databases offering multi-faceted search have been created. A step-wise method for applying cross-device pattern is defined and applied on a running case study. Three frequently used design patterns, i.e., the Master-and-Details design pattern, the Population Interaction Unit and the Service Interaction Unit of the OO-Method, are then subject to a methodological instantiation. Various software prototypes (i.e., UsiMAD, PaDeRa) have been developed in order to investigate the impact of the method on designers who are responsible for designing multiple user interfaces based on cross-device patterns. 

 

Saifeddine BEN HADJ, UCLouvain, IMMAQ/LFIN

 

Essays on Risk Management and Financial Stability

SUPERVISOR(s):

Isabelle PLATTEN, UCLouvain

Roland GILLET, Paris 1

JURY:

Jean-Paul LAURENT, Paris 1

Mikael PETITJEAN, UCLouvain

Frédéric LOBEZ, Lille 2

Hans DEWACHTER, KULeuven & National Bank of Belgium

CHAIRMAN:

Jean-Paul LAURENT, Paris 1

https://uclouvain.be/fr/sites/mons/actualites/04-07-2017-soutenance-publique-de-these-de-saifeddine-ben-hadj.html

ABSTRACT:

“La thèse analyse la question de la stabilité du système financier international dans son ensemble et plus précisément comment améliorer sa résilience. Chaque chapitre se focalise sur un type d’acteur dans ce système complexe, à savoir les banques, les organismes de supervision et les régulateurs internationaux.

Le premier chapitre introduit de nouvelles techniques d’optimisation pour accélérer le calcul de mesure de risque dans les banques et les institutions financières. Il propose également une étude théorique pour valider les algorithmes d’optimisation proposés. Le second vise à quantifier l’externalité négative générée par les activités d’une banque ou d’une d’institution financière. Finalement, le dernier chapitre concerne la coopération entre régulateurs nationaux en présence de coûts de coordination en proposant une analyse qui s’appuie sur la théorie des jeux. ” 

 

Franco STRAGIOTTI, UCLouvain, IMMAQ/LFIN

 

Applications for Macro Stress Testing in Times of Crisis

SUPERVISOR(s):

Leonardo IANIA, UCLouvain

JURY:

Michele LENZA, UCLouvain

Jan Willem van den END, De Netherlandsche Bank

Mikael PETITJEAN, UCLouvain

Giovanni PETRELLA, Università Cattolica del S. Cuore di Milano

CHAIRMAN:

Per AGRELL, UCLouvain

https://uclouvain.be/fr/facultes/lsm/actualites/defenses-de-theses-anthony-bellofato-et-franco-stragiotti.html

ABSTRACT:

This thesis discusses a number of potential applications for macro stress tests while focusing on the differences in the behaviours of banks between normal times and times of crisis. It comprises elements related to macro stress tests and profitability, the responses of banks to a monetary policy shock, the transmission channel of solvency risk on the funding of banks as well as the interaction between capital injections and liquidity measures that took place in the US in the aftermath of the subprime crisis. The work investigates these issues using innovative econometrics techniques, in particular dynamic factor analysis, panel data econometrics and quasi-natural experiments. The findings highlight that conditional forecasts is a valid approach to stress testing and that the dynamic factor model used to generate these forecasts captures a number of features specific to banks’ risk profiles and business models. Secondly, the results identifies how news related to solvency risk affect the funding profile of a bank, supporting the view that non-linear relationships may occur in times of crisis. At last, this research argues that the capital and liquidity measures implemented in the US in the aftermath of the subprime crisis created diverging incentives for banks, influencing their lending behaviour. 

 

Anthony BELLOFATTO, UCLouvain, IMMAQ/LFIN

 

Essays on Retail Investors’ Behavior

SUPERVISOR(s):

Catherine D’HONDT, UCLouvain

JURY:

Olivier CORNEILLE, UCLouvain

Werner DE BONDT DEPAUL, University, USA

Rudy DE WINNE, UCLouvain

Patrick ROGER, University of Strasbourg

CHAIRMAN:

Ingrid PONCIN, UCLouvain

https://uclouvain.be/fr/facultes/lsm/actualites/defenses-de-theses-anthony-bellofato-et-franco-stragiotti.html

ABSTRACT:

Cette thèse s’inscrit en finance comportementale, champ de recherche interdisciplinaire qui a mis à jour l’existence de nombreux biais comportementaux chez les individus les amenant parfois à poser des choix non rationnels. Dans cette thèse, nous nous intéressons au comportement des investisseurs particuliers sur les marchés financiers. Plus précisément, nous analysons dans quelle mesure certains aspects du comportement sont affectés par la perception que l’investisseur a de ses connaissances financières (dénommée « littératie financière subjective » dans la littérature). Nos résultats montrent que l’auto-évaluation des connaissances financières permet d’expliquer les différences observées entre investisseurs en termes d’activité de trading, de diversification et de performance. Ils révèlent également un niveau de cohérence global entre la perception que l’investisseur a de ses connaissances financières et son comportement sur les marchés financiers. 

 

Thomas LECLERCQ,UCLouvain, LouRIM/CERMA

 

Essays on the engagement mechanisms in the value co-creation process: The case of gamification

SUPERVISOR(s):

Ingrid PONCIN,UCLouvain

Wafa HAMMEDI, UNamur

JURY:

Pierre VOLLE, Université Paris Dauphine

Vera BLAZEVIC, Radboud University

Hubert GATIGNON, Business School INSEAD

Pietro ZIDDA, UNamur

CHAIRMAN:

Catherine D’HONDT, UCLouvain

https://uclouvain.be/fr/sites/mons/actualites/06-10-2017-soutenance-publique-de-these-%26ndash%3B-t-leclercq.html

ABSTRACT:

Au travers de quatre essais, cette thèse de doctorat explore les mécanismes de gamification – l’utilisation de mécanismes de jeu dans des contextes de non-jeu – et analyse comment ces mécanismes peuvent être mobilisés pour générer, coordonner et maintenir l’engagement du consommateur à travers le temps. Combinant des méthodes qualitatives et quantitatives, nous mettons en évidence plusieurs dynamiques d’engagement et mesurons l’impact que peut avoir la gamification tout au long de l’expérience des participants. Nous expliquons comment la gamification agit sur l’expérience des consommateurs pour générer de l’engagement. Nos résultats montrent également que, dans certains cas, la gamification peut détériorer l’expérience des participants et donc diminuer leur niveau d’engagement. Dès lors, alors que la gamification est décrite dans la littérature comme un moyen efficace pour engager les consommateurs, nous identifions les limites de ces mécanismes et fournissons aux managers des pistes de réflexion pour mieux les gérer à travers le temps. 

 

Thomas PONGO,UCLouvain, IACCHOS/CIRTES

 

Le secteur agro-alimentaire : Des controverses aux mobilisations. Analyses d’engagements militants organisés au sein d’activités de production et de distribution.

SUPERVISOR(s):

Matthieu de NANTEUIL, UCLouvain

Marthe NYSSENS, UCLouvain

JURY:

Jean NIZET, UNamur & UCLouvain

Olivier GERMAIN, UQAM

CHAIRMAN:

Valérie SWAEN, UCLouvain

https://uclouvain.be/fr/chercher/cirtes/evenements/defense-de-these-0-1-2-3.html

ABSTRACT:

Cette thèse a pour objectif d’interroger les formes de militantisme agricole. Les dimensions politiques de l’activité de consommation ayant déjà reçu l’attention des chercheurs (Pleyers, 2011), cette recherche se concentre sur les engagements qui répondent aux limites des modes de production et de distribution dominants. Pour ce faire, quatre études distinctes ont été menées. La première enquête interroge la pluralité des initiatives de circuit-court de fruits et légumes en Région Wallonne. L’étude exploratoire des dimensions organisationnelles (Defourny et Nyssens, 2012) de treize organisations permet de construire une typologie originale des distributeurs alternatifs. Les deuxièmes et troisièmes enquêtes, quant à elles, questionnent l’activité décisionnelle d’un collectif de producteurs luttant pour la reconnaissance des spécificités et de la désidérabilité de modes de production alternatifs (locaux, biologiques et paysans). L’étude approfondie de cette décision autorise le chercheur à mettre au jour non seulement l’indésidérabilité des opérations critiques au sein de ce contexte (Boltanski et Thévenot, 1991) mais aussi les causes d’échecs argumentatifs. De nature plus réflexive, la quatrième recherche permet de souligner des apprentissages méthodologiques et paradigmatiques du chercheur. Ces enquêtes rendent possible une discussion concernant l’influence des modes de gouvernance sur le degré de militantisme des entreprises sociales (Borzaga et Depedri, 2015; Fazzi, 2012; Leviten-Reid et Fairbairn, 2011), la place des outils de gestion au sein de ces mêmes entreprises et, enfin, le potentiel expressif du dispositif sociocratique étudié. A l’issue de cette recherche, nous tentons de mettre au jour les enjeux et pistes d’action possibles pour la construction de dispositifs de certification alternatifs subversifs. 

 

Félix SOMMER, UCLouvain, LouRIM

 

Social Network Analysis, A multi-Label Graph Approach

SUPERVISOR:

François FOUSS, UCLouvain

JURY:

Sophie BÉREAU, UCLouvain

Michael EKSTRAND, Boise State University, USA

Benoît FRÉNAY, UNamur

Marco SAERENS, UCLouvain

CHAIRMAN:

Per Joakim AGRELL, UCLouvain

https://uclouvain.be/fr/sites/mons/actualites/27-10-2017-soutenance-publique-de-these-%26ndash%3B-felix-sommer.html

ABSTRACT:

“Notre travail de thèse analyse l’implication des réseaux sociaux dans une approche data mining. Dans ce contexte, différentes applications sont proposées notamment dans les domaines des graphes (graph learning), de la segmentation (clustering) et des systèmes de recommandation.

Tout d’abord, nous avons développé un nouvel algorithme à étiquettes multiples (multi-label graph learning algorithm) tenant compte de l’entièreté des données présentes dans un graphe.

Dans une seconde partie du travail, nous proposons une nouvelle méthode de segmentation qui intègre différentes distances entre les nœuds de graphes et qui permet, entre autres, la détection de communautés dans les réseaux sociaux. Cette approche se base sur une technique de kernel k-means pondéré ainsi que sur l’utilisation du critère de modularité qui donnent plus d’autonomie à l’algorithme.

La troisième contribution à notre recherche est déclinée dans le domaine des systèmes de recommandation et appliquée dans le secteur de la grande distribution. Une approche de factorisation matricielle est utilisée pour étudier les comportements d’interactions répétés lors des achats des clients en grande distribution.

Finalement, nous avons construit un algorithme de recommandation multi-niveaux que nous avons intégré dans la plateforme LensKit (LensKit recommender toolkit). Ce modèle fonctionne à deux niveaux en tenant compte, d’une part, de la nature complémentaire des biens dans leur catégorie et, d’autre part, du caractère substituable de ceux-ci.” 

 

Jonas TEUSCH, UCLouvain, IMMAQ/CORE

 

Horizontal integration under yardstick competition

SUPERVISOR(s):

Per AGRELL, UCLouvain

Axel GAUTIER, ULIEGE

JURY:

Paul BELLEFLAMME, UCLouvain

Mette BJÖRNDAL, Norwegian School of Economics, Norway

Antonio ESTACHE, ULB

CHAIRMAN:

Sergio PERELMAN, ULIEGE

https://uclouvain.be/fr/facultes/lsm/actualites/defense-de-these-de-jonas-teusch-le-21-novembre-2017.html

ABSTRACT:

“Horizontal integration through mergers and cross-ownership is common in industries regulated by yardstick competition. However, even though yardstick competition is applied to sectors of vital economic importance, such as energy and water networks, the welfare effects of horizontal integration in these settings have largely escaped scientific scrutiny. The dissertation therefore studies the welfare implications of horizontal integration under yardstick competition and identifies potential trade-offs. Specifically, whereas mergers and cross-ownership may bring about efficiency gains, there is a possibility that horizontal integration simultaneously decreases the effectiveness of regulation, benefitting certain firms at the expense of consumers and competitors. Key conditions for such strategic effects to occur and to dominate efficiency effects are derived in a principal-agent model. The thesis also demonstrates that the issue is not merely of academic interest, but has affected the practical application of yardstick competition in the electricity distribution industries of both Belgium and Norway.

Chapter 1 analyses how horizontal mergers, joint ventures and regulatory decentralisation complicate the application of yardstick competition in Belgian electricity distribution. Chapter 2 develops a theoretical model of mergers under yardstick competition – formalising the welfare trade-offs at the heart of this dissertation. Chapter 3 leverages Data Envelopment Analysis to quantify both efficiency and strategic effects of horizontal restructuring in Norwegian electricity distribution and points to a recent merger that appears to have been driven by strategic motivations. Chapter 4 uses several econometric identification strategies to establish that between 2007 and 2015, cross-ownership increased firm performance in Norwegian electricity distribution – which suggests that the net welfare effects were positive in this application. ” 

 

Matias SCHUSTER,UCLouvain, IMMAQ/CORE

 

Supply chain network design under demand uncertainty

SUPERVISOR(s):

Jean-Sébastien TANCREZ, UCLouvain

JURY:

El-Houssaine AGHEZZAF, Universiteit Gent

Mathieu VAN VYVE, UCLouvain

Stefan MINNER, Technische Universität München

Philippe CHEVALIER, UCLouvain

CHAIRMAN:

Per AGRELL, UCLouvain

https://uclouvain.be/fr/facultes/lsm/actualites/defenses-de-theses-matias-schuster-et-virginie-bruneau.html

ABSTRACT:

Due to the increasing volatility and complexity of global markets, the design and management of supply chains has become crucial in the success of a company. Supply chain network design decisions (i.e. number and location of facilities), have a significant impact on the performance of the company in the long term, and are directly affected by demand uncertainty. Mathematical models are an essential tool for companies to manage their supply chain efficiently, and thereby to reduce costs (e.g. facility, inventory, transportation) and to improve customer service. The purpose of this thesis is to provide different supply chain design models, integrating location and inventory decisions, that address the impact of demand uncertainty from different points of view. The ultimately goal is to provide managerial insights that may support the decision-making process in the supply chain design phase, and may allow to mitigate the impact of demand uncertainty. 

 

Virginie BRUNEAU, UCLouvain, LouRIM/CERMA

 

Assessing the effectiveness of loyalty programs in building engagement and loyalty

SUPERVISOR(s):

Valérie SWAEN, UCLouvain

Pietro ZIDDA, UNamur

JURY:

Alain DECROP, UNamur

Nathalie DEMOULIN, IESEG School of Management

Yuping LIU-THOMPKINS, Old Dominion University

CHAIRMAN:

Marie-Paule KESTEMONT, UCLouvain

https://uclouvain.be/fr/facultes/lsm/actualites/defenses-de-theses-matias-schuster-et-virginie-bruneau.html

ABSTRACT:

“There is no doubt that loyalty programs are still popular. But are they still effective?

Marketers continue to put more and more time and money into their programs, but are they getting the kind of payoffs they expect in customer engagement and loyalty? Taking this issue as a starting point, this doctoral dissertation assesses the effectiveness of loyalty programs in building customer engagement and loyalty across three essays.  Specifically, in the first essay a valid scale for customer engagement with loyalty programs is developed and its link with company engagement is assessed. The second essay identifies what reward types and communication features should be used to make members more engaged with LPs.  The third essay identifies the behavioural patterns and types of online communication that tend to make customers sustainably loyal towards a company rather than short-term program loyal. ” 

 

Joseph GILLAIN, UNamur

 

Essays on Requirements Optimization Problems in the Core Ontology for Requirements Engineering

SUPERVISOR(s):

Stéphane FAULKNER, UNamur

Monique SNOECK, KULeuven

JURY:

Ivan JURETA – UNamur

Yves WAUTELET – KULeuven

Nauman QURESHI – King Faisal University

CHAIRMAN:

Annick CASTIAUX, UNamur

Sous-domaine Sciences économiques et de gestion

http://agenda.unamur.be/upevent.2017-06-06.6750280472/view

ABSTRACT:

In contemporary societies, Information Systems have become ubiquitous. We use them, for instance, in accounting, marketing, human resource and also beyond the business world in health care, education or even daily life activities. It has become common to say that such systems should be of high quality, that is, they should ensure the satisfaction of the needs they were intended for.

Requirements Engineering is the field dedicated to investigate those requirements as well as the conditions for their satisfaction. However, previous and current research has mainly concentrated its effort on methods and concepts able to prove that a particular system could fulfill the requirements. In contrast, few effort had the purpose of discussing about how we should compare alternative solutions and select the optimal one.

This thesis suggests a new formulation of the Requirement Problem which sets the process of optimization in the center of concerns. It shows how different criteria can be used to design optimization models and provides tools to resolve them. Through those models, we describe how the fields of Requirement Engineering and Mathematical Optimization can be connected. 

 

Sarah BOURAGA, UNamur

 

The Design of an Online Social Network and its Knowledge-Based Recommendation System

SUPERVISOR(s):

Stéphane FAULKNER, UNamur

Ivan JURETA, UNamur

JURY:

Michael PETIT, UNamur

Manuel KOLP, UCLouvain

Anna PERINI, Sofware Engineering – FBK – CIT

Haris MOURATIDIS, University of Brighton

CHAIRMAN:

Annick CASTIAUX, UNamur

http://agenda.unamur.be/upevent.2017-03-17.5763988381/view

ABSTRACT:

Over the last decade, Online Social Networks (OSNs) have been growing quickly to become some of the largest systems available. Their users are sharing more and more content, and in turn have access to vast amounts of information from and about others. This increases the risk of information overload for every user.

Information overload usually refers to the difficulty to make decisions when there is too much information. In such situations, the decision-maker is confronted to so much information that it may become unclear what the exact decision problem is, what the alternatives are, how to compare them in order to single one out.

We are interested in how to mitigate information overload for users of OSNs. Specifically, we are interested in how to design an OSN and its Recommendation Systems (RSs), which filter out and prioritize content for users, and thereby take over some of the decision-making effort from the user. The overall idea is that there can be an overload of information available to users of an OSN, and we want to design an OSN with an integrated RS which processes the information, so as to recommend to the user only those which, according to some specific criteria are the most relevant to that user. 

 

Marco GERACI, UNamur

 

Essays on Complexity in the Financial System

SUPERVISOR(s):

Jean-Yves GNABO, UNamur

Davy PAINDAVEINE, ULB

JURY:

Christaine BAUMEISTER, University of Notredam, Etas Unis

Sophie BEREAU, UNamur

Catherine DEHON, ULB

David VEREDAS, Vlerick Business School

CHAIRMAN:

Annick Castiaux, UNamur

http://agenda.unamur.be/upevent.2017-09-05.2989055221

ABSTRACT:

The goal of this thesis is to study the two key aspects of complexity of the financial system: interconnectedness and nonlinear relationships.

In Chapter 1, I contribute to the literature that models the nonlinear relationship between variables at the extremes of their distribution. In particular, I study the nonlinear relationship between stock prices and short selling.

In Chapter 2, I propose a measure of interconnectedness that takes into account the time-varying nature of connections between financial institutions. Here, the parameters underlying comovement are allowed to evolve continually over time through permanent shifts at every period. The result is an extremely flexible measure of interconnectedness, which uncovers new dynamics of the US financial system and can be used to monitor financial stability for regulatory purposes.

In Chapter 3, rather than assuming interconnectedness as an exogenous process that has to be inferred, as is done in Chapter 2, I model interconnectedness as an endogenous function of market dynamics. Here, I take interconnectedness as the realized correlation of asset returns. I seek to understand how short selling can induce higher interconnectedness by increasing the negative price pressure on pairs of stocks. 

 

 


—————–