Daniel De Wolf

Daniel De Wolf
Université du Littoral Côte d'Opale (ULCO) | ULCO · Département d'Economie-Gestion

Ph. D. in Applied Mathematics

About

51
Publications
76,907
Reads
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1,004
Citations
Introduction
De Wolf Daniel currently Management Professor at the Département d'Economie-Gestion, Université du Littoral Côte d'Opale (ULCO, Dunkerque, France). He is also invited professor at the Center for Operations Research and Econometrics (CORE, UCL, Louvain-La-Neuve, Belgium). He does research in Applied Mathematics and Environmental Economics. His current research project is 'Optimisation of hydrogen pipes transmission networks.'
Additional affiliations
September 2003 - September 2013
Université du Littoral Côte d'Opale (ULCO)
Position
  • Head of Department
September 1995 - August 2003
Université de Lille
Position
  • Maitre de conférences
September 1992 - August 1995
Université Libre de Bruxelles
Position
  • Senior Researcher

Publications

Publications (51)
Article
Full-text available
We extend a multimodal transport model to simulate an increase of the market share of electric vehicles. The model, which is described in detail in Kilani et al. (Sustainability 14(3):1535, 2022), covers the north of France and includes both urban and intercity trips. It is a multi-agents simulation based on the MATsim framework and calibrated on o...
Preprint
Full-text available
e developed a passenger transport model for the North of France and used it to discuss the impacts of some policies focusing on the limitations of polluting gas emissions and congestion. The model is calibrated for the North of France and includes both urban and intercity trips. Four transport modes are considered: walking, biking, public transport...
Article
Full-text available
We developed a passenger transport model for the North of France and used it to discuss the impacts of some policies focusing on the limitations of polluting gas emissions and congestion. The model is calibrated for the North of France and includes both urban and intercity trips. Four transport modes are considered: walking, biking, public transpor...
Article
Full-text available
We developed a passenger transport model for the North of France and used it to discuss the impacts of some policies focusing on the limitations of polluting gas emissions and congestion. The model is calibrated for the North of France and includes both urban and intercity trips. Four transport modes are considered: walking, biking, public transpor...
Article
Full-text available
We present here a characterization of the Clarke subdifferential of the optimal value function of a linear program as a function of matrix coefficients. We generalize the result of Freund (1985) to the cases where derivatives may not be defined because of the existence of multiple primal or dual solutions.
Article
Full-text available
The paper presents the mathematical properties of several formulations for the gas transmission problem that account for the nonlinear flow pressure relations. The form of the nonlinear flow pressure relations is such that the model is in general nonconvex. However, we show here that under a restrictive condition (gas inlet or gas pressure fixed at...
Research
Full-text available
The present work provides an international comparison of the energy intensity and the carbon dioxide intensity in road transport for a group of 90 countries over the period 1980-2012. This paper attempts to perform a comparative analysis to find the most appropriate mapping of the energy performance in road transport taking into account the three d...
Article
Full-text available
In this paper, we formulate and solve a real life coal blending problem using a Column Generation Approach. The objective of the model is to prescribe optimal mixes of coal to produce coke. The problem is formulated as a mixed integer program. It involves various types of constraints arising from technical considerations of the blending process. Th...
Article
The development of a hydrogen economy will need a transportation infrastructure to deliver hydrogen from production sites to end users. For the specific case of hydrogen, pipelines networks compete with other hydrogen carriers: compressed gas trucks and liquid cryogenic trucks. In this paper, we deal with the determination of the temporal deploymen...
Conference Paper
Full-text available
Le problème considéré est un problème industriel réel : il s’agit de la gestion d’un groupe de cokeries où les achats de charbons et l’allocation de la demande entre les différentes usines sont gérés de manière centrale tandis que le plan de production par quinzaine est déterminé au niveau des usines. Une méthode de génération de colonnes et de rév...
Article
Full-text available
The present paper studies the BP crisis management of the Deepwater Horizon Disaster which occurred on April 20th, 2010. The authors content-analysed a large amount of secondary data from various sources, used the three-phase crisis management model and found that BP management of this crisis failed at many levels. The authors mainly highlighted fo...
Article
This work considers the problem of the optimal design of an hydrogen transmission network. This design problem includes the topology determi- nation and the pipelines dimensioning problem. We define a local search method that simultaneously looks for the least cost topology of the net- work and for the optimal diameter of each pipe. These two probl...
Article
Full-text available
On the 20th of April 2010, an outstanding explosion of the BP Deepwater Horizon oil rig situated in the Golf of Mexico caused the largest maritime disaster oil spill in the USA history and particularly caused considerable reputation and financial losses to BP.To deal with the spill oil as well as reputation and financial losses, the company particu...
Article
Full-text available
Following the emergence of stakeholders’ societal awareness, retailers adopted different types of social actions and have recently begun to publish social reports to demonstrate their commitment to sustainability and social responsibility in order to be perceived as good corporate citizens. The purpose of this paper is to analyze and to discuss app...
Article
Full-text available
This paper aims to investigate Multi-National Corporations (MNC) Chief Executives Officers (CEO) perception of Corporate Social Responsibility (CSR) and their communication about it. As the key decision makers, CEOs have nowadays, a central role to play in implementing CSR. Thus, such investigation could be very useful for a better understanding of...
Article
Full-text available
De Wolf and Smeers [9] consider the problem of the optimal dimension- ing of a gas transmission network when the topology of the network is known. The pipe diameters must been chosen to minimize the sum of the investment and oper- ating costs. This two stage problem was solved by application of the bundle method for nonsmooth optimization. This mod...
Article
Full-text available
This paper aims to investigate MultiNational Corporations (MNC) Chief Executives Officers (CEO) perception of Corporate Social Responsibility (CSR) and their communication about it. As the key decision makers, CEOs have nowadays, a central role to play in implementing CSR. Thus, such investigation could be very useful for a better understanding of...
Article
Full-text available
L’objet de cet article est une étude quantitative du risque, autour de la problématique principale de la prise de décision d’investissement en amont pétrolier (exploration & production). L’objectif premier est de fournir aux décideurs un outil d’aide à la décision qui va leur permettre de choisir prudemment leurs stratégies d’investissement et de r...
Conference Paper
L’objet de cet article est une étude quantitative du risque, autour de la problématique principale de la prise de décision d’investissement en amont pétrolier (exploration & production). L’objectif premier est de fournir aux décideurs un outil d’aide à la décision qui va leur permettre de choisir prudemment leurs stratégies d’investissement et de r...
Article
Full-text available
Following the emergence of stakeholders societal awareness, retail-ers adopted different types of social actions and have recently begun to publish social reports to demonstrate their commitment to sus-tainability and social responsibility in order to be perceived as good corporate citizens. The purpose of this paper is to analyze and to discuss th...
Article
Full-text available
The exploration and development of an oil field faces many un-certainties related with yields and costs throughout the project life cycle. For example, potential reserves, investments (Capex), operat-ing costs (Opex), production rate, oil and gas price, geological success rate, and the train of spending, particularly for sub-sea wells are often unc...
Article
Full-text available
Two important characteristics of petroleum exploration and pro-duction investment are the high financial amounts and uncertainties. For these reasons, the risk analysis should be implemented in the projects evaluation and the selection process. Depending on their available resources, petroleum companies choose a number of projects on the basis of s...
Conference Paper
Full-text available
L’hydrogène est considéré par les spécialistes comme l’une des solutions potentielles face aux enjeux énergétiques et environnementaux à venir, mais son développement nécessitera certainement d’importants moyens de transport entre les sites de production et les consommateurs. Un réseau de canalisations de transport/distribution pourrait assurer ce...
Conference Paper
Full-text available
RESUME : L'hydrogène est considéré par les spécialistes comme l'une des solutions potentielles face aux enjeux énergétiques et environnementaux à venir, mais son développement nécessitera certainement d'importants moyens de transport entre les sites de production et les consommateurs. Un réseau de canalisations de transport/distribution pour-rait a...
Article
Full-text available
In the present paper, we consider the problem of gas transmis-sion through a network of pipelines. This problem was previously considered by De Wolf and Smeers (2000) in the case of a gas company that integrated its gas buying and transportation functions. Today, these functions have been separated. This work reflects upon this new situation for th...
Conference Paper
Full-text available
Cet article traite du problème de conception optimale d’un réseau de distribution d’hydrogène par gazoducs pour alimenter un ensemble de points de consommation. L’apport de cet article réside dans l’élaboration d’une méthode de conception spécifique aux réseaux de canalisations couplant détermination de la topologie et évaluation des capacités qui...
Article
Full-text available
The purpose of this paper is to show how the operations research techniques can help to evaluate the emissions of polluting gases from road traffi c in urban area. Our practical study case is the center of Tunis city. To evaluate the emissions of several polluting gases (CO, CO2, SO2, NOx, CH4 and VOC), we have combined the traffi c assignment mode...
Article
Full-text available
In (7), De Wolf and Smeers consider the problem of the gas distri- bution through a network of pipelines. The problem was formulated as ac ost minimization subject to nonlinear flow-pressure relations, ma- terial balances and pressure bounds. The practical application was the Belgian gas transmission network. This model does not reflect any more th...
Article
The problem considered in this paper is a real world problem. It concerns the management of the deliveries of coal to the several plants of a coke industry firm in order to meet the demand of several clients at minimal purchasing, transportation and production cost. The problem is solved using a column generation technique. At the lower level, a mi...
Chapter
Full-text available
In this paper, we present a model for dynamic traffic assignment in urban transportation networks. The transportation demand is given by the number of users traveling from the same origin to the same destination and having the same desired arrival time. The model determines for each user both the path and the departure time so that he cannot decrea...
Article
Full-text available
We present here a characterization of the generalized derivative of the optimal value of the objective function of a linear program as a function of matrix coefficients. We generalize the result of Freund (1935) to the cases where derivatives may not be defined because of the existence of multiple primal or dual solutions.
Article
Full-text available
The problem of distributing gas through a network of pipelines is formulated as a cost minimization subject to nonlinear flow-pressure relations, material balances, and pressure bounds. The solution method is based on piecewise linear approximations of the nonlinear flow-pressure relations. The approximated problem is solved by an extension of the...
Article
Full-text available
this paper, we develop a new dynamic user equilibrium model that includes route choices and departure time decisions on a multiple origin-destination network. The transportation demand is the number of users leaving their origin to reach their des- tination within a time window around the desired arrival time. The model determines for each user a c...
Article
Full-text available
We present an extension of the Simplex method for solving prob- lems with piecewise-linear functions of individual variables within the constraints of otherwise linear problems. This work generalizes a pre- vious method of Fourer that accommodate piecewise-linear terms in objective functions by extending the notion of nonbasic variable to a variabl...
Article
Full-text available
We consider a stochastic version of the Stackelberg-Nash-Cournot model proposed by Murphy et al. (Murphy, F. H., H. D. Sherali, A. L. Soyester. 1983. Stackelberg-Nash-Cournot equilibria characterizations and computations. Oper. Res. 31 253--276.). In the first stage, the leader chooses and announces his production level taking into account the reac...
Article
Full-text available
We develop an algorithm to solve the problem of the optimal dimensioning of a fluid (gas or water) transmission network when the topology of the network is known. The pipe diameters must been chosen to minimize the sum of the investment cost and of the operations cost. This two level problem is solved by application of the bundle method for nonsmoo...
Article
Full-text available
The paper presents the mathematical properties of several formula- tions for the gas transmission problem that account for the nonlinear flow pressure relations. The form of the nonlinear flow pressure re- lations is such that the model is in general nonconvex. However, we show here that under a restrictive condition (gas inlet or gas pressure fixe...
Article
Full-text available
We derive here first and second-order derivatives of the optimal value of the objective function of a linear program with respect to matrix coefficients and generalize these results to the cases where derivatives may not be defined because of the existence of multiple primal or dual solutions.
Article
Full-text available
Résumé In (7), De Wolf and Smeers consider the problem of the gas distribution through a network of pipelines. The problem was formulated as a cost minimization subject to nonlinear flow-pressure relations, ma- terial balances and pressure bounds. This model does not reflect any more the current situation on the gas market. Today, the transportatio...

Projects

Projects (2)
Project
We develop transport models and simulations to evaluate policies that favor transition to less pollutant emissions.
Project
In the case of the development of an hydrogen energy market to propulse the cars, new transmission infrastructures will be needed from production sites to the refilling station for cars. We develop an economic model to optimise this new transmission networks.