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ORBi Open Repository and Bibliography (249,035 recursos)
In may 2007, the ULg's Administrative Board (joined in June 2007 by the FUSAGx) decided to create an institutional repository and defined a strong institutional self-archiving policy to increase the visibility, accessibility and impact of the University's publications (Board's decision). This decision led to the official launch, in November 2008, of the ORBi platform including both the Academic Bibliography and the Institutional Repository of the Wallonia-Europe University Academy.

Business & economic sciences => Quantitative methods in economics & management

Mostrando recursos 1 - 20 de 314

1. Nonparametric estimation and bootstrap inference on recent trends in atmospheric ethane - Friedrich, Marina; Reuvers, H.; Smeekes, S.; Urbain, J.-P.; Bader, Whitney; Franco, Bruno; Lejeune, Bernard; Mahieu, Emmanuel
Ethane is the most abundant non-methane hydrocarbon in the Earth's atmosphere and an important precursor of tropospheric ozone. Its monitoring is therefore crucial for the characterization of air quality and of the transport of tropospheric pollution. Ethane is also an indirect greenhouse gas, influencing the atmospheric lifetime of methane. The main sources of ethane are located in the northern hemisphere, and the dominating emissions are associated to production and transport of natural gas. A preliminary trend analysis was conducted using measurements performed in the Swiss Alps. Over the last two decades, the trend of ethane showed a decline of around...

2. Valeurs de l'information et performances algorithmiques pour des problèmes multi-périodes et stochastiques - Pironet, Thierry
voir document

3. Combining acceleration techniques for pricing in a VRP with time windows - Michelini, Stefano; Arda, Yasemin; Küçükaydin, Hande
Peer reviewed

4. A robust statistical approach to select adequate error distributions for financial returns - Hambuckers, julien; Heuchenne, Cédric
Peer reviewed

5. A robust statistical approach to select adequate error distributions for financial returns - Hambuckers, julien; Heuchenne, Cédric
Peer reviewed

6. Modeling operational losses: a conditional Generalized Pareto regression based on a single-index assumption - Hambuckers, julien; Heuchenne, Cédric; Lopez, Olivier
In this paper, we consider a regression model in which the tail of the conditional distribution of the response can be approximated by a Generalized Pareto distribution. Our model is based on a semiparametric single-index assumption on the conditional tail index while no further assumption on the conditional scale parameter is made. The underlying dimension reduction assumption allows the procedure to be of prime interest in the case where the dimension of the covariates is high, in which case the purely nonparametric techniques fail while the purely parametric one are too rough to correctly fit to the data. We propose...

7. Modeling operational losses: a conditional Generalized Pareto regression based on a single-index assumption - Hambuckers, julien; Heuchenne, Cédric; Lopez, Olivier
In this paper, we consider a regression model in which the tail of the conditional distribution of the response can be approximated by a Generalized Pareto distribution. Our model is based on a semiparametric single-index assumption on the conditional tail index while no further assumption on the conditional scale parameter is made. The underlying dimension reduction assumption allows the procedure to be of prime interest in the case where the dimension of the covariates is high, in which case the purely nonparametric techniques fail while the purely parametric one are too rough to correctly fit to the data. We propose an...

8. Nonparametric control charts: economic statistical design - Marcos Alvarez, Alejandro; Heuchenne, Cédric; Faraz, Alireza
This paper studies economic statistical designs (ESD) for nonparametric control charts based on the sign and Wilcoxon tests. The main advantage of the procedures is that, except for the tested location parameter, they do not use either any parametric distribution for the quality characteristic or any information about the possible involved parameters, neither in the in-control nor in the out-of-control state. This is made possible by minimizing a cost function specified independently of these quantities. Unlike the ESD for the $\overline{x}$ chart, the resulting charts designs are robust to changes of the distributions of the observations (in control or out...

9. Tightening linearizations of non-linear binary optimization problems - Rodriguez Heck, Elisabeth; Crama, Yves

10. Continuous Departure Time of Day Preferences for Continental U.S. Airline Markets Segmented by Distance, Direction of Travel, Number of Time Zones, Day of Week and Itinerary Type - Lurkin, Virginie; Garrow, Laurie; Higgins, Matthew; Newman, Jeffrey; Schyns, Michael
Airlines use itinerary choice models to allocate the total number of passengers in a city pair to specific itineraries. In a related paper, we estimated a multinomial logit (MNL) itinerary choice model using database of more than 3 million tickets for Continental U.S. markets provided by the Airlines Reporting Corporation that accounted for price endogeneity. The size and comprehensiveness of our database allowed us to estimate highly refined continuous departure time of day preference curves that account for distance, direction of travel, the number of time zones traversed, departure day of week and itinerary type (outbound, inbound or one-way). This...

11. Accounting for Price Endogeneity in Airline Itinerary Choice Models: An Application to Continental U.S. Markets - Lurkin, Virginie; Garrow, Laurie; Higgins, Matthew; Newman, Jeffrey; Schyns, Michael
Peer reviewed

12. A Comparison of Departure Time of Day Formulations - Lurkin, Virginie; Garrow, Laurie; Higgins, Matthew; Newman, Jeffrey; Schyns, Michael
Peer reviewed

13. Monitoring Delivery Networks in supply chains - Faraz, Alireza
Peer reviewed

14. Monitoring distribution networks in supply chains - Faraz, Alireza
Peer reviewed

15. Monitoring partnership networks- A graph theory approach - Faraz, Alireza; Treiblmaier, Horst; Gerschberger, Markus
Peer reviewed

16. Linearization and quadratization approaches for non-linear 0-1 optimization - Rodriguez Heck, Elisabeth; Crama, Yves

17. PDIRPTW Instances - Limbourg, Sabine

18. Comment réduire l'impact environnemental pour le transport de marchandises ? - Limbourg, Sabine
Avec l'internationalisation des activités économiques, la demande de transport a considérablement augmenté suite à l’allongement des distances et à la multiplication des fréquences d’envois. Pour répondre aux exigences du e-commerce et des livraisons à domicile, de nouveaux schémas logistiques sont indispensables. Ces défis doivent être relevés tout en minimisant les nuisances environnementales. A l'occasion de ce lunch-conférence, Sabine Limbourg exposera le résultat de ses recherches, basées sur des méthodes quantitatives, explorant trois options permettant de réduire l'impact environnemental pour le transport des marchandises. Ces options sont le transport intermodal qui combine efficacement plusieurs modes de transport, l'intégration de véhicules électriques...

19. Several constructive heuristics for the three dimensional Multiple Bin Size Bin Packing Problem with air transportation constraints - Paquay, Célia; Limbourg, Sabine; Oliveira, José Fernando; Schyns, Michael

20. A best fit decreasing algorithm for the three dimensional bin packing problem - Paquay, Célia; Schyns, Michael; Limbourg, Sabine

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