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Document Server@UHasselt (58.026 recursos)

Repository of the University of Hasselt containing publications in the fields of statistics, computer science, information strategies and material from the Institute for behavioural sciences.

Transportation Research Institute

Mostrando recursos 1 - 20 de 591

  1. Road safety performance evaluation and policy making by data envelopment analysis: A case study of provincial data in Iran

    Behnood, H. R.; Ayati, E.; Hermans, Elke; Neghab, M. A. Pirayesh
    Considering the need to invest in road safety programs, an efficiency analysis on implemented countermeasures is required. The system presented in this study is designed to evaluate the efficiency related to measures annually implemented throughout 30 provinces of Iran, specifically in 2008 and 2009. The model calculates a relative inefficiency index for each province and in each year, using the Data Envelopment Analysis (DEA) method. Each province in each year is defined as a Decision Making Unit (DMU) in DEA analysis. The inefficiency index is defined as the proportion of the weighted sum of road fatality risk indices to the...

  2. Assessing The Overall Driving Performance Of Older-Drivers

    BABAEE, Seddigheh; SHEN, Yongjun; HERMANS, Elke; BRIJS, Tom; WETS, Geert; CUENEN, Ariane
    This study investigates the relative performance of older drivers at the individual level, based on specific measures of functional and driving abilities. To do so, 55 participants aged 70 years and above completed tests of an assessment battery of psychological and physical aspects as well as knowledge of road signs; moreover, they took a driving simulator test in which specific driving situations that are known to cause difficulties for older drivers were included. To evaluate the overall performance of each driver, all the above information was combined by using the concept of composite indicators, and the technique of data envelopment analysis,...

  3. Assessing individual driver’s relative performance at curve: applying Data Envelopment Analysis on simulator data

    BABAEE, Seddigheh; SHEN, Yongjun; HERMANS, Elke; WETS, Geert; BRIJS, Tom; ARIEN, Caroline
    This study investigates the performance of drivers at the individual level, at two different curves, using data from a driving simulator in order to identify the best drivers within the sample and to gain insight into the most problematic behavior of each driver. To this end, 34 participants varying in age and gender completed two particular simulator scenarios and their speed, acceleration and lateral position, were monitored at various points. The concept of composite indicators, which combines single indicators into one index score, was employed, and the technique of data envelopment analysis – an optimization model for measuring the relative...

  4. Bayesian inference for transportation origin-destination matrices: the Poisson-inverse Gaussian and other Poisson mixtures

    PERRAKIS, Konstantinos; KARLIS, Dimitris; COOLS, Mario; JANSSENS, Davy
    Transportation origin-destination analysis is investigated through the use of Poisson mixtures by introducing covariate-based models which incorporate different transport modelling phases and also allow for direct probabilistic inference on link traffic based on Bayesian predictions. Emphasis is placed on the Poisson-inverse Gaussian model as an alternative to the commonly used Poisson-gamma and Poisson-log-normal models. We present a first full Bayesian formulation and demonstrate that the Poisson-inverse Gaussian model is particularly suited for origin-destination analysis because of its desirable marginal and hierarchical properties. In addition, the integrated nested Laplace approximation is considered as an alternative to Markov chain Monte Carlo sampling...

  5. Adapting inventory models for handling various payment structures using net present value equivalence analysis

    BEULLENS, Patrick; JANSSENS, Gerrit
    Classic inventory models use average cost functions. It is generally accepted that these models should account for the time value of money. They do so not by considering the timing of cash-flows, but by including opportunity costs. The Net Present Value (NPV) framework has long been used to compare these models with. We formalise NPV Equivalence Analysis (NPVEA) under various payment structures, and apply it to a few classic inventory models. While taking the linear approximation is typically part of the process to find equivalence, the essence is to disregard the parameters of a classic inventory model but instead start...

  6. Interval data envelopment analysis for modeling driving performance over time

    BABAEE, Seddigheh; SHEN, Yongjun; HERMANS, Elke; BRIJS, Tom; WETS, Geert

  7. Serious Injuries: An Additional Indicator to Fatalities for Road Safety Benchmarking

    SHEN, Yongjun; HERMANS, Elke; BAO, Qiong; BRIJS, Tom; WETS, Geert
    Objectives: Almost all of the current road safety benchmarking studies focus entirely on fatalities, which, however, represent only one measure of the magnitude of the road safety problem. The main objective of this article was to investigate the possibility of including the number of serious injuries in addition to the number of fatalities for road safety benchmarking and to further illuminate its impact on the countries' rankings. Methods: We introduced the technique of data envelopment analysis (DEA) to the road safety domain and developed a DEA-based road safety model (DEA-RS) in this study. Moreover, we outlined different types of possible...

  8. Combining driving performance information in an index score: a simulated curve-taking experiment

    BABAEE, Seddigheh; SHEN, Yongjun; HERMANS, Elke; WETS, Geert; BRIJS, Tom; ARIEN, Caroline
    This study used data from a driving simulator to identify the best car drivers in a sample and gain insight about the most problematic behavior of each driver. To this end, 38 participants varying in age and gender were enrolled to take part in a particular simulator scenario, curve taking. Based on a review of the literature, a driver???s speed, acceleration, and lateral position are the three most important driving performance indicators. In the simulations, the three indicators were monitored at points before, during, and after a curve. As a widely accepted tool for performance monitoring, benchmarking, and policy analysis,...

  9. Blood pressure changes in association with black carbon exposure in a panel of healthy adults are independent of retinal microcirculation.

    LOUWIES, Tijs; Nawrot, Tim; Cox, Bianca; Dons, Evi; Penders, Joris; PROVOST, Eline; Int Panis, Luc; De Boever, Patrick
    Exposure to ambient particulate matter and elevated blood pressure are risk factors for cardiovascular morbidity and mortality. Microvascular changes might be an important pathway in explaining the association between air pollution and blood pressure. The objective of the study was to evaluate the role of the retinal microcirculation in the association between black carbon (BC) exposure and blood pressure.We estimated subchronic BC exposure based on 1-week personal measurements (μAethalometer, AethLabs) in 55 healthy nurses. Blood pressure and retinal microvasculature were measured on four different days (range: 2–4) during this week.Subchronic BC exposure averaged (± SD) 1334 ± 631 ng/m3 and...

  10. Integrated inventory-transportation with common carrier freight charges

    Suwandechochai, Rawee; Janssens, Gerrit K.
    Inventory management models aim to find an optimal solution in terms of minimal costs by proposing decisions on delivery quantities using data on order quantity purchasing costs and holding costs. Goods have to be transported from the supplier to the customer and the transport (freight charge) cost can be included in various ways. Some production companies make use of a private carrier, offering transport services only for one or a few companies. Most companies make use of the services of a common carrier, which offers its transport service to whatever customer in need for transporting goods. A common carrier offers...

  11. Optimisation of vessel journeys for oil products distribution

    HOANG, Thi Minh Ha; Janssens, Gerrit K.
    The research deals with a routing and scheduling problem of specialized vessels carrying oil products. A heterogeneous fleet transports the products from several loading ports to several discharging ports. Time windows are involved on the discharging side due to production and storage plans, and on the loading side as a result of negotiations with customers. Demand may be delivered by more than one vessel. The routing and scheduling problem is formulated as a mixed-integer programming problem. It includes information and constraints about the supply and demand, but also about the vessels, the vessel routes, and the ports and their restrictions.

  12. Training inhibitory control in older drivers: the effect on inhibitory control and simulated driving ability

    JONGEN, Ellen

  13. Training inhibitory control in older drivers: the effect on inhibitory control and simulated driving ability

    CUENEN, Ariane; JONGEN, Ellen; BRIJS, Tom; RUITER, Rob; Guerrieri, R.; WETS, Geert

  14. Training inhibitory control in older drivers: the effect on inhibitory control and simulated driving ability

    CUENEN, Ariane; JONGEN, Ellen; BRIJS, Tom; BRIJS, Kris; RUITER, Rob; Guerrieri, R.; WETS, Geert

  15. Cognitive training and driving: symposium overview

    JONGEN, Ellen

  16. Measuring the effect of working memory load on visuospatial attention during a simulated drive: an event-related potentials study

    ROSS, Veerle; JONGEN, Ellen; Vossen, A.Y.; Smulders, F.T.Y.; BRIJS, Tom; BRIJS, Kris; RUITER, Rob; WETS, Geert

  17. Training inhibitory control in older drivers: the effect on inhibitory control and simulated driving ability

    CUENEN, Ariane; JONGEN, Ellen; BRIJS, Tom; BRIJS, Kris; RUITER, Rob; Guerrieri, R.; WETS, Geert

  18. Linking the visual search skills of safe driving to executive functions among young novice drivers

    WANG, Weixin; JONGEN, Ellen; BRIJS, Kris; BRIJS, Tom; RUITER, Rob; WETS, Geert

  19. Self-affirmation enhances open-mindedness: An ERP study on early attention allocation

    Silbernagel, E.; RUITER, Rob; JONGEN, Ellen; Harris, P.

  20. Does Working Memory Capacity Offer Protection to Driving Performance when Working Memory Load Increases?

    ROSS, Veerle; JONGEN, Ellen; BRIJS, Tom; BRIJS, Kris; Lutin, M.; VAN VLIERDEN, Karin; WETS, Geert

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