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Search Results: 1 - 10 of 1633 matches for " Bart Dewancker "
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Re-Finding PL.AC.E. for Walking: Assessment of Key-Elements Using Questionnaire  [PDF]
Fritz Akhmad Nuzir, Bart Dewancker
Current Urban Studies (CUS) , 2015, DOI: 10.4236/cus.2015.34023
Abstract: Many studies had already been conducted to acknowledge the contribution of walking in sustainable urban development. After conducting a literature study, authors identified the 3 (three) keyelements and introduced them as PL.AC.E. (abbreviation of Profile, Activity, and Environment), of the pedestrian. The Pedestrian Profile was defined as a combination of the following key-attributes: age; financial income; physical condition; gender; mobility choice; employment and education; social cultural capital; pedestrian type; and public transportation usage. The Pedestrian Activity was defined from the key-attributes as follow: walking-related purposes; social interaction; walking intensity; walking habits; and transport modes interaction. Then the Pedestrian Environment was defined within key-attributes of: spatial planning; walk-ability; neighborhood livability; traffic safety; pedestrian facilities (hard elements); pedestrian facilities (soft elements); and environmental quality. In this study, authors would assess those key-elements by distributing a questionnaire to a group of freshmen of the Department of Architecture in the University of Kitakyushu, Japan as a trial experiment. Total 58 responses were recorded and then analyzed using correlations type statistical analysis. It was then concluded that there are indications that those key-elements could be addressed in the planning process of a walk-able urban environment. However in order to validate the result, authors would continue to further distribute the questionnaire to various respondents within different case study areas.
Calibration and Validation of Strategic Freight Transportation Planning Models with Limited Information  [PDF]
Bart Jourquin
Journal of Transportation Technologies (JTTs) , 2016, DOI: 10.4236/jtts.2016.65023
Abstract: Strategic transportation network models are often used as support tools in the framework of decisions to be taken at the policy level, such as the Trans-European Network projects. These models are mostly setup using aggregated or limited data. If their calibration is regularly mentioned in the literature, their validation is barely discussed. In this paper, several modal choice model specifications that make only use of explanatory variables available at the network level are described and applied to a large scale case. A validation exercise is performed at three levels of aggregation. The paper is designed from a strategic transport planning perspective, and does not present new modal choice formulations or assignment procedures. Its main added value is the focus on calibration and validation considerations. Despite the limited explanatory information used, the global performance of the best models can be considered as satisfactory. However, the quality of the models varies from mode to mode, the use of railway transport being the most difficult to predict without more specific input.
Estimating Elasticities for Freight Transport Using a Network Model: An Applied Methodological Framework  [PDF]
Bart Jourquin
Journal of Transportation Technologies (JTTs) , 2019, DOI: 10.4236/jtts.2019.91001
Abstract: This paper presents a general framework that can be used to estimate direct and cross elasticities for freight transport using a network model. This methodology combines operational research (network assignments in a geographical information system) with more classical econometrics (multinomial logit choice models). The application of the method to a real-world case is illustrated by a simple model that relies on the generalized cost of transport as the only explanatory variable in the utility function. The methodological framework allows, however, for the implementation of more complex functions. Beside the generalized cost functions for road, rail and inland waterways transport, the network model needs origin-destination matrixes and digitized networks. They are imported from ETIS Plus, a European transport policy information system. A set of direct and cross elasticities is presented. The estimated values are obtained using two methods: the first computes standard elasticities, while the second estimates arc elasticities. Figures are presented for Europe and for a large region around the Benelux countries, where more competition exists between the three modes of interest.
Epidemiology of exercise-related injuries among children  [PDF]
Ches Jones, Bart Hammig
Health (Health) , 2012, DOI: 10.4236/health.2012.49098
Abstract: The objective of this study was to describe the epidemiology of injuries from exercise not involving equipment among children 18 and under. Methods included a retrospective review of data for children birth to 18 years old from the National Electronic Injury Surveillance (NEISS) system of the US consumer Product Safety Commission for the years 2005-2009. A total of 5093 cases were identified and would result in an estimated 175,000 injuries in the US. The most common type of injury was a sprain/strain to the ankle (20%). Four out of five injuries were among children between 10 and 18. Injuries occurring at school accounted for 40% of the injuries. Exercise-related injuries are common among older children and often occur in schools or recreational environments but are usually minor. School officials and athletic personnel should make efforts to provide proper instruction on exercise activities and have resources to provide emergency care for injuries.
Getting the Balance Right in Intercultural Groups: A Dynamic Social Network Perspective  [PDF]
Bart Rienties, Novie Johan
Social Networking (SN) , 2014, DOI: 10.4236/sn.2014.33022
Abstract:

Problem: A common assumption is that students prefer to select their friends for group-work. The prime goal of this study was to understand the impact of two group selection methods on how students from diverse cultural backgrounds build learning and work relations. Method: Social Network Analysis in a pre-post test manner in a quasi-experimental design of 81 vs. 70 third-year students. Solution: In this study, we “disrupted” this group selection process after Day 1 by balancing students from different parts of the social network together. In one condition the students were “balanced” into groups by staff to encourage structural hole formation, and in the other condition students were allowed to self-select their group members to encourage network closure. Results: Students in the self-selected condition primarily selected their friends from a similar cultural background. In both conditions the learning networks after 11 weeks were primarily predicted by the group allocation and initial friendships. However, students in the balanced condition developed more cross-cultural learning links. These results indicate that teachers can actively intervene in the cross-cultural dynamics in- and outside the classroom.

What Do Project Managers Actually Do? Exploring Micro-Practices of Managing Temporary Organizational Forms  [PDF]
Bart Cambré, Jeroen de Jong
American Journal of Industrial and Business Management (AJIBM) , 2013, DOI: 10.4236/ajibm.2013.33033
Abstract:

While the management of projects is rapidly gaining importance in the current fast pace economy, there is a growing dissatisfaction with its theoretical underpinnings. Rooted in an exploratory micro-analysis of the practices of 86 project managers, our study demonstrates that project managers engage in 10 core practices, which together imply that managing projects 1) is only partly about planning and scheduling, 2) is locally situated in specific types of projects, 3) is an activity aimed at a continuous recoupling of diverse practices, and 4) is shaped by project contexts, which act as temporary points of intersection for social practice. Together, we propose these practices form a set of building blocks for a practice-perspective of project-based organization, presenting an alternative to the theoretical paradigm currently dominating the field.

Precompactness and total boundedness in products of metric spaces
Bart Windels
International Journal of Mathematics and Mathematical Sciences , 2001, DOI: 10.1155/s016117120100672x
Abstract: We show that the canonical quantifications of uniform propertiessuch as precompactness and total boundedness, which were alreadystudied by Kuratowski and Hausdorff in the setting of completemetric spaces, can be generalized in the setting of products ofmetric spaces in an intuitively appealing way.
Symmetry-Adapted Rotator Functions for Molecules in Cylindrical Confinement
Bart Verberck
International Journal of Molecular Sciences , 2011, DOI: 10.3390/ijms12010317
Abstract: We present a general description of the formalism of symmetry-adapted rotator functions (SARFs) for molecules in cylindrical confinement. Molecules are considered as clusters of interaction centers (ICs), can have any symmetry, and can display different types of ICs. Cylindrical confinement can be realized by encapsulation in a carbon nanotube (CNT). The potential energy of a molecule surrounded by a CNT can be calculated by evaluating a limited number of terms of an expansion into SARFs, which offers a significant reduction of the computation time. Optimal molecular orientations can be deduced from the resulting potential energy landscape. Examples, including the case of a molecule with cubic symmetry inside a CNT, are discussed.
Symmetry-Adapted Fourier Series for the Wallpaper Groups
Bart Verberck
Symmetry , 2012, DOI: 10.3390/sym4030379
Abstract: Two-dimensional (2D) functions with wallpaper group symmetry can be written as Fourier series displaying both translational and point-group symmetry. We elaborate the symmetry-adapted Fourier series for each of the 17 wallpaper groups. The symmetry manifests itself through constraints on and relations between the Fourier coefficients. Visualising the equivalencies of Fourier coefficients by means of discrete 2D maps reveals how direct-space symmetry is transformed into coefficient-space symmetry. Explicit expressions are given for the Fourier series and Fourier coefficient maps of both real and complex functions, readily applicable to the description of the properties of 2D materials like graphene or boron-nitride.
Identification of ambiguities in the 1994 chronic fatigue syndrome research case definition and recommendations for resolution
Bart Stouten
BMC Health Services Research , 2005, DOI: 10.1186/1472-6963-5-37
Abstract: We derived an expression that allows us to compute a lower bound for the number of items with the maximum item score for a given study from the reported mean scale score, the number of reported subjects, and the properties of the fatigue rating scale. Several CFS studies that used the recommended fatigue rating scales were selected from literature and analyzed to verify whether abundant extreme scoring had occurred.Extreme scoring occurred on a large number of the items for all three recommended fatigue rating scales across several studies. The percentage of items with the maximum score exceeded 40% in several cases. The amount of extreme scoring for a certain scale varied from one study to another, which suggests heterogeneity in the selected subjects across studies.Because all three instruments easily reach the extreme ends of their scales on a large number of the individual items, they do not accurately represent the severe fatigue that is characteristic for CFS. This should lead to serious questions about the validity and suitability of the Checklist Individual Strength, the Chalder Fatigue Scale, and the Krupp Fatigue Severity Scale for evaluating fatigue in CFS research.Since ambiguities in the 1994 chronic fatigue syndrome (CFS) research case definition [1] do indeed contribute to inconsistenties in the identification of cases, I welcome the publication by Reeves et al. [2] and the authors' efforts to resolve these problems. However, I have to express my deepest concerns about the three instruments that the authors have recommend for measuring fatigue in research studies on CFS. Because all three instruments easily reach the extreme ends of their scales on a large number of the individual items, they do not accurately represent the severe fatigue that is required to satisfy any of the published CFS research case definitions [1,3-5]. This low ceiling effect seriously distorts the fatigue measurements, which will inevitably result in bias and potentially mislea
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