Saint-Barthelemy-de-Vals, France

Catholic School of Engineering
Saint-Barthelemy-de-Vals, France
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Ramirez-Correa P.E.,Catholic School of Engineering | Rondan-Cataluna F.J.,University of Seville | Arenas-Gaitan J.,University of Seville | Alfaro-Perez J.L.,Catholic School of Engineering
Telematics and Informatics | Year: 2017

This study uses the DeLone and McLean model to determine the moderating impact of learning styles on the success of learning management systems from a student's point of view. The main objectives of this research are: (1) to evaluate the Delone and McLean model of information system success in the context of learning management systems and, (2) to determine the effect of the learning styles of students on this model. An in-person survey of 258 engineering students was used to evaluate the research model. The analysis is based on structural equation modelling, specifically partial least squares. The results indicate that the research model explains use, user satisfaction, and perceived benefits of a learning management system. In addition, the Felder-Silverman learning styles (sensing-intuitive, visual-verbal; active-reflective; sequential-global) modify the strength of the relationships between the variables of the success model. © 2016 Elsevier Ltd. All rights reserved.

Arenas-Gaitan J.,University of Seville | Rondan-Cataluna F.J.,University of Seville | Ramirez-Correa P.E.,Catholic School of Engineering
Interactive Learning Environments | Year: 2017

There is not a unique attitude towards the implementation of digital technology in educational sceneries. This paper aims to validate an adaptation of the DeLone and McLean information systems success model in the context of a learning management system. Furthermore, this study means to prove (1) the necessity of segmenting students in order to fit the model more accurately and (2) the impact of other new Internet tools on students’ perceptions with regard to learning management systems. Partial least squares has been used to analyse the measurement and the structural model. Subsequently, the Finite Mixture Partial Least Squarestechnique has been employed to examine unobserved heterogeneity and to find users’ segments. The results of this research indicate that to segment between two groups of students is especially useful in order to improve the understanding of the success of a learning management system. This segmentation is made according to the importance which the students attribute to the new Internet tools to support their learning. © 2017 Informa UK Limited, trading as Taylor & Francis Group

Resquin F.,Catholic School of Engineering | Guevara J.,Catholic School of Engineering | Cardozo C.,Catholic School of Engineering | Santacruz C.,Catholic School of Engineering | And 2 more authors.
Proceedings - 8th IEEE International Conference on Mobile Ad-hoc and Sensor Systems, MASS 2011 | Year: 2011

Environmental monitoring is one of the most classic applications of Wireless Sensor Networks (WSN). Itaipu hydroelectric dam creates a unique scenario for the development of this type of WSN with more than 200 square kilometers of natural forests. In this context, FLORA project is aimed at developing a habitat monitoring WSN to be deployed in the Zoo of Itaipu and in the Tati Yupi Biological Refuge. The deployment includes more that 50 nodes. The paper describes the two scenarios of this ambitious and challenging application and presents the routing and topology control protocol developed in the framework of FLORA. The protocol was designed to fulfil the requirements of the application, extend the lifetime of the network, and to adapt to continuous nodes deployment and potential failures. It is based in several protocols already reported in the literature. The novel proposal is a reliable and lightweight routing protocol for wireless sensor network based on vector distance, collection tree, and energy aware distance vector protocols. The main idea is that each node of the network finds the shortest path to the sink with the best link quality in order to guarantee the delivery of data to the sink despite the dynamic and lossy nature of wireless transmissions. The functionality of this novel protocol is presented as well as the results based on a TinyOS implementation and traditional WSN nodes (motes) including a CC2420 radio. © 2011 IEEE.

Park J.-H.,Catholic School of Engineering
Theoretical Computer Science | Year: 2016

Given two disjoint vertex-sets, S=(s1,...,sk) and T=(t1,...,tk) in a graph, a paired many-to-many k-disjoint path cover between S and T is a set of pairwise vertex-disjoint paths (P1,...,Pk) that altogether cover every vertex of the graph, in which each path Pi runs from si to ti. A family of hypercube-like interconnection networks, called restricted hypercube-like graphs, includes most non-bipartite hypercube-like networks found in the literature, such as twisted cubes, crossed cubes, Möbius cubes, recursive circulant G(2m,4) of odd m, etc. In this paper, we show that every m-dimensional restricted hypercube-like graph, m≥5, with at most f vertex and/or edge faults being removed has a paired many-to-many k-disjoint path cover between arbitrary disjoint sets S and T of size k each, subject to k≥2 and f+2k≤m+1. The bound m+1 on f+2k is the best possible. © 2016.

Checot-Moinard D.,Catholic School of Engineering | Rigollet C.,Catholic School of Engineering | Lourdin P.,Catholic School of Engineering
Powder Technology | Year: 2011

Small and complex-shaped parts can be manufactured with powder injection moulding PIM process at a low cost in comparison to other traditional powder technologies. A variant of PIM process denoted as micropowder injection moulding (μ-PIM) has been recently developed in order to manufacture components having sub-millimeter dimensions or micrometer range structural details. PIM and μ-PIM are used for numerous applications in the field of electronics, defence and aerospace, medical industry. This contribution displays preliminary study on the feasibility to manufacture parts having micro-details by powder injection moulding from partially water soluble self-made feedstock. All process steps are investigated from feedstock preparation to sintering. © 2010 Elsevier B.V.

Rigollet C.,Catholic School of Engineering | Checot-Moinard D.,Catholic School of Engineering | Checot-Moinard D.,Arts et Metiers ParisTech | Lourdin P.,Catholic School of Engineering
Proceedings of the Euro International Powder Metallurgy Congress and Exhibition, Euro PM 2011 | Year: 2011

Powder Injection Moulding PIM process is based on injection of mixtures defined as "feedstocks" made of polymeric binder and metallic or ceramic powder. Feedstock viscosities are key parameter to control the injection step having strong impact on final parts in particular regarding complex parts with small structural details. On the same manner, thermal conductivity is a crucial feedstock property. Nevertheless, besides numerous studies on feedstocks, only a few experimental works have addressed their thermal conductivity at temperature and pressure close to those encountered in the injection moulding process. However, these data are searched for in order to perform numerical simulation of PIM process. In this contribution, we study thermal conductivity and viscosity of some commercial and self-made feedstocks. The influence on thermal conductivity and viscosity of parameters such as the solid loading, the powder size and chemical nature is highlighted.

Ortega M.A.,ITA Technology Institute of Aeronautics | Girardi R.M.,ITA Technology Institute of Aeronautics | Silvestrini J.H.,Catholic School of Engineering
International Journal for Numerical Methods in Fluids | Year: 2012

This project focuses on the wake behind a two-dimensional blunt-trailing-edged body. The body has an elliptical nose followed by a straight section that ends in a blunt base. For this geometry, the boundary layer separation points are defined and fixed. This permits a better assessment of the vital influence of the boundary layers upon the wake. It is hoped that the study of this special geometry will contribute to a better understanding of the wake flow. The main aim of this article is to study the topology of the wake by means of direct numerical simulation (DNS). The idea is to mimic some experimental work techniques. In an experiment, by means of proper synchronization, one is able to arrive at the mean-in-the-phase fields. In the present work, similar data are obtained through the use of numerical tools. The topology of the wake flow in terms of the movement of the coherent structures, fields of Reynolds stresses, position of saddles and centers, is obtained for certain values of the body's aspect ratio. A comparison with the circular cylinder experimental data is also provided. An important result is the finding of some specific stress distributions around the main structures. The stress level lines are a hint of where the energy transfer of the mean flow to the turbulence is more intense. © 2011 John Wiley & Sons, Ltd.

Putranto A.,Catholic School of Engineering | Chen X.D.,Jiangsu University
AIChE Journal | Year: 2016

Drying is a very important industrial operation in society. In drying, solute may dissolve in an aqueous solvent, a nonaqueous solvent or a mixture of solvents. Many mathematical models have been published previously to model drying of solute in water. The reaction engineering approach (REA) is known to be an easy-to-use approach. It can describe well many drying cases of water removal. Currently, no simple lumped model has been attempted to describe drying of porous materials containing a mixture of solvents. In this study, for the first time, REA is constructively implemented to model drying in a mixture of one aqueous and one nonaqueous solvent. The REA is applied here to model the drying of polyvinyl alcohol/methanol/water under constant and time-varying environmental conditions. Similar to the relative activation energy of water, that of methanol is generated through one accurate drying run. For modeling the time-varying drying, the relative activation energies are the same as those for modeling convective drying under constant ambient conditions but combined with the equilibrium activation energies at the corresponding humidity, methanol concentration, and temperature for each drying period. The REA is accurate to model drying of a solute in nonaqueous solvent as well as in a mixture of noninteracting solvents. In the future, spatially distributed REA for nonaqueous or mixtures of both aqueous and nonaqueous solvent will be explored for fundamental understanding and for practical application. © 2016 American Institute of Chemical Engineers.

PubMed | Catholic School of Engineering, Catholic University of Daegu and Convergent
Type: Journal Article | Journal: Journal of physical therapy science | Year: 2016

[Purpose] The purpose of the current study was to examine age-related differences in control of a perception-action coordination skill. We adapted a visuomotor tracking experiment requiring various coordination patterns between a limbs motion and an external signal. [Subjects and Methods] A total of 12 subjects (6 elderly and 6 young) voluntarily participated in the study. The experimental session consisted of 3 trials for 3 different relative phase patterns: 0, 90, and 180, defined by the relationship between the online visual feedback of the joystick motion and the white dot signal. [Results] The 0 and 180 tracking patterns were stable compared with the 90 tracking pattern for both age groups. The present results also showed that the elderly subjects were less stable than were young subjects for all tracking patterns. [Conclusion] The intrinsic coordination dynamics predicted by the Haken-Kelso-Bunz (HKB) mathematical model did not change with age, whereas utilization of visual feedback information declined overall. Further research is needed regarding methods for increasing utilization of visual feedback information from the perspective of rehabilitation.

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