Pereira, Colombia

Catholic University of Pereira

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Pereira, Colombia

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Cardona J.F.,University of Buenos Aires | Cardona J.F.,CONICET | Cardona J.F.,Catholic University of Pereira | Kargieman L.,University of Buenos Aires | And 23 more authors.
Cognition | Year: 2014

Although motor-language coupling is now being extensively studied, its underlying mechanisms are not fully understood. In this sense, a crucial opposition has emerged between the non-representational and the representational views of embodiment. The former posits that action language is grounded on the non-brain motor system directly engaged by musculoskeletal activity - i.e., peripheral involvement of ongoing actions. Conversely, the latter proposes that such grounding is afforded by the brain's motor system - i.e., activation of neural areas representing motor action. We addressed this controversy through the action-sentence compatibility effect (ACE) paradigm, which induces a contextual coupling of motor actions and verbal processing. ACEs were measured in three patient groups - early Parkinson's disease (EPD), neuromyelitis optica (NMO), and acute transverse myelitis (ATM) patients - as well as their respective healthy controls. NMO and ATM constitute models of injury to non-brain motor areas and the peripheral motor system, whereas EPD provides a model of brain motor system impairment. In our study, EPD patients exhibited impaired ACE and verbal processing relative to healthy participants, NMO, and ATM patients. These results indicate that the processing of action-related words is mainly subserved by a cortico-subcortical motor network system, thus supporting a brain-based embodied view on action language. More generally, our findings are consistent with contemporary perspectives for which action/verb processing depends on distributed brain networks supporting context-sensitive motor-language coupling. © 2014 Elsevier B.V.


Becerra L.,Catholic University of Pereira | Padilla J.,Pontifical Bolivarian University | Paradells J.,Polytechnic University of Catalonia
IEEE Latin America Transactions | Year: 2011

Our approach called HMIPv6-BI proposes a modification to the Hierarchical Mobile IPv6 protocol in order to reduce the use of bandwidth in the radio link between AR and MN. HMIPv6 establishing a tunnel between MAP and MN, which leads to tunnel headers traveling by air interface, leading to greater use of the channel. With HMIPv6-BI improves the situation. In addition to significantly reducing the bandwidth of the radio channel, HMIPv6-BI allows the use of multicast tunnels to reduce the handover latency. The HMIPv6-BI analysis shows favorable results, when is compared with the standard approach. These results are compared with NS-2 simulations. © 2005 IEEE.


Arias D.F.,Catholic University of Pereira | Gomez A.,University of Sao Paulo | Gomez A.,Pontifical Xavierian University | Velez J.M.,National University of Colombia | And 2 more authors.
Materials Chemistry and Physics | Year: 2015

Multilayer Cr/CrN coatings with different periodicities were grown on silicon substrates by means of a magnetron sputtering technique. Thin films with only Cr or CrN were also grown, in order to use them as reference samples. Structural, morphological, mechanical and tribological characterization were carried out by using X-ray diffraction (XRD), atomic force microscopy (AFM), nanohardness and nanoscratch techniques, respectively. The characterization results were analyzed as a function of the bilayer thickness (period). In general, the multilayer hardness value increased with the decrease in period. In addition, the validity of the Hall-Petch relationship was confirmed for grain sizes and period values greater than 146 nm and 333 nm, respectively. The coefficient of friction (COF) increased with increasing load, which indicates the contribution of the adhesion to the COF. © 2015 Elsevier B.V.


Amaya-Roncancio S.,National University of Colombia | Amaya-Roncancio S.,Catholic University of Pereira | Arias-Mateus D.F.,Catholic University of Pereira | Gomez-Hermida M.M.,Catholic University of Pereira | And 2 more authors.
Applied Surface Science | Year: 2012

Three-dimensional molecular dynamics (MD) simulations of nanoindentation technique was carried out for Cr and CrN thin films that present BCC and FCC crystalline structures respectively. Structures were oriented in the plane (1 0 0) and placed on silicon substrates. A pair wise potential was employed for simulating the interaction between atoms of each layer and a repulsive radial potential was used for representing a spherical tip indenting the sample. Mechanical properties of these two materials were obtained varying the temperature from 300 K to 1000 K with steps of 100 K. The hardness and elastic parameters were found for each temperature, showing a better mechanical response for films at low temperature. Structural changes evolution was observed presenting vacancies and slips as the temperature was increased. A temperature smoothing occurred because of the long range of slips and vacancies propagation. Then, the interatomic force decreases as the kinetic energy of the particles involved in nanoindentation process increases. © 2011 Elsevier B.V. All rights reserved.


Objective: The objective of this study was to identify the usage and accessibility problems faced by the disabled (whether in pain or not) users of assistive devices (conventional wheelchairs), identify physical barriers that limit their mobility, and recognize the socio-cultural practices excluding them from the design process of such devices. Another main purpose of this paper is to improve the ergonomic criteria that influence the design and manufacture of assistive devices. Materials and method: Study population: 15 patients with any of the following diagnoses: ankylosing spondylitis, rheumatoid arthritis, or amputees using wheelchairs in Mexico and Colombia. Design: Qualitative study. Thematic analysis with a theoretical industrial design approach to employing usability testing for ergonomic analysis. Results: We identified 6 issues associated with usability problems from the patient's standpoint: barriers for use of wheelchairs (usability and acceptability), creative adaptations, potential use of technical devices, independence, body perception and assistive devices, and architectural barriers. The ergonomic and usability requirements and the resulting level of independence vary across wheelchair users with chronic pain and those whose disability does not involve pain. The latter are more independent in their movements and decisions. Conclusions: User input is essential in the design of assistive devices. The proposal of " design from and for the user" must rely on both engineering and medical perspective on the ergonomy as well as the user interpretation of the environment and the experience of the disease. Thus we can arrive at a " user-centered design" © 2012 Elsevier España, S.L.


Padilla J.,Pontifical Bolivarian University | Santamaria L.,Pontifical Bolivarian University | Acevedo C.,Pontifical Bolivarian University | Becerra L.,Catholic University of Pereira
LANC 2011 - Proceedings of the 6th Latin America Networking Conference | Year: 2011

In this paper, we describe a new hardware tool to test new Quality of Service proposals. Thus, we want to reduce the digital divide between Latin America development countries. The problem is that in our region it is difficult to build hardware prototypes for new networking protocols and methods. Our tool, named U2-Route, is based on a NetFPGA board, an open source hardware system developed in Stanford University. U2-Route has a routing core and a Web Interface that allows research groups belonging to Universities to test new developments. As an example, we show the methodology to design and to implement a Classifier and the results obtained. © 2011 ACM.


Sanchez L.Y.B.,Catholic University of Pereira | Aguilar J.J.P.,Pontifical Bolivarian University
IEEE Latin America Transactions | Year: 2014

One of the radical changes that have occurred in current IP networks has been the migration from IPv4 to IPv6. One of the most important aspects of the IPv6 protocol is the fact that allows the labeling of packets belonging to a particular flow in order to give proper treatment by routers, for such purpose, the "Flow Label" field was originally created. However, this field has not been exploited yet and it has even been shelved due to the rise of other technologies such as MPLS. With the rise of IPv6 world implementation, it is essential to know the requirements of the use of this field to exploit the functions for which it was created. This article describes the IPv6 flow label field evolution, specifications and recommendations published by the IETF to use it; also here, some approaches are described, which have been proposed so far using the Label Flow for different purposes. © 2014 IEEE.


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La seccin a la que intentas acceder se est migrando desde el antiguo portal, intntalo ms tarde


Catholic University of Pereira | Entity website

La Universidad, consciente de su misin que consiste en ser apoyo en la formacin de personas que en su que-hacer diario muestren lo que significa ser gente, gente de bien y profesionalmente capaz", ha querido asumir una perspectiva en la educacin que permita atender a las personas en todos los aspectos de lo que se puede denominar una formacin integral. El bienestar no slo est en relacin con las facilidades y comodidades fsicas, se comprende en relacin con el ser, en el marco de una propuesta que invita al servicio como categora importante para la inclusin y la equidad de los menos favorecidos, discriminados y potencial y activamente violentados ...


Catholic University of Pereira | Entity website

Visita a las Instituciones Educativas: Se propician espacios de reflexin acadmica en las Instituciones Educativas con los docentes para que a travs de la Didctica de la ERE y los insumos que se les brinda en el Taller del Maestro, ellos logren construir y orientar la asignatura de la Educacin Religiosa como dimensin indispensable en la realizacin de sus estudiantes. Asesora personalizada: Se pretende despertar en los docentes que no tienen una formacin idnea en el rea de Educacin Religiosa el inters por la dimensin religiosa y el acercamiento a la relacin con Dios, mediante el uso de herramientas, recursos pedaggicos y prcticos que se les brinda en el Taller del Maestro para que por medio de ellos puedan experimentar las verdades sobre lo religioso como dimensin insustituible del ser humano ...

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