This work presents a stochastic simulation model and experimentation for a toll system developed for a highly concurred highway toll in Venezuela, followed by a discussion of performance and economic indicators. Although mathematical models for resource problems have been developed, their use is not widespread, particularly in developing countries were toll systems are manually operated. The main objective of TollSim is to start building an infrastructure and infostructure to be used in a decision support system for management of traffic related issues in a technologically excluded region. The model was developed using an object‐oriented approach and implemented in MODSIM‐III, SIMGRAPHICSII and SIMDRAW.
Up to now, a pulsed plasma with pulse rates between 50 and 150 kHz has been used in PVD techniques only rarely. Recently, our activities and the efforts of various other research teams were concentrated on this field. The MF‐pulsed plasma offers facility to overcome limitations that restrict the use of DC and RF sputtering. A high motivation for further development results from the objective to coat large areas, to attain the highest possible deposition rates and to carry out a considerate plasma‐assisted surface treatment or plasma coating matched to the compatibility of the substrates. Via pulsed sputtering and plasma‐activated deposition, the application of a pulsed plasma goes from tasks of substrate pretreatment and etching to the plasma‐assisted surface treatment of layers or workpieces. Unipolar pulsed electrodes — in particular floating‐powered multi‐electrode arrangements — pave the way to stable long‐term and arc‐free reactive deposition of defect‐free and electrically insulating layers. The pulsed plasma also opens up fresh ground in the use of bias effects for the deposition of poorly conducting layers and for the coating of thin insulating substrates on an industrial scale.
Collaboration is a learning strategy used in various domains such as e-health, e-business, eeducation, e-government and e-research. In e-learning and under a constructivist approach, collaboration is expected to increase the performance of students. Although it can be used without digital media, given the pervasiveness of technology, their systematic application by educational institutions as instructional tools is nowadays common. In this work, we present our anecdotal experience to introduce collaborative learning at one of the main universities in Venezuela and analyze the results in terms of how students perceived what they learned, how they apprehended collaborative work and we describe a set of collaborative learning strategies with digital media and independent interaction tools that were chosen in this experience by students and teachers. These results will be used for improving the programs and courses in informatics aimed at preparing educators with a profile taking into account ICT's.
In this work we discuss the development of a web application in the domain of movie chains using a Blackboard architecture, which is a well-established style for solving the problem of control, communication and collaboration in a system; it has traditionally been accepted as adequate for heuristic problem solving though not generally used for web applications. We present and discuss how the Blackboard architecture is used as the style for a graduate course project in Software Engineering. Issues about the implementation of the architecture are described and an assessment using some software metrics is presented.
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