Symmetric Interconnection Networks from Cubic Crystal Lattices

Torus networks of moderate degree have been widely used in the supercomputer industry. Tori are superb when used for executing applications that require near-neighbor communications. Nevertheless, they are not so good when dealing with global communications. Hence, typical 3D implementations have evolved to 5D networks, among other reasons, to reduce network distances. Most of these big systems are mixed-radix tori which are not the best option for minimizing distances and efficiently using network resources. This paper is focused on improving the topological properties of these networks. By using integral matrices to deal with Cayley graphs over Abelian groups, we have been able to propose and analyze a family of high-dimensional grid-based interconnection networks. As they are built over $n$-dimensional grids that induce a regular tiling of the space, these topologies have been denoted \textsl{lattice graphs}. We will focus on cubic crystal lattices for modeling symmetric 3D networks. Other higher dimensional networks can be composed over these graphs, as illustrated in this research. Easy network partitioning can also take advantage of this network composition operation. Minimal routing algorithms are also provided for these new topologies. Finally, some practical issues such as implementability and preliminary performance evaluations have been addressed

Classes of Symmetric Cayley Graphs over Finite Abelian Groups of Degrees 4 and 6

The present work is devoted to characterize the family of symmetric undirected Cayley graphs over finite Abelian groups for degrees 4 and 6.Comment: 12 pages. A previous version of some of the results in this paper where first announced at 2010 International Workshop on Optimal Interconnection Networks (IWONT 2010). It is accessible at http://upcommons.upc.edu/revistes/handle/2099/1037

Improving the Quality of Teaching Internships with the Help of the Platforms

This article presents an empirical study on the perceptions of university students toward the development of the teaching practicum, using the CourseSites platform as a communication and support tool for their training. The opinions of the students were collected through a questionnaire. The sample consisted of 1500 students who were registered in the degrees of Early Childhood Education, Primary Education and Pedagogy (2008-2018). A descriptive, inferential and multi-level analysis was conducted, which confirmed that future teachers had activated their professional competences, as they had the chance to share their internship experiences with their faculty members and with their own classmates

Alternative Lines of Action for the Design of Online Multimedia Material Directed towards the Collaborative Training of Teachers in the Design of the Teaching

The aim of the study was to evaluate the potential for online multimedia materials as alternative learning tools for the collaborative training of teachers in the design of research-based teaching. A case study using a team of three trainee teachers was used to develop a process of initial training in the design of a constructivist and research-based teaching unit supported by online multimedia material. The results obtained from the research allowed some principles to be identified, and basic recommendations and alternative lines of action to be given for designing online multimedia materials. Online multimedia materials can be alternative teaching tools that contribute (with other materials) to the development of constructivist, collaborative and research-based strategies which help provide the necessary support for improving the initial and ongoing training of new teachers in the design of teaching from a research perspectiv

Values of the Parents of Pupils with Special Educational Needs due to Sociocultural Background

The aim of the study was to investigate the values behind the nature and behaviour of parents with children who have Special Educational Needs, and the way they approach their children´s schooling. The views of two hundred and sixty-eight parents living in a socially and culturally disadvantaged area, were evaluated using the Hall-Tonna Inventory of Values. The results showed that there are differences in the parents’ hierarchy of values according to whether the school they have chosen for their children is inside or outside the area. The principle differences are in the content of some of the priority values selected by each group, and/or in the priority that each group gives to some of the values common to both groups. The implications of how the parents prioritise the values are discussed with regard to their own personal development and the education of their children

Sterculiaceae

Árboles, arbustos o subarbustos, raro lianas o hierbas con pelos ramificados de dos o pocos brazos. Hojas estipuladas, alternas, generalmente pecioladas, simples, enteras, crenadas o aserradas. Flores monoclinas o diclinas, homostilas o heterostilas, actinomorfas o pseudozigomorfas, reunidas en cimas breves axilares o terminales. Sépalos 5, prefloración valvar, soldados o connados en la base. Pétalos 5, planos o con una larga uña cuculada adosada al tubo estaminal, en este caso lámina simple o bífida, a veces más pequeña que la uña. Androginóforo a veces presente, corto o sobrepasando la corola. Estambres 5-15, oposipétalos, libres o soldados formando un tubo; anteras 2-3-tecas, paralelas o divergentes; estaminodios 0-5. Ovario (1-) 5-carpelar, súpero, carpelos 1-∞-ovulados, placentación axilar; estilos 1-5, libres o soldados; estigmas aguzados, capitados plumosos o penicilados. Fruto cápsula, cocos dehiscentes o indehiscentes. Semillas lisas o rugosas, con o sin endosperma, cotiledones planos, a menudo replegados y enrollados alrededor del eje hipocotilar. Unos 67 géneros y cerca de 1100 especies de regiones tropicales y subtropicales de todo el mundo. En la Argentina 6 géneros con 41 especies (Cristóbal, 1999: 1114). En Salta hay 5 de ellos. Solamente el género Guazuma Mill. se halla en el nordeste y no llega a nuestra provincia. En el valle de Lerma 3 géneros con 6 especies, todas ellas indígenas