The paper describes the design and implementation of a semantic web service that retrieves theses and extends the keyword based-search of a DSpace repository taking into account the roles of advisors and steering committee members formally represented into a custom-made ontology. The service uses SPARQL queries and the serialization module of RDF DSpace, this links the item submission process and the ontology, thus the more theses are added into a repository, the more instances are inserted into the ontology. The paper provides empirical insights about how to reuse theses metadata and includes the results of an exploratory and self-management survey of usability heuristic evaluation of a web site that enables to access the proposed service. Heuristics were estimated with a purposive sample of students, teachers, and managers, the results indicated a high satisfaction level and showed that the service increased theses accessibility in the web environment. The service also generates semantically enriched datasets that coexist with the repository, they are of utility and value to educational organizations as they give institutional visibility. INDEX TERMS Educational technology, semantic web, web services, information retrieval.
In this paper the tool DSL (SDA: Sistema Didáctico de Aprendizaje, by its acronym in Spanish) is presented. This tool was designed for the Multiple Attention Center located at Santa Ana Xalmimilulco, Huejotzingo, Puebla, with the aim to help in the in the educative process, as didactic auxiliary in the cognitive process corresponding to the subjects of math and Spanish in the center by means of automation. The main aim is the production of an educational software, focused to didactic of basic cognitive functions. This skills and abilities it is develop in an environment of special education and taking as a base the specialized bibliography of the own Multiple Attention Center. The system was done in C#, taking in advantage the object oriented programming and the interface of the environment of development. Moreover the software it was developed by means of the prototypes paradigm, using Unified Modelling Language, UML, which is a graphic language to visualize, specify, build and document a system, backed up by the OMG (object Management Group). It offer a standard in order to describe a “plane” of the system (model),including the conceptual aspects such as business process and functions of the system, and concrete aspects as expressions of programming languages, data base schemas and reusable components. The results obtained as product of the development of this system was valued by the CAM’s personal. The system developed it is found currently operating in the installations of the center. It is a software with adequate characteristics to the environment, flexible, usable and verifiable that complies with the characteristics of an educational software fully. In future works it is could achieve the realization of software packages portables to other platforms and adaptable to run into web.
A numerical simulation of unsteady plumes for driven thermal high convection dominated flows is presented in this work. The problem is of practical interest for example in the cooling of electronic devices and heat transfer from pipes in heat exchange systems. This kind of thermal flows may be modeled using the unsteady Boussinesq approximation in the Stream function-vorticity formulation. Results are obtained with a simple numerical method previously reported for isothermal/natural and mixed convection flows. The numerical method is based on a fixed point iterative process to solve the non-linear elliptic system that results after an appropriate discretization in time. The iterative process leads us to the solution of uncoupled, well-conditioned and symmetric linear elliptic problems for which very efficient solvers are known to exist regardless of the space discretization.
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