Applets en Geometría.

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Usando applets para construir el concepto de integral definida.

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La enseñanza de la metodología experimental con apoyo en la tele-educación : a) Uso de páginas web y plataformas de educación a distancia como recursos de apoyo, b) Experimentos psicológicos a través de Internet, c) Elaboración de un libro de texto de Metodología Experimental base para el proyecto.

Realizado en la Facultad de Psicología de Salamanca, por 3 profesores del centro para la asignatura de Metodología Experimental de la Licenciatura en Psicología. Se confeccionó un libro de texto para la asignatura mencionada y materiales escritos asociados a la existencia de la plataforma de enseñanza virtual. También, se desarrolló un curso de apoyo a la docencia de la citada asignatura basado en una plataforma interactiva y applets en lenguaje Java que permiten la realización de experiencias interactivas sobre temas psicológicos. El resultado del proyecto ha sido satisfactorio y puede ser de utilidad para otras titulaciones de Ciencias de la Educación las cuales aplican métodos experimentales.

Desarrollo de un laboratorio virtual en internet como apoyo a las prácticas de Física.

Se han desarrollado en la Escuela Técnica Superior de Ingeniería Informática (ETS II)y en la Escuela Universitaria Politécnica (EUP) de la Universidad de VAlladolid (UVA) un conjunto de herramientas y programas informáticas para facilitar la enseñanza de la Física y potencar la eficacia de las prácticas de laboratorio. En concreto se han desarrollado cinco prácticas virtuales accesibles a través de internet. Cada una esta formada por diversas página web y simulaciones en JAVA además se han creado dos páginas web complejas incluyendo APPLEts de JAVA para explicar con ejemplos dos temas completos de teoría. Tercero,se han incluido en estas páginas web también dos programas de simulación para que los alumnos los utilizen para estudiar los fenómenos físicos representados por ellos. Finalmente, también se han grabado dos películas de vídeo en las que profesores participantes en el proyecto explican mediante ejemplos y experimentos algunos fenómenos físicos. Los materiales utilizados han sido, obviamente, diversos ordenadores y editores de páginas web, así como una cámara de vídeo y programas de tratamiento de imágenes. Los resultados se comunicarán en un Congreso Internacional y un Artículo (aún sin publicar).

Aproximación al concepto de función primitiva : un experimento de enseñanza con applets de geometría dinámica.

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La Ingeniería Lingüística con Java.

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Los laboratorios de matemáticas en Internet en la formación permanente del profesorado de matemáticas.

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MPJ express: Towards thread safe Java HPC

MPJ Express is a thread-safe Java messaging library that provides a full implementation of the mpiJava 1.2 API specification. This specification defines a MPI-like bindings for the Java language. We have implemented two communication devices as part of our library, the first, called niodev is based on the Java New I/O package and the second, called mxdev is based on the Myrinet eXpress library MPJ Express comes with an experimental runtitne, which allows portable bootstrapping of Java Virtual Machines across a cluster or network of computers. In this paper we describe the implementation of MPJ Express. Also, we present a performance comparison against various other C and Java messaging systems. A beta version of MPJ Express was released in September 2005.

Parallel and distributed computing with Java

The Java language first came to public attention in 1995. Within a year, it was being speculated that Java may be a good language for parallel and distributed computing. Its core features, including being objected oriented and platform independence, as well as having built-in network support and threads, has encouraged this view. Today, Java is being used in almost every type of computer-based system, ranging from sensor networks to high performance computing platforms, and from enterprise applications through to complex research-based.simulations. In this paper the key features that make Java a good language for parallel and distributed computing are first discussed. Two Java-based middleware systems, namely MPJ Express, an MPI-like Java messaging system, and Tycho, a wide-area asynchronous messaging framework with an integrated virtual registry are then discussed. The paper concludes by highlighting the advantages of using Java as middleware to support distributed applications.

MPJ express meets gadget: towards a java code for cosmological simulations

Gadget-2 is a massively parallel structure formation code for cosmological simulations. In this paper, we present a Java version of Gadget-2. We evaluated the performance of the Java version by running colliding galaxies simulation and found that it can achieve around 70% of C Gadget-2's performance.

A buffering layer to support derived types and proprietary networks for Java HPC

MPJ Express is our implementation of MPI-like bindings for Java. In this paper we discuss our intermediate buffering layer that makes use of the so-called direct byte buffers introduced in the Java New I/O package. The purpose of this layer is to support the implementation of derived datatypes. MPJ Express is the first Java messaging library that implements this feature using pure Java. In addition, this buffering layer allows efficient implementation of communication devices based on proprietary networks such as Myrinet. In this paper we evaluate the performance of our buffering layer and demonstrate the usefulness of direct byte buffers. Also, we evaluate the performance of MPJ Express against other messaging systems using Myrinet and show that our buffering layer has made it possible to avoid the overheads suffered by other Java systems such as mpiJava that relies on the Java Native Interface.

A buffering layer to support derived types and proprietary networks for Java HPC

MPJ Express is our implementation of MPI-like bindings for Java. In this paper we discuss our intermediate buffering layer that makes use of the so-called direct byte buffers introduced in the Java New I/O package. The purpose of this layer is to support the implementation of derived datatypes. MPJ Express is the first Java messaging library that implements this feature using pure Java. In addition, this buffering layer allows efficient implementation of communication devices based on proprietary networks such as Myrinet. In this paper we evaluate the performance of our buffering layer and demonstrate the usefulness of direct byte buffers. Also, we evaluate the performance of MPJ Express against other messaging systems using Myrinet and show that our buffering layer has made it possible to avoid the overheads suffered by other Java systems such as mpiJava that relies on the Java Native Interface.

Nested parallelism for multi-core HPC systems using Java

Since its introduction in 1993, the Message Passing Interface (MPI) has become a de facto standard for writing High Performance Computing (HPC) applications on clusters and Massively Parallel Processors (MPPs). The recent emergence of multi-core processor systems presents a new challenge for established parallel programming paradigms, including those based on MPI. This paper presents a new Java messaging system called MPJ Express. Using this system, we exploit multiple levels of parallelism - messaging and threading - to improve application performance on multi-core processors. We refer to our approach as nested parallelism. This MPI-like Java library can support nested parallelism by using Java or Java OpenMP (JOMP) threads within an MPJ Express process. Practicality of this approach is assessed by porting to Java a massively parallel structure formation code from Cosmology called Gadget-2. We introduce nested parallelism in the Java version of the simulation code and report good speed-ups. To the best of our knowledge it is the first time this kind of hybrid parallelism is demonstrated in a high performance Java application. (C) 2009 Elsevier Inc. All rights reserved.

A comparative study of Java and C performance in two large-scale parallel applications

In the 1990s the Message Passing Interface Forum defined MPI bindings for Fortran, C, and C++. With the success of MPI these relatively conservative languages have continued to dominate in the parallel computing community. There are compelling arguments in favour of more modern languages like Java. These include portability, better runtime error checking, modularity, and multi-threading. But these arguments have not converted many HPC programmers, perhaps due to the scarcity of full-scale scientific Java codes, and the lack of evidence for performance competitive with C or Fortran. This paper tries to redress this situation by porting two scientific applications to Java. Both of these applications are parallelized using our thread-safe Java messaging system—MPJ Express. The first application is the Gadget-2 code, which is a massively parallel structure formation code for cosmological simulations. The second application uses the finite-domain time-difference method for simulations in the area of computational electromagnetics. We evaluate and compare the performance of the Java and C versions of these two scientific applications, and demonstrate that the Java codes can achieve performance comparable with legacy applications written in conventional HPC languages. Copyright © 2009 John Wiley & Sons, Ltd.