Uma plataforma de integração de middleware para computação ubíqua

One of the current challenges of Ubiquitous Computing is the development of complex applications, those are more than simple alarms triggered by sensors or simple systems to configure the environment according to user preferences. Those applications are hard to develop since they are composed by services provided by different middleware and it is needed to know the peculiarities of each of them, mainly the communication and context models. This thesis presents OpenCOPI, a platform which integrates various services providers, including context provision middleware. It provides an unified ontology-based context model, as well as an environment that enable easy development of ubiquitous applications via the definition of semantic workflows that contains the abstract description of the application. Those semantic workflows are converted into concrete workflows, called execution plans. An execution plan consists of a workflow instance containing activities that are automated by a set of Web services. OpenCOPI supports the automatic Web service selection and composition, enabling the use of services provided by distinct middleware in an independent and transparent way. Moreover, this platform also supports execution adaptation in case of service failures, user mobility and degradation of services quality. The validation of OpenCOPI is performed through the development of case studies, specifically applications of the oil industry. In addition, this work evaluates the overhead introduced by OpenCOPI and compares it with the provided benefits, and the efficiency of OpenCOPI s selection and adaptation mechanism

Cloud Integrator: uma plataforma para composição de serviços em ambientes de computação em nuvem

With the advance of the Cloud Computing paradigm, a single service offered by a cloud platform may not be enough to meet all the application requirements. To fulfill such requirements, it may be necessary, instead of a single service, a composition of services that aggregates services provided by different cloud platforms. In order to generate aggregated value for the user, this composition of services provided by several Cloud Computing platforms requires a solution in terms of platforms integration, which encompasses the manipulation of a wide number of noninteroperable APIs and protocols from different platform vendors. In this scenario, this work presents Cloud Integrator, a middleware platform for composing services provided by different Cloud Computing platforms. Besides providing an environment that facilitates the development and execution of applications that use such services, Cloud Integrator works as a mediator by providing mechanisms for building applications through composition and selection of semantic Web services that take into account metadata about the services, such as QoS (Quality of Service), prices, etc. Moreover, the proposed middleware platform provides an adaptation mechanism that can be triggered in case of failure or quality degradation of one or more services used by the running application in order to ensure its quality and availability. In this work, through a case study that consists of an application that use services provided by different cloud platforms, Cloud Integrator is evaluated in terms of the efficiency of the performed service composition, selection and adaptation processes, as well as the potential of using this middleware in heterogeneous computational clouds scenarios

Data analytics in the cloud with flexible mapreduced workflows

Data analytic applications are characterized by large data sets that are subject to a series of processing phases. Some of these phases are executed sequentially but others can be executed concurrently or in parallel on clusters, grids or clouds. The MapReduce programming model has been applied to process large data sets in cluster and cloud environments. For developing an application using MapReduce there is a need to install/configure/access specific frameworks such as Apache Hadoop or Elastic MapReduce in Amazon Cloud. It would be desirable to provide more flexibility in adjusting such configurations according to the application characteristics. Furthermore the composition of the multiple phases of a data analytic application requires the specification of all the phases and their orchestration. The original MapReduce model and environment lacks flexible support for such configuration and composition. Recognizing that scientific workflows have been successfully applied to modeling complex applications, this paper describes our experiments on implementing MapReduce as subworkflows in the AWARD framework (Autonomic Workflow Activities Reconfigurable and Dynamic). A text mining data analytic application is modeled as a complex workflow with multiple phases, where individual workflow nodes support MapReduce computations. As in typical MapReduce environments, the end user only needs to define the application algorithms for input data processing and for the map and reduce functions. In the paper we present experimental results when using the AWARD framework to execute MapReduce workflows deployed over multiple Amazon EC2 (Elastic Compute Cloud) instances.

Autonomic Activities in the Execution of Scientific Workflows: Evaluation of the AWARD Framework

Workflows have been successfully applied to express the decomposition of complex scientific applications. However the existing tools still lack adequate support to important aspects namely, decoupling the enactment engine from tasks specification, decentralizing the control of workflow activities allowing their tasks to run in distributed infrastructures, and supporting dynamic workflow reconfigurations. We present the AWARD (Autonomic Workflow Activities Reconfigurable and Dynamic) model of computation, based on Process Networks, where the workflow activities (AWA) are autonomic processes with independent control that can run in parallel on distributed infrastructures. Each AWA executes a task developed as a Java class with a generic interface allowing end-users to code their applications without low-level details. The data-driven coordination of AWA interactions is based on a shared tuple space that also enables dynamic workflow reconfiguration. For evaluation we describe experimental results of AWARD workflow executions in several application scenarios, mapped to the Amazon (Elastic Computing EC2) Cloud.

Reconfiguração dinâmica estruturada de workflows de serviços web

Dissertação para obtenção do Grau de Mestre em Engenharia Informática

Os valores semânticos das preposições a, até e para em Português Europeu Trajetórias, fronteiras, telicidade e topologia

Tese apresentada para cumprimento dos requisitos necessários à obtenção do grau de Doutor em Linguística

A distributed platform for the volunteer execution of workflows on a local area network

Thesis submitted in fulfilment of the requirements for the Degree of Master of Science in Computer Science

Ontology-based representation and generation of workflows for micro-task human-machine computation

Doctoral Program in Computer Science

Generación de metadatos semánticos mediante juegos on-line

Actualmente se pretende que los ordenadores puedan entender la semántica de la información que hay en la Web y que sea posible integrar diversas fuentes de información independientemente de la procedencia y formato de éstas, haciendo así una Web Semántica. Uno de los mayores problemas que tiene la Web Semántica es la falta de contenidos semánticos, principalmente debido a la falta de métodos de anotación automáticos existentes. Una forma de resolver este problema se basa en esconder tras aplicaciones que la gente usa diariamente, como los juegos on-line, estos procesos de generación de metadatos semánticos. El objetivo de este proyecto es estudiar diferentes iniciativas que tratan de enmascarar la generación de metadatos semánticos a través de los juegos on-line y el desarrollo de un prototipo de casual game para anotar semánticamente recursos. Se trata de un juego sencillo de pregunta-respuesta, donde dos usuarios concurrentes contestan a preguntas preestablecidas y definidas dentro de una ontología de dominio, obteniendo puntos en aquellas preguntas donde hayan dado la misma respuesta.

Herramientas de wikis semánticos

Este trabajo pretende hacer un análisis sobre la web semántica, centrándose en los wikis semánticos, definiendo qué son, cómo trabajan, estableciendo las situaciones en las que son necesarios..., y concluyendo con un estado del arte de las herramientas que se nos ofrecen y analizando una de ellas.

Lenguajes de modelado de procesos para Servicios Web Semánticos : Caso de estudio BPEL4WS y WSMO

Estudi de les tecnologies Web Service Modeling Ontology (WSMO) i Business Process Execution Language For Web Services (BPEL4WS) i anàlisi de WSMO i de BPEL4WS documentant els punts clau de cada tecnologia, a continuació se'n realitzarà una comparativa entre les esmentades tecnologies, posant una especial atenció a WSMO

Internet-based workflows

Workflow technology is expanding rapidly. In doing so, new technologies are employed. The internet, which is one such technology, could allow every user within an organization to make use of workflow. The internet- based workflows are discussed in this thesis from technical and, also, from economical points of view. First, as an ampler introduction, there are presented the basic concepts related to this topic: the workflow concept, about processes and workflows and the workflow management system. Also in this introduction it is discussed about the XML language and the overview of the Web Services stack. Then is explained how the internet-based workflows work: is presented the architecture of an internet-based enterprise and, also, the flows between web-services. Finally, there are presented, briefly, some workflow languages. In addition, based on this knowledge, a sample workflow was implemented.

Managing open access workflows at the University of St Andrews: challenges and Pathfinder solutions

Presentation of Janet Aucock, at the FinELib Consortium Seminar (Aineistopäivä), April 16, 2015 in Helsinki.

Adquisición de conceptos y evolución de sus componentes semánticos.

Probar que el léxico infantil atraviesa una serie de etapas lingüísticas y cognitivas hasta su conformación definitiva. La parte empírica del trabajo pretende corroborar esta evolución conceptual. Muestra no representativa, compuesta por 40 niños entre cinco y ocho años de Preescolar, primero, segundo y tercer curso de EGB, pertenecientes al Colegio Nacional Aniceto Sela de Mieres. En un primer apartado se expone el modelo teórico de Vygotski y Luria sobre el pensamiento y el lenguaje. En el segundo se exponen una serie de teorías de enfoque psicolingüístico que explican el desarrollo semántico y cognoscitivo del lenguaje: teoría referencial, teoría atómica del significado. El tercer apartado trata de ver la incidencia de la variable edad en la adquisición y uso de conceptos basándose en la hipótesis de los rasgos semánticos. Prueba gráfica consistente en pares de dibujos, que el niño debe identificar con los conceptos a los que representan. Véase Bibliografía. Análisis de diferentes teorías sobre el desarrollo semántico. En la prueba gráfica se utilizan porcentajes para la descripción de los resultados de la misma. Los conceptos que componen el lenguaje infantil se adquieren en base a una suma o adicción de rasgos semánticos, que establece una jerarquía en el orden de adquisición y que sigue la línea que va desde lo más general a lo más específico.

Efectos semánticos y de aprendizaje en el razonamiento deductivo.

Comprobar si los modelos o esquemas de razonamiento son moldeables por los factores semánticos. 34 estudiantes de octavo de EGB de un colegio público, 66 estudiantes de Pedagogía (Curso de Adaptación) y 20 estudiantes de FP. Pruebas de razonamiento silogístico, pruebas de razonamiento deductivo compuestas por diez problemas, pruebas abstractas, positivas y negativas. Correlación de Pearson entre las pruebas de silogismos abstractos, positivos y negativos; diferencias de medias; análisis estadísticos. Los factores influencian el razonamiento deductivo humano: socio-cognitivo y los conflictos.