Dynamic Hilbert clustering based on convex set for web services aggregation

In recent years, web services run by big corporations and different application-specific data centers have all been embraced by several companies worldwide. Web services provide several benefits when compared to other communication technologies. However, it still suffers from congestion and bottlenecks as well as a significant delay due to the tremendous load caused by a large number of web service requests from end users. Clustering and then aggregating similar web services as one compressed message can potentially achieve network traffic reduction. This paper proposes a dynamic Hilbert clustering as a new model for clustering web services based on convex set similarity. Mathematically, the suggested models compute the degree of similarity between simple object access protocol (SOAP) messages and then cluster them into groups with high similarity. Next, each cluster is aggregated as a compact message that is finally encoded by fixed-length or Huffman. The experiment results have shown the suggested model performs better than the conventional clustering techniques in terms of compression ratio. The suggested model has produced the best results, reaching up to 15 with fixed-length and up to 20 with Huffma

Using Semantic Web Services for AI-Based Research in Industry 4.0

The transition to Industry 4.0 requires smart manufacturing systems that are easily configurable and provide a high level of flexibility during manufacturing in order to achieve mass customization or to support cloud manufacturing. To realize this, Cyber-Physical Systems (CPSs) combined with Artificial Intelligence (AI) methods find their way into manufacturing shop floors. For using AI methods in the context of Industry 4.0, semantic web services are indispensable to provide a reasonable abstraction of the underlying manufacturing capabilities. In this paper, we present semantic web services for AI-based research in Industry 4.0. Therefore, we developed more than 300 semantic web services for a physical simulation factory based on Web Ontology Language for Web Services (OWL-S) and Web Service Modeling Ontology (WSMO) and linked them to an already existing domain ontology for intelligent manufacturing control. Suitable for the requirements of CPS environments, our pre- and postconditions are verified in near real-time by invoking other semantic web services in contrast to complex reasoning within the knowledge base. Finally, we evaluate our implementation by executing a cyber-physical workflow composed of semantic web services using a workflow management system.Comment: Submitted to ISWC 202

Framework for IoT Service Oriented Systems

The forth industrial revolution is here, and with it Industry 4.0, which translates in many changes to the industry. With the introduction of paradigms like Internet of Things, Cyber Physical Systems or Cloud Computing, the so called Smart Factories are becoming a main part of today’s manufacturing systems. The vf-OS Project, where this thesis falls, intends to be an Open Operating System for Virtual Factories where the overall network of a collaborative manufacturing and logistics environment can be managed and thus enabling humans, applications and devices to communicate and interoperate in an interconnected operative environment. This thesis intends to contribute to the vision that any kind of sensor or actuator plugged to the virtual factory network, becomes promptly accessible in the operative environment and the services that it provides can be accessed and used by any API composing the system. Finally, it also aims to prove that an IoT Service Oriented Sys-tem constituted of open software components can be of great assistance and provide numerous contributions to the emerging Industry 4.0 and consequently to the Factories of the Future. With that aim, this thesis will focus on the development of two out of five inter-connected applications that answer not only to different use case scenarios presented in the vf-OS but also provide solutions to answer a practical agriculture scenario, which uses mainly IoT devices and other cutting-edge technologies like cloud compu-ting and FIWARE

Una investigación sobre arquitecturas que soportan la composición de servicios web semánticos: una revisión sistemática

En la actualidad muchas instituciones están migrando sus procesos de negocio de manera que se encuentren soportados por servicios web para facilitar la interoperabilidad con otras instrucciones y una mejor reutilización de sus componentes, sin embargo la manera sintáctica como se describen los servicios web en la actualidad presentan sus limitaciones cuando se desean hacer actividades automatizadas de descubrimiento, composición e invocación de los servicios web más convenientes. Estas limitaciones están siendo cubiertas con la combinación de conceptos de la web semántica y de los servicios web existentes dando lugar a los servicios web semánticos (SWS). Pero aún existen desafíos que deben resolverse tal como la composición de los servicios web semánticos, este problema se vuelven más críticos sobre todo en las instituciones financieras cuyos procesos de negocio están compuestos por más de un servicio. El objetivo de este trabajo es llenar ese vacío mediante una revisión sistemática de la literatura existente acerca de las arquitecturas planteadas en la composición de servicios web semánticos. Este documento tiene tres propósitos: en primer lugar, proponer una definición y discusión de las arquitecturas de servicios web compuestos, obtener una clasificación de las arquitecturas en base a sus componentes. En base a clasificación, se identifican y discuten necesidades de investigación futuras.Tesi

Una investigación sobre arquitecturas que soportan la composición de servicios web semánticos: una revisión sistemática

En la actualidad muchas instituciones están migrando sus procesos de negocio de manera que se encuentren soportados por servicios web para facilitar la interoperabilidad con otras instrucciones y una mejor reutilización de sus componentes, sin embargo la manera sintáctica como se describen los servicios web en la actualidad presentan sus limitaciones cuando se desean hacer actividades automatizadas de descubrimiento, composición e invocación de los servicios web más convenientes. Estas limitaciones están siendo cubiertas con la combinación de conceptos de la web semántica y de los servicios web existentes dando lugar a los servicios web semánticos (SWS). Pero aún existen desafíos que deben resolverse tal como la composición de los servicios web semánticos, este problema se vuelven más críticos sobre todo en las instituciones financieras cuyos procesos de negocio están compuestos por más de un servicio. El objetivo de este trabajo es llenar ese vacío mediante una revisión sistemática de la literatura existente acerca de las arquitecturas planteadas en la composición de servicios web semánticos. Este documento tiene tres propósitos: en primer lugar, proponer una definición y discusión de las arquitecturas de servicios web compuestos, obtener una clasificación de las arquitecturas en base a sus componentes. En base a clasificación, se identifican y discuten necesidades de investigación futuras.Tesi

An Approach to Automatically Distribute and Access Knowledge within Networked Embedded Systems in Factory Automation

This thesis presents a novel approach for automatically distribute and access knowledge within factory automation systems built by networked embedded systems. Developments on information, communication and computational technologies are making possible the distribution of tasks within different control resources, resources which are networked and working towards a common objective optimizing desired parameters. A fundamental task for introducing autonomy to these systems, is the option for represent knowledge, distributed within the automation network and to ensure its access by providing access mechanisms. This research work focuses on the processes for automatically distribute and access the knowledge.Recently, the industrial world has embraced service-oriented as architectural (SOA) patterns for relaxing the software integration costs of factory automation systems. This pattern defines a services provider offering a particular functionality, and service requesters which are entities looking for getting their needs satisfied. Currently, there are a few technologies allowing to implement a SOA solution, among those, Web Technologies are gaining special attention for their solid presence in other application fields. Providers and services using Web technologies for expressing their needs and skills are called Web Services. One of the main advantage of services is the no need for the service requester to know how the service provider is accomplishing the functionality or where the execution of the service is taking place. This benefit is recently stressed by the irruption of Cloud Computing, allowing the execution of certain process by the cloud resources.The caption of human knowledge and the representation of that knowledge in a machine interpretable manner has been an interesting research topic for the last decades. A well stablished mechanism for the representation of knowledge is the utilization of Ontologies. This mechanism allows machines to access that knowledge and use reasoning engines in order to create reasoning machines. The presence of a knowledge base allows as clearly the better identification of the web services, which is achievable by adding semantic notations to the service descriptors. The resulting services are called semantic web services.With the latest advances on computational resources, system can be built by a large number of constrained devices, yet easily connected, building a network of computational nodes, nodes that will be dedicated to execute control and communication tasks for the systems. These tasks are commanded by high level commanding systems, such as Manufacturing Execution Systems (MES) and Enterprise Resource Planning (ERP) modules. The aforementioned technologies allow a vertical approach for communicating commanding options from MES and ERP directly to the control nodes. This scenario allows to break down monolithic MES systems into small distributed functionalities, if these functionalities use Web standards for interacting and a knowledge base as main input for information, then we are arriving to the concept of Open KnowledgeDriven MES Systems (OKD-MES).The automatic distribution of the knowledge base in an OKD-MES mechanism and the accomplishment of the reasoning process in a distributed manner are the main objectives for this research. Thus, this research work describes the decentralization and management of knowledge descriptions which are currently handled by the Representation Layer (RPL) of the OKD-MES framework. This is achieved within the encapsulation of ontology modules which may be integrated by a distributed reasoning process on incoming requests. Furthermore, this dissertation presents the concept, principles and architecture for implementing Private Local Automation Clouds (PLACs), built by CPS.The thesis is an article thesis and is composed by 9 original and referred articles and supported by 7 other articles presented by the author