Search results for " retrieval."

Export of Relational Databases to RDF Databases by Model Transformations

2011

The Semantic Web is a Web of Data. To fulfill this web with data we need methods how to transfer business data from existing relational databases. In most cases, textual mapping languages are used for the specification of correspondences between relational DB schema and OWL ontology. These languages generally are rather awkward and not well-suited for the specification of mappings in cases when there is a substantial semantic gap between the source ER schema and the target OWL ontology. At the same time specification of mappings is a classical use case for graphical model transformation languages. In our previous work [10] we have proposed a new, model transformation-based method for the sp…

A Semantic Model to Query Spatial–Temporal Data

2013

There is a growing need for the study of spatial–temporal objects and their relationships. A common approach for this task is the use of relational databases, which unfortunately do not allow inference. In this research, we introduce a new approach that uses the concept of a “continuum” together with ontologies and semantic Web technologies. The continuum allows us to define parent–child relationships between representations of objects. It also allows us to compare the evolution of two different objects and establish the relationships between them along time. Our approach is based on the four-dimensional fluent, which is extended to obtain spatial–temporal qualitative information from the a…

Active Learning System in the Context of the Social Semantic Web

2013

In this paper we present the concept and the implementation of an Active Semantic Learning System that takes advantage of the Social Semantic Web in order to deliver an efficient and personalized learning experience to the learner. Active participation of the learner is encouraged through the social learning approach and through techniques that adapt the learning content to learners' needs and preferences. The semantic layer allows us to define a common understanding of the data used to describe the objects in the learning system. The objects in the learning system are described using semantic web technologies. Domain ontologies and explicit logic rules are defined in order to allow data in…

Distributed image retrieval on DAISY

2006

The paper describes an application of image retrieval based on DAISY architecture (distributed architecture for intelligent system). The creation of pictorial indexes may require a number of hours depending on the size of the pictorial data base. The problem can become more complex in the case of distributed database systems. In both cases a distributed architecture can be the natural and more efficient solution. DAISY architecture is based on the concept of co-operating behavioral agents supervised by a central engagement module. Preliminary experiments, to evaluate the performance of the system, have been performed on a astronomical database and coral image

Accuracy of referencing of Spanish names in Medline

2003

A homemade cytospin apparatus

2006

Combining OWL Ontologies Using -Connections

2006

The standardization of the Web Ontology Language, OWL, leaves (at least) two crucial issues for Web-based ontologies unsatisfactorily resolved, namely how to represent and reason with multiple distinct, but linked ontologies, and how to enable effective knowledge reuse and sharing on the Semantic Web. In this paper, we present a solution for these fundamental problems based on ℇ-Connections. We aim to use ℇ-Connections to provide modelers with suitable means for developing Web ontologies in a modular way and to provide an alternative to the owl:imports construct. With such motivation, we present in this paper a syntactic and semantic extension of the Web Ontology language that covers ℇ-Conn…

Another Small Step Forward in ALPPS

2020

Using UDDI for Publishing Metadata of the Semantic Web

2006

Although UDDI does not provide support for semantic search, retrieval and storage, it is already accepted as an industrial standard and a huge number of services already store their service specifications in UDDI. Objective of this paper is to analyze possibilities and ways to use UDDI registry to allow utilization of meta-data encoded according to Semantic Web standards for semantic-based description, discovery and integration of web resources in the context of needs of two research projects: “Adaptive Services Grid” and “SmartResource”. We present an approach of mapping RDFS upper concepts to UDDI data model using tModel structure, which makes possible to store semantically annotated reso…

Certain advantages of Scopus compare with Web of Science in a bibliometric analysis related to smoking

2013

El objetivo de este trabajo es comparar entre Web of Science (WoS) y Scopus los indicadores bibliométricos básicos del área de tabaquismo de autores españoles en el período 2000-2009. Métodos: La búsqueda se realizó en el SCI-Expanded y Scopus (“smok*” OR “tobac*”). Resultados: La media total anual del nº de documentos fue de 41 ± 12 para WoS vs 60 ± 16 en Scopus (p = 0,007). Aumento progresivo del índice de colaboración. La media anual del índice de colaboración fue de 9,41 ± 2,73 en WoS vs 7,12 ± 1,52 en Scopus (p = 0,029). Mayor número de citas con el paso del tiempo en ambas bases de datos pero son más recientes las citas en Scopus, el índice citas/artículo fue mayor en WoS (WoS 14,47 v…