Luiz Henrique Zambom Santana

• D.Sc.
• Universidade Federal de Santa Catarina

RDF and SPARQL are increasingly considered in a broad range of information management scenarios. Governments, large corporations , startups, open data initiatives and other organizations are using RDF as a data model with the purpose of sharing information and knowledge in several domains. In such scenario, scalability is the main issue for virtual...

RDF is being increasingly considered in a broad range of information management scenarios. Governments, large corporations, startups, and other organizations around the world are using RDF as a data model to represent and share knowledge. However, there is still a long evolutionary track with multiple challenges for RDF reaching the scale of the mo...

For many years trajectory data have been treated as sequences of space‐time points or stops and moves. However, with the explosion of the Internet of Things and the flood of big data generated on the Internet, such as weather channels and social network interactions, which can be used to enrich mobility data, trajectories become more and more compl...

The last years the precision agriculture transformed one of the most ancient activities into a humongous source of data. This can happen by means of sensors that monitor continuously the physical environment (e.g., satellite imagery, high technology machinery, micro weather stations) producing large quantities of data in an unprecedented pace. Alth...

RDF and SPARQL are increasingly used in a broad range of information management scenarios. Scalable processing of SPARQL queries has been the main goal for virtually all the recently proposed RDF triplestores. Workload-awareness is considered an important feature for the current generation of triplestores. This paper presents \textit{WA-RDF}, a mid...

RDF and SPARQL are increasingly used in a broad range of information management scenarios. Scalable processing of SPARQL queries has been the main goal for virtually all the recently proposed RDF triplestores. Workload-awareness is considered an important feature for the current generation of triplestores. This paper presents WA-RDF, a middleware t...

RDF and SPARQL are increasingly used in a broad range of information management scenarios (e.g., governments, corporations, and startups). Scalable SPARQL querying has been the main issue for virtually all the recent RDF triplestores. This paper presents WA-RDF, a middleware that addresses workload-adaptive management of large RDF graphs. Our middl...

Software engineers can consider today a multitude of storage solutions and data formats to achieve better performance , lower cost, or even explore the power expression of a data model to develop an application. We call it poly-glot access. Nevertheless, the cost of developing polyglot software increases due, for instance, to the complexity of mana...

RDF and SPARQL are increasingly used in a broad range of information management scenarios (e.g., governments, corporations, and startups). Scalable SPARQL querying has been the main issue for virtually all the recent RDF triplestores. This paper presents WA-RDF, a middleware that addresses workload-adaptive management of large RDF graphs. Our middl...

Governments, corporations, startups, open data initiatives and other organizations are increasingly considering RDF and SPARQL in a broad range of information management scenarios. To reduce SPARQL querying times has been the main issue for virtually all the recent RDF triplestores, yet SPARQL caching techniques have not been broadly considered. In...

Governments, corporations, startups, open data initiatives and other organizations are increasingly considering RDF and SPARQL in a broad range of information management scenarios. To reduce SPARQL querying times has been the main issue for virtually all the recent RDF triplestores, yet SPARQL caching techniques have not been broadly considered. In...

The speed of information publishing in WWW is unprecedented. The individuals and organizations struggle to be up to date and find relevant knowledge from a tsunami of news, videos, posts, and comments. In the other hand, these contents (mostly bound to HTML pages) are unstructured and not explicitly classified. In this context, machine-learning tec...

The Reflexive Electronic Portfolio (PRE) is a collaborative environment developed under the prism of Web 2.0, which supports the process of teaching and learning in constructivist courses of medicine. In its first version PRE supports educational activities presented through texts created by teachers, this paper presents the evolution of the PRE al...

Currently, is verified a growth of the participation of mobile devices in the access of available multimedia content in P2P networks. However, the majority of these devices still having limited access to these networks, because almost all the available content is created exclusively for PCs. Aiming to improve this access, this paper presents a poss...

This paper proposes a Ubiquitous Computing Environment for Medical Education, whose kernel is a Web-based system with collaborative tools, to support the interactions and computational tasks among different actors involved in the Medical Education process. In order to allow this environment to be ubiquitous, the Web pages of this system are adapted...

This paper proposes an information retrieval process that employs a relevance feedback approach based on implicit evidences provided by contextual information and explicit evidences provided by the user behavior during interaction. This process takes advantage of semantic information processing enabled by the use of ontologies to build semantic ind...

This paper presents the Electronic Reflexive Portfolio (ERP), a collaborative content creation environment, which supports the teaching/learning process in constructivism-based medical courses. The ERP was developed under the concepts of Web 2.0, having a social network, AJAX tools for the content creation, and a folksonomy-based mechanism for cont...

This paper proposes an ubiquitous computing environ ment to support medical education centered on Problem Based Learning (PBL). The ACUEM-PBL, whose the main tool of storage and refle ction is an Electronic Reflexive Portfolio, allows the cooperative work su pported by several devices. This environment is been evaluated at the medicine undergraduat...

Resumo. Este artigo apresenta o framework UBICK, construído para reuso no desenvolvimento de aplicações ubíquas cientes de contexto, cujo desenvolvimento baseou-se Agentes de Software. Agentes de Software são combinados com Ontologias, que representam o contexto das aplicações ubíquas, e Serviços Web Semânticos, componentes de software distribuídos...

This paper presents an approach that combines Ontologies, Semantic Web Services and Mobile Agents, for the Component-Based Software Development. The Ontologies are employed to improve the problem domain analysis, and to get software components with a semantic description, which may be reused in a wide variety of applications. The Semantic Web Servi...

Small mobile devices for accessing the Internet through wireless access networks have become increasingly common in recent years. In this new context, a major challenge is the adaptation of content to these devices, satisfying their capabilities and user preferences and optimizing the use of wireless access networks. This paper therefore presents a...

Over the last few years, the Web's expansion has been accompanied by a growing number of mobile devices with Internet access capabilities. However, most Web-based content is still developed for presentation on personal computers, disregarding the limited resources of these mobile devices (e.g., processing, memory, power, screen, markup languages)....

The Electronic Reflexive Portfolio is a collaborative environment for Web content creation, which supports the teaching/learning process in constructivism-based Medical courses. This paper presents an architectural view of PRE, and the evaluations performed at the Medical graduation course of Federal Uni- versity of São Carlos.