João Eduardo Ferreira

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BACKGROUND We analyzed rates of drug resistance mutations in antiretroviral-naive São Paulo blood donors with recently acquired or established HIV-1 infections and characterized clade diversity in this population. METHODS Six hundred forty-eight seropositive blood donor specimens were identified at the Blood Center of São Paulo between July 1998 and March(More)
We developed a database system for collaborative HIV analysis (DBCollHIV) in Brazil. The main purpose of our DBCollHIV project was to develop an HIV-integrated database system with analytical bioinformatics tools that would support the needs of Brazilian research groups for data storage and sequence analysis. Whenever authorized by the principal(More)
Co-authored documents are becoming increasingly important for knowledge representation and sharing. Tools for supporting document co-authoring are expected to satisfy two requirements: 1) querying changes over editing histories; 2) maintaining data consistency among users. Current tools support either limited queries or are not suitable for loosely(More)
BACKGROUND In Brazil nationally representative donor data are limited on human immunodeficiency virus (HIV) prevalence, incidence, and residual transfusion risk. The objective of this study was to analyze HIV data obtained over 24 months by the Retrovirus Epidemiology Donor Study-II program in Brazil. STUDY DESIGN AND METHODS Donations reactive to third-(More)
BACKGROUND The safety of the blood supply is ensured through several procedures from donor selection to testing of donated units. Examination of the donor deferrals at different centers provides insights into the role that deferrals play in transfusion safety. STUDY DESIGN AND METHODS A cross-sectional descriptive study of prospective allogeneic blood(More)
The multidimensional data analysis is one of the important tasks carried through data mining operation. However, it does not consider the need for automatic comparison between several data classification[1,2]. This research presents a component to analyse the relations between multidimensional data. This component supports the process of knowledge(More)
Data warehouse use has increased significantly in recent years and now plays a fundamental role in many organizations' decision-support processes. A framework that uses parameter sets to define the most suitable synchronization option for a given transaction processing environment helps decrease the update time between the transactional and analytical(More)
Despite recent advances in many real-time and workflow management systems (WFMS), event-handling is still a manual or semi-automated task. The integration of automated event processing with workflows remains an open research challenge to both academic and industrial communities. In this work, we propose a concrete approach that logs interactions between(More)