Duncan Dubugras Alcoba Ruiz

Learn More
Web usage mining (WUM) is the process of extracting navigation behaviour patterns that allow analysing users' interactions with Web-based environments. We discuss the impact of developing the WUM preprocessing phase according to concepts, problems and goals specific to Web-based learning environments. We present a tool prototype that automates typical tasks(More)
This paper presents an approach to describe business process in production systems using workflow concepts. In this sense, we define an extension of the UML Activity Diagram called Workflow Activity Diagram (WAD) which applies the C-WF model concepts. The C-Wf model represents the structural and functional enterprise objects involved in the business(More)
Model trees are a particular case of decision trees employed to solve regression problems. They have the advantage of presenting an interpretable output, helping the end-user to get more confidence in the prediction and providing the basis for the end-user to have new insight about the data, confirming or rejecting hypotheses previously formed. Moreover,(More)
Web Usage Mining (WUM) aims to extract navigation usage patterns from Web server logs. Mining algorithms yield usage patterns, but finding the ones that constitute new and interesting knowledge in the domain remains a challenge. Typically, analysts have to deal with a huge volume of pattern, from which they have to retrieve the potentially interesting one(More)
We introduce the ActivityFlow specification language for flexible specification, composition, and coordination of workflow activities. The most interesting features of the ActivityFlow specification language include: (1) a collection of specification mechanisms, allowing workflow designers to use a uniform workflow specification interface to describe(More)
Software effort prediction has been a challenge for researchers throughout the years. Several approaches for producing predictive models from collected data have been proposed, although none has become standard given the specificities of different software projects. The most commonly employed strategy for estimating software effort, the multivariate linear(More)
This work presents an object-oriented approach to model business processes in production systems using workflow concepts. We define an object reference model called C-Wf that represents the structural and functional enterprise elements involved in the business processes, such as enterprise activities, human resources, machines, etc. Through the C-Wf(More)
Among the key factors for the success of a metrics program are the regularity of metrics collection, a seamless and efficient data collection methodology, and the presence of non-intrusive automated data collection tools. This paper presents the software process data warehousing architecture SPDW+ as a solution to the frequent, seamless, and automated(More)
This paper presents an approach to describe business process in production systems using workflow concepts. This work presents an approach to model workflow applications based on the C-Wf model and UML (Unified Modeling Language) Activity Diagrams. The C-Wf model represents the structural and functional enterprise objects involved in the business processes,(More)
Decision trees are widely disseminated as an effective solution for classification tasks. Decision tree induction algorithms have some limitations though, due to the typical strategy they implement: recursive top-down partitioning through a greedy split evaluation. This strategy is limiting in the sense that there is quality loss while the partitioning(More)