Manuel Freire

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Traditional network analysis tools support analysts in studying a single network. ManyNets offers these analysts a powerful new approach that enables them to work on multiple networks simultaneously. Several thousand networks can be presented as rows in a tabular visualization, and then inspected, sorted and filtered according to their attributes. The(More)
A data mining and visualization tool for the discovery of student trails in web-based educational systems is presented and described. The tool uses graphs to visualize results, allowing non-expert users, such as course instructors, to interpret its output. Several experiments have been conducted, using real data collected from a web-based intelligent(More)
Thymosin alpha(1) (T alpha(1)) and thymosin T alpha(11) (T alpha(11)) are polypeptides with immunoregulatory properties first isolated from thymic extracts, corresponding to the first 28 and 35 amino acid residues, respectively, of prothymosin alpha (ProT alpha), a protein involved in chromatin remodeling. It has been widely supposed that these polypeptides(More)
We present EGDA, an educational game development approach focused on the teaching of procedural knowledge using a cost-effective approach. EGDA proposes four tasks: analysis, design, implementation, and quality assurance that are subdivided in a total of 12 subtasks. One of the benefits of EGDA is that anyone can apply it to develop a game since it keeps(More)
The Learning Analytics (LA) discipline analyzes educational data obtained from student interaction with online resources. Most of the data is collected from Learning Management Systems deployed at established educational institutions. In addition, other learning platforms, most notably Massive Open Online Courses such as Udacity and Coursera or other(More)
Complex hypermedia structures can be difficult to author and maintain, especially when the usual hierarchic representation cannot capture important relations. We propose a graph-based direct manipulation interface that uses multiple focus+context techniques to avoid display clutter and information overload. A semantical fisheye lens based on hierarchical(More)
Graphs provide good representations for many domains. Interactive graph-based interfaces are desireable to browse and edit data for these domains. However, as graphs increase in size, interactive interfaces risk information overload and low responsiveness. Focus+context approaches overcome these problems by presenting abridged views of the graph. Users can(More)
Massive Online Open Courses are in the process of radically changing the use of technology in education, as measured both by the number of enrolled students and the level of academic excellence of the institutions that are driving their adoption. Typically, online learning management systems have relied on simple questionnaires for feedback and evaluation.(More)
This paper presents our perspective on serious games, covering relevant aspects of the current situation and what we consider are the key elements to be developed over the next few years. Serious games have undergone a long journey from niche research to application in real settings, coming closer to the generalization of games in mainstream education. We(More)
MOOCs are disrupting educational technology by democratizing access to high quality courses offered by some of the most prestigious universities. However, due to low entry cost and multiple other factors, MOOCs suffer from low retention rates: making MOOCs more interactive and engaging is therefore an important goal. Educational games provide environments(More)