Browsing by Author "Silva, Rui Jorge"
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- Analyzing the behavior of top spam botnetsPublication . Silva, Rui Jorge; Rodrigues, Nuno G.; Salvador, Paulo; Nogueira, António ManuelBotnets became the preferred platform for launching attacks and committing fraud on enterprise networks and the Internet itself. Characterizing existing Botnets will help to coordinate and develop new technologies to face this serious security threat. Several approaches can be taken to study this phenomenon: analyze its source code, which can be a hard task mainly due to license restrictions; study the control mechanism, particularly the activity of its Command and Control server(s); study its behavior, by measuring real traffic and collecting relevant statistics. In this work, we have installed some of the most popular spam Botnets, capturing the originated traffic and characterizing it in order to identify the main trends/patterns of their activity. From the intensive statistics that were collected, it was possible to conclude that there are distinct features between different Botnets that can be explored to build efficient detection methodologies.
- Differences of gender in oral and written communication apprehension of university studentsPublication . Loureiro, Marlene; Loureiro, Norberto; Silva, Rui JorgeOral and written skills are increasingly considered to be essential tools in the job market for the success of any worker, and are thus called soft skills. Nevertheless, most graduates who enter the labor market experience di culties in the apprehension of communication, not only with regard to writing, but also in oral communication. These di culties are also noticeable in the classroom, for instance when students need to participate by expressing their doubts when they have to present research work within the curricular units they attend, or when they have to write their answers in assessment tests. In this paper, we explore the communication skills of students fromdi erent graduate degrees (n = 345) in order to understand how they prepare for oral and written communication. We made use of the Personal Report of Communication Apprehension (PRCA), validated by McCroskey, Beatty, Kearney, and Plax (1985), in order to understand students’ oral communication apprehension. To understand the levels of written communication apprehension, we applied the Daly–Miller Writing Apprehension Test (DMWA). We thus analyzed the communicational skills and the communication apprehension of students from social and human sciences courses in order to understand how they prepare for oral and writing communication, and whether there were di erences between genders and between di erent graduate courses regarding communication apprehension. The main results of this research confirm that the students experienced di culties with and fear of communication, especially for oral communication. Furthermore, the results indicate that female students showed more significant levels of anxiety with regard to oral and written communication than male students. This exploratory study also makes it possible to distinguish areas of communication apprehension according to the di erent genders, and even with regard to the degree courses students belonged to.