Abstract
This paper presents a new algorithm for a real-time obstacle avoidance for autonomous surface vehicles (ASV) that is capable of undertaking preemptive actions in complex and challenging scenarios. The algorithm is called adaptive velocity obstacle avoidance (AVOA) and takes into consideration the kinematic and dynamic constraints of autonomous vessels along with a protective zone concept to determine the safe crossing distance to obstacles. A configuration space that includes both the position and velocity of static or dynamic elements within the field-of-view of the ASV is supporting a particle swarm optimization procedure that minimizes the risk of harm and the deviation towards a predefined course while generating a navigation path with capabilities to prevent potential collisions. Extensive experiments demonstrate the ability of AVOA to select a velocity estimative for ASVs that originates a smoother, safer and, at least, two times more effective collision-free path when compared to existing techniques.

Abstract
Este artigo apresenta reflexões seminais acerca da utilização de tutores virtuais no sistema de e-learning da Universidade Aberta. O tutor virtual é uma analogia do tutor humano, adota uma interface antropomórfica com características emocionais, comumente denominado de avatar, que integra inteligência artificial e pode constituir uma abordagem interessante, tanto para o professor como para os estudantes, se se perspetivar o futuro dos ambientes típicos de ensino e educação a distância online e em rede e a crescente massificação da individualização do acompanhamento do estudante. Embora atraente de muitas formas, especialmente quando se leva em linha de conta a redução da carga da interação e do apoio que um professor (humano) deve fornecer nesses ambientes, várias questões se colocam visando a plena e efetiva integração de avatares como artefactos de mediação da tutoria virtual. Este artigo fornece um conjunto de perspetivas iniciais sobre este desafio, introduzindo o estado da arte no campo, enquanto apresenta alguns desenvolvimentos recentes e em experimentação na Universidade Aberta pela instanciação de dois avatares – a Maria e o João.;This article presents seminal reflections on the use of virtual tutors in the Aberta University e-learning system. The virtual tutor is an analogy of the human tutor, adopting an anthropomorphic interface with emotional characteristics, commonly called an avatar, which integrates artificial intelligence, and can be an interesting approach for both the teacher and the students, if the future of environments typical of online and networked distance learning and education, and the increasing massification of the individualization of student follow-up. Although attractive in many ways, especially when one takes into account the reduction of the interaction load and the support that a (human) teacher must provide in these environments, several questions are posed for the full and effective integration of avatars as mediation artifacts of virtual tutoring. This article provides a set of initial perspectives on this challenge, introducing the state of the art in the field, while presenting some recent developments and experimentation at the Aberta University by the instantiation of two avatars - Mary and John.

Abstract
A lot has been said about the digital natives and their natural way of integrating the internet in their daily activities. Millennials have been considered a unique segment of consumers by researchers and practitioners alike, due to their ability and propensity to adopt and adapt new media to their daily routine. Although it is expectable that they are particularly keen on embracing IoT, extant literature is scarce on their views on the adoption of IoT to their home, work, and leisure activities. In this chapter, the authors analyze the potential of the millennial segment to IoT products and services. Results of a qualitative study with Portuguese consumers are included and provide interesting cues to marketers working with IoT offers.

Abstract
This paper describes the use of NAO robot, a humanoid robot and the use of Arduino in education for final engineering projects in the area of engineering. This learning approach was implemented in the final project of the Biomedical Engineering degree. The objective this project is the sensorial extension of the NAO platform, integrating a set of sensors that allow not only to analyze multiple vital parameters in a passive way but also to obtain a more precise contextual information. © CLAWAR Association.

Abstract
Healthcare institutions face serious security challenges, namely confidentiality, integrity and availability of patient's data due to the amounts of sensitive data collected on Health Information Systems (HIS) and the complex data management processes in health care. This paper describes scenarios of undue HIS access by staff in healthcare institutions, use cases (UC) that model the activities on HIS and identify the variables on audit trails (AT) logs that can be used to detect illegitimate actions on patients' data. Firstly, a survey was conducted through discussion meetings with Information Systems Director (ISD), Data Protection Officer (DPO) and a jurist to discuss their concerns about patient data access, followed by interviews to professionals from healthcare institutions to gather information about their routines and HIS access practices. Then, undue access scenarios were described and UC of activities on HIS which allow their detection were modelled. Lastly, necessary log variables were identified in order to produce algorithms for illegitimate accesses detection. UC and variables selected were matched with the specific requirements of Ministers Council Resolution (MCR) nr.41/2018 which provides guidelines for technology to be compliant with General Data Protection Regulations (GDPR). Discussions with ISD, DPO and the jurist, and professionals' interviews allowed us to describe nine scenarios of undue access. For each scenario we modelled one UC. 32 variables from different type of logs were identified for illegitimate access detection, of which 14 are mandatory according to MCR nr. 41/2018. Despite we might have some limitations related to poor HIS log quality, the mandatory data that logs must comply will be very useful for the development of UC presented. In addition, it is possible to request systems' vendors the improvement of logs' data to meet the detail we propose for this model, which may be very useful to comply not only with GDPR requirements but also with the Standard "Management of Information" (MOI.11) of Joint Commission International Standards for Hospitals (JCI) certification. As future work, we intend to develop the algorithms for the UC modelled, that will detect suspicious activities and produce alarmistic in their presence, testing them in real environment of a hospital to help Information Systems department and DPO on investigation and prevention of data breaches. (C) 2019 The Authors. Published by Elsevier B.V.

Abstract
This paper explores two editions of a MOOC delivered at Universidade Aberta's "AULAbERTA" (Open Class) platform. This platform offers different kinds of open learning paths and concerning specifically the MOOC learning path it is relevant to understand if the pedagogical model and the strategy achieve the desired results: (i) to improve education and enlarge the access to knowledge; (ii) to deliver high quality open and online education in Portuguese. The methodology used was based on a cross analysis of learner activity statistics against certain characteristics of the participants' profile like profession and motivations. Four categories of participants were identified and some aspects of their behaviours and engagement in the MOOC were examined, providing some insights concerning the level of participation and interaction. These elements can help us to understand some differences in the learning experiences connected with internal and external motivations and also how participants appreciate the online experience and course design.