Abstract
Though equal access to all digital devices, content and applications should be ensured by default in the Digital Age, reality has yet to match this ideal, despite the numerous efforts to raise awareness of the problem. For the visually impaired, the existence of e-accessibility issues represents a barrier that, in the majority of situations, cannot be overcome. Nevertheless, this group of individuals still insists on using digital devices, to carry out tasks from their daily lives, such as reading and writing e-mails, reading news and weather websites, and using social networks. This assumption has been validated through a survey completed by 29 blind or partially sighted individuals. Considering that the lack of depth of knowledge in developers constitutes one of the most significant constraints to the development of accessibility software and digital content, the proposal for “slide 0” to be included as an educational resource, when developers are learning how to engineer software, is discussed later in the paper. This contribution, if precisely focused on the various types of software projects, would represent a novel addition to the existing scientific literature, but also a comprehensive aid to the inclusion of e-accessibility when lecturing experts on software engineering.

Abstract
The paper presents extension of model-based disturbance rejection method based on Magnitude optimum method. The original method requires the pre-chosen values of controller and compensator filter values, which might result in a relatively noisy process input signals that are not tolerated in practice. In order to keep the process input noise under control, the proposed tuning method requires user-defined controller and compensator noise gain for high frequencies, instead. The experiments on process models show that the proposed approach is successful even though the actual and the identified process models do not match.

Abstract

Abstract
The aim of this paper is to analyse Brazil's tourism destination image taking into account travel agents and tour operators' perspectives. This paper thus seeks to complement previous research carried out based on travellers' viewpoints. This research, more specifically, sought to analyse the antecedents of Brazil's overall image from the perspective of Portuguese travel intermediaries. For that cognitive image, affective image and marketing communications were analysed as antecedents of Brazil's overall image, and visitation influence was modelled as a mediator. Based on a questionnaire completed by 132 Portuguese travel agents and tour operators, the results show that the total (direct and indirect) effect of both cognitive image and marketing communications are more important than the total effect of affective image. Moreover, the visitation influence exerts no mediation at all between affective image and overall destination image, although there is a mild partial mediation effect involving the other two antecedents (cognitive image and marketing communications). (c) 2018 The Authors.

Abstract

Abstract
The purpose of this paper is to advance the current state of physical layer security through the design and analysis of a discrete jamming scheme that exploits the reciprocal characteristic of the wireless channel with the aim to create equivocation to a passive multiple-antenna eavesdropper. Closed form solutions of the secrecy capacity for different configurations of the jamming component were obtained and successfully compare with the simulation results. Furthermore, the secrecy level provided by the developed scheme is analyzed taking into account the number of bits extracted from the channel. The asymptotic study of the proposed secrecy technique allowed to conclude that in the high-power regime, full secrecy is obtained even considering that the eavesdropper is equipped with an unlimited number of antennas.