Energy-Aware Security Adaptation for Low-Power IoT Applications

The constant evolution in communication infrastructures will enable new Internet of Things (IoT) applications, particularly in areas that, up to today, have been mostly enabled by closed or proprietary technologies. Such applications will be enabled by a myriad of wireless communication technologies designed for all types of IoT devices, among which are the Long-Range Wide-Area Network (LoRaWAN) or other Low-power and Wide-Area Networks (LPWAN) communication technologies. This applies to many critical environments, such as industrial control and healthcare, where wireless communications are yet to be broadly adopted. Two fundamental requirements to effectively support upcoming critical IoT applications are those of energy management and security. We may note that those are, in fact, contradictory goals. On the one hand, many IoT devices depend on the usage of batteries while, on the other hand, adequate security mechanisms need to be in place to protect devices and communications from threats against their stability and security. With thismotivation in mind, we propose a solution to address the management, in tandem, of security and energy in LoRaWAN IoT communication environments. We propose and evaluate an architecture in the context of which adaptation logic is used to manage security and energy dynamically, with the goal of guaranteeing appropriate security, while promoting the lifetime of constrained sensing devices. The proposed solution was implemented and experimentally evaluated and was observed to successfully manage security and energy. Security and energy are managed in line with the requirements of the application at hand, the characteristics of the constrained sensing devices employed and the detection, as well as the threat, of particular types of attacks.

Security Analysis of Continuous-Variable Measurement-Device-Independent Quantum Key Distribution Systems in Complex Communication Environments

Continuous-variable measure-device-independent quantum key distribution (CV-MDI QKD) is proposed to remove all imperfections originating from detection. However, there are still some inevitable imperfections in a practical CV-MDI QKD system. For example, there is a fluctuating channel transmittance in the complex communication environments. Here we investigate the security of the system under the effects of the fluctuating channel transmittance, where the transmittance is regarded as a fixed value related to communication distance in theory. We first discuss the parameter estimation in fluctuating channel transmittance based on these establishing of channel models, which has an obvious deviation compared with the estimated parameters in the ideal case. Then, we show the evaluated results when the channel transmittance respectively obeys the two-point distribution and the uniform distribution. In particular, the two distributions can be easily realized under the manipulation of eavesdroppers. Finally, we analyze the secret key rate of the system when the channel transmittance obeys the above distributions. The simulation analysis indicates that a slight fluctuation of the channel transmittance may seriously reduce the performance of the system, especially in the extreme asymmetric case. Furthermore, the communication between Alice, Bob and Charlie may be immediately interrupted. Therefore, eavesdroppers can manipulate the channel transmittance to complete a denial-of-service attack in a practical CV-MDI QKD system. To resist this attack, the Gaussian post-selection method can be exploited to calibrate the parameter estimation to reduce the deterioration of performance of the system.

On 6G Visions and Requirements

6G represents standardized communication systems that will be commercially available in 2030s. Even if the initial 5G networks, basing on the 3GPP Release 15, have hardly started become commercially available gradually as of 2019 and their large-scale deployment is still years away, industry is already keen to envision the justification and performance of the forthcoming generation. While there are no concrete 6G standards produced at this stage, their planning will benefit from realistic indications of the requirements and type of usage. The task is not straightforward as users, including a variety of verticals with their rather different communication environments, are sometimes not capable of expressing their future needs in technical terms nor industry might be able to prognosticate the demand that has not yet equivalence in preceding systems. This paper analyses some of the most important current visions of key standardization bodies and assesses indications of the industry for the potential requirements, service types, use cases, and architectural and functional models that can serve as a building block for the actual realization of the visions. This paper also presents means that can be applied in further interpretation and assessment of the vertical needs and priorities, with examples reflecting the benefits of Network Slice requirements that the GSMA North Americas Network Slicing Taskforce studied for foreseen near future environment and that may be extended to be utilized also in exploration of 6G requirements.

A Comparative Eye Tracking Study of Usability—Towards Sustainable Web Design

Websites are one of the most frequently used communication environments, and creating sustainable web designs should be an objective for all companies. Ensuring high usability is proving to be one of the main contributors to sustainable web design, reducing usage time, eliminating frustration and increasing satisfaction and retention. The present paper studies the usability of different website landing pages, seeking to identify the elements, structures and designs that increase usability. The study analyzed the behavior of 22 participants during their interaction with five different landing pages while they performed three tasks on the webpage and freely viewed each page for one minute. The stimuli were represented by five different banking websites, each of them presenting the task content in a different mode (text, image, symbol, graph, etc.).; the data obtained from the eye tracker (fixations location, order and duration, saccades, revisits of the same element, etc.), together with the data from the applied survey lead to interesting conclusions: the top, center and right sides of the webpage attract the most attention; the use of pictures depicting persons increase visibility; the scanpaths follow a vertical and horizontal direction; numerical data should be presented through graphs or tables. Even if a user's past experience influences their experience on a website, we show that the design of the webpage itself has a greater influence on webpage usability.

The Impact of Communication Media on Today’s Adolescents

The topical issue of the modern society, being the basis of these studies is that most adolescents aged 10 to 18 years spend all their free time surfing the web, in social networks, inter alia, which content can have a negative impact on the psycho-emotional state and cultural and moral values of young people. The objective of these studies is to create mechanisms to determine the impact of negative content of modern communication environments on adolescents, to develop a set of measures aimed at building positive cultural and moral values in adolescents and fostering positive behaviour patterns in the modern communication environment. The entire set of tasks as part of the studies was divided into two classes: technical and analytical ones. The technical tasks included the development, implementation and exploration of algorithms to create automated programs to perform the analysis of users’ social network page. Analytical tasks covered the determination of the impact level of the modern communication environment on young people under the age of 22, including school teenagers, as well as creation of a set of measures to support adolescents in difficult situations, while building positive cultural and moral values in young people and positive behaviour patterns for interaction in the modern communication environment.

Quantitative Analysis of Classroom Communication Environments for Learners With Deafblindness

Classroom environments were analyzed to better understand adult language modeling rates and whether teacher certification practices contributed to differences with learners with deafblindness (DB). Student characteristics were also examined in relation to communication rates. When there is a dual sensory loss, access to tactile and visual communication forms (i.e., multimodal) in addition to verbal communication is needed. Data were collected from 15 teacher–student dyads from four states through behavioral coding of videotaped language samples, teacher surveys, and the Communication Matrix assessment. Overall, teachers used verbal communication significantly more than additional classroom staff. Teachers in a state that required a severe/profound certification had significantly higher rates of overall communication, visual communication, and had students with higher communication levels.

White Lie of Persuasive Communication

The following is a personal manifesto of the state of 21st-century rhetoric. Rhetoric is so intrinsically bound into all aspects of life and all communication environments that it appears inevitable to communicate by using some form of rhetoric. Though, the ethical nature of rhetoric comes into question when we consider the ways rhetoric might be used for good and for evil. This article explores the ethical state of rhetoric today — what it should or shouldn't be, where rhetoric went right and where rhetoric may have gone wrong, and if the current rhetorical state is our reality, our dream, or our nightmare. First, by establishing rhetoric as a persuasive communication strategy that can be easily learned and both innocently and connivingly used, this article then explores if or how rhetoric can be used in "right" and/or "wrong" ways, and what this means for the present and future state of rhetoric. This article was written as an end of term paper in a classical and modern rhetoric course.

COVID-19 nationalism and the visual construction of sovereignty during China’s coronavirus crisis

This article explores how competing actors established, spread, and challenged visual representations of the Chinese nation during the COVID-19 pandemic. It asks: how do official gatekeepers of meaning in China imbue their visual construction of a crisis-hit nation with pathos?; and what happens when their critics utilize the resulting repertoire of visual cues for their own ends? To answer these questions, the article first examines the visual libraries of nationalism and national crisis from which Chinese propaganda drew during the COVID-19 outbreak. It then analyses the struggles that ensued over such representations, specifically the use of national flags and the sentiments they elicit. The analysis traces representations of the flag of the People’s Republic of China (PRC) from an initial satirical portrayal in a Danish broadsheet to the angry Chinese backlashes that followed on social media, and it shows how the tensions over such portrayals became part of a meme war over the sovereignty of Hong Kong. The analysis shows how representations of the nation can become a matter of existential anxieties during a time of crisis, especially in highly networked communication environments where authoritative official actors and their supporters are no longer in control of the symbols they established as part of their ‘emotional governance’.

FOREIGN LANGUAGE MOBILE LEARNING DESIGN

The formation of artificial virtual environments and their implementation in the educational environment of human activity is a current trend. Various textbooks, reference books, and dictionaries are created with virtual objects and interactive applications included in their content.The expanding capabilities and diversity of mobile devices support increasingly large-scale and interesting learningprojects.Mobile technologies provide new opportunities for curriculum development that differ from those provided by other e-learning technologies. They serve to support such a learning model, where the priorities are: free access to learning technologies, inclusiveness, and enhancing the students’ activity. In mobile learning, the central role is given to students with their individual technology preferences, while mobile learning is synonymous with unpredictability and constant change.Mobile-digital communication environments have huge number of tools and software to influence various cognitive and psychological aspects of students ' motivation to learn a foreign language. When using these environments, the learner's perceptual skills improve, since interaction with mobile devices with a learning purpose is most often initiated by the learner himself, at a convenient time and place for them.