Coarse synchronization of UWB signals in the dense multipath channel based on the golden section

In this paper we address the problem of coarse synchronization of ultra wideband signals in the dense multipath channel, following the widely used hypothesis testing approach in which the uncertainty region for the timing offset is divided into a certain number of cells. We propose a novel strategy for the search of the correct cells, within the constant increment perspective. We show that under a simple model the proposed strategy achieves practically the minimum possible mean acquisition time, independently of the length of the channel impulse response, as opposed to previous constant increment approaches. A comparative analysis of the proposed strategy and another convenient one reveals that, strictly speaking, none of them can be considered optimum from the point of view of the mean acquisition time. The proposed method is advantageous from the point of view of computational complexity in the general case. Simulations with a realistic channel model confirm that the proposed strategy is very appropriate for the problem of coarse synchronization of UWB signals.     

Knowledge management in the voluntary sector: a focus on sharing project know-how and expertise

Voluntary sector organisations are operated principally by volunteers who are not obliged to share their knowledge, as might be expected in a for-profit company, with a greater consequent loss of knowledge should individuals leave. This research examines how a volunteer-led organisation, the Campaign for Real Ale (CAMRA), acquires, stores and shares its project knowledge in the context of event management. Three annual CAMRA festivals of different sizes and maturity were selected to see how volunteers’ knowledge is managed in the process of organising their festivals. Key Festival Officers were interviewed and focus groups, comprising of festival volunteers, were conducted. While the maturity of a festival and its size seemed to influence the ways in which knowledge was managed there were some commonalities between festivals. Evident was a strong master-apprentice model of learning with little formal training or record keeping except, that is, where legislation and accountability in treasury and health and safety functions were necessary. Trust between volunteers and their need to know and to share information appeared to be dependent, in part, on their perception and confidence in the success of the overarching project organisation, and this helped shape volunteers’ knowledge-sharing practices. While there was evidence of a laissez-faire approach to codification and the sharing of knowledge, this was less so when volunteers recognised a genuine lack of knowledge, which would hinder the success of their festival. The analysis also highlighted factors related to the sharing of knowledge that, it is suggested, have not been identified in the for-profit sector.     

Reconstituting the ADHD girl: accomplishing exclusion and solidifying a biomedical identity in an ADHD class

In this study, we explore what happens to young people labelled as having attention deficit hyperactivity disorder (ADHD) after they have been excluded from mainstream class and placed in a special class. More specifically, we focus on how a specific disability identity is locally accomplished and ascribed to a girl placed in an ADHD class containing only boys. Data are drawn from the communication books that regularly passed between the parents and teachers, and from ethnographic work in a special class for children aged 7–12 years diagnosed with ADHD, during a period of one school year. We draw on ethnomethodology, especially membership categorisation analysis, when investigating unfolding trajectories of shifting identifications during a school year. The detailed analysis reveals that the girl is accomplished as capable of managing her life in school at the beginning of the year, but by the end is constructed as disabled and identified as a typical ADHD girl in very subtle ways in the teacher's communication with the parents. Furthermore, our analysis highlights how the process of exclusion and social identification of the girl as a typical ADHD girl is mutually constructed and achieved across classroom activities in everyday schooling contexts.     

How to feel about emotionalized artificial intelligence? When robot pets,holograms, and chatbots become affective partners

Ethics and Information Technology - Interactions between humans and machines that include artificial intelligence are increasingly common in nearly all areas of life. Meanwhile, AI-products are...     

Leaving the classroom: a didactic framework for education in environmental sciences

In Continuous Education curricula in Spain, the programs on sciences of the environment are aimed toward understandings of sustainability. Teaching practice rarely leaves the classroom for outdoor field studies. At the same time, teaching practice is generally focused on examples of how human activities are harmful for ecosystems. From a pedagogic point of view, it is less effective to teach environmental science with negative examples such as catastrophe, tragedy, and crisis. Rather, teaching environmental sciences and sustainable development might be focused on positive human-environment relationships, which is both important for the further development of students and educators. Within rural settings, there are many such examples of positive relationships that can be emphasized and integrated into the curriculum. In this article, we propose teaching environmental sciences through immersion in rural cultural life. We discuss how fieldwork serves as a learning methodology. When students are engaged through research with traditional cultural practices of environmental management, which is a part of the real and traditional culture of a region, they better understand how positive pedagogy instead of pedagogy structured around how not-to-do examples, can be used to stimulate the interactions between humans and the environment with their students. In this way, cultural goods serve as teaching resources in science and environmental education. What we present is authentic cases where adults involved in a course of Continuous Education explore ‘environmentally-friendly’ practices of traditional agriculture in Asturias (north of Spain), employing methodologies of cultural studies.     

The Learning Intention of Low-Qualified Employees: A Key for Participation in Lifelong Learning and Continuous Training

In our continuously changing society, a need for updating one’s skills and knowledge puts pressure on safeguarding the labour market position of low-qualified employees. However, prior research and official statistics show that employees with a lower level of education tend to participate less in training than highly-educated individuals. This limited participation is associated with employers offering fewer opportunities to low-qualified employees, but also with the fact that low-qualified employees themselves might be less willing to participate. In other words, their learning intentions are assumed to be weaker and more restricted than the learning intentions of highly-educated employees. The article reports on a quantitative survey research on the learning intentions of 406 low-qualified employees. The results showed that employees who participated in formal job-related learning activities during the last 5 years had a stronger learning intention than those who did not. Next, the results of the stepwise regression showed that self-directedness, financial benefits, self-efficacy, and autonomy were significant positive predictors of the learning intentions of low-qualified employees. Also, the limited number of possibilities or opportunities to learn was not significant. The results indicated that a learning intention can lead towards the participation in learning activities, but participation is not merely initiated by offering opportunities for learning. Organisational aspects such as job autonomy and financial benefits can stimulate the learning intention of an employee. Finally, regarding the socio-demographic variables, only limited differences were found. In short, employees with no educational qualifications and a full-time contract had the lowest intention to learn.     

Young refugees’ and asylum seekers’ career choices: a qualitative investigation

International Journal for Educational and Vocational Guidance - A major challenge for refugees and asylum seekers is social and professional integration. Using constructivist and capability...     

Preference for talented naturals over hard workers emerges in childhood and shapes behavior

Both talent and effort are considered essential sources of achievement, but past research suggests a preference for people who appear to achieve through talent. This research examined the potential naturalness preference in 306 Chinese children (M_age: 6.12 years; 164 girls) and 352 adults (M_age: 19.87 years; 182 women) in 2019. In Study 1, participants evaluated a natural or striver protagonist of equal achievement. Children attributed greater competence and warmth to naturals than strivers; adults exhibited this preference only when attributing competence. In Study 2, participants indicated their behavioral preferences between the two protagonists. Children, but not adults, interacted more with naturals than strivers. These findings indicate the naturalness preference emerges early (ds ≥ .27) but declines in strength over time.