Search results for "PPI"
showing 10 items of 7396 documents
IEEE Access Special Section Editorial: Exploiting the Benefits of Interference in Wireless Networks: Energy Harvesting and Security
2018
Interference used to be viewed as a harmful factor in wireless networks, which can reduce the quality of information transmission. To combat against interference, many interference management techniques have emerged. Due to the latest research advances, interference (or noise) can also be exploited to offer some benefits to wireless networks. The first aspect is that interference in multi-user networks can be collected as a green power supply for the transceivers, known as wireless energy harvesting. Another application is that one can generate artificial noise to disrupt the adversarial eavesdropping, and guarantee the security of wireless networks. Therefore, conventional interference man…
Trajectory Design and Resource Allocation for Multi-UAV Networks : Deep Reinforcement Learning Approaches
2023
The future mobile communication system is expected to provide ubiquitous connectivity and unprecedented services over billions of devices. The unmanned aerial vehicle (UAV), which is prominent in its flexibility and low cost, emerges as a significant network entity to realize such ambitious targets. In this work, novel machine learning-based trajectory design and resource allocation schemes are presented for a multi-UAV communications system. In the considered system, the UAVs act as aerial Base Stations (BSs) and provide ubiquitous coverage. In particular, with the objective to maximize the system utility over all served users, a joint user association, power allocation and trajectory desi…
Precision Agriculture: Past, Present and Future
2011
From 1978 the Global Positioning System, needed for sensing the position of military targets (e.g. buildings, machinery), was developed as a pure military system, while in 1983 it was made available also for public use. Therefore, at the beginning of 80s precision agriculture, requiring GPS for sensing the position to which any measured field parameter must be geo-referenced, was implemented for the first time in US. In fact, soil and crop parameters are spatially variable in a field, so that spatially uniform rate crop input applications cause increased environmental impact and crop input waste. In order to reduce the environmental impact and optimise the use of crop inputs, precision agri…
Processi di word-formation: clipping, blending, abbreviation
2009
Il libro analizza i diversi processi di formazione delle parole nel linguaggio economico inglese
Teachers’ occupational well-being in relation to teacher–student interactions at the lower secondary school level
2023
This study investigated the relation between teachers’ occupational well-being and the quality of teacher–student interactions in lower secondary schools in Finland. Teachers (N = 48) self-rated their occupational well-being in terms of engagement, stress, job demands, and emotional exhaustion. Teacher–student interactions in classrooms were video-recorded and coded with the Classroom Assessment Scoring System. The results of multivariate regression analyses showed that teachers who reported higher work-related stress were observed with a lower quality of emotional support, classroom organization, and instructional support when controlling for background factors. It is proposed that the obs…
The Interplay of Compassion, Subjective Happiness and Proactive Strategies on Kindergarten Teachers’ Work Engagement and Perceived Working Environmen…
2020
Background: The current cross-sectional study examines a model that was designed to advance understanding of the interplay between compassion towards teachers expressed by teaching colleagues, subjective happiness, proactive strategies and kindergarten teachers&rsquo
Reciprocal associations among teacher-child interactions, teachers' work engagement, and children's social competence
2023
This study aimed at examining reciprocal associations among teacher–child interactions, teachers' work engagement, and children's social competence across grade 1. The participants were 51 Finnish teachers and 815 children. The quality of teacher–child interactions (emotional support, classroom organization, and instructional support) was assessed with the Classroom Assessment Scoring System. In addition, teachers reported their work engagement and rated children's social competence (prosocial and antisocial behaviors). The results of the multilevel modeling indicated that high-quality instructional support was associated with more prosocial and less antisocial behavior. Prosocial behavior …
Finnish Police Supervisors’ Conceptions of Workplace Learning and Its Sustainability
2023
Workplace learning (WPL) is a complex phenomenon involving the intertwined processes of working and learning. Recent studies have shown the importance of sustainable perspectives in WPL situations. In the literature, sustainable development is still predominantly referred to environmental, economic and social sustainability. In this study, sustainable perspectives denote the widespread use of previous knowledge, the rapid application of new knowledge and the effects of this knowledge on well-being, thus leaning on human sustainability. The purpose of this study is to examine conceptions of WPL among Finnish police supervisors and to reveal whether sustainable learning perspectives manifest.…
Pathways to better writing practices in foreign language teaching : an analysis of writing exercises in an English course book used in a migrant class
2012
Tässä työssä tutkin oppikirjaa, joka on käytössä yläkoulussa, mutta ei ole alun perin laadittu peruskoulua varten. Kirjaa käytetään yläkoulussa alkavan englannin opetuksessa. Käytännössä kaikki oppilaat näissä ryhmissä ovat maahanmuuttajataustaisia. Työssäni analysoin oppikirjan kirjallisia harjoituksia ja teoreettisena pohjana analyysilleni on tekstitaitojen (literacy) näkeminen sosiokognitiivisena prosessina, jossa korostuvat sekä kontekstin että merkityksellisen kommunikaation tärkeys. Samat asiat ovat perustana sekä Perusopetuksen opetussuunnitelman perusteissa (POPS) että Eurooppalaisessa viitekehyksessä (EVK). Luokitus, jonka olen laatinut harjoitusten analysointia varten, perustuu te…