ORCID Profile
0000-0001-5048-817X
Current Organisations
University of Wollongong
,
Australian Education Research Organisation
,
Macquarie University
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Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-06-2022
Publisher: SAGE Publications
Date: 29-08-2019
Abstract: Digital technologies are increasingly prevalent and can complement more traditional resources to support children’s investigations and explorations in early learning contexts. A new consideration is the value of technology in positioning early childhood educators as co-learners and co-investigators alongside children. This article presents findings from a case study undertaken with two early childhood educators working with a class of preschool-aged children. The participating educators engaged in a practitioner inquiry project focusing on how technology could support and extend children’s interest in outer space and the solar system. This study found that digital technology supported educators and children to work as co-investigators, moving between the roles of apprentice and expert as they shared pre-existing understandings and sought new knowledge. In addition, digital and non-digital resources were used contemporaneously to support investigation in their ongoing project. The findings provided clear ex les of technology as an integrated, complementary resource in play-based learning, supporting children’s agency as they worked with educators to increase scientific knowledge as well as digital handling skills.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 02-2014
Publisher: Informa UK Limited
Date: 26-11-2022
Publisher: SAGE Publications
Date: 20-04-2023
DOI: 10.1177/14639491231166487
Abstract: This article reports on a study investigating how 13 young children in English-speaking countries (England, Scotland, Australia and the USA) watch and engage with digital content on YouTube and YouTube Kids. Given the increasing amount of time children spend viewing these platforms, and related concerns around the commercial algorithms that direct their viewing choices, the research aims were to understand how young children make choices about what to watch, and to explore the extent of their comprehension of the constructed, ‘unreal’ nature that characterises a large proportion of these videos, particularly those presented by children (micro-celebrities). Using child-centred methodologies, the research was carried out by parent-researchers, and the findings were analysed and interpreted using elements of Baudrillard's theory of hyperreality. The study found that the children selected videos for a variety of reasons, including those related to their ‘real-life’ interests, and were largely able to discern between the real and the hyperreal in videos by drawing on existing frames of reference and applying their developing knowledge and understanding of the world. The article provides insights into young children’s experiences, understandings and preferences around using YouTube and YouTube Kids, and extends Baudrillard’s perspectives on the hyperreal from postmodernism into a post-digital conceptual realm.
Publisher: SAGE Publications
Date: 12-11-2022
DOI: 10.1177/1476718X211052785
Abstract: The first 3 years of life are identified as a period where children are primed for mathematical thinking, and a time where significant and critical development occurs. Additionally, mathematical ability in the years before children start school serves as a strong predictor of later achievement. However, many early childhood educators do not recognise the relevance of focussing on numeracy with very young children, and there remains a paucity of research on mathematical thinking and learning with infant and toddler aged children. This study sought to investigate early childhood educators’ perspectives on mathematics for children birth to 5 years of age. Educators were invited to complete an online survey and a mixed methods approach was used to interpret the responses. The findings revealed that even though mathematics was seen as relevant and important across the birth to five age range, these values were not significantly reflected in educator’s preferred or espoused teaching practices. The study also identified a range of factors that positively and negatively influenced educator self-efficacy and dispositions towards mathematics across their lifespans. Practitioner led research projects are suggested as an effective form of professional learning to incorporate into future research projects.
Publisher: SAGE Publications Ltd
Date: 2019
Publisher: MDPI AG
Date: 25-11-2022
DOI: 10.3390/NU14235009
Abstract: Despite the available literature on the consequences of night shiftwork on stress and food intake, its impact on leptin and ghrelin has never been studied. We previously demonstrated that leptin and ghrelin were biomarkers related to stress, and acute stress-induced a decrease in leptin levels and an increase in ghrelin levels. We performed a prospective observational study to assess the influence of night work, nutrition, and stress on the levels of ghrelin and leptin among emergency healthcare workers (HCWs). We took salivary s les at the beginning of a day shift and/or at the end of a night shift. We also monitored stress using the job demand-control-support model of Karasek. We recorded 24-h food intake during the day shift and the consecutive night shift and during night work and the day before. We included 161 emergency HCWs. Emergency HCWs had a tendency for decreased levels of leptin following the night shift compared to before the dayshift (p = 0.067). Furthermore, the main factors explaining the decrease in leptin levels were an increase in job-demand (coefficient −54.1, 95 CI −99.0 to −0.92) and a decrease in job control (−24.9, −49.5 to −0.29). Despite no significant changes in ghrelin levels between shifts, social support was the main factor explaining the increase in ghrelin (6.12, 0.74 to 11.5). Food intake (kcal) also had a negative impact on leptin levels, in addition to age. Ghrelin levels also decreased with body mass index, while age had the opposite effect. In conclusion, we confirmed that ghrelin and leptin as biomarkers of stress were directly linked to the job demand-control-support model of Karasek, when the main cofounders were considered.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-02-2021
Publisher: Optica Publishing Group
Date: 24-12-2021
DOI: 10.1364/JOCN.403485
Abstract: Optical wireless access networks have seen rapid progress. With beam-steering capability, optical wireless communications can deliver very high capacity, support user mobility with indoor localization supported directly at the optical layer, be resilient against the blocking of beams by exploiting spatial ersity at the optical layer, and guarantee low-latency links with modified protocols and network architectures. This paper presents a review of recent progress in achieving functions of communication, localization, resiliency, and dynamic networking using optical-layer techniques.
Publisher: Optica Publishing Group
Date: 24-01-2022
DOI: 10.1364/JOCN.440798
Abstract: The exponential growth of erse smart mobile applications such as smart monitoring, holograms, and autonomous vehicles are driving mobile technologies toward a more intelligent and software-defined communication system. This growing demand has led to the next giant leap in next-generation wireless communication technology, i.e., sixth-generation (6G) mobile technology, which anticipates providing 1 Tbps data rates and ultralow latency over ubiquitous 3D coverage areas. However, the transport network, which connects hundreds of thousands of cell sites and the network core to enable intelligence, virtualization, and other key features of 6G, has not advanced enough to cater the dense cell deployment expected in future 6G networks. Because many aspects of 6G remain undefined, this provides us with the opportunity to take optical transport networks into design consideration to realize the benefits that 6G has to offer. To this end, in this paper, we present a comprehensive view on the role of optical access networks in supporting fourth-generation (4G), fifth-generation (5G), and beyond wireless technologies. In particular, we discuss design and deployment strategies and their challenges when using optical access as a transport solution during the evolution of wireless access technologies. For this purpose, we first identify how an optical access network is used to support high-capacity transport networks in 4G, followed by the challenges that 5G brought into optical transport networks and its erse solutions. We conclude the paper by providing insights into how an optical transport network can be designed to support 6G.
Publisher: Optica Publishing Group
Date: 23-05-2022
DOI: 10.1364/OE.458691
Abstract: In this paper, we propose a novel beam shaping technique based on orbital angular momentum (OAM) modes for indoor optical wireless communications (OWC). Furthermore, we investigate two spatial ersity techniques, namely repetition-coding (RC) and Alamouti-type orthogonal space-time-block-coding (STBC) for indoor OWC employing the new beam shaping technique. The performance of both ersity schemes is systematically analyzed and compared under different beam shaping techniques using different OAM modes with different power ratios of the modes. It is shown that both RC and STBC can improve the system performance and effective coverage and RC outperforms STBC in all the beam shaping techniques regardless of the power ratios of the different modes. In addition, to further understand the performance of RC and STBC schemes against the signal delays induced during OAM mode conversion, the system tolerance of the two schemes to the delay interval is investigated with different OAM mode-based beam shaping techniques. Numerical results show that higher resistance to the delay interval can be achieved in STBC scheme. The advantage is more obvious when employing OAM 0 and OAM 1 based beam shaping technique.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2022
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 12-2020
Publisher: Wiley
Date: 09-2018
DOI: 10.1111/BJET.12664
Publisher: Optica Publishing Group
Date: 21-08-2023
DOI: 10.1364/JOCN.492334
Abstract: Sixth generation (6G) wireless technology, which is the next giant leap in the evolution of wireless communication, has been gaining great interest from academia, industry, and the general public due to its capabilities and the applications that are expected to be supported. Optical x-haul is becoming increasingly important as a key element of the 6G ecosystem due to the increasing demand for high data rates and low latency with the emergence of new 6G applications and use cases. The ability of optical x-haul to support high data rates and low latency along with its scalability and high-reliability performance makes it an essential transport technology for future wireless networks of 6G and beyond. However, optical and wireless technologies operate in different domains and with different standards. Therefore, integration of optical x-haul and 6G needs careful consideration with emphasis on bringing network intelligence softwarization. This is particularly important in supporting the quality of service requirements of emerging applications in the most cost-effective and sustainable manner. To this end, this paper reviews the research that has been carried out in the investigation of the optical x-haul network in a hybrid fiber–wireless system to cater to the next generation of wireless networks. Especially, we review the research carried out in open radio access network architecture, coordination functionalities in radio-over-fiber networks, optimization frameworks that can be used to jointly optimize wireless and optical network deployments, and reconfigurable optical x-haul. We conclude the paper by providing insights into research challenges that we need to overcome in integrating optical x-haul in the 6G ecosystem to support emerging applications.
Publisher: Optica Publishing Group
Date: 24-10-2013
DOI: 10.1364/JOCN.405506
Abstract: With the stringent requirements of fifth-generation and beyond wireless communications technology coupled with the potential bottleneck in the optical fronthaul, radio-over-fiber (RoF) technology offers an alternative solution to distribute the wireless signals while meeting these requirements. The inherent centralized architecture of RoF enables advanced coordination functionality to be performed within the fronthaul network. Advanced coordination functionality such as non-orthogonal multiple access (NOMA) has gained traction as a means to improve spectral efficiency for larger user-base networks. Among various NOMA implementations, the recently proposed multilevel code (MLC) was found to be superior to the commonly investigated superposition coding successive interference cancellation scheme in a two-user scenario. In this paper, we generalize the definition of the MLC to n user cases and discuss two power allocation schemes for the generalized MLC definition, which are based on the spectral efficiency (SE) criterion and symbol error rate (SER) criterion, respectively. Simulation-based performance analysis on the MLC–SE and the MLC–SER schemes was conducted over different cluster sizes and randomly generated user distributions. The results show, to the best of our knowledge, that the best performance in terms of user fairness and bit error rate can be obtained in a two-user MLC–SER scheme.
Publisher: Informa UK Limited
Date: 03-08-2020
Publisher: Optica Publishing Group
Date: 15-01-2021
DOI: 10.1364/OSAC.413709
Abstract: The CMY colour camera is different from the RGB counterpart where the subtractive colours cyan, magenta and yellow are used. The CMY camera performs better than an RGB camera in low light conditions. However, conventional CMY colour filter technology made of pigments and dyes are limited in performance for next generation image sensors with submicron pixel sizes. This is because the conventional CMY filters cannot be fabricated in nanoscale as they use their absorption properties to subtract colours. This paper presents a CMOS compatible nanoscale thick CMY colour mosaic made of Al-TiO 2 -Al nanorods forming a total number of 0.82 million colour filter pixels with each filter pixel size of 4.4 µm arranged in a CMYM pattern. The colour mosaic was then integrated on a MT9P031 image sensor to make a CMY camera and colour imaging is demonstrated using a 12 colour Macbeth chart. The developed technology will have applications in astronomy, low exposure time imaging in biology, and photography.
Publisher: MDPI AG
Date: 16-02-2022
DOI: 10.3390/NU14040829
Abstract: Despite the consequences of night-shift work, the diet of night-shift workers has not been widely studied. To date, there are no studies related to food intake among emergency healthcare workers (HCWs). We performed a prospective observational study to assess the influence of night work on the diet of emergency HCWs. We monitored 24-h food intake during a day shift and the consecutive night, and during night work and the daytime beforehand. We analyzed 184 emergency HCWs’ food intakes. Emergency HCWs had 14.7% lower (−206 kcal) of their 24-h energy intake during night shifts compared to their day-shift colleagues (1606.7 ± 748.2 vs. 1400.4 ± 708.3 kcal, p = 0.049) and a 16.7% decrease in water consumption (1451.4 ± 496.8 vs. 1208.3 ± 513.9 mL/day, p = 0.010). Compared to day shifts, night-shift had 8.7% lower carbohydrates, 17.6% proteins, and 18.7% lipids. During the night shift the proportion of emergency HCWs who did not drink for 4 h, 8 h and 12 h increased by 20.5%, 17.5%, and 9.1%, respectively. For those who did not eat for 4 h, 8 h and 12 h increased by 46.8%, 27.7%, and 17.7%, respectively. A night shift has a huge negative impact on both the amount and quality of nutrients consumed by emergency healthcare workers.
Publisher: IOP Publishing
Date: 21-08-2023
Abstract: This study introduces a novel theoretical framework for detecting and decoding wireless communication signals in the nanoscale range operating at terahertz (THz) frequencies. Initially, we investigate the Floquet states in a dressed 2D semiconductor quantum well and derive an analytical expression to determine its longitudinal conductivity. The results indicate that the longitudinal conductivity of a dressed 2D semiconductor can be tailored to specific requirements by manipulating the frequency of the external dressing field. Furthermore, carefully selecting the intensity and polarization type of the external dressing field enables fine-tuning and optimization of the conductivity. To evaluate the effectiveness of each dressing field configuration, we present a figure of Merit (FoM) assessment that determines the maximum possible change in conductivity within the considered frequency range. The proposed theory introduces a mechanism capable of identifying frequency-modulated communication signals in the THz range and performing frequency demodulation. We comprehensively analyze of the demodulator’s transfer function in the receiver. Consequently, we establish that the transfer function exhibits linear behavior over a specific frequency range, rendering it suitable for frequency demodulation. Finally, we provide a numerical illustration of a frequency demodulation scenario. The breakthrough uncovered in this study opens up possibilities for the development of high-efficiency, lightweight, and cutting-edge chip-scale wireless communication devices, circuits, and components.
Publisher: MDPI AG
Date: 28-09-2021
Abstract: For many families, young children’s engagement with screen-based technology is an ongoing concern in terms of physical, social and cognitive development. They are uneasy with the difficulty children have disengaging from screens and concerned that this behavior is obsessive or a sign of addiction. However, technology is recognized as having a “rightful role” in early childhood contexts. This scoping paper reports on a review of literature relating to digital play for children aged birth to five years, with the aim of further understanding digital wellbeing. Csikszentmihalyi’s flow theory serves as a theoretical framework for understanding why many young children enjoy digital play and become deeply engaged, with a disconnect between how young children and adults perceive digital play. Concerns about children’s deep immersion with digital play are interrogated to understand the connections with perceived addictive traits. The review highlights the critical importance of supporting children’s agency and digital citizenship skills from a young age, including the ability to critique content, balance screen-time with non-screen time and to develop self-control and self-regulation as a means to promote long-term positive outcomes for children in their digital lifeworlds and beyond.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-02-2023
Publisher: Informa UK Limited
Date: 28-12-2022
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-04-2021
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-10-2023
Publisher: Optica Publishing Group
Date: 12-07-2021
DOI: 10.1364/JOCN.426215
Abstract: Ultra-high-capacity indoor wireless connectivity is considered a key technology enabler to support end-to-end delivery of new services in the beyond-5G and 6G era. With physical layer data rates well beyond 10 Gbps, optical wireless communication (OWC) technology is positioning itself as a prospective candidate to support these services. While OWC is capable of handling multi-gigabit data rates in the wireless domain, the underlying distribution network architecture is not designed to transport the projected high volumes of data as well as the expected added complexity of managing and coordinating multiple narrow beams, beamsteering, and femto cells. To future proof wireless local area networks (LANs) including those using the radio spectrum, we propose a universal network architecture that features centralized software/hardware resource pools as well as control and data plane separation in conjunction with virtualization support and a high-capacity fiber distribution network. Such an architecture has the potential to realize interoperability between existing and future high-capacity wireless LAN technologies such as Wi-Fi 6 and Wi-Fi in the 60 GHz range, as well as dynamic and flexible allocation of resources in response to changing user bandwidth demand. Our results demonstrate the benefits of the universal network architecture in supporting high throughput performance, low delay, and increased resiliency.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-12-2022
Publisher: Informa UK Limited
Date: 03-07-2019
No related grants have been discovered for Kelly Johnston.