207,769 research outputs found
Helping children think: Gaze aversion and teaching
No full textLooking away from an interlocutor's face during demanding cognitive activity can help adults answer challenging arithmetic and verbal-reasoning questions (Glenberg, Schroeder, & Robertson, 1998). However, such `gaze aversion' (GA) is poorly applied by 5-year-old school children (Doherty-Sneddon, Bruce, Bonner, Longbotham, & Doyle, 2002). In Experiment 1 we trained ten 5-year-old children to use GA while thinking about answers to questions. This trained group performed significantly better on challenging questions compared with 10 controls given no GA training. In Experiment 2 we found significant and monotonic age-related increments in spontaneous use of GA across three cohorts of ten 5-year-old school children (mean ages: 5;02, 5;06 and 5;08). Teaching and encouraging GA during challenging cognitive activity promises to be invaluable in promoting learning, particularly during early primary years
Doherty Residence
No full textDrawing from a set of 3 sheets of measured drawings of the Doherty residence project, showing four elevations.Pencil on vellu
A Highly Linear Wideband Polar Class-E CMOS Digital Doherty Power Amplifier
No full textThis article presents the first application of a digital-intensive intrinsically linear digitally controlled class-E technique in a Doherty configuration. By careful nonlinear segmentation and multiphase RF-clocking along with overdrive-voltage control and automatic duty-cycle correction, it is shown that even the nonlinearities related to Doherty operation can be fully handled by the underlying design such that digital predistorion (DPD) can be, in principle, omitted. The nonlinearity behavior of the whole digital Doherty power amplifier (PA) is analyzed, and closed-form equations are given to predict the AM-AM and AM-phase modulation (PM) curves. In addition, time/phase mismatch between the peak and main branches and the AM and PM signals is accurately compensated. In order to achieve the maximum intrinsic linearity, two separate chips with the same architecture, but different design parameters, are fabricated as the main and peak amplifiers in 40-nm bulk CMOS. To achieve a large RF bandwidth and high passive combiner efficiency, a differential low-loss, wideband Marchand balun-based Doherty power combiner, implemented using reentrant coupled lines with independent second-harmonic control is proposed, and together with the matching network is fabricated on a two-layer PCB. The measured peak/6-dB power backoff P OUT, drain efficiency/power-added efficiency at 2.4 GHz are 17.5 dBm/12.2 dBm, 57%/52% and 36%/25% with VDD main/peak = 0.6 V/0.7 V. Measured results without using DPD show -41-dBc adjacent channel power ratio (ACPR) and -36-dB error vector magnitude (EVM) for a 16-MHz OFDM signal at 2.5 GHz. By using DPD, the measured ACPR and EVM of a 16-MHz/32-MHz OFDM signals are -52 dBc/-48 dBc and -50 dB/-48 dB, respectively.Accepted author manuscriptElectronic
A Millimeter-Wave CMOS Series-Doherty Power Amplifier With Post-Silicon Inter-Stage Passive Validation
No full textThis article presents a wideband series-Doherty power amplifier (SDPA) for millimeter-wave (mm-wave) fifth-generation (5G) applications. It features a compact two-step impedance inverting-based series-Doherty power combiner that provides broadband close-to-perfect power back-off (PBO) efficiency enhancement. The amplitude-to-amplitude (AM-AM)/amplitude-to-phase (AM-PM) performance of the load-modulated Doherty power amplifier for broadband operation is analyzed. We also devise a post-silicon inter-stage passive validation (PSIV) approach to evaluate the mm-wave chip prototype utilizing the embedded voltage root mean square detectors. The proposed SDPA is realized in a 40-nm bulk CMOS, and it delivers 20.4 dBm PSAT with 39.1%/34% PAE at 0-/6-dB PBO. Over a 23.5-30 GHz band, its PAE is >24% at 6-dB PBO. At 27 GHz, applying a '2 GHz 16-quadratic-amplitude modulation (QAM) orthogonal frequency-division multiplexing (OFDM)' signal, the proposed SDPA generates 10.2 dBm average power with 18.9% average PAE. The average error vector magnitude is better than -24.5 dB without digital predistortion for a '400-MHz 64-QAM OFDM' signal while generating an average output power of 8.8 dBm with 15% PAE. The AM-AM/AM-PM of the realized SDPA is investigated by employing a '50-MHz 64-QAM OFDM' signal, validating our analysis and showing that the linearity limitation of DPAs is systematic and predictable. Utilizing the proposed PSIV approach, the frequency response of the input/inter-stage passive circuits is measured, indicating an excellent agreement with 3-D electromagnetic (EM) simulation results.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic
Autistic doctors: leveraging insider perspectives to improve healthcare for autistic people
No full textoai:openresearch.lsbu.ac.uk:99098Autistic people experience poor healthcare outcomes and reduced life expectancy compared to non-autistic people. Recognition that doctors can be autistic is recent. This thesis presents the first ever series of publications by openly autistic medical doctors, with the intention being to explore the experiences of autistic doctors, and to improve healthcare and quality of life for autistic people. Alongside four original research papers relating to autism, healthcare, and autistic healthcare providers, I present an educational framework which offers a potential solution to the problems identified in my research. Utilising our insider positioning as both autistic people and medical doctors, we leverage our knowledge and perspectives on medicine and medical education to pitch this Autistic SPACE framework to be as accessible as possible to non-specialist medical colleagues. • Doherty M, Neilson S, O’Sullivan J, Carravallah L, Johnson M, Cullen W, Shaw SCK. Barriers to healthcare and self-reported adverse outcomes for autistic adults: a cross-sectional study. BMJOpen. 2022;12:e056904. • Shaw SCK, Carravallah L, Johnson M, O’Sullivan J, Chown N, Neilson S, Doherty M. Barriers to healthcare and a ‘triple empathy problem’ may lead to adverse outcomes for autistic adults: a qualitative study. Autism. 2024;28(7):1746-57. • Doherty M, McCowan S, Shaw SCK. Autistic SPACE: a novel framework for meeting the needs of autistic people in healthcare settings. British Journal of Hospital Medicine. 2023;84(4):1-9. • Shaw SCK, Fossi A, Carravallah LA, Rabenstein K, Ross W, Doherty M. The experiences of autistic doctors: a cross-sectional study. Frontiers in Psychiatry. 2023;14:1160994 • Doherty M, Chown N, Martin N, Shaw SCK. Autistic psychiatrists’ experiences of recognising themselves and others as autistic: qualitative study. BJPsych Open. 2024;DOI: 10.1192/bjo.2024.756). The overarching goal of my work is to increase awareness of neurodiversity in medicine and improve healthcare provision and outcomes for autistic people
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