Are there sleep-specific phenotypes in patients with chronic fatigue syndrome? A cross-sectional polysomnography analysis

Objectives: Despite sleep disturbances being a central complaint in patients with chronic fatigue syndrome (CFS), evidence of objective sleep abnormalities from over 30 studies is inconsistent. The present study aimed to identify whether sleep-specific phenotypes exist in CFS and explore objective characteristics that could differentiate phenotypes, while also being relevant to routine clinical practice. Design: A cross-sectional, single-site study. Setting: A fatigue clinic in the Netherlands. Participants: A consecutive series of 343 patients meeting the criteria for CFS, according to the Fukuda definition. Measures: Patients underwent a single night of polysomnography (all-night recording of EEG, electromyography, electrooculography, ECG and respiration) that was hand-scored by a researcher blind to diagnosis and patient history. Results: Of the 343 patients, 104 (30.3%) were identified with a Primary Sleep Disorder explaining their diagnosis. A hierarchical cluster analysis on the remaining 239 patients resulted in four sleep phenotypes being identified at saturation. Of the 239 patients, 89.1% met quantitative criteria for at least one objective sleep problem. A one-way analysis of variance confirmed distinct sleep profiles for each sleep phenotype. Relatively longer sleep onset latencies, longer Rapid Eye Movement (REM) latencies and smaller percentages of both stage 2 and REM characterised the first phenotype. The second phenotype was characterised by more frequent arousals per hour. The third phenotype was characterised by a longer Total Sleep Time, shorter REM Latencies, and a higher percentage of REM and lower percentage of wake time. The final phenotype had the shortest Total Sleep Time and the highest percentage of wake time and wake after sleep onset. Conclusions: The results highlight the need to routinely screen for Primary Sleep Disorders in clinical practice and tailor sleep interventions, based on phenotype, to patients presenting with CFS. The results are discussed in terms of matching patients’ self-reported sleep to these phenotypes in clinical practice

Brains Unlimited: Giftedness and Gifted Education in Canada before Sputnik (1957)

This study’s purpose is to sketch, using the historical method, the development of ideas about giftedness and programs for gifted children in Canadian schools, from the nineteenth century to the launch of the Soviet satellite Sputnik in 1957 that reignited interest in gifted education. The author notes that historians have paid scant attention to giftedness. The author argues that giftedness and gifted education in Canada developed in three historical phases prior to 1957. Rationales for gifted education today are discussed in light of the historical legacy

Adaptive Transmission Protocols for Wireless Communication Systems with Fountain Coding

We present low-complexity adaptive protocols for both unicast and multicast transmission in wireless communication systems that employ higher layer fountain codes. Our adaptive protocols respond to variations in channel conditions by adapting the modulation and channel coding of transmitted packets, and they provide efficient communication over wireless channels that experience fading, shadowing, and other time-varying propagation losses. The operation of our protocols is governed by simple receiver statistics that can be obtained during the demodulation of received packets. We present three adaptive protocols for fountain-coded unicast transmission, and compare the throughput performance of our protocols with that of fixed-rate systems, as well as hypothetical ideal protocols that are given perfect channel state information and use ideal fountain codes. We also present two adaptive protocols for fountain-coded multicast transmission. Our adaptive multicast transmission protocols operate with limited feedback from the destinations and provide scheduling to avoid collisions among the feedback messages. We compare the performance of our multicast protocols to systems with fixed modulation and coding, as well as hypothetical protocols that are given perfect channel state information. We demonstrate that our practical adaptive protocols for fountain-coded unicast and multicast transmission outperform fixed-rate coding schemes and provide throughput that is nearly as high as that achieved by hypothetical protocols that are given perfect channel state information

The Theory of Special Education and the Necessity of Historicizing: A Multilogue Response to Benjamin Kelsey Kearl and Donald Warren

Jason Ellis responds to Benjamin Kelsey Kearl and Donald Warren\u27s discussion of the use of philosophy in the history of special education

EFFECTS OF PHASE AND AMPLITUDE ERRORS ON QAM SYSTEMS WITH ERROR-CONTROL CODING AND SOFT DECISION DECODING

Demodulation of M-ary quadrature amplitude modulation (M-QAM) requires the receiver to estimate the phase and amplitude of the received signal. The demodulator performance is sensitive to errors in these estimates, and the sensitivity increases as M increases. We examine the effects of phase and amplitude errors on the performance of QAM communication systems with error-control coding and soft-decision decoding. A mathematical analysis of these effects is presented for two soft-decision decoding metrics. Performance comparisons are given for 16-QAM and 64-QAM for two error-control coding techniques and two soft-decision decoding metrics

A Short History of K-12 Public School Spending in British Columbia, 1970-2020

This article looks at fifty years’ worth (1970-2020) of public K-12 education expenditure data from the Canadian province of British Columbia. It asks if spending has increased or decreased in this period and examines the causes and correlates of spending changes. Previous research has tended to assume that spending has decreased during this “neoliberal” period. However, historical and empirical research in this article gives a much different picture. K-12 public education spending in British Columbia – adjusted for inflation – is 250 percent higher in 2020 than it was in 1970. Meanwhile, enrolment in 2020 is only 110 percent of 1970 enrolment. The main cause of spending growth is increase in the number of teachers the system employs, which depended in no small part on the British Columbia Teachers’ Federation (BCTF)’s successful attempts to negotiate class size and composition rules. Other causes of spending growth are provincial and district spending priorities. Successive provincial governments have tried to rein in education spending by legislating cost controls on district spending and teacher contracts but have seldom achieved reductions for long. Spending increases and attempts at cost control are at best only linked partially to governing party ideology, with right-wing and left-wing provincial governments both initiating years of increases and cutbacks. More empirical research is needed, especially into spending’s effects on educational equity and quality, to complete the picture of education finance in British Columbia. &nbsp

Pixelation effects in weak lensing

Weak gravitational lensing can be used to investigate both dark matter and dark energy but requires accurate measurements of the shapes of faint, distant galaxies. Such measurements are hindered by the finite resolution and pixel scale of digital cameras. We investigate the optimum choice of pixel scale for a space-based mission, using the engineering model and survey strategy of the proposed Supernova Acceleration Probe as a baseline. We do this by simulating realistic astronomical images containing a known input shear signal and then attempting to recover the signal using the Rhodes, Refregier, & Groth algorithm. We find that the quality of shear measurement is always improved by smaller pixels. However, in practice, telescopes are usually limited to a finite number of pixels and operational life span, so the total area of a survey increases with pixel size. We therefore fix the survey lifetime and the number of pixels in the focal plane while varying the pixel scale, thereby effectively varying the survey size. In a pure trade-off for image resolution versus survey area, we find that measurements of the matter power spectrum would have minimum statistical error with a pixel scale of 0.09 '' for a 0.14 '' FWHM point-spread function (PSF). The pixel scale could be increased to similar to 0.16 '' if images dithered by exactly half-pixel offsets were always available. Some of our results do depend on our adopted shape measurement method and should be regarded as an upper limit: future pipelines may require smaller pixels to overcome systematic floors not yet accessible, and, in certain circumstances, measuring the shape of the PSF might be more difficult than those of galaxies. However, the relative trends in our analysis are robust, especially those of the surface density of resolved galaxies. Our approach thus provides a snapshot of potential in available technology, and a practical counterpart to analytic studies of pixelation, which necessarily assume an idealized shape measurement method

Editorial board, information for authors, and other front matter

This content includes the front cover, the table of contents, editorial and other information for authors for vol. 99, no. 1 (2015) of Journal of Applied Communication

Journal of Applied Communications 100(4) Full Issue

Journal of Applied Communications 100(4) - Full Issu

Editorial board, information for authors, and other front matter

This content includes the front cover, the table of contents, editorial and other information for authors for vol. 98, no. 1 (2014) of Journal of Applied Communication