134 research outputs found
Single- and Multi-carrier Quadrature Amplitude Modulation: Principles and Applications for Personal Communications, WATM and Broadcasting: 2nd
No full textSingle- and Multi-carrier Quadrature Amplitude Modulation Principles and Applications for Personal Communications, WLANs and Broadcasting L. Hanzo Department of Electronics and Computer Science, University of Southampton, UK W. Webb Motorola, Arlington Heights, USA formerly at Multiple Access Communications Ltd, Southampton, UK T. Keller Ubinetics, Cambridge Technology Centre, Melbourn, UK formerly at Department of Electronics and Computer Science, University of Southampton, UK Motivated by the rapid evolution of wireless communication systems, this expanded second edition provides an overview of most major single- and multi-carrier Quadrature Amplitude Modulation (QAM) techniques commencing with simple QAM schemes for the uninitiated through to complex, rapidly-evolving areas, such as arrangements for wide-band mobile channels. Targeted at the more advanced reader, the multi-carrier modulation based second half of the book presents a research-orientated outlook using a variety of novel QAM-based arrangements. * Features six new chapters dealing with the complexities of multi-carrier modulation which has found applications ranging from Wireless Local Area Networks (WLAN) to Digital Video Broadcasting (DVB) * Provides a rudimentary introduction for readers requiring a background in the field of modulation and radio wave propagation * Discusses classic QAM transmission issues relevant to Gaussian channels * Examines QAM-based transmissions over mobile radio channels * Incorporates QAM-related orthogonal techniques, considers the spectral efficiency of QAM in cellular frequency re-use structures and presents a QAM-based speech communications system design study * Introduces Orthogonal Frequency Division Multiplexing (OFDM) over both Gaussian and wideband fading channels By providing an all-encompassing self-contained treatment of single- and multi- carrier QAM based communications, a wide range of readers including senior undergraduate and postgraduate students, practising engineers and researchers alike will all find the coverage of this book attractive
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The James Webb Space Telescope Mission
No full textTwenty-six years ago a small committee report, building on earlier studies, expounded a compelling and poetic vision for the future of astronomy, calling for an infrared-optimized space telescope with an aperture of at least 4 m. With the support of their governments in the US, Europe, and Canada, 20,000 people realized that vision as the 6.5 m James Webb Space Telescope. A generation of astronomers will celebrate their accomplishments for the life of the mission, potentially as long as 20 yr, and beyond. This report and the scientific discoveries that follow are extended thank-you notes to the 20,000 team members. The telescope is working perfectly, with much better image quality than expected. In this and accompanying papers, we give a brief history, describe the observatory, outline its objectives and current observing program, and discuss the inventions and people who made it possible. We cite detailed reports on the design and the measured performance on orbit. © 2023. The Author(s). Published by IOP Publishing Ltd on behalf of the Astronomical Society of the Pacific (ASP). All rights reserved.Open access articleThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]
The Relationship between Education and Health in Australia and Canada
No full textIt is well accepted that education is positively related to health. However, there is considerably less agreement as to the explanation of this relationship. I examine the strength of the empirical relationship between education and health for Australia and Canada. I find that education is indeed related to health and to a very similar extent in both countries. I discuss three important explanations of the education and health relationship: technical efficiency, allocative efficiency and time preference explanations. Empirical analysis is presented which attempts to distinguish between the alternative explanations. I find evidence for all three explanations.Health status; Education; Health production
Immigrant Mental Health and Unemployment
No full textThe objective of this research is to assess whether stress associated with the transition to a new country combined with additional stress arising from unemployment affects the mental health of immigrants. I use the Longitudinal Survey of Immigrants to Australia (LSIA) to examine the effect of labour force status on the mental health of immigrants. By using a rich longitudinal data set, I am able to control for individual immigrant differences whilst examining whether changes in mental health cause changes in labour force status rather than changes in labour force status causing changes in mental health. I find that causality runs from unemployment to mental health and that unemployment significantly adversely affects the mental health of immigrants. Other characteristics associated with poor mental health include; age, gender, visa category, marital status and educational attainment.Immigrants; Mental health; Unemployment
Survey Results of the New Health Care Worker Study: Implications of Changing Employment Patterns
No full textThis report examines the effects of contemporary employment arrangements on the quality of nursing work life, and the implications of these employment arrangements for individual nurses, the hospitals, and also for the organization. First we look at nurse work status (full-time, part-time or casual job), contract status (permanent or temporary), and employment preference as factors affecting commitment to the hospital and profession, job satisfaction, retention in the organization, and absenteeism from work. Second, we examine stress, burnout, and physical occupational health problems (in particular, musculoskeletal disorders), as affecting nurse and hospital outcomes. This project investigated how the quality of nursing worklife and career choices differ for nurses in full-time, part-time and casual employment, and whether nurses who have the employment arrangements they prefer enjoy a standard of worklife that encourages retention. We collected data for the study from 1,396 nurses employed at three large teaching hospitals in Southern Ontario (Hamilton Health Sciences, Kingston General Hospital, and St. Michael's Hospital in Toronto) using the New Health Care Worker Questionnaire. Results indicate that although a substantial majority of the nurses were employed in the type of job that they preferred, problems of stress, burnout and physical health problems were reported. Further, these problems affected the nurses' job satisfaction, commitment, and propensity to leave the hospitals.health care workers, employment status, nurses, job satisfaction, commitment, stress, burnout, physical health problems, MSD, propensity to leave
Goal-directed resuscitation for patients with early septic shock
No full textBACKGROUND: Early goal-directed therapy (EGDT) has been endorsed in the guidelines of the Surviving Sepsis Campaign as a key strategy to decrease mortality among patients presenting to the emergency department with septic shock. However, its effectiveness is uncertain. METHODS: In this trial conducted at 51 centers (mostly in Australia or New Zealand), we randomly assigned patients presenting to the emergency department with early septic shock to receive either EGDT or usual care. The primary outcome was all-cause mortality within 90 days after randomization. RESULTS: Of the 1600 enrolled patients, 796 were assigned to the EGDT group and 804 to the usual-care group. Primary outcome data were available for more than 99% of the patients. Patients in the EGDT group received a larger mean (±SD) volume of intravenous fluids in the first 6 hours after randomization than did those in the usual-care group (1964±1415 ml vs. 1713±1401 ml) and were more likely to receive vasopressor infusions (66.6% vs. 57.8%), red-cell transfusions (13.6% vs. 7.0%), and dobutamine (15.4% vs. 2.6%) (P<0.001 for all comparisons). At 90 days after randomization, 147 deaths had occurred in the EGDT group and 150 had occurred in the usual-care group, for rates of death of 18.6% and 18.8%, respectively (absolute risk difference with EGDT vs. usual care, -0.3 percentage points; 95% confidence interval, -4.1 to 3.6; P=0.90). There was no significant difference in survival time, in-hospital mortality, duration of organ support, or length of hospital stay. CONCLUSIONS: In critically ill patients presenting to the emergency department with early septic shock, EGDT did not reduce all-cause mortality at 90 days. (Funded by the National Health and Medical Research Council of Australia and the Alfred Foundation; ARISE ClinicalTrials.gov number, NCT00975793.)Sandra L. Peake, Anthony Delaney, Michael Bailey, Rinaldo Bellomo, Peter A. Cameron, James Cooper, Alisa M. Higgins, Anna Holdgate, Belinda D. Howe, Steven A.R. Webb, Patricia Williams, The Australasian Resuscitation in Sepsis Evaluation (ARISE) Investigators and the Australian and New Zealand Intensive Care Society ANZICS Clinical Trials Grou
Australasian resuscitation of sepsis evaluation (ARISE): A multi-centre, prospective, inception cohort study
No full textAimDetermine current resuscitation practices and outcomes in patients presenting to the emergency department (ED) with sepsis and hypoperfusion or septic shock in Australia and New Zealand (ANZ).MethodsThree-month prospective, multi-centre, observational study of all adult patients with sepsis and hypoperfusion or septic shock in the ED of 32 ANZ tertiary-referral, metropolitan and rural hospitals.Results324 patients were enrolled (mean [SD] age 63.4 [19.2] years, APACHE II score 19.0 [8.2], 52.5% male). Pneumonia (n=138/324, 42.6%) and urinary tract infection (n=98/324, 30.2%) were the commonest sources of sepsis. Between ED presentation and 6hours post-enrolment (T6hrs), 44.4% (n=144/324) of patients received an intra-arterial catheter, 37% (n=120/324) a central venous catheter and 0% (n=0/324) a continuous central venous oxygen saturation (ScvO(2)) catheter. Between enrolment and T6hrs, 32.1% (n=104/324) received a vasopressor infusion, 7.4% (n=24/324) a red blood cell transfusion, 2.5% (n=8/324) a dobutamine infusion and 18.5% (n=60/324) invasive mechanical ventilation. Twenty patients (6.2%) were transferred from ED directly to the operating theatre, 36.4% (n=118/324) were admitted directly to ICU, 1.2% (n=4/324) died in the ED and 56.2% (n=182/324) were transferred to the hospital floor. Overall ICU admission rate was 52.4% (n=170/324). ICU and overall in-hospital mortality were 18.8% (n=32/170) and 23.1% (n=75/324) respectively. In-hospital mortality was not different between patients admitted to ICU (24.7%, n=42/170) and the hospital floor (21.4%, n=33/154).ConclusionsManagement of ANZ patients presenting to ED with sepsis does not routinely include protocolised, ScvO(2)-directed resuscitation. In-hospital mortality compares favourably with reported mortality in international sepsis trials and nationwide surveys of resuscitation practices.Sandra L. Peake, Michael Bailey, Rinaldo Bellomo, Peter A. Cameron, Anthony Cross, Anthony Delaney, Simon Finfer, Alisa Higgins, Daryl A. Jones, John A. Myburgh, Gillian A. Syres, Steven A.R. Webb, Patricia Williams, the ARISE Investigators, for the Australian and New Zealand Intensive Care Society Clinical Trials Grou
S.L.I.M., a small linear interdependent model of eight EU-member states, the USA and Japan
No full textInternational Economics;EU
Social Transfers and Income Inequality in Old-age: A Multi-national Perspective
No full textThis paper examines variation in old-age income inequality between industrialized nations with modern welfare systems. The analysis of income inequality across countries with different retirement income systems provides a perspective on public pension policy choices and designs and their distributional implications. Because of the progressive nature of public pension programs, we hypothesize that there is an inverse relationship between the quality of public pension benefits and old-age income inequality -- that is, countries with comprehensive, universal, and generous public pension systems will exhibit more equal distributions of income in old age. Luxembourg Income Study data indeed show that cross-national variation in old-age income inequality is partly explained by differences in the percentage of seniors' total income derived from public pension transfers. Sweden, for example, has the highest level of government transfers and the lowest level of old-age income inequality, while Israel and the U.S. have the lowest levels of dependency on government transfers and the highest levels of income inequality. A notable exception is Canada where public transfers represent only a moderate portion of elderly income, yet old-age income inequality is relatively low. This suggests that other factors besides quality of public pension benefits play a role in differences in old-age income inequality across countries.old-age; income inequality; public pension policy; government transfers
Satisfied Workers, Retained Workers: Effects of Work and Work Environment on Homecare Workers' Job Satisfaction, Stress, Physical Health, and Retention
No full textThe goal of this project was to assist health system managers and policy makers develop policies and strategies to recruit and retain human resources in the homecare sector and have a satisfied, healthy workforce. The overall research question was: How do the work characteristics of homecare workers and the work environment in homecare contribute to job satisfaction, stress, physical health, and retention? The research is designed as a mixed-method approach with both qualitative and quantitative data. Results showed that restructuring and organizational change in the homecare sector has contributed to both mental and physical health problems (including job stress and musculoskeletal disorders), job dissatisfaction, and retention problems. Factors that contribute to higher levels of satisfaction and the propensity to stay with the organization include organizational and peer support, working one-on-one with clients, doing emotional labour (that is, the work involved in dealing with other people’s feelings), and satisfaction with schedules, pay, and benefits. This study also examined the association between job flexibility and job insecurity and self-reported musculoskeletal disorders and found no relationship between these variables and musculoskeletal disorders.home care workers, retention, job satisfaction
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