Maximising Average Energy Efficiency for Two-User AWGN Broadcast Channel

Energy consumption has become an increasingly important aspect of wireless communications, from both an economical and environmental point of view. New enhancements are being placed on mobile networks to reduce the power consumption of both mobile terminals and base stations. This paper studies the achievable rate region of AWGN broadcast channels under Time-division, Frequency-division and Superposition coding, and locates the optimal energyefficient rate-pair according to a comparison metric based on the average energy efficiency of the system. In addition to the transmit power, circuit power and signalling power are also incorporated in the energy efficiency function, with simulation results verifying that the Superposition coding scheme achieves the highest energy efficiency in an ideal, but non-realistic scenario, where the signalling power is zero. With moderate signalling power, the Frequency-division scheme is the most energy-efficient, with Superposition coding and Time-division becoming second and third best. Conversely, when the signalling power is high, both Timedivision and Frequency-division schemes outperform Superposition coding. On the other hand, the Superposition coding scheme also incorporates rate-fairness into the system, which allows both users to transmit whilst maximising the energy efficiency

Energy efficiency contours for single-carrier downlink channels

Energy efficiency has become an important aspect of wireless communication, both economically and environmentally. This letter investigates the energy efficiency of downlink AWGN channels by employing multiple decoding policies. The overall energy efficiency of the system is based on the bits-per-joule metric, where energy efficiency contours are used to locate the optimal operating points based on the system requirements. Our novel approach uses a linear power model to define the total power consumed at the base station, encompassing the circuit and processing power, and amplifier efficiency, and ensures that the best energy efficiency value can be achieved whilst satisfying other system targets such as QoS and rate-fairness

Average Energy Efficiency Contours for Single Carrier AWGN MAC

Energy efficiency has become increasingly important in wireless communications, with significant environmental and financial benefits. This paper studies the achievable capacity region of a single carrier uplink channel consisting of two transmitters and a single receiver, and uses average energy efficiency contours to find the optimal rate pair based on four different targets: Maximum energy efficiency, a trade-off between maximum energy efficiency and rate fairness, achieving energy efficiency target with maximum sum-rate and achieving energy efficiency target with fairness. In addition to the transmit power, circuit power is also accounted for, with the maximum transmit power constrained to a fixed value. Simulation results demonstrate the achievability of the optimal energy-efficient rate pair within the capacity region, and provide the trade-off for energy efficiency, fairness and maximum sum-rate

An Improved Model Predictive Control Method to Drive an Induction Motor Fed by Three-Level Diode-Clamped Indirect Matrix Converter

In this paper, an improved model predictive control method is proposed to drive an induction motor fed by a three-level matrix converter. The main objective of this paper is to present a novel method to increase the switching frequency at a constant sampling time. Also, it is analytically discussed that increasing the switching frequency not only can decrease the motor current ripples, but it can also significantly reduce its torque ripples. Finally, this study demonstrates that reducing the motor current ripple will improve the quality of the supply current. To be the accurate model and validate the motor drive system, a co-simulation method, which is a combination of FLUX and MATLAB software packages, is employed to find the simulation results. The findings indicate that the proposed method diminishes the THD of the supply current up to 26% approximately. Furthermore, increasing the switching frequency results in the torque ripple reduction by up to 10% almost

Effect of Matricaria Camomilla Aroma on Severity of first stage Labor Pain

Abstract Background and Aims: Labor pain relief is one of the challenges in health care systems in the most countries and is the main goal in midwifery cares. This study aimed to investigate the Effect of Matricaria Camomilla Aroma on Severity of first stage Labor Pain in primiparous women in Abhar Emdadi hospital, 2013. Methods: This study was a randomized clinical trial carried out on 130 eligible primiparous women (65 in intervention and 65 in control group) at Emdadi hospital of Abhar. In the aroma therapy group gauze were soaked in 2 drop of Matrica Camomilla water and in the control group gauze were soaked in 2 drop of distilled water and attached to the women's collars. Pain severity was measured in first and after intervention in 3-4, 5-7, and 8-10 centimeter dilatations. Data were collected by demographic and obstetrics questionnaire, observation and exam checklist and the numeral scale of pain measurement. Results: The mean pain severity score after the intervention in 3-4 cm (5/75 1/99), 5-7cm (7/84 1/52) and 8-10cm (8/55 1/22) decreased significantly compared with control group in dilatation 3-4 cm (6/93 1/96), 5-7 cm (9/41 0/63) and 8-10 cm (9/8 0/40). (p<0/005). Conclusion:The findings of the study revealed that aroma therapy using Matrica Camomilla water alleviates the labor pain. More research for uses Matrica Camomilla to reduce the labor pain is recommended

The Relationship between Psychological Status (Depression and Anxiety) and Social Support and Sexual Function

AbstractIntroduction: Given that large numbers of marital problems arise from lack of proper satisfaction with sexual desire (libido) as well as lack of awareness towards the complicated dimensions of this fundamental motive, the purpose of the present study was to determine correlations between psychological state (depression and anxiety), social support, and sexual function among females of the reproductive age.Methods: This study was a descriptive-analytic research on 400 females referred to clinics affiliated with Shahid Beheshti University of Medical Sciences in the city of Tehran, during year 2015. The study sample was recruited by cluster and multi-stage random sampling method. The Sexual Function Questionnaire, Demographic Questionnaire, Scale of Perceived Social Support, Spielberger’s Anxiety Inventory, and Beck Depression Inventory were also used to collect the data. The obtained data was analyzed through the SPSS software via descriptive statistics, t test, one way Analysis of Variance (ANOVA), as well as chi-square test.Results: The findings revealed that 4.5% of females had poor level of sexual functioning. In addition, 24.5% of females benefited from low social support and also 75% and 9% of the given individuals had chronic depression and severe anxiety, respectively. According to the results of this study, sexual functioning was correlated with female’s age, husband’s age, age of first pregnancy, length of marriage, duration of having private rooms, and history of infertility (P ˂ 0.05). Furthermore, there were relationships between sexual functioning and depression as well as anxiety and social support (P ˂ 0.05).Conclusions: It was concluded that sexual functioning was correlated with psychological state (depression and anxiety) and social support. Thus, it was recommended to conduct screening tests in terms of the variables examined

Evaluation of the effects of Matricaria chamomilla aroma on intensity of the labor pain in primparous women in Emdadi Hospital of Abhar in 2013

Labor pain relief is one of the challenges in health care systems in the most countries and is the main goal in midwifery cares. Introduction: This study aimed to investigate the chamomile breath on this pain intensity in the first stage of labor on prim parous women in Abhar Emdadi hospital in 2013. Methods and Results: This study was a randomized clinical trial carried out on 130 eligible prim parous women (65 in intervention and 65 in control group) at Emdadi Hospital of Abhar. The pain severity was measured at the moment of enrolling in the study. In the aroma therapy group gauze was soaked in 2 drops of Matrica camomilla water and in the control group gauze were soaked in 2 drops of distilled water and attached to the woman collars. The intervention was repeated every half an hour. Pain severity was measured in first and after intervention in 3-4, 5-7, and 8-10 centimeter dilatations. The samples were followed up until delivery. The materials used in this study were the demographic and obstetrics questionnaire, observation and exam checklist and the numeral scale of pain measurement. Independent T-test, the Mann-Whitney and Chi-squared test was implemented to analyze the data using SPSS v22 while the significance level was (0.05). The two groups were homogenized regarding age, profession, education, wanted pregnancy and number and severity of uterus contraction. The bishop score was calculated as well. Before intervention, the mean pain severity score after the intervention in intervention group in 3-4 cm (5.75±1.99), 5-7cm (7±1.52) and 8-10cm (7.01±1.22) decreased significantly compared with control group in dilatation 3-4 cm (8.93±1.96), 5-7 cm (9.41±0.63) and 8-10 cm (9.8±0.40) (p&lt;0.005). Conclusions: The findings of the study revealed that aromatherapy of M. chamomilla water alleviates the labor pain. Therefore this method is recommended due to reducing the labor pain

The Relationship between Metabolic Syndrome and Shift Work in Midwives: A Cross Sectional Study

AbstractIntroduction: Recent studies suggest that shift work can be associated with the incidence of metabolic syndrome. The present study was conducted in 2019 to investigate the relationship between metabolic syndrome and shift work in midwives working in hospitals affiliated to universities of medical sciences in Tehran, Iran.Methods: The present analytical cross-sectional study recruited 216 midwives who satisfied the inclusion criteria. Questionnaires were first used to collect demographic information and job records. Waist circumference and blood pressure of the subjects were then measured. A 12-hour fasting blood test was performed to determine fasting blood sugar (FBS), triglyceride and HDL levels. The frequency of metabolic syndrome was ultimately evaluated based on the Harmonized criteria. Data were analyzed in SPSS using the Chi-square and Fisher's exact tests.Results: The prevalence of metabolic syndrome was found to be 6.9% in the midwives using the Harmonized criteria. Although the prevalence of metabolic syndrome was higher in the night-shift workers (11.5%) compared to that in the other two groups, but the difference was not significant. Low HDL cholesterol and abdominal obesity were respectively the most frequent metabolic syndrome criteria. Significant relationships were observed between low HDL cholesterol and night shift (P&lt;0.001), and also between abdominal obesity and rotational shift work (P&lt;0.001).Conclusions: According to the present findings, a higher prevalence of metabolic syndrome was observed in the night-shift workers, and rotational shift work was found to be significantly associated with two of the metabolic syndrome criteria, namely low HDL levels and abdominal obesity

The effect of the timing of umbilical cord clamping on hemoglobin levels, neonatal outcomes and developmental status in infants at 4 months old

Objective:Delayed umbilical cord clamping (DCC) increases blood transfer to newborns. Hence we investigated the effect of the timing of DCC on hemoglobin levels, neonatal outcomes and developmental status in infants at four months old.Materials &amp; Methods:This clinical trial examined infants born to 400 pregnant women immediately upon birth and at the age of four months. The newborns were randomly assigned to either the intervention group with a 90-120-second delay in umbilical cord clamping or the control group with a clamping delay of below 60 seconds, and blood samples were taken from their umbilical cords. The Ages and Stages Questionnaire was used to evaluate the infants’ developmental status.Results:Umbilical cord hemoglobin was found to be significantly higher in the intervention group compared to in the controls (P=0/024). No significant differences were observed between the two groups in terms of neonatal complications except neonatal jaundice was significantly more common in the intervention group (P=0/025), although the need for phototherapy was not different between the groups. Overall, no significant differences were observed between the two groups in terms of developmental status at four months old; however, the infants had better problem-solving skills in the delayed umbilical cord clamping group (P=0/015).Conclusion:The results obtained show that, despite elevating hemoglobin, delayed umbilical cord clamping but has no effects on infant development except in terms of problem-solving skills. Further studies are recommended on the effects of delayed umbilical cord clamping on infant development

The prevalence of pediculosis capitis and its associated risk factors in primary schools of girls in rural district

زمینه و هدف: آلودگی به شپش سر یکی از بیماری های شایع در تمام سنین و دارای انتشار جهانی است. آلودگی به شپش سر در مراکز تجمعی مانند مدرسه‌ها، پادگان‌ها و خوابگاه ها زیاد و در مدارس، بویژه مدرسه‌های ابتدایی دخترانه در حد قابل توجهی می باشد. این مطالعه با هدف تعیین شیوع آلودگی به شپش سر و عوامل موثر بر آن در دانش آموزان مدارس ابتدایی دخترانه مناطق روستایی استان قم در سال 1390 انجام شد. روش بررسی: این مطالعه توصیفی- تحلیلی بر روی 900 نفر از دانش آموزان دختر ساکن در مناطق روستایی استان قم که به روش نمونه گیری تصادفی چند مرحله ای انتخاب شدند، انجام شد. داده ها با استفاده از پرسشنامه و معاینه موی سر از نظر آلودگی به شپش جمع آوری شدند و با آزمون های آماری کای اسکور و رگرسیون لجستیک چندگانه مورد تجزیه و تحلیل قرار گرفتند. یافته‌ها: در بین 900 دانش آموز مورد بررسی، 120 نفر (3/13) آلوده به آلودگی با شپش سر تشخیص داده شدند. در آنالیز بین متغیرهای محل سکونت، شغل و تحصیلات پدر، میزان تحصیلات مادر، تعداد افراد خانوار، وجود حمام در منزل، تعداد دفعات استحمام، تعداد دفعات شانه‌زنی، سابقه ابتلا به شپش سر، وجود یا عدم وجود مربی بهداشت در مدرسه، دسترسی یا عدم دسترسی به خدمات بهداشتی درمانی و ابتلا به آلودگی با شپش سر ارتباط معنی دار آماری مشاهده شد (05/0>P). نتیجه گیری: علل شیوع این بیماری در بین دانش آموزان استان قم با عواملی مثل عدم وجود مربی بهداشت در مدرسه، عدم دسترسی کافی به خدمات بهداشتی درمانی، عدم توجه کافی به رعایت بهداشت فردی مرتبط بود. بنابراین رعایت بهداشت فردی، آموزش دادن در مورد راه های آلودگی و پیشگیری از بیماری و فراهم کردن امکانات بهداشتی می تواند در کاهش آلودگی و عوارض ناشی از آن نقش مهمی داشته باشد