Relative Error of Scaled Poisson Approximation via Stein's Method

We study the accuracy of a scaled Poisson approximation to the weighted sum of independent Poisson random variables, focusing on in particular the relative error of the tail distribution. We establish a moderate deviation bound on the approximation error using a modified Stein-Chen method. Numerical experiments are also presented to demonstrate the quality of the approximation

Fast DGT Based Receivers for GFDM in Broadband Channels

Generalized frequency division multiplexing (GFDM) is a recent multicarrier 5G waveform candidate with flexibility of pulse shaping filters. However, the flexibility of choosing a pulse shaping filter may result in inter carrier interference (ICI) and inter symbol interference (ISI), which becomes more severe in a broadband channel. In order to eliminate the ISI and ICI, based on discrete Gabor transform (DGT), in this paper, a transmit GFDM signal is first treated as an inverse DGT (IDGT), and then a frequency-domain DGT is formulated to recover (as a receiver) the GFDM signal. Furthermore, to reduce the complexity, a suboptimal frequency-domain DGT called local DGT (LDGT) is developed. Some analyses are also given for the proposed DGT based receivers.Comment: 28 pages, 8 figure

A140: Comparing Perceived Exercise Benefits Between Exercising and Non-Exercising College Students

Purpose: Regular exercise leads to physiological and psychological benefits. University is a key venue to promote physical activity behavior in young adults. However, it is reported nearly 50% Chinese college students are not reaping the benefits due to insufficient amount of exercise. Therefore, it is necessary to investigate what challenges prevent college students from exercising. Thus, this study was to assess perceived exercise benefits and barriers in Chinese college students and compare the differences between students do exercise and who do not. Methods: The Exercise Benefits/Barriers Scale (EBBS) was used to examine perceived benefits and barriers in 118 non-exercising and 118 exercising students (84 males,152 females; aged 19±1.89) from central China. A non-exerciser does accumulate 150~300 minutes of moderate exercise or 75~150 minutes vigorous exercise over a week. The EBBS includes five subscales assessing benefits (i.e., life enhancement, physical performance, psychological outlook, social interaction, and preventative health) and four subscales assessing barriers (i.e., exercise milieu, time expenditure, physical exertion, and family discouragement). All items are on a 4-point Likert scale, ranging from 1 (strongly disagree) to 4 (strongly agree). Independent t tests were used to compare total and subscale scores between two groups. Results: We found that the total scores for benefits in exercisers were significantly higher than non-exercisers (3.06±0.38 vs. 2.85±0.41, p \u3c 0.001), as well as psychological outlook subscale scores, preventive health subscale scores, social interaction subscale scores, and life enhancement subscale score (p \u3c 0.05). However, there was no significant difference in physical performance subscale score. When comes to the barriers, there were also significantly difference in all barrier subscales (the total barriers scores were 1.89±0.37 and 2.14±0.40, p \u3c 0.001), except for the family discouragement subscale. Conclusions: The results showed that non-exercising college students felt less benefits and strong barriers compared to exercising students. This may be the reason why they did not engage in regular exercise. Although the scores of perceived benefits were higher than the barriers in non-exercisers, it might not be sufficient to motivate them to be physically active

Dexmedetomidine post-treatment attenuates cardiac ischaemia/reperfusion injury by inhibiting apoptosis through HIF-1α signalling.

Hypoxia-inducible factor 1α (HIF-1α) plays a critical role in the apoptotic process during cardiac ischaemia/reperfusion (I/R) injury. This study aimed to investigate whether post-treatment with dexmedetomidine (DEX) could protect against I/R-induced cardiac apoptosis in vivo and in vitro via regulating HIF-1α signalling pathway. Rat myocardial I/R was induced by occluding the left anterior descending artery for 30 minutes followed by 6-hours reperfusion, and cardiomyocyte hypoxia/reoxygenation (H/R) was induced by oxygen-glucose deprivation for 6 hours followed by 3-hours reoxygenation. Dexmedetomidine administration at the beginning of reperfusion or reoxygenation attenuated I/R-induced myocardial injury or H/R-induced cell death, alleviated mitochondrial dysfunction, reduced the number of apoptotic cardiomyocytes, inhibited the activation of HIF-1α and modulated the expressions of apoptosis-related proteins including BCL-2, BAX, BNIP3, cleaved caspase-3 and cleaved PARP. Conversely, the HIF-1α prolyl hydroxylase-2 inhibitor IOX2 partly blocked DEX-mediated cardioprotection both in vivo and in vitro. Mechanistically, DEX down-regulated HIF-1α expression at the post-transcriptional level and inhibited the transcriptional activation of the target gene BNIP3. Post-treatment with DEX protects against cardiac I/R injury in vivo and H/R injury in vitro. These effects are, at least in part, mediated via the inhibition of cell apoptosis by targeting HIF-1α signalling