Performance Analysis of a Low-Interference N-Continuous OFDM Scheme

This paper investigates two issues of power spectrum density (PSD) and bit error rate (BER) of an N-continuous orthogonal frequency division multiplexing (NC-OFDM) aided low-interference time-domain scheme, when the smooth signal is designed by the linear combination of basis signals truncated by a window. Based on the relationship between the continuity and sidelobe decaying, the PSD performance is first analyzed and compared, in terms of the highest derivative order (HDO) N and the length of the smooth signal L. Since the high-order derivative of the truncation window has the finite continuity, the N-continuous signal has two finite continuities, which may have different continuous derivative orders. In this case, we develop a close PSD expression by introducing another smooth signal, which is also linearly combined by other basis signals, to explain the sidelobe decaying related to N and L. Then, in the context of BER, considering the multipath Rayleigh fading channel, based on the effect of the delayed tail of the smooth signal to the received signal, we provide a procedure for calculating the BER expressed in the form of an asymptotic summation.Comment: 7 pages, 6 figure

Impacts of Covid-19 mode shift on road traffic

This article is driven by the following question: as the communities reopen after the COVID-19 pandemic, will changing transportation mode share lead to worse traffic than before? This question could be critical especially if many people rush to single occupancy vehicles. To this end, we estimate how congestion will increases as the number of cars increase on the road, and identify the most sensitive cites to drop in transit usage. Travel time and mode share data from the American Community Survey of the US Census Bureau, for metro areas across the US. A BPR model is used to relate average travel times to the estimated number of commuters traveling by car. We then evaluate increased vehicle volumes on the road if different portions of transit and car pool users switch to single-occupancy vehicles, and report the resulting travel time from the BPR model. The scenarios predict that cities with large transit ridership are at risk for extreme traffic unless transit systems can resume safe, high throughput operations quickly.Comment: 14 pages, 11 figure

IR-improved Soft-wall AdS/QCD Model for Baryons

We construct an infrared-improved soft-wall AdS/QCD model for baryons by considering the infrared-modified 5D conformal mass and Yukawa coupling of the bulk baryon field. The model is also built by taking into account the parity-doublet pattern for the excited baryons. When taking the bulk vacuum structure of the meson field to be the one obtained consistently in the infrared-improved soft-wall AdS/QCD model for mesons, we arrive at a consistent prediction for the baryon mass spectrum in even and odd parity. The prediction shows a remarkable agreement with the experimental data. We also perform a calculation for the $\rho(a_1)$ meson-nucleon coupling constant and obtain a consistent result in comparison with the experimental data and many other models.Comment: 12 pages, 4 tables, 1 figure, to be published in PL

Modelling the Consumption Behaviour of Heterogeneous Consumers: A Duty-Free Shop Case Simulation Analysis

Duty-free shops, which have emerged in major airports, first-tier cities, free trade zones and other places, have become ideal places for not only facilitating people to buy goods but also promoting the development of the local economy, which makes the study of the heterogeneous consumer purchase behavior in duty-free stores of great importance and great practical significance. Based on this, the agent model is used to study the purchase behavior of heterogeneous consumers in duty-free stores, the structure of the agent model is proposed, the consumer submodel and situation submodel are designed, and a service recommendation is made. On this basis, the consumer behavior is simulated and analyzed both with and without considering situational factors. The following conclusions are drawn: (1) The display, the month, holidays, and other factors have an important impact on the heterogeneous consumers of duty-free stores and affect consumers\u27 consumption behavior. (2) Salespeople\u27s recommendation rules and consumers\u27 purchase preferences affect consumers\u27 purchase behavior, which has an important impact on the types and quantity of goods consumers buy

From Seekers to Providers: Investigating the Transition of Participation Style in Online Health Communities

Online health communities (OHCs) enable community members to share informational and emotional support, enhancing their psychological and functional well-being. However, attrition of community membership has long hindered OHCs\u27 continuous development. Previous research suggests that social support providers, a particular participation style, tend to maintain longer community membership and demonstrate increased engagement in the community. This study aims to identify the factors that motivate members to transition from social support seekers to providers. Drawing on reciprocity and social norms, we hypothesize that community members who have received informational/emotional support or have been exposed to a higher proportion of such support are more likely to become informational/emotional providers. To validate these hypotheses, we will analyze data collected from a real OHC. Our findings will contribute to the contextualization of social support theory in OHC settings and offer practical guidance for enhancing community sustainability to OHC administrators