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With the ever-increasing volume of transactions on e-commerce platforms, the protection of consumer privacy becomes a paramount concern. In this context, group signatures have proven to be an effective tool for the privacy-preserving of consumers. However, conventional group signature schemes are unable to effectively and flexibly control the number of user signatures. Moreover, with the advent of the post-quantum era, the existing cryptographic systems for electronic consumer systems, which rely on traditional number theory, will be undermined by quantum computation. This paper presents an event-oriented linkable group signature scheme from lattice that introduces a higher degree of flexibility in terms of signature control. Then, we prove its security in the random oracle model and based on the hardness of module short integer solution and module learning with errors. The security analysis shows that the scheme respectively achieves quantum security levels of 93-bit and 207-bit for two selected parameter sets. We have also evaluated the storage and time cost of the scheme, which indicates that our scheme is quite practical and could have a promising future in the consumer electronics sector.

Passive Optical Network (PON) plays an important role in optical access network due to its characteristics of resources saving and network protocol transparency. In the process of running and operating a PON system, a reliable network management system (NMS) is necessary. In order to acquisition the management object, NMS should perform topology automatic discovery process with the help of embedded software. Aiming at various types of the convergence network’s topology and the complicated architecture, this article proposes a topology automatic discovery algorithm to promote the network management. We have designed and verified the automatic discovery method on our simulation platform with SNMP-Agent-enabled OLTs.

An important problem of network traffic is how to efficiently carry massive amounts of data traffic generated by Peer-to-Peer (P2P) services in high-speed and large-capacity optical access networks. P2P file-sharing traffic is regarded as one of the biggest bandwidth consumption in the world. Internet service providers can reduce the bandwidth burden in the feeder fiber by localizing the network traffic. In this paper, we propose an enhanced redirection strategy based on the optimized MPCP protocol (ERS-MPCP) to redirect the traffic into the access network and reduce the latency. A Markov chain is used for mathematical modeling. In the proposed strategy, we build a simulation platform for network simulation. Simulation results show that our strategy can improve the overall redirection success rate by up to 9%, thereby reducing the data traffic burden on the core network.

Objective:To investigate the prevalence, characteristics, and preventive status of skin injuries caused by personal protective equipment (PPE) in medical staff.Approach:A cross-sectional survey was conducted online for understanding skin injuries among medical staff fighting COVID-19 in February 8–22, 2020. Participants voluntarily answered and submitted the questionnaire with cell phone. The questionnaire items included demographic data, grade of PPE and daily wearing time, skin injury types, anatomical sites, and preventive measures. Univariable analyses and logistic regression analyses were used to explore the risk factors associated with skin injuries.Results:A total of 4,308 respondents were collected from 161 hospitals and 4,306 respondents were valid. The overall prevalence of skin injuries was 42.8% (95% confidence interval [CI] 41.30–44.30) with three types of device-related pressure injuries, moist-associated skin damage, and skin tear. Co-skin injuries and multiple location injuries were 27.4% and 76.8%, respectively. The logistic regression analysis indicated that sweating (95% CI for odds ratio [OR] 87.52–163.11), daily wearing time (95% CI for OR 1.61–3.21), male (95% CI for OR 1.11–2.13), and grade 3 PPE (95% CI for OR 1.08–2.01) were associated with skin injuries. Only 17.7% of respondents took prevention and 45.0% of skin injuries were treated.Innovation:This is the first cross-sectional survey to understand skin injuries in medical staff caused by PPE, which is expected to be a benchmark.Conclusion:The skin injuries among medical staff are serious, with insufficient prevention and treatment. A comprehensive program should be taken in the future.

Objective: To identify the prevalence of obesity, sarcopenia, sarcopenic obesity in end-stage knee osteoarthritis (KOA) patients and analyze influences of obesity and sarcopenia in the progression of KOA. Methods: A cross-sectional study was carried out among end-stage KOA patients who consecutively admitted to Orthopedic Department for TKA. We suppose that the level of decreased physical activities would be influenced by unilateral or bilateral KOA. Patient information, albumin, hemoglobin, pace, step frequency, number of comorbid conditions were collected. Bioelectrical impedance analyzer was used to analyze body composition. Obesity, sarcopenia, sarcopenic obesity rate were analyzed with accepted diagnosis criteria. Correlations between body mass index (BMI) or age and fat mass (FM), appendicular skeletal muscle mass (ASM) were analyzed. Results: 138 patients (male 30, female 108) in southwest of China including 67 patients with unilateral KOA and 71 patients with bilateral KOA were analyzed. No statistic difference was found in mean albumin, prealbumin and hematocrystallin, body composition values and number of comorbid conditions. We found that BMI was positively correlated with FM (Male: R2= 0.7177, p< 0.0001, Female: R2= 0.8898, p< 0.0001), ASM (Male: R2= 0.2640, p= 0.0037, Female: R2= 0.2102, p< 0.0001), FM index (FMI) (Male: R2= 0.6778, p< 0.0001, Female: R2= 0.8801, p< 0.0001), and ASM index (ASMI) (Male: R2= 0.3600, p= 0.0005, Female: R2= 0.4208, p< 0.0001) in end-stage KOA patients. However, age was not obviously correlated with FM or FMI (Male: FM, R2= 0.006911, p= 0.3924; FMI, R2= 0.7554, p= 0.0009196; Female: FM, R2= 0.001548, p= 0.8412; FMI, R2= 0.002776, p= 0.7822). And slightly negatively correlated with ASM (Male: R2= 0.05613, p= 0.0136, Female: R2= 0.01327, p= 0.5433) and ASMI (Male: R2= 0.02982, p= 0.3615; Female: R2= 0.03696, p= 0.0462). The prevalence of obesity, sarcopenia and obesity sarcopenia differs according to different diagnosis criteria. No difference in the occurrence rate of obesity was found between bilateral KOA and unilateral KOA patients, and occurrence rates of sarcopenia and sarcopenic obesity were statistically higher in bilateral KOA than that in unilateral KOA patients. Conclusions: Obesity, sarcopenia and sarcopenic obesity are highly prevalent in end-stage KOA patients, sarcopenic obesity are more prevalent in bilateral KOA patients than that in unilateral KOA patients.