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1.
IEEE Electron Device Letters ; : 1-1, 2022.
Article in English | Scopus | ID: covidwho-2078240

ABSTRACT

A stamp-based printing technique was applied to transfer the β-Ga<sub>2</sub>O<sub>3</sub> films grown by pulsed laser deposition (PLD) from Si substrates onto some flexible substrates, such as PET, PEN, and PI. It is demonstrated that the β-Ga<sub>2</sub>O<sub>3</sub>-based flexible solar-blind photodetectors (SBPDs) exhibit brilliant optoelectrical performances with a low dark current of 1.7 pA at 10 V, a I<sub>254nm</sub>/I<sub>dark</sub> ratio of 1.2×103, rise (τ<sub>r1</sub> = 0.079 s and τ<sub>r2</sub> = 0.413 s) and decay (τ<sub>d1</sub> = 0.029 s and τ<sub>d2</sub> = 0.316 s) times. In a further step, flexible imaging sensor arrays based on the β-Ga<sub>2</sub>O<sub>3</sub>/PET were fabricated, which exhibit good imaging capability and resolution. Moreover, wearable UVC-alarms based on the β-Ga<sub>2</sub>O<sub>3</sub>/PET were realized to monitor the UVC radiation in the environment in real time, which can be used in the COVID-19-related area. IEEE

2.
Emergency and Critical Care Medicine ; 2(3):109-115, 2022.
Article in English | Scopus | ID: covidwho-2077920

ABSTRACT

Background The coronavirus disease 2019 (COVID-19) has affected approximately 2 million individuals worldwide;however, data regarding fatal cases have been limited. Objective To report the clinical features of 162 fatal cases of COVID-19 from 5 hospitals in Wuhan between December 30, 2019 and March 12, 2020. Methods The demographic data, signs and symptoms, clinical course, comorbidities, laboratory findings, computed tomographic (CT) scans, treatments, and complications of the patients with fatal cases were retrieved from electronic medical records. Results The median patient age was 69.5 (interquartile range: 63.0-77.25) years, and 80% of the patients were over 61 years. A total of 112 (69.1%) patients were men. Hypertension (45.1%) was the most common comorbidity, while 59 (36.4%) patients had no comorbidity. At admission, 131 (81.9%) patients had severe or critical COVID-19, whereas 39 (18.1%) patients with hypertension or chronic lung disease had moderate COVID-19. In total, 126 (77.8%) patients received antiviral treatment, while 132(81.5%) patients received glucocorticoid treatment. A total of 116 (71.6%) patients were admitted to the intensive care unit (ICU), and 137 (85.1%) patients received mechanical ventilation. Most patients received mechanical ventilation before ICU admission. Approximately 93.2% of the patients developed respiratory failure or acute respiratory distress syndrome. There were no significant differences in the inhospital survival time among the hospitals (P=0.14). Conclusion Young patients with moderate COVID-19 without comorbidity at admission could also develop fatal outcomes. The in-hospital survival time of the fatal cases was similar among the hospitals of different levels in Wuhan. © Wolters Kluwer Health, Inc. All rights reserved.

3.
Medical Surveillance Monthly Report ; 29(3):8-15, 2022.
Article in English | Scopus | ID: covidwho-1980761

ABSTRACT

This study examined monthly prevalence of obesity and exercise in active component U.S. military members prior to and during the COVID-19 pan-demic. Information about obesity (BMI≥30) and self-reported vigorous exercise (≥150 minutes per week) were collected from Periodic Health Assessment (PHA) data. From 1 January 2018 through 31 July 2021, there was a gradual increase in obesity and an overall decrease in vigorous exercise. Comparing the mean monthly percentage of obesity during the 12-month period prior to the pandemic to the 12 months after its start showed an overall increase in obesity (0.43%);however, no obvious spike in the obesity trend was appar-ent following the onset of the pandemic. The prevalence of vigorous exercise showed an abrupt decrease following the onset of the COVID-19 pandemic, but this change did not coincide with an abrupt change in the obesity trend. These results suggest that the COVID-19 pandemic had a small effect on the trend of obesity in the active component U.S. military and that obesity prevalence continues to increase. © 2022, Armed Forces Health Surveillance Center. All rights reserved.

4.
Lecture Notes on Data Engineering and Communications Technologies ; 145:715-728, 2022.
Article in English | Scopus | ID: covidwho-1971543

ABSTRACT

The COVID-19 broke out and spread rapidly, posing a great challenge to the emergency management capacity of various regions in China, especially in rural areas. This paper takes three communities in ShiYang town, Dujiangyan City, Sichuan Province as cases, to analyze the specific practice of rural response to public health emergencies, summarize different stages in epidemic prevention and control, and explore the difficulties and solutions in rural emergency management. Through the case analysis, it is found that the rural epidemic prevention and control in ShiYang Town have experienced four stages including exploration period, development period, improvement period, and maturity period. At the same time, there are some dilemmas in rural emergency management, such as the imperfect emergency management mechanism, insufficient resources guarantee, and villagers’ weak awareness of health and epidemic prevention. Therefore, the paper proposes such countermeasures suggestions as improving the emergency management mechanism of rural public health, optimizing the resources guarantee system for rural emergency management, strengthening the popularization of health education, providing theoretical and practical guidance for improving the level of rural emergency management, and then promoting the modernization of rural emergency management system and capacity. © 2022, The Author(s), under exclusive license to Springer Nature Switzerland AG.

5.
China Oncology ; 32(6):499-511, 2022.
Article in Chinese | Scopus | ID: covidwho-1964893

ABSTRACT

[] The corona virus disease 2019 (COVID-19) pandemic continues to severely impact healthcare systems around the world, and patients with cancer are even worse affected owing to compromised immune status and greater exposure risk. In the present review, we retrieved the relevant literature including guidelines and consensuses directly related to the purpose of this study from the PubMed database, and then summarized the research data on cancer and COVID-19, aiming to discuss the personal protection, systemic anti-cancer therapy, outcome of co-infection, and the clinical management strategy in this population. We found that patients with malignant tumors had a higher chance of suffering COVID-19, co-infection of whom had an even worse clinical prognosis, especially for those with lung cancer or hematologic cancers. Systemic chemotherapy may delay the clearance of severe acute respiratory syndrome corona virus 2 (SARS-CoV-2) virus of human body, and thus have a negative impact on the clinical outcomes of COVID-19, while certain endocrine therapy and targeted drugs having limited or no impact. There has been no sufficient evidence for the impact of immune checkpoint therapy on the outcomes of COVID-19 till now. It is of great value to strengthen the personal protection of patients, adjust the anti-tumor treatments rationally and optimize the clinical management processes. © 2022, Editorial Office of China Oncology. All rights reserved.

6.
4th International Conference on Blockchain Technology, ICBCT 2022 ; : 110-116, 2022.
Article in English | Scopus | ID: covidwho-1962425

ABSTRACT

Location data containing trajectory information is of great value, but its unrestricted sharing also brings problems such as data abuse, privacy threat and lack of audit evidence. Especially when it comes to researchers or governments to collect location data to stem the spread of COVID-19, the authorization of the data owner is often missing. In this paper, we propose a data sharing scheme for location data based on a high-performance consortium blockchain combined with proxy re-encryption, which can guarantee location data sharing under user authorization while ensure the efficiency and security in the process of data sharing. The performance analysis and simulation results illustrate that the proposed scheme can meet the performance requirements in practical scenarios, guarantee the privacy of personal location data while making the data useful for stemming the spread of COVID-19. © 2022 ACM.

7.
Quality Assurance in Education ; 2022.
Article in English | Scopus | ID: covidwho-1861085

ABSTRACT

Purpose: This paper aims to use a quantitative approach to explore the role of online learning behavior in students’ academic performance during the COVID-19 pandemic. Specifically, the authors probe its mediating effect in the relationship between student motivation (extrinsic and intrinsic) and academic performance in a blended learning context. Design/methodology/approach: Survey data were collected from 148 students taking an organizational behavior course at one Chinese university. The data were paired and analyzed through regression analysis. Findings: The results show that students should actively engage in online learning behavior to maximize the effects of blended learning. Extrinsic motivation was found to positively influence academic performance both directly and indirectly through online learning behavior, while intrinsic motivation affected academic performance only indirectly. Originality/value: Through paired data on extrinsic and intrinsic motivation, online learning behavior and academic performance, this study provides a more nuanced understanding of how online learning behavior affects the focal relationship, and it advances research on the mechanisms underlying the focal relationship. Practitioners should enhance students’ online learning behavior to boost blended learning effects during the COVID-19 pandemic. © 2022, Emerald Publishing Limited.

8.
13th International Conference on E-Education, E-Business, E-Management, and E-Learning, IC4E 2022 ; : 515-520, 2022.
Article in English | Scopus | ID: covidwho-1840638

ABSTRACT

The stock market is in turmoil amid during the COVID-19 pandemic. Based on the data from financial report in the past few years, we investigate the performance of GlaxoSmithKline based on DDM-FCF-DS model in terms of financial reports, aiming at finding the best companies to invest. Moreover, the CAPM model is utilized to obtain the beta of the stock based on regression method. According to our results, the company is worth to invest under the COVID-19 period with well performance, which tallies well with the current stock prices. These results contribute to the stock investment value, which will help investor to adopt an optimal investment strategy. © 2022 ACM.

9.
14th International Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2022 ; : 197-201, 2022.
Article in English | Scopus | ID: covidwho-1788711

ABSTRACT

Aiming at the problem of long queuing temperature and low efficiency during the period of COVID-19, an intelligent temperature measurement and access control system is designed. It is widely used in enterprises, institutions, scenic spots, commercial areas and other places with large traffic volume. The main control system adopts stm32f407zgt6 embedded chip, hc-sr501 human body infrared sensor is sensitive to human body proximity, and starts the temperature measurement system. Using hc-sr04 ultrasonic sensor to measure people's height and adjust the height of mlx9064esf temperature probe, the system has the characteristics of efficient real-time temperature monitoring, and improves the detection efficiency in places with large flow of people. The experimental results show that the system has good practical application effect. © 2022 IEEE

10.
2021 IEEE International Conference on Emergency Science and Information Technology, ICESIT 2021 ; : 62-66, 2021.
Article in English | Scopus | ID: covidwho-1759078

ABSTRACT

In this work, a stochastic differential equation model about the novel Coronavirus 2019 (COVID-19) is introduced to describe the transmission dynamics of that disease among the susceptible person. By taking the social distance, musk wearing, and other human behavior as a control strategy and introducing an objective function which both considers the limitation of social distance and minimizes the infection population, an optimal control strategy is given numerically. This result gives a new numerical method to simulate the epidemic model and make a new insight into the control strategy choice of the pandemic control under the environments and conditions of different countries. © 2021 IEEE.

11.
Frontiers in Marine Science ; 9, 2022.
Article in English | Scopus | ID: covidwho-1705635

ABSTRACT

Cruise tourism is becoming increasingly popular worldwide. However, the health and safety of thousands of cruise tourists have been put in jeopardy due to the COVID-19 pandemic. The refusal of cruise ships calling has been the most significant reason behind the health hazards faced by passengers. Moreover, some coastal States have decided to close their borders, leaving passengers to their own fate in the case of a COVID-19 outbreak on board. Situation analysis contributes to demonstrating obstacles encountered in public health governance on cruise tourism. Information is collected from official websites of governments and international organizations to investigate the reasons behind the non-compliance of these countries with the International Health Regulations (IHR) (2005). Academic literatures showcase different views on the necessity of revising the IHR (2005). Statistical analysis is used to assess core capacities required by the IHR (2005) of the coastal States. Coastal States reserve their rights to refuse foreign cruise ships to enter ports and to prevent the persons aboard from embarking or disembarking so long as conditions under Article 43 are met. However, some foreign cruise ships were directly refused to call by various coastal States without scientific evidence. This practice stems largely from the high risk of COVID-19 outbreaks in cruise ships and the resulting burden from the cruise pandemic response. Compared with improving IHR (2005), especially its dispute settlement mechanism, helping coastal States to boost their core capacities is more conducive to solving the problem of cruise public health governance. The improvement of core capacities can be carried out from the aspects of surveillance of cruise ships and risk assessment, medical examinations on cruise travelers, cruise design and cruise tourism management. Copyright © 2022 Hu and Li.

12.
1st CAAI International Conference on Artificial Intelligence, CICAI 2021 ; 13069 LNAI:89-100, 2021.
Article in English | Scopus | ID: covidwho-1626470

ABSTRACT

The global spread of coronavirus disease has become a major threat to global public health. There are more than 137 million confirmed cases worldwide at the time of writing. The spread of COVID-19 has resulted in a huge medical load due to the numerous suspected examinations and community screening. Deep learning methods to automatically classify COVID-19 have become an effective assistive technology. However, the current researches on data quality and the use of CT data to diagnose COVID-19 with convolutional neural networks are poor. This study is based on CT scan data of COVID-19 patients, patients with other lung diseases, and healthy people. In this work, we find that data smoothing can improve the quality of CT images of COVID-19 and improve the accuracy of the model. Specifically, an interpolation smoothing method is proposed using the bilinear interpolation algorithm. Besides, we propose an improved ResNet structure to improve the model feature extraction and fusion by optimizing the structure of the input stem and downsampling parts. Compared with the baseline ResNet, the model improves the accuracy of the three-class classification by 3.8% to 93.83%. Our research has particular significance for research on the automatic diagnosis of COVID-19 infectious diseases. © 2021, Springer Nature Switzerland AG.

13.
Materials Today Physics ; 22:12, 2022.
Article in English | Web of Science | ID: covidwho-1586955

ABSTRACT

Baicalin, a flavonoid compound extracted from the rhizome of Scutellar iae Baicalensis, plays a vital role in improving liver function after injury, reducing liver disease and treating primary liver cancer, which is also the first SARS-CoV-2 3CLpro virus inhibitor according to the latest research data published in Bio-Rxiv. Therefore, constructing a simple and highly sensitive analytical method for the determination of baicalin is of great significance for the clinical and pharmacy settings. Herein, for the first time, carbon dots are explored for baicalin detection. Using biomass waste grape peels as the organic carbon source, nitrogen-doped fluorescent carbon dots (PT-NCDs) were fabricated, which were synthesized perfectly by a simple, environmentally friendly and one-step solid-phase thermal method without adding any other organic or acid/base reagents. Based on the synergistic effect of photo-induced electron transfer and dynamic quenching, a quenched fluorescence sensor for the determination of baicalin with a good linear range of 0.1-20 mu M and a satisfactory detection limit of 43.8 nM was constructed, which successfully quantified trace amount of baicalin in baicalin capsules, human serum and urine samples. The results indicate that PT-CDs are expected to become potential sensing materials for the real-time monitoring of baicalin in organisms, which is very important for our health. (C) 2021 Elsevier Ltd. All rights reserved.

14.
Frontiers in Environmental Science ; 9:16, 2021.
Article in English | Web of Science | ID: covidwho-1581356

ABSTRACT

Asian dust can be transported at least one full circuit around the globe. During the transportation, dust can interact with local air-borne dust and pollutants, and has a profound impact on the environment. A novel coronavirus (COVID-19) has been affecting human activities worldwide since early 2020. The Chinese government has implemented emergency control measures. Since April 2020, control measures to reduce anthropogenic emissions have been gradually reduced. The optical properties of aerosols during the dust transport were affected by meteorological conditions, local environmental conditions and human activities. Therefore, two dust weather processes in March 2018 and March 2020 were screened under similar meteorological fields and transportation paths, which were mainly affected by human activities. Based on lidar data, in East China, compared with 2018, the average aerosol optical depth (AOD) of all types of aerosols at 0-4 km in 2020 decreased by 55.48%, while the AOD of dust aerosols decreased by 43.59%. The average particle depolarization ratio and color ratio decreased by 40.33 and 10.56% respectively. Due to the reduction of anthropogenic emissions in China (detected by lidar), the concentration of surface PM2.5 decreased by 57.47%. This indicated that due to the decrease in human activities caused by COVID-19 control measures, the optical properties of aerosols were significantly reduced during dust weather process in eastern China. However, in the Pacific region, compared with 2018, the AOD values of 0-1 km layer and 1-6 km layer in 2020 increased by 56.4% and decreased by 29.2% respectively. The difference between the two contributions of dust aerosols was very small. Meanwhile, compared with 2018, China's near surface pollutants decreased significantly in 2020, indicating that the near surface AOD of the Pacific in 2020 was mainly contributed by local pollutants. This study was of great significance to the study of long-range and cross regional transport of pollutants.

15.
Transport Policy ; 116:24-47, 2022.
Article in English | Scopus | ID: covidwho-1560832

ABSTRACT

Since the inception of China's Belt and Road Initiative (BRI) in 2013, the associated infrastructure and transport and economic corridor developments have been widely addressed in the research field of transportation, logistics and supply chain management. Such developments open windows of opportunity for accommodating trade flows in new or upgraded intermediate hub nodes and gateway locations along the BRI corridors. This paper aims to propose strategic locations for global logistics distribution centers (LDCs) along the Belt and Road from the viewpoint of China, considering regional economic and trade blocks, maritime transport routes, China's overseas port developments, China Railway Express services, trade conflicts between China and US, and deteriorated mobility of resources and human power caused by COVID-19. We present a set of strategic locations for establishing LDCs by analyzing qualitative and quantitative facility location factors supported by the findings in existing literature. Eight locations for global LDCs are identified in the Sub-Saharan region, Sri Lanka, the Middle East, Northern Oceania, Southern Europe, Northern Europe, and key dry hub port locations in Minsk, Belarus and Northeast Asia along the Silk Road Economic Belt. Furthermore, we present a research agenda with applicable methods. © 2021 Elsevier Ltd

16.
International Journal of Intelligent Systems ; 36(8):4298-4320, 2021.
Article in English | Web of Science | ID: covidwho-1396888

ABSTRACT

A large number of people suffer from anxiety in modern society. As an effective treatment with few side effects, music therapy has been used to reduce anxiety for decades in clinical practice. Yet therapists continue to perform music selection, a key step in music therapy, manually. Considering the growing need for music therapy services and social distancing amid public emergencies, an automatic method for music selection would be of great practical utility. This paper marks the first effort to identify music with therapeutic effects on anxiety reduction via a novel music scoring model. We formulate the calculation of a therapeutic score as a quadratic programming problem, which minimizes score variance among known therapeutic songs while maintaining their superiority over other songs. The proposed model can uncover common features that contribute to anxiety reduction by learning from small and unbalanced data. Using a music therapy experiment, we find that the proposed model outperforms existing techniques in predicting therapeutic songs. Feature analysis is also conducted, revealing that high-frequency spectrums are important in therapeutic scoring.

17.
Chinese Pharmaceutical Journal ; 56(13):1099-1103, 2021.
Article in Chinese | EMBASE | ID: covidwho-1377125

ABSTRACT

OBJECTIVE: To acquire the knowledge of quality control performance through carrying out proficiency Testing Schemes (PTS) nationwide. METHODS: National Institutes for Food and Drug Control(NIFDC) schemed three PTS to evaluate the testing competence of participants from the aspects of safety and stability of vaccine products and pseudotyped virus-based neutralization assay, pseudotyped virus based neutralization assay(PBNA), which takes as a hand of COVID-19 vaccine development. RESULTS: Eighty-nine participants took part in the three PTS and the satisfaction rate stated as 96.9%, 96.4% and 76.0%. CONCLUSION: The testing ability and quality control performance of Official Medical Control Laboratories (OMCL), manufacturers and research institutes are acceptable. The testing results of sterile testing and aluminum assay of aluminum adjuvanted vaccine can be assured well, while the ability of PBNA needs to be improved by some manufacturers.

18.
Acta Optica Sinica ; 41(10):10, 2021.
Article in Chinese | Web of Science | ID: covidwho-1374562

ABSTRACT

For NOx, pollutions in Wuhan during the outbreak of COVID-19, we applied a mobile MAX-DOAS and a portable ultraviolet DOAS to cooperatively measure NOx, concentration in the third ring road of Wuhan from Feb. 29th to Mar. 14th, 2020. The mobile MAX-DOAS acquired the vertical column concentration (VCD) distribution of NO2 along its course and the portable ultraviolet DOAS measured the NO and NO2 concentrations to calculate [NOx]/[NO2]. Then, the NOx emission flux and its error of the third ring road of Wuhan were calculated in conjunction with the data of the wind field. The results show that the NO, emission flux during the measurements in the third ring of Wuhan ranges from 7.78 mol/s to 15.71 mol/s, about 10.78 mol/s on average. Compared with the average [NOx]/[NO2], the real-time [NOx]/[NO2] along the route of the mobile MAX-DOAS derived from the portable ultraviolet DOAS could effectively reduce the error of NOx emission flux caused by the [NOx,]/[NO2] error. However, this method is not recommended in scenarios with substantial near-surface NOx emission sources.

19.
Journal of the Academy of Consultation-Liaison Psychiatry ; 62(2):201-210, 2021.
Article in English | Web of Science | ID: covidwho-1338002

ABSTRACT

Background: Wuhan, the epicenter of the coronavirus disease 2019 outbreak, was locked down on January 23, 2020. We aimed to investigate the barriers to the physical prevention, negative attitudes, and anxiety levels. Methods: A online cross-sectional survey was conducted with the people living in Wuhan between March 12th and 23rd, 2020. Results: Of a total of 2411 complete responses, the mean and standard deviation for the total physical prevention barriers score was 19.73 (standard deviation +/- 5.3;range 12-45) out of a possible score of 48. Using a cut-off score of 44 for the State-Trait Inventory score, 79.9% (95% confidence interval [CI]: 78.2-81.5) of the participants reported moderate to severe anxiety during the early phase of the outbreak, and 51.3% (95% CI 49.2-53.3) reported moderate to severe anxiety after the peak of coronavirus disease 2019 was over (during the study period). Comparing anxiety levels in the early phase of the outbreak and after the peak of the outbreak, 58.5% (95% CI 56.5-60.5) recorded a decreased anxiety. Females reported a higher likelihood of having decreased levels of anxiety than males (odds ratio = 1.78, 95% CI 1.48-2.14). Low negative attitudes score were associated with a higher decrease in anxiety (odds ratio = 1.59, 95% CI 1.33-1.89). Conclusions: The attitudinal barriers to prevention of transmission of coronavirus disease 2019 are more prominent than physical prevention barriers after the peak of corona virus disease 2019. High anxiety levels even after the peak warrant serious attention.

20.
2nd International Workshop on Knowledge Graph Construction, KGCW 2021 ; 2873, 2021.
Article in English | Scopus | ID: covidwho-1273970

ABSTRACT

The housing market is complex and multi-faceted, which makes its analysis challenging for users and professionals. We develop a four-step knowledge graph-based knowledge extraction approach for the housing market for efficient and accurate data analysis, consisting of data acquisition and cleaning, entity linking, ontology mapping, and question answering. The proposed system allows one to summarize the housing information for a selected geographical area, analyze the surroundings by collecting census data, understand the medical safety based on COVID-19 data, and the area attractiveness based on celebrities data from DBpedia. Our system can provide personalized recommendations given keywords and information about the market over time. A user-based evaluation demonstrates the utility of our system. Copyright © 2021 for this paper by its authors. Use permitted under Creative Commons License Attribution 4.0 International (CC BY 4.0).

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