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Thang Phan,Ha Phan Ai Nguyen,Cao Khoa Dang,Minh Tri Phan,Vu Thanh Nguyen,Van Tuan Le,Binh Thang Tran,Chinh Van Dang,Tinh Huu Ho,Minh Tu Nguyen,Thang Van Dinh,Van Trong Phan,Binh Thai Dang,Huynh Ho Ngo The Korean Society for Preventive Medicine 2023 예방의학회지 Vol.56 No.4
Objectives: The coronavirus disease 2019 (COVID-19) pandemic has increased the workload of healthcare workers (HCWs), impacting their health. This study aimed to assess sleep quality using the Pittsburgh Sleep Quality Index (PSQI) and identify factors associated with poor sleep among HCWs in Vietnam during the COVID-19 pandemic. Methods: In this cross-sectional study, 1000 frontline HCWs were recruited from various healthcare facilities in Vietnam between October 2021 and November 2021. Data were collected using a 3-part self-administered questionnaire, which covered demographics, sleep quality, and factors related to poor sleep. Poor sleep quality was defined as a total PSQI score of 5 or higher. Results: Participants' mean age was 33.20±6.81 years (range, 20.0-61.0), and 63.0% were women. The median work experience was 8.54±6.30 years. Approximately 6.3% had chronic comorbidities, such as hypertension and diabetes mellitus. About 59.5% were directly responsible for patient care and treatment, while 7.1% worked in tracing and sampling. A total of 73.8% reported poor sleep quality. Multivariate logistic regression revealed significant associations between poor sleep quality and the presence of chronic comorbidities (odds ratio [OR], 2.34; 95% confidence interval [CI], 1.17 to 5.24), being a frontline HCW directly involved in patient care and treatment (OR, 1.59; 95% CI, 1.16 to 2.16), increased working hours (OR, 1.84; 95% CI,1.37 to 2.48), and a higher frequency of encountering critically ill and dying patients (OR, 1.42; 95% CI, 1.03 to 1.95). Conclusions: The high prevalence of poor sleep among HCWs in Vietnam during the COVID-19 pandemic was similar to that in other countries. Working conditions should be adjusted to improve sleep quality among this population.
Hoang Nguyen(Hoang Nguyen ),Tu Phan Thanh(Tu Phan Thanh ),Hee-Cheol Moon(Hee-Cheol Moon),Binh Do(Binh Do ) The International Academy of Global Business and T 2023 The International Academy of Global Business and T Vol.19 No.3
Purpose - Given the significance of concerns raised about the global shift toward protectionism under trade policy uncertainty context, and echoed by requests to contribute to issues that concern a wider variety of stakeholders, this study aims to review new trade protection measures in response to the pandemic crisis and their effects on export performance from an emerging country’s exporters. Design/Methodology/Approach - Research data were gathered by surveying 613 export managers of different types of exporters in Vietnam from a list of exporters provided by Ministry of Industry and Trade, and then applied a regression model for analysis. Findings - The study demonstrated a negative relationship between firm export performance and six trade protectionism measures, including industrial subsidies, public-procurement restrictions, FDI restrictions, standards protectionism, green protectionism, and regional integration. Only restrictions on migrant workers had no appreciable impact on firm export performance. Additionally, only employee number, out of the three control factors, significantly and positively affected how well firms succeed in exporting. Research Implications - The study’s findings have significant ramifications and contributions to theory and practice in international trade for an emerging country to overcome new trade protectionism measures. To support firms in expanding export markets, the government of an emerging country should concentrate on establishing and developing policies to support exporters, especially small and medium enterprises. Firms should pursue a sustainable export strategy in light of the emergence of new trade protectionism in significant import markets.
Thanh-Hoang Phan,Van-Tu Nguyen,Duy-Trong Nguyen,Dong-Hyun Kim,Warn-Gyu Park 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
In this study, we aimed to explore the phase-change mechanisms and their effects on the cavitation bubble dynamics in a free-field condition over multiple cycles. A combination of a two-phase homogeneous mixture model and interface-capturing method was adopted to simulate the bubble dynamics. Complex phase-change mechanisms were evaluated to explore the major influence phenomenon on the bubble dynamics. By comparing with experimental data, a compatible bubble radius evolution under a free-field condition was obtained, particularly at the rebound and collapse stages. Disturbance secondary cavitation regions in the water field induced by rarefaction waves were observed immediately after the second rebound stage. In addition, bubble dynamic behaviors were mainly affected by the condensation mechanism. We found that the condensation phenomenon mainly occurs at the vapor–water bubble interfaces with a thin boundary layer.