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Yi-Tui Chen
Department of Health Care Management, National Taipei University of Nursing and Health Sciences, 89, Nei-Chiang St. Wan-Hua Dist., Taipei 108, Taiwan

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Journal article
Published: 14 July 2021 in International Journal of Environmental Research and Public Health
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Although vaccination is carried out worldwide, the vaccination rate varies greatly. As of 24 May 2021, in some countries, the proportion of the population fully vaccinated against COVID-19 has exceeded 50%, but in many countries, this proportion is still very low, less than 1%. This article aims to explore the impact of vaccination on the spread of the COVID-19 pandemic. As the herd immunity of almost all countries in the world has not been reached, several countries were selected as sample cases by employing the following criteria: more than 60 vaccine doses per 100 people and a population of more than one million people. In the end, a total of eight countries/regions were selected, including Israel, the UAE, Chile, the United Kingdom, the United States, Hungary, and Qatar. The results find that vaccination has a major impact on reducing infection rates in all countries. However, the infection rate after vaccination showed two trends. One is an inverted U-shaped trend, and the other is an L-shaped trend. For those countries with an inverted U-shaped trend, the infection rate begins to decline when the vaccination rate reaches 1.46–50.91 doses per 100 people.

ACS Style

Yi-Tui Chen. The Effect of Vaccination Rates on the Infection of COVID-19 under the Vaccination Rate below the Herd Immunity Threshold. International Journal of Environmental Research and Public Health 2021, 18, 7491 .

AMA Style

Yi-Tui Chen. The Effect of Vaccination Rates on the Infection of COVID-19 under the Vaccination Rate below the Herd Immunity Threshold. International Journal of Environmental Research and Public Health. 2021; 18 (14):7491.

Chicago/Turabian Style

Yi-Tui Chen. 2021. "The Effect of Vaccination Rates on the Infection of COVID-19 under the Vaccination Rate below the Herd Immunity Threshold." International Journal of Environmental Research and Public Health 18, no. 14: 7491.

Journal article
Published: 18 June 2021 in Healthcare
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The purpose of this paper was to compare the relative efficiency of COVID-19 transmission mitigation among 23 selected countries, including 19 countries in the G20, two heavily infected countries (Iran and Spain), and two highly populous countries (Pakistan and Nigeria). The mitigation efficiency for each country was evaluated at each stage by using data envelopment analysis (DEA) tools and changes in mitigation efficiency were analyzed across stages. Pearson correlation tests were conducted between each change to examine the impact of efficiency ranks in the previous stage on subsequent stages. An indicator was developed to judge epidemic stability and was applied to practical cases involving lifting travel restrictions and restarting the economy in some countries. The results showed that Korea and Australia performed with the highest efficiency in preventing the diffusion of COVID-19 for the whole period covering 105 days since the first confirmed case, while the USA ranked at the bottom. China, Japan, Korea, and Australia were judged to have recovered from the attack of COVID-19 due to higher epidemic stability.

ACS Style

Emily Su; Cheng-Hsing Hsiao; Yi-Tui Chen; Shih-Heng Yu. An Examination of COVID-19 Mitigation Efficiency among 23 Countries. Healthcare 2021, 9, 755 .

AMA Style

Emily Su, Cheng-Hsing Hsiao, Yi-Tui Chen, Shih-Heng Yu. An Examination of COVID-19 Mitigation Efficiency among 23 Countries. Healthcare. 2021; 9 (6):755.

Chicago/Turabian Style

Emily Su; Cheng-Hsing Hsiao; Yi-Tui Chen; Shih-Heng Yu. 2021. "An Examination of COVID-19 Mitigation Efficiency among 23 Countries." Healthcare 9, no. 6: 755.

Reply
Published: 02 November 2020 in International Journal of Environmental Research and Public Health
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We greatly appreciate Idrovo’s comments on our research and wish to specifically respond to his comments. Idrovo indicates that rapid increases in the number of confirmed cases in the past few weeks were observed in Latin America, where some countries had implemented stringent lockdowns for more than three months since the second half of March 2020. In his comments, Idrovo expresses his suspicion on the reality of lockdowns implemented in Latin America and worries about the negative impacts of lockdowns on economies. We thank the Editor for providing us with the opportunity to respond to Idrovo’s comments and explain parts of our study.

ACS Style

Yi-Tui Chen; Yung-Feng Yen; Shih-Heng Yu; Emily Chia-Yu Su. A Flexible Lockdown by Integrating Public Health and Economic Reactivation to Response the Crisis of COVID-19: Responses to Comments by Alvaro J Idrovo on “An Examination on the Transmission of COVID-19 and the Effect of Response Strategies: A Comparative Analysis”. International Journal of Environmental Research and Public Health 2020, 17, 8068 .

AMA Style

Yi-Tui Chen, Yung-Feng Yen, Shih-Heng Yu, Emily Chia-Yu Su. A Flexible Lockdown by Integrating Public Health and Economic Reactivation to Response the Crisis of COVID-19: Responses to Comments by Alvaro J Idrovo on “An Examination on the Transmission of COVID-19 and the Effect of Response Strategies: A Comparative Analysis”. International Journal of Environmental Research and Public Health. 2020; 17 (21):8068.

Chicago/Turabian Style

Yi-Tui Chen; Yung-Feng Yen; Shih-Heng Yu; Emily Chia-Yu Su. 2020. "A Flexible Lockdown by Integrating Public Health and Economic Reactivation to Response the Crisis of COVID-19: Responses to Comments by Alvaro J Idrovo on “An Examination on the Transmission of COVID-19 and the Effect of Response Strategies: A Comparative Analysis”." International Journal of Environmental Research and Public Health 17, no. 21: 8068.

Journal article
Published: 06 August 2020 in International Journal of Environmental Research and Public Health
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The major purpose of this paper was to examine the transmission of COVID-19 and the associated factors that affect the transmission. A qualitative analysis was conducted by comparing the COVID-19 transmission of six countries: China, Korea, Japan, Italy, the USA, and Brazil. This paper attempted to examine the mitigation effectiveness for the transmission of COVID-19 and the pandemic severity. Time to reach the peak of daily new confirmed cases and the maximum drop rate were used to measure the mitigation effectiveness, while the proportion of confirmed cases to population and the mortality rate were employed to evaluate the pandemic severity. Based on the mitigation effectiveness, the pandemic severity, and the mortality rate, the six sample countries were categorized into four types: high mitigation effectiveness vs. low pandemic severity, middle mitigation effectiveness vs. low pandemic severity, high mitigation effectiveness vs. high pandemic severity, and low mitigation effectiveness vs. high pandemic severity. The results found that Korea and China had relatively higher mitigation effectiveness and lower pandemic severity, while the USA and Brazil had the opposite. This paper suggests that viral testing together with contacts tracing, strict implementation of lockdown, and public cooperation play important roles in achieving a reduction in COVID-19 transmission.

ACS Style

Yi-Tui Chen; Yung-Feng Yen; Shih-Heng Yu; Emily Chia-Yu Su. An Examination on the Transmission of COVID-19 and the Effect of Response Strategies: A Comparative Analysis. International Journal of Environmental Research and Public Health 2020, 17, 5687 .

AMA Style

Yi-Tui Chen, Yung-Feng Yen, Shih-Heng Yu, Emily Chia-Yu Su. An Examination on the Transmission of COVID-19 and the Effect of Response Strategies: A Comparative Analysis. International Journal of Environmental Research and Public Health. 2020; 17 (16):5687.

Chicago/Turabian Style

Yi-Tui Chen; Yung-Feng Yen; Shih-Heng Yu; Emily Chia-Yu Su. 2020. "An Examination on the Transmission of COVID-19 and the Effect of Response Strategies: A Comparative Analysis." International Journal of Environmental Research and Public Health 17, no. 16: 5687.

Journal article
Published: 23 April 2020 in International Journal of Environmental Research and Public Health
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Background: Emergency treatments determined by emergency physicians may affect mortality and patient satisfaction. This paper attempts to examine the impact of patient characteristics, health status, the accredited level of hospitals, and triaged levels on the following emergency treatments: immediate life-saving interventions (LSIs), computed tomography (CT) scans, and specialist consultations (SCs). Methods: A multivariate logistic regression model was employed to analyze the impact of patient characteristics, including sex, age, income and the urbanization degree of the patient’s residence; patient health status, including records of hospitalization and the number of instances of ambulatory care in the previous year; the Charlson Comorbidity Index (CCI) score; the accredited level of hospitals; and the triaged level of emergency treatments. Results: All the patient characteristics were found to impact receiving LSI, CT and SC, except for income. Furthermore, a better health status was associated with a decreased probability of receiving LSI, CT and SC, but the number of instances of ambulatory care was not found to have a significant impact on receiving CT or SC. This study also found no evidence to support impact of CCI on SC. Hospitals with higher accredited levels were associated with a greater chance of patients receiving emergency treatments of LSI, CT and SC. A higher assigned severity (lower triaged level) led to an increased probability of receiving CT and SC. In terms of LSI, patients assigned to level 4 were found to have a lower chance of treatment than those assigned to level 5. Conclusions: This study found that several patient characteristics, patient health status, the accredited level of medical institutions and the triaged level, were associated with a higher likelihood of receiving emergency treatments. This study suggests that the inequality of medical resources among medical institutions with different accredited levels may yield a crowding-out effect.

ACS Style

Chu-Chieh Chen; Chin-Yi Chen; Ming-Chung Ko; Yi-Chun Chien; Emily Chia-Yu Su; Yi-Tui Chen. Factors Affecting Treatment with Life-Saving Interventions, Computed Tomography Scans and Specialist Consultations. International Journal of Environmental Research and Public Health 2020, 17, 2914 .

AMA Style

Chu-Chieh Chen, Chin-Yi Chen, Ming-Chung Ko, Yi-Chun Chien, Emily Chia-Yu Su, Yi-Tui Chen. Factors Affecting Treatment with Life-Saving Interventions, Computed Tomography Scans and Specialist Consultations. International Journal of Environmental Research and Public Health. 2020; 17 (8):2914.

Chicago/Turabian Style

Chu-Chieh Chen; Chin-Yi Chen; Ming-Chung Ko; Yi-Chun Chien; Emily Chia-Yu Su; Yi-Tui Chen. 2020. "Factors Affecting Treatment with Life-Saving Interventions, Computed Tomography Scans and Specialist Consultations." International Journal of Environmental Research and Public Health 17, no. 8: 2914.

Journal article
Published: 03 April 2019 in International Journal of Environmental Research and Public Health
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This paper examines the capacity determination factors of medical services at a national level through the analysis of a mathematical model that maximizes social welfare, which consists of the consumption of private goods and the medical capacity provided by the society. A sensitivity analysis is conducted to investigate the impact of these factors on the medical capacity provided. Furthermore, a case example based on the data provided by the government is presented to discuss the results derived from the theoretical analysis. The results of the sensitivity analysis indicate that individual disposable income, the medical expenditure for each treatment, the level of premium payments, and substitution parameters have a positive impact on medical capacity, while the medical costs and preference parameter negatively affect medical capacity. The results of the correlation analysis based on the data of the case example are consistent with the findings of the theoretical analysis.

ACS Style

Yi-Tui Chen. An Examination of the Determination of Medical Capacity under a National Health Insurance Program. International Journal of Environmental Research and Public Health 2019, 16, 1206 .

AMA Style

Yi-Tui Chen. An Examination of the Determination of Medical Capacity under a National Health Insurance Program. International Journal of Environmental Research and Public Health. 2019; 16 (7):1206.

Chicago/Turabian Style

Yi-Tui Chen. 2019. "An Examination of the Determination of Medical Capacity under a National Health Insurance Program." International Journal of Environmental Research and Public Health 16, no. 7: 1206.

Journal article
Published: 20 September 2018 in International Journal of Environmental Research and Public Health
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In recent decades, many researchers have focused on the issue of medical failures in the healthcare industry. A variety of techniques have been employed to assess the risk of medical failure and to generate strategies to reduce the frequency of medical failures. Considering the limitations of the traditional method—failure mode and effects analysis (FMEA)—for risk assessment and quality improvement, this paper presents two models developed using data envelopment analysis (DEA). One is called the slacks-based measure DEA (SBM-DEA) model, and the other is a novel data-driven approach (NDA) that combines FMEA and DEA. The relative advantages of the three models are compared. In this paper, an infant security case consisting of 16 failure modes at Western Wake Medical Center in Raleigh, North Carolina, U.S., was employed. The results indicate that both SBM-DEA and NDA may improve the discrimination and accuracy of detection compared to the traditional method of FMEA. However, NDA was found to have a relative advantage over SBM-DEA due to its risk assessment capability and precise detection of medical failures.

ACS Style

Shih-Heng Yu; Emily Chia-Yu Su; Yi-Tui Chen. Data-Driven Approach to Improving the Risk Assessment Process of Medical Failures. International Journal of Environmental Research and Public Health 2018, 15, 2069 .

AMA Style

Shih-Heng Yu, Emily Chia-Yu Su, Yi-Tui Chen. Data-Driven Approach to Improving the Risk Assessment Process of Medical Failures. International Journal of Environmental Research and Public Health. 2018; 15 (10):2069.

Chicago/Turabian Style

Shih-Heng Yu; Emily Chia-Yu Su; Yi-Tui Chen. 2018. "Data-Driven Approach to Improving the Risk Assessment Process of Medical Failures." International Journal of Environmental Research and Public Health 15, no. 10: 2069.

Journal article
Published: 25 December 2017 in Sustainability
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The purpose of this paper is to compare the recycling performance for some waste fractions selected including food waste, bulk waste, paper, metal products, plastics/rubber and glass products and then to develop some directions for the future improvements. The priority of each waste fraction for recycling is also analyzed by using an importance-performance analysis. Traditionally, the recycling rate that is calculated by the ratio of waste recycled to waste collected is used as an indicator to measure recycling performance. Due to a large variation among waste fractions in municipal solid waste (MSW), the recycling rate cannot reflect the actual recycling performance. The ceiling of recycling rate for each waste fraction estimated from the diffusion models is incorporated into a model to calculate recycling performance. The results show that (1) the diffusion effect exists significantly for the recycling of most recyclables but no evidence is found to support the diffusion effect for the recycling of food waste and bulk waste; (2) the recycling performance of waste metal products ranks the top, compared to waste paper, waste glass and other waste fractions; (3) furthermore, an importance-performance analysis (IPA) is employed to analyze the priority of recycling programs and thus this paper suggests that the recycling of food waste should be seen as the most priority item to recycle.

ACS Style

Yi-Tui Chen; Fu-Chiang Yang; Shih-Heng Yu. The Diffusion Effect of MSW Recycling. Sustainability 2017, 10, 40 .

AMA Style

Yi-Tui Chen, Fu-Chiang Yang, Shih-Heng Yu. The Diffusion Effect of MSW Recycling. Sustainability. 2017; 10 (2):40.

Chicago/Turabian Style

Yi-Tui Chen; Fu-Chiang Yang; Shih-Heng Yu. 2017. "The Diffusion Effect of MSW Recycling." Sustainability 10, no. 2: 40.

Journal article
Published: 21 August 2017 in Sustainability
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This article attempts to examine the factors affecting residential electricity consumption through two approaches, a socioeconomic perspective and a direct use perspective. The results of this study find that gross domestic product (GDP), employment rates, residential space, and the implementation of energy labeling schemes provide significant impacts on residential electricity consumption. However, the impacts of electricity price and the energy efficiency standards do not receive significant support. The analysis of the direct use approach finds that air conditioners consume the largest portion of electricity, amounting to 1470 kWh for each household and accounting for 26.81% except for lighting. Refrigerators and rice cookers follow, consuming 815.83 kWh (14.88%) and 343.85 kWh (6.27%) of electricity. The correlation analysis reveals that GDP keeps a high relationship with the installation of electrical appliances and eventually leads to an increase in residential electricity consumption. By integrating the results obtained from these two approaches, this paper also discusses some improvement strategies. The results, derived from the case example of Taiwan’s residential electricity consumption, may provide valuable information for policy-making involving green labeling, energy standards, and electricity prices.

ACS Style

Yi-Tui Chen. The Factors Affecting Electricity Consumption and the Consumption Characteristics in the Residential Sector—A Case Example of Taiwan. Sustainability 2017, 9, 1484 .

AMA Style

Yi-Tui Chen. The Factors Affecting Electricity Consumption and the Consumption Characteristics in the Residential Sector—A Case Example of Taiwan. Sustainability. 2017; 9 (8):1484.

Chicago/Turabian Style

Yi-Tui Chen. 2017. "The Factors Affecting Electricity Consumption and the Consumption Characteristics in the Residential Sector—A Case Example of Taiwan." Sustainability 9, no. 8: 1484.

Journal article
Published: 22 November 2016 in Sustainability
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Taiwan’s Environmental Protection Administration (EPA) has enacted a food waste recycling policy since 2003 as an alternative of landfill and incineration for the final disposal of municipal solid waste. Recycled food waste is currently seen as a valuable material, especially when appropriate technology is developed. This paper conducts a cost/benefit analysis based on six cases of food waste composting plants in Taiwan, finding that (1) the composting of food waste may yield the most net benefit compared to other applications of today; (2) the production cost of compost ranges from NT$ 2897–23,117/tonne; (3) the adoption of more automatic technology may reduce operation costs and, thus, a closed composting system with mechanical aeration may be more cost effective; (4) the output is a determinant of affecting production costs and private firms are more competitive in production costs than government-affiliated composting units; (5) all of the government-affiliated composting units face a negative profit and thus they are required to make use of the market value of the produced compost to achieve economic viability; and (6) a subsidy to the compost producer is needed to expand the market demand as the food waste recycled can save the disposal cost of municipal solid waste (MSW) incineration.

ACS Style

Yi-Tui Chen. A Cost Analysis of Food Waste Composting in Taiwan. Sustainability 2016, 8, 1210 .

AMA Style

Yi-Tui Chen. A Cost Analysis of Food Waste Composting in Taiwan. Sustainability. 2016; 8 (11):1210.

Chicago/Turabian Style

Yi-Tui Chen. 2016. "A Cost Analysis of Food Waste Composting in Taiwan." Sustainability 8, no. 11: 1210.

Journal article
Published: 02 December 2011 in Clean Technologies and Environmental Policy
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We employ a logistic model to examine the impacts of environmental policy (emission standards and economic instruments) and plant characteristics on clean technology diffusion by using the amount of total suspended particulate (TSP), sulfur oxide (SO x ), and nitric oxide (NO x ) emissions in 14 power plants provided by Taiwan Power Company covering the period of 1989–2006. The concentration of the pollutants emitted to air from fossil-fired power plants is modeled as the performance of technology development. The objective of this study is to investigate the determinants of technology diffusion to help generate strategic insights on environmental policy. The results show that the environmental policy by regulating emission standard provides a negative effect on technology diffusion while the ‘mixed policy’ (an integration of environmental standards and economic instruments) has a significantly positive effect on technology diffusion for NO x but insignificantly for TSP and SO x .

ACS Style

Yi-Tui Chen; Dong-Shang Chang; Chia-Yon Chen; Chu-Chieh Chen. The policy impact on clean technology diffusion. Clean Technologies and Environmental Policy 2011, 14, 699 -708.

AMA Style

Yi-Tui Chen, Dong-Shang Chang, Chia-Yon Chen, Chu-Chieh Chen. The policy impact on clean technology diffusion. Clean Technologies and Environmental Policy. 2011; 14 (4):699-708.

Chicago/Turabian Style

Yi-Tui Chen; Dong-Shang Chang; Chia-Yon Chen; Chu-Chieh Chen. 2011. "The policy impact on clean technology diffusion." Clean Technologies and Environmental Policy 14, no. 4: 699-708.