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Zohreh Azarkar,Hamid Salehiniya,Toba Kazemi,Hamid Abbaszadeh 질병관리본부 2021 Osong Public Health and Research Persptectives Vol.12 No.3
ObjectivesCoronavirus disease 2019 (COVID-19) is a novel pandemic. Considerable differences in disease severity and the mortality rate have been observed in different parts of the world. The present study investigated the characteristics and outcomes of patients hospitalized with COVID-19 in Iran.MethodsWe established a retrospective cohort to study hospitalized COVID-19 patients in Iran. Epidemiological, imaging, laboratory, and clinical characteristics and outcomes were recorded from medical documents. The chi-square test, t-test, and logistic regression models were used to analyze the data. A p<0.05 was considered to indicate statistical significance.ResultsIn total, 364 cases (207 males and 157 females) were analyzed. The most common symptoms were cough, fever, and dyspnea. Multifocal bilateral ground-glass opacities with peripheral distribution were the predominant imaging finding. The mean age of patients was 54.28±18.81 years. The mean age of patients who died was 71.50±14.60 years. The mortality rate was 17.6%. The total proportion of patients with a comorbidity was 47.5%, and 84.4% of patients who died had a comorbidity. Sex, history of diabetes mellitus, and dyslipidemia were not significantly associated with mortality (p>0.05). However, mortality showed significant relationships with body mass index; age; history of hypertension, chronic kidney disease (CKD), ischemic heart disease, cerebrovascular accident (CVA), pulmonary disease, and cancer; and abnormal high-resolution computed tomography (HRCT) findings (p<0.05 for all). Cancer had the highest odds ratio.ConclusionComorbidities (especially cancer, CKD, and CVA), severe obesity, old age, and abnormal HRCT findings affected the health outcomes of patients hospitalized with COVID-19.
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Mohammad Amin Abbaszadeh,Hamed Hamidi,Hamid Rajabnejad,Seyed Abolfazl Naseri,Javad Vaseghi Amiri 한국강구조학회 2022 International Journal of Steel Structures Vol.22 No.3
Control of adjacent structures during an earthquake is one of the major challenges in engineering practices. Connecting two structures with the use of a damper is considered to be one of the eff ective vibration control and reducing damage approaches. Improving the seismic performance of weak structures by connecting them to substructures is an eff ective method. The type of dampers and the characteristics of input earthquake loading play an important role in the performance of connected buildings. In addition, some previous studies have shown that viscous dampers, besides the problem of sensitivity to temperature and oil leakage, could not be much eff ective against near-fault records. In this study, the vibration control of smaller frequency structures while connected to robust structures with two types of dampers (i.e., friction and yielding) was investigated Three distinctive sets of earthquake records were considered to be the excitation input data. To this end, three 3-, 5-, and 8-story buildings were selected and the eff ects of applying friction and yielding dampers to control their vibration while subjected to the abovementioned records were studied. The results imply that both dampers performed well when subjected to nearfault records; however, the performance varies depending on the type of earthquake. A maximum displacement reduction rate of 64% was observed. Friction and yielding dampers have shown more eff ective performance in the middle and at the top stories, respectively. As the number of stories increased, the eff ectiveness of lower stories dampers to reduce seismic responses decreased, so their application could be neglected.
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