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time-series MODELI NG AND FAULT FORECAST STUDY ON SPECTRAL ANALYSIS OF LUBRICATING OIL

Transactions of Nanjing University of Aeronautics and Astronautics 2001年第1期18卷 86-90页

作者：干敏梁杨忠南京航空航天大学民航学院南京工程学院动力系

The application of ti me-series modeling and forecasting method to the spectral analysis for lubricat ing oil of mechanical equipment is discussed. The AR model is used to perform a time-series modeling and forecasting analysis for the spectral analysis data co llected from aero-engines. In the oil condition monitoring field of mechanical equipment, the use of the method of time-series analysis has rarely been report ed. As indicated in the satisfactory example, a practical method for condition m onitoring and fault forecasting of mechanical equipment has been achieved.

关键词： spectral analysis tren ds forecasting condition monitoring time-series modeling

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Role of children in the Bulgarian COVID-19 epidemic:A mathematical model study

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World Journal of Experimental Medicine 2023年第3期13卷 28-46页

作者： Latchezar Tomov Hristiana Batselova Snezhina Lazova Borislav Ganev Iren Tzocheva Tsvetelina Velikova Department of Informatics New Bulgarian UniversitySofia 1618Bulgaria Department of Epidemiology and Disaster Medicine Medical UniversityUniversity Hospital"St George"Plovdiv 6000Bulgaria Department of Pediatric University Hospital"N.I.Pirogov"Sofia 1606Bulgaria Department of Healthcare Faculty of Public HealthMedical University of SofiaSofia 1527Bulgaria Department of Pediatric Medical FacultyUniversity Hospital"N.I.Pirogov"Sofia 1606Bulgaria Medical Faculty Sofia UniversitySt.Kliment OhridskiSofia 1407Bulgaria

BACKGROUND The coronavirus disease 2019(COVID-19)pandemic affects all aspects of our lives,including *** the advancement of the pandemic,children under five years old are at increased risk of hospitalization relative to other age *** makes it paramount that we develop tools to address the two critical aspects of preserving children's health–new treatment protocols and new predictive *** those purposes,we need to understand better the effects of COVID-19 on children,and we need to be able to predict the number of affected children as a proportion of the number of infected *** is why our research focuses on clinical and epidemiological pictures of children with heart damage post-COVID,as a part of the general picture of post-COVID among this age *** To demonstrate the role of children in the COVID-19 spread in Bulgaria and to test the hypothesis that there are no secondary transmissions in schools and from children to *** Our modeling and data show with high probability that in Bulgaria,with our current measures,vaccination strategy and contact structure,the pandemic is driven by the children and their contacts in *** This makes it paramount that we develop tools to address the two critical aspects of preserving children's health–new treatment protocols and new predictive *** those purposes,we need to understand better the effects of COVID-19 on children,and we need to be able to predict the number of affected children as a proportion of the number of infected *** is why our research focuses on clinical and epidemiological pictures of children with heart damage post-COVID,as a part of the general picture of post-Covid among this age *** Our modeling rejects that hypothesis,and the epidemiological data supports *** used epidemiological data to support the validity of our *** first summer wave in 2020 from the listed here school proms endorse the idea of transmissio

关键词： COVID-19 Pandemic Children Cardiac involvement Multisystem inflammation in children ARIMA time-series modeling Regression model

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