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Machine learning-based seismic assessment of framed structures with soil-structure interaction

Frontiers of Structural and Civil Engineering 2023年第2期17卷 205-223页

作者： Mohamed NOURELDIN tabish ali Jinkoo KIM Department of Global Smart City Sungkyunkwan UniversitySuwon 16419Korea

The objective of the current study is to propose an expert system framework based on a supervised machine learning technique(MLT)to predict the seismic performance of low-to mid-rise frame structures considering soil-structure interaction(SSI).The methodology of the framework is based on examining different MLTs to obtain the highest possible accuracy for *** the MLT,a sensitivity analysis was conducted on the main SSI parameters to select the most effective input *** limit state criteria were used for the seismic evaluation within the process.A new global seismic assessment ratio was introduced that considers both serviceability and strength aspects by utilizing three different engineering demand parameters(EDPs).The proposed framework is novel because it enables the designer to seismically assess the structure,while simultaneously considering different EDPs and multiple limit ***,the framework provides recommendations for building component design based on the newly introduced global seismic assessment ratio,which considers different levels of seismic *** proposed framework was validated through comparison using non-linear time history(NLTH)*** results show that the proposed framework provides more accurate results than conventional ***,the generalization potential of the proposed framework was tested by investigating two different types of structural irregularities,namely,stiffness and mass *** results from the framework were in good agreement with the NLTH analysis results for the selected case studies,and peak ground acceleration(PGA)was found to be the most influential input parameter in the assessment process for the case study models *** proposed framework shows high generalization potential for low-to mid-rise structures.

关键词： seismic hazard artificial neural network soil-structure interaction seismic analysis

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Ergonomics of gastrointestinal endoscopies:Musculoskeletal injury among endoscopy physicians,nurses,and technicians

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World Journal of Gastrointestinal Endoscopy 2022年第3期14卷 142-152页

作者： Samana Zainab Shah Syed tabish Rehman Aysha Khan Muhammad Muneeb Hussain Mohsin ali Sonaila Sarwar Shahab Abid Department of Medicine Aga Khan University HospitalKarachi 74800SindhPakistan Department of Internal Medicine Baystate Medical CenterSpringfieldMA 01199United States

BACKGROUND Musculoskeletal injuries(MSI)have plagued endoscopists and ancillary staff for decades without any innovative and strong ergonomic *** has placed a physical and mental strain on our endoscopists and ancillary *** have very have limited data supporting this claim in our region and most data is supported by western *** To document the prevalence of MSI,and awareness and practices of ergonomics by endoscopists and ancillary *** This is an observational cross-sectional study,conducted in Karachi,a city that boasts the maximum number of daily endoscopies in the *** eleven-point self-administered questionnaire was distributed and used to evaluate MSI and ergonomic adjustments amongst three tertiary care setups in *** onsite survey via a 13-point checklist for endoscopy suite facilities was used to assess the ergonomically friendly conveniences at five tertiary care setups in Karachi.A total of 56 participants replied with a filled *** There were 56 participants in total with 39(69.6%)*** and numbness were documented by 75%of the patients,with pain in the neck(41.1%),lower back(32.1%),shoulder(21.4%),thumb(12.5%),hand(23.2%),elbow(8.9%),and carpal tunnel syndrome(CTS)(7.1%).Of those,33.3%attributed their symptoms to endoscopy, 14.2% said that symptoms were not caused by endoscopy, and 52.4% were notcertain whether endoscopy had caused their symptoms. Twenty-one point four percent of patientshad to take time off their work, while 33.9% took medications for pain. Ergonomic modifications toprevent musculoskeletal injury, including placement of endoscopic monitor at eye level and thecardiac monitor in front, stopping the procedure to move patients, sitting while performingcolonoscopy, and navigating height-adjustable bed were used by 21.4%. Nine out of 13 ergonomicfacilities were not present in all five tertiary care hospitals. Conveniences, such as anti-fatiguemats, height-adjustable computer stati

关键词： Endoscopy Ergonomics Injury Musculoskeletal Endoscopists Gastroenterologist

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