This study employs computational fluid dynamics (CFD) simulations to evaluate the risk of airborne transmission COVID-19 in low-ceiling rooms, such as elevator cabins, under mechanical displacement ventilation. The take into account effects human body’s thermal environment and respiratory jet on pathogens. results are used propose a potential mitigation strategy based ventilation control reduce...

We developed a prototype laser monitor, consisting of a single laser sensor, to observe chest wall displacement during respiration. With this monitor, respiratory waveforms are expressed as an anterioposterior motion of the chest wall. The purpose of this study was to examine the characteristics and performance of this prototype. Performance was assessed: 1) under static conditions; 2) using a ...

Indoor ventilation is essential for a healthy and comfortable living environment. A key issue to discharge anthropogenic air contamination such as CO $_2$ gas or, of potentially more direct consequence, airborne respiratory droplets. Here, by employing numerical simulations, we study mechanical displacement with wide range rates $Q$ from 0.01 0.1 m $^3$ s $^{-1}$ person . For this scheme, cool ...

Key Findings Majorities of respondents have documented goals in place for help desk service availability, user satisfaction, and call/incident resolution. Important drivers of central IT help desk improvement include improving user satisfaction, meeting the changing needs of help desk clients, and improving help desk efficiency. Important obstacles to improving the help desk include rapid growt...

The technology help desk function has grown in importance as information technology has proliferated throughout the organization. The primary objective of the help desk is to resolve problems related to IT in the organization. As such, the agents in the help desk must be very knowledgeable of the information systems, applications, and technologies supported. Most efforts at improving help desk ...