Learn More
BACKGROUND Chronic obstructive pulmonary disease and emphysema are a frequent result of long-term smoking, but the exact mechanisms, specifically which types of cells are associated with the lung destruction, are unclear. METHODS AND FINDINGS We studied different subsets of lymphocytes taken from portions of human lungs removed surgically to find out(More)
We empirically explore the, accuracy of an easily computed approximation for long run, average performance measures such as expected delay and probability of delay in multiserver queueing systems with exponential service times and periodic (sinusoidal) Poisson arrival processes. The pointwise stationary approximation is computed by integrating over time(More)
Many organizations, such as banks, airlines, telecommunications companies, and police departments, routinely use queueing models to help determine capacity levels needed to respond to experienced demands in a timely fashion. Though queueing analysis has been used in hospitals and other healthcare settings, its use in this sector is not widespread. Yet,(More)
RATIONALE Data about the influence of the type of sedation on yield, complications, and tolerance of endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA) are based mostly on retrospective studies and are largely inconsistent. OBJECTIVES To determine whether the type of sedation influences the diagnostic yield of EBUS-TBNA, its(More)
BACKGROUND This study implemented and evaluated a point-of-care, wireless Internet access using smart phones for information retrieval during daily clinical rounds and academic activities of internal medicine residents in a community hospital. We did the project to assess the feasibility of using smart phones as an alternative to reach online medical(More)
Automated multidisciplinary design of aircraft and other ight vehicles requires the optimization of complex performance objectives with respect to a number of design parameters and constraints. The eeect of these independent design variables on the system performance criteria can be quantiied in terms of sensitivity derivatives which must be calculated and(More)