We analyze a tandem network of polling queues with two product types and stations. assume that external arrivals to the follow Poisson process, service times at each station are exponentially distributed. For this system, we determine mean conditional waiting time for an arriving customer using sample path analysis approach. The approach classifies system state upon arrival into scenarios explo...

This article addresses the issue of longer patient waiting time in the outpatient department (OPD) of a super specialty hospital attached to a manufacturing company in India. Due to longer waiting times at OPD, employees need to be away from the workplace for a longer duration. This problem was addressed through the Lean Six Sigma (LSS) methodology. The process, starting from registration of a ...

This paper represents linkage network of queues consisting of biserial and parallel servers linked to a common server in series with a flowshop scheduling system consisting of two machines. The significant transportation time of the jobs from one machine to another is also considered. Further, the completion time of jobs/customers (waiting time + service time) in the queue network is the set...

Background and aims: Visit quality is a crucial component of patient-physician interaction that its inadequacy can negatively influence the diagnosis and treatment efficiency. The waiting time and visit length are important determinants of quality in the outpatient care setting. Thus, the aim of this study was to determine waiting time and visit length and to compare them befor...

BACKGROUND Spontaneous very low frequency oscillations (VLFO), seen in the resting brain, are attenuated when individuals are working on attention demanding tasks or waiting for rewards (Hsu et al., 2013). Individuals with attention-deficit/hyperactivity disorder (ADHD) display excess VLFO when working on attention tasks. They also have difficulty waiting for rewards. Here we examined the waiti...

OBJECTIVE To assess the results achieved with a rapid referral pathway for suspected colorectal cancer (CRC), comparing with the standard referral pathway. METHODS Three-year audit of patients suspected of having CRC routed via a rapid referral pathway, and patients with CRC routed via the standard referral pathway of a health care district serving a population of 498,000 in Madrid (Spain). O...

In the context of public transportation system, improving the service quality and robustness through minimizing the average passengers waiting time is a real challenge. This study provides robust stochastic programming models for train timetabling problem in urban rail transit systems. The objective is minimization of the weighted summation of the expected cost of passenger waiting time, its va...