We consider a dynamic control problem for a GI/GI/1 + GI queue with multiclass customers. The customer classes are distinguished by their interarrival time, service time, and abandonment time distributions. There is a cost ck > 0 for every class k ∈ {1,2, . . . ,N} customer that abandons the queue before receiving service. The objective is to minimize average cost by dynamically choosing which ...

The purpose of this study was to clarify the level residents' awareness parks, usage patterns and frequency use during COVID-19 pandemic. As case Maebashi City, Gunma Prefecture. method a questionnaire survey determine satisfaction with their quality life expectations for new green policies about Green Infrastructure (GI) Park-Private Finance Initiative (Park-PFI). five factors extracted by fac...

background: gastrointestinal and liver diseases (gild) are among the most common causes of morbidity and substantial proportion of mortality with enormous economic consequences in iran. we aimed to collect and report the most recent statistics on deaths, symptoms, physician visits, and hospitalizations for common gastrointestinal and liver diseases in gastrointestinal referral centers of tehran...

Radiocarbon dates of organic sediments, taken from the soil horizon, gyttja, peats, plant remains and mineral-organic sediments – silts silty-sandy with admixture material were collected analysed. Age determinations made for samples over a number years upper part Piaski Szerokie Formations in Bełchatów Lignite Open Cast Mine (28 dates) their surroundings (2 (Fig. 1; Tab. 1). The analysed are ma...

We establish the validity of the heavy traffic steady-state approximation for a single server queue, operating under the FIFO service discipline, in which each customer abandons the system if his waiting time exceeds his generally-distributed patience time. This follows from early results of Kingman when the loading factor approaches one from below, but has not been shown in more generality. We...

Objective. This retrospective cohort study evaluated the effects of whole body therapeutic hypothermia (WBTH) on gastrointestinal (GI) morbidity and feeding tolerance in infants with moderate-to-severe hypoxic ischemic encephalopathy (HIE). Study Design. Infants ≥ 35 weeks gestational age and ≥1800 grams birth weight with moderate-to-severe HIE treated from 2000 to 2012 were compared. 68 patien...