This paper analyzes an M/M/2 queueing system with two heterogeneous servers. Both servers goes on vacation when there is no customers waiting for service after this server 1 is always available but the other goes on vacation whenever server 2 is idle. The vacationing server however, returns to serve at a low rate as an arrival finds the other server busy. The system is analyzed in the steady st...

INTRODUCTION Drug shops are a major source of care for children in low income countries but they provide sub-standard care. We assessed the feasibility and effect on quality of care of introducing diagnostics and pre-packaged paediatric-dosage drugs for malaria, pneumonia and diarrhoea at drug shops in Uganda. METHODS We adopted and implemented the integrated community case management (iCCM) ...

INTRODUCTION Vape shops are popular brick-and-mortar stores that sell e-cigarette products but are not understood well. Previous analysis of Yelp reviews of vape shops located in various ethnic neighborhoods in Los Angeles, California in 2014 identified characteristics of vape shop as delineated by consumers. In this study, we assessed the associations between these characteristics and vape sho...

Industrial and academic interest converge on scheduling flow shops with sequence- time-dependent maintenance. We posit that anticipatory, integrated of operational maintenance tasks leads to superior performance purely ‘wait-then-fix’ handling the tasks. Motivated by an industrial problem (sequence dependent) setup times, maximum separation constraints, a combination time- dependent tasks, this...

Abstract The connection between production scheduling and transportation is getting closer in smart manufacturing system, both of those problems are summarized as NP-hard problems. However, only a few studies have considered them simultaneously. This paper solves the integrated problem (IPTSP) hybrid flow shops, which an extension shop (HFSP). In addition to on machines, process automated guide...

Even a fully loaded computer system, where the bottleneck resource is constantly busy, often has some idle capacities available on other resources. This proposal argues for using these idle capacities speculatively, increasing system performance for correct predictions. In such a system, all resources will ideally be constantly loaded with either regular foreground tasks, or speculative idle-ti...

A study on the prevalence and levels of Campylobacter, Salmonella and E. coli on broiler chicken carcasses, wash and rinse water from pluck shops/ cottage poultry processors (CPP) in county Nariva Mayaro Trinidad was done. There are 21 pluck shops/ cottage poultry processors in the county, 14 pluck shops were randomly selected for the study. Samples consisted of 28 broiler carcasses, 14 wash wa...

OBJECTIVE To determine whether non-pharmaceutical retail outlets are aboding to the current Medicines and Healthcare products Regulatory Agency (MHRA) national guidelines for over-the-counter (OTC) sales of aspirin and paracetamol. METHODS Stages 1 and 2 of the study deployed eight and four medical students, respectively, to undertake a mystery shopper style investigation. Stage 1: eight medi...