Smart Grid systems are kind of System of Systems with distributed and highly heterogeneous software connected to provide various services. Early knowledge of defect prone parts is useful for improving the safety and maintenance of these kinds of systems. We report the results of an empirical study of using reused components to predict future defective components in a type of open source Smart G...

We study a problem of lot-sizing and sequencing several discrete products on a single machine. A sequence dependent setup time is required between the lots of different products. The machine is imperfect in the sense that it can produce defective items, and furthermore, it can break down. The number of the defective items of each product is given as an integer valued non-decreasing function of ...

We study the impact of the efforts aimed at reducing the lead-time variability in a quality-adjusted stochastic inventory model. We assume that each lot contains a random number of defective units. More specifically, a logarithmic investment function is used that allows investment to be made to reduce lead-time variability. Explicit results for the optimal values of decision variables as well a...

OBJECTIVE To explore the quality and safety of medicines in Canada. DESIGN A retrospective review of drug recalls and risk communication documents conveying issues relating to defective (ie, substandard and falsified) medicines. SETTING The Health Canada website search for drug recalls and risk communication documents issued between 2005 and 2013. ELIGIBILITY CRITERIA Drug recalls and ris...

The synthesis of ZnO porous nanobelts with high surface-to-volume ratio is envisaged to enhance the zinc oxide sensing and photocatalytic properties. Yet, controlled stoichiometry, doping and compensation of as-grown n-type behavior remain open problems for this compound. Here, we demonstrate the effect of residual sulfur atoms on the optical properties of ZnO highly porous, albeit purely wurtz...

EPQ model; Replenishment lot size; Multiple deliveries; Random defective items; Production; Rework; Scrap items. Abstract This paper derives the optimal replenishment lot size and shipment policy for an Economic Production Quantity (EPQ) model with multiple deliveries and rework of random defective items. The classic EPQmodel assumes a continuous inventory issuing policy for satisfying demand a...

objective: this study was carried out to clarify the potential health-risk and to determinant the prevalence of antenatal rubella infection in north-central, nigeria. materials and methods: a descriptive cross-sectional survey was carried out among pregnant women to establish the knowledge, attitude and practices with regards to antenatal rubella infection in early pregnancy in ilorin. a total ...