The current study investigates performance in two-stage production systems through the measurement of capacity utilization (CU). In short-run, the degree of capacity utilization depends on the ability of decision making units to utilize fixed production factors. To develop this indicator in two-stage production processes, a modified SBM network DEA model is proposed. A numerical example is also...

Traditional data envelopment analysis (DEA) models evaluate two-stage decision making unit (DMU) as a black box and neglect the connectivity may exist among the stages. This paper looks inside the system by considering the intermediate activities between the stages where the first stage uses inputs to produce outputs which are the inputs to the second stage along with its own inputs. Additional...

Abstract In recent years, Cyber Physical Production Systems and Digital Threads opened the vision on importance of data modelling management to lead smart factory towards a full-fledged vertical horizontal integration. Vertical integration refers full connection levels from work centers shop floor up business layer. Horizontal is realised when single participates in multiple interleaved supply ...

 Production data analysis techniques have been widely used for estimating reservoir properties such as gas in place and average pressure. Knowledge of this information is crucial for proper reservoir management. The present study discusses the roadmap, challenges and uncertainties for analyzing production data in an Iranian gas-condensate offshore field. This work is an integrated study in...

Maize (Zea mays L.) is an important crop among Brazilian smallholder farmers,who are also responsible for 40% of the poultry and egg production in the country.Although poultry litter is considered a potential pollutant, if properly stabilized anddistributed in the field it can be used as a source of nitrogen for maize production.In this study, the response of maize to mineral fertilizer and pou...

We model the capacity investment problem faced by pharmaceutical firms and other firms with long and risky product development cycles. These firms must balance two conflicting objectives: on one hand, the delay in scaling-up production once the product is approved must be minimized, and on the other hand, the risk of investing in ultimately unused capacity must be minimized. We develop a styliz...

The aerodynamic and acoustic phenomena involved in the production of fricative consonants are far from being completely understood. The overall Ievel and spectral characteristics of the radiated sound pressure are known to primarily depend on the aerodynamic state of the vocal tract, i.e. the pseudo-static pressure drop across the main oral constriction and the cross-sectional area of the const...

We show that the production rule mechanism provided by active database systems can be used to quickly and easily implement the logic rule interface of deductive database systems. Deductive rules specify derived relations using Datalog with built-in predicates and strati ed negation; the deductive rules are compiled automatically into production rules. We present a materialized approach, in whic...

In this paper we present an account of the publication of a suite of datasets, LEAPS, that collectively enable the evaluation of potential algal biomass production sites in North Western Europe. LEAPS forms the basis of a prototype Web application that enables stakeholders in the algal biomass domain to interactively explore via various facets, potential algal production sites and sources of th...