A real economic growth only comes from increasing quality and quantity of the factors of production. Most production systems produce items which are of imperfect quality. In a production/inventory situation items which are received or produced are not of perfect quality. Thus the presence of defects which is inevitable in a produced/ordered lot is sorted out by the process of screening. Handlin...

This experience report illustrates the implementation of metrics about rework in Systems Engineering at Thales Airborne Systems. It explains how models and quantification of rework contribute to reduce waste in development processes. This paper is based upon our real experiences. Therefore, it could be considered as an industrial contribution to share this concept in Systems / Products Developm...

This study is concerned with the optimal common cycle time for a multi-item production system with discontinuous delivery and failure in rework. In real life manufacturing environments, managements often plan to produce multiple products in turn on a single machine in order to maximize machine utilization. Also, dealing with random defective items during production seems to be an inevitable tas...

This paper examines an economic production quantity (EPQ) model with rework and service level constraint. First, we prove that the expected overall costs for an imperfect EPQ model with backlogging permitted is less than or equal to that of the one without backlogging. Secondly, the relationship between “imputed backorder cost” and maximal shortage level is derived for decision-making on whethe...

The bottleneck (BN) of a production system is a machine with the strongest effect on the system’s throughput. In this paper, a method for BN identification in serial lines with rework and Bernoulli machines is developed. In addition, the paper provides two system-theoretic results: First, it demonstrates that BNs may be shifting not only because of changes in machine and buffer parameters but a...

We analyze a one machine scheduling problem subject to breakdowns and preventive maintenance. The primary objective in this work is to minimize the capacity loss due to rework resulting from breakdowns and potential capacity loss due to unnecessary maintenance. We propose a model where the timeline is split into two alternating regions as risk free and risky regions by assuming that the machine...

The construction of E∞ ring spaces and thus E∞ ring spectra from bipermutative categories gives the most highly structured way of obtaining the K-theory commutative ring spectra. The original construction dates from around 1980 and has never been superseded, but the original details are difficult, obscure, and slightly wrong. We rework the construction in a much more elementary fashion.

This paper presents an empirical study in an industrial context on the production of software using a framework. Frameworks are semi-complete applications, usually implemented as a hierarchy of classes. The framework is developed first; then several applications are derived from it. Frameworks are a reuse technique that supports the engineering of product lines. In the study we compare quality ...

When the work and reputation of scientists suffer ritual degradation, a range of tactics can be deployed to resist and rework the psychological and social impacts. Five key resistance tactics to degradation in science are revealing degradation rituals, redeeming the reputation of the targeted scientist, reframing the degradation as unfair, redirecting attention to other domains, and refusing to...

Cardenas-Barron [L.E. Cardenas-Barron, Economic production quantity with rework process at a single-stage manufacturing system with planned backorders, Computers and Industrial Engineering 57 (2009) 1105–1113] minimizes the annual total relevant cost TC(Q , B) to find the economic production quantitywith rework process at amanufacturing system and assumes that TC(Q , B) is convex. So, the solut...