This paper considers the uncapacitated lot sizing problem with batch delivery, focusing on the general case of timedependent batch sizes. We study the complexity of the problem, depending on the other cost parameters, namely the setup cost, the fixed cost per batch, the unit procurement cost and the unit holding cost. We establish that if any one of the cost parameters is allowed to be time-dep...

BACKGROUND Traditional Lot Quality Assurance Sampling (LQAS) designs assume observations are collected using simple random sampling. Alternatively, randomly sampling clusters of observations and then individuals within clusters reduces costs but decreases the precision of the classifications. In this paper, we develop a general framework for designing the cluster(C)-LQAS system and illustrate t...

STEP System conventional gravity sewer system (like those used in large towns and cities) and a centralized wastewater treatment plant is the most cost-effective and environmentally-sound way to collect, transport, and treat the wastewater. In more sparsely populated areas, where lot sizes are large and homes are spaced widely apart, onsite wastewater treatment with subsurface discharge may be ...

Todays manufacturing industry faces big challenges. The market demands a very flexible production process which adjusts quickly to e.g. changing characteristics of the produced goods or different lot sizes and which tries to minimize production costs as much possible. In order to meet these challenges todays production control systems become more and more decentralized [GBFG96]. The building bl...

In the paper, a special approach to supply networks’ material flows is posed. The considered strategy is based on the both principles of Lean and agility, beside push and pull of materials. Here, the trade off between positioning of decoupling point throughout an exemplary network, and reduction of inventory level along throughput time is examined. Moreover, autonomous control for material rout...

OBJECTIVE To clarify the principles of a safe delivery based on Clinical Governance Criteria, as recommended by the pertinent experts. MATERIALS AND METHODS The current study was part of a qualitative research conducted by content analysis method in 2013 and purposive sampling, performing 24 in-depth interviews based on semi-structured questions and analyzed using thematic content analysis. T...

We discuss the formulation and results of a simple backpropagation approach to the control of wave soldering of printed circuit cards. Small lot sizes and a large number of different circuit card designs have complicated selection of the tunable process settings at the large manufacturer we worked with. Use of a neural network predictive model results in improved precision relative to the curre...

In this paper we outline a construction method which has been used for minimal blocking sets in PG(2, q) and maximal partial line spreads in PG(n, q) and which must have a lot of more applications. We also give a survey on what is known about the spectrum of sizes of maximal partial line spreads in PG(n, q). At the end we list some more elaborate random techniques used in finite geometry.