This paper considers the basic economic order quantity (EOQ) model when all parameters, such as the demand rate, the ordering cost, and the inventory holding cost, are uncertain, and furthermore, their probability information is also unknown. To address the uncertainty, we adopt a robustness-based approach. In this approach, each unknown parameter is described as a continuous value restricted t...

This paper presents results of investigations of children’s use of referring expressions in spontaneous conversation with adults, and considers possible implications of this work for questions relating to development of a theory of mind. The study further confirms previous findings that children use the full range of referring forms (definite and indefinite articles, demonstrative determiners, ...

Deciding shipment size is important in freight transport: it depends on the logistical imperatives of shippers and the technical possibilities of carriers. Shipment size choice is also closely related to transportation mode; it is therefore important from a public policy perspective. The theory of optimal shipment size and mode choice is robust. There are many inventory-theoretical models of op...

We review historical patterns of "economic geography" for the United States from the colonial period to the present day. The analysis is framed in terms of two geographic scales: regions and cities. The compelling reason for studying geographic areas of different scales is that models that explain the location of economic activities at one scale many not apply to other scales. We consider the p...

1.1 The question how much income inequality is acceptable All modern nations engage in active income redistribution and have a system that taxes the wealthy to a greater extent than the poor. Redistributive policies are accompanied by a continuous discussion on the question of how much income inequality is justified (e.g. Pen and Tinbergen, 1977; Sen, 1997). This discussion has an important ide...

The main purpose of this paper wants to investigate the optimal retailer’s lot-sizing policy with two warehouses under partially permissible delay in payments within the economic order quantity (EOQ) framework. In this paper, we want to extend that fully permissible delay in payments to the supplier would offer the retailer partially permissible delay in payments. That is, the retailer must mak...

An order level inventory system for deteriorating items has been developed with demand rate as a ramp type function of time. The finite production rate is proportional to the demand rate and deterioration rate is time proportional. The unit production cost is inversely proportional to the demand rate. The model with no shortage case in inventory is first solved. The inventory shortage is discus...

While deterioration models consider the gradual reduction in quality and quantity of products over time, amelioration models assume the opposite. This paper is based on an earlier work by Hwang for finding an optimal economic order quantity solution for items subject to amelioration in a Weibull distribution. Hwang solved the problem with a graphical procedure. In this paper, a rigorous analyti...

Acquiring L2 vowel quantity can be difficult for native speakers of languages like English where vowel duration cues stress. This study tested whether English learners of Czech would categorize short and long vowels in a stressed or in an unstressed syllable differently than native listeners. The role of L2 experience was also explored. Results showed that the native and nonnative listeners did...

In the classic economic order quantity model the purchasing cost of an order should be paid at the time of its receipt. Sometimes, retailers ask purchasers to pay all or a fraction of the purchasing cost in advance and sometimes allow them to divide the prepayment into several equal-sized parts. In this paper, economic order quantity model for a deteriorating product with and without shortage u...