In this paper, we studied single-server models of queuing-inventory systems (QIS) with catastrophes in the warehouse part and negative customers (n-customers) service facility. Consumer (c-customers) that arrived to buy inventory can be queued an infinite buffer. Under catastrophes, all system is destroyed but (on server or buffer) are still waiting for replenishment stocks. Upon arrival n-cust...

BACKGROUND Since the implementation of the 2002 Tobacco Advertising and Promotion Act, point-of-sale (PoS) tobacco displays are one of few remaining means of communication between the tobacco industry and customers in the UK. This study aimed to explore the characteristics of tobacco displays in a UK city, and particularly to assess the tobacco prices and promotional offers, types and pack size...

We refer to the sale of goods and services to end consumers (i.e. a mass of clients with small quantity requirements) aq retail markets. These normally include private clients, households and small businesses. Therefore, the cost of transactions in retail markets tends to be rather high compared to those encountered with instltutionalclients. Bullding upon thepotentiel that electronic ' markets...

conclusions the findings of this study indicated that the economic burden of tbis was high in fatal accidents in fars province so that it was equivalent to 0.00011% of iran’s gross domestic product (gdp) in 2013. therefore, more attention has to be paid to the rules to prevent the fatal accidents. results deaths resulting from tbis due to traffic accidents in shiraz imposed 6.2 billion rials (5...

Although the lost profit from lost business is quite difficult to estimate for the queuing systems with cyclic demands, this paper presents a creative and effective approach to formulate waiting cost including balking loss and reneging loss. The balking probability is defined as the balking index θ1 multiplying by the expected queue length Lq and the reneging probability is defined as the reneg...

the decisions made in the planning phase of a building project greatly affect its future operation and maintenance (o&m;) cost. recognizing the o&m; cost of condominiums’ common facilities as a critical issue for home owners, this research aims to develop an artificial neural network (ann) o&m; cost prediction model to assist developers and architects in effectively assessing the impacts of the...

the reliable operation of spillways, in emergency as well as normal conditions, is one of the vital components in dam safety. free or uncontrolled overflow spillways are the most reliable choice however. they usually impose higher construction cost and /or results in wasting a considerable amount of water or live capacity of the reservoirs. employing fuse gates might be a way of reconciling dam...

Conditional Value-at-Risk Constrained Optimization of a Power Portfolio Published in International Journal of Applied Decision Sciences • A predictive and risk analytics tool guiding cash management of warranty reserves, covering contingent liabilities. • Finding a balance between excess reserves causing opportunity cost, and not enough reserves necessitating emergency funds. • The decision mak...

The cost of alcohol abuse in California in 2001 totaled $17.8 billion for health service, substance abuse treatment/prevention, lost productivity from premature deaths, and justice system costs (See Appendix Table 11). Nearly 84,000 hospital discharges resulted from alcohol abuse, including 11,388 discharges with alcohol dependence syndrome, 9,314 with alcoholic psychoses, and 8,115 with cirr...

We study a single-product single-location inventory system under periodic review, where excess demand is lost and the replenishment lead time is positive. The performance measure of interest is the long run average holding cost and lost sales penalty. For a large class of demand distributions, we show that when the lost sales penalty becomes large compared to the holding cost, the relative diff...