A software vendor sometimes contracts the maintenance of a software product that other software vendors gave up maintaining due to costs etc. In such case, the vendor must estimate costs of maintenance before contracting. However, due to lack of an objective measure, an expert estimates the cost on the basis of his/her experience. We will propose some metrics for estimating maintenance effort. ...

Given the critical nature of gas turbines in most industrial plants, their availability is of prime importance. Associated maintenance costs can also be extremely high and hence, it is a high priority to find ways of reducing maintenance costs and increasing the availability of the gas turbine. Routine preventative maintenance techniques have been used for many years to minimise major problems ...

OBJECTIVE To measure the differences in direct health care costs and resource utilization among female enrollees in a health maintenance organization who were aged 45 through 65 years and had either osteoporosis or an osteoporosis-related fracture. METHODS One year of medical and pharmacy claims (October 1, 1998, to September 30, 1999) from a mixed-model health plan located in the Midwest wer...

PT BBI is a company engaged in producing machinery, industrial equipment, and foundry. has overgrown as that focuses on manufacturing delivering products such oil gas/refinery/petrochemical industries, power plans, iron castings, precision machinery centers, etc. uses various kinds of machines to support its production process. Some devices have often experienced damage caused downtime recent y...

It is well known that complexity affects software development and maintenance costs. In the Open Source context, the sharing of development and maintenance effort among developers is a fundamental tenet, which can be thought as a driver to reduce the impact of complexity on maintenance costs. However, complexity is a structural property of code, which is not quantitatively accounted for in trad...

this study tries to codify a proper mathematical model which can be predict the costs of repair and maintaining the tractors as precisely as possible for three common models of tractors in shahid beheshti cultivation firm in andimeshk-ahvaz road of dezfoul. studied tractors include: newhland tm155 tractor which is chosen from the most perfect file of 10 tractor machines and jandier tractor-3140...

This paper studies a multiple-recipe predictive maintenance problem with M/G/1 queueing e ects. The server degrades according to a discrete-time Markov chain and we assume that the controller knows both the machine status and the current number of jobs in the system. The controller's objective is to minimize total discounted costs or long-run average costs which include preventative and correct...

The design of transport paths in consuming entities that use routes to access food should be under strong selective pressures to reduce costs and increase benefits. We studied the adaptive nature of branching angles in foraging trail networks of the two most abundant tropical leaf-cutting ant species. We mathematically assessed how these angles should reflect the relative weight of the pressure...

introduction: in health care services, preventing problems and failures is more efficient than concentrating on correcting them. repairs are always expensive, as they require highly specialized personnel and costly spare parts. regular inspecting and servicing, using manual services and checklists, would maximize the impact of maintenance and minimize the costs. it is thus important to introduc...

The paper deals with possibilities of maintenance optimisation of k-out-of-n systems. The first part of the paper briefly analyses influence of preventive maintenance concept on reliability of k-out-of-n system and presents possibilities of preventive maintenance optimisation with respect to maintenance costs. The second part of the paper presents a suggested method of maintenance optimisation ...