DYLP is a full implementation of the dynamic simplex algorithm for linear programming. Dynamic simplex attempts to maintain a reduced active constraint system by regularly purging loose constraints and variables with unfavourable reduced costs, and adding violated constraints and variables with favourable reduced costs. In abstract, the code alternates between primal and dual simplex algorithms...

Many decision problems can be formulated as the problem of minimising a convex cost function that also depends on an uncertain variable. In this seminar, we take a databased approach to deal with uncertainty. We will focus mainly on a worst-case approach, where we minimise the maximum of the cost functions corresponding to some previously observed instances of the uncertain variable. We call th...

We estimated the cost and cost-effectiveness of a clinical pharmacist intervention known to improve the appropriateness of drug prescribing. Elderly veteran outpatients prescribed at least five drugs were randomized to an intervention (105 patients) or control (103) group and followed for 1 year. The intervention pharmacist provided advice to patients and their physicians during all general med...

OBJECTIVES To quantify the potential reduction in hospital costs from adoption of best local practices in supply chain management and discharge planning. STUDY DESIGN We performed multivariate statistical analyses of the association between total variable cost per procedure and medical device price and length of stay, controlling for patient and hospital characteristics. METHODS Ten hospita...

An innovative methodology to contract capacity employs an index designed to allow comparison among the expected generation costs of electricity from different types of fuel sources. An analysis shows, however, that the methodology presents distortions that favor the competitiveness of power plants with higher variable costs, and also that it is subject to endogenous choices of the auctioneer, w...

conclusions accidents resulting in death, total disability, and partial disability impose a huge cost burden on society, whereas the employer will bear a relatively low cost. this is because of society’s health, treatment, and welfare systems available for treatment and rehabilitation of injured employees and their families. background occupational accidents represent one of the major problems ...

The results of this project have lead to several improvements in the costeffectiveness of diet formulations and feeding schedules for channel catfish. Advancements in these areas will significantly improve production economics by reducing diet costs and increasing the eff iciency of feed utilization. The benefits obtained from these advancements will be substantial because over one-half of the ...

This paper describes a tabu search heuristic for a vehicle routing problem where the owner of a private fleet can either visit a customer with one of his vehicles or assign the customer to a common carrier. The owner's objective is to minimize the variable and fixed costs for operating his fleet plus the total costs charged by the common carrier. The proposed tabu search is shown to outperform ...

Fixed cost: Includes all costs that do not vary with activity for an accounting period. Fixed costs are, at any time, the inevitable costs that must be paid regardless of the level of output and of the resources used. A Fixed Cost is therefore not an Opportunity Cost. Overhead is considered a fixed cost, even though it may vary somewhat according to the amount of activity. Any cost that does no...

We construct an indicator variable (HighScore) to aggregate and summarize four recall characteristics that we expect to be associated with higher overall recall costs, including greater loss of reputation and future sales as well as higher expected litigation costs.1 We employ the dichotomous variable, HighScore, because it is easy to interpret and because the relation between the individual re...