Abstract. The recent increasing interplay between actuarial and financial mathematics has led to a surge of risk theoretic modeling. Especially actuarial ruin models under fairly general conditions on the underlying risk process have become a focus of attention. Motivated by applications to the modeling of operational risk losses in financial risk management, we investigate the stability of cla...

This paper introduces the fleet size and mix pollution-routing problem which extends the pollution-routing problem by considering a heterogeneous vehicle fleet. The main objective is to minimize the sum of vehicle fixed costs and routing cost, where the latter can be defined with respect to the cost of fuel and CO2 emissions, and driver cost. Solving this problem poses several methodological ch...

Deregulation ha~ opened up many opportunities and challenges in the transportation industry opportunities to increase profits and challenges to keep from being outflanked by competition. A goal of particular interest to the scheduled airlines is to set prices more adaptively and to ~hange them more rapidly. A difficult problem arises when many passengers with different itineraries compete for a...

Feed is one of the factors which play an important role in determining a successful development of an aquaculture industry. It is always critical to produce the best aquaculture diet at a minimum cost in order to trim down the operational cost and gain more profit. However, the feed mix problem becomes increasingly difficult since many issues need to be considered simultaneously. Thus, the purp...

OBJECTIVE To assess the validity of case mix adjustment methods used to derive standardised mortality ratios for hospitals, by examining the consistency of relations between risk factors and mortality across hospitals. DESIGN Retrospective analysis of routinely collected hospital data comparing observed deaths with deaths predicted by the Dr Foster Unit case mix method. SETTING Four acute N...

One of the most difficult problems in health care policy is adjusting payment to activity. Particularly little is known about how resources are allocated to departments of geriatric care. To investigate whether departments of geriatric medicine in Stockholm, Sweden relate their costs to case-mix, one of the most well-known case-mix systems for geriatric care, the Resource Utilization Groups, ve...

We investigated the relationship between a number of patient and management variables and mortality after surgery for fracture of the hip. Data relating to 18,817 patients were obtained from the Scottish Hip Fracture Audit database. We divided variables into two categories, depending on whether they were case-mix (age; gender; fracture type; pre-fracture residence; pre-fracture mobility and ASA...

The adoption of EMR systems has been argued to lead to physicians “upcoding” their patients to inflate insurance reimbursements. In this paper, we examine if the adoption of the Clinical Physician Order Entry (CPOE) system is associated with an increase in the complexity of the patients' case mix that hospitals report (termed "upcoding"). We make use of a staggered roll-out of the Recovery Audi...

Freight transport optimization, long based solely on an economic approach, happen today through the integration of environmental and/or social concerns, in line with the objectives of sustainable development. In the case of Small and Very Small Enterprises, these objectives cannot be reached individually, and these companies have to join their efforts to find collective solutions. Therefore, th...