In this paper we present a new variant of the classical Vehicle Routing Problem – the Fleet Size and Mix Vehicle Routing Problem with Backhauls (FSMVRPB). An ILP formulation of the FSMVRPB is presented. Optimal solutions for small size instances are produced and upper and lower bounds are generated for larger ones. In this paper we also propose a Set Partitioning Problem (SPP) based heuristic. ...

This paper builds on prior work examining pedagogical strategies for the teaching of OR/MS. In particular, the authors focus on the use of framing as a pedagogical metaframework and extend the repertoire of frames in use presented elsewhere. The purpose of framing and reframing is to improve the understanding of problems and problematic situations by providing a means of developing and synthesi...

PURPOSE To find outlier centers in different aspects of quality of care by comparing two different outcomes and adjusting to case mix in benign prostatic hypertrophy (BPH) patients undergoing prostatectomy. MATERIALS AND METHODS An observational study including 537 consecutive patients undergoing prostatectomy for BPH in three medical centers in Israel between 1991 and 1992. Data were collect...

In this paper a new algorithm has been designed to remove the problem of over-enhancement found in Mix CLAHE especially for underwater images. The underwater image suffers from low contrast and resolution due to dispossessed visibility circumstances, hence an object identification become typical task. The processing of underwater image captured is necessary because the quality of underwater ima...

At the heart of the practice of primary care is the concept of a physician panel. A panel refers to the set of patients whose long term, holistic care the physician is responsible for. A physician’s appointment burden is determined by the size and composition of the panel. Size refers to the number of patients in the panel while composition refers to the case-mix, or the type of patients (older...

At the heart of the practice of primary care is the concept of a physician panel. A panel refers to the set of patients for whose long term, holistic care the physician is responsible. A physician's appointment burden is determined by the size and composition of the panel. Size refers to the number of patients in the panel while composition refers to the case-mix, or the type of patients (older...

The adoption by Medicare in 1983 of prospective payment using diagnosis-related groups (DRGs) has stimulated research to develop case-mix grouping schemes that more accurately predict resource consumption by patients. In this article, the authors explore a new method designed to improve case-mix classification for newborns through the use of birth weight in combination with DRGs to adjust the u...

We describe a MIX cascade protocol and a reputation system that together increase the reliability of a network of MIX cascades. In our protocol, MIX nodes periodically generate a communally random seed that, along with their reputations, determines cascade configuration. Nodes send test messages to monitor their cascades. Senders can also demonstrate message decryptions to convince honest casca...

BACKGROUND The medical care of patients with acute stroke varies considerably between countries. This could lead to measurable differences in mortality and functional outcome. OBJECTIVE To compare case mix, clinical management, and functional outcome in stroke between 11 countries. METHODS All 1484 patients from 11 countries who were enrolled into the tinzaparin in acute ischaemic stroke tr...