منابع مشابه
Combined replacement models
— This paper summarizes ten replacement models which combine tkree basic replacements: (i)age replacement; (ii)block replacement; (in) periodic replacement with minimal repair at failure. The expected cast rates ofeach model are derived, using the usual caktdus method ofprobabitity. As an example, we give an optimum policy to minimize the expected cost rate ofone model
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Abstract In some practical situations, most systems would fail roughly with time by both causes of additive and independent damages. From such viewpoints, this paper considers three combined replacement policies with two kinds of damages: The unit is replaced at a planned time or when the total additive damage exceeds a failure level, whichever occurs first, and undergoes minimal repair when in...
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Resection and reconstruction of the superior vena cava in patients with lung cancer is still considered a surgical challenge; the numerous problems related to patient selection, the choice of the most appropriate surgical strategy and technique, the most suitable material for replacement, and the number of potential complications definitively show an impact on short-term outcome and long-term p...
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Of 300 consecutive patients undergoing primary operation for mitral valve replacement combined with coronary bypass grafting, 22 (7.3%) died in-hospital. Multivariate testing of preoperative and operative descriptors identified radiographic cardiac enlargement, preoperative paced rhythm or atrial fibrillation, 70% or more left main coronary obstruction, and serum bilirubin of more than 2 mg% as...
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Early and late outcome was studied in 630 patients who underwent aortic valve replacement between 1974 and 1982. Group 1 (506 patients) did not have important coronary artery disease, group 2 (69 patients) had coronary artery disease and underwent coronary artery bypass grafting, and group 3 (55 patients) had coronary artery disease but did not undergo myocardial revascularisation. Early mortal...
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ژورنال
عنوان ژورنال: RAIRO - Operations Research
سال: 1983
ISSN: 0399-0559,1290-3868
DOI: 10.1051/ro/1983170201931