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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Multi-Objective Optimization Problems with Random Elements - Survey of Approaches
 Kaňková, Vlasta
Many economic and financial situations depend simultaneously on a random element and a decision parameter. Mostly, it is possible to influence the above mentioned situation only by an optimization model depending on a probability measure. This optimization problem can be static (one-stage), dynamic with finite or infinite horizon, single-objective or multi-objective. We focus on one-stage multi-objective problems corresponding to applications those are suitable to evaluate simultaneously by a few objectives. The aim of the contribution is to give a survey of different approaches (as they are known from the literature) of the above mentioned applications. To this end we start with well-known mean-risk model and continue with other known approaches. Moreover, we try to complete every model by a suitable application. Except an analysis of a choice of the objective functions type we try to discuss suitable constraints set with respect to the problem base, possible investigation and relaxation. At the end we mention properties of the problem in the case when the theoretical „underlying“ probability measure is replaced by its „deterministic“ or „stochastic“ estimate.
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Design Against Brittle of Elastic-Plastic Fracture of Nuclear Waste Container
 Pluvinage, G. ; Lenkey, G. B. ; Dlouhý, Ivo
Design against brittle or elastic plastic fracture of nuclear waste container is discussed based on three different concepts:(i)reserve of ductility defined by means of reference temperature,(ii)deterministic design using linear or elasto-plastic fracture mechanics associated with reserve factors,and (iii)probabilistic design associated with RCC-MR failure assessment diagram. Cast ferritic steel predetermined for containers of spent nuclear fuel has been used in experimental part of the study.Fracture toughness characteristics necessary for considerations have been obtained by standard 1T three point bend specimens tested statically at different temperatures.Pre-cracked Charpy type specimen has been also employed for the investigations tested statically and dynamically.Material properties necessary for the concept presented are corresponding Master Curve and Weibull distribution of fracture toughness.Special attention has been paid to dynamic loading.Large scatter in reserve factor was found depending on the selected failure assessment method for fracture toughness characteristics changing the value from 1.44 to 4.55.
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