Verification of Item Usage Rules in Product Configuration

In the development of complex products product configuration systems are often used to support the development process. Item Usage Rules (IURs) are conditions for including specific items in products bills of materials based on a high-level product description. Large number of items and significant complexity of IURs make it difficult to maintain and analyze IURs manually. In this paper we present an automated approach for verifying IURs, which guarantees the presence of exactly one item from a predefined set in each product, as well as that an IUR can be reformulated without changing the set of products for which the item was included

Betaalbaarheid zuivering lozingswater glastuinbouw. Addendum bij LEI-rapport 2013-044

Zuivering van lozingswater (afvalwater) is betaalbaar voor 30-35% van de glastuinbouwbedrijven met substraatteelt (potgrond, steenwol). Deze bedrijven exploiteren 40-50% van het gehele areaal glastuinbouw met substraatteelt. Bij de beoordeling van de betaalbaarheid zijn de extra jaarkosten uitgedrukt als percentage van het bedrijfssaldo en van het inkomen uit bedrijf. Daarnaast is gekeken of de benodigde investeringen kunnen worden gefinancierd uit de vrije investeringsruimte

The Fold-in, Fold-out Design for DCE Choice Tasks: Application to Burden of Disease

Background. In discrete-choice experiments (DCEs), choice alternatives are described by attributes. The importance of each attribute can be quantified by analyzing respondents’ choices. Estimates are valid only if alternatives are defined comprehensively, but choice tasks can become too difficult for respondents if too many attributes are included. Several solutions for this dilemma have been proposed, but these have practical or theoretical drawbacks and cannot be applied in all settings. The objective of the current article is to demonstrate an alternative solution, the fold-in, fold-out approach (FiFo). We use a motivating example, the ABC Index for burden of disease in chronic obstructive pulmonary disease (COPD). Methods. Under FiFo, all attributes are part of all choice sets, but they are grouped into domains. These are either folded in (all attributes have the same level) or folded out (levels may differ). FiFo was applied to the valuation of the ABC Index, which included 15 attributes. The data were analyzed in Bayesian mixed logit regression, with additional parameters to account for increased complexity in folded-out questionnaires and potential differences in weight due to the folding status of dom

Modernisering personenvennootschappen: Rapport van de Werkgroep Personenvennootschappen

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