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An assembly sequence planner is a system which, given a description of an assembly to be manufactured, identiies subassemblies and generates high-level plans for the construction of the each subassembly, including the nal assembly. Previous research has shown that feasible plans can be eeciently produced for large assemblies, but the generation of good(More)
Welter ancl Periannan Chandrasekaran Department of Computer Science Texas A&M University Pure geometric modeling systems are effective as drafting tools, but of limited utility in conceptual design. A design system which explicitly represents functional requirements and ties this to a geometric model could more effectively support the design process and(More)
Let S be a set of points in IR d , each with a weight that is not known precisely, only known to fall within some range. What is the locus of the centroid of S? We prove that this locus is a convex polytope, the projection of a zonotope in IR d+1. We derive complexity bounds and algorithms for the construction of these \centroid polytopes".
The role of serial NT-proBNP measurements in patients suffering from chronic systolic heart failure (CHF) who already receive individually optimized pharmacotherapy is still unresolved. NT-proBNP was assessed at baseline and at 6 months follow-up in 504 stable CHF patients treated with individually optimized pharmacotherapy. After assessment of clinical(More)
The aim of the study is to evaluate the use of beta-blockers in chronic heart failure (CHF) and the extent of heart rate reduction achieved in clinical practice and to determine differences in outcome of patients who fulfilled select inclusion criteria of the SHIFT study according to resting heart rate modulated by beta-blocker therapy. We evaluated an(More)
BACKGROUND The average diagnostic sensitivity of exercise stress tests (ESTs) is lower than that of other non-invasive cardiac stress tests. The aim of the study was to examine whether high-sensitivity cardiac troponin T (hs-cTnT) or copeptin concentrations rise in response to inducible myocardial ischaemia and may improve the diagnostic accuracy of ESTs.(More)
To investigate determinants and temporal developments of treatment strategies, 5-year survival and heart transplantation rates between patients treated at secondary and tertiary hospitals. Baseline characteristics, treatment and follow-up data from 2,023 patients with chronic systolic heart failure due to ischaemic or dilated cardiomyopathy enrolled between(More)
This paper describes and analy es the most commonly used form of constraint languages for assembly planning: mating constraint languages. These constraints are typically composed of relations asserting that a certain pair of parts must be mated before some other pair of parts may be mated. However there are many significant differences between the forms of(More)