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During its 25 year history System Dynamics has frequently attracted criticism. This paper argues that, in part, this is explicable in terms of certain characteristics of the approach adopted by most workers in the field. The major features of this approach are reviewed and assessed from a general perspective. Those aspects of the method that are related to model construction and use are then examined in more detail and certain suggestions are made as to how its utility might be Air Jordan 11 enhanced with the aid of techniques developed in other fields. The paper concludes with a brief examination of those areas in which increased application of System Dynamics ideas is envisaged.
Many applications seek to identify features like ‘handles’ and ‘tunnels’ in a shape bordered by a surface, embedded in three dimensions. To this end, we define handle and tunnel loops on surfaces which can help identify these features. We show that a closed surface of genus gg always has gg handle and gg tunnel loops induced by the embedding. Jordan Shoes Canada Price For a class of shapes Cheap Jordans China that retract to graphs, we characterize these loops by a linking condition with these graphs. These characterizations lead to algorithms for detection and generation of these loops. We provide an implementation with applications to feature detection and topology simplification to show the effectiveness of the method.