This paper presents a smartphone-based physical access control system in which the access points are not directly connected to a central authorization server, but rather use the connectivity of the mobile phone to authorize a user access request online by a central access server.

In computer science curricula the two areas programming and software engineering are usually separated. In programming students learn an object oriented language and then deepen their knowledge in other languages, algorithms and data structures. On the other hand software engineering starts with discussing processes and then addresses topics like requirements engineering, software design and software architectures.

We describe a new algorithm for computing asymptotic expansions for a large class of expressions, whereby the asymptotic series are of a form more complicated than mere Puiseux series.Today's computer algebra systems still lack good algorithms for handling such asymptotic expansions, although in theory some algorithms have been presented.The algorithm we present in this article is directly induced by the limit computation algorithm presented in [2] which is based on series computations in terms of the most rapidly varying subexpression of a given expression.Examples of the algorithm implemented in Maple are shown.