Burkhard Alpers

Concepts and application of policy-based management

Due to downsising, deregulation and tremendous growth, computing and telecommunications systems have become heterogeneous and complex environments with multiple players involved. For managing such systems more powerful methods than those used for network element management are needed. It must be possible to structure and partition management according to responsibilities, to provide managers with higher-level abstractions and to enable them to flexibly adapt the way of management to their specific needs. To fulfil these requirements, we introduce domain-based management policies. Policies allow the specification of management intention on different levels of abstraction. We discuss policy classification, formalisation and hierarchies. Then we present an architecture for policy enforcement services Finally, we outline two application scenarios in the areas of distributed systems and telecommunication.

The Mathematical Expertise of Mechanical Engineers – The Case of Mechanism Design

In this contribution we present the results of a project that investigates the mathematical qualifications a mechanical engineer needs for working on practical tasks in his daily life. In particular, we report on the results concerning a mechanism design task where certain machine parts have to be moved in order to realize a cutting activity.

On mappings preserving orthogonality of non-singular vectors

AbstractLetq be a regular quadratic form on a vector space (V,F) and letf be the bilinear form associated withq. Then,

Zum Transitivitätsverhalten metrischer Kollineationsgruppen

\dot V: = \{ z \in V|q(z) \ne 0\}

DOMAINS: concepts for networked systems management and their realization

is the set of non-singular vectors ofV, and forx, y ∈

On Angles and The Fundamental Theorems of Metric Geometry

\dot V