Buchbesprechungen

Ohne Zusammenfassung     

Soft eigenvalue assignment with limited disturbance feedforward and state controller norm

The method of softly assigning eigenvalues is attractive for design problems where constraining the control effort and disturbance feedforward is more important than following the exact pole location.     

Automatisierung

Ohne Zusammenfassung     

Gain-scheduled H∞ controller with minimum Frobenius norm

For microcontroller implementations, H_∞ controllers with small numbers in their state-space realization are intended. Hence, minimum Frobenius norm is a design target. As an alternative, and useful for predetermining H_∞ gain schedules, the infinity norm is included with the help of ramifications points of the eigenvalue contour of the Hamiltonian matrix.     

T.I.S.P. — das europäische Qualifikationszertifikat für Informationssicherheit

Spezialisten für IT-Sciherheit sind auf dem Arbeitsmarkt gefragt. Aber für potentielle Arbeitgeber ist es mitunter nicht einfach, die Qualifikation der Bewerber realistisch einzusch?tzen, genau wie es für den Bewerber nicht immer leicht ist, seine Qualifikation nach au?en glaubhaft deutlich zu machen. Expertenzertifikate k?nnen das Problem mindern. Mit diesem Anspruch wurde vor knapp drei Jahren von TeleTrusT Deutschland e.V. das T.I.S.P.-Zertifikat entwickelt — mit Erfolg: über 130 Experten haben es seitdem erworben.     

Optimierung bei Reglerentwurf und neuronalem Lernen

Simularities between matrix assignment in designing observer-free output controllers and the training phase in backpropagation algorithm are addressed. Learning processes in artificial neural networks with and without supervisor are emphasized regarding complex optimization, and demonstrated with an illustrative example of automatically stabilizing an unstable process.     

Ray tracing with PO/PTD for RCS modeling of large complex objects

The present paper deals with a new efficient approach in order to assess the simulation of scattered fields from arbitrary metallic objects. The basic idea is to combine a ray tracing algorithm with the principles of physical optics (PO) and the physical theory of diffraction (PTD). The ray tracing algorithm stochastically launches discrete rays and uses a ray density normalization. In order to perform simulations at finite objects the PO/PTD formulation is required. Thus, fast intersection routines can be implemented, while the ray density formulation reduces the PO and PTD integrals to a pure sum of ray contributions. Simulation results obtained with this model are verified by comparison with both exact simulations using a method of moments (MoM) code and measurement results, proving an excellent accuracy and fast computation even at complex objects. With this asymptotic approach, scattering properties of large objects that are too complex for exact methods can be analyzed with rather moderate computation efforts. Typical applications include the simulation of low observability (LO) designs as well as the generation of databases for identifying unknown aircraft by their radar signature.