TY  - THES
A1  - Dahmen-Beumers, Judith
T1  - Eine exemplarische Untersuchung zur Regionalität in der Kunst : der Aachener Bildhauer und Maler Benno Werth (*1929)
KW  - Kunstmarkt
KW  - Geschichte
KW  - Aachen
Y1  - 2005
SN  - 3-8334-3014-1
SN  - 9783833430145
PB  - Books on Demand
CY  - Norderstedt
ER  - 
TY  - JOUR
A1  - Dachwald, Bernd
T1  - Optimization of very-low-thrust trajectories using evolutionary neurocontrol
JF  - Acta Astronautica
N2  - Searching optimal interplanetary trajectories for low-thrust spacecraft is usually a difficult and time-consuming task that involves much experience and expert knowledge in astrodynamics and optimal control theory. This is because the convergence behavior of traditional local optimizers, which are based on numerical optimal control methods, depends on an adequate initial guess, which is often hard to find, especially for very-low-thrust trajectories that necessitate many revolutions around the sun. The obtained solutions are typically close to the initial guess that is rarely close to the (unknown) global optimum. Within this paper, trajectory optimization problems are attacked from the perspective of artificial intelligence and machine learning. Inspired by natural archetypes, a smart global method for low-thrust trajectory optimization is proposed that fuses artificial neural networks and evolutionary algorithms into so-called evolutionary neurocontrollers. This novel method runs without an initial guess and does not require the attendance of an expert in astrodynamics and optimal control theory. This paper details how evolutionary neurocontrol works and how it could be implemented. The performance of the method is assessed for three different interplanetary missions with a thrust to mass ratio <0.15mN/kg (solar sail and nuclear electric).
Y1  - 2005
SN  - 1879-2030
VL  - 57
IS  - 2-8
SP  - 175
EP  - 185
PB  - Elsevier
CY  - Amsterdam [u.a.]
ER  - 
TY  - JOUR
A1  - Groß, Rolf Fritz
A1  - Berger, J.
T1  - Quo Vadis - Ausblick in die Gebäudeleittechnik der Zukunft
T1  - Whitherfacility management? An outlook to the future
JF  - HLH. Heizung, Lüftung/Klima, Haustechnik
N2  - Auf dem Weg zum vernetzten Haus stoßen Hersteller und Planer, insbesondere im privaten Wohnungsbau, zur Zeit noch auf erhebliche Widerstände bei der Durchdringung des Marktes.
N2  - Producers and planners of facility management systems are still faced with building owners' reluctance, especially when it comes to private homes.
Y1  - 2005
SN  - 1436-5103
VL  - 56
IS  - 1
SP  - 39
EP  - 41
PB  - Springer
CY  - Düsseldorf
ER  -