Search

Your search keyword '"Hametner C"' showing total 216 results
Start Over Author "Hametner C"
216 results on '"Hametner C"'

6. Efficient real driving emissions calibration of automotive powertrains under operating uncertainties.

Author

Wasserburger, A., Didcock, N., and Hametner, C.

Subjects
DISTRIBUTION (Probability theory), CALIBRATION, AUTOMOBILE power trains
Abstract

The steady-state calibration of automotive powertrains is typically based on the assumption of one specific drive cycle and perfectly controllable operating conditions. During real operation, however, these assumptions are violated, which implies that the calibration might in fact not be optimal. Therefore, in order to achieve reliable performance in a real-world setting, these uncertainties have to have been considered already during the calibration process. In this article, a stochastic optimization approach that takes the mentioned operating uncertainties into account by including probability distributions of the disturbances, is suggested. Furthermore, an approximation is derived of the distribution of the optimization performance criterion that greatly reduces the computational load during optimization compared with Monte Carlo sampling. Simulation results show that the proposed probabilistic approach leads to lower expected values of emissions and consumption when compared with deterministic optimization approaches ignoring the stochastic influences. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

9. EndoVAscular treatment and ThRombolysis for Ischemic Stroke Patients (EVA-TRISP) registry: Basis and methodology of a pan-European prospective ischaemic stroke revascularisation treatment registry

Author

Nordanstig, A. Curtze, S. Gensicke, H. Zinkstok, S.M. Erdur, H. Karlsson, C. Karlsson, J.-E. Martinez-Majander, N. Sibolt, G. Lyrer, P. Traenka, C. Baharoglu, M.I. Scheitz, J.F. Bricout, N. Hénon, H. Leys, D. Eskandari, A. Michel, P. Hametner, C. Ringleb, P.A. Arnold, M. Fischer, U. Sarikaya, H. Seiffge, D.J. Pezzini, A. Zini, A. Padjen, V. Jovanovic, D.R. Luft, A. Wegener, S. Kellert, L. Feil, K. Kägi, G. Rentzos, A. Lappalainen, K. Leker, R.R. Cohen, J.E. Gomori, J. Brehm, A. Liman, J. Psychogios, M. Kastrup, A. Papanagiotou, P. Gralla, J. Magoni, M. Majoie, C.B.L.M. Bohner, G. Vukasinovic, I. Cvetic, V. Weber, J. Kulcsar, Z. Bendszus, M. Möhlenbruch, M. Ntaios, G. Kapsalaki, E. Jood, K. Nolte, C.H. Nederkoorn, P.J.J. Engelter, S. Strbian, D. Tatlisumak, T.

Abstract

Purpose The Thrombolysis in Ischemic Stroke Patients (TRISP) collaboration was a concerted effort initiated in 2010 with the purpose to address relevant research questions about the effectiveness and safety of intravenous thrombolysis (IVT). The collaboration also aims to prospectively collect data on patients undergoing endovascular treatment (EVT) and hence the name of the collaboration was changed from TRISP to EVA-TRISP. The methodology of the former TRISP registry for patients treated with IVT has already been published. This paper focuses on describing the EVT part of the registry. Participants All centres committed to collecting predefined variables on consecutive patients prospectively. We aim for accuracy and completeness of the data and to adapt local databases to investigate novel research questions. Herein, we introduce the methodology of a recently constructed academic investigator-initiated open collaboration EVT registry built as an extension of an existing IVT registry in patients with acute ischaemic stroke (AIS). Findings to date Currently, the EVA-TRISP network includes 20 stroke centres with considerable expertise in EVT and maintenance of high-quality hospital-based registries. Following several successful randomised controlled trials (RCTs), many important clinical questions remain unanswered in the (EVT) field and some of them will unlikely be investigated in future RCTs. Prospective registries with high-quality data on EVT-treated patients may help answering some of these unanswered issues, especially on safety and efficacy of EVT in specific patient subgroups. Future plans This collaborative effort aims at addressing clinically important questions on safety and efficacy of EVT in conditions not covered by RCTs. The TRISP registry generated substantial novel data supporting stroke physicians in their daily decision making considering IVT candidate patients. While providing observational data on EVT in daily clinical practice, our future findings may likewise be hypothesis generating for future research as well as for quality improvement (on EVT). The collaboration welcomes participation of further centres willing to fulfill the commitment and the outlined requirements. © 2021 BMJ Publishing Group. All rights reserved.

Published
2021

20. Risk-averse real driving emissions optimization considering stochastic influences.

Author

Wasserburger, A., Hametner, C., and Didcock, N.

Subjects
*RISK aversion, *PROCESS optimization, *ENERGY consumption
Abstract

Optimization of vehicle powertrains is usually based on specific drive cycles and is performed on testbeds under reproducible conditions. However, in real-world operation, energy consumption and emissions differ significantly from the values obtained in testbed environments, which also implies breaching legislative thresholds. Therefore, in order to close the gap between testbed and real world, it is necessary to take random effects, like varying road and ambient conditions or various traffic situations, into account during the engine calibration process. In this article a stochastic optimization approach based on risk measures, that quantify the prevalent uncertainties, is presented. Rather than optimizing a deterministic value for one specific scenario described by a drive cycle, the distribution of possible outcomes is shaped in a way that it reflects the risk aversion and preferences of the decision maker. Simulation results show that incorporating randomness in the optimization process yields substantially more robust and reliable results. [ABSTRACT FROM AUTHOR]

Published
2020
Full Text
View/download PDF

32. Assessment of the microbial growth support potential of products in contact with drinking water (CPDW):Development of a harmonised test to be used in the European Acceptance Scheme concerning CPDW

Author

van der Kooij, D., Albrechtsen, Hans-Jørgen, Corfitzen, Charlotte B., Ashworth, J., Parry, I., Enkiri, F., Hambsch, B., Hametner, C., Kloiber, R., Veenendaal, H.R., Verhamme, D., Hoekstgra, E.J., van der Kooij, D., Albrechtsen, Hans-Jørgen, Corfitzen, Charlotte B., Ashworth, J., Parry, I., Enkiri, F., Hambsch, B., Hametner, C., Kloiber, R., Veenendaal, H.R., Verhamme, D., and Hoekstgra, E.J.

Published
2003

Catalog

Books, media, physical & digital resources
See catalog results