---
_id: '64806'
author:
- first_name: Rolf
full_name: Biehler, Rolf
id: '16274'
last_name: Biehler
- first_name: T.
full_name: Kawakami, T.
last_name: Kawakami
- first_name: E.
full_name: Lampen, E.
last_name: Lampen
- first_name: T.
full_name: Weiland, T.
last_name: Weiland
- first_name: L.
full_name: Zapata-Cardona, L.
last_name: Zapata-Cardona
citation:
ama: 'Biehler R, Kawakami T, Lampen E, Weiland T, Zapata-Cardona L. Statistics and
data science education as a vehicle for empowering citizens – short summary of
a survey. In: Beswick K, Kaur B, Makar K, Ochoviet C, Venkat H, eds. Proceedings
of the 15th International Congress on Mathematical Education. Vol 1. MERGA;
2025:198-203.'
apa: Biehler, R., Kawakami, T., Lampen, E., Weiland, T., & Zapata-Cardona, L.
(2025). Statistics and data science education as a vehicle for empowering citizens
– short summary of a survey. In K. Beswick, B. Kaur, K. Makar, C. Ochoviet, &
H. Venkat (Eds.), Proceedings of the 15th International Congress on Mathematical
Education (Vol. 1, pp. 198–203). MERGA.
bibtex: '@inbook{Biehler_Kawakami_Lampen_Weiland_Zapata-Cardona_2025, title={Statistics
and data science education as a vehicle for empowering citizens – short summary
of a survey}, volume={1}, booktitle={Proceedings of the 15th International Congress
on Mathematical Education}, publisher={MERGA}, author={Biehler, Rolf and Kawakami,
T. and Lampen, E. and Weiland, T. and Zapata-Cardona, L.}, editor={Beswick, K.
and Kaur, B. and Makar, K. and Ochoviet, C. and Venkat, H.}, year={2025}, pages={198–203}
}'
chicago: Biehler, Rolf, T. Kawakami, E. Lampen, T. Weiland, and L. Zapata-Cardona.
“Statistics and Data Science Education as a Vehicle for Empowering Citizens –
Short Summary of a Survey.” In Proceedings of the 15th International Congress
on Mathematical Education, edited by K. Beswick, B. Kaur, K. Makar, C. Ochoviet,
and H. Venkat, 1:198–203. MERGA, 2025.
ieee: R. Biehler, T. Kawakami, E. Lampen, T. Weiland, and L. Zapata-Cardona, “Statistics
and data science education as a vehicle for empowering citizens – short summary
of a survey,” in Proceedings of the 15th International Congress on Mathematical
Education, vol. 1, K. Beswick, B. Kaur, K. Makar, C. Ochoviet, and H. Venkat,
Eds. MERGA, 2025, pp. 198–203.
mla: Biehler, Rolf, et al. “Statistics and Data Science Education as a Vehicle for
Empowering Citizens – Short Summary of a Survey.” Proceedings of the 15th International
Congress on Mathematical Education, edited by K. Beswick et al., vol. 1, MERGA,
2025, pp. 198–203.
short: 'R. Biehler, T. Kawakami, E. Lampen, T. Weiland, L. Zapata-Cardona, in: K.
Beswick, B. Kaur, K. Makar, C. Ochoviet, H. Venkat (Eds.), Proceedings of the
15th International Congress on Mathematical Education, MERGA, 2025, pp. 198–203.'
date_created: 2026-03-02T12:18:38Z
date_updated: 2026-07-09T11:23:23Z
department:
- _id: '363'
editor:
- first_name: K.
full_name: Beswick, K.
last_name: Beswick
- first_name: B.
full_name: Kaur, B.
last_name: Kaur
- first_name: K.
full_name: Makar, K.
last_name: Makar
- first_name: C.
full_name: Ochoviet, C.
last_name: Ochoviet
- first_name: H.
full_name: Venkat, H.
last_name: Venkat
intvolume: ' 1'
language:
- iso: eng
page: 198-203
publication: Proceedings of the 15th International Congress on Mathematical Education
publication_status: published
publisher: MERGA
status: public
title: Statistics and data science education as a vehicle for empowering citizens
– short summary of a survey
type: book_chapter
user_id: '37888'
volume: 1
year: '2025'
...
---
_id: '58861'
author:
- first_name: Lars
full_name: Luchterhandt, Lars
id: '74648'
last_name: Luchterhandt
- first_name: Vivek
full_name: Govindasamy, Vivek
last_name: Govindasamy
- first_name: Yutong
full_name: Wang, Yutong
last_name: Wang
- first_name: Rainer
full_name: Dömer, Rainer
last_name: Dömer
- first_name: Wolfgang
full_name: Müller, Wolfgang
id: '16243'
last_name: Müller
- first_name: J. Christoph
full_name: Scheytt, J. Christoph
id: '37144'
last_name: Scheytt
orcid: '0000-0002-5950-6618 '
citation:
ama: 'Luchterhandt L, Govindasamy V, Wang Y, Dömer R, Müller W, Scheytt JC. Case
Study on Combining Open-Source Tool Flows for Grids of Processing Cells. In: OSSMPIC
- Open Source Solutions for Massively Parallel Integrated Circuits. ; 2025.'
apa: Luchterhandt, L., Govindasamy, V., Wang, Y., Dömer, R., Müller, W., & Scheytt,
J. C. (2025). Case Study on Combining Open-Source Tool Flows for Grids of Processing
Cells. OSSMPIC - Open Source Solutions for Massively Parallel Integrated Circuits.
bibtex: '@inproceedings{Luchterhandt_Govindasamy_Wang_Dömer_Müller_Scheytt_2025,
place={Lyon, France}, title={Case Study on Combining Open-Source Tool Flows for
Grids of Processing Cells}, booktitle={OSSMPIC - Open Source Solutions for Massively
Parallel Integrated Circuits}, author={Luchterhandt, Lars and Govindasamy, Vivek
and Wang, Yutong and Dömer, Rainer and Müller, Wolfgang and Scheytt, J. Christoph},
year={2025} }'
chicago: Luchterhandt, Lars, Vivek Govindasamy, Yutong Wang, Rainer Dömer, Wolfgang
Müller, and J. Christoph Scheytt. “Case Study on Combining Open-Source Tool Flows
for Grids of Processing Cells.” In OSSMPIC - Open Source Solutions for Massively
Parallel Integrated Circuits. Lyon, France, 2025.
ieee: L. Luchterhandt, V. Govindasamy, Y. Wang, R. Dömer, W. Müller, and J. C. Scheytt,
“Case Study on Combining Open-Source Tool Flows for Grids of Processing Cells,”
2025.
mla: Luchterhandt, Lars, et al. “Case Study on Combining Open-Source Tool Flows
for Grids of Processing Cells.” OSSMPIC - Open Source Solutions for Massively
Parallel Integrated Circuits, 2025.
short: 'L. Luchterhandt, V. Govindasamy, Y. Wang, R. Dömer, W. Müller, J.C. Scheytt,
in: OSSMPIC - Open Source Solutions for Massively Parallel Integrated Circuits,
Lyon, France, 2025.'
date_created: 2025-02-26T14:40:23Z
date_updated: 2026-07-16T14:58:16Z
department:
- _id: '58'
language:
- iso: eng
place: Lyon, France
project:
- _id: '52'
name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing'
publication: OSSMPIC - Open Source Solutions for Massively Parallel Integrated Circuits
status: public
title: Case Study on Combining Open-Source Tool Flows for Grids of Processing Cells
type: conference
user_id: '16243'
year: '2025'
...
---
_id: '62262'
abstract:
- lang: eng
text: We construct the first examples of chamber-regular lattices on C̃₂-buildings.
Assuming a conjecture of Kantor our list of examples becomes a classification
for chamber-regular C̃₂-lattices on locally-finite C̃₂-buildings. The links of
special vertices in the buildings we construct, are all isomorphic to (the incidence
graph of) the unique generalized quadrangle Q of order (3,5). In particular our
constructions involve chamber-regular actions on Q. These actions on Q are the
first (and if Kantor's conjecture holds the only) chamber-regular actions on a
finite generalized quadrangle and therefore interesting in their own right. Moreover
Q is not Moufang and therefore none of our examples is a Bruhat-Tits building
and all our lattices are exotic building lattices.
author:
- first_name: Franziska
full_name: Stamer, Franziska
id: '121813'
last_name: Stamer
- first_name: 'Thomas '
full_name: 'Titz Mite, Thomas '
last_name: Titz Mite
citation:
ama: Stamer F, Titz Mite T. On Chamber-regular C̃₂-Lattices. Published online 2025.
apa: Stamer, F., & Titz Mite, T. (2025). On Chamber-regular C̃₂-Lattices.
bibtex: '@article{Stamer_Titz Mite_2025, title={On Chamber-regular C̃₂-Lattices},
author={Stamer, Franziska and Titz Mite, Thomas }, year={2025} }'
chicago: Stamer, Franziska, and Thomas Titz Mite. “On Chamber-Regular C̃₂-Lattices,”
2025.
ieee: F. Stamer and T. Titz Mite, “On Chamber-regular C̃₂-Lattices.” 2025.
mla: Stamer, Franziska, and Thomas Titz Mite. On Chamber-Regular C̃₂-Lattices.
2025.
short: F. Stamer, T. Titz Mite, (2025).
date_created: 2025-11-19T15:09:51Z
date_updated: 2026-06-30T10:45:29Z
department:
- _id: '10'
external_id:
arxiv:
- '2511.08312'
language:
- iso: eng
page: '29'
status: public
title: On Chamber-regular C̃₂-Lattices
type: preprint
user_id: '121813'
year: '2025'
...
---
_id: '66098'
author:
- first_name: Janina
full_name: Lütke Stockdiek, Janina
last_name: Lütke Stockdiek
- first_name: Britta
full_name: Grimme, Britta
id: '103682'
last_name: Grimme
- first_name: Marie
full_name: Griesbach, Marie
last_name: Griesbach
- first_name: Christian
full_name: Grimme, Christian
last_name: Grimme
citation:
ama: 'Lütke Stockdiek J, Grimme B, Griesbach M, Grimme C. Out of Order: On the Importance
of Word Positions in Explaining Text Classification. In: International Artificial
Intelligence Symposium. ; 2025:432–447.'
apa: 'Lütke Stockdiek, J., Grimme, B., Griesbach, M., & Grimme, C. (2025). Out
of Order: On the Importance of Word Positions in Explaining Text Classification.
International Artificial Intelligence Symposium, 432–447.'
bibtex: '@inproceedings{Lütke Stockdiek_Grimme_Griesbach_Grimme_2025, title={Out
of Order: On the Importance of Word Positions in Explaining Text Classification},
booktitle={International Artificial Intelligence Symposium}, author={Lütke Stockdiek,
Janina and Grimme, Britta and Griesbach, Marie and Grimme, Christian}, year={2025},
pages={432–447} }'
chicago: 'Lütke Stockdiek, Janina, Britta Grimme, Marie Griesbach, and Christian
Grimme. “Out of Order: On the Importance of Word Positions in Explaining Text
Classification.” In International Artificial Intelligence Symposium, 432–447,
2025.'
ieee: 'J. Lütke Stockdiek, B. Grimme, M. Griesbach, and C. Grimme, “Out of Order:
On the Importance of Word Positions in Explaining Text Classification,” in International
Artificial Intelligence Symposium, 2025, pp. 432–447.'
mla: 'Lütke Stockdiek, Janina, et al. “Out of Order: On the Importance of Word Positions
in Explaining Text Classification.” International Artificial Intelligence Symposium,
2025, pp. 432–447.'
short: 'J. Lütke Stockdiek, B. Grimme, M. Griesbach, C. Grimme, in: International
Artificial Intelligence Symposium, 2025, pp. 432–447.'
date_created: 2026-07-01T12:32:42Z
date_updated: 2026-07-01T12:33:09Z
department:
- _id: '819'
language:
- iso: eng
page: 432–447
publication: International Artificial Intelligence Symposium
status: public
title: 'Out of Order: On the Importance of Word Positions in Explaining Text Classification'
type: conference
user_id: '15504'
year: '2025'
...
---
_id: '66278'
author:
- first_name: Rolf
full_name: Biehler, Rolf
id: '16274'
last_name: Biehler
- first_name: Takashi
full_name: Kawakami, Takashi
last_name: Kawakami
- first_name: Erna
full_name: Lampen, Erna
last_name: Lampen
- first_name: Travis
full_name: Weiland, Travis
last_name: Weiland
- first_name: Lucía
full_name: Zapata-Cardona, Lucía
last_name: Zapata-Cardona
citation:
ama: Biehler R, Kawakami T, Lampen E, Weiland T, Zapata-Cardona L. Statistics and
data science education as a vehicle for empowering citizens–short summary of a
survey. European Mathematical Society Magazine. 2025;(136):49–52. doi:10.17619/UNIPB/1-2633
apa: Biehler, R., Kawakami, T., Lampen, E., Weiland, T., & Zapata-Cardona, L.
(2025). Statistics and data science education as a vehicle for empowering citizens–short
summary of a survey. European Mathematical Society Magazine, 136,
49–52. https://doi.org/10.17619/UNIPB/1-2633
bibtex: '@article{Biehler_Kawakami_Lampen_Weiland_Zapata-Cardona_2025, title={Statistics
and data science education as a vehicle for empowering citizens–short summary
of a survey}, DOI={10.17619/UNIPB/1-2633},
number={136}, journal={European Mathematical Society Magazine}, author={Biehler,
Rolf and Kawakami, Takashi and Lampen, Erna and Weiland, Travis and Zapata-Cardona,
Lucía}, year={2025}, pages={49–52} }'
chicago: 'Biehler, Rolf, Takashi Kawakami, Erna Lampen, Travis Weiland, and Lucía
Zapata-Cardona. “Statistics and Data Science Education as a Vehicle for Empowering
Citizens–Short Summary of a Survey.” European Mathematical Society Magazine,
no. 136 (2025): 49–52. https://doi.org/10.17619/UNIPB/1-2633.'
ieee: 'R. Biehler, T. Kawakami, E. Lampen, T. Weiland, and L. Zapata-Cardona, “Statistics
and data science education as a vehicle for empowering citizens–short summary
of a survey,” European Mathematical Society Magazine, no. 136, pp. 49–52,
2025, doi: 10.17619/UNIPB/1-2633.'
mla: Biehler, Rolf, et al. “Statistics and Data Science Education as a Vehicle for
Empowering Citizens–Short Summary of a Survey.” European Mathematical Society
Magazine, no. 136, 2025, pp. 49–52, doi:10.17619/UNIPB/1-2633.
short: R. Biehler, T. Kawakami, E. Lampen, T. Weiland, L. Zapata-Cardona, European
Mathematical Society Magazine (2025) 49–52.
date_created: 2026-07-06T08:40:10Z
date_updated: 2026-07-06T08:42:10Z
department:
- _id: '363'
doi: 10.17619/UNIPB/1-2633
issue: '136'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.17619/UNIPB/1-2633
oa: '1'
page: 49–52
publication: European Mathematical Society Magazine
status: public
title: Statistics and data science education as a vehicle for empowering citizens–short
summary of a survey
type: journal_article
user_id: '37888'
year: '2025'
...
---
_id: '66520'
author:
- first_name: Lars
full_name: Luchterhandt, Lars
id: '74648'
last_name: Luchterhandt
- first_name: Vivek
full_name: Govindasamy, Vivek
last_name: Govindasamy
- first_name: Yutong
full_name: Wang, Yutong
last_name: Wang
- first_name: Christoph
full_name: Scheytt, Christoph
id: '37144'
last_name: Scheytt
orcid: '0000-0002-5950-6618 '
- first_name: Wolfgang
full_name: Müller, Wolfgang
id: '16243'
last_name: Müller
- first_name: Rainer
full_name: Dömer, Rainer
last_name: Dömer
citation:
ama: 'Luchterhandt L, Govindasamy V, Wang Y, Scheytt C, Müller W, Dömer R. A Quantitative
Guide to Navigate Speed/Accuracy Tradeoffs in System Level Design of RISC-V Processor
Grids. In: 2025 Forum on Specification &Amp; Design Languages (FDL).
IEEE; 2025. doi:10.1109/fdl68117.2025.11165408'
apa: Luchterhandt, L., Govindasamy, V., Wang, Y., Scheytt, C., Müller, W., &
Dömer, R. (2025). A Quantitative Guide to Navigate Speed/Accuracy Tradeoffs in
System Level Design of RISC-V Processor Grids. 2025 Forum on Specification
&Amp; Design Languages (FDL). https://doi.org/10.1109/fdl68117.2025.11165408
bibtex: '@inproceedings{Luchterhandt_Govindasamy_Wang_Scheytt_Müller_Dömer_2025,
title={A Quantitative Guide to Navigate Speed/Accuracy Tradeoffs in System Level
Design of RISC-V Processor Grids}, DOI={10.1109/fdl68117.2025.11165408},
booktitle={2025 Forum on Specification & Design Languages (FDL)},
publisher={IEEE}, author={Luchterhandt, Lars and Govindasamy, Vivek and Wang,
Yutong and Scheytt, Christoph and Müller, Wolfgang and Dömer, Rainer}, year={2025}
}'
chicago: Luchterhandt, Lars, Vivek Govindasamy, Yutong Wang, Christoph Scheytt,
Wolfgang Müller, and Rainer Dömer. “A Quantitative Guide to Navigate Speed/Accuracy
Tradeoffs in System Level Design of RISC-V Processor Grids.” In 2025 Forum
on Specification &Amp; Design Languages (FDL). IEEE, 2025. https://doi.org/10.1109/fdl68117.2025.11165408.
ieee: 'L. Luchterhandt, V. Govindasamy, Y. Wang, C. Scheytt, W. Müller, and R. Dömer,
“A Quantitative Guide to Navigate Speed/Accuracy Tradeoffs in System Level Design
of RISC-V Processor Grids,” 2025, doi: 10.1109/fdl68117.2025.11165408.'
mla: Luchterhandt, Lars, et al. “A Quantitative Guide to Navigate Speed/Accuracy
Tradeoffs in System Level Design of RISC-V Processor Grids.” 2025 Forum on
Specification &Amp; Design Languages (FDL), IEEE, 2025, doi:10.1109/fdl68117.2025.11165408.
short: 'L. Luchterhandt, V. Govindasamy, Y. Wang, C. Scheytt, W. Müller, R. Dömer,
in: 2025 Forum on Specification &Amp; Design Languages (FDL), IEEE, 2025.'
date_created: 2026-07-16T15:15:02Z
date_updated: 2026-07-16T15:17:01Z
department:
- _id: '58'
doi: 10.1109/fdl68117.2025.11165408
language:
- iso: eng
publication: 2025 Forum on Specification & Design Languages (FDL)
publication_status: published
publisher: IEEE
status: public
title: A Quantitative Guide to Navigate Speed/Accuracy Tradeoffs in System Level Design
of RISC-V Processor Grids
type: conference
user_id: '16243'
year: '2025'
...
---
_id: '58801'
abstract:
- lang: eng
text: Iran employs one of the most prominent Internet censors in the world. An important
part of Iran’s censorship apparatus is its analysis of unencrypted protocols such
as HTTP and DNS. During routine evaluations of Iran’s HTTP and DNS censorship,
we noticed several properties we believe to be unknown today. For instance, we
found injections of correct static IPs for some domains such as google.com on
the DNS level, unclear HTTP version parsing, and correlations between DNS and
HTTP censorship. In this paper, we present our findings to the community and discuss
possible takeaways for affected people and the censorship circumvention community.
As some of our findings left us bewildered, we hope to ignite a discussion about
Iran’s censorship behavior. We aim to use the discussion of our work to execute
a thorough analysis and explanation of Iran’s censorship behavior in the future.
author:
- first_name: Felix
full_name: Lange, Felix
id: '67893'
last_name: Lange
- first_name: Niklas
full_name: Niere, Niklas
id: '63563'
last_name: Niere
- first_name: Jonathan
full_name: von Niessen, Jonathan
last_name: von Niessen
- first_name: Dennis
full_name: Suermann, Dennis
last_name: Suermann
- first_name: Nico
full_name: Heitmann, Nico
id: '74619'
last_name: Heitmann
orcid: 0009-0003-7687-7044
- first_name: Juraj
full_name: Somorovsky, Juraj
id: '83504'
last_name: Somorovsky
orcid: 0000-0002-3593-7720
citation:
ama: 'Lange F, Niere N, von Niessen J, Suermann D, Heitmann N, Somorovsky J. I(ra)nconsistencies:
Novel Insights into Iran’s Censorship. In: Proceedings on Privacy Enhancing
Technologies. ; 2025.'
apa: 'Lange, F., Niere, N., von Niessen, J., Suermann, D., Heitmann, N., & Somorovsky,
J. (2025). I(ra)nconsistencies: Novel Insights into Iran’s Censorship. Proceedings
on Privacy Enhancing Technologies. Free and Open Communications on the Internet,
Virtual.'
bibtex: '@inproceedings{Lange_Niere_von Niessen_Suermann_Heitmann_Somorovsky_2025,
title={I(ra)nconsistencies: Novel Insights into Iran’s Censorship}, booktitle={Proceedings
on Privacy Enhancing Technologies}, author={Lange, Felix and Niere, Niklas and
von Niessen, Jonathan and Suermann, Dennis and Heitmann, Nico and Somorovsky,
Juraj}, year={2025} }'
chicago: 'Lange, Felix, Niklas Niere, Jonathan von Niessen, Dennis Suermann, Nico
Heitmann, and Juraj Somorovsky. “I(Ra)Nconsistencies: Novel Insights into Iran’s
Censorship.” In Proceedings on Privacy Enhancing Technologies, 2025.'
ieee: 'F. Lange, N. Niere, J. von Niessen, D. Suermann, N. Heitmann, and J. Somorovsky,
“I(ra)nconsistencies: Novel Insights into Iran’s Censorship,” presented at the
Free and Open Communications on the Internet, Virtual, 2025.'
mla: 'Lange, Felix, et al. “I(Ra)Nconsistencies: Novel Insights into Iran’s Censorship.”
Proceedings on Privacy Enhancing Technologies, 2025.'
short: 'F. Lange, N. Niere, J. von Niessen, D. Suermann, N. Heitmann, J. Somorovsky,
in: Proceedings on Privacy Enhancing Technologies, 2025.'
conference:
end_date: 2025-02-20
location: Virtual
name: Free and Open Communications on the Internet
start_date: 2025-02-20
date_created: 2025-02-24T08:09:56Z
date_updated: 2026-08-17T07:40:31Z
ddc:
- '006'
department:
- _id: '632'
file:
- access_level: local
content_type: application/pdf
creator: flange
date_created: 2025-02-24T08:07:59Z
date_updated: 2026-08-17T07:40:31Z
file_id: '58802'
file_name: foci-2025-0002.pdf
file_size: 535700
relation: main_file
file_date_updated: 2026-08-17T07:40:31Z
has_accepted_license: '1'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.petsymposium.org/foci/2025/foci-2025-0002.pdf
oa: '1'
publication: Proceedings on Privacy Enhancing Technologies
quality_controlled: '1'
status: public
title: 'I(ra)nconsistencies: Novel Insights into Iran’s Censorship'
type: conference
user_id: '63563'
year: '2025'
...
---
_id: '66747'
author:
- first_name: Stefan
full_name: Krauter, Stefan
id: '28836'
last_name: Krauter
orcid: 0000-0002-3594-260X
- first_name: Christian
full_name: Ofenheusle, Christian
last_name: Ofenheusle
- first_name: Ralf
full_name: Haselhuhn, Ralf
last_name: Haselhuhn
citation:
ama: Krauter S, Ofenheusle C, Haselhuhn R. Balkonkraftwerke Kompakt Für Dummies.
Wiley-VCH, Weinheim; 2025.
apa: Krauter, S., Ofenheusle, C., & Haselhuhn, R. (2025). Balkonkraftwerke
kompakt für Dummies. Wiley-VCH, Weinheim.
bibtex: '@book{Krauter_Ofenheusle_Haselhuhn_2025, title={Balkonkraftwerke kompakt
für Dummies}, publisher={Wiley-VCH, Weinheim}, author={Krauter, Stefan and Ofenheusle,
Christian and Haselhuhn, Ralf}, year={2025} }'
chicago: Krauter, Stefan, Christian Ofenheusle, and Ralf Haselhuhn. Balkonkraftwerke
Kompakt Für Dummies. Wiley-VCH, Weinheim, 2025.
ieee: S. Krauter, C. Ofenheusle, and R. Haselhuhn, Balkonkraftwerke kompakt für
Dummies. Wiley-VCH, Weinheim, 2025.
mla: Krauter, Stefan, et al. Balkonkraftwerke Kompakt Für Dummies. Wiley-VCH,
Weinheim, 2025.
short: S. Krauter, C. Ofenheusle, R. Haselhuhn, Balkonkraftwerke Kompakt Für Dummies,
Wiley-VCH, Weinheim, 2025.
date_created: 2026-08-19T13:39:37Z
date_updated: 2026-08-19T13:39:51Z
department:
- _id: '53'
language:
- iso: eng
publication_identifier:
isbn:
- ' 978-3-527-72181-8'
publisher: Wiley-VCH, Weinheim
status: public
title: Balkonkraftwerke kompakt für Dummies
type: book
user_id: '16148'
year: '2025'
...
---
_id: '60891'
abstract:
- lang: eng
text: Straight dielectric waveguide channels made from slabs of thin-film lithium
niobate (TFLN), or lithium niobate on insulator (LNOI), are investigated in the
linear regime, for channels of rib and strip type with common trapezoidal cross
sections, in Z-cut and X-cut samples at varying on-chip orientation. We clarify
the theoretical basis for the waveguides with potentially non-diagonal core permittivity.
Symmetry classes can be distinguished that differ in their consequences for potential
modal degeneracy and polarization conversion. Our rigorous numerical analysis
by means of a finite-element solver takes the anisotropy of the lithium niobate
cores rigorously into account. We discuss extensive data for effective indices,
polarization properties, and hybridization of guided modes, in single- and multimode
channels. Scans over the waveguide width and orientation as primary parameters
are complemented by a series of illustrations of vectorial mode profiles. These
turn out to be essentially complex in cases of X-cut channels at non-crystal-axis-aligned
orientations.
author:
- first_name: Manfred
full_name: Hammer, Manfred
id: '48077'
last_name: Hammer
orcid: 0000-0002-6331-9348
- first_name: Shahriar
full_name: Khan, Shahriar
last_name: Khan
- first_name: Behnood
full_name: Taheri, Behnood
last_name: Taheri
- first_name: Henna
full_name: Farheen, Henna
id: '53444'
last_name: Farheen
orcid: 0000-0001-7730-3489
- first_name: Jens
full_name: Förstner, Jens
id: '158'
last_name: Förstner
orcid: 0000-0001-7059-9862
citation:
ama: 'Hammer M, Khan S, Taheri B, Farheen H, Förstner J. TFLN channel waveguides
of rib and strip type: Properties of guided modes. Optics Continuum. 2025;4(10):2356.
doi:10.1364/optcon.569959'
apa: 'Hammer, M., Khan, S., Taheri, B., Farheen, H., & Förstner, J. (2025).
TFLN channel waveguides of rib and strip type: Properties of guided modes. Optics
Continuum, 4(10), 2356. https://doi.org/10.1364/optcon.569959'
bibtex: '@article{Hammer_Khan_Taheri_Farheen_Förstner_2025, title={TFLN channel
waveguides of rib and strip type: Properties of guided modes}, volume={4}, DOI={10.1364/optcon.569959}, number={10},
journal={Optics Continuum}, publisher={Optica Publishing Group}, author={Hammer,
Manfred and Khan, Shahriar and Taheri, Behnood and Farheen, Henna and Förstner,
Jens}, year={2025}, pages={2356} }'
chicago: 'Hammer, Manfred, Shahriar Khan, Behnood Taheri, Henna Farheen, and Jens
Förstner. “TFLN Channel Waveguides of Rib and Strip Type: Properties of Guided
Modes.” Optics Continuum 4, no. 10 (2025): 2356. https://doi.org/10.1364/optcon.569959.'
ieee: 'M. Hammer, S. Khan, B. Taheri, H. Farheen, and J. Förstner, “TFLN channel
waveguides of rib and strip type: Properties of guided modes,” Optics Continuum,
vol. 4, no. 10, p. 2356, 2025, doi: 10.1364/optcon.569959.'
mla: 'Hammer, Manfred, et al. “TFLN Channel Waveguides of Rib and Strip Type: Properties
of Guided Modes.” Optics Continuum, vol. 4, no. 10, Optica Publishing Group,
2025, p. 2356, doi:10.1364/optcon.569959.'
short: M. Hammer, S. Khan, B. Taheri, H. Farheen, J. Förstner, Optics Continuum
4 (2025) 2356.
date_created: 2025-08-06T09:36:30Z
date_updated: 2026-09-03T09:07:47Z
ddc:
- '530'
department:
- _id: '61'
- _id: '230'
- _id: '429'
- _id: '623'
doi: 10.1364/optcon.569959
file:
- access_level: closed
content_type: application/pdf
creator: fossie
date_created: 2025-10-05T11:48:25Z
date_updated: 2025-10-05T11:48:25Z
file_id: '61516'
file_name: 2025-08 Hammer - Optics Continuum - TFLN channel waveguides of rib and
strip type. Properties of guided modes (official version).pdf
file_size: 5417636
relation: main_file
success: 1
file_date_updated: 2025-10-05T11:48:25Z
has_accepted_license: '1'
intvolume: ' 4'
issue: '10'
keyword:
- tet_topic_waveguide
language:
- iso: eng
main_file_link:
- open_access: '1'
oa: '1'
page: '2356'
publication: Optics Continuum
publication_identifier:
issn:
- 2770-0208
publication_status: published
publisher: Optica Publishing Group
status: public
title: 'TFLN channel waveguides of rib and strip type: Properties of guided modes'
type: journal_article
user_id: '77496'
volume: 4
year: '2025'
...
---
_id: '48632'
abstract:
- lang: eng
text: Digital Servitization is one of the significant trends affecting the manufacturing
industry. Companies try to tackle challenges regarding their differentiation and
profitability using digital services. One specific type of digital services are
smart services, which are digital services built on data from smart products.
Introducing these kinds of offerings into the portfolio of manufacturing companies
is not trivial. Moreover, they require conscious action to align all relevant
capabilities to realize the respective business goals. However, what capabilities
are generally relevant for smart services remains opaque. We conducted a systematic
literature review to identify them and extended the results through an interview
study. Our analysis results in 78 capabilities clustered among 12 principles and
six dimensions. These results provide significant support for the smart service
transformation of manufacturing companies and for structuring the research field
of smart services.
author:
- first_name: Christian
full_name: Koldewey, Christian
id: '43136'
last_name: Koldewey
orcid: https://orcid.org/0000-0001-7992-6399
- first_name: Timm
full_name: Fichtler, Timm
id: '66731'
last_name: Fichtler
orcid: https://orcid.org/0000-0001-6034-4399
- first_name: Michel
full_name: Scholtysik, Michel
id: '50562'
last_name: Scholtysik
- first_name: Jan
full_name: Biehler, Jan
last_name: Biehler
- first_name: Nick
full_name: Schreiner, Nick
last_name: Schreiner
- first_name: Franziska
full_name: Sommer, Franziska
last_name: Sommer
- first_name: Maximilian
full_name: Schacht, Maximilian
last_name: Schacht
- first_name: Jonas
full_name: Kaufmann, Jonas
last_name: Kaufmann
- first_name: Martin
full_name: Rabe, Martin
last_name: Rabe
- first_name: Joachim
full_name: Sedlmeier, Joachim
last_name: Sedlmeier
- first_name: Roman
full_name: Dumitrescu, Roman
id: '16190'
last_name: Dumitrescu
citation:
ama: 'Koldewey C, Fichtler T, Scholtysik M, et al. Exploring Capabilities for the
Smart Service Transformation in Manufacturing: Insights from Theory and Practice.
In: ; 2024.'
apa: 'Koldewey, C., Fichtler, T., Scholtysik, M., Biehler, J., Schreiner, N., Sommer,
F., Schacht, M., Kaufmann, J., Rabe, M., Sedlmeier, J., & Dumitrescu, R. (2024).
Exploring Capabilities for the Smart Service Transformation in Manufacturing:
Insights from Theory and Practice. Hawaii International Conference on System
Sciences, Hawaii.'
bibtex: '@inproceedings{Koldewey_Fichtler_Scholtysik_Biehler_Schreiner_Sommer_Schacht_Kaufmann_Rabe_Sedlmeier_et
al._2024, title={Exploring Capabilities for the Smart Service Transformation in
Manufacturing: Insights from Theory and Practice}, author={Koldewey, Christian
and Fichtler, Timm and Scholtysik, Michel and Biehler, Jan and Schreiner, Nick
and Sommer, Franziska and Schacht, Maximilian and Kaufmann, Jonas and Rabe, Martin
and Sedlmeier, Joachim and et al.}, year={2024} }'
chicago: 'Koldewey, Christian, Timm Fichtler, Michel Scholtysik, Jan Biehler, Nick
Schreiner, Franziska Sommer, Maximilian Schacht, et al. “Exploring Capabilities
for the Smart Service Transformation in Manufacturing: Insights from Theory and
Practice,” 2024.'
ieee: 'C. Koldewey et al., “Exploring Capabilities for the Smart Service
Transformation in Manufacturing: Insights from Theory and Practice,” presented
at the Hawaii International Conference on System Sciences, Hawaii, 2024.'
mla: 'Koldewey, Christian, et al. Exploring Capabilities for the Smart Service
Transformation in Manufacturing: Insights from Theory and Practice. 2024.'
short: 'C. Koldewey, T. Fichtler, M. Scholtysik, J. Biehler, N. Schreiner, F. Sommer,
M. Schacht, J. Kaufmann, M. Rabe, J. Sedlmeier, R. Dumitrescu, in: 2024.'
conference:
end_date: 2024-01-06
location: Hawaii
name: Hawaii International Conference on System Sciences
start_date: 2024-01-03
date_created: 2023-11-06T15:31:32Z
date_updated: 2023-11-06T15:40:33Z
department:
- _id: '563'
- _id: '241'
keyword:
- Digital Servitization
- Transformation
- Capabilities
- Maturity
- Smart Services
language:
- iso: eng
status: public
title: 'Exploring Capabilities for the Smart Service Transformation in Manufacturing:
Insights from Theory and Practice'
type: conference
user_id: '66731'
year: '2024'
...
---
_id: '49354'
author:
- first_name: Lameya
full_name: Afroze, Lameya
last_name: Afroze
- first_name: Silke
full_name: Merkelbach, Silke
last_name: Merkelbach
- first_name: Sebastian
full_name: von Enzberg, Sebastian
last_name: von Enzberg
- first_name: Roman
full_name: Dumitrescu, Roman
id: '16190'
last_name: Dumitrescu
citation:
ama: 'Afroze L, Merkelbach S, von Enzberg S, Dumitrescu R. Domain Knowledge Injection
Guidance for Predictive Maintenance. In: ML4CPS 2023. ; 2024.'
apa: Afroze, L., Merkelbach, S., von Enzberg, S., & Dumitrescu, R. (2024). Domain
Knowledge Injection Guidance for Predictive Maintenance. ML4CPS 2023. ML4CPS
– Machine Learning For Cyber-Physical Systems, Hamburg.
bibtex: '@inproceedings{Afroze_Merkelbach_von Enzberg_Dumitrescu_2024, title={Domain
Knowledge Injection Guidance for Predictive Maintenance}, booktitle={ML4CPS 2023},
author={Afroze, Lameya and Merkelbach, Silke and von Enzberg, Sebastian and Dumitrescu,
Roman}, year={2024} }'
chicago: Afroze, Lameya, Silke Merkelbach, Sebastian von Enzberg, and Roman Dumitrescu.
“Domain Knowledge Injection Guidance for Predictive Maintenance.” In ML4CPS
2023, 2024.
ieee: L. Afroze, S. Merkelbach, S. von Enzberg, and R. Dumitrescu, “Domain Knowledge
Injection Guidance for Predictive Maintenance,” presented at the ML4CPS – Machine
Learning For Cyber-Physical Systems, Hamburg, 2024.
mla: Afroze, Lameya, et al. “Domain Knowledge Injection Guidance for Predictive
Maintenance.” ML4CPS 2023, 2024.
short: 'L. Afroze, S. Merkelbach, S. von Enzberg, R. Dumitrescu, in: ML4CPS 2023,
2024.'
conference:
end_date: 2023-0331
location: Hamburg
name: ML4CPS – Machine Learning For Cyber-Physical Systems
start_date: 2023-03-29
date_created: 2023-11-30T09:59:41Z
date_updated: 2023-11-30T14:09:47Z
department:
- _id: '563'
language:
- iso: eng
publication: ML4CPS 2023
status: public
title: Domain Knowledge Injection Guidance for Predictive Maintenance
type: conference
user_id: '15782'
year: '2024'
...
---
_id: '49364'
author:
- first_name: Michel
full_name: Scholtysik, Michel
id: '50562'
last_name: Scholtysik
- first_name: Malte
full_name: Rohde, Malte
last_name: Rohde
- first_name: Christian
full_name: Koldewey, Christian
id: '43136'
last_name: Koldewey
orcid: https://orcid.org/0000-0001-7992-6399
- first_name: Roman
full_name: Dumitrescu, Roman
id: '16190'
last_name: Dumitrescu
citation:
ama: 'Scholtysik M, Rohde M, Koldewey C, Dumitrescu R. Business strategy taxonomy
and solution patterns for the circular economy. In: ; 2024.'
apa: Scholtysik, M., Rohde, M., Koldewey, C., & Dumitrescu, R. (2024). Business
strategy taxonomy and solution patterns for the circular economy.
bibtex: '@inproceedings{Scholtysik_Rohde_Koldewey_Dumitrescu_2024, title={Business
strategy taxonomy and solution patterns for the circular economy}, author={Scholtysik,
Michel and Rohde, Malte and Koldewey, Christian and Dumitrescu, Roman}, year={2024}
}'
chicago: Scholtysik, Michel, Malte Rohde, Christian Koldewey, and Roman Dumitrescu.
“Business Strategy Taxonomy and Solution Patterns for the Circular Economy,” 2024.
ieee: M. Scholtysik, M. Rohde, C. Koldewey, and R. Dumitrescu, “Business strategy
taxonomy and solution patterns for the circular economy,” 2024.
mla: Scholtysik, Michel, et al. Business Strategy Taxonomy and Solution Patterns
for the Circular Economy. 2024.
short: 'M. Scholtysik, M. Rohde, C. Koldewey, R. Dumitrescu, in: 2024.'
date_created: 2023-11-30T10:57:30Z
date_updated: 2023-11-30T14:27:55Z
department:
- _id: '563'
language:
- iso: eng
status: public
title: Business strategy taxonomy and solution patterns for the circular economy
type: conference
user_id: '50562'
year: '2024'
...
---
_id: '51160'
abstract:
- lang: eng
text: "We rigorously derive novel and sharp finite-data error bounds for highly\r\nsample-efficient
Extended Dynamic Mode Decomposition (EDMD) for both i.i.d. and\r\nergodic sampling.
In particular, we show all results in a very general setting\r\nremoving most
of the typically imposed assumptions such that, among others,\r\ndiscrete- and
continuous-time stochastic processes as well as nonlinear partial\r\ndifferential
equations are contained in the considered system class. Besides\r\nshowing an
exponential rate for i.i.d. sampling, we prove, to the best of our\r\nknowledge,
the first superlinear convergence rates for ergodic sampling of\r\ndeterministic
systems. We verify sharpness of the derived error bounds by\r\nconducting numerical
simulations for highly-complex applications from molecular\r\ndynamics and chaotic
flame propagation."
author:
- first_name: Friedrich M.
full_name: Philipp, Friedrich M.
last_name: Philipp
- first_name: Manuel
full_name: Schaller, Manuel
last_name: Schaller
- first_name: Septimus
full_name: Boshoff, Septimus
last_name: Boshoff
- first_name: Sebastian
full_name: Peitz, Sebastian
id: '47427'
last_name: Peitz
orcid: 0000-0002-3389-793X
- first_name: Feliks
full_name: Nüske, Feliks
last_name: Nüske
- first_name: Karl
full_name: Worthmann, Karl
last_name: Worthmann
citation:
ama: 'Philipp FM, Schaller M, Boshoff S, Peitz S, Nüske F, Worthmann K. Extended
Dynamic Mode Decomposition: Sharp bounds on the sample efficiency. arXiv:240202494.
Published online 2024.'
apa: 'Philipp, F. M., Schaller, M., Boshoff, S., Peitz, S., Nüske, F., & Worthmann,
K. (2024). Extended Dynamic Mode Decomposition: Sharp bounds on the sample efficiency.
In arXiv:2402.02494.'
bibtex: '@article{Philipp_Schaller_Boshoff_Peitz_Nüske_Worthmann_2024, title={Extended
Dynamic Mode Decomposition: Sharp bounds on the sample efficiency}, journal={arXiv:2402.02494},
author={Philipp, Friedrich M. and Schaller, Manuel and Boshoff, Septimus and Peitz,
Sebastian and Nüske, Feliks and Worthmann, Karl}, year={2024} }'
chicago: 'Philipp, Friedrich M., Manuel Schaller, Septimus Boshoff, Sebastian Peitz,
Feliks Nüske, and Karl Worthmann. “Extended Dynamic Mode Decomposition: Sharp
Bounds on the Sample Efficiency.” ArXiv:2402.02494, 2024.'
ieee: 'F. M. Philipp, M. Schaller, S. Boshoff, S. Peitz, F. Nüske, and K. Worthmann,
“Extended Dynamic Mode Decomposition: Sharp bounds on the sample efficiency,”
arXiv:2402.02494. 2024.'
mla: 'Philipp, Friedrich M., et al. “Extended Dynamic Mode Decomposition: Sharp
Bounds on the Sample Efficiency.” ArXiv:2402.02494, 2024.'
short: F.M. Philipp, M. Schaller, S. Boshoff, S. Peitz, F. Nüske, K. Worthmann,
ArXiv:2402.02494 (2024).
date_created: 2024-02-06T08:52:21Z
date_updated: 2024-02-06T08:52:44Z
department:
- _id: '655'
external_id:
arxiv:
- '2402.02494'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/pdf/2402.02494.pdf
oa: '1'
publication: arXiv:2402.02494
status: public
title: 'Extended Dynamic Mode Decomposition: Sharp bounds on the sample efficiency'
type: preprint
user_id: '47427'
year: '2024'
...
---
_id: '51208'
abstract:
- lang: eng
text: AbstractApproximation of subdifferentials
is one of the main tasks when computing descent directions for nonsmooth optimization
problems. In this article, we propose a bisection method for weakly lower semismooth
functions which is able to compute new subgradients that improve a given approximation
in case a direction with insufficient descent was computed. Combined with a recently
proposed deterministic gradient sampling approach, this yields a deterministic
and provably convergent way to approximate subdifferentials for computing descent
directions.
author:
- first_name: Bennet
full_name: Gebken, Bennet
id: '32643'
last_name: Gebken
citation:
ama: Gebken B. A note on the convergence of deterministic gradient sampling in nonsmooth
optimization. Computational Optimization and Applications. Published online
2024. doi:10.1007/s10589-024-00552-0
apa: Gebken, B. (2024). A note on the convergence of deterministic gradient sampling
in nonsmooth optimization. Computational Optimization and Applications.
https://doi.org/10.1007/s10589-024-00552-0
bibtex: '@article{Gebken_2024, title={A note on the convergence of deterministic
gradient sampling in nonsmooth optimization}, DOI={10.1007/s10589-024-00552-0},
journal={Computational Optimization and Applications}, publisher={Springer Science
and Business Media LLC}, author={Gebken, Bennet}, year={2024} }'
chicago: Gebken, Bennet. “A Note on the Convergence of Deterministic Gradient Sampling
in Nonsmooth Optimization.” Computational Optimization and Applications,
2024. https://doi.org/10.1007/s10589-024-00552-0.
ieee: 'B. Gebken, “A note on the convergence of deterministic gradient sampling
in nonsmooth optimization,” Computational Optimization and Applications,
2024, doi: 10.1007/s10589-024-00552-0.'
mla: Gebken, Bennet. “A Note on the Convergence of Deterministic Gradient Sampling
in Nonsmooth Optimization.” Computational Optimization and Applications,
Springer Science and Business Media LLC, 2024, doi:10.1007/s10589-024-00552-0.
short: B. Gebken, Computational Optimization and Applications (2024).
date_created: 2024-02-07T07:23:23Z
date_updated: 2024-02-08T08:05:54Z
department:
- _id: '101'
doi: 10.1007/s10589-024-00552-0
keyword:
- Applied Mathematics
- Computational Mathematics
- Control and Optimization
language:
- iso: eng
publication: Computational Optimization and Applications
publication_identifier:
issn:
- 0926-6003
- 1573-2894
publication_status: published
publisher: Springer Science and Business Media LLC
status: public
title: A note on the convergence of deterministic gradient sampling in nonsmooth optimization
type: journal_article
user_id: '32643'
year: '2024'
...
---
_id: '46019'
abstract:
- lang: eng
text: We derive efficient algorithms to compute weakly Pareto optimal solutions
for smooth, convex and unconstrained multiobjective optimization problems in general
Hilbert spaces. To this end, we define a novel inertial gradient-like dynamical
system in the multiobjective setting, which trajectories converge weakly to Pareto
optimal solutions. Discretization of this system yields an inertial multiobjective
algorithm which generates sequences that converge weakly to Pareto optimal solutions.
We employ Nesterov acceleration to define an algorithm with an improved convergence
rate compared to the plain multiobjective steepest descent method (Algorithm 1).
A further improvement in terms of efficiency is achieved by avoiding the solution
of a quadratic subproblem to compute a common step direction for all objective
functions, which is usually required in first-order methods. Using a different
discretization of our inertial gradient-like dynamical system, we obtain an accelerated
multiobjective gradient method that does not require the solution of a subproblem
in each step (Algorithm 2). While this algorithm does not converge in general,
it yields good results on test problems while being faster than standard steepest
descent.
author:
- first_name: Konstantin
full_name: Sonntag, Konstantin
id: '56399'
last_name: Sonntag
orcid: https://orcid.org/0000-0003-3384-3496
- first_name: Sebastian
full_name: Peitz, Sebastian
id: '47427'
last_name: Peitz
orcid: 0000-0002-3389-793X
citation:
ama: Sonntag K, Peitz S. Fast Multiobjective Gradient Methods with Nesterov Acceleration
via Inertial Gradient-Like Systems. Journal of Optimization Theory and Applications.
Published online 2024. doi:10.1007/s10957-024-02389-3
apa: Sonntag, K., & Peitz, S. (2024). Fast Multiobjective Gradient Methods with
Nesterov Acceleration via Inertial Gradient-Like Systems. Journal of Optimization
Theory and Applications. https://doi.org/10.1007/s10957-024-02389-3
bibtex: '@article{Sonntag_Peitz_2024, title={Fast Multiobjective Gradient Methods
with Nesterov Acceleration via Inertial Gradient-Like Systems}, DOI={10.1007/s10957-024-02389-3},
journal={Journal of Optimization Theory and Applications}, publisher={Springer},
author={Sonntag, Konstantin and Peitz, Sebastian}, year={2024} }'
chicago: Sonntag, Konstantin, and Sebastian Peitz. “Fast Multiobjective Gradient
Methods with Nesterov Acceleration via Inertial Gradient-Like Systems.” Journal
of Optimization Theory and Applications, 2024. https://doi.org/10.1007/s10957-024-02389-3.
ieee: 'K. Sonntag and S. Peitz, “Fast Multiobjective Gradient Methods with Nesterov
Acceleration via Inertial Gradient-Like Systems,” Journal of Optimization Theory
and Applications, 2024, doi: 10.1007/s10957-024-02389-3.'
mla: Sonntag, Konstantin, and Sebastian Peitz. “Fast Multiobjective Gradient Methods
with Nesterov Acceleration via Inertial Gradient-Like Systems.” Journal of
Optimization Theory and Applications, Springer, 2024, doi:10.1007/s10957-024-02389-3.
short: K. Sonntag, S. Peitz, Journal of Optimization Theory and Applications (2024).
date_created: 2023-07-12T06:35:58Z
date_updated: 2024-02-21T10:13:33Z
department:
- _id: '101'
- _id: '655'
doi: 10.1007/s10957-024-02389-3
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://link.springer.com/content/pdf/10.1007/s10957-024-02389-3.pdf
oa: '1'
publication: Journal of Optimization Theory and Applications
publication_status: published
publisher: Springer
status: public
title: Fast Multiobjective Gradient Methods with Nesterov Acceleration via Inertial
Gradient-Like Systems
type: journal_article
user_id: '56399'
year: '2024'
...
---
_id: '51334'
abstract:
- lang: eng
text: The efficient optimization method for locally Lipschitz continuous multiobjective
optimization problems from [1] is extended from finite-dimensional problems to
general Hilbert spaces. The method iteratively computes Pareto critical points,
where in each iteration, an approximation of the subdifferential is computed in
an efficient manner and then used to compute a common descent direction for all
objective functions. To prove convergence, we present some new optimality results
for nonsmooth multiobjective optimization problems in Hilbert spaces. Using these,
we can show that every accumulation point of the sequence generated by our algorithm
is Pareto critical under common assumptions. Computational efficiency for finding
Pareto critical points is numerically demonstrated for multiobjective optimal
control of an obstacle problem.
author:
- first_name: Konstantin
full_name: Sonntag, Konstantin
id: '56399'
last_name: Sonntag
orcid: https://orcid.org/0000-0003-3384-3496
- first_name: Bennet
full_name: Gebken, Bennet
id: '32643'
last_name: Gebken
- first_name: Georg
full_name: Müller, Georg
last_name: Müller
- first_name: Sebastian
full_name: Peitz, Sebastian
id: '47427'
last_name: Peitz
orcid: 0000-0002-3389-793X
- first_name: Stefan
full_name: Volkwein, Stefan
last_name: Volkwein
citation:
ama: Sonntag K, Gebken B, Müller G, Peitz S, Volkwein S. A Descent Method for Nonsmooth
Multiobjective Optimization in Hilbert Spaces. arXiv:240206376. Published
online 2024.
apa: Sonntag, K., Gebken, B., Müller, G., Peitz, S., & Volkwein, S. (2024).
A Descent Method for Nonsmooth Multiobjective Optimization in Hilbert Spaces.
In arXiv:2402.06376.
bibtex: '@article{Sonntag_Gebken_Müller_Peitz_Volkwein_2024, title={A Descent Method
for Nonsmooth Multiobjective Optimization in Hilbert Spaces}, journal={arXiv:2402.06376},
author={Sonntag, Konstantin and Gebken, Bennet and Müller, Georg and Peitz, Sebastian
and Volkwein, Stefan}, year={2024} }'
chicago: Sonntag, Konstantin, Bennet Gebken, Georg Müller, Sebastian Peitz, and
Stefan Volkwein. “A Descent Method for Nonsmooth Multiobjective Optimization in
Hilbert Spaces.” ArXiv:2402.06376, 2024.
ieee: K. Sonntag, B. Gebken, G. Müller, S. Peitz, and S. Volkwein, “A Descent Method
for Nonsmooth Multiobjective Optimization in Hilbert Spaces,” arXiv:2402.06376.
2024.
mla: Sonntag, Konstantin, et al. “A Descent Method for Nonsmooth Multiobjective
Optimization in Hilbert Spaces.” ArXiv:2402.06376, 2024.
short: K. Sonntag, B. Gebken, G. Müller, S. Peitz, S. Volkwein, ArXiv:2402.06376
(2024).
date_created: 2024-02-13T09:35:26Z
date_updated: 2024-02-21T10:21:03Z
department:
- _id: '101'
- _id: '655'
external_id:
arxiv:
- "\t2402.06376"
has_accepted_license: '1'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/2402.06376
oa: '1'
publication: arXiv:2402.06376
status: public
title: A Descent Method for Nonsmooth Multiobjective Optimization in Hilbert Spaces
type: preprint
user_id: '56399'
year: '2024'
...
---
_id: '40171'
abstract:
- lang: eng
text: We present a convolutional framework which significantly reduces the complexity
and thus, the computational effort for distributed reinforcement learning control
of dynamical systems governed by partial differential equations (PDEs). Exploiting
translational equivariances, the high-dimensional distributed control problem
can be transformed into a multi-agent control problem with many identical, uncoupled
agents. Furthermore, using the fact that information is transported with finite
velocity in many cases, the dimension of the agents’ environment can be drastically
reduced using a convolution operation over the state space of the PDE, by which
we effectively tackle the curse of dimensionality otherwise present in deep reinforcement
learning. In this setting, the complexity can be flexibly adjusted via the kernel
width or by using a stride greater than one (meaning that we do not place an actuator
at each sensor location). Moreover, scaling from smaller to larger domains – or
the transfer between different domains – becomes a straightforward task requiring
little effort. We demonstrate the performance of the proposed framework using
several PDE examples with increasing complexity, where stabilization is achieved
by training a low-dimensional deep deterministic policy gradient agent using minimal
computing resources.
article_type: original
author:
- first_name: Sebastian
full_name: Peitz, Sebastian
id: '47427'
last_name: Peitz
orcid: 0000-0002-3389-793X
- first_name: Jan
full_name: Stenner, Jan
id: '65520'
last_name: Stenner
- first_name: Vikas
full_name: Chidananda, Vikas
last_name: Chidananda
- first_name: Oliver
full_name: Wallscheid, Oliver
id: '11291'
last_name: Wallscheid
orcid: https://orcid.org/0000-0001-9362-8777
- first_name: Steven L.
full_name: Brunton, Steven L.
last_name: Brunton
- first_name: Kunihiko
full_name: Taira, Kunihiko
last_name: Taira
citation:
ama: 'Peitz S, Stenner J, Chidananda V, Wallscheid O, Brunton SL, Taira K. Distributed
Control of Partial Differential Equations Using Convolutional Reinforcement Learning.
Physica D: Nonlinear Phenomena. 2024;461:134096. doi:10.1016/j.physd.2024.134096'
apa: 'Peitz, S., Stenner, J., Chidananda, V., Wallscheid, O., Brunton, S. L., &
Taira, K. (2024). Distributed Control of Partial Differential Equations Using
Convolutional Reinforcement Learning. Physica D: Nonlinear Phenomena, 461,
134096. https://doi.org/10.1016/j.physd.2024.134096'
bibtex: '@article{Peitz_Stenner_Chidananda_Wallscheid_Brunton_Taira_2024, title={Distributed
Control of Partial Differential Equations Using Convolutional Reinforcement Learning},
volume={461}, DOI={10.1016/j.physd.2024.134096},
journal={Physica D: Nonlinear Phenomena}, publisher={Elsevier}, author={Peitz,
Sebastian and Stenner, Jan and Chidananda, Vikas and Wallscheid, Oliver and Brunton,
Steven L. and Taira, Kunihiko}, year={2024}, pages={134096} }'
chicago: 'Peitz, Sebastian, Jan Stenner, Vikas Chidananda, Oliver Wallscheid, Steven
L. Brunton, and Kunihiko Taira. “Distributed Control of Partial Differential Equations
Using Convolutional Reinforcement Learning.” Physica D: Nonlinear Phenomena
461 (2024): 134096. https://doi.org/10.1016/j.physd.2024.134096.'
ieee: 'S. Peitz, J. Stenner, V. Chidananda, O. Wallscheid, S. L. Brunton, and K.
Taira, “Distributed Control of Partial Differential Equations Using Convolutional
Reinforcement Learning,” Physica D: Nonlinear Phenomena, vol. 461, p. 134096,
2024, doi: 10.1016/j.physd.2024.134096.'
mla: 'Peitz, Sebastian, et al. “Distributed Control of Partial Differential Equations
Using Convolutional Reinforcement Learning.” Physica D: Nonlinear Phenomena,
vol. 461, Elsevier, 2024, p. 134096, doi:10.1016/j.physd.2024.134096.'
short: 'S. Peitz, J. Stenner, V. Chidananda, O. Wallscheid, S.L. Brunton, K. Taira,
Physica D: Nonlinear Phenomena 461 (2024) 134096.'
date_created: 2023-01-26T07:56:26Z
date_updated: 2024-02-23T10:53:42Z
department:
- _id: '655'
doi: 10.1016/j.physd.2024.134096
intvolume: ' 461'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1016/j.physd.2024.134096
oa: '1'
page: '134096'
publication: 'Physica D: Nonlinear Phenomena'
publisher: Elsevier
status: public
title: Distributed Control of Partial Differential Equations Using Convolutional
Reinforcement Learning
type: journal_article
user_id: '47427'
volume: 461
year: '2024'
...
---
_id: '52318'
author:
- first_name: Svitlana
full_name: Dorociak, Svitlana
last_name: Dorociak
citation:
ama: Dorociak S. Implementierung Eines Algorithmus Zur Motivbasierten Schnitt-Sparsifizierung.;
2024.
apa: Dorociak, S. (2024). Implementierung eines Algorithmus zur motivbasierten
Schnitt-Sparsifizierung.
bibtex: '@book{Dorociak_2024, title={Implementierung eines Algorithmus zur motivbasierten
Schnitt-Sparsifizierung}, author={Dorociak, Svitlana}, year={2024} }'
chicago: Dorociak, Svitlana. Implementierung Eines Algorithmus Zur Motivbasierten
Schnitt-Sparsifizierung, 2024.
ieee: S. Dorociak, Implementierung eines Algorithmus zur motivbasierten Schnitt-Sparsifizierung.
2024.
mla: Dorociak, Svitlana. Implementierung Eines Algorithmus Zur Motivbasierten
Schnitt-Sparsifizierung. 2024.
short: S. Dorociak, Implementierung Eines Algorithmus Zur Motivbasierten Schnitt-Sparsifizierung,
2024.
date_created: 2024-03-05T12:52:59Z
date_updated: 2024-03-05T12:53:25Z
department:
- _id: '34'
- _id: '7'
- _id: '79'
language:
- iso: eng
status: public
supervisor:
- first_name: Christian
full_name: Scheideler, Christian
id: '20792'
last_name: Scheideler
title: Implementierung eines Algorithmus zur motivbasierten Schnitt-Sparsifizierung
type: bachelorsthesis
user_id: '15578'
year: '2024'
...
---
_id: '33461'
abstract:
- lang: eng
text: Data-driven models for nonlinear dynamical systems based on approximating
the underlying Koopman operator or generator have proven to be successful tools
for forecasting, feature learning, state estimation, and control. It has become
well known that the Koopman generators for control-affine systems also have affine
dependence on the input, leading to convenient finite-dimensional bilinear approximations
of the dynamics. Yet there are still two main obstacles that limit the scope of
current approaches for approximating the Koopman generators of systems with actuation.
First, the performance of existing methods depends heavily on the choice of basis
functions over which the Koopman generator is to be approximated; and there is
currently no universal way to choose them for systems that are not measure preserving.
Secondly, if we do not observe the full state, we may not gain access to a sufficiently
rich collection of such functions to describe the dynamics. This is because the
commonly used method of forming time-delayed observables fails when there is actuation.
To remedy these issues, we write the dynamics of observables governed by the Koopman
generator as a bilinear hidden Markov model, and determine the model parameters
using the expectation-maximization (EM) algorithm. The E-step involves a standard
Kalman filter and smoother, while the M-step resembles control-affine dynamic
mode decomposition for the generator. We demonstrate the performance of this method
on three examples, including recovery of a finite-dimensional Koopman-invariant
subspace for an actuated system with a slow manifold; estimation of Koopman eigenfunctions
for the unforced Duffing equation; and model-predictive control of a fluidic pinball
system based only on noisy observations of lift and drag.
author:
- first_name: Samuel E.
full_name: Otto, Samuel E.
last_name: Otto
- first_name: Sebastian
full_name: Peitz, Sebastian
id: '47427'
last_name: Peitz
orcid: 0000-0002-3389-793X
- first_name: Clarence W.
full_name: Rowley, Clarence W.
last_name: Rowley
citation:
ama: Otto SE, Peitz S, Rowley CW. Learning Bilinear Models of Actuated Koopman Generators
from Partially-Observed Trajectories. SIAM Journal on Applied Dynamical Systems.
2024;23(1):885-923. doi:10.1137/22M1523601
apa: Otto, S. E., Peitz, S., & Rowley, C. W. (2024). Learning Bilinear Models
of Actuated Koopman Generators from Partially-Observed Trajectories. SIAM
Journal on Applied Dynamical Systems, 23(1), 885–923. https://doi.org/10.1137/22M1523601
bibtex: '@article{Otto_Peitz_Rowley_2024, title={Learning Bilinear Models of Actuated
Koopman Generators from Partially-Observed Trajectories}, volume={23}, DOI={10.1137/22M1523601}, number={1},
journal={SIAM Journal on Applied Dynamical Systems}, publisher={SIAM}, author={Otto,
Samuel E. and Peitz, Sebastian and Rowley, Clarence W.}, year={2024}, pages={885–923}
}'
chicago: 'Otto, Samuel E., Sebastian Peitz, and Clarence W. Rowley. “Learning Bilinear
Models of Actuated Koopman Generators from Partially-Observed Trajectories.”
SIAM Journal on Applied Dynamical Systems 23, no. 1 (2024): 885–923. https://doi.org/10.1137/22M1523601.'
ieee: 'S. E. Otto, S. Peitz, and C. W. Rowley, “Learning Bilinear Models of Actuated
Koopman Generators from Partially-Observed Trajectories,” SIAM Journal on
Applied Dynamical Systems, vol. 23, no. 1, pp. 885–923, 2024, doi: 10.1137/22M1523601.'
mla: Otto, Samuel E., et al. “Learning Bilinear Models of Actuated Koopman Generators
from Partially-Observed Trajectories.” SIAM Journal on Applied Dynamical Systems,
vol. 23, no. 1, SIAM, 2024, pp. 885–923, doi:10.1137/22M1523601.
short: S.E. Otto, S. Peitz, C.W. Rowley, SIAM Journal on Applied Dynamical Systems
23 (2024) 885–923.
date_created: 2022-09-22T07:21:40Z
date_updated: 2024-03-18T10:40:08Z
department:
- _id: '655'
doi: 10.1137/22M1523601
external_id:
arxiv:
- '2209.09977'
intvolume: ' 23'
issue: '1'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/pdf/2209.09977.pdf
oa: '1'
page: 885-923
project:
- _id: '52'
name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing'
publication: SIAM Journal on Applied Dynamical Systems
publication_status: published
publisher: SIAM
status: public
title: Learning Bilinear Models of Actuated Koopman Generators from Partially-Observed
Trajectories
type: journal_article
user_id: '47427'
volume: 23
year: '2024'
...
---
_id: '52663'
abstract:
- lang: eng
text: "Context\r\nStatic analyses are well-established to aid in understanding bugs
or vulnerabilities during the development process or in large-scale studies. A
low false-positive rate is essential for the adaption in practice and for precise
results of empirical studies. Unfortunately, static analyses tend to report where
a vulnerability manifests rather than the fix location. This can cause presumed
false positives or imprecise results.\r\nMethod\r\nTo address this problem, we
designed an adaption of an existing static analysis algorithm that can distinguish
between a manifestation and fix location, and reports error chains. An error chain
represents at least two interconnected errors that occur successively, thus building
the connection between the fix and manifestation location. We used our tool CogniCryptSUBS
for a case study on 471 GitHub repositories, a performance benchmark to compare
different analysis configurations, and conducted an expert interview.\r\nResult\r\nWe
found that 50 % of the projects with a report had at least one error chain. Our
runtime benchmark demonstrated that our improvement caused only a minimal runtime
overhead of less than 4 %. The results of our expert interview indicate that with
our adapted version participants require fewer executions of the analysis.\r\nConclusion\r\nOur
results indicate that error chains occur frequently in real-world projects, and
ignoring them can lead to imprecise evaluation results. The runtime benchmark
indicates that our tool is a feasible and efficient solution for detecting error
chains in real-world projects. Further, our results gave a hint that the usability
of static analyses may benefit from supporting error chains."
author:
- first_name: Anna-Katharina
full_name: Wickert, Anna-Katharina
last_name: Wickert
- first_name: Michael
full_name: Schlichtig, Michael
id: '32312'
last_name: Schlichtig
orcid: 0000-0001-6600-6171
- first_name: Marvin
full_name: Vogel, Marvin
last_name: Vogel
- first_name: Lukas
full_name: Winter, Lukas
last_name: Winter
- first_name: Mira
full_name: Mezini, Mira
last_name: Mezini
- first_name: Eric
full_name: Bodden, Eric
id: '59256'
last_name: Bodden
orcid: 0000-0003-3470-3647
citation:
ama: Wickert A-K, Schlichtig M, Vogel M, Winter L, Mezini M, Bodden E. Supporting
Error Chains in Static Analysis for Precise Evaluation Results and Enhanced Usability.;
2024.
apa: Wickert, A.-K., Schlichtig, M., Vogel, M., Winter, L., Mezini, M., & Bodden,
E. (2024). Supporting Error Chains in Static Analysis for Precise Evaluation
Results and Enhanced Usability.
bibtex: '@book{Wickert_Schlichtig_Vogel_Winter_Mezini_Bodden_2024, title={Supporting
Error Chains in Static Analysis for Precise Evaluation Results and Enhanced Usability},
author={Wickert, Anna-Katharina and Schlichtig, Michael and Vogel, Marvin and
Winter, Lukas and Mezini, Mira and Bodden, Eric}, year={2024} }'
chicago: Wickert, Anna-Katharina, Michael Schlichtig, Marvin Vogel, Lukas Winter,
Mira Mezini, and Eric Bodden. Supporting Error Chains in Static Analysis for
Precise Evaluation Results and Enhanced Usability, 2024.
ieee: A.-K. Wickert, M. Schlichtig, M. Vogel, L. Winter, M. Mezini, and E. Bodden,
Supporting Error Chains in Static Analysis for Precise Evaluation Results and
Enhanced Usability. 2024.
mla: Wickert, Anna-Katharina, et al. Supporting Error Chains in Static Analysis
for Precise Evaluation Results and Enhanced Usability. 2024.
short: A.-K. Wickert, M. Schlichtig, M. Vogel, L. Winter, M. Mezini, E. Bodden,
Supporting Error Chains in Static Analysis for Precise Evaluation Results and
Enhanced Usability, 2024.
date_created: 2024-03-20T09:28:36Z
date_updated: 2024-03-20T09:32:29Z
department:
- _id: '76'
keyword:
- Static analysis
- error chains
- false positive re- duction
- empirical studies
language:
- iso: eng
main_file_link:
- url: https://arxiv.org/abs/2403.07808
status: public
title: Supporting Error Chains in Static Analysis for Precise Evaluation Results and
Enhanced Usability
type: misc
user_id: '32312'
year: '2024'
...