---
_id: '64985'
abstract:
- lang: eng
text: Modern industrial development has necessitated a wide range of joining technologies.
Self-pierce riveting has become a prevalent technique for sheet metal assembly,
especially in automotive applications. Achieving proper joint geometry and adequate
load-bearing capacity depends on appropriate tool selection and precise process
control. Material properties and condition also play a significant role in process
performance. To accommodate the inevitable variations in component characteristics
during production, a robust and stable joining process is essential. The study
focuses on investigating the influence of preformed joining partners on the joining
process and the joint's load capacity. An EN AW-6014 in T4 condition, as well
as an HCT590X, are used as materials for this study. For this purpose, an exemplary
process chain consisting of the steps of performing, joining, and shear load testing
is studied. Each process step is implemented using an FE model to predict the
outcome of subsequent steps. For analysis of the influence of pre-strain, an optimisation
software is used to plan and execute variations of the process. These variations
are used to create a meta-model that can describe the relationships between pre-forming
and characteristic parameters of subsequent process steps. The resulting model
is validated by comparing simulation and experimental data. Finally, in a novel
approach, the robustness of the presented process chain is analyzed in terms of
a tolerable performance level for the joining partners.
article_number: '100391'
author:
- first_name: Jean-Patrick
full_name: Ludwig, Jean-Patrick
id: '76631'
last_name: Ludwig
- first_name: Emil
full_name: Tolke, Emil
last_name: Tolke
- first_name: Malte Christian
full_name: Schlichter, Malte Christian
id: '61977'
last_name: Schlichter
- first_name: Mathias
full_name: Bobbert, Mathias
id: '7850'
last_name: Bobbert
- first_name: Gerson
full_name: Meschut, Gerson
id: '32056'
last_name: Meschut
orcid: 0000-0002-2763-1246
citation:
ama: Ludwig J-P, Tolke E, Schlichter MC, Bobbert M, Meschut G. Numerical analysis
of the robustness of self-pierce riveting with pre-formed joining partners. Journal
of Advanced Joining Processes. 2026;13. doi:10.1016/j.jajp.2026.100391
apa: Ludwig, J.-P., Tolke, E., Schlichter, M. C., Bobbert, M., & Meschut, G.
(2026). Numerical analysis of the robustness of self-pierce riveting with pre-formed
joining partners. Journal of Advanced Joining Processes, 13, Article
100391. https://doi.org/10.1016/j.jajp.2026.100391
bibtex: '@article{Ludwig_Tolke_Schlichter_Bobbert_Meschut_2026, title={Numerical
analysis of the robustness of self-pierce riveting with pre-formed joining partners},
volume={13}, DOI={10.1016/j.jajp.2026.100391},
number={100391}, journal={Journal of Advanced Joining Processes}, publisher={Elsevier
BV}, author={Ludwig, Jean-Patrick and Tolke, Emil and Schlichter, Malte Christian
and Bobbert, Mathias and Meschut, Gerson}, year={2026} }'
chicago: Ludwig, Jean-Patrick, Emil Tolke, Malte Christian Schlichter, Mathias Bobbert,
and Gerson Meschut. “Numerical Analysis of the Robustness of Self-Pierce Riveting
with Pre-Formed Joining Partners.” Journal of Advanced Joining Processes
13 (2026). https://doi.org/10.1016/j.jajp.2026.100391.
ieee: 'J.-P. Ludwig, E. Tolke, M. C. Schlichter, M. Bobbert, and G. Meschut, “Numerical
analysis of the robustness of self-pierce riveting with pre-formed joining partners,”
Journal of Advanced Joining Processes, vol. 13, Art. no. 100391, 2026,
doi: 10.1016/j.jajp.2026.100391.'
mla: Ludwig, Jean-Patrick, et al. “Numerical Analysis of the Robustness of Self-Pierce
Riveting with Pre-Formed Joining Partners.” Journal of Advanced Joining Processes,
vol. 13, 100391, Elsevier BV, 2026, doi:10.1016/j.jajp.2026.100391.
short: J.-P. Ludwig, E. Tolke, M.C. Schlichter, M. Bobbert, G. Meschut, Journal
of Advanced Joining Processes 13 (2026).
date_created: 2026-03-16T12:30:39Z
date_updated: 2026-03-16T12:38:13Z
department:
- _id: '9'
doi: 10.1016/j.jajp.2026.100391
intvolume: ' 13'
keyword:
- Self-pierce riveting
- FE modelling
- Plastic pre-deformation
- Meta modelling
language:
- iso: eng
project:
- _id: '131'
name: TRR 285 - Project Area A
- _id: '135'
name: TRR 285 - Subproject A01
- _id: '130'
name: 'TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen
Prozessketten'
publication: Journal of Advanced Joining Processes
publication_identifier:
issn:
- 2666-3309
publication_status: published
publisher: Elsevier BV
quality_controlled: '1'
status: public
title: Numerical analysis of the robustness of self-pierce riveting with pre-formed
joining partners
type: journal_article
user_id: '76631'
volume: 13
year: '2026'
...
---
_id: '58492'
abstract:
- lang: eng
text: A coupled finite plasticity ductile damage and failure model is proposed for
the finite element simulation of clinch joining, which incorporates stress-state
dependency and regularisation by gradient-enhancement of the damage variable.
Ductile damage is determined based on a failure indicator governed by a failure
surface in stress space. The latter is exemplary chosen as a combination of the
Hosford–Coulomb and Cockcroft–Latham–Oh failure criteria for the high and low
stress triaxiality range, respectively, to cover the wide stress range encountered
in forming. Damage is coupled to elasto-plasticity to capture the damage-induced
degradation of the stiffness and flow stress. This affects the material behaviour
up to failure, thereby realistically altering the stress state. Consequently,
especially for highly ductile materials, where substantial necking and localisation
precede material fracture, the failure prediction is enhanced. The resulting stress
softening is regularised by gradient-enhancement to obtain mesh-objective results.
The analysis of a modified punch test experiment emphasises how the damage-induced
softening effect can strongly alter the actual stress state towards failure. Moreover,
the impact of successful regularisation is shown, and the applicability of the
damage and failure model to clinch joining is proven.
article_number: '106026'
article_type: original
author:
- first_name: Johannes
full_name: Friedlein, Johannes
last_name: Friedlein
- first_name: Julia
full_name: Mergheim, Julia
last_name: Mergheim
- first_name: Paul
full_name: Steinmann, Paul
last_name: Steinmann
citation:
ama: Friedlein J, Mergheim J, Steinmann P. Modelling of stress-state-dependent ductile
damage with gradient-enhancement exemplified for clinch joining. Journal of
the Mechanics and Physics of Solids. 2025;196. doi:10.1016/j.jmps.2025.106026
apa: Friedlein, J., Mergheim, J., & Steinmann, P. (2025). Modelling of stress-state-dependent
ductile damage with gradient-enhancement exemplified for clinch joining. Journal
of the Mechanics and Physics of Solids, 196, Article 106026. https://doi.org/10.1016/j.jmps.2025.106026
bibtex: '@article{Friedlein_Mergheim_Steinmann_2025, title={Modelling of stress-state-dependent
ductile damage with gradient-enhancement exemplified for clinch joining}, volume={196},
DOI={10.1016/j.jmps.2025.106026},
number={106026}, journal={Journal of the Mechanics and Physics of Solids}, publisher={Elsevier
BV}, author={Friedlein, Johannes and Mergheim, Julia and Steinmann, Paul}, year={2025}
}'
chicago: Friedlein, Johannes, Julia Mergheim, and Paul Steinmann. “Modelling of
Stress-State-Dependent Ductile Damage with Gradient-Enhancement Exemplified for
Clinch Joining.” Journal of the Mechanics and Physics of Solids 196 (2025).
https://doi.org/10.1016/j.jmps.2025.106026.
ieee: 'J. Friedlein, J. Mergheim, and P. Steinmann, “Modelling of stress-state-dependent
ductile damage with gradient-enhancement exemplified for clinch joining,” Journal
of the Mechanics and Physics of Solids, vol. 196, Art. no. 106026, 2025, doi:
10.1016/j.jmps.2025.106026.'
mla: Friedlein, Johannes, et al. “Modelling of Stress-State-Dependent Ductile Damage
with Gradient-Enhancement Exemplified for Clinch Joining.” Journal of the Mechanics
and Physics of Solids, vol. 196, 106026, Elsevier BV, 2025, doi:10.1016/j.jmps.2025.106026.
short: J. Friedlein, J. Mergheim, P. Steinmann, Journal of the Mechanics and Physics
of Solids 196 (2025).
date_created: 2025-01-31T17:04:12Z
date_updated: 2025-01-31T17:06:22Z
doi: 10.1016/j.jmps.2025.106026
intvolume: ' 196'
keyword:
- Finite plasticity
- Ductile damage
- Gradient-enhancement
- Stress-state dependency
- Failure
language:
- iso: eng
project:
- _id: '130'
grant_number: '418701707'
name: 'TRR 285: TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen
Prozessketten'
- _id: '131'
name: 'TRR 285 - A: TRR 285 - Project Area A'
- _id: '139'
name: 'TRR 285 – A05: TRR 285 - Subproject A05'
publication: Journal of the Mechanics and Physics of Solids
publication_identifier:
issn:
- 0022-5096
publication_status: published
publisher: Elsevier BV
status: public
title: Modelling of stress-state-dependent ductile damage with gradient-enhancement
exemplified for clinch joining
type: journal_article
user_id: '84990'
volume: 196
year: '2025'
...
---
_id: '62752'
abstract:
- lang: eng
text: In higher education, assessment/examination procedures should be designed
to form a coherent learning process that is aligned with the intended learning
objectives and planned learning activities. However, in academic teacher education
programmes often use assessment formats that are not well aligned with the demands
of teachers' actual professional practice. Performance-based assessments can offer
an alternative, for example in the form of role-play-based simulations with trained
actors representing typical professional activities in environments of reduced
complexity. We have developed such a performance-based assessment format for physics
teacher education, analogous to the Objective Structured Teaching Examinations
(OSTE) approach used in medical education. The OSTE prototype consists of seven
short simulative assessments, reflecting four areas of competence (Instruction,
Assessment, Pedagogy and Innovation) that form a 90-minute examination course.
In order to investigate prospective physics teachers' perceptions of such an assessment
format in terms of its suitability as a summative examination procedure, we piloted
the OSTE prototype with N = 34 physics student teachers from three German universities
using short questionnaires. The results show that participants perceived the OSTE
prototype as authentic and relevant, but they also highlight the need for adequate
new learning opportunities to prepare for such simulative examinations to be integrated
into teacher education programmes.
author:
- first_name: Christoph
full_name: Vogelsang, Christoph
id: '4245'
last_name: Vogelsang
orcid: 0000-0002-5804-1855
- first_name: Lea
full_name: Grotegut, Lea
id: '34280'
last_name: Grotegut
- first_name: Philipp
full_name: Wotschel, Philipp
id: '89529'
last_name: Wotschel
- first_name: Thomas
full_name: Janzen, Thomas
id: '89329'
last_name: Janzen
orcid: 0009-0003-1941-166X
citation:
ama: 'Vogelsang C, Grotegut L, Wotschel P, Janzen T. Prospective Physics Teachers’
Perceptions of an Objective Structured Teaching Examination (OSTE). In: ; 2025.'
apa: Vogelsang, C., Grotegut, L., Wotschel, P., & Janzen, T. (2025). Prospective
Physics Teachers’ Perceptions of an Objective Structured Teaching Examination
(OSTE). ESERA 2025 Conference, Copenhagen.
bibtex: '@inproceedings{Vogelsang_Grotegut_Wotschel_Janzen_2025, place={Copenhagen},
title={Prospective Physics Teachers’ Perceptions of an Objective Structured
Teaching Examination (OSTE)}, author={Vogelsang, Christoph and Grotegut, Lea and
Wotschel, Philipp and Janzen, Thomas}, year={2025} }'
chicago: Vogelsang, Christoph, Lea Grotegut, Philipp Wotschel, and Thomas Janzen.
“Prospective Physics Teachers’ Perceptions of an Objective Structured Teaching
Examination (OSTE).” Copenhagen, 2025.
ieee: C. Vogelsang, L. Grotegut, P. Wotschel, and T. Janzen, “Prospective Physics
Teachers’ Perceptions of an Objective Structured Teaching Examination (OSTE),”
presented at the ESERA 2025 Conference, Copenhagen, 2025.
mla: Vogelsang, Christoph, et al. Prospective Physics Teachers’ Perceptions
of an Objective Structured Teaching Examination (OSTE). 2025.
short: 'C. Vogelsang, L. Grotegut, P. Wotschel, T. Janzen, in: Copenhagen, 2025.'
conference:
end_date: 2025-08-30
location: Copenhagen
name: ESERA 2025 Conference
start_date: 2025-08-25
date_created: 2025-12-03T08:43:26Z
date_updated: 2025-12-03T08:56:29Z
department:
- _id: '33'
keyword:
- teacher education
- physics
- assessment
- pre-service teachers
language:
- iso: eng
place: Copenhagen
quality_controlled: '1'
status: public
title: Prospective Physics Teachers' Perceptions of an Objective Structured Teaching
Examination (OSTE)
type: conference
user_id: '4245'
year: '2025'
...
---
_id: '58491'
abstract:
- lang: eng
text: Similar to bulk metal forming, clinch joining is characterised by
large plastic deformations and a variety of different 3D stress states, including
severe compression. However, inherent to plastic forming is the nucleation and
growth of defects, whose detrimental effects on the material behaviour can be
described by continuum damage models and eventually lead to material failure.
As the damage evolution strongly depends on the stress state, a stress-state-dependent
model is utilised to correctly track the accumulation. To formulate and parameterise
this model, besides classical experiments, so-called modified punch tests are
also integrated herein to enhance the calibration of the failure model by capturing
a larger range of stress states and metal-forming-specific loading conditions.
Moreover, when highly ductile materials are considered, such as the dual-phase
steel HCT590X and the aluminium alloy EN AW-6014 T4 investigated here, strong
necking and localisation might occur prior to fracture. This can alter the stress
state and affect the actual strain at failure. This influence is captured by coupling
plasticity and damage to incorporate the damage-induced softening effect. Its
relative importance is shown by conducting inverse parameter identifications to
determine damage and failure parameters for both mentioned ductile metals based
on up to 12 different experiments.
article_number: '157'
author:
- first_name: Johannes
full_name: Friedlein, Johannes
last_name: Friedlein
- first_name: Max
full_name: Böhnke, Max
last_name: Böhnke
- first_name: Malte
full_name: Schlichter, Malte
last_name: Schlichter
- first_name: Mathias
full_name: Bobbert, Mathias
last_name: Bobbert
- first_name: Gerson
full_name: Meschut, Gerson
last_name: Meschut
- first_name: Julia
full_name: Mergheim, Julia
last_name: Mergheim
- first_name: Paul
full_name: Steinmann, Paul
last_name: Steinmann
citation:
ama: Friedlein J, Böhnke M, Schlichter M, et al. Material Parameter Identification
for a Stress-State-Dependent Ductile Damage and Failure Model Applied to Clinch
Joining. Journal of Manufacturing and Materials Processing. 2024;8(4).
doi:10.3390/jmmp8040157
apa: Friedlein, J., Böhnke, M., Schlichter, M., Bobbert, M., Meschut, G., Mergheim,
J., & Steinmann, P. (2024). Material Parameter Identification for a Stress-State-Dependent
Ductile Damage and Failure Model Applied to Clinch Joining. Journal of Manufacturing
and Materials Processing, 8(4), Article 157. https://doi.org/10.3390/jmmp8040157
bibtex: '@article{Friedlein_Böhnke_Schlichter_Bobbert_Meschut_Mergheim_Steinmann_2024,
title={Material Parameter Identification for a Stress-State-Dependent Ductile
Damage and Failure Model Applied to Clinch Joining}, volume={8}, DOI={10.3390/jmmp8040157},
number={4157}, journal={Journal of Manufacturing and Materials Processing}, publisher={MDPI
AG}, author={Friedlein, Johannes and Böhnke, Max and Schlichter, Malte and Bobbert,
Mathias and Meschut, Gerson and Mergheim, Julia and Steinmann, Paul}, year={2024}
}'
chicago: Friedlein, Johannes, Max Böhnke, Malte Schlichter, Mathias Bobbert, Gerson
Meschut, Julia Mergheim, and Paul Steinmann. “Material Parameter Identification
for a Stress-State-Dependent Ductile Damage and Failure Model Applied to Clinch
Joining.” Journal of Manufacturing and Materials Processing 8, no. 4 (2024).
https://doi.org/10.3390/jmmp8040157.
ieee: 'J. Friedlein et al., “Material Parameter Identification for a Stress-State-Dependent
Ductile Damage and Failure Model Applied to Clinch Joining,” Journal of Manufacturing
and Materials Processing, vol. 8, no. 4, Art. no. 157, 2024, doi: 10.3390/jmmp8040157.'
mla: Friedlein, Johannes, et al. “Material Parameter Identification for a Stress-State-Dependent
Ductile Damage and Failure Model Applied to Clinch Joining.” Journal of Manufacturing
and Materials Processing, vol. 8, no. 4, 157, MDPI AG, 2024, doi:10.3390/jmmp8040157.
short: J. Friedlein, M. Böhnke, M. Schlichter, M. Bobbert, G. Meschut, J. Mergheim,
P. Steinmann, Journal of Manufacturing and Materials Processing 8 (2024).
date_created: 2025-01-31T16:59:13Z
date_updated: 2025-01-31T17:03:34Z
doi: 10.3390/jmmp8040157
intvolume: ' 8'
issue: '4'
keyword:
- ductile damage
- stress-state dependency
- failure
- parameter identification
- punch test
- clinching
language:
- iso: eng
project:
- _id: '130'
grant_number: '418701707'
name: 'TRR 285: TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen
Prozessketten'
- _id: '131'
name: 'TRR 285 - A: TRR 285 - Project Area A'
- _id: '139'
name: 'TRR 285 – A05: TRR 285 - Subproject A05'
publication: Journal of Manufacturing and Materials Processing
publication_identifier:
issn:
- 2504-4494
publication_status: published
publisher: MDPI AG
status: public
title: Material Parameter Identification for a Stress-State-Dependent Ductile Damage
and Failure Model Applied to Clinch Joining
type: journal_article
user_id: '84990'
volume: 8
year: '2024'
...
---
_id: '61273'
abstract:
- lang: eng
text: "In human-machine explanation interactions, such as tutoring systems or customer
support chatbots, it is important for the machine explainer to infer the human
user's understanding. Nonverbal signals play an important role for expressing
mental states like understanding and confusion in these interactions. However,
an individual's expressions may vary depending on other factors. In cases where
these factors are unknown, machine learning methods that infer understanding from
nonverbal cues become unreliable. Stress for example has been shown to affect
human expression, but it is not clear from the current research how stress affects
the expression of understanding.\r\nTo address this gap, we design a paradigm
that induces understanding and confusion through game rule explanations. During
the explanations, self-perceived understanding and confusion are annotated by
the participants. A stress condition is also introduced to enable the investigation
of changes in the expression of social signals under stress.\r\nWe conducted a
study to validate the stress induction and participants reported a statistically
significant increase in stress during the stress condition compared to the neutral
control condition. \r\nAdditionally, feedback from participants shows that the
paradigm is effective in inducing understanding and confusion. \r\nThis paradigm
paves the way for further studies investigating social signals of understanding
to improve human-machine explanation interactions for varying contexts."
author:
- first_name: Jonas
full_name: Paletschek, Jonas
id: '98941'
last_name: Paletschek
citation:
ama: 'Paletschek J. A Paradigm to Investigate Social Signals of Understanding and
Their Susceptibility to Stress. In: 12th International Conference on Affective
Computing & Intelligent Interaction. IEEE; 2024. doi:10.1109/ACII63134.2024.00040'
apa: Paletschek, J. (2024). A Paradigm to Investigate Social Signals of Understanding
and Their Susceptibility to Stress. 12th International Conference on Affective
Computing & Intelligent Interaction. 12th International Conference on
Affective Computing & Intelligent Interaction, Glasgow. https://doi.org/10.1109/ACII63134.2024.00040
bibtex: '@inproceedings{Paletschek_2024, title={A Paradigm to Investigate Social
Signals of Understanding and Their Susceptibility to Stress}, DOI={10.1109/ACII63134.2024.00040},
booktitle={12th International Conference on Affective Computing & Intelligent
Interaction}, publisher={IEEE}, author={Paletschek, Jonas}, year={2024} }'
chicago: Paletschek, Jonas. “A Paradigm to Investigate Social Signals of Understanding
and Their Susceptibility to Stress.” In 12th International Conference on Affective
Computing & Intelligent Interaction. IEEE, 2024. https://doi.org/10.1109/ACII63134.2024.00040.
ieee: 'J. Paletschek, “A Paradigm to Investigate Social Signals of Understanding
and Their Susceptibility to Stress,” presented at the 12th International Conference
on Affective Computing & Intelligent Interaction, Glasgow, 2024, doi: 10.1109/ACII63134.2024.00040.'
mla: Paletschek, Jonas. “A Paradigm to Investigate Social Signals of Understanding
and Their Susceptibility to Stress.” 12th International Conference on Affective
Computing & Intelligent Interaction, IEEE, 2024, doi:10.1109/ACII63134.2024.00040.
short: 'J. Paletschek, in: 12th International Conference on Affective Computing
& Intelligent Interaction, IEEE, 2024.'
conference:
end_date: 2024-09-18
location: Glasgow
name: 12th International Conference on Affective Computing & Intelligent Interaction
start_date: 2024-09-15
date_created: 2025-09-15T11:24:56Z
date_updated: 2025-09-16T07:57:53Z
ddc:
- '150'
department:
- _id: '660'
doi: 10.1109/ACII63134.2024.00040
file:
- access_level: closed
content_type: application/pdf
creator: paletsch
date_created: 2025-09-15T11:18:01Z
date_updated: 2025-09-15T11:18:01Z
file_id: '61274'
file_name: ACII2024_Camera_Ready.pdf
file_size: 8807478
relation: main_file
success: 1
file_date_updated: 2025-09-15T11:18:01Z
has_accepted_license: '1'
keyword:
- Understanding
- Nonverbal Social Signals
- Stress Induction
- Explanation
- Machine Learning Bias
language:
- iso: eng
project:
- _id: '1200'
name: TRR 318 - Teilprojekt A6 - Inklusive Ko-Konstruktion sozialer Signale des
Verstehens
publication: 12th International Conference on Affective Computing & Intelligent Interaction
publication_status: published
publisher: IEEE
status: public
title: A Paradigm to Investigate Social Signals of Understanding and Their Susceptibility
to Stress
type: conference
user_id: '98941'
year: '2024'
...
---
_id: '56983'
abstract:
- lang: eng
text: Detecting the veracity of a statement automatically is a challenge the world
is grappling with due to the vast amount of data spread across the web. Verifying
a given claim typically entails validating it within the framework of supporting
evidence like a retrieved piece of text. Classifying the stance of the text with
respect to the claim is called stance classification. Despite advancements in
automated fact-checking, most systems still rely on a substantial quantity of
labeled training data, which can be costly. In this work, we avoid the costly
training or fine-tuning of models by reusing pre-trained large language models
together with few-shot in-context learning. Since we do not train any model, our
approach ExPrompt is lightweight, demands fewer resources than other stance classification
methods and can serve as a modern baseline for future developments. At the same
time, our evaluation shows that our approach is able to outperform former state-of-the-art
stance classification approaches regarding accuracy by at least 2 percent. Our
scripts and data used in this paper are available at https://github.com/dice-group/ExPrompt.
author:
- first_name: Umair
full_name: Qudus, Umair
id: '83392'
last_name: Qudus
orcid: 0000-0001-6714-8729
- first_name: Michael
full_name: Röder, Michael
id: '67199'
last_name: Röder
orcid: https://orcid.org/0000-0002-8609-8277
- first_name: Daniel
full_name: Vollmers, Daniel
last_name: Vollmers
- first_name: Axel-Cyrille
full_name: Ngonga Ngomo, Axel-Cyrille
id: '65716'
last_name: Ngonga Ngomo
citation:
ama: 'Qudus U, Röder M, Vollmers D, Ngonga Ngomo A-C. ExPrompt: Augmenting Prompts
Using Examples as Modern Baseline for Stance Classification. In: Proceedings
of the 33rd ACM International Conference on Information and Knowledge Management.
Vol 9. ACM; 2024:3994-3999. doi:10.1145/3627673.3679923'
apa: 'Qudus, U., Röder, M., Vollmers, D., & Ngonga Ngomo, A.-C. (2024). ExPrompt:
Augmenting Prompts Using Examples as Modern Baseline for Stance Classification.
Proceedings of the 33rd ACM International Conference on Information and Knowledge
Management, 9, 3994–3999. https://doi.org/10.1145/3627673.3679923'
bibtex: '@inproceedings{Qudus_Röder_Vollmers_Ngonga Ngomo_2024, title={ExPrompt:
Augmenting Prompts Using Examples as Modern Baseline for Stance Classification},
volume={9}, DOI={10.1145/3627673.3679923},
booktitle={Proceedings of the 33rd ACM International Conference on Information
and Knowledge Management}, publisher={ACM}, author={Qudus, Umair and Röder, Michael
and Vollmers, Daniel and Ngonga Ngomo, Axel-Cyrille}, year={2024}, pages={3994–3999}
}'
chicago: 'Qudus, Umair, Michael Röder, Daniel Vollmers, and Axel-Cyrille Ngonga
Ngomo. “ExPrompt: Augmenting Prompts Using Examples as Modern Baseline for Stance
Classification.” In Proceedings of the 33rd ACM International Conference on
Information and Knowledge Management, 9:3994–99. ACM, 2024. https://doi.org/10.1145/3627673.3679923.'
ieee: 'U. Qudus, M. Röder, D. Vollmers, and A.-C. Ngonga Ngomo, “ExPrompt: Augmenting
Prompts Using Examples as Modern Baseline for Stance Classification,” in Proceedings
of the 33rd ACM International Conference on Information and Knowledge Management,
Boise, ID, USA, 2024, vol. 9, pp. 3994–3999, doi: 10.1145/3627673.3679923.'
mla: 'Qudus, Umair, et al. “ExPrompt: Augmenting Prompts Using Examples as Modern
Baseline for Stance Classification.” Proceedings of the 33rd ACM International
Conference on Information and Knowledge Management, vol. 9, ACM, 2024, pp.
3994–99, doi:10.1145/3627673.3679923.'
short: 'U. Qudus, M. Röder, D. Vollmers, A.-C. Ngonga Ngomo, in: Proceedings of
the 33rd ACM International Conference on Information and Knowledge Management,
ACM, 2024, pp. 3994–3999.'
conference:
end_date: 2024-10-25
location: Boise, ID, USA
name: 'CIKM ''24: Proceedings of the 33rd ACM International Conference on Information
and Knowledge Management'
start_date: 2024-10-21
date_created: 2024-11-11T13:15:25Z
date_updated: 2025-09-11T09:49:07Z
ddc:
- '006'
doi: 10.1145/3627673.3679923
file:
- access_level: closed
content_type: application/pdf
creator: uqudus
date_created: 2024-11-11T13:24:19Z
date_updated: 2024-11-11T13:24:19Z
file_id: '56984'
file_name: public.pdf
file_size: 531579
relation: main_file
success: 1
file_date_updated: 2024-11-11T13:24:19Z
has_accepted_license: '1'
intvolume: ' 9'
keyword:
- Stance Classification
- Few-shot in-context learning
- Pre-trained large language models
language:
- iso: eng
main_file_link:
- url: https://dl.acm.org/doi/10.1145/3627673.3679923
page: 3994 - 3999
popular_science: '1'
project:
- _id: '412'
name: 'NEBULA: Nutzerzentrierte KI-basierte Erkennung von Fake-News und Fehlinformationen'
publication: Proceedings of the 33rd ACM International Conference on Information and
Knowledge Management
publication_identifier:
isbn:
- 79-8-4007-0436-9/24/10
publication_status: published
publisher: ACM
quality_controlled: '1'
status: public
title: 'ExPrompt: Augmenting Prompts Using Examples as Modern Baseline for Stance
Classification'
type: conference
user_id: '83392'
volume: 9
year: '2024'
...
---
_id: '62969'
author:
- first_name: Pascal
full_name: Pollmeier, Pascal
id: '44191'
last_name: Pollmeier
- first_name: Christoph
full_name: Vogelsang, Christoph
id: '4245'
last_name: Vogelsang
orcid: 0000-0002-5804-1855
- first_name: Sabine
full_name: Fechner, Sabine
id: '54823'
last_name: Fechner
orcid: 0000-0001-5645-5870
citation:
ama: 'Pollmeier P, Vogelsang C, Fechner S. Evidence based practice of pre-service
teachers. In: 15th Conference of the European Science Education Research Association
(ESERA). ; 2023.'
apa: Pollmeier, P., Vogelsang, C., & Fechner, S. (2023). Evidence based practice
of pre-service teachers. 15th Conference of the European Science Education
Research Association (ESERA). 15th Conference of the European Science Education
Research Association (ESERA), Cappadocia.
bibtex: '@inproceedings{Pollmeier_Vogelsang_Fechner_2023, title={Evidence based
practice of pre-service teachers}, booktitle={15th Conference of the European
Science Education Research Association (ESERA)}, author={Pollmeier, Pascal and
Vogelsang, Christoph and Fechner, Sabine}, year={2023} }'
chicago: Pollmeier, Pascal, Christoph Vogelsang, and Sabine Fechner. “Evidence Based
Practice of Pre-Service Teachers.” In 15th Conference of the European Science
Education Research Association (ESERA), 2023.
ieee: P. Pollmeier, C. Vogelsang, and S. Fechner, “Evidence based practice of pre-service
teachers,” presented at the 15th Conference of the European Science Education
Research Association (ESERA), Cappadocia, 2023.
mla: Pollmeier, Pascal, et al. “Evidence Based Practice of Pre-Service Teachers.”
15th Conference of the European Science Education Research Association (ESERA),
2023.
short: 'P. Pollmeier, C. Vogelsang, S. Fechner, in: 15th Conference of the European
Science Education Research Association (ESERA), 2023.'
conference:
location: Cappadocia
name: 15th Conference of the European Science Education Research Association (ESERA)
date_created: 2025-12-08T09:56:33Z
date_updated: 2025-12-13T23:45:09Z
department:
- _id: '386'
- _id: '33'
keyword:
- Epistemologie
- Evidenzen
- Daten
- Umgang mit Daten
- Kompetenzen
- Studierende
- pre-service teachers
language:
- iso: eng
publication: 15th Conference of the European Science Education Research Association
(ESERA)
quality_controlled: '1'
status: public
title: Evidence based practice of pre-service teachers
type: conference_abstract
user_id: '54823'
year: '2023'
...
---
_id: '27186'
abstract:
- lang: eng
text: 'The presented paper aims to characterize the damage and fracture behavior
of HX340LAD Micro-Alloyed steels using small punch test. Variations with respect
to punch geometries and cutting clearance are made to describe the damage behavior
of the material under different loading conditions. Experimental investigations
are conducted to identify the crack initiation in the specimens. Furthermore,
the numerical FEM simulations are performed to identify the stress state at crack
initiation. It is shown that different stress states from shear to biaxial tension
can be achieved by changing the geometries of punch and varying the cutting clearance.
Moreover, it is presented how changing the configurations can influence the stress
state variables: Triaxiality and lode angle parameter.'
article_type: original
author:
- first_name: Mortaza
full_name: Otroshi, Mortaza
id: '71269'
last_name: Otroshi
orcid: 0000-0002-8652-9209
- first_name: Gerson
full_name: Meschut, Gerson
id: '32056'
last_name: Meschut
orcid: 0000-0002-2763-1246
citation:
ama: Otroshi M, Meschut G. Influence of cutting clearance and punch geometry on
the stress state in small punch test . Engineering Failure Analysis. 2022;136(c).
doi:10.1016/j.engfailanal.2022.106183
apa: Otroshi, M., & Meschut, G. (2022). Influence of cutting clearance and punch
geometry on the stress state in small punch test . Engineering Failure Analysis,
136(c). https://doi.org/10.1016/j.engfailanal.2022.106183
bibtex: '@article{Otroshi_Meschut_2022, title={Influence of cutting clearance and
punch geometry on the stress state in small punch test }, volume={136}, DOI={10.1016/j.engfailanal.2022.106183},
number={c}, journal={Engineering Failure Analysis}, publisher={Elsevier}, author={Otroshi,
Mortaza and Meschut, Gerson}, year={2022} }'
chicago: Otroshi, Mortaza, and Gerson Meschut. “Influence of Cutting Clearance and
Punch Geometry on the Stress State in Small Punch Test .” Engineering Failure
Analysis 136, no. c (2022). https://doi.org/10.1016/j.engfailanal.2022.106183.
ieee: 'M. Otroshi and G. Meschut, “Influence of cutting clearance and punch geometry
on the stress state in small punch test ,” Engineering Failure Analysis,
vol. 136, no. c, 2022, doi: 10.1016/j.engfailanal.2022.106183.'
mla: Otroshi, Mortaza, and Gerson Meschut. “Influence of Cutting Clearance and Punch
Geometry on the Stress State in Small Punch Test .” Engineering Failure Analysis,
vol. 136, no. c, Elsevier, 2022, doi:10.1016/j.engfailanal.2022.106183.
short: M. Otroshi, G. Meschut, Engineering Failure Analysis 136 (2022).
date_created: 2021-11-07T20:34:51Z
date_updated: 2022-04-25T07:48:20Z
department:
- _id: '157'
doi: 10.1016/j.engfailanal.2022.106183
intvolume: ' 136'
issue: c
keyword:
- Ductile damage
- stress state
- small punch test
- triaxiality
- lode angle parameter
language:
- iso: eng
publication: Engineering Failure Analysis
publication_identifier:
issn:
- 1350-6307
publication_status: published
publisher: Elsevier
quality_controlled: '1'
status: public
title: 'Influence of cutting clearance and punch geometry on the stress state in small
punch test '
type: journal_article
user_id: '71269'
volume: 136
year: '2022'
...
---
_id: '40046'
abstract:
- lang: eng
text: Theoretical approaches to the transformation towards an inclusive educational
system in Germany mostly agree on the involvement of developmental tasks in subject
related research (Hinz, 2011). The common understanding of inclusion as a process
geared towards equal participation of all children (Booth, 2012) requires a reflexive
questioning of established values, attitudes and practices in order to develop
inclusive subject related research, teacher training and teaching and learning
(Pech & Schomaker, 2013). Among other things, this results in consequences for
the design of pre- service teacher training. To a large extent, teacher education
is driven by the promotion of central competencies, interests and self-efficacy
(Baumert & Kunter, 2011). It aims towards the development and realisation of inclusive
interdisciplinary science and social studies (‘Sachunterricht’) in primary education
(Moser, 2018). In conjunction with largely acknowledged constructivist approaches
to teaching and learning (Möller, 2001), the development of personality, the consideration
of basic needs (Deci & Ryan, 1993) and promotion of individual potentials are
repeatedly fundamentally represented in subject related and pedagogical considerations
(Feuser, 1989; GDSU, 2013). Therefore, the aforementioned constructivist approach
is connected to several certain key paradigms for teaching and learning processes
(e.g., Vygotskij, 1978; Posner et al., 1982; van de Pol et al., 2010). In this
regard, the nature of primary school students’ basic needs have empirically not
been sufficiently studied yet. Theoretical frameworks from motivational psychology
(Deci & Ryan, 1993) do not explicitly address how individual needs differ and
how the diversity of needs can be included in joint-learning, multi-perspective
technology education classes. The research project the present paper is part of
aims to develop a research-based concept for the professionalisation of pre-service
teachers in a seminar course. Therefore, the promotion of the pre- service teachers’
interests and self-efficacy expectations have been assessed in a pre-post research
design with a control group visiting another course not related to technology
education and inclusion. The present paper describes and discusses first results
of the project and will give an outlook on subsequent developmental tasks.
author:
- first_name: Franz
full_name: Schröer, Franz
id: '71764'
last_name: Schröer
- first_name: Claudia
full_name: Tenberge, Claudia
id: '67302'
last_name: Tenberge
citation:
ama: 'Schröer F, Tenberge C. How to enable pre-service teachers to design technological
teaching and learning inclusively? – On the nature and consideration of basic
needs in teacher training. In: Gill D, Tuff J, Kennedy T, Pendergast S, Jamil
S, eds. PATT39 - PATT on the Edge Technology, Innovation and Education.
PATT Proceedings. ; 2022:49-57.'
apa: Schröer, F., & Tenberge, C. (2022). How to enable pre-service teachers
to design technological teaching and learning inclusively? – On the nature and
consideration of basic needs in teacher training. In D. Gill, J. Tuff, T. Kennedy,
S. Pendergast, & S. Jamil (Eds.), PATT39 - PATT on the Edge Technology,
Innovation and Education (pp. 49–57).
bibtex: '@inproceedings{Schröer_Tenberge_2022, place={St. John’s, Newfoundland and
Labrador, Canada}, series={PATT Proceedings}, title={How to enable pre-service
teachers to design technological teaching and learning inclusively? – On the nature
and consideration of basic needs in teacher training}, booktitle={PATT39 - PATT
on the Edge Technology, Innovation and Education}, author={Schröer, Franz and
Tenberge, Claudia}, editor={Gill, David and Tuff, Jim and Kennedy, Thomas and
Pendergast, Shawn and Jamil, Sana}, year={2022}, pages={49–57}, collection={PATT
Proceedings} }'
chicago: Schröer, Franz, and Claudia Tenberge. “How to Enable Pre-Service Teachers
to Design Technological Teaching and Learning Inclusively? – On the Nature and
Consideration of Basic Needs in Teacher Training.” In PATT39 - PATT on the
Edge Technology, Innovation and Education, edited by David Gill, Jim Tuff,
Thomas Kennedy, Shawn Pendergast, and Sana Jamil, 49–57. PATT Proceedings. St.
John’s, Newfoundland and Labrador, Canada, 2022.
ieee: F. Schröer and C. Tenberge, “How to enable pre-service teachers to design
technological teaching and learning inclusively? – On the nature and consideration
of basic needs in teacher training,” in PATT39 - PATT on the Edge Technology,
Innovation and Education, St. John’s, Newfoundland and Labrador, Canada, 2022,
pp. 49–57.
mla: Schröer, Franz, and Claudia Tenberge. “How to Enable Pre-Service Teachers to
Design Technological Teaching and Learning Inclusively? – On the Nature and Consideration
of Basic Needs in Teacher Training.” PATT39 - PATT on the Edge Technology,
Innovation and Education, edited by David Gill et al., 2022, pp. 49–57.
short: 'F. Schröer, C. Tenberge, in: D. Gill, J. Tuff, T. Kennedy, S. Pendergast,
S. Jamil (Eds.), PATT39 - PATT on the Edge Technology, Innovation and Education,
St. John’s, Newfoundland and Labrador, Canada, 2022, pp. 49–57.'
conference:
end_date: 2022-06-24
location: St. John’s, Newfoundland and Labrador, Canada
name: PATT39 - PATT on the Edge Technology, Innovation and Education
start_date: 2022-06-21
date_created: 2023-01-25T15:13:45Z
date_updated: 2023-01-25T15:13:57Z
department:
- _id: '588'
editor:
- first_name: David
full_name: Gill, David
last_name: Gill
- first_name: Jim
full_name: Tuff, Jim
last_name: Tuff
- first_name: Thomas
full_name: Kennedy, Thomas
last_name: Kennedy
- first_name: Shawn
full_name: Pendergast, Shawn
last_name: Pendergast
- first_name: Sana
full_name: Jamil, Sana
last_name: Jamil
keyword:
- Inclusion
- basic needs
- pre-service teacher training
- interest
- self-efficacy
language:
- iso: eng
main_file_link:
- url: https://research.edgehill.ac.uk/ws/portalfiles/portal/50821651/patt39_proceedings_june_17_2022.pdf
page: 49-57
place: St. John’s, Newfoundland and Labrador, Canada
publication: PATT39 - PATT on the Edge Technology, Innovation and Education
publication_identifier:
unknown:
- https://research.edgehill.ac.uk/ws/portalfiles/portal/50821651/patt39_proceedings_june_17_2022.pdf
publication_status: published
quality_controlled: '1'
series_title: PATT Proceedings
status: public
title: How to enable pre-service teachers to design technological teaching and learning
inclusively? – On the nature and consideration of basic needs in teacher training
type: conference
user_id: '71764'
year: '2022'
...
---
_id: '25476'
abstract:
- lang: eng
text: This study deals with the damage behavior of metallic materials by the application
of different manufacturing processes and using different optical measurement methods
to identify the crack initiation in the damage specimen. The study is intended
to highlight the importance of considering manufacturing processes and optical
measurement methods in a numerical simulation when analyzing the damage behavior
of metallic materials. To describe the damage behavior of the material in the
process chain simulations, it is important to calibrate the parameters of damage
model more accurately. These parameters are determined using experimental investigation
of desired damage specimens. In this regard, a selected damage specimen manufactured
by different cutting processes is first experimentally and then numerically investigated.
It is shown that the manufacturing process and the optical measurement methods
influence the stress state analyzed in the numerical simulation.
article_type: original
author:
- first_name: Mortaza
full_name: Otroshi, Mortaza
id: '71269'
last_name: Otroshi
orcid: 0000-0002-8652-9209
- first_name: Gerson
full_name: Meschut, Gerson
id: '32056'
last_name: Meschut
orcid: 0000-0002-2763-1246
- first_name: Aathavan
full_name: Nesakumar, Aathavan
last_name: Nesakumar
citation:
ama: Otroshi M, Meschut G, Nesakumar A. The influence of manufacturing processes
and optical measurement methods on the damage behavior of HX340LAD micro-alloyed
steels. Journal of Manufacturing Engineering. 2021;16(3):70-76. doi:https://doi.org/10.37255/jme.v16i3pp070-076
apa: Otroshi, M., Meschut, G., & Nesakumar, A. (2021). The influence of manufacturing
processes and optical measurement methods on the damage behavior of HX340LAD micro-alloyed
steels. Journal of Manufacturing Engineering, 16(3), 70–76. https://doi.org/10.37255/jme.v16i3pp070-076
bibtex: '@article{Otroshi_Meschut_Nesakumar_2021, title={The influence of manufacturing
processes and optical measurement methods on the damage behavior of HX340LAD micro-alloyed
steels}, volume={16}, DOI={https://doi.org/10.37255/jme.v16i3pp070-076},
number={3}, journal={Journal of Manufacturing Engineering}, author={Otroshi, Mortaza
and Meschut, Gerson and Nesakumar, Aathavan}, year={2021}, pages={70–76} }'
chicago: 'Otroshi, Mortaza, Gerson Meschut, and Aathavan Nesakumar. “The Influence
of Manufacturing Processes and Optical Measurement Methods on the Damage Behavior
of HX340LAD Micro-Alloyed Steels.” Journal of Manufacturing Engineering
16, no. 3 (2021): 70–76. https://doi.org/10.37255/jme.v16i3pp070-076.'
ieee: 'M. Otroshi, G. Meschut, and A. Nesakumar, “The influence of manufacturing
processes and optical measurement methods on the damage behavior of HX340LAD micro-alloyed
steels,” Journal of Manufacturing Engineering, vol. 16, no. 3, pp. 70–76,
2021, doi: https://doi.org/10.37255/jme.v16i3pp070-076.'
mla: Otroshi, Mortaza, et al. “The Influence of Manufacturing Processes and Optical
Measurement Methods on the Damage Behavior of HX340LAD Micro-Alloyed Steels.”
Journal of Manufacturing Engineering, vol. 16, no. 3, 2021, pp. 70–76,
doi:https://doi.org/10.37255/jme.v16i3pp070-076.
short: M. Otroshi, G. Meschut, A. Nesakumar, Journal of Manufacturing Engineering
16 (2021) 70–76.
date_created: 2021-10-05T09:11:47Z
date_updated: 2022-04-25T07:48:07Z
department:
- _id: '157'
doi: https://doi.org/10.37255/jme.v16i3pp070-076
intvolume: ' 16'
issue: '3'
keyword:
- Damage behaviour
- Stress triaxiality
- Manufacturing process and Optical measurement
language:
- iso: eng
main_file_link:
- open_access: '1'
url: http://smenec.org/index.php/1/article/view/187
oa: '1'
page: 70-76
publication: Journal of Manufacturing Engineering
publication_status: published
quality_controlled: '1'
status: public
title: The influence of manufacturing processes and optical measurement methods on
the damage behavior of HX340LAD micro-alloyed steels
type: journal_article
user_id: '71269'
volume: 16
year: '2021'
...
---
_id: '20678'
author:
- first_name: Christian Roman
full_name: Bielak, Christian Roman
id: '34782'
last_name: Bielak
- first_name: Max
full_name: Böhnke, Max
id: '45779'
last_name: Böhnke
- first_name: Robert
full_name: Beck, Robert
id: '38279'
last_name: Beck
- first_name: Mathias
full_name: Bobbert, Mathias
id: '7850'
last_name: Bobbert
- first_name: Gerson
full_name: Meschut, Gerson
id: '32056'
last_name: Meschut
orcid: 0000-0002-2763-1246
citation:
ama: Bielak CR, Böhnke M, Beck R, Bobbert M, Meschut G. Numerical analysis of the
robustness of clinching process considering the pre-forming of the parts . Journal
of Advanced Joining Processes . Published online 2020. doi:https://doi.org/10.1016/j.jajp.2020.100038
apa: Bielak, C. R., Böhnke, M., Beck, R., Bobbert, M., & Meschut, G. (2020).
Numerical analysis of the robustness of clinching process considering the pre-forming
of the parts . Journal of Advanced Joining Processes. . https://doi.org/10.1016/j.jajp.2020.100038
bibtex: '@article{Bielak_Böhnke_Beck_Bobbert_Meschut_2020, title={Numerical analysis
of the robustness of clinching process considering the pre-forming of the parts
}, DOI={https://doi.org/10.1016/j.jajp.2020.100038},
journal={Journal of Advanced Joining Processes. }, publisher={Elsevier}, author={Bielak,
Christian Roman and Böhnke, Max and Beck, Robert and Bobbert, Mathias and Meschut,
Gerson}, year={2020} }'
chicago: Bielak, Christian Roman, Max Böhnke, Robert Beck, Mathias Bobbert, and
Gerson Meschut. “Numerical Analysis of the Robustness of Clinching Process Considering
the Pre-Forming of the Parts .” Journal of Advanced Joining Processes. ,
2020. https://doi.org/10.1016/j.jajp.2020.100038.
ieee: 'C. R. Bielak, M. Böhnke, R. Beck, M. Bobbert, and G. Meschut, “Numerical
analysis of the robustness of clinching process considering the pre-forming of
the parts ,” Journal of Advanced Joining Processes. , 2020, doi: https://doi.org/10.1016/j.jajp.2020.100038.'
mla: Bielak, Christian Roman, et al. “Numerical Analysis of the Robustness of Clinching
Process Considering the Pre-Forming of the Parts .” Journal of Advanced Joining
Processes. , Elsevier, 2020, doi:https://doi.org/10.1016/j.jajp.2020.100038.
short: C.R. Bielak, M. Böhnke, R. Beck, M. Bobbert, G. Meschut, Journal of Advanced
Joining Processes. (2020).
date_created: 2020-12-02T16:21:34Z
date_updated: 2022-03-24T09:39:11Z
department:
- _id: '157'
doi: https://doi.org/10.1016/j.jajp.2020.100038
keyword:
- Clinching
- process simulation
- FEM
- pre-straining
- sensitivity analysis
language:
- iso: eng
project:
- _id: '130'
grant_number: '418701707'
name: 'TRR 285: TRR 285'
- _id: '131'
name: 'TRR 285 - A: TRR 285 - Project Area A'
- _id: '135'
name: 'TRR 285 – A01: TRR 285 - Subproject A01'
publication: 'Journal of Advanced Joining Processes. '
publication_identifier:
unknown:
- https://doi.org/10.1016/j.jajp.2020.100038
publication_status: published
publisher: Elsevier
status: public
title: 'Numerical analysis of the robustness of clinching process considering the
pre-forming of the parts '
type: journal_article
user_id: '34782'
year: '2020'
...
---
_id: '13155'
author:
- first_name: Shunji
full_name: Tanaka, Shunji
last_name: Tanaka
- first_name: Kevin
full_name: Tierney, Kevin
last_name: Tierney
citation:
ama: Tanaka S, Tierney K. Solving Real-World Sized Container Pre-Marshalling Problems
with an Iterative Deepening Branch-and-Bound Algorithm. European Journal of
Operational Research. 2018;264(1):165-180. doi:https://doi.org/10.1016/j.ejor.2017.05.046
apa: Tanaka, S., & Tierney, K. (2018). Solving Real-World Sized Container Pre-Marshalling
Problems with an Iterative Deepening Branch-and-Bound Algorithm. European Journal
of Operational Research, 264(1), 165–180. https://doi.org/10.1016/j.ejor.2017.05.046
bibtex: '@article{Tanaka_Tierney_2018, title={Solving Real-World Sized Container
Pre-Marshalling Problems with an Iterative Deepening Branch-and-Bound Algorithm},
volume={264}, DOI={https://doi.org/10.1016/j.ejor.2017.05.046},
number={1}, journal={European Journal of Operational Research}, author={Tanaka,
Shunji and Tierney, Kevin}, year={2018}, pages={165–180} }'
chicago: 'Tanaka, Shunji, and Kevin Tierney. “Solving Real-World Sized Container
Pre-Marshalling Problems with an Iterative Deepening Branch-and-Bound Algorithm.”
European Journal of Operational Research 264, no. 1 (2018): 165–80. https://doi.org/10.1016/j.ejor.2017.05.046.'
ieee: S. Tanaka and K. Tierney, “Solving Real-World Sized Container Pre-Marshalling
Problems with an Iterative Deepening Branch-and-Bound Algorithm,” European
Journal of Operational Research, vol. 264, no. 1, pp. 165–180, 2018.
mla: Tanaka, Shunji, and Kevin Tierney. “Solving Real-World Sized Container Pre-Marshalling
Problems with an Iterative Deepening Branch-and-Bound Algorithm.” European
Journal of Operational Research, vol. 264, no. 1, 2018, pp. 165–80, doi:https://doi.org/10.1016/j.ejor.2017.05.046.
short: S. Tanaka, K. Tierney, European Journal of Operational Research 264 (2018)
165–180.
date_created: 2019-09-09T09:20:25Z
date_updated: 2022-01-06T06:51:29Z
doi: https://doi.org/10.1016/j.ejor.2017.05.046
intvolume: ' 264'
issue: '1'
keyword:
- OR in maritime industry
- Container pre-marshalling
- Terminal operations
language:
- iso: eng
page: 165 - 180
project:
- _id: '52'
name: Computing Resources Provided by the Paderborn Center for Parallel Computing
publication: European Journal of Operational Research
publication_identifier:
issn:
- 0377-2217
status: public
title: Solving Real-World Sized Container Pre-Marshalling Problems with an Iterative
Deepening Branch-and-Bound Algorithm
type: journal_article
user_id: '40778'
volume: 264
year: '2018'
...
---
_id: '9895'
abstract:
- lang: eng
text: Power semiconductor modules are used to control and switch high electrical
currents and voltages. Within the power module package wire bonding is used as
an interconnection technology. In recent years, aluminum wire has been used preferably,
but an ever-growing market of powerful and efficient power modules requires a
material with better mechanical and electrical properties. For this reason, a
technology change from aluminum to copper is indispensable. However, the copper
wire bonding process reacts more sensitive to parameter changes. This makes manufacturing
reliable copper bond connections a challenging task. The aim of the BMBF funded
project Itsowl-InCuB is the development of self-optimizing techniques to enable
the reliable production of copper bond connections under varying conditions. A
model of the process is essential to achieve this aim. This model needs to include
the dynamic elasto-plastic deformation, the ultrasonic softening effect and the
proceeding adhesion between wire and substrate. This paper focusses on the pre-deformation
process. In the touchdown phase, the wire is pressed into the V-groove of the
tool and a small initial contact area between wire and substrate arise. The local
characteristics of the material change abruptly because of the cold forming. Consequently,
the pre-deformation has a strong effect on the joining process. In [1], a pre-cleaning
effect during the touchdown process of aluminum wires by cracking of oxide layers
was presented. These interactions of the process parameters are still largely
unknown for copper. In a first step, this paper validates the importance of modeling
the pre-deformation by showing its impact on the wire deformation characteristic
experimentally. Creating cross-section views of pre-deformed copper wires has
shown a low deformation degree compared to aluminum. By using a digital microscope
and a scanning confocal microscope an analysis about the contact areas and penetration
depths after touchdown has been made. Additionally, it has to be taken into account
that the dynamical touchdown force depends on the touchdown speed and the touchdown
force set in the bonding machine. In order to measure the overshoot in the force
signals, a strain gauge sensor has been used. Subsequently, the affecting factors
have been interpreted independently Furthermore, the material properties of copper
wire have been investigated with tensile tests and hardness measurements. In a
second step, the paper presents finite element models of the touchdown process
for source and destination bonds. These models take the measured overshoot in
the touchdown forces into account. A multi-linear, isotropic material model has
been selected to map the material properties of the copper. A validation of the
model with the experimental determined contact areas, normal pressures and penetration
depths reveals the high model quality. Thus, the simulation is able to calculate
and visualize the three dimensional pre-deformation with an integrated material
parameter of the wire if the touchdown parameters of the bonding machine are known.
Based on the calculated deformation degrees of wire and substrate, it is probably
possible to investigate the effect of the pre-deformation on the pre-cleaning
phase in the copper wire bonding.
author:
- first_name: Andreas
full_name: Unger, Andreas
last_name: Unger
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
- first_name: Simon
full_name: Althoff, Simon
last_name: Althoff
- first_name: Paul
full_name: Eichwald, Paul
last_name: Eichwald
- first_name: Tobias
full_name: Meyer, Tobias
last_name: Meyer
- first_name: Florian
full_name: Eacock, Florian
last_name: Eacock
- first_name: Michael
full_name: Brökelmann, Michael
last_name: Brökelmann
citation:
ama: 'Unger A, Sextro W, Althoff S, et al. Experimental and Numerical Simulation
Study of Pre-Deformed Heavy Copper Wire Wedge Bonds. In: Proceedings of the
47th International Symposium on Microelectronics (IMAPS). San Diego, CA, US;
2014:289-294.'
apa: Unger, A., Sextro, W., Althoff, S., Eichwald, P., Meyer, T., Eacock, F., &
Brökelmann, M. (2014). Experimental and Numerical Simulation Study of Pre-Deformed
Heavy Copper Wire Wedge Bonds. In Proceedings of the 47th International Symposium
on Microelectronics (IMAPS) (pp. 289–294). San Diego, CA, US.
bibtex: '@inproceedings{Unger_Sextro_Althoff_Eichwald_Meyer_Eacock_Brökelmann_2014,
place={San Diego, CA, US}, title={Experimental and Numerical Simulation Study
of Pre-Deformed Heavy Copper Wire Wedge Bonds}, booktitle={Proceedings of the
47th International Symposium on Microelectronics (IMAPS)}, author={Unger, Andreas
and Sextro, Walter and Althoff, Simon and Eichwald, Paul and Meyer, Tobias and
Eacock, Florian and Brökelmann, Michael}, year={2014}, pages={289–294} }'
chicago: Unger, Andreas, Walter Sextro, Simon Althoff, Paul Eichwald, Tobias Meyer,
Florian Eacock, and Michael Brökelmann. “Experimental and Numerical Simulation
Study of Pre-Deformed Heavy Copper Wire Wedge Bonds.” In Proceedings of the
47th International Symposium on Microelectronics (IMAPS), 289–94. San Diego,
CA, US, 2014.
ieee: A. Unger et al., “Experimental and Numerical Simulation Study of Pre-Deformed
Heavy Copper Wire Wedge Bonds,” in Proceedings of the 47th International Symposium
on Microelectronics (IMAPS), 2014, pp. 289–294.
mla: Unger, Andreas, et al. “Experimental and Numerical Simulation Study of Pre-Deformed
Heavy Copper Wire Wedge Bonds.” Proceedings of the 47th International Symposium
on Microelectronics (IMAPS), 2014, pp. 289–94.
short: 'A. Unger, W. Sextro, S. Althoff, P. Eichwald, T. Meyer, F. Eacock, M. Brökelmann,
in: Proceedings of the 47th International Symposium on Microelectronics (IMAPS),
San Diego, CA, US, 2014, pp. 289–294.'
date_created: 2019-05-20T13:35:09Z
date_updated: 2020-05-07T05:33:47Z
department:
- _id: '151'
keyword:
- pre-deformation
- copper wire bonding
- finite element model
language:
- iso: eng
page: 289-294
place: San Diego, CA, US
project:
- _id: '92'
grant_number: 02 PQ2210
name: Intelligente Herstellung zuverlässiger Kupferbondverbindungen
publication: Proceedings of the 47th International Symposium on Microelectronics (IMAPS)
status: public
title: Experimental and Numerical Simulation Study of Pre-Deformed Heavy Copper Wire
Wedge Bonds
type: conference
user_id: '210'
year: '2014'
...
---
_id: '9745'
abstract:
- lang: eng
text: In the modeling of piezoelectric Langevin transducers using usual transfer
matrix methods, some simplifications have been adopted. This leads to reduction
of the model quality. A mixed transfer matrix method is employed in the modeling
of Langevin transducers, where the pre-stressed bolt is modeled as a separate
four-pole element, which is connected to other elements in parallel. Based on
the mixed transfer matrix method, the four (six)-pole element description of the
piezoelectric Langevin transducer is built up and the total transfer matrix relation
is derived. The resonance frequencies of the transducer are calculated and then
measured using the impedance analyzer (HP4192). Experimental result shows that
the mixed transfer matrix method has better modeling quality than the usual transfer
matrix method for the vibration analysis of piezoelectric Langevin transducers.
author:
- first_name: Bo
full_name: Fu, Bo
last_name: Fu
- first_name: Chao
full_name: Li, Chao
last_name: Li
- first_name: Jianming
full_name: Zhang, Jianming
last_name: Zhang
- first_name: Zhenwei
full_name: Huang, Zhenwei
last_name: Huang
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
citation:
ama: Fu B, Li C, Zhang J, Huang Z, Hemsel T. Modeling of Piezoelectric Langevin
Transducers by Using Mixed Transfer Matrix Methods. Journal of Korean Physical
Society. 2010;57(4):929. doi:10.3938/jkps.57.929
apa: Fu, B., Li, C., Zhang, J., Huang, Z., & Hemsel, T. (2010). Modeling of
Piezoelectric Langevin Transducers by Using Mixed Transfer Matrix Methods. Journal
of Korean Physical Society, 57(4), 929. https://doi.org/10.3938/jkps.57.929
bibtex: '@article{Fu_Li_Zhang_Huang_Hemsel_2010, title={Modeling of Piezoelectric
Langevin Transducers by Using Mixed Transfer Matrix Methods}, volume={57}, DOI={10.3938/jkps.57.929}, number={4},
journal={Journal of Korean Physical Society}, author={Fu, Bo and Li, Chao and
Zhang, Jianming and Huang, Zhenwei and Hemsel, Tobias}, year={2010}, pages={929}
}'
chicago: 'Fu, Bo, Chao Li, Jianming Zhang, Zhenwei Huang, and Tobias Hemsel. “Modeling
of Piezoelectric Langevin Transducers by Using Mixed Transfer Matrix Methods.”
Journal of Korean Physical Society 57, no. 4 (2010): 929. https://doi.org/10.3938/jkps.57.929.'
ieee: B. Fu, C. Li, J. Zhang, Z. Huang, and T. Hemsel, “Modeling of Piezoelectric
Langevin Transducers by Using Mixed Transfer Matrix Methods,” Journal of Korean
Physical Society, vol. 57, no. 4, p. 929, 2010.
mla: Fu, Bo, et al. “Modeling of Piezoelectric Langevin Transducers by Using Mixed
Transfer Matrix Methods.” Journal of Korean Physical Society, vol. 57,
no. 4, 2010, p. 929, doi:10.3938/jkps.57.929.
short: B. Fu, C. Li, J. Zhang, Z. Huang, T. Hemsel, Journal of Korean Physical Society
57 (2010) 929.
date_created: 2019-05-13T09:40:42Z
date_updated: 2022-01-06T07:04:19Z
department:
- _id: '151'
doi: 10.3938/jkps.57.929
intvolume: ' 57'
issue: '4'
keyword:
- Piezoelectric langevin transducer
- Transfer matrix method
- Four (six)-pole element description
- Pre-stressed bolt
language:
- iso: eng
page: '929'
publication: Journal of Korean Physical Society
publication_identifier:
issn:
- 1948-5719
quality_controlled: '1'
status: public
title: Modeling of Piezoelectric Langevin Transducers by Using Mixed Transfer Matrix
Methods
type: journal_article
user_id: '55222'
volume: 57
year: '2010'
...
---
_id: '9568'
abstract:
- lang: eng
text: A simple pre-stress estimate method of Langevin transducers is studied. The
measurement setup consists of a capacitor, an impedance converter and a voltmeter.
Based on the piezoelectric equation and the basic circuit theory, the mathematical
expression between the pre-stress and the voltage across the capacitor is derived.
The pre-stress level can then be calculated out of the measurement of the capacitor
voltage. In order to evaluate the precision of this method, a force washer is
used to measure the pre-stress of the Langevin transducer. The result shows the
pre-stress level obtained from this method is 30-40\% higher than the pre-stress
level measured by the force washer. This method is simple and can be used to estimate
the pre-stress of various Langevin transducers. The precision of this method can
be raised if d33 is identified under different pre-stress levels.
author:
- first_name: Fu
full_name: Bo, Fu
last_name: Bo
- first_name: Li
full_name: Ting, Li
last_name: Ting
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
citation:
ama: 'Bo F, Ting L, Hemsel T. A simple pre-stress estimating method of langevin
transducers. In: Piezoelectricity, Acoustic Waves, and Device Applications,
2008. SPAWDA 2008. Symposium On. ; 2008:324-327. doi:10.1109/SPAWDA.2008.4775801'
apa: Bo, F., Ting, L., & Hemsel, T. (2008). A simple pre-stress estimating method
of langevin transducers. In Piezoelectricity, Acoustic Waves, and Device Applications,
2008. SPAWDA 2008. Symposium on (pp. 324–327). https://doi.org/10.1109/SPAWDA.2008.4775801
bibtex: '@inproceedings{Bo_Ting_Hemsel_2008, title={A simple pre-stress estimating
method of langevin transducers}, DOI={10.1109/SPAWDA.2008.4775801},
booktitle={Piezoelectricity, Acoustic Waves, and Device Applications, 2008. SPAWDA
2008. Symposium on}, author={Bo, Fu and Ting, Li and Hemsel, Tobias}, year={2008},
pages={324–327} }'
chicago: Bo, Fu, Li Ting, and Tobias Hemsel. “A Simple Pre-Stress Estimating Method
of Langevin Transducers.” In Piezoelectricity, Acoustic Waves, and Device Applications,
2008. SPAWDA 2008. Symposium On, 324–27, 2008. https://doi.org/10.1109/SPAWDA.2008.4775801.
ieee: F. Bo, L. Ting, and T. Hemsel, “A simple pre-stress estimating method of langevin
transducers,” in Piezoelectricity, Acoustic Waves, and Device Applications,
2008. SPAWDA 2008. Symposium on, 2008, pp. 324–327.
mla: Bo, Fu, et al. “A Simple Pre-Stress Estimating Method of Langevin Transducers.”
Piezoelectricity, Acoustic Waves, and Device Applications, 2008. SPAWDA 2008.
Symposium On, 2008, pp. 324–27, doi:10.1109/SPAWDA.2008.4775801.
short: 'F. Bo, L. Ting, T. Hemsel, in: Piezoelectricity, Acoustic Waves, and Device
Applications, 2008. SPAWDA 2008. Symposium On, 2008, pp. 324–327.'
date_created: 2019-04-29T11:16:13Z
date_updated: 2022-01-06T07:04:16Z
department:
- _id: '151'
doi: 10.1109/SPAWDA.2008.4775801
keyword:
- capacitors
- impedance convertors
- piezoelectric transducers
- stress analysis
- Langevin transducers
- basic circuit theory
- capacitor
- impedance converter
- piezoelectric equation
- pre-stress estimating method
- voltmeter
- Capacitors
- Educational institutions
- Equations
- Force measurement
- Impedance measurement
- Manufacturing
- Mechatronics
- Piezoelectric transducers
- Voltage
- Voltmeters
- Langevin transducer
- capacitor
- piezoelectric element
- pre-stress
language:
- iso: eng
page: 324-327
publication: Piezoelectricity, Acoustic Waves, and Device Applications, 2008. SPAWDA
2008. Symposium on
status: public
title: A simple pre-stress estimating method of langevin transducers
type: conference
user_id: '55222'
year: '2008'
...