---
_id: '21808'
abstract:
- lang: eng
text: "Modern services consist of interconnected components,e.g., microservices
in a service mesh or machine learning functions in a pipeline. These services
can scale and run across multiple network nodes on demand. To process incoming
traffic, service components have to be instantiated and traffic assigned to these
instances, taking capacities, changing demands, and Quality of Service (QoS) requirements
into account. This challenge is usually solved with custom approaches designed
by experts. While this typically works well for the considered scenario, the models
often rely on unrealistic assumptions or on knowledge that is not available in
practice (e.g., a priori knowledge).\r\n\r\nWe propose DeepCoord, a novel deep
reinforcement learning approach that learns how to best coordinate services and
is geared towards realistic assumptions. It interacts with the network and relies
on available, possibly delayed monitoring information. Rather than defining a
complex model or an algorithm on how to achieve an objective, our model-free approach
adapts to various objectives and traffic patterns. An agent is trained offline
without expert knowledge and then applied online with minimal overhead. Compared
to a state-of-the-art heuristic, DeepCoord significantly improves flow throughput
(up to 76%) and overall network utility (more than 2x) on realworld network topologies
and traffic traces. It also supports optimizing multiple, possibly competing objectives,
learns to respect QoS requirements, generalizes to scenarios with unseen, stochastic
traffic, and scales to large real-world networks. For reproducibility and reuse,
our code is publicly available."
article_type: original
author:
- first_name: Stefan Balthasar
full_name: Schneider, Stefan Balthasar
id: '35343'
last_name: Schneider
orcid: 0000-0001-8210-4011
- first_name: Ramin
full_name: Khalili, Ramin
last_name: Khalili
- first_name: Adnan
full_name: Manzoor, Adnan
last_name: Manzoor
- first_name: Haydar
full_name: Qarawlus, Haydar
last_name: Qarawlus
- first_name: Rafael
full_name: Schellenberg, Rafael
last_name: Schellenberg
- first_name: Holger
full_name: Karl, Holger
id: '126'
last_name: Karl
- first_name: Artur
full_name: Hecker, Artur
last_name: Hecker
citation:
ama: Schneider SB, Khalili R, Manzoor A, et al. Self-Learning Multi-Objective Service
Coordination Using Deep Reinforcement Learning. Transactions on Network and
Service Management. 2021. doi:10.1109/TNSM.2021.3076503
apa: Schneider, S. B., Khalili, R., Manzoor, A., Qarawlus, H., Schellenberg, R.,
Karl, H., & Hecker, A. (2021). Self-Learning Multi-Objective Service Coordination
Using Deep Reinforcement Learning. Transactions on Network and Service Management.
https://doi.org/10.1109/TNSM.2021.3076503
bibtex: '@article{Schneider_Khalili_Manzoor_Qarawlus_Schellenberg_Karl_Hecker_2021,
title={Self-Learning Multi-Objective Service Coordination Using Deep Reinforcement
Learning}, DOI={10.1109/TNSM.2021.3076503},
journal={Transactions on Network and Service Management}, publisher={IEEE}, author={Schneider,
Stefan Balthasar and Khalili, Ramin and Manzoor, Adnan and Qarawlus, Haydar and
Schellenberg, Rafael and Karl, Holger and Hecker, Artur}, year={2021} }'
chicago: Schneider, Stefan Balthasar, Ramin Khalili, Adnan Manzoor, Haydar Qarawlus,
Rafael Schellenberg, Holger Karl, and Artur Hecker. “Self-Learning Multi-Objective
Service Coordination Using Deep Reinforcement Learning.” Transactions on Network
and Service Management, 2021. https://doi.org/10.1109/TNSM.2021.3076503.
ieee: S. B. Schneider et al., “Self-Learning Multi-Objective Service Coordination
Using Deep Reinforcement Learning,” Transactions on Network and Service Management,
2021.
mla: Schneider, Stefan Balthasar, et al. “Self-Learning Multi-Objective Service
Coordination Using Deep Reinforcement Learning.” Transactions on Network and
Service Management, IEEE, 2021, doi:10.1109/TNSM.2021.3076503.
short: S.B. Schneider, R. Khalili, A. Manzoor, H. Qarawlus, R. Schellenberg, H.
Karl, A. Hecker, Transactions on Network and Service Management (2021).
date_created: 2021-04-27T08:04:16Z
date_updated: 2022-01-06T06:55:15Z
ddc:
- '000'
department:
- _id: '75'
doi: 10.1109/TNSM.2021.3076503
file:
- access_level: open_access
content_type: application/pdf
creator: stschn
date_created: 2021-04-27T08:01:26Z
date_updated: 2021-04-27T08:01:26Z
description: Author version of the accepted paper
file_id: '21809'
file_name: ris-accepted-version.pdf
file_size: 4172270
relation: main_file
file_date_updated: 2021-04-27T08:01:26Z
has_accepted_license: '1'
keyword:
- network management
- service management
- coordination
- reinforcement learning
- self-learning
- self-adaptation
- multi-objective
language:
- iso: eng
oa: '1'
project:
- _id: '1'
name: SFB 901
- _id: '4'
name: SFB 901 - Project Area C
- _id: '16'
name: SFB 901 - Subproject C4
publication: Transactions on Network and Service Management
publisher: IEEE
status: public
title: Self-Learning Multi-Objective Service Coordination Using Deep Reinforcement
Learning
type: journal_article
user_id: '35343'
year: '2021'
...
---
_id: '33854'
abstract:
- lang: eng
text: "Macrodiversity is a key technique to increase the capacity of mobile networks.
It can be realized using coordinated multipoint (CoMP), simultaneously connecting
users to multiple overlapping cells. Selecting which users to serve by how many
and which cells is NP-hard but needs to happen continuously in real time as users
move and channel state changes. Existing approaches often require strict assumptions
about or perfect knowledge of the underlying radio system, its resource allocation
scheme, or user movements, none of which is readily available in practice.\r\n\r\nInstead,
we propose three novel self-learning and self-adapting approaches using model-free
deep reinforcement learning (DRL): DeepCoMP, DD-CoMP, and D3-CoMP. DeepCoMP leverages
central observations and control of all users to select cells almost optimally.
DD-CoMP and D3-CoMP use multi-agent DRL, which allows distributed, robust, and
highly scalable coordination. All three approaches learn from experience and self-adapt
to varying scenarios, reaching 2x higher Quality of Experience than other approaches.
They have very few built-in assumptions and do not need prior system knowledge,
making them more robust to change and better applicable in practice than existing
approaches."
author:
- first_name: Stefan Balthasar
full_name: Schneider, Stefan Balthasar
id: '35343'
last_name: Schneider
orcid: 0000-0001-8210-4011
- first_name: Holger
full_name: Karl, Holger
id: '126'
last_name: Karl
- first_name: Ramin
full_name: Khalili, Ramin
last_name: Khalili
- first_name: Artur
full_name: Hecker, Artur
last_name: Hecker
citation:
ama: 'Schneider SB, Karl H, Khalili R, Hecker A. DeepCoMP: Coordinated Multipoint
Using Multi-Agent Deep Reinforcement Learning.; 2021.'
apa: 'Schneider, S. B., Karl, H., Khalili, R., & Hecker, A. (2021). DeepCoMP:
Coordinated Multipoint Using Multi-Agent Deep Reinforcement Learning.'
bibtex: '@book{Schneider_Karl_Khalili_Hecker_2021, title={DeepCoMP: Coordinated
Multipoint Using Multi-Agent Deep Reinforcement Learning}, author={Schneider,
Stefan Balthasar and Karl, Holger and Khalili, Ramin and Hecker, Artur}, year={2021}
}'
chicago: 'Schneider, Stefan Balthasar, Holger Karl, Ramin Khalili, and Artur Hecker.
DeepCoMP: Coordinated Multipoint Using Multi-Agent Deep Reinforcement Learning,
2021.'
ieee: 'S. B. Schneider, H. Karl, R. Khalili, and A. Hecker, DeepCoMP: Coordinated
Multipoint Using Multi-Agent Deep Reinforcement Learning. 2021.'
mla: 'Schneider, Stefan Balthasar, et al. DeepCoMP: Coordinated Multipoint Using
Multi-Agent Deep Reinforcement Learning. 2021.'
short: 'S.B. Schneider, H. Karl, R. Khalili, A. Hecker, DeepCoMP: Coordinated Multipoint
Using Multi-Agent Deep Reinforcement Learning, 2021.'
date_created: 2022-10-20T16:44:19Z
date_updated: 2022-11-18T09:59:27Z
ddc:
- '004'
department:
- _id: '75'
file:
- access_level: open_access
content_type: application/pdf
creator: stschn
date_created: 2022-10-20T16:41:10Z
date_updated: 2022-10-20T16:41:10Z
file_id: '33855'
file_name: preprint.pdf
file_size: 2521656
relation: main_file
file_date_updated: 2022-10-20T16:41:10Z
has_accepted_license: '1'
keyword:
- mobility management
- coordinated multipoint
- CoMP
- cell selection
- resource management
- reinforcement learning
- multi agent
- MARL
- self-learning
- self-adaptation
- QoE
language:
- iso: eng
oa: '1'
project:
- _id: '4'
name: 'SFB 901 - C: SFB 901 - Project Area C'
- _id: '16'
name: 'SFB 901 - C4: SFB 901 - Subproject C4'
- _id: '1'
name: 'SFB 901: SFB 901'
status: public
title: 'DeepCoMP: Coordinated Multipoint Using Multi-Agent Deep Reinforcement Learning'
type: working_paper
user_id: '477'
year: '2021'
...
---
_id: '37136'
abstract:
- lang: eng
text: This study examines the relation between voluntary audit and the cost of debt
in private firms. We use a sample of 4,058 small private firms operating in the
period 2006‐2017 that are not subject to mandatory audits. Firms decide for a
voluntary audit of financial statements either because the economic setting in
which they operate effectively forces them to do so (e.g., ownership complexity,
export‐oriented supply chain, subsidiary status) or because firm fundamentals
and/or financial reporting practices limit their access to financial debt, both
reflected in earnings quality. We use these factors to model the decision for
voluntary audit. In the outcome analyses, we find robust evidence that voluntary
audits are associated with higher, rather than lower, interest rate by up to 3.0
percentage points. This effect is present regardless of the perceived audit quality
(Big‐4 vs. non‐Big‐4), but is stronger for non‐Big‐4 audits where auditees have
a stronger position relative to auditors. Audited firms’ earnings are less informative
about future operating performance relative to unaudited counterparts. We conclude
that voluntary audits facilitate access to financial debt for firms with higher
risk that may otherwise have no access to this form of financing. The price paid
is reflected in higher interest rates charged to firms with voluntary audits –
firms with higher information and/or fundamental risk.
author:
- first_name: Riste
full_name: Ichev, Riste
last_name: Ichev
- first_name: Jernej
full_name: Koren, Jernej
last_name: Koren
- first_name: Urska
full_name: Kosi, Urska
id: '54068'
last_name: Kosi
- first_name: Katarina
full_name: Sitar Sustar, Katarina
last_name: Sitar Sustar
- first_name: Aljosa
full_name: Valentincic, Aljosa
last_name: Valentincic
citation:
ama: 'Ichev R, Koren J, Kosi U, Sitar Sustar K, Valentincic A. Cost of Debt for
Private Firms Revisited: Voluntary Audits as a Reflection of Risk.; 2021.'
apa: 'Ichev, R., Koren, J., Kosi, U., Sitar Sustar, K., & Valentincic, A. (2021).
Cost of Debt for Private Firms Revisited: Voluntary Audits as a Reflection
of Risk.'
bibtex: '@book{Ichev_Koren_Kosi_Sitar Sustar_Valentincic_2021, title={Cost of Debt
for Private Firms Revisited: Voluntary Audits as a Reflection of Risk}, author={Ichev,
Riste and Koren, Jernej and Kosi, Urska and Sitar Sustar, Katarina and Valentincic,
Aljosa}, year={2021} }'
chicago: 'Ichev, Riste, Jernej Koren, Urska Kosi, Katarina Sitar Sustar, and Aljosa
Valentincic. Cost of Debt for Private Firms Revisited: Voluntary Audits as
a Reflection of Risk, 2021.'
ieee: 'R. Ichev, J. Koren, U. Kosi, K. Sitar Sustar, and A. Valentincic, Cost
of Debt for Private Firms Revisited: Voluntary Audits as a Reflection of Risk.
2021.'
mla: 'Ichev, Riste, et al. Cost of Debt for Private Firms Revisited: Voluntary
Audits as a Reflection of Risk. 2021.'
short: 'R. Ichev, J. Koren, U. Kosi, K. Sitar Sustar, A. Valentincic, Cost of Debt
for Private Firms Revisited: Voluntary Audits as a Reflection of Risk, 2021.'
date_created: 2023-01-17T15:03:08Z
date_updated: 2023-01-18T13:40:40Z
department:
- _id: '635'
- _id: '186'
- _id: '551'
keyword:
- private firms
- voluntary audit
- cost of debt
- self‐selection bias
- risk
language:
- iso: eng
main_file_link:
- url: https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3853927
status: public
title: 'Cost of Debt for Private Firms Revisited: Voluntary Audits as a Reflection
of Risk'
type: working_paper
user_id: '88603'
year: '2021'
...
---
_id: '22930'
abstract:
- lang: eng
text: Self-piercing riveting is an established technique for joining multi-material
structures in car body manufacturing. Rivets for self-piercing riveting differ
in their geometry, the material used, the condition of the material and their
surface condition. To shorten the manufacturing process by omitting the heat treatment
and the coating process, the authors have elaborated a concept for the use of
stainless steel with high strain hardening as a rivet material. The focus of the
present investigation is on the evaluation of the influences of the rivet’s geometry
and material on its deformation behaviour. Conventional rivets of types P and
HD2, a rivet with an improved geometry made of treatable steel 38B2, and rivets
made of the stainless steels 1.3815 and 1.4541 are examined. The analysis is conducted
by means of multi-step joining tests for two material combinations comprising
high-strength steel HCT70X and aluminium EN AW-5083. The joints are cut to provide
a cross-section and the deformation behaviour of the different rivets is analysed
on the basis of the measured changes in geometry and hardness. In parallel, an
examination of the force-stroke curves provides further insights. It can be demonstrated
that, besides the geometry, the material strength, in particular, has a significant
influence on the deformation behaviour of the rivet. The strength of steel 1.4541
is seen to be too low for the joining task, while the strength of steel 1.3815
is sufficient, and hence the investigation confirms the capability of rivets made
of 1.3815 for joining even challenging material combinations.
author:
- first_name: Benedikt
full_name: Uhe, Benedikt
id: '38131'
last_name: Uhe
- first_name: Clara-Maria
full_name: Kuball, Clara-Maria
last_name: Kuball
- first_name: Marion
full_name: Merklein, Marion
last_name: Merklein
- first_name: Gerson
full_name: Meschut, Gerson
id: '32056'
last_name: Meschut
orcid: 0000-0002-2763-1246
citation:
ama: 'Uhe B, Kuball C-M, Merklein M, Meschut G. Self-Piercing Riveting Using Rivets
Made of Stainless Steel with High Strain Hardening. In: Daehn G, Cao J, Kinsey
B, Tekkaya E, Vivek A, Yoshida Y, eds. Forming the Future - Proceedings of
the 13th International Conference on the Technology of Plasticity. The Minerals,
Metals & Materials Series. Springer; 2021:1495-1506. doi:10.1007/978-3-030-75381-8_124'
apa: Uhe, B., Kuball, C.-M., Merklein, M., & Meschut, G. (2021). Self-Piercing
Riveting Using Rivets Made of Stainless Steel with High Strain Hardening. In G.
Daehn, J. Cao, B. Kinsey, E. Tekkaya, A. Vivek, & Y. Yoshida (Eds.), Forming
the Future - Proceedings of the 13th International Conference on the Technology
of Plasticity. The Minerals, Metals & Materials Series. (pp. 1495–1506).
Springer. https://doi.org/10.1007/978-3-030-75381-8_124
bibtex: '@inbook{Uhe_Kuball_Merklein_Meschut_2021, place={Cham}, title={Self-Piercing
Riveting Using Rivets Made of Stainless Steel with High Strain Hardening}, DOI={10.1007/978-3-030-75381-8_124},
booktitle={Forming the Future - Proceedings of the 13th International Conference
on the Technology of Plasticity. The Minerals, Metals & Materials Series.},
publisher={Springer}, author={Uhe, Benedikt and Kuball, Clara-Maria and Merklein,
Marion and Meschut, Gerson}, editor={Daehn, Glenn and Cao, Jian and Kinsey, Brad
and Tekkaya, Erman and Vivek, Anupam and Yoshida, Yoshinori}, year={2021}, pages={1495–1506}
}'
chicago: 'Uhe, Benedikt, Clara-Maria Kuball, Marion Merklein, and Gerson Meschut.
“Self-Piercing Riveting Using Rivets Made of Stainless Steel with High Strain
Hardening.” In Forming the Future - Proceedings of the 13th International Conference
on the Technology of Plasticity. The Minerals, Metals & Materials Series.,
edited by Glenn Daehn, Jian Cao, Brad Kinsey, Erman Tekkaya, Anupam Vivek, and
Yoshinori Yoshida, 1495–1506. Cham: Springer, 2021. https://doi.org/10.1007/978-3-030-75381-8_124.'
ieee: 'B. Uhe, C.-M. Kuball, M. Merklein, and G. Meschut, “Self-Piercing Riveting
Using Rivets Made of Stainless Steel with High Strain Hardening,” in Forming
the Future - Proceedings of the 13th International Conference on the Technology
of Plasticity. The Minerals, Metals & Materials Series., G. Daehn, J.
Cao, B. Kinsey, E. Tekkaya, A. Vivek, and Y. Yoshida, Eds. Cham: Springer, 2021,
pp. 1495–1506.'
mla: Uhe, Benedikt, et al. “Self-Piercing Riveting Using Rivets Made of Stainless
Steel with High Strain Hardening.” Forming the Future - Proceedings of the
13th International Conference on the Technology of Plasticity. The Minerals, Metals
& Materials Series., edited by Glenn Daehn et al., Springer, 2021, pp.
1495–506, doi:10.1007/978-3-030-75381-8_124.
short: 'B. Uhe, C.-M. Kuball, M. Merklein, G. Meschut, in: G. Daehn, J. Cao, B.
Kinsey, E. Tekkaya, A. Vivek, Y. Yoshida (Eds.), Forming the Future - Proceedings
of the 13th International Conference on the Technology of Plasticity. The Minerals,
Metals & Materials Series., Springer, Cham, 2021, pp. 1495–1506.'
date_created: 2021-08-04T14:02:32Z
date_updated: 2026-02-27T10:40:39Z
department:
- _id: '157'
doi: 10.1007/978-3-030-75381-8_124
editor:
- first_name: Glenn
full_name: Daehn, Glenn
last_name: Daehn
- first_name: Jian
full_name: Cao, Jian
last_name: Cao
- first_name: Brad
full_name: Kinsey, Brad
last_name: Kinsey
- first_name: Erman
full_name: Tekkaya, Erman
last_name: Tekkaya
- first_name: Anupam
full_name: Vivek, Anupam
last_name: Vivek
- first_name: Yoshinori
full_name: Yoshida, Yoshinori
last_name: Yoshida
keyword:
- Self-piercing riveting
- Lightweight design
- Deformation behaviour
- Stainless steel
- High nitrogen steel
language:
- iso: eng
page: 1495-1506
place: Cham
publication: Forming the Future - Proceedings of the 13th International Conference
on the Technology of Plasticity. The Minerals, Metals & Materials Series.
publication_status: published
publisher: Springer
quality_controlled: '1'
status: public
title: Self-Piercing Riveting Using Rivets Made of Stainless Steel with High Strain
Hardening
type: book_chapter
user_id: '53912'
year: '2021'
...
---
_id: '22274'
abstract:
- lang: eng
text: 'The use of high-strength steel and aluminium is rising due to the intensified
efforts being made in lightweight design, and self-piercing riveting is becoming
increasingly important. Conventional rivets for self-piercing riveting differ
in their geometry, the material used, the condition of the material and the coating.
To shorten the manufacturing process, the use of stainless steel with high strain
hardening as the rivet material represents a promising approach. This allows the
coating of the rivets to be omitted due to the corrosion resistance of the material
and, since the strength of the stainless steel is achieved by cold forming, heat
treatment is no longer required. In addition, it is possible to adjust the local
strength within the rivet. Because of that, the authors have elaborated a concept
for using high nitrogen steel 1.3815 as the rivet material. The present investigation
focusses on the joint strength in order to evaluate the capability of rivets in
high nitrogen steel by comparison to conventional rivets made of treatable steel.
Due to certain challenges in the forming process of the high nitrogen steel rivets,
deviations result from the targeted rivet geometry. Mainly these deviations cause
a lower joint strength with these rivets, which is, however, adequate. All in
all, the capability of the new rivet is proven by the results of this investigation. '
author:
- first_name: Benedikt
full_name: Uhe, Benedikt
id: '38131'
last_name: Uhe
- first_name: Clara-Maria
full_name: Kuball, Clara-Maria
last_name: Kuball
- first_name: Marion
full_name: Merklein, Marion
last_name: Merklein
- first_name: Gerson
full_name: Meschut, Gerson
id: '32056'
last_name: Meschut
orcid: 0000-0002-2763-1246
citation:
ama: 'Uhe B, Kuball C-M, Merklein M, Meschut G. Strength of self-piercing riveted
Joints with conventional Rivets and Rivets made of High Nitrogen Steel. In: ;
2021. doi:10.25518/esaform21.1911'
apa: Uhe, B., Kuball, C.-M., Merklein, M., & Meschut, G. (2021). Strength
of self-piercing riveted Joints with conventional Rivets and Rivets made of High
Nitrogen Steel. 24th International Conference on Material Forming (ESAFORM),
Liège, Belgien. https://doi.org/10.25518/esaform21.1911
bibtex: '@inproceedings{Uhe_Kuball_Merklein_Meschut_2021, title={Strength of self-piercing
riveted Joints with conventional Rivets and Rivets made of High Nitrogen Steel},
DOI={10.25518/esaform21.1911},
author={Uhe, Benedikt and Kuball, Clara-Maria and Merklein, Marion and Meschut,
Gerson}, year={2021} }'
chicago: Uhe, Benedikt, Clara-Maria Kuball, Marion Merklein, and Gerson Meschut.
“Strength of Self-Piercing Riveted Joints with Conventional Rivets and Rivets
Made of High Nitrogen Steel,” 2021. https://doi.org/10.25518/esaform21.1911.
ieee: 'B. Uhe, C.-M. Kuball, M. Merklein, and G. Meschut, “Strength of self-piercing
riveted Joints with conventional Rivets and Rivets made of High Nitrogen Steel,”
presented at the 24th International Conference on Material Forming (ESAFORM),
Liège, Belgien, 2021, doi: 10.25518/esaform21.1911.'
mla: Uhe, Benedikt, et al. Strength of Self-Piercing Riveted Joints with Conventional
Rivets and Rivets Made of High Nitrogen Steel. 2021, doi:10.25518/esaform21.1911.
short: 'B. Uhe, C.-M. Kuball, M. Merklein, G. Meschut, in: 2021.'
conference:
end_date: 2021-04-16
location: Liège, Belgien
name: 24th International Conference on Material Forming (ESAFORM)
start_date: 2021-04-14
date_created: 2021-05-31T10:17:37Z
date_updated: 2026-02-27T10:25:13Z
department:
- _id: '157'
doi: 10.25518/esaform21.1911
keyword:
- Self-piercing Riveting
- Joining Technology
- Rivet Geometry
- Rivet Material
- High Nitrogen Steel
- Joint Strength
language:
- iso: eng
quality_controlled: '1'
status: public
title: Strength of self-piercing riveted Joints with conventional Rivets and Rivets
made of High Nitrogen Steel
type: conference
user_id: '53912'
year: '2021'
...
---
_id: '32558'
abstract:
- lang: eng
text: With the rapid progress of technological development, self-efficacy in reference
to digital devices (i.e., information and computer technology [ICT] self-efficacy)
is an important driver that helps students to deal with technological problems
and support their lifelong learning processes. Schools, peers, and home learning
environments are important sources for the development of positive self-efficacy.
Expanding on previous research, we investigated the associations between different
aspects of the digital home learning environment and students’ ICT self-efficacy.
The moderation effects of gender were also tested. A total of 651 children answered
a questionnaire about different digital home learning environment dimensions and
estimated their ICT self-efficacy using an adapted scale—Schwarzer and Jerusalem’s
(1999) general self-efficacy scale. Using the structural equation modeling technique,
a digital home learning environment containing six different qualities of parental
support was investigated. Families’ cultural capital, parents’ attitudes toward
the Internet, and shared Internet activities at home contributed positively to
ICT self-efficacy. We observed small gender differences, with the moderation effect
being nonsignificant. The results help researchers and practitioners to understand
how different dimensions of the digital home learning environment support ICT
self-efficacy. We will discuss how parents can enhance the home learning environment
and how teachers can integrate this knowledge into formal education.
author:
- first_name: Sabrina
full_name: Bonanati, Sabrina
last_name: Bonanati
- first_name: Heike M.
full_name: Buhl, Heike M.
id: '27152'
last_name: Buhl
citation:
ama: Bonanati S, Buhl HM. The digital home learning environment and its relation
to children’s ICT self-efficacy. Learning Environments Research. 2021;25(2):485-505.
doi:10.1007/s10984-021-09377-8
apa: Bonanati, S., & Buhl, H. M. (2021). The digital home learning environment
and its relation to children’s ICT self-efficacy. Learning Environments Research,
25(2), 485–505. https://doi.org/10.1007/s10984-021-09377-8
bibtex: '@article{Bonanati_Buhl_2021, title={The digital home learning environment
and its relation to children’s ICT self-efficacy}, volume={25}, DOI={10.1007/s10984-021-09377-8},
number={2}, journal={Learning Environments Research}, publisher={Springer Science
and Business Media LLC}, author={Bonanati, Sabrina and Buhl, Heike M.}, year={2021},
pages={485–505} }'
chicago: 'Bonanati, Sabrina, and Heike M. Buhl. “The Digital Home Learning Environment
and Its Relation to Children’s ICT Self-Efficacy.” Learning Environments Research
25, no. 2 (2021): 485–505. https://doi.org/10.1007/s10984-021-09377-8.'
ieee: 'S. Bonanati and H. M. Buhl, “The digital home learning environment and its
relation to children’s ICT self-efficacy,” Learning Environments Research,
vol. 25, no. 2, pp. 485–505, 2021, doi: 10.1007/s10984-021-09377-8.'
mla: Bonanati, Sabrina, and Heike M. Buhl. “The Digital Home Learning Environment
and Its Relation to Children’s ICT Self-Efficacy.” Learning Environments Research,
vol. 25, no. 2, Springer Science and Business Media LLC, 2021, pp. 485–505, doi:10.1007/s10984-021-09377-8.
short: S. Bonanati, H.M. Buhl, Learning Environments Research 25 (2021) 485–505.
date_created: 2022-08-03T05:53:48Z
date_updated: 2025-07-16T08:38:51Z
department:
- _id: '427'
doi: 10.1007/s10984-021-09377-8
intvolume: ' 25'
issue: '2'
keyword:
- Digital media use
- Gender
- Home learning environment
- ICT self-efcacy
- Motivation
- Parental involvement
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://link.springer.com/content/pdf/10.1007/s10984-021-09377-8.pdf
oa: '1'
page: 485-505
project:
- _id: '378'
grant_number: 01JD1814A
name: 'DigHomE: DigHomE: Digital Home Learning Environment – Gelingensbedingungen
elterlicher Unterstützung bei der informationsorientierten Internetnutzung'
publication: Learning Environments Research
publication_identifier:
issn:
- 1387-1579
- 1573-1855
publication_status: published
publisher: Springer Science and Business Media LLC
status: public
title: The digital home learning environment and its relation to children’s ICT self-efficacy
type: journal_article
user_id: '27152'
volume: 25
year: '2021'
...
---
_id: '19609'
abstract:
- lang: eng
text: "Modern services comprise interconnected components,\r\ne.g., microservices
in a service mesh, that can scale and\r\nrun on multiple nodes across the network
on demand. To process\r\nincoming traffic, service components have to be instantiated
and\r\ntraffic assigned to these instances, taking capacities and changing\r\ndemands
into account. This challenge is usually solved with\r\ncustom approaches designed
by experts. While this typically\r\nworks well for the considered scenario, the
models often rely\r\non unrealistic assumptions or on knowledge that is not available\r\nin
practice (e.g., a priori knowledge).\r\n\r\nWe propose a novel deep reinforcement
learning approach that\r\nlearns how to best coordinate services and is geared
towards\r\nrealistic assumptions. It interacts with the network and relies on\r\navailable,
possibly delayed monitoring information. Rather than\r\ndefining a complex model
or an algorithm how to achieve an\r\nobjective, our model-free approach adapts
to various objectives\r\nand traffic patterns. An agent is trained offline without
expert\r\nknowledge and then applied online with minimal overhead. Compared\r\nto
a state-of-the-art heuristic, it significantly improves flow\r\nthroughput and
overall network utility on real-world network\r\ntopologies and traffic traces.
It also learns to optimize different\r\nobjectives, generalizes to scenarios with
unseen, stochastic traffic\r\npatterns, and scales to large real-world networks."
author:
- first_name: Stefan Balthasar
full_name: Schneider, Stefan Balthasar
id: '35343'
last_name: Schneider
orcid: 0000-0001-8210-4011
- first_name: Adnan
full_name: Manzoor, Adnan
last_name: Manzoor
- first_name: Haydar
full_name: Qarawlus, Haydar
last_name: Qarawlus
- first_name: Rafael
full_name: Schellenberg, Rafael
last_name: Schellenberg
- first_name: Holger
full_name: Karl, Holger
id: '126'
last_name: Karl
- first_name: Ramin
full_name: Khalili, Ramin
last_name: Khalili
- first_name: Artur
full_name: Hecker, Artur
last_name: Hecker
citation:
ama: 'Schneider SB, Manzoor A, Qarawlus H, et al. Self-Driving Network and Service
Coordination Using Deep Reinforcement Learning. In: IEEE International Conference
on Network and Service Management (CNSM). IEEE; 2020.'
apa: Schneider, S. B., Manzoor, A., Qarawlus, H., Schellenberg, R., Karl, H., Khalili,
R., & Hecker, A. (2020). Self-Driving Network and Service Coordination Using
Deep Reinforcement Learning. In IEEE International Conference on Network and
Service Management (CNSM). IEEE.
bibtex: '@inproceedings{Schneider_Manzoor_Qarawlus_Schellenberg_Karl_Khalili_Hecker_2020,
title={Self-Driving Network and Service Coordination Using Deep Reinforcement
Learning}, booktitle={IEEE International Conference on Network and Service Management
(CNSM)}, publisher={IEEE}, author={Schneider, Stefan Balthasar and Manzoor, Adnan
and Qarawlus, Haydar and Schellenberg, Rafael and Karl, Holger and Khalili, Ramin
and Hecker, Artur}, year={2020} }'
chicago: Schneider, Stefan Balthasar, Adnan Manzoor, Haydar Qarawlus, Rafael Schellenberg,
Holger Karl, Ramin Khalili, and Artur Hecker. “Self-Driving Network and Service
Coordination Using Deep Reinforcement Learning.” In IEEE International Conference
on Network and Service Management (CNSM). IEEE, 2020.
ieee: S. B. Schneider et al., “Self-Driving Network and Service Coordination
Using Deep Reinforcement Learning,” in IEEE International Conference on Network
and Service Management (CNSM), 2020.
mla: Schneider, Stefan Balthasar, et al. “Self-Driving Network and Service Coordination
Using Deep Reinforcement Learning.” IEEE International Conference on Network
and Service Management (CNSM), IEEE, 2020.
short: 'S.B. Schneider, A. Manzoor, H. Qarawlus, R. Schellenberg, H. Karl, R. Khalili,
A. Hecker, in: IEEE International Conference on Network and Service Management
(CNSM), IEEE, 2020.'
date_created: 2020-09-22T06:28:22Z
date_updated: 2022-01-06T06:54:08Z
ddc:
- '006'
department:
- _id: '75'
file:
- access_level: open_access
content_type: application/pdf
creator: stschn
date_created: 2020-09-22T06:29:16Z
date_updated: 2020-09-22T06:36:00Z
file_id: '19610'
file_name: ris_with_copyright.pdf
file_size: 642999
relation: main_file
file_date_updated: 2020-09-22T06:36:00Z
has_accepted_license: '1'
keyword:
- self-driving networks
- self-learning
- network coordination
- service coordination
- reinforcement learning
- deep learning
- nfv
language:
- iso: eng
oa: '1'
project:
- _id: '1'
name: SFB 901
- _id: '4'
name: SFB 901 - Project Area C
- _id: '16'
name: SFB 901 - Subproject C4
publication: IEEE International Conference on Network and Service Management (CNSM)
publisher: IEEE
status: public
title: Self-Driving Network and Service Coordination Using Deep Reinforcement Learning
type: conference
user_id: '35343'
year: '2020'
...
---
_id: '18249'
abstract:
- lang: eng
text: Augmented Reality (AR) has recently found high attention in mobile shopping
apps such as in domains like furniture or decoration. Here, the developers of
the apps focus on the positioning of atomic 3D objects in the physical environment.
With this focus, they neglect the configuration of multi-faceted 3D object composition
according to the user needs and environmental constraints. To tackle these challenges,
we present a model-based approach to support AR-assisted product con-figuration
based on the concept of Dynamic Software Product Lines. Our approach splits products
(e.g. table) into parts (e.g. tabletop, ta-ble legs, funnier) with their 3D objects
and additional information (e.g. name, price). The possible products, which can
be configured out of these parts, are stored in a feature model. At runtime, this
feature model can be used to configure 3D object compositions out of the product
parts and adapt to user needs and environmental constraints. The benefits of this
approach are demonstrated by a case study of configuring modular kitchens with
the help of a prototypical mobile-based implementation.
author:
- first_name: Sebastian
full_name: Gottschalk, Sebastian
id: '47208'
last_name: Gottschalk
- first_name: Enes
full_name: Yigitbas, Enes
id: '8447'
last_name: Yigitbas
orcid: 0000-0002-5967-833X
- first_name: Eugen
full_name: Schmidt, Eugen
last_name: Schmidt
- first_name: Gregor
full_name: Engels, Gregor
id: '107'
last_name: Engels
citation:
ama: 'Gottschalk S, Yigitbas E, Schmidt E, Engels G. Model-based Product Configuration
in Augmented Reality Applications. In: Bernhaupt R, Ardito C, Sauer S, eds. Human-Centered
Software Engineering. HCSE 2020. Vol 12481. Lecture Notes in Computer Science.
Cham: Springer; 2020. doi:10.1007/978-3-030-64266-2_5'
apa: 'Gottschalk, S., Yigitbas, E., Schmidt, E., & Engels, G. (2020). Model-based
Product Configuration in Augmented Reality Applications. In R. Bernhaupt, C. Ardito,
& S. Sauer (Eds.), Human-Centered Software Engineering. HCSE 2020 (Vol.
12481). Cham: Springer. https://doi.org/10.1007/978-3-030-64266-2_5'
bibtex: '@inproceedings{Gottschalk_Yigitbas_Schmidt_Engels_2020, place={Cham}, series={Lecture
Notes in Computer Science}, title={Model-based Product Configuration in Augmented
Reality Applications}, volume={12481}, DOI={10.1007/978-3-030-64266-2_5},
booktitle={Human-Centered Software Engineering. HCSE 2020}, publisher={Springer},
author={Gottschalk, Sebastian and Yigitbas, Enes and Schmidt, Eugen and Engels,
Gregor}, editor={Bernhaupt, Regina and Ardito, Carmelo and Sauer, StefanEditors},
year={2020}, collection={Lecture Notes in Computer Science} }'
chicago: 'Gottschalk, Sebastian, Enes Yigitbas, Eugen Schmidt, and Gregor Engels.
“Model-Based Product Configuration in Augmented Reality Applications.” In Human-Centered
Software Engineering. HCSE 2020, edited by Regina Bernhaupt, Carmelo Ardito,
and Stefan Sauer, Vol. 12481. Lecture Notes in Computer Science. Cham: Springer,
2020. https://doi.org/10.1007/978-3-030-64266-2_5.'
ieee: S. Gottschalk, E. Yigitbas, E. Schmidt, and G. Engels, “Model-based Product
Configuration in Augmented Reality Applications,” in Human-Centered Software
Engineering. HCSE 2020, Eindhoven, 2020, vol. 12481.
mla: Gottschalk, Sebastian, et al. “Model-Based Product Configuration in Augmented
Reality Applications.” Human-Centered Software Engineering. HCSE 2020,
edited by Regina Bernhaupt et al., vol. 12481, Springer, 2020, doi:10.1007/978-3-030-64266-2_5.
short: 'S. Gottschalk, E. Yigitbas, E. Schmidt, G. Engels, in: R. Bernhaupt, C.
Ardito, S. Sauer (Eds.), Human-Centered Software Engineering. HCSE 2020, Springer,
Cham, 2020.'
conference:
end_date: 2020-12-02
location: Eindhoven
name: 8th International Working Conference on Human-Centered Software Engineering
(HCSE'20)
start_date: 2020-11-30
date_created: 2020-08-25T08:27:38Z
date_updated: 2022-01-06T06:53:28Z
ddc:
- '000'
department:
- _id: '66'
- _id: '534'
doi: 10.1007/978-3-030-64266-2_5
editor:
- first_name: Regina
full_name: Bernhaupt, Regina
last_name: Bernhaupt
- first_name: Carmelo
full_name: Ardito, Carmelo
last_name: Ardito
- first_name: Stefan
full_name: Sauer, Stefan
last_name: Sauer
file:
- access_level: open_access
content_type: application/pdf
creator: sego
date_created: 2020-11-30T08:33:30Z
date_updated: 2020-11-30T08:36:52Z
file_id: '20541'
file_name: HCSE20_full.pdf
file_size: 2258601
relation: main_file
file_date_updated: 2020-11-30T08:36:52Z
has_accepted_license: '1'
intvolume: ' 12481'
keyword:
- Product Configuration
- Augmented Reality
- Runtime Adaptation
- Dynamic Software Product Lines
language:
- iso: eng
oa: '1'
place: Cham
project:
- _id: '1'
name: SFB 901
- _id: '4'
name: SFB 901 - Project Area C
- _id: '17'
name: SFB 901 - Subproject C5
publication: Human-Centered Software Engineering. HCSE 2020
publication_status: published
publisher: Springer
series_title: Lecture Notes in Computer Science
status: public
title: Model-based Product Configuration in Augmented Reality Applications
type: conference
user_id: '47208'
volume: 12481
year: '2020'
...
---
_id: '16933'
abstract:
- lang: eng
text: The continuous innovation of its business models is an important task for
a company to stay competitive. During this process, the company has to validate
various hypotheses about its business models by adapting to uncertain and changing
customer needs effectively and efficiently. This adaptation, in turn, can be supported
by the concept of Software Product Lines (SPLs). SPLs reduce the time to market
by deriving products for customers with changing requirements using a common set
of features, structured as a feature model. Analogously, we support the process
of business model adaptation by applying the engineering process of SPLs to the
structure of the Business Model Canvas (BMC). We call this concept a Business
Model Decision Line (BMDL). The BMDL matches business domain knowledge in the
form of a feature model with customer needs to derive hypotheses about the business
model together with experiments for validation. Our approach is effective by providing
a comprehensive overview of possible business model adaptations and efficient
by reusing experiments for different hypotheses. We implement our approach in
a tool and illustrate the usefulness with an example of developing business models
for a mobile application.
author:
- first_name: Sebastian
full_name: Gottschalk, Sebastian
id: '47208'
last_name: Gottschalk
- first_name: Florian
full_name: Rittmeier, Florian
id: '5281'
last_name: Rittmeier
- first_name: Gregor
full_name: Engels, Gregor
id: '107'
last_name: Engels
citation:
ama: 'Gottschalk S, Rittmeier F, Engels G. Hypothesis-driven Adaptation of Business
Models based on Product Line Engineering. In: Proceedings of the 22nd IEEE
International Conference on Business Informatics. IEEE; 2020. doi:10.1109/CBI49978.2020.00022'
apa: 'Gottschalk, S., Rittmeier, F., & Engels, G. (2020). Hypothesis-driven
Adaptation of Business Models based on Product Line Engineering. In Proceedings
of the 22nd IEEE International Conference on Business Informatics. Antwerp:
IEEE. https://doi.org/10.1109/CBI49978.2020.00022'
bibtex: '@inproceedings{Gottschalk_Rittmeier_Engels_2020, title={Hypothesis-driven
Adaptation of Business Models based on Product Line Engineering}, DOI={10.1109/CBI49978.2020.00022},
booktitle={Proceedings of the 22nd IEEE International Conference on Business Informatics},
publisher={IEEE}, author={Gottschalk, Sebastian and Rittmeier, Florian and Engels,
Gregor}, year={2020} }'
chicago: Gottschalk, Sebastian, Florian Rittmeier, and Gregor Engels. “Hypothesis-Driven
Adaptation of Business Models Based on Product Line Engineering.” In Proceedings
of the 22nd IEEE International Conference on Business Informatics. IEEE, 2020.
https://doi.org/10.1109/CBI49978.2020.00022.
ieee: S. Gottschalk, F. Rittmeier, and G. Engels, “Hypothesis-driven Adaptation
of Business Models based on Product Line Engineering,” in Proceedings of the
22nd IEEE International Conference on Business Informatics, Antwerp, 2020.
mla: Gottschalk, Sebastian, et al. “Hypothesis-Driven Adaptation of Business Models
Based on Product Line Engineering.” Proceedings of the 22nd IEEE International
Conference on Business Informatics, IEEE, 2020, doi:10.1109/CBI49978.2020.00022.
short: 'S. Gottschalk, F. Rittmeier, G. Engels, in: Proceedings of the 22nd IEEE
International Conference on Business Informatics, IEEE, 2020.'
conference:
end_date: 2020-06-24
location: Antwerp
name: 22nd IEEE International Conference on Business Informatics
start_date: 2020-06-22
date_created: 2020-05-04T12:16:54Z
date_updated: 2022-01-06T06:52:59Z
ddc:
- '006'
department:
- _id: '66'
doi: 10.1109/CBI49978.2020.00022
file:
- access_level: open_access
content_type: application/pdf
creator: sego
date_created: 2020-07-14T09:33:00Z
date_updated: 2020-07-14T09:33:00Z
file_id: '17383'
file_name: CBI.pdf
file_size: 569290
relation: main_file
file_date_updated: 2020-07-14T09:33:00Z
has_accepted_license: '1'
keyword:
- Business Model Decision Line
- Business Model Adaptation
- Hypothesis-driven Adaptation
- Software Product Line
- Feature Model
language:
- iso: eng
oa: '1'
project:
- _id: '1'
name: SFB 901
- _id: '4'
name: SFB 901 - Project Area C
- _id: '17'
name: SFB 901 - Subproject C5
publication: Proceedings of the 22nd IEEE International Conference on Business Informatics
publisher: IEEE
status: public
title: Hypothesis-driven Adaptation of Business Models based on Product Line Engineering
type: conference
user_id: '47208'
year: '2020'
...
---
_id: '16934'
abstract:
- lang: eng
text: 'To build successful products, the developers have to adapt their product
features and business models to uncertain customer needs. This adaptation is part
of the research discipline of Hypotheses Engineering (HE) where customer needs
can be seen as hypotheses that need to be tested iteratively by conducting experiments
together with the customer. So far, modeling support and associated traceability
of this iterative process are missing. Both, in turn, are important to document
the adaptation to the customer needs and identify experiments that provide most
evidence to the customer needs. To target this issue, we introduce a model-based
HE approach with a twofold contribution: First, we develop a modeling language
that models hypotheses and experiments as interrelated hierarchies together with
a mapping between them. While the hypotheses are labeled with a score level of
their current evidence, the experiments are labeled with a score level of maximum
evidence that can be achieved during conduction. Second, we provide an iterative
process to determine experiments that offer the most evidence improvement to the
modeled hypotheses. We illustrate the usefulness of the approach with an example
of testing the business model of a mobile application.'
author:
- first_name: Sebastian
full_name: Gottschalk, Sebastian
id: '47208'
last_name: Gottschalk
- first_name: Enes
full_name: Yigitbas, Enes
id: '8447'
last_name: Yigitbas
orcid: 0000-0002-5967-833X
- first_name: Gregor
full_name: Engels, Gregor
id: '107'
last_name: Engels
citation:
ama: 'Gottschalk S, Yigitbas E, Engels G. Model-based Hypothesis Engineering for
Supporting Adaptation to Uncertain Customer Needs. In: Shishkov B, ed. Business
Modeling and Software Design. Vol 391. Lecture Notes in Business Information
Processing. Springer International Publishing; 2020:276-286. doi:10.1007/978-3-030-52306-0_18'
apa: 'Gottschalk, S., Yigitbas, E., & Engels, G. (2020). Model-based Hypothesis
Engineering for Supporting Adaptation to Uncertain Customer Needs. In B. Shishkov
(Ed.), Business Modeling and Software Design (Vol. 391, pp. 276–286). Potsdam:
Springer International Publishing. https://doi.org/10.1007/978-3-030-52306-0_18'
bibtex: '@inproceedings{Gottschalk_Yigitbas_Engels_2020, series={Lecture Notes in
Business Information Processing}, title={Model-based Hypothesis Engineering for
Supporting Adaptation to Uncertain Customer Needs}, volume={391}, DOI={10.1007/978-3-030-52306-0_18},
booktitle={Business Modeling and Software Design}, publisher={Springer International
Publishing}, author={Gottschalk, Sebastian and Yigitbas, Enes and Engels, Gregor},
editor={Shishkov, BorisEditor}, year={2020}, pages={276–286}, collection={Lecture
Notes in Business Information Processing} }'
chicago: Gottschalk, Sebastian, Enes Yigitbas, and Gregor Engels. “Model-Based Hypothesis
Engineering for Supporting Adaptation to Uncertain Customer Needs.” In Business
Modeling and Software Design, edited by Boris Shishkov, 391:276–86. Lecture
Notes in Business Information Processing. Springer International Publishing, 2020.
https://doi.org/10.1007/978-3-030-52306-0_18.
ieee: S. Gottschalk, E. Yigitbas, and G. Engels, “Model-based Hypothesis Engineering
for Supporting Adaptation to Uncertain Customer Needs,” in Business Modeling
and Software Design, Potsdam, 2020, vol. 391, pp. 276–286.
mla: Gottschalk, Sebastian, et al. “Model-Based Hypothesis Engineering for Supporting
Adaptation to Uncertain Customer Needs.” Business Modeling and Software Design,
edited by Boris Shishkov, vol. 391, Springer International Publishing, 2020, pp.
276–86, doi:10.1007/978-3-030-52306-0_18.
short: 'S. Gottschalk, E. Yigitbas, G. Engels, in: B. Shishkov (Ed.), Business Modeling
and Software Design, Springer International Publishing, 2020, pp. 276–286.'
conference:
end_date: 2020-07-08
location: Potsdam
name: '10th International Symposium on Business Modeling and Software Design '
start_date: 2020-07-06
date_created: 2020-05-04T12:27:38Z
date_updated: 2022-01-06T06:52:59Z
ddc:
- '006'
department:
- _id: '66'
doi: 10.1007/978-3-030-52306-0_18
editor:
- first_name: Boris
full_name: Shishkov, Boris
last_name: Shishkov
file:
- access_level: open_access
content_type: application/pdf
creator: sego
date_created: 2020-07-14T09:25:30Z
date_updated: 2020-07-14T09:28:33Z
file_id: '17380'
file_name: BMSD20.pdf
file_size: 267658
relation: main_file
file_date_updated: 2020-07-14T09:28:33Z
has_accepted_license: '1'
intvolume: ' 391'
keyword:
- Hypothesis Engineering
- Model-based
- Customer Need Adaptation
- Business Model
- Product Features
language:
- iso: eng
oa: '1'
page: 276-286
project:
- _id: '1'
name: SFB 901
- _id: '4'
name: SFB 901 - Project Area C
- _id: '17'
name: SFB 901 - Subproject C5
publication: Business Modeling and Software Design
publisher: Springer International Publishing
series_title: Lecture Notes in Business Information Processing
status: public
title: Model-based Hypothesis Engineering for Supporting Adaptation to Uncertain Customer
Needs
type: conference
user_id: '47208'
volume: 391
year: '2020'
...
---
_id: '20143'
author:
- first_name: Mortaza
full_name: Otroshi, Mortaza
id: '71269'
last_name: Otroshi
orcid: 0000-0002-8652-9209
- first_name: Moritz
full_name: Rossel, Moritz
last_name: Rossel
- first_name: Gerson
full_name: Meschut, Gerson
id: '32056'
last_name: Meschut
orcid: 0000-0002-2763-1246
citation:
ama: Otroshi M, Rossel M, Meschut G. Stress state dependent damage modeling of self-pierce
riveting process simulation using GISSMO damage model. Journal of Advanced
Joining Processes. 2020;1. doi:10.1016/j.jajp.2020.100015
apa: Otroshi, M., Rossel, M., & Meschut, G. (2020). Stress state dependent damage
modeling of self-pierce riveting process simulation using GISSMO damage model.
Journal of Advanced Joining Processes, 1. https://doi.org/10.1016/j.jajp.2020.100015
bibtex: '@article{Otroshi_Rossel_Meschut_2020, title={Stress state dependent damage
modeling of self-pierce riveting process simulation using GISSMO damage model},
volume={1}, DOI={10.1016/j.jajp.2020.100015},
journal={Journal of Advanced Joining Processes}, publisher={Elsevier}, author={Otroshi,
Mortaza and Rossel, Moritz and Meschut, Gerson}, year={2020} }'
chicago: Otroshi, Mortaza, Moritz Rossel, and Gerson Meschut. “Stress State Dependent
Damage Modeling of Self-Pierce Riveting Process Simulation Using GISSMO Damage
Model.” Journal of Advanced Joining Processes 1 (2020). https://doi.org/10.1016/j.jajp.2020.100015.
ieee: 'M. Otroshi, M. Rossel, and G. Meschut, “Stress state dependent damage modeling
of self-pierce riveting process simulation using GISSMO damage model,” Journal
of Advanced Joining Processes, vol. 1, 2020, doi: 10.1016/j.jajp.2020.100015.'
mla: Otroshi, Mortaza, et al. “Stress State Dependent Damage Modeling of Self-Pierce
Riveting Process Simulation Using GISSMO Damage Model.” Journal of Advanced
Joining Processes, vol. 1, Elsevier, 2020, doi:10.1016/j.jajp.2020.100015.
short: M. Otroshi, M. Rossel, G. Meschut, Journal of Advanced Joining Processes
1 (2020).
date_created: 2020-10-20T14:49:15Z
date_updated: 2022-04-25T07:49:50Z
department:
- _id: '157'
doi: 10.1016/j.jajp.2020.100015
intvolume: ' 1'
keyword:
- Self-pierce riveting
- Ductile fracture
- Damage modeling
- GISSMO damage model
language:
- iso: eng
main_file_link:
- open_access: '1'
oa: '1'
publication: Journal of Advanced Joining Processes
publisher: Elsevier
quality_controlled: '1'
status: public
title: Stress state dependent damage modeling of self-pierce riveting process simulation
using GISSMO damage model
type: journal_article
user_id: '71269'
volume: 1
year: '2020'
...
---
_id: '35298'
abstract:
- lang: ger
text: Im Artikel werden drei verschiedene Lernzugänge (kom-petenzorientiertes, ästhetisches und biographisches Lernen) vorgestellt und aus
theoretischer Perspektive deren motivierender Gehalt für selbstreguliertes Lernen
in Praxisphasen des Lehramtsstudiumsherausgearbeitet. Als theoretische Grund-lage
dient die Selbstbestimmungstheorie als zentrale motivationale Theorie zur Erklärung
selbstbestimmten Handelns.
- lang: eng
text: The article addresses how motivational learning approaches (competency-oriented, aesthetic and biographical) can contribute to the professionalization
of preservice teachers during a long-term internship. As a theoretical basis,
the self-determination theory serves as a central motivational theory for explaining
self-determined action.
alternative_title:
- Ein Blick auf kompetenzorientiertes, ästhetisches und biographisches Lernen im Lehramtsstudium
author:
- first_name: Carina
full_name: Caruso, Carina
id: '23123'
last_name: Caruso
- first_name: Christine
full_name: Adammek, Christine
last_name: Adammek
- first_name: Sabrina
full_name: Bonanati, Sabrina
last_name: Bonanati
- first_name: Sybille
full_name: Wiescholek, Sybille
last_name: Wiescholek
citation:
ama: Caruso C, Adammek C, Bonanati S, Wiescholek S. Motivierende Lernzugänge als
Ausgangspunkt der Professionalisierung angehender Lehrer_innen. Herausforderung
Lehrer*innenbildung - Zeitschrift Zur Konzeption, Gestaltung Und Diskussion.
2020;3(1):18-33. doi:10.4119/hlz-2540
apa: Caruso, C., Adammek, C., Bonanati, S., & Wiescholek, S. (2020). Motivierende
Lernzugänge als Ausgangspunkt der Professionalisierung angehender Lehrer_innen.
Herausforderung Lehrer*innenbildung - Zeitschrift Zur Konzeption, Gestaltung
Und Diskussion, 3(1), 18–33. https://doi.org/10.4119/hlz-2540
bibtex: '@article{Caruso_Adammek_Bonanati_Wiescholek_2020, title={Motivierende Lernzugänge
als Ausgangspunkt der Professionalisierung angehender Lehrer_innen}, volume={3},
DOI={10.4119/hlz-2540}, number={1},
journal={Herausforderung Lehrer*innenbildung - Zeitschrift Zur Konzeption, Gestaltung
Und Diskussion}, author={Caruso, Carina and Adammek, Christine and Bonanati, Sabrina
and Wiescholek, Sybille}, year={2020}, pages={18–33} }'
chicago: 'Caruso, Carina, Christine Adammek, Sabrina Bonanati, and Sybille Wiescholek.
“Motivierende Lernzugänge als Ausgangspunkt der Professionalisierung angehender
Lehrer_innen.” Herausforderung Lehrer*innenbildung - Zeitschrift Zur Konzeption,
Gestaltung Und Diskussion 3, no. 1 (2020): 18–33. https://doi.org/10.4119/hlz-2540.'
ieee: 'C. Caruso, C. Adammek, S. Bonanati, and S. Wiescholek, “Motivierende Lernzugänge
als Ausgangspunkt der Professionalisierung angehender Lehrer_innen,” Herausforderung
Lehrer*innenbildung - Zeitschrift Zur Konzeption, Gestaltung Und Diskussion,
vol. 3, no. 1, pp. 18–33, 2020, doi: 10.4119/hlz-2540.'
mla: Caruso, Carina, et al. “Motivierende Lernzugänge als Ausgangspunkt der Professionalisierung
angehender Lehrer_innen.” Herausforderung Lehrer*innenbildung - Zeitschrift
Zur Konzeption, Gestaltung Und Diskussion, vol. 3, no. 1, 2020, pp. 18–33,
doi:10.4119/hlz-2540.
short: C. Caruso, C. Adammek, S. Bonanati, S. Wiescholek, Herausforderung Lehrer*innenbildung
- Zeitschrift Zur Konzeption, Gestaltung Und Diskussion 3 (2020) 18–33.
date_created: 2023-01-05T13:58:28Z
date_updated: 2023-01-06T12:18:16Z
doi: 10.4119/hlz-2540
intvolume: ' 3'
issue: '1'
keyword:
- ästhetische Forschung
- Biographiearbeit
- Praxissemester
- Professionalisierung
- selbstreguliertes Lernen
- Motivation / aesthetic research
- biographical work
- long-term internship
- profes-sionalization
- self-regulated learning
- motivation
language:
- iso: other
page: 18-33
publication: Herausforderung Lehrer*innenbildung - Zeitschrift Zur Konzeption, Gestaltung
Und Diskussion
publication_identifier:
issn:
- 2625-0675
publication_status: published
status: public
title: Motivierende Lernzugänge als Ausgangspunkt der Professionalisierung angehender
Lehrer_innen
type: journal_article
user_id: '86519'
volume: 3
year: '2020'
...
---
_id: '19976'
abstract:
- lang: eng
text: The aim to reduce pollutant emission has led to a trend towards lightweight
construction in car body development during the last years. As a consequence of
the resulting need for multi-material design, mechanical joining technologies
become increasingly important. Mechanical joining allows for the combination of
dissimilar materials, while thermic joining techniques reach their limits. Self-piercing
riveting enables the joining of dissimilar materials by using semi-tubular rivets
as mechanical fasteners. The rivet production, however, is costly and time-consuming,
as the rivets generally have to be hardened, tempered and coated after forming,
in order to achieve an adequate strength and corrosion resistance. A promising
approach to improve the efficiency of the rivet manufacturing is the use of high-strength
high nitrogen steel as rivet material because these additional process steps would
not be necessary anymore. As a result of the comparatively high nitrogen content,
such steels have various beneficial properties like higher strength, good ductility
and improved corrosion resistance. By cold bulk forming of high nitrogen steels
high-strength parts can be manufactured due to the strengthening which is caused
by the high strain hardening. However, high tool loads thereby have to be expected
and are a major challenge during the production process. Consequently, there is
a need for appropriate forming strategies. This paper presents key aspects concerning
the process design for the manufacturing of semi-tubular self-piercing rivets
made of high-strength steel. The aim is to produce the rivets in several forming
stages without intermediate heat treatment between the single stages. Due to the
high strain hardening of the material, a two stage forming concept will be investigated.
Cup-backward extrusion is chosen as the first process step in order to form the
rivet shank without forming the rivet foot. Thus, the strain hardening effects
in the area of the rivet foot are minimized and the tool loads during the following
process step can be reduced. During the second and final forming stage the detailed
geometry of the rivet foot and the rivet head is formed. In this context, the
effect of different variations, for example concerning the final geometry of the
rivet foot, on the tool load is investigated using multistage numerical analysis.
Furthermore, the influence of the process temperature on occurring stresses is
analysed. Based on the results of the investigations, an adequate forming strategy
and a tool concept for the manufacturing of semi-tubular self-piercing rivets
made of high-strength steel are presented.
citation:
ama: Kuball C-M, Uhe B, Meschut G, Merklein M, eds. Process Design for the Forming
of Semi-Tubular Self-Piercing Rivets Made of High Nitrogen Steel. Vol 50.;
2020:280-285. doi:10.1016/j.promfg.2020.08.052
apa: Kuball, C.-M., Uhe, B., Meschut, G., & Merklein, M. (Eds.). (2020). Process
design for the forming of semi-tubular self-piercing rivets made of high nitrogen
steel (Vol. 50, pp. 280–285). https://doi.org/10.1016/j.promfg.2020.08.052
bibtex: '@book{Kuball_Uhe_Meschut_Merklein_2020, series={Procedia Manufacturing},
title={Process design for the forming of semi-tubular self-piercing rivets made
of high nitrogen steel}, volume={50}, DOI={10.1016/j.promfg.2020.08.052},
year={2020}, pages={280–285}, collection={Procedia Manufacturing} }'
chicago: Kuball, Clara-Maria, Benedikt Uhe, Gerson Meschut, and Marion Merklein,
eds. Process Design for the Forming of Semi-Tubular Self-Piercing Rivets Made
of High Nitrogen Steel. Vol. 50. Procedia Manufacturing, 2020. https://doi.org/10.1016/j.promfg.2020.08.052.
ieee: C.-M. Kuball, B. Uhe, G. Meschut, and M. Merklein, Eds., Process design
for the forming of semi-tubular self-piercing rivets made of high nitrogen steel,
vol. 50. 2020, pp. 280–285.
mla: Kuball, Clara-Maria, et al., editors. Process Design for the Forming of
Semi-Tubular Self-Piercing Rivets Made of High Nitrogen Steel. 2020, pp. 280–85,
doi:10.1016/j.promfg.2020.08.052.
short: C.-M. Kuball, B. Uhe, G. Meschut, M. Merklein, eds., Process Design for the
Forming of Semi-Tubular Self-Piercing Rivets Made of High Nitrogen Steel, 2020.
date_created: 2020-10-12T08:30:08Z
date_updated: 2026-02-27T10:43:48Z
department:
- _id: '157'
doi: 10.1016/j.promfg.2020.08.052
editor:
- first_name: Clara-Maria
full_name: Kuball, Clara-Maria
last_name: Kuball
- first_name: Benedikt
full_name: Uhe, Benedikt
id: '38131'
last_name: Uhe
- first_name: Gerson
full_name: Meschut, Gerson
id: '32056'
last_name: Meschut
orcid: 0000-0002-2763-1246
- first_name: Marion
full_name: Merklein, Marion
last_name: Merklein
intvolume: ' 50'
keyword:
- high nitrogen steel
- self-piercing riveting
- joining by forming
- bulk forming
- tool design
language:
- iso: eng
page: 280-285
publication_status: published
quality_controlled: '1'
series_title: Procedia Manufacturing
status: public
title: Process design for the forming of semi-tubular self-piercing rivets made of
high nitrogen steel
type: conference_editor
user_id: '53912'
volume: 50
year: '2020'
...
---
_id: '19973'
abstract:
- lang: eng
text: As a result of lightweight design, increased use is being made of high-strength
steel and aluminium in car bodies. Self-piercing riveting is an established technique
for joining these materials. The dissimilar properties of the two materials have
led to a number of different rivet geometries in the past. Each rivet geometry
fulfils the requirements of the materials within a limited range. In the present
investigation, an improved rivet geometry is developed, which permits the reliable
joining of two material combinations that could only be joined by two different
rivet geometries up until now. Material combination 1 consists of high-strength
steel on both sides, while material combination 2 comprises aluminium on the punch
side and high-strength steel on the die side. The material flow and the stress
and strain conditions prevailing during the joining process are analysed by means
of numerical simulation. The rivet geometry is then improved step-by-step on the
basis of this analysis. Finally, the improved rivet geometry is manufactured and
the findings of the investigation are verified in experimental joining tests.
article_type: original
author:
- first_name: Benedikt
full_name: Uhe, Benedikt
id: '38131'
last_name: Uhe
- first_name: Clara-Maria
full_name: Kuball, Clara-Maria
last_name: Kuball
- first_name: Marion
full_name: Merklein, Marion
last_name: Merklein
- first_name: Gerson
full_name: Meschut, Gerson
id: '32056'
last_name: Meschut
orcid: 0000-0002-2763-1246
citation:
ama: Uhe B, Kuball C-M, Merklein M, Meschut G. Improvement of a rivet geometry for
the self-piercing riveting of high-strength steel and multi-material joints. Production
Engineering. 2020;14:417-423. doi:10.1007/s11740-020-00973-w
apa: Uhe, B., Kuball, C.-M., Merklein, M., & Meschut, G. (2020). Improvement
of a rivet geometry for the self-piercing riveting of high-strength steel and
multi-material joints. Production Engineering, 14, 417–423. https://doi.org/10.1007/s11740-020-00973-w
bibtex: '@article{Uhe_Kuball_Merklein_Meschut_2020, title={Improvement of a rivet
geometry for the self-piercing riveting of high-strength steel and multi-material
joints}, volume={14}, DOI={10.1007/s11740-020-00973-w},
journal={Production Engineering}, author={Uhe, Benedikt and Kuball, Clara-Maria
and Merklein, Marion and Meschut, Gerson}, year={2020}, pages={417–423} }'
chicago: 'Uhe, Benedikt, Clara-Maria Kuball, Marion Merklein, and Gerson Meschut.
“Improvement of a Rivet Geometry for the Self-Piercing Riveting of High-Strength
Steel and Multi-Material Joints.” Production Engineering 14 (2020): 417–23.
https://doi.org/10.1007/s11740-020-00973-w.'
ieee: 'B. Uhe, C.-M. Kuball, M. Merklein, and G. Meschut, “Improvement of a rivet
geometry for the self-piercing riveting of high-strength steel and multi-material
joints,” Production Engineering, vol. 14, pp. 417–423, 2020, doi: 10.1007/s11740-020-00973-w.'
mla: Uhe, Benedikt, et al. “Improvement of a Rivet Geometry for the Self-Piercing
Riveting of High-Strength Steel and Multi-Material Joints.” Production Engineering,
vol. 14, 2020, pp. 417–23, doi:10.1007/s11740-020-00973-w.
short: B. Uhe, C.-M. Kuball, M. Merklein, G. Meschut, Production Engineering 14
(2020) 417–423.
date_created: 2020-10-12T08:14:13Z
date_updated: 2026-02-27T10:41:55Z
department:
- _id: '157'
doi: 10.1007/s11740-020-00973-w
intvolume: ' 14'
keyword:
- Self-piercing riveting
- Joining technology
- Rivet geometry
- Multi-material design
- High-strength steel
- Aluminium
language:
- iso: eng
page: 417-423
publication: Production Engineering
publication_status: published
quality_controlled: '1'
status: public
title: Improvement of a rivet geometry for the self-piercing riveting of high-strength
steel and multi-material joints
type: journal_article
user_id: '53912'
volume: 14
year: '2020'
...
---
_id: '19974'
abstract:
- lang: eng
text: Due to the trend towards lightweight design in car body development mechanical
joining technologies become increasingly important. These techniques allow for
the joining of dissimilar materials and thus enable multi-material design, while
thermic joining methods reach their limits. Semi-tubular self-piercing riveting
is an important mechanical joining technology. The rivet production, however,
is costly and time-consuming, as the process consists of several process steps
including the heat treatment and coating of the rivets in order to achieve an
adequate strength and corrosion resistance. The use of high nitrogen steel as
rivet material leads to the possibility of reducing process steps and hence increasing
the efficiency of the process. However, the high tool loads being expected due
to the high strain hardening of the material are a major challenge during the
rivet production. Thus, there is a need for appropriate forming strategies, such
as the manufacturing of the rivets at elevated temperatures. Prior investigations
led to the conclusion that forming already at 200 °C results in a distinct reduction
of the yield strength. To create a deeper understanding of the forming behaviour
of high nitrogen steel at elevated temperatures, compression tests were conducted
in a temperature range between room temperature and 200 °C. The determined true
stress – true strain curves are the basis for the further process and tool design
of the rivet production. Another key factor for the rivet manufacturing at elevated
temperatures is the influence of the process temperature on the tribological conditions.
For this reason, ring compression tests at room temperature and 200 °C are carried
out. The friction factors are determined on the basis of calibration curves resulting
from the numerical analysis of the ring compression process. The investigations
indicate that the friction factor at 200 °C is significantly higher compared to
room temperature. This essential fact has to be taken into account for the process
and tool design for the rivet production using high nitrogen steel.
article_number: '100023'
citation:
ama: Kuball C-M, Jung R, Uhe B, Meschut G, Merklein M, eds. Influence of the
Process Temperature on the Forming Behaviour and the Friction during Bulk Forming
of High Nitrogen Steel. Vol 1.; 2020. doi:10.1016/j.jajp.2020.100023
apa: Kuball, C.-M., Jung, R., Uhe, B., Meschut, G., & Merklein, M. (Eds.). (2020).
Influence of the process temperature on the forming behaviour and the friction
during bulk forming of high nitrogen steel (No. 100023; Vol. 1). https://doi.org/10.1016/j.jajp.2020.100023
bibtex: '@book{Kuball_Jung_Uhe_Meschut_Merklein_2020, series={Journal of Advanced
Joining Processes}, title={Influence of the process temperature on the forming
behaviour and the friction during bulk forming of high nitrogen steel}, volume={1},
DOI={10.1016/j.jajp.2020.100023},
number={100023}, year={2020}, collection={Journal of Advanced Joining Processes}
}'
chicago: Kuball, Clara-Maria, R Jung, Benedikt Uhe, Gerson Meschut, and Marion Merklein,
eds. Influence of the Process Temperature on the Forming Behaviour and the
Friction during Bulk Forming of High Nitrogen Steel. Vol. 1. Journal of Advanced
Joining Processes, 2020. https://doi.org/10.1016/j.jajp.2020.100023.
ieee: C.-M. Kuball, R. Jung, B. Uhe, G. Meschut, and M. Merklein, Eds., Influence
of the process temperature on the forming behaviour and the friction during bulk
forming of high nitrogen steel, vol. 1. 2020.
mla: Kuball, Clara-Maria, et al., editors. Influence of the Process Temperature
on the Forming Behaviour and the Friction during Bulk Forming of High Nitrogen
Steel. 100023, 2020, doi:10.1016/j.jajp.2020.100023.
short: C.-M. Kuball, R. Jung, B. Uhe, G. Meschut, M. Merklein, eds., Influence of
the Process Temperature on the Forming Behaviour and the Friction during Bulk
Forming of High Nitrogen Steel, 2020.
date_created: 2020-10-12T08:23:27Z
date_updated: 2026-02-27T10:45:08Z
department:
- _id: '157'
doi: 10.1016/j.jajp.2020.100023
editor:
- first_name: Clara-Maria
full_name: Kuball, Clara-Maria
last_name: Kuball
- first_name: R
full_name: Jung, R
last_name: Jung
- first_name: Benedikt
full_name: Uhe, Benedikt
id: '38131'
last_name: Uhe
- first_name: Gerson
full_name: Meschut, Gerson
id: '32056'
last_name: Meschut
orcid: 0000-0002-2763-1246
- first_name: Marion
full_name: Merklein, Marion
last_name: Merklein
intvolume: ' 1'
keyword:
- High nitrogen steel
- Self-piercing riveting
- Joining by forming
- Bulk forming
- Strain hardening
language:
- iso: eng
publication_status: published
quality_controlled: '1'
series_title: Journal of Advanced Joining Processes
status: public
title: Influence of the process temperature on the forming behaviour and the friction
during bulk forming of high nitrogen steel
type: conference_editor
user_id: '53912'
volume: 1
year: '2020'
...
---
_id: '10000'
abstract:
- lang: eng
text: Ultraschall wird zur Effizienzsteigerung in verfahrenstechnischen Prozessen
eingesetzt. Die Betriebsparamter der Ultraschallsysteme werden empirisch ermittelt,
da derzeit keine systematische Analyse der Wechselwirkung zwischen Ultraschallwandler
und Schallfeld sowie kein Verfahren zur Messung der Kavitationsaktivität ohne
zusätzlichen Sensor existieren. Auf Basis einer experimentellen Analyse des betrachteten
sonochemischen Reaktors wird ein Finite-Elemente-Modell aufgebaut, das die Wechselwirkung
zwischen Schallfeld und Ultraschallwandler berücksichtigt. Die modellbasierte
Analyse zeigt, dass wegen der akustischen Eigenschaften des Autoklavs nur direkt
an der Sonotrode Kavitation entsteht. Die Wechselwirkung zwischen Ultraschallwandler
und Schallfeld ermöglicht Aussagen über das Schallfeld und die Kavitationsaktivität
auf Basis der Rückwirkung auf den Ultraschallwandler. Die lineare Schalldruckverteilung
ermöglicht eine Prognose über die Verteilung von Kavitationszonen. Das beschriebene
Modell liefert wertvolle Erkenntnisse für die Auslegung, Analyse und Skalierung
sonochemischer Reaktoren. Auf Grund der rauen Prozessrandbedingungen ist die Applikation
von Sensoren zur Überwachung der Kavitationsaktivität in vielen sonochemischen
Prozessen nicht möglich. Zur prozessbegleitenden Messung der Kavitationsaktivität
wird ein Verfahren entwickelt, das die Bewertung der Kavitationsaktivität durch
Auswertung der Rückwirkung auf den Ultraschallwandler erlaubt. Das Messverfahren
ermöglicht eine vorhersagbare und reproduzierbare Durchführung kavitationsbasierter
Prozesse und stellt eine wichtige Erweiterung für bestehende und neue Ultraschallsysteme
dar.
author:
- first_name: Peter
full_name: Bornmann, Peter
last_name: Bornmann
citation:
ama: Bornmann P. Modellierung Und Experimentelle Charakterisierung Der Wechselwirkung
Zwischen Ultraschallwandler Und Flüssigkeit in Kavitationsbasierten Prozessen.
Shaker; 2019.
apa: Bornmann, P. (2019). Modellierung und experimentelle Charakterisierung der
Wechselwirkung zwischen Ultraschallwandler und Flüssigkeit in kavitationsbasierten
Prozessen. Shaker.
bibtex: '@book{Bornmann_2019, title={Modellierung und experimentelle Charakterisierung
der Wechselwirkung zwischen Ultraschallwandler und Flüssigkeit in kavitationsbasierten
Prozessen}, publisher={Shaker}, author={Bornmann, Peter}, year={2019} }'
chicago: Bornmann, Peter. Modellierung Und Experimentelle Charakterisierung Der
Wechselwirkung Zwischen Ultraschallwandler Und Flüssigkeit in Kavitationsbasierten
Prozessen. Shaker, 2019.
ieee: P. Bornmann, Modellierung und experimentelle Charakterisierung der Wechselwirkung
zwischen Ultraschallwandler und Flüssigkeit in kavitationsbasierten Prozessen.
Shaker, 2019.
mla: Bornmann, Peter. Modellierung Und Experimentelle Charakterisierung Der Wechselwirkung
Zwischen Ultraschallwandler Und Flüssigkeit in Kavitationsbasierten Prozessen.
Shaker, 2019.
short: P. Bornmann, Modellierung Und Experimentelle Charakterisierung Der Wechselwirkung
Zwischen Ultraschallwandler Und Flüssigkeit in Kavitationsbasierten Prozessen,
Shaker, 2019.
date_created: 2019-05-27T10:29:53Z
date_updated: 2023-09-15T12:23:55Z
department:
- _id: '151'
keyword:
- Sonochemie
- Akustische Kavitation
- Kavitationsmessung
- Kavitationsdetektion
- FEM-Simulation Ultraschallwandler
- Prozessüberwachung
- FEM-Simulation Schallfeld
- Self-Sensing
- Piezoelektrische Ultraschallwandler
- Ultraschallreinigung
language:
- iso: eng
publisher: Shaker
status: public
title: Modellierung und experimentelle Charakterisierung der Wechselwirkung zwischen
Ultraschallwandler und Flüssigkeit in kavitationsbasierten Prozessen
type: dissertation
user_id: '210'
year: '2019'
...
---
_id: '1163'
abstract:
- lang: eng
text: "In this paper we present two major results:\r\nFirst, we introduce the first
self-stabilizing version of a supervised overlay network (as introduced in~\\cite{DBLP:conf/ispan/KothapalliS05})
by presenting a self-stabilizing supervised skip ring.\r\nSecondly, we show how
to use the self-stabilizing supervised skip ring to construct an efficient self-stabilizing
publish-subscribe system.\r\nThat is, in addition to stabilizing the overlay network,
every subscriber of a topic will eventually know all of the publications that
have been issued so far for that topic. The communication work needed to processes
a subscribe or unsubscribe operation is just a constant in a legitimate state,
and the communication work of checking whether the system is still in a legitimate
state is just a constant on expectation for the supervisor as well as any process
in the system.\r\n"
author:
- first_name: Michael
full_name: Feldmann, Michael
id: '23538'
last_name: Feldmann
- first_name: Christina
full_name: Kolb, Christina
id: '43647'
last_name: Kolb
- first_name: Christian
full_name: Scheideler, Christian
id: '20792'
last_name: Scheideler
- first_name: Thim Frederik
full_name: Strothmann, Thim Frederik
id: '11319'
last_name: Strothmann
citation:
ama: 'Feldmann M, Kolb C, Scheideler C, Strothmann TF. Self-Stabilizing Supervised
Publish-Subscribe Systems. In: Proceedings of the 32nd IEEE International Parallel
& Distributed Processing Symposium (IPDPS). IEEE; 2018. doi:10.1109/IPDPS.2018.00114'
apa: 'Feldmann, M., Kolb, C., Scheideler, C., & Strothmann, T. F. (2018). Self-Stabilizing
Supervised Publish-Subscribe Systems. In Proceedings of the 32nd IEEE International
Parallel & Distributed Processing Symposium (IPDPS). Vancouver: IEEE.
https://doi.org/10.1109/IPDPS.2018.00114'
bibtex: '@inproceedings{Feldmann_Kolb_Scheideler_Strothmann_2018, title={Self-Stabilizing
Supervised Publish-Subscribe Systems}, DOI={10.1109/IPDPS.2018.00114},
booktitle={Proceedings of the 32nd IEEE International Parallel & Distributed
Processing Symposium (IPDPS)}, publisher={IEEE}, author={Feldmann, Michael and
Kolb, Christina and Scheideler, Christian and Strothmann, Thim Frederik}, year={2018}
}'
chicago: Feldmann, Michael, Christina Kolb, Christian Scheideler, and Thim Frederik
Strothmann. “Self-Stabilizing Supervised Publish-Subscribe Systems.” In Proceedings
of the 32nd IEEE International Parallel & Distributed Processing Symposium
(IPDPS). IEEE, 2018. https://doi.org/10.1109/IPDPS.2018.00114.
ieee: M. Feldmann, C. Kolb, C. Scheideler, and T. F. Strothmann, “Self-Stabilizing
Supervised Publish-Subscribe Systems,” in Proceedings of the 32nd IEEE International
Parallel & Distributed Processing Symposium (IPDPS), Vancouver, 2018.
mla: Feldmann, Michael, et al. “Self-Stabilizing Supervised Publish-Subscribe Systems.”
Proceedings of the 32nd IEEE International Parallel & Distributed Processing
Symposium (IPDPS), IEEE, 2018, doi:10.1109/IPDPS.2018.00114.
short: 'M. Feldmann, C. Kolb, C. Scheideler, T.F. Strothmann, in: Proceedings of
the 32nd IEEE International Parallel & Distributed Processing Symposium (IPDPS),
IEEE, 2018.'
conference:
end_date: 2018-5-24
location: Vancouver
name: 32nd IEEE International Parallel & Distributed Processing Symposium (IPDPS)
start_date: 2018-5-22
date_created: 2018-02-01T13:56:01Z
date_updated: 2022-01-06T06:51:05Z
ddc:
- '040'
department:
- _id: '79'
- _id: '66'
doi: 10.1109/IPDPS.2018.00114
external_id:
arxiv:
- '1710.08128'
file:
- access_level: closed
content_type: application/pdf
creator: mfeldma2
date_created: 2018-10-31T13:25:37Z
date_updated: 2018-10-31T13:25:37Z
file_id: '5211'
file_name: 08425258.pdf
file_size: 239559
relation: main_file
success: 1
file_date_updated: 2018-10-31T13:25:37Z
has_accepted_license: '1'
keyword:
- Topological Self-stabilization
- Supervised Overlay
- Publish-Subscribe System
language:
- iso: eng
project:
- _id: '1'
name: SFB 901
- _id: '2'
name: SFB 901 - Project Area A
- _id: '5'
name: SFB 901 - Subproject A1
publication: Proceedings of the 32nd IEEE International Parallel & Distributed Processing
Symposium (IPDPS)
publisher: IEEE
status: public
title: Self-Stabilizing Supervised Publish-Subscribe Systems
type: conference
user_id: '11319'
year: '2018'
...
---
_id: '4411'
abstract:
- lang: eng
text: "While a lot of research in distributed computing has covered solutions for
self-stabilizing computing and topologies, there is far less work on self-stabilization
for distributed data structures.\r\nConsidering crashing peers in peer-to-peer
networks, it should not be taken for granted that a distributed data structure
remains intact.\r\nIn this work, we present a self-stabilizing protocol for a
distributed data structure called the hashed Patricia Trie (Kniesburges and Scheideler
WALCOM'11) that enables efficient prefix search on a set of keys.\r\nThe data
structure has a wide area of applications including string matching problems while
offering low overhead and efficient operations when embedded on top of a distributed
hash table.\r\nEspecially, longest prefix matching for $x$ can be done in $\\mathcal{O}(\\log
|x|)$ hash table read accesses.\r\nWe show how to maintain the structure in a
self-stabilizing way.\r\nOur protocol assures low overhead in a legal state and
a total (asymptotically optimal) memory demand of $\\Theta(d)$ bits, where $d$
is the number of bits needed for storing all keys."
author:
- first_name: Till
full_name: Knollmann, Till
id: '39241'
last_name: Knollmann
orcid: 0000-0003-2014-4696
- first_name: Christian
full_name: Scheideler, Christian
id: '20792'
last_name: Scheideler
citation:
ama: 'Knollmann T, Scheideler C. A Self-Stabilizing Hashed Patricia Trie. In: Izumi
T, Kuznetsov P, eds. Proceedings of the 20th International Symposium on Stabilization,
Safety, and Security of Distributed Systems (SSS). Vol 11201. Lecture Notes
of Computer Science. Springer, Cham; 2018. doi:10.1007/978-3-030-03232-6_1'
apa: 'Knollmann, T., & Scheideler, C. (2018). A Self-Stabilizing Hashed Patricia
Trie. In T. Izumi & P. Kuznetsov (Eds.), Proceedings of the 20th International
Symposium on Stabilization, Safety, and Security of Distributed Systems (SSS)
(Vol. 11201). Tokyo: Springer, Cham. https://doi.org/10.1007/978-3-030-03232-6_1'
bibtex: '@inproceedings{Knollmann_Scheideler_2018, series={Lecture Notes of Computer
Science}, title={A Self-Stabilizing Hashed Patricia Trie}, volume={11201}, DOI={10.1007/978-3-030-03232-6_1},
booktitle={Proceedings of the 20th International Symposium on Stabilization, Safety,
and Security of Distributed Systems (SSS)}, publisher={Springer, Cham}, author={Knollmann,
Till and Scheideler, Christian}, editor={Izumi, Taisuke and Kuznetsov, PetrEditors},
year={2018}, collection={Lecture Notes of Computer Science} }'
chicago: Knollmann, Till, and Christian Scheideler. “A Self-Stabilizing Hashed Patricia
Trie.” In Proceedings of the 20th International Symposium on Stabilization,
Safety, and Security of Distributed Systems (SSS), edited by Taisuke Izumi
and Petr Kuznetsov, Vol. 11201. Lecture Notes of Computer Science. Springer, Cham,
2018. https://doi.org/10.1007/978-3-030-03232-6_1.
ieee: T. Knollmann and C. Scheideler, “A Self-Stabilizing Hashed Patricia Trie,”
in Proceedings of the 20th International Symposium on Stabilization, Safety,
and Security of Distributed Systems (SSS), Tokyo, 2018, vol. 11201.
mla: Knollmann, Till, and Christian Scheideler. “A Self-Stabilizing Hashed Patricia
Trie.” Proceedings of the 20th International Symposium on Stabilization, Safety,
and Security of Distributed Systems (SSS), edited by Taisuke Izumi and Petr
Kuznetsov, vol. 11201, Springer, Cham, 2018, doi:10.1007/978-3-030-03232-6_1.
short: 'T. Knollmann, C. Scheideler, in: T. Izumi, P. Kuznetsov (Eds.), Proceedings
of the 20th International Symposium on Stabilization, Safety, and Security of
Distributed Systems (SSS), Springer, Cham, 2018.'
conference:
end_date: 2018-11-07
location: Tokyo
name: 20th International Symposium on Stabilization, Safety, and Security of Distributed
Systems (SSS)
start_date: 2018-11-04
date_created: 2018-09-17T13:12:18Z
date_updated: 2022-01-06T07:01:02Z
ddc:
- '000'
department:
- _id: '63'
- _id: '79'
doi: 10.1007/978-3-030-03232-6_1
editor:
- first_name: Taisuke
full_name: Izumi, Taisuke
last_name: Izumi
- first_name: Petr
full_name: Kuznetsov, Petr
last_name: Kuznetsov
external_id:
arxiv:
- '1809.04923'
file:
- access_level: closed
content_type: application/pdf
creator: ups
date_created: 2018-11-02T14:38:37Z
date_updated: 2018-11-02T14:38:37Z
file_id: '5277'
file_name: ASelf-stabilizingHashedPatrici.pdf
file_size: 500005
relation: main_file
success: 1
file_date_updated: 2018-11-02T14:38:37Z
has_accepted_license: '1'
intvolume: ' 11201'
keyword:
- Self-Stabilizing
- Prefix Search
- Distributed Data Structure
language:
- iso: eng
project:
- _id: '1'
name: SFB 901
- _id: '2'
name: SFB 901 - Project Area A
- _id: '5'
name: SFB 901 - Subproject A1
publication: Proceedings of the 20th International Symposium on Stabilization, Safety,
and Security of Distributed Systems (SSS)
publisher: Springer, Cham
series_title: Lecture Notes of Computer Science
status: public
title: A Self-Stabilizing Hashed Patricia Trie
type: conference
user_id: '39241'
volume: 11201
year: '2018'
...
---
_id: '9999'
abstract:
- lang: eng
text: Ultrasonic wire bonding is an indispensable process in the industrial manufacturing
of semiconductor devices. Copper wire is increasingly replacing the well-established
aluminium wire because of its superior electrical, thermal and mechanical properties.
Copper wire processes differ significantly from aluminium processes and are more
sensitive to disturbances, which reduces the range of parameter values suitable
for a stable process. Disturbances can be compensated by an adaption of process
parameters, but finding suitable parameters manually is difficult and time-consuming.
This paper presents a physical model of the ultrasonic wire bonding process including
the friction contact between tool and wire. This model yields novel insights into
the process. A prototype of a multi-objective optimizing bonding machine (MOBM)
is presented. It uses multi-objective optimization, based on the complete process
model, to automatically select the best operating point as a compromise of concurrent
objectives.
author:
- first_name: Andreas
full_name: Unger, Andreas
last_name: Unger
- first_name: Matthias
full_name: Hunstig, Matthias
last_name: Hunstig
- first_name: Tobias
full_name: Meyer, Tobias
last_name: Meyer
- first_name: Michael
full_name: Brökelmann, Michael
last_name: Brökelmann
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
citation:
ama: 'Unger A, Hunstig M, Meyer T, Brökelmann M, Sextro W. Intelligent Production
of Wire Bonds using Multi-Objective Optimization – Insights, Opportunities and
Challenges. In: In Proceedings of IMAPS 2018 – 51st Symposium on Microelectronics,
Pasadena, CA, 2018. Vol Vol. 2018, No. 1, pp. 000572-000577. ; 2018. doi:10.4071/2380-4505-2018.1.000572'
apa: Unger, A., Hunstig, M., Meyer, T., Brökelmann, M., & Sextro, W. (2018).
Intelligent Production of Wire Bonds using Multi-Objective Optimization – Insights,
Opportunities and Challenges. In In Proceedings of IMAPS 2018 – 51st Symposium
on Microelectronics, Pasadena, CA, 2018 (Vol. Vol. 2018, No. 1, pp. 000572-000577.).
https://doi.org/10.4071/2380-4505-2018.1.000572
bibtex: '@inproceedings{Unger_Hunstig_Meyer_Brökelmann_Sextro_2018, title={Intelligent
Production of Wire Bonds using Multi-Objective Optimization – Insights, Opportunities
and Challenges}, volume={Vol. 2018, No. 1, pp. 000572-000577.}, DOI={10.4071/2380-4505-2018.1.000572},
booktitle={In Proceedings of IMAPS 2018 – 51st Symposium on Microelectronics,
Pasadena, CA, 2018}, author={Unger, Andreas and Hunstig, Matthias and Meyer, Tobias
and Brökelmann, Michael and Sextro, Walter}, year={2018} }'
chicago: Unger, Andreas, Matthias Hunstig, Tobias Meyer, Michael Brökelmann, and
Walter Sextro. “Intelligent Production of Wire Bonds Using Multi-Objective Optimization
– Insights, Opportunities and Challenges.” In In Proceedings of IMAPS 2018
– 51st Symposium on Microelectronics, Pasadena, CA, 2018, Vol. Vol. 2018,
No. 1, pp. 000572-000577., 2018. https://doi.org/10.4071/2380-4505-2018.1.000572.
ieee: A. Unger, M. Hunstig, T. Meyer, M. Brökelmann, and W. Sextro, “Intelligent
Production of Wire Bonds using Multi-Objective Optimization – Insights, Opportunities
and Challenges,” in In Proceedings of IMAPS 2018 – 51st Symposium on Microelectronics,
Pasadena, CA, 2018, 2018, vol. Vol. 2018, No. 1, pp. 000572-000577.
mla: Unger, Andreas, et al. “Intelligent Production of Wire Bonds Using Multi-Objective
Optimization – Insights, Opportunities and Challenges.” In Proceedings of IMAPS
2018 – 51st Symposium on Microelectronics, Pasadena, CA, 2018, vol. Vol. 2018,
No. 1, pp. 000572-000577., 2018, doi:10.4071/2380-4505-2018.1.000572.
short: 'A. Unger, M. Hunstig, T. Meyer, M. Brökelmann, W. Sextro, in: In Proceedings
of IMAPS 2018 – 51st Symposium on Microelectronics, Pasadena, CA, 2018, 2018.'
date_created: 2019-05-27T10:27:45Z
date_updated: 2020-05-07T05:33:56Z
department:
- _id: '151'
doi: 10.4071/2380-4505-2018.1.000572
keyword:
- wire bonding
- multi-objective optimization
- process model
- copper wire
- self-optimization
language:
- iso: eng
project:
- _id: '92'
grant_number: 02 PQ2210
name: Intelligente Herstellung zuverlässiger Kupferbondverbindungen
publication: In Proceedings of IMAPS 2018 – 51st Symposium on Microelectronics, Pasadena,
CA, 2018
quality_controlled: '1'
status: public
title: Intelligent Production of Wire Bonds using Multi-Objective Optimization – Insights,
Opportunities and Challenges
type: conference
user_id: '210'
volume: Vol. 2018, No. 1, pp. 000572-000577.
year: '2018'
...
---
_id: '32158'
abstract:
- lang: eng
text: 'Sociogenesis addresses a pervasive problem in psychology given by Cartesian
dualism that assigns the mental an inner locus apart from material activity. Aligning
ourselves to the ongoing critical discussions of interiorization in psychology,
we explore the crucial notion of space by highlighting language as sociocultural
and dialogical activity performed by other-oriented individuals. We discuss space
in terms of the “language spacetime”, a symbolic, embodied formation of mutually
positioned speaking and listening selves. This leads beyond the “inside-outside”
container metaphor and allows for a reformulation of interiorization. Interiorization
is conceptualized as a continuous series of different, though mutually related
movements between self and other and self and self that lead to and are supported
by specific formations in language activity: reversion, transposition, and decoupling.
Along a short passage of a video-based interview, we trace the reversion of dialogical
positions within the addressivity constellation of the two interlocutors, their
interactive creation of a heterotopic spacetime, and the decoupling of one speaker''s
psychological activity from the concrete here-and-now and the present other by
moving and acting into this new sphere. Interiorization appears as a movement
at the border of past, present, and possible future(s).'
author:
- first_name: Marie-Cécile
full_name: Bertau, Marie-Cécile
last_name: Bertau
- first_name: Andrea
full_name: Karsten, Andrea
id: '53917'
last_name: Karsten
citation:
ama: 'Bertau M-C, Karsten A. Reconsidering interiorization: Self moving across language
spacetimes. New Ideas in Psychology. 2018;49:7-17. doi:10.1016/j.newideapsych.2017.12.001'
apa: 'Bertau, M.-C., & Karsten, A. (2018). Reconsidering interiorization: Self
moving across language spacetimes. New Ideas in Psychology, 49,
7–17. https://doi.org/10.1016/j.newideapsych.2017.12.001'
bibtex: '@article{Bertau_Karsten_2018, title={Reconsidering interiorization: Self
moving across language spacetimes}, volume={49}, DOI={10.1016/j.newideapsych.2017.12.001},
journal={New Ideas in Psychology}, publisher={Elsevier BV}, author={Bertau, Marie-Cécile
and Karsten, Andrea}, year={2018}, pages={7–17} }'
chicago: 'Bertau, Marie-Cécile, and Andrea Karsten. “Reconsidering Interiorization:
Self Moving across Language Spacetimes.” New Ideas in Psychology 49 (2018):
7–17. https://doi.org/10.1016/j.newideapsych.2017.12.001.'
ieee: 'M.-C. Bertau and A. Karsten, “Reconsidering interiorization: Self moving
across language spacetimes,” New Ideas in Psychology, vol. 49, pp. 7–17,
2018, doi: 10.1016/j.newideapsych.2017.12.001.'
mla: 'Bertau, Marie-Cécile, and Andrea Karsten. “Reconsidering Interiorization:
Self Moving across Language Spacetimes.” New Ideas in Psychology, vol.
49, Elsevier BV, 2018, pp. 7–17, doi:10.1016/j.newideapsych.2017.12.001.'
short: M.-C. Bertau, A. Karsten, New Ideas in Psychology 49 (2018) 7–17.
date_created: 2022-06-24T14:41:20Z
date_updated: 2022-07-18T09:21:16Z
department:
- _id: '424'
doi: 10.1016/j.newideapsych.2017.12.001
intvolume: ' 49'
keyword:
- Interiorization
- Dialogical self
- Language activity
- Voice
- Vygotsky
- Heterotopia
- Video-confrontation
language:
- iso: eng
page: 7-17
publication: New Ideas in Psychology
publication_identifier:
issn:
- 0732-118X
publication_status: published
publisher: Elsevier BV
status: public
title: 'Reconsidering interiorization: Self moving across language spacetimes'
type: journal_article
user_id: '42165'
volume: 49
year: '2018'
...