---
_id: '24541'
abstract:
- lang: eng
text: The mechanical properties of joined structures are determined considerably
by the chosen joining technology. With the aim of providing a method that enables
a faster and more profound decision-making in the spatial distribution of joining
points during product development, a new method for the load path analysis of
joining points is presented. For an exemplary car body, the load type in the joining
elements, i.e. pure tensile, shear and combined tensile-shear loads, is determined
using finite element analysis (FEA). Based on the evaluated loads, the resulting
load paths in selected joining points are analyzed using a 2D FE-model of a clinching
point. State of the art methods for load path analysis are dependent on the selected
coordinate system or the existing stress state. Thus, a general statement about
the load transmission path is not possible at this time. Here, a novel method
for the analysis of load paths is used, which is independent of the alignment
of the analyzed geometry. The basic assumption of the new load path analysis method
was confirmed by using a simple specimen with a square hole in different orientations.
The results presented here show a possibility to display the load transmission
path invariantly. In further steps, the method will be extended for 3D analysis
and the investigation of more complex assemblies. The primary goal of this methodical
approach is an even load distribution over the joining elements and the component.
This will provide a basis for future design approaches aimed at reducing the number
of joining elements in joined structures.
author:
- first_name: Christian
full_name: Steinfelder, Christian
last_name: Steinfelder
- first_name: Sven
full_name: Martin, Sven
id: '38177'
last_name: Martin
- first_name: Alexander
full_name: Brosius, Alexander
last_name: Brosius
- first_name: Thomas
full_name: Tröster, Thomas
last_name: Tröster
citation:
ama: Steinfelder C, Martin S, Brosius A, Tröster T. Load Path Transmission in Joining
Elements. Key Engineering Materials. Published online 2021:73-80. doi:10.4028/www.scientific.net/kem.883.73
apa: Steinfelder, C., Martin, S., Brosius, A., & Tröster, T. (2021). Load Path
Transmission in Joining Elements. Key Engineering Materials, 73–80. https://doi.org/10.4028/www.scientific.net/kem.883.73
bibtex: '@article{Steinfelder_Martin_Brosius_Tröster_2021, title={Load Path Transmission
in Joining Elements}, DOI={10.4028/www.scientific.net/kem.883.73},
journal={Key Engineering Materials}, author={Steinfelder, Christian and Martin,
Sven and Brosius, Alexander and Tröster, Thomas}, year={2021}, pages={73–80} }'
chicago: Steinfelder, Christian, Sven Martin, Alexander Brosius, and Thomas Tröster.
“Load Path Transmission in Joining Elements.” Key Engineering Materials,
2021, 73–80. https://doi.org/10.4028/www.scientific.net/kem.883.73.
ieee: 'C. Steinfelder, S. Martin, A. Brosius, and T. Tröster, “Load Path Transmission
in Joining Elements,” Key Engineering Materials, pp. 73–80, 2021, doi:
10.4028/www.scientific.net/kem.883.73.'
mla: Steinfelder, Christian, et al. “Load Path Transmission in Joining Elements.”
Key Engineering Materials, 2021, pp. 73–80, doi:10.4028/www.scientific.net/kem.883.73.
short: C. Steinfelder, S. Martin, A. Brosius, T. Tröster, Key Engineering Materials
(2021) 73–80.
date_created: 2021-09-16T08:23:00Z
date_updated: 2023-04-28T11:57:49Z
department:
- _id: '321'
- _id: '149'
- _id: '630'
doi: 10.4028/www.scientific.net/kem.883.73
language:
- iso: eng
page: 73-80
project:
- _id: '130'
grant_number: '418701707'
name: 'TRR 285: TRR 285'
- _id: '132'
name: 'TRR 285 - B: TRR 285 - Project Area B'
- _id: '140'
name: 'TRR 285 – B01: TRR 285 - Subproject B01'
publication: Key Engineering Materials
publication_identifier:
issn:
- 1662-9795
publication_status: published
quality_controlled: '1'
status: public
title: Load Path Transmission in Joining Elements
type: journal_article
user_id: '38177'
year: '2021'
...
---
_id: '44526'
author:
- first_name: Feline
full_name: Tecklenburg, Feline
id: '99082'
last_name: Tecklenburg
orcid: 0000-0002-7155-9341
citation:
ama: 'Tecklenburg F. Wirtschaft ist Care ist radikale Demokratie. In: Fehle HJ,
Langenbacher A, eds. Dass die Welt wohnlich für alle wird. Klartexte, Anfragen,
Perspektiven. Ina Praetorius zum 65. Geburtstag. Matthias-Grünewald-Verlag;
2021.'
apa: Tecklenburg, F. (2021). Wirtschaft ist Care ist radikale Demokratie. In H.
J. Fehle & A. Langenbacher (Eds.), Dass die Welt wohnlich für alle wird.
Klartexte, Anfragen, Perspektiven. Ina Praetorius zum 65. Geburtstag. Matthias-Grünewald-Verlag.
bibtex: '@inbook{Tecklenburg_2021, place={Ostfildern}, title={Wirtschaft ist Care
ist radikale Demokratie}, booktitle={Dass die Welt wohnlich für alle wird. Klartexte,
Anfragen, Perspektiven. Ina Praetorius zum 65. Geburtstag}, publisher={Matthias-Grünewald-Verlag},
author={Tecklenburg, Feline}, editor={Fehle, Hans Jörg and Langenbacher, Andrea},
year={2021} }'
chicago: 'Tecklenburg, Feline. “Wirtschaft ist Care ist radikale Demokratie.” In
Dass die Welt wohnlich für alle wird. Klartexte, Anfragen, Perspektiven. Ina
Praetorius zum 65. Geburtstag, edited by Hans Jörg Fehle and Andrea Langenbacher.
Ostfildern: Matthias-Grünewald-Verlag, 2021.'
ieee: 'F. Tecklenburg, “Wirtschaft ist Care ist radikale Demokratie,” in Dass
die Welt wohnlich für alle wird. Klartexte, Anfragen, Perspektiven. Ina Praetorius
zum 65. Geburtstag, H. J. Fehle and A. Langenbacher, Eds. Ostfildern: Matthias-Grünewald-Verlag,
2021.'
mla: Tecklenburg, Feline. “Wirtschaft ist Care ist radikale Demokratie.” Dass
die Welt wohnlich für alle wird. Klartexte, Anfragen, Perspektiven. Ina Praetorius
zum 65. Geburtstag, edited by Hans Jörg Fehle and Andrea Langenbacher, Matthias-Grünewald-Verlag,
2021.
short: 'F. Tecklenburg, in: H.J. Fehle, A. Langenbacher (Eds.), Dass die Welt wohnlich
für alle wird. Klartexte, Anfragen, Perspektiven. Ina Praetorius zum 65. Geburtstag,
Matthias-Grünewald-Verlag, Ostfildern, 2021.'
date_created: 2023-05-05T16:37:53Z
date_updated: 2023-05-05T16:51:35Z
department:
- _id: '35'
- _id: '17'
- _id: '22'
- _id: '394'
editor:
- first_name: Hans Jörg
full_name: Fehle, Hans Jörg
last_name: Fehle
- first_name: Andrea
full_name: Langenbacher, Andrea
last_name: Langenbacher
extern: '1'
language:
- iso: ger
place: Ostfildern
publication: Dass die Welt wohnlich für alle wird. Klartexte, Anfragen, Perspektiven.
Ina Praetorius zum 65. Geburtstag
publication_identifier:
unknown:
- '9783786732556'
publication_status: published
publisher: Matthias-Grünewald-Verlag
status: public
title: Wirtschaft ist Care ist radikale Demokratie
type: book_chapter
user_id: '99082'
year: '2021'
...
---
_id: '24080'
abstract:
- lang: eng
text: Challenges of the development of mechatronic systems and corresponding production
systems have increased steadily. Changes are primarily due to increased product
complexity and the connection to the internet of things and services, enabling
Cyber-Physical Systems (CPS) and Cyber-Physical Production Systems (CPPS). Major
innovations of the revised VDI guideline 2206 for developing mechatronic systems
are systems thinking as a core element and six checkpoints for structuring deliverables
along the V-Model. These checkpoints serve for orientation in result progress
and thus enable a structured and complete development process. However, tasks
and checkpoints of the new guideline focus on the product development itself without
integrating the development of related CPPS, enabling optimization simultaneously
to system development. Implications are derived by a three-step analysis. The
paper at hand contributes fundamental extensions of the checkpoint questions regarding
integrated CPPS development. These questions provide methodical support for system
developers of CPPS for CPS by enabling the project manager to check the status,
schedule further development steps and evaluate the maturity of the whole, integrated
development.
author:
- first_name: Iris
full_name: Gräßler, Iris
id: '47565'
last_name: Gräßler
orcid: 0000-0001-5765-971X
- first_name: Dominik
full_name: Wiechel, Dominik
id: '67161'
last_name: Wiechel
- first_name: Daniel
full_name: Roesmann, Daniel
id: '54680'
last_name: Roesmann
- first_name: Henrik
full_name: Thiele, Henrik
id: '33419'
last_name: Thiele
citation:
ama: 'Gräßler I, Wiechel D, Roesmann D, Thiele H. V-model based development of cyber-physical
systems and cyber-physical production systems. In: Procedia CIRP. ; 2021:253-258.
doi:10.1016/j.procir.2021.05.119'
apa: Gräßler, I., Wiechel, D., Roesmann, D., & Thiele, H. (2021). V-model based
development of cyber-physical systems and cyber-physical production systems. Procedia
CIRP, 253–258. https://doi.org/10.1016/j.procir.2021.05.119
bibtex: '@inproceedings{Gräßler_Wiechel_Roesmann_Thiele_2021, title={V-model based
development of cyber-physical systems and cyber-physical production systems},
DOI={10.1016/j.procir.2021.05.119},
booktitle={Procedia CIRP}, author={Gräßler, Iris and Wiechel, Dominik and Roesmann,
Daniel and Thiele, Henrik}, year={2021}, pages={253–258} }'
chicago: Gräßler, Iris, Dominik Wiechel, Daniel Roesmann, and Henrik Thiele. “V-Model
Based Development of Cyber-Physical Systems and Cyber-Physical Production Systems.”
In Procedia CIRP, 253–58, 2021. https://doi.org/10.1016/j.procir.2021.05.119.
ieee: 'I. Gräßler, D. Wiechel, D. Roesmann, and H. Thiele, “V-model based development
of cyber-physical systems and cyber-physical production systems,” in Procedia
CIRP, 2021, pp. 253–258, doi: 10.1016/j.procir.2021.05.119.'
mla: Gräßler, Iris, et al. “V-Model Based Development of Cyber-Physical Systems
and Cyber-Physical Production Systems.” Procedia CIRP, 2021, pp. 253–58,
doi:10.1016/j.procir.2021.05.119.
short: 'I. Gräßler, D. Wiechel, D. Roesmann, H. Thiele, in: Procedia CIRP, 2021,
pp. 253–258.'
conference:
name: 31st CIRP Design Conference 2021 (CIRP Design 2021)
date_created: 2021-09-09T13:27:59Z
date_updated: 2023-05-09T18:22:49Z
department:
- _id: '152'
doi: 10.1016/j.procir.2021.05.119
keyword:
- Cyber-Physical Production System (CPPS)
- V-Model
- Product System Development
- Integrated Development
- VDI 2206
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.sciencedirect.com/science/article/pii/S2212827121005916
oa: '1'
page: 253-258
publication: Procedia CIRP
publication_identifier:
issn:
- 2212-8271
publication_status: published
quality_controlled: '1'
status: public
title: V-model based development of cyber-physical systems and cyber-physical production
systems
type: conference
user_id: '67161'
year: '2021'
...
---
_id: '24281'
abstract:
- lang: eng
text: 'In order to optimize production processes and to avoid errors, it is not
only necessary to automate processes, but also to integrate workers with their
individual personality and skill profiles. For this purpose, human factors should
be considered in the entire design process. The integrated view of mental human
models, the cognitive demand of the working environment and the automation design
is essential. Human-System Integration (HSI) constitutes a promising approach.
Current model-based approaches offer possibilities to analyze and optimize tasks
within an overall system, but they still lack integration. This leads to the research
question: How can human factors be integrated into a system model of a socio-technical,
Cyber-Physical Production System? The paper at hand contributes an approach of
human factor integration into the procedure of Model-Based Systems Engineering
for Cyber-Physical Production Systems (CPPS). The approach combines a system model
of a CPPS with HSI concepts. In accordance to the benefits of MBSE, SysML is selected
to integrate human factors in the development process of a CPPS. The approach
is divided into five steps, which includes the extension of the SysML meta model.
This allows the optimization of skill-based human-machine interaction. Defined
HSI-Profiles enable system developers to integrate employee requirements at early
stages within the development process. The approach is demonstrated by the maintenance
of a 3D-Printer as a case example. This research enables system developers to
depict individual workers with the help of the developed concepts and systematically
integrate them into the development process of a CPPS.'
author:
- first_name: Iris
full_name: Gräßler, Iris
id: '47565'
last_name: Gräßler
orcid: 0000-0001-5765-971X
- first_name: Dominik
full_name: Wiechel, Dominik
id: '67161'
last_name: Wiechel
- first_name: Daniel
full_name: Roesmann, Daniel
id: '54680'
last_name: Roesmann
citation:
ama: 'Gräßler I, Wiechel D, Roesmann D. Integrating human factors in the model based
development of cyber-physical production systems. In: Procedia CIRP. ;
2021:518-523. doi:10.1016/j.procir.2021.05.113'
apa: Gräßler, I., Wiechel, D., & Roesmann, D. (2021). Integrating human factors
in the model based development of cyber-physical production systems. Procedia
CIRP, 518–523. https://doi.org/10.1016/j.procir.2021.05.113
bibtex: '@inproceedings{Gräßler_Wiechel_Roesmann_2021, title={Integrating human
factors in the model based development of cyber-physical production systems},
DOI={10.1016/j.procir.2021.05.113},
booktitle={Procedia CIRP}, author={Gräßler, Iris and Wiechel, Dominik and Roesmann,
Daniel}, year={2021}, pages={518–523} }'
chicago: Gräßler, Iris, Dominik Wiechel, and Daniel Roesmann. “Integrating Human
Factors in the Model Based Development of Cyber-Physical Production Systems.”
In Procedia CIRP, 518–23, 2021. https://doi.org/10.1016/j.procir.2021.05.113.
ieee: 'I. Gräßler, D. Wiechel, and D. Roesmann, “Integrating human factors in the
model based development of cyber-physical production systems,” in Procedia
CIRP, 2021, pp. 518–523, doi: 10.1016/j.procir.2021.05.113.'
mla: Gräßler, Iris, et al. “Integrating Human Factors in the Model Based Development
of Cyber-Physical Production Systems.” Procedia CIRP, 2021, pp. 518–23,
doi:10.1016/j.procir.2021.05.113.
short: 'I. Gräßler, D. Wiechel, D. Roesmann, in: Procedia CIRP, 2021, pp. 518–523.'
conference:
end_date: 21-05-2021
name: Procedia CIRP
start_date: 19-05-2021
date_created: 2021-09-13T14:51:45Z
date_updated: 2023-05-09T18:23:36Z
department:
- _id: '152'
doi: 10.1016/j.procir.2021.05.113
language:
- iso: eng
page: 518-523
publication: Procedia CIRP
publication_identifier:
issn:
- 2212-8271
publication_status: published
quality_controlled: '1'
status: public
title: Integrating human factors in the model based development of cyber-physical
production systems
type: conference
user_id: '67161'
year: '2021'
...
---
_id: '45640'
abstract:
- lang: eng
text: "I study a dynamic variant of the Dixitâ\x80\x93Stiglitz (Am Econ Rev 67(3),
1977) model of monopolistic competition by introducing price stickiness à la
Fershtman and Kamien (Econometrica 55(5), 1987). The analysis is restricted to
bounded quantity and price paths that fulfill the necessary conditions for an
open-loop Nash equilibrium. I show that there exists a symmetric steady state
and that its stability depends on the degree of product differentiation. When
moving from complements to perfect substitutes, the steady state is either a locally
asymptotically unstable (spiral) source, a stable (spiral) sink or a saddle point.
I further apply the Hopf bifurcation theorem and prove the existence of limit
cycles, when passing from a stable to an unstable steady state. Lastly, I provide
a numerical example and show that there exists a stable limit cycle."
author:
- first_name: Simon
full_name: Hoof, Simon
last_name: Hoof
citation:
ama: Hoof S. Dynamic Monopolistic Competition. Journal of Optimization Theory
and Applications. 2021;189(2).
apa: Hoof, S. (2021). Dynamic Monopolistic Competition. Journal of Optimization
Theory and Applications, 189(2).
bibtex: '@article{Hoof_2021, title={Dynamic Monopolistic Competition}, volume={189},
number={2}, journal={Journal of Optimization Theory and Applications}, publisher={Springer},
author={Hoof, Simon}, year={2021} }'
chicago: Hoof, Simon. “Dynamic Monopolistic Competition.” Journal of Optimization
Theory and Applications 189, no. 2 (2021).
ieee: S. Hoof, “Dynamic Monopolistic Competition,” Journal of Optimization Theory
and Applications, vol. 189, no. 2, 2021.
mla: Hoof, Simon. “Dynamic Monopolistic Competition.” Journal of Optimization
Theory and Applications, vol. 189, no. 2, Springer, 2021.
short: S. Hoof, Journal of Optimization Theory and Applications 189 (2021).
date_created: 2023-06-15T14:05:25Z
date_updated: 2023-07-05T07:23:54Z
department:
- _id: '205'
- _id: '475'
intvolume: ' 189'
issue: '2'
language:
- iso: eng
project:
- _id: '7'
grant_number: '160364472'
name: 'SFB 901 - A3: SFB 901 - Der Markt für Services: Anreize, Algorithmen, Implementation
(Subproject A3)'
- _id: '1'
grant_number: '160364472'
name: 'SFB 901: SFB 901: On-The-Fly Computing - Individualisierte IT-Dienstleistungen
in dynamischen Märkten '
- _id: '2'
name: 'SFB 901 - A: SFB 901 - Project Area A'
publication: Journal of Optimization Theory and Applications
publication_identifier:
issn:
- 1573-2878
publication_status: published
publisher: Springer
quality_controlled: '1'
status: public
title: Dynamic Monopolistic Competition
type: journal_article
user_id: '477'
volume: 189
year: '2021'
...
---
_id: '46078'
abstract:
- lang: eng
text: "Abstract\r\n Aim\r\n
\ To identify and summarize the evidence for the effect
of health-oriented leadership interventions on health and well-being outcomes
at the employee level following the Preferred Reporting Items for Systematic Reviews
and Meta-Analyses statement (Moher et al. 2009).\r\n \r\n
\ Subject and Methods\r\n A
systematic search of relevant studies was conducted in multiple databases. Randomized
controlled trials (RCTs), cluster-randomized controlled trials (cRCTs) and controlled
before–after studies (CBAs) were included based on the following criteria: interventions
that addressed supervisors, to raise awareness for the importance of health issues,
teach mindfulness practices for conscious awareness, reduce stress and promote
resources at the level of individual behavior, and evaluated the effect on at
least one outcome of psychomental stress, absenteeism and well-being on the employee
level.\r\n \r\n Results\r\n
\ Of 6126 publications retrieved, ten studies were identified
for analysis. Significant effects of leadership training were reported on exhaustion
tendency, self-reported sickness absence, work-related sickness absence and job
satisfaction in studies comparing health-oriented training programs to no intervention.
Studies comparing health-oriented leadership training to other training did not
report significant effects. Risk of bias was judged to be high in seven studies
and unclear in three studies.\r\n \r\n
\ Conclusion\r\n Evidence
for the effectiveness of health-oriented leadership interventions on employees’
stress, absenteeism or well-being is judged to be low, clearly indicating the
need for more and higher-quality research.\r\n "
author:
- first_name: Indra
full_name: Dannheim, Indra
last_name: Dannheim
- first_name: Helena
full_name: Ludwig-Walz, Helena
last_name: Ludwig-Walz
- first_name: Anette
full_name: Buyken, Anette
id: '65985'
last_name: Buyken
- first_name: Valerie
full_name: Grimm, Valerie
last_name: Grimm
- first_name: Anja
full_name: Kroke, Anja
last_name: Kroke
citation:
ama: 'Dannheim I, Ludwig-Walz H, Buyken A, Grimm V, Kroke A. Effectiveness of health-oriented
leadership interventions for improving health and wellbeing of employees: a systematic
review. Journal of Public Health. 2021;30(12):2777-2789. doi:10.1007/s10389-021-01664-1'
apa: 'Dannheim, I., Ludwig-Walz, H., Buyken, A., Grimm, V., & Kroke, A. (2021).
Effectiveness of health-oriented leadership interventions for improving health
and wellbeing of employees: a systematic review. Journal of Public Health,
30(12), 2777–2789. https://doi.org/10.1007/s10389-021-01664-1'
bibtex: '@article{Dannheim_Ludwig-Walz_Buyken_Grimm_Kroke_2021, title={Effectiveness
of health-oriented leadership interventions for improving health and wellbeing
of employees: a systematic review}, volume={30}, DOI={10.1007/s10389-021-01664-1},
number={12}, journal={Journal of Public Health}, publisher={Springer Science and
Business Media LLC}, author={Dannheim, Indra and Ludwig-Walz, Helena and Buyken,
Anette and Grimm, Valerie and Kroke, Anja}, year={2021}, pages={2777–2789} }'
chicago: 'Dannheim, Indra, Helena Ludwig-Walz, Anette Buyken, Valerie Grimm, and
Anja Kroke. “Effectiveness of Health-Oriented Leadership Interventions for Improving
Health and Wellbeing of Employees: A Systematic Review.” Journal of Public
Health 30, no. 12 (2021): 2777–89. https://doi.org/10.1007/s10389-021-01664-1.'
ieee: 'I. Dannheim, H. Ludwig-Walz, A. Buyken, V. Grimm, and A. Kroke, “Effectiveness
of health-oriented leadership interventions for improving health and wellbeing
of employees: a systematic review,” Journal of Public Health, vol. 30,
no. 12, pp. 2777–2789, 2021, doi: 10.1007/s10389-021-01664-1.'
mla: 'Dannheim, Indra, et al. “Effectiveness of Health-Oriented Leadership Interventions
for Improving Health and Wellbeing of Employees: A Systematic Review.” Journal
of Public Health, vol. 30, no. 12, Springer Science and Business Media LLC,
2021, pp. 2777–89, doi:10.1007/s10389-021-01664-1.'
short: I. Dannheim, H. Ludwig-Walz, A. Buyken, V. Grimm, A. Kroke, Journal of Public
Health 30 (2021) 2777–2789.
date_created: 2023-07-18T09:34:03Z
date_updated: 2023-07-18T09:35:41Z
department:
- _id: '22'
doi: 10.1007/s10389-021-01664-1
intvolume: ' 30'
issue: '12'
keyword:
- Public Health
- Environmental and Occupational Health
language:
- iso: eng
page: 2777-2789
publication: Journal of Public Health
publication_identifier:
issn:
- 2198-1833
- 1613-2238
publication_status: published
publisher: Springer Science and Business Media LLC
status: public
title: 'Effectiveness of health-oriented leadership interventions for improving health
and wellbeing of employees: a systematic review'
type: journal_article
user_id: '92491'
volume: 30
year: '2021'
...
---
_id: '21436'
abstract:
- lang: eng
text: Ultrasonic wire bonding is a solid-state joining process, used in the electronics
industry to form electrical connections, e.g. to connect electrical terminals
within semiconductor modules. Many process parameters affect the bond strength,
such like the bond normal force, ultrasonic power, wire material and bonding frequency.
Today, process design, development, and optimization is most likely based on the
knowledge of process engineers and is mainly performed by experimental testing.
In this contribution, a newly developed simulation tool is presented, to reduce
time and costs and efficiently determine optimized process parameter. Based on
a co-simulation of MATLAB and ANSYS, the different physical phenomena of the wire
bonding process are considered using finite element simulation for the complex
plastic deformation of the wire and reduced order models for the transient dynamics
of the transducer, wire, substrate and bond formation. The model parameters such
as the coefficients of friction between bond tool and wire and between wire and
substrate were determined for aluminium and copper wire in experiments with a
test rig specially developed for the requirements of heavy wire bonding. To reduce
simulation time, for the finite element simulation a restart analysis and high
performance computing is utilized. Detailed analysis of the bond formation showed,
that the normal pressure distribution in the contact between wire and substrate
has high impact on bond formation and distribution of welded areas in the contact
area.
author:
- first_name: Reinhard
full_name: Schemmel, Reinhard
id: '28647'
last_name: Schemmel
- first_name: Viktor
full_name: Krieger, Viktor
last_name: Krieger
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
citation:
ama: Schemmel R, Krieger V, Hemsel T, Sextro W. Co-simulation of MATLAB and ANSYS
for ultrasonic wire bonding process optimization. Microelectronics Reliability.
2021;119:114077. doi:https://doi.org/10.1016/j.microrel.2021.114077
apa: Schemmel, R., Krieger, V., Hemsel, T., & Sextro, W. (2021). Co-simulation
of MATLAB and ANSYS for ultrasonic wire bonding process optimization. Microelectronics
Reliability, 119, 114077. https://doi.org/10.1016/j.microrel.2021.114077
bibtex: '@article{Schemmel_Krieger_Hemsel_Sextro_2021, title={Co-simulation of MATLAB
and ANSYS for ultrasonic wire bonding process optimization}, volume={119}, DOI={https://doi.org/10.1016/j.microrel.2021.114077},
journal={Microelectronics Reliability}, author={Schemmel, Reinhard and Krieger,
Viktor and Hemsel, Tobias and Sextro, Walter}, year={2021}, pages={114077} }'
chicago: 'Schemmel, Reinhard, Viktor Krieger, Tobias Hemsel, and Walter Sextro.
“Co-Simulation of MATLAB and ANSYS for Ultrasonic Wire Bonding Process Optimization.”
Microelectronics Reliability 119 (2021): 114077. https://doi.org/10.1016/j.microrel.2021.114077.'
ieee: 'R. Schemmel, V. Krieger, T. Hemsel, and W. Sextro, “Co-simulation of MATLAB
and ANSYS for ultrasonic wire bonding process optimization,” Microelectronics
Reliability, vol. 119, p. 114077, 2021, doi: https://doi.org/10.1016/j.microrel.2021.114077.'
mla: Schemmel, Reinhard, et al. “Co-Simulation of MATLAB and ANSYS for Ultrasonic
Wire Bonding Process Optimization.” Microelectronics Reliability, vol.
119, 2021, p. 114077, doi:https://doi.org/10.1016/j.microrel.2021.114077.
short: R. Schemmel, V. Krieger, T. Hemsel, W. Sextro, Microelectronics Reliability
119 (2021) 114077.
date_created: 2021-03-10T09:37:02Z
date_updated: 2023-09-21T14:15:33Z
department:
- _id: '151'
doi: https://doi.org/10.1016/j.microrel.2021.114077
intvolume: ' 119'
keyword:
- Ultrasonic heavy wire bonding
- Co-simulation
- ANSYS
- MATLAB
- Process optimization
- Friction coefficient
- Copper-copper
- Aluminium-copper
language:
- iso: eng
page: '114077'
publication: Microelectronics Reliability
publication_identifier:
issn:
- 0026-2714
publication_status: published
quality_controlled: '1'
status: public
title: Co-simulation of MATLAB and ANSYS for ultrasonic wire bonding process optimization
type: journal_article
user_id: '210'
volume: 119
year: '2021'
...
---
_id: '29936'
author:
- first_name: Arjun
full_name: Ramaswami, Arjun
id: '49171'
last_name: Ramaswami
orcid: https://orcid.org/0000-0002-0909-1178
- first_name: Tobias
full_name: Kenter, Tobias
id: '3145'
last_name: Kenter
- first_name: Thomas
full_name: Kühne, Thomas
id: '49079'
last_name: Kühne
- first_name: Christian
full_name: Plessl, Christian
id: '16153'
last_name: Plessl
orcid: 0000-0001-5728-9982
citation:
ama: 'Ramaswami A, Kenter T, Kühne T, Plessl C. Evaluating the Design Space for
Offloading 3D FFT Calculations to an FPGA for High-Performance Computing. In:
Applied Reconfigurable Computing. Architectures, Tools, and Applications.
Springer International Publishing; 2021. doi:10.1007/978-3-030-79025-7_21'
apa: Ramaswami, A., Kenter, T., Kühne, T., & Plessl, C. (2021). Evaluating the
Design Space for Offloading 3D FFT Calculations to an FPGA for High-Performance
Computing. In Applied Reconfigurable Computing. Architectures, Tools, and Applications.
Int. Conf. on Applied Reconfigurable Computing. Architectures, Tools, and Applications.
Springer International Publishing. https://doi.org/10.1007/978-3-030-79025-7_21
bibtex: '@inbook{Ramaswami_Kenter_Kühne_Plessl_2021, place={Cham}, title={Evaluating
the Design Space for Offloading 3D FFT Calculations to an FPGA for High-Performance
Computing}, DOI={10.1007/978-3-030-79025-7_21},
booktitle={Applied Reconfigurable Computing. Architectures, Tools, and Applications},
publisher={Springer International Publishing}, author={Ramaswami, Arjun and Kenter,
Tobias and Kühne, Thomas and Plessl, Christian}, year={2021} }'
chicago: 'Ramaswami, Arjun, Tobias Kenter, Thomas Kühne, and Christian Plessl. “Evaluating
the Design Space for Offloading 3D FFT Calculations to an FPGA for High-Performance
Computing.” In Applied Reconfigurable Computing. Architectures, Tools, and
Applications. Cham: Springer International Publishing, 2021. https://doi.org/10.1007/978-3-030-79025-7_21.'
ieee: 'A. Ramaswami, T. Kenter, T. Kühne, and C. Plessl, “Evaluating the Design
Space for Offloading 3D FFT Calculations to an FPGA for High-Performance Computing,”
in Applied Reconfigurable Computing. Architectures, Tools, and Applications,
Cham: Springer International Publishing, 2021.'
mla: Ramaswami, Arjun, et al. “Evaluating the Design Space for Offloading 3D FFT
Calculations to an FPGA for High-Performance Computing.” Applied Reconfigurable
Computing. Architectures, Tools, and Applications, Springer International
Publishing, 2021, doi:10.1007/978-3-030-79025-7_21.
short: 'A. Ramaswami, T. Kenter, T. Kühne, C. Plessl, in: Applied Reconfigurable
Computing. Architectures, Tools, and Applications, Springer International Publishing,
Cham, 2021.'
conference:
name: Int. Conf. on Applied Reconfigurable Computing. Architectures, Tools, and
Applications
date_created: 2022-02-21T14:22:01Z
date_updated: 2023-09-26T11:40:45Z
department:
- _id: '27'
- _id: '518'
- _id: '304'
doi: 10.1007/978-3-030-79025-7_21
language:
- iso: eng
place: Cham
publication: Applied Reconfigurable Computing. Architectures, Tools, and Applications
publication_identifier:
isbn:
- '9783030790240'
- '9783030790257'
issn:
- 0302-9743
- 1611-3349
publication_status: published
publisher: Springer International Publishing
quality_controlled: '1'
status: public
title: Evaluating the Design Space for Offloading 3D FFT Calculations to an FPGA for
High-Performance Computing
type: book_chapter
user_id: '15278'
year: '2021'
...
---
_id: '37547'
alternative_title:
- Journal der Schreibwissenschaft 22 (3), S. 52-63
author:
- first_name: Stefanie
full_name: Vochatzer, Stefanie
id: '95153'
last_name: Vochatzer
- first_name: 'Sebastian '
full_name: 'Engelmann , Sebastian '
last_name: 'Engelmann '
citation:
ama: Vochatzer S, Engelmann S. Autoethnografie und Kreatives Schreiben. Journal
der Schreibwissenschaft. 2021;3(22):52-63. doi:10.3278/JOS2102W052
apa: Vochatzer, S., & Engelmann , S. (2021). Autoethnografie und Kreatives
Schreiben. Journal der Schreibwissenschaft, 3(22), 52–63. https://doi.org/10.3278/JOS2102W052
bibtex: '@article{Vochatzer_Engelmann _2021, title={ Autoethnografie und Kreatives
Schreiben}, volume={3}, DOI={10.3278/JOS2102W052},
number={22}, journal={Journal der Schreibwissenschaft}, publisher={WBV}, author={Vochatzer,
Stefanie and Engelmann , Sebastian }, year={2021}, pages={52–63} }'
chicago: 'Vochatzer, Stefanie, and Sebastian Engelmann . “ Autoethnografie und
Kreatives Schreiben.” Journal der Schreibwissenschaft 3, no. 22 (2021):
52–63. https://doi.org/10.3278/JOS2102W052.'
ieee: 'S. Vochatzer and S. Engelmann , “ Autoethnografie und Kreatives Schreiben,”
Journal der Schreibwissenschaft, vol. 3, no. 22, pp. 52–63, 2021, doi:
10.3278/JOS2102W052.'
mla: Vochatzer, Stefanie, and Sebastian Engelmann . “ Autoethnografie und Kreatives
Schreiben.” Journal der Schreibwissenschaft, vol. 3, no. 22, WBV, 2021,
pp. 52–63, doi:10.3278/JOS2102W052.
short: S. Vochatzer, S. Engelmann , Journal der Schreibwissenschaft 3 (2021) 52–63.
date_created: 2023-01-19T10:28:15Z
date_updated: 2025-05-25T12:51:43Z
department:
- _id: '723'
- _id: '724'
- _id: '36'
doi: 10.3278/JOS2102W052
intvolume: ' 3'
issue: '22'
language:
- iso: ger
page: 52-63
publication: Journal der Schreibwissenschaft
publication_status: published
publisher: WBV
status: public
title: ' Autoethnografie und Kreatives Schreiben'
type: journal_article
user_id: '95153'
volume: 3
year: '2021'
...
---
_id: '51202'
abstract:
- lang: eng
text: When joining lightweight parts of various materials, clinching is
a cost efficient solution. In a production line, the quality of a clinch point
is primarily controlled by measurement of dimensions, which are accessible from
outside. However, methods such as visual testing and measuring the bottom thickness
as well as the outer diameter are not able to deliver any information about the
most significant geometrical characteristic of the clinch point, neck thickness
and undercut. Furthermore, ex-situ destructive methods such as microsectioning
cannot detect elastic deformations and cracks that close after unloading. In order
to exceed the current limits, a new non-destructive in-situ testing method for
the clinching process is necessary. This work proposes a concept to characterize
clinch points in-situ by combining two complementary non-destructive methods,
namely, computed tomography (CT) and ultrasonic testing. Firstly, clinch points
with different geometrical characteristics are analysed experimentally using ex-situ
CT to get a highly spatially resolved 3D-image of the object. In this context,
highly X-ray attenuating materials enhancing the visibility of the sheet-sheet
interface are investigated. Secondly, the test specimens are modelled using finite
element method (FEM) and a transient dynamic analysis (TDA) is conducted to study
the effect of the geometrical differences on the deformation energy and to qualify
the TDA as a fast in-situ non-destructive method for characterizing clinch points
at high temporal resolution.
author:
- first_name: Daniel
full_name: Köhler, Daniel
last_name: Köhler
- first_name: Behdad
full_name: Sadeghian, Behdad
last_name: Sadeghian
- first_name: Robert
full_name: Kupfer, Robert
last_name: Kupfer
- first_name: Juliane
full_name: Troschitz, Juliane
last_name: Troschitz
- first_name: Maik
full_name: Gude, Maik
last_name: Gude
- first_name: Alexander
full_name: Brosius, Alexander
last_name: Brosius
citation:
ama: Köhler D, Sadeghian B, Kupfer R, Troschitz J, Gude M, Brosius A. A Method for
Characterization of Geometric Deviations in Clinch Points with Computed Tomography
and Transient Dynamic Analysis. Key Engineering Materials. 2021;883:89-96.
doi:10.4028/www.scientific.net/kem.883.89
apa: Köhler, D., Sadeghian, B., Kupfer, R., Troschitz, J., Gude, M., & Brosius,
A. (2021). A Method for Characterization of Geometric Deviations in Clinch Points
with Computed Tomography and Transient Dynamic Analysis. Key Engineering Materials,
883, 89–96. https://doi.org/10.4028/www.scientific.net/kem.883.89
bibtex: '@article{Köhler_Sadeghian_Kupfer_Troschitz_Gude_Brosius_2021, title={A
Method for Characterization of Geometric Deviations in Clinch Points with Computed
Tomography and Transient Dynamic Analysis}, volume={883}, DOI={10.4028/www.scientific.net/kem.883.89},
journal={Key Engineering Materials}, publisher={Trans Tech Publications, Ltd.},
author={Köhler, Daniel and Sadeghian, Behdad and Kupfer, Robert and Troschitz,
Juliane and Gude, Maik and Brosius, Alexander}, year={2021}, pages={89–96} }'
chicago: 'Köhler, Daniel, Behdad Sadeghian, Robert Kupfer, Juliane Troschitz, Maik
Gude, and Alexander Brosius. “A Method for Characterization of Geometric Deviations
in Clinch Points with Computed Tomography and Transient Dynamic Analysis.” Key
Engineering Materials 883 (2021): 89–96. https://doi.org/10.4028/www.scientific.net/kem.883.89.'
ieee: 'D. Köhler, B. Sadeghian, R. Kupfer, J. Troschitz, M. Gude, and A. Brosius,
“A Method for Characterization of Geometric Deviations in Clinch Points with Computed
Tomography and Transient Dynamic Analysis,” Key Engineering Materials,
vol. 883, pp. 89–96, 2021, doi: 10.4028/www.scientific.net/kem.883.89.'
mla: Köhler, Daniel, et al. “A Method for Characterization of Geometric Deviations
in Clinch Points with Computed Tomography and Transient Dynamic Analysis.” Key
Engineering Materials, vol. 883, Trans Tech Publications, Ltd., 2021, pp.
89–96, doi:10.4028/www.scientific.net/kem.883.89.
short: D. Köhler, B. Sadeghian, R. Kupfer, J. Troschitz, M. Gude, A. Brosius, Key
Engineering Materials 883 (2021) 89–96.
date_created: 2024-02-06T15:06:14Z
date_updated: 2025-06-02T20:19:57Z
department:
- _id: '157'
- _id: '43'
doi: 10.4028/www.scientific.net/kem.883.89
intvolume: ' 883'
keyword:
- Mechanical Engineering
- Mechanics of Materials
- General Materials Science
language:
- iso: eng
page: 89-96
project:
- _id: '130'
grant_number: '418701707'
name: 'TRR 285: TRR 285'
- _id: '133'
name: 'TRR 285 - C: TRR 285 - Project Area C'
- _id: '148'
name: 'TRR 285 – C04: TRR 285 - Subproject C04'
publication: Key Engineering Materials
publication_identifier:
issn:
- 1662-9795
publication_status: published
publisher: Trans Tech Publications, Ltd.
status: public
title: A Method for Characterization of Geometric Deviations in Clinch Points with
Computed Tomography and Transient Dynamic Analysis
type: journal_article
user_id: '83408'
volume: 883
year: '2021'
...
---
_id: '24159'
abstract:
- lang: eng
text: "The online fitting of a microscopic traffic simulation model to reconstruct
the current state of a real traffic\r\narea can be challenging depending on the
provided data. This paper presents a novel method based on limited\r\ndata from
sensors positioned at specific locations and guarantees a general accordance of
reality and\r\nsimulation in terms of multimodal road traffic counts and vehicle
speeds. In these considerations, the actual\r\npurpose of research is of particular
importance. Here, the research aims at improving the traffic flow by\r\ncontrolling
the Traffic Light Systems (TLS) of the examined area which is why the current
traffic state and\r\nthe route choices of individual road users are the matter
of interest. An integer optimization problem is derived\r\nto fit the current
simulation to the latest field measurements. The concept can be transferred to
any road traffic\r\nnetwork and results in an observation of the current multimodal
traffic state matching at the given sensor\r\nposition. First case studies show
promosing results in terms of deviations between reality and simulation."
author:
- first_name: Kevin
full_name: Malena, Kevin
id: '36303'
last_name: Malena
orcid: 0000-0003-1183-4679
- first_name: Christopher
full_name: Link, Christopher
id: '38249'
last_name: Link
- first_name: Sven
full_name: Mertin, Sven
id: '13195'
last_name: Mertin
- first_name: Sandra
full_name: Gausemeier, Sandra
id: '17793'
last_name: Gausemeier
- first_name: Ansgar
full_name: Trächtler, Ansgar
id: '552'
last_name: Trächtler
citation:
ama: 'Malena K, Link C, Mertin S, Gausemeier S, Trächtler A. Online State Estimation
for Microscopic Traffic Simulations using Multiple Data Sources*. In: VEHITS
2021 Proceedings of the 7th International Conference on Vehicle Technology and
Intelligent Transport Systems. Vol 7. VEHITS 2021 Proceedings of the 7th International
Conference on Vehicle Technology and Intelligent Transport Systems. SCITEPRESS;
2021:386-395.'
apa: Malena, K., Link, C., Mertin, S., Gausemeier, S., & Trächtler, A. (2021).
Online State Estimation for Microscopic Traffic Simulations using Multiple Data
Sources*. VEHITS 2021 Proceedings of the 7th International Conference on Vehicle
Technology and Intelligent Transport Systems, 7, 386–395.
bibtex: '@inproceedings{Malena_Link_Mertin_Gausemeier_Trächtler_2021, place={Portugal},
series={VEHITS 2021 Proceedings of the 7th International Conference on Vehicle
Technology and Intelligent Transport Systems}, title={Online State Estimation
for Microscopic Traffic Simulations using Multiple Data Sources*}, volume={7},
booktitle={VEHITS 2021 Proceedings of the 7th International Conference on Vehicle
Technology and Intelligent Transport Systems}, publisher={SCITEPRESS}, author={Malena,
Kevin and Link, Christopher and Mertin, Sven and Gausemeier, Sandra and Trächtler,
Ansgar}, year={2021}, pages={386–395}, collection={VEHITS 2021 Proceedings of
the 7th International Conference on Vehicle Technology and Intelligent Transport
Systems} }'
chicago: 'Malena, Kevin, Christopher Link, Sven Mertin, Sandra Gausemeier, and Ansgar
Trächtler. “Online State Estimation for Microscopic Traffic Simulations Using
Multiple Data Sources*.” In VEHITS 2021 Proceedings of the 7th International
Conference on Vehicle Technology and Intelligent Transport Systems, 7:386–95.
VEHITS 2021 Proceedings of the 7th International Conference on Vehicle Technology
and Intelligent Transport Systems. Portugal: SCITEPRESS, 2021.'
ieee: K. Malena, C. Link, S. Mertin, S. Gausemeier, and A. Trächtler, “Online State
Estimation for Microscopic Traffic Simulations using Multiple Data Sources*,”
in VEHITS 2021 Proceedings of the 7th International Conference on Vehicle Technology
and Intelligent Transport Systems, Online Streaming, 2021, vol. 7, pp. 386–395.
mla: Malena, Kevin, et al. “Online State Estimation for Microscopic Traffic Simulations
Using Multiple Data Sources*.” VEHITS 2021 Proceedings of the 7th International
Conference on Vehicle Technology and Intelligent Transport Systems, vol. 7,
SCITEPRESS, 2021, pp. 386–95.
short: 'K. Malena, C. Link, S. Mertin, S. Gausemeier, A. Trächtler, in: VEHITS 2021
Proceedings of the 7th International Conference on Vehicle Technology and Intelligent
Transport Systems, SCITEPRESS, Portugal, 2021, pp. 386–395.'
conference:
end_date: 2021-04-30
location: Online Streaming
name: 7th International Conference on Vehicle Technology and Intelligent Transport
Systems
start_date: 2021-04-28
date_created: 2021-09-10T12:19:14Z
date_updated: 2026-01-26T08:49:53Z
department:
- _id: '153'
intvolume: ' 7'
keyword:
- Microscopic Traffic Simulation
- Online State Estimation
- Mixed Road Users
- Sensor Fusion
- Integer Programming
- Route Choice
- Vehicle2Infrastructure
language:
- iso: eng
main_file_link:
- url: https://www.scitepress.org/PublicationsDetail.aspx?ID=3xZWfOSENWk=&t=1
page: 386-395
place: Portugal
project:
- _id: '688'
name: Pilotprojekt "Schlosskreuzung"
publication: VEHITS 2021 Proceedings of the 7th International Conference on Vehicle
Technology and Intelligent Transport Systems
publication_identifier:
isbn:
- 978-989-758-513-5
publication_status: published
publisher: SCITEPRESS
quality_controlled: '1'
related_material:
link:
- relation: confirmation
url: https://www.scitepress.org/PublicationsDetail.aspx?ID=3xZWfOSENWk=&t=1
record:
- id: '33849'
relation: is_continued_by
status: public
series_title: VEHITS 2021 Proceedings of the 7th International Conference on Vehicle
Technology and Intelligent Transport Systems
status: public
title: Online State Estimation for Microscopic Traffic Simulations using Multiple
Data Sources*
type: conference
user_id: '36303'
volume: 7
year: '2021'
...
---
_id: '63156'
abstract:
- lang: eng
text: GaAs quantum dots (QDs) have recently emerged as state-of-the-art
semiconductor sources of polarization-entangled photon pairs, however, without
site-control capability. In this work, we present a systematic study of epitaxially
grown GaAs/AlxGa1-xAs site-controlled pyramidal QDs possessing unrivaled excitonic
uniformity in comparison to their InGaAs counterparts or GaAs QDs fabricated by
other techniques. We have experimentally and systematically investigated the binding
energy of biexcitons, highlighting the importance of the uniformity of all excitonic
lines, rather than concentrating solely on the uniformity of the neutral exciton
as a typical figure of merit, as it is normally done in the literature. We present
optical signatures of GaAs QDs within a range of ∼250 meV with a remarkable uniformity
within each individual sample, the ability to excite the biexciton state resonantly,
and a systematic study of the fine-structure splitting (FSS) values—features important
for polarization entangled photon emission. While, in general, we observe relatively
large FSS distribution and associated non-uniformities, we discuss several strategies
to suppress the average FSS values to <15 μeV.
article_number: '073103'
author:
- first_name: Iman
full_name: Ranjbar Jahromi, Iman
last_name: Ranjbar Jahromi
- first_name: Gediminas
full_name: Juska, Gediminas
last_name: Juska
- first_name: Simone
full_name: Varo, Simone
last_name: Varo
- first_name: Francesco
full_name: Basso Basset, Francesco
last_name: Basso Basset
- first_name: Francesco
full_name: Salusti, Francesco
last_name: Salusti
- first_name: Rinaldo
full_name: Trotta, Rinaldo
last_name: Trotta
- first_name: Agnieszka
full_name: Gocalinska, Agnieszka
last_name: Gocalinska
- first_name: Francesco
full_name: Mattana, Francesco
last_name: Mattana
- first_name: Emanuele
full_name: Pelucchi, Emanuele
last_name: Pelucchi
citation:
ama: Ranjbar Jahromi I, Juska G, Varo S, et al. Optical properties and symmetry
optimization of spectrally (excitonically) uniform site-controlled GaAs pyramidal
quantum dots. Applied Physics Letters. 2021;118(7). doi:10.1063/5.0030296
apa: Ranjbar Jahromi, I., Juska, G., Varo, S., Basso Basset, F., Salusti, F., Trotta,
R., Gocalinska, A., Mattana, F., & Pelucchi, E. (2021). Optical properties
and symmetry optimization of spectrally (excitonically) uniform site-controlled
GaAs pyramidal quantum dots. Applied Physics Letters, 118(7), Article
073103. https://doi.org/10.1063/5.0030296
bibtex: '@article{Ranjbar Jahromi_Juska_Varo_Basso Basset_Salusti_Trotta_Gocalinska_Mattana_Pelucchi_2021,
title={Optical properties and symmetry optimization of spectrally (excitonically)
uniform site-controlled GaAs pyramidal quantum dots}, volume={118}, DOI={10.1063/5.0030296},
number={7073103}, journal={Applied Physics Letters}, publisher={AIP Publishing},
author={Ranjbar Jahromi, Iman and Juska, Gediminas and Varo, Simone and Basso
Basset, Francesco and Salusti, Francesco and Trotta, Rinaldo and Gocalinska, Agnieszka
and Mattana, Francesco and Pelucchi, Emanuele}, year={2021} }'
chicago: Ranjbar Jahromi, Iman, Gediminas Juska, Simone Varo, Francesco Basso Basset,
Francesco Salusti, Rinaldo Trotta, Agnieszka Gocalinska, Francesco Mattana, and
Emanuele Pelucchi. “Optical Properties and Symmetry Optimization of Spectrally
(Excitonically) Uniform Site-Controlled GaAs Pyramidal Quantum Dots.” Applied
Physics Letters 118, no. 7 (2021). https://doi.org/10.1063/5.0030296.
ieee: 'I. Ranjbar Jahromi et al., “Optical properties and symmetry optimization
of spectrally (excitonically) uniform site-controlled GaAs pyramidal quantum dots,”
Applied Physics Letters, vol. 118, no. 7, Art. no. 073103, 2021, doi: 10.1063/5.0030296.'
mla: Ranjbar Jahromi, Iman, et al. “Optical Properties and Symmetry Optimization
of Spectrally (Excitonically) Uniform Site-Controlled GaAs Pyramidal Quantum Dots.”
Applied Physics Letters, vol. 118, no. 7, 073103, AIP Publishing, 2021,
doi:10.1063/5.0030296.
short: I. Ranjbar Jahromi, G. Juska, S. Varo, F. Basso Basset, F. Salusti, R. Trotta,
A. Gocalinska, F. Mattana, E. Pelucchi, Applied Physics Letters 118 (2021).
date_created: 2025-12-16T15:20:35Z
date_updated: 2025-12-17T15:14:13Z
doi: 10.1063/5.0030296
intvolume: ' 118'
issue: '7'
language:
- iso: eng
publication: Applied Physics Letters
publication_identifier:
issn:
- 0003-6951
- 1077-3118
publication_status: published
publisher: AIP Publishing
status: public
title: Optical properties and symmetry optimization of spectrally (excitonically)
uniform site-controlled GaAs pyramidal quantum dots
type: journal_article
user_id: '94793'
volume: 118
year: '2021'
...
---
_id: '25212'
abstract:
- lang: eng
text: "Finding a good query plan is key to the optimization of query runtime. This
holds in particular for cost-based federation\r\nengines, which make use of cardinality
estimations to achieve this goal. A number of studies compare SPARQL federation
engines across different performance metrics, including query runtime, result
set completeness and correctness, number of sources selected and number of requests
sent. Albeit informative, these metrics are generic and unable to quantify and
evaluate the accuracy of the cardinality estimators of cost-based federation engines.
To thoroughly evaluate cost-based federation engines, the effect of estimated
cardinality errors on the overall query runtime performance must be measured.
In this paper, we address this challenge by presenting novel evaluation metrics
targeted at a fine-grained benchmarking of cost-based federated SPARQL query engines.
We evaluate five cost-based federated SPARQL query engines using existing as well
as novel evaluation metrics by using LargeRDFBench queries. Our results provide
a detailed analysis of the experimental outcomes that reveal novel insights, useful
for the development of future cost-based federated SPARQL query processing engines."
article_type: original
author:
- first_name: Umair
full_name: Qudus, Umair
id: '83392'
last_name: Qudus
orcid: 0000-0001-6714-8729
- first_name: Muhammad
full_name: Saleem, Muhammad
last_name: Saleem
- first_name: Axel-Cyrille
full_name: Ngonga Ngomo, Axel-Cyrille
id: '65716'
last_name: Ngonga Ngomo
- first_name: Young-Koo
full_name: Lee, Young-Koo
last_name: Lee
citation:
ama: Qudus U, Saleem M, Ngonga Ngomo A-C, Lee Y-K. An Empirical Evaluation of Cost-based
Federated SPARQL Query Processing Engines. Semantic Web. 12(6):843-868.
doi:10.3233/SW-200420
apa: Qudus, U., Saleem, M., Ngonga Ngomo, A.-C., & Lee, Y.-K. (n.d.). An Empirical
Evaluation of Cost-based Federated SPARQL Query Processing Engines. Semantic
Web, 12(6), 843–868. https://doi.org/10.3233/SW-200420
bibtex: '@article{Qudus_Saleem_Ngonga Ngomo_Lee, title={An Empirical Evaluation
of Cost-based Federated SPARQL Query Processing Engines}, volume={12}, DOI={10.3233/SW-200420}, number={6}, journal={Semantic
Web}, publisher={ISO Press}, author={Qudus, Umair and Saleem, Muhammad and Ngonga
Ngomo, Axel-Cyrille and Lee, Young-Koo}, pages={843–868} }'
chicago: 'Qudus, Umair, Muhammad Saleem, Axel-Cyrille Ngonga Ngomo, and Young-Koo
Lee. “An Empirical Evaluation of Cost-Based Federated SPARQL Query Processing
Engines.” Semantic Web 12, no. 6 (n.d.): 843–68. https://doi.org/10.3233/SW-200420.'
ieee: 'U. Qudus, M. Saleem, A.-C. Ngonga Ngomo, and Y.-K. Lee, “An Empirical Evaluation
of Cost-based Federated SPARQL Query Processing Engines,” Semantic Web,
vol. 12, no. 6, pp. 843–868, doi: 10.3233/SW-200420.'
mla: Qudus, Umair, et al. “An Empirical Evaluation of Cost-Based Federated SPARQL
Query Processing Engines.” Semantic Web, vol. 12, no. 6, ISO Press, pp.
843–68, doi:10.3233/SW-200420.
short: U. Qudus, M. Saleem, A.-C. Ngonga Ngomo, Y.-K. Lee, Semantic Web 12 (n.d.)
843–868.
date_created: 2021-10-01T06:52:52Z
date_updated: 2025-09-11T09:50:14Z
ddc:
- '000'
department:
- _id: '574'
doi: 10.3233/SW-200420
file:
- access_level: closed
content_type: application/pdf
creator: uqudus
date_created: 2024-01-13T11:35:53Z
date_updated: 2024-01-13T11:35:53Z
file_id: '50483'
file_name: swj2604.pdf
file_size: 978478
relation: main_file
success: 1
file_date_updated: 2024-01-13T11:35:53Z
has_accepted_license: '1'
intvolume: ' 12'
issue: '6'
keyword:
- SPARQL
- benchmarking
- cost-based
- cost-free
- federated
- querying
language:
- iso: eng
page: 843-868
project:
- _id: '410'
name: 'KnowGraphs: KnowGraphs: Knowledge Graphs at Scale'
publication: Semantic Web
publication_identifier:
issn:
- 2210-4968
publication_status: accepted
publisher: ISO Press
status: public
title: An Empirical Evaluation of Cost-based Federated SPARQL Query Processing Engines
type: journal_article
user_id: '83392'
volume: 12
year: '2021'
...
---
_id: '66219'
author:
- first_name: Christian
full_name: Hakert, Christian
last_name: Hakert
- first_name: Asif Ali
full_name: Khan, Asif Ali
last_name: Khan
- first_name: Kuan-Hsun
full_name: Chen, Kuan-Hsun
last_name: Chen
- first_name: Fazal
full_name: Hameed, Fazal
last_name: Hameed
- first_name: Jeronimo
full_name: Castrillon, Jeronimo
last_name: Castrillon
- first_name: Jian-Jia
full_name: Chen, Jian-Jia
last_name: Chen
citation:
ama: 'Hakert C, Khan AA, Chen K-H, Hameed F, Castrillon J, Chen J-J. BLOwing Trees
to the Ground: Layout Optimization of Decision Trees on Racetrack Memory. In:
2021 58th ACM/IEEE Design Automation Conference (DAC). IEEE; 2021. doi:10.1109/dac18074.2021.9586167'
apa: 'Hakert, C., Khan, A. A., Chen, K.-H., Hameed, F., Castrillon, J., & Chen,
J.-J. (2021). BLOwing Trees to the Ground: Layout Optimization of Decision Trees
on Racetrack Memory. 2021 58th ACM/IEEE Design Automation Conference (DAC).
https://doi.org/10.1109/dac18074.2021.9586167'
bibtex: '@inproceedings{Hakert_Khan_Chen_Hameed_Castrillon_Chen_2021, title={BLOwing
Trees to the Ground: Layout Optimization of Decision Trees on Racetrack Memory},
DOI={10.1109/dac18074.2021.9586167},
booktitle={2021 58th ACM/IEEE Design Automation Conference (DAC)}, publisher={IEEE},
author={Hakert, Christian and Khan, Asif Ali and Chen, Kuan-Hsun and Hameed, Fazal
and Castrillon, Jeronimo and Chen, Jian-Jia}, year={2021} }'
chicago: 'Hakert, Christian, Asif Ali Khan, Kuan-Hsun Chen, Fazal Hameed, Jeronimo
Castrillon, and Jian-Jia Chen. “BLOwing Trees to the Ground: Layout Optimization
of Decision Trees on Racetrack Memory.” In 2021 58th ACM/IEEE Design Automation
Conference (DAC). IEEE, 2021. https://doi.org/10.1109/dac18074.2021.9586167.'
ieee: 'C. Hakert, A. A. Khan, K.-H. Chen, F. Hameed, J. Castrillon, and J.-J. Chen,
“BLOwing Trees to the Ground: Layout Optimization of Decision Trees on Racetrack
Memory,” 2021, doi: 10.1109/dac18074.2021.9586167.'
mla: 'Hakert, Christian, et al. “BLOwing Trees to the Ground: Layout Optimization
of Decision Trees on Racetrack Memory.” 2021 58th ACM/IEEE Design Automation
Conference (DAC), IEEE, 2021, doi:10.1109/dac18074.2021.9586167.'
short: 'C. Hakert, A.A. Khan, K.-H. Chen, F. Hameed, J. Castrillon, J.-J. Chen,
in: 2021 58th ACM/IEEE Design Automation Conference (DAC), IEEE, 2021.'
date_created: 2026-07-03T21:20:46Z
date_updated: 2026-07-05T14:45:27Z
doi: 10.1109/dac18074.2021.9586167
publication: 2021 58th ACM/IEEE Design Automation Conference (DAC)
publication_status: published
publisher: IEEE
status: public
title: 'BLOwing Trees to the Ground: Layout Optimization of Decision Trees on Racetrack
Memory'
type: conference
user_id: '128464'
year: '2021'
...
---
_id: '66216'
abstract:
- lang: eng
text: 'AbstractThe predictive performance of a
machine learning model highly depends on the corresponding hyper-parameter setting.
Hence, hyper-parameter tuning is often indispensable. Normally such tuning requires
the dedicated machine learning model to be trained and evaluated on centralized
data to obtain a performance estimate. However, in a distributed machine learning
scenario, it is not always possible to collect all the data from all nodes due
to privacy concerns or storage limitations. Moreover, if data has to be transferred
through low bandwidth connections it reduces the time available for tuning. Model-Based
Optimization (MBO) is one state-of-the-art method for tuning hyper-parameters
but the application on distributed machine learning models or federated learning
lacks research. This work proposes a framework$$\textit{MODES}$$MODESthat
allows to deploy MBO on resource-constrained distributed embedded systems. Each
node trains an individual model based on its local data. The goal is to optimize
the combined prediction accuracy. The presented framework offers two optimization
modes: (1)$$\textit{MODES}$$MODES-B
considers the whole ensemble as a single black box and optimizes the hyper-parameters
of each individual model jointly, and (2)$$\textit{MODES}$$MODES-I
considers all models as clones of the same black box which allows it to efficiently
parallelize the optimization in a distributed setting. We evaluate$$\textit{MODES}$$MODESby
conducting experiments on the optimization for the hyper-parameters of a random
forest and a multi-layer perceptron. The experimental results demonstrate that,
with an improvement in terms of mean accuracy ($$\textit{MODES}$$MODES-B),
run-time efficiency ($$\textit{MODES}$$MODES-I),
and statistical stability for both modes,$$\textit{MODES}$$MODESoutperforms
the baseline, i.e., carry out tuning with MBO on each node individually with its
local sub-data set.'
author:
- first_name: Junjie
full_name: Shi, Junjie
last_name: Shi
- first_name: Jiang
full_name: Bian, Jiang
last_name: Bian
- first_name: Jakob
full_name: Richter, Jakob
last_name: Richter
- first_name: Kuan-Hsun
full_name: Chen, Kuan-Hsun
last_name: Chen
- first_name: Jörg
full_name: Rahnenführer, Jörg
last_name: Rahnenführer
- first_name: Haoyi
full_name: Xiong, Haoyi
last_name: Xiong
- first_name: Jian-Jia
full_name: Chen, Jian-Jia
last_name: Chen
citation:
ama: 'Shi J, Bian J, Richter J, et al. MODES: model-based optimization on distributed
embedded systems. Machine Learning. 2021;110(6):1527-1547. doi:10.1007/s10994-021-06014-6'
apa: 'Shi, J., Bian, J., Richter, J., Chen, K.-H., Rahnenführer, J., Xiong, H.,
& Chen, J.-J. (2021). MODES: model-based optimization on distributed embedded
systems. Machine Learning, 110(6), 1527–1547. https://doi.org/10.1007/s10994-021-06014-6'
bibtex: '@article{Shi_Bian_Richter_Chen_Rahnenführer_Xiong_Chen_2021, title={MODES:
model-based optimization on distributed embedded systems}, volume={110}, DOI={10.1007/s10994-021-06014-6},
number={6}, journal={Machine Learning}, publisher={Springer Science and Business
Media LLC}, author={Shi, Junjie and Bian, Jiang and Richter, Jakob and Chen, Kuan-Hsun
and Rahnenführer, Jörg and Xiong, Haoyi and Chen, Jian-Jia}, year={2021}, pages={1527–1547}
}'
chicago: 'Shi, Junjie, Jiang Bian, Jakob Richter, Kuan-Hsun Chen, Jörg Rahnenführer,
Haoyi Xiong, and Jian-Jia Chen. “MODES: Model-Based Optimization on Distributed
Embedded Systems.” Machine Learning 110, no. 6 (2021): 1527–47. https://doi.org/10.1007/s10994-021-06014-6.'
ieee: 'J. Shi et al., “MODES: model-based optimization on distributed embedded
systems,” Machine Learning, vol. 110, no. 6, pp. 1527–1547, 2021, doi:
10.1007/s10994-021-06014-6.'
mla: 'Shi, Junjie, et al. “MODES: Model-Based Optimization on Distributed Embedded
Systems.” Machine Learning, vol. 110, no. 6, Springer Science and Business
Media LLC, 2021, pp. 1527–47, doi:10.1007/s10994-021-06014-6.'
short: J. Shi, J. Bian, J. Richter, K.-H. Chen, J. Rahnenführer, H. Xiong, J.-J.
Chen, Machine Learning 110 (2021) 1527–1547.
date_created: 2026-07-03T21:20:17Z
date_updated: 2026-07-05T14:46:07Z
doi: 10.1007/s10994-021-06014-6
intvolume: ' 110'
issue: '6'
language:
- iso: eng
page: 1527-1547
publication: Machine Learning
publication_identifier:
issn:
- 0885-6125
- 1573-0565
publication_status: published
publisher: Springer Science and Business Media LLC
status: public
title: 'MODES: model-based optimization on distributed embedded systems'
type: journal_article
user_id: '128464'
volume: 110
year: '2021'
...
---
_id: '19561'
author:
- first_name: Meinolf
full_name: Sellmann, Meinolf
last_name: Sellmann
- first_name: Kevin
full_name: Tierney, Kevin
last_name: Tierney
citation:
ama: 'Sellmann M, Tierney K. Hyper-parameterized Dialectic Search for Non-linear
Box-Constrained Optimization with Heterogenous Variable Types. In: Lecture
Notes in Computer Science. Cham; 2020. doi:10.1007/978-3-030-53552-0_12'
apa: Sellmann, M., & Tierney, K. (2020). Hyper-parameterized Dialectic Search
for Non-linear Box-Constrained Optimization with Heterogenous Variable Types.
In Lecture Notes in Computer Science. Cham. https://doi.org/10.1007/978-3-030-53552-0_12
bibtex: '@inbook{Sellmann_Tierney_2020, place={Cham}, title={Hyper-parameterized
Dialectic Search for Non-linear Box-Constrained Optimization with Heterogenous
Variable Types}, DOI={10.1007/978-3-030-53552-0_12},
booktitle={Lecture Notes in Computer Science}, author={Sellmann, Meinolf and Tierney,
Kevin}, year={2020} }'
chicago: Sellmann, Meinolf, and Kevin Tierney. “Hyper-Parameterized Dialectic Search
for Non-Linear Box-Constrained Optimization with Heterogenous Variable Types.”
In Lecture Notes in Computer Science. Cham, 2020. https://doi.org/10.1007/978-3-030-53552-0_12.
ieee: M. Sellmann and K. Tierney, “Hyper-parameterized Dialectic Search for Non-linear
Box-Constrained Optimization with Heterogenous Variable Types,” in Lecture
Notes in Computer Science, Cham, 2020.
mla: Sellmann, Meinolf, and Kevin Tierney. “Hyper-Parameterized Dialectic Search
for Non-Linear Box-Constrained Optimization with Heterogenous Variable Types.”
Lecture Notes in Computer Science, 2020, doi:10.1007/978-3-030-53552-0_12.
short: 'M. Sellmann, K. Tierney, in: Lecture Notes in Computer Science, Cham, 2020.'
date_created: 2020-09-18T07:54:06Z
date_updated: 2022-01-06T06:54:07Z
doi: 10.1007/978-3-030-53552-0_12
keyword:
- pc2-ressources
language:
- iso: eng
place: Cham
project:
- _id: '52'
name: Computing Resources Provided by the Paderborn Center for Parallel Computing
publication: Lecture Notes in Computer Science
publication_identifier:
isbn:
- '9783030535513'
- '9783030535520'
issn:
- 0302-9743
- 1611-3349
publication_status: published
status: public
title: Hyper-parameterized Dialectic Search for Non-linear Box-Constrained Optimization
with Heterogenous Variable Types
type: book_chapter
user_id: '61189'
year: '2020'
...
---
_id: '19603'
abstract:
- lang: eng
text: "Micro- and smart grids (MSG) play an important role both for integrating\r\nrenewable
energy sources in conventional electricity grids and for providing\r\npower supply
in remote areas. Modern MSGs are largely driven by power\r\nelectronic converters
due to their high efficiency and flexibility.\r\nNevertheless, controlling MSGs
is a challenging task due to highest\r\nrequirements on energy availability, safety
and voltage quality within a wide\r\nrange of different MSG topologies. This results
in a high demand for\r\ncomprehensive testing of new control concepts during their
development phase\r\nand comparisons with the state of the art in order to ensure
their feasibility.\r\nThis applies in particular to data-driven control approaches
from the field of\r\nreinforcement learning (RL), whose stability and operating
behavior can hardly\r\nbe evaluated a priori. Therefore, the OpenModelica Microgrid
Gym (OMG) package,\r\nan open-source software toolbox for the simulation and control
optimization of\r\nMSGs, is proposed. It is capable of modeling and simulating
arbitrary MSG\r\ntopologies and offers a Python-based interface for plug \\& play
controller\r\ntesting. In particular, the standardized OpenAI Gym interface allows
for easy\r\nRL-based controller integration. Besides the presentation of the OMG
toolbox,\r\napplication examples are highlighted including safe Bayesian optimization
for\r\nlow-level controller tuning."
author:
- first_name: Henrik
full_name: Bode, Henrik
last_name: Bode
- first_name: Stefan Helmut
full_name: Heid, Stefan Helmut
id: '39640'
last_name: Heid
orcid: 0000-0002-9461-7372
- first_name: Daniel
full_name: Weber, Daniel
last_name: Weber
- first_name: Eyke
full_name: Hüllermeier, Eyke
id: '48129'
last_name: Hüllermeier
- first_name: Oliver
full_name: Wallscheid, Oliver
last_name: Wallscheid
citation:
ama: Bode H, Heid SH, Weber D, Hüllermeier E, Wallscheid O. Towards a Scalable and
Flexible Simulation and Testing Environment Toolbox for Intelligent Microgrid
Control. arXiv:200504869. 2020.
apa: Bode, H., Heid, S. H., Weber, D., Hüllermeier, E., & Wallscheid, O. (2020).
Towards a Scalable and Flexible Simulation and Testing Environment Toolbox for
Intelligent Microgrid Control. ArXiv:2005.04869.
bibtex: '@article{Bode_Heid_Weber_Hüllermeier_Wallscheid_2020, title={Towards a
Scalable and Flexible Simulation and Testing Environment Toolbox for Intelligent
Microgrid Control}, journal={arXiv:2005.04869}, author={Bode, Henrik and Heid,
Stefan Helmut and Weber, Daniel and Hüllermeier, Eyke and Wallscheid, Oliver},
year={2020} }'
chicago: Bode, Henrik, Stefan Helmut Heid, Daniel Weber, Eyke Hüllermeier, and Oliver
Wallscheid. “Towards a Scalable and Flexible Simulation and Testing Environment
Toolbox for Intelligent Microgrid Control.” ArXiv:2005.04869, 2020.
ieee: H. Bode, S. H. Heid, D. Weber, E. Hüllermeier, and O. Wallscheid, “Towards
a Scalable and Flexible Simulation and Testing Environment Toolbox for Intelligent
Microgrid Control,” arXiv:2005.04869. 2020.
mla: Bode, Henrik, et al. “Towards a Scalable and Flexible Simulation and Testing
Environment Toolbox for Intelligent Microgrid Control.” ArXiv:2005.04869,
2020.
short: H. Bode, S.H. Heid, D. Weber, E. Hüllermeier, O. Wallscheid, ArXiv:2005.04869
(2020).
date_created: 2020-09-21T10:01:36Z
date_updated: 2022-01-06T06:54:07Z
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/pdf/2005.04869.pdf
oa: '1'
publication: arXiv:2005.04869
status: public
title: Towards a Scalable and Flexible Simulation and Testing Environment Toolbox
for Intelligent Microgrid Control
type: preprint
user_id: '39640'
year: '2020'
...
---
_id: '19606'
abstract:
- lang: eng
text: Mobile shopping apps have been using Augmented Reality (AR) in the last years
to place their products in the environment of the customer. While this is possible
with atomic 3D objects, there is is still a lack in the runtime configuration of
3D object compositions based on user needs and environmental constraints. For
this, we previously developed an approach for model-based AR-assisted product
configuration based on the concept of Dynamic Software Product Lines. In this demonstration
paper, we present the corresponding tool support ProConAR in the form of a Product
Modeler and a Product Configurator. While the Product Modeler is an Angular web
app that splits products (e.g. table) up into atomic parts (e.g. tabletop, table
legs, funnier) and saves it within a configuration model, the Product Configurator
is an Android client that uses the configuration model to place different product
configurations within the environment of the customer. We show technical details
of our ready to use tool-chain ProConAR by describing its implementation and usage
as well as pointing out future research directions.
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. ProConAR: A Tool Support for
Model-based AR Product Configuration. 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_14'
apa: 'Gottschalk, S., Yigitbas, E., Schmidt, E., & Engels, G. (2020). ProConAR:
A Tool Support for Model-based AR Product Configuration. 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_14'
bibtex: '@inproceedings{Gottschalk_Yigitbas_Schmidt_Engels_2020, place={Cham}, series={Lecture
Notes in Computer Science}, title={ProConAR: A Tool Support for Model-based AR
Product Configuration}, volume={12481}, DOI={10.1007/978-3-030-64266-2_14},
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.
“ProConAR: A Tool Support for Model-Based AR Product Configuration.” 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_14.'
ieee: 'S. Gottschalk, E. Yigitbas, E. Schmidt, and G. Engels, “ProConAR: A Tool
Support for Model-based AR Product Configuration,” in Human-Centered Software
Engineering. HCSE 2020, Eindhoven, 2020, vol. 12481.'
mla: 'Gottschalk, Sebastian, et al. “ProConAR: A Tool Support for Model-Based AR
Product Configuration.” Human-Centered Software Engineering. HCSE 2020,
edited by Regina Bernhaupt et al., vol. 12481, Springer, 2020, doi:10.1007/978-3-030-64266-2_14.'
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: 2020-09-21T17:01:11Z
date_updated: 2022-01-06T06:54:07Z
ddc:
- '000'
department:
- _id: '66'
- _id: '534'
doi: 10.1007/978-3-030-64266-2_14
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: 2020-11-30T08:39:18Z
date_updated: 2020-11-30T08:39:18Z
file_id: '20542'
file_name: HCSE20_demo.pdf
file_size: 3913885
relation: main_file
file_date_updated: 2020-11-30T08:39:18Z
has_accepted_license: '1'
intvolume: ' 12481'
keyword:
- Product Configuration
- Augmented Reality
- Model-based
- Tool Support
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
publisher: Springer
series_title: Lecture Notes in Computer Science
status: public
title: 'ProConAR: A Tool Support for Model-based AR Product Configuration'
type: conference
user_id: '47208'
volume: 12481
year: '2020'
...
---
_id: '20164'
abstract:
- lang: eng
text: Upcoming sensing applications (acoustic or video) will have high processing
requirements not satisfiable by a single node or need input from multiple sources
(e.g., speaker localization). Offloading these applications to cloud or mobile
edge is an option, but when running in a wireless senor network (WSN), it might
entail needlessly high data rate and latency. An alternative is to spread processing
inside the WSN, which is particularly attractive if the application comprises
individual components. This scenario is typical for applications like acoustic
signal processing. Mapping components to nodes can be formulated as wireless version
of the NP-hard Virtual Network Embedding (VNE) problem, for which various heuristics
exist. We propose a Reinforcement Learning (RL) framework, which relies on Q-Learning
and uses either Greedy Epsilon or Epsilon Decay for exploration. We compare both
exploration methods to the result of an optimization approach and show empirically
that the RL framework achieves good results in terms of network delay within few
number of steps.
author:
- first_name: Haitham
full_name: Afifi, Haitham
id: '65718'
last_name: Afifi
- first_name: Holger
full_name: Karl, Holger
id: '126'
last_name: Karl
citation:
ama: 'Afifi H, Karl H. Reinforcement Learning for Virtual Network Embedding in Wireless
Sensor Networks. In: 2020 Thirteenth International Workshop on Selected Topics
in Mobile and Wireless Computing (STWiMob’2020). Thessaloniki, Greece; 2020.'
apa: Afifi, H., & Karl, H. (2020). Reinforcement Learning for Virtual Network
Embedding in Wireless Sensor Networks. In 2020 Thirteenth International Workshop
on Selected Topics in Mobile and Wireless Computing (STWiMob’2020). Thessaloniki,
Greece.
bibtex: '@inproceedings{Afifi_Karl_2020, place={Thessaloniki, Greece}, title={Reinforcement
Learning for Virtual Network Embedding in Wireless Sensor Networks}, booktitle={2020
Thirteenth International Workshop on Selected Topics in Mobile and Wireless Computing
(STWiMob’2020)}, author={Afifi, Haitham and Karl, Holger}, year={2020} }'
chicago: Afifi, Haitham, and Holger Karl. “Reinforcement Learning for Virtual Network
Embedding in Wireless Sensor Networks.” In 2020 Thirteenth International Workshop
on Selected Topics in Mobile and Wireless Computing (STWiMob’2020). Thessaloniki,
Greece, 2020.
ieee: H. Afifi and H. Karl, “Reinforcement Learning for Virtual Network Embedding
in Wireless Sensor Networks,” in 2020 Thirteenth International Workshop on
Selected Topics in Mobile and Wireless Computing (STWiMob’2020), 2020.
mla: Afifi, Haitham, and Holger Karl. “Reinforcement Learning for Virtual Network
Embedding in Wireless Sensor Networks.” 2020 Thirteenth International Workshop
on Selected Topics in Mobile and Wireless Computing (STWiMob’2020), 2020.
short: 'H. Afifi, H. Karl, in: 2020 Thirteenth International Workshop on Selected
Topics in Mobile and Wireless Computing (STWiMob’2020), Thessaloniki, Greece,
2020.'
date_created: 2020-10-21T14:41:18Z
date_updated: 2022-01-06T06:54:20Z
language:
- iso: eng
place: Thessaloniki, Greece
project:
- _id: '27'
name: Akustische Sensornetzwerke - Teilprojekt "Verteilte akustische Signalverarbeitung
über funkbasierte Sensornetzwerke
publication: 2020 Thirteenth International Workshop on Selected Topics in Mobile and
Wireless Computing (STWiMob'2020)
status: public
title: Reinforcement Learning for Virtual Network Embedding in Wireless Sensor Networks
type: conference
user_id: '65718'
year: '2020'
...
---
_id: '20233'
abstract:
- lang: eng
text: The challenge of designing new tunable nonlinear dielectric materials with
tailored properties has attracted an increasing amount of interest recently. Herein,
we study the effective nonlinear dielectric response of a stochastic paraelectric-dielectric
composite consisting of equilibrium distributions of circular and partially penetrable
disks (or parallel, infinitely long, identical, partially penetrable, circular
cylinders) of a dielectric phase randomly dispersed in a continuous matrix of
a paraelectric phase. The random microstructures were generated using the Metropolis
Monte Carlo algorithm. The evaluation of the effective permittivity and tunability
were carried out by employing either a Landau thermodynamic model or its Johnson’s
approximation to describe the field-dependent permittivity of the paraelectric
phase and solving continuum-electrostatics equations using finite element calculations.
We reveal that the percolation threshold in this composite governs the critical
behavior of the effective permittivity and tunability. For microstructures below
the percolation threshold, our simulations demonstrate a strong nonlinear behaviour
of the field-dependent effective permittivity and very high tunability that increases
as a function of dielectric phase concentration. Above the percolation threshold,
the effective permittivity shows the tendency to linearization and the tunability
dramatically drops down. The highly reduced permittivity and extraordinarily high
tunability are obtained for the composites with dielectric impenetrable disks
at high concentrations, in which the triggering of the percolation transition
is avoided. The reported results cast light on distinct nonlinear behaviour of
2D and 3D stochastic composites and can guide the design of novel composites with
the controlled morphology and tailored permittivity and tunability.
author:
- first_name: Viktor
full_name: Myroshnychenko, Viktor
id: '46371'
last_name: Myroshnychenko
- first_name: Stanislav
full_name: Smirnov, Stanislav
last_name: Smirnov
- first_name: Pious Mathews Mulavarickal
full_name: Jose, Pious Mathews Mulavarickal
last_name: Jose
- first_name: Christian
full_name: Brosseau, Christian
last_name: Brosseau
- first_name: Jens
full_name: Förstner, Jens
id: '158'
last_name: Förstner
orcid: 0000-0001-7059-9862
citation:
ama: Myroshnychenko V, Smirnov S, Jose PMM, Brosseau C, Förstner J. Nonlinear dielectric
properties of random paraelectric-dielectric composites. Acta Materialia.
2020;203:116432. doi:10.1016/j.actamat.2020.10.051
apa: Myroshnychenko, V., Smirnov, S., Jose, P. M. M., Brosseau, C., & Förstner,
J. (2020). Nonlinear dielectric properties of random paraelectric-dielectric composites.
Acta Materialia, 203, 116432. https://doi.org/10.1016/j.actamat.2020.10.051
bibtex: '@article{Myroshnychenko_Smirnov_Jose_Brosseau_Förstner_2020, title={Nonlinear
dielectric properties of random paraelectric-dielectric composites}, volume={203},
DOI={10.1016/j.actamat.2020.10.051},
journal={Acta Materialia}, author={Myroshnychenko, Viktor and Smirnov, Stanislav
and Jose, Pious Mathews Mulavarickal and Brosseau, Christian and Förstner, Jens},
year={2020}, pages={116432} }'
chicago: 'Myroshnychenko, Viktor, Stanislav Smirnov, Pious Mathews Mulavarickal
Jose, Christian Brosseau, and Jens Förstner. “Nonlinear Dielectric Properties
of Random Paraelectric-Dielectric Composites.” Acta Materialia 203 (2020):
116432. https://doi.org/10.1016/j.actamat.2020.10.051.'
ieee: V. Myroshnychenko, S. Smirnov, P. M. M. Jose, C. Brosseau, and J. Förstner,
“Nonlinear dielectric properties of random paraelectric-dielectric composites,”
Acta Materialia, vol. 203, p. 116432, 2020.
mla: Myroshnychenko, Viktor, et al. “Nonlinear Dielectric Properties of Random Paraelectric-Dielectric
Composites.” Acta Materialia, vol. 203, 2020, p. 116432, doi:10.1016/j.actamat.2020.10.051.
short: V. Myroshnychenko, S. Smirnov, P.M.M. Jose, C. Brosseau, J. Förstner, Acta
Materialia 203 (2020) 116432.
date_created: 2020-10-30T13:51:42Z
date_updated: 2022-01-06T06:54:24Z
ddc:
- '530'
department:
- _id: '61'
- _id: '230'
doi: 10.1016/j.actamat.2020.10.051
file:
- access_level: open_access
content_type: application/pdf
creator: fossie
date_created: 2020-10-30T13:52:58Z
date_updated: 2020-10-30T13:52:58Z
file_id: '20234'
file_name: 2020-10 Myroshnychenko - Acta Material (accepted preprint)_compressed.pdf
file_size: 3934721
relation: main_file
title: (Accepted Preprint)
file_date_updated: 2020-10-30T13:52:58Z
has_accepted_license: '1'
intvolume: ' 203'
language:
- iso: eng
oa: '1'
page: '116432'
project:
- _id: '52'
name: Computing Resources Provided by the Paderborn Center for Parallel Computing
publication: Acta Materialia
publication_identifier:
issn:
- 1359-6454
publication_status: published
status: public
title: Nonlinear dielectric properties of random paraelectric-dielectric composites
type: journal_article
user_id: '158'
volume: 203
year: '2020'
...