[{"year":"2021","citation":{"short":"S.B. Schneider, H. Karl, R. Khalili, A. Hecker, DeepCoMP: Coordinated Multipoint Using Multi-Agent Deep Reinforcement Learning, 2021.","mla":"Schneider, Stefan Balthasar, et al. <i>DeepCoMP: Coordinated Multipoint Using Multi-Agent Deep Reinforcement Learning</i>. 2021.","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} }","apa":"Schneider, S. B., Karl, H., Khalili, R., &#38; Hecker, A. (2021). <i>DeepCoMP: Coordinated Multipoint Using Multi-Agent Deep Reinforcement Learning</i>.","chicago":"Schneider, Stefan Balthasar, Holger Karl, Ramin Khalili, and Artur Hecker. <i>DeepCoMP: Coordinated Multipoint Using Multi-Agent Deep Reinforcement Learning</i>, 2021.","ieee":"S. B. Schneider, H. Karl, R. Khalili, and A. Hecker, <i>DeepCoMP: Coordinated Multipoint Using Multi-Agent Deep Reinforcement Learning</i>. 2021.","ama":"Schneider SB, Karl H, Khalili R, Hecker A. <i>DeepCoMP: Coordinated Multipoint Using Multi-Agent Deep Reinforcement Learning</i>.; 2021."},"has_accepted_license":"1","title":"DeepCoMP: Coordinated Multipoint Using Multi-Agent Deep Reinforcement Learning","date_updated":"2022-11-18T09:59:27Z","oa":"1","date_created":"2022-10-20T16:44:19Z","author":[{"first_name":"Stefan Balthasar","full_name":"Schneider, Stefan Balthasar","id":"35343","orcid":"0000-0001-8210-4011","last_name":"Schneider"},{"first_name":"Holger","id":"126","full_name":"Karl, Holger","last_name":"Karl"},{"full_name":"Khalili, Ramin","last_name":"Khalili","first_name":"Ramin"},{"full_name":"Hecker, Artur","last_name":"Hecker","first_name":"Artur"}],"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."}],"file":[{"relation":"main_file","content_type":"application/pdf","file_size":2521656,"file_name":"preprint.pdf","file_id":"33855","access_level":"open_access","date_updated":"2022-10-20T16:41:10Z","creator":"stschn","date_created":"2022-10-20T16:41:10Z"}],"status":"public","type":"working_paper","ddc":["004"],"keyword":["mobility management","coordinated multipoint","CoMP","cell selection","resource management","reinforcement learning","multi agent","MARL","self-learning","self-adaptation","QoE"],"language":[{"iso":"eng"}],"file_date_updated":"2022-10-20T16:41:10Z","project":[{"name":"SFB 901 - C: SFB 901 - Project Area C","_id":"4"},{"name":"SFB 901 - C4: SFB 901 - Subproject C4","_id":"16"},{"_id":"1","name":"SFB 901: SFB 901"}],"_id":"33854","user_id":"477","department":[{"_id":"75"}]},{"year":"2021","citation":{"ama":"Ichev R, Koren J, Kosi U, Sitar Sustar K, Valentincic A. <i>Cost of Debt for Private Firms Revisited: Voluntary Audits as a Reflection of Risk</i>.; 2021.","ieee":"R. Ichev, J. Koren, U. Kosi, K. Sitar Sustar, and A. Valentincic, <i>Cost of Debt for Private Firms Revisited: Voluntary Audits as a Reflection of Risk</i>. 2021.","chicago":"Ichev, Riste, Jernej Koren, Urska Kosi, Katarina Sitar Sustar, and Aljosa Valentincic. <i>Cost of Debt for Private Firms Revisited: Voluntary Audits as a Reflection of Risk</i>, 2021.","mla":"Ichev, Riste, et al. <i>Cost of Debt for Private Firms Revisited: Voluntary Audits as a Reflection of Risk</i>. 2021.","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} }","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.","apa":"Ichev, R., Koren, J., Kosi, U., Sitar Sustar, K., &#38; Valentincic, A. (2021). <i>Cost of Debt for Private Firms Revisited: Voluntary Audits as a Reflection of Risk</i>."},"title":"Cost of Debt for Private Firms Revisited: Voluntary Audits as a Reflection of Risk","main_file_link":[{"url":"https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3853927"}],"date_updated":"2023-01-18T13:40:40Z","author":[{"first_name":"Riste","full_name":"Ichev, Riste","last_name":"Ichev"},{"first_name":"Jernej","full_name":"Koren, Jernej","last_name":"Koren"},{"last_name":"Kosi","full_name":"Kosi, Urska","id":"54068","first_name":"Urska"},{"last_name":"Sitar Sustar","full_name":"Sitar Sustar, Katarina","first_name":"Katarina"},{"last_name":"Valentincic","full_name":"Valentincic, Aljosa","first_name":"Aljosa"}],"date_created":"2023-01-17T15:03:08Z","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."}],"status":"public","type":"working_paper","keyword":["private firms","voluntary audit","cost of debt","self‐selection bias","risk"],"language":[{"iso":"eng"}],"_id":"37136","user_id":"88603","department":[{"_id":"635"},{"_id":"186"},{"_id":"551"}]},{"title":"Self-Piercing Riveting Using Rivets Made of Stainless Steel with High Strain Hardening","doi":"10.1007/978-3-030-75381-8_124","publisher":"Springer","date_updated":"2026-02-27T10:40:39Z","date_created":"2021-08-04T14:02:32Z","author":[{"first_name":"Benedikt","last_name":"Uhe","full_name":"Uhe, Benedikt","id":"38131"},{"first_name":"Clara-Maria","last_name":"Kuball","full_name":"Kuball, Clara-Maria"},{"first_name":"Marion","full_name":"Merklein, Marion","last_name":"Merklein"},{"first_name":"Gerson","last_name":"Meschut","orcid":"0000-0002-2763-1246","full_name":"Meschut, Gerson","id":"32056"}],"place":"Cham","year":"2021","page":"1495-1506","citation":{"mla":"Uhe, Benedikt, et al. “Self-Piercing Riveting Using Rivets Made of Stainless Steel with High Strain Hardening.” <i>Forming the Future - Proceedings of the 13th International Conference on the Technology of Plasticity. The Minerals, Metals &#38; Materials Series.</i>, edited by Glenn Daehn et al., Springer, 2021, pp. 1495–506, doi:<a href=\"https://doi.org/10.1007/978-3-030-75381-8_124\">10.1007/978-3-030-75381-8_124</a>.","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 &#38; Materials Series., Springer, Cham, 2021, pp. 1495–1506.","bibtex":"@inbook{Uhe_Kuball_Merklein_Meschut_2021, place={Cham}, title={Self-Piercing Riveting Using Rivets Made of Stainless Steel with High Strain Hardening}, DOI={<a href=\"https://doi.org/10.1007/978-3-030-75381-8_124\">10.1007/978-3-030-75381-8_124</a>}, booktitle={Forming the Future - Proceedings of the 13th International Conference on the Technology of Plasticity. The Minerals, Metals &#38; 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} }","apa":"Uhe, B., Kuball, C.-M., Merklein, M., &#38; 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, &#38; Y. Yoshida (Eds.), <i>Forming the Future - Proceedings of the 13th International Conference on the Technology of Plasticity. The Minerals, Metals &#38; Materials Series.</i> (pp. 1495–1506). Springer. <a href=\"https://doi.org/10.1007/978-3-030-75381-8_124\">https://doi.org/10.1007/978-3-030-75381-8_124</a>","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. <i>Forming the Future - Proceedings of the 13th International Conference on the Technology of Plasticity. The Minerals, Metals &#38; Materials Series.</i> Springer; 2021:1495-1506. doi:<a href=\"https://doi.org/10.1007/978-3-030-75381-8_124\">10.1007/978-3-030-75381-8_124</a>","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 <i>Forming the Future - Proceedings of the 13th International Conference on the Technology of Plasticity. The Minerals, Metals &#38; Materials Series.</i>, G. Daehn, J. Cao, B. Kinsey, E. Tekkaya, A. Vivek, and Y. Yoshida, Eds. Cham: Springer, 2021, pp. 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 <i>Forming the Future - Proceedings of the 13th International Conference on the Technology of Plasticity. The Minerals, Metals &#38; Materials Series.</i>, edited by Glenn Daehn, Jian Cao, Brad Kinsey, Erman Tekkaya, Anupam Vivek, and Yoshinori Yoshida, 1495–1506. Cham: Springer, 2021. <a href=\"https://doi.org/10.1007/978-3-030-75381-8_124\">https://doi.org/10.1007/978-3-030-75381-8_124</a>."},"quality_controlled":"1","publication_status":"published","keyword":["Self-piercing riveting","Lightweight design","Deformation behaviour","Stainless steel","High nitrogen steel"],"language":[{"iso":"eng"}],"_id":"22930","department":[{"_id":"157"}],"user_id":"53912","editor":[{"last_name":"Daehn","full_name":"Daehn, Glenn","first_name":"Glenn"},{"last_name":"Cao","full_name":"Cao, Jian","first_name":"Jian"},{"first_name":"Brad","last_name":"Kinsey","full_name":"Kinsey, Brad"},{"last_name":"Tekkaya","full_name":"Tekkaya, Erman","first_name":"Erman"},{"first_name":"Anupam","last_name":"Vivek","full_name":"Vivek, Anupam"},{"last_name":"Yoshida","full_name":"Yoshida, Yoshinori","first_name":"Yoshinori"}],"abstract":[{"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.","lang":"eng"}],"status":"public","publication":"Forming the Future - Proceedings of the 13th International Conference on the Technology of Plasticity. The Minerals, Metals & Materials Series.","type":"book_chapter"},{"quality_controlled":"1","citation":{"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. <a href=\"https://doi.org/10.25518/esaform21.1911\">https://doi.org/10.25518/esaform21.1911</a>.","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: <a href=\"https://doi.org/10.25518/esaform21.1911\">10.25518/esaform21.1911</a>.","apa":"Uhe, B., Kuball, C.-M., Merklein, M., &#38; Meschut, G. (2021). <i>Strength of self-piercing riveted Joints with conventional Rivets and Rivets made of High Nitrogen Steel</i>. 24th International Conference on Material Forming (ESAFORM), Liège, Belgien. <a href=\"https://doi.org/10.25518/esaform21.1911\">https://doi.org/10.25518/esaform21.1911</a>","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:<a href=\"https://doi.org/10.25518/esaform21.1911\">10.25518/esaform21.1911</a>","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={<a href=\"https://doi.org/10.25518/esaform21.1911\">10.25518/esaform21.1911</a>}, author={Uhe, Benedikt and Kuball, Clara-Maria and Merklein, Marion and Meschut, Gerson}, year={2021} }","short":"B. Uhe, C.-M. Kuball, M. Merklein, G. Meschut, in: 2021.","mla":"Uhe, Benedikt, et al. <i>Strength of Self-Piercing Riveted Joints with Conventional Rivets and Rivets Made of High Nitrogen Steel</i>. 2021, doi:<a href=\"https://doi.org/10.25518/esaform21.1911\">10.25518/esaform21.1911</a>."},"year":"2021","author":[{"last_name":"Uhe","id":"38131","full_name":"Uhe, Benedikt","first_name":"Benedikt"},{"last_name":"Kuball","full_name":"Kuball, Clara-Maria","first_name":"Clara-Maria"},{"first_name":"Marion","full_name":"Merklein, Marion","last_name":"Merklein"},{"full_name":"Meschut, Gerson","id":"32056","last_name":"Meschut","orcid":"0000-0002-2763-1246","first_name":"Gerson"}],"date_created":"2021-05-31T10:17:37Z","date_updated":"2026-02-27T10:25:13Z","conference":{"name":"24th International Conference on Material Forming (ESAFORM)","start_date":"2021-04-14","end_date":"2021-04-16","location":"Liège, Belgien"},"doi":"10.25518/esaform21.1911","title":"Strength of self-piercing riveted Joints with conventional Rivets and Rivets made of High Nitrogen Steel","type":"conference","status":"public","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. "}],"department":[{"_id":"157"}],"user_id":"53912","_id":"22274","language":[{"iso":"eng"}],"keyword":["Self-piercing Riveting","Joining Technology","Rivet Geometry","Rivet Material","High Nitrogen Steel","Joint Strength"]},{"year":"2021","issue":"2","title":"The digital home learning environment and its relation to children’s ICT self-efficacy","date_created":"2022-08-03T05:53:48Z","publisher":"Springer Science and Business Media LLC","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."}],"publication":"Learning Environments Research","language":[{"iso":"eng"}],"keyword":["Digital media use","Gender","Home learning environment","ICT self-efcacy","Motivation","Parental involvement"],"citation":{"ama":"Bonanati S, Buhl HM. The digital home learning environment and its relation to children’s ICT self-efficacy. <i>Learning Environments Research</i>. 2021;25(2):485-505. doi:<a href=\"https://doi.org/10.1007/s10984-021-09377-8\">10.1007/s10984-021-09377-8</a>","ieee":"S. Bonanati and H. M. Buhl, “The digital home learning environment and its relation to children’s ICT self-efficacy,” <i>Learning Environments Research</i>, vol. 25, no. 2, pp. 485–505, 2021, doi: <a href=\"https://doi.org/10.1007/s10984-021-09377-8\">10.1007/s10984-021-09377-8</a>.","chicago":"Bonanati, Sabrina, and Heike M. Buhl. “The Digital Home Learning Environment and Its Relation to Children’s ICT Self-Efficacy.” <i>Learning Environments Research</i> 25, no. 2 (2021): 485–505. <a href=\"https://doi.org/10.1007/s10984-021-09377-8\">https://doi.org/10.1007/s10984-021-09377-8</a>.","bibtex":"@article{Bonanati_Buhl_2021, title={The digital home learning environment and its relation to children’s ICT self-efficacy}, volume={25}, DOI={<a href=\"https://doi.org/10.1007/s10984-021-09377-8\">10.1007/s10984-021-09377-8</a>}, 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} }","mla":"Bonanati, Sabrina, and Heike M. Buhl. “The Digital Home Learning Environment and Its Relation to Children’s ICT Self-Efficacy.” <i>Learning Environments Research</i>, vol. 25, no. 2, Springer Science and Business Media LLC, 2021, pp. 485–505, doi:<a href=\"https://doi.org/10.1007/s10984-021-09377-8\">10.1007/s10984-021-09377-8</a>.","short":"S. Bonanati, H.M. Buhl, Learning Environments Research 25 (2021) 485–505.","apa":"Bonanati, S., &#38; Buhl, H. M. (2021). The digital home learning environment and its relation to children’s ICT self-efficacy. <i>Learning Environments Research</i>, <i>25</i>(2), 485–505. <a href=\"https://doi.org/10.1007/s10984-021-09377-8\">https://doi.org/10.1007/s10984-021-09377-8</a>"},"intvolume":"        25","page":"485-505","publication_status":"published","publication_identifier":{"issn":["1387-1579","1573-1855"]},"main_file_link":[{"url":"https://link.springer.com/content/pdf/10.1007/s10984-021-09377-8.pdf","open_access":"1"}],"doi":"10.1007/s10984-021-09377-8","author":[{"last_name":"Bonanati","full_name":"Bonanati, Sabrina","first_name":"Sabrina"},{"id":"27152","full_name":"Buhl, Heike M.","last_name":"Buhl","first_name":"Heike M."}],"volume":25,"date_updated":"2025-07-16T08:38:51Z","oa":"1","status":"public","type":"journal_article","user_id":"27152","department":[{"_id":"427"}],"project":[{"grant_number":"01JD1814A","_id":"378","name":"DigHomE: DigHomE: Digital Home Learning Environment – Gelingensbedingungen elterlicher Unterstützung bei der informationsorientierten Internetnutzung"}],"_id":"32558"},{"type":"conference","status":"public","department":[{"_id":"75"}],"user_id":"35343","_id":"19609","project":[{"_id":"1","name":"SFB 901"},{"name":"SFB 901 - Project Area C","_id":"4"},{"name":"SFB 901 - Subproject C4","_id":"16"}],"file_date_updated":"2020-09-22T06:36:00Z","has_accepted_license":"1","citation":{"apa":"Schneider, S. B., Manzoor, A., Qarawlus, H., Schellenberg, R., Karl, H., Khalili, R., &#38; Hecker, A. (2020). Self-Driving Network and Service Coordination Using Deep Reinforcement Learning. In <i>IEEE International Conference on Network and Service Management (CNSM)</i>. IEEE.","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.","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} }","mla":"Schneider, Stefan Balthasar, et al. “Self-Driving Network and Service Coordination Using Deep Reinforcement Learning.” <i>IEEE International Conference on Network and Service Management (CNSM)</i>, IEEE, 2020.","ama":"Schneider SB, Manzoor A, Qarawlus H, et al. Self-Driving Network and Service Coordination Using Deep Reinforcement Learning. In: <i>IEEE International Conference on Network and Service Management (CNSM)</i>. IEEE; 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 <i>IEEE International Conference on Network and Service Management (CNSM)</i>. IEEE, 2020.","ieee":"S. B. Schneider <i>et al.</i>, “Self-Driving Network and Service Coordination Using Deep Reinforcement Learning,” in <i>IEEE International Conference on Network and Service Management (CNSM)</i>, 2020."},"author":[{"first_name":"Stefan Balthasar","full_name":"Schneider, Stefan Balthasar","id":"35343","last_name":"Schneider","orcid":"0000-0001-8210-4011"},{"full_name":"Manzoor, Adnan","last_name":"Manzoor","first_name":"Adnan"},{"full_name":"Qarawlus, Haydar","last_name":"Qarawlus","first_name":"Haydar"},{"first_name":"Rafael","last_name":"Schellenberg","full_name":"Schellenberg, Rafael"},{"first_name":"Holger","last_name":"Karl","id":"126","full_name":"Karl, Holger"},{"first_name":"Ramin","last_name":"Khalili","full_name":"Khalili, Ramin"},{"last_name":"Hecker","full_name":"Hecker, Artur","first_name":"Artur"}],"oa":"1","date_updated":"2022-01-06T06:54:08Z","publication":"IEEE International Conference on Network and Service Management (CNSM)","file":[{"relation":"main_file","content_type":"application/pdf","access_level":"open_access","file_name":"ris_with_copyright.pdf","file_id":"19610","file_size":642999,"date_created":"2020-09-22T06:29:16Z","creator":"stschn","date_updated":"2020-09-22T06:36:00Z"}],"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."}],"language":[{"iso":"eng"}],"keyword":["self-driving networks","self-learning","network coordination","service coordination","reinforcement learning","deep learning","nfv"],"ddc":["006"],"year":"2020","date_created":"2020-09-22T06:28:22Z","publisher":"IEEE","title":"Self-Driving Network and Service Coordination Using Deep Reinforcement Learning"},{"date_updated":"2022-04-25T07:49:50Z","oa":"1","publisher":"Elsevier","author":[{"last_name":"Otroshi","orcid":"0000-0002-8652-9209","id":"71269","full_name":"Otroshi, Mortaza","first_name":"Mortaza"},{"last_name":"Rossel","full_name":"Rossel, Moritz","first_name":"Moritz"},{"orcid":"0000-0002-2763-1246","last_name":"Meschut","full_name":"Meschut, Gerson","id":"32056","first_name":"Gerson"}],"date_created":"2020-10-20T14:49:15Z","volume":1,"title":"Stress state dependent damage modeling of self-pierce riveting process simulation using GISSMO damage model","main_file_link":[{"open_access":"1"}],"doi":"10.1016/j.jajp.2020.100015","quality_controlled":"1","year":"2020","citation":{"short":"M. Otroshi, M. Rossel, G. Meschut, Journal of Advanced Joining Processes 1 (2020).","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={<a href=\"https://doi.org/10.1016/j.jajp.2020.100015\">10.1016/j.jajp.2020.100015</a>}, journal={Journal of Advanced Joining Processes}, publisher={Elsevier}, author={Otroshi, Mortaza and Rossel, Moritz and Meschut, Gerson}, year={2020} }","mla":"Otroshi, Mortaza, et al. “Stress State Dependent Damage Modeling of Self-Pierce Riveting Process Simulation Using GISSMO Damage Model.” <i>Journal of Advanced Joining Processes</i>, vol. 1, Elsevier, 2020, doi:<a href=\"https://doi.org/10.1016/j.jajp.2020.100015\">10.1016/j.jajp.2020.100015</a>.","apa":"Otroshi, M., Rossel, M., &#38; Meschut, G. (2020). Stress state dependent damage modeling of self-pierce riveting process simulation using GISSMO damage model. <i>Journal of Advanced Joining Processes</i>, <i>1</i>. <a href=\"https://doi.org/10.1016/j.jajp.2020.100015\">https://doi.org/10.1016/j.jajp.2020.100015</a>","ama":"Otroshi M, Rossel M, Meschut G. Stress state dependent damage modeling of self-pierce riveting process simulation using GISSMO damage model. <i>Journal of Advanced Joining Processes</i>. 2020;1. doi:<a href=\"https://doi.org/10.1016/j.jajp.2020.100015\">10.1016/j.jajp.2020.100015</a>","chicago":"Otroshi, Mortaza, Moritz Rossel, and Gerson Meschut. “Stress State Dependent Damage Modeling of Self-Pierce Riveting Process Simulation Using GISSMO Damage Model.” <i>Journal of Advanced Joining Processes</i> 1 (2020). <a href=\"https://doi.org/10.1016/j.jajp.2020.100015\">https://doi.org/10.1016/j.jajp.2020.100015</a>.","ieee":"M. Otroshi, M. Rossel, and G. Meschut, “Stress state dependent damage modeling of self-pierce riveting process simulation using GISSMO damage model,” <i>Journal of Advanced Joining Processes</i>, vol. 1, 2020, doi: <a href=\"https://doi.org/10.1016/j.jajp.2020.100015\">10.1016/j.jajp.2020.100015</a>."},"intvolume":"         1","_id":"20143","user_id":"71269","department":[{"_id":"157"}],"keyword":["Self-pierce riveting","Ductile fracture","Damage modeling","GISSMO damage model"],"language":[{"iso":"eng"}],"type":"journal_article","publication":"Journal of Advanced Joining Processes","status":"public"},{"intvolume":"         3","page":"18-33","citation":{"ama":"Caruso C, Adammek C, Bonanati S, Wiescholek S. Motivierende Lernzugänge als Ausgangspunkt der Professionalisierung angehender Lehrer_innen. <i>Herausforderung Lehrer*innenbildung - Zeitschrift Zur Konzeption, Gestaltung Und Diskussion</i>. 2020;3(1):18-33. doi:<a href=\"https://doi.org/10.4119/hlz-2540\">10.4119/hlz-2540</a>","ieee":"C. Caruso, C. Adammek, S. Bonanati, and S. Wiescholek, “Motivierende Lernzugänge als Ausgangspunkt der Professionalisierung angehender Lehrer_innen,” <i>Herausforderung Lehrer*innenbildung - Zeitschrift Zur Konzeption, Gestaltung Und Diskussion</i>, vol. 3, no. 1, pp. 18–33, 2020, doi: <a href=\"https://doi.org/10.4119/hlz-2540\">10.4119/hlz-2540</a>.","chicago":"Caruso, Carina, Christine Adammek, Sabrina Bonanati, and Sybille Wiescholek. “Motivierende Lernzugänge als Ausgangspunkt der Professionalisierung angehender Lehrer_innen.” <i>Herausforderung Lehrer*innenbildung - Zeitschrift Zur Konzeption, Gestaltung Und Diskussion</i> 3, no. 1 (2020): 18–33. <a href=\"https://doi.org/10.4119/hlz-2540\">https://doi.org/10.4119/hlz-2540</a>.","bibtex":"@article{Caruso_Adammek_Bonanati_Wiescholek_2020, title={Motivierende Lernzugänge als Ausgangspunkt der Professionalisierung angehender Lehrer_innen}, volume={3}, DOI={<a href=\"https://doi.org/10.4119/hlz-2540\">10.4119/hlz-2540</a>}, 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} }","mla":"Caruso, Carina, et al. “Motivierende Lernzugänge als Ausgangspunkt der Professionalisierung angehender Lehrer_innen.” <i>Herausforderung Lehrer*innenbildung - Zeitschrift Zur Konzeption, Gestaltung Und Diskussion</i>, vol. 3, no. 1, 2020, pp. 18–33, doi:<a href=\"https://doi.org/10.4119/hlz-2540\">10.4119/hlz-2540</a>.","short":"C. Caruso, C. Adammek, S. Bonanati, S. Wiescholek, Herausforderung Lehrer*innenbildung - Zeitschrift Zur Konzeption, Gestaltung Und Diskussion 3 (2020) 18–33.","apa":"Caruso, C., Adammek, C., Bonanati, S., &#38; Wiescholek, S. (2020). Motivierende Lernzugänge als Ausgangspunkt der Professionalisierung angehender Lehrer_innen. <i>Herausforderung Lehrer*innenbildung - Zeitschrift Zur Konzeption, Gestaltung Und Diskussion</i>, <i>3</i>(1), 18–33. <a href=\"https://doi.org/10.4119/hlz-2540\">https://doi.org/10.4119/hlz-2540</a>"},"year":"2020","issue":"1","publication_identifier":{"issn":["2625-0675"]},"publication_status":"published","doi":"10.4119/hlz-2540","title":"Motivierende Lernzugänge als Ausgangspunkt der Professionalisierung angehender Lehrer_innen","volume":3,"author":[{"first_name":"Carina","last_name":"Caruso","id":"23123","full_name":"Caruso, Carina"},{"first_name":"Christine","last_name":"Adammek","full_name":"Adammek, Christine"},{"first_name":"Sabrina","last_name":"Bonanati","full_name":"Bonanati, Sabrina"},{"last_name":"Wiescholek","full_name":"Wiescholek, Sybille","first_name":"Sybille"}],"date_created":"2023-01-05T13:58:28Z","date_updated":"2023-01-06T12:18:16Z","status":"public","abstract":[{"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":"ger"},{"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.","lang":"eng"}],"publication":"Herausforderung Lehrer*innenbildung - Zeitschrift Zur Konzeption, Gestaltung Und Diskussion","type":"journal_article","language":[{"iso":"other"}],"alternative_title":["Ein Blick auf kompetenzorientiertes, ästhetisches und biographisches Lernen im Lehramtsstudium"],"keyword":["ästhetische Forschung","Biographiearbeit","Praxissemester","Professionalisierung","selbstreguliertes Lernen","Motivation / aesthetic research","biographical work","long-term internship","profes-sionalization","self-regulated learning","motivation"],"user_id":"86519","_id":"35298"},{"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."}],"editor":[{"last_name":"Kuball","full_name":"Kuball, Clara-Maria","first_name":"Clara-Maria"},{"last_name":"Uhe","full_name":"Uhe, Benedikt","id":"38131","first_name":"Benedikt"},{"id":"32056","full_name":"Meschut, Gerson","orcid":"0000-0002-2763-1246","last_name":"Meschut","first_name":"Gerson"},{"first_name":"Marion","full_name":"Merklein, Marion","last_name":"Merklein"}],"status":"public","type":"conference_editor","keyword":["high nitrogen steel","self-piercing riveting","joining by forming","bulk forming","tool design"],"language":[{"iso":"eng"}],"_id":"19976","user_id":"53912","series_title":"Procedia Manufacturing","department":[{"_id":"157"}],"year":"2020","citation":{"ieee":"C.-M. Kuball, B. Uhe, G. Meschut, and M. Merklein, Eds., <i>Process design for the forming of semi-tubular self-piercing rivets made of high nitrogen steel</i>, vol. 50. 2020, pp. 280–285.","chicago":"Kuball, Clara-Maria, Benedikt Uhe, Gerson Meschut, and Marion Merklein, eds. <i>Process Design for the Forming of Semi-Tubular Self-Piercing Rivets Made of High Nitrogen Steel</i>. Vol. 50. Procedia Manufacturing, 2020. <a href=\"https://doi.org/10.1016/j.promfg.2020.08.052\">https://doi.org/10.1016/j.promfg.2020.08.052</a>.","ama":"Kuball C-M, Uhe B, Meschut G, Merklein M, eds. <i>Process Design for the Forming of Semi-Tubular Self-Piercing Rivets Made of High Nitrogen Steel</i>. Vol 50.; 2020:280-285. doi:<a href=\"https://doi.org/10.1016/j.promfg.2020.08.052\">10.1016/j.promfg.2020.08.052</a>","apa":"Kuball, C.-M., Uhe, B., Meschut, G., &#38; Merklein, M. (Eds.). (2020). <i>Process design for the forming of semi-tubular self-piercing rivets made of high nitrogen steel</i> (Vol. 50, pp. 280–285). <a href=\"https://doi.org/10.1016/j.promfg.2020.08.052\">https://doi.org/10.1016/j.promfg.2020.08.052</a>","mla":"Kuball, Clara-Maria, et al., editors. <i>Process Design for the Forming of Semi-Tubular Self-Piercing Rivets Made of High Nitrogen Steel</i>. 2020, pp. 280–85, doi:<a href=\"https://doi.org/10.1016/j.promfg.2020.08.052\">10.1016/j.promfg.2020.08.052</a>.","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={<a href=\"https://doi.org/10.1016/j.promfg.2020.08.052\">10.1016/j.promfg.2020.08.052</a>}, year={2020}, pages={280–285}, collection={Procedia Manufacturing} }","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."},"page":"280-285","intvolume":"        50","publication_status":"published","quality_controlled":"1","title":"Process design for the forming of semi-tubular self-piercing rivets made of high nitrogen steel","doi":"10.1016/j.promfg.2020.08.052","date_updated":"2026-02-27T10:43:48Z","date_created":"2020-10-12T08:30:08Z","volume":50},{"publication":"Production Engineering","type":"journal_article","abstract":[{"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.","lang":"eng"}],"status":"public","_id":"19973","department":[{"_id":"157"}],"user_id":"53912","keyword":["Self-piercing riveting","Joining technology","Rivet geometry","Multi-material design","High-strength steel","Aluminium"],"article_type":"original","language":[{"iso":"eng"}],"quality_controlled":"1","publication_status":"published","year":"2020","intvolume":"        14","page":"417-423","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. <i>Production Engineering</i>. 2020;14:417-423. doi:<a href=\"https://doi.org/10.1007/s11740-020-00973-w\">10.1007/s11740-020-00973-w</a>","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.” <i>Production Engineering</i> 14 (2020): 417–23. <a href=\"https://doi.org/10.1007/s11740-020-00973-w\">https://doi.org/10.1007/s11740-020-00973-w</a>.","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,” <i>Production Engineering</i>, vol. 14, pp. 417–423, 2020, doi: <a href=\"https://doi.org/10.1007/s11740-020-00973-w\">10.1007/s11740-020-00973-w</a>.","apa":"Uhe, B., Kuball, C.-M., Merklein, M., &#38; Meschut, G. (2020). Improvement of a rivet geometry for the self-piercing riveting of high-strength steel and multi-material joints. <i>Production Engineering</i>, <i>14</i>, 417–423. <a href=\"https://doi.org/10.1007/s11740-020-00973-w\">https://doi.org/10.1007/s11740-020-00973-w</a>","mla":"Uhe, Benedikt, et al. “Improvement of a Rivet Geometry for the Self-Piercing Riveting of High-Strength Steel and Multi-Material Joints.” <i>Production Engineering</i>, vol. 14, 2020, pp. 417–23, doi:<a href=\"https://doi.org/10.1007/s11740-020-00973-w\">10.1007/s11740-020-00973-w</a>.","short":"B. Uhe, C.-M. Kuball, M. Merklein, G. Meschut, Production Engineering 14 (2020) 417–423.","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={<a href=\"https://doi.org/10.1007/s11740-020-00973-w\">10.1007/s11740-020-00973-w</a>}, journal={Production Engineering}, author={Uhe, Benedikt and Kuball, Clara-Maria and Merklein, Marion and Meschut, Gerson}, year={2020}, pages={417–423} }"},"date_updated":"2026-02-27T10:41:55Z","volume":14,"author":[{"first_name":"Benedikt","id":"38131","full_name":"Uhe, Benedikt","last_name":"Uhe"},{"first_name":"Clara-Maria","last_name":"Kuball","full_name":"Kuball, Clara-Maria"},{"first_name":"Marion","last_name":"Merklein","full_name":"Merklein, Marion"},{"first_name":"Gerson","full_name":"Meschut, Gerson","id":"32056","orcid":"0000-0002-2763-1246","last_name":"Meschut"}],"date_created":"2020-10-12T08:14:13Z","title":"Improvement of a rivet geometry for the self-piercing riveting of high-strength steel and multi-material joints","doi":"10.1007/s11740-020-00973-w"},{"article_number":"100023","keyword":["High nitrogen steel","Self-piercing riveting","Joining by forming","Bulk forming","Strain hardening"],"language":[{"iso":"eng"}],"_id":"19974","user_id":"53912","series_title":"Journal of Advanced Joining Processes","department":[{"_id":"157"}],"editor":[{"first_name":"Clara-Maria","last_name":"Kuball","full_name":"Kuball, Clara-Maria"},{"last_name":"Jung","full_name":"Jung, R","first_name":"R"},{"first_name":"Benedikt","id":"38131","full_name":"Uhe, Benedikt","last_name":"Uhe"},{"id":"32056","full_name":"Meschut, Gerson","orcid":"0000-0002-2763-1246","last_name":"Meschut","first_name":"Gerson"},{"last_name":"Merklein","full_name":"Merklein, Marion","first_name":"Marion"}],"abstract":[{"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.","lang":"eng"}],"status":"public","type":"conference_editor","title":"Influence of the process temperature on the forming behaviour and the friction during bulk forming of high nitrogen steel","doi":"10.1016/j.jajp.2020.100023","date_updated":"2026-02-27T10:45:08Z","date_created":"2020-10-12T08:23:27Z","volume":1,"year":"2020","citation":{"ama":"Kuball C-M, Jung R, Uhe B, Meschut G, Merklein M, eds. <i>Influence of the Process Temperature on the Forming Behaviour and the Friction during Bulk Forming of High Nitrogen Steel</i>. Vol 1.; 2020. doi:<a href=\"https://doi.org/10.1016/j.jajp.2020.100023\">10.1016/j.jajp.2020.100023</a>","chicago":"Kuball, Clara-Maria, R Jung, Benedikt Uhe, Gerson Meschut, and Marion Merklein, eds. <i>Influence of the Process Temperature on the Forming Behaviour and the Friction during Bulk Forming of High Nitrogen Steel</i>. Vol. 1. Journal of Advanced Joining Processes, 2020. <a href=\"https://doi.org/10.1016/j.jajp.2020.100023\">https://doi.org/10.1016/j.jajp.2020.100023</a>.","ieee":"C.-M. Kuball, R. Jung, B. Uhe, G. Meschut, and M. Merklein, Eds., <i>Influence of the process temperature on the forming behaviour and the friction during bulk forming of high nitrogen steel</i>, vol. 1. 2020.","apa":"Kuball, C.-M., Jung, R., Uhe, B., Meschut, G., &#38; Merklein, M. (Eds.). (2020). <i>Influence of the process temperature on the forming behaviour and the friction during bulk forming of high nitrogen steel</i> (No. 100023; Vol. 1). <a href=\"https://doi.org/10.1016/j.jajp.2020.100023\">https://doi.org/10.1016/j.jajp.2020.100023</a>","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={<a href=\"https://doi.org/10.1016/j.jajp.2020.100023\">10.1016/j.jajp.2020.100023</a>}, number={100023}, year={2020}, collection={Journal of Advanced Joining Processes} }","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.","mla":"Kuball, Clara-Maria, et al., editors. <i>Influence of the Process Temperature on the Forming Behaviour and the Friction during Bulk Forming of High Nitrogen Steel</i>. 100023, 2020, doi:<a href=\"https://doi.org/10.1016/j.jajp.2020.100023\">10.1016/j.jajp.2020.100023</a>."},"intvolume":"         1","publication_status":"published","quality_controlled":"1"},{"type":"dissertation","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."}],"status":"public","_id":"10000","department":[{"_id":"151"}],"user_id":"210","keyword":["Sonochemie","Akustische Kavitation","Kavitationsmessung","Kavitationsdetektion","FEM-Simulation Ultraschallwandler","Prozessüberwachung","FEM-Simulation Schallfeld","Self-Sensing","Piezoelektrische Ultraschallwandler","Ultraschallreinigung"],"language":[{"iso":"eng"}],"year":"2019","citation":{"ama":"Bornmann P. <i>Modellierung Und Experimentelle Charakterisierung Der Wechselwirkung Zwischen Ultraschallwandler Und Flüssigkeit in Kavitationsbasierten Prozessen</i>. Shaker; 2019.","chicago":"Bornmann, Peter. <i>Modellierung Und Experimentelle Charakterisierung Der Wechselwirkung Zwischen Ultraschallwandler Und Flüssigkeit in Kavitationsbasierten Prozessen</i>. Shaker, 2019.","ieee":"P. Bornmann, <i>Modellierung und experimentelle Charakterisierung der Wechselwirkung zwischen Ultraschallwandler und Flüssigkeit in kavitationsbasierten Prozessen</i>. Shaker, 2019.","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} }","short":"P. Bornmann, Modellierung Und Experimentelle Charakterisierung Der Wechselwirkung Zwischen Ultraschallwandler Und Flüssigkeit in Kavitationsbasierten Prozessen, Shaker, 2019.","mla":"Bornmann, Peter. <i>Modellierung Und Experimentelle Charakterisierung Der Wechselwirkung Zwischen Ultraschallwandler Und Flüssigkeit in Kavitationsbasierten Prozessen</i>. Shaker, 2019.","apa":"Bornmann, P. (2019). <i>Modellierung und experimentelle Charakterisierung der Wechselwirkung zwischen Ultraschallwandler und Flüssigkeit in kavitationsbasierten Prozessen</i>. Shaker."},"date_updated":"2023-09-15T12:23:55Z","publisher":"Shaker","date_created":"2019-05-27T10:29:53Z","author":[{"last_name":"Bornmann","full_name":"Bornmann, Peter","first_name":"Peter"}],"title":"Modellierung und experimentelle Charakterisierung der Wechselwirkung zwischen Ultraschallwandler und Flüssigkeit in kavitationsbasierten Prozessen"},{"title":"Oxygen detection with zinc oxide nanoparticle structures","doi":"10.1117/12.2501507","publisher":"SPIE","date_updated":"2025-04-02T11:34:07Z","volume":11043,"date_created":"2025-03-31T16:06:43Z","author":[{"last_name":"Schwabe","full_name":"Schwabe, Tobias","id":"39217","first_name":"Tobias"},{"first_name":"Axel","full_name":"Balke, Axel","last_name":"Balke"},{"first_name":"Petrone H.","full_name":"Bezuidenhout, Petrone H.","last_name":"Bezuidenhout"},{"last_name":"Reker","full_name":"Reker, Julia","first_name":"Julia"},{"full_name":"Meyers, Thorsten","last_name":"Meyers","first_name":"Thorsten"},{"first_name":"Trudi-Heleen","last_name":"Joubert","full_name":"Joubert, Trudi-Heleen"},{"last_name":"Hilleringmann","full_name":"Hilleringmann, Ulrich","id":"20179","first_name":"Ulrich"}],"year":"2019","page":"1104316","intvolume":"     11043","citation":{"apa":"Schwabe, T., Balke, A., Bezuidenhout, P. H., Reker, J., Meyers, T., Joubert, T.-H., &#38; Hilleringmann, U. (2019). Oxygen detection with zinc oxide nanoparticle structures. In M. du Plessis (Ed.), <i>Fifth Conference on Sensors, MEMS, and Electro-Optic Systems</i> (Vol. 11043, p. 1104316). SPIE. <a href=\"https://doi.org/10.1117/12.2501507\">https://doi.org/10.1117/12.2501507</a>","bibtex":"@inproceedings{Schwabe_Balke_Bezuidenhout_Reker_Meyers_Joubert_Hilleringmann_2019, title={Oxygen detection with zinc oxide nanoparticle structures}, volume={11043}, DOI={<a href=\"https://doi.org/10.1117/12.2501507\">10.1117/12.2501507</a>}, booktitle={Fifth Conference on Sensors, MEMS, and Electro-Optic Systems}, publisher={SPIE}, author={Schwabe, Tobias and Balke, Axel and Bezuidenhout, Petrone H. and Reker, Julia and Meyers, Thorsten and Joubert, Trudi-Heleen and Hilleringmann, Ulrich}, editor={du Plessis, Monuko}, year={2019}, pages={1104316} }","mla":"Schwabe, Tobias, et al. “Oxygen Detection with Zinc Oxide Nanoparticle Structures.” <i>Fifth Conference on Sensors, MEMS, and Electro-Optic Systems</i>, edited by Monuko du Plessis, vol. 11043, SPIE, 2019, p. 1104316, doi:<a href=\"https://doi.org/10.1117/12.2501507\">10.1117/12.2501507</a>.","short":"T. Schwabe, A. Balke, P.H. Bezuidenhout, J. Reker, T. Meyers, T.-H. Joubert, U. Hilleringmann, in: M. du Plessis (Ed.), Fifth Conference on Sensors, MEMS, and Electro-Optic Systems, SPIE, 2019, p. 1104316.","chicago":"Schwabe, Tobias, Axel Balke, Petrone H. Bezuidenhout, Julia Reker, Thorsten Meyers, Trudi-Heleen Joubert, and Ulrich Hilleringmann. “Oxygen Detection with Zinc Oxide Nanoparticle Structures.” In <i>Fifth Conference on Sensors, MEMS, and Electro-Optic Systems</i>, edited by Monuko du Plessis, 11043:1104316. SPIE, 2019. <a href=\"https://doi.org/10.1117/12.2501507\">https://doi.org/10.1117/12.2501507</a>.","ieee":"T. Schwabe <i>et al.</i>, “Oxygen detection with zinc oxide nanoparticle structures,” in <i>Fifth Conference on Sensors, MEMS, and Electro-Optic Systems</i>, 2019, vol. 11043, p. 1104316, doi: <a href=\"https://doi.org/10.1117/12.2501507\">10.1117/12.2501507</a>.","ama":"Schwabe T, Balke A, Bezuidenhout PH, et al. Oxygen detection with zinc oxide nanoparticle structures. In: du Plessis M, ed. <i>Fifth Conference on Sensors, MEMS, and Electro-Optic Systems</i>. Vol 11043. SPIE; 2019:1104316. doi:<a href=\"https://doi.org/10.1117/12.2501507\">10.1117/12.2501507</a>"},"keyword":["sensing","zinc oxide","thin-film transistor","oxygen measurement","low-cost electronics","water quality analysis","printable electronics","flexible electronics"],"language":[{"iso":"eng"}],"_id":"59220","user_id":"39217","editor":[{"first_name":"Monuko","last_name":"du Plessis","full_name":"du Plessis, Monuko"}],"status":"public","publication":"Fifth Conference on Sensors, MEMS, and Electro-Optic Systems","type":"conference"},{"external_id":{"arxiv":["1710.08128"]},"language":[{"iso":"eng"}],"keyword":["Topological Self-stabilization","Supervised Overlay","Publish-Subscribe System"],"ddc":["040"],"publication":"Proceedings of the 32nd IEEE International Parallel & Distributed Processing Symposium (IPDPS)","file":[{"date_created":"2018-10-31T13:25:37Z","creator":"mfeldma2","date_updated":"2018-10-31T13:25:37Z","file_id":"5211","file_name":"08425258.pdf","access_level":"closed","file_size":239559,"content_type":"application/pdf","relation":"main_file","success":1}],"abstract":[{"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","lang":"eng"}],"date_created":"2018-02-01T13:56:01Z","publisher":"IEEE","title":"Self-Stabilizing Supervised Publish-Subscribe Systems","year":"2018","department":[{"_id":"79"},{"_id":"66"}],"user_id":"11319","_id":"1163","project":[{"_id":"1","name":"SFB 901"},{"name":"SFB 901 - Project Area A","_id":"2"},{"name":"SFB 901 - Subproject A1","_id":"5"}],"file_date_updated":"2018-10-31T13:25:37Z","type":"conference","status":"public","author":[{"last_name":"Feldmann","id":"23538","full_name":"Feldmann, Michael","first_name":"Michael"},{"first_name":"Christina","full_name":"Kolb, Christina","id":"43647","last_name":"Kolb"},{"first_name":"Christian","last_name":"Scheideler","full_name":"Scheideler, Christian","id":"20792"},{"full_name":"Strothmann, Thim Frederik","id":"11319","last_name":"Strothmann","first_name":"Thim Frederik"}],"date_updated":"2022-01-06T06:51:05Z","conference":{"end_date":"2018-5-24","location":"Vancouver","name":"32nd IEEE International Parallel & Distributed Processing Symposium (IPDPS)","start_date":"2018-5-22"},"doi":"10.1109/IPDPS.2018.00114","has_accepted_license":"1","citation":{"bibtex":"@inproceedings{Feldmann_Kolb_Scheideler_Strothmann_2018, title={Self-Stabilizing Supervised Publish-Subscribe Systems}, DOI={<a href=\"https://doi.org/10.1109/IPDPS.2018.00114\">10.1109/IPDPS.2018.00114</a>}, booktitle={Proceedings of the 32nd IEEE International Parallel &#38; Distributed Processing Symposium (IPDPS)}, publisher={IEEE}, author={Feldmann, Michael and Kolb, Christina and Scheideler, Christian and Strothmann, Thim Frederik}, year={2018} }","mla":"Feldmann, Michael, et al. “Self-Stabilizing Supervised Publish-Subscribe Systems.” <i>Proceedings of the 32nd IEEE International Parallel &#38; Distributed Processing Symposium (IPDPS)</i>, IEEE, 2018, doi:<a href=\"https://doi.org/10.1109/IPDPS.2018.00114\">10.1109/IPDPS.2018.00114</a>.","short":"M. Feldmann, C. Kolb, C. Scheideler, T.F. Strothmann, in: Proceedings of the 32nd IEEE International Parallel &#38; Distributed Processing Symposium (IPDPS), IEEE, 2018.","apa":"Feldmann, M., Kolb, C., Scheideler, C., &#38; Strothmann, T. F. (2018). Self-Stabilizing Supervised Publish-Subscribe Systems. In <i>Proceedings of the 32nd IEEE International Parallel &#38; Distributed Processing Symposium (IPDPS)</i>. Vancouver: IEEE. <a href=\"https://doi.org/10.1109/IPDPS.2018.00114\">https://doi.org/10.1109/IPDPS.2018.00114</a>","chicago":"Feldmann, Michael, Christina Kolb, Christian Scheideler, and Thim Frederik Strothmann. “Self-Stabilizing Supervised Publish-Subscribe Systems.” In <i>Proceedings of the 32nd IEEE International Parallel &#38; Distributed Processing Symposium (IPDPS)</i>. IEEE, 2018. <a href=\"https://doi.org/10.1109/IPDPS.2018.00114\">https://doi.org/10.1109/IPDPS.2018.00114</a>.","ieee":"M. Feldmann, C. Kolb, C. Scheideler, and T. F. Strothmann, “Self-Stabilizing Supervised Publish-Subscribe Systems,” in <i>Proceedings of the 32nd IEEE International Parallel &#38; Distributed Processing Symposium (IPDPS)</i>, Vancouver, 2018.","ama":"Feldmann M, Kolb C, Scheideler C, Strothmann TF. Self-Stabilizing Supervised Publish-Subscribe Systems. In: <i>Proceedings of the 32nd IEEE International Parallel &#38; Distributed Processing Symposium (IPDPS)</i>. IEEE; 2018. doi:<a href=\"https://doi.org/10.1109/IPDPS.2018.00114\">10.1109/IPDPS.2018.00114</a>"}},{"publisher":"Springer, Cham","date_created":"2018-09-17T13:12:18Z","title":"A Self-Stabilizing Hashed Patricia Trie","year":"2018","external_id":{"arxiv":["1809.04923"]},"ddc":["000"],"keyword":["Self-Stabilizing","Prefix Search","Distributed Data Structure"],"language":[{"iso":"eng"}],"publication":"Proceedings of the 20th International Symposium on Stabilization, Safety, and Security of Distributed Systems (SSS)","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."}],"file":[{"success":1,"relation":"main_file","content_type":"application/pdf","file_size":500005,"file_name":"ASelf-stabilizingHashedPatrici.pdf","access_level":"closed","file_id":"5277","date_updated":"2018-11-02T14:38:37Z","creator":"ups","date_created":"2018-11-02T14:38:37Z"}],"date_updated":"2022-01-06T07:01:02Z","author":[{"orcid":"0000-0003-2014-4696","last_name":"Knollmann","full_name":"Knollmann, Till","id":"39241","first_name":"Till"},{"last_name":"Scheideler","id":"20792","full_name":"Scheideler, Christian","first_name":"Christian"}],"volume":11201,"doi":"10.1007/978-3-030-03232-6_1","conference":{"name":"20th International Symposium on Stabilization, Safety, and Security of Distributed Systems (SSS)","start_date":"2018-11-04","end_date":"2018-11-07","location":"Tokyo"},"has_accepted_license":"1","citation":{"ama":"Knollmann T, Scheideler C. A Self-Stabilizing Hashed Patricia Trie. In: Izumi T, Kuznetsov P, eds. <i>Proceedings of the 20th International Symposium on Stabilization, Safety, and Security of Distributed Systems (SSS)</i>. Vol 11201. Lecture Notes of Computer Science. Springer, Cham; 2018. doi:<a href=\"https://doi.org/10.1007/978-3-030-03232-6_1\">10.1007/978-3-030-03232-6_1</a>","ieee":"T. Knollmann and C. Scheideler, “A Self-Stabilizing Hashed Patricia Trie,” in <i>Proceedings of the 20th International Symposium on Stabilization, Safety, and Security of Distributed Systems (SSS)</i>, Tokyo, 2018, vol. 11201.","chicago":"Knollmann, Till, and Christian Scheideler. “A Self-Stabilizing Hashed Patricia Trie.” In <i>Proceedings of the 20th International Symposium on Stabilization, Safety, and Security of Distributed Systems (SSS)</i>, edited by Taisuke Izumi and Petr Kuznetsov, Vol. 11201. Lecture Notes of Computer Science. Springer, Cham, 2018. <a href=\"https://doi.org/10.1007/978-3-030-03232-6_1\">https://doi.org/10.1007/978-3-030-03232-6_1</a>.","bibtex":"@inproceedings{Knollmann_Scheideler_2018, series={Lecture Notes of Computer Science}, title={A Self-Stabilizing Hashed Patricia Trie}, volume={11201}, DOI={<a href=\"https://doi.org/10.1007/978-3-030-03232-6_1\">10.1007/978-3-030-03232-6_1</a>}, 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} }","mla":"Knollmann, Till, and Christian Scheideler. “A Self-Stabilizing Hashed Patricia Trie.” <i>Proceedings of the 20th International Symposium on Stabilization, Safety, and Security of Distributed Systems (SSS)</i>, edited by Taisuke Izumi and Petr Kuznetsov, vol. 11201, Springer, Cham, 2018, doi:<a href=\"https://doi.org/10.1007/978-3-030-03232-6_1\">10.1007/978-3-030-03232-6_1</a>.","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.","apa":"Knollmann, T., &#38; Scheideler, C. (2018). A Self-Stabilizing Hashed Patricia Trie. In T. Izumi &#38; P. Kuznetsov (Eds.), <i>Proceedings of the 20th International Symposium on Stabilization, Safety, and Security of Distributed Systems (SSS)</i> (Vol. 11201). Tokyo: Springer, Cham. <a href=\"https://doi.org/10.1007/978-3-030-03232-6_1\">https://doi.org/10.1007/978-3-030-03232-6_1</a>"},"intvolume":"     11201","project":[{"name":"SFB 901","_id":"1"},{"_id":"2","name":"SFB 901 - Project Area A"},{"name":"SFB 901 - Subproject A1","_id":"5"}],"_id":"4411","user_id":"39241","series_title":"Lecture Notes of Computer Science","department":[{"_id":"63"},{"_id":"79"}],"file_date_updated":"2018-11-02T14:38:37Z","type":"conference","editor":[{"last_name":"Izumi","full_name":"Izumi, Taisuke","first_name":"Taisuke"},{"first_name":"Petr","last_name":"Kuznetsov","full_name":"Kuznetsov, Petr"}],"status":"public"},{"department":[{"_id":"151"}],"user_id":"210","_id":"9999","project":[{"name":"Intelligente Herstellung zuverlässiger Kupferbondverbindungen","_id":"92","grant_number":"02 PQ2210"}],"language":[{"iso":"eng"}],"keyword":["wire bonding","multi-objective optimization","process model","copper wire","self-optimization"],"publication":"In Proceedings of IMAPS 2018 – 51st Symposium on Microelectronics, Pasadena, CA, 2018","type":"conference","status":"public","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."}],"volume":"Vol. 2018, No. 1, pp. 000572-000577.","date_created":"2019-05-27T10:27:45Z","author":[{"full_name":"Unger, Andreas","last_name":"Unger","first_name":"Andreas"},{"first_name":"Matthias","last_name":"Hunstig","full_name":"Hunstig, Matthias"},{"last_name":"Meyer","full_name":"Meyer, Tobias","first_name":"Tobias"},{"first_name":"Michael","full_name":"Brökelmann, Michael","last_name":"Brökelmann"},{"full_name":"Sextro, Walter","id":"21220","last_name":"Sextro","first_name":"Walter"}],"date_updated":"2020-05-07T05:33:56Z","doi":"10.4071/2380-4505-2018.1.000572","title":"Intelligent Production of Wire Bonds using Multi-Objective Optimization – Insights, Opportunities and Challenges","quality_controlled":"1","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: <i>In Proceedings of IMAPS 2018 – 51st Symposium on Microelectronics, Pasadena, CA, 2018</i>. Vol Vol. 2018, No. 1, pp. 000572-000577. ; 2018. doi:<a href=\"https://doi.org/10.4071/2380-4505-2018.1.000572\">10.4071/2380-4505-2018.1.000572</a>","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 <i>In Proceedings of IMAPS 2018 – 51st Symposium on Microelectronics, Pasadena, CA, 2018</i>, 2018, vol. Vol. 2018, No. 1, pp. 000572-000577.","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 <i>In Proceedings of IMAPS 2018 – 51st Symposium on Microelectronics, Pasadena, CA, 2018</i>, Vol. Vol. 2018, No. 1, pp. 000572-000577., 2018. <a href=\"https://doi.org/10.4071/2380-4505-2018.1.000572\">https://doi.org/10.4071/2380-4505-2018.1.000572</a>.","apa":"Unger, A., Hunstig, M., Meyer, T., Brökelmann, M., &#38; Sextro, W. (2018). Intelligent Production of Wire Bonds using Multi-Objective Optimization – Insights, Opportunities and Challenges. In <i>In Proceedings of IMAPS 2018 – 51st Symposium on Microelectronics, Pasadena, CA, 2018</i> (Vol. Vol. 2018, No. 1, pp. 000572-000577.). <a href=\"https://doi.org/10.4071/2380-4505-2018.1.000572\">https://doi.org/10.4071/2380-4505-2018.1.000572</a>","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.","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={<a href=\"https://doi.org/10.4071/2380-4505-2018.1.000572\">10.4071/2380-4505-2018.1.000572</a>}, 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} }","mla":"Unger, Andreas, et al. “Intelligent Production of Wire Bonds Using Multi-Objective Optimization – Insights, Opportunities and Challenges.” <i>In Proceedings of IMAPS 2018 – 51st Symposium on Microelectronics, Pasadena, CA, 2018</i>, vol. Vol. 2018, No. 1, pp. 000572-000577., 2018, doi:<a href=\"https://doi.org/10.4071/2380-4505-2018.1.000572\">10.4071/2380-4505-2018.1.000572</a>."},"year":"2018"},{"status":"public","type":"journal_article","_id":"32158","department":[{"_id":"424"}],"user_id":"42165","page":"7-17","intvolume":"        49","citation":{"chicago":"Bertau, Marie-Cécile, and Andrea Karsten. “Reconsidering Interiorization: Self Moving across Language Spacetimes.” <i>New Ideas in Psychology</i> 49 (2018): 7–17. <a href=\"https://doi.org/10.1016/j.newideapsych.2017.12.001\">https://doi.org/10.1016/j.newideapsych.2017.12.001</a>.","ieee":"M.-C. Bertau and A. Karsten, “Reconsidering interiorization: Self moving across language spacetimes,” <i>New Ideas in Psychology</i>, vol. 49, pp. 7–17, 2018, doi: <a href=\"https://doi.org/10.1016/j.newideapsych.2017.12.001\">10.1016/j.newideapsych.2017.12.001</a>.","ama":"Bertau M-C, Karsten A. Reconsidering interiorization: Self moving across language spacetimes. <i>New Ideas in Psychology</i>. 2018;49:7-17. doi:<a href=\"https://doi.org/10.1016/j.newideapsych.2017.12.001\">10.1016/j.newideapsych.2017.12.001</a>","apa":"Bertau, M.-C., &#38; Karsten, A. (2018). Reconsidering interiorization: Self moving across language spacetimes. <i>New Ideas in Psychology</i>, <i>49</i>, 7–17. <a href=\"https://doi.org/10.1016/j.newideapsych.2017.12.001\">https://doi.org/10.1016/j.newideapsych.2017.12.001</a>","mla":"Bertau, Marie-Cécile, and Andrea Karsten. “Reconsidering Interiorization: Self Moving across Language Spacetimes.” <i>New Ideas in Psychology</i>, vol. 49, Elsevier BV, 2018, pp. 7–17, doi:<a href=\"https://doi.org/10.1016/j.newideapsych.2017.12.001\">10.1016/j.newideapsych.2017.12.001</a>.","short":"M.-C. Bertau, A. Karsten, New Ideas in Psychology 49 (2018) 7–17.","bibtex":"@article{Bertau_Karsten_2018, title={Reconsidering interiorization: Self moving across language spacetimes}, volume={49}, DOI={<a href=\"https://doi.org/10.1016/j.newideapsych.2017.12.001\">10.1016/j.newideapsych.2017.12.001</a>}, journal={New Ideas in Psychology}, publisher={Elsevier BV}, author={Bertau, Marie-Cécile and Karsten, Andrea}, year={2018}, pages={7–17} }"},"publication_identifier":{"issn":["0732-118X"]},"publication_status":"published","doi":"10.1016/j.newideapsych.2017.12.001","date_updated":"2022-07-18T09:21:16Z","volume":49,"author":[{"full_name":"Bertau, Marie-Cécile","last_name":"Bertau","first_name":"Marie-Cécile"},{"id":"53917","full_name":"Karsten, Andrea","last_name":"Karsten","first_name":"Andrea"}],"abstract":[{"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).","lang":"eng"}],"publication":"New Ideas in Psychology","keyword":["Interiorization","Dialogical self","Language activity","Voice","Vygotsky","Heterotopia","Video-confrontation"],"language":[{"iso":"eng"}],"year":"2018","title":"Reconsidering interiorization: Self moving across language spacetimes","publisher":"Elsevier BV","date_created":"2022-06-24T14:41:20Z"},{"volume":8,"date_created":"2018-09-18T08:47:00Z","author":[{"last_name":"Fust","full_name":"Fust, Alexander Paul","first_name":"Alexander Paul"},{"first_name":"Tobias","orcid":" https://orcid.org/0000-0001-9262-5646","last_name":"Jenert","id":"71994","full_name":"Jenert, Tobias"},{"full_name":"Winkler, Christoph","last_name":"Winkler","first_name":"Christoph"}],"date_updated":"2024-03-21T14:43:08Z","publisher":"de @Gruyter","title":"Experiential or Self-Regulated Learning: A Critical Reflection of Entrepreneurial Learning Processes","issue":"2","publication_identifier":{"unknown":["2194-6175"]},"quality_controlled":"1","page":"1-11","intvolume":"         8","citation":{"apa":"Fust, A. P., Jenert, T., &#38; Winkler, C. (2018). Experiential or Self-Regulated Learning: A Critical Reflection of Entrepreneurial Learning Processes. <i>Entrepreneurship Research Journal</i>, <i>8</i>(2), 1–11.","mla":"Fust, Alexander Paul, et al. “Experiential or Self-Regulated Learning: A Critical Reflection of Entrepreneurial Learning Processes.” <i>Entrepreneurship Research Journal</i>, vol. 8, no. 2, de @Gruyter, 2018, pp. 1–11.","short":"A.P. Fust, T. Jenert, C. Winkler, Entrepreneurship Research Journal 8 (2018) 1–11.","bibtex":"@article{Fust_Jenert_Winkler_2018, title={Experiential or Self-Regulated Learning: A Critical Reflection of Entrepreneurial Learning Processes}, volume={8}, number={2}, journal={Entrepreneurship Research Journal}, publisher={de @Gruyter}, author={Fust, Alexander Paul and Jenert, Tobias and Winkler, Christoph}, year={2018}, pages={1–11} }","ieee":"A. P. Fust, T. Jenert, and C. Winkler, “Experiential or Self-Regulated Learning: A Critical Reflection of Entrepreneurial Learning Processes,” <i>Entrepreneurship Research Journal</i>, vol. 8, no. 2, pp. 1–11, 2018.","chicago":"Fust, Alexander Paul, Tobias Jenert, and Christoph Winkler. “Experiential or Self-Regulated Learning: A Critical Reflection of Entrepreneurial Learning Processes.” <i>Entrepreneurship Research Journal</i> 8, no. 2 (2018): 1–11.","ama":"Fust AP, Jenert T, Winkler C. Experiential or Self-Regulated Learning: A Critical Reflection of Entrepreneurial Learning Processes. <i>Entrepreneurship Research Journal</i>. 2018;8(2):1-11."},"year":"2018","department":[{"_id":"208"},{"_id":"282"}],"user_id":"71994","_id":"4419","language":[{"iso":"eng"}],"keyword":["entrepreneurial learning","experiential learning","self-regulated learning"],"publication":"Entrepreneurship Research Journal","type":"journal_article","status":"public","abstract":[{"lang":"eng","text":"Research on entrepreneurial learning highlights the importance of experience and prior knowledge to entrepreneurial success. However, a conundrum remains and we are still seeking answers as to why some novice entrepreneurs learn successfully from their experiences and succeed, while some experienced entrepreneurs fail with their ventures. In order to advance the discussion about the role of experience during entrepreneurial learning, our critical reflection aims to (1) highlight some of the shortcomings of experiential learning theory (ELT) and (2) illustrate how alternative theoretical perspectives have the potential to advance our conceptual understanding of entrepreneurial learning processes. We argue for an explanation of entrepreneurial learning as a dynamic and self-regulated process that relies on planning, monitoring, and self-reflection."}]},{"author":[{"first_name":"Tobias","full_name":"Meyer, Tobias","last_name":"Meyer"}],"date_created":"2019-05-27T10:21:17Z","date_updated":"2023-09-15T12:26:09Z","publisher":"Shaker","title":"Optimization-based reliability control of mechatronic systems","citation":{"bibtex":"@book{Meyer_2018, title={Optimization-based reliability control of mechatronic systems}, publisher={Shaker}, author={Meyer, Tobias}, year={2018} }","short":"T. Meyer, Optimization-Based Reliability Control of Mechatronic Systems, Shaker, 2018.","mla":"Meyer, Tobias. <i>Optimization-Based Reliability Control of Mechatronic Systems</i>. Shaker, 2018.","apa":"Meyer, T. (2018). <i>Optimization-based reliability control of mechatronic systems</i>. Shaker.","ama":"Meyer T. <i>Optimization-Based Reliability Control of Mechatronic Systems</i>. Shaker; 2018.","chicago":"Meyer, Tobias. <i>Optimization-Based Reliability Control of Mechatronic Systems</i>. Shaker, 2018.","ieee":"T. Meyer, <i>Optimization-based reliability control of mechatronic systems</i>. Shaker, 2018."},"year":"2018","department":[{"_id":"151"}],"user_id":"210","_id":"9994","language":[{"iso":"eng"}],"keyword":["dependability","reliability","behavior adaptation","self-optimization","multiobjective optimization","optimal control","automotive drivetrain","clutch system","reliability-adaptive system"],"type":"dissertation","status":"public","abstract":[{"lang":"eng","text":"Reliability-adaptive systems allow an adaptation of system behavior based on current system reliability. They can extend their lifetime at the cost of lowered performance or vice versa. This can be used to adapt failure behavior according to a maintenance plan, thus increasing availability while using up system capability fully. To facilitate setup, a control algorithm independent of a degradation model is desired. A closed loop control technique for reliability based on a health index, a measure for system degradation, is introduced. It uses self-optimization as means to implement behavior adaptation. This is based on selecting the priorities of objectives that the system pursues. Possible working points are computed beforehand using model-based multiobjective optimization techniques. The controller selects the priorities of objectives and this way balances reliability and performance. As exemplary application, an automatically actuated single plate dry clutch is introduced. The entire reliability control is setup and lifetime experiments are conducted. Results show that the variance of time to failure is reduced greatly, making the failure behavior more predictable. At the same time, the desired usable lifetime can be extended at the cost of system performance to allow for changed maintenance intervals. Together, these possibilities allow for greater system usage and better planning of maintenance."}]},{"doi":"10.1016/j.matdes.2018.10.032","title":"Preceramic core-shell particles for the preparation of hybrid colloidal crystal films by melt-shear organization and conversion into porous ceramics","volume":160,"author":[{"first_name":"Steffen","full_name":"Vowinkel, Steffen","last_name":"Vowinkel"},{"full_name":"Boehm, Anna","last_name":"Boehm","first_name":"Anna"},{"first_name":"Timmy","last_name":"Schäfer","full_name":"Schäfer, Timmy"},{"last_name":"Gutmann","full_name":"Gutmann, Torsten","id":"118165","first_name":"Torsten"},{"first_name":"Emanuel","full_name":"Ionescu, Emanuel","last_name":"Ionescu"},{"first_name":"Markus","last_name":"Gallei","full_name":"Gallei, Markus"}],"date_created":"2026-02-07T16:15:42Z","date_updated":"2026-02-17T16:12:52Z","intvolume":"       160","page":"926–935","citation":{"ama":"Vowinkel S, Boehm A, Schäfer T, Gutmann T, Ionescu E, Gallei M. Preceramic core-shell particles for the preparation of hybrid colloidal crystal films by melt-shear organization and conversion into porous ceramics. <i>Materials &#38; Design</i>. 2018;160:926–935. doi:<a href=\"https://doi.org/10.1016/j.matdes.2018.10.032\">10.1016/j.matdes.2018.10.032</a>","chicago":"Vowinkel, Steffen, Anna Boehm, Timmy Schäfer, Torsten Gutmann, Emanuel Ionescu, and Markus Gallei. “Preceramic Core-Shell Particles for the Preparation of Hybrid Colloidal Crystal Films by Melt-Shear Organization and Conversion into Porous Ceramics.” <i>Materials &#38; Design</i> 160 (2018): 926–935. <a href=\"https://doi.org/10.1016/j.matdes.2018.10.032\">https://doi.org/10.1016/j.matdes.2018.10.032</a>.","ieee":"S. Vowinkel, A. Boehm, T. Schäfer, T. Gutmann, E. Ionescu, and M. Gallei, “Preceramic core-shell particles for the preparation of hybrid colloidal crystal films by melt-shear organization and conversion into porous ceramics,” <i>Materials &#38; Design</i>, vol. 160, pp. 926–935, 2018, doi: <a href=\"https://doi.org/10.1016/j.matdes.2018.10.032\">10.1016/j.matdes.2018.10.032</a>.","apa":"Vowinkel, S., Boehm, A., Schäfer, T., Gutmann, T., Ionescu, E., &#38; Gallei, M. (2018). Preceramic core-shell particles for the preparation of hybrid colloidal crystal films by melt-shear organization and conversion into porous ceramics. <i>Materials &#38; Design</i>, <i>160</i>, 926–935. <a href=\"https://doi.org/10.1016/j.matdes.2018.10.032\">https://doi.org/10.1016/j.matdes.2018.10.032</a>","short":"S. Vowinkel, A. Boehm, T. Schäfer, T. Gutmann, E. Ionescu, M. Gallei, Materials &#38; Design 160 (2018) 926–935.","mla":"Vowinkel, Steffen, et al. “Preceramic Core-Shell Particles for the Preparation of Hybrid Colloidal Crystal Films by Melt-Shear Organization and Conversion into Porous Ceramics.” <i>Materials &#38; Design</i>, vol. 160, 2018, pp. 926–935, doi:<a href=\"https://doi.org/10.1016/j.matdes.2018.10.032\">10.1016/j.matdes.2018.10.032</a>.","bibtex":"@article{Vowinkel_Boehm_Schäfer_Gutmann_Ionescu_Gallei_2018, title={Preceramic core-shell particles for the preparation of hybrid colloidal crystal films by melt-shear organization and conversion into porous ceramics}, volume={160}, DOI={<a href=\"https://doi.org/10.1016/j.matdes.2018.10.032\">10.1016/j.matdes.2018.10.032</a>}, journal={Materials &#38; Design}, author={Vowinkel, Steffen and Boehm, Anna and Schäfer, Timmy and Gutmann, Torsten and Ionescu, Emanuel and Gallei, Markus}, year={2018}, pages={926–935} }"},"year":"2018","extern":"1","language":[{"iso":"eng"}],"keyword":["emulsion polymerization","self-assembly","ATRP","Colloidal crystal","Hybrid film","Particle processing"],"user_id":"100715","_id":"64054","status":"public","abstract":[{"text":"In this work, the preparation of porous hybrid particle-based films by core-shell particle design and convenient film preparation is reported. Monodisperse core particles consisting of poly(methyl methacrylate‑co‑allyl methacrylate) (P(MMA‑co‑ALMA)) were synthesized by starved-feed emulsion polymerization followed by the introduction of an initiator-containing monomer (inimer) for subsequent atom transfer radical polymerization (ATRP). The inimer shell allowed for the introduction of allylhydrido polycarbosilane (SMP-10) under ATRP conditions by grafting to the core particles. The functionalization of the prepared core-shell particles was investigated by IR spectroscopy (FTIR), scanning transmission electron microscopy (STEM) and solid-state NMR combined with dynamic nuclear polarization (DNP). The obtained hard core/soft preceramic shell particles were subjected to the melt-shear organization technique, enabling a convenient alignment into a colloidal crystal structure in one single step without the presence of a dispersion medium or solvent for the designed particles. Moreover, the hybrid particle-based films were converted into a porous ceramic structure upon thermal treatment. As a result, freestanding ceramic porous films have been obtained after degradation of the organic template core particles. Noteworthy, the conversion of the matrix material consisting of SMP-10 into the ceramic occurred with preservation of the pristine colloidal crystal template structure. Herein, the first example of core-shell particle preparation by combining different polymerization methodologies and application of the convenient melt-shear organization technique is shown, paving a new way to ceramic materials with tailored morphology and porosity.","lang":"eng"}],"publication":"Materials & Design","type":"journal_article"}]