@article{61933, abstract = {{Laterally coupled vertical-cavity surface-emitting lasers (VCSELs) can exhibit additional resonances at high modulation frequencies that can substantially increase the laser’s modulation bandwidth. State-of-the-art laterally coupled devices require non-standard manufacturing technology and precise tuning of the currents supplied to each cavity separately to form optical supermodes suitable for such resonances. Here, we report on a novel switching phenomenon in laterally coupled VCSEL structures having only a single common electric contact and manufactured in a standard oxide-confined VCSEL geometry. At lower currents, they can be operated in a weakly coupled (WCR) regime and, at higher currents, in an injection-locked (IL) regime, enabling fundamentally different spectral and dynamic features. In the WCR, both optical supermodes lase and a narrow tunable plasma-assisted peak at their beating frequency is observed for each of the apertures, with a current-dependent frequency tuning and anti-phase intensity oscillations in each of the cavities. In contrast, in the IL regimes, only one (anti-symmetric) supermode lases. This adds a broader resonance to the modulation response while the intensity oscillations in both cavities are in-phase. Only the IL regime can result in increased modulation bandwidth of the system. Measurements of the pulse responses and continuous modulation up to 70 GHz for both operational regimes are presented and compared with simulations of our distributed rate equation model whose parameters are extracted from full-wave electromagnetic simulations of the device, including the temperature distribution in the device. Excellent agreement is found and enables comprehensive understanding of the dynamics of supermodes in oxide-confined coupled cavity VCSELs.}}, author = {{Lindemann, M. and D’Alessandro, M. and Ledentsov, N. and Makarov, O. Y. and Ledentsov, N. N. and Tibaldi, A. and Gerhardt, N. C. and Hofmann, M. R.}}, issn = {{0021-8979}}, journal = {{Journal of Applied Physics}}, number = {{5}}, publisher = {{AIP Publishing}}, title = {{{Laterally coupled vertical-cavity surface-emitting lasers with tunable resonance width and frequency}}}, doi = {{10.1063/5.0275622}}, volume = {{138}}, year = {{2025}}, } @article{61934, abstract = {{Laterally coupled vertical-cavity surface-emitting lasers (VCSELs) can exhibit additional resonances at high modulation frequencies that can substantially increase the laser’s modulation bandwidth. State-of-the-art laterally coupled devices require non-standard manufacturing technology and precise tuning of the currents supplied to each cavity separately to form optical supermodes suitable for such resonances. Here, we report on a novel switching phenomenon in laterally coupled VCSEL structures having only a single common electric contact and manufactured in a standard oxide-confined VCSEL geometry. At lower currents, they can be operated in a weakly coupled (WCR) regime and, at higher currents, in an injection-locked (IL) regime, enabling fundamentally different spectral and dynamic features. In the WCR, both optical supermodes lase and a narrow tunable plasma-assisted peak at their beating frequency is observed for each of the apertures, with a current-dependent frequency tuning and anti-phase intensity oscillations in each of the cavities. In contrast, in the IL regimes, only one (anti-symmetric) supermode lases. This adds a broader resonance to the modulation response while the intensity oscillations in both cavities are in-phase. Only the IL regime can result in increased modulation bandwidth of the system. Measurements of the pulse responses and continuous modulation up to 70 GHz for both operational regimes are presented and compared with simulations of our distributed rate equation model whose parameters are extracted from full-wave electromagnetic simulations of the device, including the temperature distribution in the device. Excellent agreement is found and enables comprehensive understanding of the dynamics of supermodes in oxide-confined coupled cavity VCSELs.}}, author = {{Lindemann, M. and D’Alessandro, M. and Ledentsov, N. and Makarov, O. Y. and Ledentsov, N. N. and Tibaldi, A. and Gerhardt, N. C. and Hofmann, M. R.}}, issn = {{0021-8979}}, journal = {{Journal of Applied Physics}}, number = {{5}}, publisher = {{AIP Publishing}}, title = {{{Laterally coupled vertical-cavity surface-emitting lasers with tunable resonance width and frequency}}}, doi = {{10.1063/5.0275622}}, volume = {{138}}, year = {{2025}}, } @inproceedings{61936, author = {{Karakaya, Kadiray and Muthuraman, Palaniappan and Bodden, Eric}}, booktitle = {{Proceedings of the 14th ACM SIGPLAN International Workshop on the State Of the Art in Program Analysis}}, publisher = {{ACM}}, title = {{{Pick Your Call Graphs Well: On Scaling IFDS-Based Data-Flow Analyses}}}, doi = {{10.1145/3735544.3735587}}, year = {{2025}}, } @inproceedings{60503, abstract = {{Censors have long censored Transport Layer Security (TLS) traffic by inspecting the domain name in the unencrypted Server Name Indication (SNI) extension. By encrypting the SNI extension, the Encrypted ClientHello (ECH) prevents censors from blocking TLS traffic to certain domains. Despite this promising outlook, ECH’s current capability to contest TLS censorship is unclear; for instance, Russia has started censoring ECH connections successfully. This paper clarifies ECH’s current role for TLS censorship. To this end, we evaluate servers’ support for ECH and its analysis and subsequent blocking by censors. We determine Cloudflare as the only major provider supporting ECH. Additionally, we affirm previously known ECH censorship in Russia and uncover indirect censorship of ECH through encrypted DNS censorship in China and Iran. Our findings suggest that ECH’s contribution to censorship circumvention is currently limited: we consider ECH’s dependence on encrypted DNS especially challenging for ECH’s capability to circumvent censorship. We stress the importance of censorship-resistant ECH to solve the long-known problem of SNI-based TLS censorship.}}, author = {{Niere, Niklas and Lange, Felix and Heitmann, Nico and Somorovsky, Juraj}}, keywords = {{censorship, circumvention, ECH, TLS}}, location = {{Washington, D.C.}}, title = {{{Encrypted Client Hello (ECH) in Censorship Circumvention}}}, year = {{2025}}, } @inbook{61946, author = {{Karaca, Resul}}, booktitle = {{L'islam dans la culture populaire: reconfigurations et nouvelles visibilités}}, editor = {{Karaca, Resul}}, isbn = {{978-2-336-56512-5}}, pages = {{119--144}}, publisher = {{L'Harmattan}}, title = {{{L'évolution de la visibilité des musulmans de France dans l'espace public et numérique }}}, year = {{2025}}, } @inproceedings{61951, abstract = {{ABSTRACT:Digital transformation has reshaped the manufacturing sector, driving innovation and new business models. Simultaneously, sustainability pressures and stricter regulations push companies to adopt circular economy (CE) principles, focusing on reducing, reusing, and recycling materials. This transition requires adapting business models, product design, and management while integrating processes such as reverse logistics. Digital technologies play a crucial role by enabling data generation, processing, and analysis, optimizing production, and reducing resource use. However, many companies face knowledge gaps regarding how to implement these technologies effectively for CE. This study addresses these challenges through a systematic literature review, offering a framework that links digital technologies to CE principles, focusing on slowing, narrowing, and closing material loops.}}, author = {{Scholtysik, Michel and Rasor, Anja and Petzke, Lisa Irene and Koldewey, Christian and Dumitrescu, Roman}}, booktitle = {{Proceedings of the Design Society}}, issn = {{2732-527X}}, pages = {{541--550}}, publisher = {{Cambridge University Press (CUP)}}, title = {{{An integrative perspective on digital technologies and circular economy: a systematic literature review}}}, doi = {{10.1017/pds.2025.10068}}, volume = {{5}}, year = {{2025}}, } @inproceedings{61948, abstract = {{ABSTRACT:Sustainability is no longer just a trend for companies, but is now seen as a mandatory measure for the environmentally friendly and responsible use of existing resources. The Digital Product Passport (DPP) is a transformative tool that aims to increase transparency and promote sustainability throughout the product lifecycle. This paper presents the 150% Information List, a comprehensive framework to help companies identify mandatory and optional data for the DPP. Using a systematic literature review, grey literature analysis and interviews with industry stakeholders, the study compiles 148 data points grouped by product relevance, availability and life cycle phase. The findings highlight the flexibility of the list to adapt to different industries and underline its potential to optimise resource use, meet regulatory requirements and drive innovation in product development.}}, author = {{Trienens, Malte and Orlowski, Valentin and Schröder, Luca and Hovemann, Aschot and Dumitrescu, Roman}}, booktitle = {{Proceedings of the Design Society}}, issn = {{2732-527X}}, pages = {{2093--2100}}, publisher = {{Cambridge University Press (CUP)}}, title = {{{Information management for the digital product passport: a 150% approach}}}, doi = {{10.1017/pds.2025.10223}}, volume = {{5}}, year = {{2025}}, } @inproceedings{61949, abstract = {{ABSTRACT:Facing increasingly dynamic market environments and global challenges such as climate change and resource scarcity, companies are under constant pressure to innovate and remain competitive. As technology is a key enabler, companies need to understand the drivers of technological change. Technology Foresight systematically identifies and analyzes emerging technologies to support engineering design decisions. However, the growing volume of data is outpacing manual processing capabilities. This research explores the integration of Generative AI to enhance Technology Foresight by automating technology analysis and information synthesis. This paper presents a comprehensive problem analysis, reviews existing solutions, and proposes a framework that demonstrates the potential of Large Language Models combined with a Retrieval Augmented Generation architecture to transform Technology Foresight.}}, author = {{Ellermann, Kai and Seidenberg, Tobias and Asmar, Laban and Knepler, Jonas and Dumitrescu, Roman}}, booktitle = {{Proceedings of the Design Society}}, issn = {{2732-527X}}, pages = {{2221--2230}}, publisher = {{Cambridge University Press (CUP)}}, title = {{{Leveraging GenAI for technology foresight}}}, doi = {{10.1017/pds.2025.10236}}, volume = {{5}}, year = {{2025}}, } @inproceedings{61952, author = {{Wani, Bhavesh and Yee, Jingye and Eckertz, Daniel and Seidenberg, Tobias and Dumitrescu, Roman}}, booktitle = {{Seventeenth International Conference on Digital Image Processing (ICDIP 2025)}}, editor = {{Jiang, Xudong and Tian, Jindong and Poon, Ting-Chung and Wang, Zhaohui}}, publisher = {{SPIE}}, title = {{{Real-time object detection and localization for airport aprons}}}, doi = {{10.1117/12.3072877}}, year = {{2025}}, } @inproceedings{61955, author = {{Koldewey, Christian and Rohde, Malte Nick and Strobel, Gero and Vehmeyer, Julia Marie and Fichtler, Timm and Dumitrescu, Roman}}, booktitle = {{2025 IEEE International Conference on Engineering, Technology, and Innovation (ICE/ITMC)}}, publisher = {{IEEE}}, title = {{{Embedding Generative AI into Products – 10 Design Principles for Building Intelligent Systems}}}, doi = {{10.1109/ice/itmc65658.2025.11106522}}, year = {{2025}}, } @inproceedings{61956, author = {{Grote, Eva-Maria and Koldewey, Christian and Schwarz, Stefan Eric and Dumitrescu, Roman and Albers, Albert}}, booktitle = {{2025 IEEE International Conference on Engineering, Technology, and Innovation (ICE/ITMC)}}, publisher = {{IEEE}}, title = {{{Enabling Better Systems Through Better Teams: 27 Role Profiles for Engineering Advanced Systems}}}, doi = {{10.1109/ice/itmc65658.2025.11106533}}, year = {{2025}}, } @inproceedings{61954, author = {{Fichtler, Timm and Petzke, Lisa Irene and Grigoryan, Khoren and Dumitrescu, Roman and Koldewey, Christian}}, booktitle = {{2025 IEEE International Conference on Engineering, Technology, and Innovation (ICE/ITMC)}}, publisher = {{IEEE}}, title = {{{Digital Transformation of Organizational Entities}}}, doi = {{10.1109/ice/itmc65658.2025.11106627}}, year = {{2025}}, } @article{61957, author = {{Rasor, Anja and Koldewey, Christian and Dumitrescu, Roman}}, journal = {{Nachhaltige Industrie}}, number = {{2}}, pages = {{40--43}}, publisher = {{Springer Fachmedien Wiesbaden}}, title = {{{Mit digitalen Hebeln zur Kreislaufwirtschaft: Mit digitalen Hebeln zur Kreislaufwirtschaft}}}, volume = {{6}}, year = {{2025}}, } @article{61989, abstract = {{Abstract Große Sprachmodelle wie GPT-4 bieten erhebliche Potenziale für das Systems Engineering. Prompt-Engineering ermöglicht einen flexiblen Einsatz im Anforderungsmanagement, Systementwurf und in der Integration, Verifikation und Validierung ohne aufwendiges Modelltraining. Die Formulierung von Prompts und die Anwendung fortschrittlicher Techniken erfordern jedoch tiefes Domänenwissen. Der Beitrag zeigt Potenziale und Herausforderungen dieser Technik auf und illustriert praktische Anwendungsbeispiele}}, author = {{Hovemann, Aschot and Bita, Isaac Mpidi and Aldade, Abed Alrahman and von Heißen, Oliver and Dumitrescu, Roman}}, issn = {{2511-0896}}, journal = {{Zeitschrift für wirtschaftlichen Fabrikbetrieb}}, number = {{s1}}, pages = {{101--106}}, publisher = {{Walter de Gruyter GmbH}}, title = {{{Prompt Engineering im Systems Engineering}}}, doi = {{10.1515/zwf-2024-0139}}, volume = {{120}}, year = {{2025}}, } @inproceedings{61988, author = {{Weller, Julian and Lick, Jonas and Brock, Jonathan and Heuwinkel, Tim and Hartmann, Stefan and Kühn, Arno and von Enzberg, Sebastian and Dumitrescu, Roman}}, booktitle = {{Procedia CIRP}}, issn = {{2212-8271}}, pages = {{223--228}}, publisher = {{Elsevier BV}}, title = {{{Advanced Analytics Capability Map for Smart Factories: Supporting the Planning, Design, Management and Operations of Advanced Analytics Use Cases}}}, doi = {{10.1016/j.procir.2025.03.025}}, volume = {{134}}, year = {{2025}}, } @inproceedings{61986, author = {{Rasor, Anja and Vehmeyer, Julia and Kirchberg, Lisa and Scholtysik, Michel and Koldewey, Christian and Dumitrescu, Roman}}, booktitle = {{Procedia CIRP}}, issn = {{2212-8271}}, pages = {{972--977}}, publisher = {{Elsevier BV}}, title = {{{Key performance indicator system for evaluating the circular economy along the value chain}}}, doi = {{10.1016/j.procir.2025.01.084}}, volume = {{135}}, year = {{2025}}, } @inproceedings{61973, author = {{Grigoryan, Khoren and Martin, Lucas and Lamarz, Jessica and Fichtler, Timm and Hohn, Bennett and Asmar, Laban and Kühn, Arno and Dumitrescu, Roman}}, booktitle = {{Procedia CIRP}}, issn = {{2212-8271}}, pages = {{838--843}}, publisher = {{Elsevier BV}}, title = {{{Product Management: Tasks, Roles, and the Importance of Data}}}, doi = {{10.1016/j.procir.2025.08.143}}, volume = {{136}}, year = {{2025}}, } @inproceedings{61985, author = {{Petzke, Lisa Irene and Rasor, Anja and Koldewey, Christian and Dumitrescu, Roman}}, booktitle = {{Procedia CIRP}}, issn = {{2212-8271}}, pages = {{912--917}}, publisher = {{Elsevier BV}}, title = {{{Untangling circular value networks - mechanisms, advantages, risks, and future research}}}, doi = {{10.1016/j.procir.2025.01.081}}, volume = {{135}}, year = {{2025}}, } @inproceedings{61987, author = {{Könemann, Ulf and Niemeyer, Marcel and Schierbaum, Anja and Dumitrescu, Roman}}, booktitle = {{Procedia CIRP}}, issn = {{2212-8271}}, pages = {{765--770}}, publisher = {{Elsevier BV}}, title = {{{A serious game to introduce Systems Engineering in interdisciplinary teams}}}, doi = {{10.1016/j.procir.2025.02.195}}, volume = {{134}}, year = {{2025}}, } @inproceedings{61969, abstract = {{Assessing and communicating software security has become a crucial concern in the era of digital transformation. As software systems grow more complex and interconnected, it becomes increasingly challenging to effectively evaluate and communicate a product's security status to both technical and non-technical stakeholders. The Software Product Health Assistant (SPHA) is designed to automatically collect and aggregate data from existing expert tools and derive, among other scores, a transparent Security Score. SPHA is designed to present and explain this Security Score to decision-makers to support their responsibilities. In this paper, we demonstrate how to integrate data from SMARAGD (System Modeler for Architectural Risk Assessment and Guidance on Defenses), a safety-informed threat modeling tool, into SPHA to enhance the existing definition of its Security Score. To achieve this, we combine information about known vulnerabilities with architectural and threat data to calculate a realistic risk score for the product in question.}}, author = {{Strüwer, Jan-Niclas and Trentinaglia, Roman and Wohlers, Benedict and Bodden, Eric and Dumitrescu, Roman}}, booktitle = {{AHFE International}}, issn = {{2771-0718}}, publisher = {{AHFE International}}, title = {{{Assessing and Communicating Software Security: Enhancing Software Product Health with Architectural Threat Analysis}}}, doi = {{10.54941/ahfe1006145}}, volume = {{168}}, year = {{2025}}, }