@inproceedings{64219, author = {{Graunke, Jannis and Bita, Isaac Mpidi and Hermelingmeier, Dominik and Humpert, Lynn and Schierbaum, Anja and Dumitrescu, Roman}}, booktitle = {{2025 IEEE International Conference on Recent Advances in Systems Science and Engineering (RASSE)}}, publisher = {{IEEE}}, title = {{{Evolving Modularity: Rethinking Architecture in Product and Organizational Systems}}}, doi = {{10.1109/rasse64831.2025.11315315}}, year = {{2025}}, } @inproceedings{64205, author = {{Xu, Ying and Terhörst, Philipp and Pedersen, Marius and Raja, Kiran}}, booktitle = {{2025 IEEE 19th International Conference on Automatic Face and Gesture Recognition (FG)}}, publisher = {{IEEE}}, title = {{{Chasing Shadows: Solving Deepfake Detection Benchmarks Using Irrelevant Features Only}}}, doi = {{10.1109/fg61629.2025.11099163}}, year = {{2025}}, } @article{64206, author = {{Groß, Sebastian and Heindorf, Stefan and Terhörst, Philipp}}, journal = {{CoRR}}, title = {{{A Responsible Face Recognition Approach for Small and Mid-Scale Systems Through Personalized Neural Networks}}}, doi = {{10.48550/ARXIV.2505.19920}}, volume = {{abs/2505.19920}}, year = {{2025}}, } @article{64210, author = {{Al-Refai, Rouqaiah and Ramasamy, Pankaja Priya and Ramesh, Ragini and Arias-Cabarcos, Patricia and Terhörst, Philipp}}, journal = {{arXiv preprint arXiv:2508.13874}}, title = {{{A Comprehensive Re-Evaluation of Biometric Modality Properties in the Modern Era}}}, year = {{2025}}, } @inproceedings{64220, author = {{Disselkamp, Jan-Philipp and Seidenberg, Tobias and Lick, Jonas and Dumitrescu, Roman}}, booktitle = {{2025 IEEE International Conference on Recent Advances in Systems Science and Engineering (RASSE)}}, publisher = {{IEEE}}, title = {{{24 Reasons for the Failure of Integrative and Integrated Product and Production System Development Methods}}}, doi = {{10.1109/rasse64831.2025.11315397}}, year = {{2025}}, } @article{64222, author = {{Ködding, Patrick and Koldewey, Christian and Dumitrescu, Roman}}, issn = {{0360-8581}}, journal = {{IEEE Engineering Management Review}}, pages = {{1--9}}, publisher = {{Institute of Electrical and Electronics Engineers (IEEE)}}, title = {{{Tailoring scenario projects with method and tool building blocks}}}, doi = {{10.1109/emr.2025.3646110}}, year = {{2025}}, } @inproceedings{64229, abstract = {{ABSTRACT:This paper presents the MBSE-Graph-RAG framework to address key challenges in Model-Based Systems Engineering (MBSE). Traditional MBSE tools suffer from usability barriers, limited accessibility, and integration challenges. By combining knowledge graphs with Retrieval-Augmented Generation (RAG), the proposed framework enables AI-Augmented engineering through natural language interactions and automated system architecture generation. A systematic literature review establishes a solid research foundation, identifying gaps in AI-assisted MBSE. Key contributions include a structured MBSE-Graph interface, improved usability via Large Language Models (LLMs), and automated graph construction aligned with SysML. A proof-of-concept demonstrates the potential of this approach to enhance MBSE by reducing complexity, improving data accessibility, and supporting engineering collaboration.}}, author = {{Hanke, Fabian and Mpidi Bita, Isaac and von Heißen, Oliver and Weller, Julian and Hovemann, Aschot and Dumitrescu, Roman}}, booktitle = {{Proceedings of the Design Society}}, issn = {{2732-527X}}, pages = {{439--448}}, publisher = {{Cambridge University Press (CUP)}}, title = {{{AI-augmented systems engineering: conceptual application of retrieval-augmented generation for model-based systems engineering graph}}}, doi = {{10.1017/pds.2025.10058}}, volume = {{5}}, year = {{2025}}, } @article{64253, abstract = {{This paper presents a comprehensive design framework for Enterprise Architecture aimed at facilitating decision-driven analytics in smart factories. The motivation behind this research lies in challenges faced by manufacturing companies, such as skilled labor shortages and increasing global competition, alongside the imperative for sustainable production. This journal provides a novel approach for designing and documenting prescriptive analytics use cases in manufacturing environments. The framework addresses the need for effective integration of advanced data analytics and prescriptive analytics solutions within existing production environments, thereby enhancing operational efficiency and decision-making processes. A Design Science Research approach is used to iteratively derive a framework based on stakeholder needs and activities along the prescriptive analytics use case development cycle. The resulting framework is demonstrated and evaluated in an IoT Factory setup in a research facility. From a practical perspective, the framework supports manufacturing companies in systematically designing prescriptive analytics use cases. From a research perspective, it contributes to the body of knowledge on Enterprise Architecture Management (EAM) by operationalizing the design of prescriptive analytics use cases in manufacturing contexts. The main contributions of this study include the development of a framework that supports the planning, design, and integration of prescriptive analytics use cases. This framework fosters interdisciplinary collaboration and aids in managing the complexity of data-driven projects.}}, author = {{Weller, Julian and Dumitrescu, Roman}}, issn = {{2079-9292}}, journal = {{Electronics}}, number = {{21}}, publisher = {{MDPI AG}}, title = {{{Decision-Driven Analytics in Smart Factories: Enterprise Architecture Framework for Use Case Specification and Engineering (FUSE)}}}, doi = {{10.3390/electronics14214271}}, volume = {{14}}, year = {{2025}}, } @inproceedings{64252, abstract = {{ABSTRACT:The increasing complexity of modern product and production system development, driven by dynamic market demands, supply chain disruptions and economic pressures, poses significant challenges for companies. Existing methodologies often fall short due to their domain-specific focus, inconsistent terminology and lack of integration. To address these challenges, this paper presents a taxonomy for integrative product and production system development. The taxonomy systematically structures key elements, dependencies and processes to improve collaboration, decision-making and communication within organisations. Developed iteratively the taxonomy identifies ten core artefacts. It enables organisations to better plan improvements, synchronise development processes, and select appropriate methods and tools.}}, author = {{Disselkamp, Jan-Philipp and Seidenberg, Tobias and Westphal, Svenja and Lick, Jonas and Ptock, Lukas and Wyrwich, Fabian and Hovemann, Aschot and Dumitrescu, Roman}}, booktitle = {{Proceedings of the Design Society}}, issn = {{2732-527X}}, pages = {{2121--2130}}, publisher = {{Cambridge University Press (CUP)}}, title = {{{Integrative and Integrated product and production system development: a taxonomy for managing dependencies and processes}}}, doi = {{10.1017/pds.2025.10226}}, volume = {{5}}, year = {{2025}}, } @inproceedings{59517, author = {{Lick, Jonas and Kattenstroth, Fiona and Trienens, Malte and Disselkamp, Jan-Philipp and Kühn, Arno and Dumitrescu, Roman}}, booktitle = {{2024 IEEE International Conference on Technology Management, Operations and Decisions (ICTMOD)}}, publisher = {{IEEE}}, title = {{{Guidance on a Digital Factory Twin: Proposal for a Reference Architecture}}}, doi = {{10.1109/ictmod63116.2024.10878221}}, year = {{2025}}, } @misc{61121, author = {{Peckhaus, Volker}}, booktitle = {{zbMATH Open, Zbl. 08058231}}, title = {{{Franke-Reddig, Julia, „Bernard Bolzano im Kontext der Logikgeschichtsschreibung von Heinrich Scholz“, SieB. Siegener Beiträge zur Geschichte und Philosophie der Mathematik 18 (2024), 155–175}}}, year = {{2025}}, } @inbook{64254, author = {{Dumitrescu, Roman and Riedel, Oliver and Henke, Michael and Metternich, Joachim and Ihlenfeldt, Steffen and Koldewey, Christian}}, booktitle = {{Gaia-X in industriellen Wertschöpfungsnetzwerken – Erkenntnisse aus der Förderlinie InGAIA-X}}, isbn = {{9783186204165}}, publisher = {{VDI Verlag}}, title = {{{Gaia-X in industriellen Wertschöpfungsnetzwerken – Erkenntnisse aus der Förderlinie InGAIA-X}}}, doi = {{10.51202/9783186204165-i}}, year = {{2025}}, } @article{64256, author = {{Rasor, Anja and Koldewey, Christian and Dumitrescu, Roman}}, issn = {{2662-7493}}, journal = {{Nachhaltige Industrie}}, number = {{2}}, pages = {{40--43}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{Mit digitalen Hebeln zur Kreislaufwirtschaft}}}, doi = {{10.1007/s43462-025-1406-x}}, volume = {{6}}, year = {{2025}}, } @proceedings{64257, editor = {{Dumitrescu, Roman and Hölzle, Katharina}}, publisher = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts}}, title = {{{Vorausschau und Technologieplanung - 19. Symposium für Vorausschau und Technologieplanung}}}, doi = {{10.17619/UNIPB/1-2467}}, year = {{2025}}, } @unpublished{64267, abstract = {{Let $\mathbb{H}^n$ be the $n$-dimensional real hyperbolic space, $Δ$ its nonnegative Laplace--Beltrami operator whose bottom of the spectrum we denote by $λ_{0}$, and $σ\in (0,1)$. The aim of this paper is twofold. On the one hand, we determine the Fujita exponent for the fractional heat equation \[\partial_{t} u + Δ^σu = e^{βt}|u|^{γ-1}u,\] by proving that nontrivial positive global solutions exist if and only if $γ\geq 1 + β/ λ_{0}^σ$. On the other hand, we prove the existence of non-negative, bounded and finite energy solutions of the semilinear fractional elliptic equation \[ Δ^σ v - λ^σ v - v^γ=0 \] for $0\leq λ\leq λ_{0}$ and $1<γ< \frac{n+2σ}{n-2σ}$. The two problems are known to be connected and the latter, aside from its independent interest, is actually instrumental to the former. \smallskip At the core of our results stands a novel fractional Poincaré-type inequality expressed in terms of a new scale of $L^{2}$ fractional Sobolev spaces, which sharpens those known so far, and which holds more generally on Riemannian symmetric spaces of non-compact type. We also establish an associated Rellich--Kondrachov-like compact embedding theorem for radial functions, along with other related properties.}}, author = {{Bruno, Tommaso and Papageorgiou, Effie}}, booktitle = {{arXiv:2509.12349}}, title = {{{Blow-up exponents and a semilinear elliptic equation for the fractional Laplacian on hyperbolic spaces}}}, year = {{2025}}, } @unpublished{64266, abstract = {{We study the large-time asymptotic behavior of solutions to the discrete-time heat equation, i.e., caloric functions, on affine buildings, including those without transitive group actions. For each $p \in [1, \infty]$, we introduce a notion of a $p$-mass function and prove that caloric functions with initial data belonging to certain weighted-$\ell^1$ spaces or to the radial $\ell^1$ class, asymptotically decouple as the product of this mass function and the heat kernel. These results extend classical analogues from Euclidean spaces and symmetric spaces of non-compact type to the non-Archimedean setting, and remain valid even for exotic buildings beyond the Bruhat--Tits framework. We characterize the spatial concentration of heat kernels in $p$-norms and describe the geometry of associated critical regions. Our results highlight substantial differences in the asymptotic regimes depending on the value of $p$, and clarify the interplay between volume growth and heat diffusion.}}, author = {{Papageorgiou, Effie and Trojan, Bartosz}}, booktitle = {{arXiv:2506.17042}}, title = {{{Mass Functions and Asymptotic Behavior of Caloric Functions on Affine Buildings}}}, year = {{2025}}, } @article{61932, abstract = {{Substantial improvements in the performance of optical interconnects based on multi-mode fibers are required to support emerging single-channel data transmission rates of 200 Gb/s and 400 Gb/s. Future optical components must combine very high modulation bandwidths—supporting signaling at 100 Gbaud and 200 Gbaud—with reduced spectral width to mitigate chromatic-dispersion-induced pulse broadening and increased brightness to further restrict flux-confining area in multi-mode fibers and thereby increase the effective modal bandwidth (EMB). A particularly promising route to improved performance within standard oxide-confined VCSEL technology is the introduction of multiple isolated or optically coupled oxide-confined apertures, which we refer to collectively as multi-aperture (MA) VCSEL arrays. We show that properly designed MA VCSELs exhibit narrow emission spectra, narrow far-field profiles and extended intrinsic modulation bandwidths, enabling longer-reach data transmission over both multi-mode (MMF) and single-mode fibers (SMF). One approach uses optically isolated apertures with lateral dimensions of approximately 2–3 µm arranged with a pitch of 10–12 µm or less. Such devices demonstrate relaxation oscillation frequencies of around 30 GHz in continuous-wave operation and intrinsic modulation bandwidths approaching 50 GHz. Compared with a conventional single-aperture VCSELs of equivalent oxide-confined area, MA designs can reduce the spectral width (root mean square values < 0.15 nm), lower series resistance (≈50 Ω) and limit junction overheating through more efficient multi-spot heat dissipation at the same total current. As each aperture lases in a single transverse mode, these devices exhibit narrow far-field patterns. In combination with well-defined spacing between emitting spots, they permit tailored restricted launch conditions in MMFs, enhancing effective modal bandwidth. In another MA approach, the apertures are optically coupled such that self-injection locking (SIL) leads to lasing in a single supermode. One may regard one of the supermodes as acting as a master mode controlling the other one. Streak-camera studies reveal post-pulse oscillations in the SIL regime at frequencies up to 100 GHz. MA VCSELs enable a favorable combination of wavelength chirp and chromatic dispersion, extending transmission distances over MMFs beyond those expected for zero-chirp sources and supporting transfer bandwidths up to 60 GHz over kilometer-length SMF links.}}, author = {{Ledentsov, Nikolay N. and Ledentsov, Nikolay and Shchukin, Vitaly A. and Ledentsov, Alexander N. and Makarov, Oleg Yu. and Titkov, Ilya E. and Lindemann, Markus and de Adelsburg Ettmayer, Thomas and Gerhardt, Nils Christopher and Hofmann, Martin R. and Chen, Xin and Hurley, Jason E. and Dong, Hao and Li, Ming-Jun}}, issn = {{2304-6732}}, journal = {{Photonics}}, number = {{10}}, publisher = {{MDPI AG}}, title = {{{VCSELs: Influence of Design on Performance and Data Transmission over Multi-Mode and Single-Mode Fibers}}}, doi = {{10.3390/photonics12101037}}, volume = {{12}}, year = {{2025}}, } @article{61931, abstract = {{Recent research revealed that single-mode vertical-cavity surface-emitting lasers under spin injection (spin-VCSELs) have the potential to revolutionize laser technology for short-haul optical communications. While previous studies have focused solely on single-mode operation, this study introduces multimode spin-VCSELs. We experimentally demonstrate the existence of multi-resonant polarization dynamics when spin is injected, a phenomenon previously unobserved. The development opens the door to significantly faster and more efficient optical communication systems by harnessing the collective behavior of multiple laser modes. Furthermore, we lay the groundwork for understanding multimode operation through the extension of the single-mode spin–flip model, which forms the basis for present and future analyses of multimode spin-laser operation. This work is an important step toward realizing the full potential of spin-VCSELs and, thus, enables significantly improved performance of spin-VCSEL-based optical networks in the future.}}, author = {{Diiankova, Uliana and Drong, Mariusz and Pusch, Tobias and Michalzik, Rainer and Lindemann, Markus and Gerhardt, Nils Christopher and Hofmann, Martin R.}}, issn = {{2378-0967}}, journal = {{APL Photonics}}, number = {{10}}, publisher = {{AIP Publishing}}, title = {{{Multimode vertical-cavity surface-emitting lasers under spin injection}}}, doi = {{10.1063/5.0286998}}, volume = {{10}}, year = {{2025}}, } @article{56717, abstract = {{We establish a multiresolution analysis on the space $\text{Herm}(n)$ of $n\times n$ complex Hermitian matrices which is adapted to invariance under conjugation by the unitary group $U(n).$ The orbits under this action are parametrized by the possible ordered spectra of Hermitian matrices, which constitute a closed Weyl chamber of type $A_{n-1}$ in $\mathbb R^n.$ The space $L^2(\text{Herm}(n))^{U(n)}$ of radial, i.e. $U(n)$-invariant $L^2$-functions on $\text{Herm}(n)$ is naturally identified with a certain weighted $L^2$-space on this chamber. The scale spaces of our multiresolution analysis are obtained by usual dyadic dilations as well as generalized translations of a scaling function, where the generalized translation is a hypergroup translation which respects the radial geometry. We provide a concise criterion to characterize orthonormal wavelet bases and show that such bases always exist. They provide natural orthonormal bases of the space $L^2(\text{Herm}(n))^{U(n)}.$ Furthermore, we show how to obtain radial scaling functions from classical scaling functions on $\mathbb R^{n}$. Finally, generalizations related to the Cartan decompositions for general compact Lie groups are indicated.}}, author = {{Langen, Lukas and Rösler, Margit}}, journal = {{Indagationes Mathematicae}}, number = {{6}}, pages = {{1671--1694}}, publisher = {{Elsevier}}, title = {{{Multiresolution analysis on spectra of hermitian matrices}}}, volume = {{36}}, year = {{2025}}, } @unpublished{64287, abstract = {{The Casselman-Wallach theorem is a foundational result in the theory of representations of real reductive groups connecting algebraic representations to topological representations. We provide a quantitative version of this theorem. For that we introduce the notion of {\it Sobolev gap} for a Harish-Chandra module. This is a new invariant whose finiteness is highly non-trivial. We determine the Sobolev gap for representations in the unitary dual of the group $\SL(2,\R)$ and establish uniform finiteness results in general for representations of the discrete series and the minimal principal series. We use these notions to reformulate and extend classical results of Bernstein and Reznikov concerning automorphic functionals with respect to cocompact lattices. In particular, we prove an abstract convexity bound which applies to automorphic functionals with respect to general lattices in $\SL(2,\R)$ and is independent of the type of unitarizable irreducible Harish-Chandra module. Finally, we offer an extensive list of open problems.}}, author = {{Bernstein, Joseph and Ganguly, Pritam and Krötz, Bernhard and Kuit, Job and Sayag, Eitan}}, title = {{{On norms on Harish-Chandra modules}}}, year = {{2025}}, }