@article{24312, author = {{Vogtschmidt, Sascha and Fiebig, Isabel and Schöppner, Volker}}, journal = {{Joining Plastics}}, number = {{3-4}}, title = {{{Wechseldehnungsschweißen - Entwicklung einer Fügetechnologie für 3D-Geometrien}}}, year = {{2020}}, } @article{24321, author = {{Vogtschmidt, Sascha and Schöppner, Volker}}, journal = {{Welding in the World}}, pages = {{1843--1853}}, title = {{{Vibration welding of components with angled areas in the direction of vibration}}}, volume = {{64}}, year = {{2020}}, } @inbook{21078, author = {{Menke, Peter}}, booktitle = {{Kommunikationsdynamiken zwischen Mündlichkeit und Schriftlichkeit. Festschrift für Barbara Job zum 60. Geburtstag}}, editor = {{Kluge, Bettina and Mihatsch, Wiltrud and Schaller, Birte}}, pages = {{225–244}}, publisher = {{Narr Francke Attempto}}, title = {{{»ich wusste doch irgendwas war zu einfach«. Gesprächsanalytische Betrachtungen von Proberunden zum Lernen von Gesellschaftsspielen}}}, year = {{2020}}, } @article{21281, author = {{Drewel, Marvin and Özcan, Leon and Koldewey, Christian and Gausemeier, Jürgen}}, issn = {{0963-1690}}, journal = {{Creativity and Innovation Management}}, title = {{{Pattern‐based development of digital platforms}}}, doi = {{10.1111/caim.12415}}, year = {{2020}}, } @inproceedings{21380, author = {{Anacker, Harald and Dumitrescu, Roman and Kharatyan, Aschot and Lipsmeier, Andre}}, booktitle = {{Proceedings of the Design Society}}, location = {{Cavtat}}, pages = {{1195--1204}}, title = {{{Pattern based systems engineering – application of solution patterns in the design of intelligent technical systems}}}, year = {{2020}}, } @inproceedings{21381, author = {{Lipsmeier, Andre and Kühn, Arno and Joppen, Robert and Dumitrescu, Roman}}, booktitle = {{Procedia CIRP}}, number = {{88}}, pages = {{173--178}}, title = {{{Process for the development of a digital strategy}}}, year = {{2020}}, } @inproceedings{21384, author = {{Röltgen, Daniel and Dumitrescu, Roman}}, booktitle = {{Procedia CIRP}}, number = {{91}}, pages = {{93--100}}, title = {{{Classification of Industrial Augmented Reality Use Cases}}}, year = {{2020}}, } @inproceedings{21385, author = {{Hobscheidt, Daniela and Kühn, Arno and Dumitrescu, Roman}}, booktitle = {{Procedia CIRP}}, number = {{91}}, pages = {{832–837}}, title = {{{Development of risk-optimized implementation paths for Industry 4.0 based on socio-technical pattern}}}, year = {{2020}}, } @inproceedings{21386, author = {{Wortmann, Fabio and Ellermann, Kai and Kühn, Arno and Dumitrescu, Roman}}, booktitle = {{Procedia CIRP}}, number = {{91}}, pages = {{559--564}}, title = {{{Ideation for digital platforms based on a companies‘ ecosystem}}}, year = {{2020}}, } @inproceedings{21389, author = {{Hillebrand, Michael and Greinert, Matthias and Herzog, Otthein and Dumitrescu, Roman}}, booktitle = {{Proceedings of the 2020 IEEE 15th International Conference of System of Systems Engineering (SoSE)}}, location = {{Budapest}}, pages = {{163--168}}, title = {{{Advanced Monkey Testing for connected autonomous systems}}}, year = {{2020}}, } @inproceedings{21392, author = {{Henkenjohann, Mark and Joppen, Robert and Köchling, Daniel and von Enzberg, Sebastian and Kühn, Arno and Dumitrescu, Roman}}, booktitle = {{Procedia CIRP}}, location = {{Gulf of Naples}}, title = {{{Identification and specification of standard modules in production for a material flow simulation}}}, year = {{2020}}, } @inproceedings{21394, author = {{Grote, Eva-Maria and Pfeifer, Stefan and Röltgen, Daniel and Kühn, Arno and Dumitrescu, Roman}}, booktitle = {{Proceedings of the 2020 IEEE International Symposium on Systems Engineering}}, location = {{Wien}}, title = {{{Towards defining role models in Advanced Systems Engineering}}}, year = {{2020}}, } @inbook{21396, abstract = {{Verifiable random functions (VRFs) are essentially digital signatures with additional properties, namely verifiable uniqueness and pseudorandomness, which make VRFs a useful tool, e.g., to prevent enumeration in DNSSEC Authenticated Denial of Existence and the CONIKS key management system, or in the random committee selection of the Algorand blockchain. Most standard-model VRFs rely on admissible hash functions (AHFs) to achieve security against adaptive attacks in the standard model. Known AHF constructions are based on error-correcting codes, which yield asymptotically efficient constructions. However, previous works do not clarify how the code should be instantiated concretely in the real world. The rate and the minimal distance of the selected code have significant impact on the efficiency of the resulting cryptosystem, therefore it is unclear if and how the aforementioned constructions can be used in practice. First, we explain inherent limitations of code-based AHFs. Concretely, we assume that even if we were given codes that achieve the well-known Gilbert-Varshamov or McEliece-Rodemich-Rumsey-Welch bounds, existing AHF-based constructions of verifiable random functions (VRFs) can only be instantiated quite inefficiently. Then we introduce and construct computational AHFs (cAHFs). While classical AHFs are information-theoretic, and therefore work even in presence of computationally unbounded adversaries, cAHFs provide only security against computationally bounded adversaries. However, we show that cAHFs can be instantiated significantly more efficiently. Finally, we use our cAHF to construct the currently most efficient verifiable random function with full adaptive security in the standard model.}}, author = {{Jager, Tibor and Niehues, David}}, booktitle = {{Lecture Notes in Computer Science}}, isbn = {{9783030384708}}, issn = {{0302-9743}}, keywords = {{Admissible hash functions, Verifiable random functions, Error-correcting codes, Provable security}}, location = {{Waterloo, Canada}}, title = {{{On the Real-World Instantiability of Admissible Hash Functions and Efficient Verifiable Random Functions}}}, doi = {{10.1007/978-3-030-38471-5_13}}, year = {{2020}}, } @article{17358, abstract = {{Approximate circuits trade-off computational accuracy against improvements in hardware area, delay, or energy consumption. IP core vendors who wish to create such circuits need to convince consumers of the resulting approximation quality. As a solution we propose proof-carrying approximate circuits: The vendor creates an approximate IP core together with a certificate that proves the approximation quality. The proof certificate is bundled with the approximate IP core and sent off to the consumer. The consumer can formally verify the approximation quality of the IP core at a fraction of the typical computational cost for formal verification. In this paper, we first make the case for proof-carrying approximate circuits and then demonstrate the feasibility of the approach by a set of synthesis experiments using an exemplary approximation framework.}}, author = {{Witschen, Linus Matthias and Wiersema, Tobias and Platzner, Marco}}, issn = {{1557-9999}}, journal = {{IEEE Transactions On Very Large Scale Integration Systems}}, keywords = {{Approximate circuit synthesis, approximate computing, error metrics, formal verification, proof-carrying hardware}}, number = {{9}}, pages = {{2084 -- 2088}}, publisher = {{IEEE}}, title = {{{Proof-carrying Approximate Circuits}}}, doi = {{10.1109/TVLSI.2020.3008061}}, volume = {{28}}, year = {{2020}}, } @article{17390, author = {{Chantakit, Teanchai and Schlickriede, Christian and Sain, Basudeb and Meyer, Fabian and Weiss, Thomas and Chattham, Nattaporn and Zentgraf, Thomas}}, issn = {{2327-9125}}, journal = {{Photonics Research}}, number = {{9}}, pages = {{1435--1440}}, publisher = {{OSA}}, title = {{{All-dielectric silicon metalens for two-dimensional particle manipulation in optical tweezers}}}, doi = {{10.1364/prj.389200}}, volume = {{8}}, year = {{2020}}, } @article{17523, abstract = {{Compact and robust cold atom sources are increasingly important for quantum research, especially for transferring cutting-edge quantum science into practical applications. In this study, we report on a novel scheme that uses a metasurface optical chip to replace the conventional bulky optical elements used to produce a cold atomic ensemble with a single incident laser beam, which is split by the metasurface into multiple beams of the desired polarization states. Atom numbers ~107 and temperatures (about 35 μK) of relevance to quantum sensing are achieved in a compact and robust fashion. Our work highlights the substantial progress toward fully integrated cold atom quantum devices by exploiting metasurface optical chips, which may have great potential in quantum sensing, quantum computing, and other areas.}}, author = {{Zhu, Lingxiao and Liu, Xuan and Sain, Basudeb and Wang, Mengyao and Schlickriede, Christian and Tang, Yutao and Deng, Junhong and Li, Kingfai and Yang, Jun and Holynski, Michael and Zhang, Shuang and Zentgraf, Thomas and Bongs, Kai and Lien, Yu-Hung and Li, Guixin}}, issn = {{2375-2548}}, journal = {{Science Advances}}, number = {{31}}, publisher = {{American Association for the Advancement of Science}}, title = {{{A dielectric metasurface optical chip for the generation of cold atoms}}}, doi = {{10.1126/sciadv.abb6667}}, volume = {{6}}, year = {{2020}}, } @inbook{23801, author = {{Reitz, Alexander and Grydin, Olexandr and Schaper, Mirko}}, booktitle = {{The Minerals, Metals & Materials Series}}, issn = {{2367-1181}}, publisher = {{Springer}}, title = {{{Phase Transformation Characterization by Means of High Temperature Digital Image Correlation for Graded Thermo-Mechanical Processing of Sheet Parts}}}, doi = {{10.1007/978-3-030-36628-5_7}}, year = {{2020}}, } @inproceedings{23865, abstract = {{Regarding the design of single screw extruders, the prediction of the throughput needs to be of high accuracy. The calculation of the solids conveying throughput is particularly important for extruders with a grooved feed section. In contrast to smooth barrel extruders the throughput of the entire plant is determined at the feed section. Various simplifications are necessary for an analytical modelling of the solids conveying, e.g. the classification into conveying cases, the assumption of solid block flow and the assumption of pressure anisotropy coefficients. In numerical simulations with the Discrete Element Method (DEM), which has recently been successfully used to describe solids conveying in smooth barrel extruders, the simplifications mentioned above are not taken into account. Here, the pellets are approximated as spherical particles or particles composed of spheres. Based on virtual overlaps, contact models and the solution of Newton's equations of motion, a more complex consideration of the pellet flow is possible. In each iteration step of the simulation, the particle velocities, contact forces and derived quantities, e.g. the mass throughput in the screw channel and the grooves or the radial pressure build-up along the grooved barrel can be evaluated. Therefore, a DEM simulation model can be investigated by means of statistical design of experiments in order to convert the target values into a metamodel by regression. Long computation times of numerical simulations will be avoided in this matter as well as too simple assumptions of analytical approaches. The influencing parameters to be simulated are divided into material, geometry and process parameters. Relevant material parameters are the coefficients of friction of the polymer-polymer and polymer-steel surface as well as the restitution coefficient and the particle diameter. The geometry is varied in the form of the screw diameter, the channel depth and pitch, the number of grooves and their width, depth and angle. By varying the angle, both conventional axial grooves and helical grooves are taken into account. Finally, the process parameters speed and backpressure are also considered in the simulations. In order to reduce the simulation effort, irrelevant parameters are identified in preliminary investigations. }}, author = {{Schöppner, Volker and Brüning, Florian}}, booktitle = {{Advances in Polymer Processing 2020: Proceedings of the International Symposium on Plastics Technology}}, editor = {{Hopmann, Christian and Dahlmann, Rainer}}, publisher = {{Springer}}, title = {{{Development of a Solids Conveying Throughput Model for Grooved Barrel Extruders based on Discrete Element Simulations}}}, year = {{2020}}, } @inproceedings{20355, author = {{Koldewey, Christian and Gausemeier, Jürgen and Chohan, Nadia and Frank, Maximilian and Reinhold, Jannik and Dumitrescu, Roman}}, booktitle = {{Proceedings of the IEEE International Conference on Technology Management, Operations and Decisions ”Disruptive Technologies and Social Impacts”}}, location = {{Marrakesch, Marocco}}, title = {{{Aligning Strategy and Structure for Smart Service Businesses in Manufacturing}}}, year = {{2020}}, } @article{20363, abstract = {{Die Verfügbarkeit von Daten aus dem Betrieb hat durch die Einführung von vernetzten intelligenten Fertigungssystemen (cyber-physische Systeme) stark zugenommen. Hieraus eröffnen sich Erfolg versprechende Möglichkeiten für Smart Services und damit verbundene neue Geschäftsfelder. Voraussetzung für den Eintritt in ein neues Geschäft mit Smart Services ist eine fundierte Geschäftsstrategie. Wir zeigen die zentralen Gestaltungsfelder von Smart Service-Strategien auf und erläutern, wie sechs von uns ermittelte Normstrategien bei der Formulierung einer attraktiven Strategie helfen können.}}, author = {{Koldewey, Christian and Frank, Maximilian and Gausemeier, Jürgen and Bäsecke, Alexander and Reinhold, Jannik and Dumitrescu, Roman}}, journal = {{ZWF Zeitschrift für wirtschaftliche Fabrikplanung}}, keywords = {{Smart Service, Digitalisierung, Industrie 4.0}}, number = {{7-8}}, pages = {{524--528}}, publisher = {{Hanser}}, title = {{{Systematische Entwicklung von Normstrategien für Smart Services}}}, doi = {{10.3139/104.112297}}, volume = {{115}}, year = {{2020}}, }