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Significance and Challenges of Data-driven Product Generation and Retrofit Planning

Procedia CIRP 2019年 84卷 992-997页

作者： Melina Massmann Maurice Meyer Roman Dumitrescu Sebastian von Enzberg Maximilian Frank Christian Koldewey Arno Kühn Jannik Reinhold Chair Advanced Systems Engineering Heinz Nixdorf Institute University of Paderborn Fürstenallee 11 33102 Paderborn Germany Fraunhofer IEM Zukunftsmeile 1 33102 Paderborn Germany

One of the notable drivers of the fourth industrial revolution is the collection of vast amounts of data along the entire lifecycle of a product. The analysis of product lifecycle data in conjunction with product hypotheses leads to promising potentials in strategic product planning. In this thesis paper, we postulate the need for data-driven product generation and retrofit planning as an interdisciplinary field of research. We define and analyze the key concepts and derive requirements in a structured way. Based on an exhaustive research of existing approaches, we structure open research questions and propose a roadmap in order to shape future research efforts.

关键词： Data-driven Product Planning Industrial Data Analytics Lifecycle Analytics Generation Retrofit Planning

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High repetition rate high harmonic generation with ultra-high photon flux

High repetition rate high harmonic generation with ultra-hig...

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Advanced Solid State Lasers, ASSL 2020 - Part of Laser Congress, LAC 2020

作者： Tschernajew, Maxim Hädrich, Steffen Klas, Robert Gebhardt, Martin Horsten, Roland Weerdenburg, Sven Pyatchenkov, Sergey Coene, Wim Rothhardt, Jan Eidam, Tino Limpert, Jens Active Fiber Systems GmbH Ernst-Ruska-Ring 17 Jena07745 Germany Institute of Applied Physics Abbe Center of Photonics Friedrich-Schiller-Universität Jena Albert-Einstein-Str. 15 Jena07745 Germany Helmholtz-Institute Jena Fröbelstieg 3 Jena07743 Germany Optics Research Group Delft University of Technology Delft2628 CH Netherlands ASML Netherlands B.V. P.O. Box 324 AH Veldhoven5500 Netherlands Fraunhofer Institute for Applied Optics and Precision Engineering Albert-Einstein-Str. 7 Jena07745 Germany

A 100W fiber laser system is used to drive a high repetition rate HHG beamline producing record-high photon flux of >1011 photons/s at 69-75eV and >1010 photons/s for harmonics between 115eV and 140eV. © 20... 详细信息

ISBN: (纸本)9781557528209

关键词： Photons

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Maturity model-based planning of cyber-physical systems in the machinery and plant engineering industry 15

Maturity model-based planning of cyber-physical systems in t...

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15th International Design Conference, DESIGN 2018

作者： Westermann, T. Dumitrescu, R. Product-Service-Systems Fraunhofer Research Institute for Mechatronic Systems Design IEM Product Engineering Zukunftsmeile 1 Paderborn33102 Germany

ISBN: (纸本)9789537738594

Cyber-physical systems (CPS) are networked, intelligent technical systems that interact with the physical and digital world alike. Companies now increasingly face the challenge of rapidly and consistently exploiting the emerging opportunities of this development. A prerequisite for this is a clear picture of the current position of products, the target position and first concrete steps towards the target projection. The contribution at hand shows an approach for the maturity model-based planning of cyber-physical systems in the machinery and plant engineering industry. © 2018 Faculty of Mechanical engineering and Naval Architecture. All rights reserved.

关键词： Cyber Physical System

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Fuzzing of Mobile Application in the Banking Domain: a Case Study

Fuzzing of Mobile Application in the Banking Domain: a Case ...

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IEEE International Conference on Software Quality, Reliability and Security Companion (QRS-C)

作者： Martin A. Schneider Marc-Florian Wendland Abdurrahman Akin Serafettin Sentürk Business Unit Quality Engineering (SQC) Fraunhofer Institute for Open Communication Systems Berlin Germany Research and Development (R&D) Center Kuveyt Türk Participation Bank Inc. Kocaeli Turkey Cyber Security Institute Tübitak Informatics and Information Security Research Center Kocaeli Turkey

ISBN: (数字)9781728189154

ISBN: (纸本)9781728189161

Mobile applications are today ubiquitous, and everybody uses them on a daily basis. This applies also to security-critical mobile applications such as online banking apps. In today's architectures, these mobile applications are usually fed from the same source as mobile applications on smart phones, i.e. web services. This makes security testing of web services inevitable. Furthermore, regulation increases and requires stronger security mechanisms as with the strong customer authentication from the Revised European Payment Services Directive (PSD2). Automated security testing is a way to cope with the increasing requirements on assuring the security of such web services and their implemented security controls whilst dealing with decreasing resources for such efforts. In this paper, we present our experiences from a case study provided by Kuveyt Türk Bank performed within the ITEA-3 project TESTOMAT where we introduced automated security testing in terms of fuzzing to complement manual security testing.

关键词： Software quality Fuzzing Mobile applications Software reliability Security Smart phones Testing

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Frequency Comb Generation via Cascaded Second-Order Nonlinearities in Microresonators

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Physical Review Letters 2020年第20期124卷 203902-203902页

作者： Jan Szabados Danila N. Puzyrev Yannick Minet Luis Reis Karsten Buse Alberto Villois Dmitry V. Skryabin Ingo Breunig Laboratory for Optical Systems Department of Microsystems Engineering—IMTEK University of Freiburg Georges-Köhler-Allee 102 79110 Freiburg Germany Department of Physics University of Bath Bath BA2 7AY United Kingdom Gisela and Erwin Sick Chair of Micro-optics Department of Microsystems Engineering—IMTEK University of Freiburg Georges-Köhler-Allee 102 79110 Freiburg Germany Fraunhofer Institute for Physical Measurement Techniques IPM Heidenhofstraße 8 79110 Freiburg Germany

Optical frequency combs are revolutionizing modern time and frequency metrology. In the past years, their range of applications has increased substantially, driven by their miniaturization through microresonator-based solutions. The combs in such devices are typically generated using the third-order χ(3) nonlinearity of the resonator material. An alternative approach is making use of second-order χ(2) nonlinearities. While the idea of generating combs this way has been around for almost two decades, so far only few demonstrations are known, based either on bulky bow-tie cavities or on relatively low-Q waveguide resonators. Here, we present the first such comb that is based on a millimeter-sized microresonator made of lithium niobate, that allows for cascaded second-order nonlinearities. This proof-of-concept device comes already with pump powers as low as 2 mW, generating repetition-rate-locked combs around 1064 and 532 nm. From the nonlinear dynamics point of view, the observed combs correspond to Turing roll patterns.

关键词： Nonlinear optics Optical microcavities Second order nonlinear optical processes Whispering gallery mode resonators

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Frequency comb generation threshold in χ(2) optical microresonators

arXiv

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arXiv 2020年

作者： Szabados, Jan Sturman, Boris Breunig, Ingo Laboratory for Optical Systems Department for Microsystems Engineering - IMTEK University of Freiburg Georges-Köhler-Allee 102 Freiburg79110 Germany Institute of Automation and Electrometry Russian Academy of Sciences Koptyug Avenue 1 Novosibirsk630090 Russia Fraunhofer Institute for Physical Measurement Techniques IPM Heidenhofstraße 8 Freiburg79110 Germany

We investigate the threshold of χ(2) frequency comb generation in lithium niobate whispering gallery microresonators theoretically and experimentally. When generating a frequency comb via second-harmonic generation, the threshold for the onset of cascaded second-order processes leading to a comb is found to be approximately 85 µW. The second-harmonic generation efficiency up to this value is in excellent agreement with a previously known theoretical framework. This framework is extended here, showing that the onset of cascaded χ(2) processes and the maximum of the second-harmonic generation efficiency coincide. Furthermore, we observe that the frequency distance between the comb lines is a function of the pump power. It changes from 4 free spectral ranges at the oscillation threshold to 1 free spectral range at 590 µW. Copyright © 2020, The Authors. All rights reserved.

关键词： Harmonic generation

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Potential for Machine Learning in Optimized Production Planning with Hybrid Simulation

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Procedia Manufacturing 2019年 39卷 1844-1853页

作者： Thomas Sobottka Felix Kamhuber Mohammadali Faezirad Wilfried Sihn Fraunhofer Austria Research GmbH Vienna 1040 Austria TU Wien Institute of Management Science Department of Industrial and Systems Engineering Vienna 1040 Austria Ferdowsi University of Mashhad Iran

Advanced production planning and scheduling approaches increasingly rely on simulation-based optimization methods. This entails the problem of a high computational effort due to complex models, resulting in limitations for the practical application of otherwise powerful methods. While machine-learning methods offer a potential for performance improvement, approaches for real-life applications with a high complexity are still lacking. This paper explores the potential for machine learning, especially artificial neural networks, used as surrogate models, to improve the performance of a recently developed planning method for real life production planning applications. The simulation considered in this paper is a complex hybrid discrete-continuous model, enabling the method to pursue energy efficiency simultaneously with economic goals, in a complex multi-criteria goal system. The artificial neural network is trained via offline learning and is meant to provide a computationally cheap evaluation of intermediate planning solutions, compiled by an optimization algorithm during an optimization run. The approach is developed and evaluated in a case-study on the food industry, indicating a basic feasibility of the approach but also pointing out necessary future challenges to be solved towards practical applicability.

关键词： Simulation Optimization Production Planning Control Machine Learning Neural Networks

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Parameter Identification in Cyclic Voltammetry of Alkaline Methanol Oxidation 8

Parameter Identification in Cyclic Voltammetry of Alkaline M...

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8th International Conference on Simulation and Modeling Methodologies, Technologies and Applications, SIMULTECH 2018

作者： Clees, Tanja Nikitin, Igor Nikitina, Lialia Pott, Sabine Krewer, Ulrike Haisch, Theresa Fraunhofer Institute for Algorithms and Scientific Computing Sankt Augustin Germany Institute of Energy and Process Systems Engineering Technical University Braunschweig Germany

ISBN: (纸本)9789897583230

Alkaline methanol oxidation is an electrochemical process, perspective for the design of efficient high energy density fuel cells. The process involves a large number of elementary reactions, forming a complex reaction graph, and it is described by a system of non-linear differential equations of high order. The purpose of parameter identification is a reconstruction of reaction constants in this model on the basis of available experimental data. Cyclic voltammetry, a measurement of dynamical current-voltage characteristic of the cell, is especially suitable for analysis of electrochemical kinetics. In this paper we present several approaches for parameter identification in cyclic voltammetry of alkaline methanol oxidation. With the aid of global optimization methods and interactive parameter study we find four islands of solutions in parameter space, corresponding to different chemical mechanisms of the process. The main features of solutions are discussed and the reconstructed reaction constants are presented. Copyright © 2018 by SCITEPRESS-Science and Technology Publications, Lda. All rights reserved.

关键词： Differential equations

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A conceptual model of benchmarking data and its implications for data mapping in the data economy

A conceptual model of benchmarking data and its implications...

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Multikonferenz Wirtschaftsinformatik, MKWI 2018 - Multiconference on Business Informatics, MKWI 2018

作者： Spiekermann, Markus Wenzel, Sven Otto, Boris Fraunhofer Institute for Software and Systems Engineering ISST Dortmund Germany TU Dortmund Net Order Management Dortmund Germany

ISBN: (纸本)9783935786720

Digitalization of the economy requires enterprises from all industries to revisit their current business models and prepare their organizations for the digital age. One task is the (re-)design of hybrid and digital products and services. The foundation builds the improved interchangeability of data and the availability of external data sources through data markets and platforms. This leads to the requirement of a structured decision-making while mapping data sources to digital products. In order to successfully transform their business and develop valuable new products, companies require methodological help. This paper proposes a high-level conceptual model for the assessment of data sources value. It consists of an approach for comparing data sources based on a common description of data and individual metrics definition enable a benchmark process. The development of the model and its practicability has been validated in a case study with an industrial partner. © 2018 Leuphana Universitat Luneburg. All rights reserved.

关键词： Decision making

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Photonic Crystal THz High-Q Resonator for Chipless Wireless Identification 1

Photonic Crystal THz High-Q Resonator for Chipless Wireless ...

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1st International Workshop on Mobile Terahertz systems, IWMTS 2018

作者： Jiménez-Sáez, Alejandro Schüßler, Martin Krause, Christopher Meyer, Frederic Bögel, Gerd Vom Jakoby, Rolf Technische Universität Darmstadt Institute of Microwave Engineering and Photonics Darmstadt Germany Fraunhofer Institute for Microelectronic Circuits and Systems Duisburg Germany

ISBN: (纸本)9781538612217

In this paper, the considerations and simulations made for the design and characterization of a high-Q resonator for wireless identification at 90 GHz are presented with the perspective to extend them to the low THz range. The designed resonator in high-resistive silicon has a quality factor of 700 and different simulation methods close to real measurement scenarios are shown to demonstrate the potential of the presented topology for the generation of identifications that can be wirelessly read in the low THz frequency range. © 2018 IEEE.

关键词： Resonators

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