@inproceedings{48843,
  abstract     = {{We contribute to the theoretical understanding of randomized search heuristics for dynamic problems. We consider the classical graph coloring problem and investigate the dynamic setting where edges are added to the current graph. We then analyze the expected time for randomized search heuristics to recompute high quality solutions. This includes the (1+1) EA and RLS in a setting where the number of colors is bounded and we are minimizing the number of conflicts as well as iterated local search algorithms that use an unbounded color palette and aim to use the smallest colors and - as a consequence - the smallest number of colors. We identify classes of bipartite graphs where reoptimization is as hard as or even harder than optimization from scratch, i. e. starting with a random initialization. Even adding a single edge can lead to hard symmetry problems. However, graph classes that are hard for one algorithm turn out to be easy for others. In most cases our bounds show that reoptimization is faster than optimizing from scratch. Furthermore, we show how to speed up computations by using problem specific operators concentrating on parts of the graph where changes have occurred.}},
  author       = {{Bossek, Jakob and Neumann, Frank and Peng, Pan and Sudholt, Dirk}},
  booktitle    = {{Proceedings of the Genetic and Evolutionary Computation Conference}},
  isbn         = {{978-1-4503-6111-8}},
  keywords     = {{dynamic optimization, evolutionary algorithms, running time analysis, theory}},
  pages        = {{1443–1451}},
  publisher    = {{Association for Computing Machinery}},
  title        = {{{Runtime Analysis of Randomized Search Heuristics for Dynamic Graph Coloring}}},
  doi          = {{10.1145/3321707.3321792}},
  year         = {{2019}},
}

@inproceedings{48840,
  abstract     = {{Research has shown that for many single-objective graph problems where optimum solutions are composed of low weight sub-graphs, such as the minimum spanning tree problem (MST), mutation operators favoring low weight edges show superior performance. Intuitively, similar observations should hold for multi-criteria variants of such problems. In this work, we focus on the multi-criteria MST problem. A thorough experimental study is conducted where we estimate the probability of edges being part of non-dominated spanning trees as a function of the edges’ non-domination level or domination count, respectively. Building on gained insights, we propose several biased one-edge-exchange mutation operators that differ in the used edge-selection probability distribution (biased towards edges of low rank). Our empirical analysis shows that among different graph types (dense and sparse) and edge weight types (both uniformly random and combinations of Euclidean and uniformly random) biased edge-selection strategies perform superior in contrast to the baseline uniform edge-selection. Our findings are in particular strong for dense graphs.}},
  author       = {{Bossek, Jakob and Grimme, Christian and Neumann, Frank}},
  booktitle    = {{Proceedings of the Genetic and Evolutionary Computation Conference}},
  isbn         = {{978-1-4503-6111-8}},
  keywords     = {{biased mutation, combinatorial optimization, minimum spanning tree, multi-objective optimization}},
  pages        = {{516–523}},
  publisher    = {{Association for Computing Machinery}},
  title        = {{{On the Benefits of Biased Edge-Exchange Mutation for the Multi-Criteria Spanning Tree Problem}}},
  doi          = {{10.1145/3321707.3321818}},
  year         = {{2019}},
}

@inproceedings{48858,
  abstract     = {{The $$\textbackslash mathcal NP$$-hard multi-criteria shortest path problem (mcSPP) is of utmost practical relevance, e.~g., in navigation system design and logistics. We address the problem of approximating the Pareto-front of the mcSPP with sum objectives. We do so by proposing a new mutation operator for multi-objective evolutionary algorithms that solves single-objective versions of the shortest path problem on subgraphs. A rigorous empirical benchmark on a diverse set of problem instances shows the effectiveness of the approach in comparison to a well-known mutation operator in terms of convergence speed and approximation quality. In addition, we glance at the neighbourhood structure and similarity of obtained Pareto-optimal solutions and derive promising directions for future work.}},
  author       = {{Bossek, Jakob and Grimme, Christian}},
  booktitle    = {{Learning and Intelligent Optimization}},
  editor       = {{Battiti, Roberto and Brunato, Mauro and Kotsireas, Ilias and Pardalos, Panos M.}},
  isbn         = {{978-3-030-05348-2}},
  pages        = {{184–198}},
  publisher    = {{Springer International Publishing}},
  title        = {{{Solving Scalarized Subproblems within Evolutionary Algorithms for Multi-criteria Shortest Path Problems}}},
  doi          = {{10.1007/978-3-030-05348-2_17}},
  year         = {{2019}},
}

@inproceedings{48875,
  abstract     = {{A multiobjective perspective onto common performance measures such as the PAR10 score or the expected runtime of single-objective stochastic solvers is presented by directly investigating the tradeoff between the fraction of failed runs and the average runtime. Multi-objective indicators operating in the bi-objective space allow for an overall performance comparison on a set of instances paving the way for instance-based automated algorithm selection techniques.}},
  author       = {{Bossek, Jakob and Trautmann, Heike}},
  booktitle    = {{Learning and Intelligent Optimization}},
  editor       = {{Battiti, Roberto and Brunato, Mauro and Kotsireas, Ilias and Pardalos, Panos M.}},
  isbn         = {{978-3-030-05348-2}},
  keywords     = {{Algorithm selection, Performance measurement}},
  pages        = {{215–219}},
  publisher    = {{Springer International Publishing}},
  title        = {{{Multi-Objective Performance Measurement: Alternatives to PAR10 and Expected Running Time}}},
  doi          = {{10.1007/978-3-030-05348-2_19}},
  year         = {{2019}},
}

@inproceedings{22041,
  abstract     = {{The Arburg Plastic Freeforming (APF) is an additive manufacturing process that allows three-dimensional, thermoplastic components to be produced in layer by layer. The components are generated by depositing fine, molten plastic droplets. One of the main advantages of the APF process is the open machine control. Thus, the process parameters can be adapted and optimized for the individual applications. The optimization is carried out on the basis of a variation of the process parameters using a statistical design of experiments. Relevant process parameters are the layer thickness, the form factor, the raster and delta angle as well as the overlap between the contour and the filling of a layer. In addition, the nozzle and build chamber temperatures are varied. Using this procedure, the effects of the influencing parameters on the mechanical properties and the interactions between the influencing parameters are analyzed and converted into mathematical models. On the basis of the results and the models, guidelines will be developed to assist the user of APF technology in the systematic process configuration for their own applications. The material used is ABS, one of the most frequently used amorphous thermoplastics in additive manufacturing. The mechanical properties are determined on the basis of tensile tests and the characteristic values tensile strength, elongation at break and Young's modulus. The results should show the performance of the APF technology in regard to the mechanical properties.}},
  author       = {{Moritzer, Elmar and Hirsch, André and Hecker, Felix}},
  booktitle    = {{30th Annual International Solid Freeform Fabrication Symposium}},
  pages        = {{705--714}},
  title        = {{{Process Parameter Optimization to Improve the Mechanical Properties of Arburg Plastic Freeformed Components}}},
  doi          = {{http://dx.doi.org/10.26153/tsw/17308}},
  volume       = {{30}},
  year         = {{2019}},
}

@article{53274,
  abstract     = {{<jats:p>This paper studies the performance of improper Gaussian signaling (IGS) over a 2-user Rayleigh single-input single-output (SISO) interference channel, treating interference as noise. We assume that the receivers have perfect channel state information (CSI), while the transmitters have access to only statistical CSI. Under these assumptions, we consider a signaling scheme, which we refer to as proper/improper Gaussian signaling or PGS/IGS, where at most one user may employ IGS. For the Rayleigh fading channel model, we characterize the statistical distribution of the signal-to-interference-plus-noise ratio at each receiver and derive closed-form expressions for the ergodic rates. By adapting the powers, we characterize the Pareto boundary of the ergodic rate region for the 2-user fading IC. The ergodic transmission rates can be attained using fixed-rate codebooks and no optimization is involved. Our results show that, in the moderate and strong interference regimes, the proposed PGS/IGS scheme improves the performance with respect to the PGS scheme. Additionally, we numerically compute the ergodic rate region of the full IGS scheme when both users can employ IGS and their transmission parameters are optimized by an exhaustive search. Our results suggest that most of the Pareto optimal points for the 2-user fading IC channel are attained when either both users transmit PGS or when one transmits PGS and the other transmits maximally improper Gaussian signals and time sharing is allowed.</jats:p>}},
  author       = {{Soleymani, Mohammad and Santamaria, Ignacio and Lameiro, Christian and Schreier, Peter J.}},
  issn         = {{1099-4300}},
  journal      = {{Entropy}},
  keywords     = {{General Physics and Astronomy}},
  number       = {{10}},
  publisher    = {{MDPI AG}},
  title        = {{{Ergodic Rate for Fading Interference Channels with Proper and Improper Gaussian Signaling}}},
  doi          = {{10.3390/e21100922}},
  volume       = {{21}},
  year         = {{2019}},
}

@article{4684,
  abstract     = {{Recent years have seen the emergence of physical products that are digitally networked with other products and with information systems to enable complex business scenarios in manufacturing, mobility, or healthcare. These “smart products”, which enable the co-creation of “smart service” that is based on monitoring, optimization, remote control, and autonomous adaptation of products, profoundly transform service systems into what we call “smart service systems”. In a multi-method study that includes conceptual research and qualitative data from in-depth interviews, we conceptualize “smart service” and “smart service systems” based on using smart products as boundary objects that integrate service consumers’ and service providers’ resources and activities. Smart products allow both actors to retrieve and to analyze aggregated field evidence and to adapt service systems based on contextual data. We discuss the implications that the introduction of smart service systems have for foundational concepts of service science and conclude that smart service systems are characterized by technology-mediated, continuous, and routinized interactions.}},
  author       = {{Beverungen, Daniel and Müller, Oliver and Matzner, Martin and Mendling, Jan and vom Brocke, Jan}},
  issn         = {{14228890}},
  journal      = {{Electronic Markets}},
  keywords     = {{Boundary object, Internet of things, Service science, Smart products, Smart service}},
  pages        = {{7--18}},
  publisher    = {{SpringerNature}},
  title        = {{{Conceptualizing smart service systems}}},
  doi          = {{10.1007/s12525-017-0270-5}},
  volume       = {{29}},
  year         = {{2019}},
}

@article{53976,
  author       = {{Mousavi, Seyed Mohsen and Tavana, Madjid and Alikar, Najmeh and Zandieh, Mostafa}},
  issn         = {{0941-0643}},
  journal      = {{Neural Computing and Applications}},
  number       = {{3}},
  pages        = {{873--885}},
  publisher    = {{Springer Science and Business Media LLC}},
  title        = {{{A tuned hybrid intelligent fruit fly optimization algorithm for fuzzy rule generation and classification}}},
  doi          = {{10.1007/s00521-017-3115-4}},
  volume       = {{31}},
  year         = {{2019}},
}

@article{53974,
  author       = {{Mousavi, Seyed Mohsen and Alikar, Najmeh and Tavana, Madjid and Di Caprio, Debora}},
  issn         = {{0956-5515}},
  journal      = {{Journal of Intelligent Manufacturing}},
  number       = {{3}},
  pages        = {{1175--1194}},
  publisher    = {{Springer Science and Business Media LLC}},
  title        = {{{An improved particle swarm optimization model for solving homogeneous discounted series-parallel redundancy allocation problems}}},
  doi          = {{10.1007/s10845-017-1311-9}},
  volume       = {{30}},
  year         = {{2019}},
}

@article{53969,
  author       = {{Hajipour, Vahid and Tavana, Madjid and Di Caprio, Debora and Akhgar, Majid and Jabbari, Yasaman}},
  issn         = {{0307-904X}},
  journal      = {{Applied Mathematical Modelling}},
  pages        = {{673--699}},
  publisher    = {{Elsevier BV}},
  title        = {{{An optimization model for traceable closed-loop supply chain networks}}},
  doi          = {{10.1016/j.apm.2019.03.007}},
  volume       = {{71}},
  year         = {{2019}},
}

@inproceedings{46338,
  abstract     = {{We tackle a bi-objective dynamic orienteering problem where customer requests arise as time passes by. The goal is to minimize the tour length traveled by a single delivery vehicle while simultaneously keeping the number of dismissed dynamic customers to a minimum. We propose a dynamic Evolutionary Multi-Objective Algorithm which is grounded on insights gained from a previous series of work on an a-posteriori version of the problem, where all request times are known in advance. In our experiments, we simulate different decision maker strategies and evaluate the development of the Pareto-front approximations on exemplary problem instances. It turns out, that despite severely reduced computational budget and no oracle-knowledge of request times the dynamic EMOA is capable of producing approximations which partially dominate the results of the a-posteriori EMOA and dynamic integer linear programming strategies.}},
  author       = {{Bossek, Jakob and Grimme, Christian and Meisel, Stephan and Rudolph, Günter and Trautmann, Heike}},
  booktitle    = {{Evolutionary Multi-Criterion Optimization (EMO)}},
  editor       = {{Deb, Kalyanmoy and Goodman, Erik and Coello, Coello Carlos A. and Klamroth, Kathrin and Miettinen, Kaisa and Mostaghim, Sanaz and Reed, Patrick}},
  isbn         = {{978-3-030-12597-4}},
  pages        = {{516–528}},
  publisher    = {{Springer International Publishing}},
  title        = {{{Bi-Objective Orienteering: Towards a Dynamic Multi-Objective Evolutionary Algorithm}}},
  doi          = {{10.1007/978-3-030-12598-1_41}},
  volume       = {{11411}},
  year         = {{2019}},
}

@inproceedings{46337,
  abstract     = {{A multiobjective perspective onto common performance measures such as the PAR10 score or the expected runtime of single-objective stochastic solvers is presented by directly investigating the tradeoff between the fraction of failed runs and the average runtime. Multi-objective indicators operating in the bi-objective space allow for an overall performance comparison on a set of instances paving the way for instance-based automated algorithm selection techniques.}},
  author       = {{Bossek, Jakob and Trautmann, Heike}},
  booktitle    = {{Learning and Intelligent Optimization}},
  editor       = {{Battiti, R and Brunato, M and Kotsireas, I and Pardalos, P}},
  isbn         = {{978-3-030-05347-5}},
  pages        = {{215–219}},
  publisher    = {{Springer}},
  title        = {{{Multi-Objective Performance Measurement: Alternatives to PAR10 and Expected Running Time}}},
  volume       = {{11353}},
  year         = {{2019}},
}

@article{36846,
  author       = {{Kruse, Anne and Mummert, Michael}},
  issn         = {{1864-2993}},
  journal      = {{Werkstatt:Dialog}},
  number       = {{4}},
  pages        = {{34--35}},
  title        = {{{Mit 3D-Druck umfassende Teilhabe möglich machen }}},
  year         = {{2019}},
}

@misc{34124,
  abstract     = {{Es existieren bisher zahlreiche Studien, die das Potenzial von Augmented Reality (AR) in verschiedenen Bildungsbereichen und seine Auswirkungen auf die Lernenden hinsichtlich ihrer erhöhten Motivation, verbesserter Lernfähigkeit, Konzentration auf das Thema usw. hervorheben. Dabei eignen sich AR-Anwendungen sowohl für den Einsatz in formellen, als auch informellen Lernumgebungen und Bildungsinstitutionen, beginnend mit Kunstkursen in Vorschulen über Biologie, Geschichte, Chemie, Physik etc. in weiterführenden Schulen und Universitäten [1]. Trotz der steigenden Zahl an Studien liegen nur wenigen AR-Anwendungen ein geeignetes didaktisches Konzept zu Grunde. Ferner fehlen allgemeine Studien, die die lernfördernden Eigenschaften von AR im Bereich der Vorbereitung und Begleitung von Laborpraktika untersuchen. Aktuelle Anwendungen erweitern lediglich gedruckte Lerninhalte mit zusätzlichen Links, Videos oder statischen 3D-Modellen oder benötigen spezielle Voraussetzung für die Nutzung der AR-Anwendung [2]. Der vorliegende Beitrag untersucht und konzentriert sich daher auf ein didaktisches Konzept für eine auf mobilen Geräten basierende AR-Anwendung (App) zum Erwerb und zur Vertiefung praktischer Fertigkeiten im Umgang mit elektrotechnischen Laborgeräten und -komponenten. In einer früheren Arbeit wurden die Möglichkeiten und Grenzen der AR-Technologie in der Ingenieurausbildung mit besonderem Fokus auf Laborarbeit untersucht, um häufige Fehler im Designkonzept zu vermeiden. Das didaktische Grundkonzept beruht auf dem „Constructive Alignement“ nach Biggs [3] mit der Definition der drei obligatorischen Schritte: Lernziele, Lehr- / Lernaktivitäten und Prüfungsmethoden. Die Lernziele werden –  angelehnt an die modifizierte Bloom-Taxonomie nach Anderson und Krathwohl [4] – weiter konkretisiert, woraus dann im weiteren Schritt mögliche Lehrszenarien in AR gestaltet wurden.}},
  author       = {{Alptekin, Mesut and Temmen, Katrin}},
  keywords     = {{Augmented Reality, Laborpraktikum, didaktische Konzepte, Constructive Alignment}},
  publisher    = {{Gudrun Kammasch, Henning Klaf e, Sönke Knutzen (Hrsg.)}},
  title        = {{{Posterbeitrag: Didaktisches Konzept und Prototyp eines auf Augmented Reality basierenden virtuellen Vorpraktikums in der Elektrotechnik}}},
  year         = {{2019}},
}

@article{40582,
  author       = {{Sánchez-Leija, R.J. and Lopez Salas, Nieves and Fierro, J.L.G. and Gutiérrez, M.C. and Ferrer, M.L. and Mota-Morales, J.D. and Luna-Bárcenas, G. and Monte, F. del}},
  issn         = {{0008-6223}},
  journal      = {{Carbon}},
  keywords     = {{General Chemistry, General Materials Science}},
  pages        = {{813--826}},
  publisher    = {{Elsevier BV}},
  title        = {{{Deep eutectic solvents as active media for the preparation of highly conducting 3D free-standing PANI xerogels and their derived N-doped and N-, P-codoped porous carbons}}},
  doi          = {{10.1016/j.carbon.2019.02.055}},
  volume       = {{146}},
  year         = {{2019}},
}

@inproceedings{13297,
  author       = {{Gharibian, Sevag and Parekh, Ojas}},
  booktitle    = {{Proceedings of the 22nd International Workshop on Approximation Algorithms for Combinatorial Optimization Problems (APPROX)}},
  pages        = {{31:1--31:17}},
  title        = {{{Almost Optimal Classical Approximation Algorithms for a Quantum Generalization of Max-Cut}}},
  doi          = {{10.4230/LIPICS.APPROX-RANDOM.2019.31}},
  volume       = {{145}},
  year         = {{2019}},
}

@inproceedings{22202,
  abstract     = {{Structural parts for aviation have very high demands on the development and production process. Therefore, the entire process must be considered in order to produce high-quality AM metal parts. In this case study, a conventional part was selected to be optimized for AM. The process presented includes component selection, design improvement with a novel approach for topology optimization based on the AMendate algorithm as basis of MSC Apex Generative Design,component production on a SLM 250 HL and post-processing including heat treatment and surface smoothing. With the topology optimization a weight reduction of ~60 % could be realized, whereby the stress distribution is more homogeneous. Furthermore, the challenges of support optimization and post-processing have to be addressed, in order to produce competitive parts.}},
  author       = {{Klippstein, Sven Helge and Duchting, Anne and Reiher, Thomas and Hengsbach, F. and Menge, Dennis and Schmid, Hans-Joachim}},
  booktitle    = {{30th Annual International Solid Freeform Fabrication Symposium}},
  pages        = {{1932--1945}},
  title        = {{{Devolopment, Production and post-processing of a topology optimized aircraft bracket }}},
  volume       = {{30}},
  year         = {{2019}},
}

@article{25908,
  abstract     = {{Herein we present a new proton-conducting iron(II) metal–organic framework (MOF) of an unusual structure formed by chains of alternating bistriazolate-p-benzoquinone anions and iron(II) cations with four axially coordinated water molecules. These chains assemble via π–π stacking between the aromatic units to form a three-dimensional grid-like network with channel pores filled with water molecules. The material was structurally characterized by single-crystal XRD analysis, and its water and thermal stability was investigated. The proton conductivity was studied by impedance measurements on needle-like single crystals. A simple but efficient measurement setup consisting of interdigital electrodes was used. The influence of the crystal orientation, temperature, and humidity was investigated. The iron(II)-MOF showed the highest proton conductivity of 3.3·10–3 S cm–1 at 22 °C and 94% relative humidity. Contrary to most known structures, the conductivity in this material is controlled by chemical properties of the pore system rather than by grain boundaries. The presented material is the starting point for further tailoring the proton-conducting properties, independent of morphological features which could find potential applications as membrane materials in proton-exchange membrane fuel cells.}},
  author       = {{Bunzen, Hana and Javed, Ali and Klawinski, Danielle and Lamp, Anton and Grzywa, Maciej and Kalytta-Mewes, Andreas and Tiemann, Michael and von Nidda, Hans-Albrecht Krug and Wagner, Thorsten and Volkmer, Dirk}},
  issn         = {{2574-0970}},
  journal      = {{ACS Applied Nano Materials}},
  pages        = {{291--298}},
  title        = {{{Anisotropic Water-Mediated Proton Conductivity in Large Iron(II) Metal–Organic Framework Single Crystals for Proton-Exchange Membrane Fuel Cells}}},
  doi          = {{10.1021/acsanm.8b01902}},
  year         = {{2019}},
}

@inproceedings{43748,
  abstract     = {{The fundamental interband absorption in gallium arsenide shows a strong blue shift when biased by mid-infrared transients exceeding 10 MV/cm. This subcycle feature is induced by the localization of electronic wavefunctions from 3D to 2D.}},
  author       = {{Meier, Torsten and Bühler, Johannes and Schmidt, Christian and Heinrich, Alexander-Cornelius and Allerbeck, Jonas and Podzimski, Reinold and Berghoff, Daniel and Schmidt, Wolf Gero and Reichl, Christian and Wegscheider, Werner and Brida, Daniele and Leitenstorfer, Alfred}},
  booktitle    = {{XXI International Conference on Ultrafast Phenomena 2018 (UP 2018)}},
  publisher    = {{EDP Sciences}},
  title        = {{{Subcycle Wannier-Stark Localization by Mid-Infrared Bias in Gallium Arsenide}}},
  doi          = {{10.1051/epjconf/201920505001}},
  volume       = {{205}},
  year         = {{2019}},
}

@inproceedings{22441,
  abstract     = {{According to ISO / ASTM 52900, additive manufacturing (AM) is defined as "the process of joining materials to make parts from 3D model data, usually layer upon layer, as opposed to conventional manufacturing including subtractive manufacturing technologies and formative manufacturing methodologies” [1]. This results in significant advantages over conventional manufacturing methodologies, such as the production of topologically optimized, complex structures, lower material consumption or shorter product development cycles. In order to be able to use these advantages, the possibilities and restrictions of the processes must be known. In particular, selective laser beam melting (SLM), in which a powdery metallic starting material is melted by means of a laser, requires a sound understanding of the process. For this purpose, design guidelines have been presented in various scientific papers. These design guidelines help to design a component in such a way that it can be manufactured successfully using additive manufacturing. These so-called “AMsuitable design guidelines” can be found among others at Adam, Kranz and Thomas [2,3,4,5]. In contrast to established manufacturing processes, the post-processing of additive components is divided into two steps. First, the AM immanent post processing, such as the removing of the component from the building platform or the removing of the remaining powder. These post-processing steps are in the following referred to “post-processing”. Secondly, the subsequent post-processing steps to improve the component properties, such as milling and turning or a stress-relief annealing. These are referred to as “finishing” and form the focus of this paper. With regard to a successful finishing of additively manufactured components, design guidelines must be taken into account that consider the finishing inherent restrictions and possibilities. In the following, these design guidelines are referred to “finishing suitable”. They can deviate significantly from those of conventionally manufactured components in the case of additively manufactured components. Although there are some investigations that deal with the post-processing of additively manufactured components [6,7], there are hardly any design guidelines that are suitable for finishing [8]. Therefore, knowledge about the finishing of additively manufactured components is based on experimental experience rather than on scientific knowledge. For this reason, design guidelines for a finishing suitable design must be methodically determined and quantified. These quantified design guidelines can be used for an automated design check on complex components like topology optimized geometries.}},
  author       = {{Lammers, Stefan and Tominski, Johannes and Zimmer, Detmar}},
  booktitle    = {{II International Conference on Simulation for Additive Manufacturing Sim-AM 2019 11-13 September, 2019}},
  isbn         = {{978-84-949194-8-0}},
  pages        = {{174--185}},
  title        = {{{Guidelines for post processing oriented design of additive manufactured parts for use in topology optimization}}},
  doi          = {{http://congress.cimne.com/sim-am2019/frontal/doc/EbookSim-AM2019.pdf}},
  year         = {{2019}},
}