@phdthesis{neeZoeckler2003, author = {(n{\´e}e Z{\"o}ckler), Malte}, title = {Efficient Visualization and Reconstruction of 3D Geometric from Neuro-Biological Confocal Microscope Scans}, year = {2003}, language = {en} } @misc{AardalHoeselKosteretal., author = {Aardal, Karen I. and Hoesel, Stan P.M. van and Koster, Arie M.C.A. and Mannino, Carlo and Sassano, Antonio}, title = {Models and Solution Techniques for Frequency Assignment Problems}, url = {http://nbn-resolving.de/urn:nbn:de:0297-zib-6667}, number = {01-40}, abstract = {{\begin{rawhtml} Revised Version unter http://dx.doi.org/10.1007/s10479-007-0178-0 \end{rawhtml}} Wireless communication is used in many different situations such as mobile telephony, radio and TV broadcasting, satellite communication, and military operations. In each of these situations a frequency assignment problem arises with application specific characteristics. Researchers have developed different modelling ideas for each of the features of the problem, such as the handling of interference among radio signals, the availability of frequencies, and the optimization criterion. This survey gives an overview of the models and methods that the literature provides on the topic. We present a broad description of the practical settings in which frequency assignment is applied. We also present a classification of the different models and formulations described in the literature, such that the common features of the models are emphasized. The solution methods are divided in two parts. Optimization and lower bounding techniques on the one hand, and heuristic search techniques on the other hand. The literature is classified according to the used methods. Again, we emphasize the common features, used in the different papers. The quality of the solution methods is compared, whenever possible, on publicly available benchmark instances.}, language = {en} } @article{AbassGutscheMaesetal., author = {Abass, Aimi and Gutsche, Philipp and Maes, Bjorn and Rockstuhl, Carsten and Martins, Emiliano R}, title = {Insights into directional scattering: from coupled dipoles to asymmetric dimer nanoantennas}, series = {Opt. Express}, volume = {24}, journal = {Opt. Express}, number = {17}, doi = {10.1364/OE.24.019638}, pages = {19638 -- 19650}, abstract = {Strong and directionally specific forward scattering from optical nanoantennas is of utmost importance for various applications in the broader context of photovoltaics and integrated light sources. Here, we outline a simple yet powerful design principle to perceive a nanoantenna that provides directional scattering into a higher index substrate based on the interference of multiple electric dipoles. A structural implementation of the electric dipole distribution is possible using plasmonic nanoparticles with a fairly simple geometry, i.e. two coupled rectangular nanoparticles, forming a dimer, on top of a substrate. The key to achieve directionality is to choose a sufficiently large size for the nanoparticles. This promotes the excitation of vertical electric dipole moments due to the bi-anisotropy of the nanoantenna. In turn, asymmetric scattering is obtained by ensuring the appropriate phase relation between the vertical electric dipole moments. The scattering strength and angular spread for an optimized nanoantenna can be shown to be broadband and robust against changes in the incidence angle. The scattering directionality is maintained even for an array configuration of the dimer. It only requires the preferred scattering direction of the isolated nanoantenna not to be prohibited by interference.}, language = {en} } @article{AbbasSchneiderBollmannetal., author = {Abbas, Aennes and Schneider, Ilona and Bollmann, Anna and Funke, Jan and Oehlmann, J{\"o}rg and Prasse, Carsten and Schulte-Oehlmann, Ulrike and Seitz, Wolfram and Ternes, Thomas and Weber, Marcus and Wesely, Henning and Wagner, Martin}, title = {What you extract is what you see: Optimising the preparation of water and wastewater samples for in vitro bioassays}, series = {Water Research}, volume = {152}, journal = {Water Research}, doi = {10.1016/j.watres.2018.12.049}, pages = {47 -- 60}, abstract = {The assessment of water quality is crucial for safeguarding drinking water resources and ecosystem integrity. To this end, sample preparation and extraction is critically important, especially when investigating emerging contaminants and the toxicity of water samples. As extraction methods are rarely optimised for bioassays but rather adopted from chemical analysis, this may result in a misrepresentation of the actual toxicity. In this study, surface water, groundwater, hospital and municipal wastewater were used to characterise the impacts of common sample preparation techniques (acidification, filtration and solid phase extraction (SPE)) on the outcomes of eleven in vitro bioassays. The latter covered endocrine activity (reporter gene assays for estrogen, androgen, aryl-hydrocarbon, retinoic acid, retinoid X, vitamin D, thyroid receptor), mutagenicity (Ames fluctuation test), genotoxicity (umu test) and cytotoxicity. Water samples extracted using different SPE sorbents (Oasis HLB, Supelco ENVI-Carb+, Telos C18/ENV) at acidic and neutral pH were compared for their performance in recovering biological effects. Acidification, commonly used for stabilisation, significantly altered the endocrine activity and toxicity of most (waste)water samples. Sample filtration did not affect the majority of endpoints but in certain cases affected the (anti-)estrogenic and dioxin-like activities. SPE extracts (10.4 × final concentration), including WWTP effluents, induced significant endocrine effects that were not detected in aqueous samples (0.63 × final concentration), such as estrogenic, (anti-)androgenic and dioxin-like activities. When ranking the SPE methods using multivariate Pareto optimisation an extraction with Telos C18/ENV at pH 7 was most effective in recovering toxicity. At the same time, these extracts were highly cytotoxic masking the endpoint under investigation. Compared to that, extraction at pH 2.5 enriched less cytotoxicity. In summary, our study demonstrates that sample preparation and extraction critically affect the outcome of bioassays when assessing the toxicity of water samples. Depending on the water matrix and the bioassay, these methods need to be optimised to accurately assess water quality.}, language = {en} } @book{AbbinkBaermannBešinovicetal., author = {Abbink, Erwin and B{\"a}rmann, Andreas and Bešinovic, Nikola and Bohlin, Markus and Cacchiani, Valentina and Caimi, Gabrio and de Fabris, Stefano and Dollevoet, Twan and Fischer, Frank and F{\"u}genschuh, Armin and Galli, Laura and Goverde, Rob M.P. and Hansmann, Ronny and Homfeld, Henning and Huisman, Dennis and Johann, Marc and Klug, Torsten and T{\"o}rnquist Krasemann, Johanna and Kroon, Leo and Lamorgese, Leonardo and Liers, Frauke and Mannino, Carlo and Medeossi, Giorgio and Pacciarelli, Dario and Reuther, Markus and Schlechte, Thomas and Schmidt, Marie and Sch{\"o}bel, Anita and Sch{\"u}lldorf, Hanno and Stieber, Anke and Stiller, Sebastian and Toth, Paolo and Zimmermann, Uwe}, title = {Handbook of Optimization in the Railway Industry}, volume = {268}, editor = {Bornd{\"o}rfer, Ralf and Klug, Torsten and Lamorgese, Leonardo and Mannino, Carlo and Reuther, Markus and Schlechte, Thomas}, publisher = {Springer Verlag}, isbn = {978-3-319-72152-1}, doi = {10.1007/978-3-319-72153-8}, abstract = {This book promotes the use of mathematical optimization and operations research methods in rail transportation. The editors assembled thirteen contributions from leading scholars to present a unified voice, standardize terminology, and assess the state-of-the-art. There are three main clusters of articles, corresponding to the classical stages of the planning process: strategic, tactical, and operational. These three clusters are further subdivided into five parts which correspond to the main phases of the railway network planning process: network assessment, capacity planning, timetabling, resource planning, and operational planning. Individual chapters cover: Simulation Capacity Assessment Network Design Train Routing Robust Timetabling Event Scheduling Track Allocation Blocking Shunting Rolling Stock Crew Scheduling Dispatching Delay Propagation}, language = {en} } @article{AbbottStraubeAartsetal., author = {Abbott, Joshua L. and Straube, Arthur and Aarts, Dirk G. A. L. and Dullens, Roel P. A.}, title = {Transport of a colloidal particle driven across a temporally oscillating optical potential energy landscape}, series = {New J. Phys.}, volume = {21}, journal = {New J. Phys.}, doi = {10.1088/1367-2630/ab3765}, pages = {083027}, abstract = {A colloidal particle is driven across a temporally oscillating one-dimensional optical potential energy landscape and its particle motion is analysed. Different modes of dynamic mode locking are observed and are confirmed with the use of phase portraits. The effect of the oscillation frequency on the mode locked step width is addressed and the results are discussed in light of a high-frequency theory and compared to simulations. Furthermore, the influence of the coupling between the particle and the optical landscape on mode locking is probed by increasing the maximum depth of the optical landscape. Stronger coupling is seen to increase the width of mode locked steps. Finally, transport across the temporally oscillating landscape is studied by measuring the effective diffusion coefficient of a mobile particle, which is seen to be highly sensitive to the driving velocity and mode locking.}, language = {en} } @misc{AbboudGroetschelKoch, author = {Abboud, Nadine and Gr{\"o}tschel, Martin and Koch, Thorsten}, title = {Mathematical Methods for Physical Layout of Printed Circuit Boards: An Overview}, url = {http://nbn-resolving.de/urn:nbn:de:0297-zib-9231}, number = {06-29}, abstract = {This article surveys mathematical models and methods used for physical PCB layout, i.e., component placement and wire routing. The main concepts are briefly described together with relevant references.}, language = {en} } @article{AbboudGroetschelKoch2008, author = {Abboud, Nadine and Gr{\"o}tschel, Martin and Koch, Thorsten}, title = {Mathematical methods for physical layout of printed circuit boards: an overview}, series = {OR Spectrum}, volume = {30}, journal = {OR Spectrum}, number = {3}, doi = {10.1007/s00291-007-0080-9}, pages = {453 -- 468}, year = {2008}, language = {en} } @misc{AbdelHamidAscheuerGroetschel, author = {Abdel-Hamid, Atef Abdel-Aziz and Ascheuer, Norbert and Gr{\"o}tschel, Martin}, title = {Order Picking in an Automatic Warehouse: Solving Online Asymmetric TSPs}, url = {http://nbn-resolving.de/urn:nbn:de:0297-zib-3519}, number = {SC-98-08}, abstract = {We report on a joint project with industry that had the aim to sequence transportation requests within an automatic storage system in such a way that the overall travel time is minimized. The manufacturing environment is such that scheduling decisions have to be made before all jobs are known. We have modeled this task as an \emph{online} Asymmetric Traveling Salesman Problem (ATSP). Several heuristics for the online ATSP are compared computationally within a simulation environment to judge which should be used in practice. Compared to the priority rule used so far, the optimization package reduced the unloaded travel time by about 40~\\%. Because of these significant savings our procedure was implemented as part of the control software for the stacker cranes of the storage systems.}, language = {en} } @misc{AbdelHamidAscheuerGroetscheletal., author = {Abdel-Hamid, Atef Abdel-Aziz and Ascheuer, Norbert and Gr{\"o}tschel, Martin and Schorer, Herbert}, title = {Simulation und Optimierung einer PC-Fertigung unter Echtzeitbedingungen}, url = {http://nbn-resolving.de/urn:nbn:de:0297-zib-1700}, number = {SC-95-04}, abstract = {Die Business Unit PC in Augsburg ist die zentrale Produktionsst{\"a}tte der Siemens--Nixdorf Informationssysteme (SNI) AG f{\"u}r Personal Computer sowie f{\"u}r einige Periph{\"a}rger{\"a}te. Das Werk, entworfen nach modernen CIM/CAI--Konzepten (Computer Integrated Manufacturing/ Computer Aided Industry), wurde 1987 errichtet. Bald zeigte sich jedoch, daß es f{\"u}r ein zu geringes Produktionsvolumen ausgelegt war und einige Komponenten des Systems Engp{\"a}sse im Produktionsbetrieb darstellen. Das Management suchte nach M{\"o}glichkeiten, den Produktionsfluß zu verbessern, ohne teure technische {\"A}nderungen am System vornehmen zu m{\"u}ssen. Eine Forschungsgruppe des Konrad--Zuse--Zentrums f{\"u}r Informationstechnik (die ehemals an der Universit{\"a}t Augsburg ans{\"a}ssig war) analysierte, unterst{\"u}tzt von einigen Studenten und Ingenieuren der SNI, den Produktionsfluß und lokalisierte Schwachstellen. Basierend auf diesen Erkenntnissen wurden mathematische Fragestellungen erarbeitet und auf mathematischen Optimierungsverfahren basierende Softwarepakete entwickelt, die jetzt teilweise bei SNI im Einsatz sind. Im folgenden werden einige dieser Fragestellungen, deren Modellierung und mathematische Behandlung beschrieben. Einige der Ans{\"a}tze, die hier dargestellt werden sollen, sind teilweise schon in Gr{\"o}tschel [Gr{\"o}92] angesprochen worden.}, language = {de} } @inproceedings{AbdelHamidAscheuerGroetscheletal.1995, author = {Abdel-Hamid, Atef Abdel-Aziz and Ascheuer, Norbert and Gr{\"o}tschel, Martin and Schorer, Herbert}, title = {Simulation und Optimierung einer PC-Fertigung unter Echtzeitbedingungen}, series = {Mathematik in der Praxis. Fallstudien aus Industrie, Wirtschaft, Naturwissenschaften und Medizin}, booktitle = {Mathematik in der Praxis. Fallstudien aus Industrie, Wirtschaft, Naturwissenschaften und Medizin}, editor = {Bachem, Achim and J{\"u}nger, Michael and Schrader, Rainer}, publisher = {Springer}, pages = {261 -- 277}, year = {1995}, language = {en} } @misc{AbdelHamidBorndoerfer, author = {Abdel-Hamid, Atef Abdel-Aziz and Bornd{\"o}rfer, Ralf}, title = {On the Complexity of Storage Assignment Problems.}, url = {http://nbn-resolving.de/urn:nbn:de:0297-zib-1430}, number = {SC-94-14}, abstract = {{\def\NP{\hbox{\$\cal N\kern-.1667em\cal P\$}} The {\sl storage assignment problem} asks for the cost minimal assignment of containers with different sizes to storage locations with different capacities. Such problems arise, for instance, in the optimal control of automatic storage devices in flexible manufacturing systems. This problem is known to be \$\NP\$-hard in the strong sense. We show that the storage assignment problem is \$\NP\$-hard for {\sl bounded sizes and capacities}, even if the sizes have values \$1\$ and~\$2\$ and the capacities value~\$2\$ only, a case we encountered in practice. Moreover, we prove that no polynomial time \$\epsilon\$-approximation algorithm exists. This means that almost all storage assignment problems arising in practice are indeed hard.}}, language = {en} } @article{AbebeAbassGomardetal., author = {Abebe, Muluneh G. and Abass, Aimi and Gomard, Guillaume and Zschiedrich, Lin and Lemmer, Uli and Richards, Bryce S. and Rockstuhl, Carsten and Paetzold, Ulrich W.}, title = {Rigorous wave-optical treatment of photon recycling in thermodynamics of photovoltaics: Perovskite thin-film solar cells}, series = {Phys. Rev. B}, volume = {98}, journal = {Phys. Rev. B}, doi = {10.1103/PhysRevB.98.075141}, pages = {075141}, language = {en} } @inproceedings{AbebeGomardZschiedrichetal., author = {Abebe, Muluneh G. and Gomard, Guillaume and Zschiedrich, Lin and Rockstuhl, Carsten and Paetzold, Ulrich W. and Abass, Aimi}, title = {Thermodynamics of Photon Recycling in Four Terminal Perovskite/si Tandem Solar Cells}, series = {Optical Nanostructures and Advanced Materials for Photovoltaics}, booktitle = {Optical Nanostructures and Advanced Materials for Photovoltaics}, doi = {10.1364/PV.2017.PM4A.2}, pages = {PM4A.2}, language = {en} } @article{AbendrothBujotzekShanetal.2011, author = {Abendroth, Frank and Bujotzek, Alexander and Shan, Min and Haag, Rainer and Weber, Marcus and Seitz, Oliver}, title = {DNA-controlled bivalent presentation of ligands for the estrogen receptor}, series = {Angew. Chem. Int. Ed.}, journal = {Angew. Chem. Int. Ed.}, year = {2011}, language = {en} } @article{AbendrothSollederWelkeretal., author = {Abendroth, Frank and Solleder, Marthe and Welker, Pia and Licha, Kai and Weber, Marcus and Seitz, Oliver and Mangoldt, Dorothea}, title = {High affinity flourescence labelled ligands for the estrogen receptor}, series = {Eur. J. Org. Chem.}, volume = {2015}, journal = {Eur. J. Org. Chem.}, number = {10}, pages = {2157 -- 2166}, language = {en} } @article{AblyazimovAbuhozaAdaketal., author = {Ablyazimov, T. and Abuhoza, A. and Adak, R. P. and Reinefeld, Alexander and Schintke, Florian and et al.,}, title = {Challenges in QCD matter physics - The scientific programme of the Compressed Baryonic Matter experiment at FAIR}, series = {The European Physical Journal A}, journal = {The European Physical Journal A}, doi = {10.1140/epja/i2017-12248-y}, language = {en} } @misc{AboulhassanBaumWodoetal., author = {Aboulhassan, Amal and Baum, Daniel and Wodo, Olga and Ganapathysubramanian, Baskar and Amassian, Aram and Hadwiger, Markus}, title = {A Novel Framework for Visual Detection and Exploration of Performance Bottlenecks in Organic Photovoltaic Solar Cell Materials}, issn = {1438-0064}, url = {http://nbn-resolving.de/urn:nbn:de:0297-zib-54353}, abstract = {Current characterization methods of the so-called Bulk Heterojunction (BHJ), which is the main material of Organic Photovoltaic (OPV) solar cells, are limited to the analysis of global fabrication parameters. This reduces the efficiency of the BHJ design process, since it misses critical information about the local performance bottlenecks in the morphology of the material. In this paper, we propose a novel framework that fills this gap through visual characterization and exploration of local structure-performance correlations. We also propose a formula that correlates the structural features with the performance bottlenecks. Since research into BHJ materials is highly multidisciplinary, our framework enables a visual feedback strategy that allows scientists to build intuition about the best choices of fabrication parameters. We evaluate the usefulness of our proposed system by obtaining new BHJ characterizations. Furthermore, we show that our approach could substantially reduce the turnaround time.}, language = {en} } @article{AboulhassanBaumWodoetal., author = {Aboulhassan, Amal and Baum, Daniel and Wodo, Olga and Ganapathysubramanian, Baskar and Amassian, Aram and Hadwiger, Markus}, title = {A Novel Framework for Visual Detection and Exploration of Performance Bottlenecks in Organic Photovoltaic Solar Cell Materials}, series = {Computer Graphics Forum}, volume = {34}, journal = {Computer Graphics Forum}, number = {3}, publisher = {Wiley}, doi = {10.1111/cgf.12652}, pages = {401 -- 410}, abstract = {The current characterization methods of the Bulk Heterojunction (BHJ) - the main material of the new Organic Photovoltaic solar cells - are limited to the analysis of global fabrication parameters. This reduces the efficiency of the BHJ design process, since it misses critical information about the local performance bottlenecks in the morphology of the material. In this paper, we propose a novel framework that fills this gap through visual charac- terization and exploration of local structure-performance correlations. We propose a new formula that correlates the structural features to the performance bottlenecks. Since research into BHJ materials is highly multidisci- plinary, we enable a visual feedback strategy that allows the scientists to build intuition about the best choices of fabrication parameters. We evaluate the usefulness of our proposed system by obtaining new BHJ characteri- zations. We furthermore show that our approach could reduce the previous work-flow time from days to minutes.}, language = {en} } @misc{AboulhassanSicatBaumetal., author = {Aboulhassan, Amal and Sicat, Ronell and Baum, Daniel and Wodo, Olga and Hadwiger, Markus}, title = {Comparative Visual Analysis of Structure-Performance Relations in Complex Bulk-Heterojunction Morphologies}, issn = {1438-0064}, url = {http://nbn-resolving.de/urn:nbn:de:0297-zib-63239}, abstract = {The structure of Bulk-Heterojunction (BHJ) materials, the main component of organic photovoltaic solar cells, is very complex, and the relationship between structure and performance is still largely an open question. Overall, there is a wide spectrum of fabrication configurations resulting in different BHJ morphologies and correspondingly different performances. Current state- of-the-art methods for assessing the performance of BHJ morphologies are either based on global quantification of morphological features or simply on visual inspection of the morphology based on experimental imaging. This makes finding optimal BHJ structures very challenging. Moreover, finding the optimal fabrication parameters to get an optimal structure is still an open question. In this paper, we propose a visual analysis framework to help answer these questions through comparative visualization and parameter space exploration for local morphology features. With our approach, we enable scientists to explore multivariate correlations between local features and performance indicators of BHJ morphologies. Our framework is built on shape-based clustering of local cubical regions of the morphology that we call patches. This enables correlating the features of clusters with intuition-based performance indicators computed from geometrical and topological features of charge paths.}, language = {en} }