Browsing by Subject "Optimization"

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  • Adaptation of Deeplab V3+ for Damage Detection on Port Infrastructure Imagery 
    Scherff, M.; Hake, F.; Alkhatib, H. (Katlenburg-Lindau : Copernicus Publications, 2023)
    Regular inspection and maintenance of infrastructure facilities are crucial to ensure their functionality and safety for users. However, current inspection methods are labor-intensive and can vary depending on the inspector. ...
  • Analysis of local Al-doped back surface fields for high efficiency screen-printed solar cells 
    Gatz, Sebastian; Bothe, Karsten; Müller, Jens; Dullweber, Thorsten; Brendel, Rolf (Amsterdam : Elsevier BV, 2011)
    In this paper, we investigate the surface recombination of local screen-printed aluminum contacts applied to rear passivated solar cells. We measure the surface recombination velocity by microwave-detected photoconductance ...
  • Antenna Array Pattern Synthesis via Coordinate Descent Method 
    Wang, Yuanhao; He, Xiaoxi; Wang, Jiangning; Berezin, Sergey; Mathis, Wolfgang (Delaware : Scientific Research Publishing Inc., 2015)
    This paper presents an array pattern synthesis algorithm for arbitrary arrays based on coordinate descent method (CDM). With this algorithm, the complex element weights are found to minimize a weighted L2 norm of the ...
  • Approach for Increasing the Resource Efficiency for the Production Process of Titanium Structural Components 
    Denkena, Berend; Jacob, Stefan (Amsterdam : Elsevier, 2015)
    Titanium structural components for the aircraft industry are usually manufactured from ingots of primary material. The process chain for the fabrication of these components consists of the production of titanium sponge, ...
  • Areal rainfall estimation using moving cars as rain gauges - A modelling study 
    Haberlandt, Uwe; Sester, Monika (Göttingen : Copernicus GmbH, 2010)
    Optimal spatial assessment of short-time step precipitation for hydrological modelling is still an important research question considering the poor observation networks for high time resolution data. The main objective of ...
  • Automated process planning in milling of hybrid components 
    Denkena, Berend; Wichmann, Marcel; Heide, Klaas Maximilian; Wiesener, Frederik; Nguyen, Hai Nam (Berlin, Heidelberg : Springer, 2023)
    Hybrid material composites can meet the increasing demands for high strength and low weight due to their different workpiece properties. Usually, hybrid components require post-machining after their fabrication. Due to the ...
  • Branching Exponents of Synthetic Vascular Trees under Different Optimality Principles 
    Jessen, Etienne; Steinbach, Marc C.; Debbaut, Charlotte; Schillinger, Dominik (New York, NY : IEEE, 2023)
    Objective: The branching behavior of vascular trees is often characterized using Murray's law. We investigate its validity using synthetic vascular trees generated under global optimization criteria. Methods: Our synthetic ...
  • Channel impulse response length and noise variance estimation for OFDM systems with adaptive guard interval 
    Nguyen, Van Duc; Kuchenbecker, Hans-Peter; Haas, Harald; Kyamakya, Kyandoghere; Gelle, Guillaume (Heidelberg : Springer Verlag, 2007)
    A new algorithm estimating channel impulse response (CIR) length and noise variance for orthogonal frequency-division multiplexing (OFDM) systems with adaptive guard interval (GI) length is proposed. To estimate the CIR ...
  • Computational optimization of gas compressor stations: MINLP models versus continuous reformulations 
    Rose, Daniel; Schmidt, Martin; Steinbach, Marc C.; Willert, Bernhard M. (Heidelberg : Springer Verlag, 2016)
    When considering cost-optimal operation of gas transport networks, compressor stations play the most important role. Proper modeling of these stations leads to nonconvex mixed-integer nonlinear optimization problems. In ...
  • A contact detection algorithm for superellipsoids based on the common-normal concept 
    Wellmann, Christian; Lillie, Claudia; Wriggers, Peter (Bingley : Emerald Group Publishing Ltd., 2008)
    Purpose - The paper aims to introduce an efficient contact detection algorithm for smooth convex particles. Design/methodology/approach - The contact points of adjacent particles are defined according to the common-normal ...
  • Contributions of information systems research to decision support for wind market players 
    Piel, Jan-Hendrik (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2022)
    The mitigation of climate change through the transition toward sustainable and efficient energy systems based on renewable energy technologies is one of the greatest challenges of the 21st century pursued by an ever-growing ...
  • Design of an one-sided transverse flux induction coil by using a numerical optimization algorithm 
    Schulze, M.; Nikanorov, A.; Nacke, B. (Bristol : Institute of Physics Publishing, 2018)
    The transverse flux heating (TFH) concept offers very high electrical efficiency in combination with unique technological flexibility. Numerous advantages make this method beyond competition to be applied in e.g. continuous ...
  • Discrete optimization for optical flow 
    Menze, Moritz; Heipke, Christian; Geiger, Andreas (Heidelberg : Springer Verlag, 2015)
    We propose to look at large-displacement optical flow from a discrete point of view. Motivated by the observation that sub-pixel accuracy is easily obtained given pixel-accurate optical flow, we conjecture that computing ...
  • Edges as nodes - A new approach to timetable information 
    Beyersdorff, Olaf; Nebesov, Yevgen (Wadern : Schloss Dagstuhl - Leibniz-Zentrum fuer Informatik GmbH, 2009)
    In this paper we suggest a new approach to timetable information by introducing the "edge-converted graph" of a timetable. Using this model we present simple algorithms that solve the earliest arrival problem (EAP) and the ...
  • Effect of modulation-doping on luminescence properties of plasma assisted MBE-grown GaN/AIGaN quantum well 
    Kamata, N.; Klausing, H.; Fedler, F.; Mistele, D.; Aderhold, J.; Semchinova, O.K.; Graul, J.; Someya, T.; Arakawa, Y. (Cambridge : Cambridge University Press, 2004)
    In order to improve the crystal quality of GaN-based light emitting devices, photoluminescence (PL) characterization of below-gap states in plasma assisted MBE-grown GaN/AlGaN quantum well (QW) structures has been done by ...
  • An efficient optimization approach for designing machine learning models based on genetic algorithm 
    Hamdia, Khader M.; Zhuang, Xiaoying; Rabczuk, Timon (London : Springer, 2021)
    Machine learning (ML) methods have shown powerful performance in different application. Nonetheless, designing ML models remains a challenge and requires further research as most procedures adopt a trial and error strategy. ...
  • Energy Demand Prediction in Hybrid Electrical Vehicles for Speed Optimization 
    Fink, Daniel; Shugar, Sean; Ziaukas, Zygimantas; Schweers, Christoph; Trabelsi, Ahmed; Jacob, Hans-Georg (Setúbal : SciTePress - Science and Technology Publications, Lda., 2022)
    Targeting a resource-efficient automotive traffic, modern driver assistance systems include speed optimization algorithms to minimize the vehicle’s energy demand, based on predictive route data. Within these algorithms, ...
  • Energy flow in jerk-decoupled translatory feed axes 
    Denkena, Berend; Möhring, H.-C.; Hesse, P. (London : SAGE Publications Ltd., 2007)
    This paper describes the energy flow in jerk-decoupled translatory feed axes. After an introductory survey on jerk-decoupled feed axes, a system simulation is presented. This system simulation includes a model of the ...
  • Extraction of fluvial networks in lidar data using marked point processes 
    Schmidt, Alena; Rottensteiner, Franz; Sörgel, Uwe; Heipke, Christian (Göttingen : Copernicus GmbH, 2014)
    We propose a method for the automatic extraction of fluvial networks in lidar data with the aim to obtain a connected network represented by the fluvial channels' skeleton. For that purpose we develop a two-step approach. ...
  • Finite element modeling of compression behavior of extruded polystyrene foam using X-ray tomography 
    Sadek, E.; Fouad, N.A. (London : SAGE Publications Ltd., 2013)
    Extruded polystyrene rigid foams have attracted a great attention as a superior load-bearing thermal insulation material since their implementation in building construction. One of the most common application areas of this ...