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检索条件"任意字段=Conference on Simulation-Driven Modeling and Optimization"

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Virtual prototyping of complex photonic components and integrated circuits for polymer-based integration platform 20

Virtual prototyping of complex photonic components and integ...

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conference on Smart Photonic and Optoelectronic Integrated Circuits XX

作者： Polatynski, A. de Felipe, D. Conradi, H. Kresse, M. Richter, A. Mingaleev, S. Sokolov, E. Kleinert, M. Zawadzki, C. Keil, N. VPIphoton GmbH Carnotstr 6 D-10587 Berlin Germany VPI Dev Ctr Ul Filimonova 15-50831 Minsk 220037 BELARUS VPIphoton Inc 1 Edgewater DrSuite 108 Norwood MA 02062 USA Fraunhofer Heinrich Hertz Inst Einsteinufer 37 D-10587 Berlin Germany

ISBN: (数字)9781510615588

ISBN: (纸本)9781510615588

Recent developments in versatile polymer-based technologies and hybrid integration processes offer a flexible and cost-efficient alternative for creating very complex photonic components and integrated circuits. The fast and efficient test, optimization and verification of new ideas requires an automated and reproducible simulation and design process supporting flexible layout-driven and layout-aware schematic-driven methodologies. When considering very complex designs, even small fabrication tolerances of one building block could make a huge difference on the performance and manufacturability of the whole structure. To reduce risk of failure and to make performance predictions by virtual prototyping reliable, the simulation model of each single building block needs to be working correctly based not only on the appropriate mathematical and physical equations, but also on adequate information provided by the foundry where the final structure will be manufactured. The PolyPhotonics Berlin consortium targets to address these design challenges and establish a new versatile integration platform combining polymer with Indium-Phosphide and thin-film filter based technologies for numerous photonics applications in the global communications and sensing market. In this paper we will present our methodologies for modeling and prototyping optical elements including hybrid coupling techniques, and compare them with characterization data obtained from measurements of fabricated devices and test structures. We will demonstrate how the seamless integration between photonic circuit and foundry knowledge enable the rapid virtual prototyping of complex photonic components and integrated circuits.

关键词： Photonic components integrated optics polymer-based integration platform polymer waveguides Process Design Kit simulation design

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Grid-adaptation and convergence-verification in large eddy simulation: A robust and systematic approach 48th

Grid-adaptation and convergence-verification in large eddy s...

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48th AIAA Fluid Dynamics conference, 2018

作者： Toosi, Siavash Larsson, Johan Department of Mechanical Engineering University of Maryland College ParkMD20742 United States

ISBN: (数字)9781624105531

ISBN: (纸本)9781624105531

The purpose of the present study is to introduce an algorithm that enables robust convergence-verification and efficient grid-adaptation in large eddy simulation (LES). In this context, two main factors set LES apart from laminar or RANS simulations: (a) the grid affects both numerical and modeling errors in LES, and there is no mathematically provable and thus absolutely accurate way to estimate the effect of the latter;and (b) the chaotic nature makes ad-joints either ill-posed or very expensive to compute, for statistically stationary problems. These differences imply that the established methods for RANS (most notably, the adjoint-weighted residual method) do not directly translate to LES, which creates the need for a new LES-specific approach. This paper tackles this problem by taking a convergence-driven approach to the problem, and introducing a new technique for estimating the sources of error based on solutions from two different grids. The paper also introduces a modified principle for equi-distribution of the error sources, along with arguments that the traditional approach to equi-distribution is actually not a solution to the correct optimization problem. Finally, we test the performance of the proposed algorithm on grid-adaptation and convergence-verification of the problem of flow over a backward-facing step. © 2018, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Large eddy simulation

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modeling AND simulation FOR THE JOINT MAINTENANCE-INVENTORY optimization OF PRODUCTION SYSTEMS 18

MODELING AND SIMULATION FOR THE JOINT MAINTENANCE-INVENTORY ...

引用

Winter simulation conference (WSC)

作者： Zahedi-Hosseini, Farhad Univ Salford Manchester M5 4WT Lancs England

ISBN: (纸本)9781538665725

simulation methodologies are developed to model the joint optimization of preventive maintenance and spare part inventory for a specific industrial plant under different production configurations. First, spare part provision for a single-line system is considered, with the assumption that the demand is driven by maintenance requirements. The results indicate that a periodic review policy with replenishment as frequent as inspection is cost-optimal. Second, the joint optimization model for a multi-line (parallel) system is developed. It is found that a just-in-time review policy with inspection as frequent as replenishment produces the lowest cost policy. In this latter case, an implication of the proposed methodology is that, where mathematical modeling is intractable, or the use of certain assumptions make them impractical, simulation modeling is an appropriate solution tool. Under both production settings, the long-run average cost per unit time is used as the optimality criterion for the comparison of several policies.

关键词： Maintenance engineering Inspection optimization Mathematical model Analytical models Production Tools

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Capacity Demand based Multiobjective Optimal Small Cell Placement under Realistic Deployment Scenario

Capacity Demand based Multiobjective Optimal Small Cell Plac...

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AFRICON conference

作者： Ashagrie Getnet Flattie Beneyam B. Haile Dereje Hailemariam Edward Mutafungwa Jyri Hämäläinen Addis Ababa Institute of Technology Addis Ababa University Ethiopia Aalto University School of Electrical Engineering Finland

ISBN: (数字)9781728132891

ISBN: (纸本)9781728132907

To address operator's capacity challenges, efficient demand driven deployment of 4G and 5G small cells considering multiple targets of the operator is very important. To that end, multiobjective optimized small cell planning methodology has recently been proposed. Yet, the method does not provide straightforward mechanism to consider operator's spatial capacity demand that can be obtained from operator's existing network capacity and data market targets. In this work, we present a capacity demand based multiobjective optimal small cell placement method and its performance analysis for exemplary service area of Addis Ababa. To formulate spatial capacity demand, we use spatial user and traffic distribution data from network management system of existing network. As an input for Matlab based network simulation multiobjective optimization, propagation is computed using deterministic ray tracing model over 3D building and terrain map of the service area. The multiobjective optimization is performed for network capacity and cost objectives in this work using a Genetic Algorithm. Results show that the multiobjective placement method presents optimal small cell topologies that meet operator's spatial capacity demand while optimizing aggregate network capacity and cost. The optimization reduced 185-network topology to 45-130 optimal network topologies while significantly improving network capacity. The capacity improvement shows significant user throughput improvement effect. For instance, the 130-topology provides 57% gain in 90%-ile user throughput compared to the not optimized 185-topology.

关键词： optimization Throughput Interference Signal to noise ratio Network topology Computational modeling Topology

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A ros driven platform for radiomap management optimization in fingerprinting based indoor positioning 10th

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10th KES International conference on Intelligent Interactive Multimedia Systems and Services, IIMSS 2017

作者： Dierna, Giovanni Luca Machì, Alberto Scirè, Sergio Via Ugo La Malfa 153 Palermo Italy

ISBN: (纸本)9783319594798

An electromagnetic beacons infrastructure is commonly used in positioning applications within buildings where the GPS signal is not present. Through techniques of multilateration and fingerprinting an average accuracy of about 2 m can be reached, but the accuracy is limited by multiple reflections, obstacles and signal dispersion that make it unreliable analytic field modeling. Dense field sampling field allows a reconstruction more detailed but is costly and clever uneven sampling is appropriate. This work describes the progress of an interactive robotic platform under development to support field modeling and beacons positioning, through intelligent iterative strategies of data acquisition. The platform integrates a Matlab-based control system and simulation software: a robot equipped with distance sensors, able to perform autonomous navigation in a known environment, and a data logger module hosted in an Android mobile device, all connected via a ROS framework. Robot assisted field sampling is here proposed and used to reduce costs of radiomap construction and update. In particular, this technology is suitable for complex environments as museums and exhibitions. © Springer International Publishing AG 2018.

关键词： Mobile robots

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Journal of Physics: conference Series

Journal of Physics: Conference Series

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7th Science of Making Torque from Wind, TORQUE 2018

The proceedings contain 242 papers. The topics discussed include: impact of resin uptake of core materials on buckling of wind turbine blades;structural design of a multi-megawatt wind turbine blade with ONE SHOT BLADE® technology;preliminary design and optimization of a 20mw reference wind turbine;actuator line method simulations for the analysis of wind turbine wakes acting on helicopters;a Bayesian approach for predicting wind turbine failures based on meteorological conditions;aerodynamic analysis of Ampyx's airborne wind energy system;noise emission from wind turbines in wake - measurement and modeling;an integrated numerical method for wind turbine flow simulation, sound generation and propagation;blunt-wavy combined trailing edge for wind turbine blade inboard performance improvement;aerodynamic effects of compressibility for wind turbines at high tip speeds;data-driven machine learning for wind plant flow modeling;influence of ground roughness on the wake of a yawed wind turbine - a comparison of wind-tunnel measurements and model predictions;annual impact of wind-farm gravity waves on the Belgian-Dutch offshore wind-farm cluster;experimental investigation of soft kite performance during turning maneuvers;and evaluation of low cost vibration based damage detection systems.

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Journal of Physics: conference Series

Journal of Physics: Conference Series

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7th Science of Making Torque from Wind, TORQUE 2018

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Journal of Physics: conference Series

Journal of Physics: Conference Series

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7th Science of Making Torque from Wind, TORQUE 2018

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Journal of Physics: conference Series

Journal of Physics: Conference Series

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7th Science of Making Torque from Wind, TORQUE 2018

The proceedings contain 242 papers. The topics discussed include: impact of resin uptake of core materials on buckling of wind turbine blades;structural design of a multi-megawatt wind turbine blade with ONE SHOT BLADE® technology;preliminary design and optimization of a 20mw reference wind turbine;actuator line method simulations for the analysis of wind turbine wakes acting on helicopters;a Bayesian approach for predicting wind turbine failures based on meteorological conditions;aerodynamic analysis of Ampyx's airborne wind energy system;noise emission from wind turbines in wake - measurement and modeling;an integrated numerical method for wind turbine flow simulation, sound generation and propagation;blunt-wavy combined trailing edge for wind turbine blade inboard performance improvement;aerodynamic effects of compressibility for wind turbines at high tip speeds;data-driven machine learning for wind plant flow modeling;influence of ground roughness on the wake of a yawed wind turbine - a comparison of wind-tunnel measurements and model predictions;annual impact of wind-farm gravity waves on the Belgian Dutch offshore wind-farm cluster;experimental investigation of soft kite performance during turning maneuvers;and evaluation of low cost vibration based damage detection systems.

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Journal of Physics: conference Series

Journal of Physics: Conference Series

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7th Science of Making Torque from Wind, TORQUE 2018

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