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作者： Allgeier, Stephan Anzlinger, Fabian Bohn, Sebastian Mikut, Ralf Neumann, Oliver Reichert, Klaus-Martin Stachs, Oliver Sperlich, Karsten Institute for Automation and Applied Informatics Karlsruhe Germany Rostock University Medical Center Department of Ophthalmology Rostock Germany

Laser-scanning confocal microscopy of the human cornea acquires in vivo images of corneal tissues with cellular resolution, which offers diagnostic potential for a variety of diseases. However, involuntary fixational eye movements induce motion artefacts that pose a challenge for accurate morphometric analysis and particularly for preceding image data fusion steps. Different image registration algorithms promise to eliminate such artefacts, but objective, quantitative evaluation of the registration results is difficult because of the lack of ground truth data. Simulation approaches offer a possibility to close this gap. Existing open-source software for the simulation of fixational eye movements is currently limited to creating drift movement. The present contribution proposes complementary models for microsaccade and tremor components to provide complete simulated fixational eye movement paths. In addition, it reports results from an extensive examination of different model parameter combinations. It is shown that the microsaccade model is capable of reproducing intermicrosaccade intervals that closely resemble experimental data. A software implementation is provided as open-source Python modules. © 2024 The Author(s), published by De Gruyter.

关键词： Image fusion

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The size of the friction coefficient of the sliding pair depending on the lubricant used

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Materials Science Forum 2018年 919卷 327-334页

作者： Labašová, Eva Labaš, Vladimír Slovak University of Technology Faculty of Materials Science and technology Institute of Applied Informatics Automation and Mechatronics Bottova 25 Slovakia Slovak University of Technology Faculty of Materials Science and technology Institute of Materials Science Bottova 25 Slovakia

Tribometry methods are focused on the research of tribological processes. These method also include model tests on experimental equipment, which operate in exactly-defined mode. Input parameters of tests are transparent and easy to maintain constant. Outputs variables, which are recorded, represent characteristic parameters of tribological processes. Tests are carried out on simple test samples. The aim of these methods is to numerically express the magnitude of friction force, friction moment, respectively determinate the friction coefficient. The contribution is focused on determining the friction coefficient for brass and steel test samples. The measurements were realized on a test machine Tribotestor M`89. Size of the sliding velocity and size of the loading force were entered to the tests as input parameters. Two types of oil were used in the experiments: Castrol Manual EP 80W and Madit PP90. The results obtained show that the friction coefficient value decreases with the increasing normal load for both materials and also for both lubricants. Smaller friction coefficient values were achieved using lubricant Castrol manual EP 80W for both materials. The average values of the friction coefficient under the load conditions ranged from 0.056 to 0.1240. © 2018 Trans Tech Publications, Switzerland.

关键词： Brass

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Determining of shear modulus for the samples circular and hollow circular cross-section

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Materials Science Forum 2016年 862卷 298-304页

作者： Labašová, Eva Ďuriš, Rastislav Labaš, Vladimír Slovak University of Technology Faculty of Materials Science and technology Institute of Applied Informatics Automation and Mechatronics Bottova 25 Slovakia Slovak University of Technology Faculty of Materials Science and technology Institute of Materials Science Bottova 25 Slovakia

The contribution is focused on estimating the shear modulus of the samples of circular and hollow circular sections by static method. The samples were loaded by simple torsion, individual sections were stressed by shear stress. Theoretical basis are determined by linear elasticity and strength theory and they define the relation between shear modulus, maximum shear stress and relative strains. Relative strains are determined by using measurement apparatus and measurement system Quantum X MX 840. © 2016 Trans Tech Publications, Switzerland.

关键词： Shear stress

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Detection of a Quasiperiodic Phenomenon of a Binary Star System Using Convolutional Neural Network

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Intelligent automation & Soft Computing 2023年第9期37卷 2519-2535页

作者： Denis Benka Sabína Vasová Michal Kebísek Maximilián Strémy Institute of Applied Informatics Automation and MechatronicsFaculty of Materials Science and TechnologySlovak University of TechnologyTrnava91724Slovakia

Pattern recognition algorithms are commonly utilized to discover certain patterns,particularly in image-based *** study focuses on quasiperiodic oscillations(QPO)in celestial objects referred to as cataclysmic variables(CV).We are dealing with interestingly indistinct QPO signals,which we analyze using a power density spectrum(PDS).The confidence in detecting the latter using certain statistical approaches may come out with less significance than the *** work with real and simulated QPO data of a CV called MV *** primary statistical tool for determining confidence levels is sigma *** aforementioned CV has scientifically proven QPO existence,but as indicated by our analysis,the QPO ended up falling below 1-σ,and such QPOs are not noteworthy based on the former *** intend to propose and ultimately train a convolutional neural network(CNN)using two types of QPO data with varying amounts of training dataset *** aim to demonstrate the accuracy and viability of the classification using a CNN in comparison to sigma *** resulting detection rate of our algorithm is very plausible,thus proving the effectiveness of CNNs in this scientific area.

关键词： Convolutional neural network quasi-periodic oscillation cataclysmic variable simulation

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Heuristics for Transmission Expansion Planning in Low-Carbon Energy System Models

Heuristics for Transmission Expansion Planning in Low-Carbon...

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International Conference on European Electricity Market, EEM

作者： Fabian Neumann Tom Brown Institute for Automation and Applied Informatics Karlsruhe Institute of Technology

Governments across the world are planning to increase the share of renewables in their energy systems. The siting of new wind and solar power plants requires close coordination with grid planning, and hence co-optimization of investment in generation and transmission expansion in spatially and temporally resolved models is an indispensable but complex problem. Particularly considerations of transmission expansion planning (TEP) add to the problem's complexity. Even if the power flow equations are linearized, the optimization problem is still bilinear and mixed-integer due to the dependence of line expansion on line impedance and a discrete set of line expansion options. While it is possible to linearize this mixed-integer nonlinear program (MINLP) by applying a big-M disjunctive relaxation, the resulting MILP is still hard to solve using state-of-the-art solvers for large-scale energy system models. In this paper we therefore develop heuristics to incorporate integer transmission expansion and responsive line impedances in energy system models, while retaining the lower computational effort of continuous linear programming (LP) by applying sequential linear programming (SLP) techniques, relaxation and discretization approaches. We benchmark their performance against the results of the exact formulation for a policy-relevant case study of the German transmission system in terms of their speed-up in computation time, deviation from optimal total system cost, and similarity of line expansion. Using heuristics we reduce computation times of joint generation and transmission optimisation by 82% with a maximal total system cost deviation of only 1.5%. The heuristics closely mirror optimal integer line investment of the exact MINLP with considerable time savings for policy-relevant low-carbon energy system optimization models.

关键词： Investment Optimization Planning Mathematical model Linear programming Computational modeling Generators

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Auction Design to use Flexibility Potentials in the Energy-Intensive Industry

Auction Design to use Flexibility Potentials in the Energy-I...

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International Conference on the European Energy Market

作者： Nicole Ludwig Ralf Mikut Veit Hagenmeyer Institute for Automation and Applied Informatics Karlsruhe Institute of Technology

In the present paper, we propose auction designs to use flexibility potentials in the energy intensive industry. More specifically, we investigate a large chemical industrial site, which consists of several small production facilities. Given data of the potential energy flexibility of these facilities, we analyse which auctions could be used to make the production managers change their operational decisions from a pure production schedule focus to a more energy usage based focus that supports an energy grid with high renewable energy penetration.

关键词： Auction Energy Systems Flexibility Industrial Processes

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Geometric Relationships in Constant Output Control

Geometric Relationships in Constant Output Control

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International Conference on Control, Decision and Information Technologies (CoDIT)

作者： Adam Kastner Lutz Gröll Veit Hagenmeyer Institute for Automation and Applied Informatics Karlsruhe Institute of Technology

ISBN: (数字)9798350373974

ISBN: (纸本)9798350373981

One of the most common and important tasks in control is to maintain a specified constant output value. While constant output is typically achieved for linear time-invariant systems by controlling a state equilibrium, it is also possible to achieve with nonequilibrium state trajectories. These include superpositions with the zero dynamics trajectories, as well as nonequilibrium non-zero-dynamics trajectories. We give a geometric description of the state subspace which allows a constant output. For a nondegenerate system with no invariant zero at s = 0, the subspace is the sum of the equilibrium subspace and the maximal output-nulling subspace. Furthermore, for minimal systems, a stronger statement in the form of a necessary and sufficient condition is given.

关键词： Sufficient conditions Control systems Trajectory Control theory Information technology

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Comparing human and algorithmic anomaly detection for HVAC systems applications 8

Comparing human and algorithmic anomaly detection for HVAC s...

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8th IEEE International Conference on Big Data Computing Service and Applications, BigDataService 2022

作者： Borrison, Reuben Syndicus, Marc Orth, Andre Markovic, Romana Dix, Marcel Liguori, Antonio Berning, Matthias Wagner, Andreas Van Treeck, Christoph Corporate Research ABB AG Ladenburg Germany RWTH Aachen University Energy Efficiency and Sustainable Building Aachen Germany Institute for Automation and Applied Informatics KIT Karlsruhe Institute of Technology Karlsruhe Germany Building Science Group fbta KIT Karlsruhe Institute of Technology Karlsruhe Germany Bauphysik und Technischer Ausbau KIT Karlsruhe Institute of Technology Karlsruhe Germany

ISBN: (数字)9781665458900

ISBN: (纸本)9781665458900

This paper reports the first results of a comparison of human and algorithmic anomaly detection. We are interested in how human and automated anomaly detection can be combined in the most beneficial way to improve how fault detection is practiced in building maintenance. Open source datasets with sensor data were annotated by persons with low subject matter experience, and compared with a Convolutional Autoencoder Neural Network (CAE) as well as a dedicated time series algorithm (DeepAnT), and detection metrics of human and algorithmic procedures are compared. Future comparisons will include higher levels of expertise on the human side, and more sophistication/training amount on the algorithm side. We close by discussing the advantages and caveats of our approach. © 2022 IEEE.

关键词： Anomaly detection

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Heuristics for Transmission Expansion Planning in Low-Carbon Energy System Models

arXiv

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arXiv 2019年

作者： Neumann, Fabian Brown, Tom Institute for Automation and Applied Informatics Karlsruhe Institute of Technology

Governments across the world are planning to increase the share of renewables in their energy systems. The siting of new wind and solar power plants requires close coordination with grid planning, and hence co-optimization of investment in generation and transmission expansion in spatially and temporally resolved models is an indispensable but complex problem. Particularly considerations of transmission expansion planning (TEP) add to the problem’s complexity. Even if the power flow equations are linearized, the optimization problem is still bilinear and mixed-integer due to the dependence of line expansion on line impedance and a discrete set of line expansion options. While it is possible to linearize this mixed-integer nonlinear program (MINLP) by applying a big-M disjunctive relaxation, the resulting MILP is still hard to solve using state-of-the-art solvers for large-scale energy system models. In this paper we therefore develop heuristics to incorporate integer transmission expansion and responsive line impedances in energy system models, while retaining the lower computational effort of continuous linear programming (LP) by applying sequential linear programming (SLP) techniques, relaxation and discretization approaches. We benchmark their performance against the results of the exact formulation for a policy-relevant case study of the German transmission system in terms of their speed-up in computation time, deviation from optimal total system cost, and similarity of line expansion. Using heuristics we reduce computation times of joint generation and transmission optimisation by 82% with a maximal total system cost deviation of only 1.5%. The heuristics closely mirror optimal integer line investment of the exact MINLP with considerable time savings for policy-relevant low-carbon energy system optimization models. Copyright © 2019, The Authors. All rights reserved.

关键词： Expansion

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The integration processes for the effective dataflow control and monitoring

The integration processes for the effective dataflow control...

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2012 International Conference on Computer Science and Service System, CSSS 2012

作者： Zobok, Maros Tanuska, Pavol Institute of Applied Informatics Automation and Mathematics Slovak University of Technology in Bratislava Trnava Slovakia

ISBN: (纸本)9780769547190

The article is focused on the main known data integration issues within the consolidating of the heterogeneous data systems. The aim is to propose the data flow processing structure which will increase the data control, improve the process logic and create the effective way to trace data import failures and discrepancies. The improved data flow processes will be implemented in the middleware import object structure layer placed between the data source and data destination. All together, it will ensure the data consistency of integrated data system. © 2012 IEEE.

关键词： Data integration

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