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Semi-automatic generation of tight binary masks and non-convex isosurfaces for quantitative analysis of 3D biological samples

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arXiv 2020年

作者： Bhide, Sourabh Mikut, Ralf Leptin, Maria Stegmaier, Johannes Director’s Research Unit European Molecular Biology Laboratory Heidelberg Germany Collaboration for joint PhD degree between EMBL and Heidelberg University Faculty of Biosciences Institute for Automation and Applied Informatics Karlsruhe Institute of Technology Karlsruhe Germany European Molecular Biology Organization Heidelberg Germany Institute of Imaging and Computer Vision RWTH Aachen University Aachen Germany

Current in vivo microscopy allows us detailed spatiotemporal imaging (3D+t) of complete organisms and offers insights into their development on the cellular level. Even though the imaging speed and quality is steadily improving, fully-automated segmentation and analysis methods are often not accurate enough. This is particularly true while imaging large samples (100 µm −1 mm) and deep inside the specimen. Drosophila embryogenesis, widely used as a developmental paradigm, presents an example for such a challenge, especially where cell outlines need to imaged a general challenge in other systems as well. To deal with the current bottleneck in analyzing quantitatively the 3D+t light-sheet microscopy images of Drosophila embryos, we developed a collection of semi-automatic open-source tools. The presented methods include a semi-automatic masking procedure, automatic projection of non-convex 3D isosurfaces to 2D representations as well as cell segmentation and tracking. Copyright © 2020, The Authors. All rights reserved.

关键词： Biology

How to Teach Control System Optimization (A Practical Decompisition Approach for the Optimization of TDOF Control Systems)

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IFAC-PapersOnLine 2019年第9期52卷 115-120页

作者： Cs. Bányász L. Keviczky R. Bars Institute for Computer Science and Control of the Hungarian Academy of Sciences Department of Automation and Applied Informatics Budapest University of Technology and Economics H-1111 Budapest Kende u 13-17 Hungary

The optimality in a generic two-degree of freedom control system can be decomposed into three major steps, because the control error has three major parts: design-, realizability- and modeling-loss. The second term can be made zero for inverse stable processes only. This decomposition opens new ways for practical optimization of two-degree-of-freedom ( TDOF ) systems and helps the construction of new algorithms for robust identification and control. It is more reasonable to teach the optimization of control systems using these components.

关键词： two-degree-of-freedom control systems performance robustness optimality

Distributed state estimation for ac power systems using gauss-Newton aladin

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arXiv 2019年

作者： Du, Xu Engelmann, Alexander Jiang, Yuning Faulwasser, Timm Houska, Boris School of Information Science and Technology ShanghaiTech University Shanghai China Institute for Automation and Applied Informatics Karlsruhe Institue of Technology Eggenstein-Leopoldshafen Germany

This paper proposes a structure exploiting algorithm for solving non-convex power system state estimation problems in distributed fashion. Because the power flow equations in large electrical grid networks are non-convex equality constraints, we develop a tailored state estimator based on Augmented Lagrangian Alternating Direction Inexact Newton (ALADIN) method, which can handle the nonlinearities efficiently. Here, our focus is on using Gauss-Newton Hessian approximations within ALADIN in order to arrive at at an efficient (computationally and communicationally) variant of ALADIN for network maximum likelihood estimation problems. Analyzing an IEEE 30-Bus system we illustrate how the proposed algorithm can be used to solve highly nontrivial network state estimation problems. We also compare the method with existing distributed parameter estimation codes in order to illustrate its performance. Copyright © 2019, The Authors. All rights reserved.

关键词： Constrained optimization

Decreasing market value of variable renewables can be avoided by policy action

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arXiv 2020年

作者： Brown, T. Reichenberg, L. Berlin10587 Germany Institute for Automation and Applied Informatics Karlsruhe Institute of Technology Hermann-von-Helmholtz-Platz 1 Eggenstein-Leopoldshafen76344 Germany Department of Space Earth and Environment Chalmers University of Technology Göteborg412 96 Sweden Department of Mathematics and Systems Analysis Aalto University Otakaari 1 FEspoo Finland

Although recent studies have shown that electricity systems with shares of wind and solar above 80% can be affordable, economists have raised concerns about market integration. Correlated generation from variable renewable sources depresses market prices, which can cause wind and solar to cannibalise their own revenues and prevent them from covering their costs from the market. This cannibalisation appears to set limits on the integration of wind and solar, and thus to contradict studies that show that high shares are cost effective. Here we show from theory and with simulation examples how market incentives interact with prices, revenue and costs for renewable electricity systems. The decline in average revenue seen in some recent literature is due to an implicit policy assumption that technologies are forced into the system, whether it be with subsidies or quotas. This decline is mathematically guaranteed regardless of whether the subsidised technology is variable or not. If instead the driving policy is a carbon dioxide cap or tax, wind and solar shares can rise without cannibalising their own market revenue, even at penetrations of wind and solar above 80%. The strong dependence of market value on the policy regime means that market value needs to be used with caution as a measure of market integration. Declining market value is not necessarily a sign of integration problems, but rather a result of policy choices. Copyright © 2020, The Authors. All rights reserved.

关键词： Carbon dioxide

On the application of the semismooth* Newton method to variational inequalities of the second kind

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arXiv 2020年

作者： Gfrerer, Helmut Outrata, Jiří V. Valdman, Jan Institute of Computational Mathematics Johannes Kepler University Linz LinzA-4040 Austria Institute of Information Theory and Automation Czech Academy of Sciences Prague18208 Czech Republic Centre for Informatics and Applied Optimization Federation University of Australia POB 663 BallaratVic3350 Australia Institute of Mathematics Faculty of Science University of South Bohemia České Budějovice37005 Czech Republic

The paper starts with a concise description of the recently developed semismooth* Newton method for the solution of general inclusions. This method is then applied to a class of variational inequalities of the second kind. As a result, one obtains an implementable algorithm exhibiting a local superlinear convergence. Thereafter we suggest several globally convergent hybrid algorithms in which one combines the semismooth* Newton method with selected splitting algorithms for the solution of monotone variational inequalities. Their efficiency is documented by extensive numerical *** Codes 65K10, 65K15, 90C33. Copyright © 2020, The Authors. All rights reserved.

关键词： Variational techniques

Imitation modeling of radiation of ultra short pulses by Horn antenna and evaluation of the energy efficiency of radiators on their basis

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Imitation modeling of radiation of ultra short pulses by Hor...

IEEE International Symposium on Electromagnetic Compatibility - EMC Europe

作者： A. S. Usychenko L. N. Sorokin A. A. Sasunkevich Yu. M. Kutsan Laboratory of Applied Informatics and Problems of Information Society St. Petersburg Institute for Informatics and Automation of the Russian Academy of Science (SPIIRAS) St. Petersburg Russia Federal budgetary military educational institution of higher education "Military space Academy named after A.F. Mozhaysky" of the Ministry of defense of the Russian Federation St. Petersburg Russia Joint Stock Company "Scientific Research Institute "Vector" St. Petersburg Russia

ISBN: (数字)9781728155791

ISBN: (纸本)9781728155807

Software has been developed for automating the process of modeling ultrashort pulse radiation by broadband horn antennas. The influence of the duration of unipolar and bipolar voltage pulses exciting the antennas on the energy efficiency of their radiation is studied. It has been established that for each radiating antenna, regardless of the shape of the excitation pulse, there is approximately the same duration for which the maximum energy is radiated into space. It is shown that for equal energies of voltage pulses exciting antennas, the energy efficiency of radiation of bipolar pulses is higher than that of unipolar pulses.

关键词： Shape Horn antennas Electromagnetic compatibility Energy efficiency Ultra wideband antennas Software Antenna radiation patterns

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

DESIGN OF THE STATE FEEDBACK-BASED FEED-FORWARD CONTROLLER ASYMPTOTICALLY STABILIZING THE OVERHEAD CRANE AT THE DESIRED END POSITION

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arXiv 2019年

作者： Vrabel, Robert Slovak University of Technology in Bratislava Faculty of Materials Science and Technology Institute of Applied Informatics Automation and Mechatronics Bottova 25 Trnava917 01 Slovakia

The problem of feed-forward control of overhead crane system is discussed. By combining the Kalman’s controllability theory and Hartman-Grobman theorem from dynamical system theory, a linear, continuous state feedback-based feed-forward controller that stabilizes the crane system at the desired end position of payload is designed. The efficacy of proposed controller is demonstrated by comparing the simulation experiment results for overhead crane with/without time-varying length of hoisting rope.34A34, 93D15, 93D20 Copyright © 2019, The Authors. All rights reserved.

关键词： Controllers

On Verification of Designed Energy Systems Using Distributed Co-Simulations

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On Verification of Designed Energy Systems Using Distributed...

International Workshop/Symposium on Distributed Simulation and Real-Time Applications (DS-RT)

作者： Anselm Erdmann Anna Marcellan Dominik Hering Michael Suriyah Carolin Ulbrich Martin Henke André Xhonneux Dirk Müller Rutger Schlatmann Veit Hagenmeyer Institute for Automation and Applied Informatics Karlsruhe Institute of Technology Karlsruhe Germany Institute of Combustion Technology German Aerospace Center Stuttgart Germany Institute of Energy and Climate Research Energy Systems Engineering (IEK-10) Forschungszentrum Jülich GmbH Jülich Germany Institute of Electric Energy Systems and High-Voltage Technology Karlsruhe Institute of Technology Karlsruhe Germany PVcomB Helmholtz-Zentrum Berlin für Materialien und Energie GmbH Berlin Germany

ISBN: (数字)9781728173436

ISBN: (纸本)9781728173443

An essential part of the energy systems design procedure is simulation, since it serves as a tool for verification of the respective design. It serves the verifying of a stable operation of developed energy systems infrastructure, before it comes to the realization. As energy systems integration becomes an important part in a low carbon energy scenario in the future, the cooperation of experts specialized in various domains crucial to single aspects of the energy system is indispensable. Cosimulation, yet, enables the modelling in the familiar environment of the experts, but requires a detailed coordination of the simulation interfaces between the specific expert models. Hence, standardized interfaces are crucial to the efficient use of expert knowledge in distributed co-simulations. Therefore, in the presented paper a workflow for the co-simulation development of energy systems simulations, which simplifies the coordination procedure significantly by standardizing the interfaces between the models and their simulations, is introduced. The approach is exemplarily applied to the energy system design of a district comprising electricity and heat in order to show its successful performance.

关键词： Adaptation models Tools Mathematical model System analysis and design Data models Standards