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Inexact matrix exponential preconditioner for implicitly restarted Arnoldi method in fluid dynamics stability problems for parallel heterogeneous architecture 7

Inexact matrix exponential preconditioner for implicitly res...

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7th International Conference on Mathematical Modeling in Physical Sciences, IC-MSQUARE 2018

作者： Evstigneev, Nikolay M. Federal Research Center Informatics and Control Institute for System Analysis Russian Academy of Science pr. 60-letiya Oktyabrya 9 Moscow117312 Russia

We wish to solve the problem of linear stability analysis of stationary solutions for a fluid dynamics problem governed by 3D Navier Stokes equations. The discrete problem is of order O(106) - O(107) so we use parallel computations to perform linear analysis. We aim at the heterogeneous computational architecture based on central (CPU) and graphical (GPU) processing units. In the paper we use the implicitly restarted Arnoldi method (IRAM) to recover the most dangerous eigenvalues. The IRAM has poor convergence without specific transformation of the matrix spectrum. Standard methods require either long computations or inverse of the transformed matrix. This can be troublesome in fluid dynamics problems where matrix is not available explicitly and is non-symmetric, ill-conditioned and can be fully filled. We propose the usage of the inexact matrix exponential with shift-inverse transformation using only matrix-vector product. The inverse is performed using Krylov methods using only matrix-vector product. We prove convergence bounds for the GMRES method and show that this type of matrix transformation accelerates GMRES convergence. We demonstrate application of the method in recovering eigenvalues close to the imaginary axis in some model problems on some matrices from the Matrix Market. We also demonstrate the application of the method for some fluid dynamics problems. We demonstrate convergence, acceleration and efficiency on the multiple GPU cluster. © 2018 Institute of Physics Publishing. All rights reserved.

关键词： Inverse problems

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Feature Selection for EEG Data Based on Logistic Regression 15

Feature Selection for EEG Data Based on Logistic Regression

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15th International Scientific-Technical Conference on Actual Problems of Electronic Instrument Engineering, APEIE 2021

作者： Timofeeva, Anastasiia Yu. Murtazina, Marina S. Novosibirsk State Technical University Theoretical and Applied Informatics Department Novosibirsk Russia Novosibirsk State Technical University Automated Control System Department Novosibirsk Russia

ISBN: (纸本)9781665434089

The article examines the application of dimensionality reduction methods based on logistic regression, such as stepwise selection and LASSO, when solving the problem of feature selection by which states of rest and increased cognitive load can be identified based on EEG data. The data set 'EEG During Mental Arithmetic Tasks' was used for the experiment. To form a matrix of features from EEG records presented in EDF format, features in the time and frequency domains were extracted using the Python library eeglib. During the experiment, the quality of the subsets of features selected by various methods was evaluated, and an analysis was carried out for all possible pairs of features. This made it possible to recommend certain techniques for analyzing EEG data in order to select a set of features that would best classify the level of cognitive load. The study showed that stepwise selection and an iterative procedure that eliminates the correlation of input variables select subset of features that provide 90% classification accuracy. While the regularization methods (LASSO and its modification Bolasso-S) give the worst results. In addition, it is recommended to supplement the analysis with an evaluation of the internal validity of the classification. © 2021 IEEE.

关键词： Feature Selection

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Identifying RNA-binding proteins using multi-label deep learning

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Science China(Information Sciences) 2019年第1期62卷 217-219页

作者： Xiaoyong PAN Yong-Xian FAN Jue JIA Hong-Bin SHEN Department of Medical Informatics Erasmus MC Guangxi Key Laboratory of Trusted Software Guilin University of Electronic Technology Affiliated Hospital of Jiangsu University Department of Automation Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Ministry of Education of China

Dear editor,RNA-binding proteins (RBPs) are involved in both transcriptional and post-transcriptional gene regulation, such as RNA splicing and localization. In addition, their dysregulations are closely associated with many diseases [1]. For example, mutations in the RBPs FUS and TDP-43that can cause amyotrophic lateral sclerosis [2].

关键词： RBP RNA Identifying RNA-binding proteins using multi-label deep learning

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Neural network aided reference voltage adaptation for NAND flash memory 12

Neural network aided reference voltage adaptation for NAND f...

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12th IEEE International Conference on Consumer Electronics, ICCE-Berlin 2022

作者： Bailon, Daniel Nicolas Taburet, Guillaume Shavgulidze, Sergo Freudenberger, Jurgen HTWG Konstanz University of Applied Sciences Institute for System Dynamics Germany ENSICAEN Engineering School France Georgian Technical University Faculty of Informatics and Control Systems Georgia

ISBN: (数字)9781665456760

ISBN: (纸本)9781665456760

Large persistent memory is crucial for many applications in embedded systems and automotive computing like AI databases, ADAS, and cutting-edge infotainment systems. Such applications require reliable NAND flash memories made for harsh automotive conditions. However, due to high memory densities and production tolerances, the error probability of NAND flash memories has risen. As the number of program/erase cycles and the data retention times increase, non-volatile NAND flash memories' performance and dependability suffer. The read reference voltages of the flash cells vary due to these aging processes. In this work, we consider the issue of reference voltage adaption. The considered estimation procedure uses shallow neural networks to estimate the read reference voltages for different life-cycle conditions with the help of histogram measurements. We demonstrate that the training data for the neural networks can be enhanced by using shifted histograms, i.e., a training of the neural networks is possible based on a few measurements of some extreme points used as training data. The trained neural networks generalize well for other life-cycle conditions. © 2022 IEEE.

关键词： Life cycle

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Development of 3D image measurement system and stereo-matching method, and its archeological measurement

IEEJ Transactions on Electronics, Information and Systems

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IEEJ Transactions on Electronics, Information and systems 2012年第3期132卷 391-400+8页

作者： Kochi, Nobuo Ito, Tadayuki Kitamura, Kazuo Kaneko, Syun'Ichi Imaging and Measuring Laboratory RandD Center Topcon Corporation 75-1 Hasunuma-cho Itabashi-ku Tokyo 174-8580 Japan System Sensing and Control Laboratory Division of System Science and Informatics Graduate School of Information Science and Technology Kita 14 Nishi 9 Kita-ku Sapporo Hokkaido 060-0814 Japan

The three dimensional measurement & modeling system with digital cameras on PC is now making progress and its need and hope is increasingly felt in terrestrial (close-range) photogrammetry for such sectors as cultural heritage preservation, architecture, civil engineering, manufacturing, measurement etc. Therefore, we have developed a system to improve the accuracy of stereo-matching, which is the very core of 3D measurement. As for stereo-matching method, in order to minimize the mismatching and to be robust in geometric distortions, occlusion, as well as brightness change, we invented Coarse-to-Fine Strategy Method by integrating OCM (Orientation Code Matching) with LSM (Least Squares Matching). Thus this system could attain the accuracy of 0.26mm, when we experimented on a mannequin. And when we actually experimented on the archeological ruins in Greece and Turkey, the accuracy was within the range of 1cm, compared with their blue-print plan. Besides, formally workers used to take at least 1.5 month for this kind of survey operation with the existing method, but now workers need only 3 or 4 days. Thus, its practicality and efficiency was confirmed. This paper demonstrates our new system of 3D measurement and stereo-matching with some concrete examples as its practical application. © 2012 The Institute of Electrical Engineers of Japan.

关键词： Least squares approximations

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Human body measurement by robust stereo-matching

IEEJ Transactions on Electronics, Information and Systems

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IEEJ Transactions on Electronics, Information and systems 2010年第6期130卷 1010-1016+16页

作者： Kitamura, Kazuo Kochi, Nobuo Watanabe, Hiroto Yamada, Mitsuharu Kaneko, Shun'ichi Imaging and Measuring Laboratory RandD Center Topcon Corporation 75-1 Hasunuma-cho Itabashi-ku Tokyo 174-8580 Japan System Sensing and Control Laboratory Division of System Science and Informatics Graduate School of Information Science and Technology Kita 14 Nishi 9 Kita-ku Sapporo 060-0814 Japan

We have developed a digital photogrammetry system, which enables us to make all-around 3D measurement using the object pictures obtained through the integrated works of digital cameras, projectors and our specific PC software. The system consists of units, each of which is again consists of two synchronized digital cameras and projectors with PC program. The measuring process is now simplified by making all the operations of orientation and measurement analysis automatic;and this, with a single push of a button. Automation of orientation was realized by creating a calibration box covered by color-coded targets, which enables us to make exterior orientation parameters of the cameras automatically. For stereo-matching, in order to minimize the mismatching, we invented Coarse-to Fine Strategy Method by integrating OCM (Orientation Code Matching) or robust matching with LSM (Least Square Matching). Therefore, improving the accuracy of the initial values of OCM, using LSM for fine measurement and making the involved operations automatic, we enhanced the quality of surface measurement and succeeded to shorten the measuring time considerably. In this paper we are presenting the report on our system of human body measurement and its processing method of stereo -matching, as well as on the result of comparing assessment of each matching method. © 2010 The Institute of Electrical Engineers of Japan.

关键词： Digital cameras

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Non-intrusive measurement of impulsive noise in telephone-type networks 14

Non-intrusive measurement of impulsive noise in telephone-ty...

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IEEE Instrumentation and Measurement Technology Conference - Sensing, Processing, Networking (IMTC/97)

作者： Bertocco, M Paglierani, P Padova University Dept. Electronics and Informatics Via Gradenigo 6/a Padova 35131 Italy Necsy Network Control System S.p.A. Via Lisbona 28 Padova 35020 Italy

ISBN: (纸本)0780337484

An in-service, non-intrusive technique for the characterization of stationary and impulsive noise in telecommunication system is presented. It is based on the segmentation of the signal observed during a telephone call in speech and noise periods by means of a bayesian classifier. The signal observed during noise periods is further processed by means of a hypothesis testing procedure in order to detect noise-impulses. Experimental results that show the effectiveness of the proposed technique are shown and discussed.

关键词： Telephone systems

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ADVANCED CONCEPTS IN POWER control systemS

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IFAC Proceedings Volumes 2007年第8期40卷 15-19页

作者： Ioan Dumitrache Sergiu Stelian Iliescu Automatic Control and System Engineering Department Automatic Control and Industrial Informatics Departament Faculty Automatic of Control and Computers Politehnica University of Bucharest

In this paper are presented some new concepts of control applied in Power systems. Are given the architectures and methodologies based on the agents theory. The complexity of Power systems is included into a new paradigm – Complex Adaptive systems – and the modelling and control of Power systems based on intelligent agents are considered. Some concepts on hierarchical and heterarchical architectures which include different intelligent techniques are also presented in this paper.

关键词： Eelectrical Ppower systems (EPS) Multi-Agent systems (MAS) Complex Adaptive systems (CAS)

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SHIP MONITORING AND control

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IFAC Proceedings Volumes 2007年第17期40卷 153-156页

作者： Antonio Tiano Zoran Lajic Antonio Zirilli Department of Informatics and Systems - University of Pavia ITALY Honeywell Control System Advanced Control Division Ringwood Southampton UK

This paper discusses the applicability of monitoring systems for improving ship control. After introducing some critical issues in the area of ship motion control an analysis is presented concerning the choice of different architecture and algorithms with particular reference to the applicability of new methods capable to implement robustness and adaptivity features and to the software requirements for building up advanced ship monitoring and control systems. An examples of ship monitoring and control system actually under development at the Department of Information and systems of the University of Pavia are presented

关键词： Ship control soft sensing uncertain dynamic systems estimation algorithms

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Weight hierarchies of linear codes satisfying the almost chain condition

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Science in China(Series F) 2003年第3期46卷 175-186页

作者：陈文德 TorleivKlφve Laboratory of Systems and Control Information Security CenterInstitute of Systems ScienceAcademy of Mathematics and System SciencesChinese Academy of SciencesBeijing 100080China Department of Informatics University of Bergen Bergen High Techology Center N-5020 Bergen Norway

The weight hierarchy of a linear [n, k;q] code C over GF(q) is the sequence (d1,d2,..., dk) where dr is the size of the smallest support of an r-dimensional subcode of C. An [n,k;q] code satisfies the chain condition if there exists subcodes D1 D2 … Dk = C of C such that Dr has dimension r and support of size dr for all r. Further, C satisfies the almost chain condition if it does not satisfy the chain condition, but there exist subcodes Dr of dimension r and support of size dr for all r such that D2 D3 Dk = C and D1 D3. A simple necessary condition for a sequence to be the weight hierarchy of a code satisfying the almost chain condition is given. Further, explicit constructions of such codes are given, showing that in almost all cases, the necessary conditions are also sufficient.

关键词： weight hierarchy linear code almost chain condition.

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