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Observer-based iterative learning control design in the repetitive process setting

IFAC-PapersOnLine 2017年第1期50卷 13390-13395页

作者： Paszke, Wojciech Rogers, Eric Patan, Krzysztof Institute of Control and Computation Engineering University of Zielona Góra ul. Szafrana 2 Zielona Góra65-516 Poland Department of Electronics and Computer Science University of Southampton SouthamptonSO17 1BJ United Kingdom

This paper considers the design of an observer-based iterative learning control law for discrete linear systems using repetitive process stability theory The resulting design produces a stabilizing feedback controller in the time domain and a PD-type of feedforward controller that guarantees monotonic convergence in the trial-to-trial domain. Furthermore, the new design procedure includes limited frequency range specifications, which will be of particular interest in some applications. All design computations required for the new results in this paper can be completed using linear matrix inequalities. A simulation example is given to illustrate the theoretical developments. © 2017

关键词： Linear matrix inequalities controllers Design Discrete time control systems Learning algorithms Linear systems Two term control systems Design computations Discrete linear systems Feed forward controllers Iterative learning control Iterative learning control laws Linear repetitive process Monotonic convergence Theoretical development

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Influence of herbicide 2,4-D dimethylamine 865SL on photosynthetic mechanism of algae species Chlorella Kessleri immobilized in a biochip

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AIP Conference Proceedings 2019年第1期2169卷

作者： Lazuardi Umar Valendry Harvenda Rahmondia Nanda Setiadi Tetty Marta Linda Joachim Wiest 1Department of Physics Universitas Riau Pekanbaru Indonesia 2Department of Biology Universitas Riau Pekanbaru Indonesia 3cellasys GmbH Kronburg Germany 4Technical University of Munich Heinz-Nixdorf-Chair of Biomedical Electronics Department of Electrical and Computer Engineering TranslaTUM Munich Germany

Algae are very important to the life of human as a bio-indicator of water pollution. The observation of algae vitality can give information of the environment changes of the algae, which are shown by the changes of parameter in its environment. This study is aimed to observe the influence of toxicity of herbicide 2,4-D dimethylamine 865 SL on the vitality of algae species Chlorella Kessleri in producing dissolved oxygen as a result of photosynthetic mechanism. A 50 µL herbicide 2,4-D dimethylamine 865 SL with a concentration of 10 % was added into immobilized algae in the Biochip-C from cellasys GmbH and stimulated with artificial light of 400-700 nm for photosynthetic process. The effect of herbicide 2,4-D dimethylamine 865 SL was observed and shows the increase of the basal potential after 1500 s, which indicates the dissolved oxygen reduction in the environment of the algae. This effect is reversible and a restoration of the photosynthetic activity take place after the substance removal. The use of this toxin is systemic, which slowly kill the living cells.

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Detection of pores in additive manufactured parts by near field response of laser-induced ultrasound

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AIP Conference Proceedings 2019年第1期2102卷

作者： Timothy A. Bigelow Benjamin Schneider Hossein Taheri 1Department of Electrical and Computer Engineering Iowa State University 1915 Scholl Road Ames IA 50011 USA 2Department of Mechanical Engineering Iowa State University 1915 Scholl Road Ames IA 50011 USA 3Department of Manufacturing Engineering Georgia Southern University P.O. Box 7991 Statesboro GA 30460 USA

In-line monitoring of 3D printed parts is vital if quality is to be maintained with this new manufacturing modality. Specifically, the reliable detection of pores in printed parts is vital if the finished products are to have the desired strength characteristics. In this work, we utilize COMSOL(Burlington, MA) to numerically compare a new detection method where the interferometer and laser-generated ultrasound are focused at the same spatial location. The changes in the surface response to defects in the near-field of the induced ultrasound wave are then assessed as a function of defect size and depth. Our numerical results demonstrated that the impact of defects was easier to visualize when quantifying the surface velocity as opposed to surface displacement. The amplitude of the difference is comparable to that observed when utilizing scattering of the Rayleigh wave in the detection. However, the new approach does not require a 1 mm separation between the laser-generating ultrasound spot and the interferometer improving the spatial resolution of the detection.

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Two-dimensional sparse wavenumber recovery for guided wavefields

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AIP Conference Proceedings 2018年第1期1949卷

作者： Soroosh Sabeti Joel B. Harley 1Department of Electrical and Computer Engineering University of Utah USA 2Department of Mechanical Engineering University of Utah USA

The multi-modal and dispersive behavior of guided waves is often characterized by their dispersion curves, which describe their frequency-wavenumber behavior. In prior work, compressive sensing based techniques, such as sparse wavenumber analysis (SWA), have been capable of recovering dispersion curves from limited data samples. A major limitation of SWA, however, is the assumption that the structure is isotropic. As a result, SWA fails when applied to composites and other anisotropic structures. There have been efforts to address this issue in the literature, but they either are not easily generalizable or do not sufficiently express the data. In this paper, we enhance the existing approaches by employing a two-dimensional wavenumber model to account for direction-dependent velocities in anisotropic media. We integrate this model with tools from compressive sensing to reconstruct a wavefield from incomplete data. Specifically, we create a modified two-dimensional orthogonal matching pursuit algorithm that takes an undersampled wavefield image, with specified unknown elements, and determines its sparse wavenumber characteristics. We then recover the entire wavefield from the sparse representations obtained with our small number of data samples.

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Parallel medical imaging for intelligent medical image analysis: Concepts, methods, and applications

arXiv

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arXiv 2019年

作者： Gou, Chao Shen, Tianyu Zheng, Wenbo Xue, Huadan Yu, Hui Ji, Qiang Jin, Zhengyu Wang, Fei-Yue School of Intelligent Systems Engineering Sun Yat-sen University Guangzhou510275 China The State Key Laboratory for Management and Control of Complex Systems Institute of Automation Chinese Academy of Sciences Beijing100190 China University of Chinese Academy of Sciences Beijing100049 China School of Software Engineering Xi’an Jiaotong University Xi’an710049 China Department of Radiology Peking Union Medical College Hospital Chinese Academy of Medical Sciences Peking Union Medical College Beijing100730 China School of Creative Technologies University of Portsmouth PortsmouthPO1 2DJ United Kingdom Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Qingdao Academy of Intelligent Industries Qingdao266000 China

Data-driven artificial intelligence technologies have made much progress in medical image analysis in the last decades. However, it still remains challenging due to its distinctive complexity of acquiring and annotating image data, extracting medical domain knowledge, and explaining the diagnostic decision for medical image analysis. In this paper, we propose a data-knowledge-driven framework termed as Parallel Medical Imaging (PMI) for intelligent medical image analysis based on the methodology of interactive ACP-based parallel intelligence. In the PMI framework, computational experiments with predictive learning in a data-driven way are conducted to extract medical knowledge for diagnostic decision support. Artificial imaging systems are introduced to select and prescriptively generate medical image data in a knowledge-driven way to utilize medical domain knowledge. Through the closed-loop optimization based on parallel execution, our proposed PMI framework can boost the generalization ability and alleviate the limitation of medical interpretation for diagnostic decisions. Furthermore, we illustrate the preliminary implementation of PMI method through the case studies of mammogram analysis and skin lesion image analysis. Experimental results on several public medical image datasets demonstrate the effectiveness of proposed PMI. © 2019, CC BY.

关键词： Medical imaging

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Advanced automobile crash detection by acoustic methods

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Proceedings of Meetings on Acoustics 2019年第1期39卷

作者： Keegan Yi Hang Sim Yijia Chen Yuxuan Wan Kevin Chau 1Department of Electronic and Computer Engineering Hong Kong University of Science and Technology Clear Water Bay HONG KONG yhsim@connect.ust.hk eekchau@ust.hk 2Department of Computer Science and Engineering Hong Kong University of Science and Technology Clear Water Bay HONG KONG ychenfo@connect.ust.hk 3Department of Computer Engineering Hong Kong University of Science and Technology Clear Water Bay HONG KONG ywanaf@connect.ust.hk

Today’s automobiles are equipped with an increasing variety of safety features, yet the use of acoustic methods for automobile crash prevention and detection has been somewhat limited even though the acoustic waves generated during such events can offer valuable information. For example, the high-pitched squealing caused by tire skidding can provide advance warning especially if it is caused by an adjacent car. During car collisions, the elastic waves traveling along the steel car frame are 17 times faster than the speed of sound in air, which can signal a crash more promptly than center-mounted acceleration sensors. To make full use of the high-speed acoustic signals, a wavelet-based algorithm implementable in real-time has been developed to isolate and detect specific pre-crash and crash events such as honking, tire skidding and collision in multi-channel acoustic datasets. The proposed algorithm offers distinct advantages in sudden onset detection, temporal localization accuracy, and computational cost over existing time- and frequency-domain methods. Results demonstrated on a crash scenario are indicative of a substantial enhancement in automobile pre-crash and crash detection performance by acoustic methods.

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High performance implementation of Wolf’s method

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AIP Conference Proceedings 2018年第1期1978卷

作者： Pedro Alberti-Villalobos Sebastián Molina-Adasme Patricia Maldonado-Cárdenas 1Department of Computer Engineering University of Magallanes. 621-0427. Punta Arenas Chile

The method of Wolf, basically provides the calculation of the maximum exponent of Lyapunov by the evolution of the distance between two points closes from two nearby paths. This enables the quantification of the chaos through the sign of the exponent, is also an important tool as an indicator of the predictability of a time series. The algorithm presented by Alan Wolf is not very efficient because of a search performed by brute force, therefore, the execution times turn out to be very high, here is where lies the importance of the parallelization of this method. In the present work, two parallel implementations of the method of Wolf shared memory platforms, described the first using the API second based for GPU, and OpenMP using NVIDIA CUDA platform. The results obtained in terms of execution time decreased approximately above 90%, for all patients in study for parallel OpenMP program. In the case of the parallel program on GPU, achieved a decrease of runtimes between approximately 15% and 65% (depending on the case study), in comparison to the parallel OpenMP version; and even more, a considerable decrease of time in comparison to the sequential version.

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A block based secret sharing scheme using Hilbert matrix and RSA

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AIP Conference Proceedings 2019年第1期2112卷

作者： S. Thalapathiraj P. Mohamed Fathimal B. Baskaran 1Department of Mathematics SRM Institute of Science and Technology Vadapalani campus Chennai Tamilnadu India 2Department of Computer science and Engineering SRM Institute of Science and Technology Vadapalani campus Chennai Tamilnadu India 3Department of Mathematics SRM Institute of Science and Technology Vadapalani campus Chennai Tamilnadu India

Due to the impact of network technology, all information are transmitted in digital mode and the security of information is ever more important. In order to ensure the secret messages are not been stolen when transmitting, it will be a good countermeasure to encrypt the secret message before transmitting. The level of security of information is based on the number of participants. Security is definite when a single person is involved. In the scenario, if many people are involved, security may be ensured if secrets are kept in. This lead the direction for researchers to develop new cryptographic scheme in the past two decades. This paper proposes techniques for transmission of secret messages between two parties and also sharing of messages between multiple parties. These methods uses well known public key cryptography algorithm RSA and Hilbert matrix for authentication and encryption. The proposed method overcome the issues addressed by the existing scheme and ensures secure transmission of text messages with less computational Complexity and no additional code book. The proposed (N, N) Secret sharing Scheme also reduces the overhead of generation of keys for each pair of parties.

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A Novel Line Feature Description and Matching Method for Visual-Aided Inertial Navigation System

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Journal of Physics: Conference Series 2019年第1期1267卷

作者： Xingxing Guang Yanbin Gao Pan Liu Guangchun Li College of Automation Harbin Engineering University Harbin 150001 China Department of Electrical and Computer Engineering University of Calgary Calgary AB T2N1N4 Canada Beijing Institute of Control and Electronic Technology Beijing 100032 China

With the rapid development of machine vision technology, more and more attention has been paid to the visual-aided inertial navigation system. It is important that to extract and track the line features at the dynamic situation in the visual-aided inertial navigation system which is based on visual line feature information to compensate attitude errors. A novel line feature description is proposed that use the SURF points to mark the LSD lines. Then, through coarse matching and fine matching, the function of continuously tracking the one line features in different images was realized. These line feature description and tracking method are applied in the visual-aided inertial navigation system, and its effectiveness is verified by the vehicle experiment.

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Data-driven gradient algorithm for high-precision quantum control

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Physical Review A 2018年第4期97卷 042122-042122页

作者： Re-Bing Wu Bing Chu David H. Owens Herschel Rabitz Department of Automation Tsinghua University Beijing 100084 China Center for Quantum Information Science and Technology BNRist Beijing 100084 China School of Electronic and Computer Science University of Southampton Southampton SO17 1BJ United Kingdom Department of Automation Zhengzhou University Zhengzhou 450001 China Department of Automatic Control and Systems Engineering University of Sheffield Mappin Street Sheffield S1 3JD United Kingdom Department of Chemistry Princeton University Princeton 08544 NJ United States

In the quest to achieve scalable quantum information processing technologies, gradient-based optimal control algorithms (e.g., grape) are broadly used for implementing high-precision quantum gates, but their performance is often hindered by deterministic or random errors in the system model and the control electronics. In this paper, we show that grape can be taught to be more effective by jointly learning from the design model and the experimental data obtained from process tomography. The resulting data-driven gradient optimization algorithm (d-grape) can in principle correct all deterministic gate errors, with a mild efficiency loss. The d-grape algorithm may become more powerful with broadband controls that involve a large number of control parameters, while other algorithms usually slow down due to the increased size of the search space. These advantages are demonstrated by simulating the implementation of a two-qubit controlled-not gate.

关键词： Quantum control Quantum gates

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