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A new technique for high-fidelity cutting technology for hydrate samples

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2022年第1期23卷 40-54页

作者： Hai ZHU Jia-wang CHEN Zi-qiang REN Pei-hao ZHANG Qiao-ling GAO Xiao-ling LE Chun-ying XU Kai HE Peng ZHOU Feng GAO Yu-ping FANG Institute of Ocean Engineering and Technology Ocean CollegeZhejiang UniversityZhoushan316021China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou511458China Key Lab of Digital Signal and Image Processing of Guangdong Province School of EngineeringShantou UniversityShantou515063China

Designing a high-fidelity cutting device is one of the difficulties in hydrate samples pressure-holding *** to the limitations of the existing mechanical system,there is much damage to the cut surface of hydrate samples,with many chips produced,which seriously affects the quality of *** this paper,a new cutting device utilizes two servo motors to achieve a high degree of *** the Archimedes spiral,it achieves low disturbance of the cut surface and provides accurate control of the *** addition,due to the operation of the sample long-stroke push unit,cutting hydrate samples of any length with almost no chips within a short cutting time can be *** and sea tests have achieved all design requirements of the equipment and strongly demonstrate its benefit and *** is concluded that this new high-fidelity cutting technology is practically *** physical state of the hydrate can be maintained to the greatest extent,and thus the new equipment provides significant support for the exploration and development of hydrate resources.

关键词： High-fidelity Cutting technology Hydrate samples Automation

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International Conference on Acoustics, Speech, and Signal processing (ICASSP)

作者： Jinhai Yang Hua Yang Institution of Image Communication and Network Engineering Shanghai Jiao Tong University China Shanghai Key Lab of Digital Media Processing and Transmission Shanghai China

Few-shot learning aims for rapid adaptation with few samples. Recently, cross-granularity few-shot learning has emerged as a promising research area, where models observe coarse labels but target fine-grained recognition among novel classes. As coarse supervision tends to eliminate feature discrimination among underlying sub-classes, existing methods commonly utilize self-supervision as a complement to explore intra-class variation. However, current methods suffer from an intrinsic conflict between contrastive learning and coarse supervision. In this paper, we locate the root cause of the intrinsic conflict. Then, we resolve it by exploiting the similarity among augmented views while ignoring the unreasonable constraint between negative pairs. Besides, we decouple contrastive learning and coarse supervision into parallel branches to better regularize the latent space. Albeit simple, our approach consistently outperforms state-of-the-art methods across different benchmarks.

关键词： Adaptation models Target recognition Semantics Signal processing Performance gain Benchmark testing Acoustics

AI WALKUP: A Computer-Vision Approach to Quantifying MDS-UPDRS in Parkinson's Disease

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arXiv 2024年

作者： Xiang, Xiang Zhang, Zihan Ma, Jing Deng, Yao Key Lab of Image Processing and Intelligent Control Ministry of Education School of Artificial Intelligence and Automation Huazhong University of Science and Technology Wuhan430074 China

Parkinson's Disease (PD) is the second most common neurodegenerative disorder. The existing assessment method for PD is usually the Movement Disorder Society - Unified Parkinson's Disease Rating Scale (MDS-UPDRS) to assess the severity of various types of motor symptoms and disease progression. However, manual assessment suffers from high subjectivity, lack of consistency, and high cost and low efficiency of manual communication. We want to use a computer vision based solution to capture human pose images based on a camera, reconstruct and perform motion analysis using algorithms, and extract the features of the amount of motion through feature engineering. The proposed approach can be deployed on different smartphones, and the video recording and artificial intelligence analysis can be done quickly and easily through our APP. Copyright © 2024, The Authors. All rights reserved.

关键词： Computer vision

Genetic U-Net: Automatically designed deep networks for retinal vessel segmentation using a genetic algorithm

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arXiv 2020年

作者： Wei, Jiahong Fan, Zhun Department of Electronic Engineering Shantou University Guangdong515063 China Key Lab of Digital Signal and Image Processing of Guangdong Province Guangdong515063 China

Recently, many methods based on hand-designed convolutional neural networks (CNNs) have achieved promising results in automatic retinal vessel segmentation. However, these CNNs remain constrained in capturing retinal vessels in complex fundus images. To improve their segmentation performance, these CNNs tend to have many parameters, which may lead to overfitting and high computational complexity. Moreover, the manual design of competitive CNNs is time-consuming and requires extensive empirical knowledge. Herein, a novel automated design method, called Genetic U-Net, is proposed to generate a U-shaped CNN that can achieve better retinal vessel segmentation but with fewer architecture-based parameters, thereby addressing the above issues. First, we devised a condensed but flexible search space based on a U-shaped encoder-decoder. Then, we used an improved genetic algorithm to identify better-performing architectures in the search space and investigated the possibility of finding a superior network architecture with fewer parameters. The experimental results show that the architecture obtained using the proposed method offered a superior performance with less than 1% of the number of the original U-Net parameters in particular and with significantly fewer parameters than other state-of-the-art models. Furthermore, through in-depth investigation of the experimental results, several effective operations and patterns of networks to generate superior retinal vessel segmentations were identified. Copyright © 2020, The Authors. All rights reserved.

关键词： Genetic algorithms

A novel cross-lingual voice cloning approach with a few text-free samples

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arXiv 2019年

作者： Zhou, Xinyong Che, Hao Wang, Xiaorui Xie, Lei Shaanxi Provincial Key Lab of Speech and Image Information Processing School of Computer Science Northwestern Polytechnical University Xian China Kwai Beijing China

This paper proposes a novel cross-lingual voice cloning framework by utilizing bottleneck (BN) features obtained from speaker-independent automatic speech recognition system in the target language. Firstly, we use audio-text pairs of a single speaker in the target language to train a latent prosody model, which models the relationships between the text and the BN features. Then the acoustic model, which translates the BN features to the acoustic features, is trained with multi-speaker's audio data in the target language. Finally, the acoustic model is fine-tuned with target speaker's speech in the original language without the corresponding texts, as the BN features are served as the bridge. Our approach has the following advantages: 1) no recordings from bilingual speakers are required;2) audio-text pairs are not required for acoustic model training;3) no extra complicated modules are needed to encode speaker or language. Experimental results show that, with only several minutes of audio from a new English speaker, our proposed system can synthesize this speaker's Mandarin speech with decent naturalness and speaker similarity. Copyright © 2019, The Authors. All rights reserved.

关键词： Cloning

REMOTE SENSING image CLASSIFICATION BASED ON MULTIPLE MORPHOLOGICAL COMPONENT ANALYSIS

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REMOTE SENSING IMAGE CLASSIFICATION BASED ON MULTIPLE MORPHO...

IEEE International Geoscience and Remote Sensing Symposium

作者： Xiang Xu Jun Li Mauro Dalla Mura Guangdong Key Laboratory for Urbanization and Geo-Simulation School of Geography and Planning Sun Yat-sen University GIPSA-Lab Department of Image and Signal Processing

ISBN: (纸本)9781479979301

In this work, we propose a new multiple morphological component analysis (MMCA) based decomposition framework for remote sensing image classification. The proposed MMCA framework aims at exploiting relevant textural characteristics present in a scene such as content, coarseness, contrast or directionality. Specifically, MMCA decomposes an image into a pair of morphological components (for each textural characteristic), which can be associated to a smooth and a textural components. The extracted features are then used for classification with a multinomial logistic regression (MLR). The experimental results, conducted using both a hyperspectral and a synthetic aperture radar (SAR) images, reveal that the proposed scheme can lead to state-of-the-art classification accuracy.

关键词： Remote sensing image classification Multiple morphological component analysis (MMCA) Textural features

Tiny noise, big mistakes: adversarial perturbations induce errors in brain–computer interface spellers

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National Science Review 2021年第4期8卷 78-90页

作者： Xiao Zhang Dongrui Wu Lieyun Ding Hanbin Luo Chin-Teng Lin Tzyy-Ping Jung Ricardo Chavarriaga Ministry of Education Key Laboratory of Image Processing and Intelligent Control School of Artificial Intelligence and AutomationHuazhong University of Science and Technology School of Civil Engineering and Mechanics Huazhong University of Science and Technology Centre of Artificial Intelligence Faculty of Engineering and Information Technology University of Technology Sydney Swartz Center for Computational Neuroscience Institute for Neural ComputationUniversity of California San Diego Center for Advanced Neurological Engineering Institute of Engineering in Medicine University of California San Diego ZHAW Data Lab Zürich University of Applied Sciences

An electroencephalogram(EEG)-based brain–computer interface(BCI) speller allows a user to input text to a computer by thought. It is particularly useful to severely disabled individuals, e.g. amyotrophic lateral sclerosis patients, who have no other effective means of communication with another person or a *** studies so far focused on making EEG-based BCI spellers faster and more reliable; however, few have considered their security. This study, for the first time, shows that P300 and steady-state visual evoked potential BCI spellers are very vulnerable, i.e. they can be severely attacked by adversarial perturbations,which are too tiny to be noticed when added to EEG signals, but can mislead the spellers to spell anything the attacker wants. The consequence could range from merely user frustration to severe misdiagnosis in clinical applications. We hope our research can attract more attention to the security of EEG-based BCI spellers, and more broadly, EEG-based BCIs, which has received little attention before.

关键词： electroencephalogram brain-computer interfaces BCI spellers adversarial examples

Push and Pull Search Embedded in an M2M Framework for Solving Constrained Multi-objective Optimization Problems

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arXiv 2019年

作者： Fan, Zhun Wang, Zhaojun Li, Wenji Yuan, Yutong You, Yugen Yang, Zhi Sun, Fuzan Ruan, Jie Li, Zhaocheng Department of Electronic Engineering Shantou University Guangdong China Key Lab of Digital Signal and Image Processing of Guangdong Province Shantou University Guangdong China

In dealing with constrained multi-objective optimization problems (CMOPs), a key issue of multi-objective evolutionary algorithms (MOEAs) is to balance the convergence and diversity of working populations. However, most state-of-the-art MOEAs show poor performance in balancing them, and can easily cause the working populations to concentrate on a part of regions of the Pareto fronts, leading to a serious imbalanced searching between preserving diversity and achieving convergence. This paper proposes a method which combines a multi-objective to multi-objective (M2M) approach with the push and pull search (PPS) framework, namely PPS-M2M. To be more specific, the proposed algorithm decomposes a CMOP into a set of simple CMOPs. Each simple CMOP corresponds to a sub-population and is solved in a collaborative manner. When dealing with constraints, each sub-population follows a procedure of "ignore the constraints in the push stage and consider the constraints in the pull stage", which helps each working sub-population get across infeasible regions. In order to evaluate the performance of the proposed PPS-M2M, it is compared with the other six algorithms, including M2M, MOEA/D-Epsilon, MOEA/D-SR, MOEA/D-CDP, C-MOEA/D and NSGA-II-CDP on a set of benchmark CMOPs. The experimental results show that the PPS-M2M is significantly better than the other six algorithms. Copyright © 2019, The Authors. All rights reserved.

关键词： Constraint handling

Modified radius-vector function for shape contour description

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Modified radius-vector function for shape contour descriptio...

International Conference on Computational Science and its Applications, ICCSA 2004

作者： Kang, Sung Kwan Ahmad, Muhammad Bilal Chun, Jong Hun Kim, Pan Koo Park, Jong An Dept. of Information and Communications Engineering Chosun University Gwangju Korea Republic of Signal and Image Processing Lab Dept. of Mechatronics Kwangju Institute of Science and Technology Gwangju Korea Republic of Provincial College of Namdo Korea Republic of College of Electronics and Information Engineering Chosun University Gwangju Korea Republic of

ISBN: (纸本)3540220607

Shape is one of the salient features of visual content and can be used in visual information retrieval. Radius vector function for star-shaped objects is available. A modified radius-vector function for both types of shapes-star shaped, and non-star shaped is presented. The center of gravity is selected as the reference point. The corner points are marked as the nodes. Normalized vectors are calculated from the reference point to the corner nodes. The normalized vectors are arranged in ascending order, and the Euclidean distance of the query object with database objects is used for shape matching criteria. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Vectors