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Measurement and analysis of motor-noise in underwater glider

IOP Conference Series: Earth and Environmental science 2021年第1期725卷

作者： Qing Zhou Yihao Zhao Maofa Wang Science and Technology on Communication Information Security Control Laboratory Jiaxing 314033 China No.36 Research Institute of CETC Jiaxing 314033 China Ocean Engineering Research Center Hangzhou Dianzi University Hangzhou 310018 China

Self-noise is a very disadvantageous factor for underwater glider to observe ocean ambient noise, in which the noise caused by motor is very significant. In order to grasp the characteristics of the motor-noise and its influence on the measurement of ocean ambient noise, a long-term sea trial was conducted in the South China Sea in May 2020, and the self-noise data of underwater glider under different working conditions are obtained. By analyzing the noise level and spectrum level of the motor noise, we obtained the self-noise spectrum characteristics and know that the influence of control motor noise on the noise measurement of head and tail hydrophone is mainly below 5 kHz band, and the influence of full-frequency noise level brought by motor is within 10dB and 5dB respectively. The results lay an important foundation for further analysis of ocean ambient noise measured by underwater glider.

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Privacy-preserving medical treatment system through nondeterministic finite automata

arXiv

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arXiv 2020年

作者： Yang, Yang Deng, Robert H. Liu, Ximeng Wu, Yongdong Weng, Jian Zheng, Xianghan Rong, Chunming School of Information Systems Singapore Management University Singapore College of Mathematics and Computer Science Fuzhou University Fujian China State Key Laboratory of Integrated Services Networks Xidian University Guangdong Provincial Key Laboratory of Data Security and Privacy Protection Guangzhou China Fujian Provincial Key Laboratory of Information Processing and Intelligent Control Minjiang University Fuzhou China School of Information Systems Singapore Management University Singapore Singapore Department of Computer Science Jinan University Guangdong China College of Mathematics and Computer Science Fuzhou University Fujian China Department of Electronic Engineering and Computer Science University of Stavanger Norway MingByte Technology Qingdao China

In this paper, we propose a privacy-preserving medical treatment system using nondeterministic finite automata (NFA), hereafter referred to as P-Med, designed for the remote medical environment. P-Med makes use of the nondeterministic transition characteristic of NFA to flexibly represent the medical model, which includes illness states, treatment methods and state transitions caused by exerting different treatment methods. A medical model is encrypted and outsourced to the cloud to deliver telemedicine services. Using P-Med, patient-centric diagnosis and treatment can be made on-the-fly while protecting the confidentiality of a patient's illness states and treatment recommendation results. Moreover, a new privacy-preserving NFA evaluation method is given in P-Med to get a confidential match result for the evaluation of an encrypted NFA and an encrypted data set, which avoids the cumbersome inner state transition determination. We demonstrate that P-Med realizes treatment procedure recommendation without privacy leakage to unauthorized parties. We conduct extensive experiments and analyses to evaluate efficiency. Copyright © 2020, The Authors. All rights reserved.

关键词： Diseases

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From concept to action: a united, holistic and One Health approach to respond to the climate change crisis

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Infectious Diseases of Poverty 2022年第1期11卷 68-73页

作者： Renhe Zhang Xu Tang Jian Liu Martin Visbeck Huadong Guo Virginia Murray Catherine Mcgillycuddy Bing Ke Gretchen Kalonji Panmao Zhai Xiaoming Shi Jiahai Lu Xiaonong Zhou Haidong Kan Qunli Han Qian Ye Yong Luo Jianmin Chen Wenjia Cai Huiling Ouyang Riyanti Djalante Alexander Baklanov Lu Ren Guy Brasseur George Fu Gao Lei Zhou Integrated Research on Disaster Risk International Centre of Excellence on Risk Interconnectivity and Governance on Weather/Climate Extremes Impact and Public Health&Institute of Atmospheric Sciences Fudan UniversityShanghai200438China Science Division United Nations Environment Programme(UNEP)United Nations AvenueGigiriPO Box 30552Nairobi00100Kenya GEOMAR Helmholtz Centre for Ocean Research Kiel and Kiel University KielGermany Key Laboratory of Digital Earth Science Aerospace Information Research InstituteChinese Academy of SciencesBeijingChina University of Chinese Academy of Sciences Chinese Academy of SciencesBeijingChina UK Health Security Agency LondonSE18UGUK The Administrative Center for China’s Agenda 21 Ministry of Science and Technology of ChinaBeijing100038China Institute for Disaster Management and Reconstruction Sichuan UniversityChengdu610207China State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesBeijing100081China China CDC Key Laboratory of Environment and Population Health National Institute of Environmental HealthChinese Center for Disease Control and PreventionBeijing100021China One Health Center of Excellence for Research and Training School of Public HealthSun Yat-Sen UniversityGuangzhouChina National Institute of Parasitic Diseases Chinese Center for Disease Control and Prevention(Chinese Center for Tropical Diseases Research)ShanghaiChina Integrated Research On Disaster Risk-IPO BeijingChina State Key Lab of Earth Surface Processes and Resource Ecology Beijing Normal UniversityBeijing100875China Ministry of Education Key Laboratory for Earth System Modeling and Department of Earth System ScienceTsinghua UniversityBeijingChina ASEAN Secretariat Indonesia Integrated Research on Disaster Risk(IRDR)JakartaIndonesia Science and Innovation Department World Meteorological Organization(WMO)7 bisAvenue de la PaixBP2300CH-1211Geneva 2Switzerland Max Planck Institute for Meteorology HamburgGermany Chinese Center for Dis

It is unequivocal that human influence has warmed the planet,which is seriously affecting the planetary health including human *** climate change should not only be a slogan,but requires a united,holistic action and a paradigm shift from crisis response to an ambitious and integrated approach *** the urgent needs to tackle the risk connection between climate change and One Health,the four key messages and recommendations that with the intent to guide further research and to promote international cooperation to achieve a more climate-resilient world are provided.

关键词： Climate change One Health International coordination and cooperation Risk-oriented recommendations

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SAR Ship Target Detection Based on 2D Singularity Power Spectrum

SAR Ship Target Detection Based on 2D Singularity Power Spec...

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IEEE International Conference on Radar

作者： Gang Xiong Fang Wang Lijun Wang Jin He School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Dept. of Statistical Information Shanghai Jiao Tong University Shanghai China Science and Technology on Communication Information Security Control Laboratory Jiaxing China

ISBN: (数字)9781728126609

ISBN: (纸本)9781728137858

A novel SAR ship target detection method based on two-dimensional singularity power spectrum (2DSPS) analysis is proposed. The 2D-SPS of SAR images explores a variety of coupling features, including the dispersion of singularity exponent and the power distribution in the singularity domain, and has strong ability in feature extraction for SAR images of pure sea surface, false alarm at sea, small targets and multiple targets under the conditions of complex sea surface. The method of SAR target detection based on 2D-SPS are designed. Using the OpenSAR Dataset, in the background of sea clutter, the simulation results show that the proposed method performs better than the traditional method under the condition of extremely low SNR and strong false alarm, especially for small SAR targets and multiple SAR targets.

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A Dynamic Time Warping Based Wake-Up Signal Detection Method for Underwater Acoustic Communication Networks 2

A Dynamic Time Warping Based Wake-Up Signal Detection Method...

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2nd IEEE Advanced information Management, Communicates, Electronic and Automation control Conference, IMCEC 2018

作者： Ma, Lu Fan, Cheng Sun, Wei Qiao, Gang Science and Technology on Communication Information Security Control Laboratory Jiaxing Zhejiang China College of Underwater Acoustic Engineering Harbin Engineering University Harbin China

ISBN: (纸本)9781538618035

T400 conventional underwater acoustic (UWA) wakeup signals detection methods for both underwater cooperative nodes and non-cooperative nodes are FFT based signal detection and matched-filtered based signal detection. While there is a big performance degradation of these conventional frequency-offset sensitive methods due to the relative motion between nodes, complex underwater noise environment, channel time-varying and other interference sources. This paper proposes a dynamic time warping (DTW) algorithm to detect the wake-up signal in UWA communication networks, which is frequency-offset insensitive and performs better than the conventional methods in severe frequency-offset environment by simulations based on the true UWA channel measured from sea trial. © 2018 IEEE.

关键词： Signal detection

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Comparison of Jamming Methods for Underwater Acoustic DSSS Communication Systems 2

Comparison of Jamming Methods for Underwater Acoustic DSSS C...

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2nd IEEE Advanced information Management, Communicates, Electronic and Automation control Conference, IMCEC 2018

ISBN: (纸本)9781538618035

W399 the development of underwater acoustic communications (UWAC), jamming methods for UWAC becomes much more attentive in communication countermeasure system. Direct sequence spread spectrum (DSSS) signal as a way of reliable covert communications is widely used for UWA channels. In this paper, single-tone jamming, narrowband jamming and correlated jamming based on PN code PSK modulation for UWA DSSS communication system are compared under different signal-to-noise ratio first, which assumes that the jammer knows perfect parameters in DSSS signal. Besides, performance of the above three jamming methods are compared by simulations under the blind estimates of carrier frequency, chip length, period of PN code and PN code itself, which demonstrates the influence of the estimation error on these jamming methods. © 2018 IEEE.

关键词： Underwater acoustic communication

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A Real-Time Detection System for Non-Cooperative Underwater Acoustic DSSS Signals Based on LabVIEW 2

A Real-Time Detection System for Non-Cooperative Underwater ...

引用

2nd IEEE Advanced information Management, Communicates, Electronic and Automation control Conference, IMCEC 2018

ISBN: (纸本)9781538618035

B397 of the good concealment, the application of DSSS signals are more and more attractive in underwater acoustic (UWA) communication. While for UWA communication countermeasure system, blind detection of non-cooperative UWA DSSS signals is the first and essential step. A software for non-cooperative UWA DSSS signals detection is developed based on LabVIEW, which integrates power spectrum method, cepstrum method, autocorrelation method and corresponding improved methods. With the help of acquisition card and acoustic transducer, many functions can be implemented such as real-time acquisition and storage, detection processing and the results display for the received signals. What's more, different detection methods can be independently or jointly used by arbitrarily adjusting the display and control interface in real time. © 2018 IEEE.

关键词： Underwater acoustics

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Object Detection Based On Decision Level Fusion

Object Detection Based On Decision Level Fusion

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Chinese Automation Congress (CAC)

作者： Jun Yao Yong Zhang Fang Liu Yi-cong Liu College of Science Shengyang Ligong University Shenyang China Science and Technology on Electro-Optical Information Security Control Laboratory Tianjing China School of Automation and Electrical Engineering Shengyang Ligong University Shenyang China

Object detection is widely used in different fields. In this paper, a new object detection model of decision level fusion based on Mask R-CNN is proposed. The model fuses the infrared images and the visible images at decision-making level. It is called as IVF-Mask R-CNN. In order to improve the stability and the accuracy of the IVF-Mask R-CNN model, the partial network freeze strategy, learning rate reduction strategy and test image up-sizing strategy are used. The fuse model IVF-Mask R-CNN compensates the limitation of single imaging model of object detection. It improves the accuracy of the detection. The experimental results show that IVF-Mask R-CNN model contributes to a better object detection effect compared with the single visible detection model and the infrared detection model.

关键词： Object detection Training Feature extraction Imaging Head Convolution Classification algorithms

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Object Detection Based on Improved YOLOv3-tiny

Object Detection Based on Improved YOLOv3-tiny

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Chinese Automation Congress (CAC)

作者： Hua Gong Hui Li Ke Xu Yong Zhang College of Science Shengyang Ligong University Shenyang China School of Automation and Electrical Engineering Shengyang Ligong University Shenyang China Science and Technology on Electro-Optical Information Security Control Laboratory Tianjing China

Deep learning has gradually become the mainstream object detection algorithm because of its powerful feature extraction ability and adaptive ability. However, how to guarantee the accuracy and speed is still a huge challenge in the field of object detection. This paper proposes an improved YOLOv3-tiny for object detection based on the idea of feature fusion. YOLOv3-tiny is chosen as the basic network framework to ensure the identification speed. In order to improve the poor detection accuracy of YOLOv3-tiny network, feature fusion is carried out based on Feature Pyramid Network. The last DBL (Darknetconv2d_ Batch Normalization_Leaky) output of the second scale output layer is fused with the fourth DBL output of the network. And a 52$\times$ 52 scale output is added on the basis of the original network. Experiments were carried out on our dataset. The experimental results show that compared with YOLOv3-tiny, the accuracy of the improved network structure is increased by 6.3%, and the detection speed is 31.8fps, ensuring the requirements of real-time detection.

关键词： Feature extraction Object detection Real-time systems Training Convolution Microprocessors Computer architecture

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Characterization and acid-mobilization study for typical iron- bearing clay mineral

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Journal of Environmental sciences 2018年第9期30卷 222-232页

作者： Zhenzhen Wang Rui Li Lulu Cui Hongbo Fu Jun Lin Jianmin Chen Shanghai Key Laboratory Atmospheric Particle Pollution and Prevention Department of Environmental Science and EngineeringFudan University Shanghai 200433 China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Nanjing University of Information Science and Technology Nanjing 210044 China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092 China Key Laboratory of Nuclear Analysis Techniques Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800 China

In this study, iron speciation in five standard clay samples was characterized. Iron mobilization from these clays was then measured in acidic media. For comparison, a commercially available Arizona test dust （ATD） was also observed. The results showed that the free-Fe contents of clays were commonly lower than that of dust aerosols. The components of clays were dominant by the structural Fe held in the aluminosilicate lattice. The iron solubility of the clays were in the order of KGa-2 〉 SWy-2 〉 CCa-2 〉 IMt-2 〉 NAu- 2. Based upon the M6ssbauer spectrum and transmission electron microscopy （TEM） analysis, the Fe（Ⅱ） fraction and the Fe/Si ratio of clay particles changed after dissolution, suggesting the total Fe solubility depended on the Fe atom states existing within the aluminosilicate lattice. The Fe in KGa-2 and SWy-2 was most likely substituted for alkaline elements as the interlayer ions held by ionic bonds in the aluminosilicate, which are more liable to dissolution. However, the Fe in NAu-2 was more likely to be bound by strong covalent bonds in aluminosilicate mineral, which is less soluble. The much highly soluble Fe in ATD was not only linked to the dissolution of an appreciable fraction of Fe（Ⅱ）, but also could be attributed to the fact that the Fe bonds in the clay fraction of ATD were mainly present as ionic bonds. The TEM images showed that reacted clay particles displayed less aggregate particles, with nanoparticle aggregates and the Fe/S-rich tiny particles attached to the remains.

关键词： Clay particles Dust Iron mobilization Marine primary productivity

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