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Quantum algorithms of state estimators in classical control systems

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Science China(Information Sciences) 2020年第9期63卷 243-254页

作者： kai LI Hongyi DAI ming ZHANG College of Intelligence Science National University of Defense Technology College of Liberal Arts and Sciences National University of Defense Technology

In this paper, quantum algorithms are applied to the design of state estimators in classical control systems under the condition that quantum algorithms can be physically implemented. We demonstrate that the design of state estimators can be solved by quantum algorithms, which may achieve significant acceleration in comparison to traditional classical algorithms. The time complexity can be reduced from O(n6) to O(qn)when the system matrix is sparse and the condition number κ and the reciprocal of precision ? are small in size O(poly log(n)), where n is the dimension of state x(t) and q is the dimension of input u(t). Our research will provide an entire quantum scheme of constructing state estimators and can be regarded as an attempt to widen application scope of quantum computation.

关键词： quantum computation estimators for linear systems optimization algorithms quantum acceleration time complexity

Intelligent geochemical interpretation of mass chromatograms:Based on convolution neural network

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Petroleum Science 2024年第2期21卷 752-764页

作者： kai-ming Su Jun-Gang Lu Jian Yu Zi-Xing Lu Shi-Jia chen Hubei Key Laboratory of Petroleum Geochemistry and Environment Wuhan430100HubeiChina College of Resources and Environment Yangtze UniversityWuhan430100HubeiChina School of Geoscience and Technology Southwest Petroleum UniversityChengdu610500SichuanChina Changqing Oilfield Company PetroChinaXi'an710021ShaanxiChina

Gas chromatography-mass spectrometry(GC-MS)is an extremely important analytical technique that is widely used in organic *** is the only approach to capture biomarker features of organic matter and provides the key evidence for oil-source correlation and thermal maturity ***,the conventional way of processing and interpreting the mass chromatogram is both timeconsuming and labor-intensive,which increases the research cost and restrains extensive applications of this *** overcome this limitation,a correlation model is developed based on the convolution neural network(CNN)to link the mass chromatogram and biomarker features of samples from the Triassic Yanchang Formation,Ordos Basin,*** this way,the mass chromatogram can be automatically *** research first performs dimensionality reduction for 15 biomarker parameters via the factor analysis and then quantifies the biomarker features using two indexes(*** and PMI)that represent the organic matter thermal maturity and parent material type,***,training,interpretation,and validation are performed multiple times using different CNN models to optimize the model structure and hyper-parameter setting,with the mass chromatogram used as the input and the obtained MI and PMI values for supervision(label).The optimized model presents high accuracy in automatically interpreting the mass chromatogram,with R2values typically above 0.85 and0.80 for the thermal maturity and parent material interpretation results,*** significance of this research is twofold:(i)developing an efficient technique for geochemical research;(ii)more importantly,demonstrating the potential of artificial intelligence in organic geochemistry and providing vital references for future related studies.

关键词： Organic geochemistry Biomarker Mass chromatographic analysis Automated interpretation Convolution neural network Machine learning

Microstructure recognition of steels by machine learning based on visual attention mechanism

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Journal of Iron and Steel Research International 2024年第4期31卷 909-923页

作者： Xing-yu chen Lin cheng cheng-yang Hu Yu-peng Zhang kai-ming Wu The State Key Laboratory of Refractories and Metallurgy Hubei Province Key Laboratory of Systems Science on Metallurgical ProcessingInternational Research Institute for Steel TechnologyCollaborative Center on Advanced SteelsWuhan University of Science and TechnologyWuhan 430081HubeiChina Metals Valley and Band(Foshan)Metallic Composite Materials Co. Ltd.Foshan 528000GuangdongChina

U-Net has achieved good performance with the small-scale datasets through skip connections to merge the features of the low-level layers and high-level layers and has been widely utilized in biomedical image segmentation as well as recent microstructure image segregation of the *** representative visual attention mechanism modules,named as squeeze-and-excitation networks,convolutional block attention module,and extended calibration algorithm,were intro-duced into the traditional U-Net architecture to further improve the prediction *** is found that compared with the original U-Net architecture,the evaluation index of the improved U-Net architecture has been significantly improved for the microstructure segmentation of the steels with the ferrite/martensite composite microstructure and pearlite/ferrite composite microstructure and the complex martensite/austenite island/bainite microstructure,which demonstrates the advantages of the utilization of the visual attention mechanism in the microstructure *** reasons for the accuracy improvement were discussed based on the feature maps analysis.

关键词： Microstructure recognition-Steel Machine learning Visual attention mechanism Visualization

Revisiting Persistent Indexing Structures on Intel Optane DCPersistent Memory

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Journal of Computer Science & Technology 2021年第1期36卷 140-157页

作者： Heng Bu ming-kai Dong Ji-Fei Yi Bin-Yu Zang Hai-Bo chen Institute of Parallel and Distributed Systems Shanghai Jiao Tong UniversityShanghai 200240China

Persistent indexing structures are proposed in response to emerging non-volatile memory(NVM)to provide high performance yet durable ***,due to the lack of real NVM hardware,many prior persistent indexing structures were evaluated via emulation,which varies a lot across different setups and differs from the real ***,Intel has released its Optane DC Persistent Memory Module(PMM),which is the first production-ready *** this paper,we revisit popular persistent indexing structures on PMM and conduct comprehensive evaluations to study the performance differences among persistent indexing structures,including persistent hash tables and persistent *** to the evaluation results,we find that Cacheline-Conscious Extendible Hashing(CCEH)achieves the best performance among all evaluated persistent hash tables,and Failure-Atomic ShifT B+-Tree(FAST)and Write Optimal Radix Tree(WORT)perform better than other ***,we find that the insertion performance of hash tables is heavily influenced by data locality,while the insertion latency of trees is dominated by the flush *** also uncover that no existing emulation methods accurately simulate PMM for all the studied data ***,we provide three suggestions on how to fully utilize PMM for better performance,including using clflushopt/clwb with sfence instead of clflush,flushing continuous data in a batch,and avoiding data access immediately after it is flushed to PMM.

关键词： persistent memory data structure performance Intel Optane DC persistent memory module(PMM)

Low-noise,low-power-consumption seafloor vector magnetometer

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Journal of Oceanology and Limnology 2023年第2期41卷 804-815页

作者： Xiaochen LI Xianhu LUO ming DENG Ning QIU Zhen SUN kai chen China University of Geosciences Beijing 100083China Guangzhou Marine Geological Survey China Geological SurveyMinistry of Natural ResourcesGuangzhou 511458Chinaa SCSIO Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China

The seafloor vector magnetometer is an effective tool for marine geomagnetic surveys and seafloor magnetotelluric(MT)***,the noise,power consumption,cost,and volume characteristics of existing seafloor vector magnetometers are insufficient for practical ***,a low-noise,low-power-consumption seafloor vector magnetometer that can be used for data acquisition of deep-ocean geomagnetic vector components is developed and presented.A seafloor vector magnetometer mainly consists of a fluxgate sensor,data acquisition module,acoustic release module,glass sphere,frame,burn-wire release,and anchor.A new low-noise data acquisition module and a fluxgate sensor greatly reduce power ***,compact size is achieved by integrating an acoustic telemetry module and replacing the acoustic release with an external burn-wire *** new design and magnetometer characteristics reduce the volume of the instrument and the cost of hardware considerably,thereby improving the integrity and deployment efficiency of the ***,it can operate for 90 days underwater at a maximum depth of 6000 *** seafloor vector magnetometer was tested in the South China Sea and the Philippine Sea and obtained high-quality geomagnetic *** deep-water environment facilitates magnetic field data measurements,and the magnetometer has an approximate noise level of 10 pT/rt(Hz)@1 Hz,a peak-to-peak value error of 0.2 nT,and approximate power consumption of 200 *** fluxgate sensor can measure the magnetic field in the lower frequency band and realize geomagnetic field measurements over prolonged periods.

关键词： seafloor vector magnetometer low noise low power consumption

A Study of Professional Managers Incentive Mode and Its Theory in China's Family Business: from the Perspective of “Family” Culture

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当代财经 2013年第S1期 103-111页

作者： XU Xiao-ming YAO kai chen Yang Fudan University Shanghai Maritime University

The impact of Chinese"family"culture is deeply rooted in Chinese family *** kind of culture,which has its origination from the patriarchal relations of Confucian culture,affects the Chinese family business at both positive and negative *** a professional manager,an outsider of the family,joins into the business and tries to help its development with his or her professional skills,the"family"culture may show its negative effects,hindering the role the professional manager should *** is based on such consideration that we try to take the expectancy theory as a starting point and put forward the following suggestions:during the process of introducing professional managers,the private business should take full account of the attitudes and influences of family members into considerations,develop reasonable performance objectives and remuneration package with the professional manager,and achieve the purpose of effectively motivate professional managers to serve the enterprise by safeguarding the psychological contract between them.

关键词： family business "family"culture professional manager incentive

Sub-THz signals' propagation model in hypersonic plasma sheath under different atmospheric conditions

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Science China(Information Sciences) 2017年第11期60卷 242-252页

作者： kai YUAN Yuhao WANG Linfang SHEN ming YAO Xiaohua DENG Fuhui ZHOU Zhou chen Institute of Space Science and Technology Nanchang University Information Engineering School Nanchang University

One of the aims for modern hypersonic cruise flight is hypersonic global reach. The length of route for such flights could be up to thousands of kilometers. The atmospheric conditions on the route are complicated. On the other hand, hypersonic flights used to suffer from communication blackout. The sub-THz communication is considered as a potential solution to the ‘blackout’. In the present study the propagation for sub-THz signals in hypersonic plasma sheaths was modeled under different atmospheric conditions. According to the study, the electron density and the electron collision frequency near the onboard antenna linearly increase with the atmospheric mass density around the vehicle, hence the attenuation of sub-THz signals in hypersonic plasma sheaths increases with the atmospheric mass density. The impact led by the atmospheric temperature is ignorable. Based on the study a new sub-THz signals’ propagation model was developed, which could be utilized for quick estimation for signal propagation under different atmospheric conditions. The geographical difference of signal propagation over the whole globe was obtained with the new model. The results showed that the signal attenuation in plasma sheaths varies with latitude and longitude. The maximum signal attenuation occurs in Alaska, Canada and Russia.

关键词： sub-THz communication hypersonic cruise flight communication blackout plasma sheath signal propagation model signal attenuation

Expression and role of P-element-induced wimpy testis-interacting RNA in diabetic-retinopathy in mice

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World Journal of Diabetes 2021年第7期12卷 1116-1130页

作者： Yong Yu kai-ming Ren Xiao-Long chen Department of Ophthalmology Shengjing Hospital of China Medical UniversityShenyang 110004Liaoning ProvinceChina Department of Thoracic Surgery Shengjing Hospital of China Medical UniversityShenyang 110004Liaoning ProvinceChina

BACKGROUND As one of the major microvascular complications of diabetes,diabetic retinopathy(DR)is the leading cause of blindness in the working age *** the extremely complex pathogenesis of DR has not been fully clarified,the occurrence and development of DR is closely related to tissue ischemia and hypoxia and neovascularization The formation of retinal neovascularization(RNV)has great harm to the visual acuity of *** To investigate the expression of P-element-induced wimpy testis-interacting RNA(piRNA)in proliferative DR mice and select piRNA related to *** One hundred healthy C57BL/6J mice were randomly divided into a normal group as control group(CG)and proliferative DR(PDR)group as experimental group(EG),with 50 mice in each *** were collected from both groups at the same time,and the lesions of mice were evaluated by hematoxylin and eosin staining and retinal blood vessel *** retinal tissues were collected for second-generation high-throughput sequencing,and the differentially expressed piRNA between the CG and EG was detected,and polymerase chain reaction(PCR)was conducted for *** differentially obtained piRNA target genes and expression profiles were enrichment analysis based on gene annotation(Gene Ontology)and Kyoto Encyclopedia of Genes and *** In the CG there was no perfusion area,neovascularization and endothelial nucleus broke through the inner boundary membrane of *** the EG,there were a lot of nonperfused areas,new blood vessels and endothelial nuclei breaking through the inner boundary membrane of the *** was a statistically significant difference in the number of vascular endothelial nuclei breaking through the inner retinal membrane between the two ***-throughput sequencing analysis showed that compared with the CG,a total of 79 piRNAs were differentially expressed in EG,among which 43 piRNAs were up-regulated and 36 piRNAs were ***

关键词： P-element-induced wimpy testis-interacting RNA P-element-induced wimpy testis protein High-throughput sequencing Neovascularization Diabetic retinopathy in mice Bioinformatics

A novel non-iterative shape method for estimating the decay time constant of the finger photoplethysmographic pulse

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第6期12卷 438-445页

作者： Ling-xiao HOU ming WEI Xuan WANG Xin-zhong chen Ying FENG kai JIANG Key Laboratory of Biomedical Engineering of Ministry of Education Department of Biomedical Engineering Zhejiang University'Hangzhou 310027 China Department of Anaesthesia Women "s Hospital Hangzhou 310006 China Institute of Space Medical Engineering Beijing 100094 China

The photoplethysmogram(PPG) of a pulse wave,similar in appearance to the arterial blood pressure(ABP) waveform,contains rich information about the cardiovascular *** decay time constant RC,equal to the product of peripheral resistance R and total arterial compliance C,is a meaningful cardiovascular model parameter in vascular *** or ameliorating the existing ABP methods does not achieve a satisfactory estimation of RC from the PPG volume pulse(VRC).Thus,a novel non-iterative shape method(NSM) of evaluating VRC is introduced in this *** mathematic expression between a novel,readily available morphological parameter called the area difference ratio(ADR) and VRC was *** it was difficult to calculate VRC from the complicated expression analytically,we recommend estimating it using a piecewise linear interpolation ***,since the effect of the PPG magnitude is eliminated in the calculation of ADR,precaliberation or normalization is dispensable in the *** of human experiments indicated that the NSM was computationally efficient,and the simulation experiments confirmed that the NSM was theoretically available for ABP.

关键词： Photoplethysmogram(PPG) Decay time constant Non-iterative shape method(NSM) Area difference ratio(ADR)