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Exploiting multi-channels deep convolutional neural networks for multivariate time series classification

Frontiers of Computer Science 2016年第1期10卷 96-112页

作者： Yi ZHENG QiLIU Enhong CHEN Yong GE j. Leon zhao School of Computer Science and Technology University of Science and Technology of China Hefei 230027 China Department of Computer Science University of North Carolina at Charlotte Charlotte 28223 USA Department of Information Systems City University of Hong Kong Hong Kong China

Time series classification is related to many dif- ferent domains, such as health informatics, finance, and bioinformatics. Due to its broad applications, researchers have developed many algorithms for this kind of tasks, e.g., multivariate time series classification. Among the classifi- cation algorithms, k-nearest neighbor （k-NN） classification （particularly 1-NN） combined with dynamic time warping （DTW） achieves the state of the art performance. The defi- ciency is that when the data set grows large, the time con- sumption of 1-NN with DTW will be very expensive. In con- trast to 1-NN with DTW, it is more efficient but less ef- fective for feature-based classification methods since their performance usually depends on the quality of hand-crafted features. In this paper, we aim to improve the performance of traditional feature-based approaches through the feature learning techniques. Specifically, we propose a novel deep learning framework, multi-channels deep convolutional neu- ral networks （MC-DCNN）, for multivariate time series classi- fication. This model first learns features from individual uni- variate time series in each channel, and combines information from all channels as feature representation at the final layer. Then, the learnt features are applied into a multilayer percep- tron （MLP） for classification. Finally, the extensive experi- ments on real-world data sets show that our model is not only more efficient than the state of the art but also competitive in accuracy. This study implies that feature learning is worth to be investigated for the problem of time series classification.

关键词： convolutional neural networks time series clas-sification feature learning deep learning

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PREPARATION AND CORROSION RESISTANCE OF NiP/TiO_2 COMPOSITE FILM ON CARBON STEEL IN SULFURIC ACID SOLUTION

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Acta Metallurgica Sinica(English Letters) 2006年第2期19卷 117-123页

作者： L.Z. Song S.Z. Song j. zhao School of Environment ＆ Chemical Engineering Yanshan University Qinhuangdao 066004 China School of Materials Science and Engineering Tianjin University Tianjin 300072 China

A NiP/TiO2 composite film on carbon steel was prepared by electroless plating and sol-gel composite process. An artificial neural network was applied to optimize the prepared condition of the composite film. Corrosion behavior of the NiP/TiO2 composite film was investigated by polarization resistance measurement, anode polarization, ESEM （environmental scanning electron microscopy） and EIS （electrochemical impedance spectroscopy） measurements. Results showed that the NiP/ TiO2 composite film has a good corrosion resistance in 0.5mol/L H2SO4 solution. The element valence of the composite film was characterized by XPS （X-ray photoelectron spectroscopy） spectrum, and an anticorrosion mechanism of the composite film was discussed.

关键词： electroless plating and sol-gel composite process artificial neural network NiP/TiO2 composite film corrosion resistance

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MICROSTRUCTURAL MORPHOLOGIES AND MECHANICALBEHAVIORS OF NICKEL-BASE SINGLE CRYSTAL SUPERALLOY CMSX-2 DURING PROLONGED TENSION

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Acta Metallurgica Sinica(English Letters) 1999年第6期12卷 0-0,0-0+0-0+0页

作者： Z.F. Peng Y Y Ren B.Z. Fan j. W Qin P. Yan j. C. zhao Y Q. Wang and j.H. Sun (Wuhan University of Hydraulic and Electric Engineering, Wuhan 430072, China)(Central Iron and Steel Research Institute, Beij.ng 100081, China)

Prolonged tension tcsts were caTried out by comblning elevated temperatures with declined stresses over thc range of 760-1050° C and 780-115MPa. The effects of temperature and applied stress on rupture life, and the relations of temperuture, applied stress and mpture life to characteristic dimensions of coherent phases (γ matrix channel width and mpcd γ precipitate thickness), and to the elongation as well as to the cross sectional area reduction of thc tested specimens were investigated. Under all testing conditions, longittLdinal coalescence of seveml adj.cent armys of γ precipitates could occur to dtherent extents along the direction of the applied stress axis in addition to their normal directional coarsening. The extent of γ Longitudinal coalescence became increased and its morphology tended to be irmpular with the increase of temperuture although the applied stresses were relatively lower.

关键词： superalloy CMSX-2 prolonged tension characteristic-dimension longitudinal coalescence

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TiS2-based saturable absorber for ultrafast fiber lasers

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Photonics Research 2018年第10期6卷 I0046-I0050页

作者： X. ZHU S. CHEN M. ZHANG L. CHEN Q. Wu j. zhao Q．j.ANG Z．ZHENG H．ZHANG School of Electronic and Information Engineering Beihang University Beijing 100191 China Department of Optoelectronics Engineering Shenzhen University Shenzhen 518060 China College of Health Science and Environmental Engineering Shenzhen Technology University Shenzhen 518118 China College of Materials Science and Engineering Shenzhen University Shenzhen 518060 China

We fabricate titanium disulfide(TiS2) using a liquid exfoliation method and subsequently a TiS2-based device by optically depositing the TiS2 material onto the microfiber. This device exhibits a strong nonlinear saturable absorption property with an optical modulation depth of 8.3% at 1560 nm. With the implementation of this all-fiber TiS2-based saturable absorber, we demonstrate that both mode-locking and Q-switching operation can be obtained in a turn-key all-fiber erbium-doped laser cavity. Our findings constitute the first example, to the best of our knowledge, of a TiS2-based saturable absorber for ultrashort pulse generation and highlight the great potential of such devices in two-dimensional nanomaterials-related photonics.

关键词：液体剥离方法激光器通讯技术发展现状

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EFFECT OF SHS PARAMETERS OF Ni0.35Zn0.65Fe2O4 FERRITE ON MAGNETIC PROPERTIES AND ESTABLISHMENT OF MATHEMATICAL MODEL

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Acta Metallurgica Sinica(English Letters) 2000年第2期13卷 821-824页

作者： Y. Li j. P. zhao H. M. Huang j. C. Han and S. Y. Du (Harbin Institute of Technology, Harbin 150001, China)

Ni0.35Zn0.65Fe2O4 ferrite was synthesized by SHS method. In the process of SHS, combustion temperature and velocity were the main process parameters , which were decided by the Fe content, grain size of the ferrite powder, relative density and the oxygen pressure. In this paper the effects of Fe content, grain size and oxygen pressure on combustion temperature and velocity were discussed. The relation between combustion temperature and magnetic permeability was also studied and the method of polynomial regression was used to establish the mathematical model of the relation.

关键词： combustion temperature combustion velocity Fe content relative density,oxygen pressure,mathematical model

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DESIGN AND PROPERTIES OF A FUNCTIONALLY GRADIENT CERAMIC TOOL MATERIAL

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Acta Metallurgica Sinica(English Letters) 1999年第5期12卷 1054-1058页

作者： j. zhao,X. Ai, j.H. Zhang, j.X. Deng and C.Z. Huang Department of Mechanical Engineering, Shandong University of Technology, j.nan 250061,China

Based on the analyses of the severity of cutting process as well as the failure mechanisms of ceramic tools, a model for designing functionally gradient ceramic tool materials with symmetrical distribution is presented, by which a Al 2O 3/(W,Ti)C ceramic tool material FG 2 was developed. Multi obj.ctive optimization method was employed in designing the compositional distribution of this ceramic tool material. The results of both continuous and intermittent cutting tests are indicative of the much better cutting behavior of the functionally gradient ceramic tool FG 2 than that of the common ceramic tool SG 4.

关键词： functionally gradient materials materials design compositional distribution ceramic tool

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j.A is required for arsenic trioxide induced apoptosis in HeLa and MCF-7 cells via reactive oxygen species and mitochondria linked signal pathway

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南京医科大学学报（自然科学版） 2008年第12期28卷 1648-1648页

作者： Zhou, j. H. Ye, j. zhao, X. j. Li, A. P. Zhou, j. W. Nanj.ng Med Univ Inst ToxicalSch Publ HlthDept Mol Cell Biol & ToxicolNanjing 210029Peoples R China

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Genetic Diversity Analysis of Cultured Populations of j.de Perch （Scortum bacoo） in China Using AFLP Markers

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j.urnal of Agricultural Science and Technology 2011年第4期5卷 455-461页

作者： K. C. Chen L. S. Ma Y. Shi j. zhao X. P. Zhu Pearl River Fishery Research Institute Chinese Academic of Fishery Science Guangzhou 510380 China

Genetic diversity of three cultured populations of j.de perch （Scortum bacoo） are studied using amplified fragment length polymorphism （AFLP） markers, which is Guangzhou（GZ） population, Foshan （FS） population and Qingdao（QD） population. Nine primer combinations were used and 385 fragments were detected. Among the 385 fragments, 80 bands （20.78%） were polymorphic. And it can be speculated that the genetic diversity of the three cultured populations of j.de perch was very poor according to the gene genetic diversity among populations （Ht）, the gene genetic diversity within populations （Hs） and Shannon-Weiner index （I）. From gene differentiation （Gst）, genetic distance （D）, genetic similarity （5）, and UPGMA analysis, it is found that the relationship among the three populations is very closed, and the difference in genetic diversity among the three populations is not significant. Further clustering relationships of the j.de perch cultured populations also are correlated to historical-breeding observations and genetic relationships. The GZ population clustered together with the QD population first, then with FS population.

关键词： AFLP Scortum bacoo cultured populations genetic diversity.

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Enhancement of electrical properties in ZnO thin film transistors fabricated by radio frequency magnetron sputtering

Enhancement of electrical properties in ZnO thin film transi...

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第六届国际氧化锌及相关材料研讨会

作者： H. Q. Huang F. j. Liu j. Sun j. W. zhao Z. F. Hu and X. Q. Zhang Key Laboratory of Luminescence and Optical Information Ministry of Education Institute of Opto-electronic Technology Beij.ng j.aotong University Beij.ng 100044 China Key Laboratory of Luminescence and Optical Information Ministry of EducationInstitute of Opto-electronic TechnologyBeijing Jiaotong UniversityBeijing100044China

＜正＞Transparent and flexible electronics are believed to open the next generation of displays. To realize transparent and flexible electronics, the materials used to produce the devices must be insensitivity to light and do not degradation when expose to light;except these, low process temperature is also absolutely necessary. According to the characteristic of

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Fe-Mo-B-CSINTERED STE ELS PRODUCED BY ADDITI ON OF MASTER ALLOY POWDERS

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Acta Metallurgica Sinica(English Letters) 1999年第5期12卷 1198-1201页

作者： Z. M. Xiu1) , L. X. Ding2) , Z. j. zhao3) , j. You3) , Z. Zhang3) , F. M. He1)and X. D. Sun1)1) School of Materials and Metallurgy , Northeastern University , Shenyang 110006 , China2) Department of Materials , School of Mechan

Addition of Fe B C and Fe Mo B C m aster alloy pow ders to Fe Mo B Csintered steels can ac tivate the sintering process by liquid phase sintering . The for m ation of liquid ( α- Fe + ( Fe , Mo... 详细信息

Addition of Fe B C and Fe Mo B C m aster alloy pow ders to Fe Mo B Csintered steels can ac tivate the sintering process by liquid phase sintering . The for m ation of liquid ( α- Fe + ( Fe , Mo) 2 B+ Fe3( B, C) → L) i m proves m echanical properties of the steels , and ultim ate tensilestrengths of 684 774 M Pa , i m pact energy of 47 ±7 j.nd elongation of 2 5 ±0 9 were ob tained . Optim u m a mount of liquid phase exists , and alarge a mount of liquid phase will re sult in the form ation of continuous netw ork of liquid phase that is detrim ental to strength andelongation .

关键词： m aster alloy po w der densification shrinkage

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