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Low complexity reconfigurable architecture for the 5/3 and 9/7 discrete wavelet transform

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Journal of Systems Engineering and Electronics 2006年第2期17卷 303-308页

作者： Xiong cheng yi tian Jinwen Liu Jian Coll. of Electronic Information Engineering South Center Univ. for Nationalities Wuhan 430074 P.R. China Inst. of Pattern Recognition & Artificial Intelligence Key Lab. of Education Ministry for Image Processing and Intelligent Control Huazhong Univ. of Science & Technology Wuhan 430074 P.R. China

Efficient reconfigurable VLSI architecture for 1-D 5/3 and 9/7 wavelet transforms adopted in JPEG2000 proposal, based on lifting scheme is proposed. The embedded decimation technique based on fold and time multiplexing, as well as embedded boundary data extension technique, is adopted to optimize the design of the architecture. These reduce significantly the required numbers of the multipliers, adders and registers, as well as the amount of accessing external memory, and lead to decrease efficiently the hardware cost and power consumption of the design. The architecture is designed to generate an output per clock cycle, and the detailed component and the approximation of the input signal are available alternately. Experimental simulation and comparison results are presented, which demonstrate that the proposed architecture has lower hardware complexity, thus it is adapted for embedded applications. The presented architecture is simple, regular and scalable, and well suited for VLSI implementation.

关键词： VLSI discrete wavelet transform lifting scheme embedded decimation reeonfigurable.

Additional symmetries of constrained CKP and BKP hierarchies

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Science China Mathematics 2011年第2期54卷 257-268页

作者： tian KeLei HE JingSong cheng JiPeng cheng Yi Department of Mathematics University of Science and Technology of China Hefei 230026 China Department of Mathematics Ningbo University Ningbo 315211 China

The additional symmetries of the constrained CKP (cCKP) and BKP (cBKP) hierarchies are given by their actions on the Lax operators, and their actions on the eigenfunction and adjoint eigenfunction {Φ i , Ψ i } are presented explicitly. Furthermore, we show that acting on the space of the wave operator, *k forms new centerless W cC 1+∞ and W cB 1+∞ -subalgebra of centerless W 1+∞ respectively. In order to define above symmetry flows *k of the cCKP and cBKP hierarchies, two vital operators Y k are introduced to revise the additional symmetry flows of the CKP and BKP hierarchies.

关键词： constrained CKP hierarchy constrained BKP hierarchy additional symmetry

Design and optimization of diffraction-limited storage ring lattices based on many-objective evolutionary algorithms

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Nuclear Science and Techniques 2023年第10期34卷 20-35页

作者： He-xing Yin Jia-Bao Guan Shun-Qiang tian Ji-Ke Wang The Institute for Advanced Studies Wuhan UniversityWuhan 430072China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China

Multi-objective evolutionary algorithms(MOEAs) are typically used to optimize two or three objectives in the accelerator field and perform well. However, the performance of these algorithms may severely deteriorate when the optimization objectives for an accelerator are equal to or greater than four. Recently, many-objective evolutionary algorithms(MaOEAs)that can solve problems with four or more optimization objectives have received extensive attention. In this study, two diffraction-limited storage ring(DLSR) lattices of the Extremely Brilliant Source(ESRF-EBS) type with different energies were designed and optimized using three MaOEAs and a widely used MOEA. The initial population was found to have a significant impact on the performance of the algorithms and was carefully studied. The performances of the four algorithms were compared, and the results demonstrated that the grid-based evolutionary algorithm(GrEA) had the best *** OEAs were applied in many-objective optimization of DLSR lattices for the first time, and lattices with natural emittances of 116 and 23 pm·rad were obtained at energies of 2 and 6 GeV, respectively, both with reasonable dynamic aperture and local momentum aperture(LMA). This work provides a valuable reference for future many-objective optimization of DLSRs.

关键词： Storage ring lattices Many-objective evolutionary algorithms GrEA algorithm NSGA

A Novel Early Warning Model for Hand, Foot and Mouth Disease Prediction Based on a Graph Convolutional Network

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Biomedical and Environmental Sciences 2022年第6期35卷 494-503页

作者： JI tian Jiao cheng Qiang ZHANG Yong ZENG Han Ri WANG Jian xing YANG Guan Yu XU Wen Bo LIU Hong Tu NHC Key Laboratory of Medical Virology and Viral Diseases National Institute for Viral Disease Control and PreventionChinese Center for Disease Control and PreventionBeijing 100026China Academy of Cyber Science and Engineering Southeast UniversityNanjing 211189JiangsuChina Center for Biosafety Mega Science Chinese Academy of SciencesWuhan 430071HubeiChina Guangdong Center for Disease Control and Prevention Guangzhou 511430GuangdongChina Shandong Center for Disease Control and Prevention Jinan 250014ShandongChina LIST Key Laboratory of Computer Network and Information Integration(Southeast University)Ministry of EducationSoutheast UniversityNanjing 211189JiangsuChina

Objectives Hand,foot and mouth disease(HFMD)is a widespread infectious disease that causes a significant disease burden on *** achieve early intervention and to prevent outbreaks of disease,we propose a novel warning model that can accurately predict the incidence of *** We propose a spatial-temporal graph convolutional network(STGCN)that combines spatial factors for surrounding cities with historical incidence over a certain time period to predict the future occurrence of HFMD in Guangdong and Shandong between 2011 and *** 2011-2018 data served as the training and verification set,while data from 2019 served as the prediction *** important parameters were selected and verified in this model and the deviation was displayed by the root mean square error and the mean absolute *** As the first application using a STGCN for disease forecasting,we succeeded in accurately predicting the incidence of HFMD over a 12-week period at the prefecture level,especially for cities of significant *** This model provides a novel approach for infectious disease prediction and may help health administrative departments implement effective control measures up to 3 months in advance,which may significantly reduce the morbidity associated with HFMD in the future.

关键词： HFMD Early warning model STGCN Disease prediction

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降解氨基甲酸乙酯的酯酶挖掘及酶学性质表征

食品科学 2025年第2期46卷 99-107页

作者：刘庆涛朱司宝王天文李闯钱森和张温清程凡田淑芳安徽工程大学生物与食品工程学院安徽芜湖241000 芜湖市绿色食品产业研究院有限公司安徽芜湖241000 安徽宣酒集团股份有限公司研发中心安徽宣城242000

本研究在NCBI数据库中挖掘出4个在pH 4.5及7.0条件下均具有氨基甲酸乙酯(ethyl carbamate,EC)降解能力的酯酶(ES1、ES5、ES8和ES9),实现它们在大肠杆菌中的可溶性表达,并对其进行纯化及酶学性质表征。结果表明,ES1、ES5、ES8和ES9最适... 详细信息

本研究在NCBI数据库中挖掘出4个在pH 4.5及7.0条件下均具有氨基甲酸乙酯(ethyl carbamate,EC)降解能力的酯酶(ES1、ES5、ES8和ES9),实现它们在大肠杆菌中的可溶性表达,并对其进行纯化及酶学性质表征。结果表明,ES1、ES5、ES8和ES9最适温度分别为70、70、55℃及55℃,ES1、ES5、ES9最适pH值呈碱性,ES8呈中性;4种酶在温度高于45℃或pH值低于5.0条件下稳定性显著降低;4种酶的活性受到Fe^(3+)、Co^(2+)、Cu^(2+)的强烈抑制;4种酶在体积分数10%乙醇存在条件下,可分别保持50.48%、48.44%、42.60%及33.59%的酶活力。4种酶在质量分数为5%NaCl条件下,可分别保持24.09%、20.41%、16.11%及10.73%的酶活力。4种酶在pH 4.5条件下对EC的米氏常数(Km)值分别为210.7、213.8、256.2 mmol/L及127.2 mmol/L,催化常数(kcat)/米氏常数(Km)值分别为214.31、203.20、161.46 L/(mol·s)及257.43 L/(mol·s)。结构分析推测,ES9底物通道入口较窄,可能影响EC的进入,从而影响ES9对EC的最大反应速率;而ES9具有相对较高的EC亲和力,可能归因于ES9与EC之间较强的氢键作用力。本研究获得了具有良好乙醇耐受性及EC水解性能的酯酶,丰富了EC水解酶酶库,为未来控制低酒精度的传统发酵食品中EC含量提供了新方法。

关键词：氨基甲酸乙酯氨基甲酸乙酯水解酶酯酶传统发酵食品食品安全

Preparation of rare-earth-modified medical stone powders and their application as conductive fillers

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International Journal of Minerals,Metallurgy and Materials 2019年第2期26卷 260-266页

作者： Li-ying Qi Su-e Hao tian-cheng Sun School of Chemistry and Chemical Engineering Harbin Institute of Technology

Traditional metal conductive fillers are expensive and prone to oxidation. Thus, the development of new conductive powders as fillers is urgently needed. A novel gaseous penetration technology was adopted to prepare La-doped medical stone powders(La-MSPs), which are inexpensive mesoporous materials, as a new kind of conductive filler material. The prepared La-MSPs attained a resistivity of 450 ?·m and were used as a filler to prepare conductive coatings with epoxy resin as the resin matrix. The influence of the La-MSPs dosage on the resistance and hardness of the coatings was also determined. The resistance and the hardness both decreased with increasing filler dosage. Finally, the optimum recipe of the conductive coatings with the most suitable fillers dosage(55 wt%) was obtained. The hardness and resistance of the coatings with 55 wt% La-MSPs were HV 4 and 5.5 × 10~7 ?, respectively.

关键词： chemical engineering conductive materials rare earths medical stone powders gaseous penetration technology

Interannual variability in the barrier layer and forcing mechanism in the eastern equatorial Indian Ocean and Bay of Bengal

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Acta Oceanologica Sinica 2020年第7期39卷 19-31页

作者： tian Ma Xuhua cheng Yiquan Qi Jiajia Chen Key Laboratory of Marine Hazards Forecasting Ministry of Natural ResourcesHohai UniversityNanjing 210098China College of Oceanography Hohai UniversityNanjing 210098China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519000China

Interannual variability(IAV)in the barrier layer thickness(BLT)and forcing mechanisms in the eastern equatorial Indian Ocean(EEIO)and Bay of Bengal(BoB)are examined using monthly Argo data sets during 2002–*** BLT during November–January(NDJ)in the EEIO shows strong IAV,which is associated with the Indian Ocean dipole mode(IOD),with the IOD leading the BLT by two *** the negative IOD phase,the westerly wind anomalies driving the downwelling Kelvin waves increase the isothermal layer depth(ILD).Moreover,the variability in the mixed layer depth(MLD)is *** by the Wyrtki jet,the MLD presents negative anomalies west of 85°E and strong positive anomalies between 85°E and 93°***,the BLT shows positive anomalies except between 86°E and 92°E in the ***,the IAV in the BLT during December–February(DJF)in the BoB is also *** the eastern and northeastern BoB,the IAV in the BLT is remotely forced by equatorial zonal wind stress anomalies associated with the El Ni?o-Southern Oscillation(ENSO).In the western BoB,the regional surface wind forcing-related ENSO modulates the BLT variations.

关键词： barrier layer thickness interannual variability eastern equatorial Indian Ocean Bay of Bengal

Feasibility study of inclined geosynchronous SAR focusing using Beidou IGSO signals

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Science China Earth Sciences 2016年第12期59卷 240-242页

作者： Xichao DONG cheng HU Weiming tian tian ZHANG Yuanhao LI Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology

Dear editor,Geosynchronous synthetic aperture radar(GEO SAR)[1,2]has an inclined geosynchronous orbit of around 36000 km,which leads to its short revisit time of around 24 hours and a wide coverage of up to approximately one third of the Earth *** long integration time guarantees the fine ***,GEO SAR owns the promising capability of providing images with the high resolution,

关键词：倾斜地球同步轨道 SAR 北斗聚焦信号

Iceberg calving from the Antarctic Nansen Ice Shelf in April 2016 and its local impact

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Science Bulletin 2016年第15期61卷 1157-1159页

作者： tian Li Yifan Ding tiancheng Zhao Xiao cheng State Key Laboratory of Remote Sensing Science College of Global Change and Earth System ScienceBeijing Normal UniversityBeijing 100875China Joint Center for Global Change Studies Beijing 100875China

Owing to global warming,frequent ice shelf disintegration and rapid acceleration of inland ice flow have occurred in recent decades,which impacts the Antarctic mass balance and the global sea level[1].These events are closely linked to atmospheric and oceanic *** prolonged melt season and larger extent of melt ponds on the ice shelf surface[2],as well as enhanced basal melting caused by warmer sea water[3],will induce crevasses that

关键词：冰架南极冰山海洋环境全球变暖质量平衡浮游植物科学探险