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Multi-Exposure Motion Estimation Based on Deep Convolutional Networks

Journal of Computer Science & Technology 2018年第3期33卷 487-501页

作者： Zhi-feng Xie yu-Chen guo Shu-Han zhang Wen-Jun zhang Li-Zhuang Ma Department of Film and Television Engineering Shanghai University Shanghai 200072 China Shanghai Engineering Research Center of Motion Picture Special Effects Shanghai 200072 China Department of Software Science and Technology East China Normal University Shanghai 200062 China

In motion estimation, illumination change is always a troublesome obstacle, which often causes severely per- formance reduction of optical flow computation. The essential reason is that most of estimation methods fail to formalize a unified definition in color or gradient domain for diverse environmental changes. In this paper, we propose a new solution based on deep convolutional networks to solve the key issue. Our idea is to train deep convolutional networks to represent the complex motion features under illumination change, and further predict the final optical flow fields. To this end, we construct a training dataset of multi-exposure image pairs by performing a series of non-linear adjustments in the traditional datasets of *** estimation. Our multi-exposure flow networks （MEFNet） model consists of three main components： low-level feature network, fusion feature network, and motion estimation network. The former two components belong to the contracting part of our model in order to extract and represent the multi-exposure motion features; the third component is the expanding part of our model in order to learn and predict the high-quality optical flow. Compared with many state- of-the-art methods, our motion estimation method can eliminate the obstacle of illumination change and yield optical flow results with competitive accuracy and time efficiency. Moreover, the good performance of our model is also demonstrated in some multi-exposure video applications, like HDR （high dynamic range） composition and flicker removal.

关键词： motion estimation optical flow convolutional neural network multi-exposure

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Identification for temperature model of accelerometer based on proximal SVR and particle swarm optimization algorithms

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控制理论与应用（英文版） 2012年第3期10卷 349-353页

作者： Xiangtao yu Lan zhang Linrui guo feng ZHOU Aerospace Science and Industry Inertial Technology Co. Ltd.Beijing 100074China

The impact of temperature on accelerometer will directly influence the precision of the inertial naviga- tion system （INS）. To eliminate the measurement error of accelerometer, this paper proposes a proximal support vector regression （PSVR） algorithm for generating a linear or nonlinear regression which requires the solution to single system of linear equations. PSVR is used to identify the static temperature model of the accelerometer. In order to improve the identifying performance, the kernel parameters and penalty factors of PSVR are optimized by the canonical particle swarm optimization （CPSO）. The experiments under different temperature conditions were conducted. The experimental results show that the proposed PSVR can correctly identify the static temperature model of quartz flexure accelerometer and is more efficient than those of the standard SVR and least square algorithm.

关键词： Proximal support vector regression Particle swarm optimization System identification Quartz flexureaccelerometer Inertial navigation system

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Assessment of the hazard of extreme low-temperature events over China in 2021

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Advances in Climate Change Research 2022年第6期13卷 811-818页

作者： Ying-Xian zhang guo-fu WANG China Meteorological Administration Climate Studies Key Laboratory Beijing 100081China National Climate Center China Meteorological AdministrationBeijing 100081China

In January 2021,an impressive extreme low-temperature event(ELTE)occurred in China,bringing record-breaking low temperatures to some *** comprehensive hazard and the overall situation of ELTEs in the whole of 2021 are still ***,the overview of ELTEs over the mainland in 2021 and their hazards were systematically reviewed and comprehensively evaluated by using an improved identification and assessment method,which can objectively determine the hazard levels of ELTEs and distinguish spatial differences in the hazard of a single event.A total of 20 ELTEs occurred in 2021;their intensity was remarkably higher than the climatology,while the impacted area and duration were lower than or near the climatology,indicating a normal *** general,the losses of low-temperature related disasters in 2021 were relatively less than the average loss in the past ten years,which is likely related to the low proportion of higher-than-moderately low events in the whole *** in 2021 had large impacts on Northwest,North and Northeast China and small impacts on the southeastern Qinghai-Tibet Plateau and western parts of Southwest *** and autumn had a higher-than-normal hazard index for ELTEs due to two high-hazard events in early-to-mid January and early-to-mid November,*** two high-hazard events showed different spatial *** former mainly affected central and eastern parts of ***,the latter mostly attacked central and western parts of China,especially resulting in high-hazard in parts of Xinjiang.

关键词： Extreme low-temperature events Hazard assessment China

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Tectonic and climatic controls for fluvial terraces of the Yellow River over the past 2.6 Ma at Northeast Tibetan Plateau and Ordos Block

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Journal of Mountain Science 2023年第8期20卷 2164-2180页

作者： guo Xiao-hua FORMAN Steven WANG yuan-yuan zhang yu-feng LIU Xin-yu Qingdao Technical College QingdaoShandong 266555China Department of Geosciences Baylor UniversityOne Bear Place#97354WacoTX 76798USA

The Yellow River is usually assumed to record tectonic activities and climatic changes;however,a systematic study was lack in the sedimentology,stratigraphy,geomorphology and geochronology for the entire Yellow River though various geologic scholars have conducted numerous works in individual *** review focused on well-preserved fluvial terrace sequences that formed along this river on northeastern(NE)Tibetan Plateau and Ordos Block over the past 2.6 *** comparing numerous initial incision ages at different segments along the Yellow River,we found out that the youngest initial incision may occur at ca.150 ka at the Longyang *** Yellow River may transit from multiple separated endorheic drainages to an entire external drainage after 150 ka,which may cause differentiations in the apparent incision rates before and after 150 ka;thus apparent net incision rates were calculated respectively for the Yellow River before 150 ka and the drainage network post 150 *** net incision rates prior to 0.15 Ma were calculated as 0.15,0.29,0.10,0.12 and 0.03 mm/a respectively in Tongde-Xunhua,Lanzhou-Linxia basins,Heishan,Jinshan and Fenwei-Sanmen Gorges in this review,which mainly reflected Kunhuang-Gonghe Tectonic Event,generated by the Indo-Asian collision and diminishing as the NE Tibetan Plateau eastward extruding at ca.1.8-0.15 *** net incision rates post 0.15 Ma were calculated respectively for NE Tibetan Plateau and Ordos Block,considering their different base *** NE Tibetan Plateau,four fluvial degradational phases were identified between ca.105~70,53~40,25~16 and 12~6 ka associated with terrace levels respectively,at average elevations of 96,40,20 and 10.5 meters above the current river level(m arl)within a range of 5~96 m arl;and four broad periods in the last 150 ka on Ordos Block:possibly marine oxygen isotope stage(MIS)5,ca.118 to 72 ka,most of MIS 3,ca.44~28 ka,transition from LGM to last deglacial ca.20 to 16 ka,and 4~3 ka at ave

关键词： Yellow River Fluvial terraces Tibetan Plateau Ordos Block Incision rate

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Value of ^(18)F-FDG PET-CT in surveillance of postoperative colorectal cancer patients with various carcinoembryonic antigen concentrations

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World Journal of Gastroenterology 2014年第21期20卷 6608-6614页

作者： Yan zhang Bin feng guo-Li zhang Man Hu Zheng fu Fen Zhao Xiao-Li zhang Li Kong Jin-Ming yu Graduate school of Tianjin Medical University Department of Radiation Oncology Shandong Tumor Hospital and Institute (Shandong Academy of Medical Sciences) Affiliated Hospital of Shandong Academy of Medical Sciences Jinan 250031Shandong ProvinceChina Department of Nuclear Medicine Shandong Tumor Hospital and Institute (Shandong Academy of Medical Sciences) Medical College Shandong University School of Medicine and Life Sciences University of Jinan

AIM:To evaluate the value of positron emission tomography(PET)/computerized tomography(CT)in surveillance of colorectal cancer(CRC)patients with different carcinoembryonic antigen(CEA)***:One hundred and six postoperative CRC patients who had suspected recurrence or metastasis and received fluorodeoxyglucose(FDG)PET/CT within one week were included in this *** final diagnosis was confirmed by histological examination or clinicalfollow-up over at least six ***:The sensitivity,specificity,and accuracy of FDG PET/CT were 95.2%,82.6%,and 92.5%,and94.8%,81.4%and 92.8%,respectively,in the caseand lesion-based *** sensitivity and accuracy of FDG PET/CT significantly differed from CT in both analyses(χ2=8.186,P=0.004;χ2=6.201,P=0.013;χ2=13.445,P=0.000;χ2=11.194,P=0.001).In the lesion-based analysis,the sensitivity,specificity,and accuracy of FDG PET/CT in the abnormal CEA group were97.8%,82.6%,and 95.6%,compared with 81.3%,80%,and 80.6%for patients with normal CEA *** case-based analysis,the sensitivity,specificity,and accuracy of FDG PET/CT were 97.2%,77.8%,and 95%in abnormal CEA *** in lesion-based analysis,the sensitivity and accuracy of FDG PET/CT in the abnormal CEA group were significantly superior to those in the normal CEA group(χ2=6.432,P=0.011;χ2=7.837,P=0.005).FDG PET/CT changed the management in 45.8%of patients with positive ***:FDG PET/CT showed superior diagnostic value and is an advisable option in surveillance of postoperative CRC patients with a vague diagnosis.

关键词： Colorectal cancer Carcinoembryonic antigen Fluorodeoxyglucose positron emission tomography/computed tomography Recurrence Metastasis

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Coupling dehydrogenation of isobutane in the presence of carbon dioxide over chromium oxide supported on active carbon

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Chinese Chemical Letters 2008年第9期19卷 1059-1062页

作者： Jian Fei Ding zhang feng Qin Xue Kuan Li guo fu Wang Jian guo Wang State Key Laboratory of Coal Conversion Institute of Coal Chemistry Chinese Academy of Sciences P.O. Box 165 Taiyuan 030001 China Graduate School of the Chinese Academy of Sciences Beijing 100049 China

The dehydrogenation of isobutane （IB） to produce isobutene coupled with reverse water gas shift in the presence of carbon dioxide was investigated over the catalyst Cr2O3 supported on active carbon （Cr2O3/AC）. The results illustrated that isobutane conversion and isobutene yield can be enhanced through the reaction coupling in the presence of carbon dioxide. Moreover, carbon dioxide can partially eliminate carbonaceous deposition on the catalyst and keep the active phase （Cr2O3）, which are then helpful to alleviate the catalyst deactivation.

关键词： Dehydrogenation Isobutane Carbon dioxide Isobutene Reaction coupling Cr2O3/AC

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In-situ Immobilization of a Polyoxometalate Metal-Organic Framework(NENU-3)on functionalized Reduced Graphene Oxide for Hydrazine Sensing

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Chinese Journal of Chemistry 2021年第10期39卷 2889-2897页

作者： Cuiyuan Liang Xin Wang Dexin yu Wei guo feng zhang fengyu Qu Key Laboratory of Photochemical Biomaterials and Energy Storage Materials Heilongjiang Province and College of Chemistry and Chemical EngineeringHarbin Normal UniversityHarbinHeilongjiang150025 China Office of Educational Administration Heilongjiang University of Finance and EconomicsHarbinHeilongjiang 150025China

Main observation and conclusion Detection of hydrazine originated from electrochemical media has recently gained considerable attention in the sensing ***,to improve electron transfer capacity,a polyoxometalate metal-organic framework(POMOF,NENU-3)is in-situ nucleated onto the carboxyl functionalized reduced graphene oxide(CFG)(NENU-3/CFG,abbreviation N3/CFG).The N3/CFG supported onto carbon cloth electrodes(CCEs)has been investigated for hydrazine *** amperometric results display that the POMOF/CFG to hydrazine has a broad linear range(0.09—362.5μmol/L)and low detection limit(24 nmol/L).In addition,the POMOF/CFG-based sensors possess good anti-interference capability,boosted stability and ***,when applied to the detection of practical samples,acceptable relative recoveries of 96.26%—107.30%are obtained.

关键词： Metal-organic frameworks functionalized graphene Polyoxometalates Sensors Hydrazine

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Chemoselective Probes Serving as Promising Derivatization Tools in Targeted Metabolomics Research

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Journal of Analysis and Testing 2020年第3期4卷 175-182页

作者： Jie Chen yuan Tian yu-xin zhang feng-guo Xu Key Laboratory of Drug Quality Control and Pharmacovigilance(Ministry of Education) State Key Laboratory of Natural MedicineChina Pharmaceutical UniversityNanjing 210009China Nanjing Drum Tower Hospital The Affiliated Hospital of Nanjing University Medical SchoolNanjing 210008China

Recently,chemoselective probes have gained increasing attention for its superior properties in analyte separation,target compound enrichment,metabolite modification,and *** this regard,the chemoselective probe is showing great potential in targeted metabolomics *** review summarizes the workflow and design of chemoselective *** new development of its applications in the fields of natural product enrichment,metabolite derivatization,as well as potential applications in metabolomics research is *** possible future trends are also prospected.

关键词： Derivatization Enrichment Chemoselective probes Metabolomics

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Biomimetic nanomedicines for precise atherosclerosis theranostics

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Acta Pharmaceutica Sinica B 2023年第11期13卷 4442-4460页

作者： Ying Tao Xinmiao Lan Yang zhang Chenxing fu Lu Liu feng Cao Weisheng guo Department of Minimally Invasive Interventional Radiology Key Laboratory of Molecular Target&Clinical PharmacologySchool of Biomedical Engineering&the Second Affiliated HospitalGuangzhou Medical UniversityGuangzhou 510260China School of Pharmaceutical Sciences Capital Medical UniversityBeijing 100069China Department of Cardiology the Second Medical Center&National Clinical Research Center for Geriatric DiseasesChinese PLA General HospitalBeijing 100853China Department of Cardiology and Laboratory of Heart Center Zhujiang HospitalSouthern Medical UniversityGuangzhou 510280China Department of Pharmacology and Pharmacy Li Ka Shing Faculty of Medicinethe University of Hong KongHong Kong SAR 999077China

Atherosclerosis(AS)is a leading cause of the life-threatening cardiovascular disease(CVD),creating an urgent need for efficient,biocompatible therapeutics for diagnosis and *** nanomedicines(b NMs)are moving closer to fulfilling this need,pushing back the frontier of nano-based drug delivery systems *** review seeks to outline how these nanomedicines(NMs)might work to diagnose and treat atherosclerosis,to trace the trajectory of their development to date and in the coming years,and to provide a foundation for further discussion about atherosclerotic theranostics.

关键词： Nanotheranostics Atherosclerosis Biomimetic nanomedicines Drug delivery Passive targeting Active targeting Plaques Diagnosis and treatment

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Preparation of biomimetic gene hydrogel via polymerase chain reaction for cell-free protein expression

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Science China Chemistry 2020年第1期63卷 99-106页

作者： feng Li Wenting yu Xue zhang Xiaocui guo Xihan Xu Xiaolei Sun Dayong Yang Frontier Science Center for Synthetic Biology Key Laboratory of Systems Bioengineering (Ministry of Education) School of Chemical Engineering and Technology Tianjin University

Deoxyribonucleic acid(DNA)hydrogels,a three-dimensional(3 D)network made from DNA chains,have attracted great attention because of its molecular programmability,excellent biocompatibility and wide biomedical *** of hydrogel incorporating genetic function is still a challenge because of the limitations in available preparation ***,we develop a polymerase chain reaction(PCR)based strategy to construct gene integrated hydrogel to mimic the biofunction of nucleus *** primers were chemically modified by methacrylamide,which were used as modular primers in PCR to hybridize with template plasmid DNA,yielding methacrylamide functionalized gene(Acry-gene).Afterwards,Acry-gene was chemically cross-linked and compressed via free radical polymerization of terminal group methacrylamide to form a threedimensional gene network,namely gene *** gene hydrogel retained the genetic function and expressed protein successfully in a cell free protein expression *** work provides a general approach for the construction of biofunctional gene hydrogel which mimics bioprocesses,showing great potential in biomedicine and biomimetic fields.

关键词： hydrogel DNA polymerase chain reaction free radical polymerization biomimetic materials

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