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Adaptive mixture observation models for multiple object tracking

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Science in China(Series F) 2009年第2期52卷 226-235页

作者： CUI Peng SUN lifeng yang ShiQiang Department of Computer Science Tsinghua University Beijing 10084 China

Multiple object tracking （MOT） poses many difficulties to conventional well-studied single object tracking （SOT） algorithms, such as severe expansion of configuration space, high complexity of motion conditions, and visual ambiguities among nearby targets, among which the visual ambiguity problem is the central challenge. In this paper, we address this problem by embedding adaptive mixture observation models （AMOM） into a mixture tracker which is implemented in Particle Filter framework. In AMOM, the extracted multiple features for appearance description are combined according to their discriminative power between ambiguity prone objects, where the discriminability of features are evaluated by online entropy-based feature selection techniques. The induction of AMOM can help to surmount the incapability of conventional mixture tracker in handling object occlusions, and meanwhile retain its merits of flexibility and high efficiency. The final experiments show significant improvement in MOT scenarios compared with other methods.

关键词： motion tracking mixture tracker particle filter online feature selection

Generative Adversarial Network-Based Electromagnetic Signal Classification: A Semi- Supervised Learning Framework

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China Communications 2020年第10期17卷 157-169页

作者： Huaji Zhou Licheng Jiao Shilian Zheng lifeng yang Weiguo Shen Xiaoniu yang Key Laboratory of Intelligent Perception and Image Understanding of Ministry of Education School of Artificial IntelligenceXidian UniversityXi'an 710071China Science and Technology on Communication Information Security Control Laboratory Jiaxing 314033China

Generative adversarial network(GAN)has achieved great success in many fields such as computer vision,speech processing,and natural language processing,because of its powerful capabilities for generating realistic *** this paper,we introduce GAN into the field of electromagnetic signal classification(ESC).ESC plays an important role in both military and civilian ***,in many specific scenarios,we can’t obtain enough labeled data,which cause failure of deep learning methods because they are easy to fall into ***,semi-supervised learning(SSL)can leverage the large amount of unlabeled data to enhance the classification performance of classifiers,especially in scenarios with limited amount of labeled *** present an SSL framework by incorporating GAN,which can directly process the raw in-phase and quadrature(IQ)signal *** to the characteristics of the electromagnetic signal,we propose a weighted loss function,leading to an effective classifier to realize the end-to-end classification of the electromagnetic *** validate the proposed method on both public RML2016.04c dataset and real-world Aircraft Communications Addressing and Reporting System(ACARS)signal *** experimental results show that the proposed framework obtains a significant increase in classification accuracy compared with the state-of-the-art studies.

关键词： generative adversarial network semi-supervised learning electromagnetic signal classification end-to-end classification weighted loss function

Non-Cooperative Differential Game Based Energy Consumption Control for Dynamic Demand Response in Smart Grid

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China Communications 2019年第8期16卷 107-114页

作者： Manxi Wang Haitao Xu Shengsong yang lifeng yang Ruifeng Duan Xianwei Zhou State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System Luoyang 471003China School of Computer and Communication Engineering University of Science and Technology BeijingBeijing 100083China

In this paper, we conduct research on the dynamic demand response problem in smart grid to control the energy consumption. The objective of the energy consumption control is constructed based on differential game, as the dynamic of each users’ energy state in smart gird can be described based on a differential equation. Concept of electricity sharing is introduced to achieve load shift of main users from the high price hours to the low price hours. Nash equilibrium is given based on the Hamilton equation and the effectiveness of the proposed model is verified based on the numerical simulation results.

关键词： energy consumption dynamic demand response smart grid differential game nash equilibrium

Adaptive data-driven parallelization of multi-view video coding on multi-core processor

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Science in China(Series F) 2009年第2期52卷 195-205页

作者： PANG Yi HU WeiDong SUN lifeng yang ShiQiang Department of Computer Science and Technology Tsinghua University Beijing 100084 China

Multi-view video coding （MVC） comprises rich 3D information and is widely used in new visual media, such as 3DTV and free viewpoint TV （FTV）. However, even with mainstream computer manufacturers migrating to multi-core processors, the huge computational requirement of MVC currently prohibits its wide use in consumer markets. In this paper, we demonstrate the design and implementation of the first parallel MVC system on Cell Broadband Engine^TM processor which is a state-of-the-art multi-core processor. We propose a task-dispatching algorithm which is adaptive data-driven on the frame level for MVC, and implement a parallel multi-view video decoder with modified H.264/AVC codec on real machine. This approach provides scalable speedup （up to 16 times on sixteen cores） through proper local store management, utilization of code locality and SIMD improvement. Decoding speed, speedup and utilization rate of cores are expressed in experimental results.

关键词： adaptive data-driven multi-view video coding Cell Broadband Engine^TM Processor parallelization

Improved the biocompatibility of cancellous bone with compound physicochemical decellularization process

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Regenerative Biomaterials 2020年第5期7卷 443-451页

作者： You Ling Weikang Xu lifeng yang Changyan Liang Bin Xu National Engineering Research Center for Human Tissue Restoration and Function Reconstruction School of Materials Science and EngineeringSouth China University of TechnologyGuangzhou Higher Education Mega CentrePanyu DistrictGuangzhouGuangdong 510006China Department of Scientific Research National Engineering Research Center for Healthcare DevicesGuangdong Key Lab of Medical Electronic Instruments and Polymer Material ProductsGuangdong Institute of Medical InstrumentsGuangdong Academy of SciencesNo.1307 Guangzhou Avenue CentralTianhe DistrictGuangzhouGuangdong 510500China National Engineering Laboratory for Regenerative Implantable Medical Devices R&D CenterGrandhope Biotech Co.LtdGuangzhouGuangdong 510530China Department of Biosecurity Evaluation Guangdong Medical Devices Quality Surveillance and Test InstituteNo.1 Guangpu West RoadHuangpu DistrictGuangzhouGuangdong 510663China Department of Gynecology Third Affiliated Hospital of Sun Yat-sen UniversityNo.600 Tianhe RoadTianhe DistrictGuangzhou 510630China

Due to the unique microstructures and components of extracellular matrix(ECM),decellularized scaffolds had been used widely in *** reaction of the host toward decellularized scaffolds depends on their biocompatibility,which should be satisfied before applied in *** aim of this study is to develop a decellularized xenograft material with good biocompatibility for further bone repair,in an effective and gentle *** existing chemical and physical decellularization techniques including ethylene diamine tetraacetic acid(EDTA),sodium dodecyl sulfate(SDS)and supercritical carbon dioxide(SC-CO2)were combined and modified to decellularize bovine cancellous bone(CB).After decellularization,almost 100%of A-Gal epitopes were removed,the combination of collagen,calcium and phosphate was *** direct and indirect contact with macrophages was used to evaluate the cytotoxicity and immunological response of the *** stem cells(MSCs)were used in the in vitro cells’proliferation *** decellularized CB was proved has no cytotoxicity(grade 1)and no immunological response(NO,IL-2,IL-6 and TNF-α secretion inhibited),and could support MSCs proliferated *** results were similar to that of commercial decellularized human *** study suggests the potential of using this kind of combine decellularization process to fabricate heterogeneous ECM scaffolds for clinical application.

关键词： extracellular matrix cancellous bone physicochemical decellularization biocompatibility

A study on solid density primary standard

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Chinese Science Bulletin 2007年第21期52卷 2881-2886页

作者： LUO ZhiYong yang lifeng GU YingZi GUO LiGong DING JinGan National Institute of Metrology Beijing 100013 China

The accuracy of solid density primary standard is decided mainly by the accuracy of the diameter measurement of silicon sphere. With traditional five-interferogram algorithm to unwrap phase for di- ameter measurement, the phase steps should be equal to π/2 exactly, but this is almost impossible to achieve in nanometer positioning technique. In order to overcome this defect, we have derived an im- proved five-interferogram algorithm, which not only keeps the high accuracy of traditional five-inter- ferogram algorithm, but also does not require absolute equal step to unwrap phase. Instead, the im- proved five-interferogram algorithm only needs measuring phase shifting. Based on the improved al- gorithm, we have developed a novel interferometer with special etalon, and the cavity length of this etalon can be changed by pressure from vertical direction to realize phase shifting. The accuracy of this interferometer is better than 3 nm and can be improved in future research.

关键词：固体密度衡量标准标准具算法

Remarkable separation of C 5 olefins in anion-pillared hybrid porous materials

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Nano Research 2021年第2期14卷 541-545页

作者： Ying Yu lifeng yang Bin Tan Jianbo Hu Qingju Wang Xili Cui Huabin Xing Key Laboratory of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027China Institute of Zhejiang University-Quzhou Quzhou 324000China Ningxia Coal Industry Co. LtdCHN EnergyShizuishan 753200China

C5 olefin separation is of great importance and challenge in industry with the increasing demand for synthetic ***,the related study is limited due to the complex compositions and the similar boiling ***,we for the first time employ two anionpillared hybrid porous materials(ZU-62 and TIFSIX-2-Cu-i)towards the challenging separation of C5 olefin mixtures(trans-2-pentene,1-pentene and isoprene).These two adsorbents not only exhibit the unprecedented separation performance,but also show excellent recycle *** to the favorable electrostatic environment within a suitable confined space,TIFSIX-2-Cu-i is able to distinguish the three C5 olefins(frans-2-pentene,1-pentene and isoprene)with a high uptake of trans-2-pentene(3.1mmgol·g^(-1))ZU-62(also termed as NbOFFIVE-2-Cu-i)with contracted aperture size shows exclusion effect to the relatively large molecule of isoprene at low pressure range(0-6 kPa),contributing to the excellent separation selectivity of 1-pentene/isoprene(300).The excellent separation performance of ZU-62 and TIFSIX-2-Cu-i is verified by the breakthrough *** interestingly,the regeneration tests show that C5 olefins can be easily desorbed from ZU-62,TIFSIX-2-Cu-i under 298 ***,the detailed adsorption behavior is further revealed by simulation studies.

关键词： C5 olefin separation metal-organic frameworks adsorption

Boosting kinetic separation of ethylene and ethane on microporous materials via crystal size control

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Chinese Journal of Chemical Engineering 2024年第1期65卷 85-91页

作者： Yixuan Ma Cong Yu lifeng yang Rimin You Yawen Bo Qihan Gong Huabin Xing Xili Cui Key Laboratory of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310012China Fundamental Science&Advanced Technology Lab PetroChina Petrochemical Research InstituteChina National Petroleum CorporationBeijing 102200China ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang UniversityHangzhou 311200China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Hangzhou 310027China

The adsorptive separation of C_(2)H_(4)and C_(2)H_(6),as an alternative to distillation units consuming high energy,is a promising yet challenging *** great similarity in the molecular size of C_(2)H_(4)and C_(2)H_(6)brings challenges to the regulation of adsorbents to realize efficient dynamic ***,we reported the enhancement of the kinetic separation of C_(2)H_(4)/C_(2)H_(6)by controlling the crystal size of ZnAtzPO_(4)(Atz=3-amino-1,2,4-triazole)to amplify the diffusion difference of C_(2)H_(4)and C_(2)H_(6).Through adjusting the synthesis temperature,reactant concentration,and ligands/metal ions molar ratio,ZnAtzPO4 crystals with different sizes were *** single-component kinetic adsorption tests and binary-component dynamic breakthrough experiments confirmed the enhancement of the dynamic separation of C_(2)H_(4)/C_(2)H_(6)with the increase in the crystal size of ZnAtzPO_(4).The separation selectivity of C_(2)H_(4)/C_(2)H_(6)increased from 1.3 to 98.5 with the increase in the crystal size of ZnAtzPO_(4).This work demonstrated the role of morphology and size control of adsorbent crystals in the improvement of the C_(2)H_(4)/C_(2)H_(6)kinetic separation performance.

关键词： Adsorption Adsorbent Ethylene Binary mixture Crystal size control Kinetic separation

Evaluating the fractionation of ion-adsorption rare earths for in-situ leaching and metallogenic mechanism

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Journal of Rare Earths 2018年第12期36卷 1333-1341页

作者： Qiuhua Xu lifeng yang Dashan Wang Xiao Hou Yuanyuan Sun Xuezhen Zhou Xinmu Zhou Yongxiu Li Research Center for Rare Earths Micro/Nano-Functional Materials Nanchang University College of Environmental and Chemical Engineering Nanchang Hangkong University

The fractionation of ion adsorption rare earths(IAREs) along the depth in a shaft of a deposit at Dajishan,Jiangxi, China was comparatively evaluated using the partition values(PVs) and relative fractionation values(RFVs) of the leached rare earths(REs). It is found that both PVs and RFVs can objectively reflect the migration and fractionation of REs, but RE content and abrasion pH could not. However, the RFVs can provide more information to quantitatively evaluating the migration and fractionation characteristics of REs along the selected direction and region than PVs could, which is of significance for designing the optimal procedures of in-situ leaching based on the determined flow direction of injecting solution. It is demonstrated that the migration of Ce, Pr, and Nd along the depth direction is inert, and that of REs post Sm and Y is active. Meanwhile, the migration of La shows region characteristics which is active in the upper and inert in lower region. More interesting, the dependence of RFVs on atomic number of REs displays a tetrad group variation trend. However, the fractionation of REs among clay minerals with different particle sizes is not evident, especially for the clay in the bottom region. These results indicate that the migration and fractionation of REs not only are dominated by the adsorption of their hydrated ions, but also rely on their hydrolysis tendency, which provide information for understanding the metallogenic mechanism of IAREs.

关键词： Ion-adsorption rare earth In-situ leaching Fractionation Metallogenic