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Gaze estimation in a gaze tracking system

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science{1.(Information sciences) 2011年第11期54卷 2295-2306页

作者： zhang Chuang,CHI JianNan,zhang ZhaoHui,GAO XiaoLiang,HU Tao & {2. ZhiLiang school of Information Engineering,university of science and technology Beijing,Beijing 1.0083,china 1. school of Information Engineering University of Science and Technology Beijing Beijing 100083 China

This article presents a gaze estimation method (GEMHSSO) based on the pupil center cornea reflection (PCCR) *** PCCR systems suffer from several problems,including the restriction of users’ head movement,and the requirement of individual *** paper presents a head position compensation model using a single camera and a single light source,which realizes the analytic compensation of head motion effects on pupil-glint *** then present a transformation model for individual differences to simplify the calibration process to a one-point *** this basis,we establish a novel gaze estimation method that reduces the minimum hardware requirements for accurate estimation to a single camera (not calibrated) and a single light *** the need for a complex system,our method has the ability to estimate gaze during natural head movement,and to substantially simplify user *** step of the proposed method in this paper makes real-time implementation possible,which provides an effective solution for eye-gaze tracking in human-computer interaction systems.

关键词： gaze tracking gaze estimation pupil center cornea reflection (PCCR) head compensation individual calibration

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基于一种最优核鉴别矢量集的雷达目标识别

系统仿真学报 2008年第20期20卷 5506-5510,5515页

作者：赵峰张军英刘敬山东工商学院计算机学院山东烟台264005 西安电子科技大学计算机学院陕西西安710071

基于高分辨距离像的雷达目标识别的关键是如何提取距离像的有效鉴别特征。通过分析核Fisher准则函数下核类内散布矩阵的零空间信息与非零空间信息对识别的贡献,基于同构映射思想,求解出一组最优鉴别矢量集,用于提取距离像的鉴别特征。同... 详细信息

基于高分辨距离像的雷达目标识别的关键是如何提取距离像的有效鉴别特征。通过分析核Fisher准则函数下核类内散布矩阵的零空间信息与非零空间信息对识别的贡献,基于同构映射思想,求解出一组最优鉴别矢量集,用于提取距离像的鉴别特征。同时,给出一种快速算法,用较少的训练样本表达投影方向,加快了鉴别特征的提取速度。基于外场实测数据的实验证明了方法的有效性。

关键词：高分辨距离像最优鉴别矢量集核Fisher判别分析核函数

Genetic Optimization Algorithm of PID Decoupling Control for VAV Air-Conditioning System

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Transactions of Tianjin university 2009年第4期15卷 308-314页

作者：王江江安大伟张春发荆有印 school of Energy and Power Engineering North China Electric Power University school of Environment {1. and Engineering Tianjin University

Variable-air-volume (VAV) air-conditioning system is a multi-variable system and has multi coupling control loops. While all of the control loops are working together, they interfere and influence each other. A multivariable decoupling PID controller is designed for VAV air-conditioning system. Diagonal matrix decoupling method is employed to eliminate the coupling between the loop of supply air temperature and that of thermal-space air temperature. The PID controller parameters are optimized by means of an improved genetic algorithm in floating point representations to obtain better performance. The population in the improved genetic algorithm mutates before crossover, which is helpful for the convergence. Additionally the micro mutation algorithm is proposed and applied to improve the convergence during the later evolution. To search the best parameters, the optimized parameters ranges should be amplified 1. times the initial ideal parameters. The simulation and experiment results show that the decoupling control system is effective and feasible. The method can overcome the strong coupling feature of the system and has shorter governing time and less over-shoot than non-optimization PID control.

关键词： genetic algorithm decoupling control PID control variable air volume air-conditioning system

Non-isothermal decomposition kinetics and lifetime of Tb2.0-MBA)6(PHEN)2

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Rare Metals 2003年第3期22卷 155-159页

作者： zhangJianjun BAIJihai {1.Ruifen {1.Shuping LIJibiao ExperimentalCenter NormalUniversityShijiazhuang050016China Departmentofcomputer HebeiNormalCollegeofScienceandTechnologyChangli066600China DepartmentofChemistry HebeiNormalUniversityShijiazhuang050091China

The thermal decomposition of Tb_2.O-MBA)_6(PHEN)_2.(O-MBA: o-methylbenzoate;PHEN: 1.1.-phenanthroline) and its kinetics were studied under the non-isothermal condition bythermogravimetry-derivative thermogravimetry (TG-DTG) techniques. Kinetic parameters were obtainedfrom analysis of TG-DTG curves by the Achar method and the Madhusudanan-Krishnan-Ninan (MKN) *** most probable mechanism function was suggested by comparing the kinetic parameters. The kineticequation for the first stage can be expressed as dα/dt = Aexp(-E/RT)·3(1.- α)^(2.3). Thelifetime equation at mass loss of 1.% was deduced as lnτ= -2..742. + 1.797.795/T by isothermalthermogravimetric analysis.

关键词： thermochimica non-isothermal kinetics TG-DTG terbium complex O-methylbenzoate 1.1.-phenanthroline

Formatted PVDF in lamellar composite solid electrolyte for solidstate lithium metal battery

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Nano Research 2024年第6期17卷 5159-5167页

作者： Xinji zhang Yafang zhang Shiyue Zhou Jingchuan Dang Chenye {2. Wenjia Wu Jingtao {2. school of Chemical Engineering Zhengzhou UniversityZhengzhou 450001China

Solid polymer electrolytes(SPEs)hold great application potential for solid-state lithium metal battery because of the excellent interfacial contact and processibility,but being hampered by the poor room-temperature conductivity(~1.^(−7)S·cm^(−1.)and low lithium-ion transference number(tLi+).Here,a lamellar composite solid electrolyte(Vr-NH_(2.@polyvinylidene fluoride(PVDF)LCSE)withβ-conformation PVDF is fabricated by confining PVDF in the interlayer channel of-NH_(2.modified vermiculite lamellar *** demonstrate that the conformation of PVDF can be manipulated by the nanoconfinement effect and the interaction from channel *** presence of-NH_(2.groups could induce the formation ofβ-conformation PVDF through electrostatic interaction,which serves as continuous and rapid lithium-ion transfer *** a result,a high room-temperature ionic conductivity of 1.77×1.^(−4)S·cm^(−1.is achieved,1.2.orders of magnitude higher than most ***,Vr-NH_(2.@PVDF LCSE shows a high tLi+of 0.68 because of the high dielectric constant,~3 times of that of PVDF SPE,and surpassing most of reported *** LiNi_(0.8)Co_(0.1.Mn_(0.1.O_(2.||Li cell assembled by Vr-NH_(2.@PVDF LCSE obtains a discharge specific capacity of 1.7.1.mAh·g^(−1.after 1.0 cycles with a capacity retention rate of 93%at 1.C and 2.℃.This study may pave a new avenue for high-performance SPEs.

关键词： solid-state lithium metal battery lamellar composite solid electrolyte β-conformation polyvinylidene fluoride(PVDF) room-temperature ionic conductivity lithium-ion transference number

Friction Properties of OTS SAMs and Silicon Surface under Water Lubrication

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Journal of wuhan {1. of {2.(Materials science) 2009年第2期24卷 273-277页

作者：王馨 State Key Laboratory of Tribology Tsinghua University Institute of Nuclear and New Energy technology Tsinghua University

The friction and wear properties of silicon surface covered with octadecyltrichlorosilane （OTS） self-assembled monolayers （SAMs） were investigated by a UMT-2.microtribometer with and without water as lubricant, and then compared with that of bare silicon surface. Dry friction measurement results show that OTS SAMs have a very low friction coefficient compared to bare silicon surface under lower sliding velocity and normal contact load. However, heavy wear occurs on OTS SAMs under higher contact stress and sliding velocity. Under water lubrication, OTS SAMs can prevent wear obviously and meanwhile present low coefficient of friction even under high velocities, The improved frictional and anti-wear property on OTS SAMs surface is attributed to the hydrophobic property of OTS and hydrodynamic effect of water. Furthermore, a wear critical phase diagram for OTS SAMs with and without water was proposed, which indicates that OTS SAMs working under water lubrication owns a wider range of available load and velocity to reduce friction and prevent wear.

关键词： silicon surface OTS SAMs water lubrication friction wear

Dynamic security risk assessment and optimization of power transmission system

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science{1.(Technological sciences) 2008年第6期51卷 713-723页

作者： YU YiXin1.& wang DongTao1.{1.1.Key Laboratory of Power System Simulation and Control of Ministry of Education, Tianjin university, Tianjin 30007{1.{{1. {1.school of computer & Automation, Hebei Polytechnic university, Tangshan 063009,{{1. 1. Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin 300072 China 2. {1. of computer & Automation Hebei Polytechnic University Tangshan 063009 China

The paper presents a practical dynamic security region (PDSR) based dynamic security risk assessment and optimization model for power transmission system. The cost of comprehensive security control and the influence of uncertainties of power injections are considered in the model of dynamic security risk assessment. The transient stability constraints and uncertainties of power injections can be considered easily by PDSR in form of hyper-box. A method to define and classify contingency set is presented, and a risk control optimization model is given which takes total dynamic insecurity risk as the objective function for a dominant con-tingency set. An optimal solution of dynamic insecurity risk is obtained by opti-mizing preventive and emergency control cost and contingency set decomposition. The effectiveness of this model has been proved by test results on the New Eng-land 1.-genarator 39-bus system.

关键词： power transmission system risk assessment dynamic security practical dynamic security region (PDSR) comprehensive security control optimization

A thermo-responsive rewritable plasmonic bio-memory by regulating single core-satellite gold nanocluster dissociation

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Nano Research 2024年第8期17卷 7275-7282页

作者： Wen zhang Yi {1. Yamin {1. Xiaomei Lu Weibing Wu Quli Fan Lei zhang State Key Laboratory of Organic Electronics and Information Displays&Institute of Advanced Materials(IAM) Nanjing University of Posts&TelecommunicationsNanjing 210023China Jiangsu Co-Innovation Center for Efficient Processing and Utilization of Forest Resources College of Light Industry and Food EngineeringNanjing Forestry UniversityNanjing 210037China Zhengzhou Institute of Biomedical Engineering and technology Zhengzhou 450001China Key Laboratory of Flexible Electronics(KLOFE) Institute of Advanced Materials(IAM)&School of Flexible Electronics(Future Technologies)Nanjing Tech University(Nanjing Tech)Nanjing 211816China

A thermo-responsive rewritable plasmonic bio-memory chip has been successfully fabricated on an indium tin oxide(ITO)glass slide by assembling core-satellite gold nanoclusters with different size of gold nanoparticles(AuNPs)using double-strand DNA(dsDNA)*** the prepared 70@DNA2.@1. gold nanoclusters(AuNCs)exhibited more stable and greater photothermal conversion *** short time irradiation by 633 nm microbeam laser,every individual AuNCs could be excited and remove the satellite AuNPs on its ***,in the dissociation process of AuNCs with 3−5 satellite,its color would change from yellow to green,which showed more significant reduction in the red channel of the dark-field microscopy(DFM)images and could be defined to state“0”and“1.***,this plasmonic nano bio-memory could transform cyclically its state between 0 and 1.which exhibited excellent rewritable ability.

关键词： plasmonic assembly thermal-responsive single nanoparticle rewritable bio-memory

Oxygen vacancy promoting artificial atom(RuPd)by d-orbital coupling for efficient water dissociation

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Nano Research 2024年第8期17卷 7045-7052页

作者： Ruofan Shen Yanyan Liu Shuling Liu Shuyan Guan Huanhuan zhang Sehrish Mehdi Saima Ashraf {1.-Hui Xiao Erjun Liang Jianchun Jiang Yongfeng {2. Baojun Li Laboratory of Zhongyuan Light School of PhysicsZhengzhou UniversityZhengzhou 450001China Key Laboratory of Materials Physics Ministry of EducationSchool of PhysicsZhengzhou UniversityZhengzhou 450001China College of Chemistry Zhengzhou UniversityZhengzhou 450001China College of science Henan Agricultural UniversityZhengzhou 450002China Department of Chemistry Tsinghua UniversityBeijing 100084China National Engineering Lab.for Biomass Chemical Utilization Institute of Chemical Industry of Forest ProductsCAFNanjing 210042China Center for Carbon-based Electronics and Key Laboratory for the Physics and Chemistry of Nanodevices Department of ElectronicsPeking UniversityBeijing 100871China

Rational design of highly active catalysts for breaking hydrogen-oxygen bonds is of great significance in energy chemical reactions involving ***,an efficient strategy for the artificial atom(RuPd)established by d-orbital coupling and adjusted by oxygen vacancy(V_(O))is verified for water *** an experimental verification,the turnover frequency of RuPd-TiO_(2.-VO(RuPdTVO)catalyst in ammonia borane hydrolysis reaches up to 2.50 min^(−1.(2.,1.0 min−1.based on metal dispersion)in the absence of alkali,exceeding the highest active catalysts(Rh-based catalysts).The d-orbital coupling effect between Ru and Pd simulates the outer electronic structure of *** transfer from V_(O) to(RuPd)constructs an electron-rich state of active sites that further enhances the ability of the artificial atom to dissociate *** work provides an effective electronic regulation strategy from V_(O) and artificial atom constructed by d-orbital coupling effect for efficient water dissociation.

关键词： ammonia borane hydrolysis d-orbital coupling oxygen vacancy artificial atom water dissociation