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Efficiency analysis and optimization of wireless power transfer system for freely moving biomedical implants

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Science China(Technological Sciences) 2017年第1期60卷 91-101页

作者： shao qi LIU Hao FANG XueLin State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences Shenyang 110016 China University of Chinese Academy of Sciences Beijing 100049 China

In the wireless power transfer system for freely moving biomedical implants,the receiving unit was generally inefficient for the reason that its design parameters including the receiving coil's dimension and receiving circuits' topology were always determined by *** order to build the relationship between these parameters and the total transfer efficiency,this paper developed a novel efficiency model based on the impedance model of the coil and the circuit model of the receiving *** to the design constraints,the optimal design parameters in the worst case were *** results indicate that the combination of the two-layered receiving coil and half-bridge rectifier has more advantages in size,efficiency and safety,which is preferred in the receiving ***,when the load resistance increases,the optimal turn number of the receiving coil basically keeps constant and the corresponding transmitting current and total efficiency *** 100 Ω load,the transmitting current and total efficiency in the worst case were measured to be 5.30 A and 1.45% respectively,which are much better than the published *** general,our work provides an efficient method to determine the design parameters of the wireless power transfer system for freely moving biomedical implants.

关键词： wireless power transfer system capsule endoscope freely moving biomedical implants receiving coil coil optimization efficiency

Self-normalized Cramer-type Moderate Deviations for Functionals of Markov Chain

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Acta Mathematicae Applicatae Sinica 2020年第2期36卷 294-313页

作者： Xin-wei FENG qi-Man shao Zhongtai Securities Institute for Financial Studies Shandong UniversityJinan 250100China Department of Statistics The Chinese University of Hong KongShatinN.T.Hong KongChina Department of Statistics and Data Science Southern University of Science and TechnologyShenzhen 518000China

Let{xn,n≥0}be a Markov chain with a countable state space S and let f(·)be a measurable function from S to R and consider the functionals of the Markov chain yn:=f(xn).We construct a new type of self-normalized sums based on the random-block scheme and establish a Crame′r-type moderate deviations for self-normalized sums of functionals of the Markov chain.

关键词： self-normalized partial sums Cramer-type moderate deviations Markov Chain ergodic

Soft Sensing Modelling Based on Optimal Selection of Secondary Variables and Its Application

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International Journal of Automation and computing 2009年第4期6卷 379-384页

作者： qi Li Cheng shao Institute of Advanced Control Technology Dalian University of Technology Dalian 116024 PRC

The composition of the distillation column is a very important quality value in refineries, unfortunately, few hardware sensors are available on-line to measure the distillation compositions. In this paper, a novel method using sensitivity matrix analysis and kernel ridge regression （KRR） to implement on-line soft sensing of distillation compositions is proposed. In this approach, the sensitivity matrix analysis is presented to select the most suitable secondary variables to be used as the soft sensor＇s input. The KRR is used to build the composition soft sensor. Application to a simulated distillation column demonstrates the effectiveness of the method.

关键词： Distillation column sensitivity matrix analysis ridge regression kernel ridge regression (KRR) soft sensor

Identifying the limiting distribution by a general approach of Stein's method

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Science China Mathematics 2016年第12期59卷 2379-2392页

作者： shao qi-Man ZHANG Zhuo-Song Department of Statistics The Chinese University of Hong Kong

A general exchange pair approach is developed to identify the limiting distribution for any sequence of random variables, by calculating the conditional mean and the conditional second moments. The error of approximation is also studied. In particular, a Berry-Esseen type bound of O(n^(-3/4)) is obtained for the Curie-Weiss model at the critical temperature.

关键词： Stein's method exchangeable pair limiting distribution Berry-Esseen bounds Curie-Weiss model

Exponential Attractor of the 3D Derivative Ginzburg-Landau Equation

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Acta Mathematica Sinica,English Series 2008年第5期24卷 809-828页

作者： Shu Juan LU qi shao LU Department of Mathematics & LMIB Beijing University of Aeronautics and Astronautics Beijing 100083 P. R. China

In this paper, we consider a derivative Ginzburg-Landau-type equation with periodic initial-value condition in three-dimensional spaces. Sufficient conditions for existence and uniqueness of a global solution are obtained by uniform a priori estimates of the solution. Furthermore, the existence of a global attractor and an exponential attractor with finite dimensions are proved.

关键词： derivative Ginzburg-Landau equation global attractor exponential attractor Hausdorff dimension fractal dimension

On the Longest Length of Consecutive Integers

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Acta Mathematica Sinica,English Series 2011年第2期27卷 329-338页

作者： Min Zhi ZHAO qi-Man shao Department of Mathematics Zhejiang University Hangzhou 310027 P. R. China Department of Mathematics Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong P. R. China

Choose m numbers from the set {1,2,... ,n} at random without replacement. In this paper we first establish the limiting distribution of the longest length of consecutive integers and then apply the result to test rand... 详细信息

关键词： Sampling without replacement consecutive integers limit distribution test of randomness

Self-normalization:Taming a wild population in a heavy-tailed world

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Applied Mathematics(A Journal of Chinese Universities) 2017年第3期32卷 253-269页

作者： shao qi-man ZHOU Wen-xin Department of Statistics The Chinese University of Hong Kong Department of Mathematics University of California

The past two decades have witnessed the active development of a rich probability theory of Studentized statistics or self-normalized processes, typified by Student’s t-statistic as introduced by W. S. Gosset more than a century ago, and their applications to statistical problems in high dimensions, including feature selection and ranking, large-scale multiple testing and sparse, high dimensional signal detection. Many of these applications rely on the robustness property of Studentization/self-normalization against heavy-tailed sampling distributions. This paper gives an overview of the salient progress of self-normalized limit theory, from Student’s t-statistic to more general Studentized nonlinear statistics. Prototypical examples include Studentized one- and two-sample U-statistics. Furthermore, we go beyond independence and glimpse some very recent advances in self-normalized moderate deviations under dependence.

关键词： Berry-Esseen inequality Hotelling’s T 2-statistic large deviation moderate deviation self-normalization Student’s t-statistic U-statistic

Berry-Esseen Bounds for Self-Normalized Martingales

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Communications in Mathematics and Statistics 2018年第1期6卷 13-27页

作者： Xiequan Fan qi-Man shao Center for Applied Mathematics Tianjin UniversityTianjin 300072China Department of Statistics Chinese University of Hong KongShatinNTHong Kong

A Berry–Esseen bound is obtained for self-normalized martingales under the assumption of finite *** bound coincides with the classical Berry–*** of the *** to Student’s statistic and autoregressive process are also... 详细信息

关键词： Self-normalized process Berry-Esseen bounds Martingales Student’s statistic Autoregressive process

Exposed facet-controlled N2 electroreduction on distinct Pt3Fe nanostructures of nanocubes, nanorods and nanowires

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National Science Review 2021年第1期8卷 117-126页

作者： Wu Tong Bolong Huang Pengtang Wang qi shao Xiaoqing Huang College of Chemistry Chemical Engineering and Materials Science Soochow University Department of Applied Biology and Chemical Technology Hong Kong Polytechnic University

Understanding the correlation between exposed surfaces and performances of controlled nanocatalysts can aid effective strategies to enhance electrocatalysis, but this is as yet unexplored for the nitrogen reduction reaction （NRR）. Here, we first report controlled synthesis of well-defined Pt3Fe nanocrystals with tunable morphologies （nanocube, nanorod and nanowire） as ideal model electrocatalysts for investigating the NRR on different exposed facets. The detailed electrocatalytic studies reveal that the Pt3Fe nanocrystals exhibit shape-dependent NRR electrocatalysis. The optimized Pt3Fe nanowires bounded with high-index facets exhibit excellent selectivity （no N2H4 is detected）, high activity with NH3yield of 18.3μg h-1mg-1cat(0.52μg h-1cm-2ECSA; ECSA:electrochemical active surface area) and Faraday efficiency of 7.3%at-0.05 V versus reversible hydrogen electrode, outperforming the{200}facet-enclosed Pt3Fe nanocubes and{111}facet-enclosed Pt3Fe nanorods. They also show good stability with negligible activity change after five cycles. Density functional theory calculations reveal that, with high-indexed facet engineering, the Fe-3d band is an efficient d-d coupling correlation center for boosting the Pt 5d-electronic exchange and transfer activities towards the NRR.

关键词： Pt3Fe nanowire high-index facet-controlled N2 reduction