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A 90nm Passive RFID Tag's Custom Baseband Processor for Subthreshold Operation Below 0.3V

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Chinese Journal of Electronics 2017年第4期26卷 720-724页

作者： SHI Weiwei PENG Panfeng CHOY Chiu-sing Shenzhen University Shenzhen Key Laboratory of Advanced Communication and Information Processing Chinese University of Hong Kong

In the design of passive Radio frequency(RF) tags’ baseband processor, subthreshold timing and wide-range-Process, voltage and temperature(PVT) variation problems are the bottlenecks to extend the tag’s working range. A sophisticated processor is presented based on the EPC and ISO protocol. Power-aware ideas are applied to the entire processor, including data link portions. Innovatively, a novel custom ratioed logic style is adopted in critical logic paths to fundamentally speed up the circuit operations at ultra-low-voltage. The proposed baseband processor was fabricated in 90 nm CMOS, another baseband processor design by regular standard-cell-based design flow was also fabricated for comparison. In measurement the proposed design indicates good robustness in wide-range supply and frequency variation and much more competent for subthreshold operation. It can operate at minimum 0.28 V supply with power consumption of129 n W.

关键词： Subthreshold RFID Custom logic Low power

Takagi-Sugeno fuzzy model identification for turbofan aero-engines with guaranteed stability

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Chinese Journal of Aeronautics 2018年第6期31卷 1206-1214页

作者： Ruichao LI Yingqing GUO sing Kiong NGUANG Yifeng CHEN School of Power and Energy Northwestern Polytechnical University Department of Electrical and Computer Engineering The University of Auckland

This paper is concerned with identifying a Takagi-Sugeno（TS） fuzzy model for turbofan aero-engines working under the maximum power status（non-afterburning）. To establish the fuzzy system, theoretical contributions are made as follows. First, by fixing antecedent parameters, the estimation of consequent parameters in state-space representations is formulated as minimizing a quadratic cost function. Second, to avoid obtaining unstable identified models, a new theorem is proposed to transform the prior-knowledge of stability into constraints. Then based on the aforementioned work, the identification problem is synthesized as a constrained quadratic *** solving the constrained optimization, a TS fuzzy system is identified with guaranteed ***, the proposed method is applied to the turbofan aero-engine using simulation data generated from an aerothermodynamics component-level model. Results show the identified fuzzy model achieves a high fitting accuracy while stabilities of the overall fuzzy system and all its local models are also guaranteed.

关键词： Constrained optimization Fuzzy system Stability System identification Turbofan engine

Martin boundary and exit space on the Sierpinski gasket

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Science China Mathematics 2012年第3期55卷 475-494页

作者： LAU Ka-sing NGAI Sze-Man Department of Mathematics The Chinese University of Hong Kong Department of Mathematical Sciences Georgia Southern University

We define a new Markov chain on the symbolic space representing the Sierpinski gasket (SG),and show that the corresponding Martin boundary is homeomorphic to the SG while the minimal Martin boundary is the three vertices of the *** addition,the harmonic structure induced by the Markov chain coincides with the canonical one on the *** suggests another approach to consider the existence of Laplacians on those self-similar sets for which the problem is still not settled.

关键词： Martin boundary Markov chain Green function harmonic function fractal Sierpinski gasket

Spacing optimization of high power LED arrays for solid state lighting

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Journal of Semiconductors 2011年第1期32卷 45-49页

作者： Y.sing Chan S.W.Ricky Lee Electronic Packaging Laboratory Center for Advanced Microsystems Packaging Hong Kong University of Science and Technology

This paper provides an analytical approach to determine the optimum pitch by utilizing a thermal resistance network, under the assumption of constant luminous efficiency. This work allows an LED array design which is mounted on a printed circuit board （PCB） attached with a heat sink subject to the natural convection cooling. Being validated by finite element （FE） models, the current approach can be shown as an effective method for the determination of optimal component spacing in an LED array assembly for SSL.

关键词： high power LED thermal resistance network finite element modeling

Dynamics of Below—Band—Gap Carrier in Highly Excited GaN

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Chinese Physics Letters 2003年第5期20卷 749-752页

作者： GUOBing WONGKam-sing YEZhi-Zhen JIANGHong-Xing LINJing-Yu DepartmentofPhysics TheHongKongUniveristyofScienceandTechnologyClearWaterBaykowloonHongKong StateKeyLaboratoryofsiliconMaterials ZhejiangUniversityHangzhou310027 DepartmentofPhysics KansasStateUniversityManhattanKansas66506-2601USA

Femtosecond time-resolved reflectivity was used to investigate below-band-gap (3.1 eV) carrier dynamics in a nominally undoped GaN epilayer under high excitation. A 2.5-ps rising process can be observed in the transient trace. This shot rising time results from the hot phonon effects which can cause a delayed energy relaxation of the initial photocarriers toward the band edge. From the density dependence of the carrier dynamics, the Mott density was estimated to be 1.51-1.56 x 1019cm-3. Below the Mott density, the initial probed carrier dynamics was explained to the effect of acoustic phonon-assisted tunneling for localized states, where a significant excitation density dependence of the tunneling probability was observed due to the optically-induced bandtail extension to lower energies. Above the Mott density, the measured carrier dynamics reflected the relaxation of an electron-hole plasma, in which a distinct fast decay component of 2.3 ps was observed due to the onset of nonlinear relaxation processes such Auger recombination.

关键词： GaN 氮化镓半导体反射率动力学光谱分析性质热声效应隧道效应

Bi-level Optimal Planning of Voltage Regulator in Distribution Systems Considering Maximization of Incentive-based Photovoltaic Energy Integration

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CSEE Journal of Power and Energy Systems 2023年第6期9卷 2008-2017页

作者： Xu Xu Youwei Jia Chun sing Lai Minghao Wang Zhao Xu Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhenChina Department of Electrical Engineering The Hong Kong Polytechnic UniversityHung HomHong Kong SARChina Department of Electrical and Electronic Engineering University Key Laboratory of Advanced Wireless Communications of Guangdong ProvinceSouthern University of Science and TechnologyShenzhen 515100China Department of Electronic and Computer Engineering Brunel Institute of Power SystemsBrunel University LondonLondonUB83PH United Kingdom Department of Electrical Engineering Shenzhen Research InstituteThe Hong Kong Polytechnic UniversityHung HomHong Kong SARChina

This paper focuses on optimal voltage regulator(VR)planning to maximize the photovoltaic(PV)energy integration in distribution *** describe the amount of dynamic PV energy that can be integrated into the power system,the concept of PV accommodation capability(PVAC)is introduced and modeled with *** proposed planning model is formulated as a Benders decomposition based bi-level stochastic optimization *** the upper-level problem,VR planning decisions and PVAC are determined via mixed integer linear programming(MILP)before considering *** in the lower-level problem,the feasibility of first-level results is checked by critical network constraints(*** magnitude constraints and line capacity constraints)under uncertainties considered by time-varying loads and PV *** this paper,these uncertainties are represented in the form of operational scenarios,which are generated by the Gaussian copula theory and reduced by a well-studied backward-reduction *** modified IEEE 33-node distribution grid is utilized to verify the effectiveness of the proposed *** results demonstrate that a PV energy integration can be significantly enhanced after optimal voltage regulator planning.

关键词： Bi-level stochastic optimization problem critical network constraints photovoltaic energy integration uncertainties voltage regulator planning

The Nano Research Young Innovators Awards in bio-inspired nanomaterials

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Nano Research 2024年第2期17卷 417-425页

作者： Jun Chen Shuotao Wang Department of Bioengineering University of CaliforniaLos AngelesLos AngelesCA 90095USA Key Laboratory of Bio-inspired Materials and Interfacial Science Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China

Nano Research Young Innovators(NR45)Awards are designed to acknowledge and celebrate the achievements of young researchers under 45 years of *** individuals have made significant contributions to the field of nanoscience and *** the inaugural NR45 Awards in 2018,the journal's editorial board has recognized over a hundred innovators specializing in nanobiotechnology,nano energy,two-dimensional materials,and *** focus of the 2023 NR45 Awards is on bioinspired nanomaterials,acknowledging thirty-three outstanding young innovators for their extraordinary contributions in developing these materials with applications spanning clean energy,human healthcare,monitoring,and disease treatments,as shown in *** extend our heartfelt congratulations to all the 33 NR45 Awardees in 2023!

关键词： journal materials contributions

AUSM-Based High-Order Solution for Euler Equations

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Communications in Computational Physics 2012年第9期12卷 1096-1120页

作者： Angelo L.Scandaliato Meng-sing Liou Ohio Aerospace Institute ClevelandOH44142USA NASA Glenn Research Center ClevelandOH44135USA

In this paper we demonstrate the accuracy and robustness of combining the advection upwind splitting method(AUSM),specifically AUSM+-UP[9],with highorder upwind-biased interpolation procedures,theweighted essentially non-oscillatory(WENO-JS)scheme[8]and its variations[2,7],and the monotonicity preserving(MP)scheme[16],for solving the Euler *** is found to be more effective than the three WENO variations ***+-UP is also shown to be free of the so-called“carbuncle”phenomenon with the high-order *** characteristic variables are preferred for interpolation after comparing the results using primitive and conservative variables,even though they require additional matrix-vector *** using the Roe flux with an entropy fix and the Lax-Friedrichs approximate Riemann solvers are also included for *** addition,four reflective boundary condition implementations are compared for their effects on residual convergence and solution ***,a measure for quantifying the efficiency of obtaining high order solutions is proposed;the measure reveals that a maximum return is reached after which no improvement in accuracy is possible for a given grid size.

关键词： Shock capturing advection upwind splitting Euler equations weighted essentially non-oscillatory monotonicity preserving

Roles of computational modelling in understanding p53 structure, biology, and its therapeutic targeting

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Journal of Molecular Cell Biology 2019年第4期11卷 306-316页

作者： Yaw sing Tan Yasmina Mhoumadi Chandra S. Verma Bioinformatics Institute Agency for Science Technology and Research Singapore 138671 School of Biological Sciences Nanyang Technological University Singapore 637551 Department of Biological Sciences National University of Singapore Singapore 117543

The transcription factor p53 plays pivotal roles in numerous biological processes, including the suppression of tumours. The rich availability of biophysical data aimed at understanding its structure–function relationships since the 1990s has enabled the application of a variety of computational modelling techniques towards the establishment of mechanistic models. Together they have provided deep insights into the structure, mechanics, energetics, and dynamics of p53. In parallel, the observation that mutations in p53 or changes in its associated pathways characterize several human cancers has resulted in a race to develop therapeutic modulators of p53, some of which have entered clinical trials. This review describes how computational modelling has played key roles in understanding structural-dynamic aspects of p53, formulating hypotheses about domains that are beyond current experimental investigations, and the development of therapeutic molecules that target the p53 pathway.

关键词： p53 structure computational modelling therapeutic targeting