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Recursive Approximation of Complex Behaviours With IoT-Data Imperfections

IEEE/CAA Journal of Automatica Sinica 2020年第3期7卷 656-667页

作者： Korkut Bekiroglu Seshadhri Srinivasan Ethan Png rong su Constantino Lagoa College of Engineering SUNY Polytechnic InstituteUtica 13503NYUSA Berkeley Education Alliance for Research in Singapore(BEARS) Singapore 138602Singapore School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798Singapore IEEE Electrical Engineering Department of Pennsylvania State University ParkPA 16802 USA

This paper presents an approach to recursively estimate the simplest linear model that approximates the time-varying local behaviors from imperfect(noisy and incomplete) measurements in the internet of things(IoT) based distributed decision-making problems. We first show that the problem of finding the lowest order model for a multi-input single-output system is a cardinality(l0) optimization problem, known to be *** solve the problem a simpler approach is proposed which uses the recently developed atomic norm concept and the modified Frank-Wolfe(mFW) algorithm is introduced. Further, the paper computes the minimum data-rate required for computing the models with imperfect measurements. The proposed approach is illustrated on a building heating, ventilation, and air-conditioning(HVAC) control system that aims at optimizing energy consumption in commercial buildings using IoT devices in a distributed manner. The HVAC control application requires recursive thermal dynamical model updates due to frequently changing conditions and non-linear dynamics. We show that the method proposed in this paper can approximate such complex dynamics on single-board computers interfaced to sensors using unreliable communication channels. Real-time experiments on HVAC systems and simulation studies are used to illustrate the proposed method.

关键词： Adaptability distributed decision systems imperfect measurements internet of things(IoT) low order model identification

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Optimum Metallic-Bond Scheme: A Quantitative Analysis of Mass Spectra of Sodium Clusters

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Chinese Physics Letters 2001年第12期18卷 1575-1577页

作者： su Chang-rong LI Jia-Ming Department of Physics Center for Atomic and Molecular NanosciencesTsinghua UniversityBeijing 100084 Institute of Physics Chinese Academy of SciencesBeijing 100080

Based on the results of the optimum metallic-bond scheme for sodium clusters, we present a quantitative analysis of the detailed features of the mass spectra of sodium clusters. We find that, in the generation of sodium clusters with various abundances, the quasi-steady processes through adding or losing a sodium atom dominate. The quasi-steady processes through adding or losing a sodium dimer are also important to understand the detailed features of mass spectra for small clusters.

关键词： adding quasi spectra

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Numerical Simulation of Droplet Generation in Coaxial Microchannels

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Fluid Dynamics & Materials Processing 2024年第3期20卷 487-504页

作者： Zongjun Yin rong su Hui Xu School of Mechanical Engineering Anhui Institute of Information TechnologyWuhu241100China

In this study,numerical simulations of the pinching-off phenomena displayed by the dispersed phase in a continuous phase have been conducted using COMSOL Multiphysics(level-set method).Four flow patterns,namely“drop flow”,“jet flow”,“squeeze flow”,and“co-flow”,have been obtained for different flow velocity ratios,channel diameter ratios,density ratios,viscosity ratios,and surface *** flow pattern map of two-phase flow in coaxial microchannels has been obtained accordingly,and the associated droplet generation process has been critically discussed considering the related frequency,diameter,and pinch-off *** particular,it is shown that the larger the flow velocity ratio,the smaller the diameter of generated droplets and the shorter the pinch-off *** pinch-off length of a droplet is influenced by the channel diameter ratio and density *** changes in viscosity ratio have a negligible influence on the droplet generation pinching *** an increase in surface tension,the frequency of generation and pinch-off length of droplets decrease,but for small surface tension the generation diameter of droplet increases.

关键词： Droplet generation characteristics coaxial microchannels flow patterns pinch-off length

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Preparation and characterization of hollow carambola-shaped silver sulfide microspheres using a microwave-assisted template-free method

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Chinese Chemical Letters 2016年第3期27卷 451-453页

作者： Wei su rong Li Yan-Jun Xing College of Chemistry. Chemical Engineering and Biotechnology of Donghua University Shanghai 201620. China National Engineering Research Center for Dyeing & Finishing of Textiles Shanghai 201620 China

A simple and convenient method, free of template, has been proposed to synthesize hollow carambolashaped Ag2 S microspheres with Ag NO3, thiourea（TU）, Na Cl and diethanolamine as reagents using a microwave-assisted method, at low temperatures of below 100 ℃. Powder X-ray diffraction（XRD）,scanning electron microscopy（FESEM） and high resolution transmission electron microscopy（HRTEM）were employed to characterize the morphology and composition of those microspheres. The results indicated that the hollow carambola-shaped silver sulfide microspheres（with high purity and homogeneous morphology） were prepared by an Ostwald ripening process. A possible formation mechanism of hollow carambola-shaped Ag2 S microspheres was proposed.

关键词： Silver sulfide Hollow carambola-shaped Microwave-assisted method Template-free

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Vector and Spinor Decomposition of su（2） Gauge Potential, Their Equivalence, and Knot Structure in su（2） Chern-Simons Theory

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Communications in Theoretical Physics 2007年第5期47卷 875-878页

作者： DUAN Yi-Shi REN Ji-rong LI Ran Institute of Theoretical Physics Lanzhou University Lanzhou 730000 China

In this paper, spinor and vector decompositions of su（2） gauge potential are presented and their equivalence is constructed using a simply proposal. We also obtain the action of Faddeev nonlinear 0（3） sigma model from the su（2） mass/ve gauge field theory, which is proposed according to the gauge invariant principle. At last, the knot structure in su（2） Chern-Simons filed theory is discussed in terms of the Φ-mapping topological current theory, The topological charge of the knot is characterized by the Hopf indices and the Brouwer degrees of Φ-mapping.

关键词： su(2) gauge potential decomposition massive gauge theory Chern-Simons knot

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Fabrication of ZnO with tunable morphology through a facile treatment of Zn-based coordination polymers

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Science China Chemistry 2015年第3期58卷 411-416页

作者： Panpan su Jiao Zhao Feng rong Can Li Qihua Yang State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences

The morphology and structure of zinc oxide(ZnO), one of the important semiconductors, are relevant to its properties and applications. The preparation of ZnO with tunable morphology and desired structure is an attractive topic in the field of material synthesis. This work reports a facile method for the synthesis of Zn O with controllable morphology and crystal orientation using Zn-based coordination polymer particles(Zn-CPP) as precursors. Using hydrothermal method, Zn-CPP with morphologies of microrod, nanoplate, flower-like, arrow-tipped microsheet, and square cylinder were successfully synthesized via the coordination between metal ions Zn2+ and organic ligand 1,4,5,8-naphthalenetetracarboxylic dianhydride in aqueous solution. subsequent thermal treatment of the Zn-CPP successfully resulted in the formation of porous Zn O with similar morphology to Zn-CPP. It is also found that the Zn O with enhanced(002) orientation could be obtained from Zn-CPP with preferred(002) orientation. This strategy could be extended for the preparation of other metal oxides with desired shape and structure.

关键词： ZnO coordination polymers hydrothermal method micro and nanostructure specific morphology

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Capillary bridges and capillary forces between two axisymmetric power-law particles

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Particuology 2016年第4期14卷 122-127页

作者： Lefeng Wang Fengting su Huichao Xu Weibin rong Hui Xie State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin 150080 China

Capillary interactions are fundamentally important in many scientific and industrial fields. However, most existing models of the capillary bridges and capillary forces between two solids with a mediated liquid, are based on extremely simple geometrical configurations, such as sphere-plate, sphere-sphere, and plate-plate. The capillary bridge and capillary force between two axisymmetric power-law profile particles with a mediated constant-volume liquid are investigated in this study. A dimensionless method is adopted to calculate the capillary bridge shape between two power-law profile particles based on the Young-Laplace equation. The critical rupture criterion of the liquid bridge is shown in four forms that produce consistent results. It was found that the dimensionless rupture distance changes little when the shape index is larger than 2. The results show that the power-law index has a significant influence on the capillary force between two power-law particles. This is directly attributed to the different shape profiles of power-law particles with different indices. Effects of various other parameters such as ratio of the particle equivalent radii, liquid contact angle, liquid volume, and interparticle distance on the capillary force between two power-law particles are also examined.

关键词： Capillary force Power-law profile particles Power-law index Rupture distance

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In situ self-assembly of amphiphilic dextran micelles and superparamagnetic iron oxide nanoparticle-loading as magnetic resonance imaging contrast agents

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Regenerative Biomaterials 2023年第1期10卷 194-204页

作者： Linrui Jiang rong Zheng Ni Zeng Changqiang Wu Hongying su Faculty of Chemical Engineering Kunming University of Science and TechnologyKunming 650500China Sichuan Key Laboratory of Medical Imaging North Sichuan Medical CollegeNanchong 637000China

Polymeric micelles have long been considered as promising nanocarrier for hydrophobic drugs and imaging probes,due to their nanoscale particle size,biocompatibility and ability to loading reasonable amount of ***,a facile method for dextran micelles preparation was developed and their performance as carriers of superparamagnetic iron oxide(SPIO)nanocrystals was *** dextran(Dex-g-OA)was synthesized via the Schiff base reactions between oxidized dextran and oleylamine,and self-assembled in situ into nano-size micelles in the reaction *** self-assembling behaviors of the amphiphilic dextran were identified using fluorescence resonance energy transfer technique by detection the energy transfer signal between the fluorophore pairs,Cy5 and *** SPIO nanoparticles(Fe_(3)O_(4)NPs)were successfully loaded into the dextran micelles via the in situ self-assembly process,leading to a series of Fe_(3)O_(4)NPs-loaded micelle nanocomposites(Fe_(3)O_(4)@Dex-g-OA)with good biocompatibility,superparamagnetism and strongly enhanced T_(2)*** the magnetic field of 0.5 T,the Fe_(3)O_(4)@Dex-g-OA nanocomposite with particle size of 116.2±53.7 nm presented a higher T_(2)relaxivity of 327.9 mM_(re)^(-1)·s^(-1)·s^(−1).The prepared magnetic nanocomposites hold the promise to be used as contrast agents in magnetic resonance imaging.

关键词： micelle dextran superparamagnetic iron oxide magnetic resonance imaging Schiff base

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Multiple Elite Individual Guided Piecewise Search-Based Differential Evolution

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IEEE/CAA Journal of Automatica Sinica 2023年第1期10卷 135-158页

作者： Shubham Gupta Shitu Singh rong su Shangce Gao Jagdish Chand Bansal the School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798Singapore the Department of Mathematics South Asian UniversityNew Delhi 110021India IEEE Faculty of Engineering University of ToyamaToyama-shi 930-8555Japan

The differential evolution(DE)algorithm relies mainly on mutation strategy and control parameters'*** take full advantage of top elite individuals in terms of fitness and success rates,a new mutation operator is *** control parameters such as scale factor and crossover rate are tuned based on their success rates recorded over past evolutionary *** proposed DE variant,MIDE,performs the evolution in a piecewise manner,i.e.,after every predefined evolutionary stages,MIDE adjusts its settings to enrich its diversity *** performance of the MIDE is validated on two different sets of benchmarks:CEC 2014 and CEC 2017(special sessions&competitions on real-parameter single objective optimization)using different performance *** the end,MIDE is also applied to solve constrained engineering *** efficiency and effectiveness of the MIDE are further confirmed by a set of experiments.

关键词： Control parameters differential Evolution metaheuristic algorithms mutation operator

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Code Transform Model Producing High-Performance Program

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Computer Modeling in Engineering & Sciences 2021年第10期129卷 253-277页

作者： Bao rong Chang Hsiu-Fen Tsai Po-Wen su Department of Computer Science and Information Engineering National University of KaohsiungKaohsiungTaiwan Department of Fragrance and Cosmetic Science Kaohsiung Medical UniversityKaohsiungTaiwan

This paper introduces a novel transform method to produce the newly generated programs through code transform model called the second generation of Generative Pre-trained Transformer(GPT-2)reasonably,improving the program execution performance ***,a theoretical estimation in statistics has given the minimum number of generated programs as required,which guarantees to find the best one within *** proposed approach can help the voice assistant machine resolve the problem of inefficient execution of application *** addition to GPT-2,this study develops the variational Simhash algorithm to check the code similarity between sample program and newly generated program,and conceives the piecewise longest common subsequence algorithm to examine the execution’s conformity from the two programs mentioned *** code similarity check deducts the redundant generated programs,and the output conformity check finds the best-performing generative *** addition to texts,the proposed approach can also prove the other media,including images,sounds,and *** a result,the newly generated program outperforms the sample program significantly because the number of code lines reduces 27.21%,and the program execution time shortens 24.62%.

关键词： Newly generated programs GPT-2 predetermined generative programs variational Simhash algorithm piecewise longest common subsequence

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