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Facial Image Attributes Transformation via Conditional Recycle Generative Adversarial Networks

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Journal of Computer Science & Technology 2018年第3期33卷 511-521页

作者： huai-yu Li Wei-Ming Dong Bao-Gang Hu National Laboratory of Pattern Recognition Institute of Automation Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China

This study introduces a novel conditional recycle generative adversarial network for facial attribute transfor- mation, which can transform high-level semantic face attributes without changing the identity. In our approach, we input a source facial image to the conditional generator with target attribute condition to generate a face with the target attribute. Then we recycle the generated face back to the same conditional generator with source attribute condition. A face which should be similar to that of the source face in personal identity and facial attributes is generated. Hence, we introduce a recycle reconstruction loss to enforce the final generated facial image and the source facial image to be identical. Evaluations on the CelebA dataset demonstrate the effectiveness of our approach. Qualitative results show that our approach can learn and generate high-quality identity-preserving facial images with specified attributes.

关键词： generative adversarial network image editing facial attributes transformation

NUMERICAL PREDICTION OF SUBMARINE HYDRODYNAMIC COEFFI-CIENTS USING CFD SIMULATION

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Journal of Hydrodynamics 2012年第6期24卷 840-847页

作者： PAN yu-cun ZHANG huai-xin ZHOU Qi-dou State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University Department of Naval Architecture Naval University of Engineering

The submarine Hydrodynamic coefficients are predicted by numerical simulations. Steady and unsteady Reynolds Averaged Navier-Stokes （RANS） simulations are carried out to numerically simulate the oblique towing experiment and the Planar Motion Mechanism （PMM） experiment performed on the SUBOFF submarine model. The dynamic mesh method is adopted to simulate the maneuvering motions of pure heaving, pure swaying, pure pitching and pure yawing. The hydrodynamic forces and moments acting on the maneuvering submarine are obtained. Consequently, by analyzing these results, the hydrodynamic coefficients of the submarine maneuvering motions can be determined. The computational results are verified by comparison with experimental data, which show that this method can be used to estimate the hydrodynamic derivatives of a fully appended submarine.

关键词： submarine maneuverability hydrodynamic coefficients Planar Motion Mechanism (PMM) dynamic mesh

Some notes on numerical investigation of three cavitation models through a verification and validation procedure

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Journal of Hydrodynamics 2023年第1期35卷 185-190页

作者： Lin-feng Deng yun Long huai-yu Cheng Bin Ji State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan430072China Wuhan Second Ship Design and Research Institute Wuhan430064China

The present paper investigates the turbulent cavitating flow around the Clark-Y hydrofoil with special emphasis on the influence of cavitation models by verification and validation(V&V)*** solver coupled with the three major cavitation models(i.e.,Zwart-Gerber-Belamri,Schnerr and Sauer and full cavitation model,which are abbreviated to ZGB model,SS model and FC model respectively)is employed in this *** results indicate that the three cavitation models can properly reproduce the cavitation *** model and SS model give better prediction in the overall cavitation *** model exhibits an obvious under-estimation for the sheet cavity,and the predicted volume fraction is closely related to the turbulent *** verification and validation procedure is involved to quantitatively assess the accuracy of these three cavitation *** is indicated that the V&V procedure is suitable for the unsteady cavitating *** errors estimate is robust and conservative within the cavitation region,while gets closer to zero in the no-cavitation *** addition,ZGB model exhibits the highest overall accuracy among the three models,which further verifies its wide applicability.

关键词： Cavitating flow cavitation model verification and validation(V&V) error estimate

Preventing structural aging with synthetic tooth enamel

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Science China Materials 2017年第7期60卷 683-684页

作者： Li-Bo Mao huai-Ling Gao Shu-Hong yu Division of Nanomaterials ＆ Chemistry Hefei National Laboratory for Physical Sciences at the Microscale Department of Chemistry University of Science and Technology of China Hefei 230026 China

Teeth are typically non-regenerative and permanent skele- tal structures and their resilience to aging is one of the top requirements for the survival of the species. Recent investi- gations on mechanical properties of laboratory-made teeth enamel analogs show that they have a unique combination of stiffness, E, and vibration damping, tanδ .

关键词：英语阅读理解材料科学

Neural-Network-Based Nonlinear Model Predictive Tracking Control of a Pneumatic Muscle Actuator-Driven Exoskeleton

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IEEE/CAA Journal of Automatica Sinica 2020年第6期7卷 1478-1488页

作者： yu Cao jian Huang IEEE Key Laboratory of Image Processing and Intelligent Control School of Artificial Intelligence and AutomationHuazhong University of Science and TechnologyWuhan 430074China

Pneumatic muscle actuators(PMAs)are compliant and suitable for robotic devices that have been shown to be effective in assisting patients with neurologic injuries,such as strokes,spinal cord injuries,etc.,to accomplish rehabilitation ***,because PMAs have nonlinearities,hysteresis,and uncertainties,etc.,complex mechanisms are rarely involved in the study of PMA-driven robotic *** this paper,we use nonlinear model predictive control(NMPC)and an extension of the echo state network called an echo state Gaussian process(ESGP)to design a tracking controller for a PMA-driven lower limb *** dynamics of the system include the PMA actuation and mechanism of the leg orthoses;thus,the system is represented by two nonlinear uncertain *** facilitate the design of the controller,joint angles of leg orthoses are forecasted based on the universal approximation ability of the ESGP.A gradient descent algorithm is employed to solve the optimization problem and generate the control *** stability of the closed-loop system is guaranteed when the ESGP is capable of approximating system *** and experiments are conducted to verify the approximation ability of the ESGP and achieve gait pattern training with four healthy subjects.

关键词： Echo state Gaussian process model predictive control neural network pneumatic muscle actuators-driven exoskeleton

Robust Control for Discrete-Time T-S Fuzzy Singular Systems

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Journal of Systems Science & Complexity 2021年第4期34卷 1345-1363页

作者： CHEN jian yu Jinpeng School of Information and Control Engineering Qingdao University of TechnologyQingdao 266520China School of Automation Qingdao UniversityQingdao 266071China

This paper deals with the robust admissibility and state feedback stabilization problems for discrete-time T-S fuzzy singular systems with norm-bounded *** introducing a new approximation technique,the initial membership functions are conveniently expressed in piecewiselinear functions with the consideration of the approximation *** utilizing the piecewise-linear membership functions,the fuzzy weighting-based Lyapunov function and the use of auxiliary matrices,the admissibility of the systems is determined by examining the conditions at some sample *** conditions can be reduced into the normal parallel distributed compensation ones by choosing special values of some slack ***,the authors design the robust state feedback controller to guarantee the closed-loop system to be *** examples are provided to illustrate the advantage and effectiveness of the proposed method.

关键词： Admissible discrete-time singular systems piecewise-linear membership functions state feedback T-S fuzzy models

Large eddy simulation of the transient cavitating vortical flow in a jet pump with special emphasis on the unstable limited operation stage

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Journal of Hydrodynamics 2020年第2期32卷 345-360页

作者： Xin-ping Long Dan Zuo huai-yu Cheng Bin Ji Hubei Key Laboratory of Waterjet Theory and New Technology School of Power and Mechanical EngineeringWuhan UniversityWuhan430072China Key Laboratory of Transients in Hydraulic Machinery Ministry of EducationWuhan UniversityWuhan430072China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan430072China

This paper studies the unsteady three-dimensional cavitating turbulent flow in a jet ***,thefocus is on the unstable limited operation stage,and both the computational and experimental methods are *** the experiments,the distribution of the wall pressure,as well as the evolution of cavitation over time,are obtained for a jet *** is carried out using the large eddy simulation,combined with a mass transfer cavitation *** numerical results are compared with the experimental results,including the fundamental performances(the pressure ratio h and the efficiencyη),as well as the wall pressure *** the experimental and computational results indicate that the evolution of the cavitation over time in a jet pump is a quasi-periodic process during the unstable limited operation *** annular vortex cavitation inception,development and collapse predicted by the large eddy simulation agree fairly well with the experimental ***,the relationship between the cavitation and the vortex structure is discussed based on the numerical results,and it is shown that the development of the vortex structures in the jet pump is closely related to the evolution of the *** cavitation-vortex interaction is thoroughly analyzed based on the vorticity transport *** analysis reveals that the cavitation in a jet pump dramatically influences the distribution and the production of the *** process of the annular cavitation inception,development,and collapse involves a significant increase of the vorticity.

关键词： Cavitation jet pump large eddy simulation vortex structure vorticity transport equation

Second-order interference of two independent photons with different spectra

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Chinese Physics B 2019年第10期28卷 345-353页

作者： yu Zhou jian-Bin Liu huai-Bin Zheng Hui Chen Fu-Li Li Zhuo Xu MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter Department of Applied PhysicsXi’an Jiaotong UniversityXi’an 710049China Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education (MOE)& International Center for Dielectric ResearchSchool of Electronic and Information EngineeringXi’an Jiaotong UniversityXi’an 710049China The Key Laboratory of Weak Light Nonlinear Photonics(Nankai University) Tianjin 300457China

The second-order interference of two independent photons with different spectra in a Shih-Alley/Hong-Ou-Mandel interferometer is studied in Feynman's path integral theory. There is a second-order interference pattern for photons with different spectra if the photons are indistinguishable for the employed detection system. The conditions to observe the second-order temporal beating with photons of different spectra are analyzed. The influence of the response time of the detection system on the observed second-order interference pattern is also discussed. It is a direct result of that measurement in quantum mechanics is dependent on the employed measuring apparatus. The results are helpful to understand the physics of two-photon interference in different schemes.

关键词： two-photon interference Feynman's path integral theory Hong-Ou-Mandel interferometer

High Temperature Phase Transitions in Na_xCoO_2 Materials

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Chinese Journal of Structural Chemistry 2006年第8期25卷 997-1003页

作者： NIE Chang-jiang YANG huai-Xin SHI You-Guo LI jian-Qi Department of Physics Xiaogan University Xiaogan 432100 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics The Chinese Academy of Sciences Beijing 100080 China

Structural and thermal transitions in the materials with nominal compositions of NaxCoO2 （0.5≤x≤0.75） have been investigated from room temperature to 800 K. In-situ heating transmission electron microscopy observations revealed certain distinctive structural phase transitions commonly existing in this system. A superstructure hexagonal phase, proposed arising from partial Na ordering, appears in this system in a high temperature range. The structural model for the superstructure phase has been given. Measurements of thermogravimetry （TG） and differential thermal analysis （DTA） demonstrated that certain structural phase transitions appear around 430 K. NaxCoO2 is decomposed at a temperature higher than 600 K.

关键词： NaxCoO2 phase transition superstructure