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Virtual Plate Based Controlling Strategy of Toy Play for Robot s Communication Development in JA Space

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International Journal of Automation and computing 2019年第1期16卷 93-101页

作者： Wei Wang Xiao-dan huang School of Information and Electrical Engineering Hebei University of Engineering

Toy play is a basic skill for a humanoid robot after it has joint attention(JA) ability. Because such skill is helpful for human-robot interaction and cooperation, we must realize this skill to enhance the robots communication ability with person. In this paper, we researched a toy play controlling strategy in JA space based on a virtual plate with a serial robot arm, which has five degrees of freedom(5-DoF). For this purpose, a reachable space of joint attention was constructed firstly. And then the toy play controlling strategy was proposed in details. Here we used a virtual plate to enhance the toy play effect. In order to realize this skill better, toy play energy and some restraining relations were analyzed. By contrasting the audio waveform in the experiments, good performance effect of toy play was demonstrated.

关键词： Human robot cooperation joint attention(JA)space reachable space toy play ability a virtual plate

Control of vortex-induced vibrations of the cylinder by using split-ter plates immersed in the cylinder wake at low Reynolds number

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Journal of Hydrodynamics 2020年第5期32卷 942-952页

作者： Zhi-qiang Xin Zhi-huang Wu Chui-jie Wu dan huang The College of Mechanics and Materials HoHai UniversityNanjing 211100China State Key Laboratory of Structural Analysis for Industrial Equipment and School of Aeronautics and Astronautics Dalian University of TechnologyDalianChina

The vortex-induced vibrations of a cylinder with two plates symmetrically distributed along the centerline of the wake are studied by using the fluid-structure interaction simulations on the Arbitrary Lagrangian-Eulerian *** this study,the different geo-metrical distribution parameters of the splitter plates and inflow velocities are taken into *** physical mechanisms of vortex-induced vibration of the cylinder with symmetrical plates are revealed from the cylinder amplitude,hydrodynamic force characteristics,vortex shedding frequency,and flow pattern *** results show that the dynamic interaction between the vortex shed from the oscillation cylinder and plates is responsible for the wake stabilization mechanism,and the stable wake and the dynamic response reduction of the main cylinder can be achieved at a wide range of reduced velocities by placing sym-metrical sheets at suitable locations.

关键词： Cylinder vortex-induced vibrations splitter plates vibration control flow pattern

Reliability-based design optimization of offshore wind turbine support structures using RBF surrogate model

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Frontiers of Structural and Civil Engineering 2023年第7期17卷 1086-1099页

作者： Changhai YU Xiaolong LV dan huang Dongju JIANG Department of Engineering Mechanics Hohai UniversityNanjing 211100China

An efficient reliability-based design optimization method for the support structures of monopile offshore wind turbines is proposed ***,parametric finite element analysis(FEA)models of the support structure are established by considering stochastic ***,a surrogate model is constructed using a radial basis function(RBF)neural network to replace the time-consuming *** uncertainties of loads,material properties,key sizes of structural components,and soil properties are *** uncertainty of soil properties is characterized by the variabilities of the unit weight,friction angle,and elastic modulus of *** reliability is determined via Monte Carlo simulation,and five limit states are considered,i.e.,structural stresses,tower top displacements,mudline rotation,buckling,and natural *** on the RBF surrogate model and particle swarm optimization algorithm,an optimal design is established to minimize the *** show that the proposed method can yield an optimal design that satisfies the target reliability and that the constructed RBF surrogate model significantly improves the optimization ***,the uncertainty of soil parameters significantly affects the optimization results,and increasing the monopile diameter is a cost-effective approach to cope with the uncertainty of soil parameters.

关键词： reliability-based design optimization offshore wind turbine parametric finite element analysis RBF surrogate model uncertain soil parameter

Class Ⅰ graphs of nonnegative characteristic without special cycles

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Applied Mathematics(A Journal of Chinese Universities) 2012年第3期27卷 320-328页

作者： huang dan-jun WANG Wei-fan Department of Mathematics Zhejiang Normal UniversityJinhua 321004China

In this paper, we prove that every graph with maximum degree six that can be embedded in a surface of nonnegative characteristic is of Class I if it does not contain a 5- or 6-cycle with a chord, which extends some kn... 详细信息

关键词： graph Class I characteristic cycle.

A Motivate Mechanism for Large-Scale P2P Content Delivery System

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China Communications 2014年第A2期11卷 118-127页

作者： ZHENG Yi huang dan YANG Yansong huang Yan CHEN Changjia Network Technology Research Institute China United Network Communications Corporation Limited No. 9 Shouti Nanlu Haidian District Beijing 100048 China Network and Information Security Research Department Electronic Technology Information Research Institute MIIT No. 35 Lugu Road Shijingshan District Beijing 100040 China Tencent Research Shanghai China School of Electronic and Information Engineering Beijing Jiaotong University Beijing 100044 China

For lack of effective resource adjustment method, the supply-demand relationship of each resource in P2P content delivery system are often unbalanced. Especially after a popular content releasing, a burst of downloaders often can＇t find sufficient uploaders and their request may starve the upload capacity of server. Therefore the overall system QoS may be degraded. To tackle such issue, this paper proposes a download rate accelerate mechanism, called motivate mechanism. With it, the system can quickly find out the files becoming insufficient by monitoring the operating status of the files hourly, Then it promptly increase the number of copies of those files by using free rider nodes so that the whole system QoS is maintained and the system performance is improved. The experiment results on the practical operating system of Tencent demonstrated that the proposed mechanism increases the download rate, saves the traffic on the server and optimizes the system performance.

关键词： p2p content delivery system motivatemechanism user behaviour free-rider performanceoptimization

Dynamic modeling approach to analyze user churn in a large P2P downloading system

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The Journal of China Universities of Posts and Telecommunications 2013年第1期20卷 19-25页

作者： huang dan ZHENG Yi CHEN Chang-jia School of Electronics and Information Engineering Beijing Jiaotong University

Characterizing the features of user churn is crucial to the sustainable development of peer-to-peer （P2P） systems where peers join and leave at any arbitrary time. This paper analyzes the user churn in a P2P downloading system named QQXuanfeng by using the fine-grained log analysis over 60 days. It shows that the online and offline duration is related to up （arrive） time and down （depart） time respectively. A continuous ON/OFF process, which exhibits the diurnal patterns of users, is simulated using the churn model. In particular, the dynamic departure rate is proposed to give insight into the distribution of online duration. Further more, considering the heterogeneity of users, we cluster users based on the similarity of redefined user availability. As an example of application of this model, a high availability overlay is constructed and evaluated based on the clustering.

关键词： P2P network user chum clustering

Inhibition of PARP1 Increases IRF-dependent Gene Transcription in Jurkat Cells

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Current Medical Science 2019年第3期39卷 356-362页

作者： Cheng WANG Meng DU dan huang Kun huang Kai huang Clinic Center of Human Gene Research Union Hospital Tongji Medical College Huazhong University of Science and Technology Wuhan 430022 China Institution of Cardiology Union HospitalTongji Medical College Huazhong University of Science and Technology Wuhan 430022 China

Poly(ADP-ribose) polymerase 1 (PARP1) plays important roles in the regulation of transcription factors. Mounting evidence has shown that inhibition of PARP1 influences the expression of genes associated with inflammatory response. Interferon regulatory factor 1 (IRF1) is a critical transcription factor for the development of both the innate and adaptive immune responses against infections. However, the molecular mechanism through which PARP1 mediates the effects has not been clearly demonstrated. Jurkat cells were exposed to dexamethasone (Dex) or PARP1 inhibitor PJ34. The expression levels of IL-12, LMP2, OAS1 and PKR were detected using real-time RT-PCR. The interactions between PARP1 and IRF1 were examined by coimmunoprecipitation (co-IP) assays. We further explored the mechanism of PARP1 suppressing IRF1 by assessing the activities of interferon stimulated response element (ISRE). The mRNA expression of IL-12, LMP2, OAS1 and PKR was obviously suppressed by Dex in Jurkat cells, which could be rescued by PJ34 treatment. Luciferase study revealed that poly(ADP-ribosyl)- ation suppressed IRF1-mediated transcription through preventing the binding of IRF1 to ISREs. PARP1 inhibited IRF1-mediated transcription in Jurkat cells by preventing IRF1 binding to ISREs in the promoters of target genes. It is suggested that PARP1 is a crucial regulator of IRF1-mediated immune response. This study provides experimental evidence for the possible application of PARP1 inhibitors in the treatment of IRF1-related immune anergy.

关键词： poly(ADP-ribose) polymerase 1 interferon regulatory factor 1 Jurkat cells gene transcription interferon stimulated response element

Forecast daily indices of solar activity, F10.7, using support vector regression method

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Research in Astronomy and Astrophysics 2009年第6期9卷 694-702页

作者： Cong huang dan-dan Liu Jing-Song Wang National Center For Space Weather CMA Beijing 100081 China

The 10.7 cm solar radio flux （F10.7）, the value of the solar radio emission flux density at a wavelength of 10.7 cm, is a useful index of solar activity as a proxy for solar extreme ultraviolet radiation. It is meaningful and important to predict F10.7 values accurately for both long-term （months-years） and short-term （days） forecasting, which are often used as inputs in space weather models. This study applies a novel neural network technique, support vector regression （SVR）, to forecasting daily values of F10.7. The aim of this study is to examine the feasibility of SVR in short-term F10.7 forecasting. The approach, based on SVR, reduces the dimension of feature space in the training process by using a kernel-based learning algorithm. Thus, the complexity of the calculation becomes lower and a small amount of training data will be sufficient. The time series of F10.7 from 2002 to 2006 are employed as the data sets. The performance of the approach is estimated by calculating the norm mean square error and mean absolute percentage error. It is shown that our approach can perform well by using fewer training data points than the traditional neural network.

关键词： methods data analysis -- Sun activity -- Sun radio radiation

Simulation of Moving Bed Erosion Based on the Weakly Compressible Smoothed Particle Hydrodynamics-Discrete Element Coupling Method

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Fluid Dynamics & Materials Processing 2023年第12期19卷 2981-3005页

作者： Qingyun Zeng Mingxin Zheng dan huang School of Transportation Engineering East China Jiaotong UniversityNanchang330000China School of Architectural and Art Jiangxi Industry Polytechnic CollegeNanchang330000China

A complex interface exists between waterflow and solid particles during hydraulic soil *** this study,the particle discrete element method(DEM)has been used to simulate the hydraulic erosion of a granular soil under moving bed conditions and surrounding terrain ***,the weakly compressible smoothed particle hydrodynamics(WCSPH)approach has been exploited to simulate the instability process of the free surfacefluid and its propagation characteristics at the solid–liquid *** influence of a suspended medium on the waterflow dynamics has been characterized using the mixed viscosity concept accounting for the solid–liquid mixed particle volume *** simulations of wall-jet scouring and reservoir sedimentflushing on a mobile bed were performed and validated with *** results show that the proposed WCSPH–DEM coupling model is highly suitable for determining parameters,such as the local maximum scour depth,the scour pit width,and the sand bed *** effects on the hydraulic erosion process of two important para-meters of the mixed viscosity coefficient(initial solid volume concentration and initial viscosity coefficient)are also discussed to a certain extent in this study.

关键词： Hydraulic soil erosion WCSPH-DEM coupling model suspended medium mixed viscosity coefficient