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67th Annual Technical Conference of the Society of Plastics Engineers 2009, ANTEC 2009

作者： Kong, Xiangsong Chen, Xi Shao, Zhijiang State Key Lab of Industrial Control Technology Department of Control Science and Engineering Zhejiang University Hangzhou 310027 China

ISBN: (纸本)9781615673278

Quality requirements of injection molding parts have become more and more stringent. Part weight is one of the most important quality characteristics. A model free optimization method based on the simultaneous perturbation stochastic approximation (SPSA) method is presented for the weight control of injection molded parts. The experimental results using different materials show that this model free optimization method is effective for the part weight control.

关键词： Stochastic systems

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Classification of tea based on terahertz time domain spectroscopy

Classification of tea based on terahertz time domain spectro...

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Photonics and Optoelectronics Meetings (POEM) 2008: Terahertz science and technology

作者： Binghua, Cao Guangxin, Zhang Zekui, Zhou State Key Lab. of Industrial Control Technology Department of Control Science and Engineering Zhejiang University Hangzhou 310027 China

ISBN: (纸本)9780819475367

Terahertz time-domain spectroscopy (THz-TDS) is a newly developed technique in the last decade. A new method to classify tea is proposed based on THz-TDS and pattern recognition method. Four kinds of tea are investigated to study its feasibility. Their absorption spectra are measured using the THz-TDS system. Then a pattern recognition method, support vector machine (SVM), is employed to differentiate the investigated tea based on their terahertz data. The absorption spectra between 0.2 and 2.0 THz of the investigated tea samples are selected as the feature to classify them. The correct rate of recognition for the SVM classifier is 96.88%. The results give evidence that different tea varieties can be distinguished based on their terahertz spectra. In this respect, the spectral method provides enough information to differentiate different kinds of tea. © 2009 SPIE.

关键词： Terahertz spectroscopy

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Research of heat dissipation of RGB-LED acklighting system on LCD

Research of heat dissipation of RGB-LED acklighting system o...

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2009 7th IEEE International Conference on industrial Informatics, INDIN 2009

作者： Shao, Xumin Cai, Yong Li, Huadong Wu, Mingguang State Key Lab. of Industrial Control Technology Department of Control Science and Engineering Zhejiang University Hangzhou Zhejiang China

ISBN: (纸本)9781424437603

Heat dissipation is a very important subject during the design of RGB-LED backlighting system on LCD because the heat produced by modern LEDs themselves can excessively influence their characteristics. This paper reports on a new substrate technology that offers significant benefits over conventional polymer-based insulated metal substrates (IMS). This new type of insulated aluminum substrate printed circuit board (PCB) consists of a thermally-conductive aluminum alloy substrate that insulated by a thin, chemically grown, anodized dielectric layer. Circuit is formed above the anodized layer with magnetron sputtering technology. The corresponding thermal resistances of the new and conventional insulated metal substrate printed circuit board (PCB) are measured to be 4.78 /W and 7.61/W, respectively. More heat transfer means more reliable product, less light reduction and less material consumption because of eliminating the need for additional heat sinks. © 2009 IEEE.

关键词： Printed circuit boards

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A new method for the online voidage measurement of the gas-oil two-phase flow

A new method for the online voidage measurement of the gas-o...

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作者： Li, Xia Huang, Zhiyao Wang, Baoliang Li, Haiqing State Key Laboratory of Industrial Control Technology Department of Control Science and Engineering Zhejiang University Hangzhou 310027 China

Based on the capacitances obtained from a 12-electrode electrical capacitance tomography (ECT) system and the least-squares support vector machine (LS-SVM) technique, a new method is proposed for the online voidage measurement of the gas-oil two-phase flow. In the practical voidage-measurement process, the real-time flow pattern of the gas-oil two-phase flow is directly identified from 66 capacitances obtained from the ECT system. Then, according to the flow pattern-identification results, a suitable measurement model is selected, and the voidage value is calculated. Both static and dynamic experimental results show that the proposed method is effective. The voidage-measurement result is independent of the flow pattern, and the real-time performance is satisfactory. Meanwhile, compared with the conventional voidage-measurement method based on an ECT system, the proposed method can produce more accurate voidage measurement without going through an image-reconstruction process. © 2008 IEEE.

关键词： Capacitance

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An integrated multifunction DC/DC converter for PV generation systems

An integrated multifunction DC/DC converter for PV generatio...

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IEEE International Symposium on industrial Electronics (ISIE)

作者： Lin Ma Kai Sun Remus Teodorescu Josep M. Guerrero Xinmin Jin Department of Energy Technology Aalborg University Aalborg Denmark School of Electrical Engineering Beijing Jiao Tong University Beijing China State Key Lab of Power Systems Tsinghua University Beijing China Dept. of Automatic Control Systems and Computer Engineering Universitat Politecnica de Catalunya Barcelona Spain

Due to the stochastic characteristic of photovoltaic (PV) generation, energy storage devices are indispensable to smooth the power flow and provide the electric energy with high quality. In this paper, an integrated DC/DC converter is proposed to realize high performance interfaces for PV array, battery and load. This converter consists of a boost converter for the PV array and a buck/boost converter for the battery, which can realize multifunction including power generation, charge and discharge. The grid-connected and stand-alone operation modes of this converter are analyzed. From this analysis, the control strategies are developed for both modes. A coordination scheme is proposed for the power balance at the stand-alone mode. Simulation and experiments verify the practical feasibility and effectiveness of this multi-function converter.

关键词： Batteries Arrays DC-DC power converters Voltage control Inverters Load flow

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Solid volume fraction measurement of gas-solid two-phase flow based on terahertz time-domain spectroscopy technique: A preliminary study and static experimental results

Solid volume fraction measurement of gas-solid two-phase flo...

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作者： Liu, Yian Huang, Zhiyao Ji, Haifeng Li, Haiqing State Key Laboratory of Industrial Control Technology Department of Control Science and Engineering Zhejiang University Hangzhou 310027 China

Recent advances in terahertz wave sources and detectors have resulted in a wide range of applications of the terahertz technique. In this paper, the feasibility of using the terahertz technique for the measurement of gas-solid two-phase flows is reported. Static experimental studies were carried out on a terahertz time-domain spectroscopy (THz-TDS) system to assess the use of the terahertz technique for solid volume fraction measurement of gas-solid two-phase flows with a high concentration of particles. Measurement models based on transmission attenuation and transmission time delay are developed and compared. Meanwhile, the effects of particle size and particle material on the measurement are examined. Results indicate that the terahertz technique may provide a new solution to the problem of high-solid-volume-fraction measurement of gas-solid two-phase flows. Experimental results also suggest that the transmission time delay model is more appropriate than the transmission attenuation model in the measurement of solid volume fraction with a high concentration of particles. © 2008 IEEE.

关键词： Particle size

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Oil-water two-phase flow measurement based on a hybrid flowmeter and dominant phase identification

Oil-water two-phase flow measurement based on a hybrid flowm...

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2009 IEEE Intrumentation and Measurement technology Conference, I2MTC 2009

作者： Huang, Zhiyao Li, Xia Ji, Haifeng Wang, Baoliang Li, Haiqing State Key Laboratory of Industrial Control Technology Department of Control Science and Engineering Zhejiang University Hangzhou 310027 China

ISBN: (纸本)9781424433537

Based on a hybrid flowmeter and a dominant phase identifier, a new system is proposed for oil-water two-phase flow measurement. The hybrid flowmeter consists of an oval gear flowmeter and a Venturi meter. The dominant phase identifier is utilized to overcome the influence of oil fraction on the measurement results. In the practical measurement process, the total volume flowrate and the differential pressure of the twophase flow are firstly obtained by the oval gear flowmeter and the Venturi meter, respectively. Meanwhile, the dominant phase of the oil-water two-phase flow is identified. Then the meter coefficient of the Venturi meter is selected according to the dominant phase identification result. Finally, the total volume flowrate and the total mass flowrate of the two-phase flow are obtained. The preliminary research results show that the proposed system is effective in measuring oil-water two-phase flow. © 2009 IEEE.

关键词： Flowmeters

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Research on Community Structure in Bus Transport Networks

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Communications in Theoretical Physics 2009年第12期52卷 1025-1030页

作者： YANG Xu-Hua WANG Bo SUN You-Xian College of Information Engineering Zhejiang University of Technology Hangzhou 310032 China State Key Laboratory of Industrial Control Technology Zhejiang University Hangzhou 310027 China Department of Computer Science and Engineering Yiwu Industrial and Commercial College Yiwu 322000 China

We abstract the bus transport networks(BTNs)to two kinds of complex networks with space L and spaceP methods *** improved community detecting algorithm(PKM agglomerative algorithm),we analyzethe community property of two kinds of BTNs *** results show that the BTNs graph described with space Lmethod have obvious community property,but the other kind of BTNs graph described with space P method have *** reason is that the BTNs graph described with space P method have the intense overlapping community propertyand general community division algorithms can not identify this kind of community *** overcome this problem,we propose a novel community structure called N-depth community and present a corresponding community detectingalgorithm,which can detect overlapping *** the novel community structure and detecting algorithmto a BTN evolution model described with space P,whose network property agrees well with real BTNs',we get obviouscommunity property.

关键词： bus transport network overlapping community structure clique modularity N-depth community

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Kernel matrix learning with a general regularized risk functional criterion

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Journal of Systems engineering and Electronics 2010年第1期000卷

作者： Chengqun Wang1 Jiming Chen1 Chonghai Hu2 and Youxian Sun1 1. state key laboratory of industrial control technology department control science and engineering Zhejiang University Hangzhou 310027 P. R. China 2. department of Mathematics Zhejiang University Hangzhou 310027 P. R. China State Key Laboratory of Industrial Control Technology Department Control Science and EngineeringZhejiang UniversityHangzhou 310027P.R.China Department of Mathematics Zhejiang UniversityHangzhou 310027P. R. China

Kernel-based methods work by embedding the data into a feature space and then searching linear hypothesis among the embedding data points. The performance is mostly affected by which kernel is used. A promising way is to learn the kernel from the data automatically. A general regularized risk functional (RRF) criterion for kernel matrix learning is proposed. Compared with the RRF criterion, general RRF criterion takes into account the geometric distributions of the embedding data points. It is proven that the distance between different geometric distributions can be estimated by their centroid distance in the reproducing kernel Hilbert space. Using this criterion for kernel matrix learning leads to a convex quadratically constrained quadratic programming (QCQP) problem. For several commonly used loss functions, their mathematical formulations are given. Experiment results on a collection of benchmark data sets demonstrate the effectiveness of the proposed method.

关键词： kernel method support vector machine kernel matdx learning HKRS geometric distribution regularized risk functional criterion

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Modeling of cortical signals using echo state networks

Modeling of cortical signals using echo state networks

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MIPPR 2009 - Pattern Recognition and Computer Vision: 6th International Symposium on Multispectral Image Processing and Pattern Recognition

作者： Zhou, Hanying Wang, Yongji Huang, Jiangshuai Key Lab. for Image Processing and Intelligent Control Department of Control Science and Engineering Huazhong University of Science and Technology China

ISBN: (纸本)9780819478078

Diverse modeling frameworks have been utilized with the ultimate goal of translating brain cortical signals into prediction of visible behavior. The inputs to these models are usually multidimensional neural recordings collected from relevant regions of a monkey's brain while the outputs are the associated behavior which is typically the 2-D or 3-D hand position of a primate. Here our task is to set up a proper model in order to figure out the move trajectories by input the neural signals which are simultaneously collected in the experiment. In this paper, we propose to use Echo state Networks (ESN) to map the neural firing activities into hand positions. ESN is a newly developed recurrent neural network(RNN) model. Besides its dynamic property and short term memory just as other recurrent neural networks have, it has a special echo state property which endows it with the ability to model nonlinear dynamic systems powerfully. What distinguished it from transitional recurrent neural networks most significantly is its special learning method. In this paper we train this net with a refined version of its typical training method and get a better model. © 2009 Copyright SPIE - The International Society for Optical engineering.

关键词： Brain

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