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Solvability of unilateral parabolic problems and variational inequalities

Journal of Mathematical Sciences 2005年第5期127卷 2284-2314页

作者： Solonukha, O.V.

Sufficient conditions are given for the existence of solutions of strong parabolic variational inequalities with nonlinear and multi-valued operators. Pseudomonotone operators are used. A new multi-valued analogue of the acute-angle lemma is used for the localization. The theory can be applied to problems with distributed parameters. We also consider conditions for the existence of strong generalized solutions of parabolic equations with unilateral boundary conditions with applications to control problems. © 2005 Springer Science+Business Media, Inc.

关键词： Lemma Sufficient conditions inequalities parabolic equations distributed parameter nonlinearity computability

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Adaptive Predictive Control of Through-flow Heat Exchanger

Adaptive Predictive Control of Through-flow Heat Exchanger

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18th Annual International Mediterranean Conference on Control and Automation (MED)

作者： Chalupa, Petr Bobal, Vladimir Kubalcik, Marek Novak, Jakub Tomas Bata Univ Zlin Fac Appl Informat Zlin 76005 Czech Republic

ISBN: (纸本)9781424480920

Heat exchange belongs to the class of basic thermal processes which occur in a range of industrial technologies, particularly in the energetic and chemical industry. The process of heat exchange is often implemented by through-flow heat exchangers. It is apparent that for an exact theoretical description of dynamics of heat exchange processes it is necessary to use partial differential equations. Heat exchange is namely a process with distributed parameters. It is also necessary to take into account its nonlinear and stochastic character. In spite of these facts, most of thermal equipment is controlled by digital modifications of PID controllers at present. This paper deals with identification of a static behaviour of a through-flow heat exchanger and a design of an adaptive predictive controller for its control. The proposed adaptive predictive controller was verified by a real-time control of Multifunction Process Control Teaching System (MPCTS) - the Armfield PCT 40.

关键词： Heat transfer Heat exchange Adaptive predictive control small flow heat exchangers PARALLEL FLOW HEAT EXCHANGERS through flow Predictive controllers heat exchangers thermal equipment static characteristics distributed parameter Proportional Integral Derivative Control Real time control Necessary

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The Influence of Heating Temperature on Alignment Precision in Thermosonic Flip-chip Bonding

The Influence of Heating Temperature on Alignment Precision ...

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International Conference on Electronic Packaging Technology and High Density Packaging

作者： Zhang Li-na Han Lei Cent S Univ Changsha 410083 Peoples R China

ISBN: (纸本)9781424427390

According to the fact that heating will affect the image collection, target identification and track, so it will affect the alignment precision of the chips and substrates in the process of chips package. Sequence images were collected through the thermosonic flip-chip bonder under the different heating temperature, their parameters distribute regulation of translation, scale rotation under the influence of the temperature were respectively studied by phase correlation algorithm and 6-parameter affine model hierarchical search algorithm. The distributions of these parameters are highly random and nonlinear. To improve the algorithm speed, a hierarchical search algorithm based on the pyramid was adopted. By Statistical Analysis of the experimental results, it indicated that the higher the temperature, the higher the dispersion degree of translation, scale, rotation. So the temperature effects can not be ignored in thermosonic flip-chip bonding.

关键词： alignment accuracy heating temperature SEARCHING ALGORITHM Flip chip bonding Microassembly temperature effects Statistical methods Statistical analysis distributed parameter

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Risk-based Intelligent Software Release Planning

Risk-based Intelligent Software Release Planning

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IEEE 9th International Conference on Ubiquitous Intelligence and Computing (UIC) / IEEE 9th International Conference on Autonomic and Trusted Computing (ATC)

作者： Tokumoto, Shunsuke Dohi, Tadashi Hiroshima Univ Dept Informat Engn Higashihiroshima 7398527 Japan

ISBN: (纸本)9780769548432;9781467330848

The bootstrapping is a sophisticate statistical technique to duplicate the data itself by resampling the underlying population data, and enables us to investigate the statistical properties. It is useful to estimate standard errors and confidence intervals for complex estimators of complex parameters of the distribution from a small number of data. In this paper, we apply the bootstrapping techniques to the software release problems and propose the flexible decision making by taking account of uncertainty. More precisely, we derive interval estimates of the optimal software release times and their associated cost criteria. Based on the maximum likelihood estimation of parametric models such as the so-called exponential non-homogeneous Poisson process (NHPP) model, we assess the probability distributions of estimators of the optimal software release timing.

关键词： software release bootstrapping maximum likelihood estimation Probability distribution distributed parameter complex parameter Estimators Population statistics alphameric data Confidence intervals

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Performance of Negative Sequence Pilot Protection Applications in Transmission Line with Open-Phase Operation

Performance of Negative Sequence Pilot Protection Applicatio...

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Transmission and Distribution Conference and Exposition - Asia and Pacific

作者： Wang, Bin Dong, Xinzhou Bo, Zhiqian Klimek, Andrew Tsinghua Univ Dept Elect Engn State Key Lab Control & Simulat Power Syst & Gene Beijing 100084 Peoples R China AREVA T&D UK Ltd Stafford ST1 4LX England

ISBN: (纸本)9781424452293

The performance of the Negative Sequence Pilot Protection (NSPP) is less deteriorated by the phase-ground shunt capacitance since the negative sequence current loops in phase-phase lines. Hence NSPP is a good candidate for the main protection in UHV lines with the special characteristic of larger charging current. But as we all known, NSPP is not suit to the open-phase operations in transmission line, which limited its wide applications in HV/EHV lines in history. In response to this question, the performance of NSPP in transmission line with open-phase operation is analyzed, and the mal-operation reason of the NSPP relay is discovered. Then an improved algorithm for faults detection is proposed in open-phase line, and the simulation results verified its validity. The work in this paper is only the basic steps, the more research, such as the sensitivity and transient characteristics of ground fault detections in open-phase line should be discussed further.

关键词： UHV Negative sequence pilot protection Shunt capacitance distributed parameter

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Temperature Modeling and Simulation of the Asphaltic Emulsion in an Industrial Tank

Temperature Modeling and Simulation of the Asphaltic Emulsio...

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9th IEEE International Symposium on Applied Computational Intelligence and Informatics (SACI)

作者： Muresan, Vlad Abrudean, Mihail Colosi, Tiberiu Tech Univ Cluj Napoca Automat Dept Cluj Napoca Romania

ISBN: (纸本)9781479946945

In this paper, a solution for the modeling-simulation of the temperature propagation phenomenon in the asphaltic emulsion from an industrial tank is presented. The heating process of the asphaltic emulsion is a distributed parameter one, its model being expressed using a partial differential equation. The modeling-simulation procedure is based on the matrix of partial derivatives of the state vector (Mpdx) associated with Taylor series. Some suggestive 2D and 3D graphical representations are presented in order to show the temperature distribution inside the tank. Also, a solution for the designing of the emulsion's temperature control system is proposed in the end of the paper.

关键词： Tanks Graphic methods modeling and simulation PROCESS HEAT Temperature distribution Taylor series Industrial distributed parameter

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Relative Stability Assessment for Wideband Harmonic Resonances in distributed Generation Power Plants 45

Relative Stability Assessment for Wideband Harmonic Resonanc...

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45th Annual Conference of the IEEE Industrial Electronics Society (IECON)

作者： Chen, Zhiyong Luo, An Huang, Xucheng Xiangtan Univ Coll Informat Engn Xiangtan Peoples R China Hunan Univ Coll Elect & Informat Enineering Changsha Peoples R China

ISBN: (纸本)9781728148786

For assessing the influence of feeder's distributed parameter on the grid-connected current which is emitted by distributed generation power plants (DGPP), hyperbolic function should be introduced in the process of feeder modeling. However, the Taylor approximation of the hyperbolic function makes the Norton equivalent of the DGPP possess a certain number of poles in the right-half s plane. This pole configuration violates the impedance-based stability criterion to be applied. To this end, we proposed equivalently transforming the hyperbolic function via Euler's formula. The advantage of this transformation includes the following two aspects: 1) it could establish the direct correlation between time-domain eigenvalues and system frequencies;2) it enables us to assess the relative stability of systems in terms of pole-zero method. By using the proposed Euler's formula-based stability-analysis approach, we found that: 1) the underlying causes of the wideband harmonic resonances correlated with the motion patterns of the eigenvalues on the s plane;2) with the system frequencies increasing, the frequencies of the arc resonance peaks exactly corresponded to the frequencies which made the dominant pole traverse the negative real axis in the s plane from top to bottom.

关键词： distributed parameter pole-zero cancellation power quality relative stability renewable energy generation

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A Signal Model for Forensic DNA Mixtures 48

A Signal Model for Forensic DNA Mixtures

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48h Asilomar Conference on Signals, Systems and Computers

作者： Moenich, Ullrich J. Grgicak, Catherine Cadambe, Viveck Wu, Jason Yonglin Wellner, Genevieve Duffy, Ken Medard, Muriel MIT Elect Res Lab Cambridge MA 02139 USA Boston Univ Sch Med Biomed Forens Sci Boston MA 02215 USA Penn State Univ Dept Elect Engn University Pk PA 16802 USA Natl Univ Ireland Maynooth Hamilton Inst Maynooth Kildare Ireland

ISBN: (纸本)9781479982974

For forensic purposes, short tandem repeat allele signals are used as DNA fingerprints. The interpretation of signals measured from samples has traditionally been conducted by applying thresholding. More quantitative approaches have recently been developed, but not for the purposes of identifying an appropriate signal model. By analyzing data from 643 single person samples, we develop such a signal model. Three standard classes of two-parameter distributions, one symmetric (normal) and two right-skewed (gamma and log-normal), were investigated for their ability to adequately describe the data. Our analysis suggests that additive noise is well modeled via the log-normal distribution class and that variability in peak heights is well described by the gamma distribution class. This is a crucial step towards the development of principled techniques for mixed sample signal deconvolution.

关键词： signals distributed parameter ANALYTICAL DATA Additive noise Single Person DNA log normal distribution Gamma Distribution DNA Fingerprinting mixtures Microsatellite Repeats

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Determination of service life of hydraulic turbine water wheels with allowance for scattering of fatigue characteristics

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Power Technology and Engineering 2005年第2期39卷 84-88页

作者： Domozhirov, L.I. GNTs TsNIITMASh Federal State Unitary Enterprise Moscow Russian Federation

1. The method for plotting fatigue curves with the use of approaches offracture mechanics makes it possible to determine the parameters of the distribution of fatigueresistance in a corrosive medium for large test bases (N = 10~8 - 10~9 cycles) at a small number oftested specimens and limited number of loading cycles. 2. The endurance of steel 06Kh12N3DL issusceptible ti scattering, which increases substantially with decrease in the load. For example, forspecimens with cross section of 180 x 200 mm at σ = 140 MPa the endurance ranges within 3.6 x 10~5and 8.9 x 10~5 cycles, i.e., changes by a factor of 2.5, whereas the endurance at σ = 40 MParanges within 1.6 x 10~(-7) and 9.3 x 10~8 cycles, i.e. changes by a factor of 58 times. 3. In thedetermination of the service life of water wheels exceeding 10~8 cycles it is more important toallow for the scattering of the endurance than to amend the form of the fatigue curve. 4. Thepresented examples of strength computation reflect the close connection between the strength loadfactor and the parameters of distribution of the characteristics of fatigue resistance and thenecessity for data on the scattering of fatigue resistance parameters and their use for determiningand substantiating the service life of water wheels with allowance for modern requirements onreliability and safety of engineering systems of enhanced danger.

关键词： Fatigue turbines allowance service life FATIGUE RESISTANCE distributed parameter Hydrodynamics water wheel Fatigue properties fatigue curve CORROSIVE MEDIA Endurance load drop

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Frequency Effect on Calculation for Voltage Distribution of Winding

Frequency Effect on Calculation for Voltage Distribution of ...

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General Meeting of the IEEE-Power-and-Energy-Society

作者： Zhao, Chun Ruan, Jiangjun Ruan, Ling Du, Zhiye Chen, Liang Yu, Shifeng Wuhan Univ Sch Elect Engn Wuhan 430072 Hubei Peoples R China Hubei Elect Power Testing & Res Inst Wuhan Hubei Peoples R China

ISBN: (纸本)9781424442409

This paper models simplified transformer winding model by multi-conductor transmission line (MTL) model. Because inductance and resistance of transformer winding are frequency-dependent parameters, frequency effect on parameters should be considered when calculating distributed parameter matrices. Then, when solving for voltage distribution of winding model, the distributed parameter matrices should be selected according to the frequency of signal source. Because of frequency change, voltage distribution of winding model changes very significantly. This phenomenon can he verified by accurate experiment.

关键词： distributed parameter Experiment Frequency Effect Finite Element Method Inductance Multi-Conductor Transmission Line Partial Discharge Resistance Voltage Distribution and Winding

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