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Adaptive input-output feedback linearization controller for doubly-fed induction machine drive

Adaptive input-output feedback linearization controller for ...

引用

International Aegean Conference on Electrical Machines and Power electronics, ACEMP

作者： A. Farrokh Payam B. Mirzaeian Dehkordi M. Moallem Faculty of Electrical & Computer Engineering University of Tehran Tehran Iran Department of Electronics Faculty of Engineering Isfahan University of Technology Isfahan Iran

In this paper a nonlinear controller is presented for doubly-fed induction machine (DFIM) drives. The nonlinear controller is designed based on adaptive input-output feedback linearization control technique, using the fifth order model of induction machine in fixed stator d, q axis reference frames with stator currents and rotor flux components as state variables. The nonlinear controller can perfectly track the torque and flux reference signals inspite of stator and rotor resistance variations. Two level SVM-PWM back-to-back voltage source inverters are employed in the rotor circuit, in order to make the drive system capable of operating in the motoring and generating modes below and above synchronous speed. computer simulation results obtained, confirm the effectiveness and validity of the proposed control approach.

关键词： Programmable control Adaptive control Linear feedback control systems Induction machines Stators Rotors State feedback Torque control Voltage Inverters

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Measurements of matching and high count rate performance of multichannel ASIC for digital X-ray imaging systems

Measurements of matching and high count rate performance of ...

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作者： Grybos, Pawel Maj, Piotr Ramello, Luciano Swientek, Krzysztof IEEE Faculty of Electrical Engineering Automatics Computer Science and Electronics Department of Measurement and Instrumentation AGH University of Science and Technology 30-059 Cracow Poland Dipartamento di Scienze e Tecnologie Avanzate Universita del Piemonte Orientale INFN 15100 Alessandria Italy Faculty of Physics and Applied Computer Science AGH University of Science and Technology 30-059 Cracow Poland

We present the measurements of matching and high count rate performance of a 64 channel readout ASIC called DEDIX for high count rate position-sensitive measurements using semiconductor detectors. The ASIC is designed in 0.35 μm CMOS process and its total area is 3900 × 5000 μm2. The DEDIX has a binary readout architecture. Each channel is built of a charge sensitive amplifier (CSA) with a pole-zero cancellation circuit, a shaper, two independent discriminators and two independent 20-bit counters. The size of the input device in CSA has been optimized for a detector capacitance in the range of 1-3 pF per strip. An equivalent noise charge of 110 el rms has been achieved for a total detector capacitance of 1 pF at the shaper peaking time of 160 ns. Internal correction DAC implemented in each channel independently ensures a low spread of discriminator effective threshold, namely 0.4 mV at one sigma level. The mean gain in the multichannel ASIC is 54 μV/el, with a good uniformity from channel-to-channel (sd/mean 0.8%). Low noise performance and high rate capability have been demonstrated by the measurement up to and above 1 MHz average rate of input signals. © 2007 IEEE.

关键词： Image matching

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An image watermarking scheme using non-tensor wavelets

An image watermarking scheme using non-tensor wavelets

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2007 International Conference on Wavelet Analysis and Pattern Recognition, ICWAPR '07

作者： Qingyan, He Xinge, You Wang, Patrick S. Yuanyuan, Tang Faculty of Mathematics and Computer Science Hubei University Wuhan China Department of Electronics and Information Engineering Huazhong University of Science and Technology Wuhan China College of Computer and Information Science Northeastern University Boston MA United States Department of Computer Science Hong Kong Baptist University Hong Kong Hong Kong

ISBN: (纸本)1424410665

Watermarking plays a significant role in copyright protection. In this paper, a new method of digital watermarking is proposed based on a new non-tensor bivariate wavelet filter banks with linear phase, which are constructed from the centrally symmetric matrices. Our investigation demonstrates that the constructed non-tensor product bivariate wavelet filters have the following desirable properties, namely, its corresponding wavelet transform can detect more singularities of the host image with reflecting whole orientation while only three orientations being considered by traditional discrete separable transform(DWT). For this reason, details are given more in middle and high frequency, the imperceptible and robust requirements of watermarks are fulfilled and optimized. Some experiments with detailed comparisons with DWT are carried out. Experiments are conducted and positive results are achieved, which show that the proposed watermarking scheme is applicable to the gray image, and the watermark is robust against noise, compression, scaling, cropping and sharpening. © 2007 IEEE.

关键词： Discrete wavelet transforms

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Crosstalk Analysis of Simultaneously Switching Inductively and Capacitively Coupled Interconnects Driven by CMOS Gate

Crosstalk Analysis of Simultaneously Switching Inductively a...

引用

International Conference on Emerging Technologies, ICET

作者： B. K. Kaushik S. Sarkar R. P. Agarwal R. C. Joshi Department of Electronics and Computer Engineering Indian Institute of Technology-Roorkee Roorkee INDIA Faculty of Engineering and Technology Mody Institute of Technology and Science-Sikar INDIA

ISBN: (纸本)1424414935

This paper deals in waveform analysis, crosstalk peak and delay estimation of a CMOS gate driven capacitively and inductively coupled interconnect for simultaneously switching inputs. A transmission line based coupled model of interconnect is used for analysis. Peaks and delays at far-end of victim line are estimated for the conditions when the inputs to two coupled interconnects are switching in-phase and out-of-phase. Waveforms are analyzed in general with homogeneous and non-homogeneous drivers for unipolar inputs. Alpha Power Law model of MOS-transistor is used to represent the transistors in CMOS-driver. The comparison of analytically obtained results with SPICE simulations show that the proposed model captures noise peak and their timing; 90% propagation delay; transition time delay and waveform shape with good accuracy.

关键词： Crosstalk Couplings Delay estimation Power transmission lines Semiconductor device modeling Coupled mode analysis Driver circuits SPICE Analytical models Noise shaping

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Consideration on addressing in ubiquitous space using fuzzy measure

Consideration on addressing in ubiquitous space using fuzzy ...

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IEEE International Conference on Systems, Man and Cybernetics

作者： Tomoyuki Araki Makoto Fujiwara Yuichi Kohira Department of Electronics and Computer Engineering Faculty of Engineering Hiroshima Institute of Technology Hiroshima Japan Graduate School of Engineering Hiroshima Institute of Technology Hiroshima Japan

Recently many studies on ubiquitous computing have been done. In the studies, ubiquitous ID architecture is one of the most important ones. In this study, we propose a new method for connecting to objects with RFTDs through the Internet. At first, we introduce a simple application called "Portable Environment Communicator". We try to apply the proposed method to it. Second, we propose a new name resolver architecture for portable objects, and a new method for selecting the most appropriate wireless base station around the objects, which is connected to the Internet. In the paper, the selection method is carried out using the supper arrangement method, distance field space model, and fuzzy measure theory.

关键词： Extraterrestrial measurements Radiofrequency identification Base stations Databases Internet IP networks Paper technology Ubiquitous computing Watches Vents

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Crosstalk Analysis of Simultaneously Switching Coupled Interconnects Driven by Unipolar Inputs through Heterogeneous Resistive Drivers

Crosstalk Analysis of Simultaneously Switching Coupled Inter...

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International Conference on Emerging Technologies, ICET

作者： B. K. Kaushik S. Sarkar R. P. Agarwal R. C. Joshi E'lDepartment of Electronics and Computer Engineering Indian Institute of Technology Roorkee Roorkee India Faculty of Engineering and Technology Mody Institute of Technology and Science-Sikar India

ISBN: (纸本)9781424414932

This paper focuses on waveform analysis and crosstalk peak estimation at far-end of victim line for simultaneously switching inputs with resistive drivers. A transmission line based low loss coupled ALC-model of interconnect is used for analytical purpose. Positive and negative peaks are estimated for the conditions when inputs to two coupled interconnects are switching in-phase and out-of-phase. Waveforms are analyzed in general with homogeneous and non-homogeneous drivers for unipolar inputs. The driver is modeled as linear resistance. Comparison of analytical results with SPICE extracted results shows that the error involved is less than 2% and 5% for in-phase and out-of- phase switching respectively. The comparisons of analytically obtained results with SPICE simulations show that the proposed model captures noise peaks and waveform shape quite well.

关键词： Crosstalk Integrated circuit interconnections Signal design Driver circuits SPICE Artificial intelligence Couplings Analytical models Transient analysis Delay

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Application of neural network to one-day-ahead 24 hours generating power forecasting for photovoltaic system

Application of neural network to one-day-ahead 24 hours gene...

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2007 International Conference on Intelligent Systems Applications to Power Systems, ISAP

作者： Yona, Atsushi Senjyu, Tomonobu Saber, Ahmed Yousuf Funabashi, Toshihisa Sekine, Hideomi Kim, Chul-Hwan IEEE Department of Electrical and Electronics Engineering Faculty of Engineering University of the Ryukyus Okinawa Japan Toyota Technological Institute Aichi Japan Meidensha Corporation Tokyo Japan Department of Education Technology University of the Ryukyus Okinawa Japan School of Electrical and Computer Engineering Sungkyunkwan University Suwon City 440-746 Korea Republic of NPT Center

ISBN: (纸本)9860130868

In recent years, introduction of an alternative energy source such as solar energy is expected. However, insolation is not constant and output of photovoltaic (PV) system is influenced by meteorological conditions. In order to predict the power output for PV system as accurate as possible, it requires method of insolation estimation. In this paper, the authors take the insolation of each month into consideration, and confirm the validity of using neural network to predict one-day-ahead 24 hours insolation by computer simulations. The proposed method in this paper does not require complicated calculation and mathematical model with only meteorological data.

关键词： Forecasting

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Using linguistics information for improving the sentence-based semantic relatedness measurement

Using linguistics information for improving the sentence-bas...

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International Symposium on Communications and Information Technologies (ISCIT)

作者： Rachada Kongkachandra Kosin Chamnongthai Department of Computer Science Faculty of Science and Technology Thammasat University Pathum Thani Thailand Department of Electronics and Telecommunication Engineering Faculty of Engineering King Mongkut''s University of Technology Bangkok Thailand

This paper presents a method to measure the semantic relatedness between sentences by using conceptual graph. To compare the sentence meaning, we firstly convert an English sentence into a conceptual graph. Then we employ the conceptual graph operations to match two conceptual graphs of one sentence and another. In matching nodes in the conceptual graphs, we utilize two lexicons i.e. WordNet and VerbNet. All semantic relatedness of contents in concept nodes are computed by using WordNet. The VerbNet is another used to find the semantic relatedness of contents in conceptual relation nodes. By our specified rules, the semantic relatedness between two sentences are objectively scored. We evaluate the performance of the proposed measurement with "Microsoft Research Paraphrase Corpus". The experimental results show the % correctness as 80.00% compared to human judgment. Moreover, we apply the measurement with words sense ambiguity analysis, the proposed measurement yields 76.44% of correctness compared to human judgment.

关键词： Information technology

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MISAT: Designing a series of powerful small satellites based upon micro systems technology

MISAT: Designing a series of powerful small satellites based...

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58th International Astronautical Congress 2007

作者： Gill, E. Monna, G.L.E. Scherpen, J.M.A. Verhoeven, C.J.M. Faculty Aerospace Engineering Delft University of Technology Kluyverweg 1 2629 HS Delft Netherlands SystematlC Design B.V. Motorenweg 5G 2623 CR Delft Netherlands University of Groningen Nijenborgh 4 9747 AG Groningen Netherlands Department of Electronics Faculty Electrical Engineering Mathematics and Computer Science Delft University of Technology Mekelweg 4 2628 CD Delft Netherlands

ISBN: (纸本)9781605601502

MISAT is a research and development cluster which will create a small satellite platform based on Micro Systems technology (MST) aiming at innovative space as well as terrestrial applications. MISAT is part of the Dutch MicroNed program which has established a microsystems infrastructure to fully exploit the MST knowledge chain involving public and industrial partners alike. The cluster covers MST-related developments for the spacecraft bus and payload, as well as the satellite architecture. Particular emphasis is given to distributed systems in space to fully exploit the potential of miniaturization for future mission concepts. Examples of current developments are wireless sensor and actuator networks with plug and play characteristics, autonomous digital Sun sensors, re-configurable radio front ends with minimum power consumption, or micro-machined electrostatic accelerometer and gradiometer system for scientific research in fundamental physics as well as geophysics. As a result of MISAT, a first nano-satellite will be launched in 2007 to demonstrate the next generation of Sun sensors, power subsystems and satellite architecture technology. Rapid access to in-orbit technology demonstration and verification will be provided by a series of small satellites. This will include a formation flying mission, which will increasingly rely on MISAT technology to improve functionality and reduce size, mass and power for advanced technology demonstration and novel scientific applications. Copyright IAF/IAA. All rights reserved.

关键词： Network architecture

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Kernelized Fuzzy c-means Method in Fast Segmentation of Demyelination Plaques in Multiple Sclerosis

Kernelized Fuzzy c-means Method in Fast Segmentation of Demy...

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29th Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBS 2007), vol.14

作者： Jacek Kawa Ewa Pietka Faculty of Automatic Control Electronics and Computer Science Department of Biomedical Engineering Gliwic Silesian University of Technology Gliwice Poland

Fuzzy c-means method (FCM) is a popular tool for a fuzzy data processing. In the current study, a FCM-based method of fuzzy clustering in a kernel space has been implemented. First, a "kernel trick" is applied to the fuzzy c-means algorithm. Then, the new method is employed for a fast automated segmentation of demyelination plaques in Multiple Sclerosis (MS). The clusters in a Gaussian kernel space are analysed in the histogram context and used during the initial classification of the brain tissue. Received classification masks are then used to detect the region of interest, eliminate false positives and label MS lesions.

关键词： Multiple sclerosis Kernel Clustering algorithms Image segmentation Prototypes Partitioning algorithms Lesions Magnetic resonance imaging Fuzzy sets Data processing

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