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Design and Simulation of Contour mode MEMS Resonator on Si for Power Converters

Design and Simulation of Contour mode MEMS Resonator on Si f...

引用

IEEE Workshop on Control and Modeling for Power Electronics

作者： Abusaleh M. Imtiaz Faisal H. Khan Power Electronics and Automation Research Lab (PEARL) Dept. of Electrical and Computer Engineering Univ. of Utah

ISBN: (纸本)9781467349154

Microelectromechanical systems (MEMS) resonators on Si have the potential to replace the discrete passive components in a power converter. These devices not only can reduce the size and weight of the converter but also can facilitate the implementation of power converter on a chip. In this paper, a contour mode MEMS resonator has been presented that can achieve resonant frequency in the range of several MHz, and the operating principles of the device have been discussed in detail. This device was simulated in COMSOL Multiphysics, and a resonant converter has been simulated in PSIM to harvest energy from a thermo electric generator. The equivalent electrical model of the MEMS resonator was incorporated into that circuit validating the feasibility of using MEMS resonator in power conversion systems. Detailed fabrication process of the device has been presented and implemented at University of Utah's Nanofab. Initial experimental characteristics of the resonator have been included in the paper.

关键词： power conversion unit Resonator Device Component Microelectromechanical systems Silicon Converters simulating POWER CONVERSION SYSTEM resonant converter operating principles Energy sources frequency ranges contour Fabrication process resonant frequencies

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State Space Modeling and Performance Analysis of a Multilevel Modular Switched-Capacitor Converter using Pulse Dropping Switching Technique

State Space Modeling and Performance Analysis of a Multileve...

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Annual IEEE Applied Power Electronics Conference and Exposition

作者： Mohammed Khorshed Alam Faisal H. Khan Power Engineering and Automation Research Lab (PEARL) Dept. of Electrical and Computer Engineering University of Utah Salt Lake City Utah USA

ISBN: (纸本)9781467343541

Multilevel modular capacitor clamped dc-to-dc converter (MMCCC) is a two-phase modular switched capacitor converter. The conversion ratio of an ideal MMCCC is an integer and depends on the number of active modules. An MMCCC circuit can achieve fractional conversion ratios by varying the operating frequency or using the pulse dropping technique (PDT). Using PDT, the converter remains at the same state for longer time duration depending on the required conversion ratio needed. Therefore, PDT adds an additional degree of freedom to achieve variable conversion ratio at a constant frequency. Practical performance of switched-capacitor voltage regulator circuits are generally analyzed by measuring the equivalent output resistance of the converter at different frequencies. State space modeling technique has been used in this paper for measuring the equivalent output resistance when pulse dropping technique has been applied to MMCCC circuit. This analysis will define the boundaries of the PDT operation needed to achieve continuous conversion ratio, and the constraints on the output load resistance needed to achieve the required dynamic range of conversion ratio has been discussed as well. Detail of the state space modeling has been provided in this paper. Finally, the equivalent output resistance derived using the presented model has been validated using simulation and experimental results.

关键词： MMCCC PDT State

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Lung cancer pathology discrimination techniques using time series analysis

Lung cancer pathology discrimination techniques using time s...

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IEEE International Workshop on Imaging Systems and Techniques (IST)

作者： T. Farrahi G. Giakos T. Quang S. Shrestha A. Deshpande C. Narayan D. A. Karras Dept. of Electrical and Computer Engineering The University of Akron Akron Ohio USA Dept. of Biomedical Engineering The University of Akron Akron Ohio USA Dept. of Automation Sterea Hellas Institute of Technology Chalkis Greece Greece

The goal of this study is to discover, analyze, compare, and interpret diffused reflectance polarimetric signatures from lung cancer cells through time series analysis techniques, by using recently invented efficient polarimetric backscattering detection techniques. Specifically, different time series analyses, relying on linear and generalized linear modeling, have been investigated, with special emphasis on the Granger test for the time series. The experimental results indicate that statistically enhanced discrimination between normal and different types of lung cancer cells and stages can be achieved based on the pairwise comparisons of the time series diffused reflectance signal intensities and depolarization properties of the cells.

关键词： Lungs Cancer Autoregressive processes Time series analysis Correlation Histograms Reflectivity

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Bipolar Excitation for Double Three-phase Full Bridge Converter based Three-Phase Switched Reluctance Motor Drive System

Bipolar Excitation for Double Three-phase Full Bridge Conver...

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Annual Conference of the IEEE Industrial Electronics Society

作者： K. Tungpimolrut S. Kachapornkul P. Jitkreeyarn P. Somsiri N. Chayopitak C. Akira Advanced Automation and Electronics Research Unit National Electronics and Computer Technology Center Dept. of Electrical and Electronics Engineering Tokyo Institute of Technology

ISBN: (纸本)9781479902255

This paper propose a torque performance improving method for the bipolar excitation using the commercial three-phase full bridge converter based Switched Reluctance Motor (SRM) motor drive system. In order to control the current in each phase more flexible without any coupled effect among phases, the 2 units or double standard three-phase full-bridge power modules are used. The concept of current command with superimposed DC offset for the bipolar excitation scheme of those double standard three-phase full-bridge converter bases SRM drive system is proposed for torque performance improvement. The relation between the current and generating torque based on the proposed excitation scheme and power circuit configuration is analyzed, and the condition for the maximum average torque is also determined. The proposed method is verified on 1.5 kW, 3-phase 6/4 pole SRM.

关键词： Switched Reluctance Motors Three-phase full bridge converter Bipolar excitation Torque capacity

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PV GROUND-FAULT DETECTION USING SPREAD SPECTRUM TIME DOMAIN REFLECTOMETRY (SSTDR)

PV GROUND-FAULT DETECTION USING SPREAD SPECTRUM TIME DOMAIN ...

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IEEE Energy Conversion Congress and Exposition

作者： Mohammed Khorshed Alam Faisal Khan Jay Johnson Jack Flicker Power Engineering and Automation Research Lab (PEARL) Dept. of Electrical and Computer Engineering University of Utah Salt Lake City Utah USA Sandia National Laboratories Albuquerque NM USA

ISBN: (数字)9781479903368

ISBN: (纸本)9781479903375

A PV ground-fault detection technique using spread spectrum time domain reflectometry (SSTDR) method has been introduced in this paper. SSTDR is a reflectometry method that has been commercially used for detecting aircraft wire faults. Unlike other fault detection schemes for a PV system, ground fault detection using SSTDR does not depend on the amplitude of fault-current and highly immune to noise signals. Therefore, SSTDR can be used in the absence of the solar irradiation as well. The proposed PV ground fault detection technique has been tested in a real-world PV system and it has been observed that PV ground fault can be detected confidently by comparing autocorrelation values generated using SSTDR. The difference in the autocorrelation peaks before and after a ground-fault in the PV system are significantly higher than the threshold set for ground-fault detection.

关键词： detection confidently generated Polydnaviridae Defect detection Earth faults SPREAD SPECTRUM fault currents time domain reflectometry inspection technique Autocorrelation solar radiation Solar Irradiance

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Using agents in virtual environments to assist controllers to manage multiple assets

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1st International Workshop on Cognitive Agents for Virtual Environments, CAVE 2012, Held at AAMAS 2012

作者： Beer, Martin D. Alboul, Lyuba Norling, Emma Wallis, Peter Communication and Computing Research Centre Faculty of Arts Computing Engineering and Sciences Sheffield Hallam University Sheffield United Kingdom Centre for Automation and Robotics Research Faculty of Arts Computing Engineering and Sciences Sheffield Hallam University Sheffield United Kingdom Centre for Policy Modelling Manchester Metropolitan University Manchester United Kingdom NLP Group Dept. of Computer Science University of Sheffield Sheffield United Kingdom

ISBN: (纸本)9783642364433

Search and rescue operations often require complex coordination of a range of resources, including human and robotic resources. This paper discusses a proposed new framework that allows agent technology to be used in conjunction with a virtual environment to provide a human controller with an effective visualisation of the distribution of a collection of autonomous objects, in our case, Unmanned Aerial Vehicles (UAVs) so that they can be managed in a way that allows them to successfully complete the task in the minimum possible time. It is our contention that to do this effectively there needs to be two-way initiation of verbal conversations, but that it is not necessary for the system to completely understand the conversations required. An example scenario is presented that illustrates how such a system would be used in practice, illustrating how a single human can communicate with a swarm of semi-autonomous actors verbally and envisage their activities in a swarm based on the visual cues provided within the virtual environment. An agent-based solution is proposed that meets the requirements and provides a command station that can manage a search using a collection of UAVs effectively. © 2013 Springer-Verlag.

关键词： Virtual reality

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An algebraic approach for robust fault detection of input-output elastodynamic distributed parameter systems

An algebraic approach for robust fault detection of input-ou...

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European Control Conference (ECC)

作者： Riccardo M. G. Ferrari Thomas Parisini Marios M. Polycarpou Danieli Automation S.p.A. Buttrio Italy Imperial College London (UK) and University of Trieste (I) Dept. of Electrical and Computer Engineering University of Cyprus Nicosia Cyprus

ISBN: (纸本)9781479901890

This paper deals with the problem of designing a robust fault detection methodology for a class of input-output, uncertain dynamical distributed parameter systems, namely mechanical elastodynamic systems, which are representative of a whole class of problems related to on-line health monitoring of mechanical and civil engineering structures. The proposed approach does not require full state measurements and is robust to measuring, modeling and numerical errors, thanks to a time varying detection threshold. In order to avoid the problems associated with classical discretization techniques for distributed parameter systems, which can lead to numerical errors difficult to bound a priori, and thus higher thresholds, a suitable structure-preserving algebraic approach, called Cell Method, will be employed. This method consists in writing the equations of a distributed parameter system directly in discrete form, avoiding the usual discretization process and leading to a symplectic, that is energy preserving, numerical scheme.

关键词： Equations Fault detection Elastodynamics Mathematical model Distributed parameter systems Numerical models Robustness

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Distributed Fault Detection for Uncertain Nonlinear Systems: a Network Delay Compensation Strategy

Distributed Fault Detection for Uncertain Nonlinear Systems:...

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American Control Conference

作者： Francesca Boem Riccardo M. G. Ferrari Thomas Parisini Marios M. Polycarpou University of Trieste Italy. Danieli Automation S.p.A. Buttrio Italy. Dept. of Electrical and Electronic Engineering at the Imperial College London UK KIOS Research Center for Intelligent Systems and Networks Dept. of Electrical and Computer Engineering University of Cyprus Nicosia 1678 Cyprus.

ISBN: (纸本)9781479901777

This paper proposes a delay compensation strategy for a distributed fault detection architecture, allowing to manage delays and packet losses in the communication network between the Local Fault Diagnosers. A novel consensus-based estimator with time-varying weights is introduced, permitting to improve detectability in the case of variables shared among more than one subsystem. In the consensus protocol, at each step each agent uses only the information given by the agent and the communication link which are more reliable at that time. The convergence of the proposed estimator is demonstrated and analytical conditions for detectability are derived.

关键词： Network Delay Compensation Strategy manage delays packet losses Packet loss Fault zones detectability Telecommunication links networks(communications) Agents Defect detection network delay Uncertain nonlinear system time varying

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TRANSFER FUNCTION MAPPING FOR A GRID CONNECTED PV SYSTEM USING REVERSE SYNTHESIS TECHNIQUE

TRANSFER FUNCTION MAPPING FOR A GRID CONNECTED PV SYSTEM USI...

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IEEE Workshop on Control and Modeling for Power Electronics

作者： Mohammed Khorshed Alam Faisal H. Khan Power Engineering and Automation Research Lab (PEARL) Dept. of Electrical and Computer Engineering University of Utah

ISBN: (纸本)9781467349154

Mathematical modeling of power electronic converters is a historical problem. Numerous efforts have been documented in literature to model different converter topologies and their control schemes since the 1940s. Traditional modeling approaches avoid transfer function derivation due to high degree of nonlinearity involved with the power converter's switched operation. In this paper, a simple transfer functions for a grid connected PV system is derived. First an ideal transfer function is derived from the steady state input and output relationship of ideal converters. Then, it is compared with the non-ideal model of a practical converter. Using this technique, it is possible to find generalized modules to represent a complex power converter, and it is possible to deduce new converter topologies using the reverse mapping.

关键词： Modeling Power converter Grid PV Mapping Synthesis

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MINING HETEROGENEOUS CLASS-SPECIFIC CODEBOOK FOR CATEGORICAL OBJECT DETECTION AND CLASSIFICATION

MINING HETEROGENEOUS CLASS-SPECIFIC CODEBOOK FOR CATEGORICAL...

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IEEE International Conference on Image Processing

作者： Hong Pan Yaping Zhu A. K. Qin Liangzheng Xia School of Automation Southeast University Nanjing China 210096 Dept. of Communication Engineering Communication University of China Beijing China 100024 School of Computer Science and Information Technology RMIT University Melbourne 3001 Australia

ISBN: (纸本)9781479923427

We propose a novel model to mine and derive class-specific codebook for categorical object detection and classification. In particular, the codebook is built from a pool of heterogeneous local descriptors using an effective feature selection scheme. The resulting class-specific codebook strengthens the class discriminability by learning the most discriminative part codewords constructed from their preferable local descriptors. The advantage of our class-specific codebook comes from two aspects. 1). As we collect a variety of heterogeneous descriptors during the learning of local codebook, each target object class can always be represented by its most preferable descriptors. Moreover, even each part codeword can also find its suitable descriptors. 2). The feature selection process further picks out the most discriminative object parts that separate the target object class from background and other classes. Experimental results on several widely used datasets show that benefits from our class-specific object codebook which fuses complementary visual cues remarkably improve the detection and classification performance for both rigid and non-rigid articulated objects.

关键词： Object detection Feature selection Class-specific codebook Heterogeneous descriptors Object detection Feature extraction codebook object class Subject Headings Descriptors Taxonomy

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