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2011 1st Middle East Conference on Biomedical engineering, MECBME 2011

作者： Hosseini, M. Parsa Soltanian-Zadeh, Hamid Akhlaghpoor, Shahram Department of Electrical Engineering Islamic Azad University Science and Research Branch of Tehran Tehran Iran Image Analysis Laboratory Department of Radiology Henry Ford Health System Detroit MI United States Department of Radiology Tehran University of Medical Sciences Sina Hospital Tehran Iran Control and Intelligent Processing Center of Excellence School of Electrical and Computer Engineering University of Tehran Tehran Iran

ISBN: (纸本)9781424470006

Chronic obstructive pulmonary disease (COPD) is a devastating disease. In this paper, we propose a novel method for scoring of air trapping in the lungs for detection and evaluation of COPD. The proposed method finds volumetric changes of the lungs from inspiration to expiration. To this end, trachea CT images at full inspiration and expiration are compared. For this comparison, the lungs parenchyma in the inspiration and expiration images are found and changes in the surface and volume of the lungs between inspiration and expiration are used to define quantitative measures (features). Using these features, the subjects are classified into two groups of normal class and COPD patients using a Bayesian classifier. In addition, t-tests are applied to evaluate discrimination powers of the features for this classification. The main advantage of the proposed method is its ability to estimate air trapping in the lungs from CT images without human intervention. The proposed method may assists radiologists in the detection of COPD as a computer aided diagnosis (CAD) system. It may also assist them with the scoring of the disease (severity of air trapping in the lungs). © 2011 IEEE.

关键词： computerized tomography

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Study of EMS statements production and dispatcher simulation training for regional smart grid

Study of EMS statements production and dispatcher simulation...

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2011 International Conference on Information and Automation, ICIA 2011

作者： Zhang, Xilin Zhang, Fan Han, Xiaojuan Wang, Shuo Dispatching Center Changchun Power Supply Company Changchun 130012 China Developing and Planning Department Zhejiang Electric Company Hangzhou China Department of Control and Computer Engineering North China Electrical Power University Beijing 102206 China Transformation Controlled Company Jilin Electric Power Transmission Engineering Corporation Changchun 130012 China

ISBN: (纸本)9781457702686

From the characteristics in regional grid, the connotation of smart grid and the change of regulation and control integrated management after meeting the requirement of operating monitoring and scheduling management in regional smart grid, statements production of EMS and simulation training of dispatcher in the region smart grid were discussed in this paper. © 2011 IEEE.

关键词： Smart power grids

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Synergistic Lyapunov functions and backstepping hybrid feedbacks

Synergistic Lyapunov functions and backstepping hybrid feedb...

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2011 American control Conference (ACC)

作者： Christopher G. Mayhew Ricardo G. Sanfelice Andrew R. Teel Robert Bosch Limited Liability Company Palo Alto CA USA Department of AeroSpace and Mechanical Engineering University of Arizona Tucson Tucson AZ USA Center for Control Engineering and Computation Electrical and Computer Engineering Department University of California Santa Barbara CA USA

The notion of synergistic potential functions has been introduced recently in the literature and has been used as the basis for the design of hybrid feedback laws that achieve global asymptotic stabilization of a point on a compact manifold (without boundary) such as S~(1), S~(2), and SO(3). Here, synergistic potential functions are generalized--to synergistic Lyapunov functions--and are shown to be amenable to backstepping. In particular, if an affine control system admits a (weak) synergistic Lyapunov function and feedback pair then the system with an integrator added at the input also admits a synergistic Lyapunov and feedback pair. This fact enables "smoothing" hybrid feedbacks, or implementing them through a chain of integrators. In this way, hybrid control designed at a kinematic level can be redesigned for control through forces, torques, or even the derivative of these quantities. We demonstrate the backstepping procedure for attitude stabilization of a rigid body using a quaternion parametrization.

关键词： Lyapunov methods Backstepping control systems Asymptotic stability Time domain analysis Quaternions Electric potential

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On the Non-Robustness of Inconsistent Quaternion-Based Attitude control Systems using Memoryless Path-Lifting Schemes

On the Non-Robustness of Inconsistent Quaternion-Based Attit...

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2011 American control Conference (ACC)

The unit quaternion is a pervasive representation of rigid-body attitude used for the design and analysis of feedback control laws. Quaternion-based feedback control laws that are inconsistent (i.e. do not have a unique value for a given attitude) require an additional mechanism that lifts a continuous attitude trajectory to the unit quaternion space. Lifting mechanisms that are memoryless, for example, selecting the quaternion having positive scalar component, have a limited domain where they remain injective and, when used globally, introduce discontinuities into the closed-loop system. We show that such discontinuities can be exploited by an arbitrarily small measurement disturbance to stabilize attitudes far from the desired attitude and destroy "global" attractivity properties.

关键词： Quaternions Attitude control Manifolds Aerospace electronics Kinematics Feedback control Trajectory

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On Quaternion-Based Attitude control and the Unwinding Phenomenon

On Quaternion-Based Attitude Control and the Unwinding Pheno...

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American control Conference

作者： Christopher G. Mayhew Ricardo G. Sanfelice Andrew R. Teel Robert Bosch Research and Technology Center 4005 Miranda Ave. Palo Alto CA 94304 Department of Aerospace and Mechanical Engineering University of Arizona Tucson AZ 85721 Center for Control Engineering and Computation Electrical and Computer Engineering Department University of California Santa Barbara CA 93106-9560

ISBN: (纸本)9781457700811;9781457700804

The unit quaternion is a pervasive representation of rigid-body attitude used for the design and analysis of feedback control laws. Often, quaternion-based feedbacks require an additional mechanism that lifts a continuous attitude path to the unit quaternion space. When this mechanism is memoryless, it has a limited domain where it remains injective and leads to discontinuities when used globally. To remedy this limitation, we propose a hybrid-dynamic algorithm for lifting a continuous attitude path to the unit quaternion space. We show that this hybrid-dynamic mechanism allows us to directly translate quaternion-based controllers and their asymptotic stability properties (obtained in the unit-quaternion space) to the actual rigid-body-attitude space. We also show that when quaternion-based controllers are not designed to account for the double covering of the rigid-body-attitude space by a unit-quaternion parameterization, they can give rise to the unwinding phenomenon, which we characterize in terms of the projection of asymptotically stable sets.

关键词： attitude control Unwinding Quaternion lifts attitude in space Injective Human Posture controllers Attitude

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Superiority of the 3rd order approximation model to the 2nd order in Diffusion Kurtosis Imaging

Superiority of the 3rd order approximation model to the 2nd ...

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作者： Iraji, Armin Davoodi-Bojd, Esmaeil Soltanian-Zadeh, Hamid Hossein-Zadeh, Gholam-Ali Control and Intelligent Processing Center of Excellence School of Electrical and Computer Engineering University of Tehran Tehran 14395-515 Iran Image Analysis Laboratory Radiology Department Henry Ford Hospital Detroit MI 48202 United States

ISBN: (纸本)9789644634284

For estimating the kurtosis parameter in Diffusion Kurtosis Imaging (DKI), usually second order expansion of the diffusion signal is used in conventional acquisition data. However, in this work, we show that this is not sufficient and should be reconsidered. Instead of using the second order expansion, we propose to use the third order expansion. At first, we show that the third order term of the Taylor's expansion has considerable values compared to second and first terms for the conventional b-values used in DKI. Then, for proving our claim empirically, we use real data to compare the proposed model with the previous one. To this end, five regions of the brain are extracted and for each region the fitting errors of both models are computed. The results confirm that the fitting error of the third order model is always (for all regions) less than the second order model. Although the improvement of the fitting error seems to be small, but considering the sensitivity analysis, this improvement can enhance the estimation of kurtosis. The resulting maps of the kurtosis parameter show this enhancement. The white matter in the map of third order model is more distinguishable than in the other model. © 2011 AmirKabir Univ of Tech.

关键词： Diffusion

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Multiplicative fault estimation for a type of nonlinear uncertain system

Multiplicative fault estimation for a type of nonlinear unce...

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作者： Gao, Chunyan Zhao, Qing Duan, Guang-Ren Department of Electrical and Computer Engineering University of Alberta Edmonton AB T6G 2V4 Canada Center for Control Theory and Guidance Technology Harbin Institute of Technology Harbin 150001 China

ISBN: (纸本)9789881725592

This paper investigates the parameter estimation problem for a type of nonlinear system with multiplicative component faults and model uncertainties. Multiplicative faults are parameter changes within a process. Model uncertainties can be treated as an unknown input by appropriate transformation. An adaptive observer is proposed to estimate the multiplicative faults which are affected by system states and inputs. The component faults triggering oscillatory failures are considered. The proposed design is applied to a hydraulic rig model to verify its effectiveness. © 2011 Chinese Assoc of Automati.

关键词： Uncertainty analysis

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Local Quantum Transformations Requiring Infinite Rounds of Classical Communication

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Physical Review Letters 2011年第19期107卷 190502-190502页

作者： Eric Chitambar Center for Quantum Information and Quantum Control (CQIQC) Department of Physics and Department of Electrical & Computer Engineering University of Toronto Toronto Ontario M5S 3G4 Canada

In this Letter, we investigate the number of measurement and communication rounds needed to implement certain tasks by local quantum operations and classical communication (LOCC), a relatively unexplored topic. To demonstrate the possible strong dependence on the round number, we consider the problem of converting three-qubit entanglement into two-qubit form, specifically in the random distillation setting of [Phys. Rev. Lett. 98, 260501 (2007)]. We find that the number of LOCC rounds needed for a transformation can depend on the amount of entanglement distilled. In fact, for a wide range of transformations, the required number of rounds is infinite (unbounded). This represents the first concrete example of a task needing an infinite number of rounds to implement.

关键词： COMMUNICATION QUBITS DISTILLATION INFORMATION processing DISTANCES PROBABILITY theory

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Randomly distilling W-class states into general configurations of two-party entanglement

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Physical Review A 2011年第5期84卷 052301-052301页

作者： Wei Cui Eric Chitambar Hoi-Kwong Lo []Center for Quantum Information and Quantum Control (CQIQC) Department of Physics and Department of Electrical & Computer Engineering University of Toronto Toronto Ontario M5S 3G4 Canada

In this article we obtain results for the task of converting a single N-qubit W-class state (of the form x0|00...0〉+x1|10...0〉+⋯+xN|00...1〉) into maximum entanglement shared between two random parties. Previous studies in random distillation have not considered how the particular choice of target pairs affects the transformation, and here we develop a strategy for distilling into general configurations of target pairs. We completely solve the problem of determining the optimal distillation probability for all three-qubit configurations and most four-qubit configurations when x0=0. Our proof involves deriving new entanglement monotones defined on the set of four-qubit W-class states. As an additional application of our results, we present new upper bounds for converting a generic W-class state into the standard W state |WN〉=1N(|10...0〉+⋯+|00...1〉).

关键词： QUANTUM optics QUANTUM entanglement QUANTUM information science QUANTUM communication MANY-body problem

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Effect of Respiratory Modulation on Relationship between Heart Rate Variability and Motion Sickness

Effect of Respiratory Modulation on Relationship between Hea...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society

作者： Chin-Teng Lin Chun-Ling Lin Tzai-Wen Chiu Jeng-Ren Duann Tzyy-Ping Jung Institute of Electrical Control Engineering and Brain Research Center National Chiao-Tung University Department of Biological Science and Technology National Chiao-Tung University Institute for Neural Computation University of California Institute for Neural Computation and Institute of Engineering in Medicine University of California

ISBN: (纸本)9781424441211

This study investigates the interplay among heart rate variability (HRV), respiration, and the severity of motion sickness (MS) in a realistic passive driving task. Although HRV is a commonly used metrically in physiological research or even believed to be a direct measure of sympathovagal activities, the results of MS-effected HRV remain mixed across studies. The goal of this study is to find the source of these contradicting results of HRV associated with MS. Experimental results of this study showed that the group trend of the low-frequency (LF) component and the LF/HF ratio increased and high-frequency (HF) component decreased significantly as self-reported MS level increased (p<0.001), consistent with a perception-driven autonomic response of the cardiovascular system. However, in one of the subjects, the relationship was reversed when individuals intentionally adjust themselves (deep breathing) to relieve the discomfort of MS during the experiments. It appears that the correlations between HRV and MS level were higher when individuals made fewer adjustments (the number of deep breathing) during the passive driving experiments.

关键词： Heart rate variability Correlation Hafnium Electrocardiography Educational institutions Switches Physiology

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