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Modeling nonlinear medical ultrasound via a linearized contrast source method

Modeling nonlinear medical ultrasound via a linearized contr...

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作者： Demi, L. Verweij, M.D. De Jong, N. Van Dongen, K.W.A. Laboratory of Acoustical Imaging and Sound Control Faculty of Applied Sciences Delft University of Technology Netherlands Laboratory of Electromagnetic Research Faculty of Electrical Engineering Mathematics and Computer Science Delft University of Technology Netherlands Laboratory of Experimental Echocardiography Erasmus Medical Center Rotterdam Netherlands

ISBN: (纸本)9781457703829

Research on nonlinear medical ultrasound has been increased over the last decade and has resulted in a wide range of numerical methods for the modeling of the nonlinear distortion of a propagating pressure wave. However, when applied to realistic configurations, the majority of these methods are either computationally expensive or limited by the applied approximations. The Iterative Nonlinear Contrast Source (INCS) method is able to accurately compute the pulsed nonlinear pressure wave field that is generated in a large three-dimensional domain by an arbitrary transducer transmitting under a large steering angle. The method is based on the Neumann iterative solution of a nonlinear integral equation that is equivalent to the Westervelt equation. To improve the performance of the method, it would be beneficial to employ iterative schemes (e.g. Conjugate Gradient based schemes) that are efficient for solving linear integral equations. This motivates the development of a linearized version of the INCS method, as presented in this paper. To test the presented approach, a Bi-CGSTAB scheme is used to solve the linearized Westervelt equation. For the one-dimensional case, results are obtained and compared with the solution obtained with the original INCS method, and the Fubini solution. All the results have been obtained up to the third harmonic component and are in agreement with each other. © 2010 IEEE.

关键词： Numerical methods

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Modeling nonlinear acoustic wave fields in media with inhomogeneity in the attenuation and in the nonlinearity

Modeling nonlinear acoustic wave fields in media with inhomo...

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ISBN: (纸本)9781457703829

Biomedical tissues usually show inhomogeneity in their acoustic medium parameters. These inhomogeneities cause refraction and scattering of diagnostic and therapeutic ultrasound waves. A method that is able to model the effects of inhomogeneity in the attenuation and in the nonlinearity is essential for the design of transducers for new ultrasound modalities and the development of novel ultrasound applications. The Iterative Nonlinear Contrast Source (INCS) method has originally been designed for the accurate modeling of nonlinear acoustic wave fields in homogeneous media. It considers the nonlinear term from the Westervelt equation as a distributed contrast source, and the corresponding integral equation is solved using an iterative Neumann scheme. This paper presents an extension of the INCS method that can handle inhomogeneity in the attenuation and in the coefficient of nonlinearity. Results are presented for the one-dimensional case. These show that in this case the presented method correctly predicts the effects related to nonlinear propagation and scattering by inhomogeneities in the attenuation and the coefficient of non-linearity. © 2010 IEEE.

关键词： Integral equations

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Prototype design and realization of an innovative energy efficient transfemoral prosthesis

Prototype design and realization of an innovative energy eff...

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IEEE/RAS-EMBS International Conference on Biomedical Robotics and Biomechatronics (BioRob)

作者： R. Unal S.M. Behrens R. Carloni E.E.G. Hekman S. Stramigioli H.F.J.M. Koopman Biomechanical Engineering Faculty of Engineering Technology University of Twente Netherlands Control Engineering Faculty of Electrical Engineering Mathematics and Computer Science University of Twente Netherlands

In this paper, we present the prototype realization of the conceptual design of a fully-passive transfemoral prosthesis. The working principle has been inspired by the power flow in human gait so to achieve an energy efficient device. The main goal of this paper is to validate the concept by implementing in a real prototype. The prototype, in scale 1 : 2 with respect to the average dimensions of an adult human, is based on two storage elements, which are responsible for the energetic coupling between the knee and ankle joints during the swing phase and for the energy storage during the stance phase. The design parameters of the prototype are determined according to the human body and the energetic characteristics of the gait. The construction of the prototype is explained in details together with a test setup that has been built to evaluate the prototype.

关键词： Joints Prototypes Knee Springs Foot Humans Prosthetics

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A framework for the integration of MOF-compliant analysis methods 10

A framework for the integration of MOF-compliant analysis me...

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Proceedings of the Second Asia-Pacific Symposium on Internetware

作者： Chen, Xiangping Huang, Gang Chauvel, Franck Sun, Yanchun Mei, Hong Institute of Advanced Technology Sun Yat-sen University Guangzhou 510006 China Research Institute of Sun Yat-sen University in Shenzhen Shenzhen 518057 China Shenzhen Key Laboratory of Digital Living Network and Content Service Shenzhen 518057 China Key Laboratory of High Confidence Software Technologies Ministry of Education Beijing 100871 China Institute of Software School of Electronics Engineering and Computer Science Peking University Beijing 100871 China

ISBN: (纸本)9781450306942

With the increasing maturity of model-driven tools and methods, new model-based analysis methods are developed to support specific stakeholder concerns during software lifecycle. This multiplication of models and their related analysis tools calls for solution addressing the integration of MOF-based analysis methods. Current research works on integration of analysis methods have already addressed the extraction of the needed input data as well as the control and the integration of the tools supporting the analysis execution. However, little attention has been paid to the integration of analysis results back into initial model. We propose a MOF-based framework enabling the integration of analysis results that a) defines a meta-model capturing the integration requirements, b) provides a MOF metamodel extension mechanism with support for upward compatibility;and c) automatically generates a model transformation for model integration. We illustrate the use of our framework by integrating a reliability analysis methods and a fault tolerant reconfiguration method on the ABC/ADL Software Architecture. We applied the resulting analysis composition onto the ECPerf JEE system.

关键词： Integration

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Noninvasive biosignal measurement of a subject in bed using ceramic sensors

Noninvasive biosignal measurement of a subject in bed using ...

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SICE Annual Conference

作者： Toshihiro Shino Kajiro Watanabe Kazuyuki Kobayashi Kaoru Suzuki Yosuke Kurihara System Control Engineering Department Faculty of Engineering Hosei University Koganei Tokyo Japan Department of Computer and Information Science Faculty of Science and Technology Seikei University Musashino Tokyo Japan

This paper describes a novel noninvasive method for sensing heartbeat, respiration and body-movement biosignals of a subject in bed by using ceramic piezo devices set under the legs of the bed.

ISBN: (纸本)9781424476428

This paper describes a novel noninvasive method for sensing heartbeat, respiration and body-movement biosignals of a subject in bed by using ceramic piezo devices set under the legs of the bed.

关键词： Heart beat Ceramics Leg Sensor phenomena and characterization Microphones Turning

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control of hydraulic turbine generators using exact feedback linearization

Control of hydraulic turbine generators using exact feedback...

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2010 8th IEEE International Conference on control and Automation, ICCA 2010

作者： Yang, Fang Lei, Hao Sun, Yuanzhang Lin, Wei Shen, Tielong Dept. of Electrical Engineering Tsinghua University Beijing 100084 China Dept. of Electrical Engineering and Computer Science Case Western Reserve University Cleveland OH 44106 United States Alstom Power Inc. Windsor CT United States Harbin Institue of Technology Shenzhen Graduate School China Dept. of Mechanical Engineering Faculty of Science and Technology Sophia University Kioicho 7-1 Chiyoda-ku Tokyo 102-8554 Japan

ISBN: (纸本)9781424451951

Feedback control of hydro turbines in power systems is important for the transient stability enhancement. However, the hydro-electric power system is hard to be controlled due to its inherent non-minimum phase property. While global control of such a non-minimum phase system remains a challenging problem, it is shown in this paper that locally, the hydro-electric power plant is feedback equivalent to a linear and controllable system, and hence can be locally controlled, in the new coordinates, by using a linear feedback design technique such as pole assignment. Simulation results in a single machine infinite bus system are provided to illustrate the effectiveness of the proposed nonlinear control scheme. Performance comparisons between a PID controller and the nonlinear controller are also given in the paper. © 2010 IEEE.

关键词： controllers

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A new watershed algorithm for protein spot detection in 2DGE images using the notion of fuzzy relations

A new watershed algorithm for protein spot detection in 2DGE...

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International Conference on computer technology and Development (ICCTD)

作者： Shaheera Rashwan Talaat Faheem Amany Sarhan Bayumy A.B. Youssef Informatics Research Institute Mubarak City of Science and Technology Alexandria Egypt Computer Science and Automatic Control Department Faculty of Engineering Tanta University Tanta Egypt

An important issue in the analysis of two-dimensional electrophoresis images is the detection and quantification of protein spots. The main challenges in the segmentation of 2DGE images are to separate overlapping protein spots correctly and to find the abundance of weak protein spots. To enable comparison of protein patterns between different samples, it is necessary to match the patterns so that homologous spots are identified. In this paper we describe a new robust technique to segment and model the different spots present in the gels. The watershed segmentation algorithm is modified to handle the problem of over segmentation by initially partitioning the image to mosaic regions using the composition of fuzzy relations. The experimental results showed the effectiveness of the proposed algorithm to overcome the over segmentation problem associated with the available algorithms.

关键词： Image segmentation Zinc Databases Pixel

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Multiscale Gaussian Markov Random Fields for writer identification

Multiscale Gaussian Markov Random Fields for writer identifi...

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International Conference on Wavelet Analysis and Pattern Recognition (ICWAPR)

作者： Liangshuo Ning Long Zhou Xinge You Liang Du Zhengyu He Department of Electrical and Information Engineering Wuhan Polytechnic University Wuhan China Faculty of Mathematics and Computer Science Hubei University Wuhan China Department of Electronics and Information Engineering Huazhong University of Science and Technology Wuhan China Department of Computer Science and Technology Shenzhen Graduate School Harbin Institute of Technology China

Writer identification recently has been considerably studied due to its various applications in forensic and commercial sections. Because offline, text-independent writer identification has limited requirements in writing sample collection, it has wider applications and meanwhile more difficult to handle. By considering handwriting images as visually distinctive textures, we propose a new method for offline, text-independent writer identification based on multiscale version of Gaussian Markov Random Fields (GMRF) model. The handwriting features are extracted in wavelet domain of handwriting textures in which global texture feature (such as directional information) from handwriting can be detected. In addition, GMRF is investigated to capture different local spatial structures of graphemes (character-shape) written by different people. The experimental results demonstrate that the proposed method outperforms both 2-D Gabor model and wavelet-based GGD method.

关键词： Variable speed drives Histograms

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Remote life monitoring system base on Internet of Things

Remote life monitoring system base on Internet of Things

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World Congress on Intelligent control and Automation (WCICA)

作者： Guan Guan Hu Chao Shen Xiao Bin Pan Ying Zi Max Q.-H. Meng Shenzhen Institutes of Advanced Technology Chinese Academy and Sciences Shenzhen Guangdong China School of Information Science and Computer Science Xiamen University Xiamen Fujian China Department of Electronic Engineering Chinese University of Hong Kong Sha Tin Hong Kong China

The system is mainly based on the Internet in the computer, use wireless data communication technologies and construct a “Internet of Things” of guardian body bio-information. This paper discusses various sensor nodes in the human body, how these nodes collected information through the wireless sensor network to relay station, the relay station pass through open computer networks to achieve information exchange and sharing, then implement the human body “guardianship” Management.

关键词： Internet Wireless sensor networks Monitoring IP networks Frequency locked loops Relays Biomedical monitoring

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Modeling Nonlinear Acoustic Wave Fields in Media with Inhomogeneity in the Attenuation and in the Nonlinearity

Modeling Nonlinear Acoustic Wave Fields in Media with Inhomo...

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2010 IEEE International Ultrasonics Symposium

作者： L. Demi M.D. Verweij N. de Jong K.W.A. van Dongen Laboratory of Acoustical Imaging and Sound Control Faculty of Applied Sciences Delft University of Technology The Netherlands Laboratory of Electromagnetic Research Faculty of Electrical Engineering Mathematics and Computer Science Delft University of Technology The Netherlands Laboratory of Experimental Echocardiography Erasmus Medical Center Rotterdam The Netherlands

ISBN: (纸本)9781457703829

关键词： Inhomogeneities nonlinearity Attenuation wave fields Attenuation Acoustic Wave Ultrasonic applications Scattering Ultrasonic Therapy

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