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Tactile resonance sensors in medicine

Journal of Medical engineering and Technology 2009年第4期33卷 263-273页

作者： Lindahl, O.A. Constantinou, C.E. Eklund, A. Murayama, Y. Hallberg, P. Omata, S. Department of Computer Science and Electrical Engineering Lule University of Technology Lule Sweden Department of Urology Stanford University School of Medicine United States Biomedical Engineering and Informatics Ume University Hospital Ume Sweden College of Engineering Nihon University Koriyama Fukushima Japan Centre for Biomedical Engineering and Physics Ume University Ume Sweden

Tactile sensors in general are used for measuring the physical parameters associated with contact between sensor and object. Tactile resonance sensors in particular are based on the principle of measuring the frequency shift, f, defined as the difference between a freely vibrating sensor resonance frequency and the resonance frequency measured when the sensor makes contact to an object. f is therefore related to the acoustic impedance of the object and can be used to characterize its material properties. In medicine, tactile resonance sensor systems have been developed for the detection of cancer, human ovum fertility, eye pressure and oedema. In 1992 a Japanese research group published a paper presenting a unique phase shift circuit to facilitate resonance measurements. In this review we summarize the current state-of-the-art of tactile resonance sensors in medicine based on the phase shift circuit and discuss the relevance of the measured parameters for clinical diagnosis. Future trends and applications enabled by this technology are also predicted.

关键词： Diagnosis

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Hybrid robust observers for locally Lipschitz systems 10

Hybrid robust observers for locally Lipschitz systems

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2009 10th European Control Conference, ECC 2009

作者： Bobtsov, Alexey A. Efimov, Denis V. Department of Control Systems and Informatics Saint-Petersburg State University of Information Technologies Mechanics and Optics Kronverksky av. 49 St-Petersburg197101 Russia CCS Lab. Institute for Problems of Mechanical Engineering Bolshoi av. 61 V.O. St. Petersburg199178 Russia Systems and Modeling Department of Electrical Engineering and Computer Science Unviersité de Liège Liege Sart-TilmanB-4000 Belgium

State observer design procedure is proposed for nonlinear locally Lipschitz systems. Possible presence of disturbances is taken into account. The solution is based on logic-based control approach applicable to nonline... 详细信息

ISBN: (纸本)9783952417393

关键词： Nonlinear systems

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The comparative analysis of image restoration represented as a matrix and as a vector using feed forward neural networks

The comparative analysis of image restoration represented as...

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Optical Pattern Recognition XX

作者： Mardare, Igor Perju, Veacheslav Casasent, David Ghincul, Olga Technical University of Moldova Department of Design and Manufacturing of Electronic Apparatus Stefan cel Mare Av. 168 Chisinau MD-2012 Moldova Technical University of Moldova Department of Informatization Stefan cel Mare Av. 168 Chisinau MD-2012 Moldova Free International University of Moldova Faculty of Informatics and Engineering Vlaicu Pircalab St. 52 Chisinau MD-2004 Moldova Carnegie Mellon University Department of Electrical and Computer Engineering Pittsburgh PA 15213 United States

ISBN: (纸本)9780819476067

This work contains the results of the experiments on the restoration of the defective images proceeded in a matrix and a vector form with the help of the feed forward neural network. Sometimes it is convenient to represent an image as a vector rather than as a matrix. So the target of this work is to show experimentally what kind of input provides a better restoration, judging from the Euclid's distance of the output of a trained network. This work also shows the differences between processing different types of image presentation of the neuron network. Making a comparative analysis of a matrix and a vector form of presenting the images which are proceeded to a feed forward network allows stating some specific characteristics of a network. These characteristics include the optimal architecture of a network, the number of layers, the number of neurons in each layer and the time of an image restoration. Taking into account the network's characteristics and the most important factor - the Euclid's distance, are drawn conclusions that concern what is the best way of representing images that we want to restore using a feed forward network. © 2009 SPIE.

关键词： Image reconstruction

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Information Technology risk management in e-commerce: Classical and catastrophic risk approaches

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International Journal of Applied Systemic Studies 2009年第3期2卷 250-264页

作者： Pappas, Alexandros Panagiotopoulos, Panagiotis Department of Informatics University of Piraeus 80 Karaoli and Dimitriou St. 18534 Piraeus Greece School of Electrical and Computer Engineering National Technical University of Athens 9 Iroon Polytechniou St. 15773 Athens Greece

In the emerging global economy, e-commerce has increasingly become a strong catalyst for economic development. However, the furious pace of technological change, along with the ever increasing utilisation of critical IT assets, has also increased exposure to IT related risks. Consequently, IT risk management has become a critical part of the operation of an e-commerce organisation. The paper presents an IT risk management lifecycle for e-commerce organisations;among other suggestions, we also propose a methodology for the assessment of IT risks, which handles conditions of uncertainty, by employing both quantitative and qualitative methods, along with the execution of simulations. Copyright © 2009, Inderscience Publishers.

关键词： Risk assessment

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A fixed-order D-stability controller design with an output feedback using a modified exterior-point approach

A fixed-order D-stability controller design with an output f...

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Asian Control Conference

作者： Takeshi Terada Yasushi Kami Eitaku Nobuyama Department of the Mechanical and Electronic System Engineering Advanced Courses of Akashi National College of Technology Hyogo Japan Department of the Electrical and Computer Engineering Akashi National College of Technology Hyogo Japan Department of Systems Design and Informatics Kyushu Institute of Technology Fukuoka Japan

ISBN: (纸本)9781424454402

This paper is concerned with a D-stability controller design problem with a static or a reduced-order output feedback controller. This problem is difficult to be solved theoretically, because it consists of some bilinear matrix inequality's (BMI's). In this paper, an exterior-point approach to this problem, which produces a controller sequence approaching a feasible region from an infeasible one is proposed. The feature of our approach is to be able to use a non-stabilizing controller as an initial point of the sequence. A numerical example shows the efficiency of our approach.

关键词： Output feedback Control systems Electric variables control Linear matrix inequalities Iterative methods Educational institutions Time factors Optimization methods State feedback Systems engineering and theory

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Space mapping with adaptive response correction for microwave design optimization

Space mapping with adaptive response correction for microwav...

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作者： Koziel, Slawomir Bandler, John W. Madsen, Kaj School of Science and Engineering Reykjavík University Reykjavík IS-103 Iceland Simulation Optimization Systems Research Laboratory Department of Electrical and Computer Engineering McMaster University Hamilton ON L8S 4K1 Canada Bandler Corporation Dundas ON L9H 5E7 Canada Informatics and Mathematical Modelling Technical University of Denmark DK-2800 Lyngby Denmark

Output space mapping is a technique introduced to enhance the robustness of the space-mapping optimization process in case the space-mapped coarse model cannot provide sufficient matching with the fine model. The technique often works very well;however, in some cases it fails. Especially in the microwave area where the typical model response (e.g., |S21|) is a highly nonlinear function of the free parameter (e.g., frequency), the output spacemapping correction term may actually increase the mismatch between the surrogate and fine models for points other than the one at which the term was calculated, as in the surrogate model optimization process. In this paper, an adaptive response correction scheme is presented to work in conjunction with space-mapping optimization algorithms. This technique is designed to alleviate the difficulties of the standard output space mapping by adaptive adjustment of the response correction term according to the changes of the space-mapped coarse model response. Examples indicate the robustness of our approach. © 2009 IEEE.

关键词： Mapping

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Feasibility Conditions for Interference Alignment

Feasibility Conditions for Interference Alignment

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GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

作者： Cenk M. Yetis Tiangao Gou Syed A. Jafar Ahmet H. Kayran Informatics Institute Istanbul Technical University Maslak Istanbul Turkey Electrical Engineering and Computer Sc. University of California Irvine Irvine CA USA Department of Electronics and Communication Engineering Istanbul Technical University Maslak Istanbul Turkey

The degrees of freedom (DoF) of K-user MIMO interference networks with constant channel coefficients are not known in general. Determining the feasibility of a linear interference alignment is a key step toward solving this open problem. Our approach in this paper is to view the alignment problem for interference networks as a multivariate polynomial system and determine its solvability by comparing the number of equations and the number of variables. Consequently, we divide the interference networks into two classes proper and improper, where interference alignment is and is not achievable, respectively. An interference network is called proper if the cardinality of every subset of equations in the corresponding polynomial system is less than or equal to the number of variables involved in that subset of equations. Otherwise, it is called improper. Our intuition in this paper is that for general channel matrices, proper systems are almost surely feasible and improper systems are almost surely infeasible. We prove the direct link between proper (improper) and feasible (infeasible) systems for some important cases, thus significantly strengthening our intuition. Numerical simulation results also support our intuition.

关键词： Interference Transmitters MIMO Signal processing Equations Receiving antennas Transmitting antennas Polynomials Numerical simulation Closed-form solution

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Towards task dynamic reconfiguration over asymmetric computing platforms for UAVs surveillance systems

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Scalable Computing 2009年第3期10卷 277-289页

作者： Binotto, Alécio P.D. de Freitas, Edison P. Wehrmeister, Marco A. Pereira, Carlos E. Stork, André Larsson, Tony Fraunhofer IGD TU Darmstadt Darmstadt Germany Informatics Institute Federal University of Rio Grande do sul porto Alegre Brazil School of Information Science Computer and Electrical Engineering Halmstad University Sweden Informatics Institute Federal University of Rio Grande do Sul Porto Alegre Brazil Department of Automation and Systems Engineering Federal University of Santa Catarina Florianópolis Brazil Electrical Engineering Department Federal University of Rio Grande do Sul Porto Alegre Brazil

High-performance platforms are required by modern applications that make use of massive calculations. Actually, low-cost and high-performance specific hardware (e.g. GPU) can be a good alternative along with CPUs, which turned to multiple cores, forming powerful heterogeneous desktop execution platforms. Therefore, self-adaptive computing is a promising paradigm as it can provide flexibility to explore different computing resources, on which heterogeneous cluster can be created to improve performance on different execution scenarios. One approach is to explore run-time tasks migration among node's hardware towards an optimal system load-balancing aiming at performance gains. This way, time requirements and its crosscutting behavior play an important role for task (re)allocation decisions. This paper presents a self-rescheduling task strategy that makes use of aspect-oriented paradigms to address non-functional application timing constraints from earlier design phases. A case study exploring Radar Image Processing tasks is presented to demonstrate the proposed approach. Simulations results for this case study are provided in the context of a surveillance system based on Unmanned Aerial Vehicles (UAVs). © 2009 SCPE.

关键词： Program processors

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Estimation of oxygen tension in retinal capillaries from phosphorescence lifetime images

Estimation of oxygen tension in retinal capillaries from pho...

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IEEE International Symposium on Biomedical Imaging

作者： Isa Yildirim Rashid Ansari Justin Wanek I. Samil Yetik Mahnaz Shahidi The Department of Electrical and Computer Engineering University of Illinois Chicago USA The Informatics Institute of Istanbul Technical University Istanbul TR Turkey The Department of Electrical and Computer Engineering University of Illinois Chicago IL The Department of Ophthalmology and Visual Sciences University of Illinois Chicago IL USA The Department of Ophthalmology and Visual Sciences University of Illinois Chicago IL Medical Imaging Research Center Illinois Institute of Technology Chicago IL

ISBN: (纸本)9781424439317

Investigating the effect of retinal oxygenation abnormalities in the development of common eye diseases requires accurate assessment of oxygen tension in retinal vasculatures. Estimation of oxygen tension in retinal capillaries using phosphorescence lifetime imaging is addressed in this paper. Separation from tissue and oxygen tension estimation is a more challenging task for capillaries when compared with large retinal vessels due to the finer structure and noise predominance in capillaries. An automated segmentation procedure is applied using the EM algorithm and noise contamination is reduced using a regularization method unlike previous approaches to capillary analysis where segmentation was done manually and noise contamination was ignored. We demonstrate the effectiveness of the proposed method by applying it to the retinal image data acquired from rat eyes, and we show that the oxygen tension estimate of retinal capillaries falls in the physiologically expected range.

关键词： Life estimation Lifetime estimation Retina Phosphorescence Image segmentation Noise reduction Contamination Diseases Retinal vessels Algorithm design and analysis

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Evolutionary dimensionality reduction for crack localization in ship structures using a hybrid computational intelligent approach

Evolutionary dimensionality reduction for crack localization...

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International Joint Conference on Neural Networks (IJCNN)

作者： Vassilios A. Kappatos George Georgoulas Chrysostomos D. Stylios Evangelos S. Dermatas Electrical Engineering Department University of Patras Rio-Patras Greece Department of Computer Applications in Finance and Management TEI of Ionian Islands Lefkas Greece Laboratory of Knowledge and Intelligent Computing Department of Informatics and Communications Technology TEI Epirus Artas Greece

Acoustic emission (AE) is one of the most important non-destructive testing (NDT) methods for materials and constructions. Using AE testing, the location of a single event (crack) can be classified efficiently into three typical areas in a ship hull. The problem is a typical classification problem based on the use of features extracted from piezo-sensors' signal. As in most classification problems, the extraction and selection of the most appropriate set of features plays a major role in the overall performance of the system. In this research work we investigate the use of an evolutionary algorithm to extract new features from a set of primitive features in a lower dimensional space through a linear transformation. These features are subsequently fed into a probabilistic neural network (PNN) that performs the classification. In simulation experiments, where a stiffened plate model (SPM) is partially sank into water, the localization rate in noisy environments outperforms a work, where a feature selection phase alone was used before the classification phase. The proposed hybrid computational intelligent approach shows the potential merit of using it in real life situations where the signal is distorted by noise.

关键词： Marine vehicles Computational intelligence Intelligent structures Competitive intelligence Acoustic testing Feature extraction Working environment noise Acoustic emission Materials testing Nondestructive testing

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