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12th Workshop on Stochastic Models, Statistics and their Applications, 2015

作者： Steland, Ansgar Szajowski, Krzysztof Rafajlowicz, Ewaryst Institute of Statistics RWTH Aachen University Aachen Germany Inst. of Mathematics and Computer Science Wroclaw University of Technology Wroclaw Poland Dept. of Computer Engineering Control and Robotics Wroclaw University of Technology Wroclaw Poland

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A Pheromone-Like Model for Semantic Context Extraction from Collaborative Networks

A Pheromone-Like Model for Semantic Context Extraction from ...

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IEEE WIC ACM International Conference on Web Intelligence (WI)

作者： Valentina Franzoni Alfredo Milani Dept. of Computer Control and Management Engineering University of Rome La Sapienza Italy Dept. of Mathematics and Computer Science University of Perugia Perugia Italy Dept. of Computer Science Hong Kong Baptist University Hong Kong

The extraction of semantic contexts is a relevant issue in information retrieval to provide high quality query results. This paper introduces the semantic context underlying a set of given input concepts as defined by the relevant multiple explanation paths connecting the input concepts in a collaborative network. A pheromone-like model based on this approach is introduced for the detection and the extraction of multiple paths of explanation between seed concepts. The exploration of the online collaborative network of explanation uses a heuristic driven random walk, based on semantic proximity measures. Random walks distribute pheromone on the traversed arcs used to evaluate the relevance of concepts in the multiple explanatory paths to be extracted. Experimental results obtained on accepted datasets and contexts extracted from the Wikipedia collaborative network show that the proposed algorithm can extract contexts with high relevance degree, which outperforms other methods. The approach has a general applicability and can be extended to other explanation-based online collaborative networks.

关键词： Semantics Context Collaborative work Encyclopedias Electronic publishing Internet

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Efficient detection of viral transmission with threshold-based methods 5

Efficient detection of viral transmission with threshold-bas...

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5th IEEE International Conference on Computational Advances in Bio and Medical sciences, ICCABS 2015

作者： Rytsareva, Inna Sims, Seth Chockalingam, Sriram P. Aluru, Srinivas Campo, David S. Tetik, Cansu Thankachan, Sharma V. Khudyakov, Yury Yueli, Zheng Chirag, Jain Sue, Amanda Molecular Epidemiology and Bioinformatics Laboratory Division of Viral Hepatitis Centers for Disease Control and Prevention Atlanta United States Dept. of Computer Science and Engineering IIT Bombay Mumbai India School of Computational Science and Engineering Georgia Institute of Technology Atlanta United States Centers for Disease Control and Prevention Atlanta United States

ISBN: (纸本)9781467396639

Hepatitis C is a major public health problem in the United States and worldwide. Outbreaks of hepatitis C virus (HCV) infections associated with unsafe injection practices, drug diversion, and other exposures to blood are difficult to detect and investigate. Molecular analysis has been frequently used in the study of HCV outbreaks and transmission chains;helping identify a cluster of sequences as linked by transmission if their genetic distances are below a previously defined threshold. © 2015 IEEE.

关键词： Public health

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Weld seam recognition based on CCD image processing

International Journal of Signal Processing, Image Processing...

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International Journal of Signal Processing, Image Processing and Pattern Recognition 2015年第6期8卷 245-252页

作者： Yu, Jintao Li, Xian Ding, Mingli Dong, Shicheng Li, Junling School of Computer and Information Engineering Harbin University of Commerce Harbin China Dept. of Automatic Test and Control Harbin Institute of Technology Harbin China

Weld seam recognition is the key technique in visual tracking research. Based on the weld image features, the image preprocessing and the linear feature extraction method of the weld seam recognition are designed. The extended adaptive median filtering method and modified Otsu adaptive threshold selection method for image segmentation are used in the image pre-processing process, to remove the noise and compress the image data. Through comparing with several other edge operators, the Roberts operator is chosen to achieve the goal of detecting the welding edge. Finally, the weld seam information is extracted through Hough transform and a satisfied result can be acquired. The study provides a theoretical support for the following designing of the weld tracking system. © 2015 SERSC.

关键词： Welds

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A classification framework for diagnosis of focal liver diseases

A classification framework for diagnosis of focal liver dise...

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International Conference on computer Engineering and Systems

作者： Tarek M. Hassan Mohammed Elmogy Elsayed Sallam Communications and Computers Eng. Dept. Delta University Mansoura Egypt Information Technology Dept. Mansoura University Mansoura Egypt Computer and Automatic Control Eng. Dept. Tanta University Tanta Egypt

computer-aided detection/diagnosis (CAD) systems are critical for doctors to understand the medical images and to improve the accuracy of detection/diagnosis of various diseases. The goal of this paper is to propose a classification framework for diagnosing different focal liver diseases based on ultrasound (US) images. Ultrasound medical imaging is one of the most common modality, which is used in diagnostic systems because of its safety and cost effectiveness. In this paper, we introduced a framework for a CAD system to diagnosing three classes of focal liver diseases, which are Cyst, Hemangioma (HEM), and Hepatocellular Carcinoma (HCC). The proposed system begins with a preprocessing step to make enhancement and noise removal of US images using a median filter. The segmentation of the liver lesions regions is done using level set method followed by the fuzzy c-mean clustering algorithm. Finally, we have used a multi-support vector machine (multi-SVM) classifier to diagnosis the classes of the focal liver diseases. By using 10-fold cross validation method, we have got an overall classification accuracy of 96.5%. Our proposed system is compared with some state of the art techniques. The experimental results show that the proposed system gives better overall accuracy than the other tested techniques.

关键词： Feature extraction Liver diseases Design automation Image segmentation Lesions Diseases

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Medical image fusion in NSCT domain combining with compressive sensing

International Journal of Multimedia and Ubiquitous Engineeri...

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International Journal of Multimedia and Ubiquitous Engineering 2015年第5期10卷 1-8页

作者： Wang, Aili Zhao, Jiaying Iwahori, Yuji Dai, Shiyu Higher Education Key Lab for Measuring and Control Technology and Instrumentations of Heilongjiang Harbin China Dept. of Computer Science Chubu University Japan

In recent years, with the development of compressive sensing (CS) theory, it has been widely applied to each field including image fusion, and obtained better fusion effect. And CS can reduce dimensions and the amount of data characteristics as well as the large amount and high computation complex. Therefore, this paper proposes a novel medical image fusion method based on compressive sensing theory in non-subsampled contourlet transform (NSCT) domain. First, NSCT transform is applied to the source images, and the coefficients in low frequency subband are fused by mean rules. For high frequency subband, CS is applied and the coefficients are fused by neighborhood-energy-MAX (NE-MAX) rule, then inverse CS is used to get fused coefficients. Finally, inverse NSCT is applied to get the reconstructed image. The experimental results show that the fusion algorithm proposed in this paper is superior to fusion method based on WT-MAX and CS-MAXCS-MEAN. © 2015 SERSC.

关键词： Compressed sensing

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Non-simplex Enclosing Polytope Generation Concept for Tensor Product Model Transformation based controller Design

Non-simplex Enclosing Polytope Generation Concept for Tensor...

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IEEE International Conference on Systems, Man, and Cybernetics

作者： József Kuti Péter Galambos Péter Baranyi Institute for Computer Science and Control Hungarian Academy of Sciences Kende u. 13-17 H-llll Budapest Hungary Antal Bejczy Center for Intelligent Robotics óbuda University Bécsi út 96/b H-1034 Budapest Hungary Dept. of Informatics Széchenyi István University Egyetem tér 1. H-9026 Gy?r Hungary

ISBN: (纸本)9781509018987

In polytopic model-based controller synthesis, the vertices of the model determine the achievable performance characteristics. This paper introduces a new concept, that allows for the sophisticated construction of non-simplex enclosing polytopes. The non-simplex structures in general, have much better descriptor properties than the simplex one that leads to less conservative synthesis. The paper demonstrates the workflow of controller design for a nonlinear system through the example of the TORA (Translational Oscillator with a Rotational Actuator) system. The numerical results clearly show that the proposed approach is capable of excluding non-stabilizable regions located between the exact convex hull and the enclosing simplex. The non-simplex polytope leads to an increased number of vertices but it practically does not influence the viability of Tensor-Product (TP) formalization and the feasibility of controller design while the achievable control performance can be improved significantly.

关键词： LMI-based design TP Model Transformation Polytopic modelling qLPV modelling

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Spectral design of output feedback controllers for systems pre-compensated by input shapers 12

Spectral design of output feedback controllers for systems p...

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12th IFAC Workshop on Time Delay Systems, TDS 2015

作者： Pilbauer, Dan Vyhlídal, Tomáš Michiels, Wim Dept. of Instrumentation and Control Eng. Faculty of Mechanical Engineering Czech Technical University in Prague Technická 166 07 Praha 6 Czech Republic Department of Computer Science Katholieke Universiteit Leuven Celestijnenlaan 200A HeverleeB-3001 Belgium

The primary objective is to investigate the applicability of spectral methods for designing feedback controllers for a closed loop system with an input shaper with time delays. The shaper is included in the feedback loop in order to pre-compensate low-damped oscillatory modes of a flexible subsystem. However, after inserting a shaper into the feedback loop, the closed loop dynamics becomes infinite dimensional. A robust controller design then requires guaranteeing that all the infinitely many poles of the closed loop system will safely be located in the left half of the complex plane. Besides, the closed loop dynamics need to be sufficiently fast in order to take over and keep filtering properties of the input shaper. For the spectral design of the controller, the recently developed spectral abscissa minimization approach for interconnected time delay systems is applied. The presented methods are tested on a case study simulation example, which is a multi-degree of freedom mechanical system. © 2015, IFAC (International Federation of automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Closed loop systems

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Flight envelope information-augmented display for enhanced pilot situation awareness

Flight envelope information-augmented display for enhanced p...

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AIAA Infotech @ Aerospace 2015

作者： Ackerman, Kasey A. Seefeldt, Benjamin D. Xargay, Enric Talleur, Donald A. Carbonari, Ronald S. Kirlik, Alex Hovakimyan, Naira Trujillo, Anna C. Gregory, Irene M. University of Illinois at Urbana-Champaign UrbanaIL61801 United States NASA Langley Research Center HamptonVA23681 United States Dept. of Mechanical Science and Engineering United States Dept. of Computer Science United States Institute of Aviation United States Beckman Institute United States Crew Systems and Aviation Operations Branch United States Dynamic Systems and Control Branch United States

ISBN: (纸本)9781624103384

This paper presents an interface system display which is conceived to improve pilot situation awareness with respect to a flight envelope protection system developed for a mid-sized transport aircraft. The new display is designed to complement existing cockpit displays, and to augment them with information that relates to both aircraft state and the control automation itself. In particular, the proposed display provides cues about the state of automation directly in terms of pilot control actions, in addition to flight parameters. The paper also describes a forthcoming evaluation test plan that is intended to validate the developed interface by assessing the relevance of the displayed information, as well as the adequacy of the display layout. © 2015, American Institute of Aeronautics and Astronautics Inc. All rights received.

关键词： Flight envelopes

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Active fault diagnosis in sampled-data systems 9

Active fault diagnosis in sampled-data systems

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9th IFAC Symposium on Fault Detection, Supervision and Safety for Technical Processes, SAFEPROCESS 2015

作者： Niemann, Henrik Poulsen, Niels Kjølstad Department of Electrical Engineering Automation and Control Technical University of Denmark Building 326 Kgs. LyngbyDK-2800 Denmark Dept. of Applied Mathematics and Computer Science Section for Dynamical Systems Technical University of Denmark Kgs. LyngbyDK-2800 Denmark

The focus in this paper is on active fault diagnosis (AFD) in closed-loop sampleddata systems. Applying the same AFD architecture as for continuous-time systems does not directly result in the same set of closed-loop matrix transfer functions. For continuous-time systems, the LFT (linear fractional transformation) structure in the connection between the parametric faults and the matrix transfer function (also known as the fault signature matrix) applied for AFD is not directly preserved for sampled-data system. As a consequence of this, the AFD methods cannot directly be applied for sampled-data systems. Two methods are considered in this paper to handle the fault signature matrix for sampled-data systems such that standard AFD methods can be applied. The first method is based on a discretization of the system such that the LFT structure is preserved resulting in the same LFT structure in the fault signature matrix as obtained for continuous-time systems. The other method is an approximation method, where the same structure is obtained for small parametric faults. © 2015, IFAC (International Federation of automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Continuous time systems

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