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Iranian Conference of Biomedical engineering

作者： Hamid Khosravi Mahsa Mohammadkhani Hamid Soltanian-Zadeh Control and Intelligent Processing Center of Excellence School of Electrical and Computer Engineering Faculty of Engineering University of Tehran Tehran Iran Department of Computing Science University of Alberta Edmonton Alberta (AB) Canada

ISBN: (纸本)9781467331289

The inverse mapping in MagnetoEncephaloGraphy involves localizing neuronal activity of the gray matter tissue from measured signals around the head. The search space of the inverse mapping is conventionally represented in 3-D Cartesian coordinates including the cortical volume, or alternatively, 2-D manifold describing the cortical tissue. 3-D Cartesian coordinates does not suit sparse regularization of the inverse mapping in multi-resolution source domains. On the other hand, boundary surface of the cortex, represented as triangulated mesh, is used as the search space in some other inverse mapping techniques. However, this surface does not represent depth of the cortex. Moreover, to represent neuronal activity in embedded signal dictionaries, convoluted manifold should be gridded. In this paper we propose to use medial surface as the best surface descriptor of the cortical tissue. Furthermore, manifold gridding is constructed by defining bijective mapping between a flattened parameterized domain and convoluted surface. Signal bases are defined conventionally in the parameterized domain and mapped to the cortical volume by means of the bijective mapping. Medial surface of the cortex tissue, represented as triangulated mesh, is extracted by gradient-based search algorithm. Source localization, for simulated neuronal activity, is performed in real head model extracted from magnetic resonance images. Sparse estimated source of the inverse mapping are compared on volume, boundary surface, and medial surface domains. Simulation results confirm advantages of surface over volume domain. Performnace measures of source localization proves the medial surface as the best surface describing the cortex volume.

关键词： Magneto-encephalography (MEG) Inverse mapping Sparse regularization Multi-resolution Medial surface Mesh parameterization

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A novel segmentation method for convex lesions based on dynamic programming with local intra-class variance 12

A novel segmentation method for convex lesions based on dyna...

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27th Annual ACM Symposium on Applied computing, SAC 2012

作者： Yu, Mali Huang, Qiliang Jin, Renchao Song, Enmin Liu, Hong Hung, Chih-Cheng School of Computer Science Huazhong University of Science and Technology Wuhan China Key Laboratory of Education Ministry for Image Processing and Intelligent Control Wuhan Hubei China Radiology Department Second People's Hospital of Nanning Nanning China School of Computing and Software Engineering Southern Polytechnic State University GA United States

ISBN: (纸本)9781450308571

Lesion segmentation plays an important role in medical image processing and analysis. There exist several successful dynamic programming (DP) based segmentation methods for general images. In those methods, the gradient is used as an important factor in the cost function to attract the contours to the boundaries. Since medical images have their characteristics such as low contrast, blurred edges and high noises, the gradient operator cannot work well enough to achieve a satisfactory performance for boundary detection. We define the local intra-class variance and combine it with the dynamic programming method to replace the traditional gradient operation. Experiments on synthetic and X-ray images are carried out and the results are compared with Canny and fast multilevel fuzzy edge detection (FMFED) algorithms. It is demonstrated that the proposed method performs better on medical images with low contrast, blurred edges and high noises. In addition, 483 regions of interest of mammograms randomly extracted from DDSM of the University of South Florida are used to compare our proposed method with the plane-fitting and dynamic programming method (PFDP), and the normalized cut segmentation method (Ncut). The results demonstrate that our method is more accurate and robust than PFDP and Ncut. © 2012 ACM.

关键词： Dynamic programming

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Artificial neural network based prediction of optimal pseudo-damping and meta-damping in oscillatory fractional order dynamical systems

Artificial neural network based prediction of optimal pseudo...

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1st International Conference on Advances in engineering, Science and Management, ICAESM-2012

作者： Das, Saptarshi Pan, Indranil Sur, Khrist Das, Shantanu Department of Power Engineering Jadavpur University Salt-Lake Campus LB-8 Kolkata-700098 India Department of Earth Science and Engineering Research Section Imperial College London Exhibition Road London SW7 2AZ United Kingdom Center for Soft Computing Research Indian Statistical Institute 203 Barrackpore Trunk Road Kolkata-700 1 08 India Reactor Control Division Bhabha Atomic Research Centre Mumbai-400085 India

ISBN: (纸本)9781467302135

This paper investigates typical behaviors like damped oscillations in fractional order (FO) dynamical systems. Such response occurs due to the presence of, what is conceived as, pseudo-damping and meta-damping in some special class of FO systems. Here, approximation of such damped oscillation in FO systems with the conventional notion of integer order damping and time constant has been carried out using Genetic Algorithm (GA). Next, a multilayer feed-forward Artificial Neural Network (ANN) has been trained using the GA based results to predict the optimal pseudo and meta-damping from knowledge of the maximum order or number of terms in the FO dynamical system. © 2012 Pillay engineering College.

关键词： Damping

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Reverse engineering of TopHat: Splice Junction Mapper for Improving Computational Aspect

Reverse Engineering of TopHat: Splice Junction Mapper for Im...

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International Conference on Intelligent Systems, Modelling and Simulation (ISMS)

作者： Olivier Terzo Lorenzo Mossucca Andrea Acquaviva Francesco Abate Elisa Ficarra Rosalba Provenzano Infrastructure and Systems for Advanced Computing (IS4AC) Istituto Superiore Mario Boella Torino Italy Department of Control and Computer Engineering Politecnico di Torino Torino Italy

TopHat is a fast splice junction mapper for Next Generation Sequencing analysis, a technology for functional genomic research. Next Generation Sequencing technology allows more accurate analysis increasing data to elaborate, this opens to new challenges in terms of development of tools and computational infrastructures. We present a solution that cover aspects both software and hardware, the first one, after a reverse engineering phase, provides an improvement of algorithm of TopHat making it parallelizable, the second aspect is an implementation of an hybrid infrastructure: grid and virtual grid computing. Moreover the system allows to have a multi sample environment and is able to process automatically totally transparent to user.

关键词： Bioinformatics Genomics DNA Junctions Software RNA

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Nanorobotic transfer and characterization of graphene flakes

Nanorobotic transfer and characterization of graphene flakes

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2012 IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： Sören Zimmermann Volkmar Eichhorn Sergej Fatikow Technology Cluster Automated Nanohandling (TCANH) Institute for Information Technology (OFFIS) Oldenburg Germany Division Microrobotics and Control Engineering (AMiR) Department of Computing Science University of Oldenburg Germany

This paper presents a nanorobotic approach facilitating the transfer and characterization of individual graphene flakes that are grown by different fabrication techniques. The approach makes use of a nanorobotic atomic force microscope system that is integrated into a high resolution scanning electron microscope and focused ion beam device. This combination is used to perform both, the nanorobotic transfer and the mechanical characterization of the graphene flake allowing to systematically analyze different sample areas and to optimize the fabrication processes. Furthermore, the nanorobotic system enables the reliable pick-and-place handling and processing of graphene flakes to realize more comprehensive analysis steps or even the prototyping of graphene-based devices.

关键词： Substrates Tungsten Probes Scanning electron microscopy Ion beams

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Induced ℓ2 control of discrete-time Takagi-Sugeno fuzzy systems with time-varying delays via dynamic output feedback

Induced ℓ2 control of discrete-time Takagi-Sugeno fuzzy sys...

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IEEE Conference on Decision and control

作者： Xiaojie Su Peng Shi Ligang Wu Hamid Reza Karimi Rongni Yang Space Control and Inertial Technology Research Center Harbin Institute of Technology Harbin China School of Engineering and Science Victoria University Melbourne Australia School of Electrical and Electronic Engineering University of Adelaide SA Australia Department of Computing and Mathematical Sciences University of Glamorgan Pontypridd UK Department of Engineering Faculty of Engineering and Science University of Agder Grimstad Norway School of Control Science and Engineering Shandong University Jinan China

This paper is concerned with analyzing a novel model transformation of discrete-time Takagi-Sugeno (T-S) fuzzy systems with time-varying delays and applying it to dynamic output feedback (DOF) controller design. A new auxiliary model is proposed by employing a new approximation for time-varying delay state, and then delay partitioning method is used to analyze the scaled small gain of this auxiliary model. A sufficient condition on discrete-time T-S fuzzy systems with time-varying delays, which guarantees the corresponding closed-loop system to be asymptotically stable and has an induced ℓ 2 disturbance attenuation performance, is derived by employing the scaled small gain theorem. Then the solvability condition for the induced ℓ 2 DOF control is also established, by which the DOF controller can be found by solving a set of linear matrix inequalities (LMIs).

关键词： Delay Time varying systems Closed loop systems Output feedback Fuzzy systems Educational institutions Delay systems

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$H_{\infty}$ Filtering for Discrete-Time Systems With Stochastic Incomplete Measurement and Mixed Delays

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IEEE Transactions on Industrial Electronics 2012年第6期59卷 2732-2739页

作者： Peng Shi Xiaoli Luan Fei Liu School of Engineering and Science Victoria University Melbourne VIC Australia Key Laboratory of Advanced Control for Light Industry Processes Ministry of Education Institute of Automation Jiangnan University Wuxi China Department of Computing and Mathematical Sciences University of Glamorgan Pontypridd UK

This paper focuses on the H ∞ filtering problem for a class of discrete-time systems with stochastic incomplete measurement and mixed random delays. A more realistic and accurate measurement mode is proposed to compensate for the negative influence of both missing data and different time delays in a random way. In the system, all of the stochastic variables are mutually independent but satisfy the Bernoulli binary distribution. In particular, the stochastic infinite distributed delays are introduced in the discrete-time domain. Sufficient conditions for the existence of the admissible filter are derived in terms of linear matrix inequalities, which ensures the asymptotic stability as well as a prescribed H ∞ performance for the filter errors. A simulation example is exploited to demonstrate the effectiveness of the proposed design procedures.

关键词： Discrete time systems Symmetric matrices Linear matrix inequalities Loss measurement Delay effects Distributed databases Stochastic processes Random processes

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Stability Analysis for High Frequency Networked control Systems

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IEEE Transactions on Automatic control 2012年第10期57卷 2694-2700页

作者： Hongjiu Yang Yuanqing Xia Peng Shi Mengyin Fu Institute of Electrical Engineering Yanshan University Qinhuangdao China School of Automation Key Laboratory of Intelligent Control and Decision of Complex Systems Beijing Institute of Technology Beijing China School of Engineering and Science Victoria University Melbourne VIC Australia Department of Computing and Mathematical Sciences University of Glamorgan Pontypridd UK

This note generalizes the stability analysis for a high frequency networked control system. The high-frequency networked control system is described by a delta operator system with a high frequency constraint. Stability conditions are given for the high frequency delta operator system. Furthermore, by developing the generalized Kalman-Yakubovic-Popov lemma, improved stability conditions are also presented in terms of linear matrix inequalities. Some experiment results are presented to illustrate the effectiveness of the developed techniques.

关键词： Stability analysis Delay Linear matrix inequalities Frequency control Educational institutions Power system stability Numerical stability

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Subthreshold characteristics of pentacene field-effect transistors influenced by grain boundaries

Subthreshold characteristics of pentacene field-effect trans...

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作者： Park, Jaehoon Jeong, Ye-Sul Park, Kun-Sik Do, Lee-Mi Bae, Jin-Hyuk Sun Choi, Jong Pearson, Christopher Petty, Michael RFID/USN Research Department Electronics and Telecommunication Research Institute 138 Gajeongno Yuseong-gu Daejeon 305-700 Korea Republic of Department of Bioelectronics Microelectronic Center of Provence Ecole Nationale Supérieure des Mines de Saint-Etienne Gardanne 13541 France Department of Electrical Information and Control Engineering Hongik University 72-1 Sangsu-dong Mapo-gu Seoul 121-791 Korea Republic of School of Engineering and Computing Sciences Centre for Molecular and Nanoscale Electronics Durham University Durham DH1 3LE United Kingdom

Grain boundaries in polycrystalline pentacene films significantly affect the electrical characteristics of pentacene field-effect transistors (FETs). Upon reversal of the gate voltage sweep direction, pentacene FETs exhibited hysteretic behaviours in the subthreshold region, which was more pronounced for the FET having smaller pentacene grains. No shift in the flat-band voltage of the metal-insulator-semiconductor capacitor elucidates that the observed hysteresis was mainly caused by the influence of localized trap states existing at pentacene grain boundaries. From the results of continuous on/off switching operation of the pentacene FETs, hole depletion during the off period is found to be limited by pentacene grain boundaries. It is suggested that the polycrystalline nature of a pentacene film plays an important role on the dynamic characteristics of pentacene FETs. © 2012 American Institute of Physics.

关键词： Grain boundaries

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Herb 2.0: Lessons learned from developing a mobile manipulator for the home

Herb 2.0: Lessons learned from developing a mobile manipulat...

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作者： Srinivasa, Siddhartha S. Berenson, Dmitry Cakmak, Maya Collet, Alvaro Dogar, Mehmet R. Dragan, Anca D. Knepper, Ross A. Niemueller, Tim Strabala, Kyle Vande Weghe, Mike Ziegler, Julius Robotics Institute Carnegie Mellon University Pittsburgh PA 15213 United States Electrical Engineering and Computer Science Department University of California Berkeley Berkeley 94703 United States School of Interactive Computing Georgia Institute of Technology Atlanta GA 30332 United States Knowledge-based Systems Group RWTH Aachen University Aachen 52062 Germany Department of Measurement and Control Systems Karlsruhe Institute of Technology Karlsruhe D-76128 Germany

We present the hardware design, software architecture, and core algorithms of Herb 2.0, a bimanual mobile manipulator developed at the Personal Robotics Lab at Carnegie Mellon University, Pittsburgh, PA. We have developed Herb 2.0 to perform useful tasks for and with people in human environments. We exploit two key paradigms in human environments: that they have structure that a robot can learn, adapt and exploit, and that they demand general-purpose capability in robotic systems. In this paper, we reveal some of the structure present in everyday environments that we have been able to harness for manipulation and interaction, comment on the particular challenges on working in human spaces, and describe some of the lessons we learned from extensively testing our integrated platform in kitchen and office environments. © 2012 IEEE.

关键词： Motion planning

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