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15th International Conference on Miniaturized Systems for Chemistry and Life Sciences 2011, MicroTAS 2011

作者： Dutz, S. Hayden, M.E. Schaap, A. Stoeber, B. Häfeli, U.O. Faculty of Pharmaceutical Sciences University of British Columbia Vancouver Canada Department of Nano Biophotonics Institute of Photonic Technology Jena Germany Department of Physics Simon Fraser University Burnaby Canada Department of Mechanical Engineering University of British Columbia Vancouver Canada Electrical and Computer Engineering University of British Columbia Vancouver Canada

ISBN: (纸本)9781618395955

We present a microfluidic-chip-based concept for continuous fractionation of magnetic microspheres (MMS) having a broad size distribution. Fractionation is achieved through a combination of shear-induced inertial lift forces that act on particles flowing through a curvilinear channel (i.e., Dean Flow) and magnetostatic forces produced by an octupolar arrangement of magnets mounted below the chip. The chip was designed, built, and tested using different MMS mixtures. The novel device enables the complete recovery of MMS from highly diluted suspensions, the separation of MMS mixtures, and size dependent fractionation of MMS.

关键词： Microspheres

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Unsupervised classification and spectral unmixing for sub-pixel labelling

Unsupervised classification and spectral unmixing for sub-pi...

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： A. Villa J. Chanussot J. A. Benediktsson C. Jutten GIPSA-Laboratory Signal & Image Department INPG Grenoble Institute of Technology France Faculty of Electrical and Computer Engineering University of Iceland Iceland

The unsupervised classification of hyperspectral images containing mixed pixels is addressed in this paper. Hyperspectral images are characterized by a trade-off between the spectral and the spatial resolution, this leading to data sets containing mixed pixels, e.g. pixels jointly occupied by more than a single land cover class. In [1], a preliminary research based on spectral unmixing concepts was conducted, in order to handle mixed pixels and to obtain thematic maps at a finer spatial resolution. In this work, we extend the investigation by proposing a new methodology based on image clustering. Experiments conducted on real data show the comparative effectiveness of the proposed method, which provides good results in terms of accuracy and is less sensitive to pixels with extreme values of reflectance.

关键词： Spatial resolution Hyperspectral imaging Accuracy Simulated annealing

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Transport Properties and Electron Microscopy Studies of Ion Implanted Graphite

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MRS Online Proceedings Library (OPL) 2011年第1期27卷 487-487页

作者： T.C. Chieu B.S. Elman L. Salamanca-Riba M. Endo G. Dresselhaus Department of Electrical Engineering and Computer Science Department of Physics Francis Bitter National Magnet Laboratory Massachusetts Institute of Technology Cambridge MA 02139 USA Faculty of Engineering Shinshu University Nagano Japan.

Graphite fibers with high structural perfection and small diameters (∼1 μm) provide a sensitive medium to study the effect of ion implantation on the transport properties of graphite and to observe the defect structure associated with the implantation process. Graphite fibers prepared from the thermal decomposition of benzene and subsequent heat treatment to high temperatures (∼2900°C) have been shown to achieve the high structural perfection necessary to carry out such experiments. Implantation-induced changes in the fiber resistivity are reported and are found to be larger at low temperature, as expected on the basis of residual resistance arguments. Using the lattice fringe imaging technique of high resolution electron microscopy, the implantation-induced defect structure can be observed directly. The results show local expansion of the interlayer graphite planes, with an interlayer separation ranging up to 3.9 Å in the implanted region, compared with ∼3.4 Å for the well-ordered layers beyond the ion penetration depth.

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A Switched Based Control Strategy for Target Tracking of Autonomous Robotic Vehicles using Range-only Measurements

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IFAC Proceedings Volumes 2011年第1期44卷 12819-12824页

作者： Omid Namaki-Shoushtari A. Pedro Aguiar Ali Khaki Sedigh Faculty of Electrical and Computer Engineering K.N. Toosi University of Technology Tehran Iran Institute for Systems and Robotics (ISR) Instituto Superior Técnico (IST) Lisbon Portugal

Abstract In this paper we address the pursuing or target tracking problem where an autonomous robotic vehicle is required to move towards a maneuvering target using range-only measurements. A new switched based control strategy is proposed to solve the pursuing problem that can be described as comprising a continuous cycle of two distinct phases: i) the determination of the bearing, and ii) following the direction computed in the previous step while the range is decreasing. We provide conditions under which the switched closed-loop system achieves convergence of the relative distance error to a small neighborhood around zero. Simulation results are presented and discussed.

关键词： Target tracking Range-only measurements Switching control Autonomous robotic vehicles

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Fractinal order speed control of DC motor using levy mutated Artificial Bee Colony Algorithm

Fractinal order speed control of DC motor using levy mutated...

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World Congress on Information and Communication Technologies (WICT)

作者： Anguluri Rajasekhar Pratap Kunathi Ajith Abraham Millie Pant Department of Electrical and Electronics Engineering National Institute of Technology Warangal Andhra Pradesh India Faculty of Computer Science and Electrical Engineering VSB-Technical University of Ostrava Czech Republic Department of Paper and Pulp Technology Indian Institute of Technology Roorkee Roorkee India

In this paper we propose a new technique for designing feedback control of a DC motor speed using fractional order proportional-integral-derivative (FOPID controller). DC motor is often used in robotics and other fields of control and therefore speed control is very important. FOPID controller's parameters are composed of the proportionality constant, integral constant, derivative constant, derivative order and integral order, and its design is more complex than that of conventional integer-order proportional-integral-derivative (PID) controllers. Here the controller synthesis is formulated as a single objective optimization problem and based on Integral Time Absolute Error (ITAE) criterion. A modified Artificial Bee Colony Algorithm is been used to tune the FOPID controller parameters.

关键词： DC motors Mathematical model Probability distribution Transfer functions Optimization Electronic mail Algorithm design and analysis

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Cauchy movements for Artificial Bees for finding better food sources

Cauchy movements for Artificial Bees for finding better food...

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World Congress on Nature & Biologically Inspired Computing (NaBIC)

作者： Anguluri Rajasekhar Millie Pant Ajith Abraham Department of Electrical and Electronics Engineering National Institute of Technology Warangal Andhra Pradesh India Department of Paper and Pulp Technology Indian Institute of Technology Roorkee Roorkee India Faculty of Computer Science and Electrical Engineering VSB-Technical University of Ostrava Czech Republic

Artificial Bee Colony (ABC) algorithm is one of the most recent swarm intelligence based algorithms which simulates the foraging behavior of honey bee colonies. In the present study we propose a simple modification in the basic structure of ABC to enhance the capabilities of virtual bees in locating the potential food sources (ones having sufficient amount of nectar in them). If the virtual bees are unable to locate a good food source even after a particular number of cycles then they are forced towards another food source with the help of a small perturbation. The corresponding algorithm is named as C-ABC, where C stands for Cauchy distribution which helps the bees in getting away from food sources which are not so good. Analysis of the proposed C-ABC on 5 standard benchmark problems and 7 non-traditional problems, suggested in the special session of CEC'2008, shows that the incorporation of the proposed scheme considerably improves the performance of basic ABC algorithm.

关键词： Algorithm design and analysis Optimization Clustering algorithms Mathematical model Benchmark testing Heuristic algorithms Biology

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Design of fractional order PID controller using Sobol Mutated Artificial Bee Colony alogrithm

Design of fractional order PID controller using Sobol Mutate...

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International Conference on Hybrid Intelligent Systems (HIS)

作者： Anguluri Rajasekhar Ajith Abraham Millie Pant Department of Electrical and Electronics Engineering National Institute of Technology Warangal Andhra Pradesh India Faculty of Computer Science and Electrical Engineering VSB-Technical University of Ostrava Czech Republic Department of Paper and Pulp Technology Indian Institute of Technology Roorkee Roorkee India

Now-a-days fractional order controllers are replacing integer order controllers in various applications due to their robust mechanism in enhancing the system performance. The only complexity using fractional order controllers is to determine the gain parameters, followed by integral and derivative constant. This article describes the design of Fractional-Order Proportional-Integral-Derivative (FOPID) controller using a newly developed variant of ABC known as Sobol Mutated Artificial Bee Colony (S-ABC). The mutation component of S-ABC is based on quasi random Sobol sequence. Controller synthesis is obtained by minimizing Integral Time Absolute Error (ITAE) criterion. In order to digitally realize the FOPID controller Tustin operator based continuous fraction approximation (CFE) method is used. Simulation results for some real life plants and comparison with other state of art optimization techniques over same problems demonstrate the superiority of proposed approach.

关键词： Optimization Transfer functions Process control Hybrid intelligent systems Electronic mail Genetic algorithms Frequency domain analysis

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A novel hybrid excitation flux switching synchronous machine for a high-speed hybrid electric vehicle applications

A novel hybrid excitation flux switching synchronous machine...

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International Conference on electrical Machines and Systems (ICEMS)

作者： Erwan Sulaiman Takashi Kosaka Nobuyuki Matsui Department of Computer Science and Engineering Nagoya Institute of Technology Nagoya Japan Faculty of Electrical & Electronic Engineering University of Tun Hussein Onn Malaysia Johor Malaysia

Hybrid excitation machines (HEMs) that consist of permanent magnet (PM) and field excitation coil (FEC) as their main flux sources has several attractive features compared to interior permanent magnet synchronous machines (IPMSM) conventionally employed in hybrid electric vehicles (HEVs). Among various types of HEM, the machine with both permanent magnet and field excitation coil located on the stator has the advantage of robust rotor structure similar as switch reluctance machine (SRM). In addition, the variable flux control capabilities from field excitation coil make this machine becoming more attractive to be applied for high-speed motor drive systems, coupled with reduction gear. This HEM can be categorized as hybrid excitation flux switching synchronous machine (HEFSSM). In this paper, a novel 12Slot-10Pole HEFSSM where the field excitation coil is wounded in radial direction in the stator is proposed for traction drives in HEVs. The design target of the proposed machine is a maximum torque of 210Nm with reduction gear ratio of 4:1, a maximum power of 123kW, a maximum power density more than 3.5kW/kg, and a maximum speed of 20,000r/min with similar restrictions and specifications in IPMSM used for LEXUS RX400h. The deterministic design optimization method based on 2D-FEA is used to treat design parameters defined in rotor, armature coil slot and field excitation coil slot until the target performances are achieved, under maximum current density condition for both armature coil and field excitation coil. The final results show that the final design HEFSSM is able to keep the same torque density in existing IPMSM installed on a commercial SUV-HEV.

关键词： Rotors Torque Coils Stators Hybrid electric vehicles Traction motors Permanent magnets

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Mahalanobis kernel based on probabilistic principal component

Mahalanobis kernel based on probabilistic principal componen...

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： M. Fauvel A. Villa J. Chanussot J. A. Benediktsson INRA-DYNAFOR University of Toulouse France Faculty of Electrical and Computer Engineering University of Iceland Iceland GIPSA-Laboratory Grenoble Institute of Technology France

A kernel adapted to the spectral dimension of hyperspectral images is proposed in this paper. A distance based on a statistical cluster model is used to construct a radial kernel. This class specific kernel realizes a compromise between a conventional Gaussian kernel and a Gaussian kernel on the first principal components of the considered class. An automatic gradient optimization is used to select the optimal hyperparameters. Experimental results on a real hyperspectral image show the kernel is effective compared to the conventional Gaussian kernel. Furthermoren the proposed kernel is less sensitive to one hyperparameter compared to the Gaussian kernel applied on the first principal components of the data.

关键词： Kernel Accuracy Noise Hyperspectral imaging Covariance matrix Training

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Analysis of black box software testing techniques: A case study

Analysis of black box software testing techniques: A case st...

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International Conference on the Current Trends in Information technology (CTIT)

作者： Mumtaz Ahmad Khan Mohd. Sadiq Section of Electrical Engineering Faculty of Engineering and Technology Jamia Millia Islamia University Polytechnic A Central University New Delhi India Department of Computer Engineering National Institute of Technology Kurukshetra Haryana India

Software testing is a process of verifying and validating that a software application or program works as per the users expectations. It is used to find out the important defects, flaws, or errors in the application code. In this paper we have developed a tool to generate different test cases automatically. To show the validity of the tool, we have considered the line equation problem and generated different test cases, and finally we conclude that Robustness Technique is better than Boundary Value Analysis, because the expected output (number of times) in case of Robustness Technique for intersecting lines, parallel lines and coincident lines are 12, 12 and 1 respectively while in case of Boundary Value Analysis it is 8, 8 and 1 respectively.

关键词： Software Robustness Software engineering Software testing Input variables Programming

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