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检索条件"机构=Mechatronics Engineering Program"

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Improved quantum-inspired evolutionary algorithm with diversity information applied to economic dispatch problem with prohibited operating zones

Improved quantum-inspired evolutionary algorithm with divers...

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作者： Neto, Júlio Xavier Vianna De Andrade Bernert, Diego Luis Dos Santos Coelho, Leandro Pontifical Catholic University of Parana PUCPR Undergraduate Program at Mechatronics Engineering Imaculada Conceição 1155 Zip code 80215-901 Curitiba Parana Brazil Pontifical Catholic University of Parana PUCPR Industrial and Systems Engineering Graduate Program LAS/PPGEPS Imaculada Conceição 1155 80215-901 Curitiba Parana Brazil

The objective of the economic dispatch problem (EDP) of electric power generation, whose characteristics are complex and highly nonlinear, is to schedule the committed generating unit outputs so as to meet the required load demand at minimum operating cost while satisfying all unit and system equality and inequality constraints. Recently, as an alternative to the conventional mathematical approaches, modern meta-heuristic optimization techniques have been given much attention by many researchers due to their ability to find an almost global optimal solution in EDPs. Research on merging evolutionary computation and quantum computation has been started since late 1990. Inspired on the quantum computation, this paper presented an improved quantum-inspired evolutionary algorithm (IQEA) based on diversity information of population. A classical quantum-inspired evolutionary algorithm (QEA) and the IQEA were implemented and validated for a benchmark of EDP with 15 thermal generators with prohibited operating zones. From the results for the benchmark problem, it is observed that the proposed IQEA approach provides promising results when compared to various methods available in the literature. © 2010 Elsevier Ltd. All rights reserved.

关键词： Optimization

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Largely deformable surface electrode based on PDMS for cortical recording and stimulation

Largely deformable surface electrode based on PDMS for corti...

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International IEEE/EMBS Conference on Neural engineering, CNE

作者： Namsun Chou Soonki Yoo Sohee Kim School of Mechatronics Gwangju Institute of Science and Technology Gwangju South Korea Faculty of the school of Mechatronics and Graduate Program of Medical System Engineering Gwangju Institute of Science and Technology Gwangju South Korea

This paper describes a largely deformable surface electrode based on poly-dimethylsiloxane (PDMS) substrate, including its fabrication, electrochemical characterization, adhesion test, and bending test results. The fabricated electrode is made of both PDMS and parylene C layers, which are completely attached to each other. Between the two parylene layers gold patterns are located in the mechanical neutral plane. In the fabrication process, PDMS is supported by parylene layer when the metal layer is sputter deposited, resulting in no cracks. The electrode provides highly deformable neural electrode structure with mechanical integrity and electrical stability. With these advantages, it is expected to be suitable in stable neural recording and stimulation.

关键词： Electrodes Adhesives Substrates Metals Impedance Impedance measurement

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Path planning of mobile robots using potential fields and swarms of Brownian particles

Path planning of mobile robots using potential fields and sw...

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Congress on Evolutionary Computation

作者： Helbert Eduardo Espitia Jorge Iván Sofrony Systems Engineering Program Universidad Distrital Francisco José de Caldas Bogota Colombia Department of Mechanical Engineering and Mechatronics Universidad Nacional de Colombia Bogota Colombia

This paper proposes an algorithm for trajectory planning based on the motion of Brownian particles. One of the most popular approaches in path planning is to use the artificial potential fields method which, due to its easiness in implementation, might attract the robot towards a local minimum configuration, thus preventing it from reaching the desired final destination. Although there are different approaches to deal with this drawback, their modeling lacks the simplicity of the potential fields, adding thus an extra complexity to the problem. The solution proposed here combines the strengths of both approaches: it is easy to analyze and to implement, just like in the potentials method, while it preserves the robustness against local minima of more complex particle swarm models. An approximate analysis for the deterministic version of the selected model was performed and it was observed, via simulations, that the results obtained after this simplification were consistent with the behavior of the stochastic system.

关键词： Mathematical model Trajectory Equations Robots Stochastic processes Analytical models

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Selectively bonded polymeric check valve for the reliable regulation of intraocular pressure

Selectively bonded polymeric check valve for the reliable re...

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作者： Im, Seongmin Mun, Byungphil An, Jaeyong Choi, Jongchan Yang, Sung Lee, Jonghyun School of Mechatronics Gwangju Institute of Science and Technology Gwangju Korea Republic of Graduate Program of Medical System Engineering Gwangju Institute of Science and Technology Gwangju Korea Republic of Department of Nanobio Materials and Electronics Gwangju Institute of Science and Technology Gwangju Korea Republic of

ISBN: (纸本)9789898425379

A glaucoma drainage device for the regulation of intraocular pressure is presented. The device consists of three biocompatible polymer layers: the cover (top layer), the diaphragm (intermediate layer), and the baseplate with a cannular (bottom layer). Finite element analyses (FEA) were performed to find optimal design parameters for the targeted cracking pressure: the diameter of orifice, the thickness of intermediate layer, the width of the channel, and the overlapped length of the orifice over valve seat. Top and bottom layers were made by polydimethylsiloxane (PDMS) replica molding process, and an intermediate thin layer with through-holes was fabricated by PDMS fill-in molding method and hydrophobic treatment. The overlapped area of the bottom layer was coated with Cr and Au by using PDMS as a shadow mask. Metal layers are not to be bonded between the bottom and the intermediate layers so that the device showed the enhanced reliability in operation and the higher yield in production. Oxygen plasma treatment was performed for irreversible bonds between separate three PDMS layers. The experimental cracking pressure of the fabricated valve was 2.50 kPa, which is very close to the target value (2.67 kPa). The experiments showed that the proposed polymer check valve can regulate the pressure of the aqueous humour, fluid in an anterior chamber, within the normal intraocular pressure range (15-20mmHg) with a high repeatability.

关键词： Polydimethylsiloxane

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Real-time implementation of GPS aided low-cost strapdown inertial navigation system

Real-time implementation of GPS aided low-cost strapdown ine...

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作者： Sahawneh, L.R. Al-Jarrah, M.A. Assaleh, K. Abdel-Hafez, Mamoun F. Mechatronics Graduate Program American University of Sharjah P.O. Box 26666 Sharjah United Arab Emirates Department of Mechanical Engineering American University of Sharjah P.O. Box 26666 Sharjah United Arab Emirates Department of Electrical Engineering American University of Sharjah P.O. Box 26666 Sharjah United Arab Emirates

This work details the study, development, and experimental implementation of GPS aided strapdown inertial navigation system (INS) using commercial off-the-shelf low-cost inertial measurement unit (IMU). The data provided by the inertial navigation mechanization is fused with GPS measurements using loosely-coupled linear Kalman filter implemented with the aid of MPC555 microcontroller. The accuracy of the estimation when utilizing a low-cost inertial navigation system (INS) is limited by the accuracy of the sensors used and the mathematical modeling of INS and the aiding sensors' errors. Therefore, the IMU data is fused with the GPS data to increase the accuracy of the integrated GPS/IMU system. The equations required for the local geographic frame mechanization are derived. The direction cosine matrix approach is selected to compute orientation angles and the unified mathematical framework is chosen for position/velocity algorithm computations. This selection resulted in significant reduction in mechanization errors. It is shown that the constructed GPS/IMU system is successfully implemented with an accurate and reliable performance. © 2010 Springer Science+Business Media B.V.

关键词： Inertial navigation systems

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Analysis and control of the bifurcation in a Morris-Lecar neuron via a washout filter-aided dynamic control law

Analysis and control of the bifurcation in a Morris-Lecar ne...

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International Conference on Control, Automation and Systems ( ICCAS)

作者： Le Hoa Nguyen Keum-Shik Hong School of Mechanical Engineering Pusan National University Busan South Korea Department of Cogno-Mechatronics Engineering (W.C.U. program) Pusan National University Busan South Korea

The bifurcation phenomena in the neuronal system are known as to cause many neuronal diseases such as epilepsy, Alzheimer's disease, Parkinson's disease, or schizophrenia, etc. Therefore, understanding the dynamics and manipulation of bifurcation characteristics of the neuronal system are promising to provide diagnostic and therapy trajectories for these diseases. In this paper, we address the problem of bifurcation control of a Morris-Lecar (ML) neuron model. First, we analysis the dynamic behavior of a ML model, the stability of equilibrium points and the occurrence of Hopf bifurcations in the ML model are investigated. Second, we employ a washout filter-aided dynamic control law to achieve two bifurcation control objectives: stabilize the original Hopf bifurcation point and advance the Hopf bifurcation point toward a desired point. Finally, in order to verify the effectiveness of the proposed methods, numerical simulations are performed, the results of which are provided herein.

关键词： Bifurcation Mathematical model Eigenvalues and eigenfunctions Control systems Stability analysis Diseases

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Characterization of shape and deformation of tympanic membranes by dual-wavelength lensless digital holography

Characterization of shape and deformation of tympanic membra...

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2011 SEM Annual Conference on Experimental and Applied Mechanics

作者： Lu, Weina Furlong, Cosme Rosowski, John J. Cheng, Jeffrey T. Merchant, Saumil N. Center for Holographic Studies and Laser Micro-mechaTronics Department of Mechanical Engineering Worcester Polytechnic Institute Worcester MA United States Eaton-Peabody Laboratory Massachusetts Eye and Ear Infirmary Boston MA 02114 United States Speech and Hearing Bioscience and Technology Program MIT-Harvard Division of Health Sciences and Technology Cambridge MA United States

ISBN: (纸本)9781461402183

We are developing an advanced computer-controlled digital optoelectronic holographic system (DOEHS) with the ability to measure both shape and acoustically induced deformations of the tympanic membrane of several species, including humans. The DOEHS consists of laser delivery (LD), optical head (OH), and computing platform (CP) subsystems. The LD subsystem houses two tunable near-infrared laser sources, an acoustic modulator to enable stroboscopic illumination, and laser-to-fiber mechanisms to couple light into one single mode polarization maintaining fiber. The output of the LD subsystem is delivered into the OH subsystem through the polarized maintaining fiber (PM), which is arranged to perform imaging and measurements by phase-shifting lensless digital holography. A high-resolution digital camera, contained within the OH subsystem, is used for image recording at high-rates while the CP subsystem acquires and processes images in either time-averaged or double-exposure holographic modes. Shape measurements are performed by double-exposure mode with a different laser source used in each one of the exposures whereas deformation measurements are obtained by using a single laser source. We present preliminary results of our investigations of acoustically induced motions on tympanic membrane and the transfer of these motions to the ossicular chain, including results on sample preparation for measurements with the DOEHS.

关键词： Infrared devices

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Extended general linear model based on-line brain activation mapping

Extended general linear model based on-line brain activation...

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IEEE International Symposium on Biomedical Imaging

作者： Xiao-Su Hu Keum-Shik Hong Shuzhi Sam Ge Myung-Yung Jeong Department of Cogno-Mechatronics Engineering (W.C.U. program) Pusan National University Busan South Korea School of Mechatronic Engineering Pusan National University Busan South Korea Department of Electrical & Computer Engineering National University of Singapore Singapore

ISBN: (纸本)9781424441273

Near-infrared spectroscopy (NIRS) is a non-invasive neuroimaging technique that recently has been used to measure changes in cerebral blood oxygenation associated with brain activity. Numbers of research groups have applied general linear model (GLM) based method to analyze the NIRS data. However, classical GLM based method cannot provide on-line analysis. Therefore, its usage is constrained in processing NIRS data where real-time feedback is required. In the present paper, we are proposing a framework for NIRS based on-line brain activation mapping. The framework employs an extended GLM with coefficients updated by an extended Kalman particle filter for on-line brain activation mapping. A set of data recorded in a finger tapping experiment was studied using the proposed framework. The results so obtained, suggested that the method can effectively locate brain activation areas on-line with the noisy NIRS signal, thereby demonstrating its potential for real-time NIRS-based brain imaging applications.

关键词： Real time systems Brain modeling Noise Imaging Time series analysis Hemodynamics

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PDMS through-hole fabrication by soft lithography using CH4/He atmospheric RF plasma surface treatment

PDMS through-hole fabrication by soft lithography using CH4/...

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IEEE International Conference on Micro Electro Mechanical Systems

作者： Jongchan Choi Kyeong-Hwan Lee Ji A Choi Sun Hwa Lee Sung Yang School of Information and Mechatronics Gwangju Institute of Science and Technology Gwangju South Korea Department of Rural and Biosystems Engineering Chonnam National University Gwangju South Korea Institute of Medical System Engineering Gwangju Institute of Science and Technology Gwangju South Korea Department of Nanobio Materials and Electronics School of Information and Mechatronics Graduate Program of Medical System Engineering Gwangju Institute of Science and Technology Gwangju South Korea

This paper presents a PDMS micro through-hole molding method by simple soft lithography process in which the surface of a master mold and a substrate is treated by atmospheric CH 4 /He RF plasma to feature hydrophobic property on the surface. Rectangular and circular-shaped PDMS micro through-hole layers are made by the proposed fabrication method. As one of the applications of the PDMS micro through-hole layer for multi-layered systems, a radial concentration gradient generator including a micro through-hole layer is constructed and its performance is tested. The micro through-holes fabricated by the proposed method are well-defined. The concentration gradients measured in radial directions are in a similar level. Also, the tearing problem, which is often happened in spin-coating and lift-off molding methods, is not observed during the fabrication process of the PDMS micro through-holes. Therefore, we believe that the proposed fabrication method contributes to improve the technology for PDMS through-hole fabrication.

关键词： Surface treatment Fabrication Plasmas Substrates Helium Generators Radio frequency

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Multi-band printed antennas impedance characterization using a FDTD/WP-PML based methodology

Multi-band printed antennas impedance characterization using...

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SBMO/IEEE MTT-S International Conference on Microwave and Optoelectronics (IMOC)

作者： Glaucio Lopes Ramos Cássio Gonçalves do Rego Graduate Program in Electrical Engineering Department of Telecommunication and Mechatronics Engineering Federal University of Minas Gerais Federal University of São João del-Rei Ouro Branco Minas Gerais Brazil Department of Electronics Engineering Federal University of Minas Gerais Belo Horizonte Minas Gerais Brazil

This paper presents the results of the application of a FDTD technique to determinate the return loss parameter of two printed multi-band antennas. The impedance characterization of wide-band printed antennas with lossy substrates is introduced by means of an approach based on FDTD method and the WP-PML absorbing boundary condition. It was used a simple voltage source model where an excitation plane with an Gaussian vertical electrical field was imposed to a rectangular area just below the structure to be analyzed. Preliminary results obtained for the return loss of MIMO multi-band antennas are compared to those determined from other FDTD-based methods available in the scientific literature in order to show the applicability of the methodology that has been developed herein. The results obtained for return loss parameter showed good agreements between the technique proposed by this work and the results previous done.

关键词： Antennas Time domain analysis Finite difference methods Antenna measurements Geometry Boundary conditions

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