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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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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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Silica nanochannel device for pH sensing based on surface charge density changes

Silica nanochannel device for pH sensing based on surface ch...

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2010 10th IEEE Conference on Nanotechnology, NANO 2010

作者： Lee, Sang Young Yoon, Sang Youl Lee, Kyeong-Hwan Yang, Sung Department of Nanobio Material and Electronics School of Information and Mechatronics GIST Korea Republic of Graduate- Program of Medical System Engineering Biomedical Micro/Nano Device Laboratory GIST Korea Republic of

ISBN: (纸本)9781424470334

This paper demonstrates a novel micro/nano fluidic device for continuous pH sensing of small fluid volumes. The working principle of the device is based on the change of the surface charge density within the silica nano channels with respect to the pH levels of the electrolyte. In order to measure pH levels of various solutions, AC potential is applied along the silica nanochannels which have 50 nm depth, 2 μm width, and 30 μm length. The running current along the nanofluidic channels is directly measured with respect to pH levels. It was found that the running current is inversely proportional to pH levels regardless of ion concentrations. ©2010 IEEE.

关键词： Electrolytes

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A novel peristaltic micropump using three wings with different widths for fluid circulation

A novel peristaltic micropump using three wings with differe...

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14th International Conference on Miniaturized Systems for Chemistry and Life Sciences 2010, MicroTAS 2010

作者： Mun, Byung Phil Park, Chang Ju Yoo, Sung Keun Lee, Jong Hyun School of Information and Mechatronics GIST Gwangju Korea Republic of Graduate Program of Medical System Engineering GIST Gwangju Korea Republic of Dept. of Nanobio Materials and Electronics GIST Gwangju Korea Republic of

ISBN: (纸本)9781618390622

This paper reports a novel micropump to effectively rotate fluid in a circular channel. The proposed micropump having different wing widths, which squeezes the flexible part of the fluidic channel at a different time interval, provides a peristaltic effect with a single pneumatic pressure source. This allows simple operation and easy integration with a micro total analysis system (μ-TAS).

关键词： Flexible structures

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Exact linearization and fuzzy logic applied to the control of a Magnetic Levitation System

Exact linearization and fuzzy logic applied to the control o...

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2010 6th IEEE World Congress on Computational Intelligence, WCCI 2010

作者： Torres, Luiz H. S. Vasconcelos Jr., Carlos A.V. Schnitman, Leizer De Souza, J. A. M Felippe Control Lab Post-graduate Program in Mechatronics Federal University of Bahia Rua Aristides Novis 40.210-630 Salvador Bahia Brazil Electromechanical Engineering Department University of Beira Interior Covilhã Portugal

ISBN: (纸本)9781424469208

In recent years the area of nonlinear control systems has been the subject of many studies. Computational developments have enabled more complex applications to provide solutions to nonlinear problems. The purpose of this paper is to use a combination of two techniques to control a nonlinear system: the Magnetic Levitation System. First, the exact linearization technique with state feedback is applied to obtain a linear system. Second, the linearization is made via direct cancellation of nonlinear functions, which represent the phenomenological model of the system. Finally, to deal with the presence of uncertainty in the system model, an adaptive controller is used. The controller is based on fuzzy logic to estimate the functions that contain the nonlinearities of the system. The fuzzy system is a zero-order Takagi-Sugeno-Kang structure and the adaptive controller is implemented in a simulated environment (Matlab Simulink ©). The methodology guarantees the convergence of the estimates to their optimal values, and in turn the overall stability of the system. The results show the controller output signal tracks a reference input signal. For future work this adaptive controller should be implemented in a real physical system. © 2010 IEEE.

关键词： Adaptive control systems

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Microfluidic device for refractive index measurement of fluid sample

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Procedia engineering 2010年 5卷 1340-1343页

作者： Sang Youl Yoon Sung Yang Graduate-program of Medical System Engineering GIST Gwangju Republic of Korea School of Information & Mechatronics GIST Gwangju Republic of Korea Department of Nanobio Materials and Electronics GIST Gwangju Republic of Korea

This paper represents a novel microfluidic device for simple refractive index (RI) measurement of fluid sample with sub microliter volume. The defocusing imaging technique using a three pinhole aperture plate is implemented for the refractive index measurement. For the self-calibration, the microfluidic device has a measurement region and a self-calibration region, and both regions are designed to be captured on single image frame. Thus, the refractive index of a sample fluid is automatically calculated with the self-calibration. For the demonstration of the proposed device, standard refractive index liquids with the refractive indices of 1.300, 1.400, 1.500, 1.600 and 1.700 are used. The measured refractive index has the maximum deviation of 0.0036 (0.24%) from the standard refractive index values.

关键词： Refractometer Microfluidic device Defocusing imaging Three pinhole Self-calibration Refractive index measurement

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Biogeography-Based Optimization Combined with Predator-Prey Approach Applied to Economic Load Dispatch

Biogeography-Based Optimization Combined with Predator-Prey ...

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Brazilian Symposium on Neural Networks

作者： Marsil de Athayde Costa e Silva Leandro dos Santos Coelho Undergraduate Course in Mechatronics Engineering Pontifical Catholic University of Paraná (PUCPR) Curitiba Paraná Brazil Industrial and Systems Engineering Graduate Program Pontifical Catholic University of Paraná (PUCPR) Curitiba Paraná Brazil

Economic Load Dispatch (ELD) problems are nonlinear constrained problems which occupy an important role in the economic operation of power system. Recently, as an alternative to the conventional mathematical approaches, evolutionary algorithms have been given much attention by researchers due to their ability to find good solutions in ELD problems. In this paper, a biogeography based-optimization approach is validated. Biogeography is the study of the geographical distribution of biological organisms. Furthermore, a new approach of the biogeography based-optimization methodology combined with predator-prey approach were proposed and validated for two test systems consisting of 15 and 20 generation units (thermal generators), respectively. Simulation results are compared with those of other studies reported in the literature.

关键词： Optimization Biogeography Mathematical model Generators Economics Convergence Equations

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Mechanical cell lysis chip with ultra-sharp nano-blade array fabricated by crystalline wet etching of (110) silicon

Mechanical cell lysis chip with ultra-sharp nano-blade array...

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IEEE International Conference on Micro Electro Mechanical Systems

作者： Sung-Sik Yun Sang Youl Yoon Jong-Hyun Lee Sung Yang Department of Nanobio Materials and Electronics GIST Gwangju South Korea Graduate Program of Medical System Engineering GIST Gwangju South Korea Department of Mechatronics GIST Gwangju South Korea Gwangju Institute of Science and Technology Gwangju KR

ISBN: (纸本)9781424457618;9781424457649

This paper presents a mechanical cell lysis microfluidic chip with an ultra-sharp nano-blade array fabricated by simple and cost effective crystalline wet etching of (110) silicon. The ultra-sharp nano-blade array is simply formed by the undercutting during the crystalline wet etching process. The sharpness of the silicon nano-blade is less than 10 nm after the undercutting. EL4 mouse T-lymphoma cells are used for the demonstration of the mechanical lysis chip, and the cells are easily disrupted by the silicon nano-blade array without helping of additional reagents or electrical sources. The time-resolved observation of the mechanical cell lysis shows that the developed silicon nano-blade array is enough to easily disrupt the cell membrane even at very low flow rate of 0.7 ¿¿/hr.

关键词： Crystallization Wet etching Silicon

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Impedance measurement of normal and cancerous human breast cells using a microfluidic tunnel

Impedance measurement of normal and cancerous human breast c...

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IEEE SENSORS

作者： Giseok Kang Sung-Kil Lee Sung Keun Yoo Sung Yang Jong-Hyun Lee Graduate-program of Medical System Engineering Gwangju Institute of Science and Technology Gwangju South Korea School of Information and Mechatronics Gwangju Institute of Science and Technology Gwangju South Korea Department of Nanobio Materials and Electronics Gwangju Institute of Science and Technology Gwangju South Korea Gwangju Institute of Science and Technology Gwangju KR

In this paper, a novel microelectrical impedance spectroscopy (μEIS) with three-dimensional interdigitated electrodes (3D-IDE) is developed to differentiate normal and cancerous cells. The device utilizes a microfluidic tunnel structure, which forces cells to be squeezed. Thus, the enlarged contact area between cells and electrodes allows the device to measure the intrinsic electrical signal of the cells with a higher sensitivity than a noncontact case. The cell squeezing is realized by fabricating smaller microfluidic channel than cell size. The electrical impedances are measured through 3D-IDE. The device well distinguishes normal human breast cell (MCF-10A) and early-stage human breast cancer cell (MCF-7) with a phase difference of 1.42° at 500 kHz. The proposed device also features a high repeatability because the phase change is as small as 0.27° (which is sufficiently smaller than the phase difference between normal and cancer cell) before and after the each cell assay.

关键词： Impedance Electrodes Microfluidics Impedance measurement Breast cancer

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System identification of magneto-rheological damper using group method of data handling (GMDH)

System identification of magneto-rheological damper using gr...

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2009 6th International Symposium on mechatronics and its Applications, ISMA 2009

作者： Assaleh, Khaled Shanableh, Tamer Kheil, Yasmeen Abu Department of Electrical Engineering American University of Sharjah United Arab Emirates Department of Computer Science and Engineering American University of Sharjah United Arab Emirates Mechatronics Graduate Program American University of Sharjah United Arab Emirates

ISBN: (纸本)9781424434817

In this paper Group Method of Data Handling (GMDH) technique is implemented and applied to the system identification problem of a Magneto-Rheological (MR) damper. GMDH networks are used to approximate the forward and inverse dynamic behaviors of a MR damper. The difficulty of this identification problem stems from the inherent hysteretic and highly nonlinear dynamics of MR dampers. The GMDH-based solution exhibits comparable identification accuracy in both the forward and inverse models as compared to state-of-the-art more computationally extensive solutions. © 2009 IEEE.

关键词： Inverse problems

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