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2007 International Conference on Electromagnetics in Advanced Applications, ICEAA'07

作者： El-Kahlout, Y. Kiziltas, G. Mechatronics Engineering Program Sabanci University Orhanli 34956 Tuzla Istanbul Turkey

ISBN: (纸本)1424407672

Design optimization has become an inevitable task to accommodate for stringent performance requirements of wireless applications. Existing techniques are mainly restricted to parametric design of the size or more recently material of the device. However, to allow for global exploration of novel designs, large-scale design optimization problems need to be solved possibly via efficient reanalysis based on electromagnetic analysis tools. Needless to say, reanalysis is very time consuming, hence is the bottleneck of iterative synthesis problems.. In this paper, a simple but effective technique based on Bayesian trained rational functions is introduced to lower the number of reanalysis calls to a full wave analysis tool. It allows for robust interpolation of frequency based response data, i.e. return loss. The technique is also implemented on a design example. © 2007 IEEE.

关键词： Rational functions

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Physical Effects of Mechanical Processes on Bi-2223 Tapes

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Journal of Electronic Science and Technology 2008年第2期000卷

作者： Wu-Ming Chen Jian-Xun Jin Mustafa Yavuz Wu-Ming Chen (Center of Applied Superconductivity and Electrical Engineering School of Automation Engineering University of Electronic Science and Technology of China Chengdu 610054 China Mechatronics Program Mechanical Engineering Department University of Waterloo Waterloo ON N2L 3G1 Canada.) Jian-Xun Jin (Center of Applied Superconductivity and Electrical Engineering School of Automation Engineering University of Electronic Science and Technology of China Chengdu 610054 China.) Mustafa Yavuz (Mechatronics Program Mechanical Engineering Department University of Waterloo Waterloo ON N2L 3G1 Canada.)

The effects of intermediate mechanical deformation (IMD) and bending processing on Bi-2223 tapes were studied. Bi-2223 tapes were manufactured by powder-in-tube process with an IMD. Normal rolling (NR), pressing (P) and sandwich rolling (SR) with different reduction rate were used in the IMD. And there were an optimum reduction rate existing for the three MID techniques, at which critical current reached maximum. Critical current densities Jc of Bi-2223 crystals were measured with an applied magnetic field B respectively parallel to ab face and c axis. Relations of Jc dependences of reduction rate and superconducting materials density D were respectively studied and showed a Gaussian distribution law. Maximum pinning force density Fmax and irreversible magnetic field Birr were introduced to describe the effects of mechanical processing. Analysis of experimental results showed that Jc, Fmax and Birr were linear dependence on D. Obviously, increasing D was a vital way to enhance Jc. Bending experiments were performed for SR tapes sheathed by Ag and Ag/Sb and Ag/Mg alloy, respectively. Silver alloy sheathed tapes showed better bending properties than pure silver sheathed one. Therefore, silver alloy sheathed, optimum reduction rate of IMD, and increasing D for Bi-2223 tapes'' applications were important technical strategies to enhance their mechanical, electrical, and magnetic properties.

关键词： Bending Bi-2223 tape critical current deformation density

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Characterization of collagen/PEO 600K for tissue engineering scaffold 3

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3rd Kuala Lumpur International Conference on Biomedical engineering, Biomed 2006

作者： Mohd Nasir, Nashrul Fazli Sahidan, S.I. Rampado, M. Raha, M.G. Kadri, N.A. Mohd. Zain, N. Biomedical Electronics Engineering Program School of Mechatronics Northern Malaysia University College of Engineering Kangar Malaysia Department of Biomedical Engineering University Malaya Kuala Lumpur Malaysia

ISBN: (纸本)9783540680161

In this study, a new material which is collagen/ poly (ethylene oxide) (PEO) blend was developed to determine its possibility as a promising material for tissue scaffold. PEO with average molecular weight of 600,000 and collagen originated from calf skin were dispersed in 0.1 M acetic acid to prepare a concentration of 1 wt% for PEO and 0.15 wt% for collagen. The collagen-PEO600K blend film was then obtained by solution casting method. The morphology and the phase structure of the blends were studied using SEM and XRD. SEM results shown that by having certain ratio of collagen and PEO, the membrane began to developed porous structures which are possible to assist tissue attachment on the scaffold. The X-ray diffractograms demonstrate PEO 600K influences on the blend thus enhancing crystallinity of collagen which explained the membrane morphological structure. Therefore, we concluded that the crystallinity of PEO in the blend is crucial to produce desirable morphological structure of the membrane which is required for a reliable tissue scaffold. © Springer-Verlag Berlin Heidelberg 2007.

关键词： Collagen

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Analog sliding mode controller for position tracking of piezoelectric actuators

Analog sliding mode controller for position tracking of piez...

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Mediterranean Conference on Control and Automation (MED)

作者： S. Yannier A. Sabanovic Faculty of Engineering and Natural Sciences Mechatronics Engineering Program Sabanci University Istanbul Turkey

In this work, analog application for the sliding mode control (SMC) of piezoelectric actuators is presented. DSP application of the algorithm suffers from ADC and DAC conversions and faces speed limitations. Moreover, piezoelectric actuators are known to have very large bandwidth close to the DSP operation frequency. Therefore, with the direct analog application, improvement of the performance is expected and high frequency operation will be achieved. First an appropriate SMC is designed to have continuous control output and then experimental results for position tracking using DSP and analog application are presented for comparison.

关键词： Sliding mode control Piezoelectric actuators Digital signal processing Open loop systems Atomic force microscopy Bandwidth Frequency Aerospace materials Hysteresis Capacitive sensors

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Intelligent Access Control Mechanism for Ubiquitous Applications

Intelligent Access Control Mechanism for Ubiquitous Applicat...

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International Conference on Computer and Information Science (ACIS)

作者： Tae-Hum Lim Sang-Uk Shin Department of Interdisciplinary Program of Mechatronics Engineering Pukyong National University South Korea

As computing technology becomes more pervasive and mobile services are deployed, ubiquitous applications will need flexible access control mechanisms and more suitable access control decisions. Despite the advances in access control approaches applicable to ubiquitous applications, there remain issues that impede the development of effective access control for ubiquitous applications. Amongst them are the lack of context-based models for access control, and reliance on identity or capability-based access control schemes. In this paper, we propose intelligent system using a neural network algorithm for ubiquitous applications, which extends the role based access control with context constraints. Also we apply a neural network algorithm for making access decisions.

关键词： Intelligent control Access control Neural networks Mobile computing Intelligent networks Personal digital assistants Application software Intelligent systems Permission Pervasive computing

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Novel optoelectronic methodology to facilitate development of MEMS

Novel optoelectronic methodology to facilitate development o...

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63rd Annual Meeting of the Institute of Navigation 2007

作者： Pryputniewicz, Ryszard J. Marinis, Ryan T. Klempner, Adam R. Hefti, Peter Mechanical Engineering Department CHSLT- Center for Holographic Studies and Laser Micro-mechatronics Worcester Polytechnic Institute Worcester MA 01609 United States Department of Mechanical Engineering CHSL WPI NEST Program WPI Department of Electrical Computer Engineering SPIE SEM MEMS Nanotechnology Division SEM

ISBN: (纸本)1604232862

Development of microelectromechanical systems (MEMS), and structures they interact with, especially for navigation applications constitutes one of the most challenging tasks in today's micromechanics. In addition to design, analysis, and fabrication capabilities, this task also requires advanced test methodologies for determination of functional characteristics of MEMS to enable verification as well as refinement and optimization of their designs. More specifically, development of MEMS requires sophisticated design, analysis, fabrication, testing, and characterization tools. These tools can be categorized as analytical, computational, and experimental. Solutions using the tools from any one category alone do not usually provide necessary information on MEMS and extensive merging, or hybridization, of the tools from different categories is used. One of the approaches employed in the development of MEMS, as well as other complex structures of contemporary interest, is based on a combined use of the analytical, computational, and experimental solutions (ACES) methodology. Development of this methodology was made possible by recent advances in optoelectronic methodology, which was coupled with the state-of-the-art computational methods, to offer a considerable promise for effective development of the design of MEMS. This approach facilitates characterization of dynamic and thermomechanical behavior of MEMS components, packages for MEMS, and other complex material structures. In this paper, we describe the novel optoelectronic methodology that facilitates development of MEMS and illustrate its use with representative examples by emphasizing their functional operation/ characteristics, reliability, and durablity.

关键词： Optoelectronic devices

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Modelling of an electrically powered helicopter prototype

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2nd International Conference on Dynamics, Instrumentation and Control, CDIC 2006

作者： Benitez-Morales, José Gerardo Castro-Linares, Rafael Liceaga-Castro, Eduardo Engineering Program in Mechatronics Polithecnic University of Pachuca Pachuca Hidalgo Mexico Department of Electrical Engineering CINVESTAV Av. IPN No. 2508 Col. San Pedro Zacatenco Maxico City 07360 Mexico ESIME.IPN Ticomán Unit Maxico City Mexico

The dynamics modelling of an electrically powered helicopter prototype is presented. The modelling includes the dynamics of the rotor thrust given by a DC electrical motor. Some experimental results are shown for a ve... 详细信息

ISBN: (纸本)9812708057

关键词： Helicopters

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Fundamental techniques of mobile robot for inspection of CAS in oil tanker

Fundamental techniques of mobile robot for inspection of CAS...

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9th IASTED International Conference on Control and Applications, CA 2007

作者： Chang, Woo Son Seung, Heui Lee Seok, Jo Go Min, Cheol Lee Mechanical and Intelligent Systems Engineering Pusan National University Jangjeon 2-dong Geumjeong-gu Busan Korea Republic of Interdisciplinary Program in Mechatronics Pusan National University Jangjeon 2-dong Geumjeong-gu Busan Korea Republic of Division of Mechanical Engineering Dongeui Institute of Technology Yangji5Ro Busanjin-gu Busan Korea Republic of School of Mechanical Engineering Pusan National University Jangjeon 2-dong Geumjeong-gu Busan Korea Republic of

ISBN: (纸本)9780889866652

It is dangerous that a technician the inner parts of an oil tanker for defects and conditions because of many harmful gases, complex structures, etc. However, these inspections are necessary to many oil tankers of old years. In this reason, we proposed the fundamental techniques of mobile robot for inspection of CAS in oil tanker. The developed CAS inspection mobile robot has four modules, a measurement module of oil tanker's thickness, a corrosion inspection module, a climbing module of the surface on a wall, and a monitoring module. In order to getting over at a right angled path, the driving control algorithm was developed. And, magnetic wheels were used to move the surface of a wall. This study constructed a communication network (Bluetooth) and the monitoring program to operate the developed mobile robot from remote sites. In order to evaluate the inspection ability, the experiments using developed mobile robot have been conducted.

关键词： Mobile robots

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Sliding mode control application to nano positioners

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Lecture Notes in Control and Information Sciences 2006年 334卷 395-421页

作者： Sabanovic, Asif Abidi, Khalid Önal, Çaǧdaş Sabanci University Faculty of Engineering Natural Sciences Mechatronics Program Turkey

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A Novel 1.5 $^primeprime$ Quadruple Antenna for Tri-Band GPS Applications

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IEEE Antennas and Wireless Propagation Letters 2006年 5卷 224-227页

作者： Y. Zhou S. Koulouridis G. Kiziltas J. L. Volakis Electroscience Laboratory Electrical and Computer Engineering Department Ohio State Uinversity Columbus OH USA Mechatronics Program of the Faculty of Engineering and Natural Sciences Sabanci University Istanbul Turkey

A new global positioning system (GPS) antenna is proposed to cover the three GPS bands (L1, L2, and L5, namely 1575, 1227, and 1176 MHz) with the L5 band to be added after 2006. The developed antenna size is only $1.5^primeprimetimes 1.5^primeprime$ in aperture corresponding to $lambda/7timeslambda/7$ $(lambda=hboxfree hboxspace hboxwavelength)$ and $lambda/13 hboxthick$. Quadrature feeding is employed to ensure right-hand circular polarized (RHCP) radiation. The final miniature antenna exhibits a gain greater than 2 dBi, and to our knowledge this is the smallest such size for circular polarized (CP) operation covering all three bands. Detailed parametric simulations leading to the best design along with measurements for the constructed antenna are presented.

关键词： Global Positioning System Conductors Dielectric substrates Bandwidth Resonance Aperture antennas Polarization Shape Permittivity Antenna measurements

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