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IEEE International Conference on Computational Intelligence for Measurement Systems and Applications (CIMSA)

作者： Nazish Irfan Mustapha C. E. Yagoub Khelifa Hettak School of Electrical Engineering and Computer Science (EECS) University of Ottawa Ottawa Canada Communication Research Center Ottawa Canada

Radio Frequency Identification (RFID) systems, due to recent technological advances, have been used for various advantages in industry like production facilities, supply chain management etc. However, sometimes this requires a dense deployment of readers to cover the working area. Without optimizing reader's location and number, many of them will be redundant, reducing the efficiency of the whole RFID system. There are many algorithms proposed to solve this redundant reader problem, but all existing algorithms are based on omnidirectional reader antenna pattern, which is not practical. In this paper, a genetic algorithm is used to optimize the antenna beam to eliminate redundant reader based on real directional reader antenna pattern.

关键词： Radiofrequency identification Genetic algorithms Directive antennas Biological cells Optimization Antenna radiation patterns

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Design and FDTD analysis of single-band and dual-band antennas for RFID and WiMAX applications

Design and FDTD analysis of single-band and dual-band antenn...

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International Conference on Software, Telecommunications and computer Networks (SoftCOM)

作者： Nazish Irfan Mustapha C. E. Yagoub Khelifa Hettak School of Electrical Engineering and Computer Science (EECS) University of Ottawa Ottawa Canada Communication Research Center Ottawa Canada

In this paper, inset fed microstrip antennas for single band and dual-band operation are proposed. This design aims to achieve single band operation for RFID at 2.4 GHz as well as dual-band operation at 2.4 GHz for RFID and 3.5GHz for WiMAX applications. Simulation results exhibit a return loss of -27dB for single-band operation (2.4 GHz) while at and -20dB and -12.87dB for 2.4GHz and 3.5GHz (for dual-band) respectively. The Finite Difference Time Domain (FDTD) technique was used to analyze both antennas showing close agreement with the simulated results.

关键词： Microstrip antennas Dual band Microstrip Finite difference methods Patch antennas Time domain analysis

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38.4: Full-color patterning of quantum dot (QD) light-emitting diodes using QD transplanting techniques

38.4: Full-color patterning of quantum dot (QD) light-emitti...

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作者： Cho, Hyunduck Lee, Changhee Kwak, Jeonghun Shin, Dong-Myung Bae, Wan Ki Lim, Jaehoon Char, Kookheon Lee, Seonghun School of Electrical Engineering and Computer Science Semiconductor Research Center Seoul National University Seoul 151-744 Korea Republic of Department of Electronics Engineering Dong-A University Busan 604-714 Korea Republic of Department of Chemical Engineering Hongik University Seoul 121-791 Korea Republic of School of Chemical and Biological Engineering Intelligent Hybrids Research Center Seoul National University Seoul 151-744 Korea Republic of School of Chemistry Seoul National University Seoul 151-747 Korea Republic of

We provide simple and versatile QD transplanting method, which allows well-defined QD patterns down to a few micrometers and also provides compatibility with conventional device fabrication process and device architecture. We also demonstrate red, green, and blue QLEDs with transplanted QD active layers and characterize them in systematic correlation study between QD pattern morphology and device performances. © 2011 SID.

关键词： Semiconductor quantum dots

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An application of fractional intelligent robust controller for electromechanical valve

An application of fractional intelligent robust controller f...

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2011 World Congress on Information and Communication Technologies, WICT 2011

作者： Banerjee, Tribeni Prasad Saha, Suman Das, Swagatam Abraham, Ajith Dept. of Electronics and Telecommunication Engineering Jadavpur University Kolkata 700 032 India CSIR-Central Mechanical Engineering Research Institute Drives and Control System Laboratory Durgapur-713209 West-Bengal India Scientific Network for Innovation and Research Excellence WA United States EU Center of Excellence Faculty of Electrical Engineering and Computer Science VSB - Technical University of Ostrava Czech Republic

ISBN: (纸本)9781467301251

The paper analyzed and model of a fault tolerant electromechanical controlled worm gear driven fuel shut off valve for aerospace application. The analysis is mainly on design a reduced order fractional controller. This is for controlling the velocity of worm gear so that the friction torque due to uneven rotational speed can be avoided. Because with the friction and stiction and backlash the valve system performance is reduced and more and more unstable this leads the system to failure. The proposed controller can provide robustness against the uncertain loading torque and system parameter. © 2011 IEEE.

关键词： controllers

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A novel method for Centromere and length detection in microscopic images of human chromosomes

A novel method for Centromere and length detection in micros...

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Iranian Conference of Biomedical engineering (ICBME)

作者： Sahar Jahani S. Kamaledin Setarehdan Faculty of Biomedical Engineering Science and Research Branch Islamic Azad University Tehran Iran Control and Intelligent Processing Center of Excellence School of Electrical and Computer Engineering College of Engineering University of Tehran Tehran Iran

Many genetic disorders or abnormalities that may occur in the future generations can be predicted through analyzing the shape and morphological characteristics of the human chromosomes. This is usually carried out by an expert, inspecting the Karyotype of the patients. A Karyotype is a particular table that presents the chromosome images in a standard format. To generate a Karyotype, it is necessary to identify each of the 23 pairs of the chromosomes within the microscopic images first. The main step to automate this procedure is the definition of some morphological features for each chromosome. The most common features used for chromosomes identification includes the location of the Centromere and the length of the chromosome. Many other important features, such as Centromeric Index, are usually extracted from the Centromere and length. In this paper, a novel and effective algorithm for Centromere locating and length calculation for the human chromosomes is presented. The proposed algorithm uses the fact that the centromere is the narrowest part of the chromosome. By defining a gray level mask (GLM), which is a linearly varying gray level image along the chromosome longitudinal direction and multiplying it to the binary version of the chromosome image, it is shown that the global minimum in the histogram of the resulted image indicates the location of the centromere. The data set used in this work was provided by the Tesi-Imaging srl in Milan, Italy. A mean value of the absolute error of 3.6 and 5.2 pixels was obtained in identification of the chromosome centromere and length respectively by the proposed method.

关键词： Biological cells Histograms Humans Microscopy Shape Biomedical engineering Biomedical imaging

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An online defect classification method for float glass fabrication

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Glass Technology: European Journal of Glass science and Technology Part A 2011年第5期52卷 154-160页

作者： Peng, Xiangqian Chen, Youping Liu, Huaiguang Xie, Jingming Gu, Chenlin Engineering Research Center of Numerical Control System School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China College of Mechanical and Electrical Engineering Central South University Changsha Hunan China

In float glass fabrication once defects are detected, recognition of the defect type is important for adjustment of the process conditions. Based on analysis of the float process conditions and float glass defects, this paper outlines an adaptive neural network based classification. Twelve features of the defect are picked out as the inputs for defect classification. The ReliefF method is used to evaluate the features, and the sequence of defect features is decided based on the results of the evaluation. The momentum term and adaptive learning rate is used to address the classification's disadvantage of slow learning speed and easy falling into a local minimum. Experiments and real application proves that the float glass defect classification presented here correctly recognizes defects in real time, and satisfies the requirements of float glass fabrication.

关键词： Defects

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A revision algorithm for invalid encodings in concurrent formation of overlapping coalitions

A revision algorithm for invalid encodings in concurrent for...

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作者： Zhang, Guofu Jiang, Jianguo Lu, Changhua Su, Zhaopin Fang, Hua Liu, Yang School of Computer and Information Hefei University of Technology Tunxi Road No. 193 Hefei 230009 Anhui China Information and Communication Engineering Postdoctoral Research Station Hefei University of Technology Hefei 230009 China National Engineering Research Center of Special Display Technology Hefei 230009 China Engineering Research Center of Safety Critical Industrial Measurement and Control Technology Ministry of Education Hefei 230009 China Management Science and Engineering Postdoctoral Research Station Hefei University of Technology Hefei 230009 China

In multi-agent systems, agents are inclined to form coalitions to improve individual performance and perform tasks more efficiently. However, the most existing researches assume that the desired outcome is a coalition structure that consists of disjoint coalitions where every agent that has joined a coalition is no longer available to join other coalitions, which leads to waste of resources. In a number of practical scenarios an agent may have to be involved in executing more than one task simultaneously, and distributing its resources to several completely different coalitions. To tackle such problems, we propose the concurrent formation of overlapping coalitions and introduce a two-dimensional binary encoding to search the coalition space. We mainly focus on the revision algorithm for invalid encodings. Specifically, by using the proposed revision algorithm, an agent may join in several different coalitions at the same time without any resource conflict. Moreover, we prove by mathematical induction that the proposed algorithm will not discard any invalid encoding and can revise any invalid encoding into a valid one. Finally, a contrast experiment is illustrated to demonstrate the proposed algorithm. © 2010 Elsevier B.V. All rights reserved.

关键词： Multi agent systems

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A motion-information-based vision-tracking system with a stereo camera on mobile robots

A motion-information-based vision-tracking system with a ste...

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IEEE Conference on Robotics, Automation and Mechatronics

作者： Wook Bahn Jaehong Park Chang-hun Lee Tae-il Kim Teajae Lee Muhammad Muneeb Shaikh Kwang-soo Kim Dong-il Cho Automation and Systems Research Institute (ASRI) and School of Electrical Engineering and Computer Science Seoul National University Seoul South Korea Department of Control and Instrumentation Engineering Hanbat National University Daejeon South Korea ASRI/Inter-university Semiconductor Research Center (ISRC) and School of Electrical Engineering and Computer Science Seoul National University Seoul South Korea

This paper presents a vision-tracking system for a mobile robot, using robot motion and stereo vision data. The mobile robot has an actuator module which pans and tilts an integrated stereo camera. The proposed system controls the actuator to maintain the line of sight of the stereo camera towards a stationary target by using the robot motion data. The robot motion data are obtained from a gyroscope and encoders of the mobile robot. The stereo vision data from the camera is used to compensate for errors in the motion measurements, and to prevent a long term error accumulation. This vision-based compensation is used only when the robot stops or moves slowly, because the long vision processing times can cause the loop time to overrun. The proposed system is experimentally evaluated while the robot moves on a trajectory.

关键词： Cameras Mobile robots Robot vision systems Robot kinematics Vectors Stereo vision

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Full-color patterning of quantum dot (QD) light-emitting diodes using QD transplanting techniques

Full-color patterning of quantum dot (QD) light-emitting dio...

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49th Annual SID Symposium, Seminar, and Exhibition 2011, Display Week 2011

作者： Cho, Hyunduck Lee, Changhee Kwak, Jeonghun Shin, Dong-Myung Bae, Wan Ki Lim, Jaehoon Char, Kookheon Lee, Seonghun School of Electrical Engineering and Computer Science Inter-University Semiconductor Research Center Seoul National University Seoul 151-744 Korea Republic of Department of Electronics Engineering Dong-A University Busan 604-714 Korea Republic of Department of Chemical Engineering Hongik University Seoul 121-791 Korea Republic of School of Chemical and Biological Engineering Intelligent Hybrids Research Center Seoul National University Seoul 151-744 Korea Republic of School of Chemistry Seoul National University Seoul 151-747 Korea Republic of

ISBN: (纸本)9781618390967

关键词： Semiconductor quantum dots

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Uniformity improvement by optimization of switching interface in bi-layer unipolar RRAM structure for low power new memory application

Uniformity improvement by optimization of switching interfac...

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International Symposium Semiconductor Device research (ISDRS)

作者： Kyung-Chang Ryoo Jeong-Hoon Oh Sunghun Jung Sungjun Kim Byung-Gook Park Inter-University Semiconductor Research Center (ISRC) and School of Electrical Engineering and Computer Science Seoul National University Seoul South Korea

RRAM is very promising due to many fascinating advantages as follows; fast writing/reading time, low programming power and multi bit storage for high density up to tera bit memory are possible [1]. But it is very difficult to satisfy all best resistive switching characteristics. There is a trade-off between reset current (I RESET ) and forming voltage (V FORMING ) in single layered cell structure as shown in fig. 1 (a). Fig. 1 (b) shows the initial resistance (R INITIAL ) as a function of reset resistance (R RESET ) and set resistance (R SET ) by using our fabricated NiO based unipolar RRAM cell. We have reported that V FORMING increases if R INITIAL is high enough, therefore it proves that R INITIAL needs to be lowered in order to lower operating condition [2]. However there is also a trade off. If R INITIAL is sufficiently low, sensing margin which means reset/set resistance ratio is also reduced. So, new ideas for satisfying both resistive switching conditions are needed. Figure 2 shows the typical I-V curves of forming (a) and reset/set switching (b) based on single layered unipolar RRAM structure by using RCB model [3] and figure 3 shows the illustration of bi layered RRAM cell structure. Lower layer (2 ND resistive layer) is acting as forming assistance layer for low power consumption. Upper layer (1 ST resistive layer) is used for controlling reset/set switching. Because resistive switching occurs at cell interface, interface engineering is very critical for improving resistive switching uniformity. Figure 4 illustrates the detailed tested metal - insulator-metal (MIM) cell structure. Charged particle which is source of CF path such as oxygen vacancy and metallic ion in resistive cell can be defined as conductive defect. Conductive defect fraction is varied from 0.05 (lower layer) to 0.025 (upper layer), respectively. Conductive defect fraction of reference cell is 0.05. The each layer rules and their actions for bi-layered RRAM cell structure are summa

关键词： Switches Periodic structures Resistance Educational institutions Statistical analysis Switching circuits

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