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作者： McDonald, Suzanne Holsapple, Raymond W. Kingston, Derek University of Maryland College Park MD 20742 United States Air Force Research Laboratory Wright-Patterson AFB OH 45433 United States Department of Electrical and Computer Engineering College Park MD 20742 United States Control Science Center of Excellence Wright-Patterson AFB OH 45433 United States

ISBN: (纸本)9781563479786

In this paper we consider an intelligence, surveillance and reconnaissance (ISR) mission where a human operator and a team of unmanned aerial vehicles (UAVs) are tasked to patrol a road. There are numerous inherent ISR benefits for patrolling a road. For example it might be beneficial to track the suspected movements of enemy troops in a forward operating location. Another example might be to gather intelligence that could then be used, possibly not in real time, to perform change detection, a method that might help with the detection of improvised explosive devices (IEDs). The layout of the road, with respect to a fixed known reference point, is assumed to be known a priori. For example the latitude and longitude coordinates of various points along the road would be sufficient. Most UAV autopilots make use of waypoint navigation to control the vehicle. This work investigates one method of optimally choosing the waypoints for the UAVs along the road. The cost function used minimizes the cross-track area error.

关键词： Cost functions

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Rapid automatic segmentation and visualization of teeth in CT-scan data

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Journal of Applied sciences 2009年第11期9卷 2031-2044页

作者： Akhoondali, H. Zoroofi, R.A. Shirani, G. Control and Intelligent Processing Center of Excellence Faculty of Engineering School of Electrical and Computer Engineering University of Tehran Tehran Iran Department of Oral and Maxillofacial Surgery Faculty of Dentistry Medical Science University of Tehran Tehran Iran

In this study, a fast automatic method is proposed for the segmentation and visualization of teeth in multi-slice CT-scan data of the head. The algorithm consists of five main procedures. In the first part, the mandible and maxilla are separated using maximum intensity projection in the y direction and a step like region separation algorithm. In the second part, the dental region is separated using maximum intensity projection in the z direction, thresholding and cropping. In the third part, the teeth are rapidly segmented using a region growing algorithm based on four thresholds which are used to distinguish between seed points, teeth and none teeth tissue. In the fourth part, the results are visualized using iso-surface extraction and surface and volume rendering. A semi-automatic method is also proposed for rapid metal artifact removal. Results on multiple dadasets have shown the success of the algorithm with the dental region separation and segmentation procedure taking an average of only 2.4 sec to complete for each jaw making it at least tens of times faster than any previously proposed method. © 2009 Asian Network for Scientific Information.

关键词： computerized tomography

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Fully automatic extraction of panoramic dental images from CT-scan volumetric data of the head

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Journal of Applied sciences 2009年第11期9卷 2106-2114页

In this study, a fully automatic technique is proposed for the extraction of panoramic dental images from CT-scan images of the teeth. The process is performed in three steps: Mandibular region isolation, mandibular curve creation and panoramic image extraction. First the mandibular region is isolated. To do this the maxilla and mandible are separated from each other by finding the slice separating them. Then an image of the maximum intensity projection of the slices containing the mandible is obtained. The projection of the mandible is then isolated from the other bones. Using the isolated mandible region an initial curve is created. Nine control points are then selected on the curve. These control points are used to create a fine curve using cubic splines. The formula for each spline segment is used to find the perpendicular lines to the spline on each point on the spline. These perpendicular lines are then used in all slices (mandible and maxilla) to create the panoramic images. The algorithm has many advantages over earlier methods. Results using multiple datasets have shown that the algorithm is robust. © 2009 Asian Network for Scientific Information.

关键词： computerized tomography

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Hybrid superconducting fault current limiter of the first half cycle non-limiting type

Hybrid superconducting fault current limiter of the first ha...

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作者： Lee, Gyeong-Ho Park, Kwon-Bae Sim, Jungwook Kim, Young-Geun Oh, Il-Sung Hyun, Ok-Bae Lee, Bang-Wook Electrotechnology R and D Center of LS Industrial Systems Cheongju 361-720 Korea Republic of Superconductivity and Applications Group Korea Electric Power Research Institute Daejeon 305-380 Korea Republic of School of Electrical Engineering and Computer Science Hanyang University Ansan 426-791 Korea Republic of

Resistive superconducting fault current limiters (SFCL's) are assumed to be a prospective solution for commercialization. But in spite of excellent current limiting performances realized by resistive SFCL's, commercialization and installation of SFCL's have been delayed due to difficulties in overcoming several technical problems such as a coordination with conventional relays. Resistive SFCL's may have difficulty in controlling an initiation of current limiting operation that sometimes is very important for coordination with relays, because the superconductor in the SFCL will quench immediately after the fault current reaches its critical current. In order to solve these problems, a novel hybrid SFCL of the first half cycle non-limiting type was developed. This paper presents the characteristics of this hybrid SFCL, its configuration and test results. © 2009 IEEE,.

关键词： Superconducting fault current limiters

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A New Robust Damping and Tracking controller for SPM Positioning Stages

A New Robust Damping and Tracking Controller for SPM Positio...

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2009 American control Conference (ACC 2009)

作者： Andrew J. Fleming Sumeet S. Aphale S. O. Reza Moheimani School of Electrical Engineering and Computer Science at the University of Newcastle Callaghan NSW Australia Center for Applied Dynamics Research (CADR) School of Engineering Kings College University of Aberdeen Aberdeen UK

ISBN: (纸本)9781424445233

This paper demonstrates a simple second-order controller that eliminates scan-induced oscillation and provides integral tracking action. The controller can be retrofitted to any scanning probe microscope with position sensors by implementing a simple digital controller or op-amp circuit. The controller is demonstrated to improve the tracking bandwidth of an NT-MDT scanning probe microscope from 15 Hz (with an integral controller) to 490 Hz while simultaneously improving gain-margin from 2 dB to 7 dB. The penalty on sensor induced positioning noise is minimal. For the Scanning Probe Microscope considered in this paper, the noise is marginally increased from 0.30 nm RMS to 0.39 nm RMS. Open- and closed-loop experimental images of a calibration standard are reported at speeds of 1 and 10 lines per second (with a scanner resonance frequency of 290 Hz). Compared to traditional integral or PID controllers, the proposed controller provides a bandwidth improvement of approximately ten times. This allows faster imaging and less tracking lag at low speeds.

关键词： Robust control Damping Scanning probe microscopy Bandwidth Digital control Operational amplifiers Circuit noise Calibration Resonance Resonant frequency

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The propagation modes of 2D photonic crystal waveguide used in coupling between conventional dielectric waveguides

The propagation modes of 2D photonic crystal waveguide used ...

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IEEE Youth Conference on Information, Computing and Telecommunication, YC-ICT

作者： Dan Zhang Atsushi Mase Hongting Jia Art Science and Technology Center for Cooperative Research Kyushu University Fukuoka Japan School of Electronic Engineering University of Electronic Science and Technology China Department of Computer Science and Electrical Engineering Kyushu University Japan

We studied the propagation modes of a two-dimensional photonic crystal waveguide and a problem of coupling between conventional dielectric waveguides, using the Fourier series expansion method combined with the absorbing boundary condition of a perfectly matched layer (PML). It is expected to explain the reason of the coupling efficiency between the photonic crystal waveguide and conventional dielectric waveguides.

关键词： Photonic crystals Dielectrics Electromagnetic waveguides Optical waveguides Fourier series Electromagnetic propagation Boundary conditions Optical refraction Tellurium Optical filters

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Performance evaluation of backoff algorithms in multi-hop wireless mesh networks

Performance evaluation of backoff algorithms in multi-hop wi...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Bong Chan Kim Heecheol Song Hwang Soo Lee Joong Soo Ma DMC Research and Development Center Samsung Electronics Company Limited Suwon South Korea School of Electrical Engineering and Computer Science KAIST Daejeon South Korea

ISBN: (纸本)9781424451227;9781424451234

Multi-hop wireless mesh networks (M-WMNs) have recently emerged as an alternative network infrastructure. For M-WMNs to serve as a network infrastructure, the protocol designs for M-WMNs should target a high network capacity. An efficient backoff algorithm is required to achieve a high network capacity. Most of existing works focused on backoff algorithms for infrastructure environment based on IEEE 802.11 distributed coordination function (DCF) or did not consider the features of M-WMN. In this paper, we propose an adaptive backoff algorithm based on the number of contention nodes for an IEEE 802.11 DCF-based M-WMN. The proposed backoff algorithm is founded on cross-layer cooperation between the routing and the medium access control (MAC) layers. The number of contention nodes of a node is obtained from the routing layer, and then this information is used to adaptively adjust the value of the minimum contention window (CW min ) in the backoff mechanism of the MAC protocol. To evaluate the performance of the proposed backoff algorithm and existing ones, computer simulations were performed. The simulation results show that the existing algorithms do not work well in M-WMN and the proposed backoff algorithm outperforms existing ones.

关键词： Spread spectrum communication Wireless mesh networks Media Access Protocol Access protocols Routing protocols research and development computer science Electronic mail Upper bound Guidelines

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Intelligent-adaptive flight control with a physiologically motivated algorithm

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International Journal of Modelling and Simulation 2009年第1期29卷 12-18页

作者： Mehrabian, A.R. Lucas, C. School of Mechanical Engineering Department of Engineering University of Tehran P.O. Box: 14875 - 347 Tehran Iran Center of Excellence for Control and Intelligent Processing School of Electrical and Computer Engineering Department of Engineering P.O. Box: 14395 - 515 Tehran Iran School of Cognitive Science IPM Tehran Iran

This paper presents a now intelligent approach for adaptive control of non-linear dynamic systems. Based on past researches on emotionally intelligent-control systems, the introduced method is a modified version of Brain Emotional Learning Based Intelligent controller (BELBIC), a physiologically motivated system previously developed and successfully used in control applications. The proposed approach is able to quickly respond to change in environmental and dynamic system and realizes online diroct-adaptivc-control scheme. Showing very good robustness, BELBIC is very simple in implementation and imposes very low computation load on the control system. This modified algorithm has boon successfully applied to real-time longitudinal control of an agile air-to-air missile which has over-changing non-linear dynamics.

关键词： Intelligent systems

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Improvement of Grayscale Image Segmentation Based on PSO Algorithm

Improvement of Grayscale Image Segmentation Based on PSO Alg...

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International Conference on computer sciences and Convergence Information Technology (ICCIT)

作者： Liping Zheng Quanke Pan Guangyao Li Jing Liang School of Computer Science Liaocheng University Liaocheng Shandong China CAD Research Center University of Tongji Shanghai China School of Electrical Engineering University of Zhengzhou Zhengzhou Henan China

Image segmentation is the base of image 3D reconstruction. It is a critical step in image processing. Threshold segmentation is a simple and important method in grayscale image segmentation. Maximum entropy method is a common threshold segmentation method. This method only utilizes gray information. In order to adequately utilize spatial information of greyscale image, an improved 2D entropy segmentation method is proposed. This new method is called PSO-SDAIVE algorithm. In this new method, the computation of 2D entropy is improved. Otherwise, particle swarm optimization (PSO) algorithm is used to solve maximum of improved entropy. Maximum takes as the optimal image segmentation threshold. In this paper, two head CT images are segmented in experiment. Compare with other segmentation method. Experimental results show that this new method can quickly and accurately obtain segmentation threshold. Otherwise, this method has strong anti-noise capability and saves computation time.

关键词： Gray-scale Image segmentation Entropy Histograms Pixel Image reconstruction Image processing Computed tomography Information technology computer science

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Histopathological Image Analysis: A Review

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IEEE Reviews in Biomedical engineering 2009年 2卷 147-171页

作者： Gurcan, Metin N. Boucheron, Laura E. Can, Ali Madabhushi, Anant Rajpoot, Nasir M. Yener, Bulent Department of Biomedical Informatics The Ohio State University Columbus OH 43210 United States Klipsch School of Electrical and Computer Engineering New Mexico State University Las Cruces NM 88003 United States Global Research Center General Electric Corporation Niskayuna NY 12309 United States Biomedical Engineering Department Rutgers University Piscataway NJ 08854 United States Department of Computer Science University of Warwick Coventry CV4 7AL United Kingdom Computer Science Department Rensselaer Polytechnic Institute Troy NY 12180 United States

Over the past decade, dramatic increases in computational power and improvement in image analysis algorithms have allowed the development of powerful computer-assisted analytical approaches to radiological data. With the recent advent of whole slide digital scanners, tissue histopathology slides can now be digitized and stored in digital image form. Consequently, digitized tissue histopathology has now become amenable to the application of computerized image analysis and machine learning techniques. Analogous to the role of computer-assisted diagnosis (CAD) algorithms in medical imaging to complement the opinion of a radiologist, CAD algorithms have begun to be developed for disease detection, diagnosis, and prognosis prediction to complement the opinion of the pathologist. In this paper, we review the recent state of the art CAD technology for digitized histopathology. This paper also briefly describes the development and application of novel image analysis technology for a few specific histopathology related problems being pursued in the United States and Europe. © 2009, The Institute of electrical and Electronics Engineers, Inc.

关键词： computer-aided diagnosis computer-assisted interpretation digital pathology histopathology image analysis microscopy analysis

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