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Off-the-shelf modal analysis: Structural health monitoring with Motes

Off-the-shelf modal analysis: Structural health monitoring w...

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24th Conference and Exposition on Structural Dynamics 2006, IMAC-XXIV

作者： Clayton, Erik H. Qian, Yuyin Orjih, Obi Dyke, Shirley J. Mita, Akira Lu, Chenyang Department of Civil Engineering Washington University in St. Louis Campus Box 1130 One Brookings Drive St. Louis MO 63130 United States Department of System Design Engineering Keio University 3-14-1 Hiyoshi Kohoku-ku Yokohama 223-8522 Japan Department of Computer Science and Engineering Washington University in St. Louis Campus Box 1045 One Brookings Drive St. Louis MO 63130 United States

ISBN: (纸本)0912053941

Breakthrough strides in micro-electro-mechanical systems (MEMS) demand a paradigm shift in traditional data acquisition and signal processing methodologies used for structural health monitoring (SHM). One such device which embodies MEMS technology is the Mote. Motes integrate a microprocessor, memory, and a radio transmitter together and can be outfitted with a plethora of industry standard sensory devices with little or no modification. The implication of this conglomerated setup is that it can be used to reduce, store, and ship data at the acquisition site. Moreover, the commercial development of these devices has reduced production costs and increased product development. As such, the intrinsic versatility of a Mote system can be affordably harnessed and dense sensor arrays can be utilized to enhance real-time modal parameter identification, the backbone of global vibration based SHM techniques. However there are limitations which need to be addressed. For example, significant data loss is attributed to the low bandwidth of the low power radio transmitter employed on Mica2 Motes. This issue of contention has been addressed by recent technological improvements in wireless transmission standards. Yet in spite of the progress made by new transmission protocols and standards towards reducing radio power consumption, increasing bandwidth, and reducing transmission latency, they alone will not meet all of the needs of a full-scale wireless SHM system. In light of this realization the efforts of this paper are shifted from previous studies where time histories were streamed from the data acquisition site to a central location for processing. Now instead the focus is on decentralizing the SHM system by exploiting the on-board computational faculties of a Mote. Here a simple signal processing and spectrum curve-fitting technique is used to automatically extract dominant frequency components of an acceleration time history record. Identified frequencies are then implemente

关键词： Structural health monitoring

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COS: A Configurable OS for Embedded SoC systems

COS: A Configurable OS for Embedded SoC Systems

引用

IEEE International Conference on Embedded and Real-Time Computing systems and Applications (RTCSA)

作者： Hsin-hung Lin Chih-Wen Hsueh Real-Time Systems Laboratory Department of Computer Science and Information Engineering National Chung Cheng University Chiayi Taiwan Embedded System and Wireless Networking Laboratory Graduate Institute of Networking and Multimedia and Department of Computer Science and Information Engineering National Taiwan University Taipei Taiwan

As the increasing of system performance and computing power, embedded systems are more complicated and interactive. Therefore, operating system (OS) plays a more important role in embedded systems to utilize various hardware and software resources. However, no OS can meet all requirements of various embedded systems. Due to the advance of reconfigurable processors, system requirements can be more dynamic. Embedded OS has becoming more critical in the development of embedded systems and thus there is a strong need of configurable embedded OS to better and faster build up the target system. In this paper, we propose a configurable OS, called COS, based on SOA (service-oriented architecture) for embedded SoC (system on a chip) systems to build an application specific OS according to the system requirements. COS can be easily configured to better utilize the resources of the target embedded platform and have better support to the embedded application. Moreover, the COS can easily extend new features or functionalities of other OSes and even be adapted to the designs of other OSes. We implement COS on an ARM platform to prove its configurability and also evaluate its overhead. We believe that COS can be configured to meet the various requirements in embedded SoC systems and help to speed up the embedded system development process

关键词： Embedded system Kernel system-on-a-chip Service oriented architecture Operating systems Real time systems Laboratories computer science Power engineering and energy system performance

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High SNR flexible top hat monopole probe for 1.5 T MRI

High SNR flexible top hat monopole probe for 1.5 T MRI

引用

作者： Mohammadzadeh, M. Shahabadi, M. Soltanian-Zadeh, H. Tavakoli, A. Rafiei, B. Javidnia, D. Oghabian, M.A. Department of Physics Amir-Kabir University of Technology Tehran Iran School of Electrical and Computer Engineering University of Tehran Tehran Iran Control and Intelligent Processing Center of Excellence School of Electrical and Computer Engineering University of Tehran Tehran Iran Image Analysis Laboratory Department of Radiology Henry Ford Health System Detroit MI United States Department of Electrical Engineering Amir-Kabir University of Technology Tehran Iran Medical Imaging Center Imam Khomeyni Hospital Tehran Iran Research Center for Science and Technology in Medicine Tehran University of Medical Sciences Tehran Iran

In this paper, design principles and application of a thin and flexible intravascular top hat monopole probe with increased signal-to-noise ratio (SNR) and improved longitudinal and radial coverage are described and compared with the conventional monopole probe. The top hat probe is constructed by removing a segment of the shield of a coaxial cable. A flexible thin copper foil in contact with the inner conductor of the cable is added to the end section of the cable. The copper foil acts as an antenna top hat load increasing the uniformity of the current distribution on the probe and establishes a uniform region of SNR distribution around the probe. Improvement of the SNR distribution of the top hat probe relative to the conventional monopole probe is evaluated using quantitative indices. Experimental results show that for the top hat probe, the ratio of the maximum image SNR to its relative standard deviation (SR) is 2.73 times higher than that of a conventional probe. © 2006 IOP Publishing Ltd.

关键词： Medical imaging

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Bayesian Interpretation of Adaptive Fuzzy Neural Network Model

Bayesian Interpretation of Adaptive Fuzzy Neural Network Mod...

引用

IEEE International Conference on Fuzzy systems (FUZZ-IEEE)

作者： Sang Wan Lee Dae-Jin Kim Yong Soo Kim Zeungnam Bien Electrical Engineering and Computer Science Department Korean Advanced Institute of Science and Technology Daejeon South Korea Human-friendly Welfare Robot System Engineering Research Center Korean Advanced Institute of Science and Technology Daejeon South Korea Division of Computer Engineering Daejeon University Daejeon South Korea

This paper conveys Bayesian interpretation of improved integrated adaptive fuzzy clustering(IAFC), which is one of the adaptive fuzzy neural network models and suggests upper bound of vigilance parameter, which gives us a guideline to endow IAFC with flexibility within the framework of minimum risk classifier. Besides, we proposed the off-line and on-line learning strategy of IAFC. The proposed techniques are applied to construct facial expression recognition system dealing with neutral, happy, sad, and angry. We empirically show that proposed methods are able to outperform the conventional IAFC.

关键词： Bayesian methods Adaptive systems Fuzzy neural networks Clustering algorithms Intelligent robots Decision theory Guidelines Face recognition Partitioning algorithms Service robots

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A Unified Ontology-Based Process Model for Software Maintenance and Comprehension 06

A Unified Ontology-Based Process Model for Software Maintena...

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Workshop and Symposia at MoDELS 2006

作者： Juergen Rilling Yonggang Zhang Wen Jun Meng René Witte Volker Haarslev Philippe Charland Department of Computer Science and Software Engineering Concordia University Montreal Canada System of Systems Section Defence R&D Canada Valcartier Canada

ISBN: (纸本)9783540694885

In this paper, we present a formal process model to support the comprehension and maintenance of software systems. The model provides a formal ontological representation that supports the use of reasoning services across different knowledge resources. In the presented approach, we employ our Description Logic knowledge base to support the maintenance process management, as well as detailed analyses among resources, e.g., the traceability between various software artifacts. The resulting unified process model provides users with active guidance in selecting and utilizing these resources that are context-sensitive to a particular comprehension task. We illustrate both, the technical foundation based on our existing SOUND environment, as well as the general objectives and goals of our process model.

关键词： Software maintenance process modeling ontological reasoning software comprehension traceability text mining

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Reduction of RLC Tree Delay Using Bidirectional Buffer Repeater Insertion

Reduction of RLC Tree Delay Using Bidirectional Buffer Repea...

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International Conference on Innovative Computing, Information and Control (ICICIC)

作者： Trong-Yen Lee Yang-Hsin Fan Chia-Chun Tsai Department of Electronic Engineering and Institute of Computer and Communication National Taipei University of Technology Taipei Taiwan Information System Section of Library National Taitung University Taitung Taiwan Department of Computer Science and Information Engineering Nanhua University Chiayi Taiwan

In this paper, we propose a bidirectional buffer repeater insertion to reduce the RLC tree delay in multi-source multi-sink systems which involve four significant factors in our works. First, inductance effect is taken into account due to the reason that chip sizes with the exponential reduction and high work frequency. Second, bidirectional buffer repeater could improve interconnect delay more than unidirectional buffer insertion. Third, the location of insertion buffer is also considered in our work. Fourth, more than one buffer could be inserted in critical path while buffers have already existed. Finally, we develop a graphical user interface for designers to estimate the delay with bidirectional buffer repeater insertion target multi-source multi-sink systems. Experiment results shown that the reduced delay rate is 50.73% and 64.47% in 0.18 and 0.35 micron fabrication process, respectively

关键词： Repeaters Delay estimation Delay effects Inductance Propagation delay Fabrication Very large scale integration Integrated circuit interconnections Frequency Control systems

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Bridging the Real World with the RFID Phone - Focus on Development of Innovative Man Machine Interface and Abundant Wireless Internet Service-

Bridging the Real World with the RFID Phone - Focus on Devel...

引用

International Conference on computer and Information Technology (CIT)

作者： Young-jun Seo Deuk Kyoung Oum Peom Park Department of Material Science & Engineering Seoul National University of Technology Seoul South Korea Department of Computer Science University of Wisconsin Madison Madison WI USA Department of Industrial & Information System Engineering & Humintec Ajou University Suwon South Korea

The role of mobile phones in contemporary life is a means to access to the wireless internet service not to mention a device for general communication. Even if additional functions and services are provided for use, the complexity of the phone increases and the usability and learn-ability of the phone would decrease. This paper proposes an innovative man machine interface by implementing the RFID technology into mobile phones. Unlike current MMI, the RFID phone minimizes the key inputs to connect to the wireless internet service that users want to connect to. By using the RFID phone, the wireless internet service usage will be increased with various services provided.

关键词： Radiofrequency identification Man machine systems Web and internet services Mobile handsets Usability Wireless networks Materials science and technology Mobile communication Multiaccess communication Communication standards

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A control-design-based solution to robotic ecology: Autonomy of achieving cooperative behavior from a high-level astronaut command

A control-design-based solution to robotic ecology: Autonomy...

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作者： Wang, Jing Qu, Zhihua Ihlefeld, Curtis M. Hull, Richard A. Department of Electrical and Computer Engineering University of Central Florida Orlando FL 32816 United States Kennedy Space Center FL 32899 United States Lockheed Martin Missiles and Fire Control 5600 Sand Lake Rd. MP-450 Orlando FL 32819 United States School of Electrical and Computer Science University of Central Florida IEEE AIAA University of Central Florida Department of Electrical and Computer Engineering National Aeronautics and Space Administration Kennedy Space CenterKennedy Space Center Applied Physics Lab. Advanced Concepts Business Unit Science Applications International Corporation SAIC IEEE Control System Society

In this paper, we propose a cooperative control strategy for a group of robotic vehicles to achieve the specified task issued from a high-level astronaut command. The problem is mathematically formulated as designing the cooperative control for a general class of multiple-input-multiple-output (MIMO) dynamical systems in canonical form with arbitrary but finite relative degrees such that the outputs of the overall system converge to the explicitly given steady state. The proposed cooperative control for individual vehicle only need to use the sensed and communicated outputs information from its local neighboring vehicles. No fixed leader and time-invariant communication networks are assumed among vehicles. Particularly, a set of less-restrictive conditions on the connectivity of the sensor/communication networks are established, under which it is rigorously proven by using the newly found nice properties of the convergence of sequences of row stochastic matrices that the cooperative objective of the overall system can be achieved. Simulation results for a group of vehicles achieving a target and surrounding a specified object in formation are provided to support the proposed approach in this paper.

关键词： Robotics

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Design and evaluation of a PLL-based position controller for sensorless vector control of permanent-magnet synchronous machines

Design and evaluation of a PLL-based position controller for...

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IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics

作者： Burgos, Rolando P. Kshirsagar, Parag Lidozzi, Alessandro Jang, Jihoon Wang, Fred Boroyevich, Dushan Rodriguez, Pedro Sul, Seung-Ki Virginia Tech Blacksburg VA 24061 United States ROMA TRE University Department of Mechanical and Industrial Engineering Via della Vasca Navale 79 00146 Rome Italy HEV System Engineering Team Hyundai Motor Company Hwaseong-Si Gyeonggi-Do 772-1 Korea Republic of Department of Electrical Engineering Technical University of Catalonia EUETIT Colom 1 08222 - Barcelona Spain School of Electrical Engineering and Computer Science Seoul National University Seoul 151-744 Korea Republic of

ISBN: (纸本)1424401364

This paper presents a rotor position controller for sensorless vector control of permanent magnet synchronous machines (PMSM) based on a synchronous d-q frame phase-locked loop (PLL). Extending the capabilities of PLL's for grid-connected converters-using feedback linearization to ensure a constant dynamic response regardless of the operating region and rotor speed, the proposed controller takes advantage of the sinusoidal and balanced PMSM back-EMF voltages synchronizing the estimated and actual d-q frames. The resultant controller structure is readily linearized providing an accurate design tool based on frequency response specifications. A complete design procedure is provided, together with simulation and experimental results with a 3.5 kW PMSM drive, all of which verify the excellent results attained by the proposed PLL-based position controller. © 2006 IEEE.

关键词： Controllers

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Importance of Developing Image Restoration Techniques for Security Cameras under Severe Conditions

Importance of Developing Image Restoration Techniques for Se...

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SICE Annual Conference

作者： Yusaku Fujii Tadashi Ito Naoya Ohta Saburou Saitoh Tsutomu Matsuura Takao Yamamoto Department of Electronic Engineering Faculty of Engineering Gunma University Japan Department of Computer Science Faculty of Engineering Gunma University Japan Department of Mathematics Faculty of Engineering Gunma University Japan Department of Mechanical System Engineering Faculty of Engineering Gunma University Japan Department of Physics Faculty of Engineering Gunma University Japan

A concept, which was proposed and has been pursued by the authors for restoring the images of a suspected person taken by a security camera, is reviewed. In the concept, the peculiar facts concerning the security camera system that all the things in the image except the suspected person itself are usually preserved and that can be used for investigations are to be used as fully as possible. The authors have launched a project in which techniques based on the concept are developed for the police. In the project, some methods of restoring an image of a person's figure taken by a camera with dirty lens have been developed. The importance of pursuing the proposed concept is discussed from the viewpoints of not only the novelty in image processing technology but also the viewpoints of the efficiency in criminal investigation and social security

关键词： Image restoration Cameras Information security computer security Lenses Image processing Lighting Pixel computer science Mathematics

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