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An ultrawideband (UWB) switched-antenna-array radar imaging system

An ultrawideband (UWB) switched-antenna-array radar imaging ...

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4th ieee International symposium on Phased Array Systems and technology, Array 2010

作者： Charvat, Gregory L. Kempel, Leo C. Rothwell, Edward. J. Coleman, Christopher M. Mokole, Eric L. Dept. of Electrical and Computer Engineering 2120 Engineering Building Michigan State University East Lansing MI 48824 United States Integrity Applications Incorporated 5180 Parkstone Drive Chantilly VA 20151 United States 4555 Overlook Avenue S.W. Washington DC 20375 United States

ISBN: (纸本)9781424451272

A low-cost ultrawideband (UWB), 1.926-4.069 GHz, phased array radar system is developed that requires only one exciter and digital receiver that is time-division-multiplexed (TDM) across 8 receive elements and 13 transmit elements, synthesizing a fully populated 2.24 m long (λ/2 element-to-element spacing) linear phased array. A 2.24 m linear phased array with a 3 GHz center frequency would require 44 antenna elements but this system requires only 21 elements and time to acquire bi-static pulses across a subset of element combinations. This radar system beamforms in the near field, where the target scene of interest is located 3-70 m down range. It utilizes digital beamforming, computed using the range migration synthetic aperture radar (SAR) algorithm. The phased array antenna is fed by transmit and receive fan-out switch matrices that are connected to a UWB LFM pulse compressed radar operating in stretch mode. The peak transmit power is 1 mW and the transmitted LFM pulses are long in time duration (2.5-10 ms), requiring the radar to transmit and receive simultaneously. It will be shown through simulation and measurement that the bi-static antenna pairs are nearly equivalent to 44 elements spaced λ/2 across a linear array. This result is due to the fact that the phase center position errors relative to a uniform λ/2 element spacing are negligible. This radar is capable of imaging free-space target scenes made up of objects as small as 15.24 cm tall rods and 3.2 cm tall metal nails at a 0.5 Hz rate. applications for this radar system include short-range near-real-time imaging of unknown targets through a lossy dielectric slab and radar cross section (RCS) measurements. © 2010 ieee.

关键词： Radar antennas

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Design and evaluation of an embedded system based SLAM applications

Design and evaluation of an embedded system based SLAM appli...

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ieee/SICE International symposium on System Integration

作者： Bastien Vincke Abdelhafid Elouardi Alain Lambert UMR CNRS 8622 University of Paris Sud-XI Orsay France

Simultaneous Localization And Mapping (SLAM) is a branch of algorithms widely used by autonomous robots operating in unknown environments. Research community has developed numerous SLAM algorithms in the last years. Several researches have presented optimizations into different approaches. However, they have not explored a system optimization from the algorithmic development level to the system hardware design. In some applications areas, such as indoor mapping, we would obviously benefit from low-cost sensors technology and SLAM implementations on a smart architecture. In this paper, a solution to the SLAM problem is presented. It is based on the co-design of a hardware architecture, a feature detector, a SLAM algorithm and an optimization methodology. Experiments were conducted with an instrumented vehicle. Results aim to demonstrate that our approach, based on low-cost sensors interfaced to an adequate architecture and an optimized algorithm, is good suitable to design embedded systems for SLAM applications in real time conditions.

关键词： Simultaneous localization and mapping Detectors Feature extraction Cameras Computer architecture

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Wireless Sensor Networks in Life Science applications

Wireless Sensor Networks in Life Science Applications

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3rd Annual International Conference on Human System Interaction (HSI)

作者： Gorski, Philipp Golatowski, Frank Behnke, Ralf Fabian, Christian Thurow, Kerstin Timmermann, Dirk Univ Rostock Fac CS & EE Inst Appl Microelect & Comp Engn Rostock Germany CELISCA Ctr Life Sci Automat Rostock Germany

ISBN: (纸本)9781424475629

Over the last years Wireless Sensor Networks (WSN) have been becoming increasingly applicable for real world scenarios and now production ready solutions are available. In the same period the upcoming combination of Service-oriented Architectures and Web Service technology demonstrated a way to realize open standardized, flexible, service component based, loosely coupled and interoperable cross domain Enterprise Software solutions. But those solutions have been too resource-intensive and complex to be applicable for limited devices like wireless sensor nodes or small-sized embedded systems. Thus, more and more research investigations have been launched to bring the aspect of cross domain interoperability to the field of embedded battery powered devices. Now it is time to show the potential of integrating Web Services enabled WSN solutions in Enterprise systems. The proposed laboratory assistance solution in this paper demonstrates the benefits of Web Service enabled WSNs for process monitoring and disaster management by extending an existing system in the Life Science Automation domain.

关键词： Devices Profile for Web Services Disaster Management Laboratory Information Management System Life Science Automation Sensor Web Enablement Sensor Observation Service Service-oriented Architecture Web Services

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Mobile agent based metadata framework for heterogeneous wireless sensor network

Mobile agent based metadata framework for heterogeneous wire...

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2010 International Conference on Educational and Information technology, ICEIT 2010

作者： Liu, Tang Fang, Feng-Cai Embedded Software and System Institute Beijing University of Technology Beijing China Guangxi Teachers Education University Guangxi China

ISBN: (纸本)9781424480340

Wireless sensor network are promising to be used in a wide range of applications, the need to effective save and retrieve the data will grow. Metadata, self-describing data about sensor nodes and sensing data, assist to the data exchange between different users and understand different capabilities provided by heterogeneous sensor networks. Metadata management in resource constrained sensor nodes is unfeasible. Meanwhile, the agent is suitable to the heterogeneous sensor network with its characteristics of self-organization, distributed and strong processing capability. So, to minimize the energy cost of sensor, prolong the lifetime of sensor network and meet the requirements of access to realtime data we propose a framework that store and collection metadata in mobile agent. The proposed approach can deal with complex metadata of heterogeneous sensor network and achieve better performance in communication costs and real time process. © 2010 ieee.

关键词： Mobile agents

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Influence of the packet size on the one-way delay on the down-link in 3G networks

Influence of the packet size on the one-way delay on the dow...

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ieee 5th International symposium on Wireless Pervasive Computing 2010, ISWPC 2010

作者： Arlos, Patrik Fiedler, Markus Blekinge Institute of Technology 37179 Karlskrona Sweden

ISBN: (纸本)9781424468584

The number of mobile broadband users is increasing. Furthermore, these users have high expectations into the capabilities of mobile broadband, comparable to those in fixed networks. On the other hand, the capacity assignment process on mobile access links is far from transparent to the user, and its properties need to be known in order to minimize the impact of the network on application performance. This paper investigates the impact of the packet size on the characteristics of the one-way delay for the down-link in third-generation mobile networks. For interactive and real-time applications such as VoIP, one-way delays are of major importance for user perception;however, they are challenging to measure due to their sensitivity to clock synchronization. Therefore, the paper applies a robust and innovative method to assure the quality of these measurements. We focus on the down-link as this is still the link that carries the most traffic to the user, and the quality of it will have a significant impact on all IP-based services. Results from measurements from several Swedish mobile operators reveal the possibility to partly control one-way delay and its variability by choosing appropriate packet sizes. In particular, packet sizes leading to the use of WCDMA entail significant but hardly varying one-way delays. On the other hand, we also show that HDSPA networks can deliver large amounts of data at rather high speed, but the cost is a huge variability in the one-way delay. ©2010 ieee.

关键词： Packet networks

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An intelligent network for federated testing of netcentric systems

An intelligent network for federated testing of netcentric s...

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2010 ieee International symposium on Policies for Distributed Systems and Networks, Policy 2010

作者： Chow, Edward James, Mark Chang, Hsin-Ping Vatan, Farrokh Sudhir, Gurusham NASA Jet Propulsion Laboratory California Institute of Technology Pasadena CA 91109 United States

ISBN: (纸本)9780769542386

We will describe a dynamic federated autonomic networking system 1 for the testing of netcentric systems across organizations. Using a suite of policy-based management software tools, our system can provide netcentric missions with self-configuring, self-debugging, self-healing, and self-protecting capabilities across end-to-end coalition networks. The novelty of our system originates from: (1) A multi-party dynamic policy negotiation algorithm and protocol for autonomous cross-organization negotiations on network resources;(2) A RDF/XML based language to enable automated understanding of network and application configurations across organizations;(3) A teachable, natural language policy capture system;(4) An advanced user interface tool for capturing and representing domain expert knowledge;and (5) A reasoning system for distributing and applying domain knowledge. This system has been developed for large-scale netcentric systems testing applications where the rapid configuration and management of dynamically changing netcentric test exercises is critical. Using a scenario from a real test exercise involving test ranges around the country, we have demonstrated in our testbed that we could reduce the debugging time for a network configuration problem from 6 hours, involving dozens of operators, to less than 2 seconds with minimal human involvement. © 2010 ieee.

关键词： Program debugging

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A programmable, cost-effective, real-time high frequency ultrasound imaging board based on high-speed FPGA

A programmable, cost-effective, real-time high frequency ult...

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作者： Qiu, Weibao Yu, Yanyan Sun, Lei Department of Health Technology and Informatics Hong Kong Polytechnic University Hong Kong

ISBN: (纸本)9781457703829

High frequency (20MHz) ultrasound imaging has made it possible to delineate small structures with fine spatial resolution. Previously, a high frequency high frame rate imaging system had been developed for small animal cardiac imaging [2, 5]. This paper presents further development of a programmable, low-cost, real-time high frequency ultrasound imaging board based on high-speed FPGA. Utilization of FPGA facilitates programmable applications with high flexibility. The printed circuit board (PCB) design achieves cost-effectiveness and compactness. The PCI bus interface allows high speed data transfer and real-time imaging. The dedicated front-end electronics showed a minimum detectable signal of 18V, allowing a 50dB dynamic range at a total gain of 50dB. The high-speed analog to digital converter (ADC) with a typical 10.8 bit ENOB was employed to accomplish high speed data acquisition. Algorithms such as band-pass filter, envelope detection and digital scan converter were implemented in the FPGA with high speed and high flexibility. Finally, wire phantom experiment showed good performance of such a programmable and compact design. © 2010 ieee.

关键词： Field programmable gate arrays (FPGA)

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Modeling UML sequence diagrams using extended Petri nets

Modeling UML sequence diagrams using extended Petri nets

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2010 International Conference in Information Science and applications, ICISA 2010

作者： Yang, Nianhua Yu, Huiqun Sun, Hua Qian, Zhilin Department of Computer Science and Engineering East China University of Science and Technology Shanghai 200237 China Shanghai Key Laboratory of Computer Software Evaluating and Testing Shanghai 201112 China

ISBN: (纸本)9781424459438

Unified modeling language (UML) sequence diagrams combined with the UML profile for modeling and analysis of real-time and embedded (MARTE) systems are used to represent the systems' requirements. To enhance formal analysis, sequence diagrams annotated with MARTE stereotypes are mapped into timed colored Petri nets with inhibitor arcs (TCPNIA). The mapping rules for the fragments of sequence diagrams and MARTE stereotypes are proposed respectively. The mapping rules for general ordering between messages are proposed to cope with complicated interactions. The data related issues are handled through colored properties in TCPNIA models, guard functions and operational functions. A mapping rule for state invariant is proposed based on data related information. Through state invariant, complicated control relations can be expressed. Formal definitions for morphing and substitution in TCPNIA models are given. They provide modular and hierarchical modeling methods for TCPINA models. A case study shows the applicability and feasibility of our method. ©2010 ieee.

关键词： Petri nets

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Flexible Resource Management for Self-X Systems: An Evaluation

Flexible Resource Management for Self-X Systems: An Evaluati...

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ieee International symposium on Object/Component/Service-Oriented real-time Distributed Computing Workshops (ISORCW)

作者： Simon Oberthür Leszek Zaremba Hermann Simon Lichte Heinz Nixdorf Institute University of Paderborn Paderborn Paderborn Germany Computer Networks Group University of Paderborn Paderborn Germany

In classical real-time systems the resources for an application are allocated at system start so that every resource request can be fulfilled in future. This would lead to much internal waste of resources in the case of modern Self-X systems, because these systems have highly dynamic resource consumptions. The Flexible Resource Manager (FRM) was developed to overcome this problem. The manager puts temporarily unused resources at other applications' disposal. In this paper the FRM approach is evaluated by concrete application examples and randomly generated applications.

关键词： Resource management real time systems Application software Mechatronics Protocols Concrete Hardware Distributed computing Conferences embedded system

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Accelerating mutual-information-based registration on multi-core systems

Accelerating mutual-information-based registration on multi-...

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2010 ieee International symposium on Parallel and Distributed Processing, Workshops and Phd Forum, IPDPSW 2010

作者： Shen, Jian Chen, Yurong Li, He Zhang, Yimin Xu, Yinlong Dept. of Computer Science Univ. of Science and Technology China Intel Labs China Intel Corporation United States

ISBN: (纸本)9781424465347

Mutual-Information-Based Registration (MIBR) is an image registration method that maps points from one image to another. It has been widely used in medical image processing applications. However, MIBR is a very compute-intensive task, and fast processing speed is often required in medical diagnosis. Nowadays, with the multi-core processor becoming the mainstream, MIBR can be accelerated by fully utilizing the computing power of available multi-core processors. In this paper, we propose a parallel MIBR algorithm and present some optimization techniques to improve the implementation's performance. The result shows our optimized implementation can register a pair of 512x512x30 3D images in one second on an 8- core system, which meets the real-time processing requirement. We also conduct a detailed scalability and memory performance analysis on the multi-core system. The analysis helps us to identify the causes of bottlenecks, and make suggestion for future improvement on large-scale multi-core systems. © 2010 ieee.

关键词： Computing power

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