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检索条件"任意字段=12th International Conference on Embedded and Real-Time Computing Systems and Applications"

共 3164 条记录，以下是3001-3010 订阅

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An embedded real-time vision system for 24-hour indoor/outdoor car-counting applications

An embedded real-time vision system for 24-hour indoor/outdo...

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international conference on Pattern Recognition

作者： Ming-Yee Chiu R. Depommier T. Spindler Setrix Inc. Princeton NJ USA Setrix AG Munich Germany

We describe an embedded vision system, which integrates a Web-cam quality CMOS imaging chip with a RISC processor, to perform real-time car-counting functions in the indoor and outdoor environment. the challenge of this application, especially for the outdoor environment, is to develop vision algorithms for day and night, and during the light-transition periods (i.e., dawn and dusk). the vision system also needs to accommodate a tremendous range of illumination change (from sunny summer to snowy winter). Finally, we report briefly the result of an outdoor system we deployed in Germany since June 2003. the entire system consists of a network of 13 embedded vision systems covering a parking facility over 1 square kilometer. the vision-network has been in daily use for the employee parking guidance.

关键词： real time systems Machine vision Cameras Bicycles Motorcycles Computer architecture Object detection CMOS process Reduced instruction set computing Lighting

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Automatic SQNR determination in non-linear and non-recursive fixed-point systems

Automatic SQNR determination in non-linear and non-recursive...

引用

European Signal Processing conference (EUSIPCO)

作者： D. Menard R. Rocher P. Scalart O. Sentieys IRISA/ENSSAT University of Rennes I Lannion FRANCE

Most of the digital signal processing applications are implemented in embedded systems which are based on fixed-point arithmetic. the reduction of the time-to-market requires the automation of the fixed-point specification determination. the accuracy evaluation is one of the most important stage of this process. In this paper, a new methodology for evaluating the quality of non-recursive and non-linear systems is presented. the fixed-point specification accuracy is automatically determined through the computation of the Signal-to-Quantization-Noise-Ratio (SQNR) expression. the theoretical approach used for computing the output noise power is detailed and the methodology developed for automating the accuracy evaluation is presented. then, the quality of our estimation is evaluated through different experiments.

关键词： Abstracts Computational modeling

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An energy-efficient route maintenance scheme for ad hoc networking systems

An energy-efficient route maintenance scheme for ad hoc netw...

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9th international conference on real-time and embedded computing systems and applications, RTCSA 2003

作者： Ou, DongXiu Lam, Kam-Yiu Dong, DeCun Department of Computer Science City University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong Institute of Traffic Information Engineering Tong Ji University Shanghai China

ISBN: (纸本)9783540246862

Although in recent years many excellent works have been done on resolving the routing problem in ad hoc networking systems, the energy issue in route maintenance has been greatly ignored. Due to movement of mobile hosts, the energy consumption rate of a route may change with time. In this paper, we propose the distance-based route maintenance (DBRM) scheme in which a handoff mechanism is designed for switching the nodes in route maintenance to minimize the energy consumption rate. In addition, in DBRM, mobile hosts in a group may switch between different states of operations to conserve energy. In the simulation experiments, we have shown that the amount of energy conserved from using DBRM is significantly larger than both the IEEE standard 802.11 with fixed listen interval, and the power management scheme using GAF with random listen interval. © Springer-Verlag Berlin Heidelberg 2004.

关键词： IEEE Standards

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Secure multicast model for ad-hoc military networks

Secure multicast model for ad-hoc military networks

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IEEE international conference on Networks

作者： M. Choudhary P. Sharma D. Sanghi Department of Computer Science and Engineering Indian Institute of Technology Kanpur India

Multicasting is an efficient way to deliver real time data to a large group of users in the battle field military applications. the very nature of military applications necessitates the use of security features such as data confidentiality, source/group authentication etc., which are not readily offered by multicast. Further, the mobile ad hoc network (MANET) characteristics of the close collaborative military systems induce additional unpredictability into the design of an effective protocol for secure multicast. the energy expenditure in such an environment also poses a supplementary performance bottleneck in achieving scalability of mechanisms employed. this work tries to capture all such secure ad-hoc multicast features and attempts to integrate them with multilevel security. Multilevel security is the ability to distinguish subjects according to classification levels, which determines the degree to which they can access confidential objects. In the case of groups, this means that some members can exchange messages at a higher sensitivity level than others. Our work, also intends to highlight how the two issues of routing and security can be subtly merged into one not affecting each others performance, rather complementing each other to make the protocol more efficient in terms of computation.

关键词： Routing protocols Multilevel systems Mobile ad hoc networks Multicast protocols Cryptography Security Military computing Authentication Access protocols Computer science

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Motion capture from inertial sensing for untethered humanoid teleoperation

Motion capture from inertial sensing for untethered humanoid...

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IEEE-RAS international conference on Humanoid Robots

作者： N. Miller O.C. Jenkins M. Kallmann M.J. Mataric Department of Computer Science California State University Bakersfield CA USA Center of Robotics Embedded Systems Interaction Laboratory Los Angeles CA USA

We describe the design of a modular system for untethered real-time kinematic motion capture using sensors with inertial measuring units (IMU). Our system is comprised of a set of small and lightweight sensors. Each sensor provides its own global orientation (3 degrees of freedom) and is physically and computationally independent, requiring only external communication. Orientation information from sensors is communicated via wireless to host computer for processing. We present results of the real-time usage of our untethered motion capture system for teleoperating the NASA Robonaut. We also discuss potential applications for untethered motion capture with respect to humanoid robotics.

关键词： real time systems Sensor systems Kinematics Sensor phenomena and characterization Measurement units Motion measurement Physics computing Wireless sensor networks Wireless communication NASA

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Design and implementation of a dynamic protocol framework

Design and implementation of a dynamic protocol framework

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IEEE international conference on Networks

作者： LiMing An Hung-ICeng Pung LiFeng Zhou Network Systems and Services Lab School of Computing National University of Singapore Singapore

ISBN: (纸本)078038783X

Future distributed applications are expected to be deployed in an environment that is more dynamic and heterogeneous than ever before. the environment features are difficult to predict beforehand due to their variations. To cope with such variations, it is important that the protocol stack is adaptable to changing requirements. this paper proposes a component-based dynamical protocol framework (DPF) for multimedia applications. DPF dynamically builds an adaptive protocol stack by automatic discovery of protocol components and runtime configuration/reconfiguration of the protocol stack. Performance measurement shows that compared with directly using interfaces provided by JMF, using DPF to set up a dynamic protocol stack incurs slight overhead in unicast, and the similar condition is observed in multicast. this is the trade-off for the abilities to configure/reconfigure protocol stack during stream set-up and run time.

关键词： Application software Streaming media Multicast protocols Middleware Fluctuations Data communication Runtime environment Computer networks Distributed computing Drives

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An efficient hidden Markov model training scheme for anomaly intrusion detection of server applications based on system calls

An efficient hidden Markov model training scheme for anomaly...

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IEEE international conference on Networks

作者： X.A. Hoang J. Hu School of Computer Science and Information Technology RMIT University Melbourne VIC Australia

Recently hidden Markov model (HMM) has been proved to be a good tool to model normal behaviours of privileged processes for anomaly intrusion detection based on system calls. However, one major problem with this approach is that it demands excessive computing resources in the HMM training process, which makes it inefficient for practical intrusion detection systems. In this paper a simple and efficient HMM training scheme is proposed by the innovative integration of multiple-observations training and incremental HMM training. the proposed scheme first divides the long observation sequence into multiple subsets of sequences. Next each subset of data is used to infer one sub-model, and then this sub-model is incrementally merged into the final HMM model. Our experimental results show that our HMM training scheme can reduce the training time by about 60% compared to that of the conventional batch training. the results also show that our HMM-based detection model is able to detect all denial-of-service attacks embedded in testing traces.

关键词： Hidden Markov models Intrusion detection Databases Application software Data processing Data mining Frequency Computer science Information technology Australia

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On computing maximum likelihood phylogeny using FPGA 14th

On computing maximum likelihood phylogeny using FPGA

引用

14th international conference on Field Programmable Logic and applications, FPL 2004

作者： Mak, Terrence S. T. Lam, K.P. Department of Systems Engineering and Engineering Management The Chinese University of Hong Kong Hong Kong

ISBN: (纸本)3540229892

Phylogenetic tree (or phylogeny) is a meaningful tree representation for the evolutionary history of different organisms that it has been shown useful in drug discovery, virus identification and functional genomic study [1]. the objective of this project is to develop efficient FPGA implementations for phylogenetic tree reconstruction algorithms. By taking advantage of hardware high-performance, we explore the possibilities of parallelization and system optimization to provide high-speed acceleration for the phylogeny inference. the Maximum Likelihood approach for inferring the phylogeny from molecular data has received much attention [2]. Although the optimal ML phylogenetic tree search problem is classified as NP-hard and it is difficult to find the optimal solution, the GAML algorithm (based on Genetic Algorithm and Maximum Likelihood) has been shown to find a good near-optimal solution in reasonable time [3]. In [4], we have shown that using HW/SW (Hardware/ Software) codesign for GAML implementation can provide significant speed-up when compared with software-only implementation. Our HW/SW system has good potential for handling large scale problems in real applications. In [5], an enhanced version of FPGA design with parallel and pipelined implementation for the likelihood evaluation is proposed. It has been shown 100 times faster than the single-CPU solution for the ML tree evaluation. To reduce precision loss attributed to truncation error in the FPGA, we are developing a dynamic floating-point alike structure based on the fixed-point architecture. We have also studied the implementation of phylogenetic tree reconstruction algorithm in the embedded platform (i.e. VirtexII-Pro Platform FPGA). Significant improvement in data transmission rate between hardware and software and higher clock frequency of FPGA have been realized [6]. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Field programmable gate arrays (FPGA)

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Reliability of MEMS-based storage enclosures

Reliability of MEMS-based storage enclosures

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international Symposium on Modeling, Analysis and Simulation of Computer and Telecommunication systems (MASCOTS)

作者： Bo Hong T.J.E. Schwarz S.A. Brandtt D.D.E. Long Storage Systems Research Center University of California Santa Cruz CA USA Computer Engineering Department Santa Clara University Santa Clara CA

MEMS-based storage is a new, non-volatile storage technology currently under development. It promises fast data access, high throughput, high storage density, small physical size, low power consumption, and low entry costs. these properties make MEMS-based storage into a serious alternative to disk drives, in particular for mobile applications. the first generation of MEMS will only offer a fraction of the storage capacity of disks; therefore, we propose to integrate multiple MEMS devices into a MEMS storage enclosure, organizing them as a RAID Level 5 with multiple spares, to be used as the basic storage building block. the paper investigates the reliability of such an enclosure. We find that mean-time-to-failure is an inappropriate reliability metric for MEMS enclosures. We show that the reliability of the enclosures is appropriate for their economic lifetime if users choose not to replace failed MEMS storage components. In addition, we investigate the benefits of occasional, preventive maintenance of enclosures.

关键词： Micromechanical devices Microelectromechanical devices Costs Energy consumption Power generation economics Hard disks embedded computing Power system reliability Maintenance Telecommunication computing

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Improving real-time system configuration via a QoS-aware CORBA component model

Improving real-time system configuration via a QoS-aware COR...

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Annual Hawaii international conference on System Sciences (HICSS)

作者： Nanbor Wang C. Gill Department of Computer Science and Engineering Washington University Saint Louis MO USA

A fundamental tension exists in systems research and practice between (1) hiding extraneous details to simplify the system programming model, and (2) revealing crucial details to allow better customization to particular application requirements, data characteristics, or other constraints. For many modern systems, such as distributed real-time and embedded (DRE) systems and multimedia applications, this tension is even stronger: the correctness of the system depends not only on functional behavior (e.g., correctness of interfaces and the algorithms behind them) but also on quality of service (QoS) properties such as CPU speeds, frame rates, and end-to-end timeliness requirements. Satisfying both the functional and QoS requirements of modern applications running in various run-time environments requires programming models that can allow selective visibility and reconfigurability of key details in both the application and the services it uses. Although prior research and practice has focused on decoupling system properties from the application logic to facilitate modification at different points in the system life-cycle, some system properties cross-cut both (1) multiple layers (application and supporting infrastructure) and (2) multiple configuration phases in the system lifecycle. To date, there has been little support for configuring such cross-cutting concerns in a systematic and standardized way across different kinds of applications. this has resulted historically in laborious and ad hoc hand-customization of systems to meet real-world constraints, especially for DRE systems. However, the convergence of model-integrated computing with component-oriented middleware in the DRE middleware research community offers a new opportunity for automated coordination of system modifications at different layers and at different points in the system lifecycle, to meet application requirements end-to-end. We are extending the component-integrated ACE ORB (CIAO), to provide a un

关键词： real time systems Quality of service Middleware Multimedia systems Runtime environment Functional programming Reconfigurable logic Logic programming Convergence Aerospace electronics

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