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PHD filter multi-target tracking in 3D sonar

PHD filter multi-target tracking in 3D sonar

引用

OCEANS - Europe

作者： D.E. Clark J. Bell Y. de Saint-Pern Y. Petillot Ocean Systems Lab Electrical and Computer Engineering Heriot-Watt University Edinburgh UK Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System Xi'an Jiaotong University Xi'an PR China Shenji Kunming Machine Tool Company Limited

The Probability Hypothesis Density (PHD) Filter was developed as a method for tracking a time varying number of targets without data association. The first order statistical moment of the multiple target posterior distribution called the Probability Hypothesis Density which is represented by discrete samples or particles gives the expected locations of the targets. This property is used instead of the full multi-target posterior distribution as it is rcquires significantly less computation and particle tilter implementations have demonstrated lhe potential of the algorithm to be used for real-time tracking applications. In this article, an application of the Particle PHD Filler is demonstrated to track a variable number of objects in threedimensiond sonar images estimating both the number of targets and their locations. The number of targets is estimated at each iteration by computing the mass of lhe particle weights. The locations of the targets are determined by extracting peaks of the PHD which is a distinct task from the computation of the particles. Previous approaches have used the Expectation Maximisation (EM) algorithm to fit a Gaussian mixture model whose time complexity is quadratic in the number of targets which is not ideal for a real-time tracking appiication and so alternative clustering techniques are considered here. A comparison is made between the methods for the accuracy of estimation, robustness and the time taken.

关键词： Filters Target tracking Sonar navigation Probability Particle tracking Underwater tracking Robustness Underwater vehicles Acoustic sensors Distributed computing

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Access Network Service Delivery using nested workflow process

Access Network Service Delivery using nested workflow proces...

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9th IEEE/IFIP Network Operations and Management Symposium (NOMS 2004)

作者： Kim, H Chung, B Choi, H Kim, S Oper. Support System Laboratory KT South Korea Department of Computer Engineering CNU South Korea

ISBN: (纸本)0780382307

The current issue for the Access Network Service Delivery is to swiftly accommodate newly-generated service product by way of minimizing the influence caused by the change of the legacy system. Korea experienced the rapidily changing Access Network Facility. In order to follow up rapidly changing environment, Network Service Provider(NSP)s have to develop the flexible and cost effective Operations Support system(OSS)s. The service delivery management based on the conventional concepts is difficult to support the proper service delivery of the newly compound and cross-domain Internet services. Because of the severe competition among the service providers, the dence house pattern near the wire center, the governmental support, and the huge demands for internet usage among the younger generation, the importance of the Access Network Service Delivery grows larger. We propose nested workflow process for the cross domain Internet Service with PM(Provisioning Model). Dividing into several sub work process and simplified Master Workflow for cross domain service delivery can manage the large scale and complex work into simple work and flow. Access Network Service delivery can be divided into several main jobs. Service order classification, Outside Plant Management, Inside Plant Management, Activation, Facility Service Confirmation and Send result to Billing system. Nested Hierarchical Structure can balance the complexity and simplification. The OSS for access network service can manage the service installation at low cost and deliver the Internet services efficiently by choose and use appropriate provisioning models for each network models for the Internet service environments. If the automation of the service provisioning and the access equipment activation is possible based on the proposed idea, it completes the service requests for the Internet service installation across the domains in short time. And NSPs can satisfy their customers. Moreover, NSPs can save lots of expe

关键词： workflow activation provisioning network OSS SDM ADSL

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Towards new real-time processor: The multioperand MSB-first real-time adder

Towards new real-time processor: The multioperand MSB-first ...

引用

Proceedings of the EUROMICRO systems on Digital system Design, DSD 2004

作者： Kuspriyanto Kerlooza, Yusrila Y. Lab. of Computer and Control System Dept. of Electrical Engineering Bandung Institute of Technology Hardware Laboratory Dept. of Computer Engineering Indonesian Computer University

ISBN: (纸本)0769522033

Arithmetic operation's execution time in real-time system is bounded by deadlines. The method commonly used to meet these deadlines is by employing any suitable process-scheduling algorithm, which may contain a potential weakness. If time needed to operate is longer than its deadline, then the result's quality will be poor. This is mainly caused by the algorithms of the arithmetic operations commonly used nowadays do not choose the most significant data to be processed first. This research tries to design new algorithm and its processing unit that works based on real-time principles, which starts its computation process from the highest valued digit and provides its intermediate-results that can be accessed anytime during the process. Designing tool used in this research is MAX+plus II Baseline 10.2 software. This research accomplishes in showing the performance of the new algorithm and its processing unit, which is better than the performance of the conventional algorithm.

关键词： Real time systems

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A two-level schema for detecting recognition errors 8

A two-level schema for detecting recognition errors

引用

8th International Conference on Spoken Language Processing, ICSLP 2004

作者： Zhou, Zheng-Yu Meng, Helen Human-Computer Communications Laboratory Department of System Engineering and Engineering Management Chinese University of Hong Kong Hong Kong Hong Kong

This paper proposes a two-level schema for the automatic detection of possible errors in speech recognition hypotheses. Given the recognition hypothesis of an utterance, the first level in our schema applies an utterance classifier (UC) to decide if the hypothesis is error-free or erroneous. In the latter case, the utterance is passed on to the second level in our schema for further processing. A word classifier (WC) is applied to each of the word hypotheses in the utterance to decide whether or not it is a misrecognition. Hence the two-level schema can locate error-containing regions in the recognition hypotheses. These are the target regions to which we can apply more sophisticated and expensive language models for error correction as a next step. We have developed UC and WC based on Support Vector Machines (SVM). Experiments on Mandarin Chinese speech recognition using the Speech-Lab-In-A-Box corpora showed that the UC has a detection error rate of 16.5% for misrecognized utterances;the WC has a detection error rate of 19.8% for erroneous word hypotheses;and the overall two-level schema can catch 44.5% of the erroneous word hypotheses.

关键词： Speech recognition

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Error identification for large vocabulary speech recognition

Error identification for large vocabulary speech recognition

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2004 International Symposium on Chinese Spoken Language Processing

作者： Zhou, Zheng-Yu Meng, Helen Human-Computer Communications Laboratory Department of System Engineering and Engineering Management Chinese University of Hong Kong Hong Kong Hong Kong

ISBN: (纸本)0780386787

This paper proposes two methods for identifying recognition error. The first method is a two-level schema [1]- given the recognition hypothesis of an utterance, an utterance classifier (UC) is first applied to decide if the hypothesis is error-free or erroneous;followed by a word classifier (WC) which is applied to each word hypothesis in the erroneous utterance to decide if the word hypothesis is a misrecognition. The second method is a one-level schema in which a word classifier is applied directly to all word hypotheses to detect word recognition errors. We compare the two methods at both word and utterance levels. Experimental results show that the two methods are comparable in terms of word error detection. However, the two-level schema is very effective in filtering out error-free utterance hypotheses, which offers a key advantage to economize on word error detection. ©2004 IEEE.

关键词： Speech recognition

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Remote spectral imaging with multi-wavelength and tunable, wavelength-modulation lasers

Remote spectral imaging with multi-wavelength and tunable, w...

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Conference on Lasers and Electro-Optics, CLEO

作者： Wang, Yi Peng, Chuan Zhang, HuanLin Le, H.Q. Photonic Device and System Laboratory Department of Electrical and Computer Engineering University of Houston 4800 Calhoun TX 77204-4005 United States

Scanning laser remote imaging with wavelength-division-multiplexed and/or wavelength-agile transmitters allows acquisition of different target spectral signatures. Wavelength-modulation-spectroscopic imaging of a gas ... 详细信息

关键词： Radar imaging

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Molecular modeling of hydrogen storage in carbon nanotubes: A combined molecular dynamics/ab initio orbital study

Molecular modeling of hydrogen storage in carbon nanotubes: ...

引用

2004 AIChE Annual Meeting

作者： Pricl, S. Coslanich, A. Fermeglia, M. Ferrone, M. Paneni, M.S. Romanel, F. Computer-aided System Laboratory Department of Chemical Environmental and Raw Materials Engineering University of Trieste Piazzale Europa 1 34127 Trieste Italy

The development of a model for hydrogen storage in carbon nanotubes was discussed. The molecular dynamics calculations were carried out for an armchair single-walled carbon nanotube (SWNT). The stabilization energy of a complex was calculated as a difference between the total energy of the complex and the sum of the energies of its constituent parts. The results show that a poisoning of SWNT by Co results in a total inactivation of the adsorption active sites, thus rendering the storage of hydrogen utterly unfeasible.

关键词： Carbon nanotubes

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computer simulation of polymer-organoclay nanocomposites for packaging applications: From binding energy to interlayer spacing predictions

Computer simulation of polymer-organoclay nanocomposites for...

引用

2004 AIChE Annual Meeting

作者： Pricl, S. Coslanich, A. Fermeglia, M. Ferrone, M. Paneni, M.S. Scocchi, G. Incarnato, L. Russo, G. Computer-aided System Laboratory Department of Chemical Environmental and Raw Materials Engineering University of Trieste Piazzale Europa 1 34127 Trieste Italy Italy

The use polymer-organoclay nanocomposites for packaging was analyzed. The estimation of the molecular surface areas and volumes of the quats was performed via the Connolly dot algorithm, corrected to account for quantom effects. It was found that the binding energy between the polyamides and the quat, and between the quat and the montmorillonite increased with increasing V, although with a different slope. Under the hypothesis that the clay platelets were uniformly dispersed within the polymer matrix, the pristine clay still yielded a high interfacial strength between montmorillnite (MMT) and the polyamines.

关键词： Polymers

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The self-organization of dynamic manufacturing network

The self-organization of dynamic manufacturing network

引用

ICMA 2004 - International Conference on Manufacturing Automation: Advanced Design and Manufacturing in Global Competition

作者： Li, G. Sun, L.-Y. Li, H.-Q. School of Management State Key Laboratory of Mechanical Manufacturing System Engineering Xi'an Jiaotong University China School of Computer Science Xi'an Shiyou University China

ISBN: (纸本)1860584683

A variety modeling approaches assume a relatively static manufacturing network structure and focus on optimizing the flow in the DMN (dynamic manufacturing network). These techniques are unable to model structural and behavioral dynamics of a DMN and little is known about how different manufacturing networks evolve and adapt. In this paper, it proposed a new paradigm for modeling and analysis of the DMN based on the self-organization paradigm. The diverse time-varying structures of a DMN emerge with the interaction of the enterprises with various goal directed behavior to fulfill the stochastic global demand. The DMN co-evolves over time and the environment. There is a co-symbiosis relationship among the various enterprises of the DMN. A simulation model based on multiagent approach indicates the emergence, co-evolution and co-symbiosis of the DMN. © Professional engineering Publishing 2004.

关键词： Factory automation

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A continuous stream service and high service availability mechanism for continuous media servers

A continuous stream service and high service availability me...

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6th International Conference on Advanced Communication Technology: Broadband Convergence Network Infrastructure

作者： Jung, Sung-In Lee, Cheol-Hoon Computer System Division Electron./Telecom. Res. Institute Daejon Korea Republic of Parallel Processing Laboratory Department of Computer Engineering Chungnam National University Daejon Korea Republic of

ISBN: (纸本)8955191197

Due to the explosive growth of the Internet, stream services are becoming more popular. The large media servers supporting thousands of concurrent media streams have to satisfy us with both good throughout and high availability. Although they are reciprocal from the viewpoint of system performance, the stream service continuity, as well as throughput, should be considered in clustered media servers. This is because media stream services should be continuously available to the clients even on the event of system failure. In this paper, we introduce service availability as the gauge of service degree on media servers, and present the basic scheme for guaranteeing continuous stream service. To do this, we propose LSS(Log Stream Status) and RRD(Ready Resource for instant Delivery) mechanisms. They are classified according to the status management method of stream service and the resumption method of closed service. Although these mechanisms require additional overhead, we found that they can be applied to clustered media servers with minimum overhead. Additionally, we concluded that they can provide higher quality of service availability on traditional clustered media servers.

关键词： Servers

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