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18th International Conference on Industrial and Engineering Applications of Artificial Intelligence and Expert systems: Innovations in Applied Artificial Intelligence, IEA/AIE 2005

作者： Námeth, Erzsábet Lakner, Rozália Hangos, Katalin M. Cameron, Ian T. Systems and Control Laboratory Computer and Automation Research Institute Budapest Hungary Department of Computer Science University of Veszprám Veszprám Hungary School of Engineering University of Queensland Brisbane Australia

ISBN: (纸本)3540265511

A diagnostic expert system established on model-based reasoning for on-line diagnosis and loss prevention is described in the paper. Its diagnostic "cause-effect" rules and possible actions (suggestions) are extracted from the results of standard HAZOP analysis. Automatic focusing as well as "what-if" type reasoning for testing hypothetical actions have been also implemented. The diagnostic system is tested on a granulator drum of a fertilizer plant in a simulation test-bed. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Artificial intelligence

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Classification of multichannel EEG data using length/energy transforms

Classification of multichannel EEG data using length/energy ...

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IEEE International Workshop on Computational Advances in Multi-Sensor Adaptive Processing (CAMSAP)

作者： D. Gutierrez F. Garcia-Nocetti J. Solano-Gonzalez Department of Computer Systems Engineering and Automation Institute of Research in Applied Mathematics and Systems Mexicali Mexico

We propose the use of length and energy transforms in the classification of multichannel EEG data to identify different cognitive activity using a reduced set of recording electrodes. The length transform (ET) represents a temporarily smoothed time course of the data, while the energy transform (ET) can be interpreted as a short-term energy estimate. The transformation of the data in the length/energy domain allows to effectively preserving important data features when autoregressive (AR) models are used to reduce the dimension of the classification problem. We evaluate the performance of the ET and ET on the classification of real cognitive EEG data for the case when the optimal AR model is selected under the Schwarz's Bayesian criterion (SBC) and a Mahalanobis distance-based classifier is used. Our results show that accurate classification is achieved when the data is transformed through the ET or ET even for low-order AR models, having the ET slightly better performance

关键词： Electroencephalography Brain modeling Signal processing Bayesian methods Brain computer interfaces Finite impulse response filter Robustness Power engineering and energy systems engineering and theory automation

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Improving handling of vehicles with active suspensions

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International Journal of Vehicle Autonomous systems 2005年第2-4期3卷 134-151页

作者： Gaáspaár, P. Bokor, J. Computer and Automation Research Institute Hungarian Academy of Sciences Kende u. 13-17 H-1111 Budapest Hungary Systems and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences Hungary Systems and Control Laboratory Computer and Automation Research Institute Hungary Control and Transport Automation Department Budapest University of Technology and Economics Hungary

In this paper an active suspension system which guarantees passenger comfort in normal cruising and rollover prevention in emergencies is proposed. In the control design the changes in forward velocity, the normalised load transfer, the performance specifications both for rollover and suspension problems, and the model uncertainties are taken into consideration. By selecting scheduling variables, a Linear Parameter Varying model is constructed, which is the basis of the control design. The operation of the active suspension is demonstrated in a cornering manoeuvre. Copyright © 2005 Inderscience Enterprises Ltd.

关键词： Vehicle suspensions

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Surface description for cornea topography using modified chebyshev-polynomials

Surface description for cornea topography using modified che...

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作者： Soumelidis, Alexandros Fazekás, Zolán Schipp, Ferenc Németh, János Computer and Automation Research Institute Systems and Control Laboratory Budapest Hungary Department of Numerical Analysis Eötvös Loránd University Budapest Hungary 1st Department of Ophthalmology Semmelweis University Budapest Hungary

ISBN: (纸本)008045108X

The optical behaviour of the (human) cornea is often characterized with the Zernike-coefficients derived via the Zernike-transform of its optical power map. in this paper, a radial transform based on the Chebyshev-polynomials of the second kind is suggested for a surface-based, rather than an optical power map based representation of the cornea. This transform is well-suited for providing compact representations for quasi-hemispherical surfaces, and after appropriate argument-transform applied to these polynomials also for spherical-calotte-like surfaces. Examples illustrating the effect of the argument-transformation are also included in the paper. Copyright © 2005 IFAC.

关键词： Medical applications

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Real-time 3D graphics systems: From simulators to virtual studios

Real-time 3D graphics systems: From simulators to virtual st...

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15th International Conference on computer Graphics and Vision, GraphiCon 2005

作者： Dolgovesov, Boris S. Mazurok, Boris S. Shevtsov, Maxim U. V.rukhlinskiy, Alexey Morozov, Boris B. Fomichev, Vladimir M. V.pekarskiy, Alexandr Naumov, B.A. Laboratory of Synthesizing Visualization Systems Institute of Automation and Electrometry Russia Novosibirsk State University Russia Institute of Automation and Electrometry Russia Computer Graphics Laboratory Department of IAE Russia Institute of Microprocessor Computer Systems RAS Nakhimovsky prospect 36/1 Moscow GSP-7 117997 Russia Cosmonaut Training Yu. A. Gagarin Russian State Scientific-Research and Test Centre of Russia Administrative Department Cosmonaut Training Yu. A. Gagarin Russian State Scientific-Research and Test Centre Russia

The paper deal with 3D graphics simulators history. Several generation of space simulators that were used in training centers including Yu. A. Gagarin Russian State Scientific-research and Test Centre of Cosmonaut Training (Moscow, Russia) are discussed. Number of US-Russia international space station programs use these cosmonaut training system in order to increase the efficiency of crews' space activities, and to ensure safe manned flights. Today we introduce powerful PC-based solution for Virtual Studio. Formal requirements for such a system are declared and its distributed architecture implementation is briefly outlined.

关键词： Simulators

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HIERARCHICAL MODELLING IN BIOLOGY: SYSTEMATIC BUILDING OF LIMB MODELS

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IFAC Proceedings Volumes 2005年第1期38卷 49-54页

作者： Cs. Fazekas Gy. Kozmann K.M. Hangos Department of Information Systems University of Veszprém Veszprém Hungary Department of Biomedical Engineering Research Institute for Technical Physics and Materials Sciences Budapest Hungary Systems and Control Laboratory Computer and Automation Research Institute Budapest Hungary

A multi-level model, that provides a hierarchically structured description of a complex, multi-scale limb system is proposed in this paper for predicting and analyzing movement patters generated by various activation signals. The levels, the sub-models on each level and their interconnections are developed and described following a systematic modelling procedure. The computational properties (degree of freedom and differential index) of the developed model have been analyzed and a sub-model has been transformed to meet the index-one requirement for solving the resulting differential algebraic equation (DAE) model by standard methods implemented in MATLAB. The model is extensively verified against engineering expectations using parameter values found in the literature, and a good agreement was found. Parameter sensitivity analysis has also been performed.

关键词： Biomedical system model hierarchical system muscle tendon aponeurosis pennation sarcomere

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Attaining program affordability through integration of logistical operations and health maintenance

Attaining program affordability through integration of logis...

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1st Space Exploration Conference: Continuing the Voyage of Discovery

作者： Goforth, Andre Karsai, Gabor Orosz, Michael Neches, Robert Szekely, Pedro Ashish, Naveen NASA Ames Research Center Moffett Field CA 94035-1000 United States Vanderbilt University Institute for Software Integrated Systems Nashville TN 37235 United States University of Southern California Information Sciences Institute Marina del Rey CA 90292 United States USRA Research Institute for Advanced Computer Science NASA Ames Research Center Moffett Field CA 94035 United States Code TC MS269-4 United States Department of Electrical and Computer Engineering Distributed Scalable Systems Division

ISBN: (纸本)1563477270

Program affordability needs to be built-in at the initial concept formulation stage. For NASA's space exploration vision this is critical for long range sustainability of human presence in space. What is often overlooked in the initial concept formulation of a large scale system endeavor such as NASA's Constellation program is the hidden cost of maintaining requisite operational safety margins and redundancy through adequate supply chain logistics. Ensuring adequate supply chain logistics necessitates the integration of operations and maintenance cycles. What enables this integration is the coordination and reconciliation across multiple equipment types of system health features and logistical information such as: (1) prognostic drivers from Integrated Vehicle Health Monitoring (IVHM) systems producing proactive condition-based "maintain me" demands, (2) maintenance management systems tracking usage and producing scheduled maintenance demands, (3) unscheduled maintenance demands resulting from any trouble reports entered by human observers of conditions missed by the IVHM system, and (4) implicit maintenance demands resulting from mission plans which require assignment of vehicular/robotic assets and consequently require assurance of the assigned assets' fitness for the intended tasks. In this paper we discuss how Coordinated Multi-source Maintenance on Demand (CMMD) technology, which is being is transitioned to the USMC Coherent Analytical Computing Environment (CACE) program and the Joint Strike Fighter Program, can be applied to the NASA domain, and its benefits in terms of mission affordability, operations efficiency and system health effectiveness. Using concepts derived from CMMD, we discuss the kind of IVHM capabilities needed to optimize multiple, parallel, yet inter-linked, operations-maintenance cycles, thereby optimizing program affordability while meeting specific mission supportability requirements across a broad range of mission scenarios.

关键词： Space research

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Array response kernels for EEG/MEG in single-shell ellipsoidal geometry

Array response kernels for EEG/MEG in single-shell ellipsoid...

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IEEE International Workshop on Computational Advances in Multi-Sensor Adaptive Processing (CAMSAP)

作者： D. Gutierrez A. Nehorai Department of Computer Systems Engineering and Automation Institute of Research in Applied Mathematics and Systems Mexicali Mexico Department of Electrical and Computer Engineering University of Illinois Chicago Chicago IL USA

We present analytical forward modeling solutions in the form of array response kernels for electroencephalography (EEG) and magnetoencephalography (MEG) assuming a single-shell ellipsoidal geometry that approximates the anatomy of the head and a dipole current models the source. The structure of our solution facilitates the analysis of the inverse problem by factoring the lead field into a product of the current dipole source and a kernel containing the information corresponding to the head geometry and location of the source and sensors. This factorization allows the inverse problem to be approached as an explicit function of just the location parameters, which reduces the complexity of the estimation solution search. Furthermore, the use of an ellipsoidal geometry is useful for cases when incorporating the anisotropy of the head is important but a better model cannot be defined

关键词： Kernel Electroencephalography Geometry Solid modeling Magnetic heads Magnetic analysis Brain modeling Inverse problems Analytical models Magnetoencephalography

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Design and implementation of a highperformance network intrusion prevention system

Design and implementation of a highperformance network intru...

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20th IFIP International Information Security Conference, IFIP/SEC 2005

作者： Xinidis, Konstantinos Anagnostakis, Kostas G. Markatos, Evangelos P. Institute of Computer Science Foundation for Research and Technology Hellas P.0 Box 1385 Heraklio GR-711-10 Greece Distributed Systems Laboratory CIS Department Univ. of Pennsylvania 200 S. 33rd Street PhiladelphiaPA19104 United States

ISBN: (纸本)038725658X

Network intrusion prevention systems provide proactive defense against security threats by detecting and blocking attack-related traffic. This task can be highly complex, and therefore, software-based network intrusion prevention systems have difficulty in handling high speed links. This paper describes the design and implementation of a high-performance network intrusion prevention system that combines the use of software-based network intrusion prevention sensors and a network processor board. The network processor acts as a customized load balancing splitter that cooperates with a set of modified content-based network intrusion detection sensors in processing network traffic. We show that the components of such a system, if co-designed, can achieve high performance, while minimizing redundant processing and communication. We have implemented the system using low-cost, off-theshelf technology: an IXP1200 network processor evaluation board and commodity PCs. Our evaluation shows that our enhancements can reduce the processing load of the sensors by at least 45% resulting in a system that can handle a fully-loaded Gigabit Ethernet link using at most four commodity PCs. Copyright © 2005 by International Federation for Information Processing.

关键词： Intrusion detection

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Efficient content-based detection of zero-day worms

Efficient content-based detection of zero-day worms

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IEEE International Conference on Communications (ICC)

作者： P. Akritidis K. Anagnostakis E.P. Markatos Foundation for Research & Technology Hellas Institute for Computer Science Heraklion Greece Distributed Systems Laboratory CIS Department University of Pennsylvania Philadelphia PA USA

Recent cybersecurity incidents suggest that Internet worms can spread so fast that in-time human-mediated reaction is not possible, and therefore initial response to cyberattacks has to be automated. The first step towards combating new unknown worms is to be able to detect and identify them at the first stages of their spread. In this paper, we present a novel method for detecting new worms based on identifying similar packet contents directed to multiple destination hosts. We evaluate our method using real traffic traces that contain real worms. Our results suggest that our approach is able to identify novel worms while at the same time the generated false alarms reach as low as zero percent.

关键词： computer worms Internet computer crime Telecommunication traffic Intrusion detection IP networks Payloads Detection algorithms computer science Laboratories

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