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A soft method for analyzing properties of Web documents

A soft method for analyzing properties of Web documents

引用

IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： D. Szego Department of Measurement and Information Systems Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Several different techniques for analyzing and transforming Web documents have been developed including document checking tools, document querying and transformation frameworks or search engines. These techniques are usually based on different theoretical approaches, hence some of them lack simple formal semantics or fuzzy extensions. This paper investigates the possibility of realizing Web document processing in the context of fuzzy description logics providing a simple but powerful method for analyzing fuzzy properties of Web documents.

关键词： Fuzzy logic XML Information filters HTML World Wide Web Information systems Power generation economics Electronic mail Search engines Web sites

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A sparse least squares support vector machine classifier

A sparse least squares support vector machine classifier

引用

International Joint Conference on Neural Networks (IJCNN)

作者： J. Valyon G. Horvath Department of Measurement and Information Systems Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Since the early 90's, support vector machines (SVM) are attracting more and more attention due to their applicability to a large number of problems. To overcome the high computational complexity of traditional support vector machines, previously a new technique, the least squares SVM (LS-SVM) has been introduced, but unfortunately a very attractive feature of SVM, namely its sparseness, was lost. LS-SVM simplifies the required computation to solving linear equation set. This equation set embodies all available information about the learning process. By applying modifications to this equation set, we present a least squares version of the least squares support vector machine (LS/sup 2/-SVM). The proposed modification speeds up the calculations and provides better results, but most importantly it concludes a sparse solution.

关键词： Least squares methods Support vector machines Support vector machine classification Equations Information systems Training data Constraint optimization Lagrangian functions Electronic mail Computational complexity

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Interactive transfer function control for Monte Carlo volume rendering

Interactive transfer function control for Monte Carlo volume...

引用

IEEE Symposium on Volume Visualization and Graphics

作者： B. Csebfalvi Department of Control Engineering and Information Technology Budapest University슠of슠Technology슠and슠Economics Hungary

Although Monte Carlo volume rendering (MCVR) is an efficient point-based technique for generating simulated X-ray images from large CT data, its practical application in medical imaging systems is limited by the relatively expensive preprocessing. The quality of images is strongly influenced by the transfer function, which maps a data value onto a sampling probability. An appropriate transfer function concentrates the point samples onto the region of interest. Since it is data dependent, a fine parameter tuning is necessary. However, the costly preprocessing has to be repeated whenever the transfer function parameters are modified. In this paper a new preprocessing algorithm is proposed for MCVR, which allows for an interactive transfer function control in the rendering phase, providing a visual feedback in a couple of seconds. In order to rapidly recompute point samples according to the modified transfer function, an efficient hybrid sampling strategy is applied, which combines the advantages of the probabilistic Monte Carlo sampling and the deterministic quasi-Monte Carlo sampling.

关键词： Transfer functions Monte Carlo methods Rendering (computer graphics) Sampling methods Medical control systems Image generation Medical simulation X-ray imaging Computed tomography Biomedical imaging

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A low-power current-mode correlation detector with analog data storage

A low-power current-mode correlation detector with analog da...

引用

IEEE Region 10 International Conference TENCON

作者： R. Kozma C. Horvath G. Hosszu F. Kovacs Department Electronic Devices Budapest University슠of슠Technology슠and슠Economics Hungary

A low-power, limited accuracy analog correlation circuit is proposed primarily for biomedical applications that process low-frequency signals. For storing the sampled analog values, a series of current switched capacitors are used, which offer the lowest sensitivity to external disturbances during data readout. The correlation was implemented in fully analog form applying the Manhattan method. The analog part of the comparator requires less than 1.3 mA, excluding the timing and supervising microcontroller. Applying the circuitry for phonocardiographic fetal heart rate (FHR) measurements, exhaustive simulations with real input sound records have shown that it can reliably identify the correlation peaks to calculate FHR with more than 90% confidence.

关键词： Detectors Memory Energy consumption Fetal heart rate Autocorrelation Analog circuits MOS capacitors Digital circuits Power generation economics Signal processing

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UML based design of time triggered systems

UML based design of time triggered systems

引用

International Symposium on Object-Oriented Real-Time Distributed Computing

作者： I. Majzik G. Pinter P.T. Kovacs Department of Measurement and Information Systems Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

This paper presents how the platform-specific development environment of time-triggered (TT) systems can be integrated with a visual design toolkit based on UML. The built-in facilities of UML and the modeling extensions introduced by us enable the unification of the advantages provided by both the embedded development environment and the UML tools. UML offers visual design, automatic code and documentation generation, while the underlying TT development environment offers platform-specific task and communication scheduling and fault tolerance middleware construction. This results in an integrated system that is capable of supporting the entire development within the framework of the UML tool

关键词： Unified modeling language Object oriented modeling Real time systems Documentation Fault tolerance Middleware Hardware Embedded system Operating systems Computer architecture

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Modeling of a combined photovoltaic/thermal energy system

Modeling of a combined photovoltaic/thermal energy system

引用

International Conference on Power Electronics and Motion Control (IPEMC)

作者： R.K. Jardan I. Nagy Department of Automation and Applied Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

The utilization of solar energy can be made by photovoltaic (PV) cells to generate electric power directly and solar thermal (T) panels can be applied to generate heat power. When the utilization of the solar energy is necessary to generate electric power, the option of using T panels in combination with some heat/electric power conversion technology can be viable solution. The power generated by utilizing the solar energy absorbed by a given area of solar panel can be increased if the two technologies, PV and T cells, are combined in such a way that the resulting unit will be capable of cogeneration of heat and electric power. A is system proposed for converting the energy, obtained from solar radiation, into electric energy. The combined photovoltaic/thermal panels are connected to a heat/electric energy conversion system converts heat energy into mechanical energy that is converted further into electric energy by a turbine-generator-converter unit connected to the utility mains or a group of loads. The development and design of the system is made by extensive use of modeling and simulation techniques. In the paper a part of the simulation studies, carried out to determine the energy balance in the electric energy conversion section of the system, assuming standalone operation is presented. The energy balance in the long run is basically determined by the energy supplied by the photovoltaic cells and the energy consumed by the load. Simulation results are presented that show the operation of the PV part of the system in a longer period of time.

关键词： Photovoltaic systems Solar power generation Cogeneration Power generation Solar energy Solar heating Resistance heating Energy conversion Power system modeling Solar radiation

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Impact of statechart implementation techniques on the effectiveness of fault detection mechanisms

Impact of statechart implementation techniques on the effect...

引用

EUROMICRO Conference

作者： G. Pinter I. Majzik Department of Measurement and Information Systems Budapest University슠of슠Technology슠and슠Economics Hungary

This work presents the analysis of an experiment series aiming at the discovery of the impact of two inherently different statechart implementation methods on the behavior of the resulting executables in the presence of faults. The discussion identifies the key features of implementation techniques influencing the effectiveness of standard fault detection mechanisms (memory protection, assertions etc.) and an advanced statechart-level watchdog scheme used for detecting the deviations from the abstract implementation-independent behavioral specification.

关键词： Fault detection Application software Fault diagnosis Protection Unified modeling language Information systems Information analysis Rail transportation Control systems Failure analysis

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FPGA implementation of the kernel CMAC

FPGA implementation of the kernel CMAC

引用

International Joint Conference on Neural Networks (IJCNN)

作者： G. Horvath Z. Csipak Department of Measurement and Information Systems Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Cerebellar model articulation controller (CMAC) neural network is a real alternative to MLP and RBF and has some advantageous features: its training is fast and its architecture is especially suitable for digital hardware implementation. The price of these attractive features is its rather poor capability. The poor capability can be improved if a recently proposed regularization and/or a kernel version of the CMAC is used. The paper presents the first results of a study about the efficient hardware realization of various versions of CMAC. Three versions have been developed: the classical Albus CMAC, its regularized version, which has better generalization capability and a kernel CMAC. The solutions, that were developed using high-level synthesis (Handel C), are based on Virtex FPGA.

关键词： Field programmable gate arrays Kernel Neural networks Feedforward systems Information systems Electronic mail Neural network hardware High level synthesis Additives Complex networks

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Enhanced utilisation of solar radiation for the generation of electric energy

Enhanced utilisation of solar radiation for the generation o...

引用

AFRICON Conference

作者： R.K. Jardan I. Nagy N. Schendl Department of Automation and Applied Information Budapest University슠of슠Technology슠and슠Economics Hungary

In this paper, a system is proposed for converting an increased portion of the energy, obtained from solar radiation, into electric energy. The utilisation of solar energy can be made by photovoltaic (PV) cells to generate electric power directly and solar thermal (T) panels can be applied to generate heat power. In the system studied, combined photovoltaic/thermal panels are connected to a heat/electric energy conversion unit that consists of a heat conversion and a turbine-generator-converter section, connected to the utility mains or a group of loads, while the electric power obtained from the PV part of the combined panels is converted to a suitable form by a system consisting of a charge controller, a battery and a DC/AC converter. In the paper, a part of the simulation studies, carried out to determine the energy balance in the PV section of the system, is shown in detail. A block diagram developed for studying the energy balance and simulation results are presented, showing the battery charge vs. time as well as the photovoltaic cell current and the battery current

关键词： Solar radiation Solar power generation Cogeneration Batteries Photovoltaic systems Power generation Solar energy Solar heating Thermal loading Energy conversion

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Signature coding and information transfer for the multiple access adder channel

Signature coding and information transfer for the multiple a...

引用

IEEE (first ITW conference of the year) Information Theory Workshop (ITW)

作者： L. Gyorfi B. Laczay Department Computer Science and Information Theory Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

We deal with the coding problem of the multiple-access adder channel, considering both the identification of the active users and decoding of their messages. We examine the bounds on the minimal length of codes solving these tasks. We examine codes solving both tasks simultaneously, and we give asymptotic upper and lower bounds on the length of the shortest possible code. Our new bounds are quite similar to the bounds known for the identification task only. The difference between the upper and lower bounds is a factor of two.

关键词： Decoding Computer science Communication systems Computer networks Mobile handsets Communication channels High-speed networks US Government Licenses

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