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Superframe formation algorithms in 802.15.3 networks

Superframe formation algorithms in 802.15.3 networks

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IEEE Conference on Wireless Communications and Networking

作者： A. Torok L. Vajda Kyu-Jung Youn Sun-Do June Department of Telecommunications and Media Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Wireless PAN Technology Project Office Korea Electronics and Technology Institute Seoul South Korea

The IEEE 802.15.3 wireless standard aims to achieve high performance and scalability by using a hybrid, time-slotted MAC protocol with variable length superframes. The design of a proper superframe formation algorithm is not trivial. This can be attributed to some limitations in the possibilities of superframe resizing. Based on our findings, we propose a novel superframe formation algorithm, which avoids the pitfalls of current algorithms. A comprehensive performance analysis with various performance metrics and different types of traffic is presented in the paper. The proposed algorithm is a low complexity solution that supports power-saving and proper treatment of CBR traffic, while it provides higher channel utilization, higher error tolerance and stability.

关键词： Intelligent networks Access protocols Algorithm design and analysis Media Access Protocol Wireless application protocol Data communication Performance analysis Quality of service Heuristic algorithms Bluetooth

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Reference signal control of the TORA system: a TP model transformation based approach

Reference signal control of the TORA system: a TP model tran...

引用

IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： Z. Petres B. Resko P. Baranyi Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Hungary Integrated Intelligent Systems Japanese-Hungarian Laboratory Budapest University슠of슠Technology슠and슠Economics Hungary

This paper presents a case study of the TP (tensor product) model transformation in the control of a nonlinear benchmark problem. We design a nonlinear controller of translational oscillation with an eccentric rotational proof mass actuator (TORA) system via TP model transformation and LMI (linear matrix inequality) based controller design technique that is also capable of the reference signal tracking control. The main contribution of the paper is to show that both numerical methods the TP model transformation and the LMI can readily be executed by computer independently on the given problem and without analytical derivations, which, hence, leads to a fast way of controller designs for a class of engineering control problems. Numerical simulation is used in the paper to provided empirical validation of the control results.

关键词： Automatic control Tensile stress Weight control Nonlinear control systems Control design Signal design Intelligent systems Laboratories Automation Electronic mail

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RMD-a lightweight application of NSIS

RMD-a lightweight application of NSIS

引用

NETWORKS International Telecommunications Network Strategy and Planning Symposium

作者： G. Karagiannis A. Bader G. Pongracz A. Csaszar A. Takacs R. Szabo S.L. Westberg Twente Univ. Enschede Netherlands Traffic Laboratory Ericsson Research Hungary Budapest Hungary Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Ericsson Research Canada Stockholm Sweden

Resource management in DiffServ (RMD) framework is a simple, effective and scalable signaling method for resource reservation within a DiffServ domain. In the present paper we describe the way of integrating RMD in the future NSIS QoS application protocol that is under standardization in IETF. We demonstrate that the RMD edge-to-edge signaling is able to inter-work with end-to-end resource reservation protocols e.g. RSVP. Basic performance measurements and evaluation, comparing RMD and RSVP, are also shown.

关键词： Protocols Quality of service Peer to peer computing Diffserv networks Network address translation Laboratories Resource management Standardization Measurement Web and internet services

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Characterization of the temporal pattern of cerebral blood flow oscillations

Characterization of the temporal pattern of cerebral blood f...

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International Joint Conference on Neural Networks (IJCNN)

作者： Balazs Benyo Gabor Lenzser Bela Palancz Department of Informatics Széchcnyi István University Gyor Hungary Institute of Human Physiology Semmelweis University Budapest Hungary Department of Photogrammetry Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

ISBN: (纸本)0780383591

Oscillation of the cerebral blood flow (CBF) is a common feature in several physiological or pathophysiological states of the brain. It is a promising opportunity to identify the state of the brain based on the classification of CBF signals. In order to carry out classification of the time signals, a feature vector has been extracted to characterize the signals. Unsupervised classification showed that the extracted feature vector is an acceptable representation of the time signals. It also turned out that the difference between normal signal and a signal indicating drug injection effect is significant, and much more dominant than the difference between signals of the right and left brain sides. For the signal classification an artificial neural network (ANN) model based on supervised backpropagation network has been developed and successfully applied.

关键词： Blood flow Discrete wavelet transforms Artificial neural networks Feature extraction Pattern classification Backpropagation Network synthesis Informatics Humans Physiology

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Design of bang-bang control for dual channel DC-DC buck and boost converter

Design of bang-bang control for dual channel DC-DC buck and ...

引用

International Workshop on Advanced Motion Control (AMC)

作者： I. Denes R. Barabas I. Nagy E. Masada Department of Automation and Applied Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Computer and Automation Research Institute Hungarian Academy of Sciences Hungary Science University of Tokyo Japan

The paper is concerned with the design of the bang-bang control for dual channel DC-DC buck and boost converter. The quality of the control is characterized by two quality figures, the voltage ripple and the voltage error. An optimum design method is described to realize good quality figures. When the output voltage is higher (lower) than the reference voltage the lower (higher) switching frequency is selected. In order to reduce the output voltage ripple the lower switching frequency is changed with the variation of the load. Calculation and simulation results of the two quality figures are presented and compared.

关键词： Bang-bang control DC-DC power converters Voltage control Switches Frequency Resonance Steady-state Circuits Capacitors Inductors

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Cost-optimal VPN based VoIP network design

Cost-optimal VPN based VoIP network design

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NETWORKS International Telecommunications Network Strategy and Planning Symposium

作者： D. Orincsay B.G. Jozsa L. Tamasi Dept. of Telecommun. & Media Informatics Budapest Univ. of Technol. Hungary Department of Telecomminications and Media Informatics Budapest University슠of슠Technology슠and슠Economics Hungary

This work addresses the design of cost-optimal VoIP networks. In our model the whole VoIP network is divided into two logical components: the access network and the transport network. The access network consists of the VoIP end-points that connect to the transport network through edge routers serving as gateways. Since more edge routers may be available for a given VoIP node, one task of the design process is to assign a particular edge router to every VoIP node. The edge routers have to be connected in such a way that security and availability can be assured for the VoIP traffic. One obvious approach to fulfilling these requirements is to define a VPN, which is assumed throughout the paper. Supposing large volume of VoIP traffic the cost of the VPN can be significant. Thus the other task of VoIP network design is to specify the transport VPN in the most economical way. These two tasks of VoIP network design can be solved separately using existing methods. Nevertheless, the VoIP region specification influences the cost of the final solution to a great extent. Therefore, in This work we propose a novel solution in which the edge router assignment takes the objective function of VPN specification into consideration. Moreover, a numerical analysis is provided with the help of simulations.

关键词： Virtual private networks Internet telephony Telecommunication traffic Costs Traffic control Informatics Electronic mail Process design Numerical analysis Analytical models

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Codes in the codons: construction of a codon/amino acid periodic table and a study of the nature of specific nucleic acid-protein interactions

Codes in the codons: construction of a codon/amino acid peri...

引用

Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： B. Benyo J.C. Biro Z. Benyo Department of Informatics Széchenyi István University Gyor Hungary Karolinska Institute Stockholm Sweden Department of Control Engineering and Information Technology Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

The theory of "codon-amino acid coevolution" was first proposed by Woese in 1967. It suggests that there is a stereochemical matching - that is, affinity - between amino acids and certain of the base triplet sequences that code for those amino acids. We have constructed a common periodic table of codons and amino acids, where the nucleic acid table showed perfect axial symmetry for codons and the corresponding amino acid table also displayed periodicity regarding the biochemical properties (charge and hydrophobicity) of the 20 amino acids and the position of the stop signals. The table indicates that the middle (2/sup nd/) amino acid in the codon has a prominent role in determining some of the structural features of the amino acids. The possibility that physical contact between codons and amino acids might exist was tested on restriction enzymes. Many recognition site-like sequences were found in the coding sequences of these enzymes and as many as 73 examples of codon-amino acid co-location were observed in the 7 known 3D structures (December 2003) of endonuclease-nucleic acid complexes. These results indicate that the smallest possible units of specific nucleic acid-protein interaction are indeed the stereochemically compatible codons and amino acids.

关键词： Amino acids Proteins Biochemistry Sequences Informatics Testing Genetics Periodic structures Control engineering Information technology

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Brain image segmentation for virtual endoscopy

Brain image segmentation for virtual endoscopy

引用

Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： L. Szilagyi Z. Benyo S.M. Szilagyi Department of Control Engineering and Information Technology Budapest University슠of슠Technology슠and슠Economics Hungary Department of Technical and Human Science Sapientia Hungarian Science University of Transylvania Marosvasarhely Romania

This work presents an algorithm for fuzzy segmentation of MR brain images. Starting from the standard FCM and its bias-corrected version BCFCM algorithm, by splitting up the two major steps of the latter, and by introducing a new factor /spl gamma/, the amount of required calculations is considerably reduced. The algorithm provides good-quality segmented 2-D brain slices a very quick way, which makes it an excellent tool to support a virtual brain endoscope.

关键词： Brain Image segmentation Endoscopes Filtering Biomedical imaging Image processing Image reconstruction Image quality Prototypes Labeling

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Construction of fuzzy signature from data: an example of SARS pre-clinical diagnosis system

Construction of fuzzy signature from data: an example of SAR...

引用

IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： Kok Wai Wong T. Gedeon L. Koczy School of Computer Engineering Nanyang Technological University Singapore Department of Computer Science Australian National University Acton ACT Australia Department of Telecommunication & Telematics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

There are many areas where objects with very complex and sometimes interdependent features are to be classified; similarities and dissimilarities are to be evaluated. This makes a complex decision model difficult to construct effectively. Fuzzy signatures are introduced to handle complex structured data and interdependent feature problems. Fuzzy signatures can also be used in cases where data is missing. This work presents the concept of a fuzzy signature and how its flexibility can be used to quickly construct a medical pre-clinical diagnosis system. A severe acute respiratory syndrome (SARS) pre-clinical diagnosis system using fuzzy signatures is constructed as an example to show many advantages of the fuzzy signature. With the use of this fuzzy signature structure, complex decision models in the medical field should be able to be constructed more effectively.

关键词： Fuzzy systems Fuzzy sets Data mining Computer science Medical diagnostic imaging Fuzzy set theory Humans Medical control systems Input variables Computational efficiency

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Experiments with a hierarchical text categorizer

Experiments with a hierarchical text categorizer

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IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： Domonkos Tikk Gyorgy Biro Jae Dong Yang Department of Telcom. and Media Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Textminer Limited Budapest Hungary Department of Computer Science Chonbuk National University of Korea Cheongju South Korea

ISBN: (纸本)0780383532

HITEC is a hierarchical text categorizer tool that is based on UFEX (universal feature extractor) algorithm. This paper presents experiments on the effectiveness of HITEC on several natural languages (English, German) and with various kinds of text corpora. The obtained results show that HITEC outperforms its known competitors on the investigated corpora, and its performance is independent from the processed languages. The time and storage requirement of HITEC is considerable, therefore it can be run on an average PC.

关键词： Text categorization Taxonomy Databases Feature extraction Natural languages Internet XML Telecommunications Informatics Power generation economics

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