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检索条件"任意字段=6th International Conference on Algorithms and Discrete Applied Mathematics"

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Multivariate Spectral Analysis of Electroencephalography Data

Multivariate Spectral Analysis of Electroencephalography Dat...

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6th international IEEE EMBS conference on Neural Engineering (NER)

作者： Lainscsek, Claudia Hernandez, Manuel E. Poizner, Howard Sejnowski, Terrence J. Salk Inst Biol Studies Howard Hughes Med Inst Computat Neurobiol Lab La Jolla CA 92037 USA Univ Calif San Diego Inst Neural Computat La Jolla CA 92093 USA Univ Calif San Diego Grad Program Neurosci La Jolla CA 92093 USA

ISBN: (纸本)9781467319690

We propose a time-domain approach to detect cross-trial frequencies based on nonlinear correlation functions. this method is a multivariate extension of discrete Fourier transform (DFT) and can be applied to short and/or sparse time series. Cross-trial and/or cross-channel spectra (CTS) can be obtained for electroencephalography (EEG) data where multiple short data segments of the same experiment are available. there are two versions of CTS: the first one assumes some phase coherency across the trials while the second one is independent of phase coherency. We demonstrate that the phase dependent version is more consistent with traditional spectral methods as implemented in EEGLAB. this multivariate spectral analysis is a spatio-temporal extension of DFT and should not be confused with cross-spectral analysis. We applied this method to EEG data recorded while participants reached for and grasped a virtual object where we compared a cross-trial spectrogram (CTS) of data around a stimulus with traditional event related spectral perturbations (ERSP) analysis. We show that CTS can be applied to shorter data windows than ERSP by using spatio-temporal information in the EEG and therefore yields higher temporal resolution. Furthermore a CTS can be computed for each individual subject while ERSP is commonly computed on a whole population of subjects.

关键词： discrete Fourier transforms electroencephalography medical signal detection multivariable systems spatiotemporal phenomena spectral analysis time series time-domain analysis

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Trace representation of quasi-negacyclic codes

Trace representation of quasi-negacyclic codes

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6th international conference on Brain Inspired Cognitive Systems, BICS 2013

作者： Li, Xiuli Fu, Chenghua School of Mathematics and Physics Qingdao University of Science and Technology Qingdao 266000 China

ISBN: (纸本)9783642387852

the alphabet decomposition of quasi-negacyclic codes is developed. By the use of the Chinese Remainder theorem (CRT), or of the discrete Fourier Transform (DFT), the ring Fq [X]/〈xm + 1〉 can be decomposed into a direct product of fields. the trace representation for quasi-negacyclic codes generalizes nicely the trace representation of cyclic and quasi-cyclic codes. Furthermore quasi-negacyclic codes are constructed by Vandermonde matrices. © 2013 Springer-Verlag.

关键词： discrete Fourier transforms

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Design of Directional Selection for three-dimensional Complex discrete Wavelet Transform

Design of Directional Selection for Three-dimensional Comple...

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6th international conference on Machine Vision (ICMV)

作者： Kato, Takeshi Zhang, Zhong Toda, Hiroshi Imamura, Takashi Miyake, Tetsuo Ishikawa, Yasuhiro Toyohashi Univ Technol Dept Mech Engn Instrumentat Syst Lab Toyohashi Aichi Japan Ishikawa Med Clin Tokyo Ishikawa Japan

ISBN: (纸本)9780819499967

In this paper, we propose the novel design method of directional selection for three-dimensional complex discrete wavelet transform (3D-CDWT) (hereafter, all abbreviations will be written with capital letters). Previously, the complex discrete wavelet transform has been able to extract directional edges from images using the directional selection property. this can be applied to shape and texture analysis. However the angular range of each directional edge is still unclear and the angular ranges are fixed. thus, it is difficult to be applied to image processing. therefore, we firstly clarify the angular range of directional edges by using frequency characteristics. Secondly, we propose a design method for the angular range of directional edges with a desirable angular range. As a result, we can clarify the angular ranges of directional edges and it is possible to obtain the directional edges with arbitrary angular range.

关键词： complex wavelet transform directional selection shift-invariant 3-D image processing

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A novel architecture for a framework to support the storage of network simulation data into distributed storages for remote access 6

A novel architecture for a framework to support the storage ...

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6th international conference on Simulation Tools and Techniques, SIMUTools 2013

作者： Colizza, Maurizio De Nardis, Luca Patrizi, Marco Rinaldi, Claudia Center of Excellence DEWS Italy Sapienza University of Rome Italy University of L'Aquila Italy

ISBN: (纸本)9781936968763

Design, implementation and test of a communication network require the use of tools allowing the execution of simulations accurate enough to enable: a) the assessment of the correctness of the algorithms that govern the behavior of the nodes;b) the simulation of actual operating conditions in terms of accuracy of channel and mobility models, as well as of traffic conditions and network usage, in order to verify compliance with the QoS parameters;c) simulation code reusing on target devices. Simulation of Mobile Ad-hoc NETworks (MANETs), designed for civil and or military use is particularly challenging, due to high number of nodes, different mobility and channel models and different types of traffic and QoS requirements, and led to the design of several network simulators. Among them, OMNeT++, OPNET and ns-3 are arguably the most popular ones for scientific and industrial activities. Each of the above simulators is characterized by specific advantages and drawbacks, as well as different available models. Although they share an approach based on discrete event simulation, they are significantly different in the way the user provides inputs, collects outputs and builds his/her own models. In this paper we propose a methodology to store simulation data in a distributed and scalable storage system that is exploitable in any of the above listed simulators. Furthermore, the paper illustrates a way to apply the proposed methodology to an emulation environment. Copyright © 2013 ICST 978-1-936968-76-3.

关键词： discrete event simulation

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A Hybrid Semi-Blind Gray Scale Image Watermarking Algorithm Based on DWT-SVD using Human Visual System Model

A Hybrid Semi-Blind Gray Scale Image Watermarking Algorithm ...

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6th international conference on Contemporary Computing (IC3)

作者： Mehta, Rajesh Rajpal, Navin USICT Guru Gobind Singh Indrarprastha Univ New Delhi India

ISBN: (纸本)9781479901920

To achieve good imperceptibility and robustness, a hybrid image watermarking algorithm based on discrete wavelet transform (DWT) and singular value decomposition (SVD) is proposed using the characteristics of human visual system model for copyright protection and authenticity. In the proposed watermarking algorithm, one level DWT is applied to selected image blocks to obtain four sub-bands of each block and then the U component of low frequency sub-band (LL) obtained after SVD transformation is explored under different threshold values for embedding and extracting the watermark. the experimental results show that HVS model based hybrid image watermarking scheme is imperceptible and robust against several image processing operations like JPEG compression, median filtering, sharpening, cropping and addition of Gaussian noise. Peak signal to noise ratio (PSNR) and bit correction rate (BCR) are used to measure the quality of watermarked image and extracted watermark respectively.

关键词： Singular value decomposition discrete wavelet transform Image watermarking Copyright Human Visual Model

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A Novel Image Watermarking Approach

A Novel Image Watermarking Approach

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6th international conference on Recent Advances in Space Technologies (RAST)

作者： Duymaz, Erol Akan, Aydin Turkish Air Force Acad Istanbul Turkey Istanbul Univ Elect Elect Engn Istanbul Turkey

ISBN: (纸本)9781467363969;9781467363952

Watermarking is a basic secure communication method. It is used for embedding a recognizable pattern in media in such a manner that modification of the media also modifies the pattern, thus making it easy to detect the modification. this technique and its variants have many practical applications pertaining to secure communications, media verification, etc. Digital image watermarking is a technique for embedding data within an image signal in such a way that the original and the modified image signals are essentially identical. the embedded data can be used for various purposes such as secure communication in military applications, owner identification and verification, content authentication, etc. In this study a watermark image signal is hidden in a message image signal by using a discrete cosine transform (DCT) domain approach. the tests of fidelity between the original and the watermarked signal and robustness applied to the watermarked signal. the results with both the Human Visiual System (HVS) and numeric/graphic aspects are presented. the results show that an embedded watermark is not easily detectable using either the HVS or other techniques. Additionally, it can be detected successfully in the simulation domain, but it may be susceptible to some noise and channel limitations in the real world.

关键词： discrete cosine transforms graph theory image watermarking telecommunication security

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Reliability of tunnel ventilation control: A conceptual design

Reliability of tunnel ventilation control: A conceptual desi...

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19th ISSAT international conference on Reliability and Quality in Design, RQD 2013

作者： Nyvlt, Ondrej Ferkly, Lukas Sulcz, Jan in Prague Nam. Stna 3105 272 01 Kladno 2 Czech Republic in Prague Technicka 2 166 27 Praha 6 Czech Republic

ISBN: (纸本)9780976348696

this paper discusses a preliminary design of a High-level control loop of a ventilation system in the Blanka tunnel, which is a part of the City Circle Road in Prague, Czech Republic. the design is based on a discrete Event System (DES) model of ventilation system states, which is actually an adapted Markov diagram. the first objective of the DES model is to specify all causes of state transitions. this task includes assessment of actions connected with states and state transitions, which should be implemented in high-level control algorithms and subordinate Programmable Logic Controllers. that means, that model presented here determines behavior of these system control elements. the second objective of the model is a reliability analysis for obtaining state probabilities and finding weak points in the control loop structure.

关键词： discrete event simulation

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Contact detection acceleration in pebble flow simulation for pebble bed reactor systems

Contact detection acceleration in pebble flow simulation for...

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international conference on mathematics and Computational Methods applied to Nuclear Science and Engineering, M and C 2013

作者： Li, Yanheng Ji, Wei Department of Mechanical Aerospace and Nuclear Engineering Rensselaer Polytechnic Institute 110 8th street Troy NY 12180 United States

ISBN: (纸本)9781627486439

Pebble flow simulation plays an important role in the steady state and transient analysis of thermal-hydraulics and neutronics for Pebble Bed Reactors (PBR). the discrete Element Method (DEM) and the modified Molecular Dynamics (MD) method are widely used to simulate the pebble motion to obtain the distribution of pebble concentration, velocity, and maximum contact stress. Although DEM and MD present high accuracy in the pebble flow simulation, they are quite computationally expensive due to the large quantity of pebbles to be simulated in a typical PBR and the ubiquitous contacts and collisions between neighboring pebbles that need to be detected frequently in the simulation, which greatly restricted their applicability for large scale PBR designs such as PBMR400. Since the contact detection accounts for more than 60% of the overall CPU time in the pebble flow simulation, the acceleration of the contact detection can greatly enhance the overall efficiency. In the present work, based on the design features of PBRs, two contact detection algorithms, the basic cell search algorithm and the bounding box search algorithm are investigated and applied to pebble contact detection. the influence from the PBR system size, core geometry and the searching cell size on the contact detection efficiency is presented. Our results suggest that for present PBR applications, the bounding box algorithm is less sensitive to the aforementioned effects and has superior performance in pebble contact detection compared with basic cell search algorithm.

关键词： Efficiency

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Numerical computation studies between a new algorithm, power, and QR iterative algorithms for solution of eigenvalue of essentially positive matrices

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6th international conference on Management Science and Engineering Management, ICMSEM 2012

作者： Oepomo, Tedja Santanoe Science Technology Engineering and Mathematics Division West LA/LA Harbor Colleges School of Business California International University 1301 Las Riendas Drive La Habra CA 90631 United States

ISBN: (纸本)9781447145998

the aim of this manuscript is to study and to compare several iterative procedures based on Oepomo, Power, and QR methods for solving dominant eigenvalues of essentially positive matrices. Ascending and descending techniques lead to a new iterative method, new algorithm. the new technique was compared to the Power and QR methods in term of speed of convergence, number of required mathematical operations, and effectiveness to numerically calculate dominant eigenvalues of essentially positive matrices. Numerical examples illustrate the purpose. © 2013 Springer-Verlag.

关键词： Iterative methods

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Exact bounds for average pairwise network reliability 13

Exact bounds for average pairwise network reliability

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7th international conference on Ubiquitous Information Management and Communication, ICUIMC 2013

作者： Rodionov, Alexey Rodionova, Olga Prospect Akademika Institute of Computational Mathematics and Mathematical Geophysics SB RAS Lavrentjeva 6 Novosibirsk 630090 Russia Higher College of Informatics Novosibirsk State University Russkaya 35 Novosibirsk 630058 Russia

ISBN: (纸本)9781450319584

Several methods for finding exact bounds of average pairwise network connectivity (APNC) are proposed. these methods allows faster decision making about if a network is reliable for its purpose. Previous results on cumulitive updating of all-terminal probabilistic connectivity and exact algorithms for calculating average number of disconnected pairs of nodes in a random graph are used as a base for most of presented results. Copyright © 2013 ACM.

关键词： Decision making

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