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13th International Conference on correlation Optics

作者： Derkachov, G. Jakubczyk, D. Kolwas, K. Shopa, Y. Wozniak, M. Wojciechowski, T. Polish Acad Sci Inst Phys Al Lotnikow 32-46 PL-02668 Warsaw Poland Cardinal Stefan Wyszynski Univ Warsaw 5 Dewajtis St PL-01815 Warsaw Poland Int Res Ctr MagTop Al Lotnikow 32-46 PL-02668 Warsaw Poland

ISBN: (数字)9781510617285

ISBN: (纸本)9781510617285;9781510617278

The dynamic light scattering (DLS) technique was used for studying the processes of aggregation of spherical SiO2 particles in various diethylene glycol (DEG) suspensions. The suspensions were studied in a cuvette, in a millimeter-sized droplet and in a micrometer-sized droplet. For the first time DLS signals for droplets of picolitre volume, levitated in an electrodynamic quadrupole trap, were obtained. It is shown that the correlation analysis of light scattered from a micro-droplet allows monitoring the changes of its internal structure, as well as its motions: trap-constricted Brownian motions and random rotations.

关键词： dynamic light scattering auto-correlation function droplets silica nanoparticles electrodynamic trap

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A Vice Peaks Restraint Algorithm with Orthogonal Subcarrier for AltBOC Signal 7

A Vice Peaks Restraint Algorithm with Orthogonal Subcarrier ...

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7th IEEE International Conference on Software Engineering and Service Science (ICSESS)

作者： Liu, Fang Zhang, Xinxin Shenyang Ligong Univ Sch Informat Sci & Engn Shenyang Peoples R China

ISBN: (纸本)9781467399043

With the continuous development of satellite navigation technology, on the basis of the original BOC signal that the AltBOC signal is proposed, which is applied in Galileo system and Compass system. Yet, inaccurate acquisition problem is also caused by the multi-peaks characteristic of AltBOC signal auto-correlation function. And the inter-modulation components and the plural form of subcarrier modulation mechanism are used in the AltBOC signal, which is extremely complex. Aiming at these problems, and considering the unsuitable problem of the traditional algorithms, the vice peaks restraint algorithm with orthogonal subcarrier is proposed. In this proposed algorithm, the square operation of the auto-correlation function and orthogonal correlation function for AltBOC signal is established to restrain the vice peaks. The simulation results show that this new algorithm is feasibility, and it has better anti-noise performance, which can provide theoretical basis for GNSS receiver.

关键词： alternate binary offset carrier auto-correlation function vice peaks restraint orthogonal subcarrier acquisition

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Effects of implantation energy and annealing temperature on the structural evolution of Ge⁺-implanted amorphous Si

Effects of implantation energy and annealing temperature on ...

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15th International Conference on Ion Implantation Technology

作者： He, JH Lin, HH Wu, WW Chen, LJ Natl Tsing Hua Univ Dept Mat Sci & Engn Hsinchu 300 Taiwan

High-resolution transmission electron microscopy in conjunction with autocorrelation function analysis have been applied to investigate the evolution of structural order in Ge+-preamorphized silicon layers. (001)Si wafers were preamorphized with 5 and 10 keV Ge+ to a dose of 5 x 10(15) ions/cm(2). A higher density of embedded nanocrystallites was found to be present in as-implanted amorphous Si layer for 10 keV Ge+ than that for 5 keV Ge+. The densities of embedded nanocrystallites in Ge+-preamorphized Si layer with 5 and 10 keV Ge+ were found to diminish with annealing temperature first then increase. The effects of ion-implantation energy and annealing temperature on the structural evolution in Ge+-implanted amorphous Si are discussed in terms of ion-beam induced annealing and free energy change of the system. The depth dependence on the density of embedded nanocrystallites is attributed to the nonuniform distribution of Ge atoms. (c) 2005 Elsevier B.V. All rights reserved.

关键词： implantation preamorphization TEM auto-correlation function nanocrystallite implantation energy

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Performance comparison of seizure detection methods using EEG of newborns for implementation of a DSP

Performance comparison of seizure detection methods using EE...

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IEEE International Conference on Acoustics, Speech, and Signal Processing

作者： Mesbah, M Boashash, B Queensland Univ Technol Signal Proc Res Ctr Brisbane Qld 4001 Australia

ISBN: (纸本)0780374029

This paper deals with the problem of seizure detection in newborns using the EEG signal. The performance of three techniques for seizure detection is investigated. The technique of Roessgen is model based and uses parameter estimation for detection. The two other methods are non-parametric. The technique of Gotman uses frequency analysis to determine the changes in the dominant peak of the frequency spectrum of short epochs of EEG data. The technique of Liu performs analysis in the time domain and is based on the auto-correlation function of short epochs of EEG data. This paper discusses the underlying methodology of the different techniques and presents a comparison of their performance on simulated EEG signal with the aim of considering the best for a possible implementation within a DSP system for automatic seizure detection. The obtained results show that Gotman's method outperforms the two other methods in terms of good detection, the missing detection, and the false alarm rates.

关键词： electroencephalography medical signal processing signal detection parameter estimation spectral analysis time-domain analysis correlation methods paediatrics performance comparison seizure detection methods newborns Roessgen model based technique parameter estimation nonparametric methods frequency spectrum frequency analysis Gotman technique Liu technique time domain analysis DSP subsystem EEG signal auto-correlation function DSP system automatic seizure detection good detection missing detection false alarm rates

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Response synchronization in the visual cortex

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Current Opinion in Neurobiology 1993年第4期3卷 586-594页

作者： Aertsen, Ad Arndt, Martin Institut für Neuroinformatik Ruhr Universität D-44780 Bochum Universitätsstrasse 150 Germany

Recently, the classic idea of a 'relational' code in the brain received new impetus from the observation of stimulus-dependent synchronizations in the visual cortex. Work over the past two years has focused on documenting the functional dependencies of such synchronizations. We review and classify the experimental findings with respect to separate spatial and temporal schemes. Thus, we distinguish between different signal classes (spikes, continuous signals), and different types of time-locking to the stimulus. These various classes of synchronization phenomena are discussed with regard to their properties, the underlying mechanisms and their possible relevance for visual processing. © 1993.

关键词： ACF auto-correlation function ACH auto-correlation histogram CCF cross-correlation function CCH cross-correlation histogram EEG electroencephalogram IT inferior temporal cortex LFP local field potential MT medial temporal area MUA multi-unit activity PSTH post-stimulus time histogram RF receptive field VEP visual evoked potential

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Dynamic speckle-interferometer for intracellular processes analyses at high optical magnification 2

Dynamic speckle-interferometer for intracellular processes a...

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Conference on Optical Methods for Inspection, Characterization, and Imaging of Biomaterials II

作者： Baharev, A. A. Vladimirov, A. P. Malygin, A. S. Mikhailova, Y. A. Novoselova, I. A. Yakin, D. I. Druzhinin, A. V. Res Inst Virus Infect Lab Cell Cultures Ekaterinburg 620030 Russia Ural Fed Univ Inst Engn Phys Dept Phys Control Methods & Devices Ekaterinburg 620002 Russia Res Inst Virus Infect Ekaterinburg 620030 Russia Ural Fed Univ Inst Engn Phys Dept Expt Phys Ekaterinburg 620002 Russia Inst Virus Infect Senior Lab Res Ekaterinburg 620030 Russia Inst Met Phys Ekaterinburg 620049 Russia

ISBN: (纸本)9781628416893

At present work dynamic of biospeckles is used for studying processes occurring in cells which arranged in the one layer. The basis of many diseases is changes in the structural and functional properties of the molecular cells components as caused by the influence of external factors and internal functional disorders. Purpose of work is approbation of speckle-interferometer designed for the analysis of cellular metabolism in individual cells. As a parameter, characterizing the metabolic activity of cells used the value of the correlation coefficient (eta) of optical signals proportional to the radiation intensity I, recorded at two points in time t. At 320x magnification for the cell diameter of 20 microns value eta can be determined in the area size of 6 microns.

关键词： Speckle interferometry cell intracellular processes cells activity metabolism auto-correlation function radiation intensity laser cells cultures human diseases

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Efficient real-time correlator for LS sequences

Efficient real-time correlator for LS sequences

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IEEE International Symposium on Industrial Electronics

作者： Perez, M. C. Urena, J. Hernandez, A. Jimenez, A. Marnane, W. R. Alvarez, F. Univ Alcala de Henares Dept Elect Alcala De Henares Spain Natl Univ Ireland Univ Coll Cork Dept Elect & Elect Engn Cork Ireland Univ Extremadura Dept Elect & Elect Engn E-06071 Badajoz Caceres Spain

ISBN: (纸本)9781424407545

The cross-correlation function and the side-lobes of the auto-correlation function of LS codes are zero in a certain vicinity of the zero shift. Therefore, the effects of the Inter-Symbol-Interference and Multiple-Access-Interference that appears in CDMA and multi-sensor systems are mitigated. Conventionally, the detection of these sequences has been achieved by means of straight-forward matched-filter correlators. In this paper, a new correlator which significantly reduces the total number of operations to be performed is proposed, allowing real-time operation.

关键词： code division multiple access codes correlation methods sensor fusion CDMA auto-correlation function cross-correlation function inter-symbol-interference loosely synchronized codes loosely synchronized sequences multiple-access-interference multisensor s

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Cornea curvature measurement using single shot C-scan OCT

Cornea curvature measurement using single shot C-scan OCT

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Conference Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine XI

作者： Plesea, Lucian Gomez, Marta Podoleanu, Adrian Gh. Univ Kent Sch Phys Sci Appl Opt Grp Canterbury Kent England

ISBN: (纸本)9780819465429

A novel method is presented for the evaluation of object shapes. The method has applicability in the measurement of the cornea curvature. An en-face OCT system using a multiple delay element in the reference path of the interferometer is proposed. This method allows detection of the polar variations of the cornea curvature from a single en-face OCT image. Inspection of multiple contours in the en-face OCT image can also be used to estimate the instantaneous axial position of the eye.

关键词： optical coherence tomography en-face OCT C-scan auto-correlation function depth measurement cornea curvature

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Orthogonal Expansion Method of Random Processes for Fluctuating Pressure of Water Flow

Orthogonal Expansion Method of Random Processes for Fluctuat...

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4th International Conference on Applied Mechanics and Mechanical Engineering (ICAMME 2013)

作者： Ye, Enli Zhou, Yihong Wuhan Univ State Key Lab Water Resources & Hydropower Engn Wuhan 430072 Peoples R China

ISBN: (纸本)9783037859230

Combining with its auto-correlation function, the stochastic process of water flow's fluctuating pressure is decomposed on the trigonometric bases by employing an expansion method based on normalized orthogonal bases which is prescribed, and thus establish an incentive model for the random dynamic response analysis of structures vibrated by water flow's fluctuating pressure. By using the model, main probabilistic characters of the flow's stochastic process are captured with only a few random variables, and therefore laid the foundation for further random response and reliability analysis from the point of probability density evolution. By using it in an instance, the validity of the model is tested from the aspect of second order statistics such as sampling ensemble power spectrum and sample mean square error. The effects of simulation duration and expansion numbers needed on the simulation's efficiency and accuracy are also discussed.

关键词： Fluctuating pressure of water flow Stochastic processes Orthogonal expansion Normalized orthogonal bases auto-correlation function

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A Chaos Based Partial Image Encryption Scheme 2

A Chaos Based Partial Image Encryption Scheme

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2nd International Conference on Business and Information Management (ICBIM)

作者： Som, Sukalyan Kotal, Atanu Mitra, Abhijit Palit, Sarbani Chaudhuri, B. B. Barrackpore Rastraguru Surendranath Coll Dept CS Kolkata 120 W Bengal India Techno India Coll Technol Dept CSE Kolkata 156 W Bengal India BACET Jamshedpur Dept ECE Jharkhand 832304 India Indian Stat Inst CVPR Unit Kolkata 108 W Bengal India

ISBN: (纸本)9781479932641

Partial encryption of images can be considered to be better than the existing image encryption techniques in the application areas where computational overhead is the main criterion. In this communication, a chaos based symmetric key partial encryption of gray level images has been proposed. In the proposed algorithm, the plain images, after decomposing them to bitplanes, are first classified into different categories. Next, a threshold based on the autocorrelation of blocks of different bitplanes is used to identify the significant and insignificant bit planes. Following this, the correlated bit planes of an image are encrypted with key stream sequences generated by a chaos based pseudo random binary number generator. The experimental results depict that the proposed algorithm can successfully encrypt and decrypt gray level images with secret keys. The simulation analysis also exhibits that the proposed method is loss-less, secure and efficient in terms of several statistical tests, key sensitivity test, information entropy test and encryption quality tests. From the results it is observed that the new approach is able to hide the residual intelligence with lesser amount of time than that require for encrypting the entire image.

关键词： auto-correlation function Bitplane Chaos Gray level image Mean square error Partial image encryption Peak signal to noise ratio Pseudo noise sequence

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