Performance of Biometrics Recognition System Using Multiple Scales Analysis

Transverse free dynamics of a beam-like nanostructure with axial load is investigated. The effects of a small size at nano-scale unavailable in classical mechanics are presented. Explicit solutions for natural frequency, vibration mode and transverse displacement are obtained by separation of variables and multiple scales analysis. Results by two methods are in close agreement.

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Nonlinear Stability of Thermoelastic Sliding Contact

Journal of Applied Mechanics ◽

10.1115/1.2423034 ◽

2005 ◽

Vol 74 (3) ◽

pp. 595-598

Author(s):

Jason D. Miller ◽

D. Dane Quinn

Keyword(s):

Multiple Scales ◽

Dynamical Behavior ◽

Stable State ◽

Nonlinear Behavior ◽

Sliding Contact ◽

Stability Criteria ◽

Multiple Scales Analysis ◽

Two Equilibria

A model for sliding contact of a thermoelastic rod is considered and is subjected to a multiple scales analysis to uncover its nonlinear behavior near a neutrally stable state. The analysis reveals a combination of the contact resistance and frictional intensity that describes the generic unfolding of this critical state and its associated bifurcations. In particular, the system can describe how two equilibria coalesce in a saddle-node bifurcation and generalizes stability criteria that have been presented previously in the literature for this model. Moreover, this analysis describes the role of the initial deformation of the rod on its long-term dynamical behavior.

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Mathematical models and meanings by school and university students in a modelling task

Avances de Investigación en Educación Matemática ◽

10.35763/aiem.v0i17.308 ◽

2020 ◽

pp. 67-83

Author(s):

Susana Carreira ◽

Ana Margarida Baioa ◽

Lourdes Maria Werle de Almeida

Keyword(s):

University Students ◽

Recognition System ◽

9Th Grade ◽

Qualitative Nature ◽

Hand Biometrics ◽

Biometrics Recognition ◽

The Relationship ◽

Modelling Process ◽

Modelling Task

This study involves two classes from different educational levels, namely 9th grade and university. Students in both contexts were given a modelling task that required the development of a hand biometrics recognition system, during which they performed experimentation and simulation. As aims of the study, we look for distinctions and commonalities between the models developed in the two classes and seek to know how simulation and experimentation influence students’ production of meaning. The theoretical framework comprises the relationship between the modelling process and the prototyping process and adopts Peirce’s pragmatic perspective on meaning. The research is of a qualitative nature, assuming the characteristics of a case study. The results reveal many commonalities between the modelling in the two contexts. Moreover, experimentation and simulation were relevant elements for the production of meaning by the students, which is endorsed by a pragmatic perspective on meaning.

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A Study on the Development of Embedded Serial Multi-modal Biometrics Recognition System

Journal of Korean institute of intelligent systems ◽

10.5391/jkiis.2006.16.1.049 ◽

2006 ◽

Vol 16 (1) ◽

pp. 49-54 ◽

Cited By ~ 1

Author(s):

Joeng-Hoon Kim ◽

Soon-Ryang Kwon

Keyword(s):

Recognition System ◽

Biometrics Recognition

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Enhancing Fixed Size Palmprint Region of Interest (ROI) Extraction Algorithm for Personal Identification

International Journal of Recent Technology and Engineering - 2 ◽

10.35940/ijrte.d5177.118419 ◽

2019 ◽

Vol 8 (4) ◽

pp. 6918-6923

Keyword(s):

Region Of Interest ◽

Recognition System ◽

Small Region ◽

Personal Identification ◽

Fixed Size ◽

Extraction Area ◽

Extraction Region ◽

Extraction Algorithm ◽

Roi Extraction ◽

Biometrics Recognition

Identification and verification are the fundamental process in biometrics recognition system. Research indicates that palmprint, as one of the biometric recognitions system is commonly used for human identification. It is because there are many features and information contained inside the palmprint that can be used in the identification process. However, only a small region of the palmprint can be extracted using the existing palmprint region of interest (ROI) extraction algorithms. This has become a problem for identification systems due to negligible and loss of important features which are located outside the ROI. Hence, it is a necessity to improve the palmprint ROI extraction algorithm whereby bigger palmprint ROI can be extracted using this algorithm. Therefore, a larger fixed size extraction algorithm for palmprint ROI is proposed where the extraction region is larger so that more important identification features can be captured inside these ROIs. The performance between proposed and existing extraction algorithms are tested based on two characteristics which are the palmprint ROI extraction area and the comparison of feature creases extracted in a palmprint ROI. The results show that 300x300 fixed size ROI is able to capture 13 out of 14 creases attributes for palmprint identification. This implies that the proposed extraction algorithm shows a promising method of extraction as compared to the existing algorithms.

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A Multiple-Scales Analysis of Nonlinear, Localized Modes in a Cyclic Periodic System

Journal of Applied Mechanics ◽

10.1115/1.2900806 ◽

1993 ◽

Vol 60 (2) ◽

pp. 388-397 ◽

Cited By ~ 46

Author(s):

A. Vakakis ◽

T. Nayfeh ◽

M. King

Keyword(s):

Vibration Isolation ◽

Multiple Scales ◽

Algebraic Equations ◽

Localized Modes ◽

Mode Localization ◽

Nonlinear Mode ◽

Weakly Coupled ◽

Passive Vibration Isolation ◽

Coupling Stiffness ◽

Multiple Scales Analysis

In this work the nonlinear localized modes of an n-degree-of-freedom (DOF) nonlinear cyclic system are examined by the averaging method of multiple scales. The set of nonlinear algebraic equations describing the localized modes is derived and is subsequently solved for systems with various numbers of DOF. It is shown that nonlinear localized modes exist only for small values of the ratio (k/μ), where k is the linear coupling stiffness and μ is the coefficient of the grounding stiffness nonlinearity. As (k/μ) increases the branches of localized modes become nonlocalized and either bifurcate from “extended” antisymmetric modes in inverse, “multiple” Hamiltonian pitchfork bifurcations (for systems with even-DOF), or reach certain limiting values for large values of(k/μ) (for systems with odd-DOF). Motion confinement due to nonlinear mode localization is demonstrated by examining the responses of weakly coupled, perfectly periodic cyclic systems caused by external impulses. Finally, the implications of nonlinear mode localization on the active or passive vibration isolation of such structures are discussed.

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Parametric Vibrations in Discs: Point-Wise and Distributed Loads, Including Rotating Friction

Volume 3A: 15th Biennial Conference on Mechanical Vibration and Noise — Vibration of Nonlinear, Random, and Time-Varying Systems ◽

10.1115/detc1995-0359 ◽

1995 ◽

Author(s):

H. Ouyang ◽

S. N. Chan ◽

J. E. Mottershead ◽

M. I. Friswell ◽

M. P. Cartmell

Keyword(s):

Multiple Scales ◽

Equations Of Motion ◽

Transverse Load ◽

Transverse Mass ◽

Follower Load ◽

Parametric Resonances ◽

Spring System ◽

Multiple Scales Analysis ◽

Mass Spring ◽

Rotating Load

Abstract This paper is concerned with the parametric resonances in a stationary annular disc when excited by a rotating load system. Two forms of the load system are considered. In the first, the load consists of a discrete transverse mass-spring-damper system and a frictional follower load. Secondly, a distributed mass-spring system (without friction) is studied. In both cases the transverse load is rotated at a uniform speed around the disc. Equations of motion are developed for the two cases, and the results of a multiple scales analysis are presented. The disc is found to exhibit many parametric resonances at subcritical speeds when friction is present.

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