On the statistical characteristics of log-compressed Rayleigh signals: theoretical formulation and experimental results

1993 ◽  
Author(s):  
D. Kaplan ◽  
Qinglin Ma Qinglin Ma
Keyword(s):  
Experimental Results ◽  
Statistical Characteristics ◽  
Theoretical Formulation

FINITELY SUBSEQUENTIAL TRANSDUCERS

2003 ◽  
Vol 14 (06) ◽  
pp. 983-994 ◽  
Author(s):  
CYRIL ALLAUZEN ◽  
MEHRYAR MOHRI
Keyword(s):  
Speech Recognition ◽  
Finite Number ◽  
Efficient Algorithm ◽  
Experimental Results ◽  
Theoretical Formulation ◽  
Large Vocabulary ◽  
Finite State Transducers ◽  
Finite State ◽  
Large Vocabulary Speech Recognition

Finitely subsequential transducers are efficient finite-state transducers with a finite number of final outputs and are used in a variety of applications. Not all transducers admit equivalent finitely subsequential transducers however. We briefly describe an existing generalized determinization algorithm for finitely subsequential transducers and give the first characterization of finitely subsequentiable transducers, transducers that admit equivalent finitely subsequential transducers. Our characterization shows the existence of an efficient algorithm for testing finite subsequentiability. We have fully implemented the generalized determinization algorithm and the algorithm for testing finite subsequentiability. We report experimental results showing that these algorithms are practical in large-vocabulary speech recognition applications. The theoretical formulation of our results is the equivalence of the following three properties for finite-state transducers: determinizability in the sense of the generalized algorithm, finite subsequentiability, and the twins property.

Image Fusion Method Based on Universal Hidden Markov Tree Model in the Contourlet Domain

2013 ◽  
Vol 684 ◽  
pp. 491-494
Author(s):  
Xi Cai ◽  
Guang Han ◽  
Jin Kuan Wang
Keyword(s):  
Image Fusion ◽  
Hidden Markov ◽  
Visual Quality ◽  
Experimental Results ◽  
Statistical Characteristics ◽  
Fusion Method ◽  
High State ◽  
Tree Model ◽  
Markov Tree ◽  
Image Fusion Method

Considering the statistical characteristics of contourlet coefficients of images, we propose an image fusion method based on the universal contourlet hidden Markov tree (uHMT) model. A salience measure and a match measure are presented according to the probability of a contourlet coefficient belonging to the high state of the uHMT model which needs no training. Experimental results prove the effectiveness of our method in the field of visual quality and objective evaluations.

Research on Fingerprint Image Segmentation

2012 ◽  
Vol 532-533 ◽  
pp. 697-701
Author(s):  
Jun Tao Xue ◽  
Hong Wei Li
Keyword(s):  
Image Segmentation ◽  
Experimental Results ◽  
Statistical Characteristics ◽  
Orientation Field ◽  
Fingerprint Image ◽  
Field Information

As part of fingerprint image pre-processing, fingerprint image segmentation plays an irreplaceable role. This paper proposes a method based on the orientation field information combined with statistical characteristics of gray in order to realize the second segmentation of fingerprint image. Various experimental results show that the method proposed in this paper improves the effect of segmentation.

A Steganalysis Method for 2D Engineering Graphics Based on the Statistic of Geometric Features

2011 ◽  
Vol 3 (2) ◽  
pp. 35-40
Author(s):  
Fei Peng ◽  
Honglin Li
Keyword(s):  
Experimental Results ◽  
Statistical Characteristics ◽  
Geometric Features ◽  
Hidden Information ◽  
Engineering Graphics ◽  
Detection Model ◽  
Straight Line ◽  
Steganalysis Method

Aiming at hiding information in 2D engineering graphics based on geometric features, a steganalysis method is proposed in this paper. First, the authors obtained the number of 2D engineering graphics’ strictly vertical and horizontal lines and identify the number of horizontal and vertical lines which are deviated from the straight line within a certain range. Subsequently, the authors selected the ratio between the deviated lines and the normal lines as the statistical characteristics. Finally, a detection model was constructed based on the hypothesis. Experimental results show that the algorithm can detect hidden information in the 2D engineering graphics effectively.

The Role of Interstitial Fluid Pressurization and Surface Porosities on the Boundary Friction of Articular Cartilage

1998 ◽  
Vol 120 (2) ◽  
pp. 241-248 ◽  
Author(s):  
G. A. Ateshian ◽  
Huiqun Wang ◽  
W. M. Lai
Keyword(s):  
Articular Cartilage ◽  
Friction Coefficient ◽  
Interstitial Fluid ◽  
Mathematical Formulation ◽  
Friction Model ◽  
Experimental Results ◽  
Boundary Friction ◽  
Confined Compression ◽  
Theoretical Formulation ◽  
Fluid Pressurization

Articular cartilage is the remarkable bearing material of diarthrodial joints. Experimental measurements of its friction coefficient under various configurations have demonstrated that it is load-dependent, velocity-dependent, and time-dependent, and it can vary from values as low as 0.002 to as high as 0.3 or greater. Yet, many studies have suggested that these frictional properties are not dependent upon the viscosity of synovial fluid. In this paper, a theoretical formulation of a boundary friction model for articular cartilage is described and verified directly against experimental results in the configuration of confined compression stress-relaxation. The mathematical formulation of the friction model can potentially explain many of the experimentally observed frictional responses in relation to the pressurization of the interstitial fluid inside cartilage during joint loading, and the equilibrium friction coefficient which prevails in the absence of such pressurization. In this proposed model, it is also hypothesized that surface porosities play a role in the regulation of the frictional response of cartilage. The good agreement between theoretical predictions and experimental results of this study provide support for the proposed boundary friction formulation.

scholarly journals Compressive behavior of cylindrical rubber buffer confined with fiber reinforced polymer

2018 ◽  
Vol 39 (3) ◽  
pp. 470-484
Author(s):  
Shengshan Pan ◽  
Muzhou Zhao ◽  
Bassem Andrawes ◽  
Hang Zhao ◽  
Lian Li
Keyword(s):  
Lateral Displacement ◽  
Element Model ◽  
Experimental Results ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Theoretical Formulation ◽  
Compressive Stiffness ◽  
Strain Energy Density Function ◽  
Reinforced Polymer ◽  
The Impact

This paper presents a new composite buffer for mitigating the lateral displacement of structures under seismic loading. The buffer consists of a cylindrical rubber wrapped with fiber reinforced polymer composite. The uniaxial compressive stiffness of the buffer can be controlled by varying either the number of fiber reinforced polymer layers or the wrapping scheme of fiber reinforced polymer. First, a test program is carried out to investigate the impact of various parameters on the compressive stiffness and strength of the new buffer including thickness of fiber reinforced polymer, wrapping scheme, and method of wrapping of fiber reinforced polymer. Next, a theoretical formulation is derived to describe the constitutive behavior of fiber reinforced polymer wrapped rubber under uniaxial compression using strain energy density function of the Yeoh N-order polynomial model. Finally, a finite element model is developed to analyze the new composite buffer and the numerical results are validated using the experimental results. The results of the study show that the Yeoh model is able to simulate the behavior of rubber under compression. The new composite buffer exhibits significantly higher stiffness and strength than that of pure rubber. Wrapping scheme plays an important role in defining the mechanical behavior of the buffer. The study also shows good agreement between the numerical simulation and the experimental results.

Distinguishing Computer Graphics from Natural Images Based on Statistical Characteristics

2013 ◽  
Vol 380-384 ◽  
pp. 1306-1309
Author(s):  
Sen Feng Tong ◽  
Yu Hao Yang ◽  
Yong Jie Xie
Keyword(s):  
Computer Graphics ◽  
Discrete Cosine Transform ◽  
Recognition Rate ◽  
Experimental Results ◽  
Natural Images ◽  
Statistical Characteristics ◽  
Transform Domain ◽  
Significant Digit ◽  
Detection Model ◽  
Discrimination Method

In this paper, we propose a new discrimination method using image statistical characteristics is proposed which is designed to distinguish natural images from photorealistic computer graphics. Using Benford model as statistical basis, we conclude statistical properties of the MSD (most significant digit) of AC (Alternating Current) coefficients in DCT (Discrete Cosine Transform) domain of natural images and computer graphics, and then we constructed the detection model of the proposed algorithm. Experimental results show that this method can identify natural images and computer graphics effectively, compared with the existing algorithms this method has a higher recognition rate, which comes to 95.22%.

Distribution of the circulation times in a batch mixed by two impellers on a common shaft

1989 ◽  
Vol 54 (3) ◽  
pp. 633-644
Author(s):  
Vladimír Kudrna ◽  
Václav Koza ◽  
Jiří Hájek
Keyword(s):  
Theoretical Model ◽  
Tracer Particle ◽  
Visual Observation ◽  
Expected Value ◽  
Experimental Results ◽  
Statistical Characteristics ◽  
Frequency Function ◽  
Simple Method ◽  
Primary Processing ◽  
Mixed Batch

The paper has been devoted to the study of the circulation times in a batch mixed by several impellers on a common shaft. A simple method has been used to carry out the measurements based on visual observation of the motion of a tracer particle in the mixed batch. Individual passages of the tracer particle through the check surface have been signalized to a computer performing the primary processing of data, calculation of the basic statistical characteristics (expected value and variance) and the frequency function of the circulation times of the tracer particle. A model developed earlier for a vessel mixed by a single impeller has been used to interpret the data. This theoretical model has been compared with experimental results.

COMPARISON OF PRISM-BASED OPTICAL PROBES FOR LIQUID MONITORING

2010 ◽  
Vol 24 (11) ◽  
pp. 1111-1126
Author(s):  
H. GOLNABI ◽  
M. RAZANI
Keyword(s):  
Incident Angle ◽  
Experimental Results ◽  
Beam Divergence ◽  
Experimental Measurements ◽  
Optical Probes ◽  
Theoretical Formulation ◽  
Effective Application ◽  
Theoretical Investigations ◽  
Emergent Intensity ◽  
Good Agreement

In this article, two possible applications of prism-based probes for liquid-switching, level-sensing, and as a refractometer are described. Theoretical formulation is developed for the emergent intensity for each system and possible range of operation for each system is reported. By comparing the theoretical investigations, some hints are given in optimum usage of prism in each case. Variation of the beam divergence, incident angle, and prism glass index are major parameters that are considered in this investigation. The obtained results are compared with some available experimental results and practical points concerning the effective application of each geometry is reported. Theoretical expressions developed here are in good agreement with the experimental measurements.

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