scholarly journals Ship wake region detection by using multi-feature recombination and area-based morphological analysis in ATI-SAR systems

2019 ◽  
Vol 2019 (21) ◽  
pp. 7397-7402
Author(s):  
Min Tian ◽  
Zhiwei Yang ◽  
Zhijie Mao ◽  
Guisheng Liao
Keyword(s):  
Morphological Analysis ◽  
Wake Region ◽  
Ship Wake ◽  
Region Detection

Ship Wake Structure on the Finite Sea Depth in the Presence of Wind Waves

2011 ◽  
Author(s):  
Ray-Yeng Yang ◽  
Ming-Chung Fang ◽  
Igor V. Shugan
Keyword(s):  
Surface Waves ◽  
Froude Number ◽  
Wind Waves ◽  
Wave Structure ◽  
Stationary Wave ◽  
Ship Motion ◽  
Wake Region ◽  
Wake Structure ◽  
Ship Wake ◽  
Kinematics Model

A kinematics model of the ship wake in the presence of surface waves, generated by wind is presented. It is found that the stationary wave structure behind the ship covered a wedge region with the 16.9° half an angle at the top of the wake and only divergent waves are present in a ship wake for co propagating wind waves. Wind waves field directed at some nonzero angle to the ship motion can cause essential asymmetry of the wake and compressing of its windward half. The extension of Whitham-Lighthill kinematics theory of ship wake for the intermediate sea depth is also presented. The ship wake structure essentially depends from the Froude (Fr) number based on the value of the sea depth and ship velocity. For Froude number less than unit both longitudinal and cross waves are presented in the wake region and Kelvin wake angle increased with Fr. For Fr>1 wake angle decreased with Froude number and finally only divergent waves directed almost normally to the ship track are presented in the very narrow ship wake.

Kelvin Ship Wake in the Wind Waves Field and on the Finite Sea Depth

2011 ◽  
Vol 27 (1) ◽  
pp. 71-77 ◽  
Author(s):  
M.-C. Fang ◽  
R.-Y. Yang ◽  
I. V. Shugan
Keyword(s):  
Surface Waves ◽  
Froude Number ◽  
Wind Waves ◽  
Wave Structure ◽  
Stationary Wave ◽  
Ship Motion ◽  
Wake Region ◽  
Wake Structure ◽  
Ship Wake ◽  
Kinematics Model

ABSTRACTA kinematics model of the ship wake in the presence of surface waves, generated by wind is presented. It was found that the stationary wave structure behind the ship covered a wedge region with the 16.9° half an angle at the top of the wake and only divergent waves are present in a ship wake for co propagating wind waves. Wind waves field directed at some nonzero angle to the ship motion can cause essential asymmetry of the wake and compressing of its windward half. The extension of Whitham-Lighthill kinematics theory of ship wake for the intermediate sea depth is also presented. The ship wake structure essentially depends from the Froude (Fr) number based on the value of the sea depth and ship velocity. For Froude number less than unit both longitudinal and cross waves are presented in the wake region and Kelvin wake angle increased with Fr. For Fr > 1 wake angle decreased with Froude number and finally only divergent waves are presented in the very narrow ship wake.

Structural and Chemical Studies of Pathological Fibers in Human Neurofibrillary Degeneration

1985 ◽  
Vol 43 ◽  
pp. 726-729
Author(s):  
K.S. Kosik ◽  
L.K. Duffy ◽  
S. Bakalis ◽  
C. Abraham ◽  
D.J. Selkoe
Keyword(s):  
Monoclonal Antibodies ◽  
Alzheimer Disease ◽  
Human Brain ◽  
Neurofibrillary Tangles ◽  
Morphological Analysis ◽  
High Specificity ◽  
Cytoskeletal Proteins ◽  
Neuritic Plaque ◽  
Protein Chemistry ◽  
Chemical Studies

The major structural lesions of the human brain during aging and in Alzheimer disease (AD) are the neurofibrillary tangles (NFT) and the senile (neuritic) plaque. Although these fibrous alterations have been recognized by light microscopists for almost a century, detailed biochemical and morphological analysis of the lesions has been undertaken only recently. Because the intraneuronal deposits in the NFT and the plaque neurites and the extraneuronal amyloid cores of the plaques have a filamentous ultrastructure, the neuronal cytoskeleton has played a prominent role in most pathogenetic hypotheses.The approach of our laboratory toward elucidating the origin of plaques and tangles in AD has been two-fold: the use of analytical protein chemistry to purify and then characterize the pathological fibers comprising the tangles and plaques, and the use of certain monoclonal antibodies to neuronal cytoskeletal proteins that, despite high specificity, cross-react with NFT and thus implicate epitopes of these proteins as constituents of the tangles.

Morphological analysis of selective destruction of pancreatic beta-cells by cytotoxic T lymphocytes in NOD mice

Diabetes ◽  
1991 ◽  
Vol 40 (9) ◽  
pp. 1210-1217 ◽  
Author(s):  
M. Hayakawa ◽  
K. Yokono ◽  
M. Nagata ◽  
N. Hatamori ◽  
W. Ogawa ◽  
...  
Keyword(s):  
T Lymphocytes ◽  
Beta Cells ◽  
Cytotoxic T Lymphocytes ◽  
Pancreatic Beta Cells ◽  
Morphological Analysis ◽  
Nod Mice ◽  
Selective Destruction

Systemic mastocytosis: clinical and morphological analysis five patients with a rare disease

2019 ◽  
Vol XIV (2) ◽  
Author(s):  
I.L. Plaksa ◽  
S.S. Savin ◽  
E.M. Charlanova ◽  
V.M. Kravcova ◽  
B.V. Afanasiev
Keyword(s):  
Rare Disease ◽  
Morphological Analysis ◽  
Systemic Mastocytosis

Improving the Computational Cost for Copied Region Detection in Forensic Images

2016 ◽  
Vol 2 (1) ◽  
pp. 55
Author(s):  
Tu Huynh-Kha ◽  
Thuong Le-Tien ◽  
Synh Ha ◽  
Khoa Huynh-Van
Keyword(s):  
Wavelet Transform ◽  
Euclidean Distance ◽  
Research Work ◽  
Computational Cost ◽  
Correlation Coefficients ◽  
Zernike Moments ◽  
Computational Time ◽  
Discrete Wavelet ◽  
Feature Vectors ◽  
Region Detection

This research work develops a new method to detect the forgery in image by combining the Wavelet transform and modified Zernike Moments (MZMs) in which the features are defined from more pixels than in traditional Zernike Moments. The tested image is firstly converted to grayscale and applied one level Discrete Wavelet Transform (DWT) to reduce the size of image by a half in both sides. The approximation sub-band (LL), which is used for processing, is then divided into overlapping blocks and modified Zernike moments are calculated in each block as feature vectors. More pixels are considered, more sufficient features are extracted. Lexicographical sorting and correlation coefficients computation on feature vectors are next steps to find the similar blocks. The purpose of applying DWT to reduce the dimension of the image before using Zernike moments with updated coefficients is to improve the computational time and increase exactness in detection. Copied or duplicated parts will be detected as traces of copy-move forgery manipulation based on a threshold of correlation coefficients and confirmed exactly from the constraint of Euclidean distance. Comparisons results between proposed method and related ones prove the feasibility and efficiency of the proposed algorithm.

Sign in / Sign up

Export Citation Format

Share Document