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392 results on '"Wu, Shiqian"'

54. Analysis of vortex ring formation in the heart chamber by instantaneous vortex deviation based on convolutional neural network

Author

Yang Ke, Wu Shiqian, and Wong Kelvin K.L.

Subjects
Environmental sciences, GE1-350
Abstract

The formation of vortex rings during the left ventricle (LV) filling is an optimized mechanism for blood transport, and the vorticity is an important measure of a healthy heart and LV. There is a relationship between abnormal diastolic vortex structure and impaired LV, and hence vortex identification is vital for understanding the underlying physical mechanism of blood flow. However, due to lack of quantitative methods, defining, computing and mapping the left ventricular vortices has not been rigorously studied previously. In this paper, a novel method of vortex detection based on the convolutional neural network (CNN) is created, which enables determination of the boundary of vortex and integrates the local and global flow fields. We have used the CNN-based vortex identification and vector flow mapping (VFM) to quantify left ventricular vorticity. In the clinical application of our methodology to healthy subjects and uremic patients, we find differences in the strength and position of the vortices between healthy and patients with uremia cardiomyopathy. Our results can accurately indicate the role of vortex formation in intracardiac flow, and provide new insights into the blood flow within the heart structure.

Published
2021
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68. A New Color Image Enhancement Algorithm for Camera-Equipped Mobile Telephone

Author

Wang, Zhengyou, Xue, Quan, Chen, Guobin, Zeng, Weiming, Fang, Zhijun, Wu, Shiqian, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Carbonell, Jaime G., editor, Siekmann, Jörg, editor, Gabrys, Bogdan, editor, Howlett, Robert J., editor, and Jain, Lakhmi C., editor

Published
2006
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69. An Efficient Mobility Management Scheme for Hierarchical Mobile IPv6 Networks

Author

Wan, Zheng, Wang, Zhengyou, Fang, Zhijun, Zeng, Weiming, Wu, Shiqian, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Gavrilova, Marina L., editor, Gervasi, Osvaldo, editor, Kumar, Vipin, editor, Tan, C. J. Kenneth, editor, Taniar, David, editor, Laganá, Antonio, editor, Mun, Youngsong, editor, and Choo, Hyunseung, editor

Published
2006
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70. Fast PCA and LDA for JPEG Images

Author

Chen, Weilong, Er, Meng Joo, Wu, Shiqian, Kacprzyk, Janusz, editor, Kurzyński, Marek, editor, Puchała, Edward, editor, Woźniak, Michał, editor, and żołnierek, Andrzej, editor

Published
2005
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72. Evaluation of a Crossover Router Based QoS Mechanism in Fast Mobile IPv6 Networks

Author

Wan, Zheng, Wang, Zhengyou, Fang, Zhijun, Zeng, Weiming, Wu, Shiqian, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Ho, Yo-Sung, editor, and Kim, Hyoung-Joong, editor

Published
2005
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73. Fast discontinuous phase unwrapping based on orientation diagram transformation

Author

Deng Gaoxu, Liao Yucheng, WU Shiqian, and Chen Bin

Subjects
Discontinuity (linguistics), Transformation (function), Mean squared error, Orientation (computer vision), Conjugate gradient method, Diagram, Phase (waves), Structure tensor, Algorithm, Atomic and Molecular Physics, and Optics, Mathematics
Abstract

The phase discontinuity caused by the geometric mutation has always been a challenging problem in phase unwrapping. To solve this problem, a fast discontinuous phase unwrapping algorithm based on orientation and transformation was proposed. In the proposed algorithm, the structure tensor of the image was used to estimate the orientation of the wrapped phase diagram. The reliable weight coefficient diagram obtained from transformation and difference calculation of the orientation diagram was taken as the weight of the weighted least square method, and used the preprocessed conjugate gradient method to solve iteratively. This algorithm could quickly find the discontinuous regions, and performed a separate phase unwrapping in the discontinuous regions, which had good recognition and unwrapping effect. The principle and implementation steps of the algorithm were described in detail, and the algorithm was verified by simulation and experimental data. The experimental results show that the root mean square error of phase unwrapping is 0.36, which proves that this algorithm can quickly and accurately unwrap the discontinuous wrapped phase.

Published
2021

89. A novel method for measuring traffic load-induced settlement at different layers of embankment in highway

Author

Xiao Zheng, Wu Shiqian, Qian-qing Zhang, Wei Cui, and Yu-You Yang

Subjects
geography, geography.geographical_feature_category, Settlement (structural), Applied Mathematics, 020208 electrical & electronic engineering, 010401 analytical chemistry, 02 engineering and technology, Field tests, Condensed Matter Physics, 01 natural sciences, 0104 chemical sciences, 0202 electrical engineering, electronic engineering, information engineering, Traffic load, Geotechnical engineering, Monitoring methods, Electrical and Electronic Engineering, Connecting rod, Levee, Instrumentation, Highway engineering, Geology, Extensometer
Abstract

A large number of high embankments have been constructed in highway engineering with the fast development of highway. The measurement and treatment of traffic loading-induced settlement is a research focus in recent years. This paper focuses on the measurement of the layered settlement, induced by the traffic loading, in the embankment of highway. A novel method to measure the traffic loading-induced settlement at different depths in the embankment is proposed. The practical measurement equipment, including a multipoint extensometer, rigid base, settlement detecting plate, protector tube and connecting rod, is developed. The field tests were carried out in the filling and surcharge period to verify the stability and accuracy of measurement equipment. The test results indicate that the developed equipment and the presented installation method can be capable of measuring traffic-induced settlement at different depths in the embankment of the operating highway.

Published
2019

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