The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform
Dinggang Shen - One of the best experts on this subject based on the ideXlab platform.
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Simultaneous and consistent labeling of Longitudinal Dynamic developing cortical surfaces in infants.
Medical image analysis, 2014Co-Authors: Li Wang, Feng Shi, Weili Lin, Dinggang ShenAbstract:The human cerebral cortex develops extremely Dynamically in the first 2years of life. Accurate and consistent parcellation of Longitudinal Dynamic cortical surfaces during this critical stage is essential to understand the early development of cortical structure and function in both normal and high-risk infant brains. However, directly applying the existing methods developed for the cross-sectional studies often generates Longitudinally-inconsistent results, thus leading to inaccurate measurements of the cortex development. In this paper, we propose a new method for accurate, consistent, and simultaneous labeling of Longitudinal cortical surfaces in the serial infant brain MR images. The proposed method is explicitly formulated as a minimization problem with an energy function that includes a data fitting term, a spatial smoothness term, and a temporal consistency term. Specifically, inspired by multi-atlas based label fusion, the data fitting term is designed to integrate the contributions from multi-atlas surfaces adaptively, according to the similarities of their local cortical folding with that of the subject cortical surface. The spatial smoothness term is then designed to adaptively encourage label smoothness based on the local cortical folding geometries, i.e., allowing label discontinuity at sulcal bottoms (which often are the boundaries of cytoarchitecturally and functionally distinct regions). The temporal consistency term is to adaptively encourage the label consistency among the temporally-corresponding vertices, based on their similarity of local cortical folding. Finally, the entire energy function is efficiently minimized by a graph cuts method. The proposed method has been applied to the parcellation of Longitudinal cortical surfaces of 13 healthy infants, each with 6 serial MRI scans acquired at 0, 3, 6, 9, 12 and 18months of age. Qualitative and quantitative evaluations demonstrated both accuracy and Longitudinal consistency of the proposed method. By using our method, for the first time, we reveal several hitherto unseen properties of the Dynamic and regionally heterogeneous development of the cortical surface area in the first 18months of life.
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MICCAI (1) - Multi-atlas based simultaneous labeling of Longitudinal Dynamic cortical surfaces in infants.
Medical image computing and computer-assisted intervention : MICCAI ... International Conference on Medical Image Computing and Computer-Assisted Inte, 2013Co-Authors: Li Wang, Feng Shi, Weili Lin, Dinggang ShenAbstract:Accurate and consistent labeling of Longitudinal cortical surfaces is essential to understand the early Dynamic development of cortical structure and function in both normal and abnormal infant brains. In this paper, we propose a novel method for simultaneous, consistent, and unbiased labeling of Longitudinal Dynamic cortical surfaces in the infant brain MR images. The proposed method is formulated as minimization of an energy function, which includes the data fitting, spatial smoothness and temporal consistency terms. Specifically, in the spirit of multi-atlas based label fusion, the data fitting term is designed to integrate adaptive contributions from multi-atlas surfaces, according to the similarity of their local cortical folding with that of the subject surface. The spatial smoothness term is designed to adaptively encourage label smoothness based on the local folding geometries, i.e., also allowing label discontinuity at sulcal bottoms, where the cytoarchitecturally and functionally distinct cortical regions are often divided. The temporal consistency term is further designed to encourage the label consistency between temporal corresponding vertices with similar local cortical folding. Finally, the entire energy function is efficiently minimized by a graph cuts method. The proposed method has been successfully applied to the labeling of Longitudinal cortical surfaces of 13 infants, each with 6 serial images scanned from birth to 2 years of age. Both qualitative and quantitative evaluation results demonstrate the validity of the proposed method.
Li Wang - One of the best experts on this subject based on the ideXlab platform.
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Simultaneous and consistent labeling of Longitudinal Dynamic developing cortical surfaces in infants.
Medical image analysis, 2014Co-Authors: Li Wang, Feng Shi, Weili Lin, Dinggang ShenAbstract:The human cerebral cortex develops extremely Dynamically in the first 2years of life. Accurate and consistent parcellation of Longitudinal Dynamic cortical surfaces during this critical stage is essential to understand the early development of cortical structure and function in both normal and high-risk infant brains. However, directly applying the existing methods developed for the cross-sectional studies often generates Longitudinally-inconsistent results, thus leading to inaccurate measurements of the cortex development. In this paper, we propose a new method for accurate, consistent, and simultaneous labeling of Longitudinal cortical surfaces in the serial infant brain MR images. The proposed method is explicitly formulated as a minimization problem with an energy function that includes a data fitting term, a spatial smoothness term, and a temporal consistency term. Specifically, inspired by multi-atlas based label fusion, the data fitting term is designed to integrate the contributions from multi-atlas surfaces adaptively, according to the similarities of their local cortical folding with that of the subject cortical surface. The spatial smoothness term is then designed to adaptively encourage label smoothness based on the local cortical folding geometries, i.e., allowing label discontinuity at sulcal bottoms (which often are the boundaries of cytoarchitecturally and functionally distinct regions). The temporal consistency term is to adaptively encourage the label consistency among the temporally-corresponding vertices, based on their similarity of local cortical folding. Finally, the entire energy function is efficiently minimized by a graph cuts method. The proposed method has been applied to the parcellation of Longitudinal cortical surfaces of 13 healthy infants, each with 6 serial MRI scans acquired at 0, 3, 6, 9, 12 and 18months of age. Qualitative and quantitative evaluations demonstrated both accuracy and Longitudinal consistency of the proposed method. By using our method, for the first time, we reveal several hitherto unseen properties of the Dynamic and regionally heterogeneous development of the cortical surface area in the first 18months of life.
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MICCAI (1) - Multi-atlas based simultaneous labeling of Longitudinal Dynamic cortical surfaces in infants.
Medical image computing and computer-assisted intervention : MICCAI ... International Conference on Medical Image Computing and Computer-Assisted Inte, 2013Co-Authors: Li Wang, Feng Shi, Weili Lin, Dinggang ShenAbstract:Accurate and consistent labeling of Longitudinal cortical surfaces is essential to understand the early Dynamic development of cortical structure and function in both normal and abnormal infant brains. In this paper, we propose a novel method for simultaneous, consistent, and unbiased labeling of Longitudinal Dynamic cortical surfaces in the infant brain MR images. The proposed method is formulated as minimization of an energy function, which includes the data fitting, spatial smoothness and temporal consistency terms. Specifically, in the spirit of multi-atlas based label fusion, the data fitting term is designed to integrate adaptive contributions from multi-atlas surfaces, according to the similarity of their local cortical folding with that of the subject surface. The spatial smoothness term is designed to adaptively encourage label smoothness based on the local folding geometries, i.e., also allowing label discontinuity at sulcal bottoms, where the cytoarchitecturally and functionally distinct cortical regions are often divided. The temporal consistency term is further designed to encourage the label consistency between temporal corresponding vertices with similar local cortical folding. Finally, the entire energy function is efficiently minimized by a graph cuts method. The proposed method has been successfully applied to the labeling of Longitudinal cortical surfaces of 13 infants, each with 6 serial images scanned from birth to 2 years of age. Both qualitative and quantitative evaluation results demonstrate the validity of the proposed method.
Ying Chen - One of the best experts on this subject based on the ideXlab platform.
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effect of sulfate solution concentration on the deterioration mechanism and physical properties of concrete
Construction and Building Materials, 2019Co-Authors: Peng Liu, Ying ChenAbstract:Abstract Effects of sodium sulfate solution concentration and erosion age on axial compressive strength, sulfate ion distribution, Dynamic elastic modulus, electrochemical performance and load–displacement curves of concrete were investigated. Based on the chemical thermoDynamics theory, the internal relationship between sodium sulfate solution concentration and sulfate products was deduced. The porosity and pore distribution, phase composition, Nyquist spectrum, micro structure and morphology of concrete before and after sulfate attack were also analyzed by different testing instruments. The results indicate that the axial compressive strength and load–displacement curves of concrete first increase and then decrease with increasing sodium sulfate solution concentration. With increase of erosion age, the lower the strength grade of concrete is, the larger the reduction of axial compressive strength of concrete attacked by sulfate. The main products of sulfate attack are claviform ettringite and lamellar gypsum, which play double effects on performance of the concrete. The sulfate ion content in concrete surface increases with the increasing of sulfate solution concentration, and it also increases first and then decreases until to a certain value with depth. The transverse and Longitudinal Dynamic elastic moduli of concrete attacked by sulfate solution change with increasing of the sulfate solution concentration. The envelope curves of the waveform change of transverse and Longitudinal Dynamic elastic moduli of concrete can be represented as exponential function. The change of electric resistance of pore solution and charge-transfer resistance increases with sulfate solution concentration, which indicates the micro structure of concrete specimens are degraded by sulfate attacked.
Kuihua Wang - One of the best experts on this subject based on the ideXlab platform.
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Longitudinal Dynamic impedance of a static drill rooted nodular pile embedded in layered soil
Marine Georesources & Geotechnology, 2018Co-Authors: Li Zhenya, Kuihua Wang, Chin Jian LeoAbstract:AbstractThe static drill rooted nodular (SDRN) pile is a new type of precast pipe pile with equally spaced nodes distributed along the shaft and wrapped by the surrounding cemented soil. In this paper, the Longitudinal Dynamic response of the SDRN pile embedded in layered soil is investigated with respect to the complexity of the pile body structure and the pile-soil contact condition. First, the shear complex stiffness transfer model is used to simulate the radial inhomogeneity of the surrounding soil. Then, the governing equations of the pile-soil system subjected to Longitudinal Dynamic loading are established. The analytical solution for the Dynamic response at the pile head is obtained by means of the shear complex stiffness transfer method and the impedance function transfer method. The degenerate case of the present solution is compared with the published solution to verify its reliability, and the complex impedance of the SDRN pile is compared with that of the precast pipe pile and the bored pile....
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Longitudinal Dynamic response of pile in layered soil based on virtual soil pile model
Journal of Central South University, 2012Co-Authors: Kuihua Wang, Jian Leo ChinAbstract:Taking the effect of finite soil layers below pile end into account, the Longitudinal Dynamic response of pile undergoing Dynamic loading in layered soil was theoretically investigated. Firstly, finite soil layers below pile end are modeled as virtual soil pile whose cross-section area is the same as that of the pile and the soil layers surrounding the pile are described by the plane strain model. Then, by virtue of Laplace transform and impedance function transfer method, the analytical solution of Longitudinal Dynamic response at the pile head in frequency domain is yielded. Also, the semi-analytical solution in time domain undergoing half-cycle sine pulse at the pile head is obtained by means of inverse Laplace transform. Based on these solutions, a parametric study is conducted to analyze emphatically the effects of parameters of soil below pile end on velocity admittance and reflected wave signals at the pile head. Additionally, a comparison with other models with different supporting conditions from soil below pile end is performed to verify the model presented.
Jian Leo Chin - One of the best experts on this subject based on the ideXlab platform.
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Longitudinal Dynamic response of pile in layered soil based on virtual soil pile model
Journal of Central South University, 2012Co-Authors: Kuihua Wang, Jian Leo ChinAbstract:Taking the effect of finite soil layers below pile end into account, the Longitudinal Dynamic response of pile undergoing Dynamic loading in layered soil was theoretically investigated. Firstly, finite soil layers below pile end are modeled as virtual soil pile whose cross-section area is the same as that of the pile and the soil layers surrounding the pile are described by the plane strain model. Then, by virtue of Laplace transform and impedance function transfer method, the analytical solution of Longitudinal Dynamic response at the pile head in frequency domain is yielded. Also, the semi-analytical solution in time domain undergoing half-cycle sine pulse at the pile head is obtained by means of inverse Laplace transform. Based on these solutions, a parametric study is conducted to analyze emphatically the effects of parameters of soil below pile end on velocity admittance and reflected wave signals at the pile head. Additionally, a comparison with other models with different supporting conditions from soil below pile end is performed to verify the model presented.
