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Image segmentation based on local Chan-Vese model optimized by max-flow algorithm 17

Image segmentation based on local Chan-Vese model optimized ...

17th IEEE/ACIS International Conference on Software engineering, Artificial Intelligence, Networking and Parallel/distributed Computing, SNPd 2016

作者： Zhongguo, Li Lei, Zeng Ti, Wang Jian, Chen Bin, Yan National Digital Switching System Engineering and Technological R and D Center Zhengzhou China

ISBN: (纸本)9781509022397

Image segmentation can be used in non-destructive testing, tracking and recognition. Level set method for image segmentation has poor performance on efficiency. In this paper, we propose to use max-flow algorithm to optimize a locally improved Chan-Vese model for image segmentation in the presence of intensity inhomogeneity. The energy function of local Chan-Vese model is introduced firstly. This model consists of global term, local term and penalty term and the local term contributes the segmentation for images with intensity inhomogeneity. Then, we convert this energy function to the frame of Graph Cut whose energy function can be efficiently minimized by max-flow algorithm. As a result, the process of optimization of local Chan-Vese model can be accelerated by using max-flow algorithm. The experiments demonstrate that the proposed method can achieve satisfactory segmentation for images with intensity inhomogeneity as well as very high efficiency. © 2016 IEEE.

关键词： Image segmentation

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On the use of density-based algorithms for the analysis of solute clustering in atom probe tomography data 18th

On the use of density-based algorithms for the analysis of s...

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18th International Conference on Environmental degradation of Materials in Nuclear Power systems – Water reactors 2019

作者： Marquis, Emmanuelle A. Araullo-Peters, Vicente dong, Yan Etienne, Auriane Fedotova, Svetlana Fujii, Katsuhiko Fukuya, Koji Kuleshova, Evgenia Lopez, Anabelle London, Andrew Lozano-Perez, Sergio Nagai, Yasuyoshi Nishida, Kenji radiguet, Bertrand Schreiber, daniel Soneda, Naoki Thuvander, Mattias Toyama, Takeshi Sefta, Faiza Chou, Peter Department of Materials Science and Engineering University of Michigan Ann ArborMI48109 United States Groupe de Physique Des Matériaux UMR CNRS 6634 Université de Rouen Saint Etienne du Rouvray Cedex France Russian Research Center ‘Kurchatov Institute’ Pl. Kurtachova Moscow123 182 Russia Institute of Nuclear Safety System Inc. 64 Sata Mihama919-1205 Japan DEN-Service D’Etudes Des Matériaux Irradiés CEA Université Paris-Saclay Gif-Sur-YvetteF-91191 France Department of Materials University of Oxford Parks Road OxfordOX1 3PH United Kingdom The Oarai Center Institute for Materials Research Tohoku University OaraiIbaraki311-1313 Japan Materials Science Research Laboratory Central Research Institute of Electric Power Industry Nagasaka Japan Energy and Environment Directorate Pacific Northwest National Laboratory RichlandWA99352 United States Department of Physics Chalmers University of Technology GöteborgSE-412 96 Sweden Departement Métallurgie EDF—R&D Avenue Des Renardières—Ecuelles Moret-Sur-Loing77818 France Electric Power Research Institute Palo AltoCA94304 United States

ISBN: (纸本)9783319950211

Because atom probe tomography (APT) provides three-dimensional reconstructions of small volumes by resolving atomic chemical identities and positions, it is uniquely suited to analyze solute clustering phenomena in materials. A number of approaches have been developed to extract clustering information from the 3d reconstructed dataset, and numerous reports can be found applying these methods to a wide variety of materials questions. However, results from clustering analyses can differ significantly from one report to another, even when performed on similar microstructures, raising questions about the reliability of APT to quantitatively describe solute clustering. In addition, analysis details are often not provided, preventing independent confirmation of the results. With the number of APT research groups growing quickly, the APT community recognizes the need for educating new users about common methods and artefacts, and for developing analysis and data reporting protocols that address issues of reproducibility, errors, and variability. To this end, a round robin experiment was organized among ten different international institutions. The goal is to provide a consistent framework for the analysis of irradiated stainless steels using APT. Through the development of more reliable and reproducible data analysis and through communication, this project also aims to advance the understanding between irradiated microstructure and materials performance by providing more complete quantitative microstructural input for modeling. The results, methods, and findings of this round robin will also apply to other clustering phenomena studied using APT, beyond the theme of radiation damage. © 2019, The Minerals, Metals & Materials Society.

关键词： Cluster analysis

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direct position determination based on unitary space-time subspace data fusion

Direct position determination based on unitary space-time su...

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International Conference on Wireless Communications and Signal Processing (WCSP)

作者： Jie-xin Yin rui-rui Liu ding Wang Ying Wu Department of Communication Engineering Zhengzhou Information Science and Technology Institute Zhengzhou Henan P.R. China National Digital Switching System Engineering and Technology Research Center Zhengzhou Henan P.R.China

ISBN: (纸本)9781538620632;9781538620625

direct position determination (dPd) is a single-step method which directly localizes transmitters from sensor outputs without computing intermediate parameters. Compared with conventional two-step localization methods, dPd achieves higher accuracy especially under low signal to noise ratio (SNr) conditions. This paper proposes an improved subspace data fusion (SdF)-based dPd algorithm with a moving array. different from the existing SdF-based dPd which uses only the arrival angle information, the proposed algorithm exploits the location information embedded in both arrival angles and doppler shifts. It relies on a unitary space-time SdF, where multiple stationary transmitters are directly localized by fusing all the unitary (real-valued) space-time subspaces at all positions of the moving array. Therefore, our algorithm realizes the localization by real-valued computations. The simulation results show the superior localization performance of the proposed dPd compared to the existing SdF-based dPd and two-step localization algorithms.

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Correction: Assessing real-world gait with digital technology? Validation, insights and recommendations from the Mobilise-d consortium

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Journal of neuroengineering and rehabilitation 2024年第1期21卷 71页

作者： M Encarna Micó-Amigo Tecla Bonci Anisoara Paraschiv-Ionescu Martin Ullrich Cameron Kirk Abolfazl Soltani Arne Küderle Eran Gazit Francesca Salis Lisa Alcock Kamiar Aminian Clemens Becker Stefano Bertuletti Philip Brown Ellen Buckley Alma Cantu Anne-Elie Carsin Marco Caruso Brian Caulfield Andrea Cereatti Lorenzo Chiari Ilaria d'Ascanio Bjoern Eskofier Sara Fernstad Marcel Froehlich Judith Garcia-Aymerich Clint Hansen Jeffrey M Hausdorff Hugo Hiden Emily Hume Alison Keogh Felix Kluge Sarah Koch Walter Maetzler dimitrios Megaritis Arne Mueller Martijn Niessen Luca Palmerini Lars Schwickert Kirsty Scott Basil Sharrack Henrik Sillén david Singleton Beatrix Vereijken Ioannis Vogiatzis Alison J Yarnall Lynn rochester Claudia Mazzà Silvia del din Translational and Clinical Research Institute Faculty of Medical Sciences Newcastle University Newcastle Upon Tyne UK. Department of Mechanical Engineering and Insigneo Institute for in Silico Medicine The University of Sheffield Sheffield UK. Laboratory of Movement Analysis and Measurement Ecole Polytechnique Federale de Lausanne Lausanne Switzerland. Machine Learning and Data Analytics Lab Department of Artificial Intelligence in Biomedical Engineering Friedrich-Alexander-Universität Erlangen Nürnberg Erlangen Germany. Center for the Study of Movement Cognition and Mobility Neurological Institute Tel Aviv Sourasky Medical Center Tel Aviv Israel. Department of Biomedical Sciences University of Sassari Sassari Italy. Department of Electronics and Telecommunications Politecnico di Torino Turin Italy. National Institute for Health and Care Research (NIHR) Newcastle Biomedical Research Centre (BRC) Newcastle University and The Newcastle Upon Tyne Hospitals NHS Foundation Trust Newcastle Upon Tyne UK. Robert Bosch Gesellschaft für Medizinische Forschung Stuttgart Germany. The Newcastle Upon Tyne Hospitals NHS Foundation Trust Newcastle Upon Tyne UK. School of Computing Newcastle University Newcastle Upon Tyne UK. Barcelona Institute for Global Health (ISGlobal) Barcelona Spain. Universitat Pompeu Fabra Barcelona Catalonia Spain. CIBER Epidemiología y Salud Pública (CIBERESP) Madrid Spain. Insight Centre for Data Analytics University College Dublin Dublin Ireland. School of Public Health Physiotherapy and Sports Science University College Dublin Dublin Ireland. Department of Electrical Electronic and Information Engineering «Guglielmo Marconi» University of Bologna Bologna Italy. Health Sciences and Technologies-Interdepartmental Center for Industrial Research (CIRI-SDV) University of Bologna Bologna Italy. Grünenthal GmbH Aachen Germany. Department of Neurology University Medical Center Schleswig-Holstein Campus Kiel Kiel Germany. Sagol School of Neuroscien

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Fast parallel algorithm for three-dimensional distance-driven model in iterative computed tomography reconstruction

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Chinese Physics B 2015年第2期24卷 513-520页

作者：陈建林李磊王林元蔡爱龙席晓琦张瀚铭李建新闫镔 National Digital Switching System Engineering & Technological R&D Center

The projection matrix model is used to describe the physical relationship between reconstructed object and *** a model has a strong influence on projection and backprojection,two vital operations in iterative computed tomographic *** distance-driven model（ddM） is a state-of-the-art technology that simulates forward and back *** model has a low computational complexity and a relatively high spatial resolution;however,it includes only a few methods in a parallel operation with a matched model *** study introduces a fast and parallelizable algorithm to improve the traditional ddM for computing the parallel projection and backprojection *** proposed model has been implemented on a GPU（graphic processing unit） platform and has achieved satisfactory computational efficiency with no *** runtime for the projection and backprojection operations with our model is approximately 4.5 s and 10.5 s per loop,respectively,with an image size of 256×256×256 and 360 projections with a size of 512×*** compare several general algorithms that have been proposed for maximizing GPU efficiency by using the unmatched projection/backprojection models in a parallel *** imaging resolution is not sacrificed and remains accurate during computed tomographic reconstruction.

关键词： computed tomography iterative reconstruction parallelizable algorithm distance-driven model

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Principle of vector synthesis predistortion linearizers controlling AM/AM and AM/PM independently

Principle of vector synthesis predistortion linearizers cont...

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IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB)

作者： Wei-da Bai de-Wei Zhang Hai-Lin deng China National Digital Switching System Engineering and Technology R&D Center Zhengzhou China China National Digital Switching System Engineering and Technology R&D Center China

ISBN: (纸本)9781509013180

This paper using vector diagram illuminates the operation principle of vector synthesis predistortions and proves they can control amplitude modulation to amplitude modulation (AM/AM) and amplitude modulation to phase modulation (AM/PM) separately. A vector synthesis predistortion linearizer is designed to verify this thought and the results show the correctness of this thought.

关键词： Predistortion Attenuators Phase shifters Phase distortion Amplitude modulation Nonlinear distortion

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Fatigue characteristics of sand-cast AZ91d magnesium alloy

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Journal of Magnesium and Alloys 2017年第1期5卷 1-12页

作者： Zhenming Li Alan ALuo Qigui Wang Hui Zou Jichun dai Liming Peng Institute of Sci-technology Strategy JiangXi Academy of SciencesNanchang 330096China The Ohio State University ColumbusOH 43210USA General Motors Company Global Propulsion SystemPontiacMI 48340USA Research Institute(R&D Center) China Baowu Steel Group CorporationShanghai 201900China National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite Shanghai Jiao Tong UniversityShanghai 200240China

The fatigue characteristics of the AZ91d-T6 alloy samples taken from engine blocks have been investigated at 20℃ and elevated temperature(150℃).The fatigue strength and cyclic stress amplitude of the alloy significantly decrease with the increase of the test temperature,although cyclic hardening occurs continuously until failure for both *** the increase of the temperature,the decreased fatigue life of the alloy tested at the same stress amplitude is mainly attributed to the decreased matrix strength and the increased hysteresis *** failure of the engine blocks made of AZ91d-T6 alloy is mainly controlled by casting *** the defect-free specimens,the crack initiation behavior is determined by the single-slip(20℃)and by environment-assisted cyclic slip(150℃)during fatigue,*** low-cycle fatigue lives of the alloy can be predicted using the Coffin-Manson relation and Basquin laws,the three-parameter equation and the energy-based concepts,while the high-cycle fatigue lives of the alloy fitted well with the developed long crack life model and MSF life models.

关键词： Magnesium alloy Engine blocks Fatigue properties Cyclic deformation behavior Temperature Fatigue life prediction

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Analysis of Measured Sea clutter Power distribution based on Goodness-of-Fit Tests

Analysis of Measured Sea clutter Power Distribution based on...

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IEEE Asia-Pacific Conference on Antennas and Propagation

作者： Xiaoyan du Peipei Wei Guojun Tian Dept. of Information engineering Huanghe Science and Technology University Dept. of Communication National Digital Switching System Engineering & Technology R&D Center (NDSC)

ISBN: (纸本)9781538616093

recently, refractivity from clutter (rFC) is an important means to obtain spatial reflectivity distribution. As the input of rFC, radar sea clutter power seriously affects the inversion performance. For this problem, we study its distribution to get more priori information of inversion. Using this way, inversion accuracy could be improved. In this paper, seven kinds of power probability density function (PPdF) are presented. Based on these distribution models, The experimental data measured in Bohai Sea are analyzed. In addition, the goodness-of-fit tests are used to test the degree of fitness between the experimental data and the models. The results show that these radar sea clutter power data meet log-normal distribution or meet Weibull distribution.

关键词： Power probability density function (PPdF) Goodness-of-fit tests Log-normal distribution

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Secure Power and Subcarrier Auction in Uplink Fullduplex Cellular Networks

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China Communications 2015年第S1期12卷 157-165页

作者： LI Mingliang GUO Yunfei HUANG Kaizhi GUO Fei National Digital Switching System Engineering & Technological R&D Center

We consider a cellular network with a full-duplex base station, multiple uplink users and an eavesdropper. The full-duplex base station transmits jamming signals to degrade the eavesdropper channel when receiving secure multi-user signals. To maximize the secrecy rate of uplink communications, we propose a distributed ascending-clock auction(ACA) algorithm to allocate subcarriers and jamming power. Specifically, the impact of the self-interference of the full-duplex base station on the secrecy rate is considered. The proposed algorithm consists of two parts. Firstly, subcarriers and the jamming power are respectively priced by the base station. Secondly, users select the subcarrier and the jamming power based on the price. Moreover, the convergence of the proposed auction algorithm is mathematically proved. Simulation results show that the proposed auction algorithm is more beneficial to improve the uplink secrecy performance compared to traditional auction algorithms.

关键词： uplink auction physical layer security full-duplex self-interference

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A Collaborative Filtering recommendation Algorithm Based On Conditional Entropy Trust Model

A Collaborative Filtering Recommendation Algorithm Based On ...

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2016 3rd International Conference on Materials engineering,Manufacturing technology and Control(ICMEMTC 2016)

作者： Yitao Wu Xingming Zhang Xiaofeng Qi Erning Xiao Liang Jin National Digital Switching System Engineering and Technological R&D Center

The traditional collaborative recommendation algorithm doesn't take the non-linear dependence between users into consider, which is not accurate enough in prediction. The collaborative filtering algorithm based on entropy can measure the nonlinear characteristics of users, but it can't reasonably describe the relationship between users and is subject to sparsity. To address this problem, conditional entropy trust model is proposed, which uses the conditional entropy to describe the non-linear dependence between users, and Laplace estimation is introduced to alleviate sparsity. A collaborative filtering algorithm based on the conditional entropy trust model(CECF) is designed. The experiments show that this algorithm doesn't increase the time complexity and significantly improve the degree of accuracy.

关键词： non-linear dependence conditional entropy similarity calculation collaborative filtering

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