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266 results on '"Wang, Ningyuan"'

7. The asymmetric particle population density method for simulation of coupled noisy oscillators

Author

Wang, Ningyuan and Forger, Daniel B

Subjects
Mathematics - Numerical Analysis, 65M75
Abstract

A wide variety of biological phenomena can be modeled by the collective activity of a population of individual units. A common strategy for simulating such a system, the population density approach, is to take the macroscopic limit and update its population density function. However, in many cases, the coupling between the units and noise gives rise to complex behaviors challenging to existing population density approach methods. To address these challenges, we develop the asymmetric particle population density (APPD) method that efficiently and accurately simulates such populations consist of coupled elements. The APPD is well-suited for a parallel implementation. We compare the performance of the method against direct Monte-Carlo simulation and verify its accuracy by applying it to the well-studied Hodgkin-Huxley model, with a range of challenging scenarios. We find that our method can accurately reproduce complex macroscopic behaviors such as inhibitory coupling-induced clustering and noise-induced firing while being faster than the direct simulation., Comment: 13 pages, 4 figures

Published
2021

9. The Level Set Kalman Filter for State Estimation of Continuous-discrete Systems

Author

Wang, Ningyuan and Forger, Daniel B.

Subjects
Electrical Engineering and Systems Science - Systems and Control
Abstract

We propose a new extension of Kalman filtering for continuous-discrete systems with nonlinear state-space models that we name as the level set Kalman filter (LSKF). The LSKF assumes the probability distribution can be approximated as a Gaussian, and updates the Gaussian distribution through a time-update step and a measurement-update step. The LSKF improves the time-update step when compared to existing methods, such as the continuous-discrete cubature Kalman filter (CD-CKF) by reformulating the underlying Fokker-Planck equation as an ordinary differential equation for the Gaussian, thereby avoiding expansion in time. Together with a carefully picked measurement-update method, numerical experiments show that the LSKF has a consistent performance improvement over CD-CKF for a range of parameters, while also simplifies the implementation, as no user-defined timestep subdivision between measurements is required, and the spatial derivatives of the drift function are not explicitly needed.

Published
2021
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10. To Be Continued

Author

Ji, Xiang, Wang, Ningyuan, Dong, Chuanwan, Luo, Yida, Liu, Bin, Series Editor, Ji, Xiang, Wang, Ningyuan, Dong, Chuanwan, Luo, Yida, and Allen, Edward, Translated by

Published
2022
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11. The Stone-Paving Story

Author

Ji, Xiang, Wang, Ningyuan, Dong, Chuanwan, Luo, Yida, Liu, Bin, Series Editor, Ji, Xiang, Wang, Ningyuan, Dong, Chuanwan, Luo, Yida, and Allen, Edward, Translated by

Published
2022
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14. Why Liangzhu 'City'?

Author

Ji, Xiang, Wang, Ningyuan, Dong, Chuanwan, Luo, Yida, Liu, Bin, Series Editor, Ji, Xiang, Wang, Ningyuan, Dong, Chuanwan, Luo, Yida, and Allen, Edward, Translated by

Published
2022
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15. Patterns of Stone Tools

Author

Ji, Xiang, Wang, Ningyuan, Dong, Chuanwan, Luo, Yida, Liu, Bin, Series Editor, Ji, Xiang, Wang, Ningyuan, Dong, Chuanwan, Luo, Yida, and Allen, Edward, Translated by

Published
2022
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17. Emergency Department Visits by Patients with Substance Use Disorder in the United States

Author

Zhang, Xingyu, Wang, Ningyuan, Hou, Fengsu, Ali, Yaseen, Dora-Laskey, Aaron, Dahlem, Chin Hwa, and McCabe, Sean Esteban

Abstract

Introduction: We aimed to characterize emergency department (ED) utilization and clinical characteristics of patients with substance use disorder (SUD) seeking emergency care for all reasons. Methods: Using 2016–2017 ED data from the National Hospital Ambulatory Medical Care Survey, we investigated demographics, ED resource utilization, and clinical characteristics of patients with SUD vs those without SUD.  Results: Of all adult ED visits (N = 27,609) in the US in 2016–2017, 11.1% of patients had SUD. Among ED patients with SUD, they were mostly non-Hispanic White (62.5%) and were more likely to be male (adjusted odds ratio [aOR] 1.80 confidence interval [CI], 1.66-1.95). Emergency department patients with SUD were also more likely to return to the ED within 72 hours (aOR 1.32, CI, 1.09-1.61) and more likely to be admitted to the hospital (aOR 1.28, CI, 1.14-1.43) and intensive care unit (aOR 1.40, CI, 1.05-1.85). Conclusion: Patients with SUD have specific demographic, socioeconomic, and clinical characteristics associated with their ED visits. These findings highlight the importance of recognizing co-existing SUD as risk factors for increasing morbidity in acutely ill and injured patients, and the potential role of the ED as a site for interventions aimed at reducing harm from SUD.

Published
2021

26. Time-to-Event Genome-Wide Association Study for Incident Cardiovascular Disease in People with Type 2 Diabetes Mellitus

Author

Heon Kwak, Soo, primary, B. Hernandez-Cancela, Ryan, primary, A DiCorpo, Daniel, primary, E. Condon, David, primary, Merino, Jordi, primary, Wu, Peitao, primary, A Brody, Jennifer, primary, Yao, Jie, primary, Guo, Xiuqing, primary, Ahmadizar, Fariba, primary, Meyer, Mariah, primary, Sincan, Murat, primary, M. Mercader, Josep, primary, Lee, Sujin, primary, Haessler, Jeffrey, primary, My T. Vy, Ha, primary, Lin, Zhaotong, primary, D. Armstrong, Nicole, primary, Gu, Shaopeng, primary, L. Tsao, Noah, primary, A. Lange, Leslie, primary, Wang, Ningyuan, primary, L. Wiggins, Kerri, primary, Trompet, Stella, primary, Liu, Simin, primary, J.F. Loos, Ruth, primary, Judy, Renae, primary, H. Schroeder, Philip, primary, Hasbani, Natalie R., primary, M. Bos, Maxime, primary, C. Morrison, Alanna, primary, D. Jackson, Rebecca, primary, P. Reiner, Alexander, primary, E. Manson, JoAnn, primary, S. Chaudhary, Ninad, primary, K. Carmichael, Lynn, primary, Ida Chen, Yii-Der, primary, D. Taylor, Kent, primary, Ghanbari, Mohsen, primary, van Meurs, Joyce, primary, N Pitsillides, Achilleas, primary, M. Psaty, Bruce, primary, Noordam, Raymond, primary, Do, Ron, primary, Soo Park, Kyong, primary, Wouter Jukema, J, primary, Kavousi, Maryam, primary, Correa, Adolfo, primary, S. Rich, Stephen, primary, M. Damrauer, Scott, primary, Hajek, Catherine, primary, H. Cho, Nam, primary, R. Irvin, Marguerite, primary, S. Pankow, James, primary, N. Nadkarni, Girish, primary, Sladek, Robert, primary, O. Goodarzi, Mark, primary, C. Florez, Jose, primary, I. Chasman, Daniel, primary, R. Heckbert, Susan, primary, Kooperberg, Charles, primary, Dupuis, Josée, primary, Malhotra, Rajeev, primary, S. de Vries, Paul, primary, Liu, Ching-Ti, primary, I. Rotter, Jerome, primary, and B. Meigs, James, primary

Published
2024
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31. A novel approach for quantitatively distinguishing between anthropogenic and natural effects on paleovegetation

Author

Fan, Baoshuo, primary, Lu, Houyuan, additional, Li, Yuecong, additional, Shen, Caiming, additional, Xu, Qinghai, additional, Zhang, Jianping, additional, Huan, Xiujia, additional, Wang, Yonglei, additional, Wang, Ningyuan, additional, Xu, Deke, additional, Dong, Yajie, additional, Cui, Anning, additional, and Wu, Naiqin, additional

Published
2024
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35. Development Strategy of Space Internet Constellation System in China

Author

Li Feng, Yu Hang, Ding Rui, Wang Ningyuan, Wang Yuqi, and Zhou Zhicheng

Subjects
space Internet constellation, frequency and orbit resource, satellite Internet standards, network security, application scenarios, Engineering (General). Civil engineering (General), TA1-2040
Abstract

The space Internet constellation system is an important component of China’s space information infrastructure and has become a focus of international competition in future. However, China is still in the preparatory stage of the space Internet constellation system construction. We started late and are faced with many risks such as a backward space resource position, lack of independent standards, a weak foundation for technological development, limitation in traditional application fields, and uncontrollability of network security; therefore, China’s space Internet constellation system is still far from supporting rapid economic and social development. Facing the opportunities and challenges, we overview the space Internet constellation system development in China and analyze the macro demand for space Internet construction. Subsequently, we analyze the development trend of the system both in China and abroad and propose the development ideas, key tasks, and technical routes of the space Internet constellation system construction in China. To improve the service abilities of China’s space information network and establish a flexible space system, we suggest that China should strengthen top-level planning at the national level in the design and engineering construction stages, accelerate the exploitation of space and frequency resources, formulate satellite Internet standards, intensify efforts to tackle key technologies, promote integrated and innovative applications, and build a network security and protection system.

Published
2021
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42. Heterogeneous effects on type 2 diabetes and cardiovascular outcomes of genetic variants and traits associated with fasting insulin.

Author

Manning, Alisa, primary, Sevilla-González, Magdalena, additional, Smith, Kirk, additional, Wang, Ningyuan, additional, Jensen, Aubrey, additional, Litkowski, Elizabeth, additional, Kim, Hyunkyung, additional, DiCorpo, Daniel, additional, Westerman, Kenneth, additional, Cui, Jinrui, additional, Liu, Ching-Ti, additional, Yu, Chenglong, additional, McNeil, John, additional, Lacaze, Paul, additional, Chang, Kyong-Mi, additional, Tsao, Phil, additional, Phillips, Lawrence, additional, Goodarzi, Mark, additional, Sladek, Rob, additional, Rotter, Jerome, additional, Dupuis, Josee, additional, Florez, Jose, additional, Merino, Jordi, additional, Meigs, James, additional, Zhou, Jin, additional, Raghavan, Sridharan, additional, and Udler, Miriam, additional

Published
2023
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43. Time-to-Event Genome-Wide Association Study for Incident Cardiovascular Disease in People with Type 2 Diabetes Mellitus

Author

Kwak, Soo Heon, primary, Hernandez-Cancela, Ryan B., additional, DiCorpo, Daniel A, additional, Condon, David E., additional, Merino, Jordi, additional, Wu, Peitao, additional, Brody, Jennifer A, additional, Yao, Jie, additional, Guo, Xiuqing, additional, Ahmadizar, Fariba, additional, Meyer, Mariah, additional, Sincan, Murat, additional, Mercader, Josep M., additional, Lee, Sujin, additional, Haessler, Jeffrey, additional, Vy, Ha My T., additional, Lin, Zhaotong, additional, Armstrong, Nicole D., additional, Gu, Shaopeng, additional, Tsao, Noah L., additional, Lange, Leslie A., additional, Wang, Ningyuan, additional, Wiggins, Kerri L., additional, Trompet, Stella, additional, Liu, Simin, additional, Loos, Ruth J.F., additional, Judy, Renae, additional, Schroeder, Philip H., additional, Hasbani, Natalie R., additional, Bos, Maxime M., additional, Morrison, Alanna C., additional, Jackson, Rebecca D., additional, Reiner, Alexander P., additional, Manson, JoAnn E., additional, Chaudhary, Ninad S., additional, Carmichael, Lynn K., additional, Chen, Yii-Der Ida, additional, Taylor, Kent D., additional, Ghanbari, Mohsen, additional, van Meurs, Joyce, additional, Pitsillides, Achilleas N, additional, Psaty, Bruce M., additional, Noordam, Raymond, additional, Do, Ron, additional, Park, Kyong Soo, additional, Jukema, J Wouter, additional, Kavousi, Maryam, additional, Correa, Adolfo, additional, Rich, Stephen S., additional, Damrauer, Scott M., additional, Hajek, Catherine, additional, Cho, Nam H., additional, Irvin, Marguerite R., additional, Pankow, James S., additional, Nadkarni, Girish N., additional, Sladek, Robert, additional, Goodarzi, Mark O., additional, Florez, Jose C., additional, Chasman, Daniel I., additional, Heckbert, Susan R., additional, Kooperberg, Charles, additional, Dupuis, Josée, additional, Malhotra, Rajeev, additional, de Vries, Paul S., additional, Liu, Ching-Ti, additional, Rotter, Jerome I., additional, and Meigs, James B., additional

Published
2023
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45. A New Method of Plane-Wave Ultrasound Imaging Based on Reverse Time Migration

Author

Pan, Yue, Wang, Xingying, Qiang, Yu, Wang, Ningyuan, Liu, Rong, Yang, Ge, Zhang, Zhiqiang, He, Xiao, Yu, Yanyan, Zheng, Hairong, and Qiu, Weibao

Abstract

Coherent plane-wave compounding technique enables rapid ultrasound imaging with comparable image quality to traditional B-mode imaging that relies on focused beam transmission. However, existing methods assume homogeneity in the imaged medium, neglecting the heterogeneity in sound velocities and densities present in real tissues, resulting in noise reverberation. This study introduces the Reverse Time Migration (RTM) method for ultrasound plane-wave imaging to overcome this limitation, which is combined with a method for estimating the speed of sound in layered media. Simulation results in a homogeneous background demonstrate that RTM reduces side lobes and grating lobes by approximately 30 dB, enhancing the contrast-to-noise ratio by 20% compared to conventional delay and sum (DAS) beamforming. Moreover, RTM achieves superior imaging outcomes with fewer compounding angles. The lateral resolution of the RTM with 5–9 angle compounding is able to achieve the effectiveness of the DAS method with 15–19 angle compounding, and the CNR of the RTM with 11-angle compounding is almost the same as that of the DAS with 21-angle compounding. In a heterogeneous background, experimental simulations and in vitro wire phantom experiments confirm RTM's capability to correct depth imaging, focusing reflected waves on point targets. In vitro porcine tissue experiments enable accurate imaging of layer interfaces by estimating the velocities of multiple layers containing muscle and fat. The proposed imaging procedure optimizes velocity estimation in complex media, compensates for the impact of velocity differences, provides more reliable imaging results.

Published
2024
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46. A Multiplexed 32 × 32 2D Matrix Array Transducer for Flexible Sub-Aperture Volumetric Ultrasound Imaging

Author

Wang, Ningyuan, Qiang, Yu, Qiu, Chaorui, Chen, Yiliang, Wang, Xingying, Pan, Yue, Liu, Rong, Wu, Weichang, Zheng, Hairong, Qiu, Weibao, and Zhang, Zhiqiang

Abstract

A fully-sampled two-dimensional (2D) matrix array ultrasonic transducer is essential for fast and accurate three-dimensional (3D) volumetric ultrasound imaging. However, these arrays, usually consisting of thousands of elements, not only face challenges of poor performance and complex wiring due to high-density elements and small element sizes but also put high requirements for electronic systems. Current commercially available fully-sampled matrix arrays, dividing the aperture into four fixed sub-apertures to reduce system channels through multiplexing are widely used. However, the fixed sub-aperture configuration limits imaging flexibility and the gaps between sub-apertures lead to reduced imaging quality. In this study, we propose a high-performance multiplexed matrix array by the design of 1–3 piezocomposite and gapless sub-aperture configuration, as well as optimized matching layer materials. Furthermore, we introduce a sub-aperture volumetric imaging method based on the designed matrix array, enabling high-quality and flexible 3D ultrasound imaging with a low-cost 256-channel system. The influence of imaging parameters, including the number of sub-apertures and steering angle on imaging quality was investigated by simulation, in vitro and in vivo imaging experiments. The fabricated matrix array has a center frequency of 3.4 MHz and a −6 dB bandwidth of above 70%. The proposed sub-aperture volumetric imaging method demonstrated a 10% improvement in spatial resolution, a 19% increase in signal-to-noise ratio, and a 57.7% increase in contrast-to-noise ratio compared with the fixed sub-aperture array imaging method. This study provides a new strategy for high-quality volumetric ultrasound imaging with a low-cost system.

Published
2024
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