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8,677 results on '"Yongning An"'

1. Laboratory evaluation of calcareous sand specimens with inclined sedimentary surfaces

Author

Yongning An, Hongjun Liu, Tong Dong, Chao Liu, and Minsheng Zhang

Subjects
calcareous sand, inclined sedimentary surface, anisotropy, laboratory test, static and dynamic mechanical behavior, Engineering (General). Civil engineering (General), TA1-2040, City planning, HT165.5-169.9
Abstract

Sedimentary processes often produce natural and blown calcareous sands that are deposited in inclined and layered formations. These calcareous sands frequently exist in a complex stress state with rotating principal stress axes that result in intricate mechanical properties. To investigate the mechanical behaviors of calcareous sands with inclined sedimentary surfaces, we developed a device to prepare hollow cylindrical specimens from artificially crushed calcareous sands. By combining this device with a hollow cylindrical torsional shear apparatus, undrained monotonic loading and pure principal stress rotation tests were conducted to investigate the static and dynamic properties of the inherently anisotropic calcareous sands. The results indicate that the shear dilatancy property is related to the principal stress direction; the shear dilatancy of calcareous sand decreases as the direction of the principal stress increases, and the peak stress ratio decreases with increasing principal stress direction and increases with increasing deposition direction. In the precyclic loading period, increases in the deposition direction led to increases in the stabilities of the specimens and decreases in excess pore pressure accumulation, which further affect the dynamic shear modulus and damping ratio of the calcareous sand. In the late stage of cyclic loading, the inherent anisotropies of the specimens are destroyed, so that the excess pressure and hysteresis loop characteristics start to converge.

Published
2024
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2. Study on Guarantee System of Engineering Survey in Far and Deep sea

Author

Haodong CHEN, Yi HUANG, Bin ZHONG, Yongning AN, and Jing LI

Subjects
far and deep sea, engineering survey, guarantee system, bds, satellite communication, hse, emergency guarantee, Oceanography, GC1-1581
Abstract

Ocean engineering activities need to be carried out under the conditions of complete procedures and legal approval documents. However, because of the more complex environment and challenges, it is necessary to establish and improve the investigation and operation guarantee system. By analyzing the types, characteristics and demands of the engineering survey in far and deep sea, the contents and components of its guarantee system were discussed, and explanations on the ship and equipment support, organization and personnel support, offshore communication support, survey implementation scheme guarantee, quality management and control guarantee, HSE guarantee and emergency plan guarantee were given in detail. The construction method and process of engineering survey guarantee system in deep sea, were furtherly illustrated through an actual survey example. It is an important prerequisite for the smooth development and completion of the survey to build a complete guarantee system before the work of engineering survey in far and deep sea starts.

Published
2022

3. SambaNova SN40L: Scaling the AI Memory Wall with Dataflow and Composition of Experts

Author

Prabhakar, Raghu, Sivaramakrishnan, Ram, Gandhi, Darshan, Du, Yun, Wang, Mingran, Song, Xiangyu, Zhang, Kejie, Gao, Tianren, Wang, Angela, Li, Karen, Sheng, Yongning, Brot, Joshua, Sokolov, Denis, Vivek, Apurv, Leung, Calvin, Sabnis, Arjun, Bai, Jiayu, Zhao, Tuowen, Gottscho, Mark, Jackson, David, Luttrell, Mark, Shah, Manish K., Chen, Edison, Liang, Kaizhao, Jain, Swayambhoo, Thakker, Urmish, Huang, Dawei, Jairath, Sumti, Brown, Kevin J., and Olukotun, Kunle

Subjects
Computer Science - Hardware Architecture, Computer Science - Artificial Intelligence, C.1.3, C.0
Abstract

Monolithic large language models (LLMs) like GPT-4 have paved the way for modern generative AI applications. Training, serving, and maintaining monolithic LLMs at scale, however, remains prohibitively expensive and challenging. The disproportionate increase in compute-to-memory ratio of modern AI accelerators have created a memory wall, necessitating new methods to deploy AI. Composition of Experts (CoE) is an alternative modular approach that lowers the cost and complexity of training and serving. However, this approach presents two key challenges when using conventional hardware: (1) without fused operations, smaller models have lower operational intensity, which makes high utilization more challenging to achieve; and (2) hosting a large number of models can be either prohibitively expensive or slow when dynamically switching between them. In this paper, we describe how combining CoE, streaming dataflow, and a three-tier memory system scales the AI memory wall. We describe Samba-CoE, a CoE system with 150 experts and a trillion total parameters. We deploy Samba-CoE on the SambaNova SN40L Reconfigurable Dataflow Unit (RDU) - a commercial dataflow accelerator architecture that has been co-designed for enterprise inference and training applications. The chip introduces a new three-tier memory system with on-chip distributed SRAM, on-package HBM, and off-package DDR DRAM. A dedicated inter-RDU network enables scaling up and out over multiple sockets. We demonstrate speedups ranging from 2$\times$ to 13$\times$ on various benchmarks running on eight RDU sockets compared with an unfused baseline. We show that for CoE inference deployments, the 8-socket RDU Node reduces machine footprint by up to 19$\times$, speeds up model switching time by 15$\times$ to 31$\times$, and achieves an overall speedup of 3.7$\times$ over a DGX H100 and 6.6$\times$ over a DGX A100., Comment: 2024 57th IEEE/ACM International Symposium on Microarchitecture (MICRO)

Published
2024
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8. Sex-dependent interactions between prodromal intestinal inflammation and LRRK2 G2019S in mice promote endophenotypes of Parkinsons disease.

Author

Fang, Ping, Yu, Lewis, Espey, Hannah, Agirman, Gulistan, Kazmi, Sabeen, Li, Kai, Deng, Yongning, Lee, Jamie, Hrncir, Haley, Romero-Lopez, Arlene, Arnold, Arthur, and Hsiao, Elaine

Subjects
Animals, Leucine-Rich Repeat Serine-Threonine Protein Kinase-2, Parkinson Disease, Mice, Male, Female, Endophenotypes, alpha-Synuclein, Prodromal Symptoms, Disease Models, Animal, Mice, Transgenic, Humans, Sex Factors, Inflammation, Mice, Inbred C57BL, Sex Characteristics
Abstract

Gastrointestinal (GI) disruptions and inflammatory bowel disease (IBD) are commonly associated with Parkinsons disease (PD), but how they may impact risk for PD remains poorly understood. Herein, we provide evidence that prodromal intestinal inflammation expedites and exacerbates PD endophenotypes in rodent carriers of the human PD risk allele LRRK2 G2019S in a sex-dependent manner. Chronic intestinal damage in genetically predisposed male mice promotes α-synuclein aggregation in the substantia nigra, loss of dopaminergic neurons and motor impairment. This male bias is preserved in gonadectomized males, and similarly conferred by sex chromosomal complement in gonadal females expressing human LRRK2 G2019S. The early onset and heightened severity of neuropathological and behavioral outcomes in male LRRK2 G2019S mice is preceded by increases in α-synuclein in the colon, α-synuclein-positive macrophages in the colonic lamina propria, and loads of phosphorylated α-synuclein within microglia in the substantia nigra. Taken together, these data reveal that prodromal intestinal inflammation promotes the pathogenesis of PD endophenotypes in male carriers of LRRK2 G2019S, through mechanisms that depend on genotypic sex and involve early accumulation of α-synuclein in myeloid cells within the gut.

Published
2024

9. TERM: Tree Ensemble Models for Interpretable Rule Mining

Author

Zhu, Mengyu, Li, Zhao, Zhao, Jun, Liu, Xiaopeng, Liu, Yongning, Goos, Gerhard, Series Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Barhamgi, Mahmoud, editor, Wang, Hua, editor, and Wang, Xin, editor

Published
2025
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27. Research on the Construction of Highway Construction Environment Supervision System

Author

Liu, Yongning, Chan, Albert P. C., Series Editor, Hong, Wei-Chiang, Series Editor, Mellal, Mohamed Arezki, Series Editor, Narayanan, Ramadas, Series Editor, Nguyen, Quang Ngoc, Series Editor, Ong, Hwai Chyuan, Series Editor, Sachsenmeier, Peter, Series Editor, Sun, Zaicheng, Series Editor, Ullah, Sharif, Series Editor, Wu, Junwei, Series Editor, Zhang, Wei, Series Editor, Ahmad, Zakiah, editor, Ghadiri, Seyed Mohammadreza, editor, Li, Rita Yi Man, editor, and Lang, Ruiqing, editor

Published
2024
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30. The Integration of Ideological and Political Elements in the Teaching Process of Mechanical Engineering Materials and Thermal Processing-- Based on the Engineering Education Certification Model

Author

Zhang, Liangxia, Li, Yongning, Gao, Yu, Tian, Yunjing, Zhang, Weihua, Zhang, Chunlan, Striełkowski, Wadim, Editor-in-Chief, Black, Jessica M., Series Editor, Butterfield, Stephen A., Series Editor, Chang, Chi-Cheng, Series Editor, Cheng, Jiuqing, Series Editor, Dumanig, Francisco Perlas, Series Editor, Al-Mabuk, Radhi, Series Editor, Scheper-Hughes, Nancy, Series Editor, Urban, Mathias, Series Editor, Webb, Stephen, Series Editor, Khan, Intakhab Alam, editor, Halili, Siti Hajar, editor, Balakrishnan, Vishalache, editor, and Abd. Rauf, Rose Amnah, editor

Published
2024
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