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27 results on '"He, Guangxin"'

2. Influence of Murder Incident of Ride-hailing Drivers on Ride-hailing User's Consuming Willingness in Nanchang

Author

He, Guangxin, Yang, Shenghuan, Lei, Miaomiao, Wu, Xing, Sun, Yixin, and Dang, Yimeng

Subjects
Computer Science - Computers and Society
Abstract

Due to the frequent murder incidents of ride-hailing drivers in China in 2018, ride-hailing companies took a series of measures to prevent such incidents and ensure ride-hailing passengers' safety. This study investigated users' willingness to use ride-hailing apps after murder incidents and users' attitudes toward Safety Rectification. We found that murder incidents of ride-hailing drivers had a significant adverse impact on people's usage of ride-hailing apps. Female users' consuming willingness was 0.633 times that of male users, such as" psychological harm" was more evident among females, and Safety Rectification had a calming effect for some users. Finally, we found that people were satisfied with ride-hailing apps' efficiency, but were not satisfied with safety and reliability, considered them important; female users were more concerned about the security than male users.

Published
2020

7. Modeling and Optimizing the Scaling Performance in Distributed Deep Learning Training

Author

Liu, Ting, Miao, Tianhao, Wu, Qinghua, Li, Zhenyi, He, Guangxin, Wu, Jiaoren, Zhang, Shengzhuo, Yang, Xingwu, Tyson, Gareth, Xie, Gaogang, Liu, Ting, Miao, Tianhao, Wu, Qinghua, Li, Zhenyi, He, Guangxin, Wu, Jiaoren, Zhang, Shengzhuo, Yang, Xingwu, Tyson, Gareth, and Xie, Gaogang

Abstract

Distributed Deep Learning (DDL) is widely used to accelerate deep neural network training for various Web applications. In each iteration of DDL training, each worker synchronizes neural network gradients with other workers. This introduces communication overhead and degrades the scaling performance. In this paper, we propose a recursive model, OSF (Scaling Factor considering Overlap), for estimating the scaling performance of DDL training of neural network models, given the settings of the DDL system. OSF captures two main characteristics of DDL training: the overlap between computation and communication, and the tensor fusion for batching updates. Measurements on a real-world DDL system show that OSF obtains a low estimation error (ranging from 0.5% to 8.4% for different models). Using OSF, we identify the factors that degrade the scaling performance, and propose solutions to effectively mitigate their impacts. Specifically, the proposed adaptive tensor fusion improves the scaling performance by 32.2%150% compared to the constant tensor fusion buffer size. © 2022 Owner/Author.

Published
2022

20. Lethal factors of diseases and protective countermeasures of wild and penned Giant pandas

Author

Zou Xinghuai, He Guangxin, Chen Yucun, Zeng Lujin, Weng Nina, Wang Aimin, and Wu Kongju

Subjects
Pediatrics, medicine.medical_specialty, Forestry, Disease, Biology, medicine.disease, Lethal factor, Malnutrition, Epilepsy, Pericarditis, PANDAS, medicine, Statistical analysis, Pneumonia (non-human)
Abstract

Statistical analysis of certain major diseases lethal to the animal was carried out through on-spot investigations and consultations to related documentary materials. The results show that the first serious lethal factor is digestive system diseases. Next comes malnutrition and organic exhaustion. In order of decremental percentages, other diseases are roundworm disease, epilepsy, toxicosis, pneumonia, tumor, pericarditis, etc.. In relation to 54 wild giant pandas taken for statistics, the death of malnutrition, organic exhaustion caused accounts for 42.78%. In order of reducing percentages, other diseases are roundworm disease, toxicosis, epilepsy, etc.. Based on the statistics of 22 penned giant pandas, the death out of the digestive system diseases comes first, accounting for 63.64%. Other diseases in order of decremental proportion are epilepsy, organic exhaustion, etc., Gastroenteric hemorrhage is one of the highest mortality in digestive system diseases, the next comes orderly roundworm disease, hemorrhage, gatroenteritis and intestinal obstruction. The mortality of the sub-adults is the highest, accounting for 64.29%, or 2.6 times as that of the adults, or 7 times as that of the aged giant pandas. Some prevention measures of diseases for Giant pandas were also discussed in this paper.

Published
1998

27. A Simplified Model for Unstable Temperature Field Calculation of Gas Turbine Rotor

Author

He Guangxin

Subjects
Gas turbines, Engineering, Turbine blade, Field (physics), business.industry, Rotor (electric), Root (chord), Mechanical engineering, Radius, Mechanics, Finite element method, law.invention, law, business, Groove (music)
Abstract

Fir-tree roots are usually adopted for rotor blades of gas turbine. Strictly speaking it should be treated as a three-dimensional problem for temperature field calculation of turbine rotor with fir-tree roots. In this paper, a simplified model is presented for calculating the unstable temperature field of a cooled turbine rotor by finite element method. In the simplified model, an outer radius Rb for calculating has been chosen which is smaller than the radius of the fir-tree root groove’s bottom. And an equivalent heat release coefficient α has been introduced. Thus the calculation can be treated as an axial symmetrical problem and carried out on a microcomputer. The simplified model has been used to calculate the unstable temperature field during starting a rotor. The comparison with the three-dimensional calculated result shows that the simplified model is satisfactory. For example, at 170th sec. after firing the temperature difference at the outer radius Rb is only 6% for the two methods.Copyright © 1989 by ASME

Published
1989

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