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182 results on '"Hu, Changping"'

2. Stabilizing DARTS with Amended Gradient Estimation on Architectural Parameters

Author

Bi, Kaifeng, Hu, Changping, Xie, Lingxi, Chen, Xin, Wei, Longhui, and Tian, Qi

Subjects
Computer Science - Machine Learning, Computer Science - Computer Vision and Pattern Recognition, Statistics - Machine Learning
Abstract

DARTS is a popular algorithm for neural architecture search (NAS). Despite its great advantage in search efficiency, DARTS often suffers weak stability, which reflects in the large variation among individual trials as well as the sensitivity to the hyper-parameters of the search process. This paper owes such instability to an optimization gap between the super-network and its sub-networks, namely, improving the validation accuracy of the super-network does not necessarily lead to a higher expectation on the performance of the sampled sub-networks. Then, we point out that the gap is due to the inaccurate estimation of the architectural gradients, based on which we propose an amended estimation method. Mathematically, our method guarantees a bounded error from the true gradients while the original estimation does not. Our approach bridges the gap from two aspects, namely, amending the estimation on the architectural gradients, and unifying the hyper-parameter settings in the search and re-training stages. Experiments on CIFAR10 and ImageNet demonstrate that our approach largely improves search stability and, more importantly, enables DARTS-based approaches to explore much larger search spaces that have not been investigated before., Comment: 22 pages, 12 figures, submitted to ICML 2020, updated experiments on Penn Treebank

Published
2019

7. A Noninvasive Calibration-Free and Model-Free Surgical Robot for Automatic Fracture Reduction

Author

Zhu, Shijie, Chen, Yitong, Chen, Yu, Sun, Jiawei, Zhao, Zhe, Hu, Changping, Zheng, Gangtie, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Yu, Haibin, editor, Liu, Jinguo, editor, Liu, Lianqing, editor, Ju, Zhaojie, editor, Liu, Yuwang, editor, and Zhou, Dalin, editor

Published
2019
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21. Exploring a New Model for Preprint Server: A Case Study of CSPO

Author

Hu, Changping, Zhang, Yaokun, and Chen, Guo

Abstract

This paper describes the introduction of an open-access preprint server in China covering 43 disciplines. The system includes mandatory deposit for state-funded research and reports on the repository and its effectiveness and outlines a novel process of peer-review of preprints in the repository, which can be incorporated into the established system of promotion and tenure. This state-initiated innovation is considered to have been well incorporated into the established scientific communication system despite the sociological differences between the various disciplines served by the repository. (Contains 3 figures and 2 tables.)

Published
2010
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24. Smoothed-Truncated-Sine (STS) Pattern for Accuracy Improvement in Sinusoidal Fringe Projection Profilometry

Author

Li, Zhihu, Hu, Changping, Zhang, Jiwen, Wang, Guolei, Wu, Dan, Liu, Shuntao, and Xu, Jing

Abstract

Sinusoidal patterns are widely employed in fringe projection profilometry (FPP) for high-accuracy measurements. However, in practice, random factors, such as camera noise, will seriously affect the accuracy of sinusoidal patterns. This article presents a smoothed-truncated-sine (STS) pattern design method that can achieve higher accuracy than sinusoidal patterns under the same noise. By insensitive harmonic modulation, the STS pattern can achieve a higher signal-to-noise ratio (SNR) to reduce the random error and maintain the amplitude of sensitive harmonics low to restrain the systematic error. First, the error mechanism is analyzed, and the error model is established for the phase-shifting algorithm, taking into account the resistance of the phase-shifting algorithm to part of high-order harmonic errors. Second, an STS pattern is proposed and optimized based on the error model. The parameters of the STS pattern are optimized to achieve a high SNR and a small phase error, resulting in improved performance of the multiple-step phase-shifting algorithm, especially when the number of steps is large. Simulations and experiments demonstrate that the proposed method achieves higher accuracy than sinusoidal patterns and that the maximum error reduction ratio exceeds 20% if the number of steps is sufficiently large in sinusoidal FPP.

Published
2023
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31. Research on Design and Manufacturing Collaboration of Ship Shop

Author

Bian Dezhi, Wang Meng, and Hu Changping

Subjects
Scheme (programming language), Computer science, business.industry, Cloud computing, Solid modeling, Application software, computer.software_genre, Manufacturing engineering, Naval architecture, Manufacturing data, Collaborative management, business, computer, computer.programming_language, Data integration
Abstract

In view of the problem of “information island” caused by the lack of collaborative management of application software in the current design and manufacturing process of ship shop, this paper puts forward a scheme of building application collaboration of ship shop design and manufacturing on the basis of private cloud platform. All kinds of resources needed in the whole life cycle of ship design and manufacturing are packaged together. Ship design and manufacturing units distributed in different places connect the private cloud platform, utilize the design and manufacturing resources on the cloud, realize business collaboration between design and manufacturing applications, and make the seamless flow of design and manufacturing data through.

Published
2020

32. Reduction of Anode Effect Duration in 400kA Prebake Cells

Author

Zhang, Wei, primary, Wong, David, additional, Gilbert, Michel, additional, Gao, Yashuang, additional, Dorreen, Mark, additional, Taylor, Mark, additional, Tabereaux, Alton, additional, Soffer, Melinda, additional, Sun, Xiaopu, additional, Hu, Changping, additional, Liang, Xueming, additional, Oin, Haitang, additional, Mao, Jihong, additional, and Lin, Xuehui, additional

Published
2011
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41. Research on the Cross-System Collaboration Model of E-Government in China from the Perspective of System Elements

Author

Chen Guo and Hu Changping

Subjects
Service (systems architecture), Knowledge management, Computer science, business.industry, media_common.quotation_subject, Perspective (graphical), Shared resource, Conceptual model, Information system, Technology fusion, Resource management, Architecture, business, media_common
Abstract

In former researches, the constructions of cross-system collaboration model of e-government are mostly limited to some specific technical architecture. To resolve this problem, we constructed a general conceptual model of cross-system collaboration from the perspective of the e-government system elements. Accordingly, the decomposed sub models are discussed, including the resource sharing model, the technology fusion model and the service collaboration model. Each of these sub models are constructed based on the conclusion of general characteristic of former models.

Published
2014

42. The Influencing Factors of Knowledge Sharing Behavior on College Students in Virtual Communities

Author

Hu Changping and Wan Li

Subjects
Empirical research, Key factors, Knowledge management, business.industry, media_common.quotation_subject, Knowledge engineering, Loyalty, Psychology, business, Virtual community, Structural equation modeling, Knowledge sharing, media_common
Abstract

The paper builds the influential factor model of virtual community knowledge sharing behavior from the four dimensions. By using structural equation model, the paper makes an empirical research on the key factors of promoting the college students' knowledge sharing behavior in the virtual community and the impact of knowledge sharing behavior of virtual community members on the community loyalty.

Published
2014

44. Latest Results from PFC Investigation in China

Author

Liu Yonggang, Guo Huifang, Yang Jianhong, Li Defeng, Chen Xi-ping, Hu Changping, and Li Wangxing

Subjects
Line current, Materials science, Metallurgy, Analytical chemistry, Anode effect, Anode
Abstract

In the first half year of 2011, PFC investigation has been conducted on five potlines whose line currents are at the range of 200~350kA. The total aluminum output is 1.35 million tons per year. Both PFC caused by anode effects and PFC unrelated to anode effects were monitored and calculated. C3F8 was observed during anode effects for the first time and its peaks were at the same location as C2F6 and CF4 at the timetable. The weigh ratio of C3F8/CF4 was 4.19%, and that of C2F6/CF4 was 11.61%. C3F8 was observed only in the monitoring of two potlines and no C3F8 in the other three potlines. Concentration curves of C3F8 were plotted with C2F6. Percentage of Non Anode Effect PFC (NAE-PFC) of five potlines was calculated. The highest was 92.8% while the potline has the lowest anode effect frequency (AEF) and its AEF is 0.01 AEs/cell-day.

Published
2012

46. Construction of Web-Based Learning Platform for Information Management Subject - Case Study on “Information Service & User” Course Website

Author

Zhao Xue-qin and Hu Changping

Subjects
Information management, Service (systems architecture), Open platform, Multimedia, business.industry, Computer science, Frame (networking), Subject (documents), computer.software_genre, JavaScript, World Wide Web, Interactivity, ComputingMilieux_COMPUTERSANDEDUCATION, The Internet, business, computer, computer.programming_language
Abstract

The paper refers to the construction and practice of Web-based teaching platform for Information management subject based on the course of "information service and user" (IS&U) , which using interactive theory that among teaching, practice and research to realize the construction of the platform. The frame of platform is based on teacher-student interactivity on B/S. The Web site of the course uses ASP technology based on Microsoft and program language such as VBScript5.50 , JavaScript 5.6. We summarize the experience of the opening teaching platform as to deepen the further teaching reform.

Published
2008

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