State Key Laboratory of Virtual Reality Technology and system

Laboratory of, China

State Key Laboratory of Virtual Reality Technology and system

Laboratory of, China
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Guo Z.,State Key Laboratory of Virtual Reality Technology and System | Guo Z.,Beihang University | Zhou D.,State Key Laboratory of Virtual Reality Technology and System | Zhou D.,Beihang University | And 2 more authors.
Risk, Reliability and Safety: Innovating Theory and Practice - Proceedings of the 26th European Safety and Reliability Conference, ESREL 2016 | Year: 2017

Thorough consideration of maintainability design for space station has great significance to maintain the normal function and prolong on-orbit service life by replacing on-orbit replaceable unit (ORU). Chinese space station will be completed in around 2020, which has great demand for logistics support and maintainability. However, the theoretical and technical reserve of Chinese aerospace industry for space station are relatively scanty. The International Space Station (ISS) and Mir space station adopted many maintainability design methods and have great effect. The theoretical life of Mir space station and ISS are 5 and 15 years respectively, while the actual life is extended to 15 years and 20 years respectively via maintenance. Besides, the astronauts have successfully solved several failures which threaten the safety of space station and survival of crews via replacing ORUs during the operation of space station. © 2017 Taylor & Francis Group, London.


Geng J.,State Key Laboratory of Virtual Reality Technology and System | Geng J.,Beihang University | Li Y.,Aircraft Maintenance and Engineering Corporation | Wang R.,Beihang University | And 5 more authors.
Acta Astronautica | Year: 2017

In this study, a Virtual Maintenance (VM)-based approach for satellite troubleshooting assessment is proposed. By focusing on various elements in satellite assemble troubleshooting, such as accessibility, ergonomics, wiring, and extent of damage, a systematic, quantitative, and objective assessment model is established to decrease subjectivity in satellite assembling and troubleshooting assessment. Afterwards, based on the established assessment model and satellite virtual prototype, an application process of this model suitable for a virtual environment is presented. Finally, according to the application process, all the elements in satellite troubleshooting are analyzed and assessed. The corresponding improvements, which realize the transformation from a conventional way to a virtual simulation and assessment, are suggested, and the flaws in assembling and troubleshooting are revealed. Assembling or troubleshooting schemes can be improved in the early stage of satellite design with the help of a virtual prototype. Repetition in the practical operation is beneficial to companies as risk and cost are effectively reduced. © 2017 IAA


Geng J.,State Key Laboratory of Virtual Reality Technology and System | Geng J.,Beihang University | Lv C.,State Key Laboratory of Virtual Reality Technology and System | Lv C.,Beihang University | And 5 more authors.
Simulation Modelling Practice and Theory | Year: 2014

This study presents a novel compensation-based methodology for maintenance time prediction in a virtual environment during the early stage of product design. According to the work procedure in assigning maintenance tasks, a maintenance process simulation is generated on the virtual maintenance platform by following the simulation principle. The basic compensation time or ratio is acquired by analyzing the relationship between practical human motions and corresponding virtual human motions. After that, the compensation principle is confirmed based on the generated simulation principle. Finally, the simulation time and compensation time are approached according to the compensation model to obtain the predicted time. The obtained predicted time of several cases are accurate to a certain extent compared with feedback information. © 2014 Elsevier B.V. All rights reserved.


Geng J.,Beihang University | Geng J.,State Key Laboratory of Virtual Reality Technology and System | Lv C.,Beihang University | Lv C.,State Key Laboratory of Virtual Reality Technology and System | And 5 more authors.
Materials Research Innovations | Year: 2015

This paper presents a novel stealth-coating analysis method based on virtual visualisation technology to provide recommendations for stealthcoating in fighter design and maintenance. The proposed methodology focuses on the inherent property and extrinsic performance of the stealth material and visualises both stealth coating and its performance in a virtual environment according to corresponding material properties. Stealth-coating design or maintenance is then conducted in a predictive manner intuitively and systemically for analysis. A case study on infrared stealth is presented to illustrate the performance of the method. Results show the feasibility of virtual visualisation in improving fighter stealth-coating design. © W. S. Maney & Son Ltd 2015.


Zou Y.-Z.,Beijing Institute of Strength and Environment | Zou Y.-Z.,State Key Laboratory of Virtual Reality Technology and System | Lv C.,State Key Laboratory of Virtual Reality Technology and System | Lv C.,Beihang University | Liu R.,Beihang University
ICALIP 2010 - 2010 International Conference on Audio, Language and Image Processing, Proceedings | Year: 2010

With the rapid development of computer technology, Virtual Reality (VR) technology becomes more and more widely used in fields related to maintenance work. In this article, the composition and technical characteristics of VR technology is introduced, the development history and research background of VR technology is reviewed, and application status of VR system is analyzed. The application of using VR technology in equipment maintenance work, especially in the work of maintenance designing and analysis, is emphasized on in this paper, and the application prospects of VR technology are discussed. ©2010 IEEE.


Geng J.,State Key Laboratory of Virtual Reality Technology and System | Geng J.,Beihang University | Zhou D.,State Key Laboratory of Virtual Reality Technology and System | Zhou D.,Beihang University | And 3 more authors.
CAD Computer Aided Design | Year: 2013

This paper presents a novel virtual maintenance application for maintenance safety evaluation (MSE) to provide recommendations on maintenance safety during the early stages of product design. The proposed methodology detects the potential defects via virtual maintenance technology, and safety evaluation could be carried out in a predictive way intuitively and systemically to decrease the possibility of accidents. After reviewing relevant publications, a MSE model with thorough consideration of the characters in the virtual maintenance environment was addressed. The model consists of evaluation contributors, evaluation criteria, and evaluation methodology. A case study on APU system maintenance was used to illustrate the performance of the evaluation model. The result showed the feasibility of virtual maintenance in improving maintenance safety designs. © 2013 Elsevier Ltd. All rights reserved.


Shen Z.,Hewlett - Packard | Shen Z.,State Key Laboratory of Virtual Reality Technology and system | Du L.,Hewlett - Packard | Du L.,State Key Laboratory of Computer Science | And 2 more authors.
Proceedings - IEEE International Conference on Data Mining, ICDM | Year: 2010

In this paper, we propose the Interval-valued Matrix Factorization (IMF) framework. Matrix Factorization (MF) is a fundamental building block of data mining. MF techniques, such as Nonnegative Matrix Factorization (NMF) and Probabilistic Matrix Factorization (PMF), are widely used in applications of data mining. For example, NMF has shown its advantage in Face Analysis (FA) while PMF has been successfully applied to Collaborative Filtering (CF). In this paper, we analyze the data approximation in FA as well as CF applications and construct interval-valued matrices to capture these approximation phenomenons. We adapt basic NMF and PMF models to the interval-valued matrices and propose Interval-valued NMF (I-NMF) as well as Interval-valued PMF (I-PMF). We conduct extensive experiments to show that proposed I-NMF and I-PMF significantly outperform their single-valued counterparts in FA and CF applications. © 2010 IEEE.


Shen Z.,Hewlett - Packard | Shen Z.,State Key Laboratory of Virtual Reality Technology and system | Luo P.,Hewlett - Packard | Yang S.,Hewlett - Packard | Shen X.,State Key Laboratory of Virtual Reality Technology and system
HP Laboratories Technical Report | Year: 2010

In this paper we propose a framework of topic modeling ensembles, a novel solution to combine the models learned by topic modeling over each partition of the whole corpus. It has the potentials for applications such as distributed topic modeling for large corpora, and incremental topic modeling for rapidly growing corpora. Since only the base models, not the original documents, are required in the ensemble, all these applications can be performed in a privacy preserving manner. We explore the theoretical foundation of the proposed framework, give its geometric interpretation, and implement it for both PLSA and LDA. The evaluation of the implementations over the synthetic and real-life data sets shows that the proposed framework is much more efficient than modeling the original corpus directly while achieves comparable effectiveness in terms of perplexity and classification accuracy. © Copyright The 18th ACM Conference on Information and Knowledge Management, 2009.

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