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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. Source


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. Source


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. Source


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. Source


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. Source

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