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Shanghai, China

Wang L.,Beihang University | Xu L.D.,Shanghai JiaoTongUniversity | Xu L.D.,Old Dominion University | Bi Z.,Indiana University - Purdue University Fort Wayne | Xu Y.,China National Institute of Standardization
IEEE Transactions on Industrial Informatics | Year: 2014

Today's manufacturing environments are very dynamic and turbulent. Traditional enterprise information systems (EISs) have mostly been implemented upon hierarchical architectures, which are inflexible to adapt changes and uncertainties promptly. Next-generation EISs must be agile and adaptable to accommodate changes without significant time delays. It is essential for an EIS to obtain real-time data from the distributed and dynamic manufacturing environment for decision making. Wireless sensor networks (WSNs) and radio-frequency identification (RFID) systems provide an excellent infrastructure for data acquisition, distribution, and processing. In this paper, some key challenges related to the integration of WSN and RFID technologies are discussed. A five-layer system architecture has been proposed to achieve synergistic performance. For the integration of WSN and RFID, one of the critical issues is the low efficiency of communication due to redundant data as redundant data increases energy consumption and causes time delay. To address it, an improved data cleaning algorithm has been proposed; its feasibility and effectiveness have been verified via simulation and a comparison with a published algorithm. To illustrate the capacity of the developed architecture and new data cleaning algorithm, their application in relief supplies storage management has been discussed. © 2005-2012 IEEE. Source

Mai H.,Foshan Power Supply Bureau | Chen X.X.,Shanghai JiaoTongUniversity | Li Y.R.,Shanghai JiaoTongUniversity | Wei C.,Shanghai JiaoTongUniversity | Zhang Y.M.,Shanghai JiaoTongUniversity
Advanced Materials Research | Year: 2014

To suppress the stochastic pulse interference in XLPE Cables, this paper uses equivalent time-frequency method to extract pulse feature values, adaptive fuzzy clustering to classify pulses, phase concentration as an index to distinguish PD and stochastic pulses. Analysis results of on-site data show that this method can effectively suppress stochastic pulse interference in the PD signal, providing a useful theoretical and practical basis to assess the state of XLPE cable insulation. © (2014) Trans Tech Publications, Switzerland. Source

Wang Q.,Shanghai JiaoTongUniversity | Lu Z.,Shanghai JiaoTongUniversity | Zheng H.,Shanghai JiaoTongUniversity
European Physical Journal B | Year: 2016

The coupling effects on the optical absorption spectrum of semiconductor quantum dots arestudied by using the standard model with valence and conduction band levels coupled todispersive quantum phonons of infinite modes. By deducing the analytical expression of theoptical absorption coefficient, the relationship between the measurable quantities and theintrinsic properties of the semiconductor quantum dot is established. By this expression,the peak position, the line shape, the linewidth, and the energy shift of the absorptionspectrum of semiconductor quantum dot can be calculated precisely for a wide range ofparameters. The role of coupling strength as a mechanism of absorption line asymmetry isinvestigated, and the calculation results clearly show the coupling-induced asymmetry inthe absorption line. This analytical approach is applied to GaAs quantum dot, and theresults are consistent with those of experiment observations. © 2016, EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg. Source

Ying G.,Shanghai JiaoTongUniversity | Meng G.,Shanghai JiaoTongUniversity | Long X.,Shanghai JiaoTongUniversity | Jing J.,Shanghai JiaoTongUniversity
Jixie Qiangdu/Journal of Mechanical Strength | Year: 2010

The whole engine system was divided into main body subsystem and manifold-turbocharger subsystem. The dynamics models of these two subsystems were established separately, and were synthesized by free interface modal synthesis method. The vibration modes and vibration responses were obtained from the synthesized system equations. The calculated results agreed well with the experiment results. Through this study, the response of turbocharger bearing block, which is regard as the foundation excitation for turbocharger rotor dynamics, can be determined by the proposal method. Source

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