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Huang G.,Northeast Petroleum University | Li J.-R.,Harbin Research Institute of Electrical Instruments | Wu X.-Y.,Daqing Petrochemical Company
Proceedings of 2nd International Conference on Computer Science and Network Technology, ICCSNT 2012 | Year: 2012

This paper focuses on the research of the mapping between heterogeneous data models. And using ETL framework as references, it designs a bidirectional mapping strategy combining heterogeneous data model data mapping, conversion and loading. It analyzes and defines the mapping relations and mapping rules among the data models. Based on the metadata driven theory method, it designs the data mapping element model, and classifies the mapping relations to simple mapping and compound mapping according to the different complexities, with clearly giving the classification principle. This article also describes the bidirectional mapping relations, and analyzes the problems occurring in the bidirectional mapping. © 2012 IEEE. Source


Zhang Y.,Heilongjiang University | Zhang Y.,Harbin University of Science and Technology | Li Y.,Harbin Research Institute of Electrical Instruments | Wang X.,Harbin University of Science and Technology | Qiu C.J.,Heilongjiang University
Materials Letters | Year: 2014

Polyphosphazene with double electro-optic (EO) molecules was synthesized. One kind of the chromophoric group (carbazole nitro-azobenzene) was grafted to the polymer main chain by a chemical method to form the side chain EO polymer (carbazole polyphosphazene grafted with 2,4-dinitroaniline). Then, another small nonlinear optical molecule (NLO), ethyl 4-(dimethylamino) benzoate (EDB), was mixed into the polymers by a physical method for further improvement of EO properties. The structure of the material was characterized and the effect on the EO coefficient of different mixing proportions was investigated. Experimental results show that the material has fine stability and its enhanced EO coefficient is 40.5 pm/V. Thin films formed by this polymer material were used to detect terahertz (THz) radiation. It is found that the detecting efficiency and the spectrum sensitivity are enhanced largely compared with inorganic crystals, which makes the polymer material a good candidate for THz application. © 2014 Elsevier B.V. Allrightsreserved. Source


Qin D.,Heilongjiang University | Ma L.,Harbin Institute of Technology | Xu R.,Harbin Research Institute of Electrical Instruments | Ding Q.,Heilongjiang University
High Technology Letters | Year: 2014

The negative impact on communication performance in wireless multi-hop communication network caused by limited bandwidth, high bit error rate (BER), fading, noise and interference is alleviated by an adaptive filtering game based on frequency subbands selection and predetermined threshold. Such threshold is being obtained in Gaussian and multipath fading channel according to the frequency-matching principle and BER performance. The dynamic selection of subbands will obtain high use efficiency without the help of frequency hopping, and propound a new thought to improve band limited communication for wireless multi-hop communication network. The effectiveness of the adaptive filtering method has been verified by interleaving spread spectrum orthogonal frequency division multiplexing (ISS-OFDM) in different interference conditions, and the simulating results based on network simulator 2 (NS2) indicate that system BER can be improved greatly. Copyright © by HIGH TECHNOLOGY LETTERS PRESS Source


Ying Z.,Harbin University of Science and Technology | You L.,Harbin University of Science and Technology | You L.,Harbin Research Institute of Electrical Instruments
Materials Letters | Year: 2015

Polymethyl methacrylate (PMMA) with double electro-optic (EO) molecules was synthesized. One kind of chromophoric groups, hydroxyethyl carbazole, reacted with PMMA by a chemical method to form poly(methacrylic acid ethyl carbazole ester). Another small nonlinear optical molecule (NOL), 4-6-alkoxy-4′-cyano-biphenyl (6OCB), was mixed into the polymers by a physical method to further improve EO properties. The structure of the material was characterized and the effect on EO coefficient of different mixing proportions was investigated. Photoconductive properties and the orientation stability were studied. Experimental results showed that the enhanced EO coefficient was 44.8 pm/V when the mixing proportion was 20 wt%. Thermally stimulated discharge current (TSDC) testing curves were obtained, which confirmed the existence of two depolarization processes. Thin films formed by this polymer material were used to detect terahertz (THz) radiation. The detecting efficiency and the spectrum sensitivity were enhanced largely compared with ZnTe crystal. It can be concluded that this polymer material is a very good candidate for THz application. © 2015 Elsevier B.V. Source


Fan X.,Henan Polytechnic University | Yu J.,Harbin Research Institute of Electrical Instruments | Wang H.,Tangshan College
Advanced Materials Research | Year: 2011

The 15 degrees of nonlinear dynamic vehicle model is established, and then Dugoff and magic formula tire model are studied by comparison. Then the braking system dynamics model and the side-slip angle estimation algorithm are discussed. Stability control system is established based on the control target of combined yaw and side-slip angle with linear 2-dof vehicle handling characteristics model. It shows that control system can perfectly control vehicle driving and can improve the stability of car active safety through the serpent's simulation test. © (2011) Trans Tech Publications, Switzerland. Source

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