Harbin Research Institute of Electrical Instruments

Harbin, China

Harbin Research Institute of Electrical Instruments

Harbin, China
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Qin D.,Heilongjiang University | Xu R.,Harbin Research Institute of Electrical Instruments | Ma L.,Harbin Institute of Technology | Ding Q.,Heilongjiang University
Sensors and Transducers | Year: 2013

Wireless multihop communication network is an important part of modern communication network, because of its flexible forms of networking, not relying on any fixed infrastructure to achieve network connectivity and data transfer, but through the mobile nodes' collaboration and self-organization. The negative impact of network partitions on the availability of key management services in wireless multihop communication network will be alleviated by a robust key management scheme based on the traditional distributed certificate authority (DCA) proposed in this paper. Auxiliary shares are used to increase the redundancy of shares in the networks thereby ensuring robustness and security at the same time. Simulating results show that the average failure ratio for DCA requests is reduced by more than 5 %, and the successful rate of establishing secure link is greatly improved. Security analysis and simulations show that the approach ensures system robustness and thwarts common attacks. © 2013 IFSA.


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.


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


Qin D.,Heilongjiang University | Yang C.,Harbin Research Institute of Electrical Instruments | Ma L.,Harbin Institute of Technology | Ding Q.,Heilongjiang University
Journal of Computational Information Systems | Year: 2012

One of the critical challenges for mobile ad hoc network is the design of efficient routing algorithms which are able to provide high bandwidth utilization and desired fairness in a mobile wireless environment without any fixed communication establishments. While extensive efforts have already been devoted to providing optimization based, distributed stability and reliability for efficient bandwidth and fair allocation in both wired and wireless networks, a common assumption therein fixed link capacities, which will unfortunately limit the application scope in MANET. In this paper, a routing algorithm based on ant colony scheme has been proposed and evaluated to reduce the overhead and enhance the network stability for MANET. The thought of design came into being based on the way of ants foraging and work dividing. With a global correction on pheromone intensity, we gain a more efficient routing selection mechanism. Simulation results based on NS-2 show that the routing algorithm with a global correction proposed in this paper, compared with AODV, can not only reduce the average end-to-end delay, but also enhance the stability and raise the efficiency of communication for MANET. 1553-9105/Copyright © 2012 Binary Information Press.


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.


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.


Cong C.,Harbin Research Institute of Electrical Instruments | Hu Q.,Inner Mongolia Electrical Power Research Institute | Wang H.,Harbin Research Institute of Electrical Instruments
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2015

This paper introduces the adaptive step intermittent chaotic oscillator for the first time to solve the problems of low resolution of close frequency and interharmonics and weak anti-noise ability, and describes two means for estimating frequency. The method of using intermittent chaotic oscillator for frequency estimation is proposed. Besides a simplified method of sine signal amplitude and phase is put forward which is based on phase jump chaotic oscillator for estimating the amplitude and phase of harmonic and interharmonics. Finally, a simulation result of a analog signal is used for verifying the availability and accuracy of the detection and estimation method proposed. ©, 2015, Power System Protection and Control Press. All right reserved.


Wang H.-W.,Harbin Research Institute of Electrical Instruments | Cong C.,Harbin Research Institute of Electrical Instruments
Tien Tzu Hsueh Pao/Acta Electronica Sinica | Year: 2016

In order to give a complete signal detection and estimation method based on Duffing system,this paper uses the coupling Duffing oscillator,and introduces the variable scale method,to detect and estimate the sinusoidal signal with unknown frequency and arbitrary phrase just by one Duffing oscillator.Besides,this paper puts forward a simplified method which is based on chaotic oscillator for estimating the amplitude and phase of the signal to be measured,and integrated method principle and the simulation experiment result proves that this method has high estimation precision,strong ability to resist noise interference and the advantages of good real-time performance.Finally,using a simulation result of a analog signal for verifying the availability and accuracy of the detection and estimation method is proposed. © 2016, Chinese Institute of Electronics. All right reserved.


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.


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: 2016

A new synthetic method by doping two kinds of chromophoric groups into polyphosphazene was reported in this paper. One kind of the chromophoric group (phenol nitro azobenzene) was grafted to the polymer by chemical method for polar improvement of the main chain, and the product was phenol polyphosphazene grafted by paranitroaniline. Then another small nonlinear optical molecule (NOL) was mixed into the polymer by physical method for further improvement of EO property. Here ethyl 4-(dimethylamino) benzoate (EDB) and 4-6-alkoxy-4′-cyano-biphenyl (6OCB) were selected respectively. The effect on EO coefficient by different mixing proportion was investigated and the test of the sample orientation stability was performed. Experimental results show that the material possesses not only high EO coefficient but also fine phase stability. The enhancement of EO property by EDB mixing is more obvious than that by 6OCB and the maximum value of EO coefficient can be 52.2 pm/v. Finally, the polymer thin films were used to detect terahertz (THz) radiation. It is found that the detecting efficiency and the spectrum sensitivity are enhanced largely compared with conventional inorganic crystal. © 2016 Elsevier B.V. All rights reserved.

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