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International Journal of Signal Processing, Image Processing and Pattern Recognition 2016年第7期9卷 407-424页

作者： Li, Jizheng Diao, Ming School of Information and Communication Engineering Harbin Engineering University Harbin150001 China Heilongjiang Province Key Lab of Measurement-Control Tech and Instrument Harbin University of Science and Technology Harbin150080 China

In cooperative relay networks with multiple users and multiple potential relays, which relay nodes are selected has great impact on the system performance. It is an optimization problem for selecting suitable relay nodes. The exhaustive search can solve this problem but the complexity will increase factorially with the network size, i.e., the number of users and the number of relays in the network. In this paper, we formulate both single-objective and multi-objective relay selection problems. For single-objective relay selection problem, only one system objective is considered. A novel quantum bee colony optimization (QBCO) based relay selection scheme is proposed. For multi-objective relay selection problem, two contradictive objectives are considered simultaneously. A novel non-dominated sorting quantum bee colony optimization (NSQBCO) based relay selection scheme is proposed. Simulation results show that the proposed relay selection schemes have the ability to find global optimal solution but have less computational complexity compared with exhaustive search scheme. © 2016 SERSC.

关键词： Problem solving

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The impact of hardened steel milling surface structure on mould service load

The impact of hardened steel milling surface structure on mo...

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6th International Conference on High Speed Machining, ICHSM 2014

作者： Zheng, Min Li Xu, Jin Hui Zhang, Wei Zhang, Zhao Xing Wu, Tong College of Mechanical and Power Engineering Harbin University Science And Technology Harbin Heilongjiang province 150080 China Measurement-control Technology and Instrument Key Lab. of Universities in Heilongjiang province Harbin University Science And Technology Harbin Heilongjiang province 150080 China

ISBN: (纸本)9783038351429

Mould surface loading state is one of the most important factors which would affect the mould performance in the course of service. According to the established hardened steel milling surface geometry model, a bending forming numerical simulation of hardened steel milling is conducted, the influence law of service process surface load state is analyzed under machined surface geometry structure which is formed by different milling parameters. The research results show: surface load concentrated area is mainly focusing on mould edge transition and fillet in the course of service;the surface geometry structure has an important influence on the mould service load in the course of service, service load more smaller which is more helpful to improve the mould service performance in the course of service. © (2014) Trans tech Publications, Switzerland.

关键词： Surface structure

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Analysis of microscopic damage of hardened steel milling surface on mould service process

Analysis of microscopic damage of hardened steel milling sur...

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6th International Conference on High Speed Machining, ICHSM 2014

作者： Zhang, Wei Xu, Jin Hui Zheng, Min Li Liu, Hong Li Wu, Tong College of Mechanical and Power Engineering Harbin University Science And Technology Harbin Heilongjiang province 150080 China Measurement-control Technology and Instrument Key Lab. of Universities in Heilongjiang province Harbin University Science And Technology Harbin Heilongjiang province 150080 China

ISBN: (纸本)9783038351429

The service performance is seriously effected by milling machined surface integrity of auto hardened steel mould. Basing on the microscopic damage evolution theory and hardened steel mould material micro-voids cell model, according to the service process load condition of hardened steel milling machined surface, surface microscopic damage evolution analysis had been conducted, surface evolution characteristics was obtained of different shapes of void cell. Through comparative analysis the change law of damage evolution internal variable of different shapes of void cell can know: respect to the ideal spherical when the change of void volume fraction and the degree of matrix material yield were considered, the oblate hole more faster and the prolate hole more slower, which would provide a further prediction for surface damage. © (2014) Trans tech Publications, Switzerland.

关键词： Molds

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Constructing reliability analysis model of complex systems based on FMEA-FTA-BN

Constructing reliability analysis model of complex systems b...

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作者： Ma, De Zhong Ding, Wen Fei Jiang, Yong Qing Zhou, Zhen College of Measurement-control Technology and Communications Engineering Harbin University of Science and Technology Harbin China The Higher Edu. Key Lab. for Measuring and Ctrl. Tech. and Instrumentations of Heilongjiang Province Harbin China Electronic Information Engineering Institute Harbin Huade University Harbin China

ISBN: (纸本)9783038351221

In order to solve the difficulties existing in course of complex system reliability modeling, a novel method was proposed in this paper. According to the analysis sequence, from FMEA to FTA to BN, a BN can be constructed by making full use of the helpful information in the results of FMEA and FTA. The reliability of complex system can be analyzed based on uncertainty-expression ability and bidirectional-reasoning ability of BN. For demonstrating the effectiveness of this method, aim at the failures of gears in wind turbine gearbox, a BN for system reliability analysis was constructed. © (2014) Trans tech Publications, Switzerland.

关键词： Fault tree analysis

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Research of high altitude meteorological detection system based on GPRS/GPS

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International Journal of Advancements in Computing technology 2012年第22期4卷 616-624页

作者： Luo, Yi Shi, Yunbo Shang, Chunxue Qiu, Yang The Higher Edu.Key Lab for Measuring and Control Tech Instrumentation of Heilongjiang Province Institute of Measurement- Control Technology and Communications Engineering Harbin University of Science and Technology Harbin 150080 China

Aiming at the shortcomings of data transmission and locating method in high altitude meteorological detection system, combined with technology needs of high altitude meteorological detection, a high altitude meteorological detection system has been described which is based on GPRS/GPS, a method of meteorological data transfer and storage has been discussed, the relevant ground and aloft testing experiments have been carried out, and the experimental data have been analyzed and processed by Matlab. The system uses STC12 series single chip as terminal system, after analysising and processing of GPS and meteorological data that collected by system through the terminal system, return to the ground monitoring center through the GPRS, and the ground monitoring center completed data storage, data curve analysis and processing, etc. Experiments show that, compared with high altitude meteorological detection system based on the l-band, the system has characteristics as high speed of data transmission, high efficiency and reliability, the data does not have lost, low cost of equipments. The meteorological data transfer and storage method is effective to solve the low GPRS signal quality caused by too high work height, thus lead to the problem of data leak and misinformed.

关键词： Data transfer

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Research on the broadband power line communication system based on adaptive OFDM

Research on the broadband power line communication system ba...

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International Conference on Consumer Electronics, Communications and Networks

作者： Xuhui, Zhang Junfeng, Jia Yingjie, Zhao Jiaxin, Wei Higher Educ. Key Lab. for Measuring and Control Technology and Instrument of Heilongjiang Province Measurement-Control and Communication Institute Harbin University of Science and Technology Harbin 150080 China

ISBN: (纸本)9781612844572

There are characteristics of high noise, big attenuation, the big impedance variation and the uneven frequency response on low-voltage power line channel. Firstly, this paper proposes the combination the adaptive technology with the OFDM technology to realize the reliable and high-speed data transmission channel. It is a key to study the channel estimation of the OFDM technology and the channel allocation of the adaptive technology. Then, we put forward to the algorithm of comb-type pilots Unscented Kalman Filter, and we use the time-frequency domain estimation algorithm to improve the channel estimation accuracy. Lastly, we take the improving particle swarm algorithm to solve the problem of the channel allocation and the bit allocation, realize the sub-carrier bits and the power allocation in multiuser adaptive OFDM system, save running time, reduce the transmitted power and enhancing the efficiency of spectrum. © 2011 IEEE.

关键词： Channel estimation

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Optimum technique for PAPR Reduction in Digital Multimedia Broadcasting System

Optimum Technique for PAPR Reduction in Digital Multimedia B...

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2006 8th International Conference on Signal Processing

作者： Mingzhu Liu Xinyuan Yang Qi Yu School of Information and Communication Engineering Harbin Engineering University Heilongjiang Province Key Lab of Measurement-Control Tech & Instrument Harbin University of Science and Technology Department of Technology Heilongjiang Broadcasting Station

This paper presents a new peak-to-average power ratio(PAPR) reduction method to optimize TDS-OFDM signals in DMB-T ***-OFDM modulation induces high crest factors of the signals in time domai

ISBN: (纸本)0780397371

This paper presents a new peak-to-average power ratio(PAPR) reduction method to optimize TDS-OFDM signals in DMB-T ***-OFDM modulation induces high crest factors of the signals in time domai

关键词： Peak to average power ratio Digital multimedia broadcasting OFDM modulation Radio frequency Partial transmit sequences Frequency synchronization Multimedia communication Bit error rate Digital video broadcasting Power engineering and energy

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