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The 8th World Congress on Intelligent Control and Automation(第八届智能控制与自动化世界大会 WCICA 2010)

作者： Dong Zheng Lin Xu Yumei Kang Bing Shi Liye Yu Faculty of Information Science and Engineering Northeastern University ShenYang 110004 China School of Resource & Civil Engineering Northeastern University ShenYang 110004 China Engineering Design CO. LTD HuaDianXingCheng of BeiJing BeiJing 100055 China Hybrid Process Industry Automation System and Equipment Technology State Key Lab Beijing 100070 Chi

Acoustic emission technology, one of nondestruction testing methods, occupies a significant position in failure diagnosis field. And one key issue to signal processing in acoustic emission is how to denoise the signals collected in acoustic emission system. However, with traditional wavelet methods applied, the acoustic emission signals overlapping spectrum with original ones raise serious problems to optimum filtering. According to this problem, a Least Mean Square (LMS) adaptive filter model based on wavelet analysis is established, combining LMS adaptive filtering thesis and wavelet analysis together. This module realizes noise reduction or elimination to real-time monitoring signal, increases Signal-to-Noise Ratio (SNR) obviously, and achieves optimum result of signal-noise separation. Series of application experiments of acoustic emission signal processing on rock-like materials indicate the effectiveness of this denoising method.

关键词： Adaptive filters Wavelet analysis Noise Least squares approximation Wavelet transforms Noise reduction Testing

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Hybrid information retrieval policies based on cooperative cache in mobile P2P networks

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中国高等学校学术文摘·计算机科学 2009年第3期3卷 381-395页

作者： Quanqing XU Hengtao SHEN Zaiben CHEN Bin CUI Xiaofang ZHOU Yafei DAI State Key Lab for Advanced Optical Communication System & Networks Peking University Beijing 100871 China School of Information Technology and Electrical Engineering The University of Queensland Brisbane Australia

The concept of Peer-to-Peer (P2P) has been in-troduced into mobile networks, which has led to the emer-gence of mobile P2P networks, and originated potential ap-plications in many fields. However, mobile P2P networks are subject to the limitations of transmission range, and highly dynamic and unpredictable network topology, giving rise to many new challenges for efficient information retrieval. In this paper, we propose an automatic and economical hybrid information retrieval approach based on cooperative cache. In this method, the region covered by a mobile P2P network is partitioned into subregions, each of which is identified by a unique ID and known to all peers. All the subregions then constitute a mobile Kademlia (MKad) network. The pro-posed hybrid retrieval approach aims to utilize the flooding-based and Distributed Hash Table (DHT)-based schemes in MKad for indexing and searching according to the designed utility functions. To further facilitate information retrieval, we present an effective cache update method by considering all relevant factors. At the same time, the combination of two different methods for cache update is also introduced. One of them is pull based on time stamp including two different pulls: an on-demand pull and a periodical pull, and the other is a push strategy using update records. Furthermore, we provide detailed mathematical analysis on the cache hit ratio of our approach. Simulation experiments in NS-2 showed that the proposed approach is more accurate and efficient than the existing methods.

关键词： peer-to-peer (P2P) flooding mobile Kadem-lia hybrid information retrieval cache update cache con-sistency

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Haptic-visual interaction training system for refueling aircraft

Haptic-visual interaction training system for refueling airc...

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2009 2nd International Conference on Biomedical Engineering and Informatics, BMEI 2009

作者： Liu, Guanyang Zhou, Wanlin Muli, Liu Wang, Ju State Key Lab of Virtual Reality Technology and System Beihang University Beijing China

ISBN: (纸本)9781424441341

The goal of this paper is to develop haptic-visual interaction training system for aircraft fuel supply simulation. Operators can use this system to simulate refueling aircraft in virtual environment with tactile and visual feedback. The simulator is built based on haptic device Omega 3DOF. Hardware and software are discussed to meet the requirement of training simulation. Experiment results show that the system can provide stable simulation of aircraft refueling operation. ©2009 IEEE.

关键词： Virtual reality

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A neural-network based technology of data distribution management in distributed virtual environment

A neural-network based technology of data distribution manag...

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2009 International Conference on Computational intelligence and Software Engineering, CiSE 2009

作者： Zhang, Jiong Lei, Xiaoyong Dai, Shuling Chen, Na State Key Lab. of Virtual Reality Technology and System BeiHang University Beijing 100191 China

ISBN: (纸本)9781424445073

In Distributed Virtual Environment many methods of Data Distribution Management (DDM) are presented to efficiently improve network traffic situation and save system resources? these technologies are based on virtual environment partition. The grid size of the partition affects the data distribution results. This paper aims to present a Neural-Network based study mechanism, which adjusts the grid size dynamically in the virtual environment. The simulation results indicate that by using this technique, better experimental results and practicability were achieved regardless the DDM used. And there is a significant improvement in system scalability. ©2009 IEEE.

关键词： Virtual reality

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Study on dynamic spectrum allocation and parameters cross-layer optimization of cognitive radio network

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Beijing Gongye Daxue Xuebao/Journal of Beijing University of technology 2010年第SUPPL. 1期36卷 64-69页

作者： Zhao, Zhi-Jin Peng, Zhen Wang, Hai-Quan Zheng, Shi-Lian Telecommunication School Hangzhou Dianzi University Hangzhou 310018 China State Key Lab. of Information Controlling Technol. in Communications System of No.36 Research Inst. China Electronic Technology Corporation Jiaxing 314033 Zhejiang China

The dynamic characteristic of the spectrum needs cognitive radio parameters must be dynamically adjusted, which makes the cross-layer design of cognitive wireless network has become necessary. This paper proposes a structure of cross-layer optimization and cross-layer optimization algorithm based on co-evolutionary particle swarm optimization, which combines cognitive radio dynamic spectrum allocation and parameters cross-layer optimization. Simulation results show that the algorithm can not only allocate the spectrum dynamically, but also has good performance of cross-layer optimization.

关键词： Cognitive radio

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InP-based micro-disc lasers using non-concentric hole as mode control and light extraction mechanism

InP-based micro-disc lasers using non-concentric hole as mod...

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Asia Communications and Photonics Conference and Exhibition(2010亚洲光纤通信与光弹博览会及研讨会 ACP 2010)

作者： Bei Li Xinlun Cai Gabor Mezosi Marc Sorel Zhuoran Wang Jiangbo Zhu Nan Chi Siyuan Yu Dept.of Electronic and Electrical Engineering University of Bristol BS8 1UB Bristol UK Dept.of Electronics and Electrical Engineering University of Glasgow G12 8LT Glasgow UK School of Optoelectronic Information University of Electronic Science and Technology of China State Key lab of ASIC & System Dept.of Communications Science and Engineering Fudan University Sh Dept.of Electronic and Electrical Engineering University of Bristol BS8 1UB Bristol UK State Key

We demonstrate electrically-pumped roomtemperature continuous-wave lasing in InP-based micro-disc lasers with threshold current of 6.5mA. A non-concentric hole inside the disc is used to extract the light and control ... 详细信息

关键词： Laser modes Semiconductor lasers Threshold current Measurement by laser beam Cavity resonators Couplings Laser theory

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The improvement of Transmission Properties for Multi-Mode Fiber based on Launching Optical Field Shaping and Feedback Equalization

The improvement of Transmission Properties for Multi-Mode Fi...

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Passive Components and Fiber-based Devices VI

作者： Fang, Wuliang Zhang, Junwen Shao, Yufeng Huang, Bo Chi, Nan Department of Communication Science and Technology Fudan University State Key Lab of ASIC and System Shanghai 200433 China

ISBN: (纸本)9780819480323

Recently, as the continual development of services and needs, people have a higher expectation on the optical communication system especially the passive optical network (PON). Deciding which kind of fiber to be the optimal media for PON is becoming a critical problem. This paper analyzed the feasibility for the applying of multimode fiber (MMF) in the future long haul, high bit-rate, and large capacity PON, and summarized the strengths and weakness of MMF. Then, initiating from the waveguide theory in the weakly guiding fiber and neglecting the intra-modal dispersion as well as nonlinearity, we built a simple model for multimode fiber, based on which we made analysis, research and comparison through simulation experiments on some performance improving techniques of MMF: offset launching, mode size changing, ring launching and feedback equalization. The simulation results demonstrated that the combination of field shaping and feedback equalization can obviously improve the transmission properties of MMF, because of which, the 10Gbit/s data can travel in the MMF for more than 1km. © 2009 SPIE-OSA-IEEE.

关键词： Multimode fibers

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TACS: A transparent application bandwidth management system

TACS: A transparent application bandwidth management system

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IEEE 9th International Conference on Computer and Information technology, CIT 2009

作者： Chen, Xianqin Long, Xiang Gao, Xiaopeng Ma, Junjie State Key Lab. of Virtual Reality Technology and System School of Computer Science and Technology Beijing University of Aeronautics and Astronautics Beijing 100191 China

ISBN: (纸本)9780769538365

With the rapid advance of computer and network technology, more and more applications are deployed in the customer-side network. These applications require different quality of service (QoS), but have to share a few bandwidth limited internet connections. Owing to the IP network's best-effort delivery mechanism, the QoS requirements are hard to be satisfied. There have been plenty of QoS solutions in research and industry areas, however, few of them are easy to understand or to deploy. Therefore, we provide a solution, based on a simple and clear model, has the ability of transparently deployed at the inner side of customer's gateway device and controlled in the application-oriented way. We also introduce a straightforward QoS policy definition language to allow user to create QoS rules for various applications. We conduct the evaluation of our proto type system running upon mid-end industrial personal computer under both the lab testbed and the practical network. In the lab test, our system achieves 200Mbps throughput, in the practical field test, our system successfully manages a 100Mbps internet link for over 3000 active users. © 2009 IEEE.

关键词： Quality of service

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A Strategy for the Integration of Production Planning and Scheduling in Refineries under Uncertainty

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Chinese Journal of Chemical Engineering 2009年第1期17卷 113-127页

作者：罗春鹏荣冈 State Key Lab. of Industrial Control Technology Institute of Cyber System and Control Zhejiang University Hangzhou 310027 China

A strategy for the integration of production planning and scheduling in refineries is proposed. This strategy relies on rolling horizon strategy and a two-level decomposition strategy. This strategy involves an upper level multiperiod mixed integer linear programming （MILP） model and a lower level simulation system, which is extended from our previous framework for short-term scheduling problems [Luo, C.E, Rong, G, ＂Hierarchical apthis extended framework is to reduce the number of variables and the size of the optimization model and, to quickly find the optimal solution for the integrated planning/scheduling problem in refineries. Uncertainties are also considered in this article. An integrated robust optimization approach is introduced to cope with uncertain parameters with both continuous and discrete probability distribution.

关键词： refinery planning and scheduling optimization model simulation system

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Research on remote sensing image retrieval based on geographical and semantic features

Research on remote sensing image retrieval based on geograph...

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2009 International Conference on Image Analysis and Signal Processing, IASP 2009

作者： Wei, Li Wang, Weihong Lu, Feng Software College Zhejiang University of Technology Hangzhou China State Key Lab. of Resources and Environmental Information System CAS Beijing China

ISBN: (纸本)9781424439867

Based on geographical and semantic features of remote sensing image, the paper presents a universal remote sensing image data model, and analyzes the logical structure and storage methods of this model. Based on the model, the paper puts forward a remote sensing image retrieval method, and makes analysis of the process of remote sensing image retrieval. At last, on basis of computer and database technology, the method is tested;the test results confirm the validity of the approach. ©2009 IEEE.

关键词： Image retrieval

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