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2009 11th IEEE International Conference on e-Health Networking, Applications and Services, Healthcom 2009

作者： Wang, Yuekai Wu, Xiaofeng Song, Xiaoying Zhang, Wenqiang Weng, Juyang State Key Lab. of ASIC and System Fudan University Shanghai 200433 China Department of Electronic Engineering Fudan University Shanghai 200433 China School of Computer Science Fudan University Shanghai 200433 China Dept. of Computer Sci. and Eng. Michigan State University East Lansing MI 48824 United States

Generic object recognition is one of the most important fields in the artificial intelligence. Some cortex-like networks for generic object recognition are proposed these years. But most of them concentrated on the discussion about the recognition performance (such as recognition rate, number of objects to be recognized), not the practicability, i.e., implementation with ubiquitous devices and application in real time. This paper reports a try on implementation of a biologically-inspired where-what network (WWN), which integrates object recognition and attention in a single network, via parallelizing the various stages of the network training with CUDA on GPU to shorten the training time. The experiment on HAIBAO Robot exhibited in 2010 Shanghai Expo shows that this optimization can achieve a speedup of almost 16 times compared to the C-based program on an Intel Core 2 DUO 3.00 GHZ CPU in real environments. © 2012 Springer-Verlag GmbH.

关键词： Object recognition

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Skull-closed autonomous development: Object-wise incremental learning

Skull-closed autonomous development: Object-wise incremental...

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9th International Symposium on Neural Networks, ISNN 2012

作者： Wang, Yuekai Wu, Xiaofeng Weng, Juyang State Key Lab. of ASIC and System Fudan University Shanghai 200433 China Department of Electronic Engineering Fudan University Shanghai 200433 China School of Computer Science Fudan University Shanghai 200433 China Dept. of Computer Sci. and Eng. Michigan State University East Lansing MI 48824 United States

ISBN: (纸本)9783642313455

The series of Where-What Networks (WWNs) is a brain-inspired developmental model that simulates the dorsal (where) stream and the ventral (what) stream that converge to the motor area in the frontal cortex. Since developmental learning is always incremental, the order of different stimuli should affect the outcome of learning. In contrast to the uniform distribution of stimuli across image frames used in prior WWN experiments, this work studies non-uniform distribution in the sense that during training one object is presented at all the image locations before another object is presented. A new mechanism called cell regenesis is introduced to enable a less-often used cell to recommit its neuronal resource to new stimuli. The experimental results shown in this paper indicate that WWN-6 can deal with object-wise incremental learning. © 2012 Springer-Verlag.

关键词： Computer vision

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A dynamic programming algorithm for QoS-aware replica placement in distributed caching systems

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Journal of Convergence Information Technology 2012年第12期7卷 226-234页

作者： Wang, Biyao Wang, Jinlin Liu, Xue The Key Lab of Network Communication System and Control The Chinese Academy of Sciences The Key Lab of Network Communication System and Control Anhui Department of Automation University of Science and Technology China National Network New Media Engineering Research Center Institute of Acoustics Chinese Academy of Sciences China

The rapid growth of new information services, especially like new media services, providing content distribution to clients with good quality of service(QoS) while retaining efficient is a great challenge. This paper investigates the QoS-aware replica placement problem (QRPP) for distributed caching system. We propose a dynamic programming algorithm for the problem in general graph, it first ensures the QoS requirement is satisfied of each request, then places the replica along the request forward path to minimize the total cost. The simulation results show the dynamic programming algorithm can achive a good balance between the access latency and the requested availability. When the request is more concentrated, the dynamic programming algorithm can have better performance than the MODULO and LRU both in access latency and requested availability.

关键词： Dynamic programming

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Design and evaluation of an IDMA cooperative relay free-space optical system

Design and evaluation of an IDMA cooperative relay free-spac...

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2011 International Conference on Space Optical systems and Applications, ICSOS'11

作者： Fan, Jingyuan Zhou, Xiaolin Liu, Jun State Key Laboratory of ASIC and System Department of Communication Science and Engineering Fudan University Shanghai 200433 China

ISBN: (纸本)9781424496853

In this paper, we illustrate our attempt in an effective method of free space optical (FSO) communications. Firstly, a pulse-position modulated (PPM) optical interleave-division multiple-access (OIDMA) system is designed. Secondly, to alleviate the degrading effects of atmospheric turbulence, cooperative relay technique is adopted by OIDMA for achieving spatial diversity and robust transmission performance. Thirdly, to study the convergence behavior of the proposed relay-assisted optical PPM-OIDMA system, extrinsic information transfer (EXIT) charts are analyzed. By deriving the trajectories of the exchanged extrinsic information from EXIT charts, the time of iterations required for convergence can be easily predicted. The effects of scintillation, thermal noise, background noise and multi-user interference have been taken into consideration. © 2011 IEEE.

关键词： Atmospheric turbulence

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Compensation of quadrature imbalance in an optical coherent OQPSK receiver in presence of frequency offset

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Frontiers of Optoelectronics 2011年第3期4卷 288-291页

作者： Xinying LI Bo HUANG Yufeng SHAO Junwen ZHANG Shumin ZOU Wuliang FANG Li TAO Jiangbo ZHU Chi NAN Department of Communication Science and Engineering State Key Laboratory of Application Specific Integrated Circuit (ASIC) and SystemFudan University

In this paper, we describe the impact of quadrature imbalance(QI) in the presence of frequency offset in an optical coherent offset quadrature phase shift keying(OQPSK) receiver. Arbitrary conjugate misalignment was realized in a 2×4 90° optical hybrid, and the ellipse correction(EC) method of quadrature imbalance was applied in our simulation. In the case of transmission,the EC method can significantly improve the system performance.

关键词： offset quadrature phase shift keying (OQPSK) quadrature imbalance (QI) ellipse fitting frequency offset

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An interleaver-based atmospheric optical multiple access scheme: Capacity and BER performance

An interleaver-based atmospheric optical multiple access sch...

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2011 International Conference on Space Optical systems and Applications, ICSOS'11

作者： Zhang, Weiwei Zhou, Xiaolin Weijie Shen State Key Laboratory of ASIC and System Department of Communication Science and Engineering Fudan University Shanghai 200433 China

ISBN: (纸本)9781424496853

In this paper, a turbo-coded optical interleave-division multiple-access (OIDMA) scheme is studied. A maximum a posteriori (MAP) based asynchronous on-off keying (OOK) MUD algorithm is proposed. Besides, system capacity is analyzed with an iterative technique called SNR evolution. BER is evaluated over log-normal turbulence channels, taking into consideration the effects of thermal noise and background noise. Simulation results show that the proposed OIDMA scheme has good convergence property and low BER performance. Moreover, the related interleaver-based iteration MUD algorithm is quite robust in the asynchronous scenarios. © 2011 IEEE.

关键词： Signal to noise ratio

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A novel scheme for seamless integration of ROF system with OFDM-CPM WDM passive optical network

A novel scheme for seamless integration of ROF system with O...

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

A novel scheme to generate, transmit and receive an optical OFDM-CPM signal in the architecture for seamless integration of ROF system with 4 2.5Gb/s WDM-PON is proposed and experimentally validated. © 2011 Optic... 详细信息

ISBN: (纸本)9781457702136

关键词： Passive optical networks

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A modulation scheme for 100Gb/s Minimum-Shift keying format based on imbalanced bias in IQ components

A modulation scheme for 100Gb/s Minimum-Shift Keying format ...

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作者： Tao, Li Shao, Yufeng Zhang, Junwen Zhu, Jiangbo Chi, Nan Department of Communication Science and Engineering State Key Lab of ASIC and System Fudan University Shanghai 200433 China

We propose an optical MSK modulation scheme to achieve the 100Gb/s MSK signal with constant envelope and continuous temporal phase shift. The investigation on the transmission performance clearly demonstrates the feas... 详细信息

ISBN: (纸本)9781457702136

关键词： Phase shift keying

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Seamless Integration of RZ-DPSK-DWDM Optical Links with MIMO-OFDM system for 4th Generation Wide-Area Coverage Mobile communication

Seamless Integration of RZ-DPSK-DWDM Optical Links with MIMO...

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2011 International Conference on Future Wireless Networks and Information systems(ICFWI 2011)

作者： Yufeng Shao Yuanquan Wang Nan Chi State Key Lab of ASIC & System and Department of Communication Science and engineeringFudan University

We introduce 10×10Gb/s RZ-DPSK-DWDM links in the architecture integration of MIMO-OFDM *** optical communication performance and wireless communication performance is analyzed in the integrated *** long distance transmission for RZ-DPSK WDM is done,and the demodulated RZ-DPSK signal is transformed to the binary data,which is given to MIMO-OFDM-QPSK wireless communication *** MIMO-OFDMQPSK wireless system is designed with two transmit antennas and one receive antenna and four transmit antennas and one receive *** BER performance of almost 10-3 is achieved at SNR of 11 d B with four transmit antennas and one receive antenna which is better as compared to two transmit antennas and one receive *** results prove that seamless integration of RZ-DPSK-DWDM optical links with MIMO-OFDM system is suitable to simultaneously offer higher receiver performance and simplify system configuration for 4th generation wide-Area coverage mobile communication.

关键词： DWDM,RZ-DPSK,MIMO,OFDM,4G

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Compensation of Quadrature Imbalance in an Optical Coherent OQPSKReceiver in the presence of Frequency Offset and Phase Drift

Compensation of Quadrature Imbalance in an Optical Coherent ...

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全国第15次光纤通信暨第16届集成光学学术会议

作者：李欣颖 Yufeng Shao Bo Huang Junwen Zhang Shumin Zou Wuliang Fang Li Tao Jiangbo Zhu 迟楠 Department of Communication Science and Engineering State Key Lab of ASIC ＆ SystemFudan University

＜正＞In this letter,we describe the impact of quadrature imbalance（QI） in the presence of frequency offset and phase drift in an optical coherent offset-quadrature phase-shift-keying（OQPSK） *** the time domain,QI tilts and squeezes the square constellation into a diamond ***’ more,frequency offset continuously rotates the *** the presence of both QI and frequency offset,the constellation becomes *** conjugate misalignment was realized in a 2×4 90°optical hybrid, and the Gram-Schmidt orthogonalization procedure（GSOP） was applied in our simulation to compensate for quadrature imbalance in the ***,the GSOP enabled a set of nonorthogonal samples to be transformed into a set of orthogonal ***,a time domain method was adopted to compensate for chromatic dispersion（CD） due to fiber ***,the frequency offset between the received optical signal and LO signal,which was 200MHz in our simulation,was estimated and corrected by the phase increment estimation ***,we recovered the ideal square constellation after carrier phase estimation.

关键词： OQPSK Quadrature imbalance Frequency offset Phase drift

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