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6th International ICST Conference on Wireless Internet, WICON 2011

作者： Jiang, Lai Yu, Hang Wei, Rongchen Li, Yan Lin, Shengyue Ji, Zhen Shenzhen City Key Laboratory of Embedded System Design College of Computer Science and Software Engineering Shenzhen University 518060 Shenzhen China

ISBN: (纸本)9783642304927

Electronic tolling collection (ETC) system will be largely adopted in the next generation of Chinese highway network, and its operating frequency is specified to be 5.8 GHz. A limiting amplifier designed for the 5.8 GHz receiver of the ETC system is presented in this work. AC-coupled gain stage was realized to avoid additional offset cancellation mechanism. The trade-off between the small signal gain, number of stages, gain-bandwidth product, and power dissipation was studied by systematic analysis. Implemented using a standard CMOS 0.18 μm process, the simulation results show that the limiting amplifier achieves overall small signal gain of 81 dB, with 20 MHz bandwidth. © 2012 ICST Institute for computer Science, Social Informatics and Telecommunications engineering.

关键词： Bandwidth

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A tunable CMOS continuous-time filter designed for a 5.8 GHz ETC demodulator

A tunable CMOS continuous-time filter designed for a 5.8 GHz...

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6th International ICST Conference on Wireless Internet, WICON 2011

作者： Yu, Hang Jiang, Lai Lin, Shengyue Li, Yan Wei, Rongchen Ji, Zhen Shenzhen City Key Laboratory of Embedded System Design College of Computer Science and Software Engineering Shenzhen University 518060 Shenzhen China

ISBN: (纸本)9783642304927

5.8 GHz is specified as the operating frequency of the electronic tolling collection (ETC) system in the new national highway network in China. A low power, robust radio frequency receiver is the key design challenge in such a system. A 3rd order butterworth low-pass filter with tunable pass-band designed for the ETC receiver was presented in this work. The design is based on a single operational amplifier in order to reduce the overall power consumption. The filter was implemented in standard CMOS 0.18 μm technology. Simulation shows that the design achieves a maximum 3-dB bandwidth of 2 MHz with 0 dB insertion loss, while the power consumption is only ∼200μW. © 2012 ICST Institute for computer Science, Social Informatics and Telecommunications engineering.

关键词： Operational amplifiers

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Modeling, characterizing, and enhancing user experience in cloud mobile rendering

Modeling, characterizing, and enhancing user experience in c...

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2012 International Conference on Computing, Networking and Communications, ICNC'12

作者： Liu, Yao Wang, Shaoxuan Dey, Sujit Mobile System Design Lab. Dept. of Electrical and Computer Engineering University of California San Diego CA United States

ISBN: (纸本)9781467300094

Cloud Mobile Rendering (CMR), where compute intensive rendering is performed on cloud servers instead of on mobile devices, can be a promising approach to enable rich rendering based multimedia applications on battery and CPU constrained mobile devices. However, since the video rendered in the cloud has to be transmitted to the mobile device over a wireless network with fluctuating and constrained bandwidth, the resulting user experience can be impacted. In [9], an adaptive rendering approach was proposed, wherein multiple rendering factors can be adapted such that the bit rate of the encoded rendered video is compatible with the available network bandwidth. However, changing the rendering factors may itself have adverse impact on user experience, which has not been studied earlier. In this paper, we analyze the impairment of rendering factors on the quality of user experience, and combine the rendering impairments with impairments due to video encoding factors (like bit rate and frame rate) and network factors (like bandwidth and delay) to formulate a model to measure the user experience during a Cloud Mobile Rendering session. We term this model CMR-UE in this paper. We describe our method to derive the CMR-UE model, and demonstrate its accuracy through subjective testing using participants at UCSD. We use the CMR-UE model to study the trade-off between the impact of rendering and video encoding factors on user experience, and find the optimal rendering settings that maximize CMR-UE for any given network condition. Next, we use the CMR-UE model to measure user experience during CMR sessions on a live cellular network. We demonstrate how user experience can be significantly enhanced by using appropriate rendering settings under fluctuating network bandwidth conditions. © 2012 IEEE.

关键词： Encoding (symbols)

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A Novel Wideband CPW-Fed 5.8GHz RFID Tag Antenna

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电子学报(英文版) 2012年第2期21卷 202-208页

作者： LI Huihui MOU Xuanqin JI Zhen YU Hang LI Yan Institute of Image Processing and Pattern Recognition Xi'an Jiaotong University Xi'an 710049 China College of Computer Science and Software Engineering Shenzhen University Shenzhen 518060 China Shenzhen Key Laboratory of Embedded System Design Shenzhen 518060 China

A novel wideband 5.8GHz CPW-fed an- tenna is presented for Radio frequency identification (RFID) tag. Four U-shaped and four L-shaped branches are used as additional resonators to achieve wideband operation. The proposed antenna was analyzed numeri- cally using the Method of moment (MOM) and the Fi- nite element method (FEM). With the antenna size lim- ited to 30 × 30mm2, the ?10dB bandwidth obtained by MOM is 3.235GHz (5.765～9GHz) and the ?9.5dB band- width obtained by FEM is 2.74GHz (5.32～8.06GHz), cor- responding to 55.7% and 47.2% of the center frequency 5.8GHz respectively. Moreover, the simulated results show that the proposed antenna has gain of more than 4.8dBi and the radiation pattern is nearly omnidirectional in the H-plane. The measured ?10dB bandwidth is 2.68GHz (5.63GHz～8.31GHz), 46.2% of the 5.8GHz frequency. Fur- thermore, there are three measured resonant frequencies at 1.34GHz, 3.23GHz and 5.8GHz with lower than ?10dB return loss respectively. The measurement result achieves a wideband RFID tag antenna performance and is in good agreement with the calculated results.

关键词： RFID标签天线尺寸共面波导宽带无线电频率识别有限元分析网络连接数值分析

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A low power limiting amplifier designed for the RSSI of a 5.8 GHz ETC receiver

A low power limiting amplifier designed for the RSSI of a 5....

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International Conference on computer, Informatics, Cybernetics and Applications 2011, CICA 2011

作者： Yu, Hang Li, Yan Wei, Wongchen Jiang, Lai Lin, Shengyue Ji, Zhen Shenzhen City Key Laboratory of Embedded System Design College of Computer Science and Software Engineering Shenzhen University Shenzhen Guangdong 518060 China

ISBN: (纸本)9789400718388

A low power limiting amplifier designed for received signal strength indicator of a 5.8 GHz ETC receiver is presented in this chapter. systematic analysis is carried out first to determine the optimal number of gain stages and the gain-bandwidth product of each stage. Then the detailed circuit design is discussed. The limiting amplifier consists of twelve AC-coupled gain stages, and is implemented using the standard CMOS 0.18 μm technology. The design is validated under Zeni design environment, and the simulation results show that the limiting amplifier achieves overall small signal gain of 98 dB, with 22 MHz bandwidth. Powered by a 1.8 V DC supply voltage, the total power consumption of the limiting amplifier is only 5.5 mW. © 2012 Springer Science+Business Media B.V.

关键词： Bandwidth

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A 3rd order opamp-based tunable low-pass filter design for data demodulator of a 5.8 GHz ETC RF receiver

A 3rd order opamp-based tunable low-pass filter design for d...

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International Conference on computer, Informatics, Cybernetics and Applications 2011, CICA 2011

作者： Li, Yan Yu, Hang Lin, Shengyue Jiang, Lai Wei, Rongchen Ji, Zhen Shenzhen City Key Laboratory of Embedded System Design College of Computer Science and Software Engineering Shenzhen University Shenzhen Guangdong 518060 China

ISBN: (纸本)9789400718388

Electronic tolling collection (ETC) will be applied in the construction of the new national highway network in China and the Chinese standard has been released. A 5.8 GHz receiver satisfied the standard is one of the key components in the ETC system. In this work, a 3rd order low-pass filter was designed in a 0.18 μm CMOS process for the data demodulation block of the receiver. An operational amplifier was firstly realized and then a tunable low pass filter was designed based on the amplifier. Detailed simulation results are presented and the main design issues were discussed. © 2012 Springer Science+Business Media B.V.

关键词： Operational amplifiers

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design and implementation of load reduction system for mitigating flash crowds on web server

Design and implementation of load reduction system for mitig...

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2012 World Telecommunications Congress, WTC 2012

作者： Yokota, Kenji Takahashi, Tatsuro Asaka, Takuya Communications and Computer Engineering Graduate School of Informatics Kyoto University Kyoto Japan Faculty of System Design Tokyo Metropolitan University Tokyo Japan

ISBN: (纸本)9784885522574

Internet traffic at a given web server often increases sharply within a short time as the number of Internet users increases. This phenomenon is known as a flash crowd. When flash crowds occur in the web server, the response rate decreases, or the web server may crash as the load increases. We propose a load reduction system that prevents excessive accesses to the web server in order to stably deliver content without having to enhance the performance of the web server. In the proposed system, the web server detects flash crowds by monitoring the number of requests and changes its content delivery system. To limit excessive accesses, the web server redirects requests to other clients that hold the content in their cache when flash crowds occur. We implemented the proposed system and verified its efficiency through experiments. © 2012 IEICE Institute of Electronics Informati.

关键词： Web services

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A novel approach to modelling protein-protein interaction networks

A novel approach to modelling protein-protein interaction ne...

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3rd International Conference on Swarm Intelligence, ICSI 2012

作者： You, Zhuhong Lei, Yingke Ji, Zhen Zhu, Zexuan Shenzhen City Key Laboratory of Embedded System Design College of Computer Science and Software Engineering Shenzhen University Shenzhen 518060 China Department of Information Electronic Engineering Institute Hefei Anhui 230027 China

ISBN: (纸本)9783642310195

Finding an accurate network null model for protein-protein interactions (PPI) networks is an important and fundamental problem in today's systems biology. A number of graph models were introduced to model and analyze PPI networks. However, because the previous network models were developed to capture specific network properties or just mimic the way that real PPI network might have evolved, the whole connectivity information of PPI networks is not utilized to learn the topological structure of the networks. In this paper we propose a novel model for PPI networks which is based on geometric random graphs and employs the entire connectivity information of PPI networks to learn its structure. The computational experiments show the superiority of the fit of our method over five other network models to PPI data. Thus, the proposed network null model could facilitate further graph-based studies of protein-protein interactions and may help infer their hidden underlying biological knowledge. © 2012 Springer-Verlag.

关键词： Proteins

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design and Optimization of 99% CEC Efficiency Soft-Switching Photovoltaic Inverter

Design and Optimization of 99% CEC Efficiency Soft-Switching...

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Annual IEEE Applied Power Electronics Conference and Exposition

作者： Baifeng Chen Jih-Sheng Lai Chien-Liang Chen Wensong Yu Nathan Kees Cong Zheng Bin Gu Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA 24060 USA International Rectifier Irvine Design Center Sr. System Application Engineer Irvine CA 92614 USA

ISBN: (纸本)9781467343541

Driven by worldwide demands for renewable energy source, photovoltaic (PV) inverters, which are the most important part for energy conversion, have seen a considerable amount of innovations in recent years. The trends for PV inverters are toward high efficiency, high reliability, low ground leakage current, low-output ac-current distortion, and reactive power capability. This paper provides an efficiency optimized design of an Auxiliary Resonant Snubber with Coupled-Magnetic Reset Zero-voltage switching (ZVS) inverter for PV application. The main device is Power MOSFETs, which have low conduction loss and could achieve ZVS in all load condition. The auxiliary devices are low current, low cost IGBTs and Diodes, which could achieve zero-current switching (ZCS). To achieve high efficiency, resonant circuit is analyzed to optimally design the resonant components, which is based on the guarantee of full range ZVS, gating delay-time design, and lower power loss in auxiliary circuit. The power loss model is also analyzed to select suitable power device and further improve the efficiency. At last, experiment results of a 5kW single phase inverter in PV system was presented, which has more than 99% CEC efficiency and work in full load condition without cooling fan. Besides, reactive power capability is also demonstrated.

关键词： PV ZVS CEC

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A coevolutionary memetic particle swarm optimizer

A coevolutionary memetic particle swarm optimizer

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3rd International Conference on Swarm Intelligence, ICSI 2012

作者： Zhou, Jiarui Ji, Zhen Zhu, Zexuan Chen, Siping College of Biomedical Engineering and Instrument Science Zhejiang University Hangzhou 310027 China Shenzhen City Key Laboratory of Embedded System Design College of Computer Science and Software Engineering Shenzhen University Shenzhen 518060 China

ISBN: (纸本)9783642309755

This paper presents a coevolutionary memetic particle swarm optimizer (CMPSO) for the global optimization of numerical functions. CMPSO simplifies the update rules of the global evolution and utilizes five different effective local search strategies for individual improvement. The combination of the local search strategy and its corresponding computational budget is defined as coevolutionary meme (CM). CMPSO co-evolves both CMs and a single particle position recording the historical best solution that is optimized by the CMs in each generation. The experimental results on 7 unimodal and 22 multimodal benchmark functions demonstrate that CMPSO obtains better performance than other representative state-of-the-art PSO variances. Particularly, CMPSO is shown to have higher convergence speed. © 2012 Springer-Verlag.

关键词： Global optimization

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