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International Conference on Computational Intelligence Theory, Systems and Applications (CCITSA)

作者： Jun Shen Sai Ji Jian Shen Zhangjie Fu Jin Wang School of Computer & Software Nanjing University of Information Science & Technology China Jiangsu Technology &Engineering Center of Meteorological Sensor Network Naniing University of Information Science & Technologgy China

So far, cloud storage has been accepted by an increasing number of people, which is not a fresh notion any more. It brings cloud users a lot of conveniences, such as the relief of local storage and location independent access. Nevertheless, the correctness and completeness as well as the privacy of outsourced data are what worry could users. As a result, most people are unwilling to store data in the cloud, in case that the sensitive information concerning something important is disclosed. Only when people feel worry-free, can they accept cloud storage more easily. Certainly, many experts have taken this problem into consideration, and tried to solve it. In this paper, we survey the solutions to the problems concerning auditing in cloud computing and give a comparison of them. The methods and performances as well as the pros and cons are discussed for the state-of-the-art auditing protocols.

关键词： Cloud computing Protocols Data models Computational modeling Security Information science Scalability

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A Video Streaming Application Layer Multicast Protocol for WLAN

A Video Streaming Application Layer Multicast Protocol for W...

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The 2011 International Conference on Materials engineering for Advanced Technologies(ICMEAT 2011)

作者： CHENG Yong WEN Lei YANG Ling WANG Wei ZHOU Yong WANG Feng Jiangsu Technology and Engineering Center for Meteorological Sensor Network Nanjing University of Information Science & Technology Computer School Wuhan University Bin Jiang College Nanjing University of Information Science & Technology

The problem solved in this paper is to design a video streaming protocol which is accomplished by the application layer multicast in the WLANThis protocol, WVALM, divides the whole video streaming into small blocks, and achieves the requirement of streaming multicast by multicasting those small blocksThe receiver and the sender use streaming window and retransmit window respectively to coordinate their relationshipThrough experiment test, WVALM achieves the original object and could work well in the wireless environment.

关键词： video streaming,application layer multicast,WLAN,p2p

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Bifurcation Analysis of the Colpitts Oscillator Driven by the Chaotic Pulse Signal

Bifurcation Analysis of the Colpitts Oscillator Driven by th...

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International Conference in Electrics, Communication and Automatic Control, ECAC 2011

作者： Li, Chunbiao Hu, Wen Ma, Wei Department of Mechanical and Electrical Engineering Jiangsu Institute of Economic and Trade Technology Nanjing210007 China State Key Laboratory of Millimeter Waves Southeast University Nanjing210096 China Engineering Technology Research and Development Center of Jiangsu Circulation Modernization Sensor Network Jiangsu Institute of Economic and Trade Technology Nanjing210007 China School of Electronic and Information Engineering Nanjing University of Aeronautics and Astronautics Nanjing210016 China

ISBN: (纸本)9781441988485

The dynamical behavior of Colpitts oscillator driven by chaotic pulse signal that is based on the bifurcation method is analyzed in this study. We present simulation results of bifurcation in the driven Colpitts system. Colpitts oscillator driven by sinusoidal signal and periodic pulse signal are taken as contrast to demonstrate the nonlinear approach for both the sinusoidal and the chaotic mode of operation. With the appropriate choice of driving signal, the Colpitts circuit can process a robust chaotic state. The bifurcation diagram shows a periodic or chaotic oscillation state determined by the factor of the driving signal. © Springer Science+Business Media, LLC 2012.

关键词： Bifurcation (mathematics)

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Design of a low power charge pump circuit for phase-locked loops

Design of a low power charge pump circuit for phase-locked l...

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2012 4th International High Speed Intelligent Communication Forum, HSIC 2012

作者： Xu, Huili Li, Zhiqun Institute of RF-and OE-ICs Southeast University China Engineering Research Center of RF-ICs and RF-Systems Ministry of Education Southeast University China Jiangsu Provincial Key Laboratory of Sensor Network Technology Wuxi 214135 China

ISBN: (纸本)9781467306751

In this paper, the design of a charge pump circuit suitable for lower power PLL-based frequency synthesizer is presented. The charge pump circuit was designed in 0.18m CMOS process. The proposed charge pump circuit improves current matching in a wide output voltage range by applying a wide input ranged operational amplifier. The percentage error of current mismatch for the output range from 0.3V to 1.7V is less than 0.005%. The power consumption of the proposed charge pump circuit is around 0.56mW at a supply voltage of 1.8V. © 2012 IEEE.

关键词： Charge pump circuits

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A 7-bit 26-MS/s SAR ADC in 0.18 m CMOS process for WSN application

A 7-bit 26-MS/s SAR ADC in 0.18 m CMOS process for WSN appli...

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2012 4th International High Speed Intelligent Communication Forum, HSIC 2012

作者： Yang, Ting Li, Zhiqun Institute of RF-and OE-ICs Southeast University China Engineering Research Center of RF-ICs and RF-Systems Ministry of Education Southeast University China Jiangsu Provincial Key Laboratory of Sensor Network Technology Wuxi 214135 China

ISBN: (纸本)9781467306751

A 7-bit 26MS/s SAR (successive approximation register) ADC is presented in this paper for the application of ZigBee receiver. Compared to the conventional method, the set-and-down method reduces the average switching energy by around 80%. Dynamic comparator is chosen to diminish the signal-dependent offset caused by the non-fixed input common-mode voltage. A prototype ADC was implemented in a CMOS 0.18-m technology. The ADC consumes 1.66 mW at 26MS/s under a 1.8-V supply. The post-simulation shows that SNDR and SFDR are 43.11dB and 57.49dB, when sampling 3.19921875 MHz sinusoid input signal at 26MHz sampling clock. © 2012 IEEE.

关键词： CMOS integrated circuits

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A 1.8-V 1.8 GHz LC VCO for WSN application

A 1.8-V 1.8 GHz LC VCO for WSN application

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2012 4th International High Speed Intelligent Communication Forum, HSIC 2012

作者： Zhao, Sheng Li, Zhiqun Institute of RF-and OE-ICs Southeast University China Engineering Research Center of RF-ICs and RF-Systems Ministry of Education Southeast University China Jiangsu Provincial Key Laboratory of Sensor Network Technology Wuxi 214135 China

ISBN: (纸本)9781467306751

A 1.8 GHz LC VCO in 1.8-V supply is presented. The VCO achieves low power consumption by optimum selection of inductance in the L-C tank. To increase the tuning range, a three-bit switching capacitor array is used for digital switched tuning. Designed in 0.18m RF CMOS technology, the proposed VCO achieves a phase noise of 126.2dBc/Hz at 1MHz offset and consumes 1.38mA core current at 1.8-V voltage supply. © 2012 IEEE.

关键词： Variable frequency oscillators

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A low power 0.3-3.8 GHz low-noise mixer with noise cancellation

A low power 0.3-3.8 GHz low-noise mixer with noise cancellat...

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2012 IEEE MTT-S International Microwave Workshop Series on Millimeter Wave Wireless technology and Applications, IMWS 2012

作者： Shen, Changguo Li, Zhiqun Institute of RF- and OE-ICs Southeast University China Engineering Research Center of RF-ICs and RF-Systems Ministry of Education Southeast University China Jiangsu Provincial Key Laboratory of Sensor Network Technology Wuxi 214135 China

ISBN: (纸本)9781467309028

This paper shows a low power low-noise mixer in RFCMOS 0.18μm technology that operates between 0.3-3.8GHz. The low power mixer has a Gilbert cell configuration which employs low-noise transconductors designed using the noise-cancelling technique. And the low-noise amplifier designs use the current-reused topology to reduce power consumption and employ a capacitive cross-coupled (CCC) gm-boosting to improve noise performance. This merged front-end achieves 11-17dB power conversion gain, a flat SSB noise figure of 7.3-11dB with IF 2MHz over the whole working range. It only consumes 1.69mA current from a 1.8V supply and its active area occupies only 0.04mm 2. © 2012 IEEE.

关键词： Noise figure

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A comparative study of quantum evolutionary algorithm and particle swarm optimization for numerical optimization problems

International Journal of Digital Content Technology and its ...

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International Journal of Digital Content technology and its Applications 2011年第7期5卷 182-190页

作者： Ma, Tinghuai Yan, Qiaoqiao Xuan, Wenxia Wang, Bin Jiangsu Engineering Center of Network Monitoring School of Computer and Software Nanjing University of Information Science and Technology China National Meteorological Information Centre Chinese Meteorological Administration China

Quantum evolutionary algorithm (QEA) and particle swarm optimization (PSO) are two different types of intelligent optimization algorithm. Many efforts on these two algorithms have progressed actively in recent years. In this paper, six typical and complex benchmark testing functions are applied to verify their abilities for dealing with numerical optimization problems. The results show that QEA has better global search capability, which is manifested very outstandingly for the multi peak function optimization, but its convergence speed is slower. Contrarily, PSO has faster convergence speed, and it can solve certain optimization problem rapidly, especially for single peak functions.

关键词： Particle swarm optimization (PSO)

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Sparsity-Based Direct Location Estimation Based on Two-step Dictionary Learning

Sparsity-Based Direct Location Estimation Based on Two-step ...

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The 9th International Conference on Wireless Communications,networking and Mobile Computing(WICOM 2013)

作者： Tingting Wang Wei Ke Gang Liu The Jiangsu Engineering Center of Meteorological Sensor Network Technology Nanjing University of Information Science and Technology The Jiangsu Key Laboratory on Optoelectronic Technology School of Physics and TechnologyNanjing Norm University Key Laboratory of Disaster Reduction and Emergency Response Engineering of the Ministry of Civil Affairs

This paper proposes an adaptive sparsity-based direct position determination (DPD) appoach to locate multiple targets in the case of time-varying channels. The novel feature of this method is to dynamically adjust both the overcomplete basis and the sparse solution based on a two-step dictionary learning (DL) framework. The method first performs supervised offline DL by using the quadratic programming approach, and then the dictionary is continuously updated in an incremental fashion to adapt to the time-varying channel during the online stage. Furthermore, the method does not need the number of emitters a prior. Simulation results demonstrate the performance of the proposed algorithm on the location estimation accuracy.

关键词： Dictionary Learning Compressive Sensing Direct Location Time-Varying Channel Quadratic Programming

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Design of a low power 2GHz CMOS frequency divider for WSN applications

Design of a low power 2GHz CMOS frequency divider for WSN ap...

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2012 International Conference on Microwave and Millimeter Wave technology, ICMMT 2012

作者： Cao, Qinqing Li, Zhiqun Institute of RF and OE ICs Southeast University Nanjing 210096 China Engineering Research Center of RF-ICs and RF-Systems Ministry of Education Nanjing 210096 China Jiangsu Provincial Key Laboratory of Sensor Network Technology Southeast University Wuxi 214135 China

ISBN: (纸本)9781467321839

A 2 GHz programmable frequency divider is presented in this paper for Chinese and American band WSN applications. The divide ratio can be programmed from 720 to 960. The divider basically consists of a 15/16 dual-modulus prescaler and a programmable pulse-swallow counter. Forward phase switching technique is used to reduce power consumption and avoid glitches. Designed in 0.18-μm CMOS process, the 15/16 prescaler and pulse-swallow occupies a chip area of approximately 60 μm * 90 μm and 85 μm * 85 μm. The post-layout simulation shows that the divider can operate under input frequency ranging from 1GHz to 3GHz and consume 3.24 mW from a single 1.8V supply. © 2012 IEEE.

关键词： Phase locked loops

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