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International Journal of Control and Automation 2014年第1期7卷 171-180页

作者： Ma, Li Li, Bo Yang, Zhen Bin Du, Jie Wang, Jin Jiangsu Engineering Center of Network Monitoring Nanjing University of Information Science and Technology Nanjing 210044 China School of Computer and Software Nanjing University of Information Science and Technology Nanjing 210044 China Key Laboratory of Meteorological Disaster of Ministry of Education Nanjing University of Information Science and Technology Nanjing 210044 China CMA Public Meteorological Service Centre Beijing 100081 China

The prediction of wind farm output power is considered as an effective way to increase the wind power capacity and improve the safety and economy of power system. It is one of the hot research topics on wind power. The wind farm output power is related to many factors such as wind speed, temperature, etc., which is difficult to be described by some mathematical expression. In this paper, Back Propagation (BP) neural network algorithm is respectively combined with genetic algorithm (GA) and particle swarm optimization (PSO) to establish the combination prediction model of the short-term wind farm output power based on meteorological data collected by Wireless sensor network (WSN). The meteorological data is used to determine the input variables of the BP neural network. Meanwhile, the GA and the PSO is respectively used to adjust the value of BP's connection weight and threshold dynamically. Then the trained GA-BP and PSO-BP neural network are used to predict the wind power by combination method. The experiment results show that our method has better prediction capability compared with that using BP neural network, GA-BP neural network and PSO-BP neural network alone. © 2014 SERSC.

关键词： Wireless sensor networks

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A 0.5 v divider-by-2 with forward-body bias technique for wireless sensor networks

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2012 International Conference on Electrical and Electronics engineering, ICEE 2012

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

ISBN: (纸本)9781461449805

As the CMOS technology scaling into nanometer and the power supply voltage decrease, low-voltage circuit design becomes a challenge. A divider-by-2 with 0.5 V power supply implemented in TSMC 0.13 μm 1P8M CMOS process is designed to produce 2.4 ~ 2.5 GHz quad-signals for Wireless sensor networks (WSN). To reduce the threshold voltage of transistors, low-threshold (LT) NMOS transistor in Deep-N-Well (DNW) with Forward-Body Bias technique is used in the circuits. The design of layout with DNW and isolation of the bulk of the LT NMOS with the substrate are explained in this chapter. The post-simulated operating frequency range is 2.5 ~ 7 GHz and the power consumption is 0.9 mW at 5 GHz. © 2014 Springer Science+Business Media New York.

关键词： Wireless sensor networks

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Compact and Tunable Mid-IR Light Source Based on a Dual-Wavelength Fiber Laser

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Chinese Physics Letters 2013年第11期30卷 106-108页

作者： CHANG Jian-Hua WANG Ting-Ting ZHANG Chuang GE Yi-Xian TAO Zai-Hong Jiangsu Key Laboratory of Meteorological Observation and Information Processing Nanjing University of Information Science&TechnologyNanjing 210044 Jiangsu Technology&Engineering Center of Meteorological Sensor Network Nanjing University of Information Science&TechnologyNanjing 210044

A compact,tunable mid-IR difference-frequency generation(DFG)light source based on a dual-wavelength fiber laser and a 5mol%MgO-doped periodically poled lithium niobate(MgO:PPLN)crystal is developed and *** output power of 233μW is achieved with a conversion efficiency of 0.1%/*** mid-IR wavelength can be tuned between 3308 nm and 3314 nm by changing the temperature of a pair of fiber Bragg grating(FBG)taking as cavity mirrors in the dual-wavelength fiber laser from 26.5°C to 106.5°C.

关键词： fiber tunable Dual

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Channel state division of land satellite mobile and its multi-states Markov model based on fuzzy clustering

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Journal of Computational Information Systems 2014年第4期10卷 1349-1356页

作者： Guo, Yecai Yuan, Tao Zhang, Xiuzai College of Electronic and Information Engineering Nanjing University of Information Science and Technology Nanjing 210044 China Jiangsu Key Laboratory of Meteorol Observa and Information Processing Nanjing 210044 China Jiangsu Technology and Engineering Center of Meteorology Sensor Network Nanjing 210044 China

Channel modeling of land mobile satellite (LMS) is the foundation of communication system design and its related circuit design. Furthermore, the research on the channel modeling is the key of satellite communications. Firstly, the propagation characteristics of the land mobile satellite channel (LMSC) are analyzed and their second-order statistical characteristics are derived in this paper. Secondly, the LMSC state division method based on fuzzy clustering analysis is proposed according to the real satellite communication environments. Finally, the multi-states Markov chain model with the real LMS propagation characteristics is established and simulated. Simulation results show that the proposed model can effectively reflect the real propagation characteristics of the LMSC. © 2014 Binary Information Press.

关键词： Fuzzy clustering

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A study of agricultural meteorological monitoring system based on wireless sensor networks

International Journal of Multimedia and Ubiquitous Engineeri...

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International Journal of Multimedia and Ubiquitous engineering 2014年第7期9卷 15-26页

作者： Ma, Li Yan, Jingzhou Yan, Shuangshuang Wang, Baowei Liao, Kuo Wang, Jin Jiangsu Engineering Center of Network Monitoring Nanjing University of Information Science and Technology Nanjing 210044 China School of Computer and Software Nanjing University of Information Science and Technology Nanjing 210044 China Key Laboratory of Meteorological Disaster of Ministry of Education Nanjing University of Information Science and Technology Nanjing 210044 China Ningde Meteorological Bureau Ningde 352100 China

In order to keep the sustainable development of agricultural industry, monitoring the four basic essential elements' changes, which are temperature, humidity, light intensity, carbon dioxide, and applying the corresponding solution is really necessary. An agriculture meteorological monitoring system with ZigBee wireless sensor networks (WSNs)and wireless communication technology is designed in this paper. sensor nodes are distributed in the measurement area and form a self-organizing network. The sink collects information which transmitted from sensor nodes and then, sends the information to the server. Server will summarize the information, then taking analysis and processing. At the end, the server will give some corresponding warningand forecast. The cost of this system is low and could improve the accuracy and timeliness in agricultural meteorological monitoring. © 2014 SERSC.

关键词： Zigbee

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Research and development of mobile application for android platform

International Journal of Multimedia and Ubiquitous Engineeri...

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International Journal of Multimedia and Ubiquitous engineering 2014年第4期9卷 187-198页

作者： Ma, Li Gu, Lei Wang, Jin Jiangsu Engineering Center of Network Monitoring Nanjing University of Information Science and Technology Nanjing 210044 China School of Computer and Software Nanjing University of Information Science and Technology Nanjing 210044 China Key Laboratory of Meteorological Disaster Ministry of Education Nanjing University of Information Science and Technology Nanjing 210044 China

Today, as the developing of hardware of mobile is getting better, the performance index is much higher than the actual requirements of the software configuration. Phone's features more depend on software. As the Android operating system is getting more popular, the application based on Android SDK attracts much more attention. But now, some of the Android application interface is too cumbersome, pop-up ads is overmuch and the function is too single, these cause some inconvenience to the users. This article presents the application by eliminating the redundancy. Three kinds of applications are developed base on Java and Android SDK --- Weibo client, video player and audio player. The audio player uses the ContentResolver and Curor to obtain music files and plays the music by using the Service Components to call the Media Player class in the background. The video player uses the Media Player class provided by Android SDK. This class loads the file through URL, realize the multimedia file parsing by calling the Open Core Library, which is at the bottom of Android, through JNI and by calling the Surface Flinger interface to realize the video files' playback. The users' data is collected through the Sina open platform called by Sina client and the data will be returned under the format of JSON by the Sina server. The system uses the OAuth authentication method for user authorization to complete the login process. The specific functions of this system are developed based on Android Weibo SDK. The interfaces of these Android apps are pretty and the operation is smooth. What's more, the cumbersome interface and excessive advertising are eliminated, so that users are able to manipulate these apps more conveniently and smoothly. © 2014 SERSC.

关键词： Android (operating system)

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Satellite channel markov model of ka-band based on principal component

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Journal of networks 2014年第7期9卷 1701-1706页

作者： Guo, Yecai Yuan, Tao Xiuzai, Zhang College of Electronic and Information Engineering Nanjing University of Information Science and Technology Nanjing China Nanjing Uni of Info Sci and Tech Jiangsu Key Laboratory of Meteorol Observation and Info Processing Nanjing China Nanjing Uni of Info Sci and Tech Jiangsu Tec and Eng Center of Meteorology Sensor Network Nanjing China

With the consideration of the existing Ka-band satellite channel model in data processing method deficiency, the Ka-band satellite channel propagation characteristic is analyzed and the influence of meteorological factors on the satellite channel is discussed. The channel of meteorological factor principal component is obtained by using the principal component analysis and fuzzy clustering analysis method is introduced into channel classification. The Ka-band satellite channel multi-sates Markov model is established and simulated finally. By comparing the level crossing rate and average fade duration with the former. The results shown that this proposed channel model is more accurate and effective and it is significant to the Ka-band satellite communication research. © 2014 ACADEMY PUBLISHER.

关键词： Principal component analysis

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A 0.5 V divider-by-2 design with optimization methods for wireless sensor networks

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Journal of Semiconductors 2013年第5期34卷 115-120页

作者：王利丹李智群 Institute of RF- & OE-ICs Southeast University Engineering Research Center of RF-ICs & RF-Systems Ministry of EducationSoutheast University Jiangsu Provincial Key Laboratory of Sensor Network Technology

A 0.5 V static master-slave D flip-flop （DFF） divider-by-2 is implemented with a 0.13 μm 1P8M RF- mixed signal CMOS process. Low-threshold transistors in a deep-N well with forward-body bias technology are used in the circuit. Each of the D-latch with source coupled logic consists of sensing and latching circuits. To increase the maximum operating frequency and decrease power consumption, the latching current is one half of the sensing current. The circuit optimization methods are described in this paper. The measured maximum operating frequency is 6.5 GHz and the minimum input singled-signal amplitude is 0.15 V.

关键词： low-threshold transistors deep-N well forward-body bias low voltage

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Backstepping based adaptive control of magnetic levitation system

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2013 International Conference on Energy Research and Power engineering, ERPE 2013

作者： Zhou, Wei Liu, Bao Bin Jiangsu Institute of Economic and Trade Technology China Zhejiang University China Jiangsu Engineering and Technology Center of Circulation Modernization and Sensor Network China

ISBN: (纸本)9783037857588

In view of parameter uncertainty in the magnetic levitation system, the adaptive controller design problem is investigated for the system. Nonlinear adaptive controller based on backstepping is proposed for the design of the actual system with parameter uncertainty. The controller can estimate the uncertainty parameter online so as to improve control accuracy. Theoretical analysis shows that the closed-loop system is stable regardless of parameter uncertainty. Simulation results demonstrate the effectiveness of the presented method. © (2013) Trans Tech Publications Switzerland.

关键词： Backstepping

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A low power quadrature up-conversion mixer for WSN application

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High technology Letters 2013年第3期19卷 228-232页

作者：吴晨健 Li Zhiqun Institute of RF-& OE-ICs Southeast University Engineering Research Center of RF-ICs & RF-Systems Ministry of EducationSoutheast University Jiangsu Provincial Key Laboratory of Sensor Network Technology

This paper presents an up-conversion mixer for 2.4GHz wireless sensor networks in 0. 181xm RF complementary metal-oxide semiconductor （CMOS） technology. It is based on a double-balanced Gilbert cell type. With two Gilbert cells it was applied quadrature modulation. Operational ampli- tiers are used in this design to improve the conversion gain under low power consumption. The mixer design is based on 0.18txm RF CMOS process. And the mixer test results indicate that under 1.8V power supply, with input frequency 2.4 - 2.4835GHz, the conversion voltage gain is 1.2 - 2dB. When the output frequency is 2.4GHz, its power gain is -4.46dB, and its input referred 1 dB com- pression point is -11.5dBm and it consumes 1.77mA current.

关键词： mixer low power Gilbert operational amplifier

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