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2012 International Conference on Systems and Informatics, ICSAI 2012

作者： Chen, Haixia Du, Yuping Jiang, Kai Science and Technology on Electro-optical Information Security Control Laboratory Beijing China 45th Research Institute CETC Beijing China

ISBN: (纸本)9781467301992

This paper proposes a method for classification of incomplete data using neural network ensembles. In the method, the incomplete data set is analyzed and projected into a group of complete data subsets that give a full description of the known values in the data set by joining together. Those complete data subsets are then used as the training sets for the neural networks. Base classifiers are selected and integrated according to their classification accuracies and the support degrees of their training data sets to give the final predication. Compared with other methods dealing with missing data in classification, the proposed method can utilize all the information provided by the incomplete data, maintain maximum consistency of the incomplete data set and avoid the dependency on distribution or model assumptions. Experiments on two UCI datasets showed the superiority of the algorithm to other two typical treatments of missing data in ensemble learning. © 2012 IEEE.

关键词： Classification (of information)

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From titanates to TiO_2 nanostructures: controllable synthesis, growth mechanism, and applications

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Science China Chemistry 2012年第11期55卷 2334-2345页

作者： XU DongSheng LI JianMing YU YuXiang LI JingJian Beijing National Laboratory for Molecular Sciences State Key Laboratory for Structural Chemistry of Unstable and Stable SpeciesCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Science and Technology on Electro-Optical ln/brmation Security Control Laboratory Sanhe 065201China School of Chemistry and Chemical Engineering South China Univerxity of TechnologyGuangzhou 510640China

The design and fabrication of nanostmctures based on titanium dioxide （TiO2） have attracted much attention because of their low cost, non-toxicity, stability, and potential applications in industry and technology. Recently, one-dimensional （1 D） struc- tured titanates have been used as titanium source to prepare TiO2 nanostructures with various crystalline phases, shapes, sizes, exposed facets, and hierarchical structures. Among the synthetic strategies, hydrothermal method is a facile route to controlla- ble preparation of well-crystalline TiO2 in one step. Herein, we review our recent progress in transferring 1D titanates into TiO2 nanostructures through hydrothermal method, including the transformation mechanism and applications.

关键词： TiO2 titanate hydrothermal nanostructure quasi-one-dimensional

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Design of weak optical signal detection circuit

Design of weak optical signal detection circuit

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第四届国际自动化测试与仪器仪表学术会议

作者： Wang Hao Lv Yong Liu Lishuang Lang Xiaoping Beijing Information Science & Technology University Science and Technology on Electro-Optical Information Security Control Laboratory

The design based on avalanche photo diode(APD)is described in this paper to provide a extract the weak signal from the *** amplifying circuit based on negative feedback current input can realize high sensitivity,low noise amplifying,and the OPA657 chip is selected as the ***280 active low-pass filter is used to suppress high frequency noise effectively and the output signal to noise ratio(SNR) is improved by 5 *** theory analysis and the experiment results show that the minimum detection power of the circuit is about 1.9nW to the light of980nm.

关键词： weak optical detection pre-amplifier filter avalanche photo diode(APD)

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Design of temperature control system for blackbody radiation source based on TEC

Design of temperature control system for blackbody radiation...

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第四届国际自动化测试与仪器仪表学术会议

作者： Li Fei Lv Yong Liu Lishuang Lang Xiaoping Beijing Information Science and Technology University Science and Technology on Electro-Optical Information Security Control Laboratory

In order to ensure the stability of temperature of the blackbody radiation source,a high-performance,high-precision temperature control system is *** system is based on the thermo-electric cooler(TEC) which is controlled by ADN8830 *** temperature of the blackbody radiation source is sensed by the Pt100 thermistor,and then the temperature signal is converted into the voltage signal by the temperature transmitter to *** PID closed feedback loop is adopted for the temperature *** the test of the designed temperature control system,the result shows that the set-up time of this system is about 340 s and the temperature control accuracy is ±0.02 ℃.

关键词： PID ADN8830 thermo-electric cooler(TEC)

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Non-negative matrix factorization based on double sparsity K-SVD

Non-negative matrix factorization based on double sparsity K...

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第三届数字制造与自动化国际会议

作者： Zheng Hong Li Zhen Li Zhao School of Automation Science and Electrical Engineering Beihang University Science and Technology on Electro-Optical Information Security Control Laboratory

This paper presents a novel non-negative matrix factorization algorithm based on double sparsity K-SVD. It keeps the good parts-based representation. And meanwhile it has a well sparsity as sparse coding. The influences given by different initialization condition have been successfully overcome. Compared with other algorithms, the algorithm proposed is much faster. This dissertation demonstrates the advantages of the proposed algorithm by simulator experimentation.

关键词： double sparisity K-SVD non-negative matrix factorization

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Classification of incomplete data using classifier ensembles

Classification of incomplete data using classifier ensembles

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International Conference on Systems and Informatics (ICSAI)

作者： Haixia Chen Yuping Du Kai Jiang Science and Technology on Electro-optical Information Security Control Laboratory Beijing China The 45th Research Institute of CETC Beijing China

关键词： Neural networks Classification algorithms Accuracy Data models Training data Machine learning Bagging

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Detecting and adapting to drifting concepts

Detecting and adapting to drifting concepts

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International Conference on Fuzzy Systems and Knowledge Discovery (FSKD)

作者： Haixia Chen Shengxian Ma Kai Jiang Science and Technology on Electro-optical Information Security Control Laboratory Beijing China The 45th Research Institute of CETC Beijing China

The importance of incremental learning in changing environments has been acknowledged in recent years. In this paper we present an ensemble learning method for supervised learning with drifting concepts. The method employs hypothesis test as mechanism for detecting concept drift and learns a base classifier for each new training data chunk. Former classifiers deemed as usable by the hypothesis test mechanism and the new classifiers are integrated to form the final classifiers ensemble for prediction. The main focus of the work is to identify the usability of base classifiers that representing the same or similar concept with the current one, make full use of the older valid information together with the newer examples to improve classification accuracy, and avoid the interference of classifiers representing conflictive concepts with the current one. Experiments with simulated concept drift scenarios compared the proposed method with other approaches. The results showed that the method could consistently recognize different types of drift, adapt quickly to these changes to maintain its performance level, and utilize the former knowledge to improve its performance for recurring context.

关键词： Classification algorithms Accuracy Training Learning systems Error analysis Machine learning Data mining

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Temperature control system of air-conditioning based on the fuzzy theory

Temperature control system of air-conditioning based on the ...

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2011 IEEE International Conference on Mechatronics and Automation, ICMA 2011

作者： Jing, Jiang Xuesong, Zhang Science and Technology on Electro-optical Information Security Control Laboratory Beijing China Science and Technology on Electro-optical Information Security Control Laboratory Northeast Institute of Electronics Technology Hebei China

ISBN: (纸本)9781424481149

Two-dimensional fuzzy temperature controller was used in the system of inverter air-conditioner to control the room temperature. Self-adjustment PID fuzzy controller was proposed to realize real-time control function. V/F control mode was used to compensate with low voltage, the average sampling algorithm was proposed to implement SPWM waveform modulation. Finally, the feasibility of self-adjustment PID fuzzy controller was verified by simulation, the actual operation results had proved that self-adjustment PID fuzzy controller had reliable, good output waveform and small harmonic wave, which could meet operational requirements of inverter air-conditioner. © 2011 IEEE.

关键词： Air conditioning

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From titanates to TiO2 nanostructures:controllable synthesis,growth mechanism,and applications

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中国科学:化学 2012年第11期42卷 1649页

作者： XU DongSheng 1,2,LI JianMing 1,YU YuXiang 1,3 & LI JingJian 1 1 Beijing National laboratory for Molecular Sciences,State key laboratory for Structural Chemistry of Unstable and Stable Species College of Chemistry and Molecular Engineering,Peking University,Beijing 100871,China 2 Science and technology on electro-optical information security control laboratory,Sanhe 065201,China 3 School of Chemistry and Chemical Engineering,South China University of technology,Guangzhou 510640,China Beijing National Laboratory for Molecular Sciences State Key Laboratory for Structural Chemistry of Unstable and Stable Species College of Chemistry and Molecular Engineering Peking University Beijing 100871 China Science and Technology on Electro-Optical Information Security Control Laboratory Sanhe 065201 China School of Chemistry and Chemical Engineering South China University of Technology Guangzhou 510640 China

The design and fabrication of nanostructures based on titanium dioxide (TiO 2) have attracted much attention because of their low cost,non-toxicity,stability,and potential applications in industry and ***,one-dimensional (1D) structured titanates have been used as titanium source to prepare TiO 2 nanostructures with various crystalline phases,shapes,sizes,exposed facets,and hierarchical *** the synthetic strategies,hydrothermal method is a facile route to controllable preparation of well-crystalline TiO 2 in one ***,we review our recent progress in transferring 1D titanates into TiO 2 nanostructures through hydrothermal method,including the transformation mechanism and applications.

关键词： TiO2 titanate hydrothermal nanostructure quasi-one-dimensional

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All solid state Mid-IR laser

All solid state Mid-IR laser

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2011 Academic International Symposium on Optoelectronics and Microelectronics technology, AISOMT 2011

作者： Xiao-Juan, Zhang Hai-Bo, Yang Hong, Xu Jun, Cai Science and Technology on Electro-Optical Information Security Control Laboratory Hebei China

ISBN: (纸本)9781457707964

A Tm laser pumped Mid-IR all solid-state laser is reported. A thulium laser is used to directly drive a ZnGeP2 optical parametric oscillator (OPO) with 1.99μm output to generate the 3∼5μm wavelength. Diode pumped Tm:YAP laser operates on 1.99μm, repetition frequency of 10KHz, the optical to optical conversion efficiency is 28%. The all solid-state Mid-IR laser runs at room temperature and achieves over 1W at 3∼5μm with an optical to optical conversion efficiency of 5.4% starting from the pump diode. © 2011 IEEE.

关键词： optical parametric oscillators

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