Data stream mining is a new technology for dynamically extracting feature patterns from data streams. Its core technology is data stream mining algorithms. Data stream mining algorithms are divided into clustering and classification algorithms. In data stream classification algorithms, VFDT (The Concept-adapting Very Fast Decision Tree algorithm is an effective classification decision tree algorithm. The algorithm dynamically constructs a decision tree based on the improvement of the Hoefdding tree. With the inflow of data, new branches are continuously added and outdated Branch. However, the algorithm has the problem of concept drift, and some nodes may no longer meet the Hoefdding bound, which affects the classification mining effect. This paper proposes an optimization algorithm (VFDT), which reduces the impact of concept drift and network noise by adding sliding window technology and fuzzy technology to the VFDT classification mining algorithm. Experimental results show that the algorithm can effectively improve the accuracy of stream data classification mining. Reduce classification errors.

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Demodulation system for applied to seismic detection, erbium-doped fiber super fluorescent source combined with demodulation, the design of optical fiber Bragg seismic detection demodulation system based on ASE source, optical power output of 6.9 mW (8.43 dBm), spectral up along the width of 3 nm and down along the width of 2.5 nm range linear fitting are 0.9994 and 0.9995 respectively. The output spectrum of SFS has good linearity in the monotone interval, ensure the detection signal enough tuning range and good sensitivity , it was make the SFS can be reliably used for fiber Bragg grating seismic detector as edge filter demodulation method.

Abstract. Based on the characteristics and teaching problems of electronic technology courses, this paper proposed to use the multisim simulation software in the whole process of analog electronic technology teaching, integrating theory and practice of teaching, which strengthen the theory teaching and make up for the lack of hardware in experimental teaching. The teaching practice of basic amplifier and integrated operational amplifier that are core components in analog electronics, for example, the analysis based on the integration of theory and practice in teaching methods of multisim stimulate students' interest in learning, improve learning initiative, and enhance understanding of the content students learned as well as their practical abilities, developing sense of innovation and achieving ideal teaching effect.

Abstract. Study and application of information technology in land field continues to deepen and cover wider range. After concluding the application of space information technology, including RS, GIS and GPS, in land field, this paper predicts the future direction of application of space technology in land field.