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Hyperspectral unmixing is an important technique for identifying the constituent spectra and estimating their corresponding fractions in an image. Nonnegative Matrix Factorization (NMF) has recently been widely used for hyperspectral unmixing. However, due to the complex distribution of hyperspectral data, most existing NMF algorithms cannot adequately reflect the intrinsic relationship of the data...
Teleoperation system is a way of spreading human's sensing and manipulation capability to remote environment by means of telecontrolled technologies. A novel bilateral teleportation controller is proposed to deal with the problem of delay-dependent robust stability for time-varying asymmetric delays. The stability and transparency performance is obtained by delay-scheduled Lyapunov-Krasovskii functionals...
Obstacle detection is an important task in the field of environmental perception for Intelligent Ground Robots. This paper presents a new obstacle detection method which uses visual saliency detection to detect multiple obstacles in the scene. By analyzing the saliency map and the marker-based watershed algorithm, we combine their characteristics creatively to obtain accurate contours of obstacles,...
Collaborative filtering is one of the most successful approaches to building recommendation system. However, it still has some known disadvantages. One of them is called cold start problem caused by lack of user's historical data. Another problem appeared because mobile technology develops in high speed. The phenomenon that users change their taste according to their position quickly in mobile environment...
The Mobile Classroom Project aims at building an interactive platform between students and teachers. The LBS(Location Based Services) Teaching Platform is an important part of it. With its help, teachers can send homework, in-class exercises or related learning materials to students, which take mobile teaching equipment in the classroom. Students can submit their homework and in-class test in specified...
Technology of direct hot melt, concentration and crystallization to manufacture hydrazine hydrate solid waste into Na2CO3·H2O and Na2CO3 was researched, and principle of process was discussed. Effects of available chlorine dosage, pH value on hydrazine removal rate and crystallization temperature, water evaporation, crystallization time on purity and yield of Na2CO3 were investigated, finding out...
This paper proposes a zero-voltage and zero-current-switching three-level (ZVZCS TL) DC-DC converter using passive clamping circuit to reduce switching loss, improve current trails of IGBT and improve the converter efficiency. The proposed TL converter can achieve effective zero-voltage switching (ZVS) for the TL leg and zero-current switching (ZCS) for the two-level leg. By using the passive clamping...
Based on the characteristics of conventional full-bridge phase-shift PWM ZVS (zero-voltage-switching) DC-DC converter, a novel full-bridge phase-shift PWM ZVS DC-DC converter using non-dissipative snubber circuit is proposed. The converter can achieve ZVS for all switches effectively. The principle and operation modes of the converter are analyzed in detail, and the necessary condition of soft switching...
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