Zhang Tong

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In order to get high efficiency of LED drive circuit, a novel dual mode dimming LED driver based on buck DC-DC converter is presented in this paper. The peak current control mode with a slope compensation circuit is used in the buck DC-DC converter, which can drive more than 10 350mA LEDs in series with input voltage from 5V to 40V. In the chip a variety(More)
In this paper,on the basis of combing the relationship between the small and medium-sized tech-based enterprise's innovation project technology source, learning mode and innovation performance, proposed theoretical framework and theoretical assumptions of the relation of triadic relation, has carried on the empirical research using the sample data of(More)
The traditional SSIM haven't considered the limitation of the Human Visual System, which different attention paid to different area in the same picture, and information of the picture itself, leading to the final results are inconsistent between objective and subjective evaluating effects. A new image weighted index, which is regional weighted information(More)
Spectral awareness is currently one of the most challenging problems in CR designer. Recent researches in this area have suggested that cyclostationary approach is proposed as an effective method to solve the detection and estimation in spectral awareness. The drawback of this theory is its complexity of digital implementation. This paper specializes four(More)
Based on illustrating the concept of project performance of rural land consolidation, This paper aims to construct the performance evaluation index system to evaluate rural land consolidation among the 31 provinces in China in 2003~2007 and analyzes the feature of regional variation and its impact mechanism by applying the “P-S-P” framework(More)
This paper proposes a design of symbol timing synchronization for MB-OFDM systems with low hardware consumption. Most of the existing algorithms for symbol timing synchronization cost a huge number of operations on cross-correlation or energy computing, so that, a great amount of multipliers and logic resources would be consumed if these algorithms are(More)
Concrete beams reinforced with carbon-fiber-reinforced polymers (CFRPs) are subjected to considerable thermal stress at low temperatures. To mitigate this problem, this study conducts a series of tests on three concrete specimens at various temperatures, analyzes the change rule of thermal stress in CFRP-reinforced concrete beams, and discusses the(More)
Combining the intelligent algorithm such as BP neural network and support vector maching (SVM) with traditional chemical method, this paper models the relationship between plant surface color and its pigment. Using the neural network model constructed above, people can figure out the content of plant pigments by getting the corresponding plant surface color(More)
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