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In order to improve the output-regulation accuracy of the switching converter with conventional constant off-time (CCFT) modulation, dual-edge constant off-time (DCFT) modulation for switching converter is proposed in this paper. The principle of switching converter with DCFT modulation, including leading-triangle constant off-time (LT-CFT) modulation and trailing-triangle constant off-time (TT-CFT)...
Aiming at the complex mechatronic design of ultra-precision grinding machine, especially its key component -- the ultra-precision hydrostatic guideways system, this paper proposed a design knowledge capture method based on ontology, which helps create a consensual knowledge model as well as the database of hydrostatic guideways. Based on the imaginal thinking theory, the search process and the results...
Aims at the nonlinearity such as friction and varieties of system parameters and unmodeled dynamics in azimuth gun control system of tank, in order to improve the low speed performance and anti-interference ability, the strategy of LADRC is proposed. Considering nonlinearity and non-model dynamics as a composite disturbance, the math model of azimuth gun control system is established firstly, then...
Since the block motion estimation in current video compressions standards has a very high computational complexity and is not suitable for real-time applications, a new fast block motion estimation algorithm with multidirectional adaptation is proposed in this paper. This algorithm first wisely judges the motion type of current encoding block. Then, according to the motion type, different search strategies...
There have been many researches on how to recommend tags for weblogs. In this paper, we propose a novel automatic tag recommendation algorithm, which can be used in the large-scale and real-time data process effectively and efficiently. Most existing researches on tag suggestion focus on firstly mining the relationship between testing and training data and then assigning the top ranked tags of the...
H.264 is most likely the future standard for the web-based applications of video streaming and browsing. The block motion estimation process is a very time consuming part in the H.264 video coding standard and thus hinders its real-time applications. Therefore, a new fast block motion estimation algorithm is proposed in this paper. In this algorithm, it first determines the current block as a quasi-stationary,...
The UMHexagonS algorithm has been accepted for the block motion estimation process in the H.264 video coding standard due to its high accuracy and low computational requirement. In this paper, a new algorithm is proposed, which improves on the UMHexagonS algorithm in three aspects. Firstly, a new prediction vector is added for avoiding being trapped in a local minimum. Secondly, the 5×5 full-search...
The block motion estimation process is a very time consuming part in the H.264 video coding standard and thus hinders its real-time applications. Therefore, a new fast block motion estimation algorithm is proposed in this paper. In this algorithm, it first determines the current block as a quasi-stationary, slow motion, or fast motion block. Then, according to the different motion types, different...
The UMHexagonS algorithm has been accepted for the possible implementation of the block motion estimation process in the H.264 video coding standard due to its high accuracy and low computational requirement. In this paper, a new algorithm is proposed, which improves on the UMHexagonS algorithm in three aspects. Firstly, a new prediction vector is added for avoiding being trapped in a local minimum...
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