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During planetary imaging, the complicated imaging environment, atmospheric turbulence and the equatorial mount's inaccurate compensation for the Earth's rotation will cause image degradations including noise and deformation. A low-cost solution is image stacking which stacks low exposure frames to achieve long exposure result or averages long exposure frames to reduce noise level. The most critical...
In open and distance education field, making use of data mining technologies to understand students' practical needs and usage habits about professional courses, which will greatly enhance students learning. China Open University system is Chinese largest scale organization engaging in open and distance education, and it has taken Chinese education ministry's a rural education project, called "one...
As an effective dimensionality reduction method, feature selection can remove the irrelevant variables and increase the accuracy in machine learning. In this paper, a feature selection method based on grouped sorting is proposed to solve the problem of high-dimensional data processing. As in this work, feature grouping is firstly carried out with the redundancy between the features as the group criteria...
Construction engineering is considered as a complex network system project. By analyzing the relationship of construction costs and reliability in engineering project, a mathematical model is established to optimize the costs and genetic algorithm (GA) is used for this purpose. In the application of GA, penalty function is used to handle the constraint. Ranking based on the evaluation function and...
For the roller pass matching problem under a given hot rolling planning, two cases of the problem are considered in this paper: (1) static roller pass matching problem (SRPM) with non-recycled rollers, (2) dynamic roller pass matching problem (DRPM) with recycled rollers. To describe both of the two cases, a 0-1 integer programming formulation is established to minimize the total turning quantity...
Turnout systems are one of the most critical components of railway infrastructure, and they are also an extremely vulnerable part of railway signaling systems. Failure prediction of signaling systems is an attractive area of research in the field of railway operation maintenance. In this work, we focus on the prediction of weather-related failure of turnouts since weather has significant impacts on...
For heterogeneous wireless sensor networks energy costs, network data transmission, network life cycle and other issues, the introduction of basic research methods of complex network theory. In the modeling process, fully taking into account the degree and the current node wireless sensor network topology transformation and the residual energy of the nodes are closely related, the node with the node-link...
As semantic information is often missing in text representation, this paper proposes semantic graph structure to represent text and optimize graph structure by semantic similarity matrix. Then calculate the similarity of semantic graph structure by using the maximum common sub-graph of graph theory. Finally, K-means algorithm will be applied to expand Chinese text clustering to improve text clustering...
4-D Light field information, of which we can extract the target depth information, can be obtained with only one photo using light field camera. The existing target depth information acquisition methods based on light field mostly need huge amounts of photographs and complicated mathematical calculations. To solve these problems, this paper puts forward a light-field-based depth measurement method,...
Objective appraisal method, for instance, sum of absolute difference (SAD) or sum of the squared errors (SSE), is adopted by high efficiency video coding (HEVC), which inherits conventional objective rate distortion model. However, these methods fail to achieve high consistency with subjective visual perception. In order to improve computational efficiency of the video coding in HEVC, in this article,...
Multi-UAV cooperation could improve combat effectiveness and UAV's survivability. Cooperation method and system are the bases of cooperation. To overcome the faults of existing cooperation methods and systems, work flow is introduced, the workflow-based multi-UAV cooperation method and the corresponding airborne cooperation system architecture are proposed. With the workflow-based multi-UAV cooperation...
A digital third-order MASH 1-1-1 delta-sigma (ΔΣ) modulator (DSM) is designed and implemented on field programmable gate array (FPGA) customer board (Lyrtech) in fractional-N phase-locked loop (PLL). Fractional-N frequency synthesizers have many advantages over their conventional counterparts, integer-N synthesizers. The proposed paper combine with parallel forward-reverse Schottky-diode paths and...
The display mode of character scrolling has been widely applied in display design. This study mainly aims to examine the impact of different sizes of characters on visual search through the performance of visual search and ratings of subjective difficulties. A total of 12 college students participate in completing the visual search task of the target words in the rolling characters. The study aims...
Many association rule mining algorithms find associations and correlations from traditional transaction databases, in which the content of each transaction is definitely precise. However, due to instrument errors, imprecise of sensor monitoring systems, and so on, real-world data tend to be numerical data with inherent uncertainty. To deal with these situations, we propose a FP-growth-based mining...
Recommender systems are useful tools that help people to filter and explore massive information. While most recommender systems focus on providing recommendations for individuals, people's minds are easily altered and dominated by crowds, especially in a socialized environment. In addition to fulfill personalized intentions, more considerate recommendations, which maximize satisfactions of both individuals...
The elastic vibrations of two-link manipulators are decoupled from the flexible manipulator for vertical planar two-links flexible manipulators. And the system was decomposed into two subsystems, slow-changing subsystem and fast-changing subsystem. An adaptive inverse controller based on model-reference is established for slow-changing subsystem. The fast-changing subsystem was deal with as disturb...
Artificial fish swarm algorithm (AFSA) is a newly proposed swarm intelligent optimization algorithm. It is proved to be a promising approach to complex engineering problems, yet still there exist some defects of this algorithm. To solve the problem that AFSA has a low rate of convenience, low optimization precision, premature convergence and poor ability of balancing exploitation and exploration,...
With the improvement of people's living standard, people's demand for seamless sports underwear is not only limited to the sports function, but more attention to its thermal and moisture comfort. As a new type of raw materials, Pupa protein fiber has a good health performance, and favored by its excellent moisture permeability. If the pupa protein fiber could be applied to seamless sports underwear...
The optimization object is the super-heated steam temperature of 300MW CFB. DE (Differential Evolution) algorithm is used to optimize the parameters of a fuzzy controller which is the actuator of the super-heated steam temperature control system. The control result shows DE algorithm for optimization is more robust and faster compared with traditional controllers.
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