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Edwardsiella tarda the etiological agent for edwardsiellosis, a devastating fish disease prevailing in worldwide aquaculture industries was subjected to a molecular genetic study. To research into the influence when RpoN (σ(54) ) and RpoS (σ(38) ) were deleted simultaneously, the double deletion mutant of RpoN (σ(54) ) and RpoS (σ(38) ), namely rnrs, was(More)
Map retrieval, the problem of similarity search among a large collection of 2D pointset maps previously built by mobile robots, is crucial for autonomous navigation in both indoor and outdoor environments. Unlike previous Bag-of-words scene model which lacks spatial layout information, we exploit a holistic local map descriptor which is view-independent and(More)
Polychromatic sets theory is used for box parts CAPP expert system so as to store knowledge rules of selecting machining method in the form of contour matrix. The rules can be adopted to provide a new way to build process knowledge base. Through the logic operation of coloring in the knowledge base, the machining schemes relating to their features can be(More)
The application of CAD and artificial intelligence technology, which adopts reasonable CBR realization mode, meets industry practice and design habit of designer, and can support product design process effectively, and is a very practical realization way of automotive and rapid design of series product. It is a very important research of CAD and artificial(More)
Active knowledge aided system is described in the paper according to the Characteristics of previous knowledge aided system. The construction mechanism of active knowledge aided system is proposed by giving the example of typical automobile parts. Based on the knowledge base and the principles of human's rapid utilization of knowledge, the knowledge(More)
Sigma factors are important regulators that bacteria employ to cope with environmental changes. Studies on the functions of sigma factors have uncovered their roles in many important cellular activities, such as growth, stress tolerance, motility, biofilm formation, and virulence. However, comparative analyses of sigma factors that examine their common and(More)
A novel visual image retrieval technique for fast cross-view UAV localization is presented in this paper. Our first contribution is to address the computational complexity of raw image matching, which can be time/space intractable due to the high dimensionality of raw image data. We propose to exploit raw image matching, not for the direct matching between(More)
Mechanical product design is one of typical fields which strongly depend on past experience, and its domain knowledge constitution is complex. Oriented to industrial application and product design process, driving serial design of mechanical product by domain knowledge can make the designers release from the onerous repeated work. According to(More)
An approach to the solution of sequencing machining step on a machining center is proposed. Constraints model is established based on polychromatic sets theory and it is combined with a Genetic Algorithm to a sequence machining step on a machining center. In the model part contour matrix is used to formalize the conditioned restrictions visually and(More)