Guizhou Plateau is a region in China that typically shows the contradictory human-earth system. A vulnerability assessment indicator system was constructed to explore the coupled human-natural system characteristic of the karst landform based on the grey correlation analysis mathematic model. The quantitative assessment results show that Qiandongnan and Tongren Districts belong to the slight de...

Given a simple graph G = (V, E) and a fixed positive integer k. In a graph G, a vertex is said to dominate itself and all of its neighbors. A set D ⊆ V is called a k-tuple dominating set if every vertex in V is dominated by at least k vertices of D. The k-tuple domination problem is to find a minimum cardinality k-tuple dominating set. This problem is NP-complete for general graphs. In this pap...

Background: Diabetes mellitus and hearing loss are common public health problems. Sensorineural in Type 2 diabetes patients is an underestimated complication. The aim was to study the correlation between level of HbA1c degree sensorineural loss. Methods: It a cross sectional carried on 130 known cases T2DM, aged 25-50 years. Various confounding factors such as coexisting hypertension, ear disea...

Let d,m1, . . . ,mr be (r + 1) positive integers. Denote by V (d;m1, . . . ,mr) the variety of irreducible (complex) plane curves of degree d having exactly r ordinary singularities of multiplicities m1, . . . ,mr. In most cases, it is still an open problem to know whether this variety is empty or not. In this paper, we will concentrate on the case where the r singularities can be taken in a ge...

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Grey theory is an essential uncertain knowledge acquisition method for small sample, poor information. The classic grey theory does not adequately take into account the distribution of data set and lacks the effective methods to analyze and mine big sample in multigranularity. In view of the universality of the normal distribution, the normality grey number is proposed. Then, the corresponding ...

In order to maintain the sustainable development of resource-based industrial clusters, research on coupling relationship between clusters and regional innovation networks is proposed. Combined with historical data 11 typical cities from 2013 2021, grey relational model used measure correlation networks. And concept capacity coefficient in physics as a reference obtain degree The two, reasonabl...