A vertex subset D ⊆ V of a graph G = (V, E) is a dominating set of G if each vertex of G is a member of D or is adjacent to a member of D. The cardinality of a smallest dominating set of G is called the domination number of G and a nonempty graph G is q-critical if q is the smallest number of arbitrary edges of G whose removal fromG necessarily increases the domination number of the resulting g...

The competition inherent to globalisation has led enterprises to gather in nests of specialised business providers with the purpose of building better applications and provide more complete solutions. This, added to the improvements on the Information and Communications Technologies (ICT), led to a paradigm shift from product-centrism to service-centrism and to the need to communicate and inter...

The two-dimensional (2D) quasi-geostrophic (QG) equation is a 2D model of the 3D incompressible Euler equations, and its dissipative version includes an extra term bearing the operator (−∆)α with α ∈ [0, 1]. Existing research appears to indicate the criticality of α = 1 2 in the sense that the issue of global existence for the 2D dissipative QG equation becomes extremely difficult when α ≤ 1 2 ...

Recent advancements in the field of smart machineto-machine (M2M) communications impose the necessity to improve the service delivery by enforcing appropriate security rules. Due to the large number of the connected devices, the criticality of the M2M applications, and the network stability weaknesses, we need to consider and analyze the security aspects and establish a flexible policy-aware ar...

A physical distribution task has typical characteristics of dynamic mobility: dynamic locations, time criticality, and environmental complexity. Research has focused on creating an environmental and task adaptive knowledge service system to support collaborative management of the physical distribution tasks. In this paper, four task context functions are established on the basis of defining cus...

This paper illustrates how fluctuations in aggregate economic activity can result from many small, independent shocks to individual sectors. The effects of the small independent shocks fail to cancel in the aggregate due to the presence of two non standard assumptions: local interaction between productive units (linked by supply relationships), and non-convex technology. We also argue that neit...