Relative centricity RC values of vertices/atoms are calculated within the Distance Detour and Cluj-Distance criteria on their corresponding Shell transforms. The vertex RC distribution in a molecular graph gives atom equivalence classes, useful in interpretation of NMR spectra. Timed by vertex valences, RC provides a new index, called Centric Connectivity CC, which can be useful in the topologi...

the future economy would be a network-centric economy. networks yield more meaning to the concept of perfect competition market. the successful presence in the network-centric economy requires identification and application of new technologies. in today’s competitive business environment, everything is continuously changing and the only thing remains intact is change. environment pressures forc...

background: this study aims to assess the pattern of meal frequency consumption of iranian children and adolescents at national and subnational levels according to the socioeconomic status (ses) of the living region. methods:  this multi-centric study was conducted in 2011-2012 among 14,880 students, aged 6-18 years, who were selected by multistage random cluster sampling from 30 provinces. mea...

It is well known that applying dynamic resource allocation to down-link transmissions of OFDMA systems provides a significant performance increase, by taking advantage of diversity effects. In order to quantify the maximum possible gain achievable by applying dynamic mechanisms, several optimization problems have been suggested for studying a dynamic system’s optimal behavior. However, so far t...

  The primary characteristic of an Ultra-Large-Scale (ULS) system is ultra-large size on any related dimension. A ULS system is generally considered as a system-of-systems with heterogeneous nodes and autonomous domains. As the size of a system-of-systems grows, and interoperability demand between sub-systems is increased, achieving more scalable and dynamic access control system becomes an im...

Despite its success, the Internet is suffering from several key design limitations, most notably the unification of endpoint locators and identifiers, and an imbalance of power in favor of the sender of information. The unfavourable consequences are that the full range of possibilities offered by the Internet may not be fully realized and trust in its proper operation has been significantly wea...

We present a metamodel which forms the basis for the design and implementation of modular information systems supporting a cooperative working environment. The model consists of four separate, but interconnected, sub-models dealing with all aspects of modular systems from the database meta and object model down to a possible storage model. The database connectivity metamodel is crucial in suppo...