How can we generate realistic graphs? In addition, how can we do so with a mathematically tractable model that makes it feasible to analyze their properties rigorously? Real graphs obey a long list of surprising properties: Heavy tails for the inand out-degree distribution; heavy tails for the eigenvalues and eigenvectors; small diameters; and the recently discovered “Densification Power Law” (...

In this paper, an entropy-based method is proposed to forecast the demographical changes of countries. We formulate the estimation of future demographical profiles as a constrained optimization problem, anchored on the empirically validated assumption that the entropy of age distribution is increasing in time. The procedure of the proposed method involves three stages, namely: 1) Prediction of ...

The emergence of cooperation in social dilemmas has been addressed in a number of fields. In this paper, we illustrate how robust cooperation can emerge among a population of agents participating in a N-player dilemma when the agents are spatially arranged on a graph exhibiting small world properties. We present a graph structure with a high level of community structure, small diameter and a va...

This paper discusses learning contents design from the viewpoint of knowledge level and symbol level. The purpose of study is to develop a foundation for share and reuse of IESs on a global platform. SCORM2004 is becoming de facto standard so we choice it as the basis of the platform. On the platform we aim to build an environment for authors to clarify pedagogical meaning of learning contents ...

background: routine use of gloves, masks and spectacles are important in infection control. aim of this study was to assess the knowledge and attitudes of infection control measures among the patients attending clinics of riyadh colleges of dentistry and pharmacy (rcsdp) in saudi arabia. material and methods: it was a cross-sectional descriptive study of a convenient sample of dental patients a...

Purpose – This study intends to present some inluences developed during the economic crisis related to the education area in some European countries. The study wants to present a comparative analysis among these European countries. Design/Methodology/Approach – This study is based on the Eurostat data series and is designed due to the statistical data processing. Findings – The study revealed s...

Introduction: Three basic strategies against substance abuse are control of distribution, treatment of dependents and prevention. Recent years experiences have shown the significant importance of prevention. Considering the decrease in age of substance abuse onset, parents’ knowledge about this phenomenon and consequently its early prevention and control in the family is very important. Method:...

A sensor network key distribution scheme for hierarchical sensor networks was recently proposed by Cheng and Agrawal. A feature of their scheme is that pairwise keys exist between any pair of high-level nodes (which are called cluster heads) and between any (low-level) sensor node and the nearest cluster head. We present two attacks on their scheme. The first attack can be applied for certain p...