in this paper, the main factors in the analysis of the railway concrete sleepers areinvestigated and new recommendations are made in order to improve the accuracy of the currentpractices in analysis of the railway track system. first, a comprehensive literature survey isconducted, then, fem models for a railway track system are developed and used to discuss andevaluate the assumptions commonly ...

We use the recently introduced concept of a Scaled Relative Graph (SRG) to develop graphical analysis input-output properties feedback systems. The SRG nonlinear operator generalizes Nyquist diagram an LTI system. In spirit classical control theory, important robustness indicators systems are measured as distances between SRGs.

Achieving the Millennium Development Goals has proven to be a real challenge. Providing evidence on cost-effective interventions did not prove to be sufficient to secure the trust of national authorities, health care providers and patients. Introducing change in a health system requires a good understanding of the relationships between the actors of the system. Social network analysis can provi...