in recent years, various attempts have been made by media managers to achieve a framework to move from conventional newsrooms to convergent newsrooms.so it seems that the recognition of obstacles and barriers faced by newsrooms attaches of great importance. this research is a complete series of these challenges in four categories, including: technological, organizational, cultural and instituti...

The complete convergence for pairwise negative quadrant dependent PNQD random variables is studied. So far there has not been the generalmoment inequality for PNQD sequence, and therefore the study of the limit theory for PNQD sequence is very difficult and challenging. We establish a collection that contains relationship to overcome the difficulties that there is no general moment inequality. ...