The aim of the paper is twofold. First, we measure the degree of cultural diversity on the World Heritage list, considering both geographical and chronological unbalances. Second, we estimate the number of sites that would guarantee the highest level of cultural diversity and, then, we propose...

The immediate motivation of this paper is California Bill AB 394, legislation which mandates fixed nurse-to-patient staffing ratios as a means to address the current crisis in the quality of health care delivery. Modeling medical units as closed queueing systems, we seek to determine whether or...

The immediate motivation of this paper is California Bill AB 394, legislation which mandates fixed nurse-to-patient staffing ratios as a means to address the current crisis in the quality of health care delivery. Modeling medical units as closed queueing systems, we seek to determine whether or...