LRDC: Learning Resource Diffusion Based on Credibility for Computer-Supported Collaborative Learning

Table 7

The effect of message lifetime on message delivery success rate.

Algorithm/ttl (min)	30	60	120	240	360	600	900	1200	RECMSR	The normalized RECMSR	Average success rate	Relative promotion ratio (%)
LRDC	0.33	0.34	0.49	0.67	0.78	0.86	0.90	0.94	0.000074	1	0.66	0
DirectDeliver	0.03	0.03	0.14	0.18	0.21	0.32	0.35	0.35	0.00004	0.33	0.20	228
Epidemic	0.35	0.38	0.53	0.71	0.82	0.88	0.94	0.94	0.000023	0	0.7	-5
FirstContact	0.12	0.21	0.27	0.32	0.32	0.47	0.5	0.65	0.000036	0.26	0.36	85
SprayAndWait	0.12	0.21	0.35	0.5	0.68	0.77	0.82	0.85	0.00007	0.92	0.54	23
Average relative promotion ratio (%)												82.75