Vhub: a knowledge management system to facilitate online collaborative volcano modeling and research

Table 1 Comparison of usage statistics for nanoHUB during 2005 and 2013, and Vhub for 2013

	nanoHUB 2005	nanoHUB 2013	Vhub 2013
Registered users ⁽¹⁾	2,179	27,726	1,157
Unregistered interactive users ⁽²⁾	5,380	34,088	1,632
Unregistered download users ⁽³⁾	11,309	243,425	12,368
Total users ⁽⁴⁾	18,868	304,639	15,157
Visitors ⁽⁵⁾	50,926	593,332	42,669
Simulation users ⁽⁶⁾	1,660	13,106	550
Simulation runs (jobs)	53,660	501,469	22,544

¹Number of Registered Users that logged in. User registration assigns a unique login to each individual user.
²Number of Unregistered Users, identified by unique hosts/IPs, that had an active session (active on the site for at least 15 minutes) without logging in. Does not include known web bots/crawlers.
³Number of Unregistered users, identified by unique hosts/IPs, that had an active session of less than 15 minutes without logging in and downloaded a non-interactive resource such as PDF or podcast. Does not include web bots/crawlers.
⁴Sum of Registered Users, Unregistered Interactive Users and Unregistered Download Users.
⁵Identified by a unique IP address / hostname.
⁶Number of Registered Users⁽¹⁾ that ran one or more simulation runs.