Quota for CPU & MEM usage

["Reuben D. Budiardja" <reubendb innovativethought com>]

Hello,
Is there anyway I can assign quota to user for CPU and Memory usage? I am 
administrating a RH 7.3 machine, and sometimes I see (using top) user run a 
process that use > 90% of CPU, and this makes the machine very un-responsive 
to other users. So I am wondering if there's a way to limit that.

Thanknk in advance.
Reuben D. Budiardja