How do you set/change kernel parameters?

[pclapham at windstream.net]

Hi, all --

I am trying to load Oracle on my ubuntu server, and I need to set or change a number of kernel parameters.  Can anybody tell me where these are to be found, and whether one edits a conf file or uses a system application to change them?  For example, one parameter that needs to be changed is "semopm", and I can't find a listing of it anywhere in the documentation.

Thanks.

cheers,
pete