Korean in quartz() device.

Dear R users,

I run R-2.9.2 on the Snow Leopard 10.6.1 OS system. The default  
language of the OS is english.

I want to plot a very simple graph with Korean letters on a quartz()  
device, but it fails. Korean Letters appear as being squares.

The same command works fine in Windows systems.

My question is how can I draw or typeset Korean letters in quartz()  
device on SL OS?


Best regards,
Donghyun Oh