It's fairly standard to submit thesis chapters to journals. However, in my field (theoretical computer science) conference publication is much more important. Is there any problem with taking a section of my thesis and submitting it later to a conference? Would the conference object that this was dual submission?
In computer science in general, you can submit thesis extracts to conference just as freely as you would submit them to a journal. In both cases, the principle is the same: a thesis is not really a peer-reviewed publication, so your submission would still be the first peer-reviewed publication of the material. You must, however, cite your thesis and clearly acknowledge the source of the material as being adapted from your thesis.