How to greet the audience at the beginning of a PhD defense talk/presentation? I'll be giving a 30-min public talk as a part of my PhD defense next month. It would be attended by the examination committee (consisting of my advisor and two examiners). I reckon that some professors/lecturers from the university might also join it apart from my colleagues and friends. 

What would be a suitable - neither too short or seemingly-snappy nor too long and boring - way to address the audience at the very beginning of my talk? For instance, starting with 


  Hello everyone 


sounds a bit too informal to me. Personally, I am inclined to starting with 


  Respected members of the examination committee...


but I am not sure if that, because of the "Respected ", may be considered too traditional (unfortunately, I don't recall how my colleagues who graduated in the last years did it - you never focus on such aspects until it is your turn :-$). 

Should I refer to the examination committee using names, as in:


  Respected members of the examination committee, Prof. X, Prof. Y, and Prof. Z


or better not?

For peers and friends, addressing could simply continue as 


  ... and dear colleagues and friends. 


Should I also try to sandwich another category specifically for the other professors and lecturers? If so, what could be a suitable way to address them?
I would like to second both xLeitix and Koldito's comments and convert them into an answer:


In most cases, there is no requirement, and you can just say, "Good [morning/afternoon], my name is [name], and welcome to my thesis defense."
A very few institutions have a much more formal set of requirements.  For example, when I was an examiner for a defense at TU Delft, I had to learn a few words of Dutch in order to ask my questions with the required formality.  Also, I had to come a day early to get fitted for a special archaic form of suit. Don't worry about this, though: if this is the case for your institution, then somebody will make sure that you are instructed in what to do.