I do a lot of hiring (and firing
[You must be logged in to view images. Log in or Register.] ) and it really depends on the job you are looking at and what their needs are.
On the one hand, if I'm interviewing candidates for a position that I need to have someone stay in for an extended period of time, I would probably pass over your resume. Not that it's a general negative on your resume that you changed your positions that quickly, but I would assume you either get bored and move on or you are a motivated individual looking for rapid advancement. Now, if I was interviewing for a position that I knew would eventually open an opportunity to something your resume seems fit for (based usually on skill sets), I would look at it as a positive. Most of the time I'm looking for highly driven individuals that are self-motivated and have excellent organization and computer skills. Generally, when I start the process, I am looking for a specific set of criteria as a base starting point, and seeing position changes within an institution like that would not disqualify you if you met the base criteria.
I would definitely ask about the job changes during the interviewing process. I would ask something like 'what prompted or motivated the changes in position during your time at the University?'. Your answer there would be key.