Saying in many cases its tuition is less than similar institutions, the University of Wisconsin-Madison is proposing a tuition increase for some of its students.  U-W Chancellor Rebecca Blank says at least 20 percent of the 16-million dollars generated would be funneled back into financial aid.  The Board of Regents is going to consider the request at a meeting this week in La Crosse.  Non-resident undergraduate and some professional school students would be affected.