Morning stars

Unweighted p-center problem on extended stars

An extended star is a tree which has only one vertex with degree larger than two. The -center problem in a graph  asks to find a subset  of the vertices of  of cardinality  such that the maximum weighted distances from  to all vertices is minimized. In this paper we consider the -center problem on the unweighted extended stars, and present some properties to find solution.

Morning Briefing

Morning Briefing

Reuters/Ipsos opinion poll: Two-thirds of Americans say fix Obamacare, don't repeal it. [1] More than half say, get on to other priorities. Has Congress ever changed the Affordable Care Act? Yes, it has and with bipartisan support. A short history. [2] President Trump ratcheted up his pressure on lawmakers to pass a healthcare plan with a threat to end key Obamacare payments and cancel some of ...

Morning Sounds

Morning Report.

Y pull into the hospital parking lot just before dawn — one of the first cars in, one of the last out. As a first-year resident, you make up in hours what you lack in experience. You speedwalk to the hospital’s back entrance through the January fog. You wonder if you left the iron on in your apartment. No matter how often you iron and bleach your white coat, it never looks or feels clean. You n...