The present invention is directed to a single hand, paper towel sheet dispenser comprising a base and a core holder operable to hold a roll of paper towel segments. The base has an upper end, a lower end, and an outer peripheral surface having accordion pleating formed in at least a portion thereof. In one embodiment, an even-odd link activation framework is defined for a given multihop wireless backhaul network, and an associated scheduling policy based on an arbitrary existing scheduling policy for wireline networks is derived and adopted. The QCL image head is provided with Pulse Width Modulation for compensating for imaging speed. The projective transformation matrix is computed by fitting a polygon to a contour of each graphical object in the frame of image data and determining whether the polygon for each graphical object satisfies a set of predefined parameters to find a candidate polygon that corresponds to an outline of the projected computer screen image in the frame of image data. The service group comprises a first plurality of network elements.