Public Libraries and Labor Markets

Differences in labor compensation across 31 large public library systems are examined based on the author's interview survey. Salaries for recruit clerical workers, recruit librarians, and librarians with five years' experience are compared along with hours of work per week and fringe benefits. Cost of living differences in metropolitan areas and collective bargaining are found to be strongly associated with differences in labor compensation. The collective bargaining differential for experienced librarians seems to be about13.5 percent.

Comparing Public Library Systems

The operations of 31 large public library systems across the country are compared using information from the author' s interview survey. Operations are compared in physical terms: hours of service, materials, locations, and staffing. Differences in operations are found to be associated with differences in labor costs, local fiscal circumstances, and demographics. The libraries seem to reduce hours in the face of higher labor costs. Differences in the use of the libraries are found to be associated with differences in library services and demographics. The number of materials acquired per capita has a strong impact on library use.

Control for an Autonomous Bicycle

The control of nonholonomic and underactuated systems with symmetry is illustrated by the problem of controlling a bicycle. We derive a controller which, using steering and rear-wheel torque, causes a model of a riderless bicycle to recover its balance from a near fall as well as converge to a time parameterized path in the ground plane. Our construction utilizes new results for both the derivation of equations of motion for nonholonomic systems with symmetry, as well as the control of underactuated robotic systems