The economics of the University of the Air of Japan revisited
In 1988 UAJ completed the first phase of its initial plan, thus enabling an assessment of the cost-effectiveness of UAJ and a forecast of its future based on available data. The cost per student at UAJ is 2/5, 1/2, and 3/4 of that at national, public, and day programs of private universities, and 1.1 times and 6.7 times of that at evening and correspondence programs of private universities repectively. The projected cost per graduate is slightly lower than that at national universities and 1.1, 1.9 and 2.3 times of that at public, correspondence and day, and evening programs of private universities respectively. The cost per credit is 1.3, 1.5, 2.2, 2.4 and 4.6 times of national and public universities, day, evening, and correspondence programs of private universities respectively.The simulations indicate that the cost per credit can be decreased by expanding the operation of UAJ to a nationwide scale, employing a surface circuit or satellite system; however, it is necessary that the number of students be doubled in order to make the cost per credit equivalent to that at public universities. However, even when the number of students is four times, the cost per credit is not equivalent to that at day programs of private universities regardless of what method is used. Although the current cost per credit is higher than that of conventional universities, changes in cummunication technology and student characteristics could alter the cost-effectiveness of UAJ.
The economics of the open university revisited
Revision of earlier cost calculations for the Open University and Conventional Universities in the U.K. for 1973 confirms the findings of a significant cost advantage to the Open University. An analysis of developments at the Open University since 1973 indicates, however, that there has been little reduction in average cost in real terms and no improvement is likely on known developments to 1979. This is surprising for it might be expected that as student numbers rise average costs would fall. A more detailed analysis of the structure of Open University costs indicates why this has not happened. A major determinant of costs is the number of courses and these have continued to grow rapidly since 1973. The rate of increase of new courses has been faster than the rate of increase of new students. In effect the University has been using the economies provided by increased student numbers to increase student choice through the provision of more courses rather than reduce average cost.Average cost could be reduced whilst keeping the same number of courses by changing the components of the teaching system such as broadcasting. If such fundamental changes were not acceptable then an alternative would be to change the mix of courses between the relatively expensive science and technology areas and the cheaper arts and social science areas. A further alternative is to keep the same mix but ensure a longer life for science and technology courses.
Measurement and Demonstration of Thermal Expansion Coefficient
There are many classroom demonstrations, such as the ball-and-ring experiment, for showing the existence of thermal expansion of solids. The coefficient of linear expansion α (= increase in length divided by the original length times the change in temperature) may be measured in high school laboratories using a number of methods.1–4 In this paper we describe an especially simple experiment for determining α for a metal rod. It is based on the well-known optical lever method and is suitable for either a laboratory experiment or a classroom exercise.