In some surveys, the survey interview dates are scattered over many months. If a treatment unrelated to the survey purpose takes place during the survey period, then randomized data can obtain because individuals interviewed before and after the treatment timing are homogeneous. This happened in...

We develop a virtual tokamak platform choosing KSTAR tokamak as the target device. The Unity® game engine is employed to visualize the KSTAR main device. It is shown that with a proper reduction of the CAD data, a fast and interactive display of the device can be achieved in personal computer....