Use of Similarity of Triangular Fuzzy Numbers and a Derivation Calculation Formula in Assessment of Mortise-Tenon Joints Applied in the Joinery Category of Regional Taiwan Skills Competitions

This study is intended to assess the types of joints applied in Joinery Category Regional Taiwan Skills Competitions (hereafter referred as Competitions, including Northern Taiwan, Central and Southern Taiwan). The authors use a self-developed derivation calculation formula (∑i=1nw×hi) examine differences applied. Then regression equation adopted estimate distribution weight values joint calculate assessed likely be used 51st Competition. Subsequently, similarity fuzzy number employed understand tendency development from 36th Competition 50th outcome shows that 19 were value 2.3 open bevel mortise-tenon was highest, followed by 2 inclined 0.73 sloped haunch joints. Meanwhile, application triangular numbers indicates area affiliation map largest. Compared other 18 joints, level lowest. In words, acquired using have same tendency. Hence, it suggested when trainers/instructors determine training strategies, they should adopt assessment standards. At time, can also evaluate between various type development. Thus, teaching quality learning results contestants both upgraded. Systematic approaches consolidated strengthen ability vocational education (VET) order improve effects technical capacity category contestants. It hoped regional competitions VET.