What is pi? By TONG Woon Chi Pi is an interesting number. It is defined as the ratio of a circle’s circumference to its diameter, which ancient civilisations realized to be a constant. Given a circle with a diameter D or radius r and circumference C, mathematically, it …
Management System of Welding Process in Rolling Stock Factories By TONG Woon Chi Introduction A train set consists of car bodies connected together via couplers and linked with electrical cables. Each car body is made up of four major modules, namely, underframe, sideframe, roof and front/end frames. Both …