A portable computer having a computer main body, a display connected to the computer main body, a hooking part provided in one of the computer main body and the display, and a latch part provided in the other of the computer main body and the display. The gate insulting film has a first portion made of silicon oxide in contact with the sidewall of the recess and a second portion made of silicon oxynitride in contact with the bottom of the recess. A second temperature-responsive device is provided within the heater and adapted to monitor temperature of the cooking utensil through the cooking surface to provide an electrical output as a function of temperature of the cooking utensil. These traffic engineering capabilities will have to be combined with a set of complementary operation, administration and maintenance functions for effectively managing and operating MPLS-based networks. By the present invention, even in reducing the pattern size on a substrate having thereon patterns having different pitches, the heat shrinkage of the over-coating agent can be controlled, irrespective whether the pitch is dense or isolate, thus achieving the pattern size reduction.