Abstract: The purpose of the present invention is to provide a dryer using a heat exchanger, the dryer comprising: a dryer body (10) having a drying chamber (12) for receiving a material to be dried therein and an air flow chamber (14) positioned near the peripheral portion of the drying chamber (12); a sensible heat exchanger (20) contained in the air flow chamber (14) of the dryer body (10); a blowing fan (30) contained in the air flow chamber (14) of the dryer body (10) to force air to pass into the sensible heat exchanger (20); and a heater (40) contained in the air flow chamber (14) of the dryer body (10) to convert air, which is supplied by the blowing fan (30), into hot wind for drying and supply the drying chamber (12) with the hot wind.

Abstract: Disclosed are a thermosetting light-reflective resin composition, a method for preparing the same, an optical semiconductor element-mounted reflector produced therefrom, and an optical semiconductor device including the same. More specifically, disclosed are a thermosetting light-reflective resin composition which includes a polyhydric polyol having two or more hydroxyl groups and thus exhibits superior discoloration resistance and entails little deterioration in reflectance, a method for preparing the same, an optical semiconductor element-mounted reflector produced therefrom and an optical semiconductor device including the same.