Abstract:This study has attempted to figure out the effects of the surface heat of perm rods on hair. For this, after forming perm waves, hair damage and its causes have been investigated with a different hair bleach method. If hair was bleached immediately without shampooing after a perm using the heat of rods, great perm waves were formed. However, severe damage was found on the hair because of the heated rods. In addition, when hair was shampooed and dried after the perm, hair bleach was more effective. It has been confirmed that hair was damaged because of high temperature of the surface of the rods. In fact, the heated rods had a direct effect on hair damage. According to these results, it has been confirmed that heat-based perms can accelerate hair damage. Therefore, it is necessary to perform a study on the minimization of the heating of permanent tools.
This paper presents the design and linearization of hign efficiency dual mode amplifier. A dual mode transmitter requires an mplifier which generates different output level for different applcations. For WiBro, the output is 1 W at 2.3GHz, andfor wireless LAN the output is less than lOOmW at 2. 4GHz, A bias switching amplifier is designed to get the higher efficiency at both applications With bias switching the amplifier shows the efficiency improvement of up to 25% point. This paper also shows the possibility of linearity improvement for the dual mode amplifier by using predistortion techniquea
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