The heat temperature of a light emitting diode (LED) is investigated with the thermoelectric device (TED). The Peltier effect of the thermoelectric device is used to control the heat radiation and the junction temperature of high-power LEDs. For the typical specific current (350 mA) of high-power (1 W) LEDs, the LED temperature and the p-n junction temperature become 64.5 o C and 79.1 o C, respectively. For 0.1∼0.2 W driving power of TED, the LED temperature and the junction temperature are reduced to be 54.2 o C and 68.9 o C, respectively.As the driving power of the TED increases over 0.2 W, the temperature of LED itself and the junction temperature are increased due to the heat reversed from the heat-sink to LED.As the difference of temperature between LED and the heat-sink is increased, the quantity of reversed heat becomes larger and it results to degrade the cooling capability of TED.

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The aim of this study was to identify a variables that can affect Commitment to a Career Choice focusing mainly on the satisfaction with one's major in college and personal agency beliefs. This research carried out a survey on a total of 626 students at 4-year public and private university. The information is processed using the SPSSWIN19.0 program, which carried out frequency analysis, reliability measurement, one-way ANOVA, linear regression analysis, multiple moderating regression analysis, and three-step mediate regression analysis. The results of this study showed that groups showing greater satisfaction with their major had a higher level of commitment to a career choice. Personal beliefs was one thing that can achieve partial mediation or complete mediation when it comes to the relationship between the satisfaction of their major and commitment to a career choice.