Perceived Discrimination as a Critical Factor Affecting Self-Esteem, Satisfaction with Physical Appearance and Depression of Racial/Ethnic Minority Adolescents in Korea.

The effect of perceived discrimination on adolescents' developmental outcome has long been a topic of research, however, little is known about how it affects their depression especially among the racial/ethnic minority adolescents in Asian countries. In Korea, a country with a relatively short history of immigrant influx, discrimination has become an important social issue affecting a rapidly growing population. This study examines the impact of perceived discrimination on racial/ethnic minority adolescents in Korea, specifically focusing on its impact on depression through self-esteem and satisfaction with physical appearance. The Multicultural Adolescents Panel Study data were used for analyses, and the SPSS Process Macro program was used to test the parallel mediating effects of self-esteem and satisfaction with physical appearance. The findings show that perceived discrimination was a strong predictor of their depression. Self-esteem and satisfaction with physical appearance also had significant mediating effect. There were no distinct gender differences among paths though the male adolescents were found to have more discriminatory experiences than the female adolescents. The findings call for the development of healthy coping strategies for these adolescents to prevent the effect of perceived discrimination, not only for their mental health, but also with their self-perception including physical appearance.

A Novel Soft Pneumatic Artificial Muscle with High-Contraction Ratio.

There is a growing interest in soft actuators for human-friendly robotic applications. However, it is very challenging for conventional soft actuators to achieve both a large working distance and high force. To address this problem, we present a high-contraction ratio pneumatic artificial muscle (HCRPAM), which has a novel actuation concept. The HCRPAM can contract substantially while generating a large force suitable for a wide range of robotic applications. Our proposed prototyping method allows for an easy and quick fabrication, considering various design variables. We derived a mathematical model using a virtual work principle, and validated the model experimentally. We conducted simulations for the design optimization using this model. Our experimental results show that the HCRPAM has a 183.3% larger contraction ratio and 37.1% higher force output than the conventional pneumatic artificial muscle (McKibben muscle). Furthermore, the actuator has a compatible position tracking performance of 1.0 Hz and relatively low hysteresis error of 4.8%. Finally, we discussed the controllable bending characteristics of the HCRPAM, which uses heterogeneous materials and has an asymmetrical structure to make it comfortable for a human to wear.