This paper focuses on the construction of authentic rapper identities among Korean rappers throughout the history of rap in Korea. The first part of this study describes the historical development of linguistic practices and available linguistic resources that were commonly exercised and exploited by Korean rappers over time, while the latter part demonstrates how those practices and resources become components constituting and constructing various rapper identities through Eckert's (2008) framework of “indexical field.” The exploration of the Korean rappers' linguistic practices reported that Korean rappers have developed a number of creative and innovative practices throughout the history of Korean rap and hip-hop. The second part revealed that Korean rappers' innovations and creative practices have become more and more complicated over time for more sophisticated rapper identity construction and projection.

In the recent years, composite beam is now being frequently used not only in reduction of the story height but also saving material quantity. There has been heightened interest in composite beam. In this study, new composite beam was proposed, which composed of H-section and U-section members. Angles were used for shear connectors for composite action. In order to investigate the performance of the suggested composite beam, test programs were carried out to evaluate the composite beam's structural behavior and effectiveness as conducted experiments consist of push-out tests, beam flexural tests and beam-column connection tests.