This study was carried out on the upgrading of the noise barrier top device developed by 400km/h high speed railway infra research. By modifying the inner shape of the top device installed on noise barrier top, the performance of the first-stage top device was improved, and the weight was greatly reduced as compared with the first stage top device. In addition, the upper part was completed without an installation fixture by the integral method, and the construction was greatly improved. Finally, the upgraded top device was installed on the HONAM high speed railway site and its performance was verified.

Abstract
 1. 서 론
 2. 개발내용 및 평가계획
 3. 검증결과 및 고찰
 4. 결 론
 참고문헌

• 장강석(유니슨테크놀러지(주) PM) | Jang, Kang Seok
• 서효선(유니슨테크놀러지(주)) | Seo, Hyo Sun 교신저자
• 최찬용(한국철도기술연구원) | Choi, Chan Yong 교신저자