Recently, measuring instruments for SHM of structures has been developed. In general, the wireless transmission of sensor signals, compared to its wired counterpart, is preferable due to the absence of triboelectric noise and elimination of the requirement of a cumbersome cable. However, in extreme environments, the sensor may be less sensitive to temperature changes and to the distance between the sensor and data logger. This may compromise on the performance of the sensor and instrumentation. Therefore, in this paper, free vibration experiments were conducted using wireless MEMS sensors at an actual site. Measurement was assessed in time and frequency domain by changing the temperature variation at(- 8℃, - 12℃ and - 16℃) and the communication distance (20m, 40m, 60m, 80m).

Abstract
 1. 서론
 2. 무선 MEMS 시스템의 통신
  2.1 무선 MEMS 가속도계
  2.2 무선 데이터 수신기
 3. 진동 계측 방법
  3.1 실험 개요
  3.2 실험 방법
 4. 실험 결과
  4.1 20m
   4.1.1 Time history
   4.1.2 Power spectrum
   4.1.3 Damping ratio
  4.2 40m
   4.2.1 Time history
   4.2.2 Power spectrum
   4.2.3 Damping ratio
  4.3 60m
   4.3.1 Time history
   4.3.2 Power spectrum
   4.3.3 Damping ratio
  4.4 80m
 5. 결론
 감사의 글
 References

• 이종호(서울과학기술대학교 건축과, 박사과정, Dept. of Architecture, Seoul National University of Science and Technology) | Lee, Jong-Ho
• 천동진(서울과학기술대학교 건축과, 석사과정, Dept. of Architecture, Seoul National University of Science and Technology) | Cheon, Dong-Jin
• 윤성원(서울과학기술대학교 건축학부 교수, 공학박사, School of Architecture, Seoul National University of Science and Technology) | Yoon, Sung-Won 교신저자