The cable-based retractable membrane roof makes it impossible to maintain its shape and stiffness during driving process, unlike the hard-type retractable roof. Consequently, monitoring using a relatively simple wireless video transmission device is required. However, since video data has a bigger transmission rating than other monitoring data in terms of the structure velocity or acceleration, there is a need to develop transmission device that is easy to install and entails low maintenance cost. This paper studies on a real-time video transmission system for monitoring the cable-based retractable membrane roof while driving. A video transfer software, using the mobile network, is designed and the embedded system is constructed. Ultimately, the data transmission server is tested. Connecting a trolley to the system allows testing of the validity and efficiency of the developed system through the video data transmitted in the driving process. Result of the test shows that the developed system enables multi-device data transfer with monitoring via the mobile network.

In this study, an acceleration sensor that has optical fibers to measure the inclination and acceleration of a structure through contradictory changes in two-component FBG sensors was examined. The proposed method was to ensure precise measurement through the unification of the deformation rate sensor and the angular displacement sensor. A high sensitivity three-axis accelerometer was designed and prepared using this method. To verify the accuracy of the accelerometer, the change in wavelength according to temperature and tension was tested. Then, the change in wavelength of the prepared accelerometer according to the sensor angle, and that of the sensor according to the change in ambient temperature were measured. According to the test results on the FBG-based vibration sensor that was developed using a high-speed vibrator, the range in measurement was 0.7 g or more, wavelength sensitivity, 2150 pm/g or more, and the change in wavelength change, 9.5 pm/℃.

본 논문은 움직이는 객체를 지속적으로 감시관찰하는 CCD 카메라의 자동 제어를 위한 신호 생성 알고리즘을 제시하고 있다. 제안된 알고리즘은 검출된 객체 위치와 영상 중심 사이의 수평 수직 변위들을 계산하고 변위들을 각으로 변환한다. 최종적으로 팬/틸트 신호가 변위각으로부터 생성된다. 제안된 알고리즘의 성능 평가를 위해 자동 제어에서 생성된 데이터와 수동 제어에서 측정된 데이터가 비교되고, 단순한 객체를 이용한 추적 실험이 수행되었다. 실험 결과는 두 데이터의 차이는 무시할 수 있을 정도이고, 팬/틸트 ±52o/±40o 영역에서 움직이는 객체가 ±13o/±10o 영역에 유지되는 것을 보여주고 있다.

In this study, an Wireless Data Transmission Module for Large Spatial Structures has been investigated. An Wireless Data Transmission Mobule was designed with a Zigbee-based wireless communication function and a low-power, a variety of external interface. This was designed using RadioPulse Inc's MG2470-chip with a Zigbee-based wireless communication function, and Power Circuit was designed using Battery. The MG2470-chip is a true 2.4GHz system-on-chip (SoC) designed for low-power, low-cost applications based on the industry standards such as IEEE802.15.4 and RF4CE. The MG2470 involves 8-bit 8051 MCU with internal 64-KB flash memory and 6-KB SRAM. Accordingly, it is possible to development of an optimal firmware.

In this paper, a logger of an earthquake accelerometer in order to link and share the seismic data easily with related institutes is presented. The firmware is embedded into the logger, which transforms the seismic data into the formats, miniSEED.

An accelerometer that has optical fibers to measure the inclination and acceleration of the architectural structures was examined. This was to ensure precise measurement through the unification of the deformation rate sensor and the angular displacement sensor.

The objective of this study is to analyse the dynamic stable and unstable behaviours of a space truss using an accurate solution obtained by the high-order Taylor method. Because numerical solutions can lead to incorrect analyses in the case of a space truss model due to the being parameters large, we analyse the solution’s behaviour using essentially an analytical solution obtained by the multi-step high-order Taylor method. In detail, the dynamic instability and buckling characteristics of the SDOF model under step, sinusoidal and beating excitations are investigated.