This study aims to optimize the cochlea-inspired artificial filter bank (CAFB) using El-Centro seismic waveforms and test its performance through a shaking table test on a two-span bridge model. In the process of optimizing the CAFB, El-Centro seismic waveforms were used for the purpose of evaluating how they would affect the optimizing process. Next, the optimized CAFB was embedded in the developed wireless-based intelligent data acquisition (IDAQ) system to enable response measurement in real-time. For its performance evaluation to obtain a seismic response in real-time using the optimized CAFB, a two-span bridge (model structures) was installed in a large shaking table, and a seismic response experiment was carried out on it with El-Centro seismic waveforms. The CAFB optimized in this experiment was able to obtain the seismic response in real-time by compressing it using the embedded wireless-based IDAQ system while the obtained compressed signals were compared with the original signal (un-compressed signal). The results of the experiment showed that the compressed signals were superior to the raw signal in response performance, as well as in data compression effect. They also proved that the CAFB was able to compress response signals effectively in real-time even under seismic conditions. Therefore, this paper established that the CAFB optimized by being embedded in the wireless-based IDAQ system was an economical and efficient data compression sensing technology for measuring and monitoring the seismic response in real-time from structures based on the wireless sensor networks (WSNs).

In this study, SMG(Smart Material with Grease) was developed, which was improved the precipitation minute particle in grease during long term standstill. Also, small-sized cylinder damper equipped with an electromagnet in a piston was developed for using a performance evaluation of the damper with SMG and the dynamic load test, and damping force using Power model and Bingham model was derived in order to compare to the result of that of the damper. The data obtained from the dynamic load test were analyzed and plotted, and then a dynamic range was calculated to evaluate the usability of the damper with SMG. The performance of the damper with SMG was compared to the damping forse derived from the Power and Bingham model. The result of this evaluation shown that the usability of SMG damper was demonstrated by this test as a semi-active controlling equipment of small-sized damper.

This research focuses on developing the Smart material with Grease adopted as a base oil to overcome a particle deposition caused by the MR fluid consisting of a silicon, which maximizing the characteristics and advantage of the MR fluid. By adopting the SMG fluid to a shear damper, this paper aimed to evaluate the control performance of it according to the variation of intensity of electric current(0 A, 0.5 A, 1.0 A, 1.5 A, 2.0 A, 2.5 A) and frequency(0.5 Hz, 1 Hz, 2 Hz). Subsequently, the usability of the SMG damper was analyzed by comparing the dynamic model of it to that of the other types of dampers(Power(Involution) Model, Bingham Model). As a result, DR, the performance indicator of semi-active damper, shows approximately 5 in a condition of 2 Hz. Also while confirming the excellent performance like the Power and the Bingham model, it raises the possibility to exploit it as the semi-active damper.

이 연구의 목적은 대형 구조불의 상설 감지를 위한 감지기의 최적 위치의 얄고리츰윷 개발하는데에 있다. 구조물 의 진동을 이용한 감지 시 스템은 장기적 으로 계 속해서 구조물을 자동으로 감지하는데에 좋은 방법 증의 하나이다. 하지만 구조물의 진동융 정확히 계측하기 위해서 는 감지기의 위치나 감지기의 숫자에 콘 영향을 받는데， 이와 같은 일은 대형 구조물에 있어서 쉽지가 않다. 최적의 감지기 위치와 최소의 감지기로 가장 정확한 데이터를 획득하기 위하여 최적합한 감지기의 위치를 위한 알고려즘이 개발되어 수치 적 그리고 실험적으로 유용성 을 보인다. EOT가 개발되어 모형 교량에 적용하여 EIM과 비교 분석된다 이 들의 비교를 똥하여， 이 연구에서 제안되어진 EOT가 적 은 수의 감지기로 좋은 걸과를 보여， 상설감지의 복적에 적합함을 보여 준다.

If the MR fluid damper does not work, the magnetic powder (carbonyl iron powder) will sediment. To overcome this problem, we developed an EMR (Enhanced Magneto Rheological Fluid) fluid and evaluated control performance. For the dynamic load test using MR fluid and EMR fluid was conducted to evaluate control power and DR (Dynamic Range). In the damper performance test, the current was tested at intervals of 0.5A from 0.0A to 2.5A, and the control power of the EMR fluid was 84% compared to the control power of the MR fluid, The DR of the EMR Damper was 7.5. When the DR is 5.0 or higher, it is generally used as a semi-active control device. Therefore, the EMR fluid has proved its usability as a semi-active control device by showing 7.5 DR to 76% control performance of existing MR damper.

Among various image acquiring technologies which are based on electromagnetic waves, the frequently used imaging technologies in various industries and remote diagnostics, such as spectral, thermal, mm-wave, microwave and short-wave imaging are analyzed in their characteristics and their perspectives as the major diagnostic technologies in public safety areas are described.

In this study, we adapted very low resolution (240x320 = 76,800 pixels) images by which it is difficult to detect cracks. An automatic crack detection technique has been studied using digital image processing technology for low resolution images of sewage pipeline. Authors have developed two algorithms to detect cracks. The third step covers an algorithm developed to find optimal threshold value, and the sixth step deals with algorithm to determine cracks. As the result, in spite of very low-resolution images, the performance of crack detection turned out to be excellent.