In this paper, we implement a portable bioelectric signal measurement system for the safety of industrial workers. The developed system consists of two parts: the one is boielectric signal measurement unit and the other is signal analyzer system with PDA. The former includes signal processing part, A/D convertor, and 8051 based microprocessor, the latter includes software for signal analysis and display. The developed system detects industrial worker's ECG and displays and stores it to PDA. The ECG data in PDA can be transmitted to PC located in a distance, allowing a doctor to review the ECG and make a treatment decision. A doctor analyzes the ECG data and gives medical treatment to industrial worker.

In this study, the risk matrix method was applied to reduce the number of post-tension survey in maintenance. The risk matrix weights and evaluation indexes were studied according to the maintenance system.

In this study, the risk matrix method was applied to reduce the number of post-tension survey in maintenance. The risk matrix weights and evaluation indexes were studied according to the maintenance system.