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김치엽,최만용,권일범,이승석 한국비파괴검사학회 2003 학술대회 논문집 Vol.- No.1
Structural health monitoring system should developed to be based on internet and database technology in order to manage efficiently large structures. This system is operated by internet connected with the side of structures. The monitoring system has some functions: self monitoring, self diagnosis, and self control etc. Self monitoring is the function of sensor fault detection. If some sensors are not normally worked, then this system can detect the fault sensors. Also Self diagnosis function repair the abnormal condition of sensors. And self control is the repair function of the monitoring system. Especially, the monitoring system can identify the replacement of sensors. For further study, the real application test will be performed to check some unconvinrences.
김치엽,권일범 한국비파괴검사학회 2004 한국비파괴검사학회지 Vol.24 No.5
현대의 대형 건물은 복잡한 전기 배선 또는 가스 배관 등의 설비를 갖추고 있어서 다양한 화재 사고가 발생할 가능성이 커졌다. 이에 따라 무선의 다점 온도 측정 센서를 손쉽게 여리 위치에 설치 가능하도록 저렴하게 개발하여 적용함에 의하여 화재를 조기에 탐지하고 그 피해의 크기를 최소화하는 것이 필요하다. 무선 온도 센서의 송신기는 4채널로 9600 bps의 전송속도와, 10 mW의 출력으로 915 MHz 통신 주파수를 갖고 수신기와 작동되도록 구성하였다. 온도범위 -55 ~ 150도 사이에서 사용할 수 있도록 검증된 반도체 온도 센서 소자를 기본으로 사용하여 4개의 채널을 구성하고 실험을 수행한 곁과 개발된 센서 시스템이 화재 탐지용으로 적용이 가능함을 확인하였다. Fire accidents often happen in large buildings because large buildings are equipped with heavy electrical wiring and piping. When fire is to be occurred in those buildings, it is very dangerous to people and building structures. Therefore, multi-point wireless temperature sensors for large buildings arc necessary in order to detect fire in the early time and thus to minimize the loss. A wireless device was composed of the transmitter and receiver. The specification of this device was as follows: 915 MHz of transmitted frequency, 4 channels, 9600bps of the transmitted speed, and 10 mW of the transmitted power. We confirmed through experiment that the temperature was well sensed and fire location was determined by the 4 channel sensors of the developed sensor system.
김치엽 ( Kim Chi-yeop ),권일범 ( Kwon Il-bum ),최만용 ( Choi Man-yong ) 한국구조물진단유지관리공학회 1999 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.3 No.1
The remote wireless measurement device was constructed to apply to the monitoring of the structural health status. The device was composed of the transmitter and receiver. The specification of this device was as follows: 900MHz of transmitted frequency, 8 channels, 50 kbps of the transmitted speed, and 5mW of the transmitted power. The strain transmition test was performed to verify the performance of this device. This device was well operated to transmite the 150 Hz strain, even though shown to transmit the 10 Hz strain in this paper.
김치엽 ( Kim¸ Chi-yeop ),권일범 ( Kwon¸ Il-bum ),최만용 ( Choi¸ Man-yong ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.2
The remote wireless measurement device was instrumented to measure the stress distribution of structures. This device was composed of the data recorder, transmitter and receiver with PC interface. The specification of this device was as follows: Analog inputs of 8 channels, 400 MHz transmitted frequency, and the transmitted power of 5 mW. This device was manufactured as the sending and receiving system of long-term strains to calculate the stress distribution. The 4 channel strains of 150 Hz was well transmitted by this device. Also, these strain data was able to show the stress distribution of the experimental specimen. Futhermore, the data quantity was equal to the data quantity during three months at 1 hour sampling time.
김치엽(Chi-Yeop Kim),권일범(Il-Bum Kwon),최만용(Man-Yong Choi) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
The wireless measurement device was instrumented to measure the stress distribution of structures. This<br/> device was composed of the data recorder, transmitter and receiver with PC interface. The specification of this<br/> device was as follows: Analog inputs of 8 channels, 400 MHz transmitted frequency, and the transmitted<br/> power of 5 mW. This device was manufactured as the sending and receiving system of long-term strains to<br/> calculate the stress distribution. The 4 channel strains of 150 Hz were well transmitted by this device. Also,<br/> these strain data was able to show the stress distribution of the experimental specimen. Futhermore, the data<br/> quantity was equal to the data quantity during three months at 1 hour sampling time.