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ECG 형태에 의한 자동화된 pacing 문턱 전압 결정에 관한 연구
김정국,허웅,Kim, J.,Huh, W. 대한의용생체공학회 2001 의공학회지 Vol.22 No.3
Proper determination of pacing threshold is important for patient safety and pacemaker longevity. In general, cardiac muscle contractions caused by pacing pulses are verified by observing the morphology of surface ECG displayed on a monitor. In this study, a method of automatic pacing threshold determination based on morphological difference between intrinsic and paced ECGs was developed. First, characteristics of intrinsic ECG and paced ECG were analyzed in time and frequency domain and a proper discrimination parameter was extracted. Then, the automatic capture verification method based on the parameter was developed and applied to 23 pacemaker patients. The selected parameter was the area of ventricular depolarization wave during 80ms after pacing stimulus. It was found that the method was reliable and effective in identifying paced ECG and, thereby, determing a proper pacing threshold.
Axlebox Bearing Temperature Monitoring Using Infrared Camera
J. Kim(김정국) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
Failure of the axle bearing in railway vehicle poses a risk to the safe operation of the railway vehicle. In addition, in Europe, it is mandatory to install on-board for high-speed rail vehicles over 250 km/h to monitor axle conditions. In this study, a real-time axle bearing temperature monitoring system was developed for railway vehicle based on infrared thermography technology. The existing product installed a temperature sensor in an axle box to monitor the temperature of the axle box in one-point manner, but the system manufactured in this research could monitor the whole axle box by monitoring thermal image to ensure reliability of temperature detection. The system developed in this study has a temperature resolution of 1℃ and can be measured up to 300℃. The performance test was conducted by mounting the developed bearing temperature monitoring system in an actual bearing tester, and it was verified that the temperature could be monitored in an area of 0.2 × 0.2 m and could be used even in actual conditions. In this paper, the development and performance evaluation of the system will be introduced.