Abstract: Disclosed is a method of monitoring a problem related to a railroad car by a railroad car monitoring apparatus, the method including: selecting a monitoring target of the railroad car; selecting a diagnosis reference related to the monitoring target; measuring travelling data related to the monitoring target while the railroad car travels; drawing a result value of the characteristic function according to the travelling data and comparing each of the travelling data with a reference value in a normal state and determining whether a defect is generated in the monitoring target.

Abstract: Disclosed is a method of monitoring a problem related to a railroad car by a railroad car monitoring apparatus, the method including: selecting a monitoring target of the railroad car; selecting a diagnosis reference related to the monitoring target; measuring travelling data related to the monitoring target while the railroad car travels; drawing a result value of the characteristic function according to the travelling data and comparing each of the travelling data with a reference value in a normal state and determining whether a defect is generated in the monitoring target.

Abstract: A method for a large space structure collapse detection apparatus to detect collapse of a large space structure according to the present invention includes: measuring a change in external load with respect to at least one main member in the large structure; calculating a stress or stress sensitivity according to the measured change in the external load; and comparing at least one of the calculated stress or the calculated stress sensitivity with a predetermined collapse diagnosis reference value and determining a risk of collapse of the large space structure.