Abstract: Provided is a seismic vulnerability analysis system of a user's living space. The system includes: an image receiving unit configured to receive image information obtained by photographing a living space, where various things are disposed, through a camera; an image signal processing unit configured to recognize the thing photographed in the image information as an object, extract a position and size of the object in a three-dimensional space, and convert the extracted position and size into spatial information; and an earthquake simulation unit configured to simulate motion phenomena of the objects in the space when an earthquake occurs according to simulated seismic conditions based on the spatial information.

Abstract: Provided is a seismic vulnerability analysis system of a user's living space. The system includes: an image receiving unit configured to receive image information obtained by photographing a living space, where various things are disposed, through a camera; an image signal processing unit configured to recognize the thing photographed in the image information as an object, extract a position and size of the object in a three-dimensional space, and convert the extracted position and size into spatial information; and an earthquake simulation unit configured to simulate motion phenomena of the objects in the space when an earthquake occurs according to simulated seismic conditions based on the spatial information.

Abstract: Provided is an underground environment change detection method including: repeatedly sensing an AC signal propagated through an underground in a magnetic induction manner; and monitoring an underground environment change from a change in the AC signal.

Abstract: Disclosed is a method and apparatus for measuring in-situ stress in rock using a thermal crack. The method involves forming a borehole, cooling a wall of the borehole, applying tensile thermal stress, forming a crack in the borehole wall, and measuring temperature and cracking point. Afterwards, the borehole wall is heated to close the formed crack, the borehole wall is cooled again to re-open the crack, and temperature is measured when the crack is re-opened. The in-situ stress of the rock is calculated using a first cracking temperature at which the crack is formed and a second cracking temperature at which the crack is re-opened. Further, the apparatus cools, heats and re-cools the borehole wall, thereby measuring the first cracking temperature, the second cracking temperature, and the cracking point.

Abstract: Disclosed is a method and apparatus for measuring in-situ stress in rock using a thermal crack. The method involves forming a borehole, cooling a wall of the borehole, applying tensile thermal stress, forming a crack in the borehole wall, and measuring temperature and cracking point. Afterwards, the borehole wall is heated to close the formed crack, the borehole wall is cooled again to re-open the crack, and temperature is measured when the crack is re-opened. The in-situ stress of the rock is calculated using a first cracking temperature at which the crack is formed and a second cracking temperature at which the crack is re-opened. Further, the apparatus cools, heats and re-cools the borehole wall, thereby measuring the first cracking temperature, the second cracking temperature, and the cracking point.