Abstract: A method and a system thereof for establishing a model for assessing construction site risk levels through deriving BIM-based hazard factors are proposed. The method includes step S110 of collecting similar study trends, step S120 of analyzing a CSI hazard factor profile database, step S130 of collecting construction company development cases and trends, step S200 of establishing a classification system of a risk assessment DB (110) and including step S210 of systematizing a construction site category, step S220 of deriving a quantitative risk level calculation method, and step S230 of analyzing current risk assessment, step S300 of developing a framework and including step S310 of deriving a construction site hazard factor visualization method and step S320 of developing a risk assessment model framework, step S500 of transmitting BIM-based risk assessment model data, and receiving feedback including supplemented data, and step S600 of establishing the BIM-based risk assessment model.

Abstract: A wiper assembly for use in vehicles is provided, including a shaft which is connected to a driving motor via a linkage and rotated by the driving motor, an arm head including a shaft hole into which the shaft is inserted, an arm having one end combined with the arm head by a rotating shaft and rotatable about the rotating shaft and the other end combined with a wiper blade which wipes a window of a vehicle, a locking member which is supported by the arm head and movable between a locking location where the locking member is locked in the shaft so that the shaft cannot be separated from the shaft hole of the arm head and an unlocking location where the locking member is unlocked from the shaft so that the shaft can be separated from the shaft hole of the arm head, and a locking member moving unit which moves in gear with a rotation of the arm so as to move the locking member between the locking location and the unlocking location.

Abstract: A wiper assembly for use in vehicles is provided, including a shaft which is connected to a driving motor via a linkage and rotated by the driving motor, an arm head including a shaft hole into which the shaft is inserted, an arm having one end combined with the arm head by a rotating shaft and rotatable about the rotating shaft and the other end combined with a wiper blade which wipes a window of a vehicle, a locking member which is supported by the arm head and movable between a locking location where the locking member is locked in the shaft so that the shaft cannot be separated from the shaft hole of the arm head and an unlocking location where the locking member is unlocked from the shaft so that the shaft can be separated from the shaft hole of the arm head, and a locking member moving unit which moves in gear with a rotation of the arm so as to move the locking member between the locking location and the unlocking location.