Abstract: A structure for preventing a rotation of a side sill of a vehicle includes: a chassis frame, a vehicle body coupled to an upper portion of the chassis frame, and side sills formed on both end portions of the vehicle body in a width direction of the vehicle. In particular, the structure includes a rotation prevention pin fixed to the side sill. When a side collision occurs and the side sills are pushed in the width direction of the vehicle, the rotation prevention pin is coupled to the chassis frame and thus prevents the rotation of the side sill in the event of the side collision.

Abstract: The present invention relates to a membrane for guided bone tissue regeneration and, more particularly, to a membrane for guided bone tissue regeneration having a structure that silk fibroin nanofibers obtained by removing sericin from silk fibers are formed as a nonwoven, and a manufacturing method thereof. A membrane for guided bone tissue regeneration according to the present invention has a predetermined strength, biocompatibility, and biodegradability, and may maintain a sustained drug release system, when drugs are added in the manufacturing process. Additionally, a membrane for guided bone tissue regeneration according to the present invention may be modified corresponding to the condition of usage, because a thickness of the membrane may be adjusted by controlling fineness of nanofibers, compactness of nanofibers, and pore size of a multiporous structure may be adjusted, in a nonwoven manufacturing process.

Abstract: The present invention relates to a membrane for guided bone tissue regeneration and, more particularly, to a membrane for guided bone tissue regeneration having a structure that silk fibroin nanofibers obtained by removing sericin from silk fibers are formed as a nonwoven, and a manufacturing method thereof. A membrane for guided bone tissue regeneration according to the present invention has a predetermined strength, biocompatibility, and biodegradability, and may maintain a sustained drug release system, when drugs are added in the manufacturing process. Additionally, a membrane for guided bone tissue regeneration according to the present invention may be modified corresponding to the condition of usage, because a thickness of the membrane may be adjusted by controlling fineness of nanofibers, compactness of nanofibers, and pore size of a multiporous structure may be adjusted, in a nonwoven manufacturing process.