Embossed microstructures within a substrate are used to create narrow and deep holes within that substrate. More specifically, the present invention relates to a method for regeneration of plants of Acacia mangium by culturing explants of immature zygotic embryos on callus induction medium to grow embryogenic tissue. The invention is applicable to comparatively heavy loads such as those transported in shipping containers and in such land vehicles as rail cars and road transport vehicles. The platen roller is provided with a pulse encoder for detecting transporting speed fluctuation amount thereof. A female optical receiving device used to receive an optical guidewire and connect guidewire internal optical fiber to an external relaying optical cable is also provided.