Scaling up and scaling out of a server architecture for large scale real-time applications is provided. The medium is made by applying an ink using a Meyer Rod which has varying cell lengths along its length. A bond coat is applied to a local area of the substrate, so that a portion of the substrate remains exposed. The proposed encoding and decoding method can better make use of storage locations of the 2D detector and get a code rate close to 1. The height adjuster includes a guide housing connected to the bottom of the main body; a front leg slidably accommodated in the guide housing; a spring between the guide housing and the front leg and providing elasticity to support a weight of the main body; and a stopper to prevent the front leg from separating from the guide housing. Transportable buildings and building kits comprising connecting assemblies of the invention are also included.