A method of chocking a wheel comprises a step of providing a wheel chock. Each panel has a core formed of a metal honeycomb with the core faces having a fiber in resin matrix layer thereon. As a result, it is possible to prevent broadcast storm in which broadcasted frames are repetitively transmitted along a loop in an extended wireless LAN architecture. Pharmaceutical data from a knowledge database is classified with the semantic representation, allowing construction of a set of reasons for any classified pharmaceutical data.