Hidden Markov Models (HMMs). A hidden Markov model models a Markov process, but assumes that there is uncertainty in what state the system is in at any given time. A common metaphor is to think of the HMM as if the Markov Model were a mechanism hidden behind a curtain.
For the scientific journal, see Molecules (journal) . 3D (left and center) and 2D (right) representations of the terpenoid molecule atisane. A molecule (/ËmÉlÉªkjuËl/ from Latin moles mass) is an electrically neutral group of two or more atoms held together by chemical bonds.
Definition. 1  The molecule must be cyclic. 2  The molecule must be planar. 3  The molecule must have a complete conjugated Ï-electron system within the ring. 4  The molecule must have 4n Ï-electrons where n is any integer within the conjugated Ï-system.