Vol. 20 No. 1/2 (1987)

. A discrete-time digital channel coding, in which the encoder and decoder are both time-invariant finite state machines, is investigated. The channel is assumed to be memoryless. Two measures of performance are considered: the probability of error and the minimum free distance. Greater emphasis is placed on the minimum free distance since it is easier to evaluate than the probability of error criterion, and for small channel crossover probability it is a very good indicator of system performance; it is defined as the Hamming distance between two possible output sequences that correspond to…

. Through an experiment process, an optimum condition of amino acid analysis using High Performance Liquid Chromatography (HPLC) with post- and pre-column derivatization methods has been found. The optimum condition of the analysis for the post-column deriyatization was obtained by using resin cation exchanger (R-SO3Na) as the column, citric acid buffer of the pH 3.0 and boric acid buffer of the pH 9.7 as the mobile phase and O-phtalaldehyde (OPA) /2-mercaptoethanoal as the derivator, In the pre-column derivatization method, Resolve 5μ spherical C18 was used as the column, solution A…