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마름병 병원균 Pseudomonas solanacearum의 병원성 상실요인에 관하여
김을제,윤경란,이영하,이청호,박지창,최광태 한국연초학회 1990 한국연초학회지 Vol.12 No.1
To study the determinants which are involved in the loss of pathogenicity in wilt-inducing Pseudomoms solamcewum, several physlologica I functions were compared in a virulent P. solanacearum strain and an avirulent, spontaneously derived mutant strain. The polyacrylamide gel electrophoresis showed the distinction between two strains in the patterns and the relative intensity of proteins produced intracellularly or extracellularly. Enzyme assays showed that the level of polygalacturonase activity in the culture filtrate of the avirulent mutant was markedly reduced, while carboxymethylcellulase(rondoglucanase) activity in both strains were nearly negligible. These results suggest that the loss of pathogenicity in mutant strain is attributed in part to the reduced production of polygalacturonase. In audit ion, comparative analyses by agarose gel electrophoresis of DNA molecules isolated from both strains show that the pathogenicity genes of p. solanaceerum are not located on plasmid but are on chromosome.
배명진,김을제,안수길,Bae, Myung-Jin,Kim, Ul-Je,Ahn, Sou-Guil 한국음향학회 1991 韓國音響學會誌 Vol.10 No.3
연속음 인식을 위해서는 음성신호의 음성학적 경계를 결정짓는 분할과정이 필요하다. 본 논문에서는 음성신호의 전이구간을 결정하기 위한 퍼래미터로 한 프레임내의 규준화된 AMDF을 제안하였다. 제안된 규준화된 AMDF은 그 프레임에서 음성진폭의 변화율을 대별하며, 인근 프레임의 규준화된 AMDF와 비교하면 현재의 프레임이 정상상태 혹은 전이영역에 있는지를 구별할 수 있게 해준다. To recognize continued speech, it is necessary to segment the connected acoustic signal into phonetic units. In this paper, as a parameter to detect the transition regions in continued speech, we propose a new noramlized AMDF. The suggested parameter represents a change rate of magnitude of speech signals. As comparing this value with the adjactent frames value the state of the frames can be distinguished as a level between the steady state and transient state.