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이기희,임인칠 대한전자공학회 1995 전자공학회논문지-B Vol.b32 No.5
This paper describes a speaker adaptation method to improve the recognition performance of MLP(multiLayer Perceptron) based HMM(Hidden Markov Model) speech recognizer. In this method, we use lst-order linear transformation network to fit data of a new speaker to the MLP. Transformation parameters are adjusted by back-propagating classification error to the transformation network while leaving the MLP classifier fixed. The recognition system is based on semicontinuous HMM's which use the MLP as a fuzzy vector quantizer. The experimental results show that rapid speaker adaptation resulting in high recognition performance can be accomplished by this method. Namely, for supervised adaptation, the error rate is signifecantly reduced from 9.2% for the baseline system to 5.6% after speaker adaptation. And for unsupervised adaptation, the error rate is reduced to 5.1%, without any information from new speakers.
제한적 상태지속시간을 갖는 HMM을 이용한 고립단어 인식
이기희,임인칠 대한전자공학회 1995 전자공학회논문지-B Vol.b32 No.5
In this paper, we proposed MLP(MultiLayer Perceptron) based HMM's(Hidden Markov Models) with bounded state duration for isolated word recognition. The minimum and maximum state duration for each state of a HMM are estimated during the training phase and used as parameters of constraining state transition in a recognition phase. The procedure for estimating these parameters and the recognition algorithm using the proposed HMM's are also described. Speaker independent isolated word recognition experiments using a vocabulary of 10 city names and 11 digits indicate that recognition rate can be improved by adjusting the minimum state durations.
모기유충에 대한 살충성 Bacillus thuringiensis H9B 균주의 특성
이기희,김광현,김병우 한국산업미생물학회 1993 한국미생물·생명공학회지 Vol.21 No.5
모기유충에 독성을 나타내는 B. thuringiensis H9B 균주를 토양에서 분리선별하였다. Bt H9B 균주의 생화학적 특성과 편모항원응집 반응시험에서 Btd와 아주 유사하였다. Bt H9B 균주의 내독소는 Btd 73E10-2의 내독소와 이중면역확산시험에서 완전히 일치하는 침강선을 나타내었다. Bt H9B 균주의 내독소와 Bti의 내독소를 0.1 N NaOH 용액에 용해하여 SDS-Polyacrylamide gel 상에서 전기영동한 결과 Bti의 내독소에는 용혈성 단백질 (28 kd)이 함유되어 있음을 확인하였으나 Bt H9B 균주의 내독소에는 28 kd의 단백질 단편이 존재하지 않았다. 내독소의 모기유충(A. aegypti)에 대한 독성시험에서 Bt H9B 균주의 LC_(50)는 70 ng/㎖였고, Bti의 내독소와 Btd 73E10-2의 내독소의 LC_(50)는 각각 26 ng/㎖와 186 ng/㎖로서 Bt H9B 균주의 내독소는 Btd 73E10-2의 내독소에 비해 약 2∼3배 정도 모기유충에 대해 강한 독성을 나타내었으며, 또한 적혈구에 대한 용혈성은 Bt H9B 균주의 내독소가 Btd 73E10-2의 내독소 보다 약 2배 정도 강하게 나타났다. One strain of mosquitocidal Bacillus thuringiensis, H9B, was isolated from soil. The biochemical characteristics and flagella antigenicity of the strain H9B is similar to that of B. thuringiensis subsp. darmstadiensis. The delta-endotoxin of the strain H9B coincided with that of B. thuringiensis subsp. darmstadiensis strain 73E10-2 on agarose double immunodiffusion test. The delta-endotoxin of B. thuringiensis subsp. israelensis contains hemolysin fragment (28 kd) on SDS-PAGE when the delta-endotoxin was solubilized in alkali, while that of the strain H9B does not contain 28 kd protein. In the biological activity, the delta-endotoxin of strain H9B was 2 or 3 times stronger than that of the strain 73E10-2; The LC_(50) against mosquito larvae (Aedes agypti) of delta-endotoxin from the strain H9B is 70 ng/㎖, and that from B. thuringiensis subsp. israelensis and the strain 73E10-2 is 26 ng/㎖, 186 ng/㎖ respectively.; The hemolytic activity of delta-endotoxin from the strain H9B has twice stronger than that from the strain 73E10-2.