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Homogeneous Centroid Neural Network에 의한 Tied Mixture HMM의 군집화
박동철,김우성,Park Dong-Chul,Kim Woo-Sung 한국통신학회 2006 韓國通信學會論文誌 Vol.31 No.9C
음성인식에서 TMHMM(Tied Mixture Hidden Markov Model)은 자유 매개변수의 수를 감소시키기 위한 좋은 접근이지만, GPDF(Gaussian Probability Density Function) 군집화 오류에 의해 음성인식의 오류를 발생시켰다. 본 논문은 TMHMM에서 발생하는 군집화 오류를 최소화하기 위하여 HCNN(Homogeneous Centroid Neural Network) 군집화 알고리즘을 제안한다. 제안된 알고리즘은 CNN(Centroid Neural Network)을 TMHMM상의 음향 특징벡터에 활용하였으며, 다른 상태에 소속된 확률밀도가 서로 겹쳐진 형태의 이질군집 지역에 더 많은 코드벡터를 할당하기 위해서 본 논문에서 새로 제안이 제안되는 이질성 거리척도를 사용 하였다. 제안된 알고리즘을 한국어 고립 숫자단어의 인식문제에 적용한 결과, 기존 K-means 알고리즘이나 CNN보다 각각 14.63%, 9,39%의 오인식률의 감소를 얻을 수 있었다. TMHMM(Tied Mixture Hidden Markov Model) is an important approach to reduce the number of free parameters in speech recognition. However, this model suffers from a degradation in recognition accuracy due to its GPDF (Gaussian Probability Density Function) clustering error. This paper proposes a clustering algorithm, called HCNN(Homogeneous Centroid Neural network), to cluster acoustic feature vectors in TMHMM. Moreover, the HCNN uses the heterogeneous distance measure to allocate more code vectors in the heterogeneous areas where probability densities of different states overlap each other. When applied to Korean digit isolated word recognition, the HCNN reduces the error rate by 9.39% over CNN clustering, and 14.63% over the traditional K-means clustering.
금수육군전(金水六君煎)이 피크로메터에 의한 호흡곤란(呼吸困難)에 미치는 임상적(臨床的) 고찰(考察)
전종철,박동일,김종순,Jeon, Jong-Chul,Park, Dong-Il,Kim, Jong-Soon 대한한방내과학회 2000 大韓韓方內科學會誌 Vol.21 No.4
Objective : The investigation had been performed since from January 1st to August 31th of 1998. The patients for the experiment were mainly composed of patients who had trouble in breathing due to the pneumonectasis, asthmas, pneumonias. The percent of men is 67% in sex distribution and the ratio of persons over 50's was 85%, The effect was invastgated for the labored respiration who had Keumsuyukunjeon. Methods : In this research, some remarkable results are referred which were detected by measuring the variations of the breathing volume of 20 patients after taking Keumsuyukunjeon. Picrometer is used for the measurement of the volume. Results : From the relations between the breathing volume before treatment and the enhancement ratio, the increase of the enhancement ratio and the better response to the medicine were shown to the more serious patients. The period of treatment was 27.5 days average. The enhancement ratio of smoker was 23, and that of non-smoker was 50. At the test of relation between the trouble rate in breathing and the enhancement ratio, Grade ill shows the highest enhancement value 50%. conclusions : It is found that Keumsuyukunjeon gives a noticeable benefit for the patients whose main symptom was breathing problem. Long-term treatments for the serious and aged patients will make much more efficient to the reduction of the symptoms.
PC-BLRNN을 이용한 무선 비동기 전송 채널 등화기
박동철,이실,Park, Dong-Chul,Lee, Sil 한국통신학회 2001 韓國通信學會論文誌 Vol.26 No.8
PC-BLRNN을 이용한 무선 비동기 전송 채널 등화기가 본 논문에서 제안되었다. BLRNN은 쌍선형 다항식에 기초한 것으로 MLPNN 형태의 신경망보다 비선형 시스템의 모델링에 탁월한 성능을 보여왔으므로, 매우 비선형적이고 시계열적 특성을 가지는 무선 비동기 전송 채널 등화기에 이용될 수 있다. PC-BLRNN 등화기가 QPSK 신호에 대해 C-DFE, C-MLPNN 등화기 등과 실험적으로 비교되었는데 그 결과, 기존의 등화기들 보다 제안된 PC-BLRNN 등화기가 MSE와 BER의 성능에서 모두 매우 향상된 결과를 보여주었다.
류마티스성 승모판 협착증을 동반한 뇌경색 환자의 치험 1예
전종철,감철우,박동일,정광식,Jeon, Jong-Chul,Gam, Chul-Woo,Park, Dong-Il,Jeong, Gwang-Sik 대한한방내과학회 2001 大韓韓方內科學會誌 Vol.22 No.3
Valvular heart disease is one of the main current of cardiac problems and has many problems must be solved by sequelae and complications, etc. Rheumatic Mitral Stenosis is mainly attacked by rheumatic fever and developed by process of treatment of mitral valve or formation of trace. The purpose of this study is to examine the efficacy of oriental treatment for Cerebral Infarction with Rheumatic Mitral Stenosis. At the time of visiting ER, he was shown the symptoms of dull mentality, Rt. hemiplegia, global aphasia, dysphagia, chest discomfort, insomnia, dyspnea, etc, It showed that Atrial fibrillation in EKG monitoring, Atrial fibrillation, Rheumatic Mitral Stenosis, Ejection-Fraction slope 60% in Cardiac echography, Lt. atrial hypertrophy, Rt. atrial hypertrophy, Rt. ventricular hypertrophy with pulmonary congestion in chest X-ray. From the view of oriental diagnostic criteria. We classified the patient's clinical conditions and treated accordingly. As a result of treatment, symptoms were markedly improved and he was discharged. Further elaboration of oriental diagnostic classification could possibly lead to the fundamental treatment.