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Sn- Bronze 계 마찰재료의 소결중 미세조직의 변화
김주완,송영두,강복석,강수석,강석중 대한금속재료학회(대한금속학회) 1989 대한금속·재료학회지 Vol.27 No.2
The microstrure evolution of a 78.0 Cu-7.1 Sn-12.5 Fe-2.4 Pb(wt%) alloy, metal composition of a typical Cu-Sn base friction material, has been studied during pressure (1.5 Mpa) and pressureless sintering up to 810℃ for various times. Overall microstructural changes during sintering were found to be determined by the reaction between Cu and Sn. The Sn melts upon heating spread alone the capillaries leaving pores at their sites and form ε phase. The pores collapsed during subsequent pressure sintering at higher temperatures. Upon heating ε phase appeared to transform into γ and β phases, which remelted eventually by reverse peritectic reactions. Fores, however, formed again at the sites of the intermediate phases, when the sintering pressure was relieved in the temperature range of peritectic reactions. Remelting of the intermediate phases could thus enlarge the size of pores in Cu-Sn base materials. A good homogeneous microstructure was obtained after sintering at 810℃ for about 1 hr under 1.5 Mpa.
X선진단 정확성에 관한 고찰 -이중판독의 중요성을 중심으로-
김주완 대한영상의학회 1973 대한영상의학회지 Vol.9 No.1
The photofluorography is the single best method for mass survey for defection of chest diseases, especially for determination of the pulmonary tuberculosis. However, the reliability of photofluorography as a diagnostic method is mostly depend upon quality of films, reader's perceptual experiences and his knowledge on chest diseases, and upon the process of interpretation, i.e., interpretation by single or dual reading. A statistical analysis and discussion were made on the results of 1,394,581 photofluorograms in the mass survey which had carried out from 1969 to 1971. Results were as follows: 1. The ratio of positive cases to all examinees shows a range of 1.45%-4.05%. 2. The most frequent disease in the positive cases was minimal pulmonary tuberculosis. 3. There it showed good expectancy for detecting positive cases at the second reading which was interpreted by experienced radiologists than at the first reading done by the other doctors. It gives an accent one an importance of dual reading by the experienced radiologists for the higher reliability in diagnosis of chest disease.
김주완,이세원,박호종,Kim, Ju-Wan,Lee, Se-Won,Park, Ho-Chong 한국음향학회 2011 韓國音響學會誌 Vol.30 No.3
본 논문에서는 청각 기억 게임을 위하여 두 개의 소리 파형을 비교하여 파형의 리듬 유사도를 정량적으로 측정하는 기술을 제안한다. 제안한 방법은 두 입력 파형에 대하여 에너지 변화, 에너지 피크의 지속 시간, 음색 등을 분석하여 각 파형에 포함된 비트 위치를 검출하고, 두 파형의 템포 차이와 비트 수의 차이를 보상하는 과정을 통하여 두 파형의 리듬 벡터를 각각 정의한다. 다음, 두 리듬 벡터 사이의 차이와 비트 수의 차이를 적용하여 두 입력 파형의 리듬 유사도를 정량적으로 표현하는 식을 정의한다. 제안한 방법으로 측정한 리듬 유사도와 주관적 청취 평가로 측정한 리듬 유사도를 비교하였으며, 두 방법에 의한 리듬 유사도가 상관도 0.86을 가지는 것을 확인하였다. In this paper, a method for measuring rhythmic similarity between two sound signals for auditory memory game is proposed. The proposed method analyzes energy fluctuation, the temporal duration of energy peak, the timbre of two signals, and detects beat positions for each signal. Then, it determines the rhythm vector after compensating a difference in tempo and the number of beats between two signals. Finally, a method for rhythmic similarity measurement is defined as a function of the dissimilarity between two rhythm vectors and a difference in the number of beats. The rhythmic similarity measured by the proposed method and that by the subjective listening test are compared, and the correlation of 0.86 between two results is achieved.