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이영문,장승일,손정우,윤종훈,Lee, Young-Moon,Chang, Seung-Il,Sun, Jeong-Woo,Yun, Jong-Hoon 한국기계가공학회 2004 한국기계가공학회지 Vol.3 No.2
Machinability in metal cutting processes depends on cutting input conditions such as cutting velocity, feed rate, depth of cut, types of work material and tool shape factors. In this study, to assess chip breaking characteristics of a turning process, an equivalent oblique cutting system to this has been established. And the equivalent effective rake angle was determined using side rake angle, back rake angle and side cutting edge angle of the tool. A non-dimensional parameter, Chip breaking index(CB), was used to assess Chip breaking characteristics of chip in conjunction with the equivalent effective rake angle. In case of positive rake angles of the equivalent effective rake, the back rake angle has little effect on the chip breaking characteristics however, in case of negative ones, the side rake angle has some effect on Chip breaking characteristics.
추정평면에서 평가한 데이터와 인공신경망에 의한 숫자음 인식
최일홍,장승관,차태호,최웅세,김창석,Choi, Il-Hong,Jang, Seung-Kwan,Cha, Tae-Hoo,Choi, Ung-Se,Kim, Chang-Seok 한국음향학회 1996 韓國音響學會誌 Vol.15 No.4
본 논문은 추정평면의 데이터로부터 특징파라미터의 평가와 인공신경망에 의한 음성인식방법을 제안한다. 각 프레임에서 평가한 LPC는 매핑함수를 이용하여 추정평면으로 매핑시켰으며, 본 논문에서는 이 추정평면의 데이터로부터 C-LPC, 최대값, 최소값, 3등분할 파워 특징값을 평가하였다. 추정평면에서 평가한 특징 파라미터는 인공신경망에 입력한 음성인식 실험으로부터 원 음성신호의 시간변화에 따른 특징을 포함하고 있음을 확인하였고, 제안한 방법에 의한 인식으로부터 인식율이 약 96.3%이었다. This paper was proposed the recognition method by using parameters which was estimated from the data on the estimated plane and a neural network. After the LPC estimated in each frame algorithm was mapped to the estimated plane by the optimum feature mapping function, we estimated the C-LPC and the maximum and minimum value and 3 divided power from the mapping data on the estimated plane. As a result of the experiment of the speech recognition that those parameters were applied to the input of a neural network, it was found that those parameters estimated from the estimated plane have the features of the original speech for a change in the time scale and that the recongnition rate by the proposed methods was 96.3 percent.
오후규(Hoo-Kyu Oh),전민주(Min-Ju Jeon),유태근(Tae-Guen Yu),장승일(Seung-Il Jang),손창효(Chang-Hyo Son) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-
The heat transfer of CO₂ has a greater effect on nucleate boiling more than convective boiling. Mass flux of CO₂ does not effect nucleate boiling too much. In comparison with test results and existing correlations, it is necessary to develop reliable and accurate predictions determining the evaporative heat transfer coefficient of CO₂ in a horizontal tube.
단구간에너지와 변곡점 평가에 의한 음성의 천이구간 특징추출
최일홍,장승관,김창석 명지대학교 대학원 1997 대학원논문집 Vol.1 No.-
This paper proposed a discriminating method by estimating the turning points and the average magnitude energy in speech signal. This method solved a problem of zero-crossing rate. Transient samples before signal does not reach steady state from the beginning point are discriminated and also features of transient data are estimated by this method. As results that carried out with speech signals, it was found that even through speech samples included in D.C level, the beginning and end point of the speech signals was exactly discriminated by this method, a length of transient period and a short time energy and frequency features were extracted from transient samples and these parameters were compared to each spoken words.