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보통형 콤바인 부착용 유채 예취장치 개발(II) - 유채 수확 적응성 평가 -
이충근,최용,장영석,정용수,이승규,이왕돈,Lee, Choung-Keun,Choi, Yong,Jang, Young-Seok,Jung, Young-Su,Lee, Seung-Kyu,Lee, Wang-Don 한국농업기계학회 2009 바이오시스템공학 Vol.34 No.1
A rapeseed reaping equipment attachable to a conventional combine was developed in order to harvest rapeseed for bio-diesel materials. This study was carried out to measure the harvest feasibility of a prototype combine in rapeseed fields. Grain, stem and pod flow rate, grain qualities (whole kernel, damaged kernel, unhulled kernel, material-other-than-grain) and grain loss rates (header, threshing, separation) were investigated in each field test. As the result of the fold test, the average grain flow rates of SUNMANG and MS varieties showed 1,430 kg/h and 2,038 kg/h, respectively. The average stem and pod flow rates showed 3,443 kg/h and 6,596 kg/h, respectively. In each working speed, the average whole kernel rate and the material-other-than-grain showed 99.9% and below 0.08%, respectively. In the average grain loss, the rates showed 5.66% in case of SUNMANG and 5.94% in MS. Header loss was higher than other parts for SUNMANG. However, threshing loss was relatively higher than other parts for MS. Header loss rate due to side cutter knifes, however, was not so high when compared with a grain loss due to the cutter bar. Effective field capacity and field efficiency of the prototype combine showed 0.389 ha/h and 44%, respectively. Comparison of customary combine with the prototype combine through field test demonstrated that the header loss was reduced by 69.3% when the prototype combine was used.
보통형 콤바인 부착용 유채 예취장치 개발 (III) - 유채 기계 수확 손실 절감을 위한 요인 구명 -
이충근,최용,전현종,이승규,문성동,김송수,Lee, C.K.,Choi, Y.,Jun, H.J.,Lee, S.K.,Moon, S.D.,Kim, S.S. 한국농업기계학회 2009 바이오시스템공학 Vol.34 No.2
Field test was conducted to investigate primary factors reducing rapeseed harvesting using a reciprocating cutter-bar of combine. The results showed that the correlation between crop moisture content and yield loss had a U-type, which indicated that the yield reduction increased at too high and too low crop moisture contents. The proper ranges of crop moisture contents were 27${\sim}$35%, 21${\sim}$56%, and 62${\sim}$73% in case of grain, pod and stem, respectively. Crop moisture content was negatively correlated with header loss, but positively correlated with threshing loss. In contrary, stem moisture content showed positive correlations with total loss, threshing loss and separation loss. Working speed was positively correlated with header loss. Total flow rate, pod flow rate and stem flow rate were highly correlated with threshing loss and separation loss. However, grain flow rate did not show any correlation with total loss. According to the principal component analysis, two principal components were derived as components with eigenvalues greater than 1.0. The contribution rates of the first and the second components were 52.7% and 38.9%, which accounted for 91.6% of total variance. As a contributive factor influencing total loss of rapeseed mechanical harvesting, a crop moisture content factor was greater than a crop flow rate factor. The stepwise multiple regression analysis for total loss was conducted using crop moisture content factor, crop flow rate factor and coefficient. However, the model did not show any correlation among independent and dependent factors ($R^2$=0.060).
NMOS 소자에 대한 Ru<sub>1</sub>Zr<sub>1</sub> 합금 게이트 전극의 특성
이충근,강영섭,홍신남,Lee, Chung-Keun,Kang, Young-Sub,Hong, Shin-Nam 한국전기전자재료학회 2004 전기전자재료학회논문지 Vol.17 No.6
This paper describes the characteristics of Ru-Zr alloy gate electrodes deposited by co-sputtering. The various atomic composition was made possible by controlling sputtering power of Ru and Zr. Thermal stability was examined through 600 and 700 $^{\circ}C$ RTA annealing. Variation of oxide thickness and X-ray diffraction(XRD) pattern after annealing were employed to determine the reaction at interface. Low and relatively stable sheet resistances were observed for Ru-Zr alloy after annealing. Electrical properties of alloy film were measured from MOS capacitor and specific atomic composition of Zr and Ru was found to yield compatible work function for nMOS. Ru-Zr alloy was stable up to $700^{\circ}C$ while maintaining appropriate work function and oxide thickness.
이충근,이명호,Lee, Chung-Geun,Lee, Myeong-Ho 한국전자통신연구원 1985 전자통신 Vol.7 No.2
본 고는 교환기에서 방출되는 전계 및 자계의 허용 규제치와 외부에서 들어오는 전계 및 자계에 대해 교환기가 얼마나 정상적인 동작을 할 수 있는가를 규정하고 있는 피방해 감도(EMC), 교환기에 의한 EMI 및 주변장치에서 발생하는 전자계의 규제에 대해 서술하고 이에 따른 측정 방법을 제시한다.
이충근,신항식,공인덕,이명호,Lee, Chung-Keun,Shin, Hang-Sik,Kong, In-Deok,Lee, Myoun-Ho 대한의용생체공학회 2011 의공학회지 Vol.32 No.2
Assuming that photons absorbed by a vessel do not have acute variations, DC component reflect the basal blood volume (or diameter) before blood pulsation. Vascular stiffness and reflection is influenced by changes in basal blood volume (or diameter). This paper describes analysis of the characteristic variations of vascular stiffness, according to relative variations in DC components of the PPG signal (25-75%). For quantitative analysis, we have used parameters that were proposed previously, reflection and stiffness index, and the second derivative of PPG waveform, b/a and d/a. Significantly, the vascular stiffness and reflections were increased according to increase in DC component of the PPG signal for more than about 3% of baseline values. The systolic blood pressure were increased from $113.1{\times}13.18$ to $116.2{\times}13.319$ mmHg, about 2.76% (r = 0.991, P < 0.001) and the AC component of the PPG signal were decreased from $2.073{\times}2.287$ to $1.973{\times}2.2038$ arbitrary unit, about 5.09% (r = -0.993, P < 0.001). It is separated by DC median and correlation analysis was performed for analyzing vascular characteristics according to instantaneous DC variations. There are significant differences between two correlation coefficients in separated data.