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- 저자 : 이호일(Ho-Il Lee) (검색결과 194 건)
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유한요소 해석을 이용한 3상 유도전동기의 효율 불확도 평가
이호현(Ho-Hyun Lee),박한석(Han-Seok Park),전희득(Hee-Deuk Jun),우경일(Kyung-Il Woo) 대한전기학회 2017 전기학회논문지 P Vol.66 No.4
This paper presented an evaluation method for the efficiency uncertainty of a three-phase induction motor using finite element analysis. The motor efficiency in the finite element analysis is calculated by the loss separation method as in the actual test. In the process of evaluating the efficiency uncertainty, the difference between the finite element analysis and the actual test is the method of calculating the type-A / B standard uncertainty of the input quantity to estimate the efficiency and each losses. For the input quantities which can confirm the instantaneous values with respect to time, the type-A standard uncertainty in the finite element analysis is calculated from the RMS values or average values having separate periods in the steady state. And, the type-B standard uncertainty in the finite element analysis is assumed to be zero. Also, this paper compared and analyzed the efficiency uncertainty evaluated by the proposed method and the efficiency uncertainty through the actual test.
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Hetero 발효 유산균주 첨가가 사일리지용 이탈리안 라이그라스와 총체보리의 품질에 미치는 효과
이호일,최연재,로벨리아 마무아드,김은중,오영균,박근규,이상석,Lee, Ho Il,Choi, Yeon Jae,Mamuad, Lovelia,Kim, Eun Joong,Oh, Young Kyoon,Park, Keun Kyu,Lee, Sang Suk 한국초지조사료학회 2014 한국초지조사료학회지 Vol.34 No.4
This study was conducted to determine the quality of italian ryegrass (IRG) and whole- crop barley (WCB) silage combined with heterofermentative lactic acid bacteria (LAB) during fermentation. Six strains of LAB (L. plantarum IMAU 70164, L. acidophilus KACC 12419, L. casei KACC 12413, L. reuteri KCTC 3594, L. buchneri KACC 12416 and L. diolivorans KACC 12385) were used in this study. L. casei and L. reuteri had the highest propionic acid production and were therefore used for fermenting the forages. The forages were fermented using monoculture and co-culture of L. casei and L. reuteri for 30, 45 and 60 days of ensiling. Addition of LAB lowered the pH of the IRG silage (p<0.05). Moisture content, lactic acid and acetic acid contents were higher (p<0.05) after addition of LAB. Water soluble carbohydrate was significantly lower (p<0.05) in WCB with a co-culture containing L. casei and L. reuteri. Propionic acid production was comparatively higher after addition of LAB to WCB on days 30, 45 and 60 while butyric acid was only detected in the IRG control on day 60. Fungi was not detected within 60 days after addition of LAB in IRG and WCB. Through this experiment, improved forage preservation was achieved using a co-culture containing L. casei and L. reuteri. WCB silage had higher propionic acid concentration and thus, it was a better forage for ensiling using co-culture of L. casei and L. reuteri.
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고랭지 농업지역의 경지면적 산출을 위한 지상라이다 데이터와 지적성과의 실험적 비교 분석
이호현,이정일,오민균,이경도,Lee, Ho-Hyun,Lee, Jung-Il,Oh, Min-Kyun,Lee, Kyung-Do 한국국토정보공사 공간정보연구원 2016 지적과 국토정보 Vol.46 No.2
The price of agricultural products has changed from year to year, the m ajor c ause o f price fluctuation is the imbalance of supply and demand. Materials which are mainly used in korean cabbage production volume is the forecast model, using the cadastral result, slope calculation is impossible to achieved. For this reason, this implies the drastic decrease of prices and the prediction of supply and demand of field crops that is cultivated in a highland slope area, this situation is being repeated. Therefore, the target area of this research is the slopes of high land, by using 2D and 3D Lidar data for the analysis of the cultivated area. Experiment was carried out in the same area to compare the data differences. The rate of change in the area of slope is quantitatively increasing presented by the regression model. An alternative methodology that can improve the reliability of the calculated slope area using 2D is through cadastral map.
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