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적응가변구조 방법을 이용한 DC MOTOR 제어에 관한 연구
하재해,한창훈,조용갑,최부귀 동아대학교 공과대학 부설 한국자원개발연구소 1994 硏究報告 Vol.18 No.1
Direct methods and indirect methods for the adaptive control of linear plant, DC motor, are currently well known. Recently, methods for combining direct and indirect methods have also been suggested. In this note the latter method is combined with the variable structure method. New adaptive laws are suggested which overcome the principal draw-backs of the variable structure method. While the direct and indirect components of the new method assure stability, the variable structure component improves the transient response of the system. Simulation results are presented to show that the overall system is asymptotically stable in the ideal case, and exhibits robustness and improved performance in the presence of perturbations.
1999년에 발생한 기상재해 유형별 벼 수량반응조사 연구
주영철,임갑준,한상욱,박중수,조영철,김순재 한국농림기상학회 2000 한국농림기상학회지 Vol.2 No.1
The objectives of this study were to investigate weather conditions which induced discolored grains and viviparous germination, and to evaluate yield responses following viviparous germination during mid- and late- ripening stage, the submergence during reproductive growth stage, and lodging in the yellow ripe stage. Weather conditions which caused glume discoloration at heading stage were 21.3-26.4℃ in average temperature, 75.2-98.4% in relative humidity, 19.3 in transpiration coefficient and 10.8-13.8 m/sec. in wind speed. Yield reduction was 26-27% and 10∼17%, respectively, when the glume discoloration rates were 63.2-65.7% and 38.3-45.2%, obviously due to the decrease in percent of fertile grain and ripening ratio. Weather conditions during continuous rain for 7 days were 96% in relative humidity, 18.9℃ in average temperature, 21.9℃ in maximum temperature, and 16.8℃ in minimum temperature, causing the most viviparous germination in Juanbyeo(45.5%), followed by Jinbubyeo(14.5%), Bongkwangbyeo(14.2%), and Obongbyeo(12.6%). Lateral tillers started to occur when the submergence at the depth of 1.5-2 m lasted one day during the reproductive growth stage. The submergence for 2-3 days at 3-4 m of water depth induced 269-571 lateral tillers/㎡, supporting 32-52% of the total yield. The rice yield in the paddy fields which were left under the lodging conditions until harvesting was not different compared to that of the paddy fields which were kept upright by tieing them together after lodging, but perfect grain ratio decreased about 9.1% in the transplanting culture and 12.5% in the direct seeding culture on dry paddy field because of the increase in immature grains.
연구논문 : 미국인의 김치와 김치이용음식에 대한 인식과 기호도 -Illinois주와 California주-
한재숙 ( Jae Sook Han ),한경필 ( Gyeong Phil Han ),이진식 ( Jin Shik Lee ),한갑조 ( Gab Jo Han ),김영진 ( Young Jin Kim ) 한국식생활문화학회 2010 韓國食生活文化學會誌 Vol.25 No.5
The purpose of this study was to investigate American`s perception and preference for Korean kimchi. A questionnaire was used to examine the perceptions of 126 males (40.4%) and 186 females (59.6%) residing in Illinois and California. Approximately 68% of the respondents had eaten Korean food. The perception of kimchi was the highest with a mean of 3.62. The respondents felt that the "Kimchi is a good side dish with cooked rice", "Kimchi (with garlic) prevents SARS", which was significantly different (M=3.06, p< .001), and "Kimchi prevents adult diseases" (M=3.24, p< .01). When evaluating the different kinds of kimchi, onion juice kimchi had the most preferred taste and also the highest overall acceptability (M=5.50, p< .05) of the second days. In the sensory evaluation by kimchi use, the best taste (p< .001) was in the order of kimchi pizza (M=6.58), kimchi dumplings (M=6.40), and kimchi chicken a`laking (M=6.33). The order for overall acceptability (p< .001) was kimchi dumplings (M=6.30), kimchi pizza (M=6.25), kimchi bacon roll, kimchi fried rice, and kimchi chicken a`laking (M=6.17).
한재숙(Jae-Sook Han),한경필(Gyeong-Phil Han),한갑조(Gab-Jo Han),김영진(Young-Jin Kim) 동아시아식생활학회 2007 동아시아식생활학회지 Vol.17 No.6
The purpose of this study was to investigate the perception and preference for Korean Kimchi in Singapore. A questionnaire was answered by both male 236(43.0%) and female 313(57.0%) college students residing in Singapore. The results were as follows : the nationality of Kimchi as Korean was given by 86.9% of the participants, and 48.7% had eaten Kimchi. For their perceptions on Kimchi, the highest answer at a mean of 3.95 was ‘Kimchi is a good side dish with cooked rice’. It was significantly different than ‘Kimchi is delicious’(M=3.14, p<.05). In the evaluation of different kinds of Kimchi, taste was highest for anchovy dachi Kimchi(M=5.50) on the fourth day of fermentations, and overall acceptability was also highest for the anchovy dachi Kimchi(M=6.18) on the fourth day(p<.001). In the sensory evaluation by Kimchi use, the best taste was in the order of Kimchi Salad(M=6.10), Kimchi Bacon Roll(M=6.00) and Kimchi Croquette(M=5.67), and the order for overall acceptability was Kimchi Salad(M=6.10), Kimchi Bacon Roll(M=6.00) and Kimchi Croquette(M=5.92).
감귤나무에 대한 장기간 N, P, K 시비가 과실 품질 및 수량에 미치는 영향
한승갑(Seung-Gab Han),임한철(Han-Cheol Lim),좌재호(Jae-Ho Joa),문경환(Kyung-Hwan Moon),강태우(Tae-Woo Kang),송성준(Sung-Jun Song) 한국원예학회 2008 원예과학기술지 Vol.26 No.3
This study was conducted to investigate the effects of the long-term applications of N, P and K fertilizers on fruit quality and yield of 17-year-old satsuma mandarin (Citrus unshiu Marc. cv. Okitsuwase) from 1994 to 2004. The experiment plots were arranged by the randomized block design with 3 replications. Treatments of N, P and K fertilizers on satsuma mandarin were no-fertilizer (NF, 0-0-0 ㎏ㆍ㏊?¹), no-nitrogen (NN, 0-400-280 ㎏ㆍ㏊?¹), no-phosphorus (NP, 280-0-280 ㎏ㆍ㏊?¹), no-potassium (NK, 280-400-0 ㎏ㆍ㏊?¹), control (C, 280-400-280 ㎏ㆍ㏊?¹) and three times of control (3C, 840-1200-840 ㎏ㆍ㏊?¹). Fruit yield and characteristics were investigated every year. Fruit yields in NK, NN and NP treatments were lower than that of control, but those in NK and 3C were not different with control. Sugar contents measured during 6 years ranged from 9.6 to 9.8 °Bx in C, NN, NP and 3C treatments, but that in NK tended to be higher as 10.4 °Bx. Average acid contents ranged from 1.30 to 1.35% in C, NN, NP and 3C treatments, but 1.16% in NK. Decreasing application of potassium fertilizer decreased large size ratio of fruit and inversely increased medium size, while nitrogen and phosphorous fertilizer did not. In 3C, the color index (‘a’ value) of peel was the lowest, meaning that maturation of fruit is retarded; also thickness of peel and endocarp was the thickest. In conclusion, potassium fertilizer seems to be significantly related to yield and quality for citrus fruit. Hence, further studies are required to seek the optimal range of potassium levels in soil and plant tissues to increase productivity and to elevate the ratio of marketable fruit.
( Kyu-hyun Han ),( Jong-min Park ),( Migyeong Jeong ),( Young-min Han ),( Eun-jin Go ),( Juyeon Park ),( Hocheol Kim ),( Jae Gab Han ),( Oran Kwon ),( Ki Baik Hahm ) 대한간학회 2017 Gut and Liver Vol.11 No.5
Background/Aims: In inflammatory bowel disease (IBD), repeated bouts of remission and relapse occur in patients and can impose a risk of colitis-associated cancer. We hy-pothesized that plant extracts of Atractylodes macrocephala (AM) or Taraxacum herba (TH) may be better than sulfasala-zine for treating this disease because these extracts can promote additional regeneration. Methods: Murine intestinal epithelial IEC-6 cells were pretreated with AM or TH before a lipopolysaccharide (LPS)-induced challenge. Acute colitis was induced with 7 days of dextran sulfate sodium (DSS) in male C57BL/6 mice, and extracts of AM and TH were admin-istered for 2 weeks before DSS administration. Results: In vitro studies demonstrated that AM or TH treatment reduced LPS-induced COX-2 and tumor necrosis factor-α mRNA levels but increased heme oxygenase-1 (HO-1). Oral preadministra-tion of AM and TH rescued mice from DSS-induced colitis by inhibiting inflammatory mediators via inactivated extracel-lular signal regulated kinase and repressed nuclear factor κB and signal transducer and activator of transcription 3, but the effect was weaker for sulfasalazine than that for the extracts. Anti-inflammatory activities occurred via the inhibi-tion of macrophage and T lymphocyte infiltrations. Unlike sul-fasalazine, which did not induce HO-1, TH extracts afforded significant HO-1 induction. Conclusions: Because the AM or TH extracts were far superior in preventing DSS-induced colitis than sulfasalazine, AM or TH extracts can be consid-ered natural agents that can prevent IBD relapse. (Gut Liver 2017;11:655-666)