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Hybrid Fuzzy Learning Controller for an Unstable Nonlinear System
Chung, Byeong-Mook,Lee, Jae-Won,Joo, Hae-Ho,Lim, Yoon-Kyu Korean Society for Precision Engineering 2000 International Journal of Precision Engineering and Vol.1 No.1
Although it is well known that fuzzy learning controller is powerful for nonlinear systems, it is very difficult to apply a learning method if they are unstable. An unstable system diverges for impulse input. This divergence makes it difficult to learn the rules unless we can find the initial rules to make the system table prior to learning. Therefore, we introduced LQR(Linear Quadratic Regulator) technique to stabilize the system. It is a state feedback control to move unstable poles of a linear system to stable ones. But, if the system is nonlinear or complicated to get a liner model, we cannot expect good results with only LQR. In this paper, we propose that the LQR law is derived from a roughly approximated linear model, and next the fuzzy controller is tuned by the adaptive on-line learning with the real nonlinear plant. This hybrid controller of LQR and fuzzy learning was superior to the LQR of a linearized model in unstable nonlinear systems.
Growth and Properties of Sb-doped ZnMgO Thin Films Deposited Using rf Magnetron Sputtering
Sung Mook Chung,Jae Heon Shin,Min Ki Ryu,Chi-Sun Hwang,Hye Yong Chu,Kyoung Ik Cho 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.3
We report on the growth and the properties of Sb-doped ZnMgO thin films deposited using radiofrequency (rf) magnetron sputtering for applications as transparent thin film transistors (TFTs) with p-type channels. The target was prepared with high-purity MgO mixed with ZnO and Sb2O5 as doping agents. Thin films were heat-treated in vacuum, oxygen, and nitrogen atmospheres. The effects of the working gas (Ar/O2) ratios and the annealing conditions on the structural and the electrical properties were investigated. The atomic ratio of Zn/Mg in the films, and accordingly the films properties, depended on the post-annealing conditions and on the oxygen partial pressure in the working gas during sputtering. We report on the growth and the properties of Sb-doped ZnMgO thin films deposited using radiofrequency (rf) magnetron sputtering for applications as transparent thin film transistors (TFTs) with p-type channels. The target was prepared with high-purity MgO mixed with ZnO and Sb2O5 as doping agents. Thin films were heat-treated in vacuum, oxygen, and nitrogen atmospheres. The effects of the working gas (Ar/O2) ratios and the annealing conditions on the structural and the electrical properties were investigated. The atomic ratio of Zn/Mg in the films, and accordingly the films properties, depended on the post-annealing conditions and on the oxygen partial pressure in the working gas during sputtering.
박재호 ( Jae-ho Park ),정지은 ( Jieun Chung ),강혜정 ( Hye Jeong Kang ),오하경 ( Ha Kyung Oh ),이경희 ( Kyeong Hee Lee ),김영호 ( Youngho Kim ),윤건묵 ( Gun-mook Yoon ),엄현주 ( Hyun-ju Eom ) 한국식품영양학회 2017 韓國食品營養學會誌 Vol.30 No.4
This study investigated the nutritional compositions and physiochemical properties of three domestically cultivated jujube fruits (Boeun, Sangwhang, and Bokjo). Nutrient contents were analyzed by freeze-drying the jujube fruits. The results showed that the proximate compositions of the three jujube cultivars ranged from 7.85~13.52% for moisture, 4.65~5.24% for crude protein, 1.29~2.38% for crude ash, 0.17~1.09% for crude lipid, and 7.66~16.63% for crude fiber. The above proximate contents of jujube cultivars were significantly different. Mineral contents of Al, Fe, Mg, Ca, Na, and K in the three jujube fruits were also determined. Mn, Cu and Zn were not detected in any of the varieties. The content of Al was higher in Sangwhang, while Boeun had higher contents of Ca and K. The total polyphenol, ABTS values, and hypoglycemic effect were slightly higher in Boeun as compared to the other varieties. Taken together, Boeun could be an important source of natural antioxidant as a functional food.
충청지방의 A 형 간염 바이러스 항체에 관한 역학적 조사
이재익(Jae Ik Lee),김진용(Jin Yong Kim),김승태(Seung Tae Kim),윤성열(Sung Yeul Yoo),정선묵(Sun Mook Chung),김영건(Young Kun Kim),이복희(Bok Hee Lee) 대한소화기학회 1982 대한소화기학회지 Vol.14 No.2
N/A Anti-HA was examincd in a total of 543 cases by radioimmunoassay techniqne, including 358 pediatric patients, and 185 healthy adults without history of liver disease. The results obtained are as follows In child group, the positive rate of Anti-HA was 97.8% uncer 1month old, and tend to be decreased with a e. The nositive rate of Anti-HA;:as C, in 8 to 0 r,-o..ths old,;:r.d then the positive rare wae slowly increased with age. After 9 years old, the rate was increased rapidly 68.8% in 9-10 years, 81.2% in 11 2 years and 84.6% in 13-15 years. In adult group, the positive rate of Anti-HA was 94.6%, in 16-20 years old, 93.0%% 21-30 years, 97.2% in 88.2% 41-50 years, 93.8% in 51-60 years and 88.2% in 61-80 years.