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A DC Motor Speed Control by Selection of PID Parameter using Genetic Algorithm
Yoo, Heui-Han,Lee, Yun-Hyung The Korean Society of Marine Engineering 2007 한국마린엔지니어링학회지 Vol.31 No.3
The aim of this paper is to design a speed controller of a DC motor by selection of a PID parameters using genetic algorithm. The model of a DC motor is considered as a typical non-oscillatory, second-order system, And this paper compares three kinds of tuning methods of parameter for PID controller. One is the controller design by the genetic algorithm. second is the controller design by the model matching method third is the controller design by Ziegler and Nichols method. It was found that the proposed PID parameters adjustment by the genetic algorithm is better than the Ziegler & Nickels' method. And also found that the results of the method by the genetic algorithm is nearly same as the model matching method which is analytical method. The proposed method could be applied to the higher order system which is not easy to use the model matching method.
Digital PID Control based on GA and Model Matching method for the Application to a DC Motor
유희한(Heui-Han Yoo),소명옥(Myung-Ok So),이윤형(Yun-Hyung Lee),정병건(Byung-Gun Jung) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-
The aim of this paper is to design a speed controller of a DC motor by selection of a PID parameters using genetic algorithm with reference model and model matching method. The model of a DC motor is considered as a typical non-oscillatory, second-order system. And this paper compares three kind of method for the selection of PID parameters. One is the controller design by the genetic algorithm, second is the controller design by the model matching method, third is the controller design by Ziegler and Nichols method. It was found that the PID parameters adjustment by the genetic algorithm is better than the Ziegler & Nichols’ method. And also found that the results of the method by the genetic algorithm is nearly same as the model matching method which is analytical method.
Han, Man-Jung,Yoo, Kyung-Soo,Kim, Young-Heui,Kim, Hong-Youb,Shin, Hyun-Joon,Chang, Ji-Young The Polymer Society of Korea 2004 Macromolecular Research Vol.12 No.4
The polysaccharide, (1\longrightarrow5)-$\alpha$-D-ribofuranan, was synthesized by a cationic ring-opening polymerization of 1,4-anhydro-2,3-di-O-benzyl-$\alpha$-D-ribopyranose with the aid of boron trifluoride etherate and subsequent debenzylation. This polysaccharide catalyzed the hydrolysis of ethyl p-nitrophenyl phosphate, uridylyl(3'\longrightarrow5')uridine ammonium salt, and 4-tert-butylcatechol cyclic phosphate N-methyl pyridinium. The polymer also catalyzed the cleavage of nucleic acids (DNA and RNA). The hydrolysis of ethyl p-nitrophenyl phosphate in the presence of the polymer was accelerated by 1.5 ${\times}$ 10$^3$ times relative to the uncatalyzed reaction. The catalytic activity was attributable to the vic-cis-diols of the riboses being located inside the active center that is formed by polymer chain folding; these diols form hydrogen bonds with two phosphoryl oxygen atoms of the phosphates so as to activate the phosphorus atoms to be attacked by nucleophile ($H_2O$).
Inkyu Yoo,Yoon Chul Kye,Jisoo Han,Soohyung Lee,Wonchul Jung,Tae Sub Park,Cheol-Heui Yun,Hakhyun Ka 한국동물생명공학회(구 한국동물번식학회) 2018 발생공학 국제심포지엄 및 학술대회 Vol.2018 No.06
For the establishment of successful pregnancy the maternal immune system must tolerate the implanting semi-allogenic conceptus, but the mechanism underlying this process is not fully understood in pigs. Among many factors, members of the tumor necrosis factor superfamily (TNFSF) have been considered as important immune regulators in cell-mediated immunity. TNFSF members bind to their responsive receptor containing cytoplasmic death domain to induce apoptosis in immune cells. Action of TNFSF members at the during pregnancy has been studied in some species including humans, mice and cows, suggesting that the TNFSF-induced apoptosis of activated maternal immune cells at the maternal-conceptus interface may be one of the mechanisms against rejection of semi-allogenic fetus. However, the expression and function of TNFSF members at the maternal-conceptus interface have not fully understood in pigs. Thus, to initiate the study on the role of TNFSF members for the establishment of pregnancy, we determined the expression of the TNFSF members, CD40 ligand (CD40LG), FAS ligand (FASLG), TNFα and TNF-related apoptosis inducing ligand (TRAIL; TNFSF10) in the endometrium and conceptus tissues during pregnancy in pigs. Real-time RT-PCR analysis showed that CD40LG, FASLG, TNFα and TNFSF10 mRNAs were expressed in the uterine endometrium during the estrous cycle and pregnancy. Levels of CD40LG, FASLG, TNF-α and TNFSF10 mRNA in endometrial tissues significantly increased on Day 15 of pregnancy, and levels of FASLG, TNF-α and TNFSF10 were also high on Day 60 of pregnancy and decreased thereafter. Immunohistochemical analysis showed that CD40LG and TNFSF10 proteins were localized mainly to luminal epithelial (LE) cells on Day 15 of pregnancy and amniotic membrane during late pregnancy, while FASLG protein was localized to LE cells during Day 30 to term and glandular epithelial cells during the estrous cycle and pregnancy. To understand the regulatory mechanism of endometrial CD40LG, FASLG and TNFSF10 expression by conceptus-derived cytokines, we treated endometrial tissues with increasing doses of interferon-γ (IFNG) and interferon-δ (IFND) and found that IFNG increased the expression of CD40L, TNFα and TNFSF10 mRNA, but not FASLG mRNA, and IFND increased TNFSF10 mRNA. To further understand the role of TNFSF10 on apoptosis of immune cells at the maternal-conceptus interface, we measured cell death of peripheral blood mononuclear cells by uterine epithelial cells expressing TNFSF10, and found that TNFSF10-expressing epithelial cells decreased survival of immune cells, especially of myeloid lineage. These results showed that CD40LG, FASLG, TNFα and TNFSF10 were expressed in a cell-type and stage-specific fashion in the endometrium during pregnancy, suggesting that CD40LG, FASLG, TNF and TNFSF10 may play an important role in the establishment of pregnancy by regulating the maternal immune response at the maternal-conceptus interface in pigs.
만성 족관절 불안정성을 가진 환자군에서 변형 브로스트롬 술식과 봉합 테이프를 추가한 술식 간의 결과 비교
Gwak Heui-Chul,Jung Soo-Hwan,Kim Jung-Han,Park Dae-Hyun,Choo Hye-Jung,Kim Dae-Yoo 대한족부족관절학회 2022 대한족부족관절학회지 Vol.26 No.1
Purpose: The modified Broström repair (BR) technique has yielded good outcomes in patients with chronic ankle instability. This study compared clinical and radiological outcomes between two groups of patients who underwent modified BR or lateral ligament augmenta- tion using suture tapes (ST). Materials and Methods: Seventy-seven patients (ST group [n=47], BR group [n=30]; body mass index <26.61 kg/m2; mean age, 30.7±11.0 years [range, 17~39 years]; mean follow-up, 34.0±12.0 months [range, 24~59 months]) were retrospectively reviewed between January 2014 and July 2017. The Foot and Ankle Outcome Score (FAOS), American Orthopedic Foot and Ankle Score (AOFAS), Foot and Ankle Ability Measure (FAAM), visual analogue scale (VAS) score, and Sefton grading system were used for clinical assessment. The talar tilt angle and anterior talar translation were measured using the Telos stress device (Telos GmbH, Marburg, Germany) at 150 N for radiological evaluation. Results: FAOS, AOFAS, FAAM, and VAS scores improved in both groups at final follow-up (ST, 91.1±5.2, 93±2, 88.1±4.5, 1.5±0.7 vs. BR, 91.3±5.4, 93±3, 83.3±4.8, 1.2±0.7, respectively; p=0.854, 0.971, <0.001, 0.04, respectively). According to the FAOS, mean sports ac- tivity scores for the ST and BR groups at the final follow-up were 90.3±3.2 and 76.6±4.2, respectively, reflecting superior outcomes in the ST group (p<0.001). Sefton grading revealed satisfactory functional outcomes (ST, 91.5% vs. BR, 90.0%) . There was significant improve- ment in the talar tilt angle and anterior talar translation in both the ST and BR groups (7.6°±1.2°, 10.5±1.8 mm vs. 4.9°±1.1°, 7.9±1.5 mm, respectively; p<0.001). Conclusion: The ST group demonstrated comparable clinical but better improvement in mechanical stability and FAOS sports scores than the BR group.