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Synchronous Position Controller Design of Hydraulic Cylinders for a Sluice Gate Using Fuzzy PI
최병재,Choi, Byung-Jae Korea Information Electronic Communication Technol 2014 한국정보전자통신기술학회논문지 Vol.7 No.3
In general a main technology of control a sluice gate is accurate synchronous position control for the two cylinders when they are moving with the sluice gate together over 10[m]. Because the nonlinear friction and the unconstant supply flow. Cylinders' displacement will be different. In this case the sluice gate may be deformed and abraded, and even the sluice gate may unable to work. In order to design the controller for this system, we designed two kinds of Fuzzy PI controllers. Fuzzy PI position controller and Fuzzy PI synchronous controller have been designed. We show some simulation results for its availability.
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Formocresol,Glutaraldehyde의 접촉시간에 따른 성견치수의 병리조직학적 연구
최병재 大韓小兒齒科學會 1987 大韓小兒齒科學會誌 Vol.14 No.1
The purpose of this study is to observe the histopathological changes of the pulp tissue after vital pulpotomy with formocresol or glutaraldehyde at the different time intervals of application. Upper and lower teeth in seven dogs, aged about 1 years, were subjected to pulp amputations and were divided into two groups, one of which ws pulpotomized with formocresol, the other was with glutaraldehyde. The application was performed at the intervals of 1 minute, 3 minutes, 5 minutes, 3 days and 7 days, and then the experimental animals were sacrificed 2 months after the last experiment. THe excised jaw bones were fixed in 10% neutral buffered formalin solutions, and they were routinely decalcified in 5% nitric acid, and embedded in paraffin, and sections were stained with hematoxylin and eosin and observed with light microscope. Following results were obtained. 1. In the formocresol 1 minute-, 3 minute-, 3 day- and 7 day- groups and the glutaraldehyde 1 minute-, 3 day- and 7 day- groups, the pulp tissue responses varied from normal pulp tissue findings to total coagulation necrosis. 2. In the formocresol 5 minute- group and the glutaraldehyde 3 minute- and 5 minute- groups, they showed slight inflammation and the almost typical morphology of normal pulp tissue. 3. In the almost formocresol and glutaradehyde groups, reparative dentin was formed. 4. Dentinal resorption in the formocresol group was more frequent than that in the glutaraldehyde group.
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