• Title/Summary/Keyword: 가제어지수

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Optimal Active Seismic Control of Structures with Optimum Location of Active Controllers (제어기의 최적위치선정을 고려한 구조물의 최적 능동지진제어)

  • Cho, Chang-Geun;Kwon, Joon-Myoung;Park, Tae-Hoon;Park, Moon-Ho
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.12 no.5
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    • pp.179-189
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    • 2008
  • The object of this study is to develope a program with proposed numerical techniques for an optimal seismic control of structures using active tendon systems. Ricatti closed-loop algorithm has been applied to control the active tendon systems with time-delay problem. The optimal control is formulated as an optimization problem which is finding optimal weighting matrices by minimizing the quadratic performance index by SUMT. In order to find the optimal location of active tendons in structures, controllability index has been introduced. From numerical examples, the current optimal control technique with optimal location of tendons was suitable to control the seismic response of structures.

Effects of Supplemental Herb Medicines in the Diets on Growth, Feed Utilization and Body Composition of Juvenile and Grower Rockfish Sebastes schlegeli (배합사료에 생약재 첨가가 조피볼락 치어 및 육성어의 성장, 사료 이용성 및 체조성에 미치는 효과)

  • Seo, Joo-Young;Kim, Kyoung-Duck;Lee, Sang-Min
    • Journal of Aquaculture
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    • v.22 no.1
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    • pp.112-117
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    • 2009
  • This study were conducted to investigate the effects of several additives in experimental diets on the growth, feed utilization and body composition of juvenile and grower rockfish. Three replicates of juveniles (3.6 g/fish) and two replicates growers (166 g/fish) were fed the experimental diets containing herb medicines mixture, Artemisia asiatica and Epimedium koreanum for 8 weeks. Dietary supplementation with herb medicines mixture had no beneficial effects on growth and feed utilization of juvenile fish. Weight gain, daily feed intake, condition factor and hepatosomatic index of grower fish fed the diet were not affected by dietary additive (P>0.05). Peed efficiency and protein efficiency ratio of grower fish fed the diet containing herb medicines mixture were significantly higher than those of fish fed the control diet (P<0.05), but not significantly different from fish fed the diet containing A. asiatica and E. koreanum (P>0.05). Proximate analysis of whole body, muscle, viscera and liver in the juvenile and grower were not affected by dietary additives (P>0.05). The results of this study suggest that feed efficiency and protein efficiency ratio of grower rockfish may improved by herb medicines mixture supplementation in the diet.