• 제목/요약/키워드: $\mu$-Synthesis

검색결과 1,510건 처리시간 0.026초

$\mu$-synthesis 기법에 의한 중.소형 디젤기관의 속도 제어계에 관한 연구 (A study on the speed control system of medium - small size diesel engine by $\mu$-synthesis)

  • 양주호;변정환;정병건
    • Journal of Advanced Marine Engineering and Technology
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    • 제21권1호
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    • pp.82-87
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    • 1997
  • This paper presents a method about the modeling of the medium - small diesel engine for the speed control and designs the robust speed control system by the $\mu$-synthesis, which has good performance, in spite of the existence of model uncertainities and the external disturbance. We confirmed the validity of the proposed modeling method and the designed control system by $\mu$-synthesis through the experimental responses.

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Sodium fluoride와 Sodium orthovanadate가 조골세포주 MC3T3-E1에 미치는 영향에 관한 연구 (THE EFFECT OF SODIUM FLUORIDE AND SODIUM ORTHOVANADATE ON OSTEOBLASTIC CELL LINE MC3T3-E1 CELLS)

  • 김원진;정규림
    • 대한치과교정학회지
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    • 제21권1호
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    • pp.97-111
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    • 1991
  • It is the aim of this study to investigate the effects of sodium fluoride and sodium orthovanadate upon the proliferation and activity of the osteoblast (MC3T3-E1 cells). MC3T3-E1 cells were cultured in $\alpha-MEM$ containing $10\%$ FBS and various concentration of sodium fluoride and sodium orthovanadate was appended to serum free media. DNA synthesis was examined through the $[^3H]$ thymidine incorporation into DNA. Collagen synthesis was examined through the $[^3H]$ proline incorporation into collagenase digestible protein and noncollagen protein. The following results were drawn; 1. Sodium fluoride stimulated the DNA synthesis of osteoblast significantly in dose-dependent manner within the concentration from $2{\mu}M$ to $10{\mu}M$ (P < 0.005). 2. Sodium orthovanadate stimulated the DNA synthesis of osteoblast significantly in dose-dependent manner within the concentration from $2{\mu}M\;to\;8{\mu}M$, however showed diminution at $10{\mu}M$ (P < 0.001). 3. Sodium fluoride and sodium orthovanadate stimulated the percent collagen synthesis of osteoblast significantly in dose-dependent manner within the concentration from $5{\mu}M$ to $10{\mu}M$ (P < 0.001). 4. Sodium fluoride and sodium orthovanadate stimulated the noncollagen synthesis of osteoblast significantly in dose-dependent manner within the concentration from $5{\mu}M\;to\;10{\mu}M$ (P < 0.001). In conclusion, sodium fluoride and sodium orthovanadate stimulate the proliferation and activity of osteoblast by stimulation of DNA synthesis and collagen and noncollagen synthesis in osteoblast.

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최적 연료주입 모델 추종형 ${\mu}-$합성 제어기의 설계에 관한 연구 (A study of design on model following ${\mu}-$synthesis controller for optimal fuel-injection)

  • 황현준;김동완;정호성;손무헌;김영훈;황기현;문경준;박준호;황창선
    • 제어로봇시스템학회논문지
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    • 제4권2호
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    • pp.163-169
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    • 1998
  • In this paper, we design an optimal model following ${\mu}-$synthesis control system for fuel-injection of diesel engine which has robust performance and satisfactory command tracking performance in spite of uncertainties of the system. To do this, we give gain and dynamics parameters to the weighting functions and apply genetic algorithm with reference model to the optimal determination of the weighting functions that are given by the D-K iteration method which can design ${\mu}-$synthesis controller in the state space. These weighting functions are optimized simultaneously in the search domain which guarantees the robust performance of the system. The ${\mu}-$synthesis control system for fuel-injection designed by the above method has not only the robust performance but also a better command tracking performance than those of the ${\mu}-$synthesis control system designed by trial-and-error method. The effectiveness of this ${\mu}-$synthesis control system for fuel-injection is verified by computer simulation.

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혼합 H$_2$H$\infty$$\mu$-이론을 이용한 벤치마크 문제의 해법 (Mixed H$_2$H$\infty$and $\mu$-synthesis Approach to Coupled Three-Inertia Benchmark Problem)

  • 최연욱
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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    • pp.22-22
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    • 2000
  • This study investigates the use of mixed $H_2/H_{\infty}$ and $\mu$-synthesis to construct a robust controller for the benchmark problem. The model treated in the problem is a coupled three-inertia system which reflects the dynamics of mechanical vibrations. We, first adopt the mixed $H_2/H_{\infty}$ the to design a feedback controller K(s). Next, $\mu$-synthesis method is applied to the overall system to make use of structured parametric uncertainty.

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유전 알고리즘을 이용한 디젤 엔진의 최적 연료주입 모델 추종형 ${\mu}$-합성 제어 시스템의 설계 (A Design on Model Following ${\mu}$-Synthesis Control System for Optimal Fuel-Injection of Diesel Engine Using Genetic Algorithms)

  • 김동완;황현준
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1997년도 하계학술대회 논문집 B
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    • pp.587-589
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    • 1997
  • In this paper we design the model following ${\mu}$-synthesis control system for optimal fuel-injection of diesel engine using genetic algorithms. To do this, we give gain and dynamics parameters to the weighting functions and apply genetic algorithms with reference model to the optimal determination of weighting functions that are given by D-K iteration method which can design ${\mu}$-synthesis controller in the state space. These weighting functions are optimized simultaneously in the search domain selected adequately. The effectiveness of this ${\mu}$-synthesis control system for fuel-injection is verified by computer simulation.

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혼합 $H_2/H_{$\infty}$$\mu$-설계이론을 이용한 3관성 문제의 해법 (Mixed $H_2/H_{$\infty}$ and $\mu$-synthesis Approach to the Coupled Three-Inertia Problem)

  • 최연욱
    • 제어로봇시스템학회논문지
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    • 제7권11호
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    • pp.896-903
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    • 2001
  • This study investigates the use of mixed $H_2/H_{$\infty}$ and $\mu$-synthesis to construct a robust controller for the benchmark problem. The model treated in the problem is a coupled three-inertial system that reflects the dynamics of mechanical vibrations. This kind of problem requires to be satisfied the robust performance (both in the time and frequency-domain specifications). We, first, adopt the mixed $H_2/H_{$\infty}$ theory to design a feedback controller K(s). Next, $\mu$-synthesis method is applied to the overall system to make use of structured parametric uncertainty. This process permits higher levels of controller authority and reduces the conservativeness of the controller. Finally, the feedforward controller is also used to improve the transient response of the output. We confirm that all design specifications except a complementary sensitivity condition can be achieved.

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보골지(補骨脂)의 고량주(高梁酒), 소주(燒酒) 추출물이 B16 melanoma 세포주의 멜라닌 합성에 미치는 영향 (The effcect of Gorynju and a Soju extract Psoraleae fructus on Melanin synthesis of B16 melanoma cells)

  • 서형식
    • 한방안이비인후피부과학회지
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    • 제21권1호
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    • pp.96-103
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    • 2008
  • Objective : This research was carried out to compare the effect of Gorynju and a Soju extract Psoraleae fructus on melanin synthesis of B16 melanoma cells. Methods : To investigate melanin synthesis of B16 melanoma cells, this research was measured cell survival, tyrosinase activity, melanin synthesis, western blot. Results : Both Gorynju and Soju extract Psoraleae fructus, cell toxicity depended on the density. Tyrosinase activity depended on the density of Gorynju extract Psoraleae fructus and statistic was showed significant(0.5, 1, 2, 3 ${\mu}g/ml$), in a Soju extract Psoraleae fructus, 1 ${\mu}g/ml$ were showed significant. Melanin synthesis was showed significant in a Soju extract Psoraleae fructus(3, 4 ${\mu}g/ml$). Western blot was showed to depend on the density of Gorynju and a Soju extract Psoraleae fructus. Conclusions : In a tyrosinase activity and a melanin synthesis, the intermediate alcohol of Gorynju and a Soju may be suitable to use.

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Antitumor Activity of Crude Sesaminol in Sesame Seed

  • Ryu, Su-Noh;Lee, Bong-Ho
    • 한국작물학회지
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    • 제43권3호
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    • pp.168-171
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    • 1998
  • Sesaminol in sesame seed was postulated to have antitumor activity. The present study was performed to characterize the role of crude sesaminol extracted from sesame seed (Sesame Crude Sesaminol; SCS) on inhibiting the in vitro growth of human leukemia HL-60 cells. SCS inhibited the growth of human leukemia HL 60 cells in culture and macromolecular synthesis in a dose and time dependent manner. The cytostatic range of SCS concentration was found to be 60 to 100 $\mu\textrm{g}$/ml. SCS concentration greater than 200 $\mu\textrm{g}$/mlwere cytocidal to HL-60 cells. When SCS concentraction was 6 $\mu\textrm{g}$/mland 50 $\mu\textrm{g}$/ml the synthesis of HL-60 cells was inhibited by 35% for DNA, 6% for RNA and 5% for protein and 83% for DNA, 76% for RNA and 60% for protein. Of specific interest was the irreversible effect of SCS in inhibiting DNA synthesis of HL-60 cells. This was evidenced from the fact that, even after washed with PBS three times, preincubated HL-60 cells still showed the inhibited DNA synthesis.

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The μ-synthesis and analysis of water level control in steam generators

  • Salehi, Ahmad;Kazemi, Mohammad Hosein;Safarzadeh, Omid
    • Nuclear Engineering and Technology
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    • 제51권1호
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    • pp.163-169
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    • 2019
  • The robust controller synthesis and analysis of the water level process in the U-tube system generator (UTSG) is addressed in this paper. The parameter uncertainties of the steam generator (SG) are modeled as multiplicative perturbations which are normalized by designing suitable weighting functions. The relative errors of the nominal SG model with respect to the other operating power level models are employed to specify the weighting functions for normalizing the plant uncertainties. Then, a robust controller is designed based on ${\mu}$-synthesis and D-K iteration, and its stability robustness is verified over the whole range of power operations. A gain-scheduled controller with $H_{\infty}$-synthesis is also designed to compare its robustness with the proposed controller. The stability analysis is accomplished and compared with the previous QFT design. The ${\mu}$-analysis of the system shows that the proposed controller has a favorable stability robustness for the whole range of operating power conditions. The proposed controller response is simulated against the power level deviation in start-up and shutdown stages and compared with the other concerning controllers.

Calcium-Boron Interaction in Exopolysaccharide Production by the Cyanobacterium, Nostoc spongiaeforme

  • Singh;Netu;Asthana, R.K.;Singh, S.P.
    • Journal of Microbiology and Biotechnology
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    • 제10권3호
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    • pp.381-385
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    • 2000
  • The effect and interaction of Ca and B on exopolysaccharide (EPS) synthesis in the diazotrophically growing cyanobacterium. Nostoc spongiaeforme, was investigated. The absence of B inhibited EPS synthesis 1.56-fold ($16\mu\textrm{g}$ glucose equivalent/mg dry weight, 16 d) over the control cells ($25\mu\textrm{g}$ glucose equivalent) grown in medium containing 0.5 mM Ca and $8{\mu}{\textrm}{m}$ B. When B concentration was raised to $40{\mu}{\textrm}{m}$, EPS production was stimulated 1.8-fold. Reduction of Ca concentraion to one-half (0.25 mM) resulted in increased B demand (16$\muM$) by the cells for EPS production at par with the normal sets. However, without Ca, EPS production also increased as B increased. Addition of B to a Ca-free medium stimulated cyanobacterial diazotrophic growth as well as synthesis of Chl a and phycocyanin (0-8 d). The data suggest B-dependent diazotrophic growth during Ca-deficiency and point to and important interactive role of Ca and B in regulation of cyanobacterial EPS synthesis.

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