• 제목/요약/키워드: tray

검색결과 580건 처리시간 0.036초

일장조건이 양파 plug 묘의 생육에 미치는 영향 (Effect of different daylength on the growth of plug seedling in onion)

  • 서전규
    • 한국생물환경조절학회:학술대회논문집
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    • 한국생물환경조절학회 2003년도 춘계 학술대회 논문집
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    • pp.128-131
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    • 2003
  • 양파는 묘의 소질에 따라 품질 및 수량에 미치는 영향이 매우 큰 작물로서 정식시묘의 크기가 클수록 수량이 증가하나 지나치게 크면 추대나 분구의 발생이 많아지므로 상품수량이 오히려 적어진다(서와 이, 1987, 하 등, 1998). 그러나 plug tray에 육묘한 묘는 용적이 적은 cell에 장기간 육묘되기 때문에 근권의 제한을 받아 관행의 토양육묘에 비해 묘의 생육이 저조할 뿐 아니라 연약 도장하여 기계정식에 장애를 초래하고 있다(정목, 1993). (중략)

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Nonlinear Model Based Control of Two-Product Reactive Distillation Column

  • Lee, In-Beum;Han, Myung-Wan
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2001년도 ICCAS
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    • pp.50.3-50
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    • 2001
  • Nonlinear feedback control scheme for reactive distillation column has been proposed. The proposed control scheme is derived in the framework of Nonlinear Internal Model Control. The product compositions and liquid and vapor flow rates in sections of the reactive distillation column are estimated from selected tray temperature measurements by an observer. The control scheme is applied to example reactive distillation column in which two products are produced in a single column and the reversible reaction A + B = C + D occurs. The relative volatilities are favorable for reactive distillation so that the reactants are intermediated boilers between the light product C and the heavy product D. Ideal physical properties, kinetics and ...

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증류탑에의 최적제어 응용연구 (Application of optimal control to a distillation column)

  • 장홍래;박현수;서인석
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1986년도 한국자동제어학술회의논문집; 한국과학기술대학, 충남; 17-18 Oct. 1986
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    • pp.209-211
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    • 1986
  • The continuous time linear quadratic problem (LQP) has been applied to the control of a 8-tray distillation column using the code VASP. The weighting matrices for the state variables and control variables were adjusted iteratively. The simulation results of the optimal control with 2 inputs and 2 outputs showed that the LQP method is very satisfactory for a rapid response and feedback control, and any desired response could be obtained by adjusting the weighting matrices Q under = and R under =. The feedback gain matrix K under = was also determined.

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Rigorous dynamics model of distillation columns

  • Choe, Young-Soon
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1986년도 한국자동제어학술회의논문집; 한국과학기술대학, 충남; 17-18 Oct. 1986
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    • pp.212-215
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    • 1986
  • For distillation columns, dynamic models which consider variable pressure and vapor holdup were studied. A most rigorous model which used the vapor hydraulic equation was studied with implicit methods. Vapor holdup must be considered in high pressure columns in order to predict dynamic responses accurately. The effect of pressure changes on the tray was only important for the vacuum column, particularly when heat input disturbances occurred. The rigorous vapor hydraulic model was shown to be useful, despite the fact that it is extremely stiff, provided an implicit integration algorithm (LSODES) is employed.

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교정용 브라켓의 간접 접착법

  • 차봉근
    • 대한치과의사협회지
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    • 제37권7호통권362호
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    • pp.530-535
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    • 1999
  • Detailed finishing of the occlusion is a clinical skill that has become difficult with the development of fixed appliances. Accuracy of bracket placement definitely improves with indirect technique, Several methods for the placement of orthodontic brackets on dental casts are currently used in the indirect bonding technique. These include attachment by means of bonding resins, adhesive tapes or sticky wax. This article presents the indirect procedures of our clinic, which use paste-paste chemically cured composites. Detailed laboratory and clinical procedure for dual tray method and other application of indirect bonding will be presented.

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디지털 인상채득을 이용한 소구증을 가진 환자의 전악 임플란트 수복 (Digital impression taking for full-arch implant restoration to a patient with microstomia)

  • 심지석;류재준
    • 대한치과의사협회지
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    • 제56권11호
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    • pp.616-621
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    • 2018
  • This clinical case highlights the failure of long length implants, and the prosthodontic procedures necessary to rehabilitate the maxillary dentition of a patient with microstomia. The integrated digital technology of intra-oral scanning, computer-aided design, and three-dimensional printing can provide an alternative method to make conventional impressions for patients with microstomia who cannot insert the appropriate tray in their mouths.

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증류탑 성능평가에 적합한 소형 증류탑 개발 (Development of Small Distillation Column for Performance Evaluation of Distillation Column)

  • 김병철;조태제;김영한
    • Korean Chemical Engineering Research
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    • 제48권5호
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    • pp.668-671
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    • 2010
  • 증류시스템 검증용 소형 다단 증류 장치에 활용할 수 있는 소형 충전물을 사용하여 실험실 규모의 증류실험을 실시하였다. 직경 6.7 mm의 실린더형 스테인레스 스틸 충전물을 이용하여 충분한 겉보기 표면적을 얻었고, 액의 체류량과 체류 속도도 양호한 결과를 얻었다. HYSYS를 이용한 이론단수의 계산치와 증류실험치를 비교하여 27 cm 충전층에 대해서는 7 cm이고, 45 cm 충전층에 대해서는 8 cm의 충전층이 이론단 1 단에 해당함을 알았다. 상업용 일정구조 배열의 충전탑에서 8 cm의 충전층이 이론단 1 단에 해당함과 비교하면 유사한 증류효율을 얻을 수 있음을 보여 주었다. 이러한 결과는 증류관의 보온이 완벽할 때 가능하였으며, 실험실에서의 증류 실험에서는 보온이 중요함을 입증하였다. 본 실험 결과로부터 실험실에서도 실제 현장에서 사용하는 증류탑과 유사한 증류 시스템의 시험이 가능함을 보여 준다.