• Title/Summary/Keyword: stationary solution

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Formation of protoplasts from pyricularia oryzae (벼 도열병균, pyricularia oryzae의 원형질체 형성)

  • 이용환;정후섭
    • Korean Journal of Microbiology
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    • v.23 no.3
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    • pp.209-214
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    • 1985
  • The optimum conditions of protoplasts formation from Pyricularia oryzae were investigated with lytic enzymes and osmotic stabilizers. The mycelia were begun to refease the protoplasts in response to the complex enzyme solution after 30-60 minutes and reached to maximum after 2-3hrs. Among the lytic enzymes tested, the mixture solution containing ${\beta}-Glucuronidase$(0.01 ml/ml), Cellulase ONOZUKA-RS(20mg/ml), Driselase (10mg/ml), and Macerozyme R-10 (10mg/ml) resulted in the highest rate of protoplasts releasing of Pyricularia oryzae. The best stabilizer was 0.6M KCl at pH 7.0. Shen the mycelia were digested with enzyme mixture, the stationary culture was better than shaking culture for higher protoplast formation.

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An improved Ordering and Recovery Policy for Reusable Items (재활용품 제고시스템에 대한 주문 및 재생정책의 개선방안)

  • Jung, Jin-A;Koh, Shie-Gheun
    • Journal of Korean Institute of Industrial Engineers
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    • v.34 no.1
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    • pp.32-41
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    • 2008
  • This paper studies a joint EOQ and EPQ model in which a stationary demand can be satisfied by recycled products as well as newly purchased products. The model assumes that a fixed quantity of the used products are collected from customers and later recovered for reuse. The recovered products are regarded as perfectly new ones. We also assume that the number of orders for newly purchasing items and the number of recovery setups in a cycle can be mutually independent integers. Under these assumptions, we develop an optimization model obtaining the economic order quantity for newly procured products, the optimal lot size for the recovery process, and the sequence of the orders and the setups, simultaneously. And then a simple solution procedure to find a local optimal control parameter set is proposed. To validate the model and the solution procedure, finally, some computational experiments are presented.

Development of Intelligent Surveillance System Using Stationary Camera for Multi-Target-Based Object Tracking (다중영역기반의 객체추적을 위한 고정형 카메라를 이용한 지능형 감시 시스템 개발)

  • Im, Jae-Hyun;Kim, Tae-Kyung;Choi, Kwang-Yong;Han, In-Kyo;Paik, Joon-Ki
    • Proceedings of the IEEK Conference
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    • 2008.06a
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    • pp.789-790
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    • 2008
  • In this paper, we introduce the multi-target-based auto surveillance algorithm. Multi-target-based surveillance system detects intrusion objects in the specified areas. The proposed algorithm can divide into two parts: i) background generation, ii) object extraction. In this paper, one of the optical flow equation methods for estimation of gradient method used to generate the background [2]. In addition, the objects and back- ground video images that are continually entering the differential extraction.

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Theoretical Temperature Analysis for 88316 Piping Weld (SS316강 배관 용접부에 대한 이론적 온도해석)

  • Kim, Jong-Sung;Lee, Seung-Gun;Jin, Tae-Eun;Kwon, Soon-Man
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.27 no.10
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    • pp.1623-1629
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    • 2003
  • In this paper, the arc beam is considered as a moving disc heat source with a pseudo-Gaussian distribution of heat intensity. The solution for temperature distribution on welds is derived by using the image heat source method and the superposition method. It is general solution in that it can determine the temperature-rise distribution in and around the arc beam heat source, as well as the width and depth of the melt pool (MP) and the heat-affected zone (HAZ) in welding short lengths, where quasi-stationary conditions may not have been established. As a comparative study, the results of this analytical approach has been compared with that of the finite-element modeling. As a result, The theoretical analysis presented here has shown good consistency and is more time/cost-effective method compared with FEM.

Characteristic Equation to Determine Optimal Ejection Conditions of Sounding Rocket: Analytic Solution Cases (사운딩로켓의 최적 분사조건 결정을 위한 특성방정식: 해석적 해의 경우)

  • Lee, Sang-Hyeon
    • Journal of the Korean Society of Propulsion Engineers
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    • v.17 no.1
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    • pp.26-34
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    • 2013
  • An analytic approach to determine the optimal conditions for maximizing altitude of a sounding rocket is suggested. The behavior of the one-dimensional momentum equation including thrust, gravitational force and aerodynamic drag force is investigated. For the case where an analytic solution exists, a characteristic equation for determining optimal condition for maximizing altitude at the burn-out state and that for maximizing altitude at the stationary state are developed and verified with numerical experiments.

The Calculation of Three-Dimensional Viscous Flow in a Transonic, Multi-Stage Axial Compressor (다단축류압축기내의 천음속 점성유동에 대한 삼차원 수치해석)

  • Yi H. W.;Kim K. Y.
    • 한국전산유체공학회:학술대회논문집
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    • 1998.05a
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    • pp.181-189
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    • 1998
  • A numerical study based on the three-dimensional Reynolds averaged Navier-Stokes equations is presented to analyze the transonic flowfield through two-stage axial compressor. Explicit four-step Runge-Kutta scheme is used for solution algorithm, and local time step and implicit residual averaging are introduced for enhancing the convergency. Artificial dissipation model is adopted to assure the stability of solution. The solver is coupled with Baldwin-Lomax model to describe turbulence. To avoid calculating the unsteady flow, a mixing process is modeled at a station between rotating and stationary blade rows. Results show a variety of important physical phenomena. Comparison of the flowfields with and without tip clearance shows that the effect is considerable in this flowfield. Comparisons with experimental data carried out to validate the calculational results show reasonable agreements. Some remedies are also suggested to improve the revealed problems.

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고체상 미량분석법(SPME)을 이용한 GC/FID에서의 BTEX 및 TCE 동시 분석

  • 이재선;장순웅;이시진
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 2003.04a
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    • pp.405-408
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    • 2003
  • The soild phase microextraction(SPME)fiber which contains 100${\mu}{\textrm}{m}$ polydimethyl siloxane of a stationary phase was used for the analysis of volatile organic compounds contained in aqueous solution. volatile organic compounds, which were spiked in blank water and extracted by the headspace SPME techique, were analyzed by gas chromatography/flame ionization detector(GC/FID). The optimu condition of SPME fiber is determined that the analytes were extracted for 40min from extracts by using PDAfS100${\mu}{\textrm}{m}$ fiber. This new method could have wide application for the analysis of VOCs in aqueous solution.

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A flow phenomenon of aquaous polymer solution in couette flow of concentric cylinder with wide circular (넓은 환상간극을 가진 동심원통속의 couette 흐름에서 고분자수용액의 유동현상)

  • 권혁칠;이성노;정진도
    • Journal of the korean Society of Automotive Engineers
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    • v.15 no.3
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    • pp.81-88
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    • 1993
  • This report describes the experimental research on the flow phenomena of the aq uaous polymer solution within the Cuette flow of the concentric, cylinders type with a wide circular gap. We have investigated the phenomena of the fluid flow through torque measuring in the system that the inner cylinder is stationary and the outer one is rotating. Geometrical parameters of the system are the gap ratio of t/R$_{0}$=0.2 and Aspect ratio of l/t=100. The torque increases considerably in about 420-480RPM, So, it is considered a turbulent transition boundary, the higher plymer concentration is, the lower torque value is and the higher transition Reynolds number is. In each of the polymer concentration, the unstable boundary of torque, that is, idiosyncrasies of torque is observed around 220-280RPM. and the boundary is looked upon as a resonant vibration which is caused by the inner cylinder and tortional vibration of torque sensor.r.

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Transition-State Structures for Solvolysis of Methanesulfonyl Chloride

  • 양기열;강금덕;구인선;이익준
    • Bulletin of the Korean Chemical Society
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    • v.18 no.11
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    • pp.1186-1191
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    • 1997
  • Solvolyses of methanesulfonyl chloride (CH3SO2Cl) in water and methanol have been studied theoretically using ab initio self-consistent reaction field (SCRF) molecular orbital method. All stationary structures including transition state on the potential energy surface in solution have been found and compared with the gas phase structures. The overall reaction occurs via a concerted SN2 mechanism with a non-cyclic trigonal bipyramidal transition state, and the activation barrier is lowered significantly in solution. The transition state for the hydrolysis reaction is looser than that for the methanolysis reaction, and this is in accord with the experimental findings that an SN2 type mechanism, which is shifted toward an SN1 process or an SAN process in the hydrolysis and alcoholysis reaction, respectively, takes place. The catalytic role of additional solvent molecules appears to be a purely general-base catalysis based on the linear transition structures. Experimental barrier can be estimated by taking into account the desolvation energy of nucleophile in the reaction of methanesulfonyl chloride with bulk solvent cluster as a nucleophile.

Effects of Source Correlation on Plates Driven by Multi-point Random Forces (불규칙 작용힘들간의 Correlation이 평판의 진동레벨에 미치는 영향)

  • Oh, S.G.;Park, J.D.;Kwak, C.S.
    • Journal of the Korean Society for Precision Engineering
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    • v.11 no.1
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    • pp.166-176
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    • 1994
  • The problem of reducing the vibration level of elastic plates driven by multiple random point forces is analyzed in this study. First, the analytical solution for the vibration level of finite thin plates with four simply supported edges under the action of multiple random point force is derived. By assuming the plates to be lightly damped, an approximate solution for the vibration level of the plate is obtained. A numerical study is carried out to determine an optimal spacing distance between the multiple point forces in order to produce a relative minimum in the plate's vibration level. The optimal spacing distance is shown to depend on the given excitation band. The effects of wave cancellation in the near field of the multiple point forces are discussed by using the equivalence of certain stationary random responses and deterministic pulse responese.

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