• Title/Summary/Keyword: Linear Cell

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Micro-electrochemical Characteristics of Sensitized 304 Stainless steel Using Micro-droplet cell Techniques (마이크로 드로플릿 셀 기법을 이용한 예민화 된 304 스테인리스강의 미세전기화학 특성)

  • Kim, Kyu-Seop;Lee, Jae-Bong
    • Corrosion Science and Technology
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    • v.9 no.6
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    • pp.300-309
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    • 2010
  • The influences of sensitization on localized corrosion resistance of 304 stainless steel, were investigated, using micro-dropletcell techniques. Micro-droplet cell allows one to align the micro-electrode to the desired spot of the working electrode and measure directly local current with the potentiodynamic polarization, linear polarization and a.c. impedance. Micro-electrochemical tests were carried out inside of the grain and on grain boundaries separately. It was found that sensitization decreased the pitting potential, increasing corrosion current density around grain boundaries. Galvanic current density was also measured between grain and grain boundaries.

Robust Design of Air Compressor-Driving Quadratic Linear Actuator in Fuel Cell BOP System using Taguchi Method

  • Kim, Jae-Hee;Kim, Jun-Hyung;Kim, Jin-Ho
    • Journal of Magnetics
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    • v.17 no.4
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    • pp.275-279
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    • 2012
  • The linear actuator has the inherent drawback of air gap variation because its linear motion is usually guided by the springs, which destabilizes the dynamic performance. In order to design the linear actuator to be insensitive to air gap, this paper describes the robust design of the air compressor driving linear actuator using Taguchi method. The orthogonal arrays are constructed with selected control factors and noise factor for minimum experiment. The control factors are thickness of inner magnet, height of upper yoke, thickness of outer magnet and thickness of lower yoke while noise factor is airgap. The finite element analysis using commercial electromagnetic analysis program "MAXWELL" are performed instead of experiment. ANOVA are performed to investigate the effects of design factors. In result, the optimal robust linear actuator which is insensitive to air gap variation is designed.

An assignment method for part-machine cell formation problem in the presence of multiple process routes

  • Won, You-Kyung;Kim, Sehun
    • Proceedings of the Korean Operations and Management Science Society Conference
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    • 1994.04a
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    • pp.236-243
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    • 1994
  • In this paper we consider the part-machine cell formation decision of the generalized Group Technology(GT) problem in which multiple process routes can be generated for each part. The existing p-median model and similarity coefficient algorithm can solve only small-sized or well-structured cases. We suggest an assignment method for the cell formation problem. This method uses an assignment model which is a simple linear programming. Numerical examples show that our assignment method provides good separable cells formation even for large-sized and ill-structured problems.

Amperornetric Determination of Ascorbic Acia at a Thin Layer Flow Cell

  • Hahn, Young-Hee
    • Archives of Pharmacal Research
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    • v.11 no.1
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    • pp.56-60
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    • 1988
  • A thin layer flow cell with cell volume of $8\;{\mu}{\ell}$ was constructed. Diffusion currents of ascorbic acid was directly proportional to the 1/3 power of volume flow rates. A linear dynamic range was obtained at the concentration range between $10^{-7}\;M\;and\;10^{-4}\;M$ of ascorbic acid with a detection limit of $10^{-8}\;M$. Ascorbic acid in the multivitamin product was amperometrically determined at TLFC after simply dissolving mg range ground product in $100m{\ell}$ of pH 7.0 phosphate buffer.

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Area Measurement of Organism Image using Super Sampling and Interpolation (수퍼 샘플링과 보간을 이용한 생물조직 영상의 면적 측정)

  • Choi, Sun-Wan;Yu, Suk-Hyun
    • Journal of Korea Multimedia Society
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    • v.17 no.10
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    • pp.1150-1159
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    • 2014
  • This paper proposes a method for extracting tissue cells from an organism image by an electron microscope and getting the whole cell number and the area from the cell. In general, the difference between the cell color and the background is used to extract tissue cell. However, there may be a problem when overlapped cells are seen as a single cell. To solve the problem, we split them by using cell size and curvature. This method has a 99% accuracy rate. To measure the cell area, we compute two areas, the inside and boundary of the cell. The inside is simply calculated by the number of pixels. The cell boundary is obtained by applying super sampling, linear interpolation, and cubic spline interpolation. It improves the error rate, 18%, 19%, and 120% respectively, in comparison to the counting method that counts a pixel area as 1.

Response of Photobacterium phosphoreum to Heavy Metal (Photobacterium phosphoreum의 중금속에 대한 반응성)

  • 정계훈;김현숙;이은수;정성제;이정건;김은기;전억한
    • KSBB Journal
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    • v.14 no.3
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    • pp.342-350
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    • 1999
  • Photobacterium phosphoreum was used in order to study response to heavy metal including $HgCl_2$, $CdCl_2$, $MnSO_4$ and $ZnSO_4$ in view of developing monitoring system for toxic substances. The concentrations of heavy metal causing 50% reduction($EC_{50}$) in bioluminescence intensity were determined with both free and immobilized P. phosphoreum. The bioluminescence responses were examined at various concentrations of heavy metal after 10, 20 and 30 min of exposure. The linear correlation between Gamma values and concentrations of heavy metal was obtained and $EC_{50}$ was calculated from the linear correlation. The significant inhibitory concentrations for bioluminescence emission were found to be 0.05mg/L for $HgCl_2$, 25mg/L for $CdCl_2$, 50mg/L for $MnSO_4$ and 12.5mg/L for $ZnSO_4$, respectively. The free cell and disc type were shown to be more sensitive to heavy metal than cells mixed with Na-alginate or immobilized on Sr-alginate. However, the linear regression curves were derived from the Sr-alginate immobilized cells indicating the immobilization method is a useful tool for monitoring of heavy metal under more stable condition of bioluminescence.

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An Estimation Technique of Cell ID and DoA for a Mobile Relay Station Under a Multipath Channel (다중 경로 채널에서의 이동 릴레이의 셀 탐색 및 DoA 추정 방법)

  • Pec, Rothna;Kim, In Su;Cho, Yong Soo
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.38A no.1
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    • pp.58-67
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    • 2013
  • In this paper, a mobile relay station(MRS) for vehicles with a beamforming antenna is considered to increase the reliability of a transmission link, especially for the MRS at cell boundary. Cell searching and direction-of-arrival(DoA) estimation methods for an MRS with a uniform linear array(ULA) are proposed for a multipath environment in OFDM-based cellular systems. Performances of the proposed methods(Method1 and Method2) are evaluated by computer simulation with the standard profile of IEEE 802.16e.

Analysis on the Characteristics of RICEM for Researching Combustion Characteristics of Linear Hydrogen Power System (리니어 수소동력시스템의 연소연구용 급속흡입압축기의 특성 해석)

  • Lee, J.H.;Kim, K.M.;Jeong, D.Y.;Lee, Jong-T.
    • Transactions of the Korean hydrogen and new energy society
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    • v.16 no.1
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    • pp.66-73
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    • 2005
  • Hydrogen linear power system is estimated as the next generation power system which can obtain a performance as same as fuel cell. In order to develop Hydrogen combustion power system with high thermal efficiency, it is very important to understand the basic characteristics of hydrogen combustion and establish combustion stabilization technique of its system. In this study, RICEM(Rapid Intake Compression Expansion Machine) for researching of hydrogen combustion linear power system was manufactured and evaluated, and the basic characteristics of linear RICEM were analyzed.

Performing linear regression with responses calculated using Monte Carlo transport codes

  • Price, Dean;Kochunas, Brendan
    • Nuclear Engineering and Technology
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    • v.54 no.5
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    • pp.1902-1908
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    • 2022
  • In many of the complex systems modeled in the field of nuclear engineering, it is often useful to use linear regression-based analyses to analyze relationships between model parameters and responses of interests. In cases where the response of interest is calculated by a simulation which uses Monte Carlo methods, there will be some uncertainty in the responses. Further, the reduction of this uncertainty increases the time necessary to run each calculation. This paper presents some discussion on how the Monte Carlo error in the response of interest influences the error in computed linear regression coefficients. A mathematical justification is given that shows that when performing linear regression in these scenarios, the error in regression coefficients can be largely independent of the Monte Carlo error in each individual calculation. This condition is only true if the total number of calculations are scaled to have a constant total time, or amount of work, for all calculations. An application with a simple pin cell model is used to demonstrate these observations in a practical problem.

An Optimal Solution of Machine Cell Formation Problem (기계 그룹 형성 문제의 최적해)

  • Choi Seong-Hoon
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.27 no.3
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    • pp.7-13
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    • 2004
  • In this paper, machine cell formation problem is discussed. To reflect precisely actual manufacturing situations such as routing sequences, production quantities, and machining (or operation) characteristics, a new network presentation (or the problem is proposed. It is formulated as a simple 0-1 quadratic programming model with linear constraints. Then, the model is converted into a 0-1 integer programming model using a variable transformation technique. Lastly, some computational results are presented.