• Title/Summary/Keyword: S405

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SOME REMARKS ON ARTINIAN O-SEQUENCES OF LENGTH 7

  • Shin, Yong-Su
    • Journal of applied mathematics & informatics
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    • v.13 no.1_2
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    • pp.405-411
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    • 2003
  • We prove that 25 different Artinian O-Sequences of codimension 3 type 3 with length 7 among all possible 334 cases are not level.

DEVELOPMENT OF SIMULATION TOOL FOR ORBITAL MOTION OF METEOROID STREAM PARTICLES (METEOROID STREAM 입자들의 궤도 운동 시뮬레이션 TOOL 개발)

  • 김방엽
    • Journal of Astronomy and Space Sciences
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    • v.17 no.1
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    • pp.107-116
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    • 2000
  • This paper presents the preliminary survey and simulation results of the prediction of Leonid stream's orbital motion. Based on the model survey on eject velocity and perturbation of meteoroid particles, a simulation program was developed and applied to orbital motion of Leonid stream. The Jones ejection distribution model was used to describe the particle's eject velocity and the orbital dynamic model includes perturbations of major planet's gravity. DE405 ephemeris file generated by Solar System Dynamics Group at Jet Propulsion Laboratory in NASA was used for the planet's ephemeris calculations. Solar radiation pressure were also considered in the simulation and 8th order Runge-Kutta algorithm was used a numerical integration method.

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T—S Fuzzy Model-based Sampled-data Observer Design for Detecting Internal Oil Leakage in Single-rod Hydraulic Cylinder: LMI Approach (편로드 유압실린더 내부 누유 검출을 위한 T—S 퍼지 모델 기반 샘플치 관측기 설계: LMI 접근법)

  • Jee, Sung Chul;Kim, Hyogon;Park, Jeongwoo;Lee, Mun-Jik;Kang, Hyungjoo;Li, Ji-Hong
    • Journal of Ocean Engineering and Technology
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    • v.30 no.5
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    • pp.405-414
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    • 2016
  • This paper presents an internal oil leakage detection problem for a hydraulic single-rod cylinder. We derive the dynamics of the hydraulic cylinder as a state space model, and then design a T—S fuzzy model-based fault detection observer. We adopt an H observer design scheme so that the observer is robust against disturbance and relatively sensitive to the leakage fault. Sufficient design conditions are derived in the form of linear matrix inequalities. A numerical example is provided to verify the proposed techniques.

Growth Responses of Red and Blue Lettuce (Lactuca sativa L.) under Different Levels of Shading for Indoor Cultivation (실내재배를 위한 적상추와 청상추의 차광에 따른 생육 반응)

  • Ju, Jin-Hee;Kim, Tae-Yeon;Yoon, Yong-Han
    • Journal of Environmental Science International
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    • v.31 no.5
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    • pp.405-411
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    • 2022
  • Production of lettuce under indoor cultivation is highly affected by light intensity. In this study, we used shade cloth (commercial black net) to examine the effect of these condition on growth without an associated yield penalty of container-grown lettuce. Four levels of shading treatments (0%, 35%, 55%, and 75% referred to as Cont., S35, S55, and S75 with respect to Cont.) and two lettuce varieties (red and blue) were evaluated. Variety-specific growth responses were observed with respect to different levels of shading treatments. High growth of red lettuce was occurred in Cont. treatment despite plant height and leaf length being higher than Cont. However, under 35% shading treatment blue lettuce was higher than in control plants. The highest root length was observed 0% shading (Cont.) of both varieties. These results reinforce the idea that blue lettuce is the better leafy vegetable rather than red lettuce for indoor cultivation related to lower light intensity environment conditions.

Inverse Problems in Aerodynamics, Heat Transfer, Elasticity and Materials Design

  • Dulikravich, George S.;Dennis, Brian H.;Baker, Daniel P.;Kennon, Stephen R.;Orlande, Helcio R.B.;Colaco, Marcelo J.
    • International Journal of Aeronautical and Space Sciences
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    • v.13 no.4
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    • pp.405-420
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    • 2012
  • A number of existing and emerging concepts for formulating solution algorithms applicable to multidisciplinary inverse problems involving aerodynamics, heat conduction, elasticity, and material properties of arbitrary three-dimensional objects are briefly surveyed. Certain unique features of these algorithms and their advantages are sketched for use with boundary element and finite element methods.

Analysis of the Stress Characteristics of Double Layered Tube at Elevated Temperature (고온에서 이중튜브의 열응력특성해석)

  • Kim, E.H.;Jang, J.H.;Park, S.P.;Moon, Y.H.
    • Transactions of Materials Processing
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    • v.19 no.7
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    • pp.405-410
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    • 2010
  • Double layered tube that has been used for transportation and oil piping system is occasionally exposed to elevated temperature. The change in stress state at elevated temperature is important for the safe design of double layered tube. In this study, the variation of stress state for hydroformed double layered tube of which inner tube is stainless steel and outer tube is mild steel has been analytically analyzed. To characterize the thermal stress at elevated temperature, analytical model to provide thermal stresses between outer tube and inner tube was developed by using theories of elasticity and Lame equation. The feasibility of analytical model is verified by finite element analysis using ANSYS $CLASSIC^{TM}$, commercially available code. The variation of thermal stress at various thickness combination of inner and outer tube has also been investigated by proposed analytical model.

An Experimental Study on the Aerodynamic Drag of Model Cars with Cooling Air Passage (냉각유동이 자동차항력에 미치는 영향에 관한 실험적 연구)

  • 안이기;정형호;김광호
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.18 no.2
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    • pp.405-413
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    • 1994
  • This paper presents the experimental results of aerodynamic drags of model cars. The effects of cooling air on total drag were introduced by using momentum theorem. Vehicle-liked Ahmed body and 1/5 model car were used to evaluate the increments of drags due to the internal flow. The results were compared with momentum theorem and other's experiments and showed good agreements. In the case of Ahmed body, drags were increased by 22% due to the internal flow and decreased linealy by reducing internal air flow rates and inlet areas. The experiments on 1/5 model car with ill-defined air flow passage showed 10% increment of drag. The results of present study showed that cooling drag could be predicted by momentum theorem within small errors.

The Effect of Cr doping on the Magnetic and Magnetocaloric Properties of MnCoGe Alloys

  • Emre, S. Yuce
    • Journal of Magnetics
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    • v.18 no.4
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    • pp.405-411
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    • 2013
  • The structural, magnetic and magnetocaloric properties of $CoMn_{1-x}Cr_xGe$ (x=0.05-0.125) have been investigated by using electron microscopy, x-ray diffraction, calorimetric and magnetic measurements. In this study, our aim is to justify the magnetocaloric effect by tuning the structural and magnetic transition temperature with Cr doping on CoMnGe pure system. The substitution of Cr for Mn leads to a decrease of both structural and magnetic transition temperatures. However, structural and magnetic transition temperatures do not close to each other. From magnetization measurement, we calculate that isothermal entropy change associated with magnetic transition can be as high as 3.82 J $kg^{-1}K^{-1}$ at 302 K in a field of 7 T. Meanwhile, structural phase transition contribution to isothermal entropy change is calculated as 5.85 J $kg^{-1}K^{-1}$ at 322 K for 7 T.