• Title/Summary/Keyword: Simulation-X$^{(R)}$

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A Study on the Efficiency of a Load Sensing Main Control Valve Using SimulationX (SimulationX를 이용한 부하 감지형 메인 컨트롤밸브의 효율에 관한 연구)

  • Kim, Dong Myoung;Lee, Jung Min;Jung, Won Jee;Jang, Joo Sup
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.40 no.1
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    • pp.87-95
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    • 2016
  • In this study, we develop a model of an open center and load-sensing system and for a main control valve to analyze system characteristics and efficiency using SimulationX. In order to analyze the operating characteristics of the pressure and flow of the main control valve of an open center system, a test was performed at each port. The reliability of the model was confirmed by comparing the similarity of the analysis results with the test results before analyzing the operating characteristics of the system. Development of the load sensing main control valve was performed by adding a flow sharing valve and a notched shape to the open center system based on it's the proven reliability. The authors performed the simulation under the same load conditions in order to compare the efficiency of the systems. Additionally, the combined operation performance was investigated by means of analyzing the characteristics of flow distribution under different load conditions.

A Study on the Bayes Estimator of θ=Pr(Y < X)

  • Yeum, Joon Keun;Kim, Jae Joo
    • Journal of Korean Society for Quality Management
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    • v.13 no.2
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    • pp.8-12
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    • 1985
  • We study the Bayes estimation procedure of ${\theta}=P_r$=(Y < X) when the experiment is terminated before all of the items on the test have failed and the failed items are partially replaced. Comparisons with the M.L.E., M.V.U.E. and Bayes estimator are made through Monte Carlo simulation.

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The accuracy of reformatted images using a new virtual 3-dimensional dental implant system (국내에서 개발된 3차원 임플란트 가상시술 시스템에 의한 영상재구성상의 정확도)

  • Choi Jin-Seok;Kim Eun-Kyung;Han Won-Jeong
    • Imaging Science in Dentistry
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    • v.33 no.3
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    • pp.187-193
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    • 2003
  • Purpose: To compare the measurements of the mandible and the detectability of the mandibular canal on reformatted images using a newly developed 3-dimensional implant simulation program with traditionally used CT multiplanar reconstruction program and true measurements. Materials and Methods: Ten dry dog mandibles were used in this study. Occlusal templates for CT examination were fabricated and marked with gutta perch a at ten sites. Axial CT scans were taken and reconstructed using DentaScan (D group) and Vimplant program (V group), and each mandible was sectioned at the previously marked sites (R group). Maximum vertical height (H) and maximum width (W) of the mandible, the distances from buccal border of the mandibular canal to the most buccal aspect of the mandible (X), and the distance from the superior border of the mandibular canal to the alveolar crest (Y) were measured, and the mandibular measurements in each group were compared. Detectability of mandibular canal was evaluated using a 3-point scale in both V and D groups by three oral radiologists and compared. Results: H in the V group was slightly greater than that in the D group, and Wand X in the V group was slightly less than those in the D group. H in the V group was less than that in the R group, and Wand X in the V group was larger than those in the R group. The detectability of the mandibular canal did not show statistically significant differences between V and D groups. Conclusion: The results of the experiment show that the newly developed, inexpensive Vimplant/TM/ simulation program can be used as an alternative to the traditionally used, and more expensive CT multiplanar reconstruction program.

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Molecular Dynamics Simulation of Enantioselectivity in Metoprolol in complex

  • Jang, Seok-Young;Park, Kyung-Lae
    • Proceedings of the PSK Conference
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    • 2002.10a
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    • pp.356.3-357
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    • 2002
  • Metoprolol (MT) is one kinds of adrenergic beta-blockers. Its (S)-enantiomer is known to be more active than the (R). Recently. the x-ray structure of beta-blocker. (S)-propranolol (a-naphthyl analogue), complexed in a mould fungal cellulase. Cel7A. was reported and the (R)-form did not build any complex. And in our previous study the conformation and stability of MT in carboxymethylated beta-cyclodextrin (BCD) complex was determined by NMR. HPLC, UV and electrophoresis measurement. (omitted)

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Case of Improving Design by Using Analysis Model of Hydraulic System for Dental Chair (치과용 유니트체어 유압구동 시스템 해석모델을 활용한 개선설계 사례)

  • Dae Kyung Noh;Dong Won Lee;Taek June Kim;Joo Sup Jang
    • Journal of Drive and Control
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    • v.20 no.2
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    • pp.1-6
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    • 2023
  • This study aims to develop a Korean dental chair hydraulic circuit by improving the existing equipment in order to localize foreign leading companies' products. The suggested Hydraulic circuit can be applicable to varied sectors where height and backrest angle control of chair-type equipment are required. The study followed the steps below. First, three kinds of foreign hydraulic circuits were analyzed and three kinds of Korean dental chair hydraulic circuits were suggested. Second, it was determined whether the three kinds of Korean hydraulic circuits operate normally through SimulationX, a software specialized in multi domain analysis, and the effectiveness of each circuit was examined.

A Simulation Study of the Inset-fed 2-patch Microstrip Array Antenna for X-band Applications (X-band 대역용 2-패치 마이크로스트립 인셋 급전 어레이 안테나 시뮬레이션 연구)

  • Nkundwanayo Seth;Gyoo-Soo Chae
    • Advanced Industrial SCIence
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    • v.3 no.2
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    • pp.31-37
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    • 2024
  • This paper presents a single and 2-patch microstrip array antenna operated on a frequency of 10.3GHz(x-band). It outlines the process of designing a microstrip patch array antenna using CST MWS. Initially, a single microstrip antenna was designed, followed by optimization using CST MWS to attain optimal return losses and gain. Subsequently, the design was expanded to create a 2×1 microstrip inset-fed array antenna for the X-band applications. The construction material is Roger RO4350B, with specific dimensions (h=0.79mm, 𝜖r = 3.54). The achieved results include an S11 of -18dB at the resonant frequency (10.3GHz), a gain of 9.82dBi, a bandwidth of 0.165GHz, and a 3-dB beamwidth of 30°, 121° in Az(𝜑=0) and El(𝜑=90) plane, respectively. The future plan involves the fabrication of this array antenna and further expansion to a 4×4 array of microstrip antennas. It is then incorporated on the X-band applications for practical uses.

Nonlinear control of unicycle-type mobile robot (Unicycle-type 이동로봇의 비선형 제어)

  • 김용진;문인혁
    • Proceedings of the IEEK Conference
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    • 2001.06e
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    • pp.131-134
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    • 2001
  • This paper proposes a stable control rule for nonlinear unicycle-type mobile robot. The control method uses a local error coordinate system, velocity and distance constants $\kappa$$\_$x/, $\kappa$$\_$y/, and he. Stability of control rule is proved Liapunov function. System input to the mobile robot is reference posture ($\chi$$\_$r/, y$\_$r/, $\theta$$\_$r/)/sup/ $\tau$/ and reference e velocity (ν$\_$r/,$\omega$$\_$r/)$\^$$\tau$/. System output of the mobi-le robot is velocity of driving wheels. We introduce limit velocity for preventing high initial speed. From simulation results, we can see the proposed control rule is stable.

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Numerical Simulation on the Formation and Pinching Plasma in X-pinch Wires on 2-D Geometry (자기유체역학 코드를 이용한 축 대칭 엑스 핀치 플라즈마 구조의 2차원 전산해석)

  • Byun, Sangmin;Na, Yong-Su;Chung, Kyoung-Jae;Kim, Deok-Kyu;Lee, Sangjun;Lee, Chanyoung;Ham, Seunggi;Ryu, Jonghyeon
    • Journal of the Korea Institute of Military Science and Technology
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    • v.24 no.2
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    • pp.211-218
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    • 2021
  • This paper deals with the computational work to characterize the formation and pinching of a plasma in an X-pinch configuration. A resistive magnetohydrodynamic model of a single fluid and two temperature is adopted assuming a hollow conical structure in the (r,z) domain. The model includes the thermodynamic parameter of tungsten from the corrected Thomas-Fermi EOS(equation of state), determining the average ionization charge, pressure, and internal energy. The transport coefficients, resistivity and thermal conductivity, are obtained by the corrected Lee & More model and a simple radiation loss rate by recombination process is considered in the simulation. The simulation demonstrated the formation of a core-corona plasma and intense compression process near the central region which agrees with the experimental observation in the X-pinch device at Seoul National University. In addition, it confirmed the increase in radiation loss rate with the density and temperature of the core plasma.