• Title/Summary/Keyword: Monte Carlo collision

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The particle analysis on electron transport coeffcient at N2N2 gas atmosphere (N2N2 가스에서 전자의 수송현상에 대한 입자적 해석)

  • Lee, Yong-Sin;Shim, Jae-Hak;Ko, Kwang-Cheol;Kang, Hyung-Boo
    • Proceedings of the KIEE Conference
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    • 1996.07c
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    • pp.1932-1934
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    • 1996
  • Electron transport coefficients are calculated in nitrogen over the E/p range 50700Vcm150700Vcm1 Torr1Torr1 by a Monte Carlo method, using a set of electron collision cross sections measured by authors.

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Evaluating the Reduction of Spatial Scattering based on Lead-free Radiation Shielding Sheet using MCNPX Simulation (MCNPX 시뮬레이션을 이용한 무납 방사선 차폐 시트 기반의 공간산란 저감화 평가)

  • Yang, Seung u;Park, Geum-byeol;Heo, Ye Ji;Park, Ji-Koon
    • Journal of the Korean Society of Radiology
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    • v.14 no.4
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    • pp.367-373
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    • 2020
  • Most of the spatial scattered dose caused by the scattered rays generated by the collision between the object and X-rays is relatively easily absorbed by the human body as electromagnetic waves in the low energy region, thereby increasing the degree of radiation exposure. Such spatial scattering dose is also used as an indicator of the degree of radiation exposure of radiation workers and patients, and there is a need for a method to reduce exposure by reducing the spatial scattered dose that occurs indirectly. Therefore, in this study, a lead-free radiation shielding sheet was proposed as a way to reduce the spatial scattering dose, and a Monte Carlo (MC) simulation was performed based on a chest X-ray examination. The absorbed dose was calculated and the measured value and the shielding rate were compared and evaluated.

Drift Velocities for Electrons in SF6SF6-Ar Mixtures Gas (SF6ArSF6Ar-혼합기체(混合氣體)의 전자(電子) 이동속도(移動速度))

  • Kim, Sang-Nam;Ha, Sung-Chul
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2003.07b
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    • pp.1102-1105
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    • 2003
  • Energy distribution function for electrons in SF6SF6-Ar mixtures gas used by MCS-BEq algorithm has been analysed over the E/N range 30300[Td]30300[Td] by a two term Boltzmann equation and by a Monte Carlo Simulation using a set of electron cross sections determined by other authors, experimentally the electron swarm parameters for 0.2(%) and 0.5(%) SF6SF6-Ar mixtures were measured by time-of-flight(TOF) method, The results show that the deduced electron drift velocities, Electrons Drift Velocities for a rang of E/N values. As a consequence, it was known that the spatial growth rates and the dielectric behaviors in SF6SF6-Ar mixtures are strongly dependent on the addition rate of SF6SF6 gas but the transport coefficients of electrons are insensitive to the addition rate of SF6SF6 gas. The results obtained from Boltzmann equation method and Monte Carlo simulation have been compared with present and previously obtained data and respective set of electron collision cross sections of the molecules.

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Numerical Simulation of the Coalescence of Air Bubbles in Turbulent Shear Flow: 1. Model Development (난류전단 흐름에서의 기포응집에 관한 수치모의: 1. 모형의 개발)

  • Jun, Kyung Soo;Jain, Subhash C.
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.14 no.6
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    • pp.1357-1363
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    • 1994
  • A Monte-Carlo simulation model is developed to predict size distribution produced by the coalescence of air bubbles in turbulent shear f1ow. The simulation consists of generating a population of air bubbles into the initial positions at each time step and tracking them by simulating motions and checking collisions. The radial displacement of air bubbles in the simulation model is produced by numerically solving an advective diffusion equation. Longitudinal displacements are generated from the logarithmic flow velovity distribution and the bubble rise velocity. Collision of air bubbles for each time step is detected by a geometric test using their relative positions at the beginning of the time step and relative displacements during the time step. At the end of the time step, the total number of bubbles, their positions, and sizes are updated. The computer program is coded such that minimum storages for sizes and positions of bubbles are required.

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Location Estimation and Obstacle tracking using Laser Scanner for Indoor Mobile Robots (실내형 이동로봇을 위한 레이저 스캐너를 이용한 위치 인식과 장애물 추적)

  • Choi, Bae-Hoon;Kim, Beom-Seong;Kim, Eun-Tai
    • Journal of the Korean Institute of Intelligent Systems
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    • v.21 no.3
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    • pp.329-334
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    • 2011
  • This paper presents the method for location estimation with obstacle tracking method. A laser scanner is used to implement the system, and we assume that the map information is known. We matches the measurement of the laser scanner to estimate the location of the robot by using sequential monte carlo (SMC) method. After estimating the robot's location, the pose of obstacles are detected and tracked, hence, we can predict the collision risk of them. Finally, we present the experiment results to verify the proposed method.

The mean Energy in SiH4ArSiH4Ar mixtures (SiH4ArSiH4Ar혼합기체의 평균에너지)

  • Kim, Sang-Nam
    • Proceedings of the KIEE Conference
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    • 2007.11c
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    • pp.155-159
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    • 2007
  • This paper calculates and gives the analysis of electron swarm transport coefficients as described electric conductive characteristics of pure Ar, pure SiH4SiH4, ArSiH4ArSiH4 mixture gases (SiH4SiH4--0.5%, 2.5%, 5%) over the range of E/N =0.013000.01300[Td], P=0.1, 1, 5.0[Torr] by Monte Carlo the Backward prolongation method of the Boltzmann equation using computer simulation without using expensive equipment. The results have been obtained by using the electron collision cross sections by TOF, PT SST sampling, compared with the experimental data determined by the other author. It also proved the reliability of the electron collision cross sections and shows the practical values of computer simulation.

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Performance Analysis of Collision Probability Between Primary User and Secondary Users in Spectrum Sensing Cognitive Radio Network With Synchronization Errors (동기화 에러가 존재하는 스펙트럼 감지 무선 인지 네트워크에서 일차 사용자와 이차 사용자들 간의 충돌 확률 분석)

  • Hong, Seung Geun;Im, Gyeongrae;Lee, Jae Hong
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 2017.11a
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    • pp.21-23
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    • 2017
  • 본 논문에서는 스펙트럼 감지 무선 인지 네트워크에서 동기화 에러가 존재하는 환경을 고려한다. 동기화에러가 존재 할 때 주어지는 오검출 확률(miss detection probability)을 이용하여 일차 사용자와 이차 사용자들 간의 충돌 확률(collision probabliyt)를 유도한다. 유도된 수식을 몬테 카를로 모의실험(Monte Carlo simulation)을 통해 확인한다.

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The analysis on the electron swarm parameter in SiH4SiH4+Ar mixtures (SiH4SiH4+Ar혼합기체의 전자군 파라미터 해석)

  • Seong, Nak-Jin;Kim, Sang-Nam
    • Proceedings of the KIEE Conference
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    • 2002.06a
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    • pp.106-109
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    • 2002
  • This paper calculates and gives the analysis of electron swarm transport coefficients as described electric conductive characteristics of pure Ar, pure SiH4SiH4, Ar + SiH4SiH4 mixture gases (SiH4SiH4--0.5%, 2.5%, 5%) over the range of E/N =0.01300[Td]. P=0.1, 1, 5.0[Torr] by Monte Carlo the Backward prolongation method of the Boltzmann equation using computer simulation without using expensive equipment. The results have been obtained by using the electron collision cross sections by TOF. PT.SST sampling, compared with the experimental data determined by the other author. It also proved the reliability of the electron collision cross sections and shows the practical values of computer simulation.

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Electron Transport Characteristic in SF6N2SF6N2 Mixture Gases by MCS-BEq Simulation (시뮬레이션에 의한 SF6N2SF6N2 혼합기체의 전자수송특성)

  • Kim, Sang-Nam
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2006.06a
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    • pp.507-508
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    • 2006
  • SF6SF6 gas is widely used in industrial of insulation field. In this paper, N2N2 is mixed to improve pure SF6SF6 gas characteristics. Electron transport coefficients in SF6N2SF6N2 mixture gases are simulated in range of E/N values from 70 to 400 [Td] at 300K and 1 Torr by using Boltzmann equation method. The results have been obtained by using the electron collision cross sections by TOF, PT, SST sampling, compared with the experimental data determined by the other author. It also proved the reliability of the electron collision cross sections and shows the practical values of computer simulation. The result of Boltzmann equation and Monte Carlo Simulation has been compared with experimental data by Ohmori, Lucas and Carter. The swarm parameter from the swarm study are expected to sever as a critical test of current theories of low energy scattering by atoms and molecules.

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