• 제목/요약/키워드: MC simulation

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A General Semiparametric Additive Risk Model

  • Park, Cheol-Yong
    • Journal of the Korean Data and Information Science Society
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    • v.19 no.2
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    • pp.421-429
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    • 2008
  • We consider a general semiparametric additive risk model that consists of three components. They are parametric, purely and smoothly nonparametric components. In parametric component, time dependent term is known up to proportional constant. In purely nonparametric component, time dependent term is an unknown function, and time dependent term in smoothly nonparametric component is an unknown but smoothly function. As an estimation method of this model, we use the weighted least square estimation by Huffer and McKeague (1991). We provide an illustrative example as well as a simulation study that compares the performance of our method with the ordinary least square method.

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A Study on Adaptive Interference Suppressor for Multicarrier DS-CDMA (멀티캐리어 DS-CDMA를 위한 적응 간섭 억제기에 관한 연구)

  • 우대호;장병건;변윤식
    • Proceedings of the IEEK Conference
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    • 2000.09a
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    • pp.25-28
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    • 2000
  • In this paper, we choice multicarrier direct-sequence code division multiple access using bandwidth effectively in communication system. Because this system is based on DS-CDMA the same problem is raised. That is, the degradation of the performance is due to multiple access interference. To solve this problem, we proposed the blind adaptive receiver for MC DS-CDMA system. Simulation results show that the proposed blind receiver has more about 0.5(dB) value of SNR than conventional receiver.

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A Study on Time Optimal Position Control of A CSI Fed Induction Motor (전류형 인버터에 의해 구동되는 유도전동기의 시간최적 위치제어에 관한 연구)

  • 박민호;원충연
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.36 no.8
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    • pp.529-538
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    • 1987
  • The time optimal position control scheme based on the Pontryagin's minimum principle is proposed in the current source inverter(CSI) fed induction motor system. The field oriented induction motor system is modelled with a second order plant and a switching curve is obtained by solving Hamiltonian equation. The validity of time optimal control solution has been verified by experimental tests carried out with a prototype MC68000 based microcomputer system, and 5Hp induction motor. Experimental results are in a close agreement with those the digital simulation ones.

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Microwave-Induced Negative-Differential Resistance Observed in Josephson Junction (마이크로파가 조셉슨 접합에서 유발하는 부의 미분저항)

  • Kim, Kyu-Tae;Koutovoi, Viatcheslav D.;Hong, Hyun-Kwon
    • 한국초전도학회:학술대회논문집
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    • v.9
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    • pp.237-237
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    • 1999
  • We have observed that a stable and reproducible Negative Differential Resistance(NDR) is induced by external microwave at low power in Nb/AlO$_x$/Al/Alo$_x$/Nb junctions. To study the erratic and pozzling NDR observations we have simulated Stewart-McCumber model in the region. Experimental results and simulation results will be presented with a discussion to draw a dynamic interpreration of the NDR.

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특징형상에 기초한 자동 가공 및 측정 시스템에 관한 연구

  • 김승철;정성종
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1992.10a
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    • pp.238-242
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    • 1992
  • Thus paper deals with a study of the automatic machining and measurement system based on Features. The system includes following 5 modules : a feature-based design module, an automatic NC programming module, an automatic measurement programming module, and a simulation module. The system is developed by using IBM-PC in the AutoCAD and the BORLAND c $\^$++/ environment. A vertical machining center equipped with FANUC 0MC is used for experiments. Performance of the system is confirmed by a large amount of experiment.

A contactless power supply for the PRT system (PRT 시스템을 위한 무접촉전력전송 시스템)

  • Rho Sung-Chan;Kim Soo-Hong;Kim Yoon-Ho
    • Proceedings of the KSR Conference
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    • 2005.05a
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    • pp.895-902
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    • 2005
  • This paper presents contactless power transfer system for an electric railway system which makes use of electromagnetic induction among the coils. A full bridge type series resonant inverter is used as a power conversion system. and MC14046 PLL of Motorola is used as a control device. Finally, presented system is verified by simulation.

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A Nonparametric Additive Risk Model Based On Splines

  • Park, Cheol-Yong
    • 한국데이터정보과학회:학술대회논문집
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    • 2006.11a
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    • pp.49-50
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    • 2006
  • We consider a nonparametric additive risk model that are based on splines. This model consists of both purely and smoothly nonparametric components. As an estimation method of this model, we use the weighted least square estimation by Huffer and McKeague (1991). We provide an illustrative example as well as a simulation study that compares the performance of our method with the ordinary least square method.

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Transmission and reception scheme for D2D communication in LTE-Advanced environment (LTE-Advanced 환경에서 D2D 통신을 위한 송수신 기법)

  • Seo, Bangwon
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.16 no.1
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    • pp.83-88
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    • 2016
  • We treat device-to-device direct communication (D2D) by reusing cellular uplink resources in LTE-Advanced systems. Conventional schemes assume that D2D transmitter employs SC-FDMA scheme for the date transmission. In the conventional schemes, however, it is very difficult to reduce the interference between the users, D2D communication cannot be used when the interference caused by cellular uplink signal is high. In this paper, we propose D2D transmission scheme which employes MC-CDMA technology and D2D detection scheme which uses MMSE algorithm to reduce interference from the cellular uplink signal. Therefore, in the proposed scheme the D2D communication becomes possible even in the high interference scenario. Through simulation, we show that the proposed scheme has better BER performance than the conventional scheme.

Effects of Carbon, Tungsten, and Vanadium on the Microstructure, High-Temperature Wear Properties, and Surface Roughness of High Speed Steel Rolls (고속도강롤의 미세조직, 고온마모특성, 표면조도에 미치는 탄소, 텅스텐, 바나듐의 영향)

  • Ha, Dae Jin;Sung, Hyo Kyung;Park, Joon Wook;Lee, Sunghak
    • Korean Journal of Metals and Materials
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    • v.47 no.7
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    • pp.406-415
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    • 2009
  • A study was conducted on the effects of carbon, tungsten, and vanadium on the wear properties and surface roughness of four High Speed Steel (HSS) rolls manufactured by the centrifugal casting method. Hot-rolling simulation tests were carried out using a high-temperature wear tester capable of controlling speed, load, and temperature. HSS rolls contained a large amount (up to 25 vol.%) of carbides such as MC, $M_{2}C$, $M_{7}C_{3}$, and $M_{6}C$ carbides formed in the tempered martensite matrix. The matrix consisted mainly of lath tempered martensite when the carbon content in the matrix was small, and contained a considerable amount of plate tempered martensite when the carbon content increased. The high-temperature wear test results indicated that the wear properties and surface roughness of the rolls improved when the amount of hard MC carbides formed inside solidification cells increased. The rolls distribution was also homogeneous. The best wear properties and surface roughness were obtained from a roll where a large amount of MC carbides was homogeneously distributed in the lath tempered martensite matrix. The proper contents of carbon equivalent, tungsten equivalent, and vanadium were 2.0~2.3%, 9~10%, and 5~6%, respectively.

A Review on Analysis of Natural Uranium Isotopes and Their Application (우라늄 동위원소의 분석과 활용에 대한 고찰)

  • Yeongmin Kim
    • Economic and Environmental Geology
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    • v.56 no.5
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    • pp.547-555
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    • 2023
  • Due to enhanced precision in uranium isotope measurements with MC-ICP-MS, there has been a surge in studies concerning the naturally occurring uranium isotope ratio (238U/235U) and its associated fractionation processes. Several researchers have highlighted that the 238U/235U ratio, previously assumed to be constant, can vary by several per mil depending on different natural fractionation processes. This review paper outlines the uranium isotope values (δ238U) for major terrestrial reservoirs and their variations. It discusses the range of δ238U values and uranium isotope fractionation seen in uranium ore deposits, based on deposit type and ore-forming conditions. In conclusion, this paper emphasizes the importance of studies on uranium ore deposits. Such deposits serve as natural simulation models vital for designing high-level radioactive waste repository sites.