• 제목/요약/키워드: position probability

검색결과 292건 처리시간 0.026초

무인잠수정 센서 선정을 위한 복합항법 성능 분석 (Analysis of Integrated Navigation Performance for Sensor Selection of Unmanned Underwater Vehicle (UUV))

  • 유태석;김문환
    • 한국해양공학회지
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    • 제28권6호
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    • pp.566-573
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    • 2014
  • This paper presents the results of an integrated navigation performance analysis for selecting the sensor of an unmanned underwater vehicle (UUV) using Monte Carlo numerical simulation. An inertial measurement unit (IMU) and Doppler velocity log (DVL) are considered to build the integrated navigation system. The position error and price of the sensor are selected as performance indices to evaluate the volunteer integrated navigation systems. Monte-Carlo simulation is introduced to analyze the circular error probability (CEP) and its variance. Simulation results provide the proper sensor combination for integrated navigation in relation to the performance and price.

유도된 이진난수 생성법을 이용한 uDEAS의 Multi-start 성능 개선 (Performance Improvement of Multi-Start in uDEAS Using Guided Random Bit Generation)

  • 김은숙;김만석;김종욱
    • 전기학회논문지
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    • 제58권4호
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    • pp.840-848
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    • 2009
  • This paper proposes a new multi-start scheme that generates guided random bits in selecting initial search points for global optimization with univariate dynamic encoding algorithm for searches (uDEAS). The proposed method counts the number of 1 in each bit position from all the previously generated initial search matrices and, based on this information, generates 0 in proportion with the probability of selecting 1. This rule is simple and effective for improving diversity of initial search points. The performance improvement of the proposed multi-start is validated through implementation in uDEAS and function optimization experiments.

AWGN 채널에서 M진 임펄스 통신의 성능 분석 (Performance of M-ary Impulse Communications System over AWGN Channels)

  • 김동호;백승선;문용규;강희조
    • 한국정보통신학회논문지
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    • 제6권3호
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    • pp.405-409
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    • 2002
  • 최근 FCC 위원회에서는 제안적으로 UWB의 사용을 승인하였으며 기존의 UWB 기술을 보완하며 이 기술로 응용 가능한 표준안을 발표할 계획이다. 본 논문에서는 AWGN 채널에서 BCH를 채용시 M-ary 값이 변화함에 따른 UWB 통신 시스템의 성능을 비교하였다. 또한 UWB 변조방식으로 고려되어 오던 M-ary PAM과 PPM의 방식을 M-ary 수를 변화시킴에 따라 에러 확률을 비교 분석하였다.

Analytical and experimental fatigue analysis of wind turbine tower connection bolts

  • Ajaei, Behrouz Badrkhani;Soyoz, Serdar
    • Wind and Structures
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    • 제31권1호
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    • pp.1-14
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    • 2020
  • This paper presents a method of estimation of fatigue demands on connection bolts of tubular steel wind turbine towers. The presented method relies on numerical simulation of aerodynamic loads and structural behavior of bolted connections modeled using finite element method. Variability of wind parameters is represented by a set of values derived from their probability densities, which are adjusted based on field measurements. Numerically generated stress time-series show agreement with the measurements from strain gauges inside bolts, in terms of power spectra and the resulting damage. Position of each bolt has a determining effect on its fatigue damage. The proposed framework for fatigue life estimation represents the complexities in loading and local behavior of the structure. On the other hand, the developed procedure is computationally efficient since it requires a limited number of simulations for statistically representing the wind variations.

LAW OF LARGE NUMBERS FOR BRANCHING BROWNIAN MOTION

  • Kang, Hye-Jeong
    • 대한수학회지
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    • 제36권1호
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    • pp.139-157
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    • 1999
  • Consider a supercritical Bellman-Harris process evolving from one particle. We superimpose on this process the additional structure of movement. A particle whose parent was at x at its time of birth moves until it dies according to a given Markov process X starting at x. The motions of different particles are assumed independent. In this paper we show that when the movement process X is standard Brownian the proportion of particles with position $\leq${{{{ SQRT { t} }}}} b and age$\leq$a tends with probability 1 to A(a)$\Phi$(b) where A(.) and $\Phi$(.) are the stable age distribution and standard normal distribution, respectively. We also extend this result to the case when the movement process is a Levy process.

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Mitigation Techniques of Channel Collisions in the TTFR-Based Asynchronous Spectral Phase-Encoded Optical CDMA System

  • Miyazawa, Takaya;Sasase, Iwao
    • Journal of Communications and Networks
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    • 제11권1호
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    • pp.1-10
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    • 2009
  • In this paper, we propose a chip-level detection and a spectral-slice scheme for the tunable-transmitter/fixed-receiver (TTFR)-based asynchronous spectral phase-encoded optical codedivision multiple-access (CDMA) system combined with timeencoding. The chip-level detection can enhance the tolerance of multiple access interference (MAI) because the channel collision does not occur as long as there is at least one weighted position without MAI. Moreover, the spectral-slice scheme can reduce the interference probability because the MAI with the different frequency has no adverse effects on the channel collision rate. As a result, these techniques mitigate channel collisions. We analyze the channel collision rate theoretically, and show that the proposed system can achieve a lower channel collision rate in comparison to both conventional systems with and without the time-encoding method.

마코프 모델 기반 적응적 중심블록을 이용한 불완전한 지문의 분류 성능 향상에 관한 연구 (A Study on the Performance Improvement of Incomplete Fingerprint Classification using an Adaptive Core Block Based on Markov Models)

  • 정혜욱;이지형
    • 제어로봇시스템학회논문지
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    • 제18권11호
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    • pp.1005-1010
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    • 2012
  • We propose a novel approach to classify fingerprints using the extracted adaptive core block for improving classification performance of incomplete fingerprints in this paper. We compute representative directions from fingerprint images by the block unit and learn horizontal and vertical Markov models by deciding the center position of a fingerprint image based on the expert knowledge. The center block of a test image is the block has the highest probability after comparing the Markov model with $11{\times}11$ blocks. The proposed approach can effectively classify incomplete fingerprints using the optimal center block.

장방형주 후류의 2차원 난류특성 (The Characteristics of Two-Dimensional Turbulent Wake Flow Past a Rectangular Cylinder)

  • 남청도;조석호;부정숙
    • Journal of Advanced Marine Engineering and Technology
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    • 제14권1호
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    • pp.62-71
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    • 1990
  • Two-dimensional turbulent wake flow past a rectangular cylinder is investigated experimentally by using the linearized constant temperature hot-wire anemometer. Some of turbulent characteristics are obtained at the range of X=6B-500B downstream from the cylinder and the Reynolds number range is 500-2800. For the statistical treatment, autocorrelation coefficient, probability density function and power spectral density function are obtained by using the signal analyzer. It is clear that coherent structure of strong periodic eddies exists to the position of 20B downstream from the cylinder, and its feature is similar to round type as nearer to the cylinder while it is stretched longitudinally along with flow direction as the distance from the cylinder is increased to downstream.

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가우시안 모노펄스를 이용하는 M-ary PPM 초광대역 다중접속시스템의 성능해석 (Performance Analysis of M-ayy PPM Ultra-wideband Multiple Access Systems Using Gaussian Monopulse)

  • 곽재민;이성철;조삼구;조성준
    • 한국전자파학회:학술대회논문집
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    • 한국전자파학회 2003년도 종합학술발표회 논문집 Vol.13 No.1
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    • pp.229-233
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    • 2003
  • In this paper we theoretically analyze the probability of error for M-ary pulse position modulation (PPM) ultra-wideband (UWB) multiple access system using Gaussian monopulse. The optimum detection of UWB signals using M-ary orthogonal PPM in additive white Gaussian noise (AWGN) and multiple access interference (MAI) is considered, then receiver signal to noise power ratio (SNR) and upper bound fur the bit error rate (BER) are derived. Numerical results considering some practical parameters are presented.

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벌크 입력과 서비스를 고려한 ATM망에서 호 수락 제어에 관한 성능 분석 (Performance analysis of call admission control in ATM networks considering bulk arrivals services)

  • 서순석;박광채
    • 한국통신학회논문지
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    • 제21권3호
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    • pp.675-683
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    • 1996
  • CAC, UPC, NPC, cell level QoS and congestion control is required to assign efficiently channels's BW and to prevent networks from congestion. In the CAC algorithm, each user defines characteristics of input traffic when channels are set up and network based on this parameters determines the acception or rejection of the required BW. The CAC control mechanism is classified into the centralized BW allocation mechanism and the distributed BW Allocation mechanism according to the function and position of CAC processor allocating BW. In this paper, in contrast with esisted the distributed BW allocation mechanism which assumes the required BW of input traffic as constant, we assume input traffic & serices as bulk probability distribution in order to analyze performance more precisely.

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