• Title/Summary/Keyword: 대기 행렬 모형

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Research on The Modeling of Appropriate Parking Space for Mass Traffic Generating Facilities (대량 교통유발시설의 적정주차 추정모형구축에 관한 연구)

  • 오윤표;장무렬
    • Journal of Korean Society of Transportation
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    • v.19 no.3
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    • pp.61-73
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    • 2001
  • The purpose of this study is to simulate the suitable space of parking lots for Mass traffic instigating facilities in Pusan. After the suitable scale of parking lots estimate using GPSS, one of the Queue Simulation, with the average arriving time and the average parking time at parking lots, the formula is simulated by the Regression model to relate a total floor area and the suitable number of parking lots. The improved criteria or present parking lots is needed to prevent the unnecessary vehicles and improve the efficiency of land use. The suitable scale of parking lots estimate just with the state of using the parking lots in this study. but it is necessary to consider land use, traffic condition, commercial area etc.

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D-MAP 도착과정을 갖는 이산시간 대기행렬모형에서의 분포적 Little의 법칙과 D-MAP/D/c 모형에의 응용

  • Kim Nam-Gi
    • Proceedings of the Korean Operations and Management Science Society Conference
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    • 2006.05a
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    • pp.1101-1103
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    • 2006
  • For a broad class of discrete-time FIFO queueing systems with D-MAP (discrete-time Markovian arrival process) arrivals, we present a distributional Little's law that relates the distribution of the stationary number of customers in system (queue) with that of the stationary number of slots a customer spends in system (queue). Taking the multi-server D-MAP/D/c queue for example, we illustrate how to utilize this relation to get the desired distribution of the number of customers.

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Mean Value Analysis of a re-entrant line with production loss (생산 손실이 발생하는 재진입 라인의 평균치 분석)

  • 박영신;김수영;전치혁
    • Proceedings of the Korean Operations and Management Science Society Conference
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    • 2000.04a
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    • pp.265-267
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    • 2000
  • 가공물을 한 개씩 작업하는 단일작업기계와 여러 개의 가공물을 한꺼번에 작업하는 배치 기계를 포함한 재진입 라인 시스템에서 각 기계가 고장이 일어날 수 있고, 불량품이 발생할 때, 이 시스템에서의 가공물의 생산주기를 구하는 방법을 Mean Value Analysis(MVA)를 이용하여 제시하고자 한다. 배치 기계와 고장 발생, 불량품 발생 등의 이유의 이런 시스템은 승법형 대기행렬 모형으로 모형화 할 수 없다. 본 논문에서는 각 기계에서의 체류 시간을 구하여 전 시스템의 생산 주기를 구하는 방법을 MVA 를 이용하여 제시한다.

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A Variable Speed Limits Operation Model to Minimize Confliction at a Bottleneck Section by Cumulative Demand-Capacity Analysis (대기행렬이론을 이용한 병목지점 충돌위험 저감 가변속도제어 운영모형)

  • LEE, Junhyung;SON, Bongsoo
    • Journal of Korean Society of Transportation
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    • v.33 no.5
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    • pp.478-487
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    • 2015
  • This study proposed a Variable Speed Limits(VSL) algorithm to use traffic information based on Cumulative Demand-Capacity Analysis and evaluated its performance. According to the analysis result, the total of delay consisted of 3 separate parts. There was no change in total travel time although the total of delay decreased. These effects was analysed theoretically and then, evaluated through VISSIM, a microscopic simulator. VISSIM simulation results show almost same as those of theoretical analysis. Furthermore in SSAM analysis with VISSIM simulation log, the number of high risk collisions decreased 36.0 %. However, the total delay decrease effect is not real meaning of decrease effect because the drivers' desired speed is same whether the VSL model is operated or not. Nevertheless this VSL model maintains free flow speed for longer and increases the cycle of traffic speed fluctuation. In other words, this is decrease of delay occurrence and scale. The decrease of speed gap between upstream and downstream stabilizes the traffic flow and leads decrease number of high risk collision. In conclusion, we can expect increase of safety through total delay minimization according to this VSL model.

Determination of the Required Minimum Spacing between Signalized Intersections and Bus-Bays (신호교차로와 버스정류장간 이격거리 산정에 관한 연구)

  • 하태준;박제진;임혜영
    • Journal of Korean Society of Transportation
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    • v.20 no.4
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    • pp.73-82
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    • 2002
  • The influence of bus stops near signalized intersections is one of the important factors which cannot be negligible in the analysis of the capacity of signalized intersections. Absence of consideration of bus bay can reduce capacity and increase the time that the stop of buses block other traveling vehicles. This influence is reflected by the bus blockage adjustment factor in KHCM, but the factor does not consider the course of each bus passing the intersection. Particularly, left turn buses have more influence on the capacity than the other buses and require the minimum length of the road for lane changes. All the existing criteria can apply only to arterial roads on which mostly traffic flows are continuous. And the criteria. which can determine the optimum location and the minimum distance between a signalized intersection and a bus bay, is not prepared and the related study is insufficient. Therefore, a theoretical formula is derived in this study being based on the theories which are avaliable to apply to the situation of signalized intersections.

Modelling En-route Diversion Behavior under On-site Traffic Information (관측 교통정보를 이용한 통행중 경로전환행태 모형)

  • Kim, Hye-Ran;Chon, Kyung-Soo;Park, Chang-Ho
    • Journal of Korean Society of Transportation
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    • v.22 no.3 s.74
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    • pp.137-144
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    • 2004
  • The real-time traffic information is considered to be the system to alleviate traffic congestion. An effective traffic information will help drivers make efficient travel decision, and network performance will be improved. To make efficient strategy of providing information, the analyst should quantify reduced congestion by the media traffic informations. Many other route diversion models considered only media-informations as information sources and ignored the impact of on-site informations such as visible delays and average speeds, which affect drivers' route diversion decision in practice. In those models, the effect of on-site informations could be treated to be the effect of media informations, and the effects of media informations would be over-estimated. The proposed model including the impact of on-site information can estimate the effect of media-informations. The results are expected to be applied to the analysis of traffic management policy such as ITS.

A Design Methodology for Signalized Intersection Delay Systems (신호교차로 지체체계 분석방법론 연구)

  • 하동익
    • Journal of Korean Society of Transportation
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    • v.15 no.2
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    • pp.83-103
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    • 1997
  • 교차로 지체를 추정하기 위해서는 대기행렬 모형이 적합한데 모든 대기시스템은 시 간의 함수로 운영되므로 우리는 분석하고자 하는 시스템이 가변상태인지 또는 안정상태인지 를 먼저 결정하여야 한다. 신호화된 교차로에 유입·유출되는 특히 유입교통량은 시간대별 변화가 심하다. 미국 HCM에서는 이를 15분 단위로 분석하도록 제안하였으나 신호교차로 체계의 정밀 분석을 위해서는 만족스럽지 못한 시간단위이다. 이러한 문제점을 극복하기 위 해서는 시스템이 안정상태가 아닌 가정으로 접근하여야 하며, 더 나아가 Dynamic한 분석이 요구된다. 안정상태의 지체는 Webster를 비롯한 여러 학자들에 의해 광범위하게 연구되어 왔다. 그러나 그들이 갖는 가정은 일반적으로 비현실적이어서 정밀한 지체추정은 실제로 가 능하지 않다. 안정상태 가정하에서 해법의 결점은 도착교통량이 용량에 다다를수록 더욱 심 하게 되어 비현실적인 지체예측을 하게 된다. 본 논문은 기존 분석방법론의 제반 한계성과 제약성을 검토하고 현실적인 교차로 지체모형을 개발하기 위해 고려되어져햐 할 변수들을 정립하고자 한다.

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Comparison of Delay Estimates for Signalized Intersection (신호교차로 지체 산정 비교)

  • Jo, Jun-Han;Jo, Yong-Chan;Kim, Seong-Ho
    • Journal of Korean Society of Transportation
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    • v.23 no.1
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    • pp.67-80
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    • 2005
  • In this paper, the primary objective of the research are to review the methods currently avaliable for estimating the delay incurred by vehicles at signalized intersections. The paper compares the delay estimates from a deterministic queueing model, a model based on shock wave theory , the steady-state Webster model, the queue-based models defined in the 1994 and 2001 version of the High way Capacity Manual, in addition to the delays estimated from the TRANSYT-7F macroscopic simulation and NETSIM microscopic simulation. More especially, this paper is to compare the delay estimates obtained using macroscopic and microscopic simulation tools against state-of-the practice analytical models that are derived from deterministic queueing and shock wave analysis theory. The results of the comparisons indicate that all delay models produce relatively similar results for signalized intersections with low traffic demand, but that increasing differences occur as the traffic demand approaches saturation. In particular, when the TRANSYT-7F and NETSIM are compared, it is highly differences as approach for traffic condition to over-saturation. Also, the NETSIM microscopic simulation is the lowest estimates among the various models.

Empirical Evaluation of BIM Coordinator Performance using Queuing Model in Construction Phase (대기행렬 모형을 활용한 시공단계 BIM 코디네이터 업무 성과 분석)

  • Ham, Nam-Hyuk;Yuh, Ok-Kyung;Ji, Kyu-Hyun
    • Journal of KIBIM
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    • v.8 no.3
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    • pp.31-42
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    • 2018
  • This study focuses on the BIM request for information(RFI) processing performance and quantitatively analyzes the performance of the BIM coordinator and the loss due to the waiting of the project participants. For these purposes, a method to quantitatively evaluate the performance of the BIM coordinator was proposed using a queueing model. For the verification, two projects in which BIM was applied in the construction phase were selected, and the BIM RFI data were collected through the analysis of the BIM monthly report and BIM coordinator work log of each project. In addition, the BIM input personnel, labor cost, and productivity data were collected through interviews with the experts of the case projects. The analysis of the BIM RFI processing performance of the BIM coordinator using the queueing model exhibited on a probabilistic basis that the waiting status of the project participants could vary depending on the preliminary BIM application to the design verification as well as the input number and level of the BIM coordinator personnel. In addition, the loss cost due to the waiting of the project participants was analyzed using the number of BIM RFIs waiting to be processed in the queueing system. Finally, the economic feasibility analysis for the optimal BIM coordinator input was performed considering the loss cost. The results of this study can be used to make decisions about the optimal BIM coordinator input and can provide grounds for the BIM return on investment (ROI) analysis considering the waiting cost of the project participants.

Asymptotic distribution of estimator in INAR(1) process with negative binomial marginal (주변분포가 음이항 분포를 따르는 INAR(1)모형에서 추정량의 점근분포)

  • 김희영;박유성
    • The Korean Journal of Applied Statistics
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    • v.9 no.1
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    • pp.111-124
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    • 1996
  • In this paper, we consider the first-order integer valued autoregressive(INAR(1)) model where correlation structure is similar to that of the continuous valued AR(1) process. Several methods for estimating the parameters of the INAR(1) process with negative binomial marginal are discussed. We derive asymptotic distributions of these estimators. The results of a simulation study for these estimators methods show that the estimator which we present in this paper is better than the estimator which Klimko and Nelson(1978) presented. As an application we considered the estimator of M/M/1 queue length.

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