In this paper, applications of Markovian transition probability model to decision of optimal maintenance strategy of flexible pavements on network basis are discussed.The optimal maintenance strategy at the project level is formulated based on both dynamic progrmming and the equivalent annual maintenance cost. These two methods give the exactly same optimal maintenance level for the minimum long-run expected average cost.Introducing the concept of repaired ratio, the optimal strategy at the network level is formulated as budget allocation problem by expansion of the equivalent annual maintenance cost model at the project level.

Optimal maintenance

Optimal allocation

Basis (linear algebra)

10.2208/journalpe.1.175

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Tracking Algorithm for Microscopic Flow Data Collection

arXiv (Cornell University) (2016)

Kardi Teknomo Yasushi Takeyama Hajime Inamura

Various methods to automate traffic data collection have recently been developed by many researchers. A macroscopic data collection through image processing has been proposed. For microscopic traffic flow data, such as individual speed and time or distance headway, tracking of individual movement is needed. The tracking algorithms for pedestrian or vehicle have been developed to trace the movement of one or two pedestrians based on sign pattern, and feature detection. No research has been done to track many pedestrians or vehicles at once. This paper describes a new and fast algorithm to track the movement of many individual vehicles or pedestrians

Headway

Tracking (education)

TRACE (psycholinguistics)

Feature (linguistics)

10.48550/arxiv.1609.02137

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STRESS EQUATION OF EXPANSION JOINT EDGE OF CONCRETE PAVEMENT SLAB BASED ON FEM ANALYSIS

Doboku Gakkai Ronbunshu (1990)

Seiji Komatsu Yasushi Takeyama Tadashi Fukuda

The authors developed a stress equation of expansion joint edge of concrete pavement slab based on stress analysis by finite element method (FEM). In this FEM analysis, concrete pavement and its expansion joint were expressed by means of a thin plate-Winkler foundation model and a shear spring model respectively. The elastic constant of the shear spring model was determined experimentally by loading test at a full scale concrete pavement. Multi-regression analysis was applied to the results of the FEM numerical calculation, and consequently, a stress equation was obtained. After the comparison between the calculated results of the equation and experimental results, it was proved that the equation was valid and practical.

Slab

10.2208/jscej.1990.414_221

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AN EVALUATION SYSTEM FOR MANAGING ASPHALT PAVEMENTS BASED ON MARKOV CHAIN MODEL

Doboku Gakkai Ronbunshu (1990)

Yasushi Takeyama Yoichi Shimada Tadashi Fukuda

The object of this study is to develop an evaluation system for managing asphalt pavements based on Markov chain model. Deterioration process, reliability, effects of rehabilitation, and steady state probability of asphalt pavements can be evaluated by this system. In this paper, the Markov chain model methodology is explained, and the application of this system to actual asphalt pavements in Tohdku district is described. As the results, transition matrices for asphalt pavement performance are obtained, and the effects of rehabilitation are estimated quantitatively by this system.

Asphalt pavement

Continuous-time Markov chain

10.2208/jscej.1990.420_135

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MICROSCOPIC PEDESTRIAN SIMULATION MODEL TO EVALUATE "LANE-LIKE SEGREGATION" OF PEDESTRIAN CROSSING

Kardi Teknomo Yasushi Takeyama Hajime Inamura

One of the objectives of the pedestrian analysis is to evaluate the effects of proposed policy on the pedestrian facilities before its implementation. The implementation of a policy without pedestrian analysis might lead to a very costly trial and error due to the implementation cost. On the other hand, using good analysis tools, the trail and error of policy could be done in the analysis level. Once the analysis could prove a good performance, the implementation of the policy is straightforward.

Error Analysis

Pedestrian crossing

Source

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Environmental impact assessment of exhaust emissions in consideration of network traffic flow.

ENVIRONMENTAL SYSTEMS RESEARCH (1992)

Yasushi Takeyama

In present environmental impact assessment method of exhaust emissions, only the concentration of emissions beside objective road are assessed. But in such cases, network traffic flows are affected by construction of a new road. In this study, a vehicular emission model is developed to evaluate the emission factors of diesel vehicles even in congested traffic flow. The time-velocity profiles in urban area are modeled by using unit velocity profile. And applications of these models to network traffic flow are described.

10.2208/proer1988.20.200

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LONGITUDINAL VENTILATION MODEL FOR ONE-WAY TRAFFIC TUNNEL OF CONCENTRATED EXHAUST TYPE

PROCEEDINGS OF TUNNEL ENGINEERING, JSCE (1992)

Kouji Mitsukuri Yasushi Takeyama

10.11532/journalte1991.2.113

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MODELLING OF TRANSIENT PERFORMANCE OF CRACKING INDEX OF CONCRETE PAVEMENT SLAB

Doboku Gakkai Ronbunshu (1991)

Yasushi Takeyama Tadashi Fukuda J. Rafael MONTAÑO M.

Transient performance of the cracking damage of concrete pavement slab was modelled by means of the statistical analysis of the results of the condition survey of pavement surfaces. In the modelling, a double exponential function was applied to the formation of the cumulative distribution function of the annual increment of the cracking index. The validity of the model was verified statistically by the goodness-of-fit test between the surveyed cumulative frequency and the calculated distribution by the model. Reliability of concrete pavement against the cracking damage can be evaluated by this model.

Slab

Goodness of fit

10.2208/jscej.1991.426_177

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