Browsing by Author "Chen, Wei"

Now showing 1 - 9 of 9
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    1920-1995 Twin Cities State Highway Network
    (2014-03-21) Chen, Wei; Levinson, David M; dlevinson@umn.edu; Levinson, David M.
    Illustrates the development of the highway network in the Twin Cities metropolitan region. GIS maps of the state highway network were created for 1920-1995 (these were not previously digitized). These were used to build Markov Chain Cellular Automata models of land use change and network growth.
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    1958 Twin Cities Land Use Map from the Twin Cities Metropolitan Planning Commission, GIS Data Files
    (2013-11-22) Chen, Wei; Levinson, David M; dlevinson@umn.edu; Levinson, David M.
    High-quality GIS land use maps for the Twin Cities Metropolitan Area for 1958 that were developed from paper maps (no GIS version existed previously).
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    1968 Twin Cities Land Use Map from the Twin Cities Metropolitan Planning Commission, GIS Data Files
    (2014-03-03) Levinson, David M; Chen, Wei; dlevinson@umn.edu; Levinson, David M.
    High-quality GIS land use maps for the Twin Cities Metropolitan Area for 1968 that were developed from paper maps (no GIS version existed previously).
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    1978 Twin Cities Land Use Map from the Twin Cities Metropolitan Planning Commission, GIS Data Files
    (2014-03-03) Levinson, David M; Chen, Wei; dlevinson@umn.edu; Levinson, David M.
    High-quality GIS land use maps for the Twin Cities Metropolitan Area for 1978 that were developed from paper maps (no GIS version existed previously).
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    Area Based Models of New Highway Route Growth
    (American Society of Civil Engineers, 2007) Levinson, David M; Chen, Wei
    Empirical data and statistical models are used to answer the question of where new highway routes are most likely to be located. High-quality land-use, population distribution and highway network GIS data for the Twin CitiesMetropolitan Area from 1958 to 1990 are developed for this study. The highway system is classified into three levels, Interstate highways, divided highways, and secondary highways. Binary logit models estimate the new route growth probability of divided highways and secondary highways. Interstates, however,are not modeled here and are used as a predictor in modeling the growth of divided highways and secondary highways. The results show that the area's land-use attributes and population density level do have significant relationship with the area's likelihood of adding new highway routes.
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    Design of forwarder list selection scheme in opportunistic routing protocol
    (2008-10-22) Li, Yanhua; Chen, Wei; Zhang, Zhi-Li
    Unlike traditional wireless routing protocols which use a single fixed path, opportunistic routing explicitly takes advantage of the broadcast nature of wireless communications by using a set of forwarders to opportunistically perform packet forwarding. A key issue in the design of opportunistic routing protocols is the forwarder list selection problem. In this paper we establish a general theory for analyzing the forwarder list selection problem, and develop an optimal solution, the minimum transmission selection(MTS) algorithm, which minimizes the expected number of transmissions. Through extensive simulations using the MIT Roofnet dataset, we demonstrate that in more than 90% cases the MTS algorithm outperforms the forwarder selection scheme used in ExOR, the best known opportunistic routing protocol in the literature.
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    If They Come, Will You Build It? Urban Transportation Network Growth Models
    (2003-09-01) Levinson, David M; Karamalaputi, Ramachandra; Chen, Wei
    This research applies a holistic, integrated approach to transportation planning for the Twin Cities metro area. The author studies the causes and implications of the prevalent method of accommodating growth (building in response to demand) as it applies to node formation, link formation and link expansion. Using data spanning two decades, the author has developed scientifically based models for projection and planning that address network investment, utilization and capacity. The authors lend an intriguing perspective to the concept of transportation expansion in an urban setting. Throughout the analysis, they propose (and support) the perspective of the Twin Cities highway system as a dynamic organism, capable of affecting and responding to change. Their models will serve as valuable tools to those interested in planning in a way that best serves current and future transportation demands.
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    Paving New Ground
    (Elsevier, 2005) Levinson, David M; Chen, Wei
    This paper explores the inter-connectedness and co-evolution of transportation networks and land use through the application of a Markov Chain model to the Twin Cities from 1958 through 1990. This model investigates how individual cells, with both land use and transportation network attributes, change over time. Cells with more transportation network available are more likely to develop, and cells that are developed are more likely to attract additional highway investment.
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    Traffic Management Systems
    (Kluwer Academic Publishers, 2004) Levinson, David M; Chen, Wei
    This study uses regression analysis to evaluate long-run traffic management system performance. Three important traffic management systems in the Twin Cities metro area - Ramp Metering, Variable Message Signs (VMS), and Freeway Service Patrol (the Highway Helper Program) were evaluated with multiple regression models to predict link speed and incident rate. We find that ramp meters increase freeway link speed and reduce incident rate. Freeway Service Patrols increase link speed when incidents are present. The results for variable message signs are ambiguous.