Paul Schonfeld | University of Maryland, College Park (original) (raw)

Papers by Paul Schonfeld

Research paper thumbnail of Pavement Resurfacing Intervals in Work Zone Optimization

Transportation Research Board 86th Annual MeetingTransportation Research Board, 2007

Research paper thumbnail of Effects of Driverless Vehicles on Competitiveness of Bus Transit Services

Journal of transportation engineering, Apr 1, 2020

Research paper thumbnail of Railway Alignment Optimization in Mountainous Regions Considering Spatial Geological Hazards: A Sustainable Safety Perspective

Sustainability, Feb 4, 2021

Research paper thumbnail of Combined Cost of Highway Maintenance and Traffic Operations

... HTTP: LANGUAGE: English. PUB ID: 103-159-625 (Last edited on 2002/02/27 18:35:30 US/Mountain)... more ... HTTP: LANGUAGE: English. PUB ID: 103-159-625 (Last edited on 2002/02/27 18:35:30 US/Mountain). SPONSOR(S): ABSTRACT: Cover title. "Authors: Chien-Hung Wei, PaulSchonfeld"--Tech. rept. tp "AW092-348-046 final report.". "December 1992.". ...

Research paper thumbnail of Improved Methods for Operating Public Transportation Services

Research paper thumbnail of Model for Optimizing Runway Location and Orientation

Transportation Research Board 94th Annual MeetingTransportation Research Board, 2015

The design of an airport runway that only aims to satisfy the most basic requirements is quite ch... more The design of an airport runway that only aims to satisfy the most basic requirements is quite challenging, and optimizing the design is even more difficult. The conventional runway location and orientation design process relies on trial-and-error. It is laborious and usually suboptimal. Thus a mathematical model can help reduce the design time and improve the design quality. This paper proposes a model that optimizes the runway location and orientation. Various factors are considered in the model, such as obstructions clearance, winds, earthwork and the areas for facility and taxiway constructions. In addition, this model incorporates a linear programming model for calculating earthwork transportation cost in detail. A case study is presented to demonstrate the effectiveness of the proposed model.

Research paper thumbnail of Simulation and Optimization of Traffic Flow on Intercity Networks

Abstract: A macroscopic Traffic Simulation and Optimization (TSAO) model has been developed for r... more Abstract: A macroscopic Traffic Simulation and Optimization (TSAO) model has been developed for regional highway networks. In its latest version, this model uses a macroscopic research approach to simulate vehicle platoons through the network, ...

Research paper thumbnail of Investment timing and length choice for a rail transit line under demand uncertainty

Transportation Research Part B-methodological, Sep 1, 2023

Research paper thumbnail of Realizing a Quick Partial BIM Update of Subgrade in Railway Stations

Journal of the Construction Division and Management, Sep 1, 2023

Research paper thumbnail of A machine learning and simulation-based dynamic parking choice model for airports

Journal of Air Transport Management, Aug 1, 2023

Research paper thumbnail of Sequencing interdependent disruption recovery projects: Exact solution via network flow reformulation

Transportation Research Part D-transport and Environment, Feb 1, 2023

Research paper thumbnail of The controllability of China’s high-speed rail network in terms of delivering emergency supplies

Physica D: Nonlinear Phenomena, Nov 1, 2022

Research paper thumbnail of Response to discussion on “Simultaneous Optimization of 3‐D Alignments and Station Locations for Dedicated High‐Speed Railways,” <i>Computer‐Aided Civil and Infrastructure Engineering</i> , 37:4, March 2022

Computer-aided Civil and Infrastructure Engineering, Mar 1, 2022

Railway design is very complex and must be accomplished through a series of stages, including the... more Railway design is very complex and must be accomplished through a series of stages, including the “network and line planning,” “major design standards determination,” and “railway alignment design,” as shown in Figure 1. Different stages deal with different major concerns and need different simplifying assumptions regarding the real-world problem. The results of each stage are used as inputs for the next. For example, the node and link results from the network and line planning process are used for determining the major design standards such as railway grade and station spacing limits, which are then used for detailed

Research paper thumbnail of Efficiency and Reliability in Freight Transportation Systems

Research paper thumbnail of Safe Accommodation of Bicyclists on High-Speed Roadways in Maryland

Research paper thumbnail of Management of Recreational Traffic on Maryland's Eastern Shore

Research paper thumbnail of Nonstationary Markov Chain Framework for Optimizing Dedicated Check-In Service

Transportation Research Board 91st Annual MeetingTransportation Research Board, 2012

Abstract: The arrivals of passengers at airport check-in counters represent a random process with... more Abstract: The arrivals of passengers at airport check-in counters represent a random process with variable arrival rates over time. Since the arrivals generally tend to occur at higher rates close to the beginning and end of the scheduled check-in, it is worth determining when ...

Research paper thumbnail of Performance Metamodels for Dial-a-Ride Services with Time Constraints

Transportation Research Board 90th Annual MeetingTransportation Research Board, 2011

Abstract: Explicit performance models of a transit system are often very useful for system design... more Abstract: Explicit performance models of a transit system are often very useful for system design, optimization, alternative comparison, and gaining insights into relevant system relations. In this paper, three performance metamodels have been developed for many-to-...

Research paper thumbnail of A Review of Alignment Optimization Research for Roads, Railways and Rail Transit Lines

IEEE Transactions on Intelligent Transportation Systems, May 1, 2023

Research paper thumbnail of A bi-objective deep reinforcement learning approach for low-carbon-emission high-speed railway alignment design

Transportation Research Part C-emerging Technologies, Feb 1, 2023

Research paper thumbnail of Pavement Resurfacing Intervals in Work Zone Optimization

Transportation Research Board 86th Annual MeetingTransportation Research Board, 2007

Research paper thumbnail of Effects of Driverless Vehicles on Competitiveness of Bus Transit Services

Journal of transportation engineering, Apr 1, 2020

Research paper thumbnail of Railway Alignment Optimization in Mountainous Regions Considering Spatial Geological Hazards: A Sustainable Safety Perspective

Sustainability, Feb 4, 2021

Research paper thumbnail of Combined Cost of Highway Maintenance and Traffic Operations

... HTTP: LANGUAGE: English. PUB ID: 103-159-625 (Last edited on 2002/02/27 18:35:30 US/Mountain)... more ... HTTP: LANGUAGE: English. PUB ID: 103-159-625 (Last edited on 2002/02/27 18:35:30 US/Mountain). SPONSOR(S): ABSTRACT: Cover title. &quot;Authors: Chien-Hung Wei, PaulSchonfeld&quot;--Tech. rept. tp &quot;AW092-348-046 final report.&quot;. &quot;December 1992.&quot;. ...

Research paper thumbnail of Improved Methods for Operating Public Transportation Services

Research paper thumbnail of Model for Optimizing Runway Location and Orientation

Transportation Research Board 94th Annual MeetingTransportation Research Board, 2015

The design of an airport runway that only aims to satisfy the most basic requirements is quite ch... more The design of an airport runway that only aims to satisfy the most basic requirements is quite challenging, and optimizing the design is even more difficult. The conventional runway location and orientation design process relies on trial-and-error. It is laborious and usually suboptimal. Thus a mathematical model can help reduce the design time and improve the design quality. This paper proposes a model that optimizes the runway location and orientation. Various factors are considered in the model, such as obstructions clearance, winds, earthwork and the areas for facility and taxiway constructions. In addition, this model incorporates a linear programming model for calculating earthwork transportation cost in detail. A case study is presented to demonstrate the effectiveness of the proposed model.

Research paper thumbnail of Simulation and Optimization of Traffic Flow on Intercity Networks

Abstract: A macroscopic Traffic Simulation and Optimization (TSAO) model has been developed for r... more Abstract: A macroscopic Traffic Simulation and Optimization (TSAO) model has been developed for regional highway networks. In its latest version, this model uses a macroscopic research approach to simulate vehicle platoons through the network, ...

Research paper thumbnail of Investment timing and length choice for a rail transit line under demand uncertainty

Transportation Research Part B-methodological, Sep 1, 2023

Research paper thumbnail of Realizing a Quick Partial BIM Update of Subgrade in Railway Stations

Journal of the Construction Division and Management, Sep 1, 2023

Research paper thumbnail of A machine learning and simulation-based dynamic parking choice model for airports

Journal of Air Transport Management, Aug 1, 2023

Research paper thumbnail of Sequencing interdependent disruption recovery projects: Exact solution via network flow reformulation

Transportation Research Part D-transport and Environment, Feb 1, 2023

Research paper thumbnail of The controllability of China’s high-speed rail network in terms of delivering emergency supplies

Physica D: Nonlinear Phenomena, Nov 1, 2022

Research paper thumbnail of Response to discussion on “Simultaneous Optimization of 3‐D Alignments and Station Locations for Dedicated High‐Speed Railways,” <i>Computer‐Aided Civil and Infrastructure Engineering</i> , 37:4, March 2022

Computer-aided Civil and Infrastructure Engineering, Mar 1, 2022

Railway design is very complex and must be accomplished through a series of stages, including the... more Railway design is very complex and must be accomplished through a series of stages, including the “network and line planning,” “major design standards determination,” and “railway alignment design,” as shown in Figure 1. Different stages deal with different major concerns and need different simplifying assumptions regarding the real-world problem. The results of each stage are used as inputs for the next. For example, the node and link results from the network and line planning process are used for determining the major design standards such as railway grade and station spacing limits, which are then used for detailed

Research paper thumbnail of Efficiency and Reliability in Freight Transportation Systems

Research paper thumbnail of Safe Accommodation of Bicyclists on High-Speed Roadways in Maryland

Research paper thumbnail of Management of Recreational Traffic on Maryland's Eastern Shore

Research paper thumbnail of Nonstationary Markov Chain Framework for Optimizing Dedicated Check-In Service

Transportation Research Board 91st Annual MeetingTransportation Research Board, 2012

Abstract: The arrivals of passengers at airport check-in counters represent a random process with... more Abstract: The arrivals of passengers at airport check-in counters represent a random process with variable arrival rates over time. Since the arrivals generally tend to occur at higher rates close to the beginning and end of the scheduled check-in, it is worth determining when ...

Research paper thumbnail of Performance Metamodels for Dial-a-Ride Services with Time Constraints

Transportation Research Board 90th Annual MeetingTransportation Research Board, 2011

Abstract: Explicit performance models of a transit system are often very useful for system design... more Abstract: Explicit performance models of a transit system are often very useful for system design, optimization, alternative comparison, and gaining insights into relevant system relations. In this paper, three performance metamodels have been developed for many-to-...

Research paper thumbnail of A Review of Alignment Optimization Research for Roads, Railways and Rail Transit Lines

IEEE Transactions on Intelligent Transportation Systems, May 1, 2023

Research paper thumbnail of A bi-objective deep reinforcement learning approach for low-carbon-emission high-speed railway alignment design

Transportation Research Part C-emerging Technologies, Feb 1, 2023

Research paper thumbnail of Real Options Switching Strategies in Dynamic Transport Service Operations

Premise  Need for policies to inform "when to switch" between two operational regimes:  Automat... more Premise  Need for policies to inform "when to switch" between two operational regimes:  Automation  Shared autonomous vehicle operations  Dynamic tolls/pricing (transit, freight, roads, parking, etc.)  Dynamic infrastructure use (traffic control, lanes, parking, etc.)  Dynamic fleet operations (dispatch, rebalancing, customer incentives, etc.)  Highly uncertain sequential decisions  New technology adoption  Rapidly growing/changing community