Infrastructure

Tandem Toll Booths for the Golden Gate Bridge

Hall, Randolph W.
Carlos Daganzo
1983

Many toll plazas are constrained in width by buildings or other physical barriers. These barriers may make the cost of adding toll lanes prohibitive. One method for increasing the capacity of a toll facility without increasing its width is to use tandem toll booths. A tandem toll booth consists of two toll takers in a single toll lane both serving alternating sets of vehicles simultaneously. The capacity of tandem toll booths is calculated with time-space diagrams and the cumulative headway distributions of vehicles at a conventional toll booth. The capacity depends on the maximum of...

Crane Double Cycling in Container Ports: Affect on Ship Dwell Time

Goodchild, Anne V.
Carlos Daganzo
2005

Loading ships as they are unloaded (double-cycling) can improve the efficiency of a quay crane and thus container port. This paper describes the double-cycling problem, and presents two solution algorithms and simple formulae to estimate reductions in the number of operations, and operating time. The problem is formulated as a scheduling problem. Small problems can be solved to optimality with a standard numerical solver, but problems of typical size are computationally burdensome and terminated after 10 hours with optimality gaps larger than 50%. A formula for an improved lower bound to...

Analytical Capacity Comparison of One-Way and Two-Way Signalized Street Networks

Gayah, Vikash V.
Carlos Daganzo
2012

Recently cities have been converting traditional one-way downtown street networks to two-way operation partly because one-way networks are seen as confusing and as less conducive to economic activity and a livable environment and they require vehicles to travel longer distances on average. However, one of the main disadvantages of such conversions is thought to be a reduction in the network's ability to serve vehicles. Intersections in two-way networks can serve fewer vehicles per unit time than their one-way counterparts. Several studies have assessed the differences between these two...

On the Design of Public Infrastructure Systems with Elastic Demand

Carlos Daganzo
2012

This paper considers the optimization of public infrastructure systems, recognizing that these systems serve multiple user classes. Example application domains include: public transportation systems, electricity distribution grids, urban water distribution systems, and maintenance of pavement and bridge systems. Under the guidance of a policy-making body, the analyst chooses both the system design, including its layout and control, and the prices to be charged for the service. The goal of the optimization is to maximize society’s welfare recognizing that the system’s performance will in...

A Reliability-Based Optimization Scheme for Maintenance Management in Large-Scale Bridge Networks

Hu, Xiaofei
Carlos Daganzo
Madanat, Samer
2015

Incorporating network configurations in bridge management problems is computationally difficult. Because of the interdependencies among bridges in a network, they have to be analyzed together. Simulation-based numerical optimization techniques adopted in past research are limited to networks of moderate sizes. In this paper, a simple framework is developed to determine optimal maintenance plans for large networks with many bridges. The objective is to minimize disruption, specifically, the extra travel distance caused by potential bridge failures over a planning horizon and under a budget...

Assembly System Design Principles and Trade-offs

Blumenfeld, Dennis E.
Carlos Daganzo
2025

A Multi-channel VANET Providing Concurrent Safety and Commercial Services

Mak, Tony K.
Laberteaux, Kenneth P.
Raja Sengupta
2005

One of the key goals of a vehicular ad-hoc network (VANET) is providing sufficient quality of service (QoS) for real-time safety applications while concurrently supporting commercial services. This paper proposes a multi-channel wireless communication architecture and protocol for the scenario where commercial services are provided by roadside infrastructure. This solution extends the IEEE 802.11 wireless LAN protocol to schedule periodic safety messages in a "safety channel". It explicitly supports concurrent non-time-critical communications in separate, non-safety "service channels"....

Vision-Based Following of Structures Using an Unmanned Aerial Vehicle (UAV)

Rathinam, Sivakumar
Kim, ZuWhan
Raja Sengupta
2006

Inspecting and monitoring oil-gas pipelines, roads, bridges, canals are very important in ensuring the reliability and life expectancy of these civil systems. An autonomous Unmanned Aerial Vehicle (UAV) can decrease the operational costs, expedite the monitoring process and be used in situations where a manned inspection is not possible. This paper addresses the problem of monitoring these systems using an autonomous UAV based on visual feedback. A single structure detection algorithm that can identify and localize various structures including highways, roads, and canals is presented in...

The software architecture of the Berkeley UAV Platform

Tisdale, John
Ryan, Allison
Zennaro, Marco
Xiao, Xiao
Caveney, Derek
Rathinam, Siva
Hedrick, J. Karl
Raja Sengupta
2006

This paper details the software architecture of the Berkeley unmanned aerial vehicle (UAV) platform. Developed over the course of three years, this platform has successfully demonstrated autonomous vision-based navigation and obstacle avoidance. A software architecture has been developed to allow for collaborative control concepts to be examined. This modular architecture has been shown to be effective for use in allowing a team of UAVs to collaboratively perform a set of missions. The performance of the architecture was demonstrated using 3 UAVs to perform autonomous collaborative...

Multi-Channel Medium Access Control for Dedicated Short Range Communications

Mak, Tony K.
Laberteaux, Kenneth P.
Raja Sengupta
Ergen, Mustafa
2006

This paper describes a medium access control (MAC) protocol to enable multi-channel operation for dedicated short range communication (DSRC). In particular, we focus on the challenge of supporting potentially high-bandwidth commercial or info-tainment communications between vehicle and roadside in hotspots over several service channels, while concurrently enabling time-critical vehicle-vehicle communication for safety in a separate channel. In our architecture, within hotspots, communication is aided by one of the access points in the hotspot. This access point is designated the...