Modeling

Simulation of Transit Signal Priority Using the NTCIP Architecture

Liu, Hongchao
Skabardonis, Alexander
Li, Meng
2006

Transit Signal Priority (TSP) is an important element of Bus Rapid Transit (BRT) that involves coordinated efforts between transit vehicle detection systems, traffic signal control systems, and communication technologies. Successful deployment of TSP requires thorough laboratory evaluation through simulation before field implementation. This paper presents the development and application of a simulation model specifically designed for the design and evaluation of TSP systems. The proposed simulation tool models in detail all the TSP components in accordance with the National Transportation...

Airport Availability Modelling: A Different Perspective

Rakas, Jasenka
Hecht, Myron
2007

This study proposes a systems-level approach to airport and runway availability assessments and prediction, and addresses the problem of the aging or continuously degrading aviation infrastructure. Although the availability block diagrams are often used in the availability assessment of aerospace and electronic systems, their application to the airport availability problem on a system level, developed in this study, is novel. The proposed methodology is intended for short-term and long-term planning of the Communication, Navigation and Surveillance (CNS) equipment acquisition, and...

Controller-Pilot Voice Communication and Intent Monitoring for Future Aviation Systems Safety

Rakas, Jasenka
Vallioor, Vishali Kirthi
Krozel, Jimmy
Kostiuk, Peter F.
Mohen, Michael T.
2024

In this study, a set of models and software are developed to support Aviation System Safety Analysis tasks. Three primary models are utilized to conduct the following analyses: (1) Speech Attribute analysis, (2) Speech-to-Text analysis, and (3) Intent Inference analysis. We analyze air traffic controller-pilot speech attributes and transcribed texts of voice messages to gain additional insights into controller-pilot communication dynamics. Such analyses are integrated with situation assessment modules to identify any anomalies in flight trajectories. Key speech attribute patterns are...

Deterministic Models for Degraded Airside Capacity and Delays

Rakas, Jasenka
Schonfeld, Paul
2004

This paper presents deterministic models for estimating airspace and airport capacity and delays during equipment outages. The National Airspace System (NAS) is very complex and consists of almost 48,000 reportable facilities and services that support air traffic control with very diverse functions and technologies. To better understand NAS performance and develop a methodology for estimating degraded capacity, previous studies about equipment outages and about airspace and airport performance are first reviewed. A deterministic aircraft separation model is used to estimate degraded...

Methodology for Estimating Terminal Airspace Service Availability and System Effectiveness

Rakas, Jasenka
Hansen, Mark
2012

This paper develops a methodology for modeling the terminal airspace service availability and system effectiveness.

Modeling the Impact of Equipment Outages on National Airspace System Operations

Rakas, Jasenka
Yin, Huifang
2012

This study is part of a larger effort initiated by the FAA’s System Capacity Office, Capacity Initiative Division, toward developing a methodology for assessing airport performance and establishing airport efficiency metrics for runway and airport utilization.

Multi-Objective Modeling for Determining Location of Undesirable Facilities

Rakas, Jasenka
Teodorović, Dušan
Kim, Taehyung
2004

This paper develops a model for determining locations of undesirable facilities. It is formulated as multi-objective since the problem of locating undesirable facilities faces many conflicting criteria. A method is also proposed to appropriately address uncertainty associated with this class of location problems. The methodology developed in this study is tested using the real-world data.

Statistical Modeling and Analysis of Landing Time Intervals: Case Study of Los Angeles International Airport, California

Rakas, Jasenka
Yin, Huifang
2005

Existing literature suggests that analyses of landing time intervals employ simple statistical models based on time-separation histograms, usually approximated by normal distributions. Although the literature focuses on important issues such as safety, capacity improvements, and separation rules, it does not take into account another important issue: the possible, unique behavior of airlines, pilots, and controllers. In this study such possible, unique behavior is taken into account and a statistical analysis on landing time intervals is performed to find the operational properties of Los...

San Diego Integrated Corridor Management (ICM), Phase 3 Demonstration and Evaluation [Project]

Skabardonis, Alexander
2010

The third stage of the federal Integrated Corridor Management (ICM) Initiative involves performing the demonstration and evaluation for the I-15 ICM system in San Diego County along the I-15 corridor. The San Diego ICM Pioneer Site Team is led by San Diego Association of Governments (SANDAG) and in partnership with the U.S. Department of Transportation (USDOT), Caltrans, the cities of San Diego, Poway and Escondido, and the transit agencies that operate within the I-15 corridor, namely, the Metropolitan Transit System (MTS) and the North County Transit District (NCTD). This task supports...

San Diego I-15 Integrated Corridor Management (ICM) System: Stage II (Analysis, Modeling, and Simulation)

Miller, Mark A
Skabardonis, Alex
University of California, Berkeley
California Department of Transportation
2003

This report provides background on efforts to date of the U.S. Department of Transportation’s (USDOT) Integrated Corridor Management (ICM) System Program for the Interstate 15 corridor in San Diego County, one of eight sites selected to participate in the USDOT ICM program. The program’s goal is to counteract the effects of increasing congestion area on freeways, arterials and the public transit network. The report focuses on Stage II of the ICM project. Stage II work was scheduled for completion in Fall 2009, and was to be followed by Stage III, which includes implementation. The report...