Modeling

Area under the curve as an alternative to latent growth curve modeling when assessing the effects of predictor variables on repeated measures of a continuous dependent variable

Rodriguez, Daniel
2023
Researchers conducting longitudinal data analysis in psychology and the behavioral sciences have several statistical methods to choose from, most of which either require specialized software to conduct or advanced knowledge of statistical methods to inform the selection of the correct model options (e.g., correlation structure). One simple alternative to conventional longitudinal data analysis methods is to calculate the area under the curve (AUC) from repeated measures and then use this new variable in one’s model. The present study assessed the relative efficacy of two AUC measures: the AUC...

Analysis of Channel Access Schemes for Model-based Estimation over Multi-access Networks

Huang, Ching-Ling
Sengupta, Raja
2009

This report investigates the performance of model-based estima-tion over multi-access networks and emphasizes on the estimationMSE (mean squared error) while using different channel access schemes:probabilistic (random access), deterministic (round-robin scheduling),and combined (grouped channel access). We propose a mathematicalframework for estimation over a simple multi-access MAC protocol,the slotted ALOHA network. Estimation MSE, its asymptotic be-havior and stability condition are derived for different channel accessmethods. Our quantitative discussion can provide guidelines to...

Human Driver Model Development

Cody, Delphine
Tan, Swekuang
Garcia, Aurelien
2005

This report presents the continuation of the development of a naturalistic driver model (PADRIC) initiated under MOU 369 Human driver model. The development consists of increasing the scope of simulation capabilities to lane-change maneuvers and gathering data for the calibration of the car-following mode already implemented. The first part of the report presents the development of the model architecture for integrating lane change maneuver. The second part is focused on the data collection that was conducted and proposes a discussion of the method and shortcoming for gathering the data of...

Effectiveness of Adaptive Traffic Control for Arterial Signal Management: Modeling Results

Skabardonis, Alexander
Gomes, Gabriel
2010

This study identifies and selects the most promising existing adaptive control algorithms for arterial streets, evaluates performance through simulation, and develops a plan for field testing of the most promising algorithms on a real-world arterial. A section of Highway 1 in the city of Lomita, California was selected as the test site for evaluation of adaptive signal control strategies. A methodology was developed to obtain a time-varying origin-destination (OD) matrix from the system loop detector data at the test site. The calibrated OD matrix was applied to a microscopic...

Development and Implementation of a Vehicle-Centered Fault Diagnostic and Management System for the Extended PATH-AHS Architecture: Part I

Yi, Jingang
Suryanarayanan, Shashikanth
Howell, Adam
Horowitz, Roberto
Tomizuka, Masayoshi
Hedrick, Karl
Alvarez, Luis
2002

The purpose of this project is to extend and integrate existing results on fault diagnostics and fault management for passenger vehicles used in automated highway systems (AHS). These results have been combined to form a fault diagnostic and management system for the longitudinal and lateral control systems of the automated vehicles which has a hierarchical framework that complements the established PATH control system. Furthermore, the fault diagnostic module effectively monitors the sensors and actuators required for longitudinal and lateral control, while the fault handling module...

San Diego I-15 Integrated Corridor Management (ICM) System: Phase I

Miller, Mark
Novick, Linda
Li, Yuwei
Skabardonis, Alex
2008

This report describes the Stage One work of the US Department of Transportation’s (DOT) federally-sponsored Integrated Corridor Management (ICM) Program for the I-15 Corridor in San Diego County, California, between State Route 52 in the city of San Diego and State Route 78 in the city of Escondido. The development work is based on the systems engineering process whereby this work focused specifically on the concept of operations and the system requirements specifications. The development of the concept of operations consists of the following elements: vision, goals and objectives for the...

A Continuing Systems-level Evaluation Of Automated Urban Freeways: Year Three

Johnston, Robert A.
Ceerla, Raju
1993

The purpose of this study was to demonstrate the travel and emissions impacts of urban freeway automation scenarios and to compare these to travel demand reduction scenarios, such as travel pricing and land use intensification. The Sacramento regional travel demand model set was used and an alternatives analysis was conducted. Two protocols are used to operate the model set. Results are discussed, comparing the alternative scenarios, and methodological findings are discussed, comparing the results from the two protocols for operating the model set. Methodological findings present new ideas...

Coordination Layer Control Design for Automated Trucks and Buses

Lu, Xiao-Yun
Joo, Sungmoon
Hedrick, Karl
2004

This project studies the coordination layer control and decision making for automated trucks and buses. Maneuver design and coordination algorithms need to take several factors into consideration. Practical achievement in this project includes the following: automated ground vehicle maneuver coordination; maneuver design for automated trucks/buses; model-based simulation package development for control design and real-time code development.

Revenue Models for Advanced Traveler Information Systems

Yim, Y. B.
2001

The paper describes current trends in the traveler information supply system and the prospect for potential markets for advanced traveler information in the United States and Europe. Alternative revenue models are identified that may be able to support the operation of the newly created traveler information centers in the post-field operational test phase. In the past, public agencies have been reluctant to share traffic management responsibilities with the private sector. However, this study found that the current trend is toward a public-private partnership in the form of a franchised or...

The Aerodynamic Forces On Misaligned Platoons

Marcu, Bogdan
Browand, Fred
1998

This report summarizes wind tunnel experimental measurementson the aerodynamic interaction between members of misaligned platoons. Experiments are conducted at the University of Southern California's Dryden Wind Tunnel Facility. All experiments are made using 1/8 scale models of 1991 Chevy Lumina minivan. Models are placed above a ground plane with a porous surface, through which slight suction is applied to remove the boundary layer. Refurbishing of the ground plane surface, and its repositioning to a 1 degree angle of attack produce significantly improved air flow through the test...