Data

V2TATC: Joint Voice-Trajectory Embedding and Dataset for Air Traffic Controller Situational Awareness

Brusset, Louis
Petit, Mathurin
Kam, Jordan
Alexandre Bayen
2026

As air traffic volumes in the National Airspace System continue to expand, in particular at low altitude, the need for scalable decision support tools used by air traffic controllers will also require more development. This article introduces Voice-to-Trajectory for Air Traffic Control, a joint voice communication-flight trajectory data embedding framework, that can be a component of situational awareness in congested airspaces, and assist the development of tools for ATC as they reason in real-time over Automatic Dependent Surveillance-Broadcast trajectories, or the intent expressed by...

Employing Area Under the Curve (AUC) to Reduce Many Repeated Measures into Single Variables for Analysis: A Simulation Study

Daniel Rodriguez
2026

Background: The proliferation of fitness apps and wearable technology provides researchers interested in health and fitness with vast opportunities to test hypotheses involving a continuous stream of data collected on individual research participants in real-world settings. Although there are a variety of methods available to analyze such repeated measures data, one method that may benefit researchers in these endeavors is Area Under the Curve (AUC). To our knowledge, AUC has yet to be assessed for efficacy with many repeated measures collected from fitness apps. As such, the purpose of...

Economic and Environmental Benefits for Electricity Grids from Spatiotemporal Optimization of Electric Vehicle Charging

Soomin Woo
Zhe Fu
Elpiniki Apostolaki-Iosifidou
Tim Lipman
2021
This article addresses the problem of estimating the potential economic and environmental gains for utility grids of shifting the electric-vehicle (EV) charging time and location. The current literature on shifting EV charging loads has been limited by real-world data availability and has typically therefore relied on simulated studies. Collaborating with a large automobile company and a major utility grid operator in California, this research used actual EV operational data and grid-operation data including locational marginal prices, marginal-grid-emission-rate data, and renewable-energy-...

Plug-in-Hybrid Vehicle Use, Energy Consumption, and Greenhouse Emissions: An Analysis of Household Vehicle Placements in Northern California

Brett Williams
Elliot Martin
Tim Lipman
Daniel Kammen
2011
We report on the real-world use over the course of one year of a nickel-metal-hydride plug-in hybrid—the Toyota Plug-In HV—by a set of 12 northern California households able to charge at home and work. From vehicle use data, energy and greenhouse-emissions implications are also explored. A total of 1557 trips—most using under 0.5 gallons of gasoline—ranged up to 2.4 hours and 133 miles and averaged 14 minutes and 7 miles. 399 charging events averaged 2.6 hours. The maximum lasted 4.6 hours. Most recharges added less than 1.4 kWh, with a mean charge of 0.92 kWh. The average power drawn was...

Assessment of Combined Heat and Power System and "Premium Power" Applications in California

Zack Norwood
Tim Lipman
Michael Stadler
Chris Marnay
Ernest Orlando
2010

The effectiveness of combined heat and power (CHP) systems for power interruption intolerant 'premium power'; facilities is the focus of this study. Through three real-world case studies and economic cost minimization modeling, the economic and environmental performance of 'premium power' CHP is analyzed. The results of the analysis for a brewery, data center, and hospital lead to some interesting conclusions about CHP limited to the specific CHP technologies installed at those sites. Firstly, facilities with high heating loads prove to be the most appropriate for CHP installations from a...

Challenges and Opportunities for Electric Vehicle Charging Detection Using Utility Energy Consumption Data

Elpiniki Apostolaki-Iosifidou
Soomin Woo
Tim Lipman
2019

Partly in response to ongoing environmental and energy security concerns, and with supportive government policies, the total number of electric vehicles (EVs) has been rapidly increasing in the last years worldwide. The growing EV penetration into the electric power system changes the electricity consumption profiles and leads to challenges for different stakeholders such as transmission system operators and electric utilities. Electric utilities benefit from having information of EV charging to forecast any additional load and peaks, to understand temporal and spatial aspects, and to...

Electric Vehicle Charge Management for Lowering Costs and Environmental Impact

Elpiniki Apostolaki-Iosifidou
Marco Pruckner
Soomin Woo
Tim Lipman
2020

As the number of electric vehicles is increasing, there is a pervasive call for research and new strategies in the field of vehicle grid integration. Using electric vehicle real-time data, drivers' spatial behavior and patterns can be derived for their morning and evening commute. These patterns combined with dynamic electricity costs, wholesale and retail, and variable greenhouse gas (GHG) emissions, lead to significant outcomes on savings and environmental impact. In this study, electric vehicle charging management is analyzed for the case of north California, using real world data. The...

Wind-Assist Marine Demonstration for Ferries: Prospects for Saving Diesel Fuel With Wind Power

Tim Lipman
Jeffrey Lidicker
2019

These sailing vessel testing, data collection and analysis project examined the real world potential for a novel carbon-fibre 'wingsail' technology to reduce fuel use in potential passenger ferryboat applications. The project involved building a carbon fibre, computer-controlled wingsail that was then mounted on a 14-metre trimaran test vessel with a complete instrumentation package. The vessel was then operated on the San Francisco Bay over a three-month period. The test results were conclusive that, for a test vessel travelling at seven knots though water on a particular ferry route, up...

Wind-Assist Marine Demonstration for San Francisco Bay Ferry Districts: Prospects for Saving Diesel Fuel with Wind Power

Tim Lipman
2015

This sailing vessel testing, data collection and analysis project examined the “real world” potential for a novel carbon-fiber “wingsail” technology to reduce fuel use in potential passenger ferryboat applications. In the study, a series of controlled tests were performed, accomplished by using a wingsail wind-assist technology developed by Wind+Wing Technologies. The project involved building a carbon fiber wingsail that was then mounted on a 42-foot (14-meter) trimaran test vessel. The test vessel was outfitted with a complete instrumentation package with data-recording capability. The...

Evaluating the Public Perception of a Feebate Policy in California Through the Estimation and Cross-Validation of an Ordinal Regression Model

Elliot Martin
Susan Shaheen
Tim Lipman
Madonna Camel
2014

Understanding the key factors influencing policy perception can be critical for informing the design of public policies. Feebates is a unique public policy that is meant to influence vehicle purchases. It presents buyers with a rebate for purchasing low-emission vehicles and a fee for purchasing high-emission vehicles. Because feebates directly impacts the consumer, understanding the dynamics of public perception, support, and opposition is important. This study explores the public perception of a potential feebate policy within California, and evaluates the robustness of an ordinal...