Steve A. Chien

184 papers A* 29A 10B 4C 20Misc 3Journal 79Unranked 35

Year	Rank	Type	Title / Venue / Authors
2026	J	`jnl`	Dynamic Targeting of Satellite Observations Using Supplemental Geostationary Satellite Data and Hierarchical Planning. CoRR Akseli Kangaslahti, Itai Zilberstein, Alberto Candela, Steve A. Chien
2026	J	`jnl`	Large-Scale Continual Scheduling and Execution for Dynamic Distributed Satellite Constellation Observation Allocation. CoRR Itai Zilberstein, Steve A. Chien
2025	J	`jnl`	Autonomous surface sampling for the Europa Lander mission concept. Sci. Robotics Joseph Bowkett, Steve A. Chien, Yuliya Marchetti, Jeremy Nash, Daniel Pastor Moreno, Connor Basich, Matthew Gildner, D. I. Kim, Joseph A. Russino, D. Wang, Jean-Pierre de la Croix, Grace Lim, Caleb Wagner, Lori Shiraishi, Philip Twu, Nikola Georgiev, Blair Emanuel, Marissa Cameron, Yumi Iwashita, Kevin P. Hand, C. B. Phillips, Scott Tepsuporn, Cecilia Mauceri, G. H. Tan-Wang, Glenn Reeves, Paul G. Backes
2025	J	`jnl`	Decentralized, Decomposition-Based Observation Scheduling for a Large-Scale Satellite Constellation. J. Artif. Intell. Res. Itai Zilberstein, Ananya Rao, Matthew Salis, Steve A. Chien
2025	J	`jnl`	Demonstrating Onboard Inference for Earth Science Applications with Spectral Analysis Algorithms and Deep Learning. CoRR Itai Zilberstein, Alberto Candela, Steve A. Chien, David D. W. Rijlaarsdam, Tom Hendrix, Léonie Buckley, Aubrey Dunne
2025	J	`jnl`	Flight of Dynamic Targeting on the CogniSAT-6 Spacecraft. CoRR Steve A. Chien, Itai Zilberstein, Alberto Candela, David D. W. Rijlaarsdam, Tom Hendrix, Aubrey Dunne, Oriol Aragon Casaled, Juan Puig Miquel
2025	J	`jnl`	Learning-Based Planning for Improving Science Return of Earth Observation Satellites. CoRR Abigail Breitfeld, Alberto Candela, Juan Delfa, Akseli Kangaslahti, Itai Zilberstein, Steve A. Chien, David Wettergreen
2025	A	`conf`	Planning, Scheduling, and Execution on the Moon: The CADRE Technology Demonstration Mission. AAMAS Gregg R. Rabideau, Joseph A. Russino, Andrew Branch, Nihal Dhamani, Tiago Stegun Vaquero, Steve A. Chien, Jean-Pierre de la Croix, Federico Rossi
2025	J	`jnl`	Planning, scheduling, and execution on the Moon: the CADRE technology demonstration mission. CoRR Gregg R. Rabideau, Joseph A. Russino, Andrew Branch, Nihal Dhamani, Tiago Stegun Vaquero, Steve A. Chien, Jean-Pierre de la Croix, Federico Rossi
2025	J	`jnl`	Real-Time Instrument Planning and Perception for Novel Measurements of Dynamic Phenomena. CoRR Itai Zilberstein, Alberto Candela, Steve A. Chien
2025	J	`jnl`	Utility-Driven Approach to Onboard Scheduling and Execution for an Autonomous Europa Lander Mission. J. Aerosp. Inf. Syst. Joseph A. Russino, Daniel Wang, Caleb Wagner, Gregg R. Rabideau, Faiz Mirza, Connor Basich, Cecilia Mauceri, Philip Twu, Glenn Reeves, Grace Tan-Wang, Steve A. Chien
2024	A*	`conf`	Decentralized, Decomposition-Based Observation Scheduling for a Large-Scale Satellite Constellation. ICAPS Itai Zilberstein, Ananya Rao, Matthew Salis, Steve A. Chien
2024	J	`jnl`	Demonstrating Autonomy for Complex Space Missions: A Europa Lander Mission Autonomy Prototype. J. Aerosp. Inf. Syst. Caleb Wagner, Cecilia Mauceri, Philip Twu, Yuliya Marchetti, Joseph A. Russino, Dustin Aguilar, Gregg R. Rabideau, Scott Tepsuporn, Steve A. Chien, Glenn Reeves
2024	C	`conf`	Dynamic Targeting Scenario to Study the Planetary Boundary Layer. IGARSS Alberto Candela, Juan Delfa Victoria, Itai Zilberstein, Marcin Kurowski, Qing Yue, Steve A. Chien
2024	A*	`conf`	Dynamic Targeting of Satellite Observations Incorporating Slewing Costs and Complex Observation Utility. ICRA Akseli Kangaslahti, Alberto Candela, Jason Swope, Qing Yue, Steve A. Chien
2024	J	`jnl`	Exploring beyond Earth using space robotics. Sci. Robotics Steve A. Chien, Gianfranco Visentin, Connor Basich
2024	C	`conf`	Leveraging Commercial Assets, Edge Computing, and Near Real-Time Communications for an Enhanced New Observing Strategies (NOS) Flight Demonstration. IGARSS Steve A. Chien, Alberto Candela, Itai Zilberstein, David D. W. Rijlaarsdam, Tom Hendrix, Aubrey Dunne
2024	J	`jnl`	Storm Classification and Dynamic Targeting for a Smart Ice Cloud Sensing Satellite. J. Aerosp. Inf. Syst. Jason Swope, Steve A. Chien, Xavier Bosch-Lluis, Emily Dunkel, Qing Yue, Mehmet Ogut, Isaac Ramos, Pekka Kangaslahti, William R. Deal, Caitlyn Cooke
2023	J	`jnl`	Autonomous robotics is driving Perseverance rover's progress on Mars. Sci. Robotics Vandi Verma, Mark W. Maimone, Daniel M. Gaines, Raymond Francis, Tara A. Estlin, Stephen Kuhn, Gregg R. Rabideau, Steve A. Chien, Michael M. McHenry, Evan J. Graser, Arturo L. Rankin, Ellen R. Thiel
2023	J	`jnl`	Benchmarking Deep Learning Models on Myriad and Snapdragon Processors for Space Applications. J. Aerosp. Inf. Syst. Emily Dunkel, Jason Swope, Alberto Candela, Lauren West, Steve A. Chien, Zaid J. Towfic, Léonie Buckley, Juan Romero-Cañas, José Luis Espinosa-Aranda, Elena Hervas-Martin, Mark R. Fernandez
2023	J	`jnl`	Decentralized Observation Allocation for a Large-Scale Constellation. J. Aerosp. Inf. Syst. Shreya Parjan, Steve A. Chien
2023	J	`jnl`	Dynamic Targeting to Improve Earth Science Missions. J. Aerosp. Inf. Syst. Alberto Candela, Jason Swope, Steve A. Chien
2023	J	`jnl`	Enabling Astronaut Self-Scheduling using a Robust Advanced Modelling and Scheduling system: an assessment during a Mars analogue mission. CoRR Michael Saint-Guillain, Jean Vanderdonckt, Nicolas Burny, Vladimir Pletser, Tiago Vaquero, Steve A. Chien, Alexander Karl, Jessica J. Márquez, John A. Karasinski, Cyril Wain, Audrey Comein, Ignacio S. Casla, Jean Jacobs, Julien Meert, Cheyenne Chamart, Sirga Drouet, Julie Manon
2023	C	`conf`	Fully Automated Volcano Monitoring and Tasking with Planet SkySat Constellation: Results from a Year of Operations. IGARSS James Mason, Tessa Holzmann, Jason Swope, Ashley Gerard Davies, Steve A. Chien, Joel Mueting, Tanya N. Harrison, Vishwa Shah, J. J. Walter
2023	J	`jnl`	Multirobot Onsite Shared Analytics Information and Computing. IEEE Trans. Control. Netw. Syst. Joshua Vander Hook, Federico Rossi, Tiago Vaquero, Martina Troesch, Marc Sanchez Net, Joshua Schoolcraft, Jean-Pierre de la Croix, Steve A. Chien
2023	J	`jnl`	Property-Based Brittleness Analysis of Temporal Networks. J. Aerosp. Inf. Syst. Tiago Vaquero, Steve A. Chien, Jagriti Agrawal, Michael Saint-Guillain, Maxime Parmentier
2023	J	`jnl`	Using Unsupervised and Supervised Learning and Digital Twin for Deep Convective Ice Storm Classification. CoRR Jason Swope, Steve A. Chien, Emily Dunkel, Xavier Bosch-Lluis, Qing Yue, William R. Deal
2023	C	`conf`	Using a Sensorweb for High-Resolution Flood Monitoring on a Global Scale. IGARSS Akseli Kangaslahti, Steve A. Chien, Jason Swope, James Mason, Joel Mueting, Tanya N. Harrison
2022	A	`conf`	A Sampling Based Approach to Robust Planning for a Planetary Lander. IROS Connor Basich, Joseph A. Russino, Steve A. Chien, Shlomo Zilberstein
2022	A*	`conf`	An Efficient Approach to Data Transfer Scheduling for Long Range Space Exploration. IJCAI Emmanuel Hebrard, Christian Artigues, Pierre Lopez, Arnaud Lusson, Steve A. Chien, Adrien Maillard, Gregg R. Rabideau
2022	A*	`conf`	Analyzing the Efficacy of Flexible Execution, Replanning, and Plan Optimization for a Planetary Lander. ICAPS Daniel Wang, Joseph A. Russino, Connor Basich, Steve A. Chien
2022	C	`conf`	Autonomous Capabilities and Command and Data Handling Design for the Smart Remote Sensing of Cloud Ice. IGARSS Mehmet Ogut, Xavier Bosch-Lluis, Pekka Kangaslahti, Isaac Ramos-Pérez, Joan Francesc Muñoz-Martín, Joelle Cooperrider, Qing Yue, Jason Swope, Peyman Tavallali, Steve A. Chien, Omkar Pradhan, William R. Deal, Caitlyn Cooke
2022	C	`conf`	Benchmarking Deep Learning Inference of Remote Sensing Imagery on the Qualcomm Snapdragon And Intel Movidius Myriad X Processors Onboard the International Space Station. IGARSS Emily Dunkel, Jason Swope, Zaid J. Towfic, Steve A. Chien, Damon Russell, Joseph Sauvageau, Douglas Sheldon, Juan Romero-Cañas, José Luis Espinosa-Aranda, Léonie Buckley, Elena Hervas-Martin, Mark R. Fernandez, Carrie Knox
2022	C	`conf`	Benchmarking Remote Sensing Image Processing and Analysis on the Snapdragon Processor Onboard the International Space Station. IGARSS Jason Swope, Faiz Mirza, Emily Dunkel, Zaid J. Towfic, Steve A. Chien, Damon Russell, Joe Sauvageau, Doug Sheldon, Mark R. Fernandez, Carrie Knox
2022	C	`conf`	Demonstrating a New Flood Observing Strategy on the NOS Testbed. IGARSS Ben Smith, Sujay Kumar, Louis Nguyen, Thad Chee, James Mason, Steve A. Chien, Chad Frost, Ruzbeh Akbar, Mahta Moghaddam, Augusto Getirana, Leigha Capra, Paul T. Grogan
2022	C	`conf`	Dynamic Targeting for Improved Tracking of Storm Features. IGARSS Alberto Candela, Jason Swope, Steve A. Chien, Hui Su, Peyman Tavallali
2022	—	`conf`	Formal Methods for Trusted Space Autonomy: Boon or Bane? NFM Steve A. Chien
2022	J	`jnl`	Romie: A domain-independent tool for computer-aided robust operations management. Eng. Appl. Artif. Intell. Michael Saint-Guillain, Jonas Gibaszek, Tiago Vaquero, Steve A. Chien
2022	A*	`conf`	Temporal Multimodal Multivariate Learning. KDD Hyoshin Park, Justice Darko, Niharika Deshpande, Venktesh Pandey, Hui Su, Masahiro Ono, Dedrick Barkely, Larkin Folsom, Derek J. Posselt, Steve A. Chien
2022	J	`jnl`	Temporal Multimodal Multivariate Learning. CoRR Hyoshin Park, Justice Darko, Niharika Deshpande, Venktesh Pandey, Hui Su, Masahiro Ono, Dedrick Barkely, Larkin Folsom, Derek J. Posselt, Steve A. Chien
2021	J	`jnl`	Activity-Based Scheduling of Science Campaigns for the Rosetta Orbiter. J. Aerosp. Inf. Syst. Steve A. Chien, Gregg R. Rabideau, Daniel Q. Tran, Martina Troesch, Federico Nespoli, Miguel Perez Ayucar, Marc Costa Sitja, Claire Vallat, Bernhard Geiger, Fran Vallejo, Rafael Andres, Nico Altobelli, Michael Kueppers
2021	J	`jnl`	Analyzing the effectiveness of rescheduling and Flexible Execution methods to address uncertainty in execution duration for a planetary rover. Robotics Auton. Syst. Jagriti Agrawal, Wayne Chi, Steve A. Chien, Gregg R. Rabideau, Daniel M. Gaines, Stephen Kuhn
2021	J	`jnl`	Enabling Limited Resource-Bounded Disjunction in Scheduling. J. Aerosp. Inf. Syst. Jagriti Agrawal, Wayne Chi, Steve A. Chien, Gregg R. Rabideau, Stephen Kuhn, Daniel M. Gaines, Tiago Vaquero, Sarah Bhaskaran
2021	J	`jnl`	Multi-Robot On-site Shared Analytics Information and Computing. CoRR Joshua Vander Hook, Federico Rossi, Tiago Vaquero, Martina Troesch, Marc Sanchez Net, Joshua Schoolcraft, Jean-Pierre de la Croix, Steve A. Chien
2021	J	`jnl`	Operations for Autonomous Spacecraft. CoRR Rebecca Castaño, Tiago Vaquero, Federico Rossi, Vandi Verma, Ellen Van Wyk, Dan Allard, Bennett Huffmann, Erin M. Murphy, Nihal Dhamani, Robert A. Hewitt, Scott Davidoff, Rashied B. Amini, Anthony Barrett, Julie C. Castillo-Rogez, Steve A. Chien, Mathieu Choukroun, Alain Dadaian, Raymond Francis, Benjamin Gorr, Mark Hofstadter, Mitch Ingham, Cristina Sorice, Iain Tierney
2021	J	`jnl`	Planning the Coverage of Solar System Bodies Under Geometric Constraints. J. Aerosp. Inf. Syst. Adrien Maillard, Steve A. Chien, Christopher Wells
2021	J	`jnl`	Probabilistic Temporal Networks with Ordinary Distributions: Theory, Robustness and Expected Utility. J. Artif. Intell. Res. Michael Saint-Guillain, Tiago Vaquero, Steve A. Chien, Jagriti Agrawal, Jordan R. Abrahams
2020	J	`jnl`	Automated Volcano Monitoring Using Multiple Space and Ground Sensors. J. Aerosp. Inf. Syst. Steve A. Chien, Ashley Gerard Davies, Joshua Doubleday, Daniel Q. Tran, David McLaren, Wayne Chi, Adrien Maillard
2020	A*	`conf`	Demonstration of Autonomous Nested Search for Local Maxima Using an Unmanned Underwater Vehicle. ICRA Andrew Branch, James McMahon, Guangyu Xu, Michael V. Jakuba, Christopher R. German, Steve A. Chien, James C. Kinsey, Andrew D. Bowen, Kevin P. Hand, Jeffrey S. Seewald
2020	C	`conf`	Leveraging Space and Ground Assets in A Sensorweb for Scientific Monitoring: Early Results and Opportunities for the Future. IGARSS Steve A. Chien, James Boerkoel, James Mason, Daniel Wang, Ashley Davies, Joel Mueting, Vivek Vittaldev, Vishwa Shah, Ignacio Zuleta
2020	A*	`conf`	Robustness Computation of Dynamic Controllability in Probabilistic Temporal Networks with Ordinary Distributions. IJCAI Michael Saint-Guillain, Tiago Stegun Vaquero, Jagriti Agrawal, Steve A. Chien
2020	A*	`conf`	Scheduling with Complex Consumptive Resources for a Planetary Rover. ICAPS Wayne Chi, Steve A. Chien, Jagriti Agrawal
2020	J	`jnl`	Using Explainable Scheduling for the Mars 2020 Rover Mission. CoRR Jagriti Agrawal, Amruta Yelamanchili, Steve A. Chien
2019	J	`jnl`	Front delineation and tracking with multiple underwater vehicles. J. Field Robotics Andrew Branch, Mar M. Flexas, Brian Claus, Andrew F. Thompson, Yanwu Zhang, Evan B. Clark, Steve A. Chien, David M. Fratantoni, James C. Kinsey, Brett W. Hobson, Brian Kieft, Francisco P. Chavez
2019	A*	`conf`	Mars On-Site Shared Analytics Information and Computing. ICAPS Joshua Vander Hook, Tiago Vaquero, Federico Rossi, Martina Troesch, Marc Sanchez Net, Joshua Schoolcraft, Jean-Pierre de la Croix, Steve A. Chien
2019	A*	`conf`	Optimizing Parameters for Uncertain Execution and Rescheduling Robustness. ICAPS Wayne Chi, Jagriti Agrawal, Steve A. Chien, Elyse Fosse, Usha Guduri
2019	A*	`conf`	Temporal Brittleness Analysis of Task Networks for Planetary Rovers. ICAPS Tiago Vaquero, Steve A. Chien, Jagriti Agrawal, Wayne Chi, Terrance L. Huntsberger
2019	J	`jnl`	Using Taskable Remote Sensing in a Sensor Web for Thailand Flood Monitoring. J. Aerosp. Inf. Syst. Steve A. Chien, David McLaren, Joshua Doubleday, Daniel Tran, Veerachai Tanpipat, Royal Chitradon
2018	J	`jnl`	Automatic Orbit Selection for a Radio Interferometric Spacecraft Constellation. J. Aerosp. Inf. Syst. Steve Schaffer, Steve A. Chien, Andrew Branch, Sonia Hernandez
2018	J	`jnl`	Autonomous control of marine floats in the presence of dynamic, uncertain ocean currents. Robotics Auton. Syst. Martina Troesch, Steve A. Chien, Yi Chao, John D. Farrara, James Girton, John Dunlap
2018	A*	`conf`	Embedding a Scheduler in Execution for a Planetary Rover. ICAPS Wayne Chi, Steve A. Chien, Jagriti Agrawal, Gregg R. Rabideau, Edward Benowitz, Daniel M. Gaines, Elyse Fosse, Stephen Kuhn, James Biehl
2017	C	`conf`	Hyperion: The first global orbital spectrometer, earth observing-1 (EO-1) satellite (2000-2017). IGARSS Elizabeth M. Middleton, Petya K. E. Campbell, Lawrence Ong, David R. Landis, Qingyuan Zhang, Christopher S. R. Neigh, Karl Fred Huemmrich, Stephen G. Ungar, Daniel J. Mandl, Stuart W. Frye, Vuong Ly, Patrice Cappelaere, Steve A. Chien, Shannon Franks, Nathan H. Pollack
2017	J	`jnl`	Managing Spacecraft Memory Buffers with Concurrent Data Collection and Downlink. J. Aerosp. Inf. Syst. Gregg R. Rabideau, Steve A. Chien, M. Galer, Federico Nespoli, Manuel Costa
2017	J	`jnl`	Onboard Autonomy on the Intelligent Payload Experiment CubeSat Mission. J. Aerosp. Inf. Syst. Steve A. Chien, Joshua Doubleday, David R. Thompson, Kiri L. Wagstaff, John Bellardo, Craig Francis, Eric Baumgarten, Austin Williams, Edmund Yee, Eric T. Stanton, Jordi Piug-Suari
2017	J	`jnl`	Review on space robotics: Toward top-level science through space exploration. Sci. Robotics Steve A. Chien
2016	—	`conf`	Active Control of Marine Vehicles in the Presence of Strong, Dynamic, Uncertain Currents. AAAI Workshop: Planning for Hybrid Systems Martina Troesch, Steve A. Chien, Yi Chao, John D. Farrara
2016	J	`jnl`	Introduction to the Special Issue on Intelligent Systems for Space Exploration. J. Aerosp. Inf. Syst. Richard J. Doyle, Steve A. Chien, David Kortenkamp, Mark Woods
2016	A*	`conf`	Planning and Control of Marine Floats in the Presence of Dynamic, Uncertain Currents. ICAPS Martina Troesch, Steve A. Chien, Yi Chao, John D. Farrara
2016	J	`jnl`	Real-Time Orbital Image Analysis Using Decision Forests, with a Deployment Onboard the IPEX Spacecraft. J. Field Robotics Alphan Altinok, David R. Thompson, Benjamin J. Bornstein, Steve A. Chien, Joshua Doubleday, John Bellardo
2015	A*	`conf`	Activity-Based Scheduling of Science Campaigns for the Rosetta Orbiter. IJCAI Steve A. Chien, Gregg R. Rabideau, Daniel Tran, Martina Troesch, Joshua Doubleday, Federico Nespoli, Miguel Perez Ayucar, Marc Costa Sitja, Claire Vallat, Bernhard Geiger, Nico Altobelli, Manuel Fernandez, Fran Vallejo, Rafael Andres, Michael Kueppers
2015	C	`conf`	Autonomy for remote sensing - Experiences from the IPEX CubeSat. IGARSS Joshua Doubleday, Steve A. Chien, Charles D. Norton, Kiri Wagstaff, David R. Thompson, John Bellardo, Craig Francis, Eric Baumgarten
2015	J	`jnl`	Onboard machine learning classification of images by a cubesat in Earth orbit. AI Matters David R. Thompson, Alphan Altinok, Benjamin J. Bornstein, Steve A. Chien, Joshua Doubleday, John Bellardo, Kiri L. Wagstaff
2014	A*	`ed.`	Proceedings of the Twenty-Fourth International Conference on Automated Planning and Scheduling, ICAPS 2014, Portsmouth, New Hampshire, USA, June 21-26, 2014 ICAPS Steve A. Chien, Minh Binh Do, Alan Fern, Wheeler Ruml
2014	J	`jnl`	Rapid Spectral Cloud Screening Onboard Aircraft and Spacecraft. IEEE Trans. Geosci. Remote. Sens. David R. Thompson, Robert O. Green, Didier Keymeulen, Sarah K. Lundeen, Yasha Mouradi, Daniel Cahn Nunes, Rebecca Castaño, Steve A. Chien
2014	J	`jnl`	Space Applications of Artificial Intelligence. AI Mag. Steve A. Chien, Robert Morris
2013	J	`jnl`	A Case Study of Spectral Signature Detection in Multimodal and Outlier-Contaminated Scenes. IEEE Geosci. Remote. Sens. Lett. David R. Thompson, Lukas Mandrake, Robert O. Green, Steve A. Chien
2013	J	`jnl`	Autonomous Spectral Discovery and Mapping Onboard the EO-1 Spacecraft. IEEE Trans. Geosci. Remote. Sens. David R. Thompson, Benjamin J. Bornstein, Steve A. Chien, Steven Schaffer, Daniel Tran, Brian D. Bue, Rebecca Castaño, Damhnait Gleeson, Aaron Noell
2013	J	`jnl`	Monitoring Flooding in Thailand Using Earth Observing One in a Sensorweb. IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens. Steve A. Chien, Joshua Doubleday, David McLaren, Daniel Tran, Veerachai Tanpipat, Royal Chitradon, Surajate Boonya-aroonnet, Porranee Thanapakpawin, Daniel J. Mandl
2013	J	`jnl`	Onboard Product Generation on Earth Observing One: A Pathfinder for the Proposed Hyspiri Mission Intelligent Payload Module. IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens. Steve A. Chien, David McLaren, Daniel Tran, Ashley Gerard Davies, Joshua Doubleday, Daniel J. Mandl
2013	J	`jnl`	The Eighth International Workshop on Planning and Scheduling for Space (IWPSS). AI Mag. Robert Morris, Steve A. Chien
2012	A	`conf`	Decentralized active robotic exploration and mapping for probabilistic field classification in environmental sensing. AAMAS Kian Hsiang Low, Jie Chen, John M. Dolan, Steve A. Chien, David R. Thompson
2012	J	`jnl`	Introduction to the Special Section on Artificial Intelligence in Space. ACM Trans. Intell. Syst. Technol. Steve A. Chien, Amedeo Cesta
2012	C	`conf`	Spaceborne flight validation of NASA ESTO technologies. IGARSS Charles D. Norton, Michael Pasciuto, Paula Pingree, Steve A. Chien, David Rider
2012	J	`jnl`	Surface Sulfur Detection via Remote Sensing and Onboard Classification. ACM Trans. Intell. Syst. Technol. Lukas Mandrake, Umaa Rebbapragada, Kiri L. Wagstaff, David R. Thompson, Steve A. Chien, Daniel Tran, Robert T. Pappalardo, Damhnait Gleeson, Rebecca Castaño
2012	J	`jnl`	Using Clustering and Metric Learning to Improve Science Return of Remote Sensed Imagery. ACM Trans. Intell. Syst. Technol. David S. Hayden, Steve A. Chien, David R. Thompson, Rebecca Castaño
2011	C	`conf`	Combining space-based and in-situ measurements to track flooding in Thailand. IGARSS Steve A. Chien, Joshua Doubleday, David McLaren, Daniel Tran, Veerachai Tanpipat, Royal Chitradon, Surajate Boonya-aroonnet, Porranee Thanapakpawin, Chatchai Khunboa, Watis Leelapatra, Vichian Plermkamon, Cauligi S. Raghavendra, Daniel J. Mandl
2011	A	`conf`	Current-sensitive path planning for an underactuated free-floating ocean sensorweb. IROS Kristen P. Dahl, David R. Thompson, David McLaren, Yi Chao, Steve A. Chien
2011	—	`conf`	Efficient spectral endmember detection onboard the EO-1 spacecraft. WHISPERS Benjamin J. Bornstein, David R. Thompson, Daniel Tran, Brian D. Bue, Steve A. Chien, Rebecca Castaño
2011	C	`conf`	Space-based Sensorweb monitoring of wildfires in Thailand. IGARSS Steve A. Chien, Joshua Doubleday, David McLaren, Ashley Davies, Daniel Tran, Veerachai Tanpipat, Siri Akaakara, Anuchit Ratanasuwan, Daniel J. Mandl
2011	J	`jnl`	Tractable Goal Selection for Embedded Systems with Oversubscribed Resources. J. Aerosp. Comput. Inf. Commun. Gregg R. Rabideau, Steve A. Chien, David McLaren
2010	C	`conf`	Onboard instrument processing concepts for the HyspIRI mission. IGARSS Steve A. Chien, Dorothy Silverman, Ashley Gerard Davies, David McLaren, Dan Mandl, Jerry Hengemihle
2010	C	`conf`	Onboard processing of multispectral and hyperspectral data of volcanic activity for future Earth-orbiting and planetary missions. IGARSS Ashley Gerard Davies, Steve A. Chien, Daniel Q. Tran, Joshua Doubleday
2010	J	`jnl`	Optimized Autonomous Space In-Situ Sensor Web for Volcano Monitoring. IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens. Wen-Zhan Song, Behrooz A. Shirazi, Renjie Huang, Mingsen Xu, Nina M. Peterson, Richard LaHusen, John Pallister, Daniel Dzurisin, Seth Moran, Mike Lisowski, Sharon Kedar, Steve A. Chien, Frank Webb, Aaron B. Kiely, Joshua Doubleday, Ashley Davies, David Pieri
2010	A*	`conf`	Spatiotemporal path planning in strong, dynamic, uncertain currents. ICRA David R. Thompson, Steve A. Chien, Yi Chao, Peggy Li, Bronwyn Cahill, Julia Levin, Oscar Schofield, Arjuna P. Balasuriya, Stephanie Petillo, Matt Arrott, Michael Meisinger
2010	A*	`conf`	Timeline-Based Space Operations Scheduling with External Constraints. ICAPS Steve A. Chien, Daniel Tran, Gregg R. Rabideau, Steve R. Schaffer, Dan Mandl, Stuart Frye
2010	J	`jnl`	Using Onboard Clustering to Summarize Remotely Sensed Imagery. IEEE Intell. Syst. David S. Hayden, Steve A. Chien, David R. Thompson, Rebecca Castaño
2010	—	`ch.`	Volcano Monitoring: A Case Study in Pervasive Computing. Pervasive Computing, Innovations in Intelligent Multimedia and Applications Nina M. Peterson, Lohith Anusuya-Rangappa, Behrooz A. Shirazi, Wen-Zhan Song, Renjie Huang, Daniel Tran, Steve A. Chien, Richard LaHusen
2009	—	`conf`	Onboard SVM analysis of Hyperion data to detect sulfur deposits in Arctic regions. WHISPERS Lukas Mandrake, Kiri L. Wagstaff, Damhnait Gleeson, Umaa Rebbapragada, Daniel Tran, Rebecca Castaño, Steve A. Chien, Robert T. Pappalardo
2009	J	`jnl`	Onboard Science Processing Concepts for the HyspIRI Mission. IEEE Intell. Syst. Steve A. Chien, Dorothy Silverman, Ashley Gerard Davies, Dan Mandl
2009	—	`conf`	Onboard classification of hyperspectral data on the Earth Observing One mission. WHISPERS Steve A. Chien, Daniel Tran, Steve R. Schaffer, Gregg R. Rabideau, Ashley Gerard Davies, Thomas Doggett, Ronald Greeley, Felipe Ip, Victor R. Baker, Joshua Doubleday, Rebecca Castaño, Daniel J. Mandl, Stuart Frye, Lawrence Ong, Francois Rogez, Bogdan Oaida
2009	—	`ch.`	Safe Agents in Space: Preventing and Responding to Anomalies in the Autonomous Sciencecraft Experiment. Safety and Security in Multiagent Systems Daniel Tran, Steve A. Chien, Gregg R. Rabideau, Benjamin Cichy
2008	—	`conf`	A Space-Based Sensor Web for Disaster Management. IGARSS (5) Daniel J. Mandl, Rob Sohlberg, Christopher Justice, Stephen G. Ungar, Troy J. Ames, Stuart Frye, Steve A. Chien, Daniel Tran, Pat Cappelaere, Don V. Sullivan, Vince Ambrosia
2008	J	`jnl`	Automatic detection of dust devils and clouds on Mars. Mach. Vis. Appl. Andres Castano, Alex Fukunaga, Jeffrey J. Biesiadecki, Lynn Neakrase, Patrick L. Whelley, Ronald Greeley, Mark T. Lemmon, Rebecca Castaño, Steve A. Chien
2007	C	`conf`	Experiments with user centric GEOSS architectures. IGARSS Daniel J. Mandl, Rob Sohlberg, Christopher Justice, Stephen G. Ungar, Troy J. Ames, Stuart Frye, Steve A. Chien, Pat Cappelaere, Danny Tran
2007	A*	`conf`	On-board analysis of uncalibrated data for a spacecraft at mars. KDD Rebecca Castaño, Kiri Wagstaff, Steve A. Chien, Timothy M. Stough, Benyang Tang
2006	—	`conf`	An Autonomous Earth Observing Sensorweb. SUTC (1) Steve A. Chien, Benjamin Cichy, Ashley Davies, Daniel Tran, Gregg R. Rabideau, Rebecca Castaño, Rob Sherwood, Son V. Nghiem, Ronald Greeley, Thomas Doggett, Victor R. Baker, James M. Dohm, Felipe Ip, Dan Mandl, Stuart Frye, Seth Shulman, Stephen G. Ungar, Thomas Brakke, Lawrence Ong, Jacques Descloitres, Jeremy Jones, Sandy Grosvenor, Rob Wright, Luke Flynn, Andy Harris, G. Robert Brakenridge, Sebastien Cacquard
2006	B	`conf`	Autonomous Detection of Dust Devils and Clouds on Mars. ICIP Andres Castano, Alex Fukunaga, Jeffrey J. Biesiadecki, Lynn Neakrase, Patrick L. Whelley, Ronald Greeley, Mark T. Lemmon, Rebecca Castaño, Steve A. Chien
2006	A*	`conf`	Integrated AI in Space: The Autonomous Sciencecraft on Earth Observing One. AAAI Steve A. Chien
2006	A*	`conf`	Onboard classifiers for science event detection on a remote sensing spacecraft. KDD Rebecca Castaño, Dominic Mazzoni, Nghia Tang, Ronald Greeley, Thomas Doggett, Benjamin Cichy, Steve A. Chien, Ashley Davies
2006	J	`jnl`	The Future of AI in Space. IEEE Intell. Syst. Steve A. Chien, Richard J. Doyle, Ashley Gerard Davies, Ari K. Jónsson, Ralph D. Lorenz
2005	J	`jnl`	An Autonomous Earth-Observing Sensorweb. IEEE Intell. Syst. Steve A. Chien, Benjamin Cichy, Ashley Davies, Daniel Tran, Gregg R. Rabideau, Rebecca Castaño, Rob Sherwood, Dan Mandl, Stuart Frye, Seth Shulman, Jeremy Jones, Sandy Grosvenor
2005	B	`conf`	An autonomous Earth observing sensorweb. SMC Steve A. Chien, Benjamin Cichy, Ashley Davies, Daniel Tran, Gregg R. Rabideau, Rebecca Castaño, Rob Sherwood, Son V. Nghiem, Ronald Greeley, Thomas Doggett, Victor R. Baker, James M. Dohm, Felipe Ip, Dan Mandl, Stuart Frye, Seth Shulman, Stephen G. Ungar, Thomas Brakke, Jacques Descloitres, Jeremy Jones, Sandy Grosvenor, Rob Wright, Luke Flynn, Andy Harris, G. Robert Brakenridge, Sebastien Cacquard
2005	A	`conf`	DEMO: the autonomous sciencecraft experiment onboard the EO-1 spacecraft. AAMAS Daniel Tran, Steve A. Chien, Rob Sherwood, Rebecca Castaño, Benjamin Cichy, Ashley Davies, Gregg R. Rabideau
2005	—	`conf`	Lessons learned from autonomous sciencecraft experiment. AAMAS Industrial Applications Steve A. Chien, Rob Sherwood, Daniel Tran, Benjamin Cichy, Gregg R. Rabideau, Rebecca Castaño, Ashley Davies, Dan Mandl, Stuart Frye, Bruce Trout, Jeff D'Agostino, Seth Shulman, Darrell Boyer, Sandra C. Hayden, Adam Sweet, Scott Christa
2005	A*	`conf`	Probabilistic Reasoning for Plan Robustness. IJCAI Steve R. Schaffer, Bradley J. Clement, Steve A. Chien
2005	B	`conf`	The autonomous sciencecraft embedded systems architecture. SMC Steve A. Chien, Rob Sherwood, Daniel Tran, Benjamin Cichy, Gregg R. Rabideau, Rebecca Castaño, Ashley Davies, Stuart Frye, Bruce Trout, Jeff D'Agostino, Seth Shulman, Dan Mandl, Darrell Boyer, Sandra C. Hayden, Adam Sweet, Scott Christa
2005	J	`jnl`	Using Autonomy Flight Software to Improve Science Return on Earth Observing One. J. Aerosp. Comput. Inf. Commun. Steve A. Chien, Rob Sherwood, Daniel Tran, Benjamin Cichy, Gregg R. Rabideau, Rebecca Castaño, Ashley Davies, Dan Mandl, Bruce Trout, Seth Shulman, Darrell Boyer
2004	—	`conf`	Safe Agents in Space: Lessons from the Autonomous Sciencecraft Experiment. Australian Conference on Artificial Intelligence Rob Sherwood, Steve A. Chien, Daniel Tran, Benjamin Cichy, Rebecca Castaño, Ashley Davies, Gregg R. Rabideau
2004	A*	`conf`	The Autonomous Sciencecraft Experiment Onboard the EO-1 Spacecraft. AAAI Daniel Tran, Steve A. Chien, Rob Sherwood, Rebecca Castaño, Benjamin Cichy, Ashley Davies, Gregg R. Rabideau
2004	A	`conf`	The Autonomous Sciencecraft Experiment Onboard the EO-1 Spacecraft. AAMAS Daniel Tran, Steve A. Chien, Rob Sherwood, Rebecca Castaño, Benjamin Cichy, Ashley Davies, Gregg R. Rabideau
2004	A	`conf`	The EO-1 Autonomous Science Agent. AAMAS Steve A. Chien, Rob Sherwood, Daniel Tran, Benjamin Cichy, Gregg R. Rabideau, Rebecca Castaño, Ashley Davies, Rachel Lee, Dan Mandl, Stuart Frye, Bruce Trout, Jerry Hengemihle, Jeff D'Agostino, Seth Shulman, Stephen G. Ungar, Thomas Brakke, Darrell Boyer, Jim Van Gaasbeck, Ronald Greeley, Thomas Doggett, Victor R. Baker, James M. Dohm, Felipe Ip
2002	—	`conf`	Autonomous Planning and Scheduling on the TechSat 21 Mission. Australian Joint Conference on Artificial Intelligence Rob Sherwood, Steve A. Chien, Rebecca Castaño, Gregg R. Rabideau
2002	J	`jnl`	Editorial Introduction: The Fifteenth Innovative Applications of Artificial Intelligence Conference (IAAI-2002). AI Mag. Steve A. Chien, John Riedl
2002	J	`jnl`	Editorial Introduction: The Fourteenth Innovative Applications of Artificial Intelligence Conference (IAAI-2001). AI Mag. Steve A. Chien, Haym Hirsh
2002	A	`conf`	The Techsat-21 autonomous space science agent. AAMAS Steve A. Chien, Rob Sherwood, Gregg R. Rabideau, Rebecca Castaño, Ashley Davies, Michael C. Burl, Russell Knight, Timothy M. Stough, Joseph Roden, Paul Zetocha, Ross H. Wainwright, Pete Klupar, Jim Van Gaasbeck, Pat Cappelaere, Dean Oswald
2001	Misc	`conf`	A Tool for Autonomous Ground-Based Rover Planning. FLAIRS Rob Sherwood, Andrew Mishkin, Tara A. Estlin, Steve A. Chien, Barbara Engelhardt, Brian K. Cooper, Gregg R. Rabideau
2001	A	`conf`	Autonomously generating operations sequences for a Mars rover using AI-based planning. IROS Rob Sherwood, Andrew Mishkin, Tara A. Estlin, Steve A. Chien, Paul G. Backes, Jeffrey S. Norris, Brian K. Cooper, Scott Maxwell, Gregg R. Rabideau
2001	A	`conf`	Balancing deliberation and reaction, planning and execution for space robotic applications. IROS Russell Knight, Forest Fisher, Tara A. Estlin, Barbara Engelhardt, Steve A. Chien
2001	J	`jnl`	Casper: Space Exploration through Continuous Planning. IEEE Intell. Syst. Russell Knight, Gregg R. Rabideau, Steve A. Chien, Barbara Engelhardt, Rob Sherwood
2001	Misc	`conf`	Goal-Directed Scientific Exploration Using Multiple Rovers. FLAIRS Tara A. Estlin, Rebecca Castaño, Ashley Davies, Darren Mutz, Gregg R. Rabideau, Steve A. Chien, Eric Mjolsness
2001	J	`jnl`	Hierarchical task network and operator-based planning: two complementary approaches to real-world planning. J. Exp. Theor. Artif. Intell. Tara A. Estlin, Steve A. Chien, Xuemei Wang
2001	J	`jnl`	Lessons Learned Deploying Space Planning Systems. Appl. Artif. Intell. Steve A. Chien, Tara A. Estlin, Forest Fisher, Gregg R. Rabideau
2001	C	`ed.`	Proceedings of the Thirteenth Innovative Applications of Artificial Intelligence Conference, August 7-9, 2001, Seattle, Washington, USA IAAI Haym Hirsh, Steve A. Chien
2000	—	`conf`	A comparison of coordinated planning methods for cooperating rovers. Agents Steve A. Chien, Anthony C. Barrett, Tara A. Estlin, Gregg R. Rabideau
2000	—	`conf`	An Empirical Evaluation of the Effectiveness of Local Search for Replanning. Local Search for Planning and Scheduling Steve A. Chien, Russell Knight, Gregg R. Rabideau
2000	J	`jnl`	Automated software module reconfiguration through the use of artificial intelligence planning techniques. IEE Proc. Softw. Steve A. Chien, Forest Fisher, Tara A. Estlin
2000	—	`conf`	Board-Laying Techniques Improve Local Search in Mixed Planning and Scheduling. Local Search for Planning and Scheduling Russell Knight, Gregg R. Rabideau, Steve A. Chien
2000	—	`conf`	Computing Valid Intervals for Collections of Activities with Shared States and Resources. AIPS Russell Knight, Gregg R. Rabideau, Steve A. Chien
2000	—	`conf`	Empirical Evaluation of Local Search Methods for Adapting Planning Policies in a Stochastic Environment. Local Search for Planning and Scheduling Barbara Engelhardt, Steve A. Chien
2000	—	`ed.`	Proceedings of the Fifth International Conference on Artificial Intelligence Planning Systems, Breckenridge, CO, USA, April 14-17, 2000 AIPS Steve A. Chien, Subbarao Kambhampati, Craig A. Knoblock
2000	J	`jnl`	The Fifth International Conference on Artificial Intelligence Planning and Scheduling. AI Mag. Anthony Barrett, Steve A. Chien
2000	—	`conf`	Using Generic Preferences to Incrementally Improve Plan Quality. AIPS Gregg R. Rabideau, Barbara Engelhardt, Steve A. Chien
2000	—	`conf`	Using Iterative Repair to Improve the Responsiveness of Planning and Scheduling. AIPS Steve A. Chien, Russell Knight, Andre Stechert, Rob Sherwood, Gregg R. Rabideau
1999	—	`conf`	An Integrated System for Multi-Rover Scientific Exploration. AAAI/IAAI Tara A. Estlin, Alexander G. Gray, Tobias Mann, Gregg R. Rabideau, Rebecca Castaño, Steve A. Chien, Eric Mjolsness
1999	A*	`conf`	Automated Planning and Scheduling for Planetary Rover Distributed Operations. ICRA Paul G. Backes, Gregg R. Rabideau, Kam S. Tso, Steve A. Chien
1999	A*	`conf`	Automated Planning for a Deep Space Communications Station. ICRA Tara A. Estlin, Forest Fisher, Darren Mutz, Steve A. Chien
1999	J	`jnl`	Automating Planning and Scheduling of Shuttle Payload Operations. Artif. Intell. Steve A. Chien, Gregg R. Rabideau, Jason Willis, Tobias Mann
1999	J	`jnl`	Efficient Heuristic Hypothesis Ranking. J. Artif. Intell. Res. Steve A. Chien, Andre Stechert, Darren Mutz
1999	Misc	`conf`	SAR Image Processing Using Artificial Intelligence Planning. ICIAP Forest Fisher, Steve A. Chien, Edisanter Lo, Ronald Greeley
1999	—	`conf`	Using Artificial Intelligence Planning to Generate Antenna Tracking Plans. AAAI/IAAI Forest Fisher, Tara A. Estlin, Darren Mutz, Steve A. Chien
1999	—	`conf`	Using Iterative Repair to Automate Planning and Scheduling of Shuttle Payload Operations. AAAI/IAAI Gregg R. Rabideau, Steve A. Chien, Jason Willis, Tobias Mann
1999	J	`jnl`	Using artificial intelligence planning to automate science image data analysis. Intell. Data Anal. Steve A. Chien, Forest Fisher, Edisanter Lo, Helen Mortensen, Ronald Greeley
1998	J	`jnl`	An Autonomous Spacecraft Agent Prototype. Auton. Robots Barney Pell, Douglas E. Bernard, Steve A. Chien, Erann Gat, Nicola Muscettola, P. Pandurang Nayak, Michael D. Wagner, Brian C. Williams
1998	J	`jnl`	Automated Planning and Scheduling for Goal-Based Autonomous Spacecraft. IEEE Intell. Syst. Steve A. Chien, Nicola Muscettola, Kanna Rajan, Benjamin D. Smith, Gregg R. Rabideau
1998	J	`jnl`	Static and completion analysis for knowledge acquisition, validation and maintenance of planning knowledge bases. Int. J. Hum. Comput. Stud. Steve A. Chien
1998	—	`conf`	Using Artificial Intelligence Planning Techniques to Automatically Reconfigure Software Modules. IEA/AIE (Vol. 2) Steve A. Chien, Forest Fisher, Helen Mortensen, Edisanter Lo, Ronald Greeley, Anita Govindjee, Tara A. Estlin, Xuemei Wang
1998	—	`conf`	Using Artificial Intelligence Planning to Automate SAR Image Processing for Scientific Data Analysis. AAAI/IAAI Forest Fisher, Steve A. Chien, Edisanter Lo, Ronald Greeley
1997	A*	`conf`	A hierarchical architecture for resource allocation, plan execution, and revision for operation of a network of communications antennas. ICRA Steve A. Chien, Randall W. Hill Jr., Anita Govindjee, Xuemei Wang, Tara A. Estlin, M. A. Griesel, Roberto Lam, Kristina V. Fayyad
1997	—	`conf`	An Argument for a Hybrid HTN/Operator-Based Approach to Planning. ECP Tara A. Estlin, Steve A. Chien, Xuemei Wang
1997	—	`conf`	An Autnomous Spacecarft Agent Prototype. Agents Barney Pell, Douglas E. Bernard, Steve A. Chien, Erann Gat, Nicola Muscettola, P. Pandurang Nayak, Michael D. Wagner, Brian C. Williams
1997	—	`conf`	Automated Generation of Tracking Plans for a Network of Communications Antennas. AAAI/IAAI Steve A. Chien, Anita Govindjee, Tara A. Estlin, Xuemei Wang, Randall W. Hill Jr.
1997	J	`jnl`	Making an Impact: Artificial Intelligence at the Jet Propulsion Laboratory. AI Mag. Steve A. Chien, Dennis DeCoste, Richard J. Doyle, Paul E. Stolorz
1997	—	`conf`	On Efficient Heuristic Ranking of Hypotheses. NIPS Steve A. Chien, Andre Stechert, Darren Mutz
1997	—	`conf`	Replanning Using Hierarchical Task Network and Operator-Based Planning. ECP Xuemei Wang, Steve A. Chien
1997	A*	`conf`	Using Artificial Intelligence Planning to Automate Science Data Analysis for Large Image Databases. KDD Steve A. Chien, Forest Fisher, Helen Mortensen, Edisanter Lo, Ronald Greeley
1996	J	`jnl`	Adaptive Problem-solving for Large-scale Scheduling Problems: A Case Study CoRR Jonathan Gratch, Steve A. Chien
1996	J	`jnl`	Adaptive Problem-solving for Large-scale Scheduling Problems: A Case Study. J. Artif. Intell. Res. Jonathan Gratch, Steve A. Chien
1996	J	`jnl`	Automating Image Processing for Scientific Data Analysis of a Large Image Database. IEEE Trans. Pattern Anal. Mach. Intell. Steve A. Chien, Helen Mortensen
1996	B	`conf`	Intelligent Tools for Planning Knowledge Base Development and Verification. EKAW Steve A. Chien
1996	—	`conf`	Static and Completion Analysis for Planning Knowledge Base Development and Verification. AIPS Steve A. Chien
1995	J	`jnl`	On the Efficient Allocation of Resources for Hypothesis Evaluation: A Statistical Approach. IEEE Trans. Pattern Anal. Mach. Intell. Steve A. Chien, Jonathan Gratch, Michael C. Burl
1995	J	`jnl`	Review of Intelligent Scheduling. AI Mag. Steve A. Chien
1995	C	`conf`	The Multimission VICAR Planner: Automated Image Processing for Scientific Data Analysis. IAAI Steve A. Chien, Helen Mortensen
1994	—	`conf`	Automated Synthesis of Image Processing Procedures for a Large-Scale Image Database. ICIP (3) Steve A. Chien
1994	—	`conf`	Constructing Simplified Plans Via Truth Criteria Approximation. AIPS Steve A. Chien, Gerald DeJong
1994	A*	`conf`	Improving Learning Performance Through Rational Resource Allocation. AAAI Jonathan Gratch, Steve A. Chien, Gerald DeJong
1994	—	`conf`	Producing Satisficing Solutions to Scheduling Problems: An Interactive Constraint Relaxation Approach. AIPS Steve A. Chien, Jonathan Gratch
1994	—	`conf`	Using AI Planning Techniques to Automatically Generate Image Processing Procedures. AIPS Steve A. Chien
1993	A*	`conf`	Learning Search Control Knowledge for Deep Space Network Scheduling. ICML Jonathan Gratch, Steve A. Chien, Gerald DeJong
1991	—	`—`	An explanation-based learning approach to incremental planning Steve A. Chien
1991	—	`conf`	Machine Learning in Engineering Automation. ML Steve A. Chien, Bradley L. Whitehall, Thomas G. Dietterich, Richard J. Doyle, Brian Falkenhainer, James Garrett, Stephen C. Y. Lu
1991	—	`conf`	On Becoming Decreasingly Reactive: Learning to Deliberate Minimally. ML Steve A. Chien, Melinda T. Gervasio, Gerald DeJong
1989	—	`conf`	Learning by Analyzing Fortuitous Occurrences. ML Steve A. Chien
1989	A*	`conf`	Using and Refining Simplifications: Explanation-Based Learning of Plans in Intractable Domains. IJCAI Steve A. Chien