A planar XY robotic fine positioning device. - Ralph L. Hollis (ICRA, 1985)

Precise Manipulation with Endpoint Sensing. - Russell H. Taylor; Ralph L. Hollis; Mark A. Lavin (IBM J. Res. Dev., 1985)

Sensors for robotic assembly. - Andrew E. Brennemann; Ralph L. Hollis; Mark A. Lavin; Bela L. Musits (ICRA, 1988)

A magnetically levitated fine motion wrist: kinematics, dynamics and control. - Septimiu E. Salcudean; Ralph L. Hollis (ICRA, 1988)

A vision based correlator to actively damp vibrations of a coarse-fine manipulator. - T. E. Weber; Ralph L. Hollis (ICRA, 1989)

A six-degree-of-freedom magnetically levitated variable compliance fine-motion wrist: design, modeling, and control. - Ralph L. Hollis; Septimiu E. Salcudean; A. Peter Allan (IEEE Trans. Robotics Autom., 1991)

Design and control of an air-bearing supported three degree-of-freedom fine positioner. - Robert Hammer; Ralph L. Hollis; C. H. An; F. Henriks (ICRA, 1992)

Real and virtual coarse-fine robot bracing strategies for precision assembly. - Ralph L. Hollis; Robert Hammer (ICRA, 1992)

A force-reflecting teleoperation system with magnetically levitated master and wrist. - Septimiu E. Salcudean; N. M. Wong; Ralph L. Hollis (ICRA, 1992)

Precision Assembly with a Magnetically Levitated Wrist. - Sang-Rok Oh; Ralph L. Hollis; Septimiu E. Salcudean (ICRA (1), 1993)

Accurate Alignment of Laminate Materials Using Sensor-Based Robot Techniques. - Andrew E. Brennemann; Robert Hammer; Ralph L. Hollis; William V. Jecusco II (ICRA, 1994)

Interacting with virtual environments using a magnetic levitation haptic interface. - Peter J. Berkelman; Ralph L. Hollis; Septimiu E. Salcudean (IROS (1), 1995)

Magnetic and optical-fluorescence position sensing for planar linear motors. - Andrew E. Brennemann; Ralph L. Hollis (IROS (3), 1995)

Sensor based registration and stacking of electronic substrate layers. - Andrew E. Brennemann; Robert Hammer; William V. Jecusco II; Ralph L. Hollis (IEEE Robotics Autom. Mag., 1995)

Design and control of a force-reflecting teleoperation system with magnetically levitated master and wrist. - Septimiu E. Salcudean; N. M. Wong; Ralph L. Hollis (IEEE Trans. Robotics Autom., 1995)

Cooperative 2-DOF robots for precision assembly. - Arthur E. Quaid; Ralph L. Hollis (ICRA, 1996)

Vision-based visual/haptic registration for WYSIWYF display. - Yasuyoshi Yokokohji; Ralph L. Hollis; Takeo Kanade (IROS, 1996)

What You Can See is What You Can Feel - Development of Visual/Haptic Interface to Virtual Environment. - Yasuyoshi Yokokohji; Ralph L. Hollis; Takeo Kanade (VRAIS, 1996)

Force characterization and commutation of planar linear motors. - Arthur E. Quaid; Yangsheng Xu; Ralph L. Hollis (ICRA, 1997)

Agile assembly architecture: an agent based approach to modular precision assembly systems. - Alfred A. Rizzi; Jay Gowdy; Ralph L. Hollis (ICRA, 1997)

Integrated Precision 3-DOF Position Sensor for Planar Linear Motors. - Zack J. Butler; Alfred A. Rizzi; Ralph L. Hollis (ICRA, 1998)

3-DOF Closed-Loop Control for Planar Linear Motors. - Arthur E. Quaid; Ralph L. Hollis (ICRA, 1998)

Interaction with a Realtime Dynamic Environment Simulation Using a Magnetic Levitation Haptic Interface Device. - Peter J. Berkelman; Ralph L. Hollis; David Baraff (ICRA, 1999)

Fluorescent Dye Based Optical Position Sensing for Planar Linear Motors. - Gregory A. Fries; Alfred A. Rizzi; Ralph L. Hollis (ICRA, 1999)

WYSIWYF Display: A Visual/Haptic Interface to Virtual Environment. - Yasuyoshi Yokokohji; Ralph L. Hollis; Takeo Kanade (Presence Teleoperators Virtual Environ., 1999)

Cooperative Coverage of Rectilinear Environments. - Zack J. Butler; Alfred A. Rizzi; Ralph L. Hollis (ICRA, 2000)

Visually Guided Coordination for Distributed Precision Assembly. - Michael L. Chen; Shinji Kume; Alfred A. Rizzi; Ralph L. Hollis (ICRA, 2000)

Optical Coordination Sensor for Precision Cooperating Robots. - Wing-Choi Ma; Alfred A. Rizzi; Ralph L. Hollis (ICRA, 2000)

Simulation and Experimental Evaluation of Complete Sensor-Based Coverage in Rectilinear Environments. - Zack J. Butler; Alfred A. Rizzi; Ralph L. Hollis (ISER, 2000)

Force-Based Interaction for Distributed Precision Assembly. - Richard T. DeLuca; Alfred A. Rizzi; Ralph L. Hollis (ISER, 2000)

Lorentz Magnetic Levitation for Haptic Interaction: Device Design, Performance, and Integration with Physical Simulations. - Peter J. Berkelman; Ralph L. Hollis (Int. J. Robotics Res., 2000)

A precision manipulator module for assembly in a minifactory environment. - H. Benjamin Brown; Patrick M. Muir; Alfred A. Rizzi; Maria C. Sensi; Ralph L. Hollis (IROS, 2001)

Comparison of 3-D haptic peg-in-hole tasks in real and virtual environments. - Bertram J. Unger; A. Nicolaidis; Peter J. Berkelman; A. Thompson; Roberta L. Klatzky; Ralph L. Hollis (IROS, 2001)

Distributed Coordination in Modular Precision Assembly Systems. - Alfred A. Rizzi; Jay Gowdy; Ralph L. Hollis (Int. J. Robotics Res., 2001)

Virtual Peg-in-Hole Performance Using a 6-DOF Magnetic Levitation Haptic Device: Comparison with Real Forces and with Visual Guidance Alone. - Bertram J. Unger; A. Nicolaidis; Peter J. Berkelman; A. Thompson; Susan J. Lederman; Roberta L. Klatzky; Ralph L. Hollis (Symposium on Haptic Interfaces for Virtual Environment and Teleoperator Systems, 2002)

A telemanipulation system for psychophysical investigation of haptic interaction. - Bertram J. Unger; Roberta L. Klatzky; Ralph L. Hollis (ICRA, 2003)

Free-roaming Planar Motors: Toward Autonomous Precision Planar Mobile Robots. - Tom Lauwers; Zack K. Edmondson; Ralph L. Hollis (ICRA, 2004)

Design and Operation of a Force-reflecting Magnetic Levitation Coarse-fine Teleoperation System. - Bertram J. Unger; Ralph L. Hollis (ICRA, 2004)

One Is Enough!. - Tom Lauwers; George Kantor; Ralph L. Hollis (ISRR, 2005)

A Dynamically Stable Single-wheeled Mobile Robot with Inverse Mouse-ball Drive. - Tom Lauwers; George Kantor; Ralph L. Hollis (ICRA, 2006)

JND Analysis of Texture Roughness Perception using a Magnetic Levitation Haptic Device. - Bertram J. Unger; Ralph L. Hollis; Roberta L. Klatzky (WHC, 2007)

The Geometric Model for Perceived Roughness Applies to Virtual Textures. - Bertram J. Unger; Ralph L. Hollis; Roberta L. Klatzky (HAPTICS, 2008)

Haptic Rendering and Psychophysical Evaluation of a Virtual Three-Dimensional Helical Spring. - Vinithra Varadharajan; Roberta L. Klatzky; Bertram J. Unger; Robert H. Swendsen; Ralph L. Hollis (HAPTICS, 2008)

Maglev haptics: butterfly haptic's new user interface technology. - Ralph L. Hollis (SIGGRAPH New Tech Demos, 2008)

Good vibrations: Asymmetric vibrations for directional haptic cues. - Hanns Tappeiner; Roberta L. Klatzky; Bertram J. Unger; Ralph L. Hollis (WHC, 2009)

Human-robot physical interaction with dynamically stable mobile robots. - Umashankar Nagarajan; George Kantor; Ralph L. Hollis (HRI, 2009)

Trajectory planning and control of an underactuated dynamically stable single spherical wheeled mobile robot. - Umashankar Nagarajan; George Kantor; Ralph L. Hollis (ICRA, 2009)

State transition, balancing, station keeping, and yaw control for a dynamically stable single spherical wheel mobile robot. - Umashankar Nagarajan; Anish Mampetta; George Kantor; Ralph L. Hollis (ICRA, 2009)

Remote haptic feedback from a dynamic running machine. - Hanns Tappeiner; Sarjoun Skaff; Tomas Szabo; Ralph L. Hollis (ICRA, 2009)

Hybrid control for navigation of shape-accelerated underactuated balancing systems. - Umashankar Nagarajan; George Kantor; Ralph L. Hollis (CDC, 2010)

Development of a three-dimensional ball rotation sensing system using optical mouse sensors. - Masaaki Kumagai; Ralph L. Hollis (ICRA, 2011)

Hand-Held Force Magnifier for Surgical Instruments. - George D. Stetten; Bing Wu 005; Roberta L. Klatzky; John M. Galeotti; Mel W. Siegel; Randy Lee; Francis Mah; Andrew Eller; Joel S. Schuman; Ralph L. Hollis (IPCAI, 2011)

Roughness Perception in Virtual Textures. - Bertram J. Unger; Ralph L. Hollis; Roberta L. Klatzky (IEEE Trans. Haptics, 2011)

Force, Torque, and Stiffness: Interactions in Perceptual Discrimination. - Bing Wu 005; Roberta L. Klatzky; Ralph L. Hollis (IEEE Trans. Haptics, 2011)

Development and control of a three DOF planar induction motor. - Masaaki Kumagai; Ralph L. Hollis (ICRA, 2012)

Planning in high-dimensional shape space for a single-wheeled balancing mobile robot with arms. - Umashankar Nagarajan; Byungjun Kim; Ralph L. Hollis (ICRA, 2012)

Integrated planning and control for graceful navigation of shape-accelerated underactuated balancing mobile robots. - Umashankar Nagarajan; George Kantor; Ralph L. Hollis (ICRA, 2012)

Hand-Held Force Magnifier for Surgical Instruments: Evolution toward a Clinical Device. - Randy Lee; Bing Wu 005; Roberta L. Klatzky; Vikas Shivaprabhu; John M. Galeotti; Samantha Horvath; Mel W. Siegel; Joel S. Schuman; Ralph L. Hollis; George D. Stetten (AE-CAI, 2012)

Development and control of a three DOF spherical induction motor. - Masaaki Kumagai; Ralph L. Hollis (ICRA, 2013)

Differentially flat trajectory generation for a dynamically stable mobile robot. - Michael Shomin; Ralph L. Hollis (ICRA, 2013)

Bimanual haptic teleoperation for discovering and uncovering buried objects. - Hanns Tappeiner; Roberta L. Klatzky; Patrick Rowe; Jorgen Pedersen; Ralph L. Hollis (ICRA, 2013)

Shape space planner for shape-accelerated balancing mobile robots. - Umashankar Nagarajan; Ralph L. Hollis (Int. J. Robotics Res., 2013)

Integrated motion planning and control for graceful balancing mobile robots. - Umashankar Nagarajan; George Kantor; Ralph L. Hollis (Int. J. Robotics Res., 2013)

The Physical Basis of Perceived Roughness in Virtual Sinusoidal Textures. - Bertram J. Unger; Roberta L. Klatzky; Ralph L. Hollis (IEEE Trans. Haptics, 2013)

Human-approaching trajectories for a person-sized balancing robot. - Michael Shomin; Bhaskar Vaidya; Ralph L. Hollis; Jodi Forlizzi (ARSO, 2014)

Fast, dynamic trajectory planning for a dynamically stable mobile robot. - Michael Shomin; Ralph L. Hollis (IROS, 2014)

The ballbot: An omnidirectional balancing mobile robot. - Umashankar Nagarajan; George Kantor; Ralph L. Hollis (Int. J. Robotics Res., 2014)

Six-stator spherical induction motor for balancing mobile robots. - Ankit Bhatia; Masaaki Kumagai; Ralph L. Hollis (ICRA, 2015)

Sit-to-stand assistance with a balancing mobile robot. - Michael Shomin; Jodi Forlizzi; Ralph L. Hollis (ICRA, 2015)

Operation of the ballbot on slopes and with center-of-mass offsets. - Bhaskar Vaidya; Michael Shomin; Ralph L. Hollis; George Kantor (ICRA, 2015)

Psychophysical Evaluation of Haptic Perception Under Augmentation by a Handheld Device. - Bing Wu 005; Roberta L. Klatzky; Randy Lee; Vikas Shivaprabhu; John M. Galeotti; Mel W. Siegel; Joel S. Schuman; Ralph L. Hollis; George D. Stetten (Hum. Factors, 2015)

Initial results for a ballbot driven with a spherical induction motor. - Greg Seyfarth; Ankit Bhatia; Olaf Sassnick; Michael Shomin; Masaaki Kumagai; Ralph L. Hollis (ICRA, 2016)

Electromagnetic tracker for active handheld robotic systems. - Robert A. MacLachlan; Nicholas Parody; Shohin Mukherjee; Ralph L. Hollis; Cameron N. Riviere; Joseph N. Martel; Louis A. Lobes Jr. (IEEE SENSORS, 2016)

A 2-DOF manipulator for micro-assembly in a minifactory. - Jun Zhang; Ralph L. Hollis (ROBIO, 2016)

Toward Improved Electromagnetic Tracking for Handheld Robotics. - Robert A. MacLachlan; Ralph L. Hollis; Joseph N. Martel; Louis A. Lobes Jr.; Cameron N. Riviere (ICMRE, 2017)

Multirate Kalman filter rejects impulse noise in frequency-domain-multiplexed tracker measurements. - Robert A. MacLachlan; Ralph L. Hollis; Branislav Jaramaz; Cameron N. Riviere; Joseph N. Martel; Kenneth L. Urish (IEEE SENSORS, 2017)

Development of a Humanoid Dual Arm System for a Single Spherical Wheeled Balancing Mobile Robot. - Roberto Shu; Ralph L. Hollis (Humanoids, 2019)

The Mechanics and Control of Leaning to Lift Heavy Objects with a Dynamically Stable Mobile Robot. - Fabian Sonnleitner; Roberto Shu; Ralph L. Hollis (ICRA, 2019)

Momentum based Whole-Body Optimal Planning for a Single-Spherical-Wheeled Balancing Mobile Manipulator. - Roberto Shu; Ralph L. Hollis (IROS, 2021)