Flexible Research Group's Publications

Book Contributions, Editorial Publications, Journal Publications, Archived Preprint Publications, Published Report Contributions, Published Conference Papers, Conference Abstracts, Theses Published from Group and Wikipedia Articles Published About Our Group's Work are provided here. Click on the references you are interested in viewing, and you will be directed to the appropriate websites where you can access the desired manuscripts.

Book Contributions

2014

[2] Duoss, E., Zhu, C., Sullivan, K., Vericella, J., Hopkins, J.B., Zheng, R., Pascall, A., Weisgraber, T., Deotte, J., Frank, J., Lee, H., Kolesky, D., Lewis, J., Tortorelli, D., Saintillan, D., Fang, N., Kuntz, J., Spadaccini, C., 2014, “Part I Reliable Manufacturing with Advanced Materials: Additive Micro-Manufacturing of Designer Materials,” (pp. 13-24) in Materials Challenges and Testing for Manufacturing, Mobility, Biomedical Applications and Climate, Edited by Udomkichdecha, W., Bollinghaus, T., Manonukul, A., Lexow, J., Springer, Cham, Switzerland.

2013 (The year our group started at UCLA)

[1] Hopkins, J.B., 2013, “Chapter 6: Synthesis Through Freedom and Constraint Topologies,” (pp. 79-92) in Handbook of Compliant Mechanisms, Edited by Howell, L.L., Magleby, S.P., Olsen, B.M., John Wiley & Sons Ltd, Oxford, UK.

Editorial

Journal Publications

Editorial Publications

2024

[2] Berselli, G., Catalano, M., Frecker, M., Herder, J.L., Hopkins, J.B., 2024, “Guest Editorial: Focused Section on Compliant Mechanisms for Mechatronics,” IEEE/ASME Transactions on Mechatronics, 29(2): pp. 807-809.

2023

[1] Zadpoor, A.A., Mirzaali, M.J., Valdevit, L., Hopkins, J.B., 2023, “Design, Material, Function, and Fabrication of Metamaterials,” APL Materials, 11(2): 020401 (9 pages).

Journal Publications

2024

[72] Taylor, C.R., Flanagan, W., Jones, T.H., Lim, H.K., Hopkins, J.B., Clites, T.R., “Metamorphic Flexure Bearings for Extended Range of Motion,” submitted to Journal of Mechanical Design, October 2024.

[71] Liang, H., Yang, Z., Zhang, L., Luo, B., Liu, H., Li, L., Hopkins, J.B., Hao, G., “The Design of Spatial Compliant Mechanisms with Distributed Multi-stability Based on Post-buckled Cylindrical Compliant Beams,” submitted to Mechanical Systems and Signal Processing, September 2024.

[70] Yang, Z., Weida, J.L., Shao, S., Reedel, B., Shannon, C., Chen, J., Sheth, P., Hopkins, J.B., “Preventing Pressure Ulcers by Increasing Pressure: An Unorthodox Alternating-pressure Mattress,” submitted to Science Robotics, August 2024.

[69] Alu, A., Arietta, A.F., Sarles, S.A., Dickey, M., Ferracin, S., He, Q., Raney, J.R., Reis, P.M., Ubamanyu, U.K., van Hecke, M., Hyatt, L.P., Harne, R., Hauser, H., Hopkins, J.B., Dottore, E.D., Mariani, S., Mondini, A., Mazzolai, B., Pal, A., Sitti, M., Rajappan, A., Preston, D.J., Li, S., Wang, K-W., “Roadmap on Embodying Mechano-intelligence and Computing in Functional Materials and Structures,” submitted to Smart Materials and Structures, April 2024.

[68] Vazzoler, G., Shimohara, S., Berselli, G., Hopkins, J.B., 2024, “Designing Multi-axis Compliant Mechanisms with Lockable Decoupled Inputs: A Tip-tilt Case Study,” Journal of Mechanisms and Robotics, 17(4): 044507 (10 pages) (submitted by invitation to the special issue on Selected Papers from IDETC 2024).

[67] Yan, W., Jones, T., Jawetz, C., Lee, R.H., Hopkins, J.B., Mehta, A., 2024, “Self-deployable Contracting-cord Metamaterials with Tunable Mechanical Properties,” Materials Horizons, 11(16): pp. 3805-3818 (an image of the research is featured on the back cover of the Materials Horizons issue).

[66] Chen., J., Miao, X., Ma, H., Hopkins, J.B., Huang, G., 2024, “Intelligent Mechanical Metamaterials Toward Learning Static and Dynamic Behaviors,” Materials & Design, 244: 113093 (11 pages).

[65] Archer, N.C., Hopkins, J.B., 2024, “Analysis and Synthesis of Interconnected Hybrid Mechanisms Using Freedom and Constraint Topologies (FACT),” Mechanism and Machine Theory, 200: 105722 (26 pages).

[64] McCullough, J.A., Peterson, B.T., Upfill-Brown, A.M., Hardin, T.J., Hopkins, J.B., SooHoo, N.F., Clites, T.R., 2024, “Compliant Intramedullary Stems for Joint Reconstruction,” IEEE Journal of Translational Engineering in Health & Medicine, 12: pp. 314-327.

[63] Peterson, B.T., Hardin, T.J., Pomeroy, A.W., Hopkins, J.B., Clites, T.R., 2024, “Cross Axis Flexural Pivots in Mechatronic Applications: Stress Based Design for Combined Tension and Bending,” IEEE/ASME Transactions on Mechatronics, 29(2): pp. 913-923.

2023

[62] Luo, C., Hopkins, J.B., Cullinan, M.A., 2023, “Response Speed Characterization of a Thermally Actuated Programmable Metamaterial,” Journal of Microelectromechanical Systems, 33(1): pp. 6-8.

[61] Archer, N.C., Hopkins, J.B., 2023, “Large-range Rotation-to-translation Compliant Transmission Mechanism,” Journal of Mechanical Design, 145(12): 125001 (8 pages).

[60] Lee, R.H., Sainaghi, P., Hopkins, J.B., 2023, “Comparing Mechanical Neural-network Learning Algorithms,” Journal of Mechanical Design, 145(7): 071704 (7 pages).

[59] Archer, N.C., Hopkins, J.B., 2023, “Numerical Determination of Freedom Spaces from Any Set of Twists,” Mechanism and Machine Theory, 185: 105255 (24 pages).

[58] McCarthy, B., Nail, E., Nagarajan, A., McCullough, J., Hopkins, J.B., 2023, “Design of Configuration Indifferent Compliant Building Blocks,” Precision Engineering, 81: pp. 60-67.

[57] Hopkins, J.B., Lee, R.H., Sainaghi, P., 2023, “Using Binary-stiffness Beams within Mechanical Neural-network Metamaterials to Learn,” Smart Materials and Structures, 32(3): 035015 (10 pages) (submitted by invitation of the journal’s Editorial Board to contribute to its ‘Emerging Leaders Collection’ to be considered for the journal’s Early Career Award).

2022

[56] Shimohara, S., Lee, R.H., Hopkins, J.B., 2022, “Compliant Mechanisms that Achieve Binary Stiffness Along Multiple Degrees of Freedom,” Journal of Composite Materials, DOI: 10.1177/00219983221146262, pp. 1-13 (submitted by invitation to the AFOSR special issue on “Multifunctional Composites for Autonomic, Adaptive and Self-Sustaining Systems”).

[55] Lee, R.H., Mulder, E.A.B., Hopkins, J.B., 2022, “Mechanical Neural Networks: Architected Materials that Learn Behaviors,” Science Robotics, 7(71): pp. 1-9.

[54] Yang, Z., Lee, R., Hopkins, J.B., 2022, “Hexblade Positioner: A Fast Large-range Six-axis Motion Stage,” Precision Engineering, 76: pp. 199-207.

[53] Farzaneh, A., Pawar, N., Portela, C.M., Hopkins, J.B., 2022, “Sequential Metamaterials with Alternating Poisson's Ratios,” Nature Communications, 13(1): 1041 (9 pages).

2021

[52] Panas, R.M., Sun, F., Bekker, L., Hopkins, J.B., 2021, “Combining Cross-pivot Flexures to Generate Improved Kinematically Equivalent Flexure Systems,” Precision Engineering, 72: pp. 237-249.

[51] Kuppens, P.R., Bessa, M.A., Herder, J.L., Hopkins, J.B., 2021, “Compliant Mechanisms that use Static Balancing to Achieve Dramatically Different States of Stiffness,” Journal of Mechanisms and Robotics, .13(2): 021010 (6 pages).

[50] Behera, D., Chizari, S., Shaw, L.A., Porter, M., Hensleigh, R., Xu, Z., Zheng, X., Connolly, L.G., Roy, N.K., Panas, R.M., Saha, S.K., Zheng, X., Hopkins, J.B., Chen, S-C., Cullinan, M.A., 2021, “Current Challenges and Potential Directions Towards Precision Microscale Additive Manufacturing—Part IV: Future Perspectives,” Precision Engineering, 68: pp. 197-205.

[49] Chizari, S., Shaw, L.A., Behera, D., Roy, N.K., Zheng, X., Panas, R.M., Hopkins, J.B., Chen, S-C., Cullinan, M.A., 2021, “Current Challenges and Potential Directions Towards Precision Microscale Additive Manufacturing—Part III: Energy Induced Deposition and Hybrid Electrochemical Processes,” Precision Engineering, 68: pp. 174-186.

[48] Behera, D., Chizari, S., Shaw, L.A., Porter, M., Hensleigh, R., Xu, Z., Roy, N.K., Connolly, L.G., Zheng, X., Saha, S.K., Hopkins, J.B., Cullinan, M.A., 2021 “Current Challenges and Potential Directions Towards Precision Microscale Additive Manufacturing—Part II: Laser-based Trapping, Curing, and Heating Processes,” Precision Engineering, 68: pp. 301-318.

[47] Kuppens, P.R., Bessa, M.A., Herder, J.L., Hopkins, J.B., 2021, “Monolithic Binary Stiffness Building Blocks for Mechanical Digital Machines,” Extreme Mechanics Letters, 42: 101120 (10 pages).

2020

[46] Chizari, S., Udani, S., Farzaneh, A., Stoecklein, D., Di Carlo, D., Hopkins, J.B., 2020, “Scanning Two-photon Continuous Flow Lithography for the Fabrication of Multi-functional Microparticles,” Optics Express, 28(26): pp. 40088-40098.

[45] Chizari, S., Lim, M.P., Shaw, L.A., Austin, S.P., Hopkins, J.B., 2020, “Automated Optical-tweezers Assembly of Engineered Microgranular Crystals,” Small, 16(25): 2000314 (6 pages).

[44] Ng, J., Jones, T.H., Martinez-Velis, I., Hopkins, J.B., Wang, A., Xie, Y-H., 2020, “Effects of Polymer Residue on the Pull-in of Suspended Graphene,” Journal of Vacuum Science and Technology B, 38(2): 023001 (10 pages).

[43] Luo, C., Song, Y., Zhao, C., Thirumalai, S., Ladner, I., Cullinan, M.A., Hopkins, J.B., 2020, “Design and Fabrication of a Three-dimensional Meso-sized Robotic Metamaterial with Actively Controlled Properties,” Materials Horizons, 7(1): pp. 229-235.

2019

[42] Poon, R., Hopkins, J.B., 2019, “Phase-changing Metamaterial Capable of Variable Stiffness and Shape Morphing,” Advanced Engineering Materials, 21(12): 1900802 (5 pages) (selected by the editor to be featured in Advanced Science News).

[41] Kochmann, D.M., Hopkins, J.B., Valdevit, L., 2019, “Multiscale Modeling and Optimization of the Mechanics of Hierarchical Metamaterials,” MRS Bulletin , 44(10): pp. 773-781.

[40] Song, Y., Panas, R.M., Chizari, S., Shaw, L.A., Mancini, J.A., Hopkins, J.B., Pascall, A.J., 2019, “Additively Manufacturable Micro-Mechanical Logic Gates,” Nature Communications, 10: 882 (6 pages).

[39] Chizari, S., Shaw, L.A., Hopkins, J.B., 2019, “Simultaneous Printing and Deformation of Microsystems via Two-Photon Lithography and Holographic Optical Tweezers,” Materials Horizons, 6(2): pp. 350-355.

[38] Shaw, L.A., Sun, F., Portela, C.M., Barranco, R.I., Greer, J.R., Hopkins, J.B., 2019, “Computationally Efficient Design of Directionally Compliant Metamaterials,” Nature Communications, 10: 291 (13 pages).

2018

[37] Shaw, L.A., Chizari, S., Dotson, M.B., Song, Y., Hopkins, J.B., 2018, “Compliant Rolling-contact Architected Materials for Shape Reconfigurability,” Nature Communications, 9: 4594 (12 pages).

[36] Delissen, A., Radaelli, G., Shaw, L.A., Hopkins, J.B., Herder, J.L., 2018, “Design of an Isotropic Metamaterial with Constant Stiffness and Zero Poisson’s Ratio over Large Deformations,” Journal of Mechanical Design, 140(11): 111405 (10 pages).

[35] Porter, M.D., Giera, B., Panas, R.M., Shaw, L.A., Shusteff, M., Hopkins, J.B., 2018 “Experimental Characterization and Modeling of Optical Tweezer Particle Handling Dynamics,” Applied Optics, 57(22): pp. 6565-6571.

[34] Shaw, L.A., Chizari, S., Hopkins, J.B., 2018, “Improving the Throughput of Automated Holographic Optical Tweezers,” Applied Optics, 57(22): pp. 6396-6402.

[33] Shaw, L.A., Chizari, S., Shusteff, M., Naghshi-Nilchi, H., Di Carlo, D., Hopkins, J.B., 2018, “Scanning Two-photon Continuous Flow Lithography for Synthesis of High-resolution 3D Microparticles,” Optics Express, 26(10): pp. 13543-13548.

[32] Hatamizadeh, A., Song, Y., Hopkins, J.B., 2018, “Optimizing the Geometry of Flexure System Topologies Using the Boundary Learning Optimization Tool (BLOT),” Mathematical Problems in Engineering, Volume 2018, Article ID 1058732, (14 pages).

[31] Song, Y., Panas, R.M., Hopkins, J.B., 2018, “A Review of Micromirror Arrays,” Precision Engineering, 51: pp. 729-761.

2017

[30] Shaw, L.A., Spadaccini, C.M., Hopkins, J.B., 2017, “Scanning Holographic Optical Tweezers,” Optics Letters, 42(15): pp. 2862-2865 (highlighted on the journal's website as the editor's pick).

[29] Sun, F., Hopkins, J.B., 2017, “Mobility and Constraint Analysis of Interconnected Hybrid Flexure Systems via Screw Algebra and Graph Theory,” Journal of Mechanisms and Robotics, 9(3): pp. 031018 (12 pages).

[28] Hopkins, J.B., Panas, R.M., Song, Y., White, C.D., 2017, “A High-speed Large-range Tip-tilt-piston Micromirror Array,” Journal of Microelectromechanical Systems, 26(1): pp. 196-205.

2016

[27] Hopkins, J.B., McCalib Jr., D., 2016, “Synthesizing Multi-axis Flexure Systems with Decoupled Actuators,” Precision Engineering, 46: pp. 206-220.

[26] Wang, Q., Jackson, J.A., Ge, Q., Hopkins, J.B., Spadaccini, C.M., Fang, N.X., 2016, “Lightweight Mechanical Metamaterials with Tunable Negative Thermal Expansion,” Physical Review Letters, 117(17): 175901 (6 pages) (featured as the first highlighted article in the issue by the editor's suggestion on the journal's website).

[25] Haghpanah, B., Salari-Sharif, L., Pourrajab, P., Hopkins, J.B., Valdevit, L., 2016, “Multistable Shape-Reconfigurable Architected Materials,” Advanced Materials, 28(36): pp. 7915-7920 (an image of the research is featured on the inside back cover of the Advanced Materials issue and the research was also highlighted in Nature, 535: pp. 327.

[24] Shaw, L.A., Chizari, S., Panas, R.M., Shusteff, M., Spadaccini, C.M., Hopkins, J.B., 2016, “Holographic Optical Assembly and Photopolymerized Joining of Planar Microspheres,” Optics Letters, 41(15): pp. 3571-3574.

[23] Song, Y., Dohm, P.C., Haghpanah, B., Vaziri, A., Hopkins, J.B., 2016, “An Active Microarchitectured Material that Utilizes Piezo Actuators to Achieve Programmable Properties,” Advanced Engineering Materials, 18(7): pp. 1113-1117 (featured on Materials Views).

[22] Hopkins, J.B., Shaw, L.A., Weisgraber, T.H., Farquar, G.R., Harvey, C.D., Spadaccini, C.M., 2016, “Design of Nonperiodic Microarchitectured Materials that Achieve Graded Thermal Expansions,” Journal of Mechanisms and Robotics, 8(5): 051010 (11 pages).

[21] Haghpanah, B., Ebrahimi, H., Mousanezhad, D., Hamouda, A.M.S., Hopkins, J.B., Vaziri, A., 2016, “Programmable Elastic Metamaterials,” Advanced Engineering Materials, 18(4): pp. 643-649.

[20] Hopkins, J.B., Song, Y., Lee, H., Fang, N.X., Spadaccini, C.M., 2016, “Polytope Sector-based Synthesis and Analysis of Microstructural Architectures with Tunable Thermal Conductivity and Expansion,” Journal of Mechanical Design, 138(5): 051401 (10 pages).

2015

[19] Shaw, L.A., Hopkins, J.B., 2015, “An Actively Controlled Shape-morphing Compliant Microarchitectured Material,” Journal of Mechanisms and Robotics, 8(2): 021019 (10 pages).

[18] Singh, G., Hopkins, J.B., 2015, “General Selection of Lattice Shape in Ductile-reinforced Brittle Structures for Increased Stiffness,” Composite Structures, 131: pp. 325-332.

[17] Hopkins, J.B., 2015 “A Visualization Approach for Analyzing and Synthesizing Serial Flexure Elements,” Journal of Mechanisms and Robotics , 7(3): 031011 (12 pages).

[16] Panas, R.M., Hopkins, J.B., 2015, “Eliminating Underconstraint in Double Parallelogram Flexure Mechanisms,” Journal of Mechanical Design, 137(9): 092301 (9 pages).

[15] Hopkins, J.B., Rivera, J., Kim, C., Krishnan, G., 2015, “Synthesis and Analysis of Soft Parallel Robots Comprised of Active Constraints,” Journal of Mechanisms and Robotics, 7(1): 011002 (13 pages). (submitted by invitation to a special edition).

2014

[14] Hopkins, J.B., Vericella, J.J., Harvey, C.D., 2014, “Modeling and Generating Parallel Flexure Elements,” Precision Engineering, 38(3): pp. 525-537.

2013 (The year our group started at UCLA)

[13] Hopkins, J.B., 2013, “Designing Hybrid Flexure Systems and Elements Using Freedom and Constraint Topologies,” Mechanical Sciences, 4: pp. 319-331.

[12] Hopkins, J.B., 2013, “Synthesizing Parallel Flexures That Mimic the Kinematics of Serial Flexures Using Freedom and Constraint Topologies,” Journal of Mechanisms and Robotics, 5(4): 041004 (9 pages).

[11] Hopkins, J.B., Lange, K.J., Spadaccini, C.M., 2013, “Designing Microstructural Architectures with Thermally Actuated Properties Using Freedom, Actuation, and Constraint Topologies,” Journal of Mechanical Design, 135(6): 061004 (10 pages).

[10] Panas, R.M., Hopkins, J.B., Lustrino, M., Panas, C.W., Watral, A., 2013, “An Instrument to Characterize the Dynamic Compliance of Skin,” Measurement, 46(3): pp. 1094-1100.

[9] Hopkins, J.B., Panas, R.M., 2013, “Design of Flexure-based Precision Transmission Mechanisms Using Screw Theory,” Precision Engineering, 37(2): pp. 299-307 (Posted to Advances in Engineering by invitation—http://advanceseng.com).

2012

[8] Hopkins, J.B., 2012, “Precision Flexure Bearing Design: On the Use of Freedom and Constraint Topologies,” Mikroniek Professional Journal on Precision Engineering, 52(5): pp. 34-39. (submitted by invitation)

[7] DiBiasio, C.M., Hopkins, J.B., 2012, “Sensitivity of Freedom Spaces During Flexure Stage Design via FACT,” Precision Engineering, 36(3): pp. 494-499.

2011

[6] Vasilyev, N.V., Kawata, M., DiBiasio, C.M., Durand, K.V., Hopkins, J.B., Traina, Z., Slocum, A.H., del Nido, P.J., 2011, “A Novel Cardioport for Beating-heart, Image-guided Intracardiac Surgery,” Journal of Thoracic and Cardiovascular Surgery, 142(6): pp. 1545-1551.

[5] DiBiasio, C.M., Durand, K.V., Hopkins, J.B., Traina, Z., Slocum, A.H., Vasilyev, N.V., del Nido, P.J., 2011, “Design of a Surgical Port for Minimally Invasive Beating-heart Intracardial Procedures,” Journal of Medical Devices, 5(4): pp. 045001-045005.

[4] Hopkins, J.B., Culpepper, M.L., 2011, “Synthesis of Precision Serial Flexure Systems Using Freedom and Constraint Topologies (FACT),” Precision Engineering, 35(4): pp. 638-649.

2010

[3] Hopkins, J.B., Culpepper, M.L., 2010, “A Screw Theory Basis for Quantitative and Graphical Design Tools that Define Layout of Actuators to Minimize Parasitic Errors in Parallel Flexure Systems,” Precision Engineering, 34(4): pp. 767-776.

[2] Hopkins, J.B., Culpepper, M.L., 2010, “Synthesis of Multi-degree of Freedom, Parallel Flexure System Concepts via Freedom and Constraint Topology (FACT)—Part II: Practice,” Precision Engineering, 34(2): pp. 271-278.

[1] Hopkins, J.B., Culpepper, M.L., 2010, “Synthesis of Multi-degree of Freedom, Parallel Flexure System Concepts via Freedom and Constraint Topology (FACT)—Part I: Principles,” Precision Engineering, 34(2): pp. 259-270.

Archived Preprint Publications

2023

[1] Panas, R.M., Sun, F., Farzaneh, A., Cortes, J., Bekker, L., Johnson, H., Mancini, J., Pascall, A., Hopkins, J.B., 2023, “Signal Propagation through Resettable Mechanical Logic,” Research Square, DOI: https://doi.org/10.21203/rs.3.rs-2440784/v1

Published Report Contributions

2018

[2] Hopkins, J.B., one of 46 contributors, 2018, “Metamaterials Manufacturing: Pathway to Industrial Competitiveness,” Mforesight Alliance for Manufacturing Foresight, Primary authors: Bishop-Moser, J., Spadaccini, C.M., and Andres, C.

2012

[1] Hopkins, J.B., 2012, “Massively Parallel Multi-Axis Microreflector Array for High-Speed Directed Light-Field Projection,” (pp. 23-24) in the FY2011 Engineering Innovations, Research, and Technology Report, Edited by McNichols, D., Minichino, C., Lawrence Livermore National Security, LLC., Livermore, CA.

Report Contributions

Archived Preprint

Conference Proceedings

Published Conference Papers (Peer-reviewed)

2024

[57] Yan, W., Ye, B., Li, L., Hopkins, J.B., Mehta, A., “Self-deployable, Adaptive Soft Robots Based on Contracting-cord Particle Jamming,” Proc. of the 40th International Symposium of Robotics Research (ISRR), Long Beach, CA, December 2024.

[56] Gray, A., Sainaghi, P., Luo, C., Cullinan, M.A., Hopkins, J.B., “Design and Fabrication of a Mezo-sized, Thermal Linear Transducer for Active Metamaterials,” Proc. of the 39th Annual Meeting of the American Society for Precision Engineering (ASPE), Houston, TX, November 2024.

[55] Luo, C., Hopkins, J.B., Cullinan, M.A., “Desired Stiffness Verification on Programmable MEMS Metamaterial,” The 37th International Conference on Micro Electro Mechanical Systems (IEEE MEMS 2024), Austin, TX, January 2024.

2023

[54] Sainaghi, P., Lee, R.H., Hopkins, J.B., “The Importance of Precision to Mechanical Neural Networks that Learn Behaviors,” Proc. of the 38th Annual Meeting of the American Society for Precision Engineering (ASPE), Boston, MA, November 2023.

2022

[53] Shimohara, S., Lee, R.H., Hopkins, J.B., “Two Degree-of-freedom Flexure Mechanisms with Variable Stiffness,” Proc. of the 37th Annual Meeting of the American Society for Precision Engineering (ASPE), Bellevue, WA, October 2022.

[52] Archer, N., Hopkins, J.B., “Numerical Identification of Freedom Spaces Using the Canonical Basis,” Proc. of the American Society of Mechanical Engineers (ASME) International Design Engineering Technical Conferences and Computers and Information in Engineering Conference (IDETC/CIE), St. Louis, MO, August 2022.

2021

[51] Sun, F., Panas, R.M., Bekker, L., Pascall, A.J., Farzaneh, A., Hopkins, J.B., “A Set of Turing Complete Mechanical Logic Elements and a Simple Logic Circuit,” Proc. of the 36th Annual Meeting of the American Society for Precision Engineering (ASPE), Minneapolis, MN, November 2021.

[50] Yang, Z., Hopkins, J.B., “High-speed Large-range Flexure-based Six-axis Positioner,” Proc. of the 36th Annual Meeting of the American Society for Precision Engineering (ASPE), Minneapolis, MN, November 2021.

2020

[49] Sun, F., Panas, R.M., Bekker, L., Mancini, J.A., Pascall, A.J., Farzaneh, A., Hopkins, J.B., “Design, Fabrication, and Signal Propagation Characteristics of Micro-mechanical Logic Elements,” Proc. of the 35th Annual Meeting of the American Society for Precision Engineering (ASPE), Virtual Conference, October 2020.

2019

[48] Sun, F., Panas, R.M., Hopkins, J.B., Pascall, A.J., “A Study of Micro-mechanical Logic Elements,” Proc. of the 34th Annual Meeting of the American Society for Precision Engineering (ASPE), Pittsburgh, PA, October 2019.

[47] Luo, C., Jayatilaka, G.C., Song, Y., Ladner, I.S., Cullinan, M.A., Hopkins, J.B., “Design, Fabrication, and Calibration of a Stiffness Programmable Metamaterial,” Proc. of the 34th Annual Meeting of the American Society for Precision Engineering (ASPE), Pittsburgh, PA, October 2019.

[46] Chizari, S., Shaw, L.A., Lim, M.P., Farzaneh, A., Austin, S., Hopkins, J.B., “Microfabrication via Holographic Optical Tweezers and Two-photon Polymerization,” Proc. of the 34th Annual Meeting of the American Society for Precision Engineering (ASPE), Pittsburgh, PA, October 2019.

[45] Panas, R.M., Simonelli, J.M., Karburn, J., Nguyen, V., Enstrom, K., Hopkins, J.B., “Experimental Characterization of Lightfield Directing Array Elements,” Proc. of the 34th Annual Meeting of the American Society for Precision Engineering (ASPE), Pittsburgh, PA, October 2019.

[44] Shaw, L.A., Chizari, S., Lim, M., Porter, M., Austin, S., Hopkins, J.B., “Using Optical Tweezers to Assemble Micro-spheres within Metamaterials that Achieve Engineered Wave Propagation Properties,” Proc. of the 13th International Congress on Artificial Materials for Novel Wave Phenomena – Metamaterials 2019, Rome, Italy, September 2019.

[43] Lee, R., Song, Y., Hopkins, J.B., “Computational Mechanical Metamaterials,” Proc. of the 22nd International Conference on Composite Materials (ICCM22), Melbourne, Australia, August 2019.

2018

[42] Jones, T.H., Ng., J, Xie, Y-H., Hopkins, J.B., “Design of a Graphene Nanoribbon Electrostatic Discharge Compliant Mechanism,” Proc. of the American Society of Mechanical Engineers (ASME) International Design Engineering Technical Conferences and Computers and Information in Engineering Conference (IDETC/CIE), Quebec City, Quebec, Canada, August 2018.

2017

[41] Shaw, L.A., Chizari, S., Porter, M., Hopkins, J.B., “Automated Assembly with Optical Tweezers,” Proc. of the 32nd Annual Meeting of the American Society for Precision Engineering (ASPE), Charlotte, NC, October 2017.

[40] Zhao, C., Ladner, I.S., Song, Y., Hopkins, J.B., Cullinan, M.A., “Design and Modeling of a Bidirectional MEMS Thermal Actuator,” Proc. of the 32nd Annual Meeting of the American Society for Precision Engineering (ASPE), Charlotte, NC, October 2017.

[39] Hatamizadeh, A., Song, Y., Hopkins, J.B., “Geometry Optimization of Flexure System Topologies Using the Boundary Learning Optimization Tool (BLOT),” Proc. of the American Society of Mechanical Engineers (ASME) International Design Engineering Technical Conferences and Computers and Information in Engineering Conference (IDETC/CIE), Cleveland, OH, August 2017.

[38] Spadaccini, C.M., Jackson, J.A., Watts, S.E., Tortorelli, D., Duoss, E., Kuntz, J., Hopkins, J.B., Fang, N., “Integrated Computational Materials Engineering (ICME) Approaches to the Design and Fabrication of Architected Materials,” Proc. of the American Institute of Aeronautics and Astronautics (AIAA) Science and Technology Forum and Exposition 2017, Gaylord Texan, Grapevine, Texas, January 2017.

2016

[37] Panas, R.M, Cullinan, M.A., Saha, S.K., Hopkins, J.B., “Micro-Nano TLC Overview of Research in Precision Micro- and Nano-technology,” Proc. of the 31st Annual Meeting of the American Society for Precision Engineering (ASPE), Portland, OR, October 2016.

[36] Shaw, L.A., Chizari, S., Parker, D., Panas, R.M., Shusteff, M., Spadaccini, C.M., Hopkins, J.B., “Additive Fabrication and Micro-Assembly with Scanning Holography,” Proc. of the 31st Annual Meeting of the American Society for Precision Engineering (ASPE), Portland, OR, October 2016.

[35] Song, Y., Panas, R.M., Hopkins, J.B., “Micro-mirror Array: Classification, Review, and Performance Comparison,” Proc. of the 31st Annual Meeting of the American Society for Precision Engineering (ASPE), Portland, OR, October 2016.

[34] Sun, F., Hopkins, J.B., “Mobility Analysis of Interconnected Hybrid Flexure Systems Using Screw Algebra and Graph Theory,” Proc. of the American Society of Mechanical Engineers (ASME) International Design Engineering Technical Conferences and Computers and Information in Engineering Conference (IDETC/CIE), Charlotte, NC, August 2016.

[33] Shusteff, M., Dudoff, J.K., Browar, A.E.M., Shaw, L.A., Panas, R.M., Hopkins, J.B., Fang, N.X., Spadaccini, C.M., “Optimal Source Beam Shaping for Digital Holographic Lithography,” Proc. of The Optical Society (OSA) Digital Holography and 3-D Imaging (DH) conference, Heidelberg, Germany, July 2016.

[32] Shaw, L.A., Chizari, S., Panas, R.M., Shusteff, M., Spadaccini, C.M., Hopkins, J.B., “Planar Microparticle Assembly and Photopolymerized Joining with Holographic Optical Tweezers,” Proc. of the CLEO: 2016 Laser Science to Photonic Applications Technical Conference, San Jose, CA, June 2016.

[31] Haghpanah, B., Pourrajab, P., Salari-Sharif, L., Hopkins, J.B., Valdevit, L., “Two-dimensional Shape Re-configurable Architectured Materials,” Proc. of the 11th International Conference on Micro Manufacturing (ICOMM), Orange County, CA, March 2016.

2015

[30] Hopkins, J.B., “Flexure Design of Active Microarchitectured Materials that Achieve Programmable Properties via Control,” Proc. of the 30th Annual Meeting of the American Society for Precision Engineering, Austin, TX, November 2015.

[29] Hopkins, J.B., Panas, R.M., Song, Y., “Categorization and Review of Existing Micro-mirror Array Technologies,” Proc. of the 30th Annual Meeting of the American Society for Precision Engineering, Austin, TX, November 2015.

[28] Hopkins, J.B., Panas, R.M., Jackson, J.A., Smith, W.L., Harvey, C.D., Uphaus, T.M., “Hybrid Additive and Microfabrication of an Advanced Micromirror Array,” Proc. of the 30th Annual Meeting of the American Society for Precision Engineering, Austin, TX, November 2015.

[27] Shaw, L.A., Hopkins, J.B., “A Shape-controlled Compliant Microarchitectured Material,” Proc. of the ASME 2015 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference IDETC/CIE, Boston, MA, August 2015.

[26] Hopkins, J.B., Lee, H., Fang, N.X., Spadaccini, C.M., “Polytope Sector-based Synthesis and Analysis of Microarchitectured Materials with Tunable Thermal Conductivity and Expansion,” Proc. of the ASME 2015 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference IDETC/CIE, Boston, MA, August 2015.

[25] Hopkins, J.B., Shaw, L.A., Weisgraber, T.H., Farquar, G.R., Harvey, C.D., Spadaccini, C.M., “Organizing Cells Within Non-Periodic Microarchitectured Materials That Achieve Graded Thermal Expansions,” Proc. of the ASME 2015 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference IDETC/CIE, Boston, MA, August 2015.

2014

[24] Hopkins, J.B., Panas, R.M., “Flexure Design for a High-speed Large-range Tip-tilt-piston Micro-mirror Array,” Proc. of the 29th Annual Meeting of the American Society for Precision Engineering, Boston, MA, November 2014.

[23] Hopkins, J.B., Panas, R.M., “Actuator Design for a High-speed Large-range Tip-tilt-piston Micro-mirror Array,” Proc. of the 29th Annual Meeting of the American Society for Precision Engineering, Boston, MA, November 2014.

[22] Hopkins, J.B., Song, Y., Wang, S., Behbahani, A.H., Josefson, I., “Optimal Actuation of Dynamically Driven Serial and Hybrid Flexure Systems,” Proc. of the ASME 2014 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference IDETC/CIE, Buffalo, NY, August 2014.

[21] Hopkins, J.B., Rivera, J., Kim, C., “Synthesizing Soft Parallel Robots Comprised of Active Constraints,” Proc. of the ASME 2014 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference IDETC/CIE, Buffalo, NY, August 2014.

2013 (The year our group started at UCLA)

[20] Hopkins, J.B., Panas, R.M., “Eliminating Parasitic Error in Dynamically Driven Flexure Systems,” Proc. of the 28th Annual Meeting of the American Society for Precision Engineering, St. Paul, MN, October 2013.

[19] Hopkins, J.B., “Analyzing and Designing Serial Flexure Elements,” Proc. of the ASME 2013 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference IDETC/CIE, Portland, OR, August 2013.

[18] Hopkins, J.B., Panas, R.M., “A Family of Flexures That Eliminate Underconstraint in Nested Large-Stroke Flexure Systems,” Proc. of the 13th International Conference of the European Society for Precision Engineering & Nanotechnology, Berlin, Germany, May 2013.

2012

[17] Hopkins, J.B., McCalib, D.B., “Synthesizing Precision Flexures That Decouple Displacement-based Actuators,” Proc. of the 27th Annual Meeting of the American Society for Precision Engineering, San Diego, CA, October 2012.

[16] Hopkins, J.B., Lange, K.J., Spadaccini, C.M., “Synthesizing the Compliant Microstructure of Thermally Actuated Materials Using Freedom, Actuation, and Constraint Topologies,” Proc. of the ASME 2012 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference IDETC/CIE, Chicago, IL, August 2012.

[15] Hopkins, J.B., “Modeling and Generating New Flexure Constraint Elements,” Proc. of the 12th International Conference of the European Society for Precision Engineering & Nanotechnology, Stockholm, Sweden, June 2012.

2011

[14] Hopkins, J.B., “Synthesizing Parallel Flexure Concepts that Mimic the Complex Kinematics of Serial Flexures Using Displaced Screw Systems,” Proc. of the ASME 2011 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference IDETC/CIE, Washington, DC, August 2011.

[13] Yu, J.J., Kong, X.W., Hopkins, J.B., Culpepper, M.L., Dai., J.S., “The Reciprocity of a Pair of Line Spaces,” Proc. of the 13th World Congress in Mechanism and Machine Science, Guanajuato, Mexico, June 2011.

[12] Hopkins, J.B., Panas, R.M., “Design of Flexure-based Precision Transmission Mechanisms Using Screw Theory,” Proc. of the 11th International Conference of the European Society for Precision Engineering & Nanotechnology, Como, Italy, May 2011.

2010

[11] Yu, J.J., Li, S.Z., Pei, X., Su, H., Hopkins, J.B., Culpepper, M.L., “Type Synthesis Principle and Practice of Flexure Systems in the Framework of Screw Theory Part I: General Methodology,” Proc. of the ASME 2010 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference IDETC/CIE, Montreal, Quebec, Canada, August 2010.

[10] Yu, J.J., Li, S.Z., Pei, X., Su, H., Hopkins, J.B., Culpepper, M.L., “Type Synthesis Principle and Practice of Flexure Systems in the Framework of Screw Theory Part II: Numerations and Synthesis of Large-displacement Flexible Joints,” Proc. of the ASME 2010 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference IDETC/CIE, Montreal, Quebec, Canada, August 2010.

[9] Yu, J.J., Li, S.Z., Pei, X., Su, H., Hopkins, J.B., Culpepper, M.L., “Type Synthesis Principle and Practice of Flexure Systems in the Framework of Screw Theory Part III: Numerations and Type Synthesis of Flexure Mechanisms,” Proc. of the ASME 2010 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference IDETC/CIE, Montreal, Quebec, Canada, August 2010.

2009

[8] Hopkins, J.B., Culpepper, M.L., “Synthesis of Multi-axis Serial Flexure Systems,” Proc. of the 24th Annual Meeting of the American Society for Precision Engineering, Monterey, CA, October 2009.

[7] Olsen, B.M., Hopkins, J.B., Howell, L.L., Magleby, S.P., Culpepper, M.L., “A Proposed Extendable Classification Scheme for Compliant Mechanisms,” Proc. of the ASME 2009 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference IDETC/CIE, San Diego, CA, August 2009.

[6] Hopkins, J.B., Culpepper, M.L., “Determining the Optimal Actuator Placement for Parallel Flexure Systems,” Proc. of the 9th International Conference of the European Society for Precision Engineering & Nanotechnology, San Sebastian, Spain, June 2009.

[5] Thompson, M.K., Thomas, B.C., Hopkins, J.B., “Applying Axiomatic Design to the Educational Process,” Proc. of the 5th International Conference on Axiomatic Design (ICAD), Lisbon, Portugal, March 2009.

2007

[4] Hopkins, J.B., Culpepper, M.L., “A Design Process for the Creation of Precision Flexure Concepts via the Use of Freedom and Constraint Topology,” Proc. of the 22nd Annual Meeting of the American Society for Precision Engineering, Dallas, TX, October 2007.

[3] Hopkins, J.B., Culpepper, M.L., “Synthesis of Multi-degree-of-freedom Precision Flexure Concepts via Freedom and Constraint Topologies,” Proc. of the 22nd Annual Meeting of the American Society for Precision Engineering, Dallas, TX, October 2007.

2006

[2] Hopkins, J.B., Culpepper, M.L., “A Quantitative, Constraint-based Design Method for Multi-axis Flexure Stages for Precision Positioning and Equipment,” Proc. of the 21st Annual Meeting of the American Society for Precision Engineering, Monterey, CA, October 2006.

[1] DiBiasio, C.M., Durand, K.V., Traina, Z., Hopkins, J.B., Slocum, A.H., del Nido, P., Vasilyev, N., “Cardio Door: A Specialized Port to Prevent Air from Entering the Heart during Minimally Invasive Cardiac Surgery,” Proc. of the 2006 NewEra Cardiac Care Conference, 53, Newport Beach, CA, January 2006.

Conference Abstracts

Theses

Conference Abstracts (not listed previously)

2024

[69] Hopkins, J.B., “Designing Compliant Mechanisms using Freedom and Constraint Topologies,” 3DEXPERIENCE World 2024, Houston, TX, February 2025

[68] Ahmadi, M., Moestopo, W.P., Parakh, A., Bekker, L., Farzaneh, A., Lee, E., Cook, C.C., Johnson, H.A., Panas, R.M., Cortes, J.G., Pascall, A.J., Hopkins, J.B., “Multi-stimuli, Multi-scale, Transduction via Mechanical Logic,” 39th Annual Meeting of the American Society for Precision Engineering (ASPE), Houston, TX, November 2024 (permission was granted to wave the submission of the extended abstract for publication)

[67] Riley, K., Johnson, H.A., Bekker, L., Panas, R.M., Cortes, J.G., Pascall, A.J., Hopkins, J.B., “Compliant Building Blocks of Mechanical Computing,” American Society of Mechanical Engineers (ASME) 2024 Smart Materials, Adaptive Structures and Intelligent Systems (SMASIS2024), Atlanta, GA, September 2024.

[66] Vazzoler, G., Shimohara, S., Berselli, G., Hopkins, J.B., “Design Methodology and Physical Prototyping of a Binary Stiffness, Rotary Motion, Compliant Mechanism with Multiple, Decoupled, Degrees-of-freedom,” American Society of Mechanical Engineers (ASME) International Design Engineering Technical Conferences and Computers and Information in Engineering Conference (IDETC/CIE), Washington, DC, August 2024 (A full conference paper was written and accepted for publication in the conference proceedings but then the paper was flagged for publication in the Journal of Mechanisms and Robotics for the special issue on Selected Papers from IDETC 2024. Thus, the paper was not published in the conference proceedings and is counted here as an abstract submission).

[65] Yang, Z., Weida, J.L., Shao, S., Sheth, P., Hopkins, J.B., “Using Compliant Mechanisms to Prevent Bedsores,” American Society of Mechanical Engineers (ASME) International Design Engineering Technical Conferences and Computers and Information in Engineering Conference (IDETC/CIE), Washington, DC, August 2024.

[64] Sainaghi, P., Gray, A., Luo, C., Cullinan, M.A., Hopkins, J.B., “Design and Fabrication of Flexure-Based, Meso-Sized, Thermally-Actuated, Bidirectional Linear Transducer,” American Society of Mechanical Engineers (ASME) International Design Engineering Technical Conferences and Computers and Information in Engineering Conference (IDETC/CIE), Washington, DC, August 2024.

[63] Hopkins, J.B., “Mechanical Neural Networks that Learn to Design other Passive Metamaterials,” International Conferences on Modern Materials & Technologies (CIMTEC), Montecatini Terme, Italy, June 2024 (Although the abstract was accepted for an oral presentation, I was not able to attend the conference and had to cancel my talk).

[62] Hopkins, J.B., “Designing Compliant Mechanisms using Freedom and Constraint Topologies,” 3DEXPERIENCE World 2024, Dallas, TX, February 2024.

[61] Peterson, B.T., Upfill-Brown, A., Hopkins, J.B., Soohoo, N.F., Clites, T.R., “Novel ‘Compliant’ Implanted Ankle-foot Prosthesis in a Caprine Model,” Orthopaedic Research Society (ORS) 2024 Annual Meeting, Long Beach, CA, February 2024.

[60] Ruffini, L., Peterson, B.T., Soohoo, N.F., Wessel, L.E., Hopkins, J.B., Clites, T.R., “Compliant Wrist Endoprosthesis for Extensive Pan-carpal and DRUJ Damage,” Orthopaedic Research Society (ORS) 2024 Annual Meeting, Long Beach, CA, February 2024.

[59] Pomeroy, A.W., Upfill-Brown, A., Peterson, B.T., Hopkins, J.B., Soohoo, N.F., Clites, T.R., “Optimization of a Compliant Tibial Stem for Total Knee Arthroplasty,” Orthopaedic Research Society (ORS) 2024 Annual Meeting, Long Beach, CA, February 2024.

[58] Peterson, B.T., Upfill-Brown, A., Hopkins, J.B., Soohoo, N.F., Clites, T.R., “Compliant Joint Reconstruction,” Orthopaedic Research Society (ORS) 2024 Annual Meeting, Long Beach, CA, February 2024.

2023

[57] Johnson, H.A., Panas, R.M., Farzaneh, A., Bekker, L., Ahmadi, M., Cortes, J., Pascall, A.J., Hopkins, J.B., “Micro-mechanical AND Gate Kinematics, Energetics and Dynamics,” 38th Annual Meeting of the American Society for Precision Engineering (ASPE), Boston, MA, November 2023 (permission was granted to wave the submission of the extended abstract for publication).

[56] Archer, N.C., Hopkins, J.B., “Screw-enabled Large-range Compliant Transmission Mechanism,” American Society of Mechanical Engineers (ASME) International Design Engineering Technical Conferences and Computers and Information in Engineering Conference (IDETC/CIE), Boston, MA, August 2023.

[55] Hopkins, J.B., “Artificial Intelligent Architected Materials that Learn their Properties,” Materials Research Society (MRS) Spring Meeting and Exhibit, San Francisco, CA, April 2023 (invited talk).

[54] Peterson, B.T., Upfill-Brown, A., Hopkins, J.B., SooHoo, N.F., Clites, T.R., “Design and Validation of an Implanted Ankle-foot Prosthesis for Severe Ankle and Hindfoot Pathology,” American Academy of Orthopaedic Surgeons (AAOS) 2023, Las Vegas, NV, March 2023.

[53] Mooney, B., Upfill-Brown, A., Peterson, B.T., Carter, M., Sriram, V., Duarte-Vogel, S., Hopkins, J.B., SooHoo, N.F., Clites, T.R., “Caprine Animal Model of a Novel ‘Compliant’ Implanted Ankle-foot Prosthesis," American Academy of Orthopaedic Surgeons (AAOS) 2023, Las Vegas, NV, March 2023.

[52] McCullough, J., Upfill-Brown, A., Peterson, B.T., Wong, Z., SooHoo, N.F., Hopkins, J.B., Clites, T.R., “Design and Validation of a Compliant Tibial Stem for Total Knee Arthroplasty,” American Academy of Orthopaedic Surgeons (AAOS) 2023, Las Vegas, NV, March 2023.

[51] Peterson, B.T., Upfill-Brown, A., Tomkinson, A., SooHoo, N.F., Hopkins, J.B., Clites, T.R., “A Design-optimization Framework for Compliant Implanted Prostheses that Restore Joint Function,” NSF-DARE Conference: Transformative Opportunities for Modeling in Neurorehabilitation, Los Angeles, CA, March, 2023.

[50] Archer, N., Hopkins, J.B., “Designing Compliant Mechanisms using Freedom and Constraint Topologies,” 3DEXPERIENCE World 2023, Nashville, TN, February 2023.

2022

[49] Johnson, H.A., Cortes, J., Bekker, L., Farzaneh, A., Hopkins, J.B., Slocum, A.H., Panas, R.M., “Design and Manufacturing of Microscale Mechanical Logic Circuits,” 37th Annual Meeting of the American Society for Precision Engineering (ASPE), Bellevue, WA, October 2022 (permission was granted to wave the submission of the extended abstract for publication).

[48] Archer, N., Hopkins, J.B., “Designing Compliant Mechanisms using Freedom and Constraint Topologies,” 3DEXPERIENCE World 2022, Atlanta, GA, February 2022.

[47] Lee, R., Hopkins, J.B., “Active Metamaterials that Learn to Design Passive Metamaterials,” The 2022 Gordon Research Conference on Multifunctional Materials and Structures: Imparting Intelligence in and Through Self-learning Materials and Structures, Ventura, CA, January 2022.

2021

[46] Hopkins, J.B., “Mechanical Neural-network Architecture Materials that Learn,” 36th Annual Technical Conference of American Society for Composites (ASC), Tri-Agency Symposium on “Multifunctionality, System Endurance, & Intelligent Structures,” Virtual Conference, September 2021.

[45] Kuppens, P.R., Bessa, M.A., Herder, J.L., Hopkins, J.B., “Statically Balanced Architected Materials That Achieve Switchable States of Stiffness,” American Society of Mechanical Engineers (ASME) International Design Engineering Technical Conferences and Computers and Information in Engineering Conference (IDETC/CIE), Virtual Conference, August 2021.

[44] Hopkins, J.B., “Manufacturing Micro-granular Crystals and Other Advanced Microstructures Using Optical Tweezers,” American Society of Mechanical Engineers (ASME) Manufacturing Science and Engineering Conference (MSEC), Virtual Conference, June 2021 (invited speaker).

[43] Hopkins, J.B., “Design of Architected Materials Using Freedom And Constraint Topologies (FACT),” Materials Research Society (MRS) Spring Meeting and Exhibit, Virtual Conference, April 2021 (invited talk).

2020

[42] Kuppens, P.R., Bessa, M.A., Herder, J.L., Hopkins, J.B., “Fully Compliant Statically Balanced Mechanisms by Opposing Constant Force and Torque,” American Society of Mechanical Engineers (ASME) International Design Engineering Technical Conferences and Computers and Information in Engineering Conference (IDETC/CIE), St. Louis, MO, August 2020 (This abstract was withdrawn because it was submitted to a symposium that was canceled due to COVID-19).

[41] Chizari, S., Lim, M., Shaw, L., Hopkins, J.B., “3D Optical Fabrication at the Intersection of Two-Photon Lithography and Optical Trapping,” The International Society for Optics and Photonics (SPIE) Nanoscience and Engineering 2020, Virtual Conference, August 2020.

[40] Chizari, S., Lim, M., Austin, S., Shaw, L., Farzaneh, A., Hopkins, J.B., “Using Optical Tweezers and Two-photon Polymerization to Assemble Microspheres,” The International Society for Optics and Photonics (SPIE) Photonics West 2020, San Francisco, CA, February 2020.

[39] Lee, R., Hopkins, J.B., “Metamaterials that Learn their Properties,” The 2020 Gordon Research Conference on Multifunctional Materials and Structures: Progression from Integrated Multifunctionality to Neuromorphic Networks for Autonomy, Ventura, CA, January 2020.

[38] Panas, R.M., Uphaus, T., Cortes, J., Corral, P., Enstrom, K., Pascall, A., Sun, F., Bekker, L., Mancini, J., Farzaneh, A., Hopkins, J.B., Hall, H., Starman, L., “Precision Micro/Nano Team at LLNL,” American Society for Precision Engineering (ASPE) Winter 2020 – Precision Micro-Nano Meeting, Austin, TX, January 2020.

[37] Sun, F., Panas, R.M., Bekker, L., Mancini, J., Uphaus, T., Pascall, A., Farzaneh, A., Hopkins, J.B., “A Study of Mechanical Logic Elements,” American Society for Precision Engineering (ASPE) Winter 2020 – Precision Micro-Nano Meeting, Austin, TX, January 2020.

[36] Farzaneh, A., Sun, F., Pascall, A., Panas, R.M., Hopkins, J.B., “Design and Microfabrication of Mechanical Logic Gates,” American Society for Precision Engineering (ASPE) Winter 2020 – Precision Micro-Nano Meeting, Austin, TX, January 2020.

[35] Lim, M., Chizari, S., Shaw, L., Austin, S., Hopkins, J.B., “Automated Three-dimensional Microgranular Crystal Fabrication,” American Society for Precision Engineering (ASPE) Winter 2020 – Precision Micro-Nano Meeting, Austin, TX, January 2020.

2019

[34] Chizari, S., Lim, M., Porter, M., Austin, S., Hopkins, J.B., “Mechanics of Optical-tweezer Fabricated Micro-granular Crystals,” Materials Research Society (MRS) Fall Meeting and Exhibit, Boston, MA, December 2019 (invited talk).

[33] Hopkins, J.B., “Active and Shape Changing Metamaterials,” 56th Annual Technical Meeting of the Society of Engineering Science (SES), St. Louis, MO, October 2019 (invited keynote speaker).

[32] Panas, R.M., Karburn, J.J., Enstrom, K.G., Nguyen, V.H., Simonelli, J., Hopkins, J.B., “A Micro-architected Mechanism-based Optical Surface,” American Society of Mechanical Engineers (ASME) International Design Engineering Technical Conferences and Computers and Information in Engineering Conference (IDETC/CIE), Anaheim, CA, August 2019.

[31] Pascall, A., Song, Y., Panas, R.M., Chizari, S., Shaw, L.A., Jackson, J., Bekker, L., Sun, F., Hopkins, J.B., “Material Logic: Mechanical Metamaterials that Compute,” American Society of Mechanical Engineers (ASME) International Design Engineering Technical Conferences and Computers and Information in Engineering Conference (IDETC/CIE), Anaheim, CA, August 2019.

[30] Luo, C., Song, Y., Zhao, C., Ladner, I., Cullinan, M.A., Hopkins, J.B., “Mechatronic Metamaterials that Achieve Programmable Properties,” American Society of Mechanical Engineers (ASME) International Design Engineering Technical Conferences and Computers and Information in Engineering Conference (IDETC/CIE), Anaheim, CA, August 2019.

[29] Lee, R., Hopkins, J.B., “Metamaterials that Learn their Properties,” American Society of Mechanical Engineers (ASME) International Design Engineering Technical Conferences and Computers and Information in Engineering Conference (IDETC/CIE), Anaheim, CA, August 2019.

[28] Chizari, S., Lim, M., Austin, S., Shaw, L.A., Hopkins, J.B., “Automated Three-dimensional Microgranular Crystal Fabrication,” American Society of Mechanical Engineers (ASME) International Design Engineering Technical Conferences and Computers and Information in Engineering Conference (IDETC/CIE), Anaheim, CA, August 2019.

[27] Farzaneh, A., Pawar, N., Portela, C.G., Greer, J., Hopkins, J.B., “Metamaterial with Fluctuating Poisson’s Ratios,” American Society of Mechanical Engineers (ASME) International Design Engineering Technical Conferences and Computers and Information in Engineering Conference (IDETC/CIE), Anaheim, CA, August 2019.

[26] Chizari, S., Shaw, L.A., Dotson, M., Song, Y., Hopkins, J.B., “Compliant Rolling-contact Architected Materials,” American Society of Mechanical Engineers (ASME) International Design Engineering Technical Conferences and Computers and Information in Engineering Conference (IDETC/CIE), Anaheim, CA, August 2019.

[25] Chizari, S., Porter, M., Lim, M., Austin, S., Hopkins, J.B., “Fabrication and Mechanics of Engineered Micro-granular Crystals,” The National Academy of Science/The U.S. National Committee on Theoretical and Applied Mechanics (USNCTAM)/AmeriMech Conference: The Intersection of Advanced Additive Manufacturing, Mechanics, and Materials, Berkeley, CA, June 2019 (by invitation only).

2018

[24] Song, Y., Panas, R.M., Chizari, S., Shaw, L.A., Jackson, J.A., Hopkins, J.B., Pascall, A.J., “Additively Manufacturable Micro-mechanical Logic Gates,” Materials Research Society (MRS) Fall Meeting and Exhibit, Boston, MA, November 2018

[23] Sun, F., Hopkins, J.B., “Design of Aperiodic Metamaterials with Anisotropic Stiffness,” Architectured Materials: Advances in Modeling, Design, Fabrication, Characterization, and Applications mini-symposium within the American Society of Civil Engineers (ASCE) Engineering Mechanics Institute Conference (EMI) 2018, Cambridge, MA, May 2018.

[22] Shaw, L.A., Chizari, S., Hopkins, J.B., “Enabling the Dynamic Properties of Engineered Micro-granular Crystals via Optical Tweezers Fabrication,” Meta-structures: Dynamics, Topology and Related Opportunities, An ARO-Funded Workshop, Atlanta, GA, May 2018.

[21] Shaw, L.A., Dotson, M.B., Chizari, S., Song, Y., Hopkins, J.B., “Compliant Rolling-contact Architectured Materials for Shape Reconfiguration,” American Physical Society (APS) March Meeting 2018, Los Angeles, CA, March 2018.

[20] Simonelli, J.M., Panas, R.M., Hopkins, J.B., “Modeling and Control of an Advanced Micromirror Array,” 2018 Winter Topical Meeting of the American Society for Precision Engineering (ASPE) on Precision Engineering for Micro and Nanotechnology, Livermore, CA, February 2018.

[19] Song, Y., Pascall, A., Panas, R.M., Hopkins, J.B., Mancini, J., “Feasibility Study on Micro-mechanical Logic Gates and Systems,” 2018 Winter Topical Meeting of the American Society for Precision Engineering (ASPE) on Precision Engineering for Micro and Nanotechnology, Livermore, CA, February 2018.

[18] Shaw, L.A., Chizari, S., Austin, S., Barranco, R., Hopkins, J.B., “Automated 3D Assembly with Holographic Optical Tweezers,” 2018 Winter Topical Meeting of the American Society for Precision Engineering (ASPE) on Precision Engineering for Micro and Nanotechnology, Livermore, CA, February 2018.

[17] Shaw, L.A., Dotson, M.B., Chizari, S., Song, Y., Hopkins, J.B., “Shape Morphing Compliant Rolling-contact Metamaterials,” The 2018 Gordon Research Conference on Multifunctional Materials and Structures: Bridging the Gap between Biological and Synthetic Systems, Ventura, CA, January 2018.

2017

[16] Song, Y., Zhao, C., Ladner, I., Cullinan, M., Hopkins, J.B., “Thermally Actuated Metamaterial that Achieves Programmable Properties,” American Society of Mechanical Engineers (ASME) International Mechanical Engineering Congress and Exposition (IMECE), Tampa, FL, November 2017.

[15] Shaw, L.A., Samira, C., Dotson, M.B., Song, Y., Hopkins, J.B., “Design and Fabrication of Compliant Rolling-contact Metamaterials,” American Society of Mechanical Engineers (ASME) International Mechanical Engineering Congress and Exposition (IMECE), Tampa, FL, November 2017.

[14] Austin, S.P., Shaw, L.A., Hopkins, J.B., “Micro-fabrication via Optical Trapping and Photopolymerization,” Annual Biomedical Research Conference for Minority Students (ABRCMS), Phoenix, AZ, November 2017.

[13] Dotson, M.B., Samira, C., Hopkins, J.B., “Design of 3D Printed Compliant Rolling-contact Metamaterials,” 54th Annual Technical Meeting of the Society of Engineering Science (SES), Boston, MA, July 2017.

[12] Sun, F., Hopkins, J.B., “Design of 3D Printed Non-periodic Metamaterials with Anisotropic Stiffness,” 54th Annual Technical Meeting of the Society of Engineering Science (SES), Boston, MA, July 2017.

2016

[11] Haghpanah, B., Valdevit, L., Salari-Sharif, L., Hopkins, J.B., “Static and Dynamic Response of Multi-stable Metamaterials,” 53rd Annual Technical Meeting of the Society of Engineering Science (SES), College Park, MD, October 2016.

[10] Haghpanah, B., Pourrajab, P., Salari-Sharif, L., Hopkins, J.B., Valdevit, L., “Architected Shape Reconfigurable Materials,” The Hopkins Extreme Materials Institute 2016 Mach Conference, Annapolis, MD, April 2016.

[9] Song, Y., Hopkins, J.B., “Design of Actively Controlled Microarchitectures with Programmable Mechanical Properties,” The 2016 Gordon Research Conference on Multifunctional Materials and Structures: Science of Autonomic, Adaptive and Self-Sustaining Systems, Ventura, CA, February 2016.

2015

[8] Hopkins, J.B., Shaw, L.A., “Analytically Characterizing the Dynamic Response of Multi-phased Microarchitectured Materials Subjected to Thermal Loads,” Materials Research Society (MRS) Fall Meeting and Exhibit, Boston, MA, December 2015.

[7] Haghpanah, B., Pourrajab, P., Salari-Sharif, L., Hopkins, J.B., Valdevit, L., “Shape Reconfigurable Soft Structures,” Materials Research Society (MRS) Fall Meeting and Exhibit, Boston, MA, December 2015.

[6] Wang, Q., Jackson, J.A., Ge, Q., Hopkins, J.B., Spadaccini, C.M., Fang, N.X., “3D Printed Structures with Negative Thermal Expansion,” Materials Research Society (MRS) Fall Meeting and Exhibit, Boston, MA, December 2015.

[5] Wang, Q., Jackson, J.A., Ge, Q., Hopkins, J.B., Spadaccini, C.M., Fang, N.X., “3D Printed Structures with Negative Thermal Expansion,” American Society of Mechanical Engineers (ASME) International Mechanical Engineering Congress and Exposition (IMECE), Houston, TX, November 2015.

[4] Haghpanah, B., Hopkins, J.B., Valdevit, L., “Shape Reconfigurable Soft Structures,” 52nd Annual Technical Meeting of the Society of Engineering Science (SES), College Station, TX, October 2015.

[3] Hopkins, J.B., Song, Y., “Actively Controlled Microarchitectured Materials with Programmable Properties,” The Hopkins Extreme Materials Institute 2015 Mach Conference, Annapolis, MD, April 2015.

2013 (The year our group started at UCLA)

[2] Hopkins, J.B., Weisgraber, T.H., Lange, K.J., Spadaccini, C.M., Harvey, C.D., Farquar, G.R., “Analytical Tools for Optimizing the Effective Properties of Microstructural Architectures,” Materials Research Society (MRS) Fall Meeting and Exhibit, Boston, MA, December 2013.

2012

[1] Hopkins, J.B., “Engineering the Microstructural Architecture of New Materials Using Freedom, Actuation, and Constraint Topologies (FACT),” 22nd Annual International Workshop on Computational Mechanics of Materials IWCMM XXII, Baltimore, MD, September 2012.

Theses Published from Group

2024

[12] Zhidi Yang, 2024, “Design and Optimization of Compliant Systems: Six-axis Positioner and Bedsore-prevention Mattress Case Studies,” Ph.D. Thesis, University of California, Los Angeles.

[11] Nigel C. Archer, 2024, “Principal Geometries and Interconnected Hybrid Synthesis Using the FACT Design Approach,” Ph.D. Thesis, University of California, Los Angeles.

2023

[10] Wenzhong Yan, 2023, “Printable Mechanical Autonomy,” Ph.D. Thesis, University of California, Los Angeles.

[9] Ryan H. Lee, 2023, “Mechanical Neural-Networks: Materials That Learn Their Properties and Behaviors,” Ph.D. Thesis, University of California, Los Angeles.

2020

[8] Samira Chizari, 2020, "Advancing Two-photon Lithography by Integrating Microfluidics and Optical Tweezers,” Ph.D. Thesis, University of California, Los Angeles.

2018

[7] Talmage Jones, 2018, “Mechanical Design of Graphene Nanoribbon Compliant Mechanisms for Electrostatic Discharge,” Master’s Thesis, University of California, Los Angeles.

[6] Yuanping (Adam) Song, 2018, “Design and Optimization of Active Microarchitectured Metamaterials,” Ph.D. Thesis, University of California, Los Angeles.

[5] Lucas A. Shaw, 2018, “Additive Microfabrication with Holographic Optical Tweezers,” Ph.D. Thesis, University of California, Los Angeles.

[4] Frederick Sun, 2018, “Analysis and Synthesis of Flexure Systems via Screw Algebra and Graph Theory,” Ph.D. Thesis, University of California, Los Angeles.

2010

[3] Hopkins, J.B., 2010, "Design of Flexure-based Motion Stages for Mechatronic Systems Via Freedom, Actuation and Constraint Topologies (FACT)," Ph.D. Thesis, Massachusetts Institute of Technology.

2007

[2] Hopkins, J.B., 2007, "Design of Parallel Flexure Systems Via Freedom and Constraint Topologies (FACT)," Master's Thesis, Massachusetts Institute of Technology.

2005

[1] Hopkins, J.B., 2005, "The Effect of Probe Tilt Angle on the Quality of Scanning Tunneling Microscope Measurements," Bachelor's Thesis, Massachusetts Institute of Technology.

Wikipedia Articles Published About Our Group's Work

2024

[2] “Jonathan B. Hopkins,” Wikipedia, April 2024.

[1] “Freedom and constraint topologies,” Wikipedia, April 2024.

Wikipedia