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Refereed Journal and Conference Publications

  1. J. Cho, J. Yan, J. A. Gregory, H. Eberhart, R. L. Peterson, and K. Najafi, “3-Dimensional Blow Torch-Molding of Fused Silica Microstructures,” IEEE Journal of Microelectromechanical Systems, vol. 22, no. 6, Dec. 2013, pp.1276-1284.
     
  2. J. Cho, J.-K. Woo, J. Yan, R. L. Peterson, and K. Najafi, “Fused-Silica Micro Birdbath Resonator Gyroscope (µ-BRG),” IEEE Journal of Microelectromechanical Systems, vol. 23, no. 1, Feb. 2014, pp. 66-77.
     
  3. A. Darvishian, B. Shiari, J. Cho, T. Nagourney, and K. Najafi, “Anchor Loss in Hemispherical Shell Resonators,” in·Journal of Microelectromechanical Systems, vol. 26, no. 1, pp. 51–56, Febrary 2017.
     
  4. A. Darvishian, T. Nafourney, J. Cho, B. Shiari, and K. Najafi, “Thermoelastic Dissipation in Micromachined Birdbath Shell Resonators,” in·Journal of Microelectromechanical Systems, vol. 26, no. 4, pp. 758–772, August 2017.
     
  5. B. Shiari, T. Nagourney, A. Darvishian, J. Cho, and K. Najafi, "Simulation of Blowtorch Reflow of Fused Silica Micro-Shell Resonators", IEEE·Journal of Microelectromechanical Systems, vol. 26, no. 4, pp. 782-792. August 2017.
     
  6. S. Lee, J. Cho, and K. Najafi, "Fabrication of Vertical Comb Electrodes Using Selective Anodic Bonding," in Proc. 20th IEEE International Conference on Micro Electro Mechanical Systems (MEMS'07), Kobe, Japan, January 2007, pp. 349-352.
     
  7. S.-H. Lee, J. Cho, S. W. Lee, M. F. Zaman, F. Ayazi, and K. Najafi, "A Low-Power Oven-Controlled Vacuum Package Technology for High-Performance MEMSÓ, in Proc. 22th IEEE International Conference on Micro Electro Mechanical Systems (MEMS'09), Sorrento, Italy, January 2009, pp.753-756.
     
  8. J. Cho, J. A. Gregory, K. Najafi, "Single-Crystal-Silicon Vibratory Cylindrical Rate Integrating Gyroscope (CING)," in Proc. 16th IEEE International Conference on Solid-State Sensors, Actuators, and Microsystems (TRANSDUCERS'11), Beijing, China, June 2011, pp. 2813-2816.
     
  9. J. A. Gregory, J. Cho, K. Najafi, "MEMS Rate and Rate-Integrating Gyroscope Control with Commercial Software Defined Radio Hardware," in Proc. 16th IEEE International Conference on Solid-State Sensors, Actuators, and Microsystems (TRANSDUCERS'11), Beijing, China, June 2011, pp. 2394-2397.
     
  10. J. Cho, J. A. Gregory, and K. Najafi, "High-Q, 3KHz Single-Crystal-Silicon Cylindrical Rate-integrating Gyro (CING)," in Proc. 25th IEEE International Conference on Micro Electro Mechanical Systems (MEMS'12), Paris, France, January 2012, pp. 172-175.
     
  11. J. A. Gregory, J. Cho, and K. Najafi, "Characterization and Control of a High-Q MEMS Inertial Sensor using Low-Cost Hardware", in Proc. IEEE/ION Position Location and Navigation Symposium (PLANS 2012), Myrtle Beach, SC, May 2012, pp. 239-247.
     
  12. J. A. Gregory, J. Cho, and K. Najafi, "Novel Mismatch Compensation Methods for Rate-Integrating Gyroscopes", in Proc. IEEE/ION Position Location and Navigation Symposium (PLANS 2012), Myrtle Beach, SC, May 2012, pp. 252-258.
     
  13. J. Cho, J. Yan, J. A. Gregory, H. Eberhart, R. L. Peterson, and K. Najafi, “High-Q Fused Silica Birdbath and Hemispherical 3-D Resonators Made by Blow Torch Molding,” in Proc. 26th IEEE International Conference on Micro Electro Mechanical Systems (MEMS’13), Taipei, Taiwan, January 2013, pp. 177-180.
     
  14. J. Cho, J.-K. Woo, J. Yan, R. L. Peterson, and K. Najafi, “A High-Q Birdbath Resonator Gyroscope (BRG),” in Proc. 17th IEEE International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS’13), Barcelona, Spain, June 2013, pp. 1847-1850.
     
  15. J.-K. Woo, J. Cho, C. Boyd, K. Najafi, “Whole-Angle-Mode Micromachined Fused-Silica Birdbath Resonator Gyroscope (WA-BRG) ,” in Proc. 27th IEEE International Conference on Micro Electro Mechanical Systems (MEMS’14), San Francisco, CA, January 2014, pp. 20-23.
     
  16. J. Cho, T. Nagourney, A. Darvishian, B. Shiari, J.-K. Woo, and K. Najafi, "Fused Silica Micro Birdbath Shell Resonators With 1.2 Million Q and 43 Second Decay Time Constant," in Proc. 2014 Hilton Head Solid State Sensors, Actuators, and Microsystems Workshop, Hilton Head Island, SC, June 2014, pp. 103-104.
     
  17. J. Cho, J.-K. Woo, T. Nagourney, A. Darvishian, B. Shiari, C. Boyd, and K. Najafi, "Development of Fused-Silica Micro Birdbath Resonator Gyroscope," in Proc. Institute of Navigation (ION) Joint Navigation Conference 2014, Orlando, FL, June 2014.
     
  18. A. Darvishian, B. Shiari, J. Cho, T. Nagourney, and K. Najafi, "Investigation of Thermoelastic Loss Mechanism in Shell Resonators," in Proc. ASME 2014 International Mechanical Engineering Congress & Exposition (IMECE), Montreal, Canada, Nov. 2014.
     
  19. A. Darvishian, B. Shiari, J. Cho, and K. Najafi, "Effect of Imperfections on Fused Silica Shell Resonators," in Proc. ASME 2014 International Mechanical Engineering Congress & Exposition (IMECE), Montreal, Canada, Nov. 2014.
     
  20. J. Cho and K. Najafi, "A High-Q All-Fused Silica Solid-Stem Wineglass Hemispherical Resonator Formed Using Micro Blow Torching and Welding," in Proc. IEEE 2015 International Conference on Micro Electro Mechanical Systems (MEMS'15), Estoril, Portugal, January 2015, pp. 821-824.
     
  21. T. Nagourney, J. Cho, A. Darvishian, B. Shiari, and K. Najafi, "Effect of Metal Annealing on the Q-Factor of Metal-Coated Fused Silica Micro Shell Resonators," in Proc. IEEE 2015 International Symposium on Inertial Sensors and Systems (ISISS 2015), Hapuna Beach, HA, March 2015, pp.13-17.
     
  22. B. Shiari, A. Darvishian, T. Targourney, J. Cho, and K. Najafi, "A Comparison Between Experiments and FEM Predictions for Blowtorch Relow of Fused Silica Micro-Shell Resonators," in Proc. IEEE Transducers 2015, Anchorage,AK, June 2015, pp. 776-779.
     
  23. T. Nagourney, J. Cho, A. Darvishian, B. Shiari, and K. Najafi ,"Micromachined High-Q Fused Silica Bell Resonator with Compex Profile Curvature Realized Using 3D Micro Blowtorch Molding," in Proc. IEEE Tranducers 2015, Anchorage, AK, June 2015, pp. 1311-1314.
     
  24. B. Shiari, T. Nagourney, A. Darvishian, J. Cho, and K. Najafi, " Numerical Prediction of Stress Evolution During Blowtorch Reflow of Fused Silica Micro-Shell Resonators," in Proc. IEEE Inertial Sensors 2016, Laguna Beach, CA, Feb. 2016, pp. 13-16.
     
  25. T. Nagourney, J. Cho, A. Darvishian, B. Shiari, and K. Najafi, “130 Second Ring-Down Time and 3.98 Million Quality Factor in 10 kHz Fused Silica Micro Birdbath Shell Resonator,” in Proc. Hilton Head Workshop: A Solid-State Sensors, Actuators and Microsystems Workshop, Hilton Head Island, SC, 2016, pp. 408–411.
     
  26. J. Cho, T. Nagourney, A. Darvishian, and K. Najafi, " Ultra Conformal High Aspect-Ratio Small-Gap Capacitive Electrode Formation Technology For 3D Micro Shell Resonators," in IEEE 2017 International Conference on Micro Electro Mechanical Systems (MEMS'17), Las Vegas, NV, January 2017, pp. 1169-1172.
     
  27. B. Shiari, T. Nagourney, A. Darvishian, J. Cho, and K. Najafi, "Numerical Study of Impact of Surface Roughness on THERMOELASTIC Loss of Micro-Resonators", in IEEE 2017 International Symposium on Inertial Sensors & Systems, Kauai, HI, Mar. 2017, pp. 74-77.
     
  28. C. Boyd, J.-K. Woo, J. Cho, and K. Najafi, "Effect of Drive-Axis Displacement on MEMS Birdbath Resonator Gyroscope Performance", in IEEE 2017 International Symposium on Inertial Sensors & Systems, Kauai, HI, Mar. 2017, pp. 175-176.
     
  29. T. Nagourney, J. Cho, A. Darvishian, B. Shiari, and K. Najafi, "259 Second Ring-down Time and and 4.45 Million Quality Factor in 5.5 kHz Fused Silica Birdbath Shell Resonator", in Proc. IEEE 2017 Transducers Conference, Kaohsiung, Taiwan, June 2017, pp. 790-793.
     
  30. J.-K. Woo, C. Boyd, J. Cho, and K. Najafi, "Ultra-low Noise Transimpedance Amplifier And Interface circuit for high performance MEMS gyroscope", in Proc. IEEE 2017 Transducers Conference, Kaohsiung, Taiwan, June 2017, pp.1006-1009.

Conference/Seminar Presentations

  1. J. Cho, "Single-Crystal-Silicon Vibratory Cylindrical Rate Integrating Gyroscope (CING)," in IEEE International Conference on Solid-State Sensors, Actuators, and Microsystems (TRANSDUCERS’11), Beijing, China, June 2011.
     
  2. J. Cho, "High-Q, 3KHz Single-Crystal-Silicon Cylindrical Rate-integrating Gyro (CING)," in 25th IEEE International Conference on Micro Electro Mechanical Systems (MEMS’12), Paris, France, January 2012.
     
  3. (Invited) J. Cho, “DRIE of Single-Crystal-Si for MEMS Inertial Sensors”, in Lurie Nanofabrication Facility (LNF) DRIE Workshop, Ann Arbor, MI, February 2012.
     
  4. J. Cho, “High-Q Fused Silica Birdbath and Hemispherical 3-D Resonators Made by Blow Torch Molding,” in 26th IEEE International Conference on Micro Electro Mechanical Systems (MEMS’13), Taipei, Taiwan, January 2013.
     
  5. J.-K. Woo, J. Cho, C. Boyd, K. Najafi, “Whole-Angle-Mode Micromachined Fused-Silica Birdbath Resonator Gyroscope (WA-BRG) ,” in Proc. 27th IEEE International Conference on Micro Electro Mechanical Systems (MEMS’14), San Francisco, CA, January 2014, pp. 20-23.
     
  6. J. Cho, T. Nagourney, A. Darvishian, B. Shiari, J.-K. Woo, and K. Najafi, "Fused Silica Micro Birdbath Shell Resonators With 1.2 Million Q and 43 Second Decay Time Constant," 2014 Hilton Head Solid State Sensors, Actuators, and Microsystems Workshop, Hilton Head Island, SC, June 2014.
     
  7. (Invited) J. Cho et al., "Precision Rate Integrating Shell Microgyroscopes (PRISM)," Poster presentation at Defense Advanced Research Project Agency (DARPA) Microsystems Technology Office (MTO) Exposition, Arlington, VA, July 2014.
     
  8. T. Nagourney, J. Cho, A. Darvishian, B. Shiari, and K. Najafi, "Effect of Metal Annealing on the Q-Factor of Metal-Coated Fused Silica Micro Shell Resonators," in Proc. IEEE 2015 International Symposium on Inertial Sensors and Systems (ISISS 2015), Hapuna Beach, HA, March 2015, pp.13-17.
     
  9. B. Shiari, A. Darvishian, T. Targourney, J. Cho, and K. Najafi, "A Comparison Between Experiments and FEM Predictions for Blowtorch Relow of Fused Silica Micro-Shell Resonators," in Proc. IEEE Transducers 2015, Anchorage,AK, June 2015, pp. 776-779.
     
  10. B. Shiari, T. Nagourney, A. Darvishian, J. Cho, and K. Najafi, " Numerical Prediction of Stress Evolution During Blowtorch Reflow of Fused Silica Micro-Shell Resonators," in Proc. IEEE Inertial Sensors 2016, Laguna Beach, CA, Feb. 2016, pp. 13-16.
     
  11. C. Boyd, J.-K. Woo, J. Cho, and K. Najafi, "Improving Performance of MEMS Birdbath Resonator Gyroscope Through Drive Amplitude Optimization", in IEEE 2017 Interntional Symposium on Inertial Sensors & Systems, Kauai, HI, Mar. 2017, pp. 175-176.
     
  12. T. Nagourney, J. Cho, A. Darvishian, B. Shiari, and K. Najafi, "259 Second Ring-down Time and and 4.45 Million Quality Factor in 5.5 kHz Fused Silica Birdbath Shell Resonator", will be presented in IEEE 2017 Transducers Conference, Kaohsiung, Taiwan, June 2017.

© 2017 by Jae Yoong Cho