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H. Ma, J.H. Lang, A.H. Slocum, Calibration-free Measurement of Liquid Permittivity and Conductivity using Electrochemical Impedance Test Cell with Servomechanically Adjustable Cell Constant, IEEE Sensors. (Accepted)

O.T. Ogunnika, M. Scharfstein, R.C. Cooper, H. Ma, J.L. Dawson, S.B. Rutkove, A Handheld Electrical Impedance Myography Probe for the Assessment of Neuromuscular Disease, in Proceedings of the IEEE Engineering in Medicine and Biology Conference, Vancouver, Canada, 2008. [pdf]

W. Wichakool, B.J. Pierquet, K.V. Durand, B.B. Hsu, R. Sheridan, H. Ma, Magnetic Endotracheal Tubes Imaging Device, in Proceedings of the IEEE Engineering in Medicine and Biology Conference, Vancouver, Canada, 2008. [pdf]

F.C. Chen, H. Wu, P.L. Hsu, B.A. Stronger, R. Sheridan, H. Ma, SmartPad: A Wireless, Adhesive-Electrode-Free, Autonomous ECG System, in Proceedings of the IEEE Engineering in Medicine and Biology Conference, Vancouver, Canada, 2008. [pdf]

H. Knight, J. Lee, H. Ma, Chair Alarm for Patient Fall Prevention based on Gesture Recognition and Interactivity, in Proceedings of the IEEE Engineering in Medicine and Biology Conference, Vancouver, Canada, 2008. [pdf]

H. Ma, J.H. Lang, A.H. Slocum, Permittivity Measurements using Adjustable Microscale Electrode Gaps between mm-Sized Spherical Electrodes, Review of Scientific Instruments, Vol. 79, No. 3, p. 035105, 2008. [pdf]

H. Ma, J.H. Lang, A.H. Slocum, Design of an Electrochemical Impedance Test Cell with Servomechanically Adjustable Cell Constant, in Proceedings of the IEEE Sensors Conference, pp. 1233-1236, Atlanta, GA, October 2007. [pdf]

H. Ma, J.H. Lang, A.H. Slocum, Technique for Measuring the Dielectric Constant of Liquids and Gases without the Use of Calibration Standards, in Proceedings of MicroTAS Conference, pp. 1692-1694, Paris, France, October 2007.

H. Ma, A.H. Slocum, Design of a Flexural Mechanism for Varying the Separation between Spherical Electrodes with Nanometer Accuracy, in Proceedings of the European Society for Precision Engineering and Nanotechnology, Bremen, Germany, May 2007.

H. Ma, A.H. Slocum, A Mechanism for Creating Variable Nanometer Gaps, in Proceedings of the American Society for Precision Engineering Annual Meeting, Monterey, CA, October 2006.

H. Ma, A.H. Slocum, A Flexible-Input, Desired-Output (FIDO) Motor Controller for Engineering Design Classes, IEEE Transactions on Education, Vol. 49, No. 1, 113-121, 2006. [pdf]

J. White, H. Ma, J. Lang, A.H. Slocum, An Instrument to Control Parallel Plate Separation for Nanoscale Flow Control, Review of Scientific Instruments, Vol. 74, No. 11, 4869-4875, 2003. [pdf]

H. Ma, J. White, J.A. Paradiso, and A.H. Slocum, Sub-nanometer Displacement Sensing for the Nanogate, in Proceedings of IEEE Sensors, pp. 1086-1091, Toronto, Ontario, October 2003.

H. Ma, J.A. Paradiso, The FindIT Flashlight: Responsive Tagging Based on Optically Triggered Microprocessor Wakeup, in G. Borriello and L.E. Holmquist (Eds.): UbiComp, LNCS 2498, pp. 160-167, Gotenborg, Sweden, 2002. [pdf]

MIT ORCA team, ORCA-V: An Autonomous Underwater Vehicle, Journal paper for the 2002 AUVSI and ONR Autonomous Underwater Vehicle Competition, San Diego, CA, USA, 2002. [pdf]

H. Ma, "What the Heck are Photonic Crystals?", Canadian Undergraduate Physics Conference, Quebec City, Quebec, November, 2000. (Won first prize for the best overall presentation)