Na Jin Seo, Ph.D.

Research Associate

Email : n-seo@northwestern.edu

Phone : 312-238-1273

Rehabilitation Institute of Chicago

CV (updated in February 2009)

 

 

 

 

 

Research Interests Ergonomics Biomechanics Hand Rehabilitation Skin friction Human motor control Neuromechanics Upper extremity musculoskeletal disorders

Teaching BME422/BME522 Mathematical Methods for Biomedical Engineers - Fall 2008 IOE334 Ergonomics lab – Fall 2006, Winter 2006 IOE333 Ergonomics – Fall 2005, Fall 2004

Papers

• Seo, N.J., Rymer, W.Z., Kamper, D.G., Delays in Grip Initiation and Termination in Persons with Stroke: Effects of Arm Support and Active Muscle Stretch Exercise. Forthcoming, Journal of Neurophysiology.

• Seo, N.J., Rymer, W.Z., Kamper, D.G., Altered Grip Force Direction at Digits Following Stroke. In preparation.

• Seo, N.J., Dependence of Safety Margins in Grip Force on Isometric Push Force Levels. Accepted, Ergonomics.

• Seo, N.J., Armstrong, T.J., Drinkaus, P., 2009. A Comparison of Two Methods of Measuring Static Coefficient of Friction at Low Normal Forces: A Pilot Study. Ergonomics, 52 (1) 121-135.

• Seo, N.J., Armstrong, T.J., Friction Coefficients in a Longitudinal Direction between the Finger Pad and Selected Materials for Different Normal Forces and Curvatures. Accepted, Ergonomics.

• Seo, N.J., Kamper, D.G., 2008. Effect of Arm Posture, Arm Support, and Muscle Stretch on Sustained Finger Flexor Activity Following Stroke. Proceedings of the 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vancouver, Canada.

• Seo, N.J., Armstrong, T.J., Ashton-Miller, J.A., Chaffin, D.B., 2008. Wrist Strength is Dependent on Simultaneous Power Grip Intensity. Ergonomics, 51 (10) 1594-1605.

• Seo, N.J., Armstrong, T.J.. Investigation of Grip Force, Normal Force, Contact Area, Hand Size, and Handle Size for Cylindrical Handles. Human Factors: Journal of Human Factors and Ergonomics Society, 50 (5) 734-744.

• Seo, N.J., Armstrong, T.J., Chaffin, D.B., Ashton-Miller, JA  The Effect of Handle Friction and Inward or Outward Torque on Maximum Axial Push Force. Human Factors, 50 (2) April 2008, 227-236.*

• Seo, NJ, Armstrong, TJ, Chaffin, DB & Ashton-Miller, JA Inward Torque and High-Friction Handles Can Reduce Required Muscle Efforts for Torque Generation . Human Factors, 50 (1) Feb 2008, 37-48.*

• Gusich, B., Armstrong, T.J., Seo, N.J., Grieshaber, D.C., 2008  Development of a computerized model for evaluation of manual insertion of flexible hoses in automobile assembly. Proceedings of Human Factors and Ergonomics Society 52nd Annual Meeting. New York, NY: Human Factors and Ergonomics Society.

• Seo, N.J., Armstrong, T.J., Ashton-Miller, J.A., Chaffin, D.B., 2007  The Effect of Torque Direction and Cylindrical Handle Diameter on the Coupling between the Hand and a Cylindrical Handle. Journal of Biomechanics, 40, 3236-3243.

  See CV for others.

Reports

Seo, N.J., Development of a Biomechanical Model for Torque and Thrust Strength on Cylindrical Handles. NIOSH Pilot Project Final Report. Funding Period July 2006-June 2007.

Book

Seo, N.J., 2008. Biomechanical Models of Hand Coupling for Axial Torque and Push Exertions. VDM Verlag Dr. Müller. ISBN: 978-3-8364-6431-4

Proceedings / Abstracts / Presentations

1. Seo, N.J., Kamper, D.G., 2009 Excessive Shear Force at the Digits May Contribute to Unstable Grip Following Stroke. The ASME Summer Bioengineering Conference, Lake Tahoe, CA.

2. Seo, N.J., Armstrong, T.J., Dannecker, K.L. (2007). Effect of Simultaneous Grip on Wrist Strength. Human Factors and Ergonomics Society 51^st Annual Meeting.
3.  Seo, N.J., Armstrong, T.J., Konishi, Y. (2007). The Effect of Handle Friction and Torque on Axial Push Force. American Society of Biomechanics, 31^st Annual Meeting.

             Poster - The Effect of Handle Friction, Inward/Outward Torque, and Handle Stability on Maximum Axial Push Force

4. Seo, N.J., Armstrong, T.J., Dannecker, K.L. (2007). The Effect of Friction and Arm Posture on Max Push / Pull Force. American Society of Biomechanics, 31^st Annual Meeting.
5. Seo, N.J., Armstrong, T.J., Ashton-Miller, J. (2006) Grip Forces Measured with Different Methods. In Proceedings of the 16th World Congress on Ergonomics, International Ergonomics Association, Maastricht, Netherlands.
6. Seo, N.J., Armstrong, T.J. (2006) A preferred orientation of a cylindrical hand dynamometer for measuring grip force. The 28^th International Congress on Occupational Health, Milan, Italy.
7.  Seo, N.J., Armstrong, T.J. (2006) The Effect of Torque Direction on Hand-object Coupling. The 30^th Annual Meeting of the American Society of Biomechanics, Blacksburg, VA.

8. Seo, N.J., Brown, S.H. (2006) Dependence of safety margins on isometric push force levels. The Society for Neuroscience 36^th Annual Meeting, Atlanta, GA.

9. Seo, N.J., Armstrong, T.J., Ashton-Miller, J., Chaffin, D.B. (2006) Development of a Biomechanical Model for Grip, Twist and Friction - How to Open a Pickle Jar? 2006 Engineering Graduate Student Symposium, Ann Arbor, MI.

             Poster - Development of a Biomechanical Model for Grip, Twist and Friction - How to Open a Pickle Jar?

10. Seo, N.J., Armstrong, T. J., Drinkaus, P. (2005) Methods to Measure Static Coefficient of Friction between Hand and Other Materials. The International Society of Biomechanics XXth meeting / American Society of Biomechanics 29th meeting, Cleveland, OH.           

               Poster- Measure of Static Coefficient of Friction at Low Hand Contact Forces

11. Grieshaber, D.C., Armstrong, T.J., Seo, N.J. (2005) Forearm Muscle Activity During Three Hose Insertion Tasks As Measured By Surface Electromyography of the Flexor Digitorum Superficialis Muscle. The International Society of Biomechanics XX^th meeting/American Society of Biomechanics 29^th meeting, Cleveland, OH.

*Copyright © 2008Human Factors and Ergonomics Society. All rights reserved. Making more than one copy of this paper is prohibited except by written permission of   HFES .