Na Jin Seo - Assistant Professor



Contact Information

Office Address:
USR 201D
115 East Reindl Way
Milwaukee, WI 53212
Phone: 414-229-2906
Fax: 414-229-6958
Email: najinseo@uwm.edu


Mailing Address:
P.O. Box 784
Department of Industrial and Manufacturing Engineering
University of Wisconsin-Milwaukee
Milwaukee, WI 53201

Please see also:
Industrial Engineering Department

Call for participants in a Hand and Grip Functions Study... See flyer for details. Sign up in the research registry.


Na Jin Seo

Education

Post-doc, Rehabilitation Institute of Chicago, Northwestern University, Chicago, IL, 2009
Ph.D., Industrial and Operations Engineering, University of Michigan, Ann Arbor, Michigan, 2007
M.S., Industrial and Operations Engineering, University of Michigan, Ann Arbor, Michigan, 2005
B.S., Mechanical Engineering, POSTECH, Pohang, South Korea, 2002

Research Interests

Ergonomics, Biomechanics, Hand Rehabilitation, Skin friction, Human motor control, Neuromechanics, Upper extremity musculoskeletal disorders.

Prof. Seo currently has openings for undergraduate/graduate/postdoctoral students with a strong academic and research background.

Journal Publications

  1. Slota GP, Enders LR, Seo NJ. Improvement of hand function using different surfaces and identification of difficult movement post stroke in the Box and Block Test, Applied Ergonomics, in Press, 2013.
  2. Enders LR, Hur P, Johnson MJ, and Seo NJ. Remote vibrotactile noinse improves light touch sensation in stroke survivors’ fingertips via stochastic resonance, Journal of NeuroEngineering and Rehabilitation, 10:105, 2013.
  3. Hur P, Motawar BR, Seo NJ, Role of glove use in the biomechanical response to handle perturbation, Journal of Electromyography and Kinesiology, in Press.
  4. Seo NJ. Involuntary contralateral hand activity during unilateral grip exertion in persons with chronic stroke. Journal of Hand Therapy, 26 (3) 272-7, 2013.
  5. Motawar BR, Hur P, Stinear JW, Seo NJ. Contribution of corticomotor inhibition in voluntary muscle relaxation, Experimental Brain Research, 221 (3) 299-308, 2012.
  6. Seo NJ, Enders LR. Hand grip function assessed by the Box and Block Test (BBT) is affected by object surfaces, Journal of Hand Therapy, 25 (4) 397-405, 2012.
  7. Hur P, Motawar BR, Seo NJ. Hand Breakaway Strength Model - Effects of glove use and handle shapes on a person’s hand strength to hold onto handles to prevent fall from elevation, Journal of Biomechanics, 45, 958-64, 2012.
  8. Shim JK, Karol S, Kim Y-S, Seo NJ, Kim YH, Kim Y, Yoon B. Tactile feedback plays a critical role in maximum finger force production, Journal of Biomechanics, 45 (3) 415-20, 2012.
  9. Seo NJ, Fischer HC, Bogey RA, Rymer WZ, Kamper DG. Effect of a serotonin antagonist on delay in grip muscle relaxation for persons with chronic hemiparetic stroke, Clinical Neurophysiology, 122, 796-802, 2011.
  10. Seo NJ, Shim JK, Engel AK, Enders LR. Grip surface affects maximum pinch force, Human Factors, 53 (6) 740-8, 2011.
  11. Seo NJ, Sindhu BS, Shechtman O. Influence of pain associated with musculoskeletal disorders on grip force timing, Journal of Hand Therapy, 24 (4) 335-43, 2011.
  12. Seo NJ, Fischer HC, Bogey RA, Rymer WZ, Kamper DG. Use of visual force feedback to improve digit force direction during pinch grip in persons with stroke - A pilot study, Archives of Physical Medicine & Rehabilitation, 92 (1) 24-30, 2011.
  13. Enders LR, Seo NJ. Phalanx force magnitude and trajectory deviation increased during power grip with an increased coefficient of friction at the hand-object interface, Journal of Biomechanics, 44 (8) 1447-53, 2011.
  14. Seo NJ, Armstrong TJ. Effect of elliptic handle shape on grasping strategies, grip force distribution, and twisting ability, Ergonomics, 54 (10) 961-70, 2011.
  15. Seo NJ, Rymer WZ, Kamper DG. Altered Digit Force Direction during Pinch Grip Following Stroke. Experimental Brain Research, 202 (4) 891-901, 2010.
  16. Seo NJ, Armstrong, T.J., Young, J.G. Effects of Handle Orientation, Gloves, Handle Friction and Elbow Posture on Maximum Horizontal Pull and Push Forces. Ergonomics, 53 (1) 92-101, 2010.
  17. Seo NJ, Rymer WZ, Kamper DG. Delays in Grip Initiation and Termination in Persons with Stroke: Effects of Arm Support and Active Muscle Stretch Exercise, Journal of Neurophysiology, 101, 3108-3115, 2009.
  18. Seo NJ, Armstrong TJ. Friction Coefficients in a Longitudinal Direction between the Finger Pad and Selected Materials for Different Normal Forces and Curvatures. Ergonomics, 52 (5) 609-616, 2009.
  19. Seo NJ. Dependence of Safety Margins in Grip Force on Isometric Push Force Levels in Lateral Pinch. Ergonomics, 52 (7) 840-847, 2009.
  20. Seo NJ, Armstrong TJ. Biomechanical Analysis for Handle Stability during Maximum Push and Pull Exertions. Ergonomics, 52 (12) 1568-1575, 2009.
  21. Seo NJ, Armstrong TJ, Drinkaus P. A Comparison of Two Methods of Measuring Static Coefficient of Friction at Low Normal Forces: A Pilot Study. Ergonomics, 52 (1) 121-135, 2009.
  22. 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) 37-48, 2008.
  23. Seo NJ, Armstrong TJ. Investigation of Grip Force, Normal Force, Contact Area, Hand Size, and Handle Size for Cylindrical Handles. Human Factors, 50 (5) 734-744, 2008.
  24. Seo NJ, Armstrong TJ, Chaffin DB, Ashton-Miller JA. The Effect of Handle Friction and Inward or Outward Torque on Maximum Axial Push Force. Human Factors, 50 (2) 227-236, 2008.
  25. Seo NJ, Armstrong TJ, Ashton-Miller JA, Chaffin DB. Wrist Strength is Dependent on Simultaneous Power Grip Intensity. Ergonomics, 51 (10) 1594-1605, 2008.
  26. Seo NJ, Kamper DG. 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, 2008.
  27. Seo NJ, Armstrong TJ, Ashton-Miller JA, Chaffin DB. 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, 2007.

Books

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

Garg, A., Campbell-Kyureghyan, N., Seo, N.J., Yalla, S.V., Kapellusch, J.M., 2009. Chapter 27 Distal Upper Extremities: Musculoskeletal Disorders, Job Evaluation and Design Principles, In: Anna, D.H., “The Occupational Environment – Its Evaluation, Control, and Management,” 3rd ed., American Industrial Hygiene Association (AIHA).

Conference Papers

  1. 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.
  2. 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 XXth meeting/American Society of Biomechanics 29th meeting, Cleveland, OH.
  3. Seo, N.J., Armstrong, T.J., Ashton-Miller, J. (2006). Grip Forces Measured with Different Methods. Proceedings of the 16th World Congress on Ergonomics, International Ergonomics Association, Maastricht, The Netherlands, Elsevier Science Inc.
  4. Seo, N.J., Brown, S.H. (2006). Dependence of Safety Margins on Isometric Push Force Levels. The Society for Neuroscience 36th annual meeting, Atlanta, GA.
  5. Seo, N.J., Armstrong, T.J.(2006). A Preferred Orientation of a Cylindrical Hand Dynamometer for Measuring Grip Force. The 28th International Congress on Occupational Health, Milan, Italy.
  6. Seo, N.J., Armstrong, T.J. (2006). The Effect of Torque Direction on Hand-object Coupling. The 30th Annual Meeting of the American Society of Biomechanics, Blacksburg, VA.
  7. 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.
  8. Seo, N.J., Armstrong, T.J., Dannecker, K.L. (2007). Effect of Simultaneous Grip on Wrist Strength. Proceedings of Human Factors and Ergonomics Society 51st Annual Meeting. Baltimore, MD: Human Factors and Ergonomics Society.
  9. Seo, N.J., Armstrong, T.J., Konishi, Y.(2007). The Effect of Handle Friction and Torque on Axial Push Force. The31st Annual Meeting of the American Society of Biomechanics, Palo Alto, CA.
  10. 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, 31st Annual Meeting. Palo Alto, CA.
  11. 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 ofHuman Factors and Ergonomics Society 52nd Annual Meeting. New York, NY: Human Factors and Ergonomics Society.
  12. Seo, N.J., Rymer, W.Z., Kamper, D.G. (2008). Delays in Grip Initiation and Termination in Persons with Stroke: Effects of Arm Support and Active Muscle Stretch Exercise. Brain Research Foundation10th Annual Neuroscience Day, Chicago, IL.
  13. Seo, N.J.(2009). Altered Digit Force Direction during Pinch Grip Following Stroke. Section on Research, American Physical Therapy Association, Pacific Grove, CA.
  14. 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.
  15. Seo, N.J., Kamper, D.G., (2009). Use of Force Feedback to Improve Grip Force Direction in Stroke Survivors. The Society for Neuroscience 39th annual meeting, Chicago, IL.
  16. Seo, N.J.(2010). Involuntary contralateral hand activity during unilateral grip exertion in persons with chronic stroke. Neuromechanics Symposium, Chicago, IL.
  17. Seo, N.J., Bogey, R.A., Kamper, D.G. (2010). Cyproheptadine hydrochloride reduced delay in grip muscle relaxation for persons with chronic stroke. The 40th Annual Meeting for the Society for Neuroscience, San Diego, CA.
  18. Engel, A.K.J., Stinear, J.W., Seo, N.J.(2010). Development of a protocol to detect modulation of short-term intracortical inhibition using transcranial magnetic stimulation. The 40th Annual Meeting for the Society for Neuroscience, San Diego, CA.
  19. Newbern, J.K., Seo, N.J.(2010). Inter-Limb Coupling During Unilateral Grip Exertion Following Stroke. The 40th Annual Meeting for the Society for Neuroscience, San Diego, CA.
  20. Hildebrand, J.J., Kapellusch, J.M., Seo, N.J.(2010). Time Study of the Box and Block Test for Different Block Surface Friction. The 40th Annual Meeting for the Society for Neuroscience, San Diego, CA.
  21. Allen, R.J., Sindhu, B.S., Shechtman, O., Seo, N.J.(2010). The effect of musculoskeletal pain on hand grip force and timing. The 40th Annual Meeting for the Society for Neuroscience, San Diego, CA.
  22. Engel, A.K.J., Enders, L.R., Keenan, K.G., Seo, N.J.(2010). Grip Surface Friction Affects Maximum Tip Pinch Force. The34th Annual Meeting of the American Society of Biomechanics, Providence, RI.
  23. Enders, L.R., Engel, A.K.J., Seo, N.J.(2010). High Coefficient of Friction at the Hand-Object Interface Contributes to Increased Maximum Grip Force by the Phalanxes During Power Grip. The34th Annual Meeting of the American Society of Biomechanics, Providence, RI.
  24. Cary, D.T., Enders, L.R., Seo, N.J.(2010). The Box and Block Test Score is Dependent upon Block Surface. The34th Annual Meeting of the American Society of Biomechanics, Providence, RI.
  25. Armstrong, T.J., Ashton-Miller, J.A., Seo, N.J., Woolley, C., Young, J.G. (2011). Prevention of Acute and Chronic Upper Limb Injuries – Get a Grip. Submitted for a session for the XXIII International Society of Biomechanics. (Invited)
  26. Scott, J.O., Brandenburg, A.R., Allard, B.M., Seo, N.J. (2011) Identification and Improvement of Difficult Hand Grip Movement Components for Stroke Survivors Using the Box and Block Test. The 35th Annual Meeting of the American Society of Biomechanics, Long Beach, CA.
  27. Pounds, C., Enders, L.R., Seo, N.J. (2011) Lack of Modulation of Maximum Pinch Force Depending on Grip Surface in Stroke Survivors. The 35th Annual Meeting of the American Society of Biomechanics, Long Beach, CA.
  28. Enders, L.R., Seo, N.J. (2011) Effects of Stroke-Induced Sensory And Motor Deficit on Phalanx Force Magnitude And Angular Deviation during Power Grip. The 35th Annual Meeting of the American Society of Biomechanics, Long Beach, CA.
  29. Hur, P., Motawar, B.R., Seo, N.J. (2011) Effects of Glove and Ladder Rung Design on Prevention of Ladder Fall. The 35th Annual Meeting of the American Society of Biomechanics, Long Beach, CA.
  30. Motawar, B.R.,Hur, P., Seo, N.J. (2011) Roles of Cutaneous Sensation and Gloves with Different Coefficients of Friction on Fall Recovery during Simulated Ladder Falls. The 35th Annual Meeting of the American Society of Biomechanics, Long Beach, CA.
  31. Shechtman, O., Sindhu, B.S., Seo, N.J. (2011) The Effects of Upper Extremity Injury on Maximal Grip Effort. The American Society of Hand Therapists 34th Annual Meeting, Nashville, TN.
  32. Enders, L.R., Seo, N.J. (2012). Stochastic Resonance Improves Sensation and Pinch Grip in Stroke Survivors. Neuromechanics Symposium, Chicago, IL.
  33. Motawar, B.R., Seo, N.J. (2012). Role of inhibitory motor cortical pathways during voluntary relaxation following a maximal power grip in chronic stroke survivors. Neuromechanics Symposium, Chicago, IL.
  34. Lomo-Tettey, D., Seo, N.J. (2012). New Assistive Glove for Stroke Survivors Using Advanced Dynamic Biomechanical Model. Neuromechanics Symposium, Chicago, IL.
  35. Hur, P., Seo, N.J. (2012). Effect of Vibrotactile Stimulation on the Reaction Time to Handle Perturbation. Neuromechanics Symposium, Chicago, IL.
  36. Khajehnezhad, M., Seo, N.J. (2012). Improving driving safety by determining the safest steering wheel control based on the level of impairment for stroke survivors. Neuromechanics Symposium, Chicago, IL.
  37. Wan, Y.-H., Seo, N.J. (2012). Increase of Hand Breakaway Strength for Prevention of Ladder Fall by Optimizing Rung Design. Neuromechanics Symposium, Chicago, IL.
  38. Sotelo, N.,Motawar, B.,Seo, N.J. (2012). Modulation of the intracortical inhibition during grip relaxation. 13th RCMI International Symposium on Health Disparities, San Juan, Puerto Rico.
  39. Brandenburg AR, Enders LR, Seo, N.J. (2012). Use of high-friction objects to improve hand grip function assessed by the Box and Block Test for older adults. The 42nd Annual Meeting of the Society for Neuroscience, New Orleans, LA.
  40. Weyers BL, Enders LR, Seo, N.J. (2012). Age-Related Changes in the Control of Pinch Grip Force. The 42nd Annual Meeting of the Society for Neuroscience, New Orleans, LA.
  41. Lambert LR, Enders LR, Seo, N.J. (2012). Inter-limb transfer of grip coordination as a rehabilitation strategy for women following stroke. The 42nd Annual Meeting of the Society for Neuroscience, New Orleans, LA.
  42. Motawar BR, Seo, N.J. (2012). Modulation of the intracortical inhibition for grip relaxation in chronic stroke survivors. The 42nd Annual Meeting of the Society for Neuroscience, New Orleans, LA.
  43. Lomo-Tettey DN, Hur P, Seo, N.J. (2012). Improving an Assistive Glove for Stroke Survivors Using Advanced Biomechanical Model. The 42nd Annual Meeting of the Society for Neuroscience, New Orleans, LA.
  44. Enders LR, Seo, N.J. (2012). Stochastic Resonance Improves Sensation and Pinch Grip in Stroke Survivors. The 42nd Annual Meeting of the Society for Neuroscience, New Orleans, LA.
  45. Hur P, Seo, N.J. (2012). Effect of Vibrotactile Stimulation on the Reaction Time to Handle Perturbation. The 42nd Annual Meeting of the Society for Neuroscience, New Orleans, LA.
  46. Arunkumar J, Hur P, MotawarB, Seo, N.J. (2013). Low-cost Virtual Reality Game for Upper Limb Rehabilitation Using Kinect and P5 Glove. The 37th Annual Meeting of the American Society of Biomechanics, Omaha, NE.
  47. Hur P, Tseng Y-L, Seo NJ (2013). Somatosensory Cortex Activity in Response to Fingertip Stimulation Can Increase with Remote Subthreshold Vibrotactile Noise: An EEG Study. The 37th Annual Meeting of the American Society of Biomechanics, Omaha, NE.
  48. Crocher V, Seo NJ (2013). Impact of Wheel Control Methods on Driving Safety and Efficiency. The 37th Annual Meeting of the American Society of Biomechanics, Omaha, NE.
  49. Lambert L, Slota GP, Enders LR, Seo NJ (2013). Altered Power Grip Force Distribution and Phalanx Force Trajectory for Older Individuals. The 37th Annual Meeting of the American Society of Biomechanics, Omaha, NE.
  50. Enders LR, Seo NJ (2013). Stroke Induced Sensory Deficit Decreases Phalanx Force Control During Power Grip. The 37th Annual Meeting of the American Society of Biomechanics, Omaha, NE.
  51. Tseng Y-L, Seo NJ (2013). Effect of Sensory Manipulation on the Ability to Maintain Pinch Force. The 37th Annual Meeting of the American Society of Biomechanics, Omaha, NE.
  52. Hur P, Salehi SH, Seo NJ (2013). Development of Biomechanical Index Finger Model to Predict Multi-segmental Grip Forces for Varying Finger Postures. The 37th Annual Meeting of the American Society of Biomechanics, Omaha, NE.
  53. Slota GP, Seo NJ (2013). Handle Design Based on Pressure Distribution Patterns: Effect of Handle Shapes and Task Direction. The 37th Annual Meeting of the American Society of Biomechanics, Omaha, NE.
  54. Ewert C, Crocher V, Seo NJ (2013). Computerized Mallet Classification for Brachial Plexus Palsy. The 37th Annual Meeting of the American Society of Biomechanics, Omaha, NE.
  55. Crocher V, Hur P, Seo NJ (2013). Low-cost virtual rehabilitation games: House of Quality to meet patient expectations. International Conference on Virtual Rehabilitation, Philadelphia, PA.
  56. Linz W, Michalak G, MasoudiMotlagh M, Seo NJ, Ranji M (2013). Hand function assessment of stroke patients using non-invasive surface near-infrared spectroscopy. Great Lake Biomedical Conference, GE healthcare, Milwaukee, WI, April 2013 (awarded third place).
  57. Linz W, Seo NJ, Ranji M (2013). Oxygenation changes in the skeletal muscles of stroke patients by surface near-infrared spectroscopy. Submitted to Design and Quality for Biomedical Technologies VI, the international society for optics and photonics BiOS

Grants

  1. American Heart Association (AHA) Scientist Development Grant 2011-2015 (Seo PI).
    Title: Delays in muscle relaxation: novel approach to neuromechanism-based stroke rehabilitation
    Role: PI
  2. National Institute of Occupational Safety and Health (NIOSH) R21 2012-2014 (Seo & Beschorner MPI).
    Title: Quantifying the recovery response and the role of hand strength during ladder falls.
  3. National Institute on Disability and Rehabilitation Research (NIDRR) 2011-2013 (Seo PI).
    Title: Role of sensation and sensory stimulation to improve hand grip in persons with stroke
  4. NIH R24 subaward from Rehabilitation Engineering Research Network Center 2012-2014 (Seo PI).
    Title: Improving assistive gloves for stroke survivors using dynamic biomechanical models and optimization
  5. Wisconsin Women’s Health Foundation 2010-2014 (Seo PI)
    Title: Development of gender-specific rehabilitation strategies for women following stroke
  6. Boston Rehabilitation Outcomes Center 2013-2015 (Seo PI)
    Title: Development of a low-cost computerized clinical assessment tool for movement quality
  7. Clinical & Translational Science Institute of Southeastern Wisconsin (CTSI) 2012-2014 (Seo PI)
    Title: Role of tactile sensation on hand motor control and functional recovery after stroke – an fMRI study
  8. WiSys Applied Research Grant 2013-2014 (Seo & Webster PI)
    Title: Development of a wearable, portable TheraBracelet to enhance touch sensation and dexterity of the hand of neurologic patients via vibrotactile stimulation
  9. University of Wisconsin-Milwaukee Cultures & Communities 2013-2014 (Seo & Graven PI)
    Title: Support the Elders' Physical Capabilities and Well-being through Robotic Development
  10. Medical College of Wisconsin 2012-2013 (Tchekanov PI)
    Title: Effect of botulinum toxin of the long finger flexor muscles on grip force control in stroke
  11. University of Wisconsin Intercampus Research Incentive Grant 2012-2013 (Seo & Webster PI)
    Title: Development of a hand sensory prosthesis for stroke survivors
  12. University of Wisconsin-Milwaukee Research Growth Initiative 2010-2011 (Seo PI)
    Title: Ergonomic interventions for altered grip force direction in stroke survivors
  13. American Heart Association Fellowships for students 2012-2014
  14. NIOSH ERC 2010-2014