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Search Publications by

Ya-Shian Li-Baboud (Fed)

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Displaying 1 - 25 of 61

A Peg-in-Hole Test and Analysis Method for Exoskeleton Evaluation

March 7, 2022
Ann Virts, Roger V. Bostelman, Soocheol Yoon, Ya-Shian Li-Baboud, Mili Shah
Work-place MusculoSkeletal Disorders (WMSD) continue to be the most significant source of industrial work force injuries. Exoskeletons are emerging as personal protective equipment (PPE) for sustained, repetitive, or intensive industrial tasks. This

Foundational PNT Profile: Applying the Cyber Security Framework for the Responsible Use of Positioning, Navigation and Timing (PNT) Services NISTIR 8323

February 11, 2021
James J. McCarthy, Karen Reczek, Michael Bartock, YaShian Li-Baboud, Suzanne Lightman, Arthur Scholz, Theresa Suloway, Doug Northrip, Joesph Brule
The national and economic security of the United States (US) is dependent upon the reliable functioning of critical infrastructure. Positioning, Navigation and Timing (PNT) services are widely deployed throughout the critical infrastructure. A disruption

Towards Measurement of Advanced Mobile Manipulator Performance for Assembly Applications

August 11, 2020
Roger V. Bostelman, YaShian Li-Baboud, Soocheol Yoon, Mili Shah, Omar Y. Aboul-Enein
Advanced mobile manipulators offer the manufacturing industry the potential of a highly flexible system to perform precision assembly tasks where the environment and the system are subject to uncertainties. Developing precision performance measurement

Development of a Kinematic Measurement Method for Knee Exoskeleton Fit to a User

August 4, 2020
Roger V. Bostelman, YaShian Li-Baboud, Karl Van Wyk, Mili Shah
Exoskeletons are now being marketed by several manufacturers and yet there are currently no defined methods to measure the exoskeleton fit to the user. Proper exoskeleton fit to user impacts the safety of the human robot interaction. In this paper, we

Towards Standard Exoskeleton Test Methods for Load Handling

May 9, 2019
Roger V. Bostelman, Ya-Shian Li-Baboud, Ann Virts, Soocheol Yoon, Mili Shah
Exoskeletons are now being marketed by several manufacturers and yet there are currently no standard test methods to compare exoskeletons to task. The National Institute of Standards and Technology (NIST) has been a key contributor to the formation of a

NIST Smart Grid Interoperability Test Tools

February 8, 2019
Dhananjay Anand, Kevin G. Brady, Yuyin Song, Cuong T. Nguyen, Kang B. Lee, Gerald J. FitzPatrick, Allen R. Goldstein, YaShian Li-Baboud
The National Institute of Standards and Technology (NIST), participated in the Universal Communication Architecture International User Group (UCAIug) Interoperability (IOP) Test Event on October 14-19, 2017 in New Orleans, Louisiana. The objective of the

A Calibration of Timing Accuracy in the NIST Cyber-Physical Systems Testbed

December 18, 2018
Marc A. Weiss, YaShian Li-Baboud, Dhananjay Anand, Kevin G. Brady, Paul A. Boynton, Cuong T. Nguyen, Martin J. Burns, Avi M. Gopstein
We propose a general methodology for assessing the time accuracy and uncertainties and report results from a project to calibrate timing in the NIST CPS and Smart Grid Testbeds. We measured clock synchronization accuracy and stability as well as latencies

A Calibration of Timing Accuracy in NIST Cyber-Physical Systems Testbed

October 3, 2018
Marc A. Weiss, Ya-Shian Li-Baboud, Dhananjay Anand, Paul A. Boynton, Kevin Gerard Brady, Martin Burns
We report results from a project to calibrate timing in the NIST CPS and Smart Grid Testbeds. We measured clock synchronization accuracy and stability as well as latencies for potential experiments in the testbeds. We determined calibrations of GPS

Measurement Tools for Substation Equipment: Testing the Interoperability of protocols for Time Transfer and Communication

October 3, 2018
Dhananjay Anand, YaShian Li-Baboud, Kevin G. Brady, Yuyin Song, Kang Lee, Cuong Nguyen, Gerald FitzPatrick, Allen R. Goldstein
A test harness was designed and developed at the National Institute of Standards and Technology (NIST) to study the interoperability of the Precision Timing Protocol-Power Profile (PTP) and other communication standards for substation automation

TMA: An Efficient Timestamp-Based Monitoring Approach to Test Timing Constraints of Cyber-Physical Systems

June 29, 2018
Mohammadreza Mehrabian, Mohammad Khayatian, Ahmed Mousa, Aviral Shrivastava, Patricia Derler, Ya-Shian Li-Baboud, Dhananjay Anand, Edward Griffor, Hugo Andrade, John Eidson
Formal specifications on temporal behavior of Cyber-Physical Systems (CPS) is essential for verification of performance and safety. Existing solutions for verifying the satisfaction of temporal constraints on a CPS are compute and resource intensive since

Revision of IEEE Std C37.238, Power Profile for IEEE-1588: Why The Big Changes?

June 15, 2018
Mark Adamiak, Galina Antonova, A. Apostolov, H. Kirrmann, F. Becker, J. Bougie, C. Brunner, W. Dickerson, M. Dood, D. Giarratano, R. Graf, H. Falk, C. Huntley, D. Ingram, Ya-Shian Li-Baboud, K. Martin, R.J. Murphy, B. Muschlitz, M. Renz, G. Rzepka, V. Skendzic, T. Tibbals, B. Vandiver, S. Zimath
Revision and renewal of standards is normally a routine process. This paper describes why revision of the Institute of Electrical and Electronics Engineers (IEEE) C37.238 standard was anything but routine, the reasons why a new approach was needed, and the

Framework for Cyber-Physical Systems: Volume 3, Timing Annex

September 28, 2017
David A. Wollman, Marc A. Weiss, YaShian Li-Baboud, Edward R. Griffor, Martin J. Burns
Cyber-Physical Systems (CPS) comprise interacting digital, analog, physical, and human components engineered for function through integrated physics and logic. NIST established the CPS Public Working Group (CPS PWG) to bring together a broad range of CPS

Timestamp Temporal Logic (TTL) for Time Testing of Cyber-Physical Systems

September 27, 2017
Mohammadreza Mehrabian, Mohammad Khayatian, Aviral Shrivastava, John Eidson, Patricia Derler, Hugo A. Andrade, Ya-Shian Li-Baboud, Edward Griffor, Marc A. Weiss, Kevin Stanton
In order to test the performance and verify the correctness of Cyber-Physical Systems (CPS), the timing constraints on the system behavior must be met. Signal Temporal Logic (STL) can efficiently and succinctly capture the timing constraints on a given

Mobile Manipulator Performance Measurement Data

June 27, 2017
Roger V. Bostelman, YaShian Li-Baboud, Steven Legowik, Tsai H. Hong, Sebti Foufou
The National Institute of Standards and Technology, Intelligent Systems Division has collected data detailing the performance measurement of a mobile manipulator, i.e., an automatic guided vehicle (AGV) with onboard robot arm from two different

A Testbed to Verify Timing Behavior of Cyber-Physical Systems

June 18, 2017
Aviral Shrivastava, Mohammad Khayatian, Mohammadreza Mehrabian, Hugo A. Andrade, Patricia Derler, Ya-Shian Li-Baboud, Edward Griffor, Marc A. Weiss, John Eidson, Kevin Stanton
Time is a foundational aspect of Cyber-Physical Systems (CPS). Correct time and timing of system events is critical to optimized responsiveness to the environment, in terms of timeliness, accuracy and precision in the knowledge, measurement, prediction


January 30, 2017
Marc A. Weiss, Alison Silverstein, Francis Tuffner, Ya-Shian Li-Baboud
Today, the principal way that power system owners and operators use precision timing is for fault recording, protection system operation and in synchrophasor applications. Synchrophasor applications have among the most stringent precision time and time

Timing Challenges in the Smart Grid

January 19, 2017
YaShian Li-Baboud, Cuong T. Nguyen, Marc A. Weiss, Dhananjay Anand, Allen R. Goldstein, Jason Allnutt, Bob Noseworthy, Ravi Subramaniam
Correct time and timing is one of the foundational elements in enabling the communication and orchestration of technologies for accurate and optimal wide area monitoring, protection and control in the power industry. NIST and IEEE-SA conducted a workshop

Time in Cyber-Physical Systems

October 2, 2016
Marc A. Weiss, YaShian Li-Baboud, Aviral Shrivastava, Mohammad Khayatian, Patricia Derlery, Hugo A. Andrade, Sundeep Chandhoke, Kevin Stanton, John Eidson
Many modern CPS, especially industrial automation systems, require the actions of multiple computational systems to be synchronized at much higher rates than is possible through ad hoc designs. Fundamental research is needed in synchronizing clocks of

Towards a Reconfigurable Distributed Testbed to Enable Advanced Research and Development of Timing and Synchronization in Cyber-Physical Systems

December 8, 2015
Aviral Shrivastava, J C. Eidson, Marc A. Weiss, Ya-Shian Li-Baboud, Hugo Andrade, Patricia Derler, Kevin Stanton
Timing and synchronization play a key role in advanced cyber-physical systems (CPS). Precise timing, as often required in safety-critical CPS, depends on hardware support for enforcement of periodic measure, compute, and actuate cycles. For general CPS

Investigation of PMU Response to Leap Second: 2015

August 24, 2015
Allen R. Goldstein, Dhananjay Anand, YaShian Li-Baboud
Between 22:30:00 June 30, 2015, and 00:30:00 July 2, 2015, UTC, the National Institute of Standards and Technology (NIST) tested eight Phasor Measurement Units (PMUs) to investigate their response to the leap second adjustment to UTC which occurred

Systematic Measurement of Marginal Mark Types on Voting Ballots

July 24, 2015
Andrea V. Bajcsy, Ya-Shian Li-Baboud, Mary C. Brady
The presence of marginal marks on voting ballots is a ubiquitous problem in voting systems and it is a common source of dispute during federal and state-level elections. As of today, marginal marks are neither clearly countable as votes or as non-votes by

Automated Ranking of Stem Cell Colonies by Translating Biological Rules to Computational Models

September 20, 2014
Adele P. Peskin, Steven P. Lund, YaShian Li-Baboud, Michael W. Halter, Anne L. Plant, Peter Bajcsy
This paper addresses the problem of automating an image ranking process for stem cell colonies. We automate the manual process in a novel way: instead of fitting off-the-shelf image features and colony ranks to prediction models, we define a new feature

1588 Power Profile Test Plan

July 7, 2014
Carol Perkins, Jeff Laird, Ryan McEachern, Bob Noseworthy, Julien M. Amelot, Ya-Shian Li-Baboud, Kevin G. Brady
The National Institute of Standards and Technology (NIST) is an agency of the U.S. Department of Commerce, facilitating the industry adoption of IEEE Standard C37.238 for the use of IEEE 1588 in Power Systems Applications in support of the Smart Grid. The