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Search Publications by: Ya-Shian Li-Baboud ()

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Displaying 26 - 50 of 75

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

June 29, 2018
Author(s)
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
Author(s)
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
Author(s)
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
Author(s)
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
Author(s)
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
Author(s)
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

THE USE AND CHALLENGES OF PRECISE TIME IN ELECTRIC POWER SYNCHROPHASOR SYSTEMS

January 30, 2017
Author(s)
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
Author(s)
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
Author(s)
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
Author(s)
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
Author(s)
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
Author(s)
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
Author(s)
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
Author(s)
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

Depicting Web Images for the Blind and Visually Impaired

December 9, 2013
Author(s)
Andrea Bajcsy, Ya-Shian Li-Baboud, Mary C. Brady
A prototype to translate web graph and map images into 3D printed models in order to give the blind and visually impaired access to voting and election information.

Towards Timely Intelligence in the Power Grid

February 25, 2013
Author(s)
YaShian Li-Baboud, Julien M. Amelot, Dhananjay Anand, Gerard N. Stenbakken, Thomas L. Nelson, James Moyne
One of the key lessons learned from the 2003 Northeast Blackout in the United States was the need for improved timing. The problem began as an isolated issue, but cascaded through the Northeastern grid. Timely situational awareness would likely have

Data Quality for High Content Screening

September 3, 2012
Author(s)
YaShian Li-Baboud, Oleg Aulov, Peter Bajcsy
TO HAVE CONFIDENCE IN THE KNOWLEDGE GLEANED FROM DATA, IT IS ESSENTIAL TO VERIFY THE QUALITY OF THE DATA SOURCES AND TO HAVE A MEANS OF QUANTIFYING THE POTENTIAL UNCERTAINTIES DUE TO THE QUALITY OF DATA FOR MAKING CRITICAL, INTELLIGENT DECISIONS. HIGH

An IEEE 1588 Performance Testing Dashboard for Power Industry Requirements

March 22, 2012
Author(s)
Julien M. Amelot, YaShian Li-Baboud, Clement Vasseur, Jeffrey Fletcher, Dhananjay Anand, James Moyne
The numerous time synchronization performance requirements in the Smart Grid entails the need for a set of common metrics and test methods to verify the ability of the network system and its components to meet the power industry�s accuracy, reliability and

An IEEE 1588 Performance Testing Dashboard for Power Industry Requirements

September 12, 2011
Author(s)
Julien M. Amelot, Ya-Shian Li-Baboud, Clement Vasseur, Jeffrey Fletcher, Dhananjay Anand, James Moyne
The numerous time synchronization performance requirements in the Smart Grid entails the need for a set of common metrics and test methods to verify the ability of the network system and its components to meet the power industry's accuracy, reliability and

Smart Clocks Have a Hand in the Smart Grid

July 29, 2011
Author(s)
Jeffrey Fletcher, Dhananjay Anand, Maruthi Chaluvadi, Julien M. Amelot, Ya-Shian Li-Baboud, James Moyne
Clock synchronization is becoming an increasingly important characteristic of modern wide area monitoring and control systems such as the power grid. It provides an opportunity to coordinate control actions and measurement instants across hundreds of miles

US Anti-Counterfeiting Standards Development Activities: An Overview

December 1, 2010
Author(s)
Yaw S. Obeng, Eric D. Simmon, YaShian Li-Baboud
Counterfeit electronics components impact performance, hence can be viewed as a reliability concern. Several different strategies have been proposed to mitigate the penetration and impact of counterfeits on the supply chain. Standards afford effective

An IEEE 1588 Time Synchronization Testbed for Assessing Power Distribution Requirements

October 25, 2010
Author(s)
Julien M. Amelot, Clement Vasseur, Jeffrey Fletcher, Dhananjay Anand, Ya-Shian Li-Baboud, James Moyne
Wide-area monitoring applications for power distribution rely on accurate global time synchronization. Furthermore, there is interest in replacing current time synchronization methods such as IRIG, with distributed time synchronization protocols that