Works (35)

Updated: April 4th, 2024 15:14

2023 journal article

A comparison of the psychological effects of robot motion in physical and virtual environments

APPLIED ERGONOMICS, 112.

By: N. Sanders n, Z. Xie n & K. Chen n

author keywords: Human-robot interaction; Virtual reality; Workload
MeSH headings : Humans; Robotics / methods; User-Computer Interface; Task Performance and Analysis; Workload; Ergonomics
TL;DR: A mixed-methods approach was used to assess the fidelity of virtual environments as ergonomic assessment tools for human-robot interaction, and results suggest that people were distracted by the sound of the robot, and that presence was affected by manipulations of immersion and coherence. (via Semantic Scholar)
UN Sustainable Development Goal Categories
4. Quality Education (Web of Science)
Sources: Web Of Science, NC State University Libraries, ORCID
Added: July 19, 2023

2023 journal article

Eliciting Ergonomic User-Defined Gestures for Virtual Reality: A Pilot Study

Proceedings of the Human Factors and Ergonomics Society Annual Meeting.

By: N. Sanders n, E. Sener n & K. Chen n

TL;DR: Results showed that keeping the hands within the VWA had the potential to reduce Rapid Upper-Body Limb Assessment (RULA) and Borg CR10 scores at clinically significant levels, suggesting the design of virtual UIs can play a role in eliciting naturalistic yet ergonomic interactions. (via Semantic Scholar)
UN Sustainable Development Goal Categories
4. Quality Education (OpenAlex)
Source: ORCID
Added: February 2, 2024

2023 journal article

Experiences with Postdoctoral Training in Human Factors: Mentor and Trainee Perspectives

Proceedings of the Human Factors and Ergonomics Society Annual Meeting.

Source: ORCID
Added: February 2, 2024

2023 article

Modeling Human-Machine Interaction System Reliability with Multiple Dependent Degradation Processes and Situation Awareness

Hu, Y., Wang, R., Zhu, M., & Chen, K. B. B. (2023, July 19). INTERNATIONAL JOURNAL OF RELIABILITY QUALITY AND SAFETY ENGINEERING, Vol. 7.

By: Y. Hu n, R. Wang n, M. Zhu n & K. Chen n

author keywords: System reliability model; situation awareness; human-machine interaction
UN Sustainable Development Goal Categories
16. Peace, Justice and Strong Institutions (OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: August 7, 2023

2023 journal article

Scale Worlds: Iterative refinement, evaluation, and theory-usability balance of an immersive virtual learning environment

Proceedings of the Human Factors and Ergonomics Society Annual Meeting, 67(1), 2382–2388.

By: L. Wu n, B. Sekelsky n, M. Peterson n, T. Gampp n, C. Delgado n & K. Chen n

TL;DR: The overall assessment of SW paved a path for theory-usability balance and provided valuable insights for designing and evaluating usability in immersive virtual learning environments. (via Semantic Scholar)
Sources: ORCID, Crossref, NC State University Libraries
Added: February 2, 2024

2023 article

Shrink or grow the kids? Scale cognition in an immersive virtual environment for K-12 summer camp

2023 IEEE CONFERENCE ON VIRTUAL REALITY AND 3D USER INTERFACES ABSTRACTS AND WORKSHOPS, VRW, pp. 721–722.

By: L. Wu n, K. Chen n, B. Sekelsky n, M. Peterson n, T. Harper-Gampp n & C. Delgado n

author keywords: virtual reality; scale cognition; education application
TL;DR: Scale Worlds (SW), an immersive virtual environment to allow users to shrink or grow by powers of ten (10X) and experience entities from molecular to astronomical levels, and students' impressions and outcomes from experiencing SW in a CAVE during experiential summer outreach sessions are described. (via Semantic Scholar)
UN Sustainable Development Goal Categories
4. Quality Education (OpenAlex)
Sources: Web Of Science, NC State University Libraries, ORCID
Added: July 3, 2023

2023 journal article

Task-Oriented and Imitation-Oriented Movements in Virtual Reality Exercise Performance and Design

HUMAN FACTORS, 65(1), 125–136.

By: K. Chen n & K. Chen n

author keywords: virtual environment; practice and motivation; electromyography (EMG); motion tracking
MeSH headings : Humans; Exergaming; Imitative Behavior; Shoulder / physiology; Upper Extremity / physiology; Movement / physiology; Electromyography
TL;DR: Compared to imitation-oriented practice, task- oriented practice elicited more intensive shoulder movements and muscular efforts but also induced greater movement variations, which may help guide the design of future VREs. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID, NC State University Libraries
Added: May 17, 2021

2022 journal article

Checklists in Healthcare: Operational Improvement of Standards using Safety Engineering-Project CHOISSE-A framework for evaluating the effects of checklists on surgical team culture

APPLIED ERGONOMICS, 103.

By: G. Perera n, L. Hey*, K. Chen n, M. Morello n, B. McConnell n & J. Ivy n

Contributors: G. Perera n, L. Hey*, K. Chen n, M. Morello n, B. McConnell n & J. Ivy n

author keywords: Checklists; Teamwork; Surgical-safety
MeSH headings : Checklist / methods; Cohort Studies; Delivery of Health Care; Humans; Pilot Projects; Prospective Studies
TL;DR: The CHOISSE framework was applied to guide the implementation and evaluation of e-checklists on team culture for ten pilot teams across the US over a 24-week period and mixed methods analysis of the data and lessons learned were used to identify iterative improvements to the framework and to inform future studies. (via Semantic Scholar)
UN Sustainable Development Goal Categories
4. Quality Education (Web of Science)
Sources: ORCID, Web Of Science, NC State University Libraries
Added: May 25, 2022

2022 article

Examining the Effects of Gender Transfer in Virtual Reality on Implicit Gender Bias

Wu, L., & Chen, K. B. B. (2022, December 27). HUMAN FACTORS, Vol. 12.

By: L. Wu n & K. Chen n

author keywords: virtual reality; gender transfer; implicit gender bias
UN Sustainable Development Goal Categories
5. Gender Equality (OpenAlex)
Sources: ORCID, Web Of Science, NC State University Libraries
Added: December 28, 2022

2022 article

Unmet needs and problems related to employment and working as reported by survivors with metastatic breast cancer

Sesto, M. E., Carroll, C. B., Zhang, X., Chen, K. B., Terhaar, A., Wilson, A. S., & Tevaarwerk, A. J. (2022, January 28). SUPPORTIVE CARE IN CANCER, Vol. 30.

By: M. Sesto*, C. Carroll*, X. Zhang*, K. Chen n, A. Terhaar*, A. Wilson*, A. Tevaarwerk*

author keywords: Metastatic survivorship; Return to work; Breast cancer; Employment; Evaluation; Work capacity; Needs assessment
MeSH headings : Breast Neoplasms / therapy; Employment; Female; Humans; Middle Aged; Surveys and Questionnaires; Survivors; Workplace
TL;DR: The ongoing need of information targeting MBC to facilitate the management of employment and financial issues early in the MBC trajectory is highlighted. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID, NC State University Libraries
Added: February 7, 2022

2021 article

Reply to The Effects of Curative-Intent Cancer Therapy on Employment, Work Ability, and Work Limitations

Tevaarwerk, A. J., Kwekkeboom, K., Buhr, K. A., Dennee, A., Conkright, W., Onitilo, A., … Sesto, M. E. (2021, June 18). CANCER, Vol. 6.

By: A. Tevaarwerk*, K. Kwekkeboom*, K. Buhr*, A. Dennee*, W. Conkright*, A. Onitilo*, E. Robinson*, H. Ahuja* ...

MeSH headings : Employment; Humans; Lung Neoplasms / therapy; Work Capacity Evaluation
TL;DR: A deliberately crafted study designed to assess changes in work outcomes as patients received curative chemotherapy for diverse cancers in a US population in a prospective, longitudinal manner both during the course of curative treatment and afterward. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries
Added: June 28, 2021

2021 journal article

Results from a prospective longitudinal survey of employment and work outcomes in newly diagnosed cancer patients during and after curative-intent chemotherapy: A Wisconsin Oncology Network study

CANCER, 127(5), 801–808.

By: A. Tevaarwerk*, K. Kwekkeboom*, K. Buhr*, A. Dennee*, W. Conkright*, A. Onitilo*, E. Robinson*, H. Ahuja* ...

author keywords: cancer survivorship; cancer work limitations; return to work; working during cancer treatment
MeSH headings : Adult; Employment; Female; Humans; Longitudinal Studies; Male; Middle Aged; Neoplasms / drug therapy; Prospective Studies; Surveys and Questionnaires; Work Capacity Evaluation
TL;DR: Employment, work ability, and work limitations during and after treatment are prospectively examined. (via Semantic Scholar)
UN Sustainable Development Goal Categories
8. Decent Work and Economic Growth (OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: December 11, 2020

2021 article

Usage of a Web-Based Workplace and Symptom Self-Management Intervention Tool to Improve Work Ability for Breast Cancer Survivors

Chen, K. B., Yen, T., Sun, W., Tevaarwerk, A. J., Wiegmann, D. A., Heidrich, S. M., & Sesto, M. E. (2021, September 3). JOURNAL OF CANCER EDUCATION, Vol. 9.

By: K. Chen n, T. Yen*, W. Sun*, A. Tevaarwerk*, D. Wiegmann*, S. Heidrich*, M. Sesto*

author keywords: Breast cancer; Employment; Ergonomics; Web-based; Usage; Symptom management
MeSH headings : Female; Humans; Cancer Survivors; Breast Neoplasms / therapy; Workplace; Self-Management; Work Capacity Evaluation; Internet
TL;DR: Evaluating the usage of a web-based intervention developed to improve work ability for women recently diagnosed with breast cancer found that majority of breast cancer survivors, undergoing treatment with curative intent, accessed a website that provided personalized information on workplace and symptom strategies. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: ORCID, Web Of Science, NC State University Libraries
Added: September 13, 2021

2019 journal article

A usability assessment of riding lawn-mowing equipment with varying levels of design standards compliance

APPLIED ERGONOMICS, 78, 76–85.

By: Y. Deng n, J. Shirley, T. Rose n, L. Geary n, D. Feltner n, K. Chen n, J. Hoyle*, M. Dutt*, D. Kaber*

MeSH headings : Adult; Equipment Design / standards; Ergonomics / standards; Female; Gardening; Guideline Adherence; Heart Rate; Household Articles / standards; Humans; Male; Man-Machine Systems; Middle Aged; Poaceae; Safety; Time and Motion Studies; Workload; Young Adult
TL;DR: A usability and performance assessment of modern riding lawn-mowing tractor designs and features was conducted in a real-world test environment and revealed sensitivity of all response measures to design differences among the five RLE models, except the objective workload measures. (via Semantic Scholar)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: June 17, 2019

2019 journal article

Examining Relationship between Driver Characteristics and Critical Target Identification Failures

TRANSPORTATION RESEARCH RECORD, 2673(8), 192–197.

By: Y. Ho n, J. Lin* & K. Chen n

TL;DR: Examination of driver demographic, anthropometric, and functional characteristics that may influence the ability of drivers in identifying critical targets in the rear quarter blind spots while changing lane indicated that age and degree of functional rotation played a larger role in vehicle identification for this task. (via Semantic Scholar)
UN Sustainable Development Goal Categories
4. Quality Education (OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: October 14, 2019

2018 journal article

Immersion of virtual reality for rehabilitation - Review

Applied Ergonomics, 69, 153–161.

By: T. Rose n, C. Nam n & K. Chen n

author keywords: Haptic feedback; Rehabilitation; Virtual reality
MeSH headings : Computer Simulation; Feedback, Psychological; Humans; Task Performance and Analysis; Treatment Outcome; Virtual Reality Exposure Therapy / methods
TL;DR: Performance measures including postural stability, navigation task performance, and joint mobility showed varying relations to immersion and different haptic devices such as gloves and controllers provided both strengths and weakness in areas such movement velocity, movement accuracy, and path efficiency. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID, NC State University Libraries, Crossref
Added: August 6, 2018

2017 journal article

Use of Virtual Reality Feedback for Patients with Chronic Neck Pain and Kinesiophobia

IEEE TRANSACTIONS ON NEURAL SYSTEMS AND REHABILITATION ENGINEERING, 25(8), 1240–1248.

By: K. Chen n, M. Sesto*, K. Ponto*, J. Leonard*, A. Mason*, G. Vanderheiden*, J. Williams*, R. Radwin*

author keywords: Gain; just-noticeable difference; patient rehabilitation; range of motion; virtual reality
TL;DR: It is demonstrated that virtual reality may be useful for promoting the desired outcome of increased range of motion in neck rehabilitation exercises by altering visual feedback. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2017 journal article

Using the Microsoft Kinect (TM) to assess 3-D shoulder kinematics during computer use

APPLIED ERGONOMICS, 65, 418–423.

By: X. Xu n, M. Robertson*, K. Chen n, J. Lin* & R. McGorry*

author keywords: Office ergonomics; Motion tracking; Shoulder biomechanics; Workstation design
MeSH headings : Adult; Biomechanical Phenomena; Biosensing Techniques / instrumentation; Biosensing Techniques / methods; Computers; Ergonomics / instrumentation; Ergonomics / methods; Feasibility Studies; Female; Healthy Volunteers; Humans; Male; Range of Motion, Articular; Reproducibility of Results; Shoulder Joint / physiology; User-Computer Interface; Work / physiology
TL;DR: The results showed that the Kinect sensor had a better estimate on shoulder flexion/extension, compared with shoulder adduction/abduction and shoulder axial rotation, and can provide some insight on shoulder kinematics for improving office ergonomics. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2016 conference paper

Effect of a web-based, decision support intervention to improve work ability in breast cancer survivors

Meeting of the American Physical Therapy Association.

By: M. Sesto, K. Buhr, W. Sun, K. Chen, A. Tevaarwerk, D. Wiegmann, S. Heidrich

Source: NC State University Libraries
Added: August 6, 2018

2015 conference paper

Evaluation of older driver functional range of motion using virtual reality

International Annual Meeting of the Human Factors and Ergonomics Society.

By: K. Chen*, X. Xu*, J. Lin* & R. Radwin*

TL;DR: The results suggest that functional ROM, in addition to baseline ROM, should be considered when evaluating individual driving performance and the next step is to study if functional ROM measured using VR can be utilized for screening driving risks in aging. (via Semantic Scholar)
Sources: NC State University Libraries, NC State University Libraries
Added: August 6, 2018

2015 journal article

Evaluation of older driver head functional range of motion using portable immersive virtual reality

Experimental Gerontology, 70, 150–156.

By: K. Chen*, X. Xu*, J. Lin* & R. Radwin*

author keywords: Virtual reality; Older driver; Range of motion; Performance
MeSH headings : Adolescent; Adult; Aged; Aging / physiology; Automobile Driving / psychology; Cross-Sectional Studies; Female; Humans; Male; Neck / physiology; Psychomotor Performance; Range of Motion, Articular / physiology; Rotation; Task Performance and Analysis; User-Computer Interface; Young Adult
TL;DR: Assessing older driver functional ROM may provide more comprehensive assessment of driving ability than neck ROM and target detection success and time to detection may also be part of the aging process as these measures differed between driver groups. (via Semantic Scholar)
Sources: Crossref, Web Of Science, NC State University Libraries
Added: August 6, 2018

2015 journal article

Evaluation of older driver head functional range of motion using portable immersive virtual reality

Experimental Gerontology, 70, 150–156.

By: K. Chen, X. Xu & J. Lin

Source: NC State University Libraries
Added: August 6, 2018

2015 journal article

The accuracy of the Oculus Rift virtual reality head-mounted display during cervical spine mobility measurement

JOURNAL OF BIOMECHANICS, 48(4), 721–724.

By: X. Xu*, K. Chen*, J. Lin* & R. Radwin*

author keywords: Inertial sensors; Motion analysis; Neck range of motion
MeSH headings : Adult; Aged; Biomechanical Phenomena; Cervical Vertebrae / physiology; Female; Head Movements / physiology; Humans; Male; Middle Aged; Models, Biological; Movement / physiology; Neck / physiology; Range of Motion, Articular / physiology; Reproducibility of Results; Rotation; User-Computer Interface
TL;DR: Comparison of the kinematics data between the Rift and the tracking system indicated that the Rift can provide good estimates on full range of motion (from one side to the other side) during the performed task, but because of inertial sensor drifting, the unilateralrange of motion derived from the Rift is more erroneous. (via Semantic Scholar)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2015 conference paper

The living environments laboratory

IEEE VR.

By: E. Gill, P. Brennan, K. Ponto, R. Tredinnick, M. Broecker & K. Chen

Source: NC State University Libraries
Added: August 6, 2018

2015 journal article

Virtual Exertions: Evoking the Sense of Exerting Forces in Virtual Reality Using Gestures and Muscle Activity

HUMAN FACTORS, 57(4), 658–673.

author keywords: simulation and virtual reality; electromyography (EMG); forces and moments; computer interface; virtual environments
MeSH headings : Adult; Electromyography; Female; Gestures; Hand Strength / physiology; Humans; Lifting; Male; Muscle Fatigue / physiology; Muscle, Skeletal / physiology; Physical Exertion / physiology; Task Performance and Analysis; User-Computer Interface; Young Adult
TL;DR: Perceived exertion levels and muscle activity patterns corresponded to the assigned virtual loads, which supported the hypothesis that the method evoked the perception of physical exertions and showed the method was promising. (via Semantic Scholar)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2014 conference paper

Assessing exertions: How an increased level of immersion unwittingly leads to more natural behavior

IEEE VR.

TL;DR: This paper utilizes muscle exertions as a means to affect and study the behavior of participants in a virtual environment and found significant differences in the muscle activity between the two virtual presentation methods. (via Semantic Scholar)
Sources: NC State University Libraries, NC State University Libraries
Added: August 6, 2018

2014 conference paper

Influence of altered visual feedback on neck movement for a virtual reality rehabilitative system

International Annual Meeting of the Human Factors and Ergonomics Society.

TL;DR: This preliminary study shows that immersive VR with altered visual feedback influenced movement and the feasibility for rehabilitation of individuals with kinesiophobia will next be assessed. (via Semantic Scholar)
UN Sustainable Development Goal Categories
10. Reduced Inequalities (OpenAlex)
Sources: NC State University Libraries, NC State University Libraries
Added: August 6, 2018

2014 journal article

Manually Locating Physical and Virtual Reality Objects

HUMAN FACTORS, 56(6), 1163–1176.

By: K. Chen*, R. Kimmel*, A. Bartholomew*, K. Ponto*, M. Gleicher* & R. Radwin*

author keywords: virtual reality; physical interface; simulation; CAVE
MeSH headings : Adult; Computer Simulation; Female; Form Perception / physiology; Humans; Male; Physical Stimulation; Psychomotor Performance / physiology; Touch / physiology; User-Computer Interface; Vision, Binocular / physiology; Young Adult
TL;DR: Human physical interaction with objects in VR for simulation, training, and prototyping involving reaching and manually handling virtual objects in a CAVE are more accurate than predicted when locating farther objects. (via Semantic Scholar)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2013 journal article

Effect of Sitting or Standing on Touch Screen Performance and Touch Characteristics

HUMAN FACTORS, 55(4), 789–802.

By: A. Chourasia*, D. Wiegmann*, K. Chen*, C. Irwin* & M. Sesto*

author keywords: performance; workload; force; disability; touch screen
MeSH headings : Female; Humans; Male; Middle Aged; Posture / physiology; Psychomotor Disorders / physiopathology; Psychomotor Performance / physiology; Touch / physiology; User-Computer Interface
TL;DR: Standing affects performance at smaller button sizes, and for participants with and without motor-control disabilities, standing led to greater exerted force and impulse. (via Semantic Scholar)
UN Sustainable Development Goal Categories
4. Quality Education (OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2013 journal article

Effect of sitting orientation on touchscreen performance, touch characteristics, user preference, and workload

IIE Transactions on Occupational Ergonomics and Human Factors, 1(4), 235–245.

By: A. Chourasia*, C. A.*, B. K.* & M. Sesto*

TL;DR: The touchscreen performance findings from this study are applicable to touchscreen interface design for users with and without upper extremity motor control disabilities, and the touch characteristics findings are useful for ergonomists quantifying forces involved in touchscreen operation. (via Semantic Scholar)
Sources: NC State University Libraries, NC State University Libraries
Added: August 6, 2018

2013 journal article

Touch screen performance by individuals with and without motor control disabilities

APPLIED ERGONOMICS, 44(2), 297–302.

By: K. Chen*, A. Savage*, A. Chourasia*, D. Wiegmann* & M. Sesto*

author keywords: Touch screen; Performance; Disability
MeSH headings : Adult; Cerebral Palsy / physiopathology; Cerebral Palsy / psychology; Equipment Design / psychology; Essential Tremor / physiopathology; Essential Tremor / psychology; Female; Humans; Huntington Disease / physiopathology; Huntington Disease / psychology; Male; Middle Aged; Movement Disorders / physiopathology; Movement Disorders / psychology; Multiple Sclerosis / physiopathology; Multiple Sclerosis / psychology; Parkinson Disease / physiopathology; Parkinson Disease / psychology; Patient Preference; Task Performance and Analysis; Time Factors; Touch; User-Computer Interface
TL;DR: Investigation of the effects of button and gap size on performance by individuals with varied motor abilities indicated that as button size increased, there was a decrease in misses, errors, and time to complete tasks. (via Semantic Scholar)
UN Sustainable Development Goal Categories
4. Quality Education (OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2013 conference paper

Virtual exertions: Physical interactions in a virtual reality CAVE for simulating forceful tasks

International Annual Meeting of the Human Factors and Ergonomics Society.

By: C. Radwin R. G., P. K. B., . K. & R. Tredinnick

Source: NC State University Libraries
Added: August 6, 2018

2012 journal article

Development of a web-based survey tool to assess change in breast cancer (BrCa) survivor knowledge after receipt of cancer treatment summary and survivorship care plan (SCP)

Cancer Research (Chicago, Ill. Online), 72(24 Suppl.), 2–11.

By: J. Custer, G. Rocque, K. Wisinski, N. Jones, S. Donohue, T. Koehn, T. Champeny, A. Terhaar ...

Source: NC State University Libraries
Added: August 6, 2018

2012 conference paper

Effect of posture, button size and spacing on touch characteristics for disabled and non-disabled participants

International Conference on Applied Human Factors and Ergonomics.

By: A. Chourasia, K. Chen, D. Wiegmann & M. Sesto

Source: NC State University Libraries
Added: August 6, 2018

2012 journal article

Effect of touch screen button size and spacing on disabled and non-disabled user touch characteristics

Human Factors, 54(3), 425–436.

By: M. Sesto, C. Irwin, K. Chen & Wiegmann

Source: NC State University Libraries
Added: August 6, 2018

Employment

Updated: July 6th, 2023 16:38

2023 - present

North Carolina State University Raleigh, North Carolina, US
Associate Professor Industrial and Systems Engineering

2016 - 2023

NC State University Raleigh, NC, US
Assistant Professor Industrial and Systems Engineering

Education

Updated: October 25th, 2016 16:33

2012 - 2015

University of Wisconsin Madison Madison, WI, US
PhD

Citation Index includes data from a number of different sources. If you have questions about the sources of data in the Citation Index or need a set of data which is free to re-distribute, please contact us.

Certain data included herein are derived from the Web of Science© and InCites© (2024) of Clarivate Analytics. All rights reserved. You may not copy or re-distribute this material in whole or in part without the prior written consent of Clarivate Analytics.