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ReferencesNavigation arrowAuthorsNavigation arrowRuthan Lewis

Publication statistics

Pub. period:1987-1989
Pub. count:4
Number of co-authors:3



Co-authors

Number of publications with 3 favourite co-authors:

Thomas J. Griffin:2
Mary E. Barnby:1
Ray A. Reaux:1

 

 

Productive colleagues

Ruthan Lewis's 3 most productive colleagues in number of publications:

Ray A. Reaux:4
Thomas J. Griffin:2
Mary E. Barnby:1
 
 
 
Jun 19

“ ... there are no simple 'right' answers for most web design questions (at least not for the important ones). What works is good, integrated design that fills a need--carefully thought out, well executed, and tested. ”

-- Steve Krug, Don't Make Me Think, p. 136

 
 

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Ruthan Lewis

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Publications by Ruthan Lewis (bibliography)

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1989
 
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Reaux, Ray A., Griffin, Thomas J. and Lewis, Ruthan (1989): Usability Testing and Requirements Derivation for EMU-Compatible Electrical Connectors. In: Proceedings of the Human Factors Society 33rd Annual Meeting 1989. pp. 144-148.

“On-orbit servicing of payloads is simplified when a spacecraft has been designed for serviceability. A key design criterion for a serviceable spacecraft is standardization of electrical connectors. The following research investigated the effects of extravehicular mobility unit (EMU) glove size, connector size, and connector type on usability of electrical connectors. An experiment was conducted exploring participants' ability to mate and demate connectors in an evacuated glovebox. Independent variables were two EMU glove-sizes, five connector size groups, and seven connector types. Significant differences in performance times and heart rate changes during mate and demate operations were found between EMU glove sizes, among connector types, and connector sizes. Subjective assessments of connectors were collected from participants with a usability questionnaire. The data were used to derive design recommendations for a National Aeronautics and Space Administration (NASA) recommended EMU-compatible electrical connector.”

© All rights reserved Reaux et al. and/or Human Factors Society

 
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Barnby, Mary E., Griffin, Thomas J. and Lewis, Ruthan (1989): Neutral Buoyancy Methodology for Studying Satellite Servicing EVA Crewmember Interfaces. In: Proceedings of the Human Factors Society 33rd Annual Meeting 1989. pp. 149-153.

“Current economic constraints indicate the need for incorporating the satellite servicing philosophy of commonality within the design of spacecraft subsystems. This philosophy is essential for conserving resources including hardware/software development and implementation costs, on-orbit ground-based manpower, crew training/testing time, and documentation. In addition, spacecraft subsystem commonality may be coupled with standardization of operational procedures, and test and verification technique for spacecraft design. Several spacecraft have adapted this practice, including Hubble Space Telescope, Space Station Freedom, and the Explorer Platform. As these and other programs continue and if effective crew interfaces and procedures are clearly and consistently defined, crew retraining for similar spacecraft subsystems will lessen, and procurement efforts will diminish. A relatively high fidelity zero-gravity simulation using water immersion is available to establish crew interfaces economically. The flexibility and utility of this space simulation medium for planning and assisting on-orbit operations was exemplified by astronaut evaluations of potential extravehicular activity electrical connectors. The testing was conducted at a National Aeronautics and Space Administration underwater neutral buoyancy training facility.”

© All rights reserved Barnby et al. and/or Human Factors Society

1987
 
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Lewis, Ruthan (1987): Crew-Induced Load Measurement for Space Operations. In: Proceedings of the Human Factors Society 31st Annual Meeting 1987. pp. 800-802.

“A method has been developed to simulate and measure crew-induced and reactive loads for a variety of intravehicular and extravehicular tasks. The need for this information has expanded in parallel with the complexity of space operations, i.e. satellite servicing, on-orbit construction, use of interactive workstations, etc. The method employs the use of a dynamometer attached to an adjustable support and a 3-axis force/torque platform. Translational and rotational hand/arm forces and torques, and foot reaction forces and torques may be measured simultaneously. The apparatus has been designed for on-orbit and ground-based usage. Beyond explanation of the instrumentation, the presentation will address data on forces effected by crewmembers, and applications, implication, and integration of the information with regards to planning space operations and design of crew-interfaced items.”

© All rights reserved Lewis and/or Human Factors Society

 
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Lewis, Ruthan (1987): A Method for Measuring the Effect of Grip Surface on Torque Production during Hand/Arm Rotation. In: Proceedings of the Human Factors Society 31st Annual Meeting 1987. pp. 898-900.

“Control of a manually handled object may be dependent on a variety of factors. Among these are frictional properties and geometry of the surfaces in contact with each other, position and alignment of the object and the operator, strength of the operator, etc. Control of the object is pertinent to properly direct the object or tool and to minimize the effort required of the operator during its use (i.e. by coordinating the mechanical advantage of the object and the operator). Evaluation of this feature may then help to improve the design and intent of the object or tool. The particular interface of interest in this presentation is the type of surface to be gripped and rotated by the space-gloved hand during a simulation of an on-orbit construction technique. An isokinetic method has been used to examine the effect of surface-type on performance measures including torque production, position of the peak torque, and angular distance rotated. The methodology supported a realistic viewing and simulation of the actual technique, yet also allowed controlled experimentation of the scenario with usable results characterizing each surface-type. The technique may be varied according to the application, and will be described.”

© All rights reserved Lewis and/or Human Factors Society

 
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Changes to this page (author)

26 Jun 2007: Modified
26 Jun 2007: Modified
25 Jun 2007: Modified
25 Jun 2007: Added

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Page maintainer: The Editorial Team
URL: http://www.interaction-design.org/references/authors/ruthan_lewis.html

Publication statistics

Pub. period:1987-1989
Pub. count:4
Number of co-authors:3



Co-authors

Number of publications with 3 favourite co-authors:

Thomas J. Griffin:2
Mary E. Barnby:1
Ray A. Reaux:1

 

 

Productive colleagues

Ruthan Lewis's 3 most productive colleagues in number of publications:

Ray A. Reaux:4
Thomas J. Griffin:2
Mary E. Barnby:1
 
 
 
Jun 19

“ ... there are no simple 'right' answers for most web design questions (at least not for the important ones). What works is good, integrated design that fills a need--carefully thought out, well executed, and tested. ”

-- Steve Krug, Don't Make Me Think, p. 136

 
 

Featured chapter

Read the fascinating history of Wearable Computing, told by its father, Steve Mann

Read Steve's chapter !

 
 

Latest books

The Social Design of Technical Systems: Building technologies for communities
by Brian Whitworth and Adnan Ahmad

 
Start reading

The Encyclopedia of Human-Computer Interaction, 2nd Ed.
by Mads Soegaard and Rikke Friis Dam

 
Start reading
 
 

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