| Diamond/Al Metal Matrix Composites Formed by the Pressureless Metal Infiltration Process |
93 |
|
| Authors:
William B. Johnson; B. Sonuparlak; LANXIDE CORP NEWARK DE
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 | Diamond particles are unique fillers for metal matrix composites because of their extremely high modulus, high thermal conductivity, and low coefficient of thermal expansion. diamond reinforced aluminum metal matrix composites were prepared using a pressureless metal infiltration process. the diamond particulates are coated with sic prior to infiltration to prevent the formation of al4c3, which is a product of the reaction between aluminum and diamond. the measured thermal conductivity of ... |
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| Human Factors Issues in Commercial Aircraft Maintenance and Inspection - Applications of Advanced Technologies |
93 |
|
| Authors:
William T. Shepard; William B. Johnson
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| New technology methods are under development in the training/job aiding area to provide support to maintainers. In particular, because of their size and portability, hand-held or pen-based computers have strong potential to provide work site tutorials on repair procedures as well as a host of other valuable information to technicians. This information could include parts lists, prior repair histories and regulatory requirements. These systems can also be used to support ... |
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| MITT Writer and MITT Writer Advanced Development: Developing Authoring and Training Systems for Complex Technical Domains |
MAY 92 |
46 pages |
| Authors:
Bradley J. Wiederholt; Jeffrey E. Norton; William B. Johnson; Elica J. Browning; GALAXY SCIENTIFIC CORP ATLANTA GA
|
 | MITT Writer is a software system for development of computer based training for complex technical domains. MITT Writer allows a student to learn and practice troubleshooting and diagnostic skills. The MITT (Microcomputer Intelligence for Technical Training) architecture is a reasonable approach to simulation-based diagnostic training. MITT delivers training on available computing equipment, delivers challenging training and simulation scenarios, and has economical development and maintenance costs. Animated flow, Graphics, Procedural advice, ... |
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| Reinforced Si3N4 Matrix Composites Formed by the Directed Metal Oxidation Process |
92 |
|
| Authors:
William B. Johnson; LANXIDE CORP NEWARK DE
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| Silicon nitride has many desirable characteristics for ceramic structural applications in heat engines. It has high room temperature strength, high retained strength at temperatures up to 1300 C, good thermal shock resistance, and excellent wear and corrosion resistance. Thus, it is particularly well suited for high temperature structural and/or wear applications in turbine engine and aerospace applications. Despite the promise of Si3N4, several technical challenges have hindered its widespread acceptance ... |
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| Microstructure of Platelet-Reinforced Ceramics Prepared by the Directed Reaction of Zirconium With Boron Carbide |
92 |
|
| Authors:
Else Breval; William B. Johnson; PENNSYLVANIA STATE UNIV UNIVERSITY PARK MATERIALS RESEARCH LAB
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| The microstructure of a ZrB2-platelet-reinforced ZrC(x) composite was examined using transmission electron microscopy and X-ray diffraction. The composites, which are formed by the reaction of molten Zr with B4C, contain a small amount of residual Zr, the amount of which can be varied by altering the processing conditions. Results on two different materials are reported, one with a low Zr content, 2.5 vol%, and the other with a very low ... |
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| Human Factors in Aviation Maintenance. Phase 1 |
NOV 1991 |
165 pages |
| Authors:
William T. Shepherd; William B. Johnson; Colin G. Druray; James C. Taylor; Daniel Berninger; GALAXY SCIENTIFIC CORP MAYS LANDING NJ
|
| This human factors research in aviation maintenance addresses four tasks including studies of organizational behaviour, job and task analysis in maintenance and inspection, advanced technology for training, and the application of job aiding to maintenance. The first phase of a three phase research program describes extensive preliminary investigation of airline maintenance practices. Each chapter describes the Phase I investigation and problem definition followed by the plan for the Phase II ... |
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| A Review of New Training Technology at the U.S. Army Signal School |
JUN 91 |
83 pages |
| Authors:
William B. Johnson; Michael G. Sanders; CAE-LINK CORP ALEXANDRIA VA ALLEN DIV
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| The Signal School and the U.S. Army Research Institute for the Behavioral and Social Sciences (ARI) Fort Gordon field Unit surveyed and assessed training technology both within and outside of the Signal School. Interviews with managers and instructional staff at the school were followed by training technology questionnaires completed by representatives of all of the school's training departments. The result showed that the majority of the Signal School's new training ... |
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| Kinetics of Formation of a Platelet-Reinforced Ceramic Composite Prepared by the Directed Reaction of Zirconium With Boron Carbide |
91 |
|
| Authors:
William B. Johnson; Alan S. Nagelberg; Else Breval; LANXIDE CORP NEWARK DE
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| The kinetics of formation of a new class of ceramic composite material, zirconium diboride platelet-reinforced zirconium carbides, are discussed. These materials are prepared by the directed reaction of molten zirconium with boron carbide to form a ceramic material composed of zirconium diboride platelets approximately uniformly distributed in a zirconium carbide matrix containing a controlled amount of residual zirconium metal. Results from interrupted growth studies, differential thermal analysis, adiabatic reaction temperature ... |
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| Computational Approaches for Analyzing Tradeoffs Between Training and Aiding |
MAY 90 |
64 pages |
| Authors:
William B. Rouse; William B. Johnson; SEARCH TECHNOLOGY INC NORCROSS GA
|
| This paper presents a methodological framework for representing tradeoffs among alternative combinations of training and aiding for personnel in complex systems. A wide variety of methods, tools, and models are reviewed. These approaches are evaluated in terms of their advantages and disadvantages when used to analyze training/aiding tradeoffs. These evaluations lead to the synthesis of three composite approaches to analyzing tradeoffs. The use of the proposed framework and its component ... |
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| Initial Evaluation of Principles for Graphical Displays in Maintenance Problem Solving |
11 DEC 89 |
25 pages |
| Authors:
Daniel R. Sewell; William B. Rouse; William B. Johnson; SEARCH TECHNOLOGY INC NORCROSS GA
|
| This paper reports the findings of two studies of the use of diagrams for maintenance problem solving. One study involved a protocol analysis of one maintainer working three maintenance problems. The protocol was analyzed for actions performed, strategies employed, diagrams used, and the relationships among all three. These findings were then used to develop a view of the cognition involved and the information required for maintenance problem solving. With this ... |
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| Development and Demonstration of Microcomputer Intelligence for Technical Training (MITT) |
AUG 88 |
43 pages |
| Authors:
William B. Johnson; Ruston M. Hunt; Phillip C. Duncan; Jeffrey E. Norton; SEARCH TECHNOLOGY INC NORCROSS GA
|
| The Microcomputer Intelligence for Technical Training research described here is founded upon a proven intelligent diagnostic training simulation to construct enhanced models of the student, instructor, and expert in a training environment. An off-the-shelf microcomputer was used to deliver an operational intelligent tutoring system (ITS) with 180 days of project start. The demonstration ITS was developed in cooperation with Air Force and NASA personnel at the Lyndon B. Johnson Space ... |
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| Development and Demonstration of a Laboratory Tool for Research in the Design of Games for Training of Troubleshooting Skills |
AUG 1982 |
43 pages |
| Authors:
William B. Johnson; William C. Entwistle; Karen S. Gaddis; ILLINOIS UNIV AT URBANA SAVOY AVIATION RESEARCH LAB
|
| In 1979 the University of Illinois developed a computer-based simulation designed to assist aviation maintenance trainees in acquiring troubleshooting skills. This simulation was named FAULT (Framework for Aiding in the Understanding of Logical Troubleshooting) and was originally designed for the DEC system 10 computer. The United States Army Research Institute for the Behavioral and Social Sciences subsequently contracted with the Aviation Research Laboratory (ARL) of the University of Illinois to ... |
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| An Annotated Selective Bibliography on Human Performance in Fault Diagnosis Tasks. |
JAN 1980 |
57 pages |
| Authors:
William B. Johnson; Sandra H. Rouse; William B. Rouse; ILLINOIS UNIV AT URBANA-CHAMPAIGN COORDINATED SCIENCE LAB
|
| This is an annotated bibliography of 61 published works about human performance in fault diagnosis. The sources are predominately from the disciplines of engineering, psychology, and education. Computer searches were conducted of the past 10 years of Psychological Abstracts and ERIC Documents. Manual searches using references from reports, University of Illinois library card catalog and solicitation of reference from experts in the extended the search to include references dating from ... |
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| Human Decision-Making in Computer Aided Fault Diagnosis. |
JAN 1980 |
35 pages |
| Authors:
William B. Rouse; Sandra H. Rouse; Ruston M. Hunt; William B. Johnson; Susan J. Pelligrino; ILLINOIS UNIV AT URBANA-CHAMPAIGN COORDINATED SCIENCE LAB
|
| This report summarizes a series of six experiments conducted to increase our understanding of human performance on diagnostic tasks, and in the process to investigate the feasibility of using context-free computer-based simulations to train troubleshooting skills. Three simulated diagnostic tasks were developed: a simple context-free task, a complex context-free task, and a context-specific task (simulation of aircraft powerplants). The six experiments evaluated the effects of computer aiding on performance of ... |
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| TROOP POSTURE SEQUENCES FOR DISMOUNTED ARMORED INFANTRYMEN. |
MAY 1968 |
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| Authors:
Robert T. Gschwind; Ward M. Nair; William B. Johnson; HUMAN ENGINEERING LABS ABERDEEN PROVING GROUND MD
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| This field experiment measured the posture sequence of armored infantrymen taking cover under and inside armored personnel carriers. Additionally, probability functions were developed for the exposed area of troops under the vehicles. (Author) |
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Reports by Author
