Download or read book Performance and Workload Effects for Full Versus Partial Automation in a High Fidelity Multi task System written by Stephen Francis Scallen and published by . This book was released on 1997 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Contemporary Ergonomics 2000 written by S. Robertson and published by CRC Press. This book was released on 2003-09-02 with total page 473 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 2000 edition of this long running and highly respected series, contains the best papers from the Ergonomics Society Annual Conference in 2000. The individual papers provide insight into current practice, presents new research findings, and forms an invaluable reference source. In addition to mainstream ergonomists and human factors specialists, Contemporary Ergonomics 2000 will appeal to all those who have an interest in peoples' interaction with their working and leisure environment - including designers, manufacturing and production engineers, health and safety specialists, occupational, applied and industrial psychologists and applied physiologists.
Download or read book Comparing Types of Adaptive Automation Within a Multi tasking Environment written by Grant S. Taylor and published by . This book was released on 2012 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: Throughout the many years of research examining the various effects of automation on operator performance, stress, workload, etc., the focus has traditionally been on the level of automation, and the invocation methods used to alter it. The goal of the current study is to instead examine the utilization of various types of automation with the goal of better meeting the operator's cognitive needs, thus improving their performance, workload, and stress. The task, control of a simulated unmanned robotic system, is designed to specifically stress the operator's visual perception capabilities to a greater degree. Two types of automation are implemented to support the operator's performance of the task: an auditory beep aid intended to support visual perception resources, and a driving aid automating control of the vehicle's navigation, offloading physical action execution resources. Therefore, a comparison can be made between types of automation intended to specifically support the mental dimension that is under the greatest demand (the auditory beep) against those that do not (the driving automation). An additional evaluation is made to determine the benefit of adaptively adjusting the level of each type of automation based on the current level of task demand, as well as the influence of individual differences in personality. Results indicate that the use of the auditory beep aid does improve performance, but also increases Temporal Demand and Effort. Use of driving automation appears to disengage the operator from the task, eliciting a vigilance response. Adaptively altering the level of automation to meet task demands has a mixed effect on performance and workload (reducing both) when the auditory beep automation is used. However, adaptive driving automation is clearly detrimental, causing an increase in workload while decreasing performance. Higher levels of Neuroticism are related to poorer threat detection performance, but personality differences show no indication of moderating the effects of either of the experimental manipulations. The results of this study show that the type of automation implemented within an environment has a considerable impact on the operator, in terms of performance as well as cognitive/emotional state.
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1997 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analyzing the Effects of Dynamic Task Allocation on Human automation System Performance written by Aaron William Johnson and published by . This book was released on 2015 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modem complex aerospace systems employ flight deck automation to increase the efficiency and safety of systems while reducing operator workload. However, too much automation can lead to overtrust, complacency, and a decrease in operator situation awareness. In an attempt to prevent these from occurring, the operator and the automation often share responsibility for performing tasks. The tasks allocated to each agent are rarely fixed; instead, they can be dynamically re-allocated throughout operations based on the state of the operators, system, and environment. This thesis investigates how dynamic task re-allocation has been implemented in operational aerospace systems, and investigates the effect of control mode transitions on operator flying performance, visual attention, mental workload, and situation awareness through experimentation and simulation. This thesis reviews the dynamic task allocation literature and discusses the ways in which the concept can be implemented. It highlights adaptive automation, in which the dynamic re-allocation of tasks is initiated by the automation in a manner that is adaptive - in response to the state of the operator, system, and environment - and workload-balancing - with the purpose of keeping the operator in control as much as possible while remaining at a moderate level of mental workload. Adaptive automation is enthusiastically supported in the literature; however, for reasons discussed, it has not been deployed in any operational civilian aerospace system. In the experiment, twelve subjects sat at a fixed-base lunar landing simulator and initiated transitions between automatic and two manual control modes. Visual fixations were recorded with an eye tracker, and subjects' mental workload and situation awareness were measured using the responses to a secondary two-choice response task and a tertiary task of verbal call-outs of the vehicle state, respectively. Subjects were found to re-allocate attention according to the priority of tasks: during mode transitions from autopilot to two-axis manual control the percent of total attention on the attitude indicator (which was required for the primary flying task) increased 14% while attention on instruments required for the secondary and tertiary tasks decreased 5%. Subjects' conception of task priority appeared to be influenced by instructions given during training and top-down and bottom-up properties of the tasks and instrument displays. The attention allocation was also affected by the frequency of control inputs required. The percent of attention on the attitude indicator decreased up to 13% across mode transitions where the flying task was not re-allocated because the pitch guidance rate-of-change decreased from -9 to 0 °/s throughout the trial. Consequently, fewer control inputs and less attention were necessary later in the trial. An integrated human-vehicle model was developed to simulate how operators allocate attention in the lunar landing task and the effect this has on flying performance, mental workload, and situation awareness. The human performance model describes how operators make estimates of the system states, correct these estimates by attending and perceiving information from the displays, and use these estimates to control the vehicle. A new attention parameter - the uncertainty in operators' estimates of system states between visual fixations - was developed that directly relates attention and situation awareness. The model's attention block was validated against experimental data, demonstrating an average difference in the percent of attention
Download or read book Multiple Task Performance written by D Damos and published by CRC Press. This book was released on 2020-07-24 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with theories of multiple-task performance and focuses on learning and performance. It is primarily for professionals in human factors, psychology, or engineering who are interested in multiple-task performance but have no formal training in the area.
Download or read book Effects of Automation Reliability and Failure Rate on Monitoring Performance in a Multi task Environment written by Patricia A. May and published by . This book was released on 1993 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Strategic Workload and the Cognitive Management of Advanced Multi task Systems written by Marilyn Jager Adams and published by . This book was released on 1991 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Improved technology and automation are being advocated as the solution to problems of lagging productivity and human error. However, the very technology that is sought to improve productivity and reduce human crewmember's workload often has the opposite effect. An alternative is human-centered automation that aids and supports the human crewmember. To design it requires an expanded view of workload as a strategic task management problem, contrasted with the more traditional view of workload as competition for a limited pool of processing resources at any one time. We introduce a theoretical framework for understanding human cognitive processing that builds on active theories of perception, connectionist theories of associative knowledge structures, and schema theories of comprehension. The framework addresses mechanisms of attention, situation awareness, and real-time management of multiple streams of activity.
Download or read book The Effects of Workload Transitions in a Multitasking Environment written by Margaret Anna Bowers and published by . This book was released on 2013 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: Previous research has found that performance is sometimes affected by transitions in workload. For some tasks and occupations, this type of change in demand can severely impact performance, which makes this a topic of interest for further research. The previous research conducted used a variety of tasks and methods, but few of the results obtained have been consistent. This study sought to determine the effect of workload transitions in a multi-tasking environment, which is an under-represented area in research on this topic. The use of subjective questionnaires to assess perceived workload and task-related stress has also been limited in previous research. Therefore, this study used the Air Force Multi-Attribute Task Battery (AF-MATB), which is a multi-tasking environment, the NASA Task Load Index, which is a measure of subjective workload, and the shortened Dundee Stress State Questionnaire, which a subjective measure of task-related stress. During testing, all participants completed AF-MATB trials that transitioned from an easy level to a difficult level or from a difficult level to an easy level. Also, they all completed easy and difficult control trials. Analyses of the performance data principally supported the success of the task difficulty manipulation, with significant differences only occurring between the easy and difficult portions of trials. However, the results of several AF-MATB subtasks indicated that the transition in task difficulty from difficult to easy had a negative impact on performance compared to performance in the easy control condition. The significant differences in two of these performance measures, however, may reflect trends in the data of the easy control condition as opposed to transition-related decrements in the difficult-easy condition, thereby making conclusions about the presence of transition effects in these instances somewhat difficult. The analysis of both the NASA Task Load Index and of the shortened Dundee State Questionnaire did not reveal any significant differences related to workload transition.
Download or read book The Role of Practice in Dual task Performance written by Walter Schneider and published by . This book was released on 1987 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: The literature on practice effects and transfer from the single- to dual-task performance and part-whole task learning are briefly reviewed. The results suggest that single-task training produces limited transfer to dual-task performance. Past theoretical frameworks for multi-task performance are reviewed. A connectionist/control architecture for skill acquisition is presented. The architecture involves neural-like units at the microlevel, with the information transmitted on vectors between modules at the macrolevel. The simulation of the model exhibits five phases of skill acquisition. Dual-task interference and performance are predicted as a function of the phase of practice training the skill has reached. Seven compensatory activities occur in the model during dual-task that do not appear in single-task training: 1) task shedding, delay and buffer preloading; 2) letting go of high-workload strategies; 3) utilizing noncompeting resources; 4) time multiplexing; 5) shortening transmissions; 6) converting interference from concurrent transmissions; and 7) chunking transmissions. Future research issues suggested by the architecture include: Mapping out the marginal utility of single- to multi-task transfer; investigating the classification of multi-task compensatory activities; evaluating the role of part-task trainers for multi-task skills; and developing and testing quantitative models of skill acquisition.
Download or read book Human Performance in a Multiple task Environment written by Ralph H. Cullen and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Multiple-task environments are pervasive in a variety of workplaces; many jobs require several concurrent, time-sensitive tasks be done in one task space. One concern in these multiple-task environments is attention allocation: To perform well, the operator must be able to know when and where to look. Otherwise, he or she will not be aware of the status of each task or be able to complete them. To aid these jobs, automation has been developed to support attention allocation: Auditory and visual alerts draw attention to where the system determines it is needed. However, imperfect automation may complicate the aid by introducing misses and false alarms to which the operator must also attend. : Researchers studying these environments and automation's purview within them have focused on a variety of different topics. Some examples include: different types of automation (alerts, decision aid systems, etc.), levels of reliability (0-100% reliable), what automation supports (attention allocation to situation awareness to performance), and how automation affects multiple task environments (two tasks to many).
Download or read book The Oxford Handbook of Cognitive Engineering written by John D. Lee and published by Oxford University Press. This book was released on 2013-03-07 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook is the first to provide comprehensive coverage of original state-of-the-science research, analysis, and design of integrated, human-technology systems.
Download or read book The Handbook of Operator Fatigue written by Dr Paula A Desmond and published by Ashgate Publishing, Ltd.. This book was released on 2012-10-01 with total page 1092 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue is a recognized problem in many facets of the human enterprise. It is not confined to any one area of activity but enters all situations in which humans have to perform for extended intervals of time. Most problematic are the circumstances in which obligatory action is continuous and the results of failure are evidently serious or even catastrophic. Therefore, the modern media especially highlights fatigue-related failures in industries such as transportation, materials processing and healthcare. It can be, and indeed is, no coincidence that most of the spectacular failures in process control that have resulted in the world's largest industrial accidents have occurred in the small hours of the morning when the circadian rhythm is lowest and operator fatigue itself peaks. While there have been legislative efforts made at state, federal and international levels to regulate working hours of employees, the appropriate implementation of such legislation is still a long way off. The Handbook of Operator Fatigue provides a comprehensive account of the subject to serve as the definitive reference work for researchers, students and practitioners alike. The volume features 30 chapters written by experts from around the world to address each important facet of fatigue, including: the scale of the fatigue problem (Section I), the nature of fatigue (Section II), how to assess fatigue (Section III), the impact of fatigue on health (Section IV), fatigue in the workplace (Section V), the neurological basis of fatigue (VI), sleep disorders (VII), and the design of countermeasures to fatigue (VIII).
Download or read book Modeling Human Attention and Performance in Automated Environments with Low Task Loading written by Fei Gao (Ph. D.) and published by . This book was released on 2016 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: Automation has the benefit of reducing human operators' workload. By leveraging the power of computers and information technology, the work of human operators is becoming easier. However, when the workload is too low but the human is required to be present either by regulation or due to limitations of automation, human performance can be negatively affected. Negative consequences such as distraction, mind wandering, and inattention have been reported across many high risk settings including unmanned aerial vehicle operation, process control plant supervision, train engineers, and anesthesiologists. Because of the move towards more automated systems in the future, a better understanding is needed to enable intervention and mitigation of possible negative impacts. The objectives of this research are to systematically investigate the attention and performance of human operators when they interact with automated systems under low task load, build a dynamic model and use it to facilitate system design. A systems-based framework, called the Boredom Influence Diagram, was proposed to better understand the relationships between the various influences and outcomes of low task loading. A System Dynamics model, named the Performance and Attention with Low-task-loading (PAL) Model, was built based on this framework. The PAL model captures the dynamic changes of task load, attention, and performance over time in long duration low task loading automated environments. In order to evaluate the replication and prediction capability of the model, three dynamic hypotheses were proposed and tested using data from three experiments. The first hypothesis stated that attention decreases under low task load. This was supported by comparing model outputs with data from an experiment of target searching using unmanned vehicles. Building on Hypothesis 1, the second and third hypotheses examined the impact of decreased attention on performance in responding to an emergency event. Hypothesis 2 was examined by comparing model outputs with data from an experiment of accident response in nuclear power plant monitoring. Results showed that performance is worse with lower attention levels. Hypothesis 3 was tested by comparing model outputs with data from an experiment of defensive target tracking. The results showed that the impact of decreased attention on performance was larger when the task was difficult. The process of testing these three hypotheses shows that the PAL model is a generalized theory that could explain behaviors under low task load in different supervisory control settings. Finally, benefits, limitations, generalizability and applications of the PAL model were evaluated. Further research is needed to improve and extend the PAL model, investigate individual differences to facilitate personnel selection, and develop system and task designs to mitigate negative consequences.
Download or read book Site Reliability Engineering written by Niall Richard Murphy and published by "O'Reilly Media, Inc.". This book was released on 2016-03-23 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt: The overwhelming majority of a software system’s lifespan is spent in use, not in design or implementation. So, why does conventional wisdom insist that software engineers focus primarily on the design and development of large-scale computing systems? In this collection of essays and articles, key members of Google’s Site Reliability Team explain how and why their commitment to the entire lifecycle has enabled the company to successfully build, deploy, monitor, and maintain some of the largest software systems in the world. You’ll learn the principles and practices that enable Google engineers to make systems more scalable, reliable, and efficient—lessons directly applicable to your organization. This book is divided into four sections: Introduction—Learn what site reliability engineering is and why it differs from conventional IT industry practices Principles—Examine the patterns, behaviors, and areas of concern that influence the work of a site reliability engineer (SRE) Practices—Understand the theory and practice of an SRE’s day-to-day work: building and operating large distributed computing systems Management—Explore Google's best practices for training, communication, and meetings that your organization can use
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Tactical Display for Soldiers written by National Research Council and published by National Academies Press. This book was released on 1997-01-17 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book examines the human factors issues associated with the development, testing, and implementation of helmet-mounted display technology in the 21st Century Land Warrior System. Because the framework of analysis is soldier performance with the system in the full range of environments and missions, the book discusses both the military context and the characteristics of the infantry soldiers who will use the system. The major issues covered include the positive and negative effects of such a display on the local and global situation awareness of the individual soldier, an analysis of the visual and psychomotor factors associated with each design feature, design considerations for auditory displays, and physical sources of stress and the implications of the display for affecting the soldier's workload. The book proposes an innovative approach to research and testing based on a three-stage strategy that begins in the laboratory, moves to controlled field studies, and culminates in operational testing.
