Human factors and ergonomics | EPFL Graph Search

Human factors and ergonomics (commonly referred to as human factors engineering or HFE) is the application of psychological and physiological principles to the engineering and design of products, processes, and systems. Primary goals of human factors engineering are to reduce human error, increase productivity and system availability, and enhance safety, health and comfort with a specific focus on the interaction between the human and equipment. The field is a combination of numerous disciplines, such as psychology, sociology, engineering, biomechanics, industrial design, physiology, anthropometry, interaction design, visual design, user experience, and user interface design. Human factors research employs methods and approaches from these and other knowledge disciplines to study human behavior and generate data relevant to previously stated goals. In studying and sharing learning on the design of equipment, devices, and processes that fit the human body and its cognitive abilities

La modélisation des facteurs humains dans la gestion de projets

Roland Sauter

During the past years, project management has been rapidly spreading out into the various domains of human endeavor; project management is becoming the most promising form of management in a changing world. This development increased drastically the need for training programs for project managers, and the main challenge of those training programs is their behavioral aspect, the training of interpersonal skills. The aim of our work is to create a model of the human factors in project management, in order to build a training simulator which would integrate the technical expertise and the human factors. In order to establish a list of the relevant human factors in project management, we conducted a first survey among one hundred project managers. The findings of this first survey allowed us to work out a certain number of hypotheses, which were tested in a second survey on a larger sample of project managers (700). The construction of our model has been done with a precise goal: a training simulator – that's why we could simplify the problems in several ways, especially regarding the circular interactions of some variables in the model. The data gathered in the survey were used to determine the parameters of the model. The construction of such a model is the first specificity of our work. Then we developed a full-scale training simulator for project managers, and we implemented our model of the human factors in this simulator. The simulator is centered on the planing and execution phases of a project. A simple, easy-to-use interface allows the user to visualize the project status, to make adequate decisions and to see the effect of those decisions on the project and on the evolution of the human factors immediately. The integration of the technical tasks and the human factors into a simulator is the second specificity of our work. This simulator has been in use since the beginning of 1995, and 200 project managers have been trained since then. A survey was conducted among the trainees: it showed the high efficiency of this type of training in a virtual world, the very high motivation of the trainees and a high learning effect on the behavioral level.

EPFL1996

Mise en oeuvre d’une gestion du risque en entreprise 2.0

Cosette Schuler

The Management is a key element in organizations and is a major component in their success. The aim of this thesis is to study the implementation of an enterprise management by putting forward the human factor. The ISO31000 ”Risk Management” standard and the COSO II ”Enterprise Risk Management Framework” were analyzed and mapped. It was found that their structure is similar and the majority of aspects are included in both frameworks. Ten semi-structured interviews were conducted with people working in the field of risk management. The interviews focused on the human factor in the risk management standards in order to identify potential gaps in the frameworks. The interviews were synthesized, analyzed and three hypotheses were put forward. With the ISO31000 and COSO mappings as well as the analysis of the interviews, it was highlighted that the definition of the human factor was not included and the notions of team management were not developed. These elements are aspects that influence risk management. Based on the hypotheses and findings of the analysis of the ISO31000 and COSO standards, a management recommendation was developed. This management recommendation defines the human factor, gives tools for an e↵ective team management and also puts forward the method of Control Self-Assessment (CSA), a method involving the employees in the evaluation of the process of risk management and control.

2022

Haptic interface design and control with application to surgery simulation

Ulrich Spälter

This thesis proposes a framework for haptic devices interacting with virtual environments. As application of the theoretical results a haptic device for the surgical training of hysteroscopy, a gynecologic intervention, is presented. Surgery simulators, which can be described as 'flight simulators for surgeons', comprise a virtual reality for modeling and visualization of organs, and the haptic device: While the surgeon interactively follows the scene on the computer screen, he perceives the contact forces at the tool handle of the surgical instrument. The haptic device tracks the position of the surgery tool and transforms the virtual contact forces to real forces, which can be actually felt by the surgeon. This thesis treats haptic devices with application to surgery simulators for minimally-invasive surgery. Haptic interfaces are complex mechatronic systems and show inherent trade-offs between haptic realism and system stability. Human factors play an important role, as the human operator can both stabilize or destabilize the system. The haptic perception, which can vary between individuals, as a criterion for haptic rendering quality is still not formalized. The optimization of haptic interfaces, within focus of research since 15 years ago, has remained a complex task. However, with look at the emerging applications for haptics, it has become an even more important topic. For this reason it is necessary to integrate mechanical design, control design, mechatronic elements and human factors in a unifying approach. This thesis highlights the principal trade-offs of haptic interfaces and works out design guidelines for new developments and quantitative information on where and how to optimize haptic systems. As application example a haptic interface for the simulation of hysteroscopy, a gynecologic intervention on the female uterus, has been realized as prototype. The device takes the characteristics of hysteroscopy into account and introduces features like insertion and complete removal of the surgery tool from the haptic interface. A design methodology is proposed, which combines aspects of theoretical kinematics based on Lie-Groups with integrated product development – a systematic approach for engineering tasks. The result, a novel kinematic design, has been realized as haptic interface prototype. The well-known affine parameterization for all stabilizing controllers is shown to be a well-suited tool for haptic control synthesis. It provides insights into the control trade-offs and allows to integrate human factors at controller design stage. The resulting controller, demonstrated by experimental results, can reduce parasitic effects (friction, device dynamics) close to and below the human perception threshhold, thus making the device transparent within the specified bandwidth and suitable for real-time implementation. For numerical controller representation the δ-operator is discussed. It unifies continuous and discrete time domain and has beneficial numerical properties. As there is still no standardized procedure for technical performance evaluation of haptic interfaces methods proposed in literature are summarized. In the near future a large market for haptic technology can be expected with applications from surgery-assist devices and drive-by-wire interfaces in automobiles to entertainment, which highlights the relevance of the treated topic.

EPFL2006