Automatic anthropometric personalization of a digital human model from a set of subject's photographs

The objective of the work is to develop a method for automatic dimensioning of a digital human model (DHM) from a set of calibrated photographs of the subject under study. Fifteen subjects (10 males, 5 females, mean age 27) wearing surface retro-reflective markers at major bony landmarks and standing inside a calibrated space, were photographed by means of low cost main stream digital cameras (face, left and right views). The DHM software used is based on a skeletal structure surrounded by contours defined by cross sections along the skeletal links. Specific points corresponding to bony landmarks are defined in body linkage local reference frames. The photograph calibration method (DLT) allows to superimpose a picture of the DHM on the subject's photographs. A specific algorithm adjusts the length of the manikin skeletal links in function of the measured distance between markers attached to these links (e.g. knee and ankle for the lower leg). Then the contour sections dimensions were adjusted to fit subject's silhouette extracted from the photographs. The results obtained within a few seconds of calculation consist of a personalized DHM representing the subject with an error less than 2% for stature and less than 4% for weight.     

Application of digital human modeling and simulation for vision analysis of pilots in a jet aircraft: a case study

Ergonomic evaluation of visual demands becomes crucial for the operators/users when rapid decision making is needed under extreme time constraint like navigation task of jet aircraft. Research reported here comprises ergonomic evaluation of pilot's vision in a jet aircraft in virtual environment to demonstrate how vision analysis tools of digital human modeling software can be used effectively for such study. Three (03) dynamic digital pilot models, representative of smallest, average and largest Indian pilot population were generated from anthropometric database and interfaced with digital prototype of the cockpit in Jack software for analysis of vision within and outside the cockpit. Vision analysis tools like view cones, eye view windows, blind spot area, obscuration zone, reflection zone etc. were employed during evaluation of visual fields. Vision analysis tool was also used for studying kinematic changes of pilot's body joints during simulated gazing activity. From present study, it can be concluded that vision analysis tool of digital human modeling software was found very effective in evaluation of position and alignment of different displays and controls in the workstation based upon their priorities within the visual fields and anthropometry of the targeted users, long before the development of its physical prototype.     

Comparison of ergonomic risk assessment outputs from Rapid Upper Limb Assessment and the Strain Index for tasks in automotive assembly plants

This paper compares the ergonomic risk assessment of a task for the upper extremities as determined by Rapid Upper Extremity Assessment (RULA) and the Strain Index (SI). The ergonomic risk to the upper extremities of 244 automotive assembly plant tasks were evaluated using RULA and SI. The outcomes of each tool were compared for each task. Results from this study provide practical insight into the methods used in each tool. This study compared only the ergonomic risk outputs from each tool; it does not pursue the question of which tool best predicts injury. The kappa score was 0.11, indicating little agreement between the outputs of the two tools. This is supported by the lack of monotonicity with a gamma score of 0.1. These results indicate that the risk assessment outcome of these two ergonomic assessment tools for the upper extremities do not agree.     

Interactive production planning and ergonomic assessment with Digital Human Models--introducing the Editor for Manual Work Activities (ema)

The aging workforce is a risk factor for manufacturing industries that contain many jobs with high physical workloads. Thus, ergonomic risk factors have to be avoided in early phases of production planning. This paper introduces a new tool for simulating manual work activities with 3D human models, the so-called emaΦ. For the most part, the emaΦ software is based on a unique modular approach including a number of complex operations that were theoretically developed and empirically validated by means of motion capturing technologies. Using these modules for defining the digital work process enables the production planner to compile human simulations more accurately and much quicker compared to any of the existing modeling tools. Features of the emaΦ software implementation, such as ergonomic evaluation and MTM-time analyses, and the workflow for practical application are presented.     

Features and limitations of digital human models--a new German guideline

In 2008 the Association of German Engineers (VDI) published the first part of the VDI 4499 guideline for methods and tools for the digital factory. Part 1 of this guideline deals with the fundamentals of the system and will be expanded by the addition of further parts on specific topics within the digital factory. Soon to be published is Part 4 which covers human models as tools of the digital factory. It describes the state of the art of current digital human models with regards to the methods and procedures implemented in German speaking countries. The structure of this part of the guideline is based on the different sections of engineering mechanics and outlines the opportunities for ergonomic assessments and the evaluation of work systems. During the writing of the guideline, the restrictions of the existing procedures also became evident thus showing the requirement for further development of such procedures. This is illustrated in this paper using examples from commercial software systems.     

Cognitively automated assembly processes: a simulation based evaluation of performance

The numerical control of an experimental assembly cell with two robots--termed a cognitive control unit (CCU)--is able to simulate human information processing at a rule-based level of cognitive control. To enable the CCU to work on a large range of assembly tasks expected of a human operator, the cognitive architecture SOAR is used. The CCU can plan assembly processes autonomously and react to ad-hoc changes in assembly sequences effectively. Extensive simulation studies have shown that cognitive automation based on SOAR is especially suitable for random parts supply, which reduces planning effort in logistics. Conversely, a disproportional increase in processing time was observed for deterministic parts supply, especially for assemblies containing large numbers of identical parts. In this contribution, the effect of phase-shifts in deterministic part supply is investigated for assemblies containing maximal different parts. It can be shown that the concept of cognitive automation is as well suitable for these planning problems.     

Digitally amplified practices: Beyond binaries and towards a profile of multiple digital coadjuvants

ABSTRACT

To examine the agentic conditions afforded through the use of digital tools in play-based settings, the Vygotskian (1997a, 1997b) concept of imitation was used to study the pedagogical practices of two teachers over two years (Group 1: 3–5.8 years, mean 4.5 years; Group 2: 4.7–6.7, mean 4.5). Rather than a static view of digital technology, where screen time acts as a proxy for understanding the child’s experience, this study found a complex profile of practices where digital tool use could not be separated from the existing preschool program. It is argued that these digitally amplified practices, named as coadjuvants, support children’s development.     

Assessors

The application of technology, such as interactive digital whiteboards, in the online environment of higher education, is growing at an accelerated pace. Much is known about the tools used in an on-ground course to promote student engagement, but the literature is scant on tools to promote student engagement in the online environment. The purpose of this study is to explore qualitative data from students on faculty efforts to promote student engagement through leveraged digital whiteboard technology. A qualitative review of feedback from graduate students (n = 81) qualitative responses from open-ended questions and follow up online focus group sessions (n = 9) indicate that this technology can be useful to promote a sense of social engagement among students. It is expected that this knowledge will help instructors to better understand what promotes student engagement in an online graduate social work cohort. This learning tool can be used to promote further engagement in future assignments.     

Globalisation and gender training for the media: challenges and lessons learned

This article discusses the experiences of the author in developing gender training for media professionals. The media has been known to be a key institutional player in holding governments and other institutions accountable for adhering to the democratic ideals of transparency, accountability, and good governance. Likewise, this article discusses the experience of Inter Press Service (IPS), a global information and communication service that aims to report more competently on gender issues. During the implementation of the IPS, several steps were taken: 1) examination of gender roles and responsibilities; 2) creation of gender-responsive editorial and employment policies towards better practices; 3) provision of training and seminars. In the same manner, there have been several challenges faced by media during gender training: the need to understand the basics, and the move from awareness-raising to provision of professional tools. To conclude, several lessons were learned during the course of its implementation: 1) the significance of policy as the initial step in mainstreaming; 2) training as the key to change; 3) the difficulty of practicing what has been learned; 4) monitoring; and 5) the importance of new partnerships.     

Assistive technology for disabled visual artists: exploring the impact of digital technologies on artistic practice

Abstract

Disabled artists with physical impairments can experience significant barriers in producing creative work. Digital technologies offer alternative opportunities to support artistic practice, but there has been a lack of research investigating the impact of assistive digital tools in this context. This article explores the current practice of physically impaired visual artists and their experiences around the use of digital technologies. An online survey was conducted with professional disabled artists and followed up by face-to-face interviews with 10 invited artists. The findings illustrate the issues disabled artists experience in their practice and highlight how they are commonly using mainstream digital technologies as part of their practice. However, there is little awareness around novel forms of technology (e.g. eye gaze tracking) that present new creative opportunities. The importance of digital tools for supporting wider practice (i.e. administrative and business tasks) was also highlighted as a key area where further work is required.     

A case study of smoke detector assembly work method intervention and evaluation

The study aimed to evaluate a work method intervention in a smoke detector assembly line. High hand gripping forces and extreme wrist postures were found in the smoke detector assembly line at UTC Fire & Security Company in Maine. A fixture was introduced to replace the old assembly method. Electromyography (EMG) and electrogoniometry were used to measure the workers' hand gripping force and wrist motions with both the old and new assembly methods. Results show both hand gripping forces and wrist postures improved significantly with the new method.     

ICONS, STRAW MEN AND PRECISION: Reflections on Demographic Theories of Fertility Decline

Despite the passage of half a century since 'demographic transition theory' first appeared in English-language demographic literature, many would agree that relatively little progress has been made toward refinement and testing of leading theoretical ideas, or towards theoretical consensus. There has rather been a proliferation of untested theories, partially overlapping and often associated with one individual, discipline, or school of thought. It is argued here that lack of clarity, precision and rigor in the statement, criticism, and use of theories of fertility decline is a major cause of the lack of theoretical progress. The greater use of tools for the computer modeling of complex dynamic systems is seen as a partial remedy. Emphasis is on the use of computer modeling (simulation) as a theoretical tool.     

Critically assessing digital documents: materiality and the interpretative role of software

As a contribution to the ongoing tradition of critically assessing documents for research, this paper aims to highlight materiality as a key factor in the co-shaping of knowledge derived from digital documents. The paper first builds upon prior debates in document studies with work from the fields of Science and Technology Studies, and Communication Studies, to establish the role of document materiality in the interpretative process. By first establishing digital documents’ material reality as electrical signal, the paper then discusses the interpretative role of software, in both the representation of that signal for human interpretation and the production of the document through software tools. Finally, the paper considers the implications for persistence and access to digital documents posed by their material reality and the private archival contexts in which they often reside.     

Biomechanical strain of goldsmiths

The work of the goldsmiths consists in the manufacture of jewelry. The piece, be it an earring, bracelet or necklace, is hand-assembled. This task requires precision, skill, kindness and patience. In this work, we make use of tools such as cuticle clippers and rounded tip, beads or precious stones and also pieces of metal. This type of activity requires a biomechanical stress of hands and wrists. In order to quantify the biomechanical stress, we performed a case study to measure the movements performed by an assembly of pieces of jewelry. As method for research, filming was done during assembly of parts to a paste, using a Nikon digital camera, for 1 (one) hour. The film was edited by Kinovea software, and the task was divided into cycles, each cycle corresponds to a complete object. In one cycle, there are four two movements of supination and pronation movements of the forearm. The cycle lasts approximately sixteen seconds, totaling 1800 cycles in eight hours. Despite the effort required of the wrists, the activity shows no complaints from the employees, but this fact does not mischaracterizes the ability of employees to acquire repetitive strain injuries and work-related musculoskeletal disorders.     

Thinking and Speech and Protocol Analysis

Some form of verbal report—that is, a research participant' s concurrent or retrospective verbal account of thought processes during problem-solving activities—has been used throughout this century as the database from which psychologists have developed theories of human mentation. Newell and Simon (1972) and Ericsson and Simon (1980, 1993) have provided extensive justification for using one such method, protocol analysis, as a tool for investigating cognition from an information-processing (IP) perspective. Their arguments have characterized protocol analysis as a methodology capable of providing evidence of the ways in which people attend to information stored in short-term memory to solve problems, with the evidence providing them with the grounds from which to generate models of human cognitive processes. A different view of protocol analysis is available from the perspective of cultural-historical activity theory (CHAT) based on the work of Vygotsky (1987), Leont'ev (1981), and others, and its concern with the mediation of human development by culturally and historically grounded signs and tools. Because of its emphasis on culturally channeled development, a CHAT perspective views speech, including the speech that serves as evidence for cognition in psychological research, as a tool that potentially enables changes in consciousness. In this article I outline a CHAT perspective that accounts for protocol analysis along three key dimensions: (a) the relation between thinking and speech from a representational standpoint, (b) the social role of speech in research methodology, and (c) the influence of speech on thinking during data collection. The purpose of this discussion is not to refute the IP perspective on protocol analysis but to illustrate how this method can be viewed through a CHAT lens and to identify alternative assumptions that must be made to use it from a CHAT perspective.     

Implementation of Intensive Permanence Services: A Trauma-Informed Approach to Preparing Foster Youth for Supportive Relationships

Youth in foster care who have histories of grief, loss, and placement disruptions need trauma-informed programs that can help them maintain stable and consistent connections with supportive adults. The purpose of this study was to explore the experiences of staff who implemented a trauma-informed model called Intensive Permanence Services (IPS). We conducted qualitative interviews with staff (N?=?7) who developed and implemented the IPS model and reviewed agency documents to identify the key characteristics of the model, the strategies staff used in their work with youth, and the challenges they faced to implementing IPS. Findings highlight these critical components: (1) using a youth-driven approach that prioritizes accountability to the youth and youth empowerment; (2) adopting an organizational culture of well-being using strategies such as secondary traumatic stress education, peer support, and structured supervision; and (3) promoting systems change for improved collaboration with all stakeholders, including the youth, families, caregivers, and other service providers. Overall, our findings stressed the importance of adopting a more holistic, trauma-informed, and youth-driven approach to improve permanence and well-being for youth in care.     

DHM and serious games: a case-study oil and gas laboratories

The aim in this paper is to present a research on the application of serious games for the design of laboratories in the oil and gas industries. The focus is in human virtual representation acquired from 3D scanning, human interaction, workspace layout and equipment designed considering ergonomics standards. The laboratory studies were simulated in Unity3D platform, which allows the users to control the DHM1 on the dynamic virtual scenario, in order to simulate work activities. This methodology can change the design process by improving the level of interaction between final users, managers and human factor teams. That helps to better visualize future work settings and improve the level of participation between all stakeholders.     

Evaluation of selected ergonomic assessment tools for use in providing job accommodation for people with inflammatory arthritis

Inflammatory arthritis (IA) is a leading cause of work disability, especially for those with jobs involving repetitive, hand-intensive or manual work. Ergonomic interventions may mediate against job loss. Our objective was to identify desirable features of an ergonomic tool for use in providing job accommodation for people with IA, and to evaluate a selection of ergonomic and rehabilitation tools against these features. Eight desirable features were compared across 16 assessment tools. None of the tools met all the pre-determined features. Ergonomic assessment tools should incorporate objective assessment of risk factors together with subjective perceptions of symptom aggravation, and identify risk factors that may not currently be causing problems, but may increase risk of aggravation or injury in the future. To accommodate the needs of people with IA, the tool should allow for evaluation of risks and generation of solutions without a worksite visit in situations where the client does not want to disclose their illness. Finally, an assessment tool needs to be applicable to a wide range of worksites, easy to use, valid, and reliable. Against these criteria, it appears that there is a lack of appropriate ergonomic assessment tools for use in people with IA.     

Human motion behavior while interacting with an industrial robot

Human workers and industrial robots both have specific strengths within industrial production. Advantageously they complement each other perfectly, which leads to the development of human-robot interaction (HRI) applications. Bringing humans and robots together in the same workspace may lead to potential collisions. The avoidance of such is a central safety requirement. It can be realized with sundry sensor systems, all of them decelerating the robot when the distance to the human decreases alarmingly and applying the emergency stop, when the distance becomes too small. As a consequence, the efficiency of the overall systems suffers, because the robot has high idle times. Optimized path planning algorithms have to be developed to avoid that. The following study investigates human motion behavior in the proximity of an industrial robot. Three different kinds of encounters between the two entities under three robot speed levels are prompted. A motion tracking system is used to capture the motions. Results show, that humans keep an average distance of about 0,5m to the robot, when the encounter occurs. Approximation of the workbenches is influenced by the robot in ten of 15 cases. Furthermore, an increase of participants' walking velocity with higher robot velocities is observed.     

Agent-based modeling as a tool for program design and evaluation

Recently, systems thinking and systems science approaches have gained popularity in the field of evaluation; however, there has been relatively little exploration of how evaluators could use quantitative tools to assist in the implementation of systems approaches therein. The purpose of this paper is to explore potential uses of one such quantitative tool, agent-based modeling, in evaluation practice. To this end, we define agent-based modeling and offer potential uses for it in typical evaluation activities, including: engaging stakeholders, selecting an intervention, modeling program theory, setting performance targets, and interpreting evaluation results. We provide demonstrative examples from published agent-based modeling efforts both inside and outside the field of evaluation for each of the evaluative activities discussed. We further describe potential pitfalls of this tool and offer cautions for evaluators who may chose to implement it in their practice. Finally, the article concludes with a discussion of the future of agent-based modeling in evaluation practice and a call for more formal exploration of this tool as well as other approaches to simulation modeling in the field.