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Improving the feel of 3D printed prototypes for new product development: A feasibility study of emulating mass properties by optimising infill structures and materials
- Harry Felton, Jason Yon, Ben Hicks
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- Journal:
- Design Science / Volume 9 / 2023
- Published online by Cambridge University Press:
- 24 July 2023, e19
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Product prototypes and particularly those that are 3D printed will have mass properties that are significantly different from the product they represent. This affects both functional performance and stakeholder perception of the prototype. Within this work, computational emulation of mass properties for a primitive object (a cube) is considered, developing a baseline numerical method and parameter set with the aim of demonstrating the means of improving feel in 3D printed prototypes. The method is then applied and tuned for three case study products – a games controller, a hand drill and a laser pointer – demonstrating that product mass properties could be numerically emulated to within ~1% of the target values. This was achieved using typical material extrusion technology with no physical or process modification. It was observed that emulation accuracy is dependent on the relative offset of the centre of mass from the geometric centre. A sensitivity analysis is further undertaken to demonstrate that product-specific parameters can be beneficial. With tuning of these values, and with some neglect of practical limitations, emulation accuracy as high as ~99.8% can be achieved. This was shown to be a reduction in error of up to 99.6% relative to a conventional fabrication.
FROM HAPTIC INTERACTION TO DESIGN INSIGHT: AN EMPIRICAL COMPARISON OF COMMERCIAL HAND-TRACKING TECHNOLOGY
- Christopher Michael Jason Cox, Ben Hicks, James Gopsill, Chris Snider
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- Journal:
- Proceedings of the Design Society / Volume 3 / July 2023
- Published online by Cambridge University Press:
- 19 June 2023, pp. 1965-1974
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Advancements in prototyping technologies – haptics and extended reality – are creating exciting new environments to enhance stakeholder and user interaction with design concepts. These interactions can now occur earlier in the design process, transforming feedback mechanisms resulting in greater and faster iterations. This is essential for bringing right-first-time products to market as quickly as possible.
While existing feedback tools, such as speak-aloud, surveys and/or questionnaires, are a useful means for capturing user feedback and reflections on interactions, there is a desire to explicitly map user feedback to their physical prototype interaction. Over the past decade, several hand-tracking tools have been developed that can, in principle, capture product user interaction.
In this paper, we explore the capability of the LeapMotion Controller, MediaPipe and Manus Prime X Haptic gloves to capture user interaction with prototypes. A broad perspective of capability is adopted, including accuracy as well as the practical aspects of knowledge, skills, and ease of use. In this study, challenges in accuracy, occlusion and data processing were elicited in the capture and translation of user interaction into design insights.
A COMPARISON OF STRUCTURED LIGHT SCANNING AND PHOTOGRAMMETRY FOR THE DIGITISATION OF PHYSICAL PROTOTYPES
- Owen Freeman Gebler, Mark Goudswaard, Ben Hicks, David Jones, Aydin Nassehi, Chris Snider, Jason Yon
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- Journal:
- Proceedings of the Design Society / Volume 1 / August 2021
- Published online by Cambridge University Press:
- 27 July 2021, pp. 11-20
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Physical prototyping during early stage design typically represents an iterative process. Commonly, a single prototype will be used throughout the process, with its form being modified as the design evolves. If the form of the prototype is not captured as each iteration occurs understanding how specific design changes impact upon the satisfaction of requirements is challenging, particularly retrospectively.
In this paper two different systems for digitising physical artefacts, structured light scanning (SLS) and photogrammetry (PG), are investigated as means for capturing iterations of physical prototypes. First, a series of test artefacts are presented and procedures for operating each system are developed. Next, artefacts are digitised using both SLS and PG and resulting models are compared against a master model of each artefact. Results indicate that both systems are able to reconstruct the majority of each artefact's geometry within 0.1mm of the master, however, overall SLS demonstrated superior performance, both in terms of completion time and model quality. Additionally, the quality of PG models was far more influenced by the effort and expertise of the user compared to SLS.
‘We struggle and muddle.’ A qualitative study exploring community ABI therapists’ experiences of using, training in and implementing behaviour interventions
- Jai Jason Carmichael, Amelia J. Hicks, Kate Rachel Gould, Timothy J. Feeney, Penelope Analytis, Jennie Louise Ponsford
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- Journal:
- Brain Impairment / Volume 22 / Issue 1 / March 2021
- Published online by Cambridge University Press:
- 04 June 2020, pp. 34-49
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Objectives:
Individuals with acquired brain injury (ABI) may present with challenging behaviours (CB) that place themselves and others at risk of harm and impact their community integration. It is crucial for community ABI therapists to successfully train in and implement behaviour interventions. The current study aimed to investigate community ABI therapists’ experiences of using, training in and implementing behaviour interventions. An additional aim was to determine these therapists’ understanding of Positive Behaviour Support (PBS), one approach to addressing CB with a focus on improving quality of life.
Methods:Semi-structured interviews were conducted with 24 Australian community ABI therapists about their experiences of using, training in and implementing behaviour interventions and understanding of PBS. Inductive thematic analysis and content analysis were performed on interview transcripts.
Findings:The thematic analysis resulted in the generation of six themes which described the difficulties participants faced in training in and delivering behaviour interventions and identified their training and implementation needs. The content analysis resulted in 10 categories that characterised participants’ understanding of PBS, which centred around the absence of consequences, a focus on antecedents, person-centred practice and encouraging prosocial alternatives to CB.
Conclusions:The findings highlight a need and desire for more practical and interactive clinician training in behaviour interventions for individuals with ABI. Moreover, the findings suggest a limited understanding of PBS amongst community ABI therapists. Important considerations for the development of clinician training in ABI behaviour interventions and subsequent implementation into community practice are discussed.
Understanding Australian Community ABI Therapists’ Preferences for Training in and Implementing Behaviour Interventions: A Focus on Positive Behaviour Support
- Jai Jason Carmichael, Kate Rachel Gould, Amelia J. Hicks, Timothy J. Feeney, Jennie Louise Ponsford
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- Journal:
- Brain Impairment / Volume 21 / Issue 2 / September 2020
- Published online by Cambridge University Press:
- 21 October 2019, pp. 191-207
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Objective:
Individuals with acquired brain injury (ABI) may experience persistent and distressing challenging behaviours (CB), and therefore, effective delivery of behaviour interventions is crucial. This study aimed to investigate community ABI therapists’ experiences of using, training in and implementing behaviour interventions with a focus on Positive Behaviour Support (PBS).
Methods:A sample of Australian community ABI therapists (n = 136) completed an online survey about their experiences with behaviour interventions, including PBS. Data from open-ended questions were analysed using content analysis. Frequency and descriptive statistics were computed, and a multiple regression was performed to determine factors predicting readiness to learn and implement new behaviour interventions. Rank-based non-parametric tests were conducted to investigate the influence of clinical role on experiences with behaviour interventions and training preferences.
Results:Consistent with PBS, participants indicated that the following were important in addressing CB: teamwork and collaboration, person-centred practice, working with antecedents, environmental modification, improving quality of life and skill-building. Despite a high level of desire and readiness, 80% of participants reported facing barriers to learning and implementing new behaviour interventions (e.g., lack of time). Participants’ confidence in using behaviour interventions (β = 0.31; p = 0.002) and the number of barriers faced (β = −0.30; p = 0.002) predicted their readiness to learn and implement new behaviour interventions. Confidence, duration of past training in behaviour interventions and preferred duration of future training did not differ based on clinical role.
Conclusion:Implications for the development of training in behaviour interventions such as PBS and implementation into community practice are discussed.
CAEP 2016 Academic Symposium on Education Scholarship: Training our Future Clinician Educators in Emergency Medicine
- Robert A. Woods, Jennifer D. Artz, Benoit Carrière, Simon Field, James Huffman, Sandy L. Dong, Farhan Bhanji, Stella Yiu, Sheila Smith, Rose Mengual, Chris Hicks, Jason Frank
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- Journal:
- Canadian Journal of Emergency Medicine / Volume 19 / Issue S1 / May 2017
- Published online by Cambridge University Press:
- 15 May 2017, pp. S1-S8
- Print publication:
- May 2017
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Objective
To develop consensus recommendations for training future clinician educators (CEs) in emergency medicine (EM).
MethodsA panel of EM education leaders was assembled from across Canada and met regularly by teleconference over the course of 1 year. Recommendations for CE training were drafted based on the panel’s experience, a literature review, and a survey of current and past EM education leaders in Canada. Feedback was sought from attendees at the Canadian Association of Emergency Physicians (CAEP) annual academic symposium. Recommendations were distributed to the society’s Academic Section for further feedback and updated by a consensus of the expert panel.
ResultsRecommendations were categorized for one of three audiences: 1) Future CEs; 2) Academic departments and divisions (AD&D) that support training to fulfill their education leadership goals; and 3) The CAEP Academic Section. Advanced medical education training is recommended for any emergency physician or resident who pursues an education leadership role. Individuals should seek out mentorship in making decisions about career opportunities and training options. AD&D should regularly perform a needs assessment of their future CE needs and identify and encourage potential individuals who fulfill education leadership roles. AD&D should develop training opportunities at their institution, provide support to complete this training, and advocate for the recognition of education scholarship in their institutional promotions process. The CAEP Academic Section should support mentorship of future CEs on a national scale.
ConclusionThese recommendations serve as a framework for training and supporting the next generation of Canadian EM medical educators.
Faunal and Environmental Change in the Late Miocene Siwaliks of Northern Pakistan
- John C. Barry, Michèle E. Morgan, Lawrence J. Flynn, David Pilbeam, Anna K. Behrensmeyer, S. Mahmood Raza, Imran A. Khan, Catherine Badgley, Jason Hicks, Jay Kelley
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- Journal:
- Paleobiology / Volume 28 / Issue S2 / Spring 2002
- Published online by Cambridge University Press:
- 14 July 2015, pp. 1-71
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The Siwalik formations of northern Pakistan consist of deposits of ancient rivers that existed throughout the early Miocene through the late Pliocene. The formations are highly fossiliferous with a diverse array of terrestrial and freshwater vertebrates, which in combination with exceptional lateral exposure and good chronostratigraphic control allows a more detailed and temporally resolved study of the sediments and faunas than is typical in terrestrial deposits. Consequently the Siwaliks provide an opportunity to document temporal differences in species richness, turnover, and ecological structure in a terrestrial setting, and to investigate how such differences are related to changes in the fluvial system, vegetation, and climate. Here we focus on the interval between 10.7 and 5.7 Ma, a time of significant local tectonic and global climatic change. It is also the interval with the best temporal calibration of Siwalik faunas and most comprehensive data on species occurrences. A methodological focus of this paper is on controlling sampling biases that confound biological and ecological signals. Such biases include uneven sampling through time, differential preservation of larger animals and more durable skeletal elements, errors in age-dating imposed by uncertainties in correlation and paleomagnetic timescale calibrations, and uneven taxonomic treatment across groups. We attempt to control for them primarily by using a relative-abundance model to estimate limits for the first and last appearances from the occurrence data. This model also incorporates uncertainties in age estimates. Because of sampling limitations inherent in the terrestrial fossil record, our 100-Kyr temporal resolution may approach the finest possible level of resolution for studies of vertebrate faunal changes over periods of millions of years.
Approximately 40,000 specimens from surface and screenwash collections made at 555 localities form the basis of our study. Sixty percent of the localities have maximum and minimum age estimates differing by 100 Kyr or less, 82% by 200 Kyr or less. The fossils represent 115 mammalian species or lineages of ten orders: Insectivora, Scandentia, Primates, Tubulidentata, Proboscidea, Pholidota, Lagomorpha, Perissodactyla, Artiodactyla, and Rodentia. Important taxa omitted from this study include Carnivora, Elephantoidea, and Rhinocerotidae. Because different collecting methods were used for large and small species, they are treated separately in analyses. Small species include insectivores, tree shrews, rodents, lagomorphs, and small primates. They generally weigh less than 5 kg.
The sediments of the study interval were deposited by coexisting fluvial systems, with the larger emergent Nagri system being displaced between 10.1 and 9.0 Ma by an interfan Dhok Pathan system. In comparison to Nagri floodplains, Dhok Pathan floodplains were less well drained, with smaller rivers having more seasonally variable flow and more frequent avulsions. Paleosol sequences indicate reorganization of topography and drainage accompanying a transition to a more seasonal climate. A few paleosols may have formed under waterlogged, grassy woodlands, but most formed under drier conditions and more closed vegetation.
The oxygen isotopic record also indicates significant change in the patterns of precipitation beginning at 9.2 Ma, in what may have been a shift to a drier and more seasonal climate. The carbon isotope record demonstrates that after 8.1 Ma significant amounts of C4 grasses began to appear and that by 6.8 Ma floodplain habitats included extensive C4 grasslands. Plant communities with predominantly C3 plants were greatly diminished after 7.0 Ma, and those with predominantly C4 plants, which would have been open woodlands or grassy woodlands, appeared as early as 7.4 Ma.
Inferred first and last appearances show a constant, low level of faunal turnover throughout the interval 10.7–5.7-Ma, with three short periods of elevated turnover at 10.3, 7.8, and 7.3–7.0 Ma. The three pulses account for nearly 44% of all turnover. Throughout the late Miocene, species richness declined steadily, and diversity and richness indices together with data on body size imply that community ecological structure changed abruptly just after 10 Ma, and then again at 7.8 Ma. Between 10 and 7.8 Ma the large-mammal assemblages were strongly dominated by equids, with more balanced faunas before and after. The pattern of appearance and disappearance is selective with respect to inferred habits of the animals. Species appearing after 9.0 Ma are grazers or typical of more open habitats, whereas many species that disappear can be linked to more closed vegetation. We presume exceptions to this pattern were animals of the mixed C3/C4 communities or the wetter parts of the floodplain that did not persist into the latest Miocene. The pace of extinction accelerates once there is C4 vegetation on the floodplain.
The 10.3 Ma event primarily comprises disappearance of taxa that were both common and of long duration. The event does not correlate to any obvious local environmental or climatic event, and the pattern of species disappearance and appearance suggests that biotic interactions may have been more important than environmental change.
The 7.8 Ma event is characterized solely by appearances, and that at 7.3 Ma by a combination of appearances and disappearances. These two latest Miocene events include more taxa that were shorter ranging and less common, a difference of mode that developed between approximately 9.0 and 8.5 Ma when many short-ranging and rare species began to make appearances. Both events also show a close temporal correlation to changes in floodplain deposition and vegetation. The 7.8 Ma event follows the widespread appearance of C4 vegetation and is coincident with the shift from equid-dominated to more evenly balanced large-mammal assemblages. The 7.3 to 7.0 Ma event starts with the first occurrence of C4-dominated floras and ends with the last occurrence of C3-dominated vegetation. Absence of a consistent relationship between depositional facies and the composition of faunal assemblages leads us to reject fluvial system dynamics as a major cause of faunal change. The close correlation of latest Miocene species turnover and ecological change to expansion of C4 plants on the floodplain, in association with oxygen isotopic and sedimentological evidence for increasingly drier and more seasonal climates, causes us to favor explanations based on climatic change for both latest Miocene pulses.
The Siwalik record supports neither “coordinated stasis” nor “turnover pulse” evolutionary models. The brief, irregularly spaced pulses of high turnover are characteristic of both the stasis and pulse models, but the high level of background turnover that eliminates 65–70% of the initial species shows there is no stasis in the Siwalik record. In addition, the steadily declining species richness and abrupt, uncoordinated changes in diversity do not fit either model.