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2 - Theoretical Foundations
- Grace Qiao Zhang, Curtin University, Perth, Ming-Yu Tseng
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- Book:
- Elasticity in Healthcare Communication
- Published online:
- 04 August 2022
- Print publication:
- 18 August 2022, pp 7-31
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- Chapter
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Summary
The four theoretical frameworks reviewed here are relevant to the conceptualisation of EL: pragmeme theory, integrative pragmatics, frame theory and elasticity theory. They are adopted as a guide through the research of EL in the present study. They all focus on pragmatic meanings grounded in context and complement each other for the benefit of this study. Pragmeme theory states that a pragmeme refers to a situation or an act that captures the goal of the situation, e.g., online healthcare information dissemination. This study expects that there should be regular patterns or protocols of EL use. The EL pragmeme can be realised in different situations, which can be manifested, according to the integrative pragmatics, through the pragmatic behaviours of online website writers and the evaluations of observers. The two focuses highlighted in integrative pragmatics are empirical evidence and the importance of observers’ participation (metapragmatics), both of which are adopted in this study. Frame theory guides the reader through the investigation of the participants’ perceptions of and attitudes towards the use of EL in this study.
Optimal plane beams modelling elastic linear objects
- Sung K. Koh, Guangjun Liu
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This paper discusses analytical and deterministic models for a plane curve with minimum deformation that may be utilized in planning the motion of elastic linear objects and investigating the inverse kinematics of a hyper-redundant robot. It usually requires intensive computation to determine the configuration of elastic linear objects. In addition, conventional optimization-based numerical techniques that identify the shape of elastic linear objects in equilibrium involve non-deterministic aspects. Several analytical models that produce the configuration of elastic linear objects in an efficient and deterministic manner are presented in this paper. To develop the analytical expressions for elastic linear objects, we consider a cantilever beam where the deflections are determined according to the Euler–Bernoulli beam theory. The deflections of the cantilever beam are determined for prescribed constraints imposed on the deflections at the free end to replicate various elastic linear objects. Deflections of a cantilever beam with roller supports are explored to replicate elastic linear objects in contact with rigid objects. We verify the analytical models by comparing them with exact beam deflections. The analytical model is precisely accurate for beams with small deflections as it is developed on the basis of the Euler–Bernoulli beam theory. Although it is applied to beams undergoing large deflections, it is still reasonably accurate and at least as precise as the conventional pseudo-rigid-body model. The computational demand involved in using the analytical models is negligible. Therefore, efficient motion planning for elastic linear objects can be realized when the proposed analytical models are combined with conventional motion planning algorithms. We also demonstrate that the analytical model solves the inverse kinematics problem in an efficient and robust manner through numerical simulations.