Browsing by Author "Cassidy, T."
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Item Metadata only Advances in CAD simulation of textile yarns(Research Journal of Textile and Apparel, 2011-02-02) Grishanov, S. A.; Siewe, Francois; Cassidy, T.A project aimed at the 3D simulation of textile yarns from technical specifications was begun in 1993 and attracted support from both industry and research councils to enable the formation of a multi-national team of researchers to come together in the UK. Considerable progress has been made particularly in the simulation of knitting yarn and plain knit fabric. In recent times the team has tackled the problem of simulating mixture coloured yarns sometimes called melange. This has necessitated a more complicated model of yarn structure based on queuing theory which is outlined at the end of the paper. References are provided for readers who wish to learn more of the various theories and models that have been used throughout the course of this project.Item Metadata only An application of queuing theory to modelling of melange yarns. Part I: A queuing model of melange yarn structure.(SAGE, 2009-11-01) Siewe, Francois; Grishanov, S. A.; Cassidy, T.; Banyard, GeoffreyA queuing model of staple fiber yarn is presented that enables the modeling and a better understanding of fiber migration in a yarn. The model provides a fine yarn structure where the migrational behavior of fibers is associated with the behavior of customers traveling across an open network of queuing systems to get services. Based on this analogy, the underlying mathematical foundation of the queuing theory is used for the modeling of yarn structure and properties. The model uses yarn technical specifications including yarn linear density and twist level, fiber linear density and length distribution, together with specific parameters such as fiber packing density distribution and migration probabilities. The model can be used for modeling a wide range of structurally different yarns; examples include marl, mottle and melange yarns, yarns with different levels of hairiness, and yarns produced by various spinning systems. The model can be used for 3D simulation of yarns in computer-aided design systems for textile design and for the prediction of mechanical properties of yarns.Item Metadata only An application of queuing theory to modelling of melange yarns. Part II: A method of estimating the fibre migration probabilities and a yarn structure simulation algorithm.(Sage, 2011-01) Grishanov, Sergei; Siewe, Francois; Cassidy, T.A queuing model of staple yarn structure was presented in Part I of this work, where the migration behaviours of fibres were simulated by the movement of customers in a Markovian network of queuing systems. Part II of the series proposes (i) a multi-dimensional minimization method for estimating the migration probabilities of fibres based on the analysis of the distribution of number of fibres in yarn cross-sections; (ii) a yarn structure simulation algorithm which uses the migration probabilities of fibres, yarn technical specifications (e.g. linear density and twist) and colour composition to produce a realistic three-dimensional image of a melange yarn. The result is a high quality three-dimensional image of a melange yarn showing its fibrous structure as well as the formation of hairiness. Due to the generic nature of the model and the simulation algorithm, this approach can be applied to a wide range of yarns including ring-spun or open-end spun yarns of solid shade or produced from melange blends. Further improvements to the proposed model are discussed including the application of inhomogeneous Poisson process and the analysis of energy relationships which govern the migration behaviour of fibres.Item Metadata only A comparison of various methods for establishing the relationship between structure and colour for fibre blends in yarn.(2006-10) Grishanov, S. A.; Banyard, Geoffrey; Cassidy, T.; Westland, S.Item Metadata only Computer-assisted yarn design.(Woodhead Publishing, 2008) Cassidy, T.; Grishanov, S. A.Item Open Access Family Structure and Psychologyical Health in Young Adults(Scientific Research, 2014-08) Cassidy, T.; Wright, Elizabeth Jane; Noon, E.This study explored the effect of the gendered structure of siblings in intact and non-intact families, on family relations, social support, perceived control, and psychological distress in a sample of 708 young adults (294 males and 414 females) aged between 18 - 21 years. Of the sample 96 were singletons, 208 had both a brother and sister, 206 had a brother and no sister, and 198 had a sister and no brother. While the results show that both the gender of the participants and the gender of the sibling seem to impact on distress and its mediators; the more important factor is the gender of siblings. In essence the presence of a female sibling is associated with more perceived support, control and optimism, and with lower pessimism and psychological distress. The presence of a female is also associated with better family relations overall and it is suggested that the main mechanism for this positive impact of female siblings is through the lowered conflict and increased expressiveness and cohesion experienced in female versus male dominated sibling groups.Item Metadata only The influence of woven stretch fabric properties on garment design and pattern construction.(2002-03) Shen, Jinsong; Tsai, I. D.; Cassidy, Carol; Cassidy, T.Item Metadata only Micro to macro: Digital data in design practice, research and education(2001) Brown, Stephen C.; Ashton, R.; Cassidy, T.; Fozzard, G.; Hardaker, C.; Higgett, N.Item Open Access Sibling constellations and wellbeing in intact and non-intact families(Journal of Adolescent Psychology and Psychiatry, 2015) Cassidy, T.; Noon, E.; Wright, Elizabeth JaneBackground: There is little research on the impact of sibling relations on the development of resilience in families experiencing break up. Methods: The role of sex of siblings in family structures was explored in relation to mental health in young adults in a sample of 927 participants (460 males and 467 females), aged 18-21 years old. In addition the potential mediating relationship of family relations, self-efficacy, optimism and social support were added to the mix in order to provide some ex-planatory mechanism for any relationship that might exist. Results: Multivariate analysis of variance and path analysis were used and findings suggest that the presence of a female sib-ling may be a protective factor and may operate through improving family relationships and increasing self-efficacy, optimism, and perceived social support. Conclusions: It is suggested that the sex structure of siblings should be considered in any family focused intervention to improve mental health.Item Metadata only Yarn CAD simulation for fashion and textile design education.(Taylor and Francis, 2008) Cassidy, T.; Grishanov, S. A.; Hsieh, W-H.