Manufacturing bill-of-material planning

The bill-of-material BOM in the machine tool industry takes two different forms in design and manufacturing functions: Engineering BOM E BOM , which is used by the design engineer to represent designed product structure; and manufacturing BOM M BOM , which is used by MRPII system for MRP explosion. The designer constructs the E BOM after the product has been designed. Next, the E BOM is transformed into the M BOM by considering assembly sequence and constraints. Constructing a M BOM simply involves compressing the E BOM into a three-level M BOM. Planning of a M BOM still depends primarily on the experience input of a manufacturing engineer and is performed manually. This trial and error and time consuming approach creates an inconsistent method for planning the M BOM. Therefore, in this study, a three-stage M BOM planning method is developed. Stage one plans the initial M BOM, stage two improves the M BOM and stage three tunes the M BOM. Concepts and algorithms of each stage are highlighted in this study. Moreover, an illustration is presented to demonstrate the feasibility of M BOM planning.     

Derivation of a Target Level of Lead in Soil at Residential Sites Corresponding to a De Minimis Contribution to Blood Lead Concentration1

Inability to define either a clear toxicologic threshold or a stochastic all-or-nothing (cancer-type) response model for the noncarcinogenic effects of lead (Pb) in young children has posed difficulties for derivation of risk-based target levels of Pb in residential soil. Approaches based on empirical relationships between Pb levels in blood (PbB) and Pb in soil suffer from inability to specify the numerous variables which mediate between these two quantities. Approaches based on achieving a toxicologically de minimis target PbB level (e.g., 10 μg/dl) are subject to large uncertainty in estimating the distribution of existing PbB levels in a specific exposed population and in estimating the relative contribution from nonsoil sources of Pb. The multisource contribution to the distribution of PbB makes this approach unsuited for determination of a target Pb level in a single medium. An alternative approach is presented based on achieving a de minimis contribution to PbB (ΔPbB) from soil. Contributions to Pb exposure from outdoor soil and indoor soil-derived dust (ISDD) are modeled and appropriate values are suggested for input parameters. This analysis predicts that chronic exposure of young children to 200 μg Pb/g (ppm) in residential soil will result in a ΔPbB of 2 μg Pb/dl blood. This concentration of Pb in soil may provide an appropriate target level for residential soil when other significant sources of Pb exposure are present. In other cases, this approach can be used to predict a soil concentration of Pb corresponding to an appropriate non-de minimisΔPbB.     

Survey of Australian maternity hospitals to inform development and implementation of a stillbirth prevention ‘bundle of care’

Background‘Bundles of care’ are being implemented to improve key practice gaps in perinatal care. As part of our development of a stillbirth prevention bundle, we consulted with Australian maternity care providers.ObjectiveTo gain the insights of Australian maternity care providers to inform the development and implementation of a bundle of care for stillbirth prevention.MethodsA 2018 on-line survey of hospitals providing maternity services included 55 questions incorporating multiple choice, Likert items and open text. A senior clinician at each site completed the survey. The survey asked questions about practices related to fetal growth restriction, decreased fetal movements, smoking cessation, intrapartum fetal monitoring, maternal sleep position and perinatal mortality audit. The objectives were to assess which elements of care were most valued; best practice frequency; and, barriers and enablers to implementation.Results227 hospitals were invited with 83 (37%) responding. All proposed elements were perceived as important. Hospitals were least likely to follow best practice recommendations “all the time” for smoking cessation support (<50%), risk assessment for fetal growth restriction (<40%) and advice on sleep position (<20%). Time constraints, absence of clear guidelines and lack of continuity of carer were recognised as barriers to implementation across care practices.ConclusionsAreas for practice improvement were evident. All elements of care were valued, with increasing awareness of safe sleeping position perceived as less important. There is strong support from maternity care providers across Australia for a bundle of care to reduce stillbirth.     

Women’s experiences of their maternity care: A principle- based concept analysis

BackgroundDespite many countries employing the use of national and large scale regional surveys to explore women’s experiences of their maternity care, with the results informing national maternity policy and practice, the concept itself is ambiguous and ill-defined having not been subject of a structured concept development endeavour.AimThe aim of this review is to report on an in-depth analysis conducted on the concept of ‘women’s experiences of their maternity care’.MethodsUsing the principle-based method of concept analysis by Penrod and Hupcey (2005), the concept of ‘women’s experiences of their maternity care’ was analysed under the epistemological, pragmatic, linguistic and logical principles. The final dataset included 87 items of literature published between 1990 and 2017 retrieved from a systematic search of the MEDLINE, CINAHL, EMBASE and PSYCinfo databases.FindingsThe epistemological principle identified that a theoretical definition of the concept is elusive with a variety of implicit meanings. The pragmatic principle supports the utility of the concept in scientific literature, however the lack of a theoretical definition has led to inconsistent use of the concept, as highlighted by the linguistic principle. Furthermore, the logical principle highlighted that as the concept lacks definition blurring is identifiable when theoretically positioned with related concepts.ConclusionThe outcome of this concept analysis is a theoretical definition of a previously undefined concept. This definition highlights the subjective nature of the concept, its dependency upon a woman’s individual needs, expectations and circumstances and the influence of the organisation and delivery of maternity care.     

Dialogue and Challenge: Involving Service Users and Carers in Small Group Learning with Social Work and Nursing Students

This paper examines the rationale for service user and carer involvement in professional education and reflects on an initiative in which social work and nursing students undertook a sequence of joint learning in relation to mental health theory and practice. Central to this initiative was the promotion of opportunities for dialogue, both between students from different professional disciplines and between students, service users and carers. To enable this, much of the learning took place in small groups facilitated by either a service user or a carer.

Evaluation of this initiative indicated that, for the majority of social work and nursing students, learning from this shared experience had a major impact on their professional development. However, a small but significant minority found it hard to enter into a dialogue with others on a basis of equality and a sharing of their human as well as their professional experience. Some students indicated that they would have preferred a focus on acquiring more specialist professional knowledge and skills. This raises important issues in relation to the changing expectations of professionalism and professional education—and what really makes someone ‘fit for practice’.     

“I knew there has to be a better way”: Women’s pathways to freebirth in Poland

BackgroundEach year a small number of women decide to birth at home without midwifery and medical assistance despite the availability of maternity services in the country. This phenomenon is called freebirth and can be used as a lens to look into shortcomings of maternity care services.AimBy exploring women’s pathways to freebirth, this article aims to examine the larger context of maternity services in Poland and identify elements of care contributing to women’s decision to birth without midwifery and medical assistance.MethodsA qualitative methodology was used employing elements of ethnographic fieldwork, including digital ethnography. Semi-structured interviews with twelve women who freebirth, analysis of online support groups, secondary sources of information and elements of participant observation were used.FindingsWomen’s decisions to freebirth were born out of their previous negative experiences with maternity care. Persistent use of medical technology and lack of respect from maternity care providers played a major role in pushing women away from available Polish maternity services. While searching for a better environment for themselves and their babies for the subsequent births, women experienced a rigidity of both mainstream and homebirth services and patchy availability of the latter that contributed to their decisions to freebirth.ConclusionsFreebirth appears to be a consequence of inadequate maternity services both mainstream and homebirth rather than a preference. Women’s freebirth experiences can be used to improve maternity care in Poland and inform similar contexts globally.     

The relationality of maternity care: A diffractive analysis of maternity care experiences

ProblemPervasive polemics of differing approaches to and values of maternity care limit possibilities of nuanced and productive understandings of how maternity care is experienced.AimTo explore how maternity care identities (midwife, obstetrician, childbearing woman) are shaped by binarised conceptualisations of childbirth.MethodsThe diffractive analysis of data gathered in collective biography research groups.Findings and discussionMaternity care identities are not complete, pre-established entities, but rather are, ‘in the making’, remade in every maternity care encounter.ConclusionMaternity care identities are defined by their encounters with other maternity care identities, and therefore, each maternity care identity plays a role in which experiences of maternity care come into being.     

Maternity Care Plans: A retrospective review of a process aiming to support women who decline standard care

BackgroundAll competent adults have the right to refuse medical treatment. When pregnant women do so, ethical and medico-legal concerns arise and women may face difficulties accessing care. Policies guiding the provision of maternity care in these circumstances are rare and unstudied. One tertiary hospital in Australia has a process for clinicians to plan non-standard maternity care via a Maternity Care Plan (MCP).AimTo review processes and outcomes associated with MCPs from the first three and a half years of the policy's implementation.MethodsRetrospective cohort study comprising chart audit, review of demographic data and clinical outcomes, and content analysis of MCPs.FindingsMCPs (n = 52) were most commonly created when women declined recommended caesareans, preferring vaginal birth after two caesareans (VBAC2, n = 23; 44.2%) or vaginal breech birth (n = 7, 13.5%) or when women declined continuous intrapartum monitoring for vaginal birth after one caesarean (n = 8, 15.4%). Intrapartum care deviated from MCPs in 50% of cases, due to new or worsening clinical indications or changed maternal preferences. Clinical outcomes were reassuring. Most VBAC2 or VBAC>2 (69%) and vaginal breech births (96.3%) were attempted without MCPs, but women with MCPs appeared more likely to birth vaginally (VBAC2 success rate 66.7% with MCP, 17.5% without; vaginal breech birth success rate, 50% with MCP, 32.5% without).ConclusionsMCPs enabled clinicians to provide care outside of hospital policies but were utilised for a narrow range of situations, with significant variation in their application. Further research is needed to understand the experiences of women and clinicians.