Distributed manufacturing systems and the internet of things : a case study

In order to stay competitive in today's global market, manufacturing companies need to be flexible. To ensure flexible production, shorten processing times, and reduce time-tomarket, companies are utilizing the distributed manufacturing system paradigm, wherein geographically distributed, local resources are used for product development and production. In this context, the Internet of Things (IoT) has emerged as a concept which uses existing communication technologies, such as local wireless networks and the Internet to ensure visibility of anything from anywhere and at any time. In the paper, a case study of applying the IoT to the manufacturing domain is discussed. A distributed agent-based system for virtual monitoring and control of 3-axis CNC milling machine tools is designed and developed. The machines' 3D models and process states are shown through a web interface in real-time. The potential and challenges of implementing this system and the basic building blocks for decentralized value creation are discussed

Psychiatric disorders and general medical conditions: implications for the clinician

Patients with severe mental illness have higher than expected prevalence rates of co-morbid general medical conditions, particularly metabolic and cardiovascular disease. They are also at increased risk of contracting HIV. Conversely, these and other medical disorders also increase the risk of developing mental disorders. Mental illness and general medical conditions have mutually adverse effects on long-term outcome. This interaction of diseases contributes significantly to the excess morbidity in and higher than expected standard mortality ratios for patients with mental illness. As medical practice becomes more specialized and arguably compartmentalized it may increasingly fail to integrate health care for patients with severe mental illness. In this paper we discuss the high co-morbidity of mental illness with other medical disorders as well some of the potential mechanisms involved. We furthermore argue that the bidirectional relationship between mental and medical disorders should be considered in the planning of treatment for either group of disorders. The central role of the psychiatrist in co-ordinating and integrating the health care of patients with severe mental illness is emphasized.African Journal of Psychiatry Vol. 11 (1) 2008: pp. 18-2

A numerical analysis of machining induced residual stresses of Grade 5 Titanium Alloy

In general most manufacturing techniques alter the surface integrity of the final component. Surface integrity refers to the surface properties and their influence on the functional performance of manufactured components1. Machining induced residual stress is a surface integrity descriptor that may have a significant influence on the mechanical behavior of metallic parts subjected to dynamic loads2. Most manufacturing processes introduce some form of residual stress to the material. Cutting or more specifically machining involves large plastic deformation and elevated temperatures that may induce significant residual stresses in the surface and near surface region. When turning steel these stresses are largely tensile in nature and extend to a depth of approximately 200 μm1

'Juggling the glass balls ...': Workplace spirituality in women leaders

This qualitative study explored workplace spirituality in women leadership in higher education institutions (HEIs). Interviews were conducted with women leaders of the Higher Education Research Service network across eight institutions. Observations were made in one organisation. Findings show that women leaders are highly aware of their spirituality and religious affiliation which influence their work and work spirituality. Workplace spirituality includes how women leaders approach life and work, how spirituality expands their concept of religion and how the interwoven concepts of spirituality and religion help them to manage their work optimally. The study was limited to a relatively small sample size of 23 women leaders and was further bound to the qualitative research methodology. This study provides valuable insights into workplace spirituality regarding women leaders in South African HEIs. The findings provide a base for future research on women leaders in organisations and for leadership training of women within HEIs.

Health care discrimination against the mentally ill - A comparison of private health insurance benefits for major depressive disorder and ischaemic heart disease in South Africa

CITATION: Oosthuizen, P. et al. 2004. Health care discrimination against the mentally ill - A comparison of private health insurance benefits for major depressive disorder and ischaemic heart disease in South Africa. South African Medical Journal, 94(10):821-823.The original publication is available at http://www.samj.org.za[No abstract available]Publisher’s versio

Emissions testing of loose biomass in Limpopo province of South Africa

Abstract: Southern Africa depends on wood for energy. This affects deforestation and global warming. Loose biomass briquettes can replace round wood and mitigate such problems. Loose biomass derived from agricultural and forestry waste has chemicals like pesticides which can cause unsafe emissions. This paper studies emissions resulting from combustion of such loose biomass collected from Limpopo, a province of South Africa. Twelve loose biomass samples were tested for gases emitted from domestic stove combustion. Exhaust gases were sampled and tested to determine composition and quantities of emitted elements. Both element identification and particulate analysis are reported

An educational intervention to improve the quality of care of diabetic patients

Objective. As few studies have addressed intervention for in-hospital care of diabetes mellitus (DM) patients, we set out to investigate whether an educational intervention targeting doctors could improve the quality of care for diabetic patients.Design. An observational interventional study conducted at Pretoria Academic Hospital, a tertiary care hospital.Subjects. Doctors working in the Department of Internal Medicine were the subjects of two interventional sessions on diabetic care, and all diabetic patients admitted to the wards in the above Department were evaluated.Outcome measures. A Diabetes Attitude Scale (DAS-3) and a Diabetes Practice Scale (DPS) were completed by each doctor before and after the interventional educational sessions. Data from diabetic patients in the wards were collected for 5 weeks before and 5 weeks after the interventional training, and these two sets of data were compared to measure the effect of the interventional training.Results. Subscales of the DAS-3 showed an improvement, with a statistically significant improvement in attitude regarding seriousness of DM (P = 0.03), and a trend towards improvement in attitude regarding need for special training and patient autonomy. Most of the items on the DPS improved significantly (P < 0.05).Conclusions. A short educational intervention resulted in an improvement in attitude, knowledge and clinical management of diabetic patients

Health care discrimination against the mentally ill - A comparison of private health insurance benefits for major depressive disorder and ischaemic heart disease in South Africa

CITATION: Oosthuizen, P. et al. 2004. Health care discrimination against the mentally ill - A comparison of private health insurance benefits for major depressive disorder and ischaemic heart disease in South Africa. South African Medical Journal, 94(10):821-823.The original publication is available at http://www.samj.org.za[No abstract available]Publisher’s versio

Phylogeographic structure of Octopus vulgaris in South Africa revisited: identification of a second lineage near Durban harbor

In a previous study that investigated genetic structure of Octopus vulgaris along the South African coast by sequencing the mitochondrial cytochrome oxidase III gene (COIII), all sequences generated were identical. Such a finding is unusual, because mitochondrial DNA mutates quickly, and several marine invertebrates present in southern Africa show considerable genetic variation and structure. We reanalysed the samples using two different mitochondrial markers, namely cytochrome oxidase I (COI) and the large ribosomal subunit (16S rRNA). Sequences of both these markers showed variation. The conclusion of the previous study, that South Africa’s O. vulgaris population is characterised by a lack of genetic structure along the coast, is rejected. Some specimens from Durban (southeast Africa) were genetically more different from those found in the remainder of the country than were specimens from other regions (Tristan da Cunha and Senegal). We suggest that the lineage in Durban may have been recently introduced