An extension of the Freund's bivariate distribution to model cascading failures

The notion of cascading failures is a common phenomenon we observe around us. Here the initial failure alters the structure function of the system, which leads to subsequent failures within a short period of time referred to as threshold time. The concept of cascading failures within the framework of reliability theory and the Freund bivariate exponential distribution to model cascading failures has been studied by few authors. The Freund bivariate exponential distribution allows modelling a parallel redundant system with two components. In this system, the lifetimes of the two components behave as if they are independent, until one of the components fail, after which the remaining component suffers an increased/decreased stress. In this article, we further generalize this model to accommodate cascading failures. Various properties of the model are investigated and statistical inference procedures are developed using L-moments and method of moments. A practical application of this model is illustrated using data from www.espncricinfo.com. Also well analysed Diabetic Retinopathy Study (DRS) data is further analysed using this model and our findings are presented.     

Corporate social responsibility: the organizational view

Designing strategies for corporate social responsibility (CSR)-practice nowadays has become essential for organizations. Notwithstanding, how organizations appear internally in a socially responsible context toward their employees has been insufficiently investigated. This study aims at ascertaining how Internal CSR can be conceptualized as well as how it affects employees’ commitment. To do so, the manifestations of Internal CSR are discussed based on social identity theory and further literature, while the developed research model is checked for suitability through a survey generating 2081 employee responses from an international pharmaceutical company. As one result, it can be stated that the factors proposed to constitute Internal CSR are confirmed. Further, the findings entail the following conclusions: Internal CSR has a notable influence on employees’ Affective Organizational Commitment whilst relatively moderate impacting Normative Organizational Commitment. Additionally, Affective Organizational Commitment adopts a mediating function regarding Normative Organizational Commitment.     

Alternate Routing Strategies in Batch Manufacturing: An Evaluation

Batch manufacturing firms are experiencing significant changes because of technological developments in work center design, such as flexible manufacturing systems (FMS) and planning/control tools like computer-aided process planning (CAPP). These new developments provide production managers with some solutions to a number of complex problems. For example, numerical-controlled (NC) machine center installations are effective in providing quality parts because of tight tolerance specifications built into the equipment. However, these highly efficient centers create bottlenecks that constrain shop throughput, since production planners tend to rely too much on them. To help improve manufacturing planning, we introduce an important element to the batch production scheduling component of CAPP's mission—evaluating possible alternate routes. Production scheduling encompasses job route selection as well as machine center assignment (loading), job releasing, and setting due dates. In this paper, three routing strategies requiring different levels of shop floor information are tested and evaluated using computer simulation. Shop performance is measured by total cost and traditional measures of job flow time, lateness, and tardiness.     

Risk, Statistical Inference, and the Law of Evidence: The Use of Epidemiological Data in Toxic Tort Cases

Toxic torts are product liability cases dealing with alleged injuries due to chemical or biological hazards such as radiation, thalidomide, or Agent Orange. Toxic tort cases typically rely more heavily than other product liability cases on indirect or statistical proof of injury. There have been numerous theoretical analyses of statistical proof of injury in toxic tort cases. However, there have been only a handful of actual legal decisions regarding the use of such statistical evidence, and most of those decisions have been inconclusive. Recently, a major case from the Fifth Circuit, involving allegations that Benedectin (a morning sickness drug) caused birth defects, was decided entirely on the basis of statistical inference. This paper examines both the conceptual basis of that decision, and also the relationships among statistical inference, scientific evidence, and the rules of product liability in general.     

Racial intermarriage pairings

Most studies of racial intermarriage rely on the prevalence of intermarriage to measure the strength of group boundaries, without scrutinizing the nature of intermarriage pairings. Examination of intermarried couples' characteristics reveals (1) that intermarriages and endogamous marriages follow different patterns, and (2) that intermarriage pairings for some groups reflect a generalized racial status hierarchy. According to evidence from the 1990 U.S. Census PUMS, patterns in blacks' and Mexican Americans' marriages with whites suggest that a generalized racial status hierarchy disadvantages members of these minority groups. For marriages between Japanese Americans and whites, however, crossing the group boundary does not affect couples' characteristics.     

Stakeholders’ partnership approach to infrastructure provision and management in developing world cities: lessons from the Sustainable Ibadan project

In recent decades unprecedented urbanization has constituted a huge challenge to urban infrastructure development and management in most developing countries. Meanwhile, the appropriateness of conventional urban planning approaches to the improvement of urban environmental conditions in the face of deteriorating urban environment have often been questioned. It became inevitable to search for new approaches particularly in the context of low-income urban communities. International organizations such as the United Nations Development Programme (UNDP) and the United Nations Centre for Human Settlements (UNCHS) have subsequently initiated strategies to evolve a participatory approach to the development and management of the urban environment. One of such strategies is the Sustainable City Programme (SCP) which aims to provide municipal authorities and city stakeholders in the public, private and community sectors with an enhanced capacity for environmental planning and management. The programme is being implemented in several cities in parts of the developing world, including Ibadan – the Sustainable Ibadan Project (SIP) – in Nigeria. This paper examines the partnership approach to urban environmental infrastructure improvement, development and management as represented by the SIP. The relevance of the participatory partnership approach of the SIP for cities in parts of developing regions is examined. The paper implicitly stresses that bottom-up participatory stakeholder partnership is a strategy capable of enlisting the financial, material resources and expertise of various sectors of the urban community towards the improvement of urban environmental infrastructure. The paper presents preliminary findings of a study. Although traditional appraisal techniques were not employed, nonetheless, the paper presents a discussion of the processes and dynamics of the SIP on the basis of which some useful lessons may be drawn.