Bottleneck identification and ranking model for mine operations

Abstract

Mining has a long history of production and operations management. Considering the increasing complexity of reserves, declining metal grades, and worldwide price volatilities, mines have to operate more efficiently than ever. In recent years, companies have been adopting innovative solutions and technologies to reduce costs and remain competitive in the global market. Specifically, management of bottlenecks has been in the focus of the manufacturing industry for decades now. The mining industry has made significant advancements in process improvement tools using equipment, human, and asset tracking capabilities. However, to date, there is no holistic approach or system to identify and manage the bottleneck in the entire value chain of mining. This research proposes a new method to identify and rank the bottlenecks in a mine value chain. The method is applied in a coal mine and the results are presented in the case study.     

BACKLASH, THE MATRIX OF DOMINATION, AND LOG CABIN REPUBLICANS

This article focuses on Log Cabin Republicans, gay members of that political party who reject "queer' politics and "leftist' projects among lesbian and gay activists. We show that members' social class, race, age, and gender are as central to an understanding of Log Cabin politics as is their nonnormative sexuality. The case of the Log Cabin Republicans illustrates how the matrix of domination is reaffirmed in backlash rhetoric and related so-ciopolitical practices. It also shows that the gay community comprises multiple, divergent subgroups that make the boundaries between lesbigay and straight politics more or less ambiguous and fluid. Put differently, the Log Cabin Republicans illuminate the practical limits of identity politics.
Early in the twentieth century, a gay white middle-class male observed:
Not till our whole commercial system, with its barter and sale of human labor and human love for gain, is done away, and not till a whole new code of ideals and customs of life has come in, will women really be free. They must remember that their cause is also the cause of the oppressed laborer over the whole earth, and the laborer has to remember that his cause is theirs. (Carpenter 1911, p. 60)     

The Role of Perceived Loneliness and Isolation in the Relapse from Recovery in Patients with Anorexia and Bulimia Nervosa

Rates of relapse in the treatment of anorexia nervosa and bulimia nervosa are problematic as is reflected in the literature. While there are some studies that examine the contributing factors associated with relapse, there is much that remains unclear. This paper explores the role of perceived isolation and loneliness as contributing factors in the relapse of patients in the course of treatment for these disorders. A review of the literature on relapse, clinical case material, treatment outcomes, and implications for future treatment and study are discussed.     

Managing AMI in a Just-In-Time Environment in the UK and Japan

In recent years many commentators have addressed the ‘crisis’ in manufacturing industry (Gerwin, 1982; Drucker, 1988, 1990; Hayes and Jaikumar, 1988). Some have offered cross-national comparisons on Japanese and Western management methods and techniques (Kharbanda and Stallworthy, 1991; Oliver and Wilkinson, 1987; Pascale and Athos, 1981) whilst others have concentrated on improving performance in specific fields such as management accounting (Kaplan, 1984; Cooper, 1991) or manufacturing management (Schonberger, 1982; Halt, 1983). Empirical research into managing AMT in Japan and the UK (Currie 1991a) considers some of the broader managerial issues in manufacturing. Cultural differences are common in the areas of investment appraisal, post-auditing of AMT and preventive maintenance policy. For example, in Japan JIT is perceived ‘holistically’ incorporating production management, total quality assurance (TQA) and total preventive maintenance (TPM). This is contrary to the UK in that many large manufacturing companies fail to include TPM in their manufacturing strategies (Currie and Seddon, 1991). There are few management information systems (MIS) which provide an understanding of machine performance using both non-financial and financial information. Focusing on maintenance as a central theme, the paper discusses the development of the Failure And Scheduled Maintenance Analysis (FASMA) system, which offers a practical solution to the problem of collecting and manipulating manufacturing data on the shopfloor (Seddon, 1991a). Essentially, FASMA attempts to interface both the manufacturing and management accounting functions by translating machine performance data into valuable information from which preventive maintenance policy may be improved. Using FASMA to measure machine performance at a major UK automotive manufacturer, machine down-time has averaged 61% each month over a 3-year period. By manipulating this data, performance measurement information may be utilized by management accountants. FASMA thus develops a link between manufacturing and management accounting by providing data on machine performance which can be used for cost analysis within a manufacturing environment. The paper concludes by arguing that manufacturing strategies can only be developed using appropriate management information systems (MIS) designed to enhance functional integration. This will enable a better understanding of how the ‘manufacturing jigsaw’ fits together.     

Small Voices: Children's Rights and Representation in Social Work Research

The persons who are social work's constituencies are typically disenfranchised and excluded. This is particularly the case with children whose voices are routinely suppressed. This paper outlines why Children's Article 12 Rights under the UN Convention on the Rights of the Child to express their views on all matters concerning them should also apply to social work research. The ethical issues around research with children are explored and a number of different research methods are outlined in order to offer a starting point for social workers wishing to place children's viewpoints and voices at the centre of their research.     

Nondrinker Mortality Risk in the United States

The literature has shown that people who do not drink alcohol are at greater risk for death than light to moderate drinkers, yet the reasons for this remain largely unexplained. We examine whether variation in people’s reasons for nondrinking explains the increased mortality. Our data come from the 1988–2006 National Health Interview Survey Linked Mortality File (N = 41,076 individuals age 21 and above, of whom 10,421 died over the follow-up period). The results indicate that nondrinkers include several different groups that have unique mortality risks. Among abstainers and light drinkers the risk of mortality is the same as light drinkers for a subgroup who report that they do not drink because of their family upbringing, and moral/religious reasons. In contrast, the risk of mortality is higher than light drinkers for former drinkers who cite health problems or who report problematic drinking behaviors. Our findings address a notable gap in the literature and may inform social policies to reduce or prevent alcohol abuse, increase health, and lengthen life.     

Stable growth in native‐dependent multistate population dynamics

Users of multistate life tables and projections have recognized that the Markovian assumptions underlying such models are unduly restrictive and should be relaxed whenever data permit. Efforts to include the influences of previous occupancies have included the incorporation of place‐of‐birth dependence. This paper addresses the stable growth properties of such generalized multistate models. It shows how place‐of‐birth‐specific stable growth measures can be calculated without projection simply by solving the characteristic equation. An example using Canadian data illustrates the argument.