Using Lean Six Sigma to improve mobile order fulfilment process in a telecom service sector

This study proposes and follows a specific and systematic framework for implementing Lean Six Sigma (LSS) methodology in a telecom company in order to improve customer satisfaction by minimizing the company’s response time to customer requirements. The goal of this study was achieved by utilizing several LSS tools under five phases of the DMAIC methodology. Unlike previous studies in the telecom sector that used only qualitative method, in this study, both qualitative and quantitative methods were utilized to draw meaningful conclusions. As a result of the implementation of the LSS methodology, the average order fulfilment lead time for sales orders (SO) and value-added service (VAS) orders was reduced from 10.3 to 5.9 days and from 1.5 to 0.5 days, respectively. The reduction in lead time resulted in an increase in the sigma level for SO and VAS orders from 0.44 to 1.26 and from 0.73 to 2.66, respectively. These improvements were expected to lead to a financial benefit in savings of over $600,000 per year in operational costs, enhancements to customer experience and an increase in revenue generating opportunities. Moreover, this article enriches the existing literature on the application of LSS concept in the service industry, and helps the company to speed up the response to customer requirements.     

Youth studies,citizenship and transitions: towards a new research agenda

A key goal in youth studies is to gain holistic understandings of what it means to be young. However, a significant impediment to achieving this has been the tendency of youth studies to develop along siloed and stratified subfields. In keeping with the goal of creating more productive dialogue between subfields in youth studies, this paper examines the intersections between research in youth citizenship and youth transitions to consider the fresh insights and cross fertilisations that such an analysis may yield. This examination reveals a sense of dissatisfaction in both subfields with traditional normative and linear models of citizenship and transitions which rely on step-wise and sequential notions of time. In response, the paper advances a new research agenda which posits more temporally, spatially and relationally-sensitive understandings of youth citizenship and transition. Drawing on Ingold (2007. Lines: A brief history. London: Routledge), this agenda proposes the use of three alternative metaphors – genealogical, wayfaring and threads – which could hold the potential to unsettle the normativity and linearity of previous youth transitions and citizenship frameworks, and thus provide deeper insights into what it means to live and to be young citizens in times of transition.     

A comparison of test statistics for the recovery of rapid growth‐based enumeration tests

This paper considers five test statistics for comparing the recovery of a rapid growth‐based enumeration test with respect to the compendial microbiological method using a specific nonserial dilution experiment. The finite sample distributions of these test statistics are unknown, because they are functions of correlated count data. A simulation study is conducted to investigate the type I and type II error rates. For a balanced experimental design, the likelihood ratio test and the main effects analysis of variance (ANOVA) test for microbiological methods demonstrated nominal values for the type I error rate and provided the highest power compared with a test on weighted averages and two other ANOVA tests. The likelihood ratio test is preferred because it can also be used for unbalanced designs. It is demonstrated that an increase in power can only be achieved by an increase in the spiked number of organisms used in the experiment. The power is surprisingly not affected by the number of dilutions or the number of test samples. A real case study is provided to illustrate the theory. Copyright © 2013 John Wiley & Sons, Ltd.     

Cost-effectiveness analysis of the New South Wales adult drug court program

In New South Wales, Australia, a cost-effectiveness evaluation was conducted of an adult drug court (ADC) program as an alternative to jail for criminal offenders addicted to illicit drugs. This article describes the program, the cost-effectiveness analysis, and the results. The results of this study reveal that, for the 23-month period of the evaluation, the ADC was as cost-effective as were conventional sanctions in delaying the time to the first offense and more cost-effective in reducing the frequency of offending for those outcome measures selected. Although the evaluation was conducted using the traditional steps of a cost-effectiveness analysis, because of the complexity of the program and data limitations it was not always possible to adhere to textbook procedures. As such, each step involved in undertaking the cost-effectiveness analysis is discussed, highlighting the key issues faced in the evaluation.     

Peer‐Perceived Admiration and Social Preference: Contextual Correlates of Positive Peer Regard Among Suburban and Urban Adolescents

The primary purpose of this study was to understand further the heterogeneity of popularity, by exploring contextual correlates of two dimensions of positive peer regard among seventh graders within two highly disparate sociodemographic groups: affluent suburban and low‐income urban (N=636). Three sets of attributes were examined, all consistently linked to social status in past research: rebellious behaviors (aggression, academic disengagement, delinquency, and substance use), academic application (effort at school and good grades), and physical attributes (attractiveness and athletic ability). The data provide empirical validation for the conceptual distinctions among peer‐perceived admiration and social preference with adolescents from diverse contexts. More specifically, results showed that within each socioeconomic context (a) some forms of rebellious behaviors are clearly admired, (b) prosocial attributes are linked with peer‐perceived admiration and social preference, (c) physical attractiveness and athletic skills are important for positive peer regard, the former particularly for suburban girls and the latter for suburban boys, and (d) aggression elicits admiration among early adolescents, but can also generate their disdain (i.e., lowered social preference). In the urban context, results provided evidence for the salience of distinct forms of rebellious and achievement oriented behaviors among different racial/ethnic groups as well.     

The relative performances of improved ridge estimators and an empirical bayes estimator: some monte carlo results

The relative 'performances of improved ridge estimators and an empirical Bayes estimator are studied by means of Monte Carlo simulations. The empirical Bayes method is seen to perform consistently better in terms of smaller MSE and more accurate empirical coverage than any of the estimators considered here. A bootstrap method is proposed to obtain more reliable estimates of the MSE of ridge esimators. Some theorems on the bootstrap for the ridge estimators are also given and they are used to provide an analytical understanding of the proposed bootstrap procedure. Empirical coverages of the ridge estimators based on the proposed procedure are generally closer to the nominal coverage when compared to their earlier counterparts. In general, except for a few cases, these coverages are still less accurate than the empirical coverages of the empirical Bayes estimator.     

Equivalence testing for similarity in bioassays using bioequivalence criteria on the relative bioactivity

Similarity in bioassays means that the test preparation behaves as a dilution of the standard preparation with respect to their biological effect. Thus, similarity must be investigated to confirm this biological property. Historically, this was typically conducted with traditional hypothesis testing, but this has received substantial criticism. Failing to reject similarity does not imply that the 2 preparations are similar. Also, rejecting similarity when bioassay variability is small might simply demonstrate a nonrelevant deviation in similarity. To remedy these concerns, equivalence testing has been proposed as an alternative to traditional hypothesis testing, and it has found its way in the official guidelines. However, similarity has been discussed mainly in terms of the parameters in the dose‐response curves of the standard and test preparations, but the consequences of nonsimilarity on the relative bioactivity have never been investigated. This article provides a general equivalence approach to evaluate similarity that is directly related to bioequivalence on the relative bioactivity of the standard and test preparations. Bioequivalence on the relative bioactivity can only be guaranteed for positive (only nonblanks) and finite dose intervals. The approach is demonstrated on 4 case studies in which we also show how to calculate a sample size and how to investigate the power of equivalence on similarity.     

Negative Stereotyping of Older Nurses Despite Contact and Mere Exposure: The Case of Nursing Recruiters in Western Australia

Ageist attitudes have been identified across different industries. The nursing profession has a high proportion of older workers. As this facilitates regular contact with, as well as exposure to, older nurses, it may be expected to show less ageism. This study investigated 163 Western Australian nursing recruiters' attitudes toward older nurses. Results showed clear evidence of both negative and positive stereotyping of older nurses. Nursing recruiters indicated that they would be more than likely to hire older nurses and that age was less relevant in making hiring decisions. These findings suggest that enhancing the employability of older workers does not necessarily change ageist attitudes. This is relevant to policy formulation, attitude change interventions, and the well-being of older workers.     

Sex life after 65: How does erectile dysfunction affect ageing and elderly men?

Introduction. We report the findings pertinent to the ageing and elderly participants of a population-based study of erectile dysfunction (ED).

Method. We examined the sociodemographic characteristics, self-reported morbidities and responses to the 5-item International Index of Erectile Function (IIEF-5) of participants aged ≥65 years and ≥80 years.

Results. Most (73%) participants were married or had partners. Among the participants aged ≥65 years, the prevalence of ED (IIEF-5 scores <22) was 67% and of severe ED (IIEF-5 scores <8) 48%. About 32% were sexually active, and 11% had regular sexual intercourse. Cardiovascular disease (CVD) was reported in 37% and diabetes mellitus (DM) in 13%, with odds of ED at 3.91 and 4.68, respectively. Among those aged ≥80 years, the prevalence of ED was 68% and of severe ED 57%. About 12% were sexually active, and 3% had regular sexual intercourse. CVD was reported in 44% and DM in 11%, with corresponding odds of ED at 2.55 and 2.90.

Conclusions. Most ageing and elderly men are in a relationship and many are sexually active. ED is prevalent and severe. Morbidities are common and significantly associated with ED, impairing the sex lives of affected men.     

Patient-Centered Approach to Building Problem Solving Skills Among Older Primary Care Patients: Problems Identified and Resolved

This article describes problems identified by older primary care patients enrolled in Problem Solving Therapy (PST), and explores factors associated with successful problem resolution. PST patients received 1 to 8, 45-min sessions with a social worker. Patients identified problems in their lives and directed the focus of subsequent sessions as consistent with the steps of PST. The 107 patients identified 568 problems, 59% of which were resolved. Most commonly identified problems included health related issues such as need for exercise or weight loss activities, medical care and medical equipment needs, home and garden maintenance, and gathering information on their medical condition. Problems identified by patients were 2.2 times more likely to be solved than those identified by a health care professional. Using PST in primary care may facilitate patients in addressing key health and wellness issues.