The extended GWMA control chart

This study extends the generally weighted moving average (GWMA) control chart by imitating the double exponentially weighted moving average (DEWMA) technique. The proposed chart is called the double generally weighted moving average (DGWMA) control chart. Simulation is employed to evaluate the average run length characteristics of the GWMA, DEWMA and DGWMA control charts. An extensive comparison of these control charts reveals that the DGWMA control chart with time-varying control limits is more sensitive than the GWMA and the DEWMA control charts for detecting medium shifts in the mean of a process when the shifts are between 0.5 and 1.5 standard deviations. Additionally, the GWMA control chart performs better when the mean shifts are below the 0.5 standard deviation, and the DEWMA control performs better when the mean shifts are above the 1.5 standard deviation. The design of the DGWMA control chart is also discussed.     

加强我国艾滋病防治督导与评估能力建设的思考

随着艾滋病防治督导与评估重要性的凸显,我国也积极努力地尝试建立国家综合协调的艾滋病防治督导与评估体系。能力建设是督导与评估工作的基础和前提,本文围绕督导与评估能力建设的概念和目标,提出加强能力建设的建议和方向。     

Age limits for participation in child protection court proceedings in Sweden

According to the UN Convention on the Rights of the Child and Swedish legislation, children have the right to participate in child protection proceedings. The aim of this paper is to describe and analyse the notion of age and maturity in child protection proceedings in order to elucidate how these aspects could influence children's rights to participate. We focus on the view of three groups of actors involved in child protection proceedings in Sweden—social workers, lawyers, and laypersons in social welfare boards and administrative courts—and on how children's age and maturity should be taken into consideration in decisions on their participation in court. The analysis is based on survey data. The study found that social workers, laypersons, and lawyers have different views on when children are old enough to have the right to litigate in court. Additionally, there is no consensus on how the maturity of the child can be assessed to inform the decision about participation. More discussion is needed about what competences a child needs to participate in court and to what extent this right should be limited by their age. Importantly, courts and decision‐making proceedings can be made more child friendly.     

Graphical Presentations of Data Envelopment Analyses: Management Implications from Parallel Axes Representations*

The conversion of multivariate data analysis into information that managers can readily use in their decision making has always been a challenging task. In this paper we provide a parallel axis representation of multivariate data and demonstrate how this representation may be used as a tool for implementing the results of data envelopment analysis. We use an analysis of the efficiency of electricity generating plants to illustrate the technique.     

Solution Procedures for the Lot-Streaming Problem

Lot streaming is the process of splitting a job into sublots so its operations can be overlapped and its progress accelerated. We present a computationally efficient procedure for solving the m-machine, two-sublot problem, and we discuss the bottleneck insights that emerge from the analysis. We also examine heuristic approaches for more than two sublots and discuss computational results for these procedures.     

On a control chart for the Gini index with simulations

In this work we suggest the use of the Gini index on control charts. The asymptotic properties of Gini index are presented and the control charts based on appropriate confidence intervals are constructed. The suitability of the proposed charts are investigated by means of extensive simulations.     

关于渭河流域实施排污权交易制度的立法建议

从相关立法看,对渭河流域水污染的治理主要采取了传统的行政方式。为提高渭河水污染治理效率,促进陕西经济社会的可持续发展,有必要借鉴美国和我国上海、江苏等地比较成熟的做法,采用市场的方法即排污权交易来治理渭河流域水污染,这有利于促进企业技术革新,降低整个社会的治理成本,比单纯的行政方法更为迅速和有效。因此,应进行地方立法,规定可交易污染物的范围、排污权的初始分配方式、交易的程序等,以规范排污权交易市场;同时,确定渭河的环境容量总量以确定可供分配的指标,构建信息平台以降低交易费用及保障公民的知情权。     

论青年女性流动人口初育间隔与人口控制——来自厦门流动人口家庭问卷调查的启示

青年女性流动人口实际生育行为的控制对于人口规模与结构的控制,起着至关重要的作用。而生育时间的选择作为影响流动人口生育实践的一个重要因素,体现在对各孩次生育间隔的控制上。本文在描述分析的基础上,应用Cox比例风险模型,主要对厦门市青年女性流动人口初育间隔的影响因素进行估计和检验,并在总结分析的基础上对流动人口控制问题提出几点对策思考。     

Socially disadvantaged women's views of barriers to feeling safe to engage in decision-making in maternity care

BackgroundAlthough midwifery literature suggests that woman-centred care can improve the birthing experiences of women and birth outcomes for women and babies, recent research has identified challenges in supporting socially disadvantaged women to engage in decision-making regarding care options in order to attain a sense of control within their maternity care encounters.ObjectiveThe objective of this paper is to provide an understanding of the issues that affect the socially disadvantaged woman's ability to actively engage in decision-making processes relevant to her care.Research designThe qualitative approach known as Interpretative Phenomenological Analysis was used to gain an understanding of maternity care encounters as experienced by each of the following cohorts: socially disadvantaged women, registered midwives and student midwives. This paper focuses specifically on data from participating socially disadvantaged women that relate to the elements of woman-centred care-choice and control and their understandings of capacity to engage in their maternity care encounters.FindingsSocially disadvantaged women participants did not feel safe to engage in discussions regarding choice or to seek control within their maternity care encounters. Situations such as inadequate contextualised information, perceived risks in not conforming to routine procedures, and the actions and reactions of midwives when these women did seek choice or control resulted in a silent compliance. This response was interpreted as a consequence of women's decisions to accept responsibility for their baby's wellbeing by delegating health care decision-making to the health care professional.ConclusionThis research found that socially disadvantaged women want to engage in their care. However without adequate information and facilitation of choice by midwives, they believe they are outsiders to the maternity care culture and decision-making processes. Consequently, they delegate responsibility for maternity care choices to those who do belong; midwives. These findings suggest that midwives need to better communicate a valuing of the woman's participation in decision-making processes and to work with women so they do have a sense of belonging within the maternity care environment. Midwives need to ensure that socially disadvantaged women do feel safe about having a voice regarding their choices and find ways to give them a sense of control within their maternity care encounters.     

A Warning Zone Method for the Multiperiod Cost Variance Investigation Problem

This paper develops a warning zone approach to make variance investigation decisions for a multiperiod process. The assumed cost generation process varies between an in-control and out-of-control state. These states cannot be directly observed, but must be inferred from the reported cost variances. Using the warning zone method of inference, the manager investigates the process whenever an upper threshold is exceeded or a lower threshold is exceeded for two consecutive periods. A four-state Markov chain models the resulting decision process. Steady state probabilities are derived for this chain and are used to obtain explicit formulas for the effectiveness and efficiency of the decision process. These formulas permit computation of the cost savings attainable by the warning zone method. Compared to other decision rules, the warning zone method is much simpler than the theoretically optimal Bayesian revision method, but uses more information than the Markovian control limit method. Numerical comparison of results shows that the warning zone method usually captures most of the available cost savings, even in cases where the Markovian control limit method does not perform well.