Locally optimal designs for the simple death process

We demonstrate the existence and uniqueness of optimal observation schedules for discrete observation of the simple death process. Optimality is framed in the sense of observing the process at times that maximise the Fisher information for the death rate. We examine the relationship of our designs with those obtained by other authors for the simple birth process. A number of interesting properties are uncovered. Practical considerations in the application of these designs in an experimental setting are investigated, and we examine the performance of some approximately optimal designs that are usually simpler to implement. We will show that our optimal designs are highly robust to mis-specification of the death rate.     

基于价值链视角的MBA教育创新思考

中国的企业要提升竞争力．需要的是工商管理硕士这类既有知识又有实践经验的稀缺性人力资源。MBA教育作为这种资源的供应商，扮演了重要的价值创造角色，肩负着为中国发展培养高素质经营管理人才的历史重任。身份象征、知识结构改善、职业目标实现及扩展人脉等MBA的价值通过其价值活动得以实现。为了进一步提升MBA教育的竞争力，需要对MBA进行价值创新。通过减少教育产业竞争所比拼的元素，采用最适合中国文化的教育模式节省成本；再通过增加和创造产业未曾提供的元素,优化整个的MBA教育从而提升了买方价值。这两种行为的交汇点便实现了MBA价值创新。     

Sexual Minority Adolescents

Abstract

Most ethical dilemmas confronting professional school counselors (PSCs) do not involve simple solutions. Therefore, to practice ethically, PSCs need to possess and have the ability to articulate their ethical decision-making process with a clear and defendable professional explanation. Specifically, this article details the ethical decision-making process for PSCs working with lesbian, gay, bisexual, and transgendered (LGBT) adolescents. Additionally, ethical standards and legal statutes relating to counseling LGBT adolescents, ethical decision-making processes, and implications are discussed.     

随机过程的概念解析

通过分析Bernoulli试验对应的随机变量序列,给出随机过程的直观定义导致的矛盾.借助测度论的基本概念系统,解析随机过程的数学定义,给出随机过程样本函数与随机过程实现的概念一致性.     

Bayesian discrete latent spatial modeling of crack initiation in orthopaedic hip replacement bone cement

In this paper, we propose a spatial model for the initiation of cracks in the bone cement of hip replacement specimens. The failure of hip replacements can be attributed mainly to damage accumulation, consisting of crack initiation and growth, occurring in the cement mantle that interlocks the hip prosthesis and the femur bone. Since crack initiation is an important factor in determining the lifetime of a replacement, the understanding of the reasons for crack initiation is vital in attempting to prolong the life of the hip replacement. The data consist of crack location coordinates from five laboratory experimental models, together with stress measurements. It is known that stress plays a major role in the initiation of cracks, and it is also known that other unmeasurable factors such as air bubbles (pores) in the cement mantle are also influential. We propose an identity-link spatial Poisson regression model for the counts of cracks in discrete regions of the cement, incorporating both the measured (stress), and through a latent process, any unmeasured factors (possibly pores) that may be influential. All analysis is carried out in a Bayesian framework, allowing for the inclusion of prior information obtained from engineers, and parameter estimation for the model is done via Markov chain Monte Carlo techniques.     

石油企业自主创新联盟的影响因素分析

资源及能力的有限性使得企业在自主创新过程中将面临巨大的风险,而自主创新联盟有助于企业通过知识、技术等资源的互补实现关键技术的突破,以达到共赢。故以石油企业为例,在定性分析的基础上,提出影响石油企业自主创新联盟的主要因素,通过因子分析及信度检验,认为利益、风险、伙伴关系、行业环境及潜在能力是影响石油企业自主创新联盟的主要因素。     

Global convergence of the log-concave MLE when the true distribution is geometric

Let X₁, …, X_n be i.i.d. from a discrete probability mass function (pmf) p. In Balabdaoui et al. [(2013), ‘Asymptotic Distribution of the Discrete Log-Concave mle and Some Applications’, JRSS-B, in press], the pointwise limit distribution of the log-concave maximum-likelihood estimator (MLE) was derived in both the well- and misspecified settings. In the well-specified setting, the geometric distribution was excluded, classified as being degenerate. In this article, we establish the global asymptotic theory of the log-concave MLE of a geometric pmf in all ?_q distances for q∈{1, 2, …}∪{∞}. We also show how these asymptotic results could be used in testing whether a pmf is geometric.     

Asymptotics of the Finite-time Ruin Probability for the Sparre Andersen Risk Model Perturbed by an Inflated Stationary Chi-process

In this article, we consider the Sparre Andersen risk model that is perturbed by an inflated chi-process with non-negative random inflator R. Under some conditions on the perturbation and the random inflator, which allow for both small and large fluctuations, exact asymptotic behaviour of the finite-time ruin probability is obtained when initial reserve tends to infinity.     

基于顾客社区的创新模式研究——以Cspace顾客社区为例

以价值共创理论为基础，对企业如何通过顾客社区与顾客共同开展创新活动问题进行深入研究。首先，基于价值共创理论和价值链模型，构建顾客社区创新模式的理论框架；其次，通过对现有顾客社区的研究成果加以分类解析，提出顾客社区创新模式的理论命题；第三，以Cspace及旗下顾客社区为研究对象，对命题加以验证；最后，总结基于顾客社区的企业创新模式的价值链模型。     

A single-featured EWMA-X control chart for detecting shifts in process mean and standard deviation

The combined EWMA-X chart is a commonly used tool for monitoring both large and small process shifts. However, this chart requires calculating and monitoring two statistics along with two sets of control limits. Thus, this study develops a single-featured EWMA-X (called SFEWMA-X) control chart which has the ability to simultaneously monitor both large and small process shifts using only one set of statistic and control limits. The proposed SFEWMA-X chart is further extended to monitoring the shifts in process standard deviation. A set of simulated data are used to demonstrate the proposed chart's superior performance in terms of average run length compared with that of the traditional charts. The experimental examples also show that the SFEWMA-X chart is neater and easier to visually interpret than the original EWMA-X chart.