Directional mixture models and optimal estimation of the mixing density

The authors develop consistent nonparametric estimation techniques for the directional mixing density. Classical spherical harmonics are used to adapt Euclidean techniques to this directional environment. Minimax rates of convergence are obtained for rotation ally invariant densities verifying various smoothness conditions. It is found that the differences in smoothness between the Laplace, the Gaussian and the von Mises‐Fisher distributions lead to contrasting inferential conclusions.     

Unifying CRM and EWOC designs for phase I cancer clinical trials

The main goal of phase I cancer clinical trials is to determine the highest dose of a new therapy associated with an acceptable level of toxicity for the use in a subsequent phase II trial. The continual reassessment method (CRM) [O’Quigley, J., Pepe, M., Fisher, L., 1990. Continual reassessment method: a practical design for phase I clinical trials in cancer. Biometrics 46, 33–48] and escalation with overdose control (EWOC) [Babb, J., Rogatko, A., Zacks, S., 1998. Cancer phase I clinical trials: efficient dose escalation with overdose control. Statist. Med. 17 (10), 1103–1120] are two model-based designs used for phase I cancer clinical trials. A few modifications of the (original) CRM and EWOC have been made by many authors. In this paper, we show how CRM and EWOC can be unified and present a hybrid design. We study the characteristics of the approach of the hybrid design. The comparisons of the three designs (CRM, EWOC, and the hybrid design) are presented by convergence rates and overdose proportions. The simulation results show that the hybrid design generally has faster convergence rates than EWOC and smaller overdose proportions than CRM, especially when the true maximum tolerated dose (MTD) is above the mid-level of the dose range considered. The performance of these three designs is also evaluated in terms of sensitivity to outliers.     

The generalized two-sided power distribution

The generalized standard two-sided power (GTSP) distribution was mentioned only in passing by Kotz and van Dorp Beyond Beta, Other Continuous Families of Distributions with Bounded Support and Applications, World Scientific Press, Singapore, 2004. In this paper, we shall further investigate this three-parameter distribution by presenting some novel properties and use its more general form to contrast the chronology of developments of various authors on the two-parameter TSP distribution since its initial introduction. GTSP distributions allow for J-shaped forms of its pdf, whereas TSP distributions are limited to U-shaped and unimodal forms. Hence, GTSP distributions possess the same three distributional shapes as the classical beta distributions. A novel method and algorithm for the indirect elicitation of the two-power parameters of the GTSP distribution is developed. We present a Project Evaluation Review Technique example that utilizes this algorithm and demonstrates the benefit of separate powers for the two branches of activity GTSP distributions for project completion time uncertainty estimation.     

求解已知月首干支的甲骨卜辞的的绝对年代

将具有月龄特征的历谱规律的研究成果用于求解相关甲骨卜辞的年代间隔,本文首次详细推得十三版已知月首干支的甲骨卜辞的绝对年代及其历日.     

国内语言焦虑与大学英语学习研究述评

在国外,对语言焦虑的研究起步较早,成果也较多。然而国内此类研究主要始于2000年,虽然短短的几年,但所发表的论文很多。作者仅从语言焦虑对听说读写的作用以及与英语学习成绩相关性两个角度,对国内学者发表于国内各种刊物上的调查报告和实证研究进行综述,在指出这些研究不足之处的同时提出今后研究的建议,最后简要探讨了焦虑研究对英语教学的启示。     

港口设施建设的多元化筹资方式研究

研究我国港口设施筹资模式对促进我国港口的发展有着重大的现实意义.本文由四个部分组成,从我国港口的现行筹资模式入手进行分析,找出港口设施现行筹资模式的局限性,结合我国港口实际情况对其现行筹资模式进行创新,并在此基础上总结出我国港口设施筹资模式改革的几点启示.     

网络时代馆际互借模式之研究

馆际互借、资源共享的观念在我国已推行多年 ,由于图书馆自动化系统及网络系统的不断发展 ,网络时代的资源共享和馆际互借成了当前一个非常重要的课题。现代图书馆必须利用各种信息资源 ,达成馆际互借资源共享的目的。世界各国图书馆都在探讨馆际互借的模式 ,并且提出了各种方案 ,加以实践和探索。由于各国或地区情况的多样性 ,各种馆际互借的方式也不相同。本文主要探讨了美国、英国、德国、日本及中国香港、台湾地区馆际互借的模式 ,建设性地提出了我国馆际互借资源共享发展的趋势     

延安产业发展中自然资源利用状况研究

改革开放以来 ,延安产业在发展过程中 ,过份依赖于石油资源的开发 ,忽略了具有相对比较优势的土地资源的开发利用 ,因此 ,没有能够利用丰富的土地资源发展具有地区优势的特色农产品及其相应的加工工业 ,形成了单一化的石油经济 ,导致了经济发展中结构性矛盾突出 ,生态环境问题严重 ,经济整体效益低 ,影响着经济发展质量和可持续性发展。     

有关股评价值的实证研究

以2000年股评家推荐的2052只股票作为样本,并根据推荐的持有策略将其分成短线和中线两组来分析股评的投资价值.研究结果对我国股评家属于信息驱动型提出了质疑,并指出,即使考虑交易费用,被推荐的短、中线个股(组合)仍然具有一定的投资价值.从长期来看,个股(组合)可以显著获得超常收益或赢利;与中线相比,短线个股(组合)的期望收益较高、风险较小.     

企业拖欠银行债务行为的博弈分析

当前,企业以各种形式拖欠银行债务现象较为普遍,这直接影响着我国宏观国民经济的健康发展。该文运用经济学中博弈论的相关知识对这一现象进行了剖析,从政府职能转变、国有商业银行产权改革等几方面提出了防范企业拖欠银行债务的对策及建议。