Efficiency and robustness of hogg’s adaptive trimmed means

The adaptive trimmed means of Hogg (1974) and modified by De Wet and van Wvk (1978) are studied in this paper for finite samples. They are shown to have good intervals and afficiency Properties for Sample sizes 20 and larger Confidence intervals pased on these estimator are also considered and found to be fairly ro-bust for sample sizes 40 and larger.     

Design requirements for health care production control systems

This paper addresses the issue of determining design requirements for production control in health care organizations, with a restriction to the internal production control of hospitals. Hospital management has limited possibilities to control hospital production, as hospital production processes are driven by medical specialists who, however, do not manage that process. We consider therefore the hospital as a virtual organization, consisting of a number of relatively independent businesses in a common framework. Each business unit functions as a focused factory for a range of more or less homogeneous products. Production control principles can be applied to each of these businesses, but not to the system as a whole. A number of elements from classical production control theory can be also applied to health care, i.e. the use of decoupling points, the bottleneck-oriented approach, and the operational control between production and market. However, important factors that need to be considered in health production control are that often specifications on quality are not available at the start of the process, and that there is strong interaction between the patient and the process. Our conclusion is that a dedicated framework for approaching hospital production control is necessary. The specific characteristics of hospital care and its state of production control development are the main arguments for this dedicated framework.     

An investigation of order release and flow time allowance policies for assembly job shops

The effects of a number of essentially different work order release and flow time allowance policies on the assembly order flow times and assembly order due date performance are investigated. Work orders within an assembly order have different routing length. The assembly order flow time is the time that elapses between the release of the first work order and the completion of the last work order of the assembly order. The timing of the release of work orders, and the distribution of the flow time allowance over the work orders in an assembly order were varied, and used systematic computer simulation to investigate the effects on performance. The results show that the best performance is obtained with simultaneous work order release, an average operation flow time allowance equal to the average operation waiting time and equalized flow time allowances per work order in an assembly order.     

Educational Differences in Adolescents' Sexual Health: A Pervasive Phenomenon in a National Dutch Sample

Educational level is strongly associated with age of first intercourse and risk of unintended pregnancies. This study examined these associations in a large representative sample of Dutch adolescents and also included associations of educational level with other sexual health aspects. Adolescents aged 12 to 25 (3,926 boys and 3,915 girls) completed an online questionnaire that included measures of romantic and sexual experience; the evaluation of their sexual debut; the risk of sexually transmitted infections (STIs) and pregnancy; and sexual attitudes, satisfaction, self-efficacy, knowledge, victimization, and functioning. The results showed that adolescents on a vocational track or who completed fewer years of education were more at risk of several adverse sexual health outcomes than adolescents on an academic track. They had their first sexual experiences at an earlier age; evaluated these experiences less favorably; had less sexual health knowledge and fewer refusal skills; and had a higher risk of unintended pregnancy, STIs, and victimization. Possible explanations for these consistent differences are discussed. Sex education and services should pay specific and targeted attention to less educated young people and tailor their efforts specifically to the needs, characteristics, and realities of this group.     

再论蒙古与吐蕃和吐蕃佛教的初期接触

本文依据史料 ,对蒙古与吐蕃和吐蕃佛教初期接触的年代、事件进行了辨证。     

New Ways to Promote Proenvironmental Behavior: Expanding and Evaluating Motives for Environmentally Responsible Behavior

This article contends that while striving to promote environmentallyresponsible behavior, we have focused attention too narrowly on just two classes of motives. There is a need to expand the range of motives available to practitioners and to provide a framework within which motives can be evaluated for both their immediate and long-term effectiveness. The article then examines a strategy for promoting environmentally responsible behavior that has significant potential. This strategy is based on a particular form of motivation called intrinsic satisfaction. Nine studies are reviewed that have outlined the structure of intrinsic satisfaction. A key theme discussed is the human inclination for competence. This fundamental human concern is shown to have both a general form and a resource-specific version.     

Sequential assignment and treatment-as-usual. Alternatives to standard experimental designs in field studies of treatment efficacy.

Psychosocial treatment research studies encounter obstacles to random assignment (RA). Used together, two procedures offer an alternative to the standard RA design. First, sequential assignment (SA) may create less opposition from administration, staff, and clients. SA operates on the principle that limited bed availability, a common treatment consideration in the field, determines assignment of clients to conditions. Second, treatment-as-usual (TAU) represents an alternative type of control condition. Some clients on the waiting list will, before a slot opens up and they enter an experimental condition, be absorbed into the existing treatment system, in which the amount and type of treatment they receive can vary widely. Substituting SA and TAU for the standard RA design may introduce methodological impurities including certain limited biases.     

中国文化与民族心理的现状与未来

本文是中国人传统民族文化与心理特征的续篇 ,叙述现代中国人社会文化与心理特征的发展态势 ,社会根源 ,参照国外华人社会的共同价值观 ,预测 2 1世纪中国人社会文化与心理特征的塑造与发展前景