浅谈优秀多媒体教学课件的设计与制作

本文根据认知理论对当前多媒体课件设计中存在的问题及原因进行了剖析,重点讨论了课件设计创作应遵循的基本原则,以及在课件设计中应注意的基本环节及制作步骤。     

Housing Policy and the Elderly

Subsidized senior high-rise apartments have tended to neglect the needs of an increasingly aged and frail resident population. Research demonstrates that this population has greater unmet needs than elderly who reside in traditional community housing. This paper makes the case for enriched senior high-rise apartments as a viable alternative for elders who need assistance in order to maintain an independent lifestyle.     

A Retrial Queue with a Constant Retrial Rate,Server Downs and Impatient Customers

ABSTRACT

In this paper, we consider a retrial queueing system consisting of a waiting line of infinite capacity in front of a single server subject to breakdowns. A customer upon arrival may join the queue (waiting line) or go to the retrial orbit (another queue) to retry for service after a random time. Only the customer at the head of the retrial orbit is allowed to retry for service. Upon retrial, the customer enters the service if the server is idle; otherwise, it may go back to the retrial orbit or leave the system (become impatient). All the interarrival times, service times, server up times, server down times and retrial times are exponential, and all the necessary independence conditions in these variables are assumed. For this system, we provide sufficient conditions under which, for any given number of customers in the orbit, the stationary probability of the number of customers in the waiting line decays geometrically. We also provide explicitly an expression for the decay parameter.     

Bounding the resampling risk for sequential Monte Carlo implementation of hypothesis tests

Sequential designs can be used to save computation time in implementing Monte Carlo hypothesis tests. The motivation is to stop resampling if the early resamples provide enough information on the significance of the p-value of the original Monte Carlo test. In this paper, we consider a sequential design called the B-value design proposed by Lan and Wittes and construct the sequential design bounding the resampling risk, the probability that the accept/reject decision is different from the decision from complete enumeration. For the B-value design whose exact implementation can be done by using the algorithm proposed in Fay, Kim and Hachey, we first compare the expected resample size for different designs with comparable resampling risk. We show that the B-value design has considerable savings in expected resample size compared to a fixed resample or simple curtailed design, and comparable expected resample size to the iterative push out design of Fay and Follmann. The B-value design is more practical than the iterative push out design in that it is tractable even for small values of resampling risk, which was a challenge with the iterative push out design. We also propose an approximate B-value design that can be constructed without using a specially developed software and provides analytic insights on the choice of parameter values in constructing the exact B-value design.     

PVT筒中气液两相非平衡过程的数值模拟

目前国内外多采用平衡后各组分逸度系数相等的平衡判据来描述两相中各个组分的分配情况，但该法无法进行两相由非平衡初始状态达到平衡状态这一非平衡热力学过程的研究。针对这一问题，提出了引入扩散方程来描述液相和气相各个组分由接触到稳定过程的方法，建立了描述两相非平衡态扩散过程的数学模型，提出了分阶段求解模型的求解算法，并运用该法对PVT筒中气液两相系统由接触到稳定过程的状态进行了分析，得出系统全程压力变化规律及平衡状态下随高度变化的甲烷浓度分布规律。计算结果与实验数据对比验证了该方法的可行性，从而为非平衡态相变问题的分析提供了新的思路。     

Inference for Time Series Regression Models With Weakly Dependent and Heteroscedastic Errors

Motivated by the need to assess the significance of the trend in some macroeconomic series, this article considers inference of a parameter in parametric trend functions when the errors exhibit certain degrees of nonstationarity with changing unconditional variances. We adopt the recently developed self-normalized approach to avoid the difficulty involved in the estimation of the asymptotic variance of the ordinary least-square estimator. The limiting distribution of the self-normalized quantity is nonpivotal but can be consistently approximated by using the wild bootstrap, which is not consistent in general without studentization. Numerical simulation demonstrates favorable coverage properties of the proposed method in comparison with alternative ones. The U.S. nominal wages series is analyzed to illustrate the finite sample performance. Some technical details are included in the online supplemental material.     

大坡度条件下T梁单导梁架桥机的改装设计与应用

针对大坡度桥梁预制梁架设,以阿尔及利亚东西高速公路(中段)18公里桥为例,在原有架桥机基础上进行了改装设计,并采取其它工程措施保证了架梁的速度、质量和安全,使大坡度T梁架设工作得以顺利完成。     

Evolving Management Structures:

No abstract available for this article.     

A Fit Person to Run a Home: Registered Homes Tribunal Interpretations of the ‘Fit Person’ Concept in the United Kingdom

ABSTRACT

The abuse of people living in residential care in the UK is well documented. A further wealth of information is available in the form of anecdotal accounts of those who have been employed in this sector but who, in a climate which is still somewhat hostile to ‘whistle blowers,’ are not prepared to formally report their concerns. A small but significant amount of hard evidence of abuse exists in the reports of the Registered Homes Tribunal decisions. This body has the jurisdiction to hear appeals concerning the running of registered and nursing homes in the UK. The circumstances portrayed range from issues of ‘bad practice’ to abuse which may be physical, psychological, or sexual, perpetrated by staff, home owners, residents, or visitors. Many of the cases which concern the tribunal focus on whether a given individual is a ‘fit person’ to run a home. It is the aim of this article to consider and reflect on the tribunals’ interpretation of that term, in relation to the operation and decisions of the tribunal.     

Sri Lanka: an exploration of the systemic erosion of stability

Abstract

In Sri Lanka tremendous expertise is employed in thinking and manoeuvring around the personalities that shape the outcomes that beset the country. Such expertise is the bread and butter of the political and business circles, which is equally well reflected in the media and realistically respected in the NGO and international circuit.

What is disconcerting however is the almost oblivious attention paid to matters of structure and functionality. Yet Sri Lanka is rife with structural and functional anomalies, which is positioned to terminally gnaw at advantages gained by changes in governments, peace talks, poverty reduction, etc. Using the example of the Public Administration System and the democratically elected Presidential and Parliamentary process explained is the structural and functional impediments that are crying out for serious remedy.

There is a vital homeostatic balance that is exercised between the parliament and the Public Administration System as a result of the former being elected and the latter employed on tenure. This translates to the Public Administration System being able to afford to think long term (since their tenure is secure) whilst being tempered by parliament's shorter range thinking occasioned by the politician's need to show results to entice its next bout of votes. In essence, this twofold structure serves to foster the seeking of a homeostatic balance between the long-and short-term needs of the country.

In Sri Lanka by constitutional and other legislative enactments various homeostatic relationships between races, languages, time spans etc. have been (un)wittingly flouted. These aspects are diagnosed using the cybernetic concepts of homeostasis and ultrastability.