Coordinated deterministic dynamic demand lot-sizing problem: A review of models and algorithms

Due to their importance in industry and mathematical complexity, dynamic demand lot-sizing problems are frequently studied. In this article, we consider coordinated lot-size problems, their variants and exact and heuristic solutions approaches. The problem class provides a comprehensive approach for representing single and multiple items, coordinated and uncoordinated setup cost structures, and capacitated and uncapacitated problem characteristics. While efficient solution approaches have eluded researchers, recent advances in problem formulation and algorithms are enabling large-scale problems to be effectively solved. This paper updates a 1988 review of the coordinated lot-sizing problem and complements recent reviews on the single-item lot-sizing problem and the capacitated lot-sizing problem. It provides a state-of-the-art review of the research and future research projections. It is a starting point for anyone conducting research in the deterministic dynamic demand lot-sizing field.     

Leisure-time physical activity and health-care utilization in older adults

This study examined whether leisure-time physical activity (LTPA) was associated with health-care utilization in a racially diverse sample of rural and urban older adults. Community-dwelling adults (N = 1,000, 75.32 +/- 6.72 years old) self-reported participating in LTPA and their use of the health-care system (physician visits, number and length of hospitalizations, and emergency-room visits). After controlling for variables associated with health and health-care utilization, older adults who reported lower levels of LTPA also reported a greater number of nights in the hospital in the preceding year. There was no support, however, for a relationship between LTPA and the other indicators of health-care utilization. Our findings suggest that being physically active might translate to a quicker recovery for older adults who are hospitalized. Being physically active might not only have health benefits for older persons but also lead to lower health-care costs.     

Touch,compliance, and interpersonal affect

This study investigated the effects of touch on compliance to a help request. The experimenter's initiation of touch during the request did increase compliance as measured by time spent scoring bogus personality inventories. The hypothesized role of attraction in mediating the touch-compliance link was not supported. Instead, touch may have served to indicate status or power differences that influenced subjects to comply. A sex of subject × sex of experimenter interaction was manifested in female subjects complying more to female experimenters than did subjects in any other sex pairing.The authors would like to thank James Daly and Kay McIntyre for their help in conducting this study. Completion of this project was supported by Weldon Spring Research Grant from the University of Missouri to the first author.     

Application of wavelets to the pre-processing of underwater sounds

In this paper we consider data on underwater sounds of differing types. Our objective is to filter background noise and achieve an acceptable level of reduction in the raw data, whilst at the same time maintaining the main features of the original signal. In particular, we consider data compression through the use of wavelet analysis followed by a thresholding of small coefficients in the resulting multiresolution decomposition. Various methods to threshold the wavelet representation are discussed and compared using recordings of dolphin sounds. An empirical modification to one of them is also proposed which shows promise in better preserving certain structures in our particular sound data.     

The Forgotten Anniversary? An Examination of the 1944 White Paper, “A National Health Service”

The 1944 Wartime Coalition White Paper, “A National Health Service”is unlikely to be celebrated among the spate of golden anniversaries of welfare reforms in the 1990s. However, a study of this document may be of interest for two main reasons. First, it has some parallels with the reformed National Health National Health Service of the 1990s and, second, there have been recent calls for a local government-based health service, as was envisaged in 1944. The White Paper is examined in the context of evolving plans for the NHS, and is compared with the actual shape of the NHS as introduced by the Labour Minister of Health, Aneurin Bevan, in 1948. Four themes are drawn out. First, the White Paper should not be seen as the embodiment of a political consensus. Second, a Conservative Health Service would have differed from the NHS in fundamental aspects. Third, the conceptual advantages of a local government-based health service were out-weighed by practical politics. Fourth, although the Labour Party made a difference to the shape of the NHS, that shape did not simply follow from party policy. This implies that medical pressure was successful, to some extent, in defining the limits of the new service.     

Health Authorities, Priority-setting and Resource Allocation: A Study in Decision-making in New Labour's NHS

This paper analyses the decision‐making process of health authorities under New Labour in the NHS through a study of their qualitative responses to questionnaires. We find a considerable frustration and cynicism with the government's plans for reform, with its interference at the local level with services, and an acknowledgement of the differences between health authorities’ practice and what they believe the government requires, with, often, only minimal effort being made attempting to achieve new governmental performance targets. We conclude by making suggestions for an alternative strategy less likely to antagonize local health service providers.     

Limousine Liberals and Corporate Conservatives: The Financial Constituencies of the Democratic and Republican Parties*

Objective. This study examines the backgrounds, political attitudes, issue preferences, and political participation of congressional donors who contribute $200 or more to congressional campaigns. Methods. We use a nationwide survey of more than 1,000 donors and analyze differences among these individuals using cluster analysis. Results. Although these significant donors are economic elites, we find they are not monolithic in their political views and attitudes. There are significant cleavages in the donor pool across and within the two major parties on various political issues and involvement in different political organizations. Perhaps most important, we find that the most active donors hold the most ideologically extreme political views. Conclusions. The results suggest that the sharp cross‐party differences and the meaningful variations within party coalitions, combined with the greater activity of more ideologically extreme donors, contribute to and reflect party polarization.