Search based job scheduling and sequencing with setup times

The problem of sequencing jobs on a machine in a job shop has been approached by a number of researchers and practitioners. One of the most popular methods is to apply a priority rule to the queue at each machine. The authors have previously published details of an approach which sets the priority of a job as a linear combination of the operation times and due date for that job. The coefficients in the linear combination are set by a simulation and search procedure so as to give good performance based on the performance measure specified. This paper extends this approach to include setup time factors. This extended approach is then applied to data from an actual manufacturing system. The extended approach is shown to improve the performance of the manufacturing system in relation to existing techniques.     

A Poorly Understood Condition: Disability Living Allowance and People with CFS/ME

This paper questions the adequacy of administrative responses to poorly understood disabling conditions in the UK. An illustrative case study, the administration of the Disability Living Allowance (DLA) to people with chronic fatigue syndrome or myalgic encephalomyelitis (CFS/ME), is examined. Controversies surrounding CFS/ME and institutional responses to the condition are summarized. The history and purposes of DLA are outlined, and research evaluating its administration and impact is reviewed. Quantitative data from the DSS are combined with qualitative data obtained from interviews with claimants and non-claimants of DLA with CFS/ME and with benefits advisers. Additional data from a national survey of people with CFS/ME are incorporated into the analysis. The findings show how the adjudication of DLA is particularly problematic in relation to people with CFS/ME. Decisions are likely to be based on inadequate evidence. These and other relevant findings are discussed in the context of the stigma attached to CFS/ME and other poorly understood disabling conditions, and socio–legal research and theory.     

Management Policies to Improve the Effectiveness of Multi-Station Service Organizations*

A SLAM based simulation model of a multi-station, tandem queuing structure characteristic of a variety of service systems is employed to test various design options for the system. The model is based on an extensive study of the State of Florida driver licensing offices. The multiple objectives of low time in the system for customers and the efficient use of personnel resources are employed to measure the benefits of policy options. The use of simulation analysis permits the incorporation of complex system characteristics, therefore providing a realistic representation of the effects of possible management actions. Effective methods to control labor in such systems are suggested.