Showing papers by "City University of Hong Kong published in 1990"

Optimism and the reporting of flu episodes

Abstract: This study examined the differences between dispositional optimists and pessimists in their reporting of ill health and health promoting behaviours for a stress related illness, namely influenza. The results revealed clear and consistent attentional biases of the dispositions as measured by the Life Orientation Test. While optimists and pessimists did not differ in stress levels or the number of incidences of flu, pessimists reported the duration as longer, a higher expectancy of flu in the future, and more symptoms and causes of stress that optimists. On the other hand, optimists reported greater engagement in health promoting behavior and more specific attempts at prevention of flu. These differences are discussed with regards to attentional style and affect and the implications for further research are outlined.

Hub-Centered Production Control of Wafer Fabrication

Abstract: This paper describes a flow rate control policy to manage the production of a wafer fabrication facility. The policy is derived by formulating and solving a stochastic control problem. The results are then used to develop two sets of production control rules. The first one adjusts the lot release by determining when and how many new lots should be started. The second one controls the re-entrant process in the photolithography area, commonly known as the hub. The control rules are robust against random disturbances because they provide a feedback control based on the information of the entire shop floor.