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271.
An increasing barrier to productivity in knowledge‐intensive work environments is interruptions. Interruptions stop the current job and can induce forgetting in the worker. The induced forgetting can cause re‐work; to complete the interrupted job, additional effort and time is required to return to the same level of job‐specific knowledge the worker had attained prior to the interruption. This research employs primary observational and process data gathered from a hospital radiology department as inputs into a discrete‐event simulation model to estimate the effect of interruptions, forgetting, and re‐work. To help mitigate the effects of interruption‐induced re‐work, we introduce and test the operational policy of sequestering, where some service resources are protected from interruptions. We find that sequestering can improve the overall productivity and cost performance of the system under certain circumstances. We conclude that research examining knowledge‐intensive operations should explicitly consider interruptions and the forgetting rate of the system's human workers or models will overestimate the system's productivity and underestimate its costs. 相似文献
272.
Research suggests an association between risk perception and risk-taking behavior in a variety of contexts. There is empirical
evidence that perceived risk is generally biased and that perception of risk influences behavior. Perception of risk can be
endogenous. It is therefore more appropriate to instrument risk perception. This article studies the perception of the risks
associated with impaired driving and the relation between predicted risk perception and driving behavior. We survey a sample
of license-holders, half of whom are drivers with a past conviction for impaired driving, the other half or control group
without such conviction. Predicted perceptual biases are shown to influence actual driving behavior.
相似文献
Georges DionneEmail: |
273.
For the first time, we provide a matrix formula for second-order covariances of maximum likelihood estimates in heteroskedastic generalized linear models, thus generalizing the results of Cordeiro (2004) and Cordeiro et al. (2006) related to the generalized linear models with known and unknown dispersion parameter, respectively. The covariance matrix formula does not involve cumulants of log-likelihood derivatives and can be easily obtained using simple matrix operations. We apply our main result to a simple model. Some simulations show that the second-order covariances can be quite pronounced in small to moderate samples. The usual covariances of the maximum likelihood estimates can be corrected by these second-order covariances. 相似文献
274.
275.
Past research has examined the relative impact of family and peers on adolescent behavior, but very little research has examined it in relation to youth dating violence. Eight hundred and sixty-five adolescents, primarily urban Latino youth, completed self-administered surveys at school. Multivariate analyses indicated that exposure to prior family violence was not significantly associated with adolescents' aggressive expression of anger or their acceptance of cross-gender aggression. However, current conflict--either family or peer--was associated with adolescent behavior and attitudes, with the exception that current peer conflict was not significantly associated with adolescents' acceptance of male on female aggression. Parental monitoring and attachment were not found to be moderators of these relationships. Implications for dating violence interventions and future directions for research are explored. 相似文献