In assessing the insulation withstand level of the electric apparatus, the step-up test method is used. However, we have still many unknown matters regarding the treatment of the results. In this paper, we assume that the underlying probability distribution of failure time with a constant voltage level follows a Weibull distribution and that an inverse power law relationship between the mean li...

This paper discusses the validity of methods of estimating long-term average cumulative aircraft noise exposure, measured in Lden, around the airport. Last year, Ministry of the Environment, Japanese Government, notified a revised guideline of "Environmental Quality Standard for aircraft noise," in which noise index for evaluating aircraft noise was changed from WECPNL to Lden. Now, in the guid...

A hospital-based case-control study of the association between past occupational exposure to asbestos and pleural mesothelioma was carried out in five regions of France. Between 1987 and 1993, 405 cases and 387 controls were interviewed. The job histories of these subjects were evaluated by a group of experts for exposure to asbestos fibers according to probability, intensity, and frequency. A ...

We conduct a panel analysis quantifying the degree to which the mixture of low-, middleand high-income males in the neighbourhood affect the subsequent labour income of individuals, and test the degree to which these effects vary by timing (lagging up to three years) duration (one to four years), and cumulative amount of exposure and to what extent these effects are persistent. We employ a fixe...

BACKGROUND Hypocarbia and hyperoxia are risk factors for periventricular leukomalacia in low birth weight infants. The association of a cumulative index of exposure to hypocarbia and hyperoxia and periventricular leukomalacia has not been evaluated. OBJECTIVE Our goal was to examine the relationship between cumulative index of exposure to hypocarbia and hyperoxia and periventricular leukomala...

OBJECTIVES The relation between lifetime cumulative exposure to asbestos, pathological grade of pulmonary fibrosis, and lung burden of asbestos at death, was explored in a necropsy population of former workers in a chrysotile asbestos textile plant in South Carolina. METHODS Estimates of cumulative, mean, and peak exposures to asbestos were available for 54 workers. Necropsy records and lung ...

BACKGROUND Urinary mercury (U-Hg) excretion is a commonly used biomarker for mercury exposure from dental amalgam restorations. OBJECTIVES Our goal was to determine the most efficient measure of dental amalgam exposure for use in analyses concerning U-Hg in children. METHODS We analyzed time-sensitive longitudinal amalgam exposure data in children randomized to amalgam restorations (n = 267...