The Journal of Science of Labour
Online ISSN : 2187-2570
Print ISSN : 0022-443X
Volume 87 , Issue 4
Showing 1-3 articles out of 3 articles from the selected issue
Original Articles
  • Hideki OYAMA, Kazuya SUZUKI, Kazuhiro SAKAI
    2011 Volume 87 Issue 4 Pages 121-135
    Published: 2011
    Released: March 25, 2013
    The purpose of this study was to examine cases of increased fatigue and related factors in 103 long-haul truck drivers. The results showed that about 40 percent of long-haul truck drivers experienced fatigue due to work. The following factors were found to be significantly related to increased fatigue : (1) long driving hours, sleep deprivation, lack of holidays, lack of rest periods and naps between drives, time-related pressure, and work load ; (2) dissatisfaction with company equipment and sleeping conditions in the truck’s cabin ; (3) dissatisfaction with performance-based pay ; (4) poor health ; and (5) lack of vegetables, deviation of meals, erratic eating habits, and lack of exercise as aspects of the individuals lifestyle. The results analyzed through structural equation modeling showed that sleeping conditions had a direct influence on the degree of fatigue and health states. Further, driving conditions and organizational conditions as background factors were found to have an indirect influence on the work-related fatigue and health states.
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Field Reports
  • Naoki TOYAMA
    2011 Volume 87 Issue 4 Pages 136-156
    Published: 2011
    Released: March 25, 2013
    It is important to take proper and rational countermeasures to prevent asbestos exposures of the public from existing asbestos-containing materials. The first important step towards an effective asbestos control is the implementation of an appropriate analytical method for asbestos-containing materials. In Japan, the JIS A 1481 method has been the only legallyacceptable asbestos analysis method since 2006. The JIS method uses a combination of X-ray diffractometry (XRD) and dispersion-staining phase contrast microscopy (DS-PCM) to analyze bulk samples of suspect asbestos-containing materials. The JIS approach is completely different from the ISO/DIS22262-2 analytical method, which is soon to be the international standard for asbestos analyses. Unfortunately, the JIS analytical methodology has repeatedly raised concerns about the accuracy of the analysis based on the JIS method. This study reviews the different definitions of asbestos used in both the JIS and ISO analytical methods ; compares the respective effectiveness of each analytical method ; and, discusses the accuracy of the JIS method in comparison with that of the ISO method. The JIS method has possibility to lead to analytical results different from those of the ISO method because of the difference in the definition of asbestos and in analytical methods.
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  • Toru KIMURA
    2011 Volume 87 Issue 4 Pages 157-168
    Published: 2011
    Released: March 25, 2013
    An investigation of job satisfaction was conducted by administering a questionnaire to about 1800 white-collar workers at 70 companies. The business performance of the companies as measured by the operating profit ratio in three different periods, before, during and after the survey, was ascertained based on published information. To avoid the influence of business fluctuations and exchange rates, the companies were classified in three groups, machinery, chemical and pharmaceutical, and the correlation coefficient between job satisfaction and the operating profit ratio was calculated for each industry.
    The results of data analysis revealed that job satisfaction was significantly correlated with the operating profit ratio both during and after the survey period. However, job satisfaction was not correlated with the profit ratio before the survey. These findings suggest that job satisfaction is not the result of the business performance, and that higher job satisfaction results in improved organizational performance.
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