In virtual manufacturing environment, MOD method is applied to complete work measurement and obtain standard time, which breaks through the traditional areas of application in realistic manufacturing system.

This paper discusses the content and effect of work measurement(WM)technology,points out the existing problems when WM technology is employed to shape standard time.

To track the standard time and the resources which including the labor and machin- ery of the main activities in high-rise housing so that it could be used to analyze the construction schedule, the development of this study is based on work-time.

Value appraisal scale of file,which should be held in ckecking operation,was discussed from aspects of pragmatic value,perservation expenses and time standard etc.

A guarantee system for unified time standard and qualified time service technique is essential for an independent country.

On the basis of analyzing the legal obligation of reasonable dispatch to be undertaken by the carrier of marine goods, this article suggests that the reasonable time shall be regarded as a time criterion of defining delay in delivery under Maritime Code of PRC in absence of agreement about the time of cargo delivery under the contract of carriage.

Selection on degasification temperature and observation time of radon observation sample;

To solve the contradiction between target tracking accuracy and observation interval,an algorithm of calculating observation time based on target estimate covariance control was presented.