基于虚拟现实的人机工程MTM和NIOSH方法研究

人机工程学是按照人的特性设计和改善人-机-环境系统的科学,虚拟现实技术近年来发展迅速,其逼真模拟特性可作为人机工程模拟研究法的一个有效手段.该文研究了虚拟现实技术在人机工程中的应用,使用虚拟现实软件对工人的作业进行了仿真,利用MTM方法-时间测定和NIOSH举起分析功能,研究了工人在冲床上加工零件的方法-时间测定及手推车的人机工程设计.     

Changes in the protein kinase C activity or rat sternomastoid muscle during development and after denervation

The relationship between the activity of protein kinase C (PKC) and muscle innervation was explored in the rat sternomastoid muscle (SM) from day 18 of gestation (E18) to adult age. Between E18 and birth, PKC activity rose 5-fold, and during the day after birth, diminished to a level characteristic of the mature muscle. The rise chiefly occurred in the neural part of the muscle, in both the membrane and the cytosol fractions. Between E18 and day 5 after birth, the ratios of membrane to cytosol PKC activity rose from 0.5 to 10 and 3 respectively in the neural and aneural parts of the muscle. Denervation of adult SM reduced PKC activity by half in the membrane fraction of the neural part but did not significantly change it in the membrane or cytosol fractions of the aneural parts. These results suggest that innervation plays an important part in determining the level of PKC activity in muscle.